技术领域technical field
本实用新型实施例涉及电力电子技术，尤其涉及一种电源保护电路、电源电路和电路板。The embodiment of the utility model relates to power electronics technology, in particular to a power supply protection circuit, a power supply circuit and a circuit board.
背景技术Background technique
一般的，可以使用专用芯片来实现开关电源的设计，该专用芯片可以用于功率参数控制或者LLC谐振电路控制等。但是发明人在实现本实用新型的过程中，发现现有技术存在如下技术缺陷：一般的，为专用芯片提供电源保证专用芯片正常工作，但若专用芯片短路，容易造成电源对地短路。通常做法是在一路电源中增加限流电阻，但是限流电阻过大还会影响到专用芯片的输出驱动能力，导致输出波形失真的问题。Generally, a dedicated chip can be used to implement the design of the switching power supply, and the dedicated chip can be used for power parameter control or LLC resonant circuit control. However, in the process of realizing the utility model, the inventor finds that the prior art has the following technical defects: generally, the dedicated chip is provided with power to ensure the normal operation of the dedicated chip, but if the dedicated chip is short-circuited, it is easy to cause a short circuit between the power supply and the ground. The usual practice is to add a current-limiting resistor to one power supply, but if the current-limiting resistor is too large, it will also affect the output drive capability of the dedicated chip, resulting in the problem of output waveform distortion.
实用新型内容Utility model content
本实用新型提供一种电源保护电路、电源电路和电路板，以在不影响芯片驱动能力的前提下实现防止出现电源对地短路的技术效果。The utility model provides a power supply protection circuit, a power supply circuit and a circuit board to realize the technical effect of preventing the short circuit of the power supply to the ground without affecting the driving capability of the chip.
第一方面，本实用新型实施例提供了一种电源保护电路，该电源保护电路包括：In the first aspect, the embodiment of the utility model provides a power supply protection circuit, which includes:
第一开关电路、第一芯片、短路检测电路以及第一开关控制电路；a first switch circuit, a first chip, a short circuit detection circuit and a first switch control circuit;
所述第一开关电路连接电源输入端VCC和所述第一芯片的第一电源引脚VCC1；所述电源输入端VCC用于在所述第一开关电路导通时，为所述第一芯片供电；The first switch circuit is connected to the power supply input terminal VCC and the first power supply pin VCC1 of the first chip; the power supply input terminal VCC is used to provide the first chip with a power supply when the first switch circuit is turned on. powered by;
所述短路检测电路分别与所述第一芯片的第一电源引脚VCC1和所述第一开关控制电路连接，用于在检测到所述第一电源引脚VCC1对地短路时，向所述第一开关控制电路输出短路信号；The short-circuit detection circuit is respectively connected to the first power supply pin VCC1 of the first chip and the first switch control circuit, and is used to send a short circuit to the ground when the first power supply pin VCC1 is detected. The first switch control circuit outputs a short-circuit signal;
所述第一开关控制电路与所述第一开关电路连接，用于根据所述短路信号关断所述第一开关电路，以停止所述电源输入端VCC为所述第一芯片供电。The first switch control circuit is connected to the first switch circuit, and is used for turning off the first switch circuit according to the short-circuit signal, so as to stop the power input terminal VCC from supplying power to the first chip.
进一步的，所述短路检测电路包括第一分压电路和第一二极管；Further, the short circuit detection circuit includes a first voltage divider circuit and a first diode;
所述第一分压电路分别连接所述电源输入端VCC和接地端SGND，所述第一分压电路的分压端连接所述第一开关控制电路和所述第一二极管的正极，所述第一二极管的负极与所述第一电源引脚VCC1连接；The first voltage divider circuit is respectively connected to the power supply input terminal VCC and the ground terminal SGND, and the voltage divider end of the first voltage divider circuit is connected to the first switch control circuit and the anode of the first diode, The cathode of the first diode is connected to the first power supply pin VCC1;
所述第一二极管在所述第一芯片正常工作时截止，所述电源输入端VCC的电压经过所述第一分压电路分压处理后，控制所述第一开关控制电路与所述第一开关电路断开连接；The first diode is cut off when the first chip is working normally, and the voltage of the power input terminal VCC is divided by the first voltage divider circuit to control the first switch control circuit and the the first switch circuit is disconnected;
所述第一二极管在所述第一电源引脚VCC1对地短路时导通，所述第一分压电路的分压端的电压被钳位为所述第一二极管的压降，生成所述短路。The first diode is turned on when the first power supply pin VCC1 is short-circuited to ground, and the voltage at the voltage dividing terminal of the first voltage dividing circuit is clamped to the voltage drop of the first diode, The short circuit is generated.
进一步的，所述第一开关控制电路，包括：第一控制支路和第二控制支路；Further, the first switch control circuit includes: a first control branch and a second control branch;
所述第一控制支路连接所述短路检测电路和所述第二控制支路；所述第一控制支路用于根据所述短路信号控制所述第二控制支路导通；The first control branch is connected to the short-circuit detection circuit and the second control branch; the first control branch is used to control the conduction of the second control branch according to the short-circuit signal;
所述第一开关电路与所述第二控制支路连接，所述第一开关电路在所述第二控制支路导通时关断，以停止所述电源输入端VCC为所述第一芯片供电；The first switch circuit is connected to the second control branch, and the first switch circuit is turned off when the second control branch is turned on, so as to stop the power supply input terminal VCC from supplying the first chip powered by;
所述第二控制支路关断时，所述第一开关控制电路与所述第一开关电路断开连接。When the second control branch is turned off, the first switch control circuit is disconnected from the first switch circuit.
进一步的，所述第一控制支路包括：第二分压电路和第一晶体管；Further, the first control branch includes: a second voltage divider circuit and a first transistor;
所述第二分压电路的第一端连接所述电源输入端VCC，所述第二分压电路的第二端连接所述接地端SGND；The first terminal of the second voltage dividing circuit is connected to the power input terminal VCC, and the second terminal of the second voltage dividing circuit is connected to the ground terminal SGND;
所述第一晶体管的控制端连接所述短路检测电路，所述第一晶体管的第一端连接所述第二分压电路的分压端，所述第一晶体管的第二端连接所述接地端SGND；The control terminal of the first transistor is connected to the short circuit detection circuit, the first terminal of the first transistor is connected to the voltage dividing terminal of the second voltage dividing circuit, and the second terminal of the first transistor is connected to the ground terminal SGND;
所述第一晶体管根据所述短路信号关断时，所述电源输入端VCC的电压通过所述第二分压电路分压处理后，控制所述第二控制支路导通，以关断所述第一开关电路。When the first transistor is turned off according to the short-circuit signal, the voltage of the power input terminal VCC is divided by the second voltage divider circuit to control the conduction of the second control branch to turn off the Describe the first switch circuit.
进一步的，所述第二控制支路包括：第二晶体管；Further, the second control branch includes: a second transistor;
所述第二晶体管的控制端连接所述第二分压电路的分压端，所述第二晶体管的第一端连接所述第一开关电路，所述第二晶体管的第二端连接所述接地端SGND；The control terminal of the second transistor is connected to the voltage dividing terminal of the second voltage dividing circuit, the first terminal of the second transistor is connected to the first switch circuit, and the second terminal of the second transistor is connected to the Ground terminal SGND;
当所述第一晶体管根据所述第一分压电路的分压端的电压导通时，所述第二晶体管的控制端通过所述第一晶体管连接所述接地端SGND，关断所述第二晶体管；When the first transistor is turned on according to the voltage of the voltage dividing terminal of the first voltage dividing circuit, the control terminal of the second transistor is connected to the ground terminal SGND through the first transistor, and the second transistor is turned off. transistor;
当所述第一晶体管根据所述短路信号关断时，所述电源输入端VCC的电压通过所述第二分压电路分压处理后，控制所述第二晶体管导通，以关断所述第一开关电路。When the first transistor is turned off according to the short-circuit signal, the voltage of the power input terminal VCC is divided and processed by the second voltage dividing circuit, and the second transistor is controlled to turn on, so as to turn off the first switching circuit.
进一步的，所述第一开关电路包括：第三晶体管和第三分压电路；Further, the first switch circuit includes: a third transistor and a third voltage divider circuit;
所述第三晶体管的第一端连接所述电源输入端VCC，所述第三晶体管的第二端连接所述第一芯片的第一电源引脚VCC1；The first terminal of the third transistor is connected to the power input terminal VCC, and the second terminal of the third transistor is connected to the first power supply pin VCC1 of the first chip;
所述第三分压电路的第一端连接所述电源输入端VCC，所述第三分压电路的第二端连接所述接地端SGND；The first terminal of the third voltage dividing circuit is connected to the power input terminal VCC, and the second terminal of the third voltage dividing circuit is connected to the ground terminal SGND;
所述第三晶体管的控制端分别与所述第三分压电路的分压端和所述第二晶体管的第一端连接；The control terminal of the third transistor is respectively connected to the voltage dividing terminal of the third voltage dividing circuit and the first terminal of the second transistor;
所述第二晶体管关断时，所述电源输入端VCC的电压经过第三分压电路分压处理后，控制所述第三晶体管导通，以使所述电源输入端VCC为所述第一芯片供电；When the second transistor is turned off, the voltage of the power input terminal VCC is divided by the third voltage dividing circuit, and the third transistor is controlled to be turned on, so that the power input terminal VCC is the first Chip power supply;
所述第二晶体管导通时，所述第三晶体管的控制端连接所述接地端SGND，所述第三晶体管关断，以停止所述电源输入端VCC为所述第一芯片供电。When the second transistor is turned on, the control terminal of the third transistor is connected to the ground terminal SGND, and the third transistor is turned off, so as to stop the power input terminal VCC from supplying power to the first chip.
进一步的，还包括：第四开关电路；所述第三分压电路包括第一分压电阻和第二分压电阻；Further, it also includes: a fourth switch circuit; the third voltage dividing circuit includes a first voltage dividing resistor and a second voltage dividing resistor;
所述第一分压电阻的一端与所述电源输入端VCC连接，另一端分别与所述第四开关电路的第一端和所述第二晶体管的第一端连接；One end of the first voltage dividing resistor is connected to the power input terminal VCC, and the other end is respectively connected to the first end of the fourth switch circuit and the first end of the second transistor;
所述第四开关电路的第二端分别与所述第三晶体管的控制端和所述第二分压电阻的第一端连接；The second terminal of the fourth switch circuit is respectively connected to the control terminal of the third transistor and the first terminal of the second voltage dividing resistor;
所述第二分压电阻的第二端与所述接地端SGND连接；The second terminal of the second voltage dividing resistor is connected to the ground terminal SGND;
所述第四开关电路的第一端与所述第四开关电路的第二端导通，且所述第二晶体管关断时，所述第三分压电路对所述电源输入端VCC的电压进行分压处理，控制所述第三晶体管导通，以使所述电源输入端VCC为所述第一芯片供电。When the first end of the fourth switch circuit is connected to the second end of the fourth switch circuit, and the second transistor is turned off, the voltage of the power input terminal VCC by the third voltage divider circuit A voltage division process is performed, and the third transistor is controlled to be turned on, so that the power supply input terminal VCC supplies power to the first chip.
进一步的，还包括：第二开关电路、第二芯片；所述短路检测电路还包括第二二极管；Further, it also includes: a second switch circuit and a second chip; the short circuit detection circuit also includes a second diode;
所述第二二极管的正极与所述第一分压电路的分压端连接，所述第二二极管的负极与所述第二芯片的第二电源引脚VCC2连接；The anode of the second diode is connected to the voltage dividing terminal of the first voltage dividing circuit, and the cathode of the second diode is connected to the second power supply pin VCC2 of the second chip;
所述第二开关电路的第一端连接所述第一二极管的负极，所述第二开关电路的第二端连接所述第二二极管的负极，所述第二开关电路的第三端连接所述接地端SGND；The first end of the second switch circuit is connected to the cathode of the first diode, the second end of the second switch circuit is connected to the cathode of the second diode, and the second end of the second switch circuit is connected to the cathode of the second diode. The three terminals are connected to the ground terminal SGND;
所述第二二极管在所述第二芯片正常工作时截止，所述电源输入端VCC的电压经过所述第一分压电路分压处理后，控制所述第一开关控制电路与所述第一开关电路断开连接；The second diode is cut off when the second chip is working normally, and the voltage of the power input terminal VCC is divided by the first voltage dividing circuit to control the first switch control circuit and the the first switch circuit is disconnected;
所述第二二极管在所述第一电源引脚VCC2对地短路时导通，所述第一分压电路的分压端的电压被钳位为所述第二二极管的压降，生成所述短路信号；The second diode is turned on when the first power supply pin VCC2 is short-circuited to ground, and the voltage at the voltage dividing terminal of the first voltage dividing circuit is clamped to the voltage drop of the second diode, generating said short circuit signal;
在所述第一开关电路关断后，关断所述第二开关电路。After the first switch circuit is turned off, the second switch circuit is turned off.
第二方面，本实用新型实施例还提供了一种电源电路，该电源电路包括第一方面中任一所述的电源保护电路。In the second aspect, the embodiment of the present utility model further provides a power supply circuit, which includes the power supply protection circuit described in any one of the first aspects.
第三方面，本实用新型实施例还提供了一种电路板，该电路板包括第二方面所述的电源电路。In a third aspect, the embodiment of the present invention further provides a circuit board, which includes the power supply circuit described in the second aspect.
本实用新型实施例通过设置电源保护电路包括：第一开关电路、第一芯片、短路检测电路以及第一开关控制电路；所述第一开关电路连接电源输入端VCC和所述第一芯片的第一电源引脚VCC1；所述电源输入端VCC用于在所述第一开关电路导通时，为所述第一芯片供电；所述短路检测电路分别与所述第一芯片的第一电源引脚VCC1和所述第一开关控制电路连接，用于在检测到所述第一电源引脚VCC1对地短路时，向所述第一开关控制电路输出短路信号；所述第一开关控制电路与所述第一开关电路连接，用于根据所述短路信号关断所述第一开关电路，以停止所述电源输入端VCC为所述第一芯片供电，解决电源对地短路的问题，实现芯片驱动能力和输出波形正常的效果。The embodiment of the utility model includes: a first switch circuit, a first chip, a short circuit detection circuit and a first switch control circuit by setting a power protection circuit; the first switch circuit is connected to the power input terminal VCC and the first chip of the first chip. A power supply pin VCC1; the power supply input terminal VCC is used to supply power to the first chip when the first switch circuit is turned on; the short circuit detection circuit is respectively connected to the first power supply pin of the first chip The pin VCC1 is connected to the first switch control circuit, and is used to output a short circuit signal to the first switch control circuit when the first power supply pin VCC1 is detected to be short-circuited to ground; the first switch control circuit is connected to the first switch control circuit. The first switch circuit is connected to turn off the first switch circuit according to the short circuit signal, so as to stop the power supply input terminal VCC from supplying power to the first chip, solve the problem of short circuit of the power supply to ground, and realize chip Drive ability and output waveform normal effect.
附图说明Description of drawings
图1为本实用新型实施例提供的电源保护电路的结构示意图；Fig. 1 is a schematic structural diagram of a power supply protection circuit provided by an embodiment of the present invention;
图2为本实用新型实施例提供的电源保护电路的电路示意图；Fig. 2 is the circuit schematic diagram of the power supply protection circuit that the utility model embodiment provides;
图3为图2中A处的放大图；Fig. 3 is the enlarged view of place A in Fig. 2;
图4为图2中B处的放大图；Fig. 4 is the enlarged view of place B in Fig. 2;
图5为图2中C处的放大图。FIG. 5 is an enlarged view at point C in FIG. 2 .
具体实施方式Detailed ways
下面结合附图和实施例对本实用新型作进一步的详细说明。可以理解的是，此处所描述的具体实施例仅仅用于解释本实用新型，而非对本实用新型的限定。另外还需要说明的是，为了便于描述，附图中仅示出了与本实用新型相关的部分而非全部结构。Below in conjunction with accompanying drawing and embodiment the utility model is described in further detail. It can be understood that the specific embodiments described here are only used to explain the utility model, rather than limit the utility model. In addition, it should be noted that, for the convenience of description, only some structures related to the present utility model are shown in the drawings but not all structures.
图1为本实用新型实施例提供的电源保护电路的结构示意图，图2为本实用新型实施例提供的电源保护电路的电路示意图，图3为图2中A处的放大图，图4为图2中B处的放大图，图5为图2中C处的放大图。本实施例可适用于电源保护的技术领域，具体的，可以用于避免因负载短路导致电源对地短路，造成电源和工作电路中元器件的损坏。本实施例以负载为芯片为例进行说明。一般的，芯片在连接电源的正负极后才能正常工作。当芯片损坏并短路时，容易造成电源对地短路。Fig. 1 is the schematic diagram of the structure of the power protection circuit provided by the embodiment of the utility model, Fig. 2 is the circuit diagram of the power protection circuit provided by the embodiment of the utility model, Fig. 3 is the enlarged view of A place in Fig. 2, Fig. 4 is the diagram The enlarged view of B in Figure 2, and Figure 5 is the enlarged view of C in Figure 2. This embodiment is applicable to the technical field of power supply protection, specifically, it can be used to prevent the power supply from being short-circuited to ground due to a short-circuit of the load, resulting in damage to the power supply and components in the working circuit. This embodiment takes the load as a chip as an example for illustration. Generally, the chip can work normally only after connecting the positive and negative poles of the power supply. When the chip is damaged and short-circuited, it is easy to cause a short circuit between the power supply and the ground.
为了解决这个问题，参照图1-5，本实施提供的电源保护电路具体包括如下结构：In order to solve this problem, referring to Figure 1-5, the power supply protection circuit provided by this implementation specifically includes the following structure:
第一开关电路10、第一芯片20、短路检测电路30以及第一开关控制电路40。The first switch circuit 10 , the first chip 20 , the short circuit detection circuit 30 and the first switch control circuit 40 .
在一实施例中，第一芯片20为功率因素校正芯片，用于对电源输入进行功率因素校正，提高电源的效率。In one embodiment, the first chip 20 is a power factor correction chip, which is used to perform power factor correction on the power input to improve the efficiency of the power supply.
所述第一开关电路10连接电源输入端VCC和所述第一芯片20的第一电源引脚VCC1；所述电源输入端VCC用于在所述第一开关电路10导通时，为所述第一芯片20供电。The first switch circuit 10 is connected to the power input terminal VCC and the first power supply pin VCC1 of the first chip 20; the power input terminal VCC is used to provide the The first chip 20 supplies power.
本实施例中，所述第一开关电路相当于所述电源输入端VCC和所述第一芯片之间的开关，在所述第一开关电路导通时，所述电源输入端VCC才能为所述第一芯片供电。In this embodiment, the first switch circuit is equivalent to a switch between the power input terminal VCC and the first chip. When the first switch circuit is turned on, the power input terminal VCC can be The first chip is powered.
所述短路检测电路分别与所述第一芯片的第一电源引脚VCC1和所述第一开关控制电路连接，用于在检测到所述第一电源引脚VCC1对地短路时，向所述第一开关控制电路输出短路信号。The short-circuit detection circuit is respectively connected to the first power supply pin VCC1 of the first chip and the first switch control circuit, and is used to send a short circuit to the ground when the first power supply pin VCC1 is detected. The first switch control circuit outputs a short circuit signal.
在一实施例中，短路检测电路可以通过检测所述第一电源引脚VCC1的电压变化，确定第一电源引脚VCC1是否对地短路。In an embodiment, the short-circuit detection circuit can determine whether the first power supply pin VCC1 is short-circuited to ground by detecting the voltage change of the first power supply pin VCC1 .
在一实施例中，短路信号体现为电压信号。In one embodiment, the short circuit signal is embodied as a voltage signal.
所述第一开关控制电路与所述第一开关电路连接，用于根据所述短路信号关断所述第一开关电路，以停止所述电源输入端VCC为所述第一芯片供电。The first switch control circuit is connected to the first switch circuit, and is used for turning off the first switch circuit according to the short-circuit signal, so as to stop the power input terminal VCC from supplying power to the first chip.
本实施例中，当第一开关电路关断时，所述电源输入端VCC和所述第一芯片的第一电源引脚VCC1之间断路，则所述电源输入端VCC停止为所述第一芯片供电。In this embodiment, when the first switch circuit is turned off, there is an open circuit between the power input terminal VCC and the first power supply pin VCC1 of the first chip, and the power input terminal VCC stops being the first power supply pin VCC1 of the first chip. Chip power supply.
本实用新型实施例提供的电源保护电路包括：第一开关电路、第一芯片、短路检测电路以及第一开关控制电路；所述第一开关电路连接电源输入端VCC和所述第一芯片的第一电源引脚VCC1；所述电源输入端VCC用于在所述第一开关电路导通时，为所述第一芯片供电；所述短路检测电路分别与所述第一芯片的第一电源引脚VCC1和所述第一开关控制电路连接，用于在检测到所述第一电源引脚VCC1对地短路时，向所述第一开关控制电路输出短路信号；所述第一开关控制电路与所述第一开关电路连接，用于根据所述短路信号关断所述第一开关电路，以停止所述电源输入端VCC为所述第一芯片供电，通过在所述电源输入端VCC和所述第一芯片之间设置第一开关电路，而无需使用限流电阻，一方面解决电源对地短路的问题；另一方面，由于无需使用限流电阻，实现芯片驱动能力和输出波形正常的效果；进一步的，也避免的限流电阻作无用功，影响电源效率。The power supply protection circuit provided by the embodiment of the utility model includes: a first switch circuit, a first chip, a short circuit detection circuit and a first switch control circuit; the first switch circuit is connected to the power input terminal VCC and the first chip of the first chip. A power supply pin VCC1; the power supply input terminal VCC is used to supply power to the first chip when the first switch circuit is turned on; the short circuit detection circuit is respectively connected to the first power supply pin of the first chip The pin VCC1 is connected to the first switch control circuit, and is used to output a short circuit signal to the first switch control circuit when the first power supply pin VCC1 is detected to be short-circuited to ground; the first switch control circuit is connected to the first switch control circuit. The first switch circuit is connected to turn off the first switch circuit according to the short-circuit signal, so as to stop the power supply input terminal VCC from supplying power to the first chip, by connecting the power supply input terminal VCC and the The first switch circuit is set between the first chips without using a current-limiting resistor, on the one hand, the problem of the short circuit of the power supply to the ground is solved; ; Further, the current-limiting resistor is also avoided to do useless work, which affects the efficiency of the power supply.
在上述实施例的基础上，所述短路检测电路包括第一分压电路和第一二极管。Based on the above embodiments, the short circuit detection circuit includes a first voltage divider circuit and a first diode.
所述第一分压电路分别连接所述电源输入端VCC和接地端SGND，所述第一分压电路的分压端连接所述第一开关控制电路和所述第一二极管D318的正极，所述第一二极管D318的负极与所述第一电源引脚VCC1连接。The first voltage divider circuit is respectively connected to the power supply input terminal VCC and the ground terminal SGND, and the voltage divider terminal of the first voltage divider circuit is connected to the first switch control circuit and the anode of the first diode D318 , the cathode of the first diode D318 is connected to the first power supply pin VCC1.
本实施例对第一分压电路的具体实现方式不作限定。This embodiment does not limit the specific implementation manner of the first voltage divider circuit.
在一实施例中，第一分压电路包括滑动变阻器。In one embodiment, the first voltage dividing circuit includes a sliding rheostat.
在一实施例中，参考图2和图4，第一分压电路包括分压电阻R391和分压电阻R392。分压电阻R391和分压电阻R392的连接处为所述第一分压电路的分压端。In an embodiment, referring to FIG. 2 and FIG. 4 , the first voltage dividing circuit includes a voltage dividing resistor R391 and a voltage dividing resistor R392 . The junction of the voltage dividing resistor R391 and the voltage dividing resistor R392 is the voltage dividing terminal of the first voltage dividing circuit.
所述第一二极管D318在所述第一芯片正常工作时截止，所述电源输入端VCC的电压经过所述第一分压电路分压处理后，控制所述第一开关控制电路与所述第一开关电路断开连接。The first diode D318 is cut off when the first chip is working normally, and the voltage of the power input terminal VCC is divided by the first voltage divider circuit to control the first switch control circuit and the The first switch circuit is disconnected.
本实施例中，在第一芯片正常工作时，第一分压电路的分压端为第一二极管D318的正极提供电压，导致第一二极管D318的正极电压小于第一二极管D318的负极电压，使得第一二极管D318截止。In this embodiment, when the first chip is working normally, the voltage dividing terminal of the first voltage dividing circuit provides voltage for the anode of the first diode D318, resulting in the voltage of the anode of the first diode D318 being lower than that of the first diode D318. The negative voltage of D318 makes the first diode D318 cut off.
所述第一二极管D318在所述第一电源引脚VCC1对地短路时导通，所述第一分压电路的分压端的电压被钳位为所述第一二极管D318的压降，生成所述短路信号。The first diode D318 is turned on when the first power supply pin VCC1 is short-circuited to the ground, and the voltage at the voltage dividing terminal of the first voltage dividing circuit is clamped to the voltage of the first diode D318. drop, the short circuit signal is generated.
本实施例中，所述第一电源引脚VCC1对地短路时，第一二极管D318因正极电压大于负极电压而导通，第一分压电路的分压端因第一二极管D318的作用，其电压值为第一二极管D318的压降。In this embodiment, when the first power supply pin VCC1 is short-circuited to ground, the first diode D318 is turned on because the anode voltage is greater than the cathode voltage, and the voltage divider end of the first voltage divider circuit is turned on by the first diode D318 The role of its voltage value is the voltage drop of the first diode D318.
本实施例中，第一开关控制电路根据第一分压电路的分压端的电压判断是否产生短路信号。在第一分压电路的分压端的电压值为第一二极管D318的压降时，生成短路信号，进而第一开关控制电路根据该短路信号关断所述第一开关电路。In this embodiment, the first switch control circuit judges whether to generate a short circuit signal according to the voltage at the voltage dividing terminal of the first voltage dividing circuit. When the voltage at the voltage dividing end of the first voltage dividing circuit is the voltage drop of the first diode D318, a short circuit signal is generated, and then the first switch control circuit turns off the first switch circuit according to the short circuit signal.
在上述实施例的基础上，所述第一开关控制电路，包括：第一控制支路和第二控制支路。On the basis of the above embodiments, the first switch control circuit includes: a first control branch and a second control branch.
所述第一控制支路连接所述短路检测电路和所述第二控制支路；所述第一控制支路用于根据所述短路信号控制所述第二控制支路导通。The first control branch is connected to the short circuit detection circuit and the second control branch; the first control branch is used to control the conduction of the second control branch according to the short circuit signal.
所述第一开关电路与所述第二控制支路连接，所述第一开关电路在所述第二控制支路导通时关断，以停止所述电源输入端VCC为所述第一芯片供电。The first switch circuit is connected to the second control branch, and the first switch circuit is turned off when the second control branch is turned on, so as to stop the power supply input terminal VCC from supplying the first chip powered by.
所述第二控制支路关断时，所述第一开关控制电路与所述第一开关电路断开连接。When the second control branch is turned off, the first switch control circuit is disconnected from the first switch circuit.
本实施例对第一控制支路和第二控制支路的具体实现方式不作限定。This embodiment does not limit the specific implementation manners of the first control branch and the second control branch.
在一实施例中，参照图2和图4，所述第一控制支路包括：第二分压电路和第一晶体管Q305。In an embodiment, referring to FIG. 2 and FIG. 4 , the first control branch includes: a second voltage divider circuit and a first transistor Q305.
所述第二分压电路的第一端连接所述电源输入端VCC，所述第二分压电路的第二端连接所述接地端SGND。A first terminal of the second voltage dividing circuit is connected to the power input terminal VCC, and a second terminal of the second voltage dividing circuit is connected to the ground terminal SGND.
本实施例对第二分压电路的具体实现方式不作限定。This embodiment does not limit the specific implementation manner of the second voltage divider circuit.
在一实施例中，第二分压电路包括滑动变阻器。In an embodiment, the second voltage dividing circuit includes a sliding rheostat.
在一实施例中，参考图2和图4，第二分压电路包括分压电阻R393和分压电阻R394。分压电阻R393和分压电阻R34的连接处为所述第二分压电路的分压端。In an embodiment, referring to FIG. 2 and FIG. 4 , the second voltage dividing circuit includes a voltage dividing resistor R393 and a voltage dividing resistor R394 . The junction of the voltage dividing resistor R393 and the voltage dividing resistor R34 is the voltage dividing terminal of the second voltage dividing circuit.
所述第一晶体管Q305的控制端连接所述短路检测电路，所述第一晶体管Q305的第一端连接所述第二分压电路的分压端，所述第一晶体管Q305的第二端连接所述接地端SGND。The control terminal of the first transistor Q305 is connected to the short circuit detection circuit, the first terminal of the first transistor Q305 is connected to the voltage dividing terminal of the second voltage dividing circuit, and the second terminal of the first transistor Q305 is connected to The ground terminal SGND.
所述第一晶体管Q305根据所述短路信号关断时，所述电源输入端VCC的电压通过所述第二分压电路分压处理后，控制所述第二控制支路导通，以关断所述第一开关电路。When the first transistor Q305 is turned off according to the short-circuit signal, the voltage of the power input terminal VCC is divided and processed by the second voltage dividing circuit, and the second control branch is controlled to be turned on to turn off the first switch circuit.
进一步的，所述第二控制支路包括：第二晶体管Q306；Further, the second control branch includes: a second transistor Q306;
所述第二晶体管Q306的控制端连接所述第二分压电路的分压端，所述第二晶体管Q306的第一端连接所述第一开关电路，所述第二晶体管Q306的第二端连接所述接地端SGND。The control terminal of the second transistor Q306 is connected to the voltage dividing terminal of the second voltage dividing circuit, the first terminal of the second transistor Q306 is connected to the first switch circuit, and the second terminal of the second transistor Q306 Connect the ground terminal SGND.
当所述第一晶体管Q305根据所述第一分压电路的分压端的电压导通时，所述第二晶体管Q306的控制端通过所述第一晶体管Q305连接所述接地端SGND，关断所述第二晶体管Q306。When the first transistor Q305 is turned on according to the voltage at the voltage dividing terminal of the first voltage dividing circuit, the control terminal of the second transistor Q306 is connected to the ground terminal SGND through the first transistor Q305, and the Describe the second transistor Q306.
当所述第一晶体管Q305根据所述短路信号关断时，所述电源输入端VCC的电压通过所述第二分压电路分压处理后，控制所述第二晶体管Q306导通，以关断所述第一开关电路。When the first transistor Q305 is turned off according to the short-circuit signal, the voltage of the power input terminal VCC is divided and processed by the second voltage divider circuit, and the second transistor Q306 is controlled to turn on to turn off the first switch circuit.
本实施例对第一开关电路的具体实现方式不作限定。This embodiment does not limit the specific implementation manner of the first switch circuit.
在一实施例中，所述第一开关电路包括：第三晶体管Q307和第三分压电路。In an embodiment, the first switch circuit includes: a third transistor Q307 and a third voltage divider circuit.
所述第三晶体管Q307的第一端连接所述电源输入端VCC，所述第三晶体管Q307的第二端连接所述第一芯片的第一电源引脚VCC1。A first end of the third transistor Q307 is connected to the power input terminal VCC, and a second end of the third transistor Q307 is connected to the first power pin VCC1 of the first chip.
所述第三分压电路的第一端连接所述电源输入端VCC，所述第三分压电路的第二端连接所述接地端SGND。A first terminal of the third voltage dividing circuit is connected to the power input terminal VCC, and a second terminal of the third voltage dividing circuit is connected to the ground terminal SGND.
所述第三晶体管Q307的控制端分别与所述第三分压电路的分压端和所述第二晶体管Q306的第一端连接。The control terminal of the third transistor Q307 is respectively connected to the voltage dividing terminal of the third voltage dividing circuit and the first terminal of the second transistor Q306.
所述第二晶体管Q306关断时，所述电源输入端VCC的电压经过第三分压电路分压处理后，控制所述第三晶体管Q307导通，以使所述电源输入端VCC为所述第一芯片供电。When the second transistor Q306 is turned off, the voltage of the power input terminal VCC is divided by the third voltage dividing circuit, and the third transistor Q307 is controlled to be turned on, so that the power input terminal VCC is the The first chip is powered.
所述第二晶体管Q306导通时，所述第三晶体管Q307的控制端连接所述接地端SGND，所述第三晶体管Q307关断，以停止所述电源输入端VCC为所述第一芯片供电。When the second transistor Q306 is turned on, the control terminal of the third transistor Q307 is connected to the ground terminal SGND, and the third transistor Q307 is turned off, so as to stop the power supply input terminal VCC from supplying power to the first chip .
在上述实施例的基础上。该电源保护电路还包括：第四开关电路。On the basis of the above-mentioned embodiments. The power protection circuit also includes: a fourth switch circuit.
本实施例对第四开关电路不作限定，参照图2、图3和图5，本实施例中以第四开关电路为光耦控制电路为例进行说明。This embodiment does not limit the fourth switch circuit. Referring to FIG. 2 , FIG. 3 and FIG. 5 , in this embodiment, the fourth switch circuit is an optocoupler control circuit as an example for illustration.
本实施例对第三分压电路的具体实现方式不作限定。This embodiment does not limit the specific implementation manner of the third voltage divider circuit.
在一实施例中，第三分压电路包括滑动变阻器。In one embodiment, the third voltage dividing circuit includes a sliding rheostat.
在一实施例中，所述第三分压电路包括第一分压电阻R377和第二分压电阻R388。In an embodiment, the third voltage dividing circuit includes a first voltage dividing resistor R377 and a second voltage dividing resistor R388.
所述第一分压电阻R377的一端与所述电源输入端VCC连接，另一端分别与所述第四开关电路的第一端和所述第二晶体管Q306的第一端连接。One end of the first voltage dividing resistor R377 is connected to the power input terminal VCC, and the other end is respectively connected to the first end of the fourth switch circuit and the first end of the second transistor Q306.
所述第四开关电路的第二端分别与所述第三晶体管Q307的控制端和所述第二分压电阻R388的第一端连接。The second terminal of the fourth switch circuit is respectively connected to the control terminal of the third transistor Q307 and the first terminal of the second voltage dividing resistor R388.
所述第二分压电阻R388的第二端与所述接地端SGND连接。A second terminal of the second voltage dividing resistor R388 is connected to the ground terminal SGND.
所述第四开关电路的第一端与所述第四开关电路的第二端导通，且所述第二晶体管Q306关断时，所述第三分压电路对所述电源输入端VCC的电压进行分压处理，控制所述第三晶体管Q307导通，以使所述电源输入端VCC为所述第一芯片供电。When the first end of the fourth switch circuit is connected to the second end of the fourth switch circuit, and the second transistor Q306 is turned off, the third voltage divider circuit is connected to the power supply input terminal VCC. The voltage is subjected to voltage division processing, and the third transistor Q307 is controlled to be turned on, so that the power input terminal VCC supplies power to the first chip.
本实施例对第四开关电路的具体实现方式不作限定，本实施例以第四开关电路包括光耦合器为例进行说明。光耦合器亦称光电隔离器或光电耦合器，简称光耦。它是以光为媒介来传输电信号的器件，通常把发光器(红外线发光二极管LED)与受光器(光敏半导体管)封装在同一管壳内。当输入端加电信号时发光器发出光线，受光器接受光线之后就产生光电流，从输出端流出，从而实现了“电—光—电”转换。以光为媒介把输入端信号耦合到输出端的光电耦合器，由于它具有体积小、寿命长、无触点，抗干扰能力强，输出和输入之间绝缘，单向传输信号等优点，在数字电路上获得广泛的应用。This embodiment does not limit the specific implementation manner of the fourth switch circuit, and this embodiment is described by taking the fourth switch circuit including an optocoupler as an example. Optocoupler is also called opto-isolator or opto-coupler, referred to as opto-coupler. It is a device that transmits electrical signals with light as the medium. Usually, the emitter (infrared light-emitting diode LED) and the light receiver (photosensitive semiconductor tube) are packaged in the same package. When the input terminal is powered on, the light emitter emits light, and the light receiver generates photocurrent after receiving the light, which flows out from the output terminal, thus realizing the "electricity-optical-electricity" conversion. The optocoupler, which uses light as a medium to couple the input signal to the output, has the advantages of small size, long life, no contact, strong anti-interference ability, insulation between output and input, and one-way signal transmission. widely used in circuits.
本实施例中，当第四开关电路的开启信号接收端ON/OFF根据接收到的开启信号，通过光耦合器的发光器PC302A与受光器PC302B的配合，控制受光器PC302B导通，即所述第四开关电路的第一端与所述第四开关电路的第二端导通。In this embodiment, when the turn-on signal receiving end of the fourth switch circuit is ON/OFF according to the received turn-on signal, through the cooperation of the light emitter PC302A of the optocoupler and the light receiver PC302B, the light receiver PC302B is controlled to conduct, that is, the The first terminal of the fourth switch circuit is connected to the second terminal of the fourth switch circuit.
在上述实施例的基础上，还包括：第二开关电路、第二芯片；所述短路检测电路还包括第二二极管D317。On the basis of the above embodiments, it further includes: a second switch circuit and a second chip; the short circuit detection circuit further includes a second diode D317.
在一实施例中，第二芯片为LLC谐振电路控制芯片，用于对电源中的LLC谐振电路进行控制。In one embodiment, the second chip is an LLC resonant circuit control chip, which is used to control the LLC resonant circuit in the power supply.
所述第二二极管D317的正极与所述第一分压电路的分压端连接，所述第二二极管D317的负极与所述第二芯片的第二电源引脚VCC2连接。The anode of the second diode D317 is connected to the voltage dividing terminal of the first voltage dividing circuit, and the cathode of the second diode D317 is connected to the second power supply pin VCC2 of the second chip.
所述第二开关电路的第一端连接所述第一二极管D318的负极，所述第二开关电路的第二端连接所述第二二极管D317的负极，所述第二开关电路的第三端连接所述接地端SGND。The first end of the second switch circuit is connected to the cathode of the first diode D318, the second end of the second switch circuit is connected to the cathode of the second diode D317, and the second switch circuit The third terminal of is connected to the ground terminal SGND.
所述第二二极管D317在所述第二芯片正常工作时截止，所述电源输入端VCC的电压经过所述第一分压电路分压处理后，控制所述第一开关控制电路与所述第一开关电路断开连接。The second diode D317 is cut off when the second chip is working normally, and the voltage of the power input terminal VCC is divided by the first voltage divider circuit to control the first switch control circuit and the The first switch circuit is disconnected.
所述第二二极管D317在所述第一电源引脚VCC2对地短路时导通，所述第一分压电路的分压端的电压被钳位为所述第二二极管D317的压降，生成所述短路信号。The second diode D317 is turned on when the first power supply pin VCC2 is short-circuited to the ground, and the voltage at the voltage dividing terminal of the first voltage dividing circuit is clamped to the voltage of the second diode D317. drop, the short circuit signal is generated.
在所述第一开关电路关断后，关断所述第二开关电路。After the first switch circuit is turned off, the second switch circuit is turned off.
本实施例中对第二开关电路的具体实现方式不作限定。在一实施例中，所述第二开关电路包括第四晶体管Q304；所述第四晶体管Q304的第一端与所述第一二极管D318的负极连接，所述第四晶体管Q304的第一端和所述第四晶体管Q304的控制端之间连接有电阻(电阻R356和电阻R361)；所述第四晶体管Q304的控制端连接所述接地端SGND；所述第四晶体管Q304的第二端与所述第二二极管D317的负极连接。A specific implementation manner of the second switch circuit is not limited in this embodiment. In one embodiment, the second switch circuit includes a fourth transistor Q304; the first end of the fourth transistor Q304 is connected to the cathode of the first diode D318, and the first end of the fourth transistor Q304 A resistor (resistor R356 and resistor R361) is connected between the terminal and the control terminal of the fourth transistor Q304; the control terminal of the fourth transistor Q304 is connected to the ground terminal SGND; the second terminal of the fourth transistor Q304 It is connected with the cathode of the second diode D317.
本实施例中，由于所述第二开关电路的第一端连接所述第一二极管D318的负极，而所述第一二极管D318的负极同时连接第一开关电路，当关断第一开关电路时，电源输入端VCC无法通过第一开关电路为第二开关电路供电，也就是说，关断所述第一开关电路，所述第二开关电路也随之被关断。In this embodiment, since the first terminal of the second switch circuit is connected to the cathode of the first diode D318, and the cathode of the first diode D318 is connected to the first switch circuit at the same time, when the second switch circuit is turned off When a switch circuit is used, the power input terminal VCC cannot supply power to the second switch circuit through the first switch circuit, that is, when the first switch circuit is turned off, the second switch circuit is also turned off.
本实施例可以通过同一个短路检测电路实现对多组芯片进行对地短路的检测，增加了电源保护电路设置的灵活性。In this embodiment, the same short-circuit detection circuit can be used to detect the short-circuit to ground of multiple groups of chips, which increases the flexibility of setting the power protection circuit.
在上述实施例中，对第一晶体管Q305、第二晶体管Q306和第三晶体管Q307不作限定，可以是场效应管和三极管等开关管。In the above embodiments, the first transistor Q305, the second transistor Q306 and the third transistor Q307 are not limited, and may be switch transistors such as field effect transistors and triodes.
在上述实施例的基础上，本实用新型实施例还提供了一种电源电路，该电源电路包括上述实施例技术方案中任一所述的电源保护电路。On the basis of the above-mentioned embodiments, an embodiment of the present invention further provides a power supply circuit, which includes the power supply protection circuit described in any one of the technical solutions of the above-mentioned embodiments.
在上述实施例的基础上，本实用新型实施例还提供了一种电路板，该电路板包括上述实施例技术方案中所述的电源电路。On the basis of the above embodiments, the embodiments of the present invention further provide a circuit board, which includes the power supply circuit described in the technical solutions of the above embodiments.
注意，上述仅为本实用新型的较佳实施例及所运用技术原理。本领域技术人员会理解，本实用新型不限于这里所述的特定实施例，对本领域技术人员来说能够进行各种明显的变化、重新调整和替代而不会脱离本实用新型的保护范围。因此，虽然通过以上实施例对本实用新型进行了较为详细的说明，但是本实用新型不仅仅限于以上实施例，在不脱离本实用新型构思的情况下，还可以包括更多其他等效实施例，而本实用新型的范围由所附的权利要求范围决定。Note that the above are only preferred embodiments of the present invention and the applied technical principles. Those skilled in the art will understand that the utility model is not limited to the specific embodiments described here, and various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the utility model. Therefore, although the utility model has been described in detail through the above embodiments, the utility model is not limited to the above embodiments, and can also include more other equivalent embodiments without departing from the concept of the utility model. The scope of the present invention is determined by the appended claims.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920229419.2UCN209345005U (en) | 2019-02-20 | 2019-02-20 | Power protection circuit, power circuit and circuit board |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920229419.2UCN209345005U (en) | 2019-02-20 | 2019-02-20 | Power protection circuit, power circuit and circuit board |
| Publication Number | Publication Date |
|---|---|
| CN209345005Utrue CN209345005U (en) | 2019-09-03 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920229419.2UActiveCN209345005U (en) | 2019-02-20 | 2019-02-20 | Power protection circuit, power circuit and circuit board |
| Country | Link |
|---|---|
| CN (1) | CN209345005U (en) |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111009878A (en)* | 2019-12-26 | 2020-04-14 | 上海派能能源科技股份有限公司 | A multi-output short-circuit protection circuit |
| CN114503411A (en)* | 2019-10-18 | 2022-05-13 | 德克萨斯仪器股份有限公司 | Pin short circuit detection circuit |
| CN114597863A (en)* | 2022-03-07 | 2022-06-07 | 潍柴动力股份有限公司 | Power supply protection circuit |
| CN119155846A (en)* | 2024-11-12 | 2024-12-17 | 珠海市圣昌电子有限公司 | LED dimming power supply capable of reducing standby power consumption and short circuit power consumption |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114503411A (en)* | 2019-10-18 | 2022-05-13 | 德克萨斯仪器股份有限公司 | Pin short circuit detection circuit |
| CN111009878A (en)* | 2019-12-26 | 2020-04-14 | 上海派能能源科技股份有限公司 | A multi-output short-circuit protection circuit |
| CN111009878B (en)* | 2019-12-26 | 2025-07-11 | 上海派能能源科技股份有限公司 | A multi-channel output short-circuit protection circuit |
| CN114597863A (en)* | 2022-03-07 | 2022-06-07 | 潍柴动力股份有限公司 | Power supply protection circuit |
| CN114597863B (en)* | 2022-03-07 | 2024-02-20 | 潍柴动力股份有限公司 | Power protection circuit |
| CN119155846A (en)* | 2024-11-12 | 2024-12-17 | 珠海市圣昌电子有限公司 | LED dimming power supply capable of reducing standby power consumption and short circuit power consumption |
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