技术领域technical field
本发明属于电子电路技术领域，涉及一种用于线性恒流驱动LED的过压调整电路。The invention belongs to the technical field of electronic circuits, and relates to an overvoltage adjustment circuit for linear constant current driving LEDs.
背景技术Background technique
发光二极管LED现在被广泛应用于各个领域，它主要的优点在于体积小，功耗低，成本低。作为一种新的光源，需要对其进行专门的电驱动设计，目前主要的驱动方法有线性驱动和开关电源驱动。线性驱动的方式比较简单，具有电磁干扰EMI小、成本低等优势，在市面上占有很大的份额。但是在电源电压波动的情况下，芯片的输入电压会升高，导致驱动芯片功耗增加，造成芯片发烫甚至烧毁等问题。因此，对于恒流驱动的LED而言，具有过压保护电路可以很好地调节芯片的功耗以及保护驱动芯片。Light-emitting diodes (LEDs) are now widely used in various fields, and their main advantages are small size, low power consumption, and low cost. As a new light source, it needs to be specially designed for electric drive. At present, the main drive methods are linear drive and switching power supply drive. The linear drive method is relatively simple, has the advantages of low electromagnetic interference EMI and low cost, and occupies a large share in the market. However, when the power supply voltage fluctuates, the input voltage of the chip will increase, which will increase the power consumption of the driver chip, causing the chip to heat up or even burn out. Therefore, for LEDs driven by constant current, having an overvoltage protection circuit can well regulate the power consumption of the chip and protect the driving chip.
发明内容Contents of the invention
本发明的目的在于提供一种用于线性恒流驱动LED的过压调整电路。The purpose of the present invention is to provide an overvoltage adjustment circuit for linear constant current driving LED.
本发明的技术方案为：一种用于线性恒流驱动LED的过压调整电路，包括串联LED灯组和恒流模块，其特征在于，还包括分压调节模块；其中，输入电源接串联的LED灯组的正极；串联LED灯组的负极接分压调节模块的输入端；分压调节模块的输出端接恒流模块的输入端。The technical solution of the present invention is: an overvoltage adjustment circuit for linear constant current driving LED, which includes a series LED lamp group and a constant current module, and is characterized in that it also includes a voltage division adjustment module; wherein, the input power is connected to the series The positive pole of the LED lamp group; the negative pole of the series LED lamp group is connected to the input end of the voltage division adjustment module; the output end of the voltage division adjustment module is connected to the input end of the constant current module.
进一步的，所述分压调节模块由PMOS管PMOS1，第一耐压管NM2，分压串联电阻R4，第一电阻R1、第二电阻R2、第三电阻R3，反相器INV和齐纳二极管Zener1构成；其中，PMOS管PMOS1的源极接串联LED灯组的负极；分压串联电阻R4一端接PMOS管PMOS1的源端，另一端接PMOS管PMOS1的漏极；PMOS管PMOS1的栅极接第一电阻R1的一端；第一电阻R1的另一端接PMOS管PMOS1的源极；第二电阻R2的一端接PMOS管PMOS1的源极，另一端接反相器INV的输入端；第三电阻R3的一端接反相器INV的输入端，另一端接GND；第一耐压管NM2的源极接GND，栅极接反相器INV的输出端，漏极接第一电阻R1的一端；齐纳二极管Zener1的负极接反相器INV的输入端，正极接GND。Further, the voltage division adjustment module consists of a PMOS transistor PMOS1, a first withstand voltage transistor NM2, a voltage division series resistor R4, a first resistor R1, a second resistor R2, a third resistor R3, an inverter INV and a Zener diode Zener1 is composed; wherein, the source of the PMOS tube PMOS1 is connected to the negative pole of the series LED lamp group; one end of the voltage dividing series resistor R4 is connected to the source end of the PMOS tube PMOS1, and the other end is connected to the drain of the PMOS tube PMOS1; the gate of the PMOS tube PMOS1 is connected to One end of the first resistor R1; the other end of the first resistor R1 is connected to the source of the PMOS transistor PMOS1; one end of the second resistor R2 is connected to the source of the PMOS transistor PMOS1, and the other end is connected to the input end of the inverter INV; the third resistor One end of R3 is connected to the input end of the inverter INV, and the other end is connected to GND; the source of the first withstand voltage tube NM2 is connected to GND, the gate is connected to the output end of the inverter INV, and the drain is connected to one end of the first resistor R1; The cathode of the Zener diode Zener1 is connected to the input terminal of the inverter INV, and the anode is connected to GND.
进一步的，恒流模块由第二耐压管NM1、第四电阻RS和运算放大器构成；其中第二耐压管NM1的漏极接PMOS管PMOS1的漏极，源极通过第四电阻RS后接地，栅极接运算放大器的输出端；运算放大器的正极接基准电压VREF，负极接第二耐压管NM1的源极。Further, the constant current module is composed of a second voltage-resistant transistor NM1, a fourth resistor RS and an operational amplifier; wherein the drain of the second voltage-resistant transistor NM1 is connected to the drain of the PMOS transistor PMOS1, and the source is grounded after passing through the fourth resistor RS , the gate is connected to the output terminal of the operational amplifier; the positive pole of the operational amplifier is connected to the reference voltage VREF, and the negative pole is connected to the source of the second withstand voltage transistor NM1.
本发明的有益效果为，本发明器件电路主要针对线性恒流输入电压过大带来的功耗过大的问题，当输入电压增大到设定值时，将外接的分压串联电阻串入电路中分担电压，从而降低芯片功耗。The beneficial effect of the present invention is that the device circuit of the present invention mainly aims at the problem of excessive power consumption caused by excessive linear constant current input voltage. The voltage is shared in the circuit, thereby reducing the power consumption of the chip.
附图说明Description of drawings
图1是本发明的用于线性恒流驱动LED的过压调整电路的结构示意图；Fig. 1 is the structure schematic diagram of the overvoltage regulation circuit that is used for linear constant current driving LED of the present invention;
图2是输入电源电压与恒流模块的输入电压的关系示意图。Fig. 2 is a schematic diagram of the relationship between the input power supply voltage and the input voltage of the constant current module.
具体实施方式detailed description
下面结合附图，详细描述本发明的技术方案：Below in conjunction with accompanying drawing, describe technical scheme of the present invention in detail:
本发明的一种用于线性恒流驱动LED的过压调整电路，如图1所示，包括串联LED灯组和恒流模块，其特征在于，还包括分压调节模块；其中，输入电源接串联的LED灯组的正极；串联LED灯组的负极接分压调节模块的输入端；分压调节模块的输出端接恒流模块的输入端；所述分压调节模块由PMOS管PMOS1，第一耐压管NM2，分压串联电阻R4，第一电阻R1、第二电阻R2、第三电阻R3，反相器INV和齐纳二极管Zener1构成；其中，PMOS管PMOS1的源极接串联LED灯组的负极；分压串联电阻R4一端接PMOS管PMOS1的源端，另一端接PMOS管PMOS1的漏极；PMOS管PMOS1的栅极接第一电阻R1的一端；第一电阻R1的另一端接PMOS管PMOS1的源极；第二电阻R2的一端接PMOS管PMOS1的源极，另一端接反相器INV的输入端；第三电阻R3的一端接反相器INV的输入端，另一端接GND；第一耐压管NM2的源极接GND，栅极接反相器INV的输出端，漏极接第一电阻R1的一端；齐纳二极管Zener1的负极接反相器INV的输入端，正极接GND；恒流模块由第二耐压管NM1、第四电阻RS和运算放大器构成；其中第二耐压管NM1的漏极接PMOS管PMOS1的漏极，源极通过第四电阻RS后接地，栅极接运算放大器的输出端；运算放大器的正极接基准电压VREF，负极接第二耐压管NM1的源极。An overvoltage adjustment circuit for linear constant current driving LED of the present invention, as shown in Figure 1, includes a series LED lamp group and a constant current module, and is characterized in that it also includes a voltage division adjustment module; wherein, the input power is connected to The positive poles of the LED lamp groups connected in series; the negative poles of the LED lamp groups connected in series are connected to the input end of the voltage divider adjustment module; the output end of the voltage divider adjustment module is connected to the input end of the constant current module; A pressure-resistant tube NM2, a voltage dividing series resistor R4, a first resistor R1, a second resistor R2, a third resistor R3, an inverter INV and a Zener diode Zener1; wherein, the source of the PMOS tube PMOS1 is connected to a series LED lamp One end of the voltage dividing series resistor R4 is connected to the source end of the PMOS transistor PMOS1, and the other end is connected to the drain electrode of the PMOS transistor PMOS1; the gate of the PMOS transistor PMOS1 is connected to one end of the first resistor R1; the other end of the first resistor R1 is connected to The source of the PMOS transistor PMOS1; one end of the second resistor R2 is connected to the source of the PMOS transistor PMOS1, and the other end is connected to the input end of the inverter INV; one end of the third resistor R3 is connected to the input end of the inverter INV, and the other end is connected to GND; the source of the first withstand voltage tube NM2 is connected to GND, the gate is connected to the output terminal of the inverter INV, and the drain is connected to one end of the first resistor R1; the cathode of the Zener diode Zener1 is connected to the input terminal of the inverter INV, The positive pole is connected to GND; the constant current module is composed of the second withstand voltage tube NM1, the fourth resistor RS and an operational amplifier; the drain of the second withstand voltage tube NM1 is connected to the drain of the PMOS transistor PMOS1, and the source passes through the fourth resistor RS Grounded, the gate connected to the output terminal of the operational amplifier; the positive pole of the operational amplifier connected to the reference voltage VREF, and the negative pole connected to the source of the second withstand voltage transistor NM1.
如图2所示，为输入电源电压与恒流模块的输入电压的关系，可见当输入电源电压高到一定程度时，恒流模块的输入电压会突然下降，使得恒流模块的输入电压降低，一部分电压被分压调节电路分走，从而降低了驱动芯片的功耗。As shown in Figure 2, it is the relationship between the input power supply voltage and the input voltage of the constant current module. It can be seen that when the input power supply voltage is high to a certain extent, the input voltage of the constant current module will suddenly drop, so that the input voltage of the constant current module will decrease. A part of the voltage is divided by the voltage division adjustment circuit, thereby reducing the power consumption of the driver chip.
本发明的工作原理是：The working principle of the present invention is:
当输入电源为零即V1为零时，分压调节模块的PMOS1管子截止，耐压管NM2导通；当电源电压逐渐增大时，恒流模块开始工作，耐压管NM1逐渐进入饱和状态，保持LED驱动电流的恒定状态；此时，NM2管是导通的使得PMOS1管子也导通，让电流流过PMOS1管子，这时的电源电压还不够大，属于正常工作的范围；然而，当电源电压继续增大时，会使得NM2管逐渐进入截止状态，一旦NM2管截止时，PMOS1管也会截止，此时分压串联电阻R4会串入电路，分得一部分电源电压，使得驱动芯片的输入电压下降，从而起到了保护芯片和LED灯组以及降低功耗的作用。如果电压过大，齐纳二极管也会起到一定的保护作用，防止采样的电压过大。同时，调节R2和R3的阻值可以调节此电路的电压起调点，使得电路工作的范围更加的灵活。When the input power is zero, that is, V1 is zero, the PMOS1 tube of the voltage divider adjustment module is cut off, and the withstand voltage tube NM2 is turned on; when the power supply voltage gradually increases, the constant current module starts to work, and the withstand voltage tube NM1 gradually enters a saturated state. Keep the constant state of the LED drive current; at this time, the NM2 tube is turned on so that the PMOS1 tube is also turned on, allowing the current to flow through the PMOS1 tube. At this time, the power supply voltage is not large enough, which belongs to the normal working range; When the voltage continues to increase, the NM2 tube will gradually enter the cut-off state. Once the NM2 tube is cut off, the PMOS1 tube will also be cut off. At this time, the voltage divider series resistor R4 will be connected in series to the circuit to share a part of the power supply voltage, so that the input of the driver chip The voltage drops, thereby protecting the chip and the LED lamp group and reducing power consumption. If the voltage is too large, the zener diode will also play a certain protective role to prevent the sampled voltage from being too large. At the same time, adjusting the resistance values of R2 and R3 can adjust the voltage starting point of the circuit, making the working range of the circuit more flexible.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610284677.1ACN105934021A (en) | 2016-05-03 | 2016-05-03 | Overvoltage adjusting circuit for linear constant-current driving LED |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610284677.1ACN105934021A (en) | 2016-05-03 | 2016-05-03 | Overvoltage adjusting circuit for linear constant-current driving LED |
| Publication Number | Publication Date |
|---|---|
| CN105934021Atrue CN105934021A (en) | 2016-09-07 |
| Application Number | Title | Priority Date | Filing Date |
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| CN201610284677.1APendingCN105934021A (en) | 2016-05-03 | 2016-05-03 | Overvoltage adjusting circuit for linear constant-current driving LED |
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| WD01 | Invention patent application deemed withdrawn after publication | Application publication date:20160907 |