CN203225657U - a step-down circuit - Google Patents

Abstract

Translated fromChinese

本实用新型实施例公开了一种降压电路，包括：滤波模块，用于对输入电压进行滤波处理后输出；振荡模块，用于接收所述滤波后的电压，形成振荡电压；感生模块，与所述振荡模块相连，用于接收所述振荡模块产生的振荡电压，生成对应的感应电动势，当所述感应电动势与所述输入电压极性相反时，降低输出电压。采用本实用新型，可低成本、高效率的实现降压，且电路的体积较小。

The embodiment of the utility model discloses a step-down circuit, comprising: a filter module, used for filtering an input voltage and then outputting it; an oscillation module, used for receiving the filtered voltage and forming an oscillation voltage; an induction module, connected to the oscillation module, used for receiving the oscillation voltage generated by the oscillation module and generating a corresponding induced electromotive force, and when the induced electromotive force is opposite to the input voltage in polarity, the output voltage is reduced. The utility model can realize step-down at low cost and high efficiency, and the circuit volume is small.

Description

Translated fromChinese

一种降压电路a step-down circuit

技术领域technical field

本实用新型涉及电子领域，尤其涉及一种降压电路。 The utility model relates to the field of electronics, in particular to a step-down circuit. the

背景技术Background technique

目前现有的降压电路大都使用开关电源来实现，这样必须使用固定的模拟集成芯片来进行设计。不但成本高，效率低，而且电路的体积较大。 At present, most of the existing step-down circuits are realized by switching power supply, so a fixed analog integrated chip must be used for design. Not only the cost is high, but the efficiency is low, and the volume of the circuit is relatively large. the

实用新型内容Utility model content

本实用新型实施例所要解决的技术问题在于，提供一种降压电路。可低成本、高效率的实现降压，且电路的体积较小。 The technical problem to be solved by the embodiment of the utility model is to provide a step-down circuit. The step-down can be realized with low cost and high efficiency, and the volume of the circuit is small. the

为了解决上述技术问题，本实用新型实施例提供了一种降压电路，包括： In order to solve the above technical problems, the embodiment of the utility model provides a step-down circuit, including:

滤波模块，用于对输入电压进行滤波处理后输出； Filtering module, used to filter the input voltage and output it;

振荡模块，用于接收所述滤波后的电压，形成振荡电压； An oscillating module, configured to receive the filtered voltage to form an oscillating voltage;

感生模块，与所述振荡模块相连，用于接收所述振荡模块产生的振荡电压，生成对应的感应电动势，当所述感应电动势与所述输入电压极性相反时，降低输出电压。 The induction module is connected with the oscillating module, and is used for receiving the oscillating voltage generated by the oscillating module, generating a corresponding induced electromotive force, and reducing the output voltage when the induced electromotive force is opposite in polarity to the input voltage. the

其中，所述滤波模块包括第一滤波电容，所述滤波电容的正极接电压输入端，负极接地。 Wherein, the filter module includes a first filter capacitor, the positive pole of the filter capacitor is connected to the voltage input terminal, and the negative pole of the filter capacitor is grounded. the

其中，所述振荡模块包括第一三极管、第二三极管、三端可调稳压器、二极管、第一分压电阻、第二分压电阻、第三分压电阻、第四分压电阻、第五分压电阻及第一充电电容，所述第一三极管的发射极接所述电压输入端，集电极通过第五分压电阻接所述三端可调稳压器的阳极，基极接所述第二三极管的集电极，所述第二三极管的基极接所述三端可调稳压器的阴极，发射极通过所述第二分压电阻接地，所述二极管的负极接所述第一三极管的集电极，正极接地，所述第一分压电阻连接在所述第一三极管的基极与所述第二三极管的发射极之间，所述第三分压电阻连接在所述第二三极管的基极与所述第一三极管的基极之间，所述第四分压电阻一端接所述三端可调稳压器的阳极，另一端接地，所 述三端可调稳压器的控制极接所述感生模块，所述第一充电电容的阳极接所述第一分压电阻与所述第二分压电阻的公共节点，负极接地。 Wherein, the oscillation module includes a first triode, a second triode, a three-terminal adjustable voltage regulator, a diode, a first voltage divider resistor, a second voltage divider resistor, a third voltage divider resistor, a fourth divider resistor piezoresistor, the fifth voltage dividing resistor and the first charging capacitor, the emitter of the first triode is connected to the voltage input terminal, and the collector is connected to the three-terminal adjustable voltage regulator through the fifth voltage dividing resistor anode, the base is connected to the collector of the second triode, the base of the second triode is connected to the cathode of the three-terminal adjustable voltage regulator, and the emitter is grounded through the second voltage dividing resistor , the cathode of the diode is connected to the collector of the first triode, and the anode is grounded, and the first voltage dividing resistor is connected between the base of the first triode and the emitter of the second triode between the poles, the third voltage dividing resistor is connected between the base of the second transistor and the base of the first transistor, and one end of the fourth voltage dividing resistor is connected to the three terminals The anode of the adjustable voltage stabilizer is grounded, the control pole of the three-terminal adjustable voltage stabilizer is connected to the induction module, the anode of the first charging capacitor is connected to the first voltage dividing resistor and the The common node of the second voltage dividing resistor, the negative pole is grounded. the

其中，所述感生模块包括电感、可调电阻及第二充电电容，所述电感的一端接所述第一三极管的集电极，另一端接电压输出端，所述可调电阻连接在所述电压输出端与地之间，所述第二充电电容与所述可调电阻并联，正极接所述电压输出端，负极接地，所述第二充电电容与所述可调电阻的公共节点接所述三端可调稳压器的控制极。 Wherein, the induction module includes an inductor, an adjustable resistor and a second charging capacitor, one end of the inductor is connected to the collector of the first triode, and the other end is connected to the voltage output end, and the adjustable resistor is connected to Between the voltage output terminal and the ground, the second charging capacitor is connected in parallel with the adjustable resistor, the positive pole is connected to the voltage output terminal, the negative pole is grounded, and the common node of the second charging capacitor and the adjustable resistor Connect to the control pole of the three-terminal adjustable voltage regulator. the

其中，所述感生模块还包括第六分压电阻，所述第六分压电阻连接在所述可调电阻与地之间。 Wherein, the sensing module further includes a sixth voltage dividing resistor, and the sixth voltage dividing resistor is connected between the adjustable resistor and ground. the

其中，所述电路还包括第七分压电阻，所述第七分压电阻连接在所述第一三极管的基极与所述第一分压电阻之间。 Wherein, the circuit further includes a seventh voltage dividing resistor connected between the base of the first triode and the first voltage dividing resistor. the

其中，所述电路还包括第二滤波电容，所述第二滤波电容的正极接所述电压输出端，负极接地。 Wherein, the circuit further includes a second filter capacitor, the positive pole of the second filter capacitor is connected to the voltage output terminal, and the negative pole is grounded. the

其中，所述第一三极管的型号为TIP115，所述第二三极管的型号为MPSA20。 Wherein, the model of the first triode is TIP115, and the model of the second triode is MPSA20. the

其中，所述三端可调稳压器的型号为TL431。 Wherein, the model of the three-terminal adjustable voltage regulator is TL431. the

其中，所述二极管的型号为IN5823。 Wherein, the model of the diode is IN5823. the

实施本实用新型实施例，具有如下有益效果： Implementation of the utility model embodiment has the following beneficial effects:

通过使用振荡模块2形成振荡电压，在利用感生模块生成的与输入电压极性相反的感生电动势，从而实现降低输出电压的效果，无须使用模拟集成芯片，成本低，效率高，电路的体积小；使用两个三极管配合三端可调稳压器实现振荡电压的输出，再利用电感感生出与输入电压极性相反的感应电动势，实现降低输出电压的目的，电路结构简单，性能稳定。 By using the oscillating module 2 to form an oscillating voltage, the effect of reducing the output voltage is achieved by using the induced electromotive force generated by the induction module opposite to the polarity of the input voltage, without using an analog integrated chip, low cost, high efficiency, and small circuit size Small; use two triodes with a three-terminal adjustable voltage regulator to realize the output of the oscillating voltage, and then use the inductance to induce an induced electromotive force opposite to the input voltage polarity to achieve the purpose of reducing the output voltage. The circuit structure is simple and the performance is stable. the

附图说明Description of drawings

为了更清楚地说明本实用新型实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本实用新型的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。 In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings based on these drawings without creative work. the

图1是本实用新型降压电路的第一实施例的连接示意图； Fig. 1 is the connection schematic diagram of the first embodiment of the utility model step-down circuit;

图2是本实用新型降压电路的第二实施例的电路示意图。 Fig. 2 is a schematic circuit diagram of the second embodiment of the step-down circuit of the present invention. the

具体实施方式Detailed ways

下面将结合本实用新型实施例中的附图，对本实用新型实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本实用新型一部分实施例，而不是全部的实施例。基于本实用新型中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本实用新型保护的范围。 The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model. the

请参照图1，为本实用新型降压电路的第一实施例的连接示意图，在本实施例中，所述电路包括：滤波模块1、振荡模块2、感生模块3。 Please refer to FIG. 1 , which is a connection schematic diagram of the first embodiment of the step-down circuit of the present invention. In this embodiment, the circuit includes: a filter module 1 , an oscillation module 2 , and an induction module 3 . the

所述滤波模块1用于对输入电压进行滤波处理后输出； The filter module 1 is used to filter the input voltage and then output it;

所述振荡模块2用于接收所述滤波后的电压，形成振荡电压； The oscillation module 2 is used to receive the filtered voltage to form an oscillation voltage;

所述感生模块3与所述振荡模块2相连，用于接收所述振荡模块2产生的振荡电压，生成对应的感应电动势，当所述感应电动势与所述输入电压极性相反时，降低输出电压。 The induction module 3 is connected to the oscillation module 2, and is used to receive the oscillation voltage generated by the oscillation module 2, generate a corresponding induced electromotive force, and reduce the output when the induced electromotive force is opposite to the input voltage polarity. Voltage. the

通过使用振荡模块2形成振荡电压，在利用感生模块生成的与输入电压极性相反的感生电动势，从而实现降低输出电压的效果，无须使用模拟集成芯片，成本低，效率高，电路的体积小。 By using the oscillating module 2 to form an oscillating voltage, the effect of reducing the output voltage is achieved by using the induced electromotive force generated by the induction module opposite to the polarity of the input voltage, without using an analog integrated chip, low cost, high efficiency, and small circuit size Small. the

请参照图2，为降压电路的第二实施例的电路示意图，在本实施例中，所述电路包括：滤波模块、振荡模块、感生模块。 Please refer to FIG. 2 , which is a schematic circuit diagram of a second embodiment of the step-down circuit. In this embodiment, the circuit includes: a filter module, an oscillation module, and an induction module. the

优选地，所述滤波模块包括第一滤波电容C0，所述滤波电容C0的正极接电压输入端，负极接地。 Preferably, the filter module includes a first filter capacitor C0, the positive pole of the filter capacitor C0 is connected to the voltage input terminal, and the negative pole is grounded. the

所述振荡模块包括第一三极管Q1、第二三极管Q2、三端可调稳压器Z、二极管D、第一分压电阻R1、第二分压电阻R2、第三分压电阻R3、第四分压电阻R4、第五分压电阻R5及第一充电电容C1，所述第一三极管Q1的发射极接所述电压输入端，集电极通过第五分压电阻R5接所述三端可调稳压器Z的阳极，基极接所述第二三极管Q2的集电极，所述第二三极管Q2的基极接所述三端可调稳压器Z的阴极，发射极通过所述第二分压电阻R2接地，所述二极管D1的负极接所述第一三极管Q1的集电极，正极接地，所述第一分压电阻R1连接在所述第一三极管Q1的基极与所述第二三极管Q2的发射极之间，所述第三分压 电阻R3连接在所述第二三极管Q2的基极与所述第一三极管Q1的基极之间，所述第四分压电阻R4一端接所述三端可调稳压器Z的阳极，另一端接地，所述三端可调稳压器Z的控制极接所述感生模块，所述第一充电电容C1的阳极接所述第一分压电阻R1与所述第二分压电阻R2的公共节点，负极接地。 The oscillation module includes a first triode Q1, a second triode Q2, a three-terminal adjustable voltage regulator Z, a diode D, a first voltage dividing resistor R1, a second voltage dividing resistor R2, and a third voltage dividing resistor R3, the fourth voltage dividing resistor R4, the fifth voltage dividing resistor R5 and the first charging capacitor C1, the emitter of the first triode Q1 is connected to the voltage input terminal, and the collector is connected to the voltage input terminal through the fifth voltage dividing resistor R5 The anode and base of the three-terminal adjustable voltage regulator Z are connected to the collector of the second triode Q2, and the base of the second triode Q2 is connected to the three-terminal adjustable voltage regulator Z The cathode of the diode, the emitter is grounded through the second voltage dividing resistor R2, the cathode of the diode D1 is connected to the collector of the first triode Q1, and the positive electrode is grounded, and the first voltage dividing resistor R1 is connected to the Between the base of the first transistor Q1 and the emitter of the second transistor Q2, the third voltage dividing resistor R3 is connected between the base of the second transistor Q2 and the first Between the bases of the triode Q1, one end of the fourth voltage dividing resistor R4 is connected to the anode of the three-terminal adjustable voltage regulator Z, and the other end is grounded, and the control electrode of the three-terminal adjustable voltage regulator Z Connected to the induction module, the anode of the first charging capacitor C1 is connected to the common node of the first voltage dividing resistor R1 and the second voltage dividing resistor R2, and the negative electrode is grounded. the

所述感生模块包括电感L、可调电阻R0及第二充电电容C2，所述电感L的一端接所述第一三极管Q1的集电极，另一端接电压输出端，所述可调电阻R0连接在所述电压输出端与地之间，所述第二充电电容C2与所述可调电阻R0并联，正极接所述电压输出端，负极接地，所述第二充电电容C2与所述可调电阻R0的公共节点接所述三端可调稳压器Z的控制极。 The induction module includes an inductance L, an adjustable resistor R0 and a second charging capacitor C2. One end of the inductance L is connected to the collector of the first triode Q1, and the other end is connected to the voltage output end. The adjustable The resistor R0 is connected between the voltage output terminal and the ground, the second charging capacitor C2 is connected in parallel with the adjustable resistor R0, the positive pole is connected to the voltage output terminal, and the negative pole is grounded, and the second charging capacitor C2 is connected to the adjustable resistor R0. The common node of the adjustable resistor R0 is connected to the control pole of the three-terminal adjustable voltage regulator Z. the

更优选地，所述感生模块还包括第六分压电阻R6，所述第六分压电阻R6连接在所述可调电阻R0与地之间。 More preferably, the sensing module further includes a sixth voltage dividing resistor R6, and the sixth voltage dividing resistor R6 is connected between the adjustable resistor R0 and ground. the

所述电路还包括第七分压电阻R7，所述第七分压电阻R7连接在所述第一三极管Q1的基极与所述第一分压电阻R1之间。 The circuit further includes a seventh voltage dividing resistor R7, and the seventh voltage dividing resistor R7 is connected between the base of the first transistor Q1 and the first voltage dividing resistor R1. the

所述电路还包括第二滤波电容C3，所述第二滤波电容C3的正极接所述电压输出端，负极接地。 The circuit further includes a second filter capacitor C3, the positive pole of the second filter capacitor C3 is connected to the voltage output terminal, and the negative pole of the second filter capacitor C3 is grounded. the

所述第一三极管Q1的型号为TIP115，所述第二三极管Q2的型号为MPSA20。 The model of the first transistor Q1 is TIP115, and the model of the second transistor Q2 is MPSA20. the

所述三端可调稳压器Z的型号为TL431。 The model of the three-terminal adjustable voltage regulator Z is TL431. the

所述二极管D1的型号为IN5823。 The model of the diode D1 is IN5823. the

具体地，如图2所示，当前级有电压输入开始供电时，B点电压上升，A点电压降低，Q1导通，能量向后级传输，向负载供电。输出电压从0上升至设定值。这时Z开始动作，B点电压开始降低，当B点电压降低到某个值时，Q2截止，A点电压上升，Q1截止，这时靠电感L存储的能量向负载供电，D1提供电流回路。当电感L供电一段时间后，输出电压开始降低，当输出电压降低到到某个设定值时，Q2重新导通，Q1也随之导通，再次通过电感L向负载供电。这样反复循环。整个过程具体包括两种状态，第一种：Q1进入导通状态。此时A1升为高电位，通过R5和R4分压使得A2点的电位上升，相对的D点电位下降，B点上升，A点下降，提供给Q1导通电流，维持A1点高电位。此正反馈是通过R5和R4形成的，反馈中没有电容，直接作用造成D点电位相对下降。电路中还存在一路负反馈，通过节点A1——C——D，使得D点电位上升， 但是此负反馈通路经过电感L，因此是有延时的，在Q1导通的初期可暂不考虑。此时因A2点电位升高，D点下降或基本无变化，造成D和A2之间的电压小于Z1的基准电压，使得Z1截止。R3使Q2导通，一方面给Q1提供基极电流，另外还经发射极给C1充电，充的电压值基本上由Vin、R3、Q2的放大倍数以及R2决定。A1的电压经过短暂的稳定时间后，由于通过电感L的电流渐变，使得C点电压逐步升高，致使D点电压升高，在D和A2之间电压逐步接近或达到Z1的基准电压时，另外一次状态转换开始：D点上升——B点下降——A点上升——A1点下降，此时Q1截止，经由R5和R4分压——A2点下降——相对的D点就上升，进入第二种状态。第二种：Q1截止状态。此时Q1截止，因为在转换过程中B点电压迅速下降，而E点因C1的原因，造成Q2基极、射极反偏，Q2也截止，Z导通。负载电流通过D1和L保持连续。E点电压即C1上的电压逐渐降低，直到R1和R2的分压点的值。再转换的条件是C点电压下降并带动D点电压下降，并因此使B点电压升高至Q2的发射极正向偏置从而使得Q2导通，并再一次使Q1导通。进入下一个状态。如果没有C1，就无法进入第二种状态，因为Q2不能截止。A到D点的反馈通路有2个，一个是A——R5——A2——D；还有一个是A——电感L——C——D。这两条反馈通路方向是相反的，时间是不一样的，由此就造成了电路周而复始的振荡工作，产生一个开关频率，这个开关频率将使Q1不停的开与关，从而使电感L上生成一个感应电动势，此电压极性方向随Q1的闭合而变化，当Q1闭合时产生一个与输入电压相反方向的感应电动势，从而起到降压作用，当Q1打开时，产生一个与输入电压相同方向的感应电动势，给负载供电。其中，关键点之一在于E点的电压，因为这直接影响回路的工作频率，E点电压越低，电路工作频率越高。当然，储能电感L也影响工作频率，能够存储的能量越少，频率也越高。此外负载越重，频率也会越高。 Specifically, as shown in Figure 2, when the front stage has a voltage input and starts to supply power, the voltage at point B rises, the voltage at point A decreases, Q1 is turned on, and the energy is transmitted to the subsequent stage to supply power to the load. The output voltage rises from 0 to the set value. At this time, Z starts to act, and the voltage at point B begins to drop. When the voltage at point B drops to a certain value, Q2 is cut off, the voltage at point A rises, and Q1 is cut off. At this time, the energy stored in the inductor L supplies power to the load, and D1 provides a current loop. . After the inductor L supplies power for a period of time, the output voltage begins to drop. When the output voltage drops to a certain set value, Q2 is turned on again, and Q1 is also turned on, and the load is supplied with power through the inductor L again. This cycle is repeated. The whole process specifically includes two states, the first one: Q1 enters the conduction state. At this time, A1 rises to a high potential, and the potential of point A2 rises through the voltage division of R5 and R4, the potential of point D decreases, the potential of point B rises, and point A drops, providing conduction current to Q1, and maintaining the high potential of point A1. This positive feedback is formed by R5 and R4, there is no capacitance in the feedback, and the direct effect causes the potential of point D to drop relatively. There is also a negative feedback path in the circuit, through the node A1——C——D, which makes the potential of point D rise, but this negative feedback path passes through the inductor L, so there is a delay, which can be temporarily ignored in the initial stage of Q1 conduction . At this time, because the potential of point A2 rises, point D drops or basically does not change, causing the voltage between D and A2 to be lower than the reference voltage of Z1, so that Z1 is cut off. R3 turns on Q2, on the one hand, it provides base current to Q1, and on the other hand, it also charges C1 through the emitter. The charged voltage value is basically determined by Vin, R3, the magnification of Q2 and R2. After the voltage of A1 goes through a short stabilization time, due to the gradual change of the current through the inductor L, the voltage at point C gradually increases, causing the voltage at point D to increase. When the voltage between D and A2 gradually approaches or reaches the reference voltage of Z1, Another state transition begins: point D rises—point B falls—point A rises—point A1 falls, and Q1 ends at this time, through R5 and R4 partial pressure—point A2 falls—the relative point D rises, into the second state. The second type: Q1 cut-off state. At this time, Q1 is cut off, because the voltage at point B drops rapidly during the conversion process, and at point E, due to C1, the base and emitter of Q2 are reversely biased, Q2 is also cut off, and Z is turned on. The load current is kept continuous through D1 and L. The voltage at point E, that is, the voltage on C1 gradually decreases until the value of the voltage dividing point between R1 and R2. The condition for re-conversion is that the voltage at point C drops and drives the voltage at point D to drop, and thus the voltage at point B rises to the point where the emitter of Q2 is forward-biased so that Q2 is turned on, and Q1 is turned on again. into the next state. Without C1, the second state cannot be entered because Q2 cannot be turned off. There are 2 feedback paths from point A to point D, one is A——R5——A2——D; the other is A——inductance L——C——D. The direction of these two feedback paths is opposite, and the time is different, which causes the circuit to oscillate repeatedly, and generates a switching frequency, which will make Q1 keep on and off, so that the inductance L Generate an induced electromotive force, and the polarity direction of this voltage changes with the closing of Q1. When Q1 is closed, an induced electromotive force in the opposite direction to the input voltage is generated, thereby playing a step-down effect. When Q1 is opened, a voltage equal to the input voltage is generated. The induced electromotive force in the direction supplies power to the load. Among them, one of the key points is the voltage at point E, because it directly affects the operating frequency of the circuit, the lower the voltage at point E, the higher the operating frequency of the circuit. Of course, the energy storage inductance L also affects the operating frequency, the less energy that can be stored, the higher the frequency. In addition, the heavier the load, the higher the frequency. the

使用两个三极管配合三端可调稳压器实现振荡电压的输出，再利用电感感生出与输入电压极性相反的感应电动势，实现降低输出电压的目的，电路结构简单，性能稳定。 Using two transistors with a three-terminal adjustable voltage regulator to realize the output of the oscillating voltage, and then using the inductance to generate an induced electromotive force opposite to the input voltage polarity to achieve the purpose of reducing the output voltage. The circuit structure is simple and the performance is stable. the

需要说明的是，本说明书中的各个实施例均采用递进的方式描述，每个实施例重点说明的都是与其它实施例的不同之处，各个实施例之间相同相似的部分互相参见即可。对于装置实施例而言，由于其与方法实施例基本相似，所以 描述的比较简单，相关之处参见方法实施例的部分说明即可。 It should be noted that each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. For the same and similar parts in each embodiment, refer to each other, that is, Can. For the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and for relevant parts, please refer to the part of the description of the method embodiment. the

通过上述实施例的描述，本实用新型具有以下优点： Through the description of the foregoing embodiments, the utility model has the following advantages:

通过使用振荡模块2形成振荡电压，在利用感生模块生成的与输入电压极性相反的感生电动势，从而实现降低输出电压的效果，无须使用模拟集成芯片，成本低，效率高，电路的体积小；使用两个三极管配合三端可调稳压器实现振荡电压的输出，再利用电感感生出与输入电压极性相反的感应电动势，实现降低输出电压的目的，电路结构简单，性能稳定。 By using the oscillating module 2 to form an oscillating voltage, the effect of reducing the output voltage is achieved by using the induced electromotive force generated by the induction module opposite to the polarity of the input voltage, without using an analog integrated chip, low cost, high efficiency, and small circuit size Small; use two triodes with a three-terminal adjustable voltage regulator to realize the output of the oscillating voltage, and then use the inductance to induce an induced electromotive force opposite to the input voltage polarity to achieve the purpose of reducing the output voltage. The circuit structure is simple and the performance is stable. the

本领域普通技术人员可以理解实现上述实施例方法中的全部或部分流程，是可以通过计算机程序来指令相关的硬件来完成，所述的程序可存储于一计算机可读取存储介质中，该程序在执行时，可包括如上述各方法的实施例的流程。其中，所述的存储介质可为磁碟、光盘、只读存储记忆体（Read-Only Memory，简称ROM）或随机存储记忆体（Random Access Memory，简称RAM）等。 Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be implemented through computer programs to instruct related hardware, and the programs can be stored in a computer-readable storage medium. During execution, it may include the processes of the embodiments of the above-mentioned methods. Wherein, the storage medium may be a magnetic disk, an optical disk, a read-only memory (Read-Only Memory, ROM for short), or a random access memory (Random Access Memory, RAM for short). the

以上所揭露的仅为本实用新型较佳实施例而已，当然不能以此来限定本实用新型之权利范围，因此依本实用新型权利要求所作的等同变化，仍属本实用新型所涵盖的范围。 What is disclosed above is only a preferred embodiment of the utility model, and of course it cannot limit the scope of rights of the utility model. Therefore, equivalent changes made according to the claims of the utility model still fall within the scope of the utility model. the

Claims (10)

1. a reduction voltage circuit is characterized in that, comprising:

Filtration module is used for that input voltage is carried out filtering and handles back output;

Oscillation module is used for receiving described filtered voltage, forms oscillating voltage;

The module of inducting links to each other with described oscillation module, is used for receiving the oscillating voltage that described oscillation module produces, and generates corresponding induced electromotive force, when described induced electromotive force is opposite with described input voltage polarity, and the reduction output voltage.

2. circuit as claimed in claim 1 is characterized in that, described filtration module comprises first filter capacitor, and the positive pole of described filter capacitor connects voltage input end, minus earth.

3. circuit as claimed in claim 2, it is characterized in that, described oscillation module comprises first triode, second triode, three-terminal voltage regulator, diode, first divider resistance, second divider resistance, the 3rd divider resistance, the 4th divider resistance, the 5th divider resistance and first charging capacitor, the emitter of described first triode connects described voltage input end, collector electrode connects the anode of described three-terminal voltage regulator by the 5th divider resistance, base stage connects the collector electrode of described second triode, the base stage of described second triode connects the negative electrode of described three-terminal voltage regulator, emitter is by the described second divider resistance ground connection, the negative pole of described diode connects the collector electrode of described first triode, plus earth, described first divider resistance is connected between the emitter of the base stage of described first triode and described second triode, described the 3rd divider resistance is connected between the base stage of the base stage of described second triode and described first triode, the anode of the described three-terminal voltage regulator of described the 4th divider resistance one termination, other end ground connection, the control utmost point of described three-terminal voltage regulator connects the described module of inducting, the anode of described first charging capacitor connects the common node of described first divider resistance and described second divider resistance, minus earth.

4. circuit as claimed in claim 3, it is characterized in that, the described module of inducting comprises inductance, adjustable resistance and second charging capacitor, the collector electrode of described first triode of one termination of described inductance, another termination voltage output end, described adjustable resistance is connected between described voltage output end and the ground, described second charging capacitor is in parallel with described adjustable resistance, positive pole connects described voltage output end, minus earth, the common node of described second charging capacitor and described adjustable resistance connect the control utmost point of described three-terminal voltage regulator.

5. circuit as claimed in claim 4 is characterized in that, the described module of inducting also comprises the 6th divider resistance, and described the 6th divider resistance is connected between described adjustable resistance and the ground.

6. circuit as claimed in claim 5 is characterized in that, described circuit also comprises the 7th divider resistance, and described the 7th divider resistance is connected between the base stage and described first divider resistance of described first triode.

7. circuit as claimed in claim 6 is characterized in that, described circuit also comprises second filter capacitor, and the positive pole of described second filter capacitor connects described voltage output end, minus earth.

8. circuit as claimed in claim 7 is characterized in that, the model of described first triode is TIP115, and the model of described second triode is MPSA20.

9. circuit as claimed in claim 8 is characterized in that, the model of described three-terminal voltage regulator is TL431.

10. circuit as claimed in claim 9 is characterized in that, the model of described diode is IN5823.

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