CN103812374B - A kind of full-bridge inverter brachium pontis power switch pipe current foldback circuit - Google Patents
A kind of full-bridge inverter brachium pontis power switch pipe current foldback circuit Download PDFInfo
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Abstract
一种全桥逆变器桥臂功率开关管过流保护电路，涉及一种保护电路，型包括三相工频电源的A相、B相、C相、三相整流桥、电流互感器、四个功率管V1、V2、V3、V4、电容电感耦合器、整流滤波器、霍尔电流检测器、负载电阻Rf、过流检测器。电源输出负载Rf上的电流过载或电源短路时，通过霍尔电流检测器、整流滤波器、变压器、电感电容耦合器、功率管V1、V4、V2、V3、电流互感器的耦合，最终使过流检测器的输出电压超过正常值，致使稳压稳流过流保护控制单元停止发出方波脉冲信号，使功率管V1、V4、V2、V3瞬间截止，从而有效地保护了功率管，待电源恢复正常状态时，功率管恢复正常工作。
A full-bridge inverter bridge arm power switch tube overcurrent protection circuit, relates to a protection circuit, including three-phase power frequency power A phase, B phase, C phase, three-phase rectifier bridge, current transformer, four A power tube V1, V2, V3, V4, capacitive inductive coupler, rectifier filter, Hall current detector, load resistor Rf, overcurrent detector. When the current on the output load Rf of the power supply is overloaded or the power supply is short-circuited, through the coupling of the Hall current detector, rectifier filter, transformer, inductance-capacitance coupler, power tubes V1, V4, V2, V3, and current transformer, the overcurrent The output voltage of the current detector exceeds the normal value, causing the constant voltage and constant current overcurrent protection control unit to stop sending square wave pulse signals, so that the power tubes V1, V4, V2, and V3 are cut off instantly, thus effectively protecting the power tubes. When returning to normal state, the power tube resumes normal operation.
Description
技术领域 technical field
本发明涉及一种全桥逆变器桥臂功率开关管过流保护电路。 The invention relates to an overcurrent protection circuit for a power switch tube of a bridge arm of a full-bridge inverter.
背景技术 Background technique
在全桥逆变器装置中，四个桥臂功率开关管承载作高电压和大电流，是整机故障的高发部件，因此对四个桥臂功率开关管的过流保护电路是否十分有效显得特别重要。 In the full-bridge inverter device, the power switch tubes of the four bridge arms carry high voltage and high current, which is a frequent component of the whole machine failure. Therefore, it is very effective to determine whether the overcurrent protection circuit of the power switch tubes of the four bridge arms is very effective. very important.
目前常采用的方法其结构示意图如图3所示，其电路结构是：三相工频电源的A相、B相、C相与三相整流桥的三个输入端相连接，三相整流桥的输出正电压与功率管V1、V3的集电极相连接，所述三相整流桥的输出负电压与功率管V2、V4的发射极相连接，所述功率管V1的发射极与所述功率管V2的集电极、电感电容耦合器的一端相连接，所述电感电容耦合器的另一端与变压器的一个输入端相连接，所述变压器的另一个输入端与电流互感器的初级g1g2绕组的g2端相连接，所述电流互感器的初级g1g2绕组的g1端与所述功率管V3的发射极、所述功率管V4的集电极相连接，所述电流互感器的次级g3g4绕组的g3端和g4端与过流检测器的两输入端相连接，所述变压器的两输出端与整流滤波器的两输入端相连接，所述变压器的另一个输出端与电源输出负端子、负载电阻Rf的一端、所述电源的逻辑地相连接，所述整流滤波器的输出端和霍尔电流检测器的输入端相连接，所述霍尔电流检测器的输出端与电源输出正端子、所述负载电阻Rf的另一端相连接，所述过流检测器的输出信号、所述霍尔电流检测器的输出信号、所述电源输出正端子的输出电压信号送人稳压稳流过流保护控制单元的输入端，所述稳压稳流过流保护控制单元的输出信号送人功率管V1、V2、V3、V4的控制极。 The structural diagram of the method commonly used at present is shown in Figure 3. The circuit structure is: the A phase, B phase, and C phase of the three-phase industrial frequency power supply are connected to the three input terminals of the three-phase rectifier bridge, and the three-phase rectifier bridge The output positive voltage of the power tube V1, V3 is connected to the collector, the output negative voltage of the three-phase rectifier bridge is connected to the emitter of the power tube V2, V4, and the emitter of the power tube V1 is connected to the power The collector of the tube V2 is connected to one end of the inductance-capacitance coupler, the other end of the inductance-capacitance coupler is connected to one input end of the transformer, and the other input end of the transformer is connected to the primary g1g2 winding of the current transformer. The g2 terminal is connected, the g1 terminal of the primary g1g2 winding of the current transformer is connected with the emitter of the power tube V3 and the collector of the power tube V4, and the g3 of the secondary g3g4 winding of the current transformer terminal and g4 end are connected with the two input terminals of the overcurrent detector, the two output terminals of the transformer are connected with the two input terminals of the rectification filter, and the other output terminal of the transformer is connected with the power supply output negative terminal, the load resistance One end of Rf is connected to the logic ground of the power supply, the output terminal of the rectification filter is connected to the input terminal of the Hall current detector, the output terminal of the Hall current detector is connected to the positive output terminal of the power supply, and the input terminal of the Hall current detector is connected. The other end of the load resistor Rf is connected, the output signal of the overcurrent detector, the output signal of the Hall current detector, and the output voltage signal of the positive output terminal of the power supply are sent to the regulated voltage and current overcurrent protection The input terminal of the control unit, the output signal of the stable voltage and current overcurrent protection control unit is sent to the control poles of the power transistors V1, V2, V3 and V4.
图3电路的过载保护的原理是：电路正常工作时，稳压稳流过流保护控制单元向功率管V1、V4、V2、V3的控制极发出连续的周期方波脉冲信号，在上半个周期中，功率管V1V4导通V2V3截止，而在下半个周期中功率管V1V4截止V2V3导通。在上半个周期中，三相整流桥输出正端的电流经功率管V1的集电极、V1的发射极、电感电容耦合器的一端、所述电感电容耦合器的另一端、变压器的一个输入端、变压器的另一个输入端、电流互感器的初级g1g2绕组的g2端、电流互感器的初级g1g2绕组的g1端、功率管V4的集电极、V4的发射极流向三相整流桥输出负端；而在下半个周期中，三相整流桥输出正端的电流经功率管V3的集电极、V3的发射极、电流互感器的初级g1g2绕组的g1端、电流互感器的初级g1g2绕组的g2端、变压器的一个输入端、变压器的另一个输入端、功率管V2的集电极、V2的发射极流向三相整流桥输出负端。在一个周期中，在电流互感器的次级g3g4绕组的两端感应出正负两个方波脉冲，经过过流检测器变换成一个电压信号，此电压信号的电压值的大小与电流互感器的初级g1g2绕组上流过的电流相对应。当电源输出负载Rf上的电流过载或电源短路时，电源输出端的电流超过正常值，通过霍尔电流检测器、整流滤波器、变压器、电感电容耦合器、功率管V1、V4、V2、V3、电流互感器的耦合，最终使过流检测器的输出电压超过正常值，致使稳压稳流过流保护控制单元停止发出方波脉冲信号，使功率管V1、V4、V2、V3瞬间截止，从而有效地保护了功率管，待电源恢复正常状态时，功率管恢复正常工作。 The principle of the overload protection of the circuit in Figure 3 is: when the circuit is working normally, the constant voltage and current overcurrent protection control unit sends a continuous periodic square wave pulse signal to the control poles of the power transistors V1, V4, V2, V3. In one cycle, the power transistor V1V4 is turned on and V2V3 is turned off, and in the second half cycle, the power transistor V1V4 is turned off and V2V3 is turned on. In the first half cycle, the current at the positive output terminal of the three-phase rectifier bridge passes through the collector of the power transistor V1, the emitter of V1, one end of the inductive-capacitive coupler, the other end of the inductive-capacitive coupler, and an input terminal of the transformer , the other input terminal of the transformer, the g2 terminal of the primary g1g2 winding of the current transformer, the g1 terminal of the primary g1g2 winding of the current transformer, the collector of the power tube V4, and the emitter of V4 flow to the output negative terminal of the three-phase rectifier bridge; In the second half cycle, the current of the positive output terminal of the three-phase rectifier bridge passes through the collector of the power tube V3, the emitter of V3, the g1 terminal of the primary g1g2 winding of the current transformer, the g2 terminal of the primary g1g2 winding of the current transformer, One input terminal of the transformer, the other input terminal of the transformer, the collector of the power transistor V2, and the emitter of V2 flow to the output negative terminal of the three-phase rectifier bridge. In one cycle, two positive and negative square wave pulses are induced at the two ends of the secondary g3g4 winding of the current transformer, which are converted into a voltage signal by the overcurrent detector, and the voltage value of the voltage signal is the same as that of the current transformer Corresponding to the current flowing on the primary g1g2 winding. When the current on the output load Rf of the power supply is overloaded or the power supply is short-circuited, the current at the output terminal of the power supply exceeds the normal value, through the Hall current detector, rectifier filter, transformer, inductance-capacitance coupler, power tube V1, V4, V2, V3, The coupling of the current transformer finally causes the output voltage of the overcurrent detector to exceed the normal value, causing the constant voltage and constant current overcurrent protection control unit to stop sending square wave pulse signals, so that the power tubes V1, V4, V2, and V3 are cut off instantly, thereby The power tube is effectively protected, and when the power supply returns to a normal state, the power tube resumes normal operation.
但在实际工作中，因为种种原因，例如由于电网波动或电磁干扰，使稳压稳流过流保护控制单元的功能发生瞬间的紊乱，致使功率管V1V2或V3V4在同一瞬间发生导通，即发生所谓“共导”现象。而发生“共导”时，由于负载Rf上的电流并未增加，因而电流互感器的初级g1g2绕组的电流并未增大，亦即过流检测器的输出电压值仍处正常值，稳压稳流过流保护控制单元不会停止发出脉冲。此时三相整流桥的输出正电压即通过功率管V1的集电极、V1的发射极、V2的集电极、V2的发射极直接流向三相整流桥的输出负电压，由于回路中没有任何负载电阻，强大的电流将流过功率管V1、V2，功率管V1、V2将因此而立即烧毁，因此图3所示的传统的保护电路是不完善的。 However, in actual work, due to various reasons, such as power grid fluctuations or electromagnetic interference, the function of the voltage stabilizing and overcurrent protection control unit is momentarily disturbed, causing the power tube V1V2 or V3V4 to be turned on at the same instant, that is, a The so-called "co-leading" phenomenon. When "common conduction" occurs, because the current on the load Rf does not increase, the current of the primary g1g2 winding of the current transformer does not increase, that is, the output voltage value of the overcurrent detector is still at the normal value, and the voltage regulation The steady flow overcurrent protection control unit will not stop sending pulses. At this time, the output positive voltage of the three-phase rectifier bridge flows directly to the output negative voltage of the three-phase rectifier bridge through the collector of the power tube V1, the emitter of V1, the collector of V2, and the emitter of V2, because there is no load in the circuit resistor, strong current will flow through the power tubes V1 and V2, and the power tubes V1 and V2 will be burned immediately, so the traditional protection circuit shown in Figure 3 is not perfect.
发明内容 Contents of the invention
为了解决上述问题，本发明提供一种全桥逆变器桥臂功率开关管过流保护电路。 In order to solve the above problems, the present invention provides an overcurrent protection circuit for a power switch tube of a bridge arm of a full-bridge inverter.
本发明包括三相工频电源的A相、B相、C相、三相整流桥、电流互感器、四个功率管V1、V2、V3、V4、电容电感耦合器、整流滤波器、霍尔电流检测器、负载电阻Rf，三相工频电源的A相、B相、C相与三相整流桥的三个输入端相连接，所述三相整流桥的输出正电压与电流互感器的初级g1g2绕组的g1端、所述电流互感器的初级g3g4绕组的g3端相连接，所述电流互感器的初级g1g2绕组的g2端与功率管V1的集电极相连接，所述功率管V1的发射极与功率管V2的集电极、电感电容耦合器的一端相连接，所述电感电容耦合器的另一端与变压器的一个输入端相连接，所述变压器的另一个输入端与功率管V3的发射极、功率管V4的集电极相连接，所述功率管V3的集电极与所述电流互感器的初级g3g4绕组的g4端相连接，所述三相整流桥的输出负电压与所述功率管V2、V4的发射极相连接，所述电流互感器的次级g5g6绕组的g5g6两端与过流检测器的两输入端相连接，所述变压器的两输出端与整流滤波单元的两输入端相连接，所述整流滤波器的输出端和霍尔电流检测器的一端相连接，所述霍尔电流检测器的另一端与电源输出正端子、负载电阻Rf的一端相连接，所述变压器另一个输出端与所述电源输出负端子、所述负载电阻Rf的另一端、所述电源的逻辑地相连接，所述过流检测器的输出信号、所述霍尔电流检测器的输出信号、所述电源输出正端子的输出电压信号送人稳压稳流过流保护控制单元，所述稳压稳流过流保护控制单元的输出信号送人功率管V1、V2、V3、V4的控制极。 The present invention includes phase A, phase B, phase C of a three-phase industrial frequency power supply, a three-phase rectifier bridge, a current transformer, four power tubes V1, V2, V3, V4, a capacitive inductive coupler, a rectifier filter, a Hall Current detector, load resistance Rf, A phase, B phase, C phase of three-phase industrial frequency power supply are connected with three input terminals of three-phase rectifier bridge, the output positive voltage of said three-phase rectifier bridge is connected with the current transformer The g1 end of the primary g1g2 winding is connected to the g3 end of the primary g3g4 winding of the current transformer, and the g2 end of the primary g1g2 winding of the current transformer is connected to the collector of the power tube V1, and the power tube V1 The emitter is connected with the collector of the power tube V2 and one end of the inductance-capacitance coupler, the other end of the inductance-capacitance coupler is connected with one input end of the transformer, and the other input end of the transformer is connected with the power tube V3. The emitter is connected to the collector of the power tube V4, the collector of the power tube V3 is connected to the g4 end of the primary g3g4 winding of the current transformer, and the output negative voltage of the three-phase rectifier bridge is connected to the power The emitters of tubes V2 and V4 are connected, the two ends of g5g6 of the secondary g5g6 winding of the current transformer are connected with the two input terminals of the overcurrent detector, and the two output terminals of the transformer are connected with the two input terminals of the rectification and filtering unit The output terminal of the rectifier filter is connected to one end of the Hall current detector, the other end of the Hall current detector is connected to the positive output terminal of the power supply and one end of the load resistor Rf, and the transformer The other output end is connected with the negative terminal of the power supply output, the other end of the load resistor Rf, and the logic ground of the power supply, the output signal of the overcurrent detector, the output signal of the Hall current detector , The output voltage signal of the positive output terminal of the power supply is sent to the voltage stabilizing and current overcurrent protection control unit, and the output signal of the voltage stabilizing and current overcurrent protection control unit is sent to the control of the power transistors V1, V2, V3, V4 pole.
本发明过载保护的原理是：电路正常工作时，稳压稳流过流保护控制单元发出连续的周期方波脉冲信号，在上半个周期中，功率管V1V4导通V2V3截止，而在下半个周期中功率管V1V4截止V2V3导通。在上半个周期中，三相整流桥的输出正电压经电流互感器的初级g1g2绕组的g1端、所述电流互感器的初级g1g2绕组的g2端、功率管V1的集电极、功率管V1的发射极、电感电容耦合器的一端、所述电感电容耦合器的另一端、变压器的一个输入端、变压器的另一个输入端、功率管V4的集电极、功率管V4的发射极流向三相整流桥的输出负端，而在下半个周期中，所述三相整流桥的输出正电压经电流互感器的初级g3g4绕组的g3端、所述电流互感器的初级g3g4绕组的g4端、功率管V3的集电极、功率管V3的发射极、变压器的一个输入端、变压器的另一个输入端、电感电容耦合器的一端、所述电感电容耦合器的另一端、功率管V2的集电极、功率管V2的发射极流向三相整流桥的输出负端。 The principle of the overload protection of the present invention is: when the circuit is working normally, the constant voltage and constant current overcurrent protection control unit sends a continuous periodic square wave pulse signal. During the cycle, the power transistor V1V4 is cut off and V2V3 is turned on. In the first half cycle, the output positive voltage of the three-phase rectifier bridge passes through the g1 terminal of the primary g1g2 winding of the current transformer, the g2 terminal of the primary g1g2 winding of the current transformer, the collector of the power tube V1, and the power tube V1 The emitter of the inductance-capacitance coupler, the other end of the inductance-capacitance coupler, one input terminal of the transformer, the other input terminal of the transformer, the collector of the power tube V4, and the emitter of the power tube V4 flow to the three-phase The output negative terminal of the rectifier bridge, and in the second half cycle, the output positive voltage of the three-phase rectifier bridge passes through the g3 terminal of the primary g3g4 winding of the current transformer, the g4 terminal of the primary g3g4 winding of the current transformer, the power The collector of the tube V3, the emitter of the power tube V3, one input end of the transformer, the other input end of the transformer, one end of the inductance-capacitance coupler, the other end of the inductance-capacitance coupler, the collector of the power tube V2, The emitter of the power tube V2 flows to the output negative terminal of the three-phase rectifier bridge.
电路正常工作时，电流互感器的次级g5g6绕组两端为高频交流方波信号，此方波信号接入过流检测器的输入端，过流检测器的输出电压值的大小反映电流互感器的初级g1g2绕组或电流互感器的初级g3g4绕组的电流大小，当电源输出负载Rf上的电流过载或电源短路时，通过霍尔电流检测器、整流滤波器、变压器、电感电容耦合器、功率管V1、V4、V2、V3、电流互感器的耦合，最终使过流检测器的输出电压超过正常值，致使稳压稳流过流保护控制单元停止发出方波脉冲信号，使功率管V1、V4、V2、V3瞬间截止，从而有效地保护了功率管，待电源恢复正常状态时，功率管恢复正常工作。 When the circuit works normally, the two ends of the secondary winding of the current transformer g5g6 are high-frequency AC square wave signals. This square wave signal is connected to the input end of the overcurrent detector, and the output voltage value of the overcurrent detector reflects the current mutual inductance. The current size of the primary g1g2 winding of the transformer or the primary g3g4 winding of the current transformer, when the current on the power output load Rf is overloaded or the power supply is short-circuited, it will pass through the Hall current detector, rectifier filter, transformer, inductance-capacitance coupler, power The coupling of the tubes V1, V4, V2, V3 and the current transformer finally makes the output voltage of the over-current detector exceed the normal value, causing the voltage-stabilizing and current-stabilizing over-current protection control unit to stop sending square wave pulse signals, so that the power tubes V1, V4, V2, and V3 are cut off instantaneously, thereby effectively protecting the power tube. When the power supply returns to normal state, the power tube resumes normal operation.
本发明在实际工作中，因为种种原因，例如由于电网波动或电磁干扰，使稳压稳流过流保护控制单元的功能发生瞬间的紊乱，致使功率管V1V2或V3V4在同一瞬间均发生导通，即发生所谓“共导”现象。例如功率管V1V2发生“共导”，此时三相整流桥的输出正电压即通过电流互感器的初级g1g2绕组、功率管V1的集电极、V1的发射极、功率管V2的集电极、V2的发射极直接流向三相整流桥的输出负电压，由于回路中没有任何负载电阻，功率管V1、V2将流过较大的电流，此大电流信号立即通过电流互感器的初级g1g2绕组，进而耦合到电流互感器的次级g5g6绕组并经过流检测器将大电流信号送入稳压稳流过流保护控制单元，稳压稳流过流保护控制单元立即停止发出脉冲，使功率管V1V2或V3V4立即关断，从而有效避免了由于“共导”而造成的功率开关管的损坏。如功率管V3V4发生“共导”，其电路保护过程与功率管V1V2发生“共导”的保护过程相类似，不再重复叙述。 In the actual work of the present invention, due to various reasons, such as power grid fluctuations or electromagnetic interference, the function of the voltage stabilizing and overcurrent protection control unit is momentarily disordered, causing the power tubes V1V2 or V3V4 to be turned on at the same moment. That is, the so-called "co-conduction" phenomenon occurs. For example, "common conduction" occurs in the power tube V1V2. At this time, the positive output voltage of the three-phase rectifier bridge passes through the primary g1g2 winding of the current transformer, the collector of the power tube V1, the emitter of V1, the collector of the power tube V2, and the V2 The emitter of the three-phase rectifier bridge directly flows to the output negative voltage of the three-phase rectifier bridge. Since there is no load resistance in the circuit, the power tubes V1 and V2 will flow a relatively large current, and this large current signal will immediately pass through the primary g1g2 winding of the current transformer, and then Coupled to the secondary g5g6 winding of the current transformer and through the current detector, the large current signal is sent to the constant voltage and constant current overcurrent protection control unit, and the constant voltage and constant current overcurrent protection control unit immediately stops sending pulses, so that the power tube V1V2 or V3V4 is turned off immediately, thus effectively avoiding the damage of the power switch tube caused by "common conduction". If "co-conduction" occurs in power tube V3V4, its circuit protection process is similar to the protection process of "co-conduction" in power tube V1V2, and will not be described again.
本发明一种优选的电路连接方式是：所述三相整流桥包括六个二极管D11、D12、D13、D14、D15、D16，所述三相整流桥上连接电感L1、电容C1，所述三相工频电源的A相电源与二极管D11的正极、D12的负极相连接，所述三相工频电源的B相电源与二极管D13的正极、D14的负极相连接，所述三相工频电源的C相电源与二极管D15的正极、D16的负极相连接，所述二极管D11的负极与二极管D13的负极、二极管D15的负极、电感L1的一端相连接，所述电感L1的另一端连接电容器C1的一端且与所述电流互感器初级g1g2绕组的g1端、所述电流互感器初级g3g4绕组的g3端相连接，所述电容器C1的另一端与二极管D12的负极、二极管D14的负极、二极管D16的负极、功率管V2的发射极、功率管V4的发射极相连接，所述电流互感器初级g1g2绕组的g2端与功率管V1的集电极相连接，所述电流互感器初级g3g4绕组的g4端与功率管V3的集电极相连接，所述功率管V1的发射极与功率管V3的集电极、电容器C2的一端相连接，所述电容器C2的另一端与电感L2的一端相连接，所述电感L2的另一端与变压器的初级t1t2绕组的t2端相连接，所述变压器的初级t1t2绕组的t1端与功率管V3的发射极、功率管V4的集电极相连接，所述变压器的次级t3t5绕组的t3端与二极管D31的正极相连接，所述变压器的次级t3t5绕组的t5端与二极管D32的正极相连接，所述变压器的次级t3t5绕组的中心抽头t4与电源输出负端子、电容器C4的一端、负载电阻Rf的一端、电源逻辑地相连接，所述负载电阻Rf的另一端与电源的输出正端子、霍尔电流检测器H的一端相连接，所述霍尔电流检测器H的另一端与电感L3的一端、所述电容器C4的另一端相连接，所述电感L3的另一端与所述二极管D31的负极、所述二极管D32的负极相连接，所述电流互感器次级g5g6绕组的g5端与二极管D21的正极、二极管D22的负极相连接，所述电流互感器次级g5g6绕组的g6端与二极管D23的正极、二极管D24的负极相连接，所述二极管D21的负极与所述二极管D23的负极、电阻器R1的一端、电容器C3的一端相连接，所述二极管D22的正极极与所述二极管D24的正极、所述电容器C3的另一端、电阻器R4的一端、所述电源的逻辑地相连接，所述电阻器R1的另一端与电阻器R2的一端、比较器同相输入端相连接，所述电阻器R2的另一端与所述电源的逻辑地相连接，所述电阻器R4的另一端与电阻器R3的一端、所述比较器的反相输入端相连接，所述电阻器R3的另一端与所述电源的附加电源Vcc相连接，所述比较器的输出信号与所述霍尔电流检测器H的输出信号、所述电源输出正端子的输出电压信号送人稳压稳流过流保护控制单元，所述稳压稳流过流保护控制单元的输出信号送人功率管V1、V2、V3、V4的控制极。 A preferred circuit connection method of the present invention is: the three-phase rectifier bridge includes six diodes D11, D12, D13, D14, D15, D16, the three-phase rectifier bridge is connected with an inductor L1 and a capacitor C1, and the three The A-phase power supply of the phase power frequency power supply is connected with the positive pole of the diode D11 and the negative pole of D12, the B-phase power supply of the three-phase power frequency power supply is connected with the positive pole of the diode D13 and the negative pole of D14, and the three-phase power frequency power supply The phase C power supply of the diode D15 is connected to the anode of the diode D15 and the cathode of the D16, the cathode of the diode D11 is connected to the cathode of the diode D13, the cathode of the diode D15, and one end of the inductance L1, and the other end of the inductance L1 is connected to the capacitor C1 One end of the capacitor C1 is connected to the g1 end of the primary g1g2 winding of the current transformer and the g3 end of the primary g3g4 winding of the current transformer, and the other end of the capacitor C1 is connected to the negative pole of the diode D12, the negative pole of the diode D14, and the diode D16 The negative pole of the power tube V2, the emitter of the power tube V4 are connected, the g2 end of the primary g1g2 winding of the current transformer is connected with the collector of the power tube V1, the g4 of the primary g3g4 winding of the current transformer terminal is connected to the collector of the power tube V3, the emitter of the power tube V1 is connected to the collector of the power tube V3, and one end of the capacitor C2, and the other end of the capacitor C2 is connected to one end of the inductor L2, so The other end of the inductance L2 is connected to the t2 end of the primary t1t2 winding of the transformer, and the t1 end of the primary t1t2 winding of the transformer is connected to the emitter of the power tube V3 and the collector of the power tube V4, and the secondary of the transformer The t3 end of the primary t3t5 winding is connected to the anode of the diode D31, the t5 end of the secondary t3t5 winding of the transformer is connected to the anode of the diode D32, and the center tap t4 of the secondary t3t5 winding of the transformer is connected to the power output negative terminal , one end of the capacitor C4, one end of the load resistor Rf, and the power supply are logically connected, and the other end of the load resistor Rf is connected with the output positive terminal of the power supply and one end of the Hall current detector H, and the Hall current detection The other end of the inductor H is connected to one end of the inductance L3 and the other end of the capacitor C4, the other end of the inductance L3 is connected to the cathode of the diode D31 and the cathode of the diode D32, and the current transformer The g5 end of the secondary g5g6 winding is connected to the anode of the diode D21 and the cathode of the diode D22, the g6 end of the secondary g5g6 winding of the current transformer is connected to the anode of the diode D23 and the cathode of the diode D24, and the diode D21 The negative pole is connected with the negative pole of the diode D23, one end of the resistor R1, and one end of the capacitor C3, and the positive pole of the diode D22 is connected with the positive pole of the diode D24, the other end of the capacitor C3, and one end of the resistor R4. , the logic ground of the power supply is connected, and the other end of the resistor R1 is connected to one end of the resistor R2 and the non-inverting input end of the comparator connected, the other end of the resistor R2 is connected to the logic ground of the power supply, the other end of the resistor R4 is connected to one end of the resistor R3 and the inverting input end of the comparator, and the resistor The other end of the device R3 is connected with the additional power supply Vcc of the power supply, and the output signal of the comparator, the output signal of the Hall current detector H, and the output voltage signal of the positive output terminal of the power supply are sent to stabilize the voltage Steady current and overcurrent protection control unit, the output signal of said constant voltage and constant current overcurrent protection control unit is sent to the control poles of power transistors V1, V2, V3 and V4.
本优选电路工作原理是：三相整流桥由二极管D11、D12、D13、D14、D15、D16、电感L1、电容器C1组成，电流互感器由初级绕组g1g2、初级绕组g3g4、次级绕组g5g6以及磁芯组成，过流检测器由二极管D21、D22、D23、D24、电容器C3、电阻器R1、R2、R3、R4、附加电源Vcc以及比较器组成，功率管V1、V2组成全桥逆变器的第一桥臂，功率管V3、V4组成全桥逆变器的第二桥臂，电感电容耦合器由电容器C2、电感L2组成，变压器由初级绕组t1t2、次级绕组t3t5、次级绕组的中心抽头t4以及铁芯组成，整流滤波器由二极管D31、D32、电感L3、电容器C4组成，霍尔电流检测器符号用H表示，电源输出正端子用+号表示，电源输出负端子用-号表示，电源负载用Rf表示。 The working principle of this optimal circuit is: the three-phase rectifier bridge is composed of diodes D11, D12, D13, D14, D15, D16, inductor L1, capacitor C1, and the current transformer is composed of primary winding g1g2, primary winding g3g4, secondary winding g5g6 and magnetic The overcurrent detector is composed of diodes D21, D22, D23, D24, capacitor C3, resistors R1, R2, R3, R4, additional power supply Vcc and comparator, and the power tubes V1 and V2 are composed of the full bridge inverter. The first bridge arm, power tubes V3 and V4 form the second bridge arm of the full-bridge inverter, the inductance-capacitance coupler is composed of capacitor C2 and inductor L2, and the transformer is composed of primary winding t1t2, secondary winding t3t5, and the center of the secondary winding Composed of tap t4 and iron core, the rectifier filter is composed of diodes D31, D32, inductor L3, and capacitor C4. The symbol of the Hall current detector is represented by H, the positive terminal of the power output is represented by +, and the negative terminal of power output is represented by -. , the power load is represented by Rf.
电路正常工作时，稳压稳流过流保护控制单元发出连续的周期方波脉冲信号，在上半个周期中，功率管V1V4导通V2V3截止，而在下半个周期中功率管V1V4截止V2V3导通。在上半个周期中，三相工频电源经整流桥的二极管D11、D13、D15负极输出的正电压经电感L1、电流互感器的初级g1g2绕组、功率管V1的集电极、功率管V1的发射极、电容C2、电感L2、变压器初级绕组t1t2、功率管V4的集电极、功率管V4的发射极流向三相整流桥的二极管D12、D14、D16的正极而流向三相工频电源，而在下半个周期中，三相工频电源经整流桥的二极管D11、D13、D15的正极输出的正电压经电感L1、电流互感器的初级g3g4绕组、功率管V3的集电极、功率管V3的发射极、变压器初级绕组t1t2、电感L2、电容C2、功率管V2的集电极、功率管V2的发射极流向三相整流桥的二极管D12、D14、D15的正极而流向三相工频电源。 When the circuit is working normally, the constant voltage and current overcurrent protection control unit sends a continuous periodic square wave pulse signal. In the first half cycle, the power tube V1V4 is turned on and V2V3 is turned off, and in the second half cycle, the power tube V1V4 is turned off and V2V3 is turned on. Pass. In the first half cycle, the positive voltage output by the three-phase power frequency power supply through the negative poles of the diodes D11, D13, and D15 of the rectifier bridge passes through the inductor L1, the primary g1g2 winding of the current transformer, the collector of the power tube V1, and the power tube V1. The emitter, capacitor C2, inductor L2, transformer primary winding t1t2, collector of power tube V4, and emitter of power tube V4 flow to the positive poles of diodes D12, D14, and D16 of the three-phase rectifier bridge to flow to the three-phase power frequency power supply, while In the second half cycle, the positive voltage output by the positive poles of the diodes D11, D13 and D15 of the rectifier bridge through the three-phase industrial frequency power supply passes through the inductance L1, the primary g3g4 winding of the current transformer, the collector of the power tube V3, and the power tube V3. The emitter, the transformer primary winding t1t2, the inductor L2, the capacitor C2, the collector of the power tube V2, and the emitter of the power tube V2 flow to the anodes of the diodes D12, D14, and D15 of the three-phase rectifier bridge and flow to the three-phase power frequency power supply.
电路正常工作时，电流互感器的次级g5g6绕组两端为高频交流方波信号，此方波信号接入由二极管D21、D22、D23、D24组成的单相整流桥，二极管D21、D23负极输出的正电压经电容器C3滤波后，送入由R1、R2、电源逻辑地组成的分压器，其分压值送入比较器的同相输入端，由附加电源Vcc、R3、R4组成的分压器，其分压值送入比较器的反相输入端，电源正常工作时，比较器的同相输入端的电压低于反向输入端的电压，比较器的输出电压为低电平。 When the circuit is working normally, the two ends of the secondary winding of the current transformer g5g6 are high-frequency AC square wave signals. This square wave signal is connected to the single-phase rectifier bridge composed of diodes D21, D22, D23, and D24. The negative poles of diodes D21, D23 The output positive voltage is filtered by the capacitor C3, and then sent to the voltage divider composed of R1, R2, and the logic ground of the power supply. The voltage divider is sent to the inverting input of the comparator. When the power supply is working normally, the voltage of the non-inverting input of the comparator is lower than the voltage of the inverting input, and the output voltage of the comparator is low.
其过载保护的原理是：当电源输出负载Rf上的电流过载或电源短路时，大电流信号通过霍尔电流检测器H、电感L3、二极管D31、D32、变压器的次级绕组、变压器的初级绕组、电感L2、电容器C2、功率管V1、V2、V3、V4的耦合，使电流互感器的初级g1g2绕组或g3g4绕组电流明显变大，使电流互感器的次级绕组g5g6绕组的电压明显变高，并经二极管D21、D22、D23、D24的整流、电容器C3的滤波、电阻器R1、R2的分压使比较器的同相输入端的电压高于反相输入端的电压，最终使比较器的输出电压为高电平，此信号送入稳压稳流过流保护控制单元的输入端，致使稳压稳流过流保护控制单元停止发出方波脉冲信号，使功率管V1、V4、V2、V3瞬间截止，从而有效地保护了功率管，待电源恢复正常状态时，功率管恢复正常工作。 The principle of its overload protection is: when the current on the output load Rf of the power supply is overloaded or the power supply is short-circuited, the large current signal passes through the Hall current detector H, the inductor L3, the diodes D31, D32, the secondary winding of the transformer, and the primary winding of the transformer , inductance L2, capacitor C2, and power tubes V1, V2, V3, and V4 coupling, the current of the primary g1g2 winding or g3g4 winding of the current transformer is significantly increased, and the voltage of the secondary winding g5g6 of the current transformer is significantly higher , and rectified by diodes D21, D22, D23, D24, filtered by capacitor C3, and divided by resistors R1 and R2, the voltage of the non-inverting input terminal of the comparator is higher than the voltage of the inverting input terminal, and finally the output voltage of the comparator If it is high level, this signal is sent to the input terminal of the voltage stabilizing and current overcurrent protection control unit, causing the voltage stabilizing and current overcurrent protection control unit to stop sending out square wave pulse signals, so that the power tubes V1, V4, V2, V3 are instantaneously cut off, thereby effectively protecting the power tube, and when the power supply returns to a normal state, the power tube resumes normal operation.
当功率管V1V2或V3V4发生“共导”时，例如功率管V1V2发生“共导”，此时三相工频电源经整流桥的二极管D11、D13、D15的正极输出的正电压经电感L1，使电流通过互感器的初级g1g2绕组、功率管V1的集电极、V1的发射极、功率管V2的集电极、V2的发射极直接流向三相整流桥的二极管D12、D14、D16的正极而流向三相工频电源。由于回路中没有任何负载电阻，功率管V1、V2将流过较大的电流，此大电流信号立即流过电流互感器的初级g1g2绕组，进而耦合到电流互感器的次级g5g6绕组，并使电流互感器的次级绕组g5g6绕组的电压明显变高，并经二极管D21、D22、D23、D24的整流、电容器C3的滤波、电阻器R1、R2的分压使比较器的同相输入端的电压高于反相输入端的电压，最终使比较器的输出电压为高电平，此信号送入稳压稳流过流保护控制单元的输入端，致使稳压稳流过流保护控制单元停止发出方波脉冲信号，使功率管V1、V4、V2、V3瞬间截止，从而有效地保护了功率管。而当功率管V3V4发生“共导”时，此时三相工频电源经整流桥的二极管D11、D13、D15的正极输出的正电压经电感L1，使电流通过互感器的初级g3g4绕组、功率管V3的集电极、V3的发射极、功率管V4的集电极、V4的发射极直接流向直接流向三相整流桥的二极管D12、D14、D16的正极而流向三相工频电源，由于回路中没有任何负载电阻，功率管V3、V4将流过较大的电流，此大电流信号立即流过电流互感器的初级g3g4绕组，进而耦合到电流互感器的次级g5g6绕组，并使电流互感器的次级绕组g5g6绕组的电压明显变高，并经二极管D21、D22、D23、D24的整流、电容器C3的滤波、电阻器R1、R2的分压使比较器的同相输入端的电压高于反相输入端的电压，最终使比较器的输出电压为高电平，此信号送入稳压稳流过流保护控制单元的输入端，致使稳压稳流过流保护控制单元停止发出方波脉冲信号，使功率管V1、V4、V2、V3瞬间截止，从而有效地保护了功率管。 When the power tube V1V2 or V3V4 occurs "common conduction", for example, the power tube V1V2 occurs "common conduction", at this time, the positive voltage output by the positive poles of the diodes D11, D13 and D15 of the rectifier bridge through the three-phase power frequency power supply passes through the inductor L1, Make the current flow through the primary g1g2 winding of the transformer, the collector of the power tube V1, the emitter of V1, the collector of the power tube V2, and the emitter of V2 directly to the anodes of the diodes D12, D14, and D16 of the three-phase rectifier bridge to flow to Three-phase power frequency power supply. Since there is no load resistance in the loop, the power tubes V1 and V2 will flow a large current, and this large current signal will immediately flow through the primary g1g2 winding of the current transformer, and then be coupled to the secondary g5g6 winding of the current transformer, and make The voltage of the secondary winding g5g6 of the current transformer becomes significantly higher, and rectified by diodes D21, D22, D23, D24, filtered by capacitor C3, and divided by resistors R1 and R2, the voltage of the non-inverting input terminal of the comparator is high. The voltage at the inverting input terminal finally makes the output voltage of the comparator high, and this signal is sent to the input terminal of the voltage-stabilizing and current-stabilizing over-current protection control unit, causing the voltage-stabilizing and current-stabilizing over-current protection control unit to stop sending square waves The pulse signal makes the power tubes V1, V4, V2, and V3 cut off instantly, thus effectively protecting the power tubes. And when the power tube V3V4 occurs "common conduction", the positive voltage output by the positive poles of the diodes D11, D13, and D15 of the rectifier bridge through the three-phase power supply at this time passes through the inductor L1, so that the current passes through the primary g3g4 winding of the transformer, and the power The collector of the tube V3, the emitter of V3, the collector of the power tube V4, and the emitter of V4 directly flow to the positive poles of the diodes D12, D14, and D16 of the three-phase rectifier bridge, and then flow to the three-phase power frequency power supply. Without any load resistance, the power tubes V3 and V4 will flow a relatively large current, and this large current signal will immediately flow through the primary g3g4 winding of the current transformer, and then be coupled to the secondary g5g6 winding of the current transformer, and make the current transformer The voltage of the secondary winding g5g6 winding becomes significantly higher, and rectified by diodes D21, D22, D23, D24, filtered by capacitor C3, and divided by resistors R1, R2, so that the voltage of the non-inverting input terminal of the comparator is higher than that of the inverting phase The voltage at the input terminal finally makes the output voltage of the comparator be at a high level, and this signal is sent to the input terminal of the voltage-stabilizing and current-stabilizing over-current protection control unit, causing the voltage-stabilizing and current-stabilizing over-current protection control unit to stop sending a square wave pulse signal, The power tubes V1, V4, V2, and V3 are cut off instantaneously, thereby effectively protecting the power tubes.
附图说明 Description of drawings
图1为本发明一种全桥逆变器桥臂功率开关管过流保护电路的电路图； Fig. 1 is the circuit diagram of a kind of full-bridge inverter bridge arm power switch tube overcurrent protection circuit of the present invention;
图2为本发明一种全桥逆变器桥臂功率开关管过流保护电路的结构图； Fig. 2 is a structural diagram of an overcurrent protection circuit for a bridge arm power switch tube of a full-bridge inverter of the present invention;
图3为传统全桥逆变器桥臂功率开关管过流保护电路的结构图。 FIG. 3 is a structural diagram of an overcurrent protection circuit for a power switch tube of a bridge arm of a traditional full-bridge inverter.
具体实施方式 detailed description
如图2所示，本全桥逆变器桥臂功率开关管过流保护电路，包括三相工频电源的A相、B相、C相、三相整流桥1、电流互感器2、四个功率管V1、V2、V3、V4、电容电感耦合器3、整流滤波器4、霍尔电流检测器5、过流检测器7、变压器6、稳压稳流过流保护控制单元8、负载电阻Rf，三相工频电源的A相、B相、C相与三相整流桥1的三个输入端相连接，三相整流桥1的输出正电压与电流互感器2的初级g1g2绕组的g1端、电流互感器2的初级g3g4绕组的g3端相连接，电流互感器2的初级g1g2绕组的g2端与功率管V1的集电极相连接，电流互感器2的初级g1g2绕组的g1端与电流互感器2的初级g3g4绕组的g4端为同名端,功率管V1的发射极与功率管V2的集电极、电感电容耦合器3的一端相连接，电感电容耦合器3的另一端与变压器6的一个输入端相连接，变压器6的另一个输入端与功率管V3的发射极、功率管V4的集电极相连接，功率管V3的集电极与电流互感器2的初级g3g4绕组的g4端相连接，三相整流桥1的输出负电压与功率管V2、V4的发射极相连接；电流互感器2的次级g5g6绕组的g5g6两端与过流检测器7的两输入端相连接，变压器6的两输出端与整流滤波单元的两输入端相连接，整流滤波器4的输出端和霍尔电流检测器5的一端相连接，霍尔电流检测器5的另一端与电源输出正端子、负载电阻Rf的一端相连接，变压器6另一个输出端与电源输出负端子、负载电阻Rf的另一端、电源的逻辑地相连接，过流检测器7的输出信号、霍尔电流检测器5的输出信号、电源输出正端子的输出电压信号送人稳压稳流过流保护控制单元8，稳压稳流过流保护控制单元8的输出信号送人功率管V1、V2、V3、V4的控制极。 As shown in Figure 2, the full-bridge inverter bridge arm power switch tube overcurrent protection circuit includes A phase, B phase, C phase, three-phase rectifier bridge 1, current transformer 2, four Power tubes V1, V2, V3, V4, capacitive inductive coupler 3, rectifier filter 4, Hall current detector 5, overcurrent detector 7, transformer 6, voltage stabilized current overcurrent protection control unit 8, load Resistor Rf, phase A, phase B and phase C of the three-phase power frequency power supply are connected to the three input terminals of the three-phase rectifier bridge 1, and the positive output voltage of the three-phase rectifier bridge 1 is connected to the primary g1g2 winding of the current transformer 2 The g1 terminal and the g3 terminal of the primary g3g4 winding of current transformer 2 are connected, the g2 terminal of the primary g1g2 winding of current transformer 2 is connected with the collector of power tube V1, the g1 terminal of the primary g1g2 winding of current transformer 2 is connected with The g4 terminal of the primary g3g4 winding of the current transformer 2 is the end of the same name, the emitter of the power tube V1 is connected with the collector of the power tube V2, and one end of the inductance-capacitance coupler 3, and the other end of the inductance-capacitance coupler 3 is connected with the transformer 6 The other input terminal of the transformer 6 is connected with the emitter of the power tube V3 and the collector of the power tube V4, and the collector of the power tube V3 is connected with the g4 terminal of the primary g3g4 winding of the current transformer 2 connection, the output negative voltage of the three-phase rectifier bridge 1 is connected to the emitters of the power tubes V2 and V4; the two ends of g5g6 of the secondary g5g6 winding of the current transformer 2 are connected to the two input terminals of the overcurrent detector 7, and the transformer The two output ends of 6 are connected to the two input ends of the rectification filter unit, the output end of the rectification filter 4 is connected to one end of the Hall current detector 5, and the other end of the Hall current detector 5 is connected to the positive output terminal of the power supply, One end of the load resistor Rf is connected, the other output end of the transformer 6 is connected with the output negative terminal of the power supply, the other end of the load resistor Rf, and the logic ground of the power supply, the output signal of the overcurrent detector 7, the output signal of the Hall current detector 5 The output signal and the output voltage signal of the positive output terminal of the power supply are sent to the voltage-stabilizing and current-stabilizing over-current protection control unit 8, and the output signals of the voltage-stabilizing and current-stabilizing over-current protection control unit 8 are sent to the control of power tubes V1, V2, V3, and V4 pole.
如图1所示，本全桥逆变器桥臂功率开关管过流保护电路的三相工频电源的A相电源与三相整流桥1的二极管D11的正极、D12的负极相连接，三相工频电源的B相电源与三相整流桥1的二极管D13的正极、D14的负极相连接，三相工频电源的C相电源与所述三相整流桥1的二极管D15的正极、D16的负极相连接，二极管D11的负极与二极管D13的负极、二极管D15的负极、电感L1的一端相连接，电感L1的另一端与电容器C1的一端、电流互感器2初级g1g2绕组的g1端、电流互感器2初级g3g4绕组的g3端相连接，电流互感器2的初级g1g2绕组的g1端与电流互感器2的初级g3g4绕组的g4端为同名端,电容器C1的另一端与二极管D12的负极、二极管D14的负极、二极管D16的负极、功率管V2的发射极、功率管V4的发射极相连接，电流互感器2初级g1g2绕组的g2端与功率管V1的集电极相连接，电流互感器2初级g3g4绕组的g4端与功率管V3的集电极相连接，功率管V1的发射极与功率管V3的集电极、电容器C2的一端相连接，电容器C2的另一端与电感L2的一端相连接，电感L2的另一端与变压器6的初级t1t2绕组的t2端相连接，变压器6的初级t1t2绕组的t1端与功率管V3的发射极、功率管V4的集电极相连接，变压器6的次级t3t5绕组的t3端与二极管D31的正极相连接，变压器6的次级t3t5绕组的t5端与二极管D32的正极相连接，变压器6的次级t3t5绕组的中心抽头t4与电源输出负端子、电容器C4的一端、负载电阻Rf的一端、电源逻辑地相连接，负载电阻Rf的另一端与电源的输出正端子、霍尔电流检测器5的一端相连接，霍尔电流检测器5的另一端与电感L3的一端、电容器C4的另一端相连接，电感L3的另一端与二极管D31的负极、二极管D32的负极相连接，电流互感器2次级g5g6绕组的g5端与二极管D21的正极、二极管D22的负极相连接，电流互感器2次级g5g6绕组的g6端与二极管D23的正极、二极管D24的负极相连接，二极管D21的负极与二极管D23的负极、电阻器R1的一端、电容器C3的一端相连接，二极管D22的正极极与所述二极管D24的正极、电容器C3的另一端、电阻器R4的一端、电源的逻辑地相连接，电阻器R1的另一端与电阻器R2的一端、比较器同相输入端相连接，电阻器R2的另一端与电源的逻辑地相连接，电阻器R4的另一端与电阻器R3的一端、比较器的反相输入端相连接，电阻器R3的另一端与电源的附加电源Vcc相连接，比较器的输出信号与霍尔电流检测器5的输出信号、电源输出正端子的输出电压信号送人稳压稳流过流保护控制单元8，稳压稳流过流保护控制单元8的输出信号送人功率管V1、V2、V3、V4的控制极。 As shown in Figure 1, the A-phase power supply of the three-phase power frequency power supply of the full-bridge inverter bridge arm power switch tube overcurrent protection circuit is connected to the positive pole of the diode D11 and the negative pole of D12 of the three-phase rectifier bridge 1, and the three phases The B-phase power supply of the three-phase power frequency power supply is connected to the positive pole of the diode D13 and the negative pole of D14 of the three-phase rectifier bridge 1, and the C-phase power supply of the three-phase power frequency power supply is connected to the positive pole and D16 of the diode D15 of the three-phase rectifier bridge 1. The negative pole of the diode D11 is connected to the negative pole of the diode D13, the negative pole of the diode D15, and one end of the inductor L1, the other end of the inductor L1 is connected to one end of the capacitor C1, the g1 end of the primary g1g2 winding of the current transformer 2, and the current The g3 end of the primary g3g4 winding of the transformer 2 is connected, the g1 end of the primary g1g2 winding of the current transformer 2 and the g4 end of the primary g3g4 winding of the current transformer 2 have the same name, and the other end of the capacitor C1 is connected to the negative pole of the diode D12, The cathode of the diode D14, the cathode of the diode D16, the emitter of the power tube V2, and the emitter of the power tube V4 are connected, and the g2 end of the primary g1g2 winding of the current transformer 2 is connected with the collector of the power tube V1. The g4 terminal of the primary g3g4 winding is connected to the collector of the power tube V3, the emitter of the power tube V1 is connected to the collector of the power tube V3, and one end of the capacitor C2, and the other end of the capacitor C2 is connected to one end of the inductor L2. The other end of the inductor L2 is connected to the t2 end of the primary t1t2 winding of the transformer 6, the t1 end of the primary t1t2 winding of the transformer 6 is connected to the emitter of the power tube V3, and the collector of the power tube V4, and the secondary t3t5 of the transformer 6 The t3 end of the winding is connected to the anode of the diode D31, the t5 end of the secondary t3t5 winding of the transformer 6 is connected to the anode of the diode D32, the center tap t4 of the secondary t3t5 winding of the transformer 6 is connected to the negative terminal of the power output and the capacitor C4 One end, one end of the load resistor Rf, and the logic ground of the power supply are connected, the other end of the load resistor Rf is connected to the output positive terminal of the power supply, and one end of the Hall current detector 5, and the other end of the Hall current detector 5 is connected to the inductor L3 One end of the capacitor C4 is connected to the other end, the other end of the inductance L3 is connected to the cathode of the diode D31 and the cathode of the diode D32, and the g5 end of the secondary g5g6 winding of the current transformer 2 is connected to the anode of the diode D21 and the cathode of the diode D22 The g6 terminal of the secondary g5g6 winding of the current transformer 2 is connected with the positive pole of the diode D23 and the negative pole of the diode D24, the negative pole of the diode D21 is connected with the negative pole of the diode D23, one end of the resistor R1, and one end of the capacitor C3. The anode of the diode D22 is connected to the anode of the diode D24, the other end of the capacitor C3, one end of the resistor R4, and the logic ground of the power supply, and the other end of the resistor R1 is connected to one end of the resistor R2 and the non-inverting input end of the comparator The other end of the resistor R2 is connected to the logic ground of the power supply, and the other end of the resistor R4 is connected to the resistor One end of the resistor R3 is connected to the inverting input end of the comparator, and the other end of the resistor R3 is connected to the additional power supply Vcc of the power supply. The output signal of the comparator is connected to the output signal of the Hall current detector 5 and the positive output terminal of the power supply. The output voltage signal of the voltage is sent to the constant voltage and current overcurrent protection control unit 8, and the output signal of the constant voltage and current overcurrent protection control unit 8 is sent to the control poles of the power transistors V1, V2, V3 and V4.
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| CN2596644Y (en) * | 2003-01-08 | 2003-12-31 | 北京日佳电源有限公司 | IGBT over current protective circuit |
| CN201841343U (en) * | 2010-10-28 | 2011-05-25 | 上海沪通企业集团有限公司 | A manual arc welding machine |
| CN102148494A (en) * | 2010-02-10 | 2011-08-10 | 艾默生网络能源系统北美公司 | Bridge arm conduction protection circuit and rectification circuit |
| CN203859699U (en) * | 2013-12-30 | 2014-10-01 | 扬州双鸿电子有限公司 | Over-current protection circuit of bridge arm power switching tube of full-bridge inverter |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE60210217T2 (en) * | 2001-01-31 | 2006-11-16 | Matsushita Electric Industrial Co., Ltd., Kadoma | SMPS device |
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- 2013-12-30 CN CN201310738397.XA patent/CN103812374B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2596644Y (en) * | 2003-01-08 | 2003-12-31 | 北京日佳电源有限公司 | IGBT over current protective circuit |
| CN102148494A (en) * | 2010-02-10 | 2011-08-10 | 艾默生网络能源系统北美公司 | Bridge arm conduction protection circuit and rectification circuit |
| CN201841343U (en) * | 2010-10-28 | 2011-05-25 | 上海沪通企业集团有限公司 | A manual arc welding machine |
| CN203859699U (en) * | 2013-12-30 | 2014-10-01 | 扬州双鸿电子有限公司 | Over-current protection circuit of bridge arm power switching tube of full-bridge inverter |
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| CN103812374A (en) | 2014-05-21 |
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