TWI597911B - Circuit with surge protection ability - Google Patents
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Description
本發明是有關於一種電路，且特別是有關於一種具雷擊保護能力的電路。 This invention relates to a circuit and, more particularly, to a circuit with lightning protection capability.
請參照第1A圖，其所繪示為習知變頻器示意圖。習知變頻器100可連接至負載，例如三相直流馬達(three phase DC motor，未繪示)。其中，變頻器100包括：一電磁接觸器(magnetic contactor)110、預充電電阻(pre-charge resistor)Rp、主整流電路(main rectifying circuit)130、一電容器(bulk capacitor)Cb、一控制電路140與一驅動電路(driving circuit)150。 Please refer to FIG. 1A, which is a schematic diagram of a conventional frequency converter. The conventional frequency converter 100 can be connected to a load, such as a three phase DC motor (not shown). The frequency converter 100 includes: a magnetic contactor 110, a pre-charge resistor Rp, a main rectifying circuit 130, a bulk capacitor Cb, and a control circuit 140. And a driving circuit 150.
電磁接觸器110中有一常開開關組(normally-off switch set)b1、b2、b3。當電磁接觸器110的控制端上的控制信號Sc未動作之前，常開開關組b1、b2、b3為打開狀態(open state)，當電磁接觸器110的控制端上的控制信號Sc動作後，常開開關組b1、b2、b3為閉合狀態(close state)。 The electromagnetic contactor 110 has a normally-off switch set b1, b2, b3. The normally open switch groups b1, b2, b3 are in an open state before the control signal Sc on the control terminal of the electromagnetic contactor 110 is inoperative, and after the control signal Sc on the control terminal of the electromagnetic contactor 110 is actuated, The normally open switch groups b1, b2, and b3 are in a closed state.
如第1A圖所示，三相交流電源R、S、T連接至主整流電路130的三個交流輸入端(AC input terminal)，主整流電路130的直流輸出端(DC output terminal)與節點o之間連接預充電電阻Rp。另外電磁接觸器110中的常開開關組b1、b2、b3與預充電電阻Rp並聯。 As shown in FIG. 1A, the three-phase AC power sources R, S, and T are connected to three AC input terminals of the main rectifier circuit 130, and the DC output terminal of the main rectifier circuit 130 and the node o. A precharge resistor Rp is connected between them. Further, the normally open switch groups b1, b2, b3 in the electromagnetic contactor 110 are connected in parallel with the precharge resistor Rp.
再者，電容器Cb、控制電路140與驅動電路150接連接於節點o與接地端Gnd之間。控制電路140可輸出控制信號Sc至電磁接觸器110。另外，控制電路140也可以產生多個驅動信號Sd1~Sd6至驅動電路150，用以控制驅動電路150多個輸出端上的輸出信號Va、Vb、Vc，並進一步控制三相直流馬達(未繪示)。 Furthermore, the capacitor Cb, the control circuit 140 and the drive circuit 150 are connected between the node o and the ground terminal Gnd. Control circuit 140 may output control signal Sc to electromagnetic contactor 110. In addition, the control circuit 140 can also generate a plurality of driving signals Sd1 to Sd6 to the driving circuit 150 for controlling the output signals Va, Vb, and Vc at the plurality of output ends of the driving circuit 150, and further controlling the three-phase DC motor (not drawn Show).
基本上，主整流電路130與預充電電阻Rp形成一預充電路徑(pre-charge path)，而主整流電路130與電磁接觸器110形成一主充電路徑(main charge path)。以下介紹習知變頻器100的運作原理。 Basically, the main rectifier circuit 130 forms a pre-charge path with the pre-charge resistor Rp, and the main rectifier circuit 130 forms a main charge path with the electromagnetic contactor 110. The operation principle of the conventional frequency converter 100 will be described below.
當三相交流電源R、S、T剛連接至電磁接觸器110時，由於控制電路140尚未正常運作，因此無法輸出控制信號Sc。此時，三相交流電源R、S、T輸入主整流電路130的三個交流輸入端後，由主電整流電路130的直流輸出端產生直流電壓(DC voltage)，經由預充電電阻Rp對電容器Cb充電。而電容器Cb上的電壓充電到達穩態電壓Vdc之前，控制電路140無法正常運作。 When the three-phase AC power sources R, S, T are just connected to the electromagnetic contactor 110, since the control circuit 140 has not been operating normally, the control signal Sc cannot be output. At this time, after the three-phase AC power sources R, S, and T are input to the three AC input terminals of the main rectifier circuit 130, a DC voltage is generated from the DC output terminal of the main power rectifier circuit 130, and the capacitor is passed through the precharge resistor Rp. Cb charging. The control circuit 140 does not operate normally until the voltage on the capacitor Cb is charged to reach the steady state voltage Vdc.
當充電器Cb充電至穩態電壓Vdc之後，控制電路 140開始正常運作，並輸出控制信號Sc。此時，電磁接觸器110的常開開關組b1、b2、b3變為閉合狀態(close state)。因此，主整流電路130的直流輸出端產生穩態電壓Vdc不經過預充電電阻Rp而直接傳遞至電容器Cb。 Control circuit after charger Cb is charged to steady state voltage Vdc The 140 starts normal operation and outputs a control signal Sc. At this time, the normally open switch groups b1, b2, and b3 of the electromagnetic contactor 110 are brought into a closed state. Therefore, the DC output terminal of the main rectifier circuit 130 generates a steady state voltage Vdc which is directly transmitted to the capacitor Cb without passing through the precharge resistor Rp.
另外，當控制電路140正常運作時，控制電路140即產生多個驅動信號Sd1~Sd6至驅動電路150，用以控制驅動電路150多個輸出端上的輸出信號Va、Vb、Vc。 In addition, when the control circuit 140 is normally operated, the control circuit 140 generates a plurality of driving signals Sd1 SSd6 to the driving circuit 150 for controlling the output signals Va, Vb, Vc at the plurality of output ends of the driving circuit 150.
請參照第1B圖，其所繪示為驅動電路150的電路示意圖。驅動電路150中包括六個電晶體Q1~Q6。第一電晶體Q1集極接收穩態電壓Vdc，基極接收第一驅動信號Sd1，射極連接至節點x。第二電晶體Q2集極接收穩態電壓Vdc，基極接收第二驅動信號Sd2，射極連接至節點y。第三電晶體Q3集極接收穩態電壓Vdc，基極接收第三驅動信號Sd3，射極連接至節點z。 Please refer to FIG. 1B , which is a circuit diagram of the driving circuit 150 . The drive circuit 150 includes six transistors Q1 to Q6. The first transistor Q1 collector receives the steady state voltage Vdc, the base receives the first drive signal Sd1, and the emitter is coupled to the node x. The second transistor Q2 collector receives the steady state voltage Vdc, the base receives the second drive signal Sd2, and the emitter is coupled to the node y. The third transistor Q3 collector receives the steady state voltage Vdc, the base receives the third drive signal Sd3, and the emitter is coupled to the node z.
第四電晶體Q4集極連接至節點x，基極接收第四驅動信號Sd4，射極連接至接地端。第五電晶體Q5集極連接至節點y，基極接收第五驅動信號Sd5，射極連接至接地端。第六電晶體Q6集極連接至節點z，基極接收第六驅動信號Sd6，射極連接至接地端。再者，節點x、y、z即為驅動電路150的輸出端可產生輸出信號Va、Vb、Vc，用以控制三相直流馬達(未繪示)。 The fourth transistor Q4 is connected to the node x, the base receives the fourth drive signal Sd4, and the emitter is connected to the ground. The fifth transistor Q5 is connected to the node y, the base receives the fifth driving signal Sd5, and the emitter is connected to the ground. The sixth transistor Q6 is connected to the node z, the base receives the sixth drive signal Sd6, and the emitter is connected to the ground. Furthermore, the nodes x, y, and z are output terminals of the driving circuit 150 to generate output signals Va, Vb, and Vc for controlling a three-phase DC motor (not shown).
基本上，控制電路140利用驅動信號Sd1~Sd6來控制對應電晶體Q1~Q6的開啟(turn on)或關閉(turn off)，並進一步控制輸出信號Va、Vb、Vc的波形(waveform)。 Basically, the control circuit 140 controls the turn-on or turn-off of the corresponding transistors Q1 to Q6 by using the drive signals Sd1 to Sd6, and further controls the waveforms of the output signals Va, Vb, and Vc.
當變頻器100製造完成後，需要進行雷極測試(surge immunity test)。由於習知電磁接觸器110可承受高電壓，因此當主整流電路130運作時，約4KV的雷極電壓(surge voltage)所產生的大電流可順利地通過主整流電路130及電磁接觸器110至電容器Cb，而不會損壞變頻器100，並通過雷擊測試。 When the inverter 100 is manufactured, a surge immunity test is required. Since the conventional electromagnetic contactor 110 can withstand a high voltage, when the main rectifying circuit 130 operates, a large current generated by a surge voltage of about 4 kV can smoothly pass through the main rectifying circuit 130 and the electromagnetic contactor 110. Capacitor Cb without damaging the frequency converter 100 and passing the lightning strike test.
然而，由於習知電磁接觸器110的體積非常大，所以會使得變頻器100的體積過大。如果為了減少變頻器100的體積而利用其他電路元件來取代電磁接觸器110，則變頻器100可能無法通過雷擊測試。 However, since the size of the conventional electromagnetic contactor 110 is very large, the volume of the frequency converter 100 is excessively large. If other circuit components are used in place of the electromagnetic contactor 110 in order to reduce the volume of the frequency converter 100, the frequency converter 100 may not pass the lightning strike test.
本發明係有關於一種電路，包括：一預充電整流電路，連接至一交流電源；一預充電電阻，具有一第一端連接至該預充電整流電路的一直流輸出端；一壓敏電阻，具有一第一端連接至該預充電整流電路的該直流輸出端；一開關，具有一第一端連接至該預充電電阻的一第二端，具有一第二端連接至該壓敏電阻的一第二端，具有一第三端連接至一第一節點，其中該開關接收一第一控制信號，當該第一控制信號未動作時，該開關的該第一端與該第三端相連，當該第一控制信號動作時，該開關的該第二端與該第三端相連；一主整流電路，連接至該交流電源，該主整流電路的一直流輸出端連接至該第一節點；一電容器，連接於該第一節點與一接地端之間；一控制電路，連接於該第一節點與 一接地端之間；其中，該控制電路產生該第一控制信號至該開關，該控制電路產生另一控制信號組至該主整流電路。 The invention relates to a circuit comprising: a pre-charge rectifier circuit connected to an AC power source; a pre-charge resistor having a first end connected to the DC output of the pre-charge rectifier circuit; a varistor, Having a first end connected to the DC output terminal of the precharge rectifier circuit; a switch having a first end connected to a second end of the precharge resistor and having a second end connected to the varistor a second end having a third end connected to a first node, wherein the switch receives a first control signal, and when the first control signal is not activated, the first end of the switch is connected to the third end When the first control signal is activated, the second end of the switch is connected to the third end; a main rectifying circuit is connected to the AC power source, and the DC output end of the main rectifying circuit is connected to the first node a capacitor connected between the first node and a ground; a control circuit coupled to the first node and Between a ground terminal; wherein the control circuit generates the first control signal to the switch, and the control circuit generates another control signal group to the main rectifier circuit.
為了對本發明之上述及其他方面有更佳的瞭解，下文特舉較佳實施例，並配合所附圖式，作詳細說明如下： In order to better understand the above and other aspects of the present invention, the preferred embodiments are described below, and in conjunction with the drawings, the detailed description is as follows:
100、200‧‧‧變頻器 100,200‧‧‧Inverter
110‧‧‧電磁接觸器 110‧‧‧Electromagnetic contactor
220‧‧‧預充電整流電路 220‧‧‧Precharge rectifier circuit
130、230‧‧‧主整流電路 130, 230‧‧‧ main rectifier circuit
140、240‧‧‧控制電路 140, 240‧‧‧ control circuit
150、250‧‧‧驅動電路 150, 250‧‧‧ drive circuit
260‧‧‧開關 260‧‧‧ switch
第1A圖所繪示為習知變頻器示意圖。 Figure 1A is a schematic diagram of a conventional frequency converter.
第1B圖所繪示為驅動電路的電路示意圖。 FIG. 1B is a circuit diagram showing a driving circuit.
第2A圖所繪示為本發明電路應用於變頻器的示意圖。 FIG. 2A is a schematic diagram showing the application of the circuit of the present invention to a frequency converter.
第2B圖所繪示主整流電路的電路示意圖。 FIG. 2B is a schematic circuit diagram of the main rectifier circuit.
本發明為一種電路，具備雷擊保護能力，應用到變頻器時，變頻器不需要大體積的電磁接觸器，使得變頻器的體積減小且具備雷擊保護能力。 The invention is a circuit with lightning protection capability. When applied to a frequency converter, the frequency converter does not need a large-volume electromagnetic contactor, so that the frequency converter is reduced in volume and has lightning protection capability.
請參照第2A圖，其所繪示為本發明電路應用於變頻器的示意圖。本發明之電路應用到變頻器200時可連接至負載(未繪示)，本發明電路包括：一預充電整流電路220、一預充電電阻Rp、一壓敏電阻(Varistor)Rv、一開關260、一主整流電路230、一電容器Cb與一控制電路240，本發明電路應用到變頻器200時還包括：一驅動電路250。其中，壓敏電阻Rv的電阻值會隨著 兩端的電壓不同而改變，當壓敏電阻Rv兩端為高電壓(例如雷擊電壓)時，壓敏電阻Rv具有低電阻值的特性；反之，壓敏電阻Rv的電阻值會非常高。 Please refer to FIG. 2A, which is a schematic diagram of the circuit of the present invention applied to a frequency converter. When the circuit of the present invention is applied to the frequency converter 200, it can be connected to a load (not shown). The circuit of the present invention comprises: a pre-charge rectifier circuit 220, a pre-charge resistor Rp, a varistor Rv, and a switch 260. A main rectifier circuit 230, a capacitor Cb and a control circuit 240, when the circuit of the present invention is applied to the frequency converter 200, further includes a driving circuit 250. Wherein, the resistance value of the varistor Rv will follow The voltages at both ends are different. When the varistor Rv is high voltage (for example, lightning strike voltage), the varistor Rv has a low resistance value; on the contrary, the varistor Rv has a very high resistance value.
如第2A圖所示，三相交流電源R、S、T連接至主整流電路230的三個交流輸入端，主整流電路230的直流輸出端連接至節點o。 As shown in FIG. 2A, the three-phase AC power sources R, S, T are connected to the three AC input terminals of the main rectifier circuit 230, and the DC output terminals of the main rectifier circuit 230 are connected to the node o.
再者，三相交流電源R、S、T連接至預充電整流電路220的三個交流輸入端，預充電整流電路220的直流輸出端連接至預充電電阻Rp的第一端以及壓敏電阻Rv的第一端。開關260的第一端a連接至預充電電阻Rp的第二端，開關260的第二端b連接至壓敏電阻Rv的第二端，開關260的第三端c連接至節點o，開關260的控制端接收第一控制信號Sc1。其中，當第一控制信號Sc1未動作時，開關260的第一端a連接至第三端c；當第一控制信號Sc1動作時，開關260的第二端b連接至第三端c。 Furthermore, the three-phase AC power sources R, S, T are connected to three AC input terminals of the pre-charge rectifier circuit 220, and the DC output terminal of the pre-charge rectifier circuit 220 is connected to the first terminal of the pre-charge resistor Rp and the varistor Rv. The first end. The first end a of the switch 260 is connected to the second end of the pre-charging resistor Rp, the second end b of the switch 260 is connected to the second end of the varistor Rv, and the third end c of the switch 260 is connected to the node o, the switch 260 The control terminal receives the first control signal Sc1. Wherein, when the first control signal Sc1 is not active, the first end a of the switch 260 is connected to the third end c; when the first control signal Sc1 is actuated, the second end b of the switch 260 is connected to the third end c.
另外，電容器Cb、控制電路240與驅動電路250連接於節點o與接地端Gnd之間。控制電路240可輸出第一控制信號Sc1至開關260，控制電路240更可輸出一控制信號組(包括三個控制信號Sc2~Sc4)至主整流電路230，用以控制主整流電路230。另外，控制電路240也可以產生一驅動信號組(包括多個驅動信號Sd1~Sd6)至驅動電路250，用以控制驅動電路250多個輸出端上的輸出信號Va、Vb、Vc。 Further, the capacitor Cb, the control circuit 240, and the drive circuit 250 are connected between the node o and the ground terminal Gnd. The control circuit 240 can output the first control signal Sc1 to the switch 260. The control circuit 240 can further output a control signal group (including three control signals Sc2 to Sc4) to the main rectifier circuit 230 for controlling the main rectifier circuit 230. In addition, the control circuit 240 can also generate a driving signal group (including a plurality of driving signals Sd1 to Sd6) to the driving circuit 250 for controlling the output signals Va, Vb, Vc at the plurality of output ends of the driving circuit 250.
根據本發明的實施例，第一控制信號Sc1尚未動作時，開關260將預充電電阻Rp連接至節點o；第一控制信號Sc1動作時，開關260將壓敏電阻Rv連接至節點o。再者，三個控制信號Sc2~Sc4尚未動作時，主整流電路230無法運作；三個控制信號Sc2~Sc4動作時，主整流電路230正常運作。 According to an embodiment of the invention, when the first control signal Sc1 has not been actuated, the switch 260 connects the pre-charge resistor Rp to the node o; when the first control signal Sc1 is actuated, the switch 260 connects the varistor Rv to the node o. Furthermore, when the three control signals Sc2 to Sc4 have not been operated, the main rectifier circuit 230 cannot operate; when the three control signals Sc2 to Sc4 operate, the main rectifier circuit 230 operates normally.
根據本發明實施例，當三相交流電源R、S、T剛供應至變頻器200時，控制電路240尚未正常運作。因此，第一控制信號Sc1未動作，開關260的第一端a連接至第三端c；另三個控制信號Sc2~Sc4未動作，主整流電路230無法運作。 According to an embodiment of the present invention, when the three-phase AC power sources R, S, T are just supplied to the frequency converter 200, the control circuit 240 has not been operating normally. Therefore, the first control signal Sc1 is not activated, the first end a of the switch 260 is connected to the third terminal c; the other three control signals Sc2 to Sc4 are not operated, and the main rectifier circuit 230 is inoperable.
此時，三相交流電源R、S、T供應至預充電電路220的三個交流輸入端，而預充電整流電路220的直流輸出端產生直流電壓(DC voltage)，經由預充電電阻Rp對電容器Cb充電。而電容器Cb上的電壓充電到達穩態電壓Vdc之前，控制電路240無法正常運作。 At this time, the three-phase AC power sources R, S, T are supplied to the three AC input terminals of the precharge circuit 220, and the DC output terminal of the precharge rectifier circuit 220 generates a DC voltage, and the capacitor is charged via the precharge resistor Rp. Cb charging. The control circuit 240 does not operate normally until the voltage on the capacitor Cb is charged to reach the steady state voltage Vdc.
當預充電整流電路220對電容器Cb充電至穩態電壓Vdc之後，控制電路240開始正常運作，並動作所有的控制信號Sc1~Sc4。因此，開關260的第二端b連接至第三端c；並且主整流電路230正常運作。 After the precharge rectifier circuit 220 charges the capacitor Cb to the steady state voltage Vdc, the control circuit 240 begins normal operation and operates all of the control signals Sc1 to Sc4. Therefore, the second end b of the switch 260 is connected to the third end c; and the main rectifying circuit 230 operates normally.
當第一控制信號Sc1動作後，由於預充電整流電路220的直流輸出端與節點o之間連接壓敏電阻Rv，且預充電整流電路220直流輸出端所產生的直流電壓不大，使得壓敏電阻Rv具高電阻值，而預充電整流電路220的直流輸出端與節點o之間 可視為開路(open circuit)。 After the first control signal Sc1 is actuated, since the varistor Rv is connected between the DC output terminal of the precharge rectifier circuit 220 and the node o, and the DC voltage generated by the DC output terminal of the precharge rectifier circuit 220 is not large, the pressure sensitive The resistor Rv has a high resistance value, and the DC output terminal of the precharge rectifier circuit 220 is connected to the node o Can be regarded as an open circuit.
再者，當另外三個控制信號Sc2~Sc4動作後，主整流電路230正常運作。此時，主整流電路230的三個交流輸入端接收三相交流電源R、S、T，且主整流電路230的直流輸出端產生穩態電壓Vdc至電容器Cb。 Furthermore, after the other three control signals Sc2 to Sc4 are activated, the main rectifier circuit 230 operates normally. At this time, the three AC input terminals of the main rectifier circuit 230 receive the three-phase AC power sources R, S, T, and the DC output terminal of the main rectifier circuit 230 generates the steady state voltage Vdc to the capacitor Cb.
另外，第1B圖的驅動電路150可運用於第2A圖的驅動電路250。因此，控制電路240正常運作時，利用驅動信號Sd1~Sd6來控制對應電晶體Q1~Q6的開啟(turn on)或關閉(turn off)，並進一步控制輸出信號Va、Vb、Vc的波形(waveform)，以控制負載(例如三相直流馬達)的運作。 Further, the drive circuit 150 of Fig. 1B can be applied to the drive circuit 250 of Fig. 2A. Therefore, when the control circuit 240 operates normally, the drive signals Sd1 to Sd6 are used to control the turn-on or turn-off of the corresponding transistors Q1 to Q6, and further control the waveforms of the output signals Va, Vb, and Vc (waveform) ) to control the operation of the load (such as a three-phase DC motor).
請參照第2B圖，其所繪示主整流電路230的電路示意圖。主整流電路230中包括三個二極體D1~D3以及三個矽控整流器(SCR)Ds1~Ds3。第一二極體D1陽極端連接至接地端Gnd，陰極端連接至節點p。第二二極體D2陽極端連接至接地端Gnd，陰極端連接至節點q。第三二極體D3陽極端連接至接地端Gnd，陰極端連接至節點r。 Please refer to FIG. 2B , which illustrates a circuit diagram of the main rectifier circuit 230 . The main rectifier circuit 230 includes three diodes D1 to D3 and three step-controlled rectifiers (SCR) Ds1 to Ds3. The anode end of the first diode D1 is connected to the ground terminal Gnd, and the cathode end is connected to the node p. The anode end of the second diode D2 is connected to the ground terminal Gnd, and the cathode terminal is connected to the node q. The anode terminal of the third diode D3 is connected to the ground terminal Gnd, and the cathode terminal is connected to the node r.
第一矽控整流器Ds1陽極端連接至節點p，陰極端連接至節點o，閘控端(gate)接收第二控制信號Sc2。第二矽控整流器Ds2陽極端連接至節點q，陰極端連接至節點o，閘控端接收第三控制信號Sc3。第三矽控整流器Ds3陽極端連接至節點r，陰極端連接至節點o，閘控端接收第四控制信號Sc4。再者，節點p、q、r連接至三相交流電源R、S、T。 The anode terminal of the first pilot rectifier Ds1 is connected to the node p, the cathode terminal is connected to the node o, and the gate terminal receives the second control signal Sc2. The anode terminal of the second voltage controlled rectifier Ds2 is connected to the node q, the cathode terminal is connected to the node o, and the gate terminal receives the third control signal Sc3. The anode terminal of the third voltage controlled rectifier Ds3 is connected to the node r, the cathode terminal is connected to the node o, and the gate terminal receives the fourth control signal Sc4. Furthermore, the nodes p, q, r are connected to the three-phase AC power sources R, S, T.
當三個控制信號Sc2~Sc4動作時，三個矽控整流器Ds1~Ds3即開始運作，使得主整流電路230正常運作，並整流三相交流電源R、S、T。 When the three control signals Sc2~Sc4 are activated, the three step-controlled rectifiers Ds1~Ds3 start to operate, so that the main rectifier circuit 230 operates normally and rectifies the three-phase AC power sources R, S, T.
一般來說，矽控整流器的最高耐壓大約為1.4KV，而雷擊測試時的雷擊電壓約為4KV。因此，雷擊電壓可能會燒毀主整流電路230中的三個矽控整流器Ds1~Ds3。 In general, the maximum withstand voltage of the controlled rectifier is about 1.4KV, and the lightning strike voltage during lightning test is about 4KV. Therefore, the lightning strike voltage may burn the three pilot rectifiers Ds1~Ds3 in the main rectifier circuit 230.
本發明的電路中，設計壓敏電阻Rv連接於預充電整流電路220的直流輸出端以及節點o之間。當變頻器200正常運作時，由於壓敏電阻Rv二端上的電壓很小，所以壓敏電阻Rv的電阻值很高，預充電整流電路220的直流輸出端與節點o之間可視為開路。 In the circuit of the present invention, the varistor Rv is designed to be connected between the DC output terminal of the precharge rectifier circuit 220 and the node o. When the inverter 200 operates normally, since the voltage on the two ends of the varistor Rv is small, the resistance value of the varistor Rv is high, and the DC output terminal of the pre-charge rectifier circuit 220 and the node o can be regarded as an open circuit.
於變頻器200進行雷極測試時，約4KV的雷極電壓(surge voltage)將會使得壓敏電阻Rv的電阻值變很低，此時預充電整流電路220的直流輸出端與節點o之間可視為短路(short circuit)。 When the inverter 200 performs the lightning pole test, a surge voltage of about 4 kV will cause the resistance value of the varistor Rv to become very low. At this time, between the DC output terminal of the precharge rectifier circuit 220 and the node o. Can be regarded as a short circuit.
因此，雷極電壓所產生的大電流中，一大部分電流會經由預充電整流電路220、壓敏電阻Rv傳遞至電容器Cb；而另一小部分電流會經由主整流電路230傳遞至電容器Cb。所以主整流電路230中的三個矽控整流器Ds1~Ds3不會被燒毀，主整流電路230仍可以正常運作，並通過雷極測試。 Therefore, a large part of the large current generated by the lightning pole voltage is transmitted to the capacitor Cb via the precharge rectifier circuit 220 and the varistor Rv; and another small portion of the current is transmitted to the capacitor Cb via the main rectifier circuit 230. Therefore, the three pilot rectifiers Ds1~Ds3 in the main rectifier circuit 230 are not burned, and the main rectifier circuit 230 can still operate normally and pass the lightning pole test.
由以上的說明可知，應用本發明電路的變頻器200中並未使用到電磁接觸器，所以可以減少變頻器200的體積。再 者，於控制電路240正常運作時，利用開關260將壓敏電阻Rv連接至節點o。當變頻器200遭遇雷擊電壓時，所產生的大電流可以有效地經由壓敏電阻Rv而傳遞至電容器Cb，而不會造成主整流電路的損毀，應用本發明電路的變頻器具備雷擊保護能力。 As apparent from the above description, the electromagnetic contactor is not used in the inverter 200 to which the circuit of the present invention is applied, so that the volume of the inverter 200 can be reduced. again When the control circuit 240 is operating normally, the varistor Rv is connected to the node o by the switch 260. When the frequency converter 200 encounters a lightning strike voltage, the generated large current can be effectively transmitted to the capacitor Cb via the varistor Rv without causing damage to the main rectifier circuit, and the frequency converter applying the circuit of the present invention has lightning protection capability.
綜上所述，雖然本發明已以較佳實施例揭露如上，然其並非用以限定本發明。本發明所屬技術領域中具有通常知識者，在不脫離本發明之精神和範圍內，當可作各種之更動與潤飾。因此，本發明之保護範圍當視後附之申請專利範圍所界定者為準。 In conclusion, the present invention has been disclosed in the above preferred embodiments, and is not intended to limit the present invention. A person skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.
200‧‧‧變頻器 200‧‧‧Inverter
220‧‧‧預充電整流電路 220‧‧‧Precharge rectifier circuit
230‧‧‧主整流電路 230‧‧‧Main rectifier circuit
240‧‧‧控制電路 240‧‧‧Control circuit
250‧‧‧驅動電路 250‧‧‧ drive circuit
260‧‧‧開關 260‧‧‧ switch
Claims (6)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW105119301A TWI597911B (en) | 2016-06-20 | 2016-06-20 | Circuit with surge protection ability |
| JP2016170016A JP6186060B1 (en) | 2016-06-20 | 2016-08-31 | Protection circuit with surge protection function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW105119301A TWI597911B (en) | 2016-06-20 | 2016-06-20 | Circuit with surge protection ability |
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| TWI597911B true TWI597911B (en) | 2017-09-01 |
| TW201801433A TW201801433A (en) | 2018-01-01 |
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| TW105119301A TWI597911B (en) | 2016-06-20 | 2016-06-20 | Circuit with surge protection ability |
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| TW (1) | TWI597911B (en) |
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| WO2021111492A1 (en) | 2019-12-02 | 2021-06-10 | 三菱電機株式会社 | Display control device and display control method |
| JP7445549B2 (en) | 2020-07-13 | 2024-03-07 | シーシーエス株式会社 | Measured data display device, measured data display method, and program for measured data display device |
| TWI783536B (en) | 2021-06-21 | 2022-11-11 | 群光電能科技股份有限公司 | Power supply with lightning protection |
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| JP2006269299A (en) * | 2005-03-24 | 2006-10-05 | Lecip Corp | Discharge lamp lighting circuit |
| JP4335871B2 (en) * | 2005-12-27 | 2009-09-30 | 新電元工業株式会社 | Switching power supply device and surge absorption circuit |
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| TW201801433A (en) | 2018-01-01 |
| JP6186060B1 (en) | 2017-08-23 |
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