TW201836229A - Drive apparatus and power supply reverse connection protection circuit thereof being suitable for being electrically connected between a high-voltage power supply and an inverter - Google Patents

Drive apparatus and power supply reverse connection protection circuit thereof being suitable for being electrically connected between a high-voltage power supply and an inverter Download PDF

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TW201836229A
TW201836229A TW106109086A TW106109086A TW201836229A TW 201836229 A TW201836229 A TW 201836229A TW 106109086 A TW106109086 A TW 106109086A TW 106109086 A TW106109086 A TW 106109086A TW 201836229 A TW201836229 A TW 201836229A
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voltage
electrically connected
power supply
relay
inverter
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TW106109086A
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TWI625909B (en
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陳仁和
苟崴第
王皓冀
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上海騏宏電驅動科技有限公司
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Abstract

A power supply reverse connection protection circuit is suitable for being electrically connected between a high-voltage power supply and an inverter, wherein the high-voltage power supply is used to provide a direct-current voltage. A polarity detecting unit is electrically connected with the high-voltage power supply to detect the direct-current voltage, and generate a detected voltage signal a magnitude of which is related to the polarity of the direct-current voltage according to the polarity of the direct-current voltage and the detected voltage. A determining unit is electrically connected with the polarity detecting unit to receive the detected voltage signal, obtain a determination result according to a comparison between a default value and the magnitude of the detected voltage signal, and generate a control signal switched between an on level and an off level according to the determination result. A relay unit is electrically connected with the high-voltage power supply to receive the direct-current voltage, electrically connected with the determining unit to receive the control signal, and controlled by the control signal to determine whether to output the direct-current voltage to the inverter.

Description

驅動裝置及其電源反接保護電路Drive device and its power supply reverse connection protection circuit

本發明是有關於一種驅動裝置，特別是指一種具電源反接保護功能的驅動裝置及其電源反接保護電路。The invention relates to a driving device, in particular to a driving device with a reverse power protection function and a power reverse connection protection circuit.

現有技術應用於驅動馬達中的逆變器的輸入電源為高電壓之直流電源，若因人為或其他因素導致接頭反接，則可能造成逆變器損壞，因此，如何判斷電源是否反接是未來的研究方向。The input power applied to the inverter in the drive motor is a high-voltage DC power supply. If the connector is reversed due to human factors or other factors, the inverter may be damaged. Therefore, how to determine whether the power supply is reversed is the future. Research direction.

因此，本發明之目的，即在提供一種判斷出電源極性是否正確的驅動裝置。Accordingly, it is an object of the present invention to provide a drive device that determines whether the polarity of the power source is correct.

於是，本發明驅動裝置包含一電源反接保護電路及一逆變器。Therefore, the driving device of the present invention comprises a power reverse connection protection circuit and an inverter.

該電源反接保護電路包括一極性偵測單元、一判斷單元及一繼電單元。The power reverse connection protection circuit comprises a polarity detecting unit, a determining unit and a relay unit.

該極性偵測單元電連接該高壓電源以偵測該直流電壓，且根據該直流電壓的極性與該測試電壓，產生一大小相關於該直流電壓的極性的偵測電壓信號。The polarity detecting unit is electrically connected to the high voltage power source to detect the DC voltage, and generates a detected voltage signal of a magnitude related to the polarity of the DC voltage according to the polarity of the DC voltage and the test voltage.

該判斷單元電連接該極性偵測單元以接收該偵測電壓信號，並根據一預設值與該偵測電壓信號的大小的比較得到一判斷結果，且根據該判斷結果產生一切換於一導通準位及一不導通準位間的控制信號。The determining unit is electrically connected to the polarity detecting unit to receive the detected voltage signal, and obtains a determination result according to a comparison between a preset value and the magnitude of the detected voltage signal, and generates a switch according to the determination result. Control signal between the level and a non-conduction level.

該繼電單元電連接該高壓電源以接收該直流電壓，且電連接該判斷單元以接收該控制信號，且受該控制信號控制以決定是否輸出該直流電壓。The relay unit is electrically connected to the high voltage power supply to receive the DC voltage, and is electrically connected to the determining unit to receive the control signal, and is controlled by the control signal to determine whether to output the DC voltage.

該逆變器電連接該繼電單元與該馬達之間，且當接收到來自該繼電單元的該直流電壓時，用以驅動該馬達。The inverter is electrically connected between the relay unit and the motor, and is configured to drive the motor when receiving the DC voltage from the relay unit.

本發明之功效在於：具電源反接保護功能以避免逆變器燒毀。The effect of the invention is that the power reverse connection protection function is used to avoid the inverter burning.

在本發明被詳細描述之前，應當注意在以下的說明內容中，類似的元件是以相同的編號來表示。Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same reference numerals.

參閱圖1，本發明具電源反接保護功能的驅動裝置之一實施例，適用於電連接一高壓電源1，高壓電源1具有二個用以提供一直流電壓的接頭，並驅動一馬達4，且該驅動裝置包含一電源反接保護電路2、一逆變器3及一直流電容Cdc。Referring to FIG. 1 , an embodiment of a driving device with a power reverse connection protection function is applied to electrically connect a high voltage power supply 1 . The high voltage power supply 1 has two connectors for providing a DC voltage and drives a motor 4 . The driving device comprises a power reverse connection protection circuit 2, an inverter 3 and a DC capacitor Cdc.

該電源反接保護電路2包括一極性偵測單元21、一繼電單元23及一判斷單元22。The power reverse connection protection circuit 2 includes a polarity detecting unit 21, a relay unit 23, and a determining unit 22.

極性偵測單元21電連接該高壓電源1以偵測該直流電壓，且根據該直流電壓的極性與該測試電壓，產生一大小相關於該直流電壓的極性的偵測電壓信號。該極性偵測單元21包括二個輸入端i、一個二極體D、一開關S、一第二電阻R2、一第一電容C1、一第三電阻R3、一第二電容C2、一第三電容C3及一差分放大器5。The polarity detecting unit 21 is electrically connected to the high voltage power source 1 to detect the DC voltage, and generates a detecting voltage signal of a magnitude related to the polarity of the DC voltage according to the polarity of the DC voltage and the test voltage. The polarity detecting unit 21 includes two input terminals i, a diode D, a switch S, a second resistor R2, a first capacitor C1, a third resistor R3, a second capacitor C2, and a third Capacitor C3 and a differential amplifier 5.

二個輸入端i分別電連接該高壓電源1的二端。第二電阻具有一電連接該二輸入端的一相對應者的第一端及一第二端。開關具有一電連接該第二電阻的第二端的第一端及一第二端，且受控制切換於導通與不導通間。第一電容具有一電連接該開關的第二端的第一端及一第二端。第二電容具有一電連接該該開關的第二端的第一端及一接收該第一電壓（在本實施例為接地GND，電壓準位是0）的第二端。第三電容具有接收該第一電壓的第一端，及一電連接該二輸入端的一相對應者的第二端。二極體具有一電連接該第一電容的第二端的陽極及一陰極。第三電阻具有電連接該二極體的陰極的第一端，及一接收一第一電壓的第二端。差分放大器5具有一電連接該第三電阻R3的第一端的非反相輸入端（＋）、一接收該第一電壓的反相輸入端（－），及一提供該偵測電壓信號的輸出端。The two input terminals i are electrically connected to the two ends of the high voltage power source 1, respectively. The second resistor has a first end and a second end of a corresponding one electrically connected to the two inputs. The switch has a first end and a second end electrically connected to the second end of the second resistor, and is controlled to be switched between conducting and non-conducting. The first capacitor has a first end and a second end electrically connected to the second end of the switch. The second capacitor has a first end electrically connected to the second end of the switch and a second end receiving the first voltage (in the embodiment, the ground GND, the voltage level is 0). The third capacitor has a first end that receives the first voltage, and a second end that is electrically connected to a corresponding one of the two inputs. The diode has an anode electrically connected to the second end of the first capacitor and a cathode. The third resistor has a first end electrically connected to the cathode of the diode and a second end receiving a first voltage. The differential amplifier 5 has a non-inverting input terminal (+) electrically connected to the first end of the third resistor R3, an inverting input terminal (-) receiving the first voltage, and a detecting voltage signal. Output.

判斷單元22電連接該極性偵測單元21以接收該偵測電壓信號，並根據一預設值與該偵測電壓信號的大小的比較得到一判斷結果，且根據該判斷結果產生一切換於一導通準位及一不導通準位間的控制信號。該判斷單元22包括一比較器6及一微處理器MCU，該比較器6具有一接收該偵測電壓信號的非反相輸入端（＋）、一接收一正比於該預設值的臨界電壓的反相輸入端（－），及一提供一輸出的輸出端。微處理器MCU電連接該比較器6的輸出端以接收該比較器6的輸出，且根據該比較器6的輸出產生一控制信號，當該偵測電壓信號的大小於一預定時間區間內大於該臨界電壓時，該控制信號處於該導通準位，反之，該控制信號處於該不導通準位。The determining unit 22 is electrically connected to the polarity detecting unit 21 to receive the detected voltage signal, and obtains a determination result according to a comparison between a preset value and the magnitude of the detected voltage signal, and generates a switch according to the determination result. A control signal between the conduction level and a non-conduction level. The determining unit 22 includes a comparator 6 and a microprocessor MCU. The comparator 6 has a non-inverting input terminal (+) for receiving the detected voltage signal, and receives a threshold voltage proportional to the preset value. The inverting input (-), and an output providing an output. The microprocessor MCU is electrically connected to the output of the comparator 6 to receive the output of the comparator 6, and generates a control signal according to the output of the comparator 6, when the magnitude of the detected voltage signal is greater than a predetermined time interval. At the threshold voltage, the control signal is at the conduction level, and conversely, the control signal is at the non-conduction level.

繼電單元23電連接該高壓電源1以接收該直流電壓，且電連接該判斷單元22以接收該控制信號CTL，且受該控制信號CTL控制以決定是否輸出該直流電壓，該繼電單元23包括一繼電器25及一繼電驅動器24。The relay unit 23 is electrically connected to the high voltage power supply 1 to receive the DC voltage, and is electrically connected to the determining unit 22 to receive the control signal CTL, and is controlled by the control signal CTL to determine whether to output the DC voltage. The relay unit 23 A relay 25 and a relay driver 24 are included.

繼電器25電連接該高壓電源1與該逆變器3間，且受控制切換於導通與不導通間，當導通時，該繼電器25將來自該高壓電源的該直流電壓傳遞到該逆變器，當不導通時，該繼電器則不將來自該高壓電源的該直流電壓傳遞到該逆變器。繼電驅動器電連接該繼電器，且接收該控制信號，並根據該控制信號來控制該繼電器。The relay 25 is electrically connected between the high voltage power source 1 and the inverter 3, and is controlled to be switched between conduction and non-conduction. When turned on, the relay 25 transmits the DC voltage from the high voltage power source to the inverter. When not conducting, the relay does not pass the DC voltage from the high voltage power supply to the inverter. The relay driver electrically connects the relay and receives the control signal, and controls the relay according to the control signal.

逆變器電連接該繼電單元與該馬達之間，且當接收到來自該繼電單元的該直流電壓時，用以驅動該馬達。The inverter is electrically connected between the relay unit and the motor, and is used to drive the motor when receiving the DC voltage from the relay unit.

直流電容Cd具有一電連接該逆變器的第一端及一接地的第二端。The DC capacitor Cd has a first end electrically connected to the inverter and a second end connected to the ground.

如圖2所示，為上述實施例的信號量測圖，當時間=10ms時，且高壓電源的直流電壓預設為+50V，二極體導通，第三電阻R3的跨壓逐漸拉升，而使偵測電壓信號於一預定時間（18ms~90ms）內超過該臨界電壓（本案預設臨界電壓=2V，但不限於此），比較器6的輸出轉為高電位，比較器6的輸出的一上升緣進而使微處理器MCU的輸出控制信號CTL為高準位（也就是本案定義的導通準位），使繼電驅動器24控制該繼電器25切換為導通，使該直流電壓經由該繼電器25傳遞到該逆變器3。如圖3，當時間=10ms時，且高壓電源的直流電壓預設為－50V， 二極體D不導通，第三電阻R3的跨壓維持在0V，而使該偵測電壓信號不超過該臨界電壓，使比較器6的輸出與控制信號CTL皆為低準位（也就是本案定義的不導通準位，0V），使繼電驅動器24控制該繼電器25切換為不導通，使該直流電壓無法傳遞到該逆變器3。As shown in FIG. 2 , for the signal measurement diagram of the above embodiment, when the time is 10 ms, and the DC voltage of the high voltage power supply is preset to be +50 V, the diode is turned on, and the voltage across the third resistor R3 is gradually pulled up. And the detection voltage signal exceeds the threshold voltage within a predetermined time (18ms~90ms) (the preset threshold voltage is 2V, but not limited thereto), the output of the comparator 6 is turned to a high potential, and the output of the comparator 6 A rising edge further causes the output control signal CTL of the microprocessor MCU to be at a high level (that is, the conduction level defined in the present case), so that the relay driver 24 controls the relay 25 to be turned on, and the DC voltage is passed through the relay. 25 is passed to the inverter 3. As shown in FIG. 3, when the time is 10ms, and the DC voltage of the high voltage power supply is preset to -50V, the diode D is not turned on, and the voltage across the third resistor R3 is maintained at 0V, so that the detection voltage signal does not exceed the The threshold voltage causes the output of the comparator 6 and the control signal CTL to be at a low level (that is, the non-conduction level defined in the present case, 0V), so that the relay driver 24 controls the relay 25 to switch to non-conduction, so that the DC voltage is Cannot be passed to the inverter 3.

綜上所述，上述實施例具有以下優點：In summary, the above embodiment has the following advantages:

1.利用極性偵測單元21和判斷單元22，可判斷出電源極性是否正確，若電源極性不正確則禁止高壓電源供電給逆變器3，以避免逆變器3燒毀。1. Using the polarity detecting unit 21 and the determining unit 22, it can be determined whether the polarity of the power source is correct. If the polarity of the power source is not correct, the high voltage power supply is prohibited from being supplied to the inverter 3 to prevent the inverter 3 from being burnt.

2.僅使用第一電容C1、第二電容C2、第三電容C3即可達到差分放大器5和判斷單元22隔離於高壓電源的偵測效果，可滿足與高壓直流電源兩端絕緣要求。2. Only the first capacitor C1, the second capacitor C2, and the third capacitor C3 can be used to achieve the detection effect of the differential amplifier 5 and the judging unit 22 isolated from the high voltage power supply, which can meet the requirements for insulation between the two ends of the high voltage DC power supply.

3. 極性偵測單元21和判斷單元22可獨立於繼電單元23和直流電容Cdc，由於繼電單元23在一般系統已具備，因此無需額外損耗元件，故確實能達成本發明之目的。3. The polarity detecting unit 21 and the determining unit 22 can be independent of the relay unit 23 and the DC capacitor Cdc. Since the relay unit 23 is already provided in the general system, there is no need to additionally loss the components, so the object of the present invention can be achieved.

惟以上所述者，僅為本發明之實施例而已，當不能以此限定本發明實施之範圍，凡是依本發明申請專利範圍及專利說明書內容所作之簡單的等效變化與修飾，皆仍屬本發明專利涵蓋之範圍內。However, the above is only the embodiment of the present invention, and the scope of the invention is not limited thereto, and all the equivalent equivalent changes and modifications according to the scope of the patent application and the patent specification of the present invention are still The scope of the invention is covered.

1‧‧‧高壓電源 1‧‧‧High voltage power supply

2‧‧‧電源反接保護電路2‧‧‧Power reverse connection protection circuit

21‧‧‧極性偵測單元21‧‧‧Polarity detection unit

i‧‧‧輸入端I‧‧‧ input

R2‧‧‧第二電阻R2‧‧‧second resistance

R3‧‧‧第三電阻R3‧‧‧ third resistor

R4‧‧‧第四電阻R4‧‧‧fourth resistor

C1‧‧‧第一電容C1‧‧‧first capacitor

C2‧‧‧第二電容C2‧‧‧second capacitor

C3‧‧‧第三電容C3‧‧‧ third capacitor

D‧‧‧二極體D‧‧‧ diode

22‧‧‧判斷單元22‧‧‧judging unit

MCU‧‧‧微處理器MCU‧‧‧Microprocessor

23‧‧‧繼電單元23‧‧‧ Relay unit

24‧‧‧繼電驅動器24‧‧‧ Relay Driver

25‧‧‧繼電器25‧‧‧ Relay

3‧‧‧逆變器3‧‧‧Inverter

4‧‧‧馬達4‧‧‧Motor

5‧‧‧差分放大器5‧‧‧Differential Amplifier

6‧‧‧運算放大器6‧‧‧Operational Amplifier

Cdc‧‧‧直流電容Cdc‧‧‧ DC Capacitor

CTL‧‧‧控制信號CTL‧‧‧ control signal

本發明之其他的特徵及功效，將於參照圖式的實施方式中清楚地呈現，其中： 圖1是本發明具電源反接保護功能的驅動裝置之一實施例的一電路圖； 圖2是該實施例的一信號量測圖；及 圖3是該實施例的另一信號量測圖。Other features and effects of the present invention will be apparent from the embodiments of the present invention, wherein: FIG. 1 is a circuit diagram of an embodiment of a driving device with a reverse power protection function of the present invention; A signal measurement diagram of an embodiment; and Figure 3 is another signal measurement diagram of the embodiment.

Claims (8)

一種具電源反接保護功能的驅動裝置，適用於電連接一提供一直流電壓的高壓電源，並驅動一馬達，且該驅動裝置包含： 一電源反接保護電路，包括： 一極性偵測單元，電連接該高壓電源以偵測該直流電壓，且根據該直流電壓的極性與該測試電壓，產生一大小相關於該直流電壓的極性的偵測電壓信號； 一判斷單元，電連接該極性偵測單元以接收該偵測電壓信號，並根據一預設值與該偵測電壓信號的大小的比較得到一判斷結果，且根據該判斷結果產生一切換於一導通準位及一不導通準位間的控制信號， 一繼電單元，電連接該高壓電源以接收該直流電壓，且電連接該判斷單元以接收該控制信號，且受該控制信號控制以決定是否輸出該直流電壓， 一逆變器，電連接該繼電單元與該馬達之間，且當接收到來自該繼電單元的該直流電壓時，用以驅動該馬達。The utility model relates to a driving device with a power reverse connection protection function, which is suitable for electrically connecting a high voltage power supply providing a DC voltage and driving a motor, and the driving device comprises: a power reverse connection protection circuit, comprising: a polarity detecting unit, Electrically connecting the high voltage power supply to detect the DC voltage, and according to the polarity of the DC voltage and the test voltage, generating a detection voltage signal of a magnitude related to the polarity of the DC voltage; a determining unit electrically connecting the polarity detection The unit receives the detection voltage signal, and obtains a determination result according to a comparison between a preset value and the magnitude of the detection voltage signal, and generates a switch between a conduction level and a non-conduction level according to the determination result. Control signal, a relay unit electrically connected to the high voltage power supply to receive the DC voltage, and electrically connected to the determining unit to receive the control signal, and controlled by the control signal to determine whether to output the DC voltage, an inverter Electrically connecting the relay unit to the motor and driving the horse when receiving the DC voltage from the relay unit . 如請求項1所述的驅動裝置，其中，該極性偵測單元包括： 二個輸入端，分別電連接該高壓電源的二端； 一第二電阻，具有一電連接該二輸入端的一相對應者的第一端及一第二端； 一開關，具有一電連接該第二電阻的第二端的第一端及一第二端，且受控制切換於導通與不導通間； 一第一電容，具有一電連接該開關的第二端的第一端及一第二端； 一第二電容，具有一電連接該該開關的第二端的第一端及一接收該第一電壓的第二端； 一第三電容，具有接收該第一電壓的第一端，及一電連接該二輸入端的一相對應者的第二端； 一個二極體，具有一電連接該第一電容的第二端的陽極及一陰極；及 一第三電阻，具有電連接該二極體的陰極的第一端，及一接收一第一電壓的第二端。The driving device of claim 1, wherein the polarity detecting unit comprises: two input ends electrically connected to the two ends of the high voltage power supply; and a second resistor having a corresponding one electrically connected to the two input ends a first end and a second end; a switch having a first end and a second end electrically connected to the second end of the second resistor, and controlled to be switched between conducting and non-conducting; a first end and a second end electrically connected to the second end of the switch; a second capacitor having a first end electrically connected to the second end of the switch and a second end receiving the first voltage a third capacitor having a first end receiving the first voltage and a second end electrically connected to a corresponding one of the two inputs; a diode having a second electrically connected to the first capacitor An anode and a cathode; and a third resistor having a first end electrically connected to the cathode of the diode and a second end receiving a first voltage. 如請求項2所述的驅動裝置，其中，該極性偵測單元更包括： 一差分放大器，具有一電連接該第三電阻的第一端的非反相輸入端、一接收該第一電壓的反相輸入端，及一提供該偵測電壓信號的輸出端。The driving device of claim 2, wherein the polarity detecting unit further comprises: a differential amplifier having a non-inverting input terminal electrically connected to the first end of the third resistor, and receiving the first voltage An inverting input terminal and an output terminal for providing the detected voltage signal. 如請求項1所述的驅動裝置，其中，該繼電單元包括： 一繼電器，電連接該高壓電源與該逆變器間，且受控制切換於導通與不導通間，當導通時，該繼電器將來自該高壓電源的該直流電壓傳遞到該逆變器，當不導通時，該繼電器則不將來自該高壓電源的該直流電壓傳遞到該逆變器；及 一繼電驅動器，電連接該繼電器，且接收該控制信號，並根據該控制信號來控制該繼電器。The driving device of claim 1, wherein the relay unit comprises: a relay electrically connected between the high voltage power source and the inverter, and controlled to switch between conduction and non-conduction, and when conducting, the relay Transmitting the DC voltage from the high voltage power source to the inverter, when not conducting, the relay does not transmit the DC voltage from the high voltage power source to the inverter; and a relay driver electrically connecting the a relay, and receiving the control signal, and controlling the relay according to the control signal. 一種電源反接保護電路，適用於電連接於一高壓電源與一逆變器間，該高壓電源用以提供一直流電壓，且該電源反接保護電路包含： 一極性偵測單元，電連接該高壓電源以偵測該直流電壓，且根據該直流電壓的極性與該測試電壓，產生一大小相關於該直流電壓的極性的偵測電壓信號； 一判斷單元，電連接該極性偵測單元以接收該偵測電壓信號，並根據一預設值與該偵測電壓信號的大小的比較得到一判斷結果，且根據該判斷結果產生一切換於一導通準位及一不導通準位間的控制信號；及 一繼電單元，電連接該高壓電源以接收該直流電壓，且電連接該判斷單元以接收該控制信號，且受該控制信號控制以決定是否輸出該直流電壓到該逆變器。A power reverse connection protection circuit is configured to be electrically connected between a high voltage power supply and an inverter, wherein the high voltage power supply is used to provide a DC voltage, and the power reverse connection protection circuit comprises: a polarity detection unit electrically connected to the a high voltage power supply for detecting the DC voltage, and generating a detection voltage signal of a magnitude related to the polarity of the DC voltage according to the polarity of the DC voltage and the test voltage; a determining unit electrically connecting the polarity detecting unit to receive Detecting the voltage signal, and obtaining a determination result according to a comparison between a preset value and the magnitude of the detected voltage signal, and generating a control signal switched between a conduction level and a non-conduction level according to the determination result. And a relay unit electrically connected to the high voltage power supply to receive the DC voltage, and electrically connected to the determining unit to receive the control signal, and controlled by the control signal to determine whether to output the DC voltage to the inverter. 如請求項5所述的電源反接保護電路，其中，該極性偵測單元包括： 二個輸入端，分別電連接該高壓電源的二端； 一第二電阻，具有一電連接該二輸入端的一相對應者的第一端及一第二端； 一開關，具有一電連接該第二電阻的第二端的第一端及一第二端，且受控制切換於導通與不導通間； 一第一電容，具有一電連接該開關的第二端的第一端及一第二端； 一第二電容，具有一電連接該該開關的第二端的第一端及一接收該第一電壓的第二端； 一第三電容，具有接收該第一電壓的第一端，及一電連接該二輸入端的一相對應者的第二端； 一個二極體，具有一電連接該第一電容的第二端的陽極及一陰極；及 一第三電阻，具有電連接該二極體的陰極的第一端，及一接收一第一電壓的第二端。The power reverse connection protection circuit of claim 5, wherein the polarity detecting unit comprises: two input ends electrically connected to the two ends of the high voltage power supply; and a second resistor having an electrical connection between the two input ends a first end and a second end of a corresponding one; a switch having a first end and a second end electrically connected to the second end of the second resistor, and controlled to be switched between conducting and non-conducting; a first capacitor having a first end and a second end electrically connected to the second end of the switch; a second capacitor having a first end electrically connected to the second end of the switch and a receiving the first voltage a second end; a third capacitor having a first end receiving the first voltage, and a second end electrically connected to a corresponding one of the two inputs; a diode having an electrical connection to the first capacitor The second end of the anode and a cathode; and a third resistor having a first end electrically connected to the cathode of the diode and a second end receiving a first voltage. 如請求項6所述的電源反接保護電路，其中，該極性偵測單元更包括： 一差分放大器，具有一電連接該第三電阻的第二端的非反相輸入端、一接收該第一電壓的反相輸入端，及一提供該偵測電壓信號的輸出端。The power reverse connection protection circuit of claim 6, wherein the polarity detecting unit further comprises: a differential amplifier having a non-inverting input terminal electrically connected to the second end of the third resistor, and receiving the first An inverting input of the voltage, and an output providing the detected voltage signal. 如請求項5所述的電源反接保護電路，其中，該繼電單元包括： 一繼電器，電連接該高壓電源與該逆變器間，且受控制切換於導通與不導通間，當導通時，該繼電器將來自該高壓電源的該直流電壓傳遞到該逆變器，當不導通時，該繼電器則不將來自該高壓電源的該直流電壓傳遞到該逆變器；及 一繼電驅動器，電連接該繼電器，且接收該控制信號，並根據該控制信號來控制該繼電器。The power reverse connection protection circuit of claim 5, wherein the relay unit comprises: a relay electrically connected between the high voltage power supply and the inverter, and controlled to switch between conduction and non-conduction, when conducting The relay transmits the DC voltage from the high voltage power supply to the inverter. When not conducting, the relay does not transmit the DC voltage from the high voltage power supply to the inverter; and a relay driver, The relay is electrically connected, and the control signal is received, and the relay is controlled according to the control signal.
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