TW202202390A - Leakage current detection device for switch - Google Patents

Abstract

A switch leakage current detection device is provided in the present disclosure. A first connection portion and a second connection portion of the switch leakage current detection device are electrically connected to both ends of a switching element, respectively. The switch leakage current detection device includes: a current detection control circuit and a current detection circuit. The current detection circuit detects a current value passing through the switching element. When the current value is greater than or equal to a predetermined value of the current, the current detection control circuit outputs a first control signal to the current detection circuit to the switch leakage current detection device, such that the switch leakage current detection device outputs an output signal to the load. When the current value is less than the current predetermined value, the current detection control circuit outputs a second control signal to the current detection circuit, such that the switching leakage current detection device does not output the output signal.

Description

Switch micro-leakage current detection device

The invention relates to a switch micro-leakage current detection device, in particular to a switch micro-leakage current detection device with simple circuit and convenient setting.

In the field of locomotive electrical equipment, since a locomotive will be equipped with multiple switching elements, and most locomotives are parked in outdoor areas, they will experience wind and rain in the natural climate. If you add humidity and water vapor in the air. If the reliability of the switching element itself is low, leakage current may occur, and the switching element may malfunction.

Therefore, how to provide a switch micro-leakage current detection device with a simple circuit and convenient setting has become one of the important issues to be solved by this project.

The technical problem to be solved by the present invention is to provide a switch micro-leakage current detection device in view of the deficiencies of the prior art, which at least includes a first connection part, a second connection part and a signal output end, the first connection part and The second connection parts are electrically connected to two ends of a switch element respectively, and the switch micro-leakage current detection device includes: a current detection control circuit electrically connected to the first connection part; and a current detection a circuit electrically connected to the second connection part and the current detection control circuit, the current detection circuit detects a current value passing through the switching element, and when the current value is greater than or equal to a predetermined current value, The current detection control circuit outputs a first control signal to the current detection circuit, so that the switch micro-leakage current detection device outputs an output signal to a load, when the current value is less than the current When the predetermined value is set, the current detection control circuit outputs a second control signal to the current detection circuit, so that the switch micro-leakage current detection device does not output the output signal.

In order to solve the above-mentioned technical problems, one of the technical solutions adopted by the present invention is to provide a switch micro-leakage current detection device, which at least includes a first connection part, a second connection part, a power input end and a signal output end, The first connection portion and the second connection portion are respectively electrically connected to two ends of a switch element, and the switch micro-leakage current detection device includes: a current detection control circuit electrically connected to the first connection part; a current detection circuit electrically connected to the second connection part and the current detection control circuit, the current detection circuit detects a current value passing through the switching element; and an output switching element, A first end and a second end of the output switch element are respectively electrically connected to the power input end and the signal output end; wherein, when the current value is greater than or equal to a predetermined current value, the current detection The control circuit outputs a first control signal to an output switch element, so that the switch micro-leakage current detection device outputs an output signal to a load, when the current value is less than the predetermined current value, the current detection device The detection control circuit outputs a second control signal to the output switch element, so that the switch micro-leakage current detection device does not output the output signal.

In order to solve the above-mentioned technical problem, another technical solution adopted by the present invention is to provide a switch micro-leakage current detection device, which at least includes a first connection part, a second connection part, a third connection part, a first connection part, and a first connection part. Four connection parts, a power input end, a first signal output end and a second signal output end, the first connection part and the second connection part are respectively electrically connected to two ends of a first switching element, so The third connection portion and the fourth connection portion are respectively electrically connected to two ends of a second switch element. The switch micro-leakage current detection device includes: a first current detection control circuit electrically connected to the second switch element. a first connection part; a first current detection circuit electrically connected to the second connection part and the first current detection control circuit, the first current detection circuit detects through the first switch element a first current value of the A second current detection control circuit is electrically connected to the third connection part; a second current detection circuit is electrically connected to the fourth connection part and the second current detection control circuit, the second The current detection circuit detects a second current value passing through the second switch element; a second output switch element, a first end and a second end of the first output switch element are respectively electrically connected to the a power input terminal and the second signal output terminal; wherein, when the first current value is greater than or equal to a predetermined first current value, the first current detection control circuit outputs a first control signal to the first current an output switch element, so that the switch micro-leakage current detection device outputs a first output signal to a first load, when the first current value is less than the first predetermined value of the current, the first current detection device The detection control circuit outputs a second control signal to the first output switch element, so that the switch micro-leakage current detection device does not output the first output signal; wherein, when the second current value is greater than or equal to A second predetermined current value, the second current detection control circuit outputs a third control signal to the second output switch element, so that the switch micro-leakage current detection device outputs a second output signal to For a second load, when the second current value is smaller than the predetermined second current value, the second current detection control circuit outputs a fourth control signal to the second output switch element, so that the The switch micro-leakage current detection device does not output the second output signal.

In order to solve the above-mentioned technical problem, another technical solution adopted by the present invention is to provide a switch micro-leakage current detection device, which at least includes a first connection part, a second connection part, a third connection part, a first connection part, and a first connection part. Four connection parts, a power input end, a first signal output end and a second signal output end, the first connection part and the second connection part are respectively electrically connected to two ends of a first switching element, so The third connection portion and the fourth connection portion are respectively electrically connected to two ends of a second switch element. The switch micro-leakage current detection device includes: a first current detection control circuit electrically connected to the second switch element. a first connection part; a first current detection circuit electrically connected to the second connection part and the first current detection control circuit, the first current detection circuit detects through the first switch element a first current value of the A second current detection control circuit is electrically connected to the third connection part; a second current detection circuit is electrically connected to the fourth connection part and the second current detection control circuit, the second The current detection circuit detects a second current value passing through the second switch element; a second output switch element, a first end and a second end of the first output switch element are respectively electrically connected to the a power input end and the second signal output end; and a micro-control module electrically connected to the first current detection control circuit and the second current detection control circuit, and the micro-control module is electrically connected a third end of the first output switch element and a third end of the second output switch element; wherein, when the first current value is greater than or equal to a first predetermined current value, the first current detection The detection and control circuit outputs a first detection signal to the micro-control module, and the micro-control module provides a first output control signal to the first output switch element, so as to enable the switch micro-leakage current detection device Output a first output signal to a first load, when the first current value is less than the predetermined value of the first current, the first current detection control circuit outputs a second detection signal to the microcontroller a module, wherein the micro-control module provides a second output control signal to the first output switch element, so that the switch micro-leakage current detection device does not output the first output signal; The current value is greater than or equal to a predetermined second current value, the second current detection control circuit outputs a third detection signal to the micro-control module, and the micro-control module provides a third output control signal to the The second output switch element, so that the switch micro-leakage current detection device outputs a second output signal to a second load, when the second current value is less than the predetermined value of the second current, the second current The detection control circuit outputs a fourth detection signal to the micro-control module, and the micro-control module provides a fourth output control signal to the second output switch element, so that the micro-leakage current of the switch is detected The device does not output the second output signal.

One of the beneficial effects of the present invention is that the switch micro-current detection device of the present invention can use a simple and convenient circuit to effectively avoid the switch malfunction caused by the small leakage current in the connected switch elements, and effectively improve the device of the switch element. reliability. In addition, the invented switch micro-current detection device can also connect a plurality of switch elements at the same time, so as to effectively reduce the installation cost.

For a further understanding of the features and technical content of the present invention, please refer to the following detailed descriptions and drawings of the present invention. However, the drawings provided are only for reference and description, and are not intended to limit the present invention.

The following are specific embodiments to illustrate the implementation of the "switch micro-leakage current detection device" disclosed in the present invention, and those skilled in the art can understand the advantages and effects of the present invention from the content disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of the present invention. In addition, the drawings of the present invention are merely schematic illustrations, and are not drawn according to the actual size, and are stated in advance. The following embodiments will further describe the related technical contents of the present invention in detail, but the disclosed contents are not intended to limit the protection scope of the present invention. In addition, the term "or", as used herein, should include any one or a combination of more of the associated listed items, as the case may be.

[First Embodiment]

Please refer to FIG. 1 , FIG. 2 and FIG. 3 . FIG. 1 is a schematic diagram of a switch micro-leakage current detection device according to a first embodiment of the present invention. FIG. 2 is a functional block diagram of the current detection control circuit according to the first embodiment of the present invention. FIG. 3 is a functional block diagram of the current detection control unit according to the first embodiment of the present invention.

In this embodiment, if the electronic component with two pins is arranged horizontally, the left side is the first end, and the right side is the second end. If the electronic components are arranged vertically, the upper part is the first end and the lower part is the second end. For electronic components with more than three pins, the order of the pins indicated on the diagram is used as the basis for description.

In addition, the switching element in this embodiment may be an electronic switching element or a mechanical switching element. If the switching element in this embodiment is an electronic switching element, it may include a bipolar transistor (BJT), a metal oxide semiconductor (MOSFET) or an insulated gate bipolar transistor (IGBT).

Please refer to FIG. 1 , the switch micro-leakage current detection device 1 in FIG. 1 includes a first connection part CON1 , a second connection part CON2 , a ground terminal GND and a signal output terminal VOUT. The first connection portion CON1 and the second connection portion CON2 are respectively electrically connected to two ends of a switch element SW. The signal output terminal VOUT is connected to a load LOAD. In this embodiment, the load LOAD is a lamp, a voltage conversion coil, a relay or an ignition device.

The switch micro-leakage current detection device 1 includes a current detection control circuit 11 and a current detection circuit 12 . The current detection control circuit 11 is electrically connected to the first connection portion CON1.

The current detection circuit 12 is electrically connected to the second connection portion CON2 and the current detection control circuit 11 . The current detection circuit 12 is used for detecting a current value passing through the switching element SW.

When the current value is greater than or equal to a predetermined current value, the current detection control circuit 11 outputs a first control signal to the current detection circuit 12 , so that the switch micro-leakage current detection device 1 outputs an output signal to a load LOAD. When the current value is less than the predetermined current value, the current detection control circuit 11 outputs a second control signal to the current detection circuit 12 so that the switch micro-leakage current detection device 1 does not output an output signal.

Please refer to FIG. 2 , the current detection circuit 12 includes a first switch S1 , a second switch S2 , a first impedance R1 and a second impedance R2 . The first switch S1 is connected in parallel with the first impedance R1. The first switch S1 and a first end of the first impedance R1 are connected to the second connection portion CON2. The first switch S1 and a second end of the first impedance R1 are connected to a first end of the second impedance R2. A second end of the second impedance R2 is connected to a first end of the second switch S2. A second end of the second switch S2 is connected to a ground potential. A third terminal of the first switch S1 and a third terminal of the second switch are connected to the current detection control circuit 11 . The first end and the second end of the second impedance R2 are electrically connected to the current detection control circuit 11 . In this embodiment, the second end of the second impedance R2 is also connected to the signal output end VOUT.

The switch micro-leakage current detection device 1 further includes a power input terminal VIN. The power input terminal VIN is electrically connected to an input power source Vsource. The input power source Vsource is electrically connected to the current detection control circuit 11 and the first connection portion CON1.

According to the above circuit configuration, when the switch element SW is turned on (pressed, switched to the conduction mode, or there is water vapor inside the switch element and a leakage current occurs), a current flows through the switch element SW. However, when the switching element SW is in the open (OFF) state, the first switch S1 is in the open (OFF) state, and the second switch S2 is in the conductive (ON) state. That is, even if there is a leakage current passing through the switching element SW at this time, the switching micro-leakage current detecting device 1 will not output an output signal to the load LOAD through the signal output terminal VOUT. When the switch element SW is not turned on, the first control signal provided by the current detection control circuit 11 to the first switch S1 and the second switch S2 of the current detection circuit 12 is an OFF signal and an ON signal respectively ( ON signal).

At this time, the leakage current passing through the switching element SW will flow through the first impedance R1 and the second impedance R2, and then flow through the second switch S2 to the ground potential. The current detection control circuit 11 can judge the magnitude of the current flowing through the switch element SW through the voltage difference between the two ends of the second impedance R2. That is, when the switching element SW is turned on, the current value flowing through the switching element SW is greater than a predetermined current value.

The second control signals provided by the current detection control circuit 11 to the first switch S1 and the second switch S2 of the current detection circuit 12 are an ON signal and an OFF signal, respectively. At this time, when the first switch S1 is in an on state and the second switch is in an off state, the signal output terminal VOUT of the switch micro-leakage current detection device 1 will output an output signal.

Please refer to FIG. 3 , the current detection control circuit 11 includes a current detection control unit 111 and a control switch element 112 . The current detection control unit 111 is electrically connected to the control switch element 112 . The control switch element 112 is electrically connected to the first switch S1 and the second switch S2 to control the opening and closing of the first switch S1 and the second switch S2. The current detection control unit 111 is electrically connected to the first end of the second impedance R2 and the second end of the second impedance R2. In this embodiment, the control signals provided by the control switch element 112 to the first switch S1 and the second switch S2 are inverted signals.

The current detection control unit 111 includes a microcontroller 111A, a comparator 111B and a current detection low dropout regulator 111C. The current detection low dropout regulator 111C is electrically connected to the microcontroller 111A and the comparator 11B to provide power. In this embodiment, the current detection low dropout regulator 111C is a low dropout regulator (Low Dropout Regulator) with a voltage of 12V to 5V. In other embodiments, the current sensing low dropout regulator 111C may be a low dropout regulator that is scaled by other input voltages. The microcontroller 111A is a current detection control chip, a central processing unit (CPU), a microcontroller (MCU), and an application-specific integrated circuit chip (ASIC).

The microcontroller 111A is electrically connected to an input terminal of the comparator 111B, and the other input terminal of the comparator 111B is connected to a reference voltage Vref. In this embodiment, the reference voltage Vref is obtained by passing the voltage of the power input terminal VIN through a voltage divider circuit. An output terminal of the comparator 111B is electrically connected to the control switching element 112 to control the switching element 112 to be turned on and off. The microcontroller 111A detects the voltage difference across the second impedance R2 to output a voltage value to the comparator 111B. The comparator 111 compares the voltage value provided by the microcontroller 111A with the reference voltage Vref, and then outputs a control signal to the control switch element 112 .

The switch micro-current detection device 1 of the present embodiment can effectively avoid the switch malfunction caused by a small leakage current, and the circuit is not only simple but also convenient to set up.

[Second Embodiment]

Please refer to FIG. 4 , FIG. 5 and FIG. 6 . FIG. 4 is a schematic diagram of a switch micro-leakage current detection device according to a second embodiment of the present invention. FIG. 5 is a functional block diagram of a current detection control circuit according to a second embodiment of the present invention. FIG. 6 is a functional block diagram of a current detection control unit according to a second embodiment of the present invention.

Referring to FIG. 4 , the switch micro-leakage current detection device 2 includes a first connection part CON1 , a second connection part CON2 , a power input terminal VIN, a ground terminal GND and a signal output terminal VOUT. The first connection portion CON1 and the second connection portion CON2 are respectively electrically connected to both ends of the switching element SW. The signal output terminal VOUT is connected to a load LOAD. In this embodiment, the load LOAD is a lamp, a voltage conversion coil, a relay or an ignition device.

The switch micro-leakage current detection device 2 includes a current detection control circuit 21 , a current detection circuit 22 and an output switch element 23 . The current detection control circuit 21 is electrically connected to the first connection portion CON1. The current detection circuit 22 is electrically connected to the second connection portion CON2 and the current detection control circuit 21 . The current detection circuit 22 detects a current value passing through the switching element SW. A first terminal and a second terminal of the output switch element 23 are electrically connected to the power input terminal VIN and the signal output terminal VOUT, respectively.

Wherein, when the current value is greater than or equal to a predetermined current value, the current detection control circuit 21 outputs a first control signal to an output switch element 23, so that the switch micro-leakage current detection device 2 outputs an output signal to a load LOAD . The first control signal is an ON signal.

When the current value is less than the predetermined current value, the current detection control circuit 21 outputs a second control signal to the output switch element, so that the switch micro-leakage current detection device 2 does not output the output signal. The second control signal is an OFF signal.

Referring to FIG. 5, the current detection circuit 21 includes a first impedance R1 and a second impedance R2. The first impedance R1 is connected in series with the second impedance R2. A first end of the first impedance R1 is electrically connected to the second connection portion CON2. A second end of the first impedance R1 is electrically connected to a first end of the second impedance R2. A first end and a second end of the second impedance R2 are electrically connected to the current detection control circuit 21 . The second end of the second impedance R2 is electrically connected to a ground potential.

The current detection control circuit 21 includes a current detection control unit 211 and a control switch element 212 . The current detection control unit 211 is electrically connected to the control switch element 212 . The control switch element 212 is electrically connected to the output switch element 23 to control the opening and closing of the output switch element 23 . The current detection control unit 211 is electrically connected to the first end of the second impedance R2 and the second end of the second impedance R2.

Referring to FIG. 6 , the current detection control unit 211 includes a microcontroller 211A, a comparator 211B, and a current detection low-dropout regulator 211C. The current detection low dropout regulator 211C is electrically connected to the microcontroller 211A and the comparator 211B to provide power. In this embodiment, the current detection low dropout regulator 211C is a low dropout regulator (Low Dropout Regulator) with a voltage of 12V to a voltage of 5V. The microcontroller 211A is a current detection control chip, a central processing unit (CPU), a microcontroller (MCU), and an application-specific integrated circuit chip (ASIC).

The microcontroller 211A is electrically connected to an input terminal of the comparator 211B, and the other input terminal of the comparator 211B is connected to a reference voltage Vref. In this embodiment, the reference voltage Vref is obtained by passing the voltage of the power input terminal VIN through a voltage divider circuit. An output terminal of the comparator 211B is electrically connected to the control switch element 212 to control the switch element 212 to be turned on and off. The microcontroller 211A detects the voltage difference across the second impedance R2 to output a voltage value to the comparator 211B. The comparator 211 compares the voltage value provided by the microcontroller 211A with the reference voltage Vref, and then outputs a control signal to the control switch element 212 .

The switch micro-current detection device 2 of the present embodiment can effectively avoid the switch malfunction caused by a small leakage current, and the circuit is not only simple but also convenient to set up.

[Third Embodiment]

Please refer to FIG. 7 , FIG. 8A , FIG. 8B , FIG. 9A and FIG. 9B . FIG. 7 is a schematic diagram of a switch micro-leakage current detection device according to a third embodiment of the present invention. 8A is a functional block diagram of a first current detection control circuit according to a third embodiment of the present invention. 8B is a functional block diagram of the second current detection control circuit according to the third embodiment of the present invention. 9A is a functional block diagram of a first current detection control unit according to a third embodiment of the present invention. 9B is a functional block diagram of the second current detection control unit according to the third embodiment of the present invention.

Referring to FIG. 7 , in this embodiment, the switch micro-leakage current detection device 3 can be connected to a plurality of switching elements to avoid malfunction caused by the leakage current of each switching element.

The switch micro-leakage current detection device 3 includes a first connection part CON1, a second connection part CON2, a third connection part CON3, a fourth connection part CON4, a power input terminal VIN, a ground terminal GND, a first A signal output terminal VOUT1 and a second signal output terminal VOUT2. The first connection portion CON1 and the second connection portion CON2 are respectively electrically connected to two ends of a first switch element SW1. The third connection portion CON3 and the fourth connection portion CON4 are respectively electrically connected to both ends of a second switch element SW2. The switch micro-leakage current detection device 3 includes a first current detection control circuit 31 , a first current detection circuit 32 , a first output switch element 33 , a second current detection control circuit 34 , and a second current The detection circuit 35 and a second output switch element 36 are provided. The first signal output terminal VOUT1 is connected to a first load LOAD1. The second signal output terminal VOUT2 is connected to a second load LOAD2. In this embodiment, the first load LOAD1 and the second load LOAD2 may be a lamp, a voltage conversion coil, a relay or an ignition device, respectively.

The first current detection control circuit 31 is electrically connected to the first connection portion CON1. The first current detection circuit 32 is electrically connected to the second connection portion CON2 and the first current detection control circuit 31 . The first current detection circuit 32 detects a first current value passing through the first switch element SW1. A first terminal and a second terminal of the first output switch element 33 are electrically connected to the power input terminal VIN and the first signal output terminal VOUT1, respectively.

The second current detection control circuit 34 is electrically connected to the third connection portion CON3. The second current detection circuit 35 is electrically connected to the fourth connection portion CON4 and the second current detection control circuit 34 . The second current detection circuit 35 detects a second current value passing through the second switch element SW2.

A first terminal and a second terminal of the second output switch element 36 are electrically connected to the power input terminal VIN and the second signal output terminal VOUT2, respectively.

When the first current value is greater than or equal to a predetermined first current value, the first current detection control circuit 31 outputs a first control signal to the first output switch element 33 so that the switch micro-leakage current detection device 3 outputs A first output signal is sent to a first load LOAD1. The first control signal is an ON signal.

When the first current value is smaller than the predetermined first current value, the first current detection control circuit 31 outputs a second control signal to the first output switch element 33, so that the switch micro-leakage current detection device 3 does not output the first output signal. The second control signal is an OFF signal.

Wherein, when the second current value is greater than or equal to a predetermined second current value, the second current detection control circuit 34 outputs a third control signal to the second output switch element 36, so that the switch micro-leakage current detection device 3 outputs A second output signal is sent to a second load LOAD2. The third control signal is an ON signal.

When the second current value is less than the predetermined second current value, the second current detection control circuit 34 outputs a fourth control signal to the second output switch element 36, so that the switch micro-leakage current detection device 3 does not output the second output signal. The fourth control signal is an OFF signal.

8A and 8B, the first current detection circuit 32 includes a first impedance R1 and a second impedance R2, and the first impedance R1 and the second impedance R2 of the first current detection circuit 32 are connected in series. A first end of the first impedance R1 of the first current detection circuit 32 is electrically connected to the second connection portion CON2. A second end of the first impedance R1 of the first current detection circuit 32 is electrically connected to a first end of the second impedance R2 of the first current detection circuit 32 . A first end and a second end of the second impedance R2 of the first current detection circuit 32 are electrically connected to the first current detection control circuit 31 . The second end of the second impedance R2 of the first current detection circuit 32 is electrically connected to a ground potential.

In this embodiment, the structure of the second current detection control circuit 34 is the same as that of the first current detection control circuit 31 . The structure of the second current detection circuit 35 is the same as that of the first current detection circuit 32 .

The second current detection circuit 35 also includes a first impedance R1 and a second impedance R2. The first impedance R1 of the second current detection circuit 35 is connected in series with the second impedance R2 of the second current detection circuit 35 . A first end of the first impedance R1 of the second current detection circuit 35 is electrically connected to the fourth connection portion CON4. A second end of the first impedance R1 of the second current detection circuit 35 is electrically connected to a first end of the second impedance R2 of the second current detection circuit 35 . The first end and the second end of the second impedance R2 of the second current detection circuit 35 are electrically connected to the second current detection control circuit 34 . The second end of the second impedance R2 of the second current detection circuit 35 is electrically connected to a ground potential.

The first current detection control circuit 31 includes a first current detection control unit 311 and a first control switch element 312 . The first current detection control unit 311 is electrically connected to the first control switch element 312 . The first control switch element 312 is electrically connected to the first output switch element 33 to control the opening and closing of the first output switch element 33 . The first current detection control unit 311 is electrically connected to the first end of the second impedance R2 of the first current detection circuit 32 and the second end of the second impedance R2 of the first current detection circuit 32 .

The second current detection control circuit 34 further includes a second current detection control unit 341 and a second control switch element 342 . The second current detection control unit 341 is electrically connected to the second control switch element 342 . The second control switch element 342 is electrically connected to the second output switch element 36 to control the opening and closing of the second output switch element 36 . The second current detection control unit 342 is electrically connected to the first end of the second impedance R2 of the second current detection circuit 35 and the second end of the second impedance R2 of the second current detection circuit 35 .

Please refer to FIG. 9A and FIG. 9B , wherein the first current detection control unit 311 includes a microcontroller 311A, a comparator 311B, and a current detection low-dropout regulator 311C. The current detection low-dropout regulator 311C of the first current detection control unit 311 is electrically connected to the microcontroller 311A of the first current detection control unit 311 and the comparator 311B of the first current detection control unit 311 to provide power . The microcontroller 311A of the first current detection control unit 311 is electrically connected to an input terminal of the comparator 311B of the first current detection control unit 311 . The other input terminal of the comparator 311B is connected to a first reference voltage Vref1. In this embodiment, the first reference voltage Vref1 is obtained by passing the voltage of the power input terminal VIN through a voltage divider circuit. An output terminal of the comparator 311B of the first current detection control unit 311 is electrically connected to the first control switch element 312 of the first current detection control circuit 31 to control the opening and closing of the first output switch element 33 . The microcontroller 311A detects the voltage difference across the second impedance R2 of the first current detection circuit 32 to output a voltage value to the comparator 311B. The comparator 311 compares the voltage value provided by the microcontroller 311A with the first reference voltage Vref1 , and then outputs a control signal to the first control switch element 312 .

The second current detection control unit 341 includes a microcontroller 341A, a comparator 341B and a current detection low dropout regulator 341C. The current detection low-dropout regulator 341C of the second current detection control unit 341 is electrically connected to the microcontroller 341A of the second current detection control unit 341 and the comparator 341B of the second current detection control unit 341 to provide power . The microcontroller 341A of the second current detection control unit 341 is electrically connected to an input terminal of the comparator 341B of the second current detection control unit 341 . The other input terminal of the comparator 341B of the second current detection control unit 341 is connected to a second reference voltage Vref2. In this embodiment, the second reference voltage Vref2 is obtained by passing the voltage of the power input terminal VIN through a voltage divider circuit. An output terminal of the comparator 341B of the second current detection control unit 341 is electrically connected to the second control switch element 342 of the second current detection control circuit 34 to control the opening and closing of the second output switch element 36 . The microcontroller 341A of the second current detection control circuit 34 detects the voltage difference across the second impedance R2 of the second current detection circuit 35 to output a voltage value to the second current detection control circuit 34 for comparison device 341B. The comparator 341B of the second current detection control circuit 34 compares the voltage value provided by the microcontroller 341A with the second reference voltage Vref2 , and then outputs a control signal to the second control switch element 342 .

In this embodiment, the number of the current detection control circuit and the current detection circuit is two respectively. In other embodiments, the number of the connection parts connected to the switching elements can be increased, and then the number of the current detection control circuit and the current detection circuit can be correspondingly increased, so that the number of the connected switching elements can be effectively increased.

The switch micro-current detection device 3 of the present embodiment can effectively avoid the switch malfunction caused by the small leakage current in the switch element, and the circuit is not only simple but also convenient to set up. In addition, a plurality of switching elements can be connected at the same time, and the installation cost can be effectively reduced.

[Fourth Embodiment]

Please refer to FIG. 10 , FIG. 11 and FIG. 12 . FIG. 10 is a schematic diagram of a switch micro-leakage current detection device according to a fourth embodiment of the present invention. FIG. 11 is a functional block diagram of a micro-control module according to a fourth embodiment of the present invention. 12 is a functional block diagram of the first current detection control module and the second current detection control module according to the fourth embodiment of the present invention.

Referring to FIG. 10 , in this embodiment, the switch micro-leakage current detection device 4 can also be connected to a plurality of switching elements to avoid malfunction caused by the leakage current of each switching element.

The switch micro-leakage current detection device 4 includes a first connection part CON1, a second connection part CON2, a third connection part CON3, a fourth connection part CON4, a power input terminal VIN, a ground terminal GND, a first A signal output terminal VOUT1 and a second signal output terminal VOUT2. The first connection portion CON1 and the second connection portion CON2 are respectively electrically connected to two ends of a first switch element SW1. The third connection portion CON3 and the fourth connection portion CON4 are respectively electrically connected to both ends of a second switch element SW2. The first signal output terminal VOUT1 is connected to a first load LOAD1. The second signal output terminal VOUT2 is connected to a second load LOAD2. In this embodiment, the first load LOAD1 and the second load LOAD2 may be a lamp, a voltage conversion coil, a relay or an ignition device, respectively.

The switch micro-leakage current detection device 4 includes: a first current detection control circuit 41, a first current detection circuit 42, a first output switch element 43, a second current detection control circuit 44, a second current detection control circuit 44 The current detection circuit 45 , a second output switch element 46 and a micro-control module 47 are provided.

The first current detection control circuit 41 is electrically connected to the first connection portion CON1. The first current detection circuit 42 is electrically connected to the second connection portion CON2 and the first current detection control circuit 41 . The first current detection circuit 42 detects a first current value passing through the first switch element SW1. A first terminal and a second terminal of the first output switch element 43 are electrically connected to the power input terminal VIN and the first signal output terminal VOUT1, respectively.

The second current detection control circuit 44 is electrically connected to the third connection portion CON3. The second current detection circuit 45 is electrically connected to the fourth connection portion CON4 and the second current detection control circuit 44 . The second current detection circuit 45 detects a second current value passing through the second switching element SW2. A first terminal and a second terminal of the second output switch element 46 are electrically connected to the power input terminal VIN and the second signal output terminal VOUT2, respectively.

The micro-control module 47 is electrically connected to the first current detection control circuit 41 and the second current detection control circuit 44 . The micro-control module 47 is electrically connected to a third terminal of the first output switch element 43 and a third terminal of the second output switch element 46 to control the opening and closing of the first output switch element 43 and the second output switch element 46 . closure.

Wherein, when the first current value is greater than or equal to a predetermined first current value, the first current detection control circuit 41 outputs a first detection signal to the micro-control module 47 . The micro-control module 47 provides a first output control signal to the first output switch element 43, so that the switch micro-leakage current detection device 4 outputs a first output signal to a first load LOAD1.

When the first current value is less than the predetermined value of the first current, the first current detection control circuit outputs a second detection signal to the micro-control module 47, and the micro-control module 47 provides a second output control signal to the first output The switch element 43 is used so that the switch micro-leakage current detection device 4 does not output the first output signal.

Wherein, when the second current value is greater than or equal to a predetermined second current value, the second current detection control circuit 44 outputs a third detection signal to the micro-control module 47, and the micro-control module 47 provides a third output control The signal is sent to the second output switch element 46, so that the switch micro-leakage current detection device 4 outputs a second output signal to a second load LOAD2.

When the second current value is smaller than the predetermined second current value, the second current detection control circuit 44 outputs a fourth detection signal to the micro-control module 47, and the micro-control module 47 provides a fourth output control signal to the second The switching element 46 is output, so that the switching micro-leakage current detecting device 4 does not output the second output signal.

Referring to FIG. 11 , the micro-control module 47 includes a micro-control unit 471 , a micro-control low-dropout regulator 472 , a first current-controlled switching element 473 and a second current-controlled switching element 474 . The micro-control unit 471 is electrically connected to the micro-controlled low-dropout voltage regulator 472 , the first current-controlled switching element 473 and the second current-controlled switching element 474 . The micro-control unit 471 is electrically connected to the first current detection control circuit 41 and the second current detection control circuit 44 .

In this embodiment, the micro-controlled low dropout regulator 472 is a low dropout regulator (Low Dropout Regulator) with a voltage of 12V to a voltage of 5V. In other embodiments, the micro-controlled current sensing low dropout regulator 472 may be a low dropout regulator with a voltage conversion ratio. The microcontroller unit 471 is a current detection control chip, a central processing unit (CPU), a microcontroller (MCU), and an application-specific integrated circuit chip (ASIC).

The first current control switch element 473 is electrically connected to the first output switch element 43 to control the opening and closing of the first output switch element 43 . The second current control switch element 474 is electrically connected to the second output switch element 46 to control the opening and closing of the second output switch element 46 .

The first current detection circuit 42 includes a first impedance R1 and a second impedance R2. The first impedance R1 and the second impedance R2 of the first current detection circuit 42 are connected in series. A first end of the first impedance R1 of the first current detection circuit 42 is electrically connected to the second connection portion CON2. A second end of the first impedance R1 of the first current detection circuit 42 is electrically connected to a first end of the second impedance R2 of the first current detection circuit 42 . The first terminal and the second terminal of the second impedance R2 of the first current detection circuit 42 are electrically connected to the first current detection control circuit 41 . The second end of the second impedance R2 of the first current detection circuit 42 is electrically connected to a ground potential.

The second current detection circuit 45 includes a first impedance R1 and a second impedance R2. The first impedance R1 and the second impedance R2 of the second current detection circuit 45 are connected in series. A first end of the first impedance R1 of the second current detection circuit 45 is electrically connected to the fourth connection portion CON4. A second end of the first impedance R1 of the second current detection circuit 45 is electrically connected to a first end of the second impedance R2 of the second current detection circuit 45 . The first end and the second end of the second impedance R2 of the second current detection circuit 45 are electrically connected to the second current detection control circuit 44 . The second end of the second impedance R2 of the second current detection circuit 45 is electrically connected to a ground potential.

Referring to FIG. 12 , in this embodiment, the first current detection control circuit 41 includes a first current detection control unit 411 and a first low dropout regulator 412 . The first low dropout regulator 412 is electrically connected to the first current detection control unit 411 and the voltage input terminal VIN. The first current detection control unit 411 is electrically connected to the first end and the second end of the second impedance R1 of the corresponding first current detection circuit.

The second current detection control circuit 44 includes a second current detection control unit 441 and a second low dropout voltage regulator 442 . The second low dropout regulator 442 is electrically connected to the second current detection control unit 441 and the voltage input terminal VIN. The second current detection control unit 441 is electrically connected to the first end and the second end of the second impedance R1 of the corresponding second current detection circuit.

In this embodiment, the first low dropout regulator 412 and the second low dropout regulator 442 may be a low dropout regulator (Low Dropout Regulator) with a voltage of 12V to a voltage of 5V, respectively. In other embodiments, the first low-dropout regulator 412 and the second low-dropout regulator 442 may be low-dropout regulators with other voltage conversion ratios.

In this embodiment, the number of the current detection control circuit and the current detection circuit is two respectively. In other embodiments, the number of the connection parts connected to the switching elements can be increased, and then the number of the current detection control circuit and the current detection circuit can be correspondingly increased, so that the number of the connected switching elements can be effectively increased.

The switch micro-current detection device 4 of the present embodiment can effectively avoid the switch malfunction caused by the small leakage current in the switch element, and the circuit is not only simple but also convenient to set up. In addition, a plurality of switching elements can be connected at the same time, and the installation cost can be effectively reduced.

[Advantageous effects of the embodiment]

One of the beneficial effects of the present invention is that the switch micro-current detection device of the present invention can use a simple and convenient circuit to effectively avoid the switch malfunction caused by the small leakage current in the connected switch elements, and effectively improve the device of the switch element. reliability. In addition, the invented switch micro-current detection device can also connect a plurality of switch elements at the same time, so as to effectively reduce the installation cost.

The contents disclosed above are only preferred feasible embodiments of the present invention, and are not intended to limit the scope of the present invention. Therefore, any equivalent technical changes made by using the contents of the description and drawings of the present invention are included in the application of the present invention. within the scope of the patent.

1, 2, 3, 4: Switch micro-leakage current detection device 11,21: Current detection control circuit 12,22: Current detection circuit CON1: The first connection part CON2: Second connection part CON3: The third connection CON4: Fourth connection VIN: Voltage input terminal VOUT: Signal output terminal VOUT1: The first signal output terminal VOUT2: The second signal output terminal GND: ground terminal S1: The first switch S2: Second switch SW: switch element SW1: The first switching element SW2: Second switching element R1: first impedance R2: Second Impedance Vsource: input power 111,211: Current detection control unit 112, 212: Control switching elements 111A, 211A, 311A, 341A: Microcontrollers 111B, 211B, 311B, 341B: Comparator 111C, 211C, 311C, 341C: Current Sensing Low Dropout Regulators Verf: reference voltage Vref1: The first reference voltage Vref2: The second reference voltage LOAD: load LOAD1: The first load LOAD2: The second load 23: Output switching element 31,41: The first current detection control circuit 32,42: The first current detection circuit 33, 43: First output switching element 34,44: The second current detection control circuit 35,45: The second current detection circuit 36, 46: Second output switching element 47: Micro control module 311, 411: The first current detection control unit 312: first control switching element 341: The second current detection control unit 342: Second control switching element 471: Micro Control Unit 472: Micro Control Low Dropout Regulator 473: first current control switching element 474: Second current control switching element 412: First Low Dropout Regulator 441: The second current detection control unit 442: Second Low Dropout Regulator

FIG. 1 is a schematic diagram of a switch micro-leakage current detection device according to a first embodiment of the present invention.

FIG. 2 is a functional block diagram of the current detection control circuit according to the first embodiment of the present invention.

FIG. 3 is a functional block diagram of the current detection control unit according to the first embodiment of the present invention.

4 is a schematic diagram of a switch micro-leakage current detection device according to a second embodiment of the present invention.

FIG. 5 is a functional block diagram of a current detection control circuit according to a second embodiment of the present invention.

FIG. 6 is a functional block diagram of a current detection control unit according to a second embodiment of the present invention.

7 is a schematic diagram of a switch micro-leakage current detection device according to a third embodiment of the present invention.

8A is a functional block diagram of a first current detection control circuit according to a third embodiment of the present invention.

8B is a functional block diagram of the second current detection control circuit according to the third embodiment of the present invention.

9A is a functional block diagram of a first current detection control unit according to a third embodiment of the present invention.

9B is a functional block diagram of the second current detection control unit according to the third embodiment of the present invention.

10 is a schematic diagram of a switch micro-leakage current detection device according to a fourth embodiment of the present invention.

FIG. 11 is a functional block diagram of a micro-control module according to a fourth embodiment of the present invention.

12 is a functional block diagram of the first current detection control module and the second current detection control module according to the fourth embodiment of the present invention.

1: Switch micro-leakage current detection device

11: Current detection control circuit

12: Current detection circuit

R1: first impedance

R2: Second Impedance

S1: The first switch

S2: Second switch

CON1: The first connection part

CON2: Second connection part

SW: switch element

VIN: Voltage input terminal

VOUT: Signal output terminal

GND: ground terminal

Vsource: input power

Claims (14)

A switch micro-leakage current detection device, comprising at least a first connection part, a second connection part and a signal output terminal, the first connection part and the second connection part are respectively electrically connected to two parts of a switch element. terminal, the signal output terminal is electrically connected to a load, and the switch micro-leakage current detection device includes: a current detection control circuit electrically connected to the first connection part; and a current detection circuit electrically connected to the second connection part and the current detection control circuit, the current detection circuit detects a current value passing through the switching element, when the current value is greater than or equal to a current predetermined value, the current detection control circuit outputs a first control signal to the current detection circuit, so that the switch micro-leakage current detection device outputs an output signal to the load, when the current If the value is smaller than the predetermined current value, the current detection control circuit outputs a second control signal to the current detection circuit, so that the switch micro-leakage current detection device does not output the output signal. The switch micro-leakage current detection device according to claim 1, wherein the current detection circuit comprises a first switch, a second switch, a first impedance and a second impedance, the first switch and The first impedances are connected in parallel, the first switch and a first end of the first impedance are connected to the second connection part, and the first switch and a second end of the first impedance are connected to the second connection part. A first end of the second impedance, a second end of the second impedance is connected to a first end of the second switch, a second end of the second switch is connected to a ground potential, the first end A third end of a switch and a third end of the second switch are connected to the current detection control circuit, and the first end and the second end of the second impedance are electrically connected to the current Detection control circuit. The switch micro-leakage current detection device according to claim 2, further comprising a power input terminal electrically connected to an input power supply, and the input power supply is electrically connected to the current detection control circuit and the first connection portion . The switch micro-leakage current detection device according to claim 3, wherein the current detection control circuit further comprises a current detection control unit and a control switch element, the current detection control unit is electrically connected to the a control switch element, the control switch element is electrically connected to the first switch and the second switch to control the opening and closing of the first switch and the second switch, the current detection control unit is electrically The first end of the second impedance and the second end of the second impedance are connected. The switch micro-leakage current detection device according to claim 4, wherein the current detection control unit comprises a microcontroller, a comparator and a current detection low dropout regulator, the current detection low voltage The step-down regulator is electrically connected to the microcontroller and the comparator to provide power, the microcontroller is electrically connected to an input end of the comparator, and an output end of the comparator is electrically connected to the The control switch element is used to control the opening and closing of the switch element. A switch micro-leakage current detection device at least comprises a first connection part, a second connection part, a power input end and a signal output end, the first connection part and the second connection part are respectively electrically connected to a Both ends of the switch element, the signal output terminal is electrically connected to a load, and the switch micro-leakage current detection device includes: a current detection control circuit electrically connected to the first connection part; a current detection circuit electrically connected to the second connection portion and the current detection control circuit, the current detection circuit detecting a current value passing through the switching element; and an output switch element, a first end and a second end of the output switch element are respectively electrically connected to the power input end and the signal output end; Wherein, when the current value is greater than or equal to a predetermined current value, the current detection control circuit outputs a first control signal to an output switch element, so that the switch micro-leakage current detection device outputs an output signal to For the load, when the current value is less than the predetermined current value, the current detection control circuit outputs a second control signal to the output switch element, so that the switch micro-leakage current detection device does not output the output signal. The switch micro-leakage current detection device according to claim 6, wherein the current detection circuit comprises a first impedance and a second impedance, the first impedance and the second impedance are connected in series, and the A first end of the first impedance is electrically connected to the second connection part, a second end of the first impedance is electrically connected to a first end of the second impedance, and the second end of the second impedance is The first end and a second end are electrically connected to the current detection control circuit, and the second end of the second impedance is electrically connected to a ground potential. The switch micro-leakage current detection device according to claim 7, wherein the current detection control circuit further comprises a current detection control unit and a control switch element, the current detection control unit is electrically connected to the a control switch element, the control switch element is electrically connected to the output switch element to control the opening and closing of the output switch element, the current detection control unit is electrically connected to the first one of the second impedance terminal and the second terminal of the second impedance. The switch micro-leakage current detection device according to claim 8, wherein the current detection control unit comprises a microcontroller, a comparator, and a current detection low-dropout regulator, the current detection low-voltage The step-down regulator is electrically connected to the microcontroller and the comparator to provide power, the microcontroller is electrically connected to an input end of the comparator, and an output end of the comparator is electrically connected to the The control switch element is used to control the opening and closing of the output switch element. A switch micro-leakage current detection device, comprising at least a first connection part, a second connection part, a third connection part, a fourth connection part, a power input end, a first signal output end and a second a signal output end, the first connection part and the second connection part are respectively electrically connected to two ends of a first switch element, the third connection part and the fourth connection part are respectively electrically connected to a second Both ends of the switch element, the first signal output terminal is electrically connected to a first load, the second signal output terminal is electrically connected to a second load, and the switch micro-leakage current detection device includes: a first current detection control circuit electrically connected to the first connection part; a first current detection circuit electrically connected to the second connection part and the first current detection control circuit, the first current detection circuit detects a first current passing through the first switch element value; a first output switch element, a first terminal and a second terminal of the first output switch element are electrically connected to the power input terminal and the first signal output terminal, respectively; a second current detection control circuit electrically connected to the third connection part; a second current detection circuit electrically connected to the fourth connection part and the second current detection control circuit, the second current detection circuit detects a second current passing through the second switch element value; a second output switch element, a first end and a second end of the first output switch element are electrically connected to the power input end and the second signal output end, respectively; Wherein, when the first current value is greater than or equal to a predetermined first current value, the first current detection control circuit outputs a first control signal to the first output switch element, so that the switch leaks slightly The current detection device outputs a first output signal to the first load, and when the first current value is less than the predetermined value of the first current, the first current detection control circuit outputs a second control signal to the first load. the first output switch element, so that the switch micro-leakage current detection device does not output the first output signal; Wherein, when the second current value is greater than or equal to a predetermined second current value, the second current detection control circuit outputs a third control signal to the second output switch element, so that the switch leaks slightly The current detection device outputs a second output signal to the second load, and when the second current value is less than the predetermined value of the second current, the second current detection control circuit outputs a fourth control signal to the second load. the second output switch element, so that the switch micro-leakage current detection device does not output the second output signal. The switch micro-leakage current detection device according to claim 10, wherein the first current detection circuit comprises a first impedance and a second impedance, and the first impedance of the first current detection circuit connected in series with the second impedance, a first end of the first impedance of the first current detection circuit is electrically connected to the second connection part, and the first end of the first current detection circuit A second end of an impedance is electrically connected to a first end of the second impedance of the first current detection circuit, and the first end of the second impedance of the first current detection circuit and a second terminal is electrically connected to the first current detection control circuit, and the second terminal of the second impedance of the first current detection circuit is electrically connected to a ground potential; The second current detection circuit includes a first impedance and a second impedance, the first impedance of the second current detection circuit is connected in series with the second impedance of the second current detection circuit , a first end of the first impedance of the second current detection circuit is electrically connected to the fourth connection part, and a second end of the first impedance of the second current detection circuit is electrically connected A first end of the second impedance of the second current detection circuit is electrically connected, and the first end and a second end of the second impedance of the second current detection circuit are electrically connected the second current detection control circuit, the second end of the second impedance of the second current detection circuit is electrically connected to a ground potential; Wherein, the first current detection control circuit further includes a first current detection control unit and a first control switch element, the first current detection control unit is electrically connected to the first control switch element, so The first control switch element is electrically connected to the first output switch element to control the opening and closing of the first output switch element, and the first current detection control unit is electrically connected to the first current detection element the first end of the second impedance of the circuit and the second end of the second impedance of the first current detection circuit; Wherein, the second current detection control circuit further includes a second current detection control unit and a second control switch element, the second current detection control unit is electrically connected to the second control switch element, so The second control switch element is electrically connected to the second output switch element to control the opening and closing of the second output switch element, and the second current detection control unit is electrically connected to the second current detection element the first end of the second impedance of the circuit and the second end of the second impedance of the second current detection circuit; Wherein, the first current detection control unit includes a microcontroller, a comparator and a current detection low drop voltage regulator, and the current detection low drop voltage regulator of the first current detection control unit The device is electrically connected to the microcontroller of the first current detection control unit and the comparator of the first current detection control unit to provide power, the first current detection control unit of the The microcontroller is electrically connected to an input end of the comparator of the first current detection control unit, and an output end of the comparator of the first current detection control unit is electrically connected to the first the first control switch element of the current detection control circuit to control the opening and closing of the first output switch element; Wherein, the second current detection control unit includes a microcontroller, a comparator and a current detection low drop voltage regulator, and the current detection low drop voltage regulator of the second current detection control unit The device is electrically connected to the microcontroller of the second current detection control unit and the comparator of the second current detection control unit to provide power, the second current detection control unit of the The microcontroller is electrically connected to an input end of the comparator of the second current detection control unit, and an output end of the comparator of the second current detection control unit is electrically connected to the second The second control switch element of the current detection control circuit controls the opening and closing of the second output switch element. A switch micro-leakage current detection device, comprising at least a first connection part, a second connection part, a third connection part, a fourth connection part, a power input end, a first signal output end and a second a signal output end, the first connection part and the second connection part are respectively electrically connected to two ends of a first switch element, the third connection part and the fourth connection part are respectively electrically connected to a second Both ends of the switch element, the first signal output terminal is electrically connected to a first load, the second signal output terminal is electrically connected to a second load, and the switch micro-leakage current detection device includes: a first current detection control circuit electrically connected to the first connection part; a first current detection circuit electrically connected to the second connection part and the first current detection control circuit, the first current detection circuit detects a first current passing through the first switch element value; a first output switch element, a first terminal and a second terminal of the first output switch element are electrically connected to the power input terminal and the first signal output terminal, respectively; a second current detection control circuit electrically connected to the third connection part; a second current detection circuit electrically connected to the fourth connection part and the second current detection control circuit, the second current detection circuit detects a second current passing through the second switch element value; a second output switch element, a first terminal and a second terminal of the first output switch element are electrically connected to the power input terminal and the second signal output terminal, respectively; and A micro-control module is electrically connected to the first current detection control circuit and the second current detection control circuit, the micro-control module is electrically connected to a third end of the first output switch element and a third end of the second output switch element; Wherein, when the first current value is greater than or equal to a predetermined first current value, the first current detection control circuit outputs a first detection signal to the micro-control module, and the micro-control module provides A first output control signal is sent to the first output switch element, so that the switch micro-leakage current detection device outputs a first output signal to a first load, when the first current value is smaller than the first current predetermined value value, the first current detection control circuit outputs a second detection signal to the micro-control module, and the micro-control module provides a second output control signal to the first output switch element, so that all The switch micro-leakage current detection device does not output the first output signal; Wherein, when the second current value is greater than or equal to a predetermined second current value, the second current detection control circuit outputs a third detection signal to the micro-control module, and the micro-control module provides A third output control signal is sent to the second output switch element, so that the switch micro-leakage current detection device outputs a second output signal to a second load, when the second current value is smaller than the second current predetermined value value, the second current detection control circuit outputs a fourth detection signal to the micro-control module, and the micro-control module provides a fourth output control signal to the second output switch element, so that all The switch micro-leakage current detection device does not output the second output signal. The switch micro-leakage current detection device of claim 12, wherein the micro-control module comprises a micro-control unit, a micro-control low-dropout voltage regulator, a first current-controlled switching element and a second current-controlled switch element, the micro-control unit is electrically connected to the micro-control low-dropout regulator, the first current-controlled switching element and the second current-controlled switching element, and the micro-control unit is electrically connected to the second a current detection control circuit and the second current detection control circuit; Wherein, the first current control switch element is electrically connected to the first output switch element to control the opening and closing of the first output switch element, and the second current control switch element is electrically connected to the second output a switch element to control the opening and closing of the second output switch element. The switch micro-leakage current detection device of claim 13, wherein each of the current detection circuits includes a first impedance and a second impedance, and the first impedance of each of the current detection circuits is connected in series with the second impedance of each of the current detection circuits, a first end of the first impedance of each of the current detection circuits is electrically connected to the second connection portion, and each A second end of the first impedance of the current detection circuit is electrically connected to a first end of the second impedance of each of the current detection circuits, and the The first end and a second end of the second impedance are electrically connected to the corresponding current detection control circuit, and the second end of the second impedance of each of the current detection circuits is electrically connected to a ground potential; Wherein, each of the current detection control circuits includes a low dropout regulator and a current detection control unit, and the low dropout regulator of each of the current detection control circuits is electrically connected to each of the The current detection control unit and the voltage input end of the current detection control circuit, the current detection control unit of each current detection control circuit is electrically connected to the current detection control unit of each current detection control circuit the first end and the second end of the second impedance.

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