CN115480146A - circuit sensing device - Google Patents

Abstract

The invention provides a circuit sensing device, which is coupled with a first end part and a second end part of a circuit to be tested and generates a voltage signal to the circuit to be tested through the first end part and the second end part, and the circuit sensing device detects a detection voltage signal corresponding to the voltage signal through the first end part and the second end part and generates a detection signal, thereby obtaining an operation result and judging whether at least one voltage change of the detection voltage signal is smaller than a first threshold value according to the operation result so as to confirm whether the circuit to be tested is normal or not.

Description

circuit sensing device

technical field

The invention relates to a circuit sensing device, in particular to detect corresponding detection voltage signals through the first end and the second end of the circuit to be tested.

Background technique

Nowadays, for the insulation between the two lines of the circuit substrate (such as: printed circuit board, wafer substrate), it is necessary to judge whether the insulation between the lines by the insulation inspection device, so as to ensure sufficient insulation between the lines, and the insulation inspection device checks the circuit The substrate judges whether it is a good product through insulation detection. When detecting the insulation state between the lines on the circuit substrate, it is necessary to provide the inspection current through the detection probe, and obtain the feedback voltage value through the impedance element as the inspection voltage, and compare it with the current value flowing in the detection probe, To obtain the insulation resistance value, and check whether the insulation state on the circuit board is good or not based on the measured insulation resistance value. During the detection process, there may be cases where electric sparks are generated between the lines due to a drastic change in the detection voltage. Therefore, when the electric sparks are generated, the circuit board is judged as a defective product. Then the insulation detection of the circuit substrate is called spark detection.

In the prior art, a detection device with a plurality of probes is used to contact at least two lines on the circuit substrate for detection. Each probe is a conductive element formed in the shape of a rod or even a needle, to receive the constant current provided by the constant current source to the feedback current between the two lines, and to obtain the detection voltage between the two lines with the impedance element, that is, through The detection voltage is obtained by the principle that the voltage value is the result of multiplying the current value and the impedance value. However, because the detection device in the prior art senses current, it is easy to fail to detect the weak current, or the detection sensitivity of the probe is improved, but the cost of the detection device is increased. Alternatively, it is necessary to consider the conversion of current and impedance elements into voltage signals and replace the impedance elements of the detection device to obtain better detection results.

Based on the above problems, the present invention provides a circuit sensing device, which uses a voltage power supply circuit to provide a better voltage signal and supplies it to the circuit under test, and uses a voltage detection circuit to detect the detected voltage signal of the circuit under test , to generate a detection signal, and judge whether the circuit under test is a good product according to the voltage change of the detection signal, so as to avoid the situation of detecting a small current, and avoid considering the situation that the current is converted into a voltage signal with an impedance element.

Contents of the invention

One object of the present invention is to provide a circuit sensing device, which uses a voltage signal to supply a circuit to be tested, and detects a corresponding detection voltage signal on the circuit to be tested to generate a detection signal. Detect the voltage change of the signal to determine whether the circuit under test is a good product, so as to avoid the situation of detecting the small current, and at the same time avoid considering the situation that the current is converted into a voltage signal with the impedance element.

The invention discloses a circuit sensing device, which detects a circuit to be tested. The circuit to be tested has a first terminal and a second terminal. The circuit sensing device includes a voltage power supply circuit, a voltage detection circuit and an operation control circuit. . The voltage power supply circuit is coupled to the first terminal and the second terminal, the voltage power supply circuit generates a voltage signal and transmits it to the circuit under test through the first terminal and the second terminal, and the voltage detection circuit is also coupled connected to the first terminal and the second terminal, and coupled to the voltage power supply circuit in parallel, the voltage detection circuit detects the detection voltage signal corresponding to the voltage signal through the first terminal and the second terminal, In order to generate the detection signal correspondingly, the operation control circuit is coupled to the voltage detection circuit to receive the detection signal, and perform calculation according to the detection signal to obtain a calculation result, and the calculation result corresponds to the voltage change of the detection signal , the operation control circuit judges whether the circuit under test is a defective product according to whether the voltage change is smaller than a first threshold value. Thus, the circuit sensing device of the present invention provides the voltage signal to the circuit under test, so the voltage detection circuit does not need to consider the conversion of current and impedance elements into voltage, and directly receives the detection voltage signal and according to the detection The detection signal is generated by measuring the voltage signal, and the situation that the current signal is too small can be avoided.

The present invention provides an embodiment, in that the voltage power supply circuit includes a voltage generating circuit and a current limiting element, wherein the voltage generating circuit is used to generate the voltage signal, and the current limiting element is coupled to the voltage generating circuit and the circuit to be tested Between, and limit the maximum current value corresponding to the voltage signal.

The present invention provides an embodiment, in that the calculation control circuit performs calculation according to a plurality of voltage values corresponding to the detection signal to obtain the calculation result, the calculation result corresponds to the voltage change, when the voltage change is less than the first threshold value , the operation control circuit determines that the circuit under test is abnormal.

The present invention provides an embodiment, when the voltage changes to a negative voltage difference, the operation control circuit obtains the maximum breakover voltage according to the negative voltage difference, and the operation control circuit obtains the maximum breakover voltage according to the positive voltage difference after the negative voltage difference When it is greater than the second threshold value, the operation control circuit obtains the minimum transition voltage according to the positive voltage difference, and the operation control circuit generates correction data according to the maximum transition voltage and the minimum transition voltage.

The present invention provides an embodiment, in that the voltage detection circuit includes a voltage detection module, which is coupled to the voltage power supply circuit and the first terminal to detect the detection signal, and the voltage detection module includes a first detection module. detection circuit, a second detection circuit, a differential unit and a first analog-to-digital conversion circuit, wherein the first detection circuit is coupled to the voltage supply circuit and the first terminal, and the second detection circuit is coupled to the first Two terminals, the differential unit is coupled to the first detection circuit and the second detection circuit; and the first analog-to-digital conversion circuit is coupled to the differential unit and the operation control circuit to output the detection signal to The arithmetic control circuit.

The present invention provides an embodiment, in that the first detection circuit includes a first gain unit, a first voltage divider circuit and a second gain unit, the first gain unit is coupled to the voltage supply circuit and the first terminal, the The first voltage dividing circuit is coupled to the first gain unit, has a first voltage dividing unit and a second voltage dividing unit, and the second gain unit is coupled between the first voltage dividing unit and the second voltage dividing unit and coupled connected to the positive input of the differential unit.

The present invention provides an embodiment, in that the second detection circuit includes a third gain unit, a second voltage dividing circuit and a fourth gain unit, the third gain unit is coupled to the second terminal, and the second voltage dividing circuit is coupled to connected to the third gain unit, having a third voltage dividing unit and a fourth voltage dividing unit, the fourth gain unit is coupled between the third voltage dividing unit and the fourth voltage dividing unit, and is coupled to the difference The negative input terminal of the moving unit.

The present invention provides an embodiment, in that the voltage detection circuit further includes a voltage division detection module, which is coupled to the voltage power supply circuit and the second terminal to detect the voltage between the first terminal and the second terminal. The leakage voltage signal is used to generate a voltage division detection signal, and the operation control circuit judges whether there is a leakage circuit between the first end point and the second end point according to the leakage voltage signal.

The present invention provides an embodiment, in that the voltage division detection module includes a third voltage division circuit and a second analog-to-digital conversion circuit, wherein the third voltage division circuit has a fifth voltage division unit and a sixth voltage division unit, the The fifth voltage division unit is coupled to the ground terminal and the voltage supply circuit, the sixth voltage division unit is coupled to the second terminal, and the second analog-to-digital conversion circuit is coupled to the fifth voltage division unit and the sixth voltage division unit. Between the voltage units, the second voltage division signal of the second voltage division circuit is received and converted into the voltage division detection signal to be sent to the operation control circuit.

Description of drawings

FIG. 1 : It is a block diagram of a circuit sensing device according to an embodiment of the present invention.

FIG. 2 : It is a block diagram of a detailed circuit of a voltage detection device according to an embodiment of the present invention.

FIG. 3A is a waveform diagram of an abnormal detection signal according to an embodiment of the present invention.

FIG. 3B : It is a schematic diagram of abnormality of the circuit under test caused by circuit deformation according to an embodiment of the present invention.

FIG. 3C : It is a schematic diagram of abnormality of the circuit under test caused by line debris according to an embodiment of the present invention.

FIG. 3D : It is a schematic diagram of abnormality of the circuit under test caused by line deformation and line debris according to an embodiment of the present invention.

FIG. 4 : It is a waveform diagram of a normal detection signal according to an embodiment of the present invention.

FIG. 5 is a waveform diagram of a normal detection signal according to another embodiment of the present invention.

[Description of main component symbols]

1: Circuit sensing device 10: Circuit to be tested

20: Voltage power supply circuit 22: Voltage generation circuit

24: Current limiting element 30: Voltage detection circuit

32: Voltage detection module 3222: The first gain unit

3224: The first voltage divider circuit 32242: The first voltage divider unit

32244: Second voltage divider unit 3226: Second gain unit

3242: The third gain unit 3244: The second voltage divider circuit

32442: The third voltage dividing unit 32444: The fourth voltage dividing unit

3246: The fourth gain unit 34: Voltage division detection module

342: The third voltage divider circuit 3422: The fifth voltage divider unit

3424: The sixth voltage dividing unit 36: The first analog-to-digital conversion circuit

38: Second analog-to-digital conversion circuit 40: Operation control circuit

42: Operation result C: Capacitance

DET: detection signal I _Max : maximum current

L: Leakage circuit R: Resistance

V ₁ : voltage signal V ₂ : constant voltage

V _D1 : the first divided voltage signal V _D2 : the second divided voltage signal

V _D3 : the third divided voltage signal V _DET : detection voltage signal

V _DIFF : differential signal V _G1 : first gain signal

V _G2 : second gain signal V _G3 : third gain signal

V _G4 : fourth gain signal ΔV _n : voltage change

ΔV _n+1 : next voltage change P1 : first probe

P2: second probe T1: first endpoint

T11: line deformation T2: second endpoint

T22: line debris mode 1: mode one

mode 2: mode two mode 3: mode three

detailed description

In order to have a further understanding and understanding of the characteristics of the present invention and the achieved effects, the following examples and explanations are attached hereto:

In view of the existing conventional circuit sensing device, the detection current is too small to detect the derived problems, accordingly, the present invention proposes a circuit sensing device to solve the current problem caused by the conventional conventional technology Detection sensitivity and consideration of the problem of converting the current into a voltage signal with an impedance element.

In the following, the characteristics and matching structure of a circuit sensing device disclosed by the present invention will be further described:

First, please refer to FIG. 1 , which is a block diagram of a circuit sensing device according to an embodiment of the present invention. As shown in the figure, the circuit sensing device 1 of the present invention is used to detect the circuit 10 to be tested. The circuit 10 to be tested has a first terminal T1 and a second terminal T2. The needle P1 and the second probe P2 respectively contact the first terminal T1 and the second terminal T2 to form an electrical connection. The circuit sensing device 1 includes a voltage power supply circuit 20 , a voltage detection circuit 30 and an operation control circuit 40 . The voltage power supply circuit 20 is used to generate a voltage signal V ₁ , the voltage power supply circuit 20 of this embodiment can be regarded as a constant voltage source, the voltage signal V ₁ can be a constant voltage source signal, and the voltage signal V ₁ is passed through the first The terminal T1 and the second terminal T2 are supplied to the circuit under test 10, so that the circuit under test 10 has a constant voltage V ₂ between the first terminal T1 and the second terminal T2, when the circuit is in an ideal state , the voltage signal V ₁ is equivalent to the constant voltage V ₂ . The voltage detection circuit 30 is also coupled to the first terminal T1 and the second terminal T2, and the voltage detection circuit 30 is connected in parallel to the circuit under test 10 and the voltage power supply circuit 20 based on the principle of voltage detection, Therefore, detecting the detection voltage signal V _DET corresponding to the voltage signal V ₁ on the circuit under test 10 is equivalent to detecting the The voltage signal V _DET is detected to generate a detection signal DET and sent to the calculation control circuit 40 so that the calculation control circuit 40 performs calculation according to the detection signal DET to generate a calculation result 42 .

Continuing with the above, since the operation result 42 corresponds to at least one voltage change ΔV _n of the detection signal DET (as shown in FIG. 3A ), the operation control circuit 40 judges the voltage change of the detection signal DET according to the operation result 42 Whether ΔV _n is less than the first threshold value ΔV ₁ (as shown in FIG. 3A ), thus judging whether the detection signal DET is abnormal, when the voltage change ΔV _n is less than the first threshold value ΔV ₁ , the operation control circuit 40 It is determined that the detection signal DET is abnormal, and thus the circuit under test is determined to be abnormal. In addition, the voltage detection circuit 30 includes a voltage detection module 32 and a voltage division detection module 34, the first end P1 and the second end P2 of the circuit under test 10 are detected by the voltage detection module 32 The voltage difference, and the voltage division detection module 34 detects the insulation state between the first end P1 and the second end P2.

Please also refer to FIG. 2 , which is a block diagram of a detailed circuit of a circuit sensing device according to an embodiment of the present invention. As shown in the figure, the voltage power supply circuit 20 includes a voltage generating circuit 22 and a current limiting element 24, wherein the voltage generating circuit 22 generates the voltage signal V ₁ , and the current limiting element 24 is coupled to the voltage generating circuit 22 and the under-test Between the circuits 10, and limit the maximum current value _{I Max} corresponding to the voltage signal V1; the voltage detection circuit 30 includes a voltage detection module 32, which is coupled between the voltage power supply circuit 20 and the circuit 10 to be tested, To detect the detection voltage signal V _DET , especially coupled between the voltage supply circuit 20 and the first terminal T1 to detect the detection voltage signal V _DET . Wherein the voltage detection module 32 includes a first detection circuit 322, a second detection circuit 324 and a differential unit 326, the first detection circuit 322 is coupled between the voltage supply circuit 20 and the first terminal T1 , the second detection circuit 324 is coupled to the second terminal T2, the differential unit 326 is coupled to the first analog-to-digital conversion circuit 36, that is, the voltage detection module 32 is coupled to the first analog-to-digital conversion circuit 36 , for outputting the detection signal DET to the operation control circuit.

Wherein, the first detection circuit 322 includes a first gain unit 3222, a first voltage dividing circuit 3224 and a second gain unit 3226, and the first gain unit 3222 is coupled between the voltage supply circuit 20 and the first terminal T1 , the first voltage dividing circuit 3224 is coupled to the output end of the first gain unit 3222, especially the first voltage dividing unit 32242 of the first voltage dividing circuit 3224 is coupled to the output end of the first gain unit 3222, the The second voltage dividing unit 32244 of the first voltage dividing circuit 3224 is coupled between the first voltage dividing unit 32242 and the ground, thus receiving the first gain signal V _G1 of the first gain unit 3222 , and the second gain unit 3226 is coupled to the first voltage dividing circuit 3224, especially between the first voltage dividing unit 32242 and the second voltage dividing unit 32244, thus receiving the first voltage dividing signal V of the first voltage dividing circuit 3224 _D1 to correspondingly generate a second gain signal V _G2 , the output end of the second gain unit 3226 is coupled to the differential unit 326 , and the second gain signal V _G2 is output to the differential unit 326 .

The second detection circuit 324 includes a third gain unit 3242, a second voltage dividing circuit 3244 and a fourth gain unit 3246, the third gain unit 3242 is coupled between the second terminal T2, and the second voltage dividing circuit 3244 is coupled connected to the output end of the third gain unit 3242, especially the third voltage dividing unit 32442 of the second voltage dividing circuit 3244 is coupled to the output end of the third gain unit 3242, the fourth voltage dividing circuit 3244 The voltage dividing unit 32444 is coupled between the third voltage dividing unit 32442 and the ground, thus receiving the third gain signal V _G3 of the third gain unit 3242, and the fourth gain unit 3246 is coupled to the second voltage dividing circuit 3244, especially coupled between the third voltage dividing unit 32442 and the fourth voltage dividing unit 32444, thus receiving the second voltage dividing signal V _D2 of the second voltage dividing circuit 3244 to generate the fourth gain signal correspondingly V _G4 , the output terminal of the fourth gain unit 3246 is coupled to the differential unit 326 to output the fourth gain signal V _G4 to the differential unit 326 .

The differential unit 326 includes a differential amplifier 3262 and a plurality of impedance units 3264, 3266. The positive input terminal of the differential amplifier 3262 is coupled to the first impedance unit 3264 to receive the second gain signal V _G2 . The negative input terminal of the dynamic amplifier 3262 is coupled to the second impedance unit 3266 to receive the fourth gain signal V _G4 , and the first analog-to-digital conversion circuit 36 is coupled to the output terminal of the differential unit 326 and the operation control circuit 40 , to receive the differential signal V _DIFF generated by the differential unit 326 and output the detection signal DET to the operation control circuit 40 .

In other words, the first gain unit 3222 and the third gain unit 3242 receive the detection voltage signal V _DET corresponding to the voltage signal V ₁ , thereby generating the first gain signal V _G1 and the third gain signal V _G3 correspondingly, and output to the first voltage dividing circuit 3224 and the second voltage dividing circuit 3244, the first voltage dividing circuit 3224 provides the first voltage dividing signal V _D1 to the second gain unit 3226 according to the first gain signal V _G1 , The second voltage dividing circuit 3244 provides the second voltage dividing signal V _D2 to the fourth gain unit 3246 according to the third gain signal V _G3 , so that the second gain unit 3226 and the fourth gain unit 3246 respectively generate The second gain signal V _G2 and the fourth gain signal V _G4 are sent to the differential unit 326 to correspondingly output the differential signal V _DIFF to the first analog-to-digital conversion circuit 36, so that the first analog-to-digital conversion circuit 36 converts the differential signal V _DIFF into the detection signal DET and outputs it to the operation control circuit 40 .

In addition, the voltage detection circuit 30 further includes a voltage division detection module 34, which includes a third voltage division circuit 342, and is coupled to the second analog-to-digital conversion circuit 38, wherein the third voltage division circuit 342 has a fifth division Voltage unit 3422 and sixth voltage dividing unit 3424, the fifth voltage dividing unit 3422 is coupled to the ground terminal GND and the voltage power supply circuit 20, especially the ground terminal GND and the voltage generating circuit 22, the sixth voltage dividing unit The unit 3424 is coupled to the fifth voltage dividing unit 3422 and the second terminal T2, and the second analog-to-digital conversion circuit 38 is coupled between the fifth voltage dividing unit 3422 and the sixth voltage dividing unit 3424 to receive The third voltage-divided signal V _D3 of the third voltage-dividing circuit 342 is converted into the voltage-divided detection signal DIV.

That is, the voltage division detection module 34 is coupled between the voltage supply circuit 20 and the circuit under test 10 to detect the first terminal T1 and the first terminal T1 through the first probe P1 and the second probe P2. A leakage voltage signal between the second terminals T2, that is, the above-mentioned third divided voltage signal V _D3 , generates the divided voltage detection signal DIV, and the operation control circuit 40 judges according to the divided voltage detected signal DIV Whether there is a leakage circuit L between the first terminal T1 and the second terminal T2, that is, to judge the insulation state between the first terminal T1 and the second terminal T2, the ideal state of the general circuit 10 to be tested is The value of the third divided voltage signal V _D3 is 0, that is, the capacitance C of the leakage circuit L is 0 and the resistance R is infinite, but in an unideal circuit state, the capacitance C is not 0 and the resistance R is not infinite, so the The value of the divided voltage detection signal DIV is not 0.

Please refer to FIG. 2 and FIG. 3A together, which is an abnormal waveform diagram of the circuit under test according to an embodiment of the present invention. As shown in the figure, the circuit sensing device 1 of the present invention detects the detection voltage signal V _DET in the voltage detection module 50 and generates the detection signal DET, so that the operation control circuit 40 generates the operation result 42, And when the voltage change ΔV _n is less than the first threshold value ΔV ₁ , the operation control circuit 40 determines that the detection signal DET is abnormal, and thus determines that the circuit under test is abnormal, and the operation result 42 will be presented as shown in the figure 3A shown in the waveform diagram, and when the voltage change ΔVn is a negative voltage difference, the operation control circuit 40 obtains the maximum breakover voltage MAX according to the negative voltage difference, and enters the mode 2 mode 2 from mode 1, the operation When the control circuit 40 calculates the positive voltage difference after the negative voltage difference (that is, the next voltage change ΔV _n+1 ) is greater than the second threshold value ΔV ₂ , the operation control circuit 40 obtains the minimum breakover voltage according to the positive voltage difference MIN, and from mode 2 mode 2 to mode 3 mode 3, the operation control circuit 40 generates correction data D according to the maximum transition voltage MAX and the minimum transition voltage MIN, and the correction data D is a correction reference data for the circuit under test 10 . As shown in FIG. 3B, FIG. 3C and FIG. 3D, this embodiment is based on the above-mentioned abnormality of the detection signal DET caused by the line deformation T11 as an example, and the cause of the above-mentioned abnormality of the detection signal DET is more likely to be the first There is a line sundry T22 between the lines corresponding to the end T1 and the second end T2, or the line deformation T11 and the line sundries T22 are combined, resulting in an abnormal detection signal DET, so the operation control circuit 40 is It is determined that the circuit under test 10 is abnormal.

In addition, as shown in FIG. 4 , when the circuit sensing device 1 does not detect any abnormality, it will present a sloping straight line, that is, the voltage change ΔV _n is always greater than the first threshold value ΔV ₁ . In addition, as shown in FIG. 5 , when the circuit sensing device 1 detects that the voltage change ΔV _n is always greater than the first threshold value ΔV ₁ , it may be a curve instead of a sloping straight line.

The above-mentioned first voltage dividing unit 32242, second voltage dividing unit 32244, third voltage dividing unit 32422, fourth voltage dividing unit 32424, 3422, fifth voltage dividing unit 3424 and sixth voltage dividing unit are impedance elements. It can be a semiconductor element or a resistor. The above-mentioned 3222 first gain unit, 3226 second gain unit, 3242 third gain unit and 3246 fourth gain unit are operational amplifiers. The above-mentioned current limiting element 24 is an impedance element or a transistor. The above-mentioned first analog-to-digital conversion circuit 36 and second analog-to-digital conversion circuit 38 are general conversion circuits for converting analog signals into digital signals, so the signal conversion process will not be repeated here.

It can be known from the above description that the voltage sensing device ₁ of the present invention provides the voltage signal V1 to detect whether the circuit under test 10 is abnormal, so the voltage sensing device 1 of the present invention does not need to consider the matching of current signals The impedance element is converted into a voltage signal, and the abnormal situation shown in Figure 3B, Figure 3C and Figure 3D is only an instantaneous voltage change. If the current detection method is used, it is difficult to detect the current change. Therefore, the voltage sensing method of the present invention The detection sensitivity of the device 1 is better.

The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Anyone familiar with this field Those skilled in the art, without departing from the scope of the technical solution of the present invention, may use the technical content disclosed above to make some changes or modify them into equivalent embodiments with equivalent changes. Technical Essence of the Invention Any simple modifications, equivalent changes and modifications made to the above embodiments still fall within the scope of the technical solutions of the present invention.

Claims (9)

1. A circuit sensing device for detecting a circuit under test having a first terminal and a second terminal, the circuit sensing device comprising:

a voltage power circuit coupled to the first terminal and the second terminal for generating a voltage signal to the circuit to be tested;

a voltage detection circuit coupled to the first terminal and the second terminal and coupled to the voltage power circuit in parallel, the voltage detection circuit detecting a detection voltage signal corresponding to the voltage signal at the first terminal and the second terminal to generate a detection signal; and

the operation control circuit is coupled with the voltage detection circuit, obtains an operation result according to the detection signal, and judges whether at least one voltage change of the detection signal is smaller than a first threshold value according to the operation result.

2. The circuit sensing device of claim 1, wherein the voltage supply circuit comprises:

a voltage generating circuit for generating the voltage signal; and

and the current limiting element is coupled between the voltage generating circuit and the circuit to be tested and limits the maximum current value corresponding to the voltage signal.

3. The circuit sensing device of claim 1, wherein the operation control circuit performs an operation according to a plurality of voltage values corresponding to the detection signal to obtain the operation result, the operation result corresponds to the voltage variation, and the operation control circuit determines that the circuit under test is abnormal when the voltage variation is smaller than the first threshold.

4. The circuit sensing device of claim 3, wherein the operation control circuit obtains a maximum transition voltage according to the negative voltage difference when the voltage changes to the negative voltage difference, obtains a minimum transition voltage according to the positive voltage difference when the operation control circuit obtains a minimum transition voltage according to the positive voltage difference after the negative voltage difference is greater than a second threshold value, and generates the correction data according to the maximum transition voltage and the minimum transition voltage.

5. The circuit sensing device as claimed in claim 1, wherein the voltage detection circuit comprises a voltage detection module coupled between the voltage source circuit and the circuit under test and coupled to a first analog-to-digital conversion circuit outputting the detection signal to the operation control circuit for detecting the detection voltage signal, and the voltage detection module comprises:

a first detection circuit coupled to the voltage source circuit and the first terminal;

a second detection circuit coupled to the second terminal; and

a differential unit having a positive input terminal coupled to the first detection circuit and a negative input terminal coupled to the second detection circuit.

6. The circuit-sensing device of claim 5, wherein the first detection circuit comprises:

a first gain unit coupled to the voltage source circuit and the first terminal;

a first voltage dividing circuit coupled to the first gain unit and having a first voltage dividing unit and a second voltage dividing unit; and

a second gain unit coupled between the first voltage divider and the second voltage divider and coupled to the positive input of the differential unit.

7. The circuit-sensing device of claim 5, wherein the second detection circuit comprises:

a third gain unit coupled to the second terminal;

a second voltage dividing circuit coupled to the third gain unit and having a third voltage dividing unit and a fourth voltage dividing unit; and

a fourth gain unit coupled between the third voltage division unit and the fourth voltage division unit and coupled to the negative input terminal of the differential unit.

8. The circuit sensing device as claimed in claim 1, wherein the voltage detection circuit further comprises a voltage division detection module coupled between the voltage source circuit and the circuit under test and coupled to a second analog-to-digital conversion circuit for detecting a leakage voltage signal between the first terminal and the second terminal and generating a voltage division detection signal, and the operation control circuit determines that a leakage loop exists between the first terminal and the second terminal according to the leakage voltage.

9. The circuit sensing device as claimed in claim 8, wherein the voltage division detecting module comprises:

and a third voltage division circuit having a fifth voltage division unit and a sixth voltage division unit, wherein the fifth voltage division unit is coupled to the ground terminal and the voltage power supply circuit, the sixth voltage division unit is coupled to the second terminal, and the second analog-to-digital conversion circuit is coupled between the fifth voltage division unit and the sixth voltage division unit, receives a fifth voltage division signal of the fifth voltage division unit, and converts the fifth voltage division signal into the voltage division detection signal.

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