Insulation detection circuit, insulation detection method and detection controller

Abstract

The present invention discloses an insulation detection circuit, an insulation detection method, and a detection controller, wherein the circuit includes: at least two detection branches, each branch including: a pair of probes, respectively used to connect to the two ends of the component to be detected; a transimpedance amplifier, connected to the output ends of the pair of probes; a follower, connected to the transimpedance amplifier; the follower includes a first operational amplifier, and has a first negative feedback loop formed by a first diode, and a second negative feedback loop formed by a second diode and a resistor; an inverting amplifier, wherein the output end at the positive electrode of the second diode in each detection branch is connected to the negative input end of the inverting amplifier, and the inverting amplifier is used to receive and reverse the output voltage of each detection branch; the insulation detection circuit has a first state in which each detection branch is insulated, and the inverting amplifier outputs a first voltage value; and a second state in which the inverting amplifier outputs a second voltage value when at least one component to be detected is short-circuited. The circuit of the present invention has high detection efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit performance detection, and in particular to an insulation detection circuit, an insulation detection method and a detection controller. Background Art

[0002] In the modern electronics industry, printed circuit board (PCB) components are widely used. With the increasing multifunctionality and miniaturization of electronic products, the line width and line spacing of PCBs are shrinking, and the number of layers is increasing, placing higher demands on PCB quality testing. To ensure the quality of PCBs, all lines on the PCB must be tested for continuity and insulation. The insulation test actually measures the resistance between non-conductive lines on the PCB, and insulation resistance is the most basic insulation indicator for electrical equipment and circuits. In the current electronics industry, contact testing of PCBs is often used to measure insulation resistance. This involves fully contacting a probe connected to the test circuit with a pad or hole, applying the required high voltage to two previously insulated lines for a period of time (when the circuit test conditions enter a steady state). The voltage on the lines is then measured to determine the insulation condition.

[0003] However, as the integration of electronic products increases and the density of circuit board components increases, the efficiency of testing components on the circuit board one by one is too low, affecting the production efficiency of end customers. Summary of the Invention

[0004] Therefore, in order to solve the problem of low efficiency of the insulation detection method of circuit board components in the prior art, the present application provides an insulation detection circuit, an insulation detection method corresponding to the insulation detection circuit, and a detection controller for executing the method.

[0005] To this end, according to a first aspect, the present invention provides an insulation detection circuit, comprising:

[0006] At least two detection branches, each detection branch includes:

[0007] A pair of probes, respectively used to connect to the two ends of the object to be tested;

[0008] a transimpedance amplifier connected to the output ends of the pair of probes;

[0009] A follower is connected to the transimpedance amplifier; the follower includes a first operational amplifier, and the first operational amplifier has a first negative feedback loop formed by a first diode and a second negative feedback loop formed by a second diode and a resistor; the anode of the first diode is connected to the output terminal of the first operational amplifier, and the cathode is connected to the negative input terminal of the first operational amplifier; the cathode of the second diode is connected to the output terminal of the first operational amplifier, and the anode is connected to the resistor, and the other end of the resistor is connected to the negative input terminal of the first operational amplifier;

[0010] An inverting amplifier, wherein the output terminal between the anode of the second diode of each detection branch and the resistor is connected to the negative input terminal of the inverting amplifier, and the inverting amplifier is used to receive the output voltage of each detection branch and invert it;

[0011] The insulation detection circuit has a first state in which the detected component corresponding to each detection branch is insulated and the reverse amplifier outputs a first voltage value, and a second state in which the detected component corresponding to at least one detection branch is short-circuited and the reverse amplifier outputs a second voltage value.

[0012] Furthermore, each detection branch further includes:

[0013] The branch control switch is arranged on the detection branch and is used to control the on and off of the corresponding detection branch.

[0014] Furthermore, the insulation detection circuit further includes:

[0015] The detection controller is connected to the output end of the reverse amplifier and is used to control the on and off of each branch control switch when receiving the second voltage value, so as to perform group detection on the components to be detected corresponding to each detection branch to obtain the short-circuited components to be detected.

[0016] Furthermore, the detection controller uses a dichotomy method to control the on and off of each branch control switch.

[0017] According to a second aspect, the present invention further provides an insulation detection method based on any insulation detection circuit in the first aspect, comprising the following steps:

[0018] Get the voltage output by the inverting amplifier;

[0019] When the reverse amplifier outputs a first voltage value, a detection result is obtained that all the components to be detected corresponding to the detection branches are insulated;

[0020] When the reverse amplifier outputs the second voltage value, a detection result is obtained that the to-be-detected component corresponding to at least one detection branch among all the detection branches is short-circuited.

[0021] Furthermore, each detection branch further includes a branch control switch, which is used to control the on / off of the corresponding detection branch; when the reverse amplifier outputs a second voltage value, after obtaining a detection result that at least one detection branch corresponding to the to-be-detected component in all the detection branches is short-circuited, the method further includes the following steps:

[0022] Divide all detection branches into a first part and a second part;

[0023] Sequentially controlling the branch control switch corresponding to the detection branch of the first part and the branch control switch corresponding to the detection branch of the second part to close, and obtaining the voltage corresponding to the output of the reverse amplifier;

[0024] The detection branch corresponding to the second voltage value output by the reverse amplifier is further divided into a first part and a second part, and the above control and detection steps are repeated until a short-circuited component to be detected is obtained.

[0025] According to the third aspect, the present invention also provides a detection controller, comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions that can be executed by a processor, and the instructions are executed by the at least one processor so that the at least one processor executes any insulation detection method described in the second aspect above.

[0026] The technical solution provided by the present invention has the following advantages:

[0027] 1. The insulation detection circuit provided by the present invention has at least two detection branches, so that the insulation detection circuit can simultaneously perform insulation detection on at least two parts to be detected. The output end of each detection branch is connected to the negative input end of the same inverting amplifier, so that only one voltage data is generated for each detection of at least two parts to be detected. This improves the detection efficiency of the insulation detection circuit while eliminating the need to provide at least two detection controllers (devices for processing voltage data to obtain insulation detection results) to increase detection costs.

[0028] In order to ensure that the reverse amplifier can output an abnormal voltage value (second voltage value) as long as there is a short circuit in one of the components to be detected, a follower is provided with a second negative feedback loop formed by a second diode and a resistor. The cathode of the second diode is connected to the output end of the first operational amplifier, the positive electrode is connected to the resistor, and the other end of the resistor is connected to the negative input end of the operational amplifier, and the output end of the follower is located between the second diode and the resistor. As a result, as long as one of the components to be detected (assuming it is RL1) is short-circuited, the output voltage of the follower in its branch is a fixed value. At this time, if the other component to be detected (assuming it is RL2) is insulated, the voltage output by the detection branch where RL1 is located and applied to the output end of the detection branch where RL2 is located will not enter the loop of the follower in the detection branch where RL2 is located due to the obstruction of the second diode. At the same time, the follower in the detection branch where RL2 is located can maintain the applied voltage, and finally the voltage output by each detection branch to the reverse amplifier is the above-mentioned fixed value. The reverse amplifier outputs the second voltage value after corresponding reversal, which is different from the first voltage value output when all the components to be detected are insulated, thereby realizing the detection indication of abnormal short circuit of the component to be detected.

[0029] 2. The insulation detection circuit provided by the present invention controls the on and off of the corresponding detection branch by setting a branch control switch, and sets a detection controller to be connected with the output end of the reverse amplifier and the branch control switch, so as to control the on and off of each branch control switch when a second voltage value is received, so as to perform group detection on the parts to be detected corresponding to each detection branch, and finally lock the specific parts to be detected that have an abnormal short circuit.

[0030] 3. The insulation detection method provided by the present invention, after the voltage output by the obtained reverse amplifier is a second voltage value and the detection result is obtained that there is a short circuit in the component to be detected corresponding to at least one detection branch in all detection branches, continuously uses a binary search method to perform group tests on the components to be detected corresponding to the detection branches until the specific component to be detected with the abnormal short circuit is finally locked, and the detection locking efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 A schematic structural diagram of the insulation detection circuit provided in Example 1 of the present invention;

[0033] Figure 2A schematic structural diagram of the insulation detection circuit provided in Example 1 of the present invention under scenario 2;

[0034] Figure 3 A schematic structural diagram of the insulation detection circuit provided in Example 1 of the present invention under situation 3;

[0035] Figure 4 Flowchart of the insulation detection method provided in Example 2 of the present invention;

[0036] Figure 5 A schematic diagram of the hardware structure of an electronic device provided in Example 3 of the present invention. DETAILED DESCRIPTION

[0037] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0038] In the description of the present invention, it should be noted that the terms "upper" and "lower" and other terms indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] Example 1

[0040] Figure 1 FIG. 1 shows a schematic diagram of the structure of an insulation detection circuit in one embodiment of the present invention. Figure 1 As shown, the insulation detection circuit includes at least two detection branches ( Figure 1 In the figure, two detection branches are respectively corresponding to the components to be detected RL1 and RL2, and an inverting amplifier is used as an example.

[0041] Among them, such as Figure 1 As shown, the specific structures of the various detection branches are the same. Specifically, each detection branch includes: a pair of probes, a transimpedance amplifier, a follower and an inverting amplifier (the following description is based on the detection branch where the component to be detected RL1 is located as an example).

[0042] A pair of probes SL1 and SL2 are respectively used to connect to two ends of the component to be detected RL1.

[0043] The transimpedance amplifier is connected to the output terminals of a pair of probes SL1 and SL2. Figure 1 A transimpedance amplifier is shown, which includes a second operational amplifier U1A, a capacitor C1, a capacitor C2, a capacitor C4 and a resistor R5. Specifically, the output ends of a pair of probes SL1 and SL2 are connected to the negative input terminal of the second operational amplifier U1A, the positive input terminal of the second operational amplifier U1A is grounded, the capacitor C1 and the resistor R5 are connected in parallel and connected between the negative input terminal and the output terminal of the second operational amplifier U1A, one end of the capacitor C2 is connected to the negative power supply terminal of the second operational amplifier U1A, and the other end is grounded, and one end of the capacitor C4 is connected to the positive power supply terminal of the second operational amplifier U1A, and the other end is grounded.

[0044] The follower is connected to the transimpedance amplifier. Figure 1 As shown, the follower and the transimpedance amplifier can be connected via a resistor R6.

[0045] like Figure 1 As shown, the follower includes a first operational amplifier U2A, which has a first negative feedback loop formed by a first diode D1 and a second negative feedback loop formed by a second diode D2 and a resistor R7. The anode of the first diode D1 is connected to the output of the first operational amplifier U2A, and the cathode is connected to the negative input of the first operational amplifier U2A. The cathode of the second diode D2 is connected to the output of the first operational amplifier U2A, and the anode is connected to the resistor R7. The other end of the resistor R7 is connected to the negative input of the first operational amplifier U2A. As with the transimpedance amplifier, the negative power supply terminal and the positive power supply terminal of the first operational amplifier U2A can also be provided with grounded capacitors C3 and C5, respectively.

[0046] like Figure 1 As shown, the anode of the second diode D2 and the resistor R7 form the output terminal of the follower, which is connected to the negative input terminal of the inverting amplifier. The inverting amplifier is used to receive the output voltage of each detection branch and invert it.

[0047] Specifically, if Figure 1 As shown, each detection branch and the inverting amplifier may be connected via a resistor R3.

[0048] Figure 1 An inverting amplifier is shown, which includes a third operational amplifier U5A, a resistor R18, a capacitor C11 and a capacitor C13. The resistor R18 is arranged between the negative input terminal and the output terminal of the third operational amplifier U5A, and the capacitor C11 and the capacitor C13 are grounding capacitors of the negative power supply terminal and the positive power supply terminal of the third operational amplifier U5A, respectively.

[0049] Specifically, the detection voltage of the insulation detection circuit can be between 50V and 250V. Figure 1 The following is illustrated by taking 250V as an example.

[0050] The insulation detection circuit of this embodiment has a first state in which the components to be detected corresponding to each detection branch are insulated and the reverse amplifier outputs a first voltage value, and a second state in which the components to be detected corresponding to at least one detection branch are short-circuited and the reverse amplifier outputs a second voltage value.

[0051] Specifically, Figure 1 As shown in the figure, the insulation detection circuit includes two detection branches corresponding to the components to be detected RL1 and RL2. The insulation conditions of the components to be detected RL1 and RL2 include the following three types:

[0052] 1. As Figure 1 As shown, the components to be tested RL1 and RL2 are both insulated.

[0053] In an ideal state, the impedance of the test pieces RL1 and RL2 is infinite. However, in order to facilitate the marking and simulation test of the insulation detection circuit in practical applications, Figure 1 In the example, the impedance of both devices is indicated as 100 MΩ. At this point, the output voltages of the transimpedance amplifier and follower in the detection branch (assuming the first detection branch) where the device to be detected RL1 is located and the detection branch (assuming the second detection branch) where the device to be detected RL2 is located are both close to 0 V. In other words, the output voltages of the first and second detection branches are the same and both close to 0 V. At this point, the inverting amplifier receives the output voltages of the first and second detection branches and inverts them, outputting a first voltage value.

[0054] The parameters of each device are Figure 1 Taking the example shown, the second detection branch is specifically described: at this time, the output voltage of the transimpedance amplifier is -300mV, that is, the voltage at the positive input and negative input of the first operational amplifier U4A is -300mV (the first operational amplifier U4A is virtually shorted in this circuit structure); and the output voltage of the follower is actually the voltage at the end of the resistor R10 in the second negative feedback loop, which comes from the voltage at the negative input of the first operational amplifier U4A connected to the other end of the resistor R10, that is, the output voltage is -300mV (at this time, the second negative feedback loop is turned on, but the current is extremely small, so it can be considered that the voltages at both ends of the resistor R10 are the same). In other words, the first voltage value is -300mV.

[0055] 2. If Figure 2 As shown, the components to be tested RL1 and RL2 are both abnormally short-circuited.

[0056] Ideally, the impedance of the components RL1 and RL2 to be tested is 0. However, in actual applications, based on the characteristics of the circuit board, when the impedance of the components RL1 and RL2 to be tested is at the Ω level (relative to the KΩ level and MΩ level), it is generally considered that the components RL1 and RL2 to be tested are in an abnormal short-circuit state that does not meet the insulation standard. Figure 2 The impedance of both is exemplarily indicated as 100Ω: at this time, the conversion voltage of the transimpedance amplifier in the detection branch where the detected component RL1 is located (assuming it is the first detection branch) and the detection branch where the detected component RL2 is located (assuming it is the second detection branch) far exceeds the normal power supply voltage of the op amp, and the second operational amplifier is in a saturated state. If the second operational amplifier is ideally rail-to-rail, the output voltage of the second operational amplifier is -15V at this time; accordingly, the positive input voltage of the first operational amplifier in the follower is -15V, the output voltage of the first operational amplifier is -15V, and the cathode of the second diode is applied with a voltage of -15V, causing the second diode to be turned on, so that the output voltage of the follower is -15V+Vf (at this time, due to the conduction clamping of the second diode, the voltage at the end of the resistor in the second negative feedback loop, that is, the negative input voltage of the first operational amplifier is -15V+Vf); that is, the output voltage of the first detection branch and the second detection branch is the same, and is -15V+Vf. At this time, the inverting amplifier receives the output voltages of the first detection branch and the second detection branch and inverts them to output a second voltage value of -(-15V+Vf).

[0057] The parameters of each device are Figure 2 Taking the example shown, the first detection branch is specifically described: the conversion voltage of the transimpedance amplifier is 250V / 20KΩ*120KΩ=1500V, where 20KΩ is the impedance of the resistor R1, and 120KΩ is the impedance of the resistor R5 (the impedance of RL1 is too small, and its impact on the overall current and voltage of the circuit can be ignored, so it is not included in the calculation). This calculated voltage far exceeds the normal power supply voltage of the op amp, and therefore, the second operational amplifier U1A is in a saturated state. If the second operational amplifier U1A is ideal rail-to-rail, the output voltage of the second operational amplifier U1A is -15V at this time; furthermore, a voltage of -15V is applied to the cathode of the second diode D2 at the first operational amplifier U2A, causing the second diode D2 to conduct, and the output voltage of the follower is -15V+Vf (Vf is the conduction voltage of the second diode D2).

[0058] 3. Figure 3 As shown, one of the components to be detected is insulated (assuming it is the component to be detected RL2 ), while the other component to be detected is abnormally short-circuited (assuming it is the component to be detected RL1 ).

[0059] From the above situation 2, it can be seen that the output voltage of the second operational amplifier (U1A) in the detection branch (assuming it is the first detection branch) where the detected component RL1 is located is -15V. Correspondingly, the voltage at the output end of the follower (that is, the voltage at the anode of the second diode D2) is -15V+Vf.

[0060] From the above situation 1, it can be seen that the output voltage of the transimpedance amplifier in the detection branch (assuming it is the second detection branch) where the second detection component RL2 is located is -300mV (that is, the positive input terminal and the negative input terminal voltage of the first operational amplifier U4A are both -300mV).

[0061] However, unlike situation one, since the output ends of both the first detection branch and the second detection branch are connected to the inverting amplifier U5A, the first detection branch and the second detection branch are in parallel. Therefore, in this case, the -15V+Vf voltage output by the first detection branch will be applied to the output end of the second detection branch. At this time, in the second detection branch, the anode voltage of the second diode D4 is -15V+Vf, and the second diode D4 cannot conduct, thereby causing the first diode D3 in the first negative feedback loop to conduct. The cathode voltage of the first diode D3 is -300mV, and the anode voltage is -300mV+Vf (the actual measurement is approximately 290mV). The voltages across the resistor R10 in the second negative feedback loop are -300mV and -15V+Vf, respectively, causing the output voltage of the follower to flow normally from the end of R10, thereby allowing the output voltage of the follower in the second detection branch to remain at the applied voltage -15V+Vf. The output voltages of the first detection branch and the second detection branch are the same, and are -15V+Vf. At this time, the inverting amplifier receives the output voltages of the first detection branch and the second detection branch and inverts them to output a second voltage value of -(-15V+Vf).

[0062] It should be noted that when there are three or more detection branches, if some but not all detection branches are abnormally short-circuited, the above situation three can be understood with reference to the content.

[0063] Therefore, the insulation detection circuit in this embodiment is configured to have at least two detection branches, so that the insulation detection circuit can simultaneously perform insulation detection on at least two components to be detected, and the output end of each detection branch is connected to the negative input end of the same inverting amplifier, so that only one detection result is generated for each detection of at least two components to be detected. This improves the detection efficiency of the insulation detection circuit while eliminating the need to set up at least two detection controllers to increase the detection cost.

[0064] In order to ensure that the reverse amplifier can output an abnormal voltage value (second voltage value) as long as there is a short circuit in one of the components to be detected, a follower is provided with a second negative feedback loop formed by a second diode and a resistor, the cathode of the second diode is connected to the output end of the first operational amplifier, the anode is connected to the resistor, the other end of the resistor is connected to the negative input end of the operational amplifier, and the output end of the follower is located between the second diode and the resistor, so that as long as one of the components to be detected (assuming it is RL1) is short-circuited, the output voltage of the follower in its branch is a fixed value, and at this time if the other component to be detected (assuming it is RL2) is insulated, the voltage output by the detection branch where RL1 is located and applied to the output end of the detection branch where RL2 is located will not enter the loop of the follower in the detection branch where RL2 is located due to the obstruction of the second diode, and at the same time, the output of the follower in the detection branch where RL2 is located can be maintained as the applied voltage, so that the voltage output by each detection branch to the reverse amplifier is the above-mentioned fixed value, and the reverse amplifier outputs the second voltage value after corresponding reversal, which is different from the first voltage value output when all components to be detected are insulated, thereby realizing the detection indication of abnormal short circuit of the component to be detected.

[0065] As an implementation method in this embodiment, Figure 1 As shown, each detection branch can also be set to include a branch control switch (such as switch S1 in the detection branch where RL1 is located, and switch S2 in the detection branch where RL2 is located). The branch control switch is set on the detection branch to control the on and off of the corresponding detection branch.

[0066] As an implementation method of this embodiment, the insulation detection circuit may further include a detection controller, which is connected to the output end of the reverse amplifier and is used to control the on and off of each branch control switch when receiving the second voltage value, so as to perform group detection on the components to be detected corresponding to each detection branch to obtain short-circuited components to be detected. Exemplarily, the detection controller uses a binary method to control the on and off of each branch control switch. Of course, in order to convert the output voltage of the reverse amplifier into digital information that can be processed by the detection controller, an analog-to-digital converter is provided between the reverse amplifier and the detection controller.

[0067] Example 2

[0068] Figure 4 The flowchart of the insulation detection method in one embodiment of the present invention is shown. It is implemented based on the insulation detection circuit in the above embodiment 1. It can be executed by an electronic device electrically connected to the reverse amplifier in the above embodiment 1 and capable of obtaining the output voltage of the reverse amplifier, such as the detection controller in one embodiment of the above embodiment 1, which is an electronic device that can execute this method. Specifically, Figure 4 As shown, the method includes the following steps:

[0069] Step S401: obtaining the voltage output by the inverting amplifier.

[0070] Step S402: When the output of the reverse amplifier is the first voltage value, a detection result is obtained that all the components to be detected corresponding to the detection branches are insulated.

[0071] Step S403: When the output of the reverse amplifier is the second voltage value, a detection result is obtained that at least one detection branch among all the detection branches has a short circuit in the component to be detected.

[0072] As an optional implementation of the embodiment of the present invention, each detection branch further includes a branch control switch, which is used to control the on / off of the corresponding detection branch. In this case, the following steps may be further included after step S403:

[0073] Step S404: Divide all detection branches into a first part and a second part.

[0074] Step S405: sequentially controlling the branch control switches corresponding to the detection branches of the first part and the branch control switches corresponding to the detection branches of the second part to be closed, and obtaining the voltage corresponding to the output of the inverting amplifier.

[0075] Step S406: further divide the detection branch corresponding to the portion where the voltage output by the reverse amplifier is the second voltage value into a first portion and a second portion, and repeat the above control and detection steps until a short-circuited component to be detected is obtained.

[0076] That is, the insulation detection method in this embodiment, after the voltage output by the obtained reverse amplifier is the second voltage value and the detection result is obtained that there is a short circuit in the component to be detected corresponding to at least one detection branch in all detection branches, continuously uses the binary search method to perform group tests on the components to be detected corresponding to the detection branches until the specific component to be detected that is abnormally short-circuited is finally locked, and the detection locking efficiency is relatively high.

[0077] The specific details of the above insulation detection method can be understood by referring to the relevant description and effects of the insulation detection circuit in Example 1, and will not be repeated here.

[0078] Example 3

[0079] The embodiment of the present invention provides a detection controller, such as Figure 5 As shown, the detection controller may include a processor 51 and a memory 52, wherein the processor 51 and the memory 52 may be connected via a bus or other means. Figure 5 The bus connection is taken as an example.

[0080] The processor 51 may be a central processing unit (CPU). The processor 51 may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or a combination of the above chips.

[0081] Memory 52, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs, non-transitory computer-executable programs, and modules, such as the program instructions / modules corresponding to the insulation detection method in Example 2 of the present invention. Processor 51 executes the non-transitory software programs, instructions, and modules stored in memory 52 to perform various processor functions and data processing, thereby implementing the insulation detection method in Example 2.

[0082] The memory 52 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and application programs required for at least one function; the data storage area may store data created by the processor 51, etc. In addition, the memory 52 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory 52 may optionally include a memory remotely located relative to the processor 51, and these remote memories may be connected to the processor 51 via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0083] The one or more modules are stored in the memory 52 and when executed by the processor 51, perform the following steps: Figure 4 The insulation detection method in the illustrated embodiment.

[0084] The specific details of the above detection controller can be understood by referring to the corresponding descriptions and effects in the above implementation and Example 2, and will not be repeated here.

[0085] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. An insulation detection circuit, characterized in that: include: At least two detection branches, each of the detection branches comprising: A pair of probes, respectively used to connect to the two ends of the object to be tested; a transimpedance amplifier connected to the output ends of the pair of probes; A follower connected to the transimpedance amplifier; the follower includes a first operational amplifier, and the first operational amplifier has a first negative feedback loop formed by a first diode and a second negative feedback loop formed by a second diode and a resistor; the anode of the first diode is connected to the output terminal of the first operational amplifier, and the cathode is connected to the negative input terminal of the first operational amplifier; the cathode of the second diode is connected to the output terminal of the first operational amplifier, and the anode is connected to the resistor, and the other end of the resistor is connected to the negative input terminal of the first operational amplifier; an inverting amplifier, wherein the output end between the anode of the second diode of each detection branch and the resistor is connected to the negative input end of the inverting amplifier, and the inverting amplifier is used to receive and invert the output voltage of each detection branch; The insulation detection circuit has a first state in which the component to be detected corresponding to each detection branch is insulated and the reverse amplifier outputs a first voltage value, and a second state in which the component to be detected corresponding to at least one detection branch is short-circuited and the reverse amplifier outputs a second voltage value.

2. The insulation detection circuit according to claim 1, characterized in that: Each of the detection branches further includes: The branch control switch is arranged on the detection branch and is used to control the on and off of the corresponding detection branch.

3. The insulation detection circuit according to claim 2, characterized in that: Also includes: The detection controller is connected to the output end of the reverse amplifier and is used to control the on and off of each branch control switch when receiving the second voltage value, so as to perform group detection on the components to be detected corresponding to each detection branch to obtain the short-circuited components to be detected.

4. The insulation detection circuit according to claim 3, characterized in that: The detection controller controls the on and off of each of the branch control switches in a binary manner.

5. An insulation detection method based on the insulation detection circuit according to any one of claims 1 to 4, characterized in that: The steps include: Obtaining the voltage output by the inverting amplifier; When the output of the reverse amplifier is the first voltage value, a detection result is obtained that the components to be detected corresponding to all the detection branches are insulated; When the reverse amplifier outputs a second voltage value, a detection result is obtained that the to-be-detected component corresponding to at least one of the detection branches among all the detection branches is short-circuited.

6. The insulation detection method of the insulation detection circuit according to claim 5, characterized in that: Each of the detection branches further includes a branch control switch, the branch control switch being used to control the on / off of the corresponding detection branch; after the step of obtaining a detection result that at least one of the detection branches corresponding to the to-be-detected component is short-circuited in all the detection branches when the output of the reverse amplifier is the second voltage value, the following steps are further included: Dividing all the detection branches into a first part and a second part; sequentially controlling the branch control switch corresponding to the detection branch of the first part and the branch control switch corresponding to the detection branch of the second part to close, and obtaining the voltage corresponding to the output of the inverting amplifier; The detection branch corresponding to the second voltage value output by the reverse amplifier is further divided into a first part and a second part, and the above control and detection steps are repeated until the short-circuited component to be detected is obtained.

7. A detection controller, characterized in that: include: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the one processor, and the instructions are executed by the at least one processor so that the at least one processor executes the insulation detection method described in any one of claims 5-6 above.

Images