CN113189468A - Health state on-line monitoring circuit and system of power device - Google Patents
Health state on-line monitoring circuit and system of power device Download PDFInfo
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- CN113189468A CN113189468A CN202110522289.3A CN202110522289A CN113189468A CN 113189468 A CN113189468 A CN 113189468A CN 202110522289 A CN202110522289 A CN 202110522289A CN 113189468 A CN113189468 A CN 113189468A
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- 230000036541 health Effects 0.000 title claims abstract description 35
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- 230000003862 health status Effects 0.000 claims abstract description 23
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/26—Testing of individual semiconductor devices
- G01R31/27—Testing of devices without physical removal from the circuit of which they form part, e.g. compensating for effects surrounding elements
Abstract
The application discloses power device's health status on-line monitoring circuit includes: a sampling resistor and a voltage signal acquisition circuit; the sampling resistor is connected in series with a gate driving loop of the power device to be measured, the input end of the voltage signal acquisition circuit is connected in parallel with the two ends of the sampling resistor, and the output end of the voltage signal acquisition circuit is connected to the on-line monitoring equipment for the health state of the power device to be measured. The method comprises the steps that a sampling resistor connected in series with a gate driving loop of a power device to be measured and a voltage signal acquisition circuit used for detecting voltages at two ends of the sampling resistor are utilized, the change condition of gate leakage current of the power device to be measured in the switching process is obtained in real time, and therefore the on-line evaluation of the health state of the power device to be measured can be achieved by connecting a controller or a detection device to the output end of the voltage signal acquisition circuit. The application also discloses a health state online monitoring system of the power device, which has the beneficial effects.
Description
Technical Field
The present disclosure relates to circuit detection technologies, and in particular, to a health status online monitoring circuit and system for a power device.
Background
Power devices are widely used in consumer electronics, communication equipment, industrial control, motor drive, and power systems, among others. The system comprises a mobile terminal such as a mobile phone, a personal computer, a notebook computer, an adapter of a server, a UPS power supply and the like; the power supply of the communication station, the base station and the data center; various servo motor controls in industrial application; an alternating current motor in an electric automobile and a high-speed rail is used for driving; solid-state transformers, high-voltage direct-current transmission systems, flexible alternating-current transmission systems and the like in the power grid. When the power device is impacted by excessive current, the dynamic and static characteristic parameters of the power device tend to be degraded, which comprises the following steps: the performance of the power device is aged due to the switching threshold voltage, the dynamic on-resistance, the gate leakage current and the like, and finally the problem of threatening the safety and reliability of the power device is caused. Therefore, to ensure the safety and reliability of the power device, the health status of the power device needs to be evaluated quickly and accurately.
Most of the existing common power device health state evaluation methods rely on detection equipment to measure parameters of the power device off line, and the power device needs to be measured separately. However, this method often cannot accurately and timely obtain the actual situation of the power device in the using process, and obviously does not have a wide application scenario.
The technical problem to be solved by those skilled in the art is to provide a device capable of monitoring the health status of a power device on line.
Disclosure of Invention
The application aims to provide a health state online monitoring circuit and system of a power device, which are used for online monitoring of the health state of the power device.
In order to solve the above technical problem, the present application provides an online health status monitoring circuit for a power device, including: a sampling resistor and a voltage signal acquisition circuit;
the sampling resistor is connected in series with a gate driving loop of the power device to be measured, the input end of the voltage signal acquisition circuit is connected in parallel with the two ends of the sampling resistor, and the output end of the voltage signal acquisition circuit is connected to the on-line monitoring equipment for the health state of the power device to be measured.
Optionally, the voltage signal acquisition circuit specifically includes: the circuit comprises a differential amplifying circuit, an integrating circuit and a peak value detecting circuit;
the input end of the differential amplification circuit is connected in parallel with the two ends of the sampling circuit, the output end of the differential amplification circuit is connected with the input end of the integration circuit, the output end of the integration circuit is connected with the input end of the peak detection circuit, and the output end of the peak detection circuit is used for being connected with the online monitoring equipment.
Optionally, the differential amplifier circuit specifically includes: the circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor and a first operational amplifier;
the first end of the first resistor is connected with the first end of the sampling resistor, the first end of the second resistor is connected with the second end of the sampling resistor, the second end of the first resistor, the first end of the third resistor and the negative input end of the first operational amplifier are connected, the second end of the third resistor, the output end of the first operational amplifier and the input end of the integrating circuit are connected, the second end of the second resistor, the first end of the fourth resistor and the positive input end of the first operational amplifier are connected, and the second end of the fourth resistor is grounded.
Optionally, the integration circuit specifically includes: a fifth resistor, a first capacitor and a second operational amplifier;
the first end of the fifth resistor is connected with the output end of the differential amplification circuit, the second end of the fifth resistor and the first end of the first capacitor are connected with the negative input end of the second operational amplifier, the positive input end of the second operational amplifier is grounded, and the second end of the first capacitor and the output end of the second operational amplifier are connected with the input end of the peak detection circuit.
Optionally, the method further includes: and the sixth resistor is connected in parallel with two ends of the first capacitor.
Optionally, the peak detection circuit specifically includes a first diode and a second capacitor;
the anode of the first diode and the first end of the second capacitor are connected with the input end of the linear isolation circuit, and the second end of the second capacitor is grounded.
Optionally, the method further includes:
and the linear isolation circuit is arranged between the output end of the peak detection circuit and the online monitoring equipment.
Optionally, the linear isolation circuit is specifically a linear optical coupling isolation circuit, a linear capacitance isolation circuit, or a linear magnetic isolation circuit.
In order to solve the above technical problem, the present application further provides an online health status monitoring system for a power device, including the online health status monitoring circuit for a power device described in any one of the above paragraphs, further including:
and the controller is connected with the output end of the voltage signal acquisition circuit and is used for evaluating the health state of the tested power device according to the change of the output voltage of the voltage signal acquisition circuit.
Optionally, the controller evaluates the health state of the power device under test according to the change of the output voltage of the voltage signal acquisition circuit, specifically:
and when the output voltage of the voltage signal acquisition circuit exceeds a first threshold value, determining that the power device to be measured is in an aging state.
The utility model provides a health status on-line monitoring circuit of power device includes: a sampling resistor and a voltage signal acquisition circuit; the sampling resistor is connected in series with a gate driving loop of the power device to be measured, the input end of the voltage signal acquisition circuit is connected in parallel with the two ends of the sampling resistor, and the output end of the voltage signal acquisition circuit is connected to the on-line monitoring equipment for the health state of the power device to be measured. The method comprises the steps that a sampling resistor connected in series with a gate driving loop of a power device to be measured and a voltage signal acquisition circuit used for detecting voltages at two ends of the sampling resistor are utilized, the change condition of gate leakage current of the power device to be measured in the switching process is obtained in real time, and therefore the on-line evaluation of the health state of the power device to be measured can be achieved by connecting a controller or a detection device to the output end of the voltage signal acquisition circuit.
The application also provides a health state online monitoring system of the power device, which has the beneficial effects and is not repeated herein.
Drawings
For a clearer explanation of the embodiments or technical solutions of the prior art of the present application, the drawings needed for the description of the embodiments or prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an online health status monitoring circuit of a power device according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of another online health status monitoring circuit for a power device according to an embodiment of the present disclosure;
fig. 3 is a circuit diagram of a voltage signal acquisition circuit according to an embodiment of the present disclosure;
wherein 100 is a sampling resistor, 200 is a voltage signal acquisition circuit, 201 is a differential amplification circuit, 202 is an integration circuit, 203 is a peak detection circuit, and 204 is a linear isolation circuit.
Detailed Description
The core of the application is to provide a health state online monitoring circuit and system of a power device, which are used for online monitoring the health state of the power device.
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Fig. 1 is a schematic structural diagram of an online health status monitoring circuit of a power device according to an embodiment of the present disclosure.
As shown in fig. 1, the online health state monitoring circuit for a power device provided in the embodiment of the present application specifically includes: a sampling resistor 100 and a voltage signal acquisition circuit 200;
the sampling resistor 100 is connected in series with a gate driving loop of the power device to be measured, the input end of the voltage signal acquisition circuit 200 is connected in parallel with the two ends of the sampling resistor 100, and the output end of the voltage signal acquisition circuit 200 is connected to the online monitoring equipment for the health state of the power device to be measured.
In a specific implementation, the sampling resistor 100 may be connected in series to a ground terminal of a gate driving loop of the power device to be tested to collect gate leakage current of the power device to be tested during a switching process, and the voltage signal collecting circuit 200 may obtain voltages at two ends of the sampling resistor 100 to convert a gate leakage current signal of the power device to be tested into a voltage signal for output, so as to perform detection. By detecting the voltage change at the output end of the voltage signal acquisition circuit 200, the gate leakage current change of the power device to be detected can be obtained. The specific structure of the voltage signal acquisition circuit 200 is designed according to the different devices connected to the online monitoring device. For example, if the on-line monitoring device is a controller such as a single chip microcomputer, the voltage parameter acquisition circuit is required to output a voltage signal in a voltage range corresponding to an analog-to-digital conversion (ADC) pin of the controller. Meanwhile, in order to reduce the influence on the power device to be measured and reduce power consumption, the sampling resistor 100 should select a resistor with a smaller resistance value as much as possible, and therefore the voltage signal acquisition circuit 200 needs to have a signal amplification function so that the signal can be identified by the online monitoring device.
In general, when the magnitude of the gate leakage current of the power device under test is significantly changed (generally significantly increased), the power device under test is considered to be aged. Therefore, in the embodiment of the present application, when it is detected that the peak value of the voltage at the output end of the voltage signal acquisition circuit 200 is significantly increased, it is considered that the power device under test is aged. Based on the structure of the voltage signal acquisition circuit 200 and the type of the power device to be measured, a detection threshold corresponding to the power device to be measured is determined, so that when the voltage of the output end of the voltage signal acquisition circuit 200 exceeds the detection threshold, the power device to be measured is determined to be in an aging state. The number of the detection threshold values can be multiple, so as to correspond to different aging degrees of the tested power device.
Fig. 2 is a schematic structural diagram of another online health status monitoring circuit for a power device according to an embodiment of the present disclosure; fig. 3 is a circuit diagram of a voltage signal acquisition circuit 200 according to an embodiment of the present disclosure.
On the basis of the foregoing embodiment, in the online health state monitoring circuit of a power device provided in the embodiment of the present application, the voltage signal acquisition circuit 200 may specifically include: a differential amplification circuit 201, an integration circuit 202, and a peak detection circuit 203;
the input end of the differential amplification circuit 201 is connected in parallel to the two ends of the sampling circuit, the output end of the differential amplification circuit 201 is connected with the input end of the integration circuit 202, the output end of the integration circuit 202 is connected with the input end of the peak detection circuit 203, and the output end of the peak detection circuit 203 is used for being connected with an online monitoring device.
In practical application, firstly, the gate leakage current of the power device to be measured is amplified for the first time through the differential amplification circuit 201, and common mode noise interference is eliminated; because the output signal of the differential amplification circuit 201 is small and may not be detected, the output signal of the differential amplification circuit 201 is secondarily amplified by the integration circuit 202 to obtain a stable direct-current voltage; the peak value of the output signal of the integrating circuit 202 is then held by the peak detecting circuit 203 for detection by the on-line monitoring device. The health state of the power device to be measured is evaluated on line through the voltage value output by the peak detection circuit 203.
Further, as shown in fig. 3, the differential amplifying circuit 201 may specifically include: a first resistor R1A second resistor R2A third resistor R4A fourth resistor R4And a first operational amplifier OP 1;
wherein, the sampling resistor RshThe first end of the first resistor R is connected with a gate driving circuit IG _ IN point of the power device to be measured1First terminal and sampling resistor RshIs connected to the first terminal of the second resistor R2First terminal and sampling resistor RshIs connected to the second terminal of the first resistor R1Second terminal, third resistor R3Is connected to the negative input of a first operational amplifier OP1Third resistor R3And the output end of the first operational amplifier OP1 is connected with the input end of the integrating circuit 202, and the second resistor R2Second terminal, fourth resistor R4Is connected to the positive input terminal of a first operational amplifier OP1, a fourth resistor R4The second terminal of (a) is grounded.
The sampling resistor R in fig. 3shIs one implementation of the sampling resistor 100 of fig. 1.
By sampling a resistor RshA gate drive circuit connected IN series to the power device to be measured, and an equivalent voltage v corresponding to the gate current (IG _ IN) is obtained through a differential amplifier circuit 201DA：
Wherein the third resistor R3And a first resistor R1The ratio of (a) determines the amplification factor of the differential amplification circuit 201. The amplification factor of the differential amplifier circuit 201 can be adjusted according to actual conditions. A second resistor R2And a fourth resistor R4The resistance value of (b) can also be set according to actual conditions.
The integration circuit 202 may specifically include: fifth resistor R5A first capacitor C1And a second operational amplifier OP 2;
wherein, the fifth resistor R5Is connected to the output terminal of the differential amplifier circuit 201, and a fifth resistor R5Second terminal, first capacitor C1Is connected with the negative input terminal of a second operational amplifier OP2, the positive input terminal of the second operational amplifier OP2 is grounded, and a first capacitor C1And the output terminal of the second operational amplifier OP2 is connected to the input terminal of the peak detection circuit 203.
Subsequently, v is measuredDABy means of the integrating circuit 202, the equivalent voltage value v can be obtainedINT：
Wherein Q isGIs the equivalent gate charge value. Gate charge Q of the power device under test in the turn-on process due to the influence of non-linear factors in the amplifying circuitG,onGate charge Q associated with turn-off processG,offWill exhibit asymmetry such that the gate charge Q isGDrift occurs after a complete switching period of the power device under test, and finally detection errors are brought. For this reason, the online health status monitoring circuit for a power device provided in the embodiment of the present application may further include: is connected in parallel with the first capacitor C1Sixth resistor R at two ends6. By means of a first capacitor C1The two ends of the resistor are connected with a corresponding sixth resistor R in parallel6After the switching process of the power device to be measured is finished, the sixth resistor R is used6For the first capacitor C1Discharging thereby eliminating gate charge QGInfluence of drift. A sixth resistor R6The resistance value of (a) should satisfy the following relation:
wherein, f is the switching frequency of the power device to be measured, and D is the switching duty ratio of the power device to be measured.
The peak detection circuit 203 may specifically include: first diode D1And a second capacitor C2；
Wherein the first diode D1Is connected to the output of the integrating circuit 202, a first diode D1Cathode and second capacitor C2Is connected with the input end of the linear isolating circuit, and a second capacitor C2The second terminal of (a) is grounded.
By using the one-way conduction characteristic of the diode, the first diode D1And a second capacitor C2Are connected in series so that the second capacitor C2Terminal voltage v ofPDApproximated as gate charge equivalent voltage vINTAs shown in equation (4). When the tested power device is aged, the gate leakage current of the device is gradually increased, vGQPeak voltage and secondTerminal voltage v of two capacitors CPDAnd correspondingly increases.
vPD＝vINT,P-vF (4)
Wherein v isINT,PIs v isINTVoltage peak value of vFIs a first diode D1The conduction voltage drop of (1).
Further, because the on-line monitoring device may adopt controllers such as a single chip, as shown in fig. 2, the health state on-line monitoring circuit of the power device provided in the embodiment of the present application may further include:
and a linear isolation circuit 204 arranged between the output end of the peak detection circuit 203 and the online monitoring equipment.
The output voltage of the peak detection circuit 203 is transmitted to an analog-to-digital conversion (ADC) port of the controller through the linear isolation circuit 204, and then the on-line evaluation of the health state of the power device under test is realized through the voltage value of the ADC port.
The linear isolation circuit 204 may be a linear optical coupling isolation circuit, a linear capacitive isolation circuit, or a linear magnetic isolation circuit.
In addition, as shown in fig. 3, the on-line health status monitoring circuit for a power device provided by the embodiment of the present application further includes a seventh resistor R connected in series between the output terminal of the integrating circuit 202 and the peak detecting circuit 2037。
On the basis that the above detailed description describes various embodiments corresponding to the online health state monitoring circuit of the power device, the present application also discloses an online health state monitoring system of the power device corresponding to the online health state monitoring circuit of the power device.
The online health state monitoring system for the power device provided in the embodiment of the present application may include the online health state monitoring circuit for the power device provided in any one of the embodiments, and further include:
and the controller is connected with the output end of the voltage signal acquisition circuit 200 and is used for evaluating the health state of the tested power device according to the change of the output voltage of the voltage signal acquisition circuit 200.
Further, the controller evaluates the health status of the power device under test according to the change of the output voltage of the voltage signal acquisition circuit 200, specifically:
when the output voltage of the voltage signal acquisition circuit 200 exceeds the first threshold value, it is determined that the power device under test is in an aging state.
Optionally, a plurality of first thresholds may be set, corresponding to different degrees of aging.
The present application provides a circuit and a system for online monitoring a health status of a power device. The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Claims (10)
1. An on-line health status monitoring circuit for a power device, comprising: a sampling resistor and a voltage signal acquisition circuit;
the sampling resistor is connected in series with a gate driving loop of the power device to be measured, the input end of the voltage signal acquisition circuit is connected in parallel with the two ends of the sampling resistor, and the output end of the voltage signal acquisition circuit is connected to the on-line monitoring equipment for the health state of the power device to be measured.
2. The on-line health status monitoring circuit for a power device according to claim 1, wherein the voltage signal acquisition circuit specifically comprises: the circuit comprises a differential amplifying circuit, an integrating circuit and a peak value detecting circuit;
the input end of the differential amplification circuit is connected in parallel with the two ends of the sampling circuit, the output end of the differential amplification circuit is connected with the input end of the integration circuit, the output end of the integration circuit is connected with the input end of the peak detection circuit, and the output end of the peak detection circuit is used for being connected with the online monitoring equipment.
3. The on-line health state monitoring circuit of a power device according to claim 2, wherein the differential amplifier circuit specifically comprises: the circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor and a first operational amplifier;
the first end of the first resistor is connected with the first end of the sampling resistor, the first end of the second resistor is connected with the second end of the sampling resistor, the second end of the first resistor, the first end of the third resistor and the negative input end of the first operational amplifier are connected, the second end of the third resistor, the output end of the first operational amplifier and the input end of the integrating circuit are connected, the second end of the second resistor, the first end of the fourth resistor and the positive input end of the first operational amplifier are connected, and the second end of the fourth resistor is grounded.
4. The on-line health status monitoring circuit for a power device according to claim 2, wherein the integrating circuit specifically comprises: a fifth resistor, a first capacitor and a second operational amplifier;
the first end of the fifth resistor is connected with the output end of the differential amplification circuit, the second end of the fifth resistor and the first end of the first capacitor are connected with the negative input end of the second operational amplifier, the positive input end of the second operational amplifier is grounded, and the second end of the first capacitor and the output end of the second operational amplifier are connected with the input end of the peak detection circuit.
5. The on-line health status monitoring circuit for a power device according to claim 4, further comprising: and the sixth resistor is connected in parallel with two ends of the first capacitor.
6. The on-line health status monitoring circuit for power device as claimed in claim 2, wherein the peak detection circuit comprises a first diode and a second capacitor;
the anode of the first diode and the first end of the second capacitor are connected with the input end of the linear isolation circuit, and the second end of the second capacitor is grounded.
7. The on-line health status monitoring circuit for a power device according to claim 2, further comprising:
and the linear isolation circuit is arranged between the output end of the peak detection circuit and the online monitoring equipment.
8. The on-line health status monitoring circuit for a power device according to claim 7, wherein the linear isolation circuit is a linear optical coupling isolation circuit, a linear capacitance isolation circuit, or a linear magnetic isolation circuit.
9. An online health state monitoring system for a power device, comprising the online health state monitoring circuit for a power device of any one of claims 1 to 8, and further comprising:
and the controller is connected with the output end of the voltage signal acquisition circuit and is used for evaluating the health state of the tested power device according to the change of the output voltage of the voltage signal acquisition circuit.
10. The system for online monitoring of the state of health of a power device according to claim 9, wherein the controller evaluates the state of health of the power device under test according to the change of the output voltage of the voltage signal acquisition circuit, specifically:
and when the output voltage of the voltage signal acquisition circuit exceeds a first threshold value, determining that the power device to be measured is in an aging state.
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