CN110794285A - Full-bridge switching circuit state detection circuit and method - Google Patents
Full-bridge switching circuit state detection circuit and method Download PDFInfo
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- CN110794285A CN110794285A CN201910994097.5A CN201910994097A CN110794285A CN 110794285 A CN110794285 A CN 110794285A CN 201910994097 A CN201910994097 A CN 201910994097A CN 110794285 A CN110794285 A CN 110794285A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R31/2832—Specific tests of electronic circuits not provided for elsewhere
Abstract
The invention discloses a full-bridge switch circuit state detection circuit and a method, wherein a state detection circuit comprising a current limiting unit, a voltage stabilizing unit, an energy storage unit and a detection unit is designed, the state detection of the full-bridge switch circuit can be realized only by taking the output of a load output end on a bridge arm of the full-bridge switch circuit as the input of the state detection circuit and detecting the voltage of the load output end through the state detection circuit.
Description
Technical Field
The invention belongs to the technical field of switch circuit state detection, and particularly relates to a full-bridge switch circuit state detection circuit and a full-bridge switch circuit state detection method.
Background
The full-bridge switch circuit includes one or more bridge arms, wherein each bridge arm generally includes an upper tube and a lower tube, a junction of the upper tube and the lower tube serves as a load output terminal, that is, the upper tube and the lower tube are connected to the load output terminal at the same time.
The IGBT and the MOSFET are commonly used power components, the switching frequency of the MOSFET is high, the voltage resistance is low, the switching frequency of the IGBT is low, the power is high, and the IGBT and the MOSFET are widely applied to the existing power electronic equipment. IGBTs are similar in principle to MOSFETs turning on and off, and when an IGBT or a MOSFET fails, an open circuit or a short circuit is a common type of failure. Therefore, before the operating system starts to operate, the operating state of the IGBT or the MOSFET is usually detected to confirm that the IGBT and the MOSFET are not disconnected or short-circuited, so as to avoid loss or accidents after operation.
When the IGBT is switched on and off, the voltage drop between the collector and the emitter of the IGBT is suddenly changed; when the MOSFET is turned on and off, a voltage drop between a source and a drain of the MOSFET changes abruptly, so in the prior art, a comparator is usually used to compare the on voltage drop and the off voltage drop to determine whether the IGBT and the MOSFET are damaged. In addition, it is also a hot spot of current research to judge whether the IGBT and the MOSFET are damaged by monitoring the changes of the temperature, gate voltage, operating load, magnetic field, etc. of the IGBT and the MOSFET. The problems of the method are as follows: the state detection circuit is added to each IGBT or MOSFET of all bridge arms in the full-bridge switch circuit, so that the state detection of the full-bridge switch circuit can be realized.
Disclosure of Invention
In view of the above, the present invention provides a full-bridge switch circuit state detection circuit and method, which can detect the state of the full-bridge switch circuit by detecting the voltage at the load output terminal of the full-bridge switch circuit through the proposed state detection circuit.
The invention provides a full-bridge switch circuit state detection circuit, which comprises an upper Insulated Gate Bipolar Transistor (IGBT) and a lower insulated gate bipolar transistor (MOSFET), or two MOSFETs, wherein the joint of one end of an upper tube and one end of a lower tube is a load output end and comprises a current limiting unit, a voltage stabilizing unit, an energy storage unit and a detection unit;
the current limiting unit is connected with the load output end and used for limiting the current of the output current of the full-bridge switching circuit and outputting the current after current limiting to the voltage stabilizing unit;
the voltage stabilizing unit is used for stabilizing the current output by the current limiting unit to form a stabilized voltage, the stabilized voltage is the voltage of the energy storage unit, and meanwhile, the stabilized voltage is a detection voltage;
the energy storage unit is used for charging and discharging according to the control of the detection unit;
the detection unit sends charging, maintaining and discharging signals to the energy storage unit through the first control end to control the energy storage unit to charge, maintain and discharge; the second control end is connected with the other end of the upper tube and controls the starting and the forbidding of the upper tube by sending starting and forbidding signals; and the third control end is connected with the other end of the lower tube and controls the starting and the inhibiting of the lower tube by sending starting and inhibiting signals.
Furthermore, the energy storage unit is a capacitor, and the output voltage of the capacitor is the detection voltage;
the detection unit sets the voltage of the first control end to be lower than the detection voltage, the capacitor discharges, when the detection unit judges that the discharge duration time reaches a set waiting time period, the first control end is set to be in a high-resistance state, and if the detection voltage is higher than a set charging voltage threshold value at the moment, the full-bridge switch circuit is prohibited from being started;
if the detection voltage is lower than or equal to a set charging voltage threshold value, setting the voltage of the first control end as a power supply voltage, charging the capacitor, when the detection voltage is equal to the power supply voltage, setting the first control end as a high impedance state, and after a set detection time period, when detecting that the falling amplitude of the current detection voltage reaches a set voltage falling threshold value, prohibiting the full-bridge switch circuit from being started by the detection unit;
when the falling amplitude of the detection voltage does not reach the set voltage falling threshold value, starting a lower tube in the full-bridge switch circuit through the third control end, and after waiting for the waiting time period, if the value of the detection voltage is higher than the set charging voltage threshold value, prohibiting the full-bridge switch circuit from being started;
if the value of the detection voltage is lower than or equal to the set charging voltage threshold value, starting an upper tube in the full-bridge switch circuit through the second control end, and after waiting for the waiting time period, if the value of the detection voltage at the moment is not equal to the rated voltage stabilization value of the voltage stabilization unit, prohibiting the full-bridge switch circuit from being started; otherwise, the full-bridge switching circuit is started.
Furthermore, the current limiting unit comprises a current limiting resistor, the voltage stabilizing unit comprises a voltage stabilizing tube, the voltage stabilizing tube is connected with the capacitor in parallel and then connected with one end of the current limiting resistor in series, and the other end of the current limiting resistor is connected with the load output end.
Further, the voltage stabilizing tube is connected in parallel with a capacitor and then connected in series with the current limiting resistor through a triode, wherein the voltage stabilizing tube is connected with a base electrode of the triode, the capacitor is connected with an emitting electrode of the triode, the current limiting resistor is connected with a collecting electrode of the triode, and the voltage of the emitting electrode is the detection voltage.
Further, the waiting time period is more than 5 times of the time constant of the capacitor, and the detection time period is more than 3 times of the time constant of the capacitor.
Further, the charging voltage threshold is a ground voltage, and the voltage drop threshold is less than or equal to 30% of the detection output voltage.
The invention provides a full-bridge switching circuit state detection method, which comprises the following steps:
step 1, a first control end of the detection unit outputs the discharge signal, the energy storage unit discharges, when the discharge duration reaches a set waiting time period, the first control end of the detection unit outputs the holding signal, when the detection voltage is higher than a set charging voltage threshold value, the second control end and the third control end prohibit the full-bridge switch circuit from being started, and the detection process is finished; when the detection voltage is lower than or equal to a set charging voltage threshold value, executing a step 2;
step 2, the first control end of the detection unit outputs the charging signal, the energy storage unit is charged, when the detection voltage is equal to the power voltage, the first control end outputs the holding signal, after a set detection time period, the value of the detection voltage is detected, if the detection voltage drop amplitude reaches a set voltage drop threshold value, the second and third control ends output a prohibition signal to prohibit the full-bridge switch circuit from being started, and the detection process is finished; otherwise, executing step 3;
step 3, the detection unit starts a lower tube in the full-bridge switch circuit through the third control end, detects the value of the detection voltage after waiting for a set waiting time period, and prohibits the full-bridge switch circuit from starting through the second and third control ends when the detection voltage is higher than a set charging voltage threshold value, so that the execution of the detection process is finished; otherwise, executing step 4;
step 4, the detection unit starts an upper tube in the full-bridge switch circuit through the second control end, detects the value of the detection voltage after waiting for a set waiting time period, and prohibits the full-bridge switch circuit from being started through the second and third control ends if the detection voltage is not equal to the rated voltage stabilization value of the voltage stabilization unit, so that the execution of the detection process is finished; otherwise, the full-bridge switch circuit is in a normal state, and the detection is finished.
The invention provides a full-bridge switching circuit state detection method, which comprises the following steps:
step 1, setting the voltage of a first control end of the detection unit as a grounding voltage, discharging the voltage, setting the first control end of the detection unit as a high-resistance state when the discharge duration reaches the waiting time period, detecting the value of the detection voltage, and forbidding a full-bridge switch circuit to start through the second and third control ends when the detection voltage is higher than the charging voltage threshold, so that the execution of the detection process is finished; when the detection voltage is lower than or equal to the charging voltage threshold value, executing the step 2;
step 2, setting the voltage of the first control end of the detection unit as a power supply voltage, charging the capacitor, when the detection voltage is equal to the power supply voltage, setting the first control end to be in a high impedance state, waiting for the detection time period, detecting the value of the detection voltage, and if the detection voltage drop amplitude reaches the voltage drop threshold value, prohibiting the full-bridge switch circuit from starting through the second and third control ends, and finishing the execution of the detection process; otherwise, executing step 3;
step 3, the detection unit starts a lower tube in the full-bridge switch circuit through the third control end, detects the value of the detection voltage after waiting for the waiting time period, and prohibits the full-bridge switch circuit from being started through the second and third control ends when the detection voltage is higher than the charging voltage threshold value, so that the detection process is finished; otherwise, executing step 4;
step 4, the detection unit starts an upper tube in the full-bridge switch circuit through the second control end, detects the value of the detection voltage after waiting for the waiting time period, and prohibits the full-bridge switch circuit from being started through the second and third control ends if the detection voltage is not equal to the rated voltage stabilization value of the voltage stabilization unit, so that the execution of the detection process is finished; otherwise, the full-bridge switch circuit is in a normal state, and the detection is finished.
Has the advantages that:
the invention designs the state detection circuit comprising the current limiting unit, the voltage stabilizing unit, the energy storage unit and the detection unit, only the output of the load output end on the bridge arm of the full-bridge switch circuit is required to be used as the input of the state detection circuit, and the state detection of the voltage of the load output end can be realized through the state detection circuit.
Drawings
Fig. 1 is a block diagram of a state detection circuit of a full bridge switch circuit in the prior art.
Fig. 2 is a structural diagram of a full-bridge switching circuit state detection circuit provided by the invention.
Fig. 3 is a typical structure diagram of a full-bridge switching circuit state detection circuit provided by the present invention.
Fig. 4 is an improved structure diagram of a full-bridge switching circuit state detection circuit provided by the present invention.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
Generally, when an IGBT is turned on, the on-current is increased, and the on-voltage drop of the IGBT is increased, so that, as shown in fig. 1, a general switch protection circuit in the prior art mainly determines whether the IGBT is over-current by detecting the voltage between CEs when the IGBT is turned on, in which case, a detection chip needs to be added to each IGBT in the circuit.
The invention provides a full-bridge switch circuit state detection circuit, as shown in a dotted line frame in figure 2, which comprises a current limiting unit, a voltage stabilizing unit, an energy storage unit and a detection unit, wherein the current limiting unit is connected with the output end of a full-bridge switch circuit, the current limiting unit, the voltage stabilizing unit and the energy storage unit are connected in series, the voltage at the connection part of the voltage stabilizing unit and the energy storage unit is used as the input voltage of the detection unit, namely the detection voltage, the current limiting unit is connected with the load output end of the full-bridge switch circuit, the state detection of the full-bridge switch circuit can be realized by detecting the voltage of the load output end, and the connection part of one end of an upper pipe and one end of a lower pipe is used.
The specific description of each unit is as follows:
the current limiting unit is used for limiting the current of the output current of the full-bridge switching circuit and outputting the current after current limiting to the voltage stabilizing unit;
the voltage stabilizing unit is used for stabilizing the current output by the current limiting unit to form a stabilized voltage, and then outputting the stabilized voltage to the energy storage unit and the detection unit, wherein the stabilized voltage is a detection voltage;
the detection unit sends charging, maintaining and discharging signals to the energy storage unit through the first control end to control the energy storage unit to charge, maintain and discharge; the second control end is connected with the other end of the upper tube and controls the starting and the forbidding of the upper tube by sending starting and forbidding signals; the third control end is connected with the other end of the lower pipe and controls the starting and the prohibition of the lower pipe by sending starting and prohibiting signals;
and the energy storage unit is used for charging and discharging according to the control of the detection unit.
The circuit structure of the full-bridge switch circuit state detection circuit provided by the invention is shown in fig. 3, wherein a current limiting unit is composed of a current limiting resistor R1, a voltage stabilizing unit is composed of a voltage stabilizing tube D1, an energy storage unit is composed of a capacitor C1, and a detection unit is a common control chip, such as a DSP, an ARM or a singlechip. The specific circuit connection is that a voltage regulator tube D1 is connected with a capacitor C1 in parallel and then connected with a current limiting resistor R1 in series, and the serial point is connected with the detection unit.
When the voltage of the detection unit is set to be lower than the detection voltage, for example, the voltage of the detection unit is set to be the ground voltage, the energy storage unit discharges, when the discharge duration time reaches a set waiting time period, the waiting time period is usually greater than 5 times of the time constant of an energy storage element in the energy storage unit, the detection unit is switched to a high-impedance state, and at the moment, the value of the detection output voltage is recorded as a discharge measured value; when the voltage of the detection unit is higher than the detection output voltage, the energy storage unit is charged, when the voltage of the energy storage unit reaches the current voltage of the detection unit, the detection unit is converted into a high-resistance state, and the value of the detection output voltage is recorded as a charging measured value;
the detection unit controls the charging and discharging of the energy storage unit by setting the state of the control pin of the detection unit, and detects the state of the full-bridge switching circuit according to the value of the detection voltage.
When the detection unit sets the control pin to be grounding voltage, the energy storage unit discharges, when the detection unit judges that the discharge duration time reaches a set waiting time period, the control pin is set to be in a high-resistance state, if the detection voltage is higher than a set charging voltage threshold value at the moment, the upper tube in the full-bridge switch circuit is in a short-circuit state, and the full-bridge switch circuit is forbidden to be started;
if the detection voltage is the grounding voltage or 0v at the moment, the upper tube in the full-bridge switch circuit is not in a short-circuit state, the detection unit sets the control pin of the upper tube to be a power supply voltage which is higher than the current detection voltage value, when the energy storage unit is charged to the state that the current detection voltage is equal to the power supply voltage, the detection unit sets the control pin of the upper tube to be a high-resistance state, after the set detection time period is waited, if the detection voltage drop amplitude reaches the set voltage drop threshold value at the moment, for example, 30% or more of the original charge measurement value is dropped, the lower tube in the full-bridge switch circuit is short-circuited, and the full-bridge switch circuit is forbidden to be; otherwise, the lower tube in the full-bridge switch circuit is started if the lower tube in the full-bridge switch circuit is not short-circuited, and after the waiting time period, if the value of the detection voltage is not the grounding voltage or 0v, the lower tube in the full-bridge switch circuit is in an open circuit state, the full-bridge switch circuit is prohibited from being started; if the value of the detection voltage is the grounding voltage or 0v, which indicates that the lower tube in the full-bridge switch circuit is normally conducted, starting the upper tube in the full-bridge switch circuit, and after a waiting time period, if the value of the detection voltage is not equal to the rated voltage stabilizing value of the voltage stabilizing unit, which indicates that the upper tube in the full-bridge switch circuit is in an open circuit state, prohibiting the full-bridge switch circuit from being started; otherwise, the upper tube in the full-bridge switch circuit is conducted normally, and the detection is finished.
On the basis of fig. 3, the invention provides an improved circuit structure of a full-bridge switch circuit state detection circuit, as shown in fig. 4, wherein a current limiting unit is formed by a current limiting resistor R2, a voltage stabilizing unit is formed by connecting a voltage stabilizing tube D1 and a voltage stabilizing resistor R1 in series, an energy storage unit is formed by a capacitor C1, and the detection unit is a common control chip. The specific circuit connection is that a current-limiting resistor R2, a voltage regulator tube D1 and a capacitor C1 are connected through a triode Q1, wherein the current-limiting resistor R2 is connected with a collector of a triode Q1, the voltage regulator tube D1 is connected with a base of the triode Q1, the capacitor C1 is connected with an emitter of a triode Q1, and a detection unit is connected between the capacitor C1 and the emitter.
The invention provides a full-bridge switch circuit state detection circuit, and a full-bridge switch circuit state detection method, which specifically comprises the following steps:
step 1, a first control end of a detection unit outputs a discharge signal, an energy storage unit discharges, when the discharge duration time reaches a set waiting time period, the first control end of the detection unit outputs a holding signal, when the detection voltage is higher than a set charging voltage threshold value, a prohibition signal is output through a second control end and a third control end, a full-bridge switching circuit is prohibited from starting, and the execution of a detection process is finished; when the detection voltage is lower than or equal to the set charging voltage threshold value, executing the step 2;
step 2, a first control end of the detection unit outputs a charging signal, the energy storage unit is charged, when the detection voltage is equal to the power voltage, the first control end outputs a holding signal, the value of the detection voltage is detected after a set detection time period is waited, if the reduction amplitude of the detection voltage reaches a set voltage reduction threshold value, inhibition signals are output through a second control end and a third control end, the full-bridge switch circuit is inhibited from being started, and the execution of the detection process is finished; otherwise, executing step 3;
step 3, the detection unit outputs a starting signal through the third control end, a lower tube in the full-bridge switch circuit is started, the value of the detection voltage is detected after a set waiting time period is waited, when the detection voltage is higher than a set charging voltage threshold value, inhibition signals are output through the second control end and the third control end, the full-bridge switch circuit is inhibited from being started, and the execution of the detection process is finished; otherwise, executing step 4;
step 4, the detection unit outputs a starting signal through the second control end, starts an upper tube in the full-bridge switch circuit, detects the value of the detection voltage after waiting for a set waiting time period, and prohibits the full-bridge switch circuit from starting through the second and third control ends if the detection voltage is not equal to the rated voltage stabilization value of the voltage stabilization unit, so that the execution of the detection process is finished; otherwise, the full-bridge switch circuit is in a normal state, and the detection is finished.
For the circuits shown in fig. 3 and 4, the discharge signal is to set the voltage of the first control terminal to the ground voltage, the charge signal is to set the voltage of the first control terminal to the power voltage, and the hold signal is to set the first control terminal to the high impedance state.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A full-bridge switch circuit state detection circuit comprises an upper insulated gate bipolar transistor and a lower insulated gate bipolar transistor or two metal oxide semiconductor field effect transistors, wherein the joint of one end of an upper tube and one end of a lower tube is a load output end;
the current limiting unit is connected with the load output end and used for limiting the current of the output current of the full-bridge switching circuit and outputting the current after current limiting to the voltage stabilizing unit;
the voltage stabilizing unit is used for stabilizing the current output by the current limiting unit to form a stabilized voltage, the stabilized voltage is the voltage of the energy storage unit, and meanwhile, the stabilized voltage is a detection voltage;
the energy storage unit is used for charging and discharging according to the control of the detection unit;
the detection unit sends charging, maintaining and discharging signals to the energy storage unit through the first control end to control the energy storage unit to charge, maintain and discharge; the second control end is connected with the other end of the upper tube and controls the starting and the forbidding of the upper tube by sending starting and forbidding signals; and the third control end is connected with the other end of the lower tube and controls the starting and the inhibiting of the lower tube by sending starting and inhibiting signals.
2. The detection circuit according to claim 1, wherein the energy storage unit is a capacitor, and an output voltage of the capacitor is the detection voltage;
the detection unit sets the voltage of the first control end to be lower than the detection voltage, the capacitor discharges, when the detection unit judges that the discharge duration time reaches a set waiting time period, the first control end is set to be in a high-resistance state, and if the detection voltage is higher than a set charging voltage threshold value at the moment, the full-bridge switch circuit is prohibited from being started;
if the detection voltage is lower than or equal to a set charging voltage threshold value, setting the voltage of the first control end as a power supply voltage, charging the capacitor, when the detection voltage is equal to the power supply voltage, setting the first control end as a high impedance state, and after a set detection time period, when detecting that the falling amplitude of the current detection voltage reaches a set voltage falling threshold value, prohibiting the full-bridge switch circuit from being started by the detection unit;
when the falling amplitude of the detection voltage does not reach the set voltage falling threshold value, starting a lower tube in the full-bridge switch circuit through the third control end, and after waiting for the waiting time period, if the value of the detection voltage is higher than the set charging voltage threshold value, prohibiting the full-bridge switch circuit from being started;
if the value of the detection voltage is lower than or equal to the set charging voltage threshold value, starting an upper tube in the full-bridge switch circuit through the second control end, and after waiting for the waiting time period, if the value of the detection voltage at the moment is not equal to the rated voltage stabilization value of the voltage stabilization unit, prohibiting the full-bridge switch circuit from being started; otherwise, the full-bridge switching circuit is started.
3. The detection circuit according to claim 2, wherein the current limiting unit comprises a current limiting resistor, the voltage stabilizing unit comprises a voltage regulator tube, the voltage regulator tube is connected with the capacitor in parallel and then connected with one end of the current limiting resistor in series, and the other end of the current limiting resistor is connected with the load output end.
4. The detection circuit according to claim 3, wherein the voltage regulator tube is connected in parallel with a capacitor and then connected in series with the current limiting resistor by using a triode, wherein the voltage regulator tube is connected with a base electrode of the triode, the capacitor is connected with an emitting electrode of the triode, the current limiting resistor is connected with a collector electrode of the triode, and the voltage of the emitting electrode is the detection voltage.
5. The detection circuit according to claim 3, wherein the waiting time period is 5 times or more a time constant of the capacitor, and the detection time period is 3 times or more a time constant of the capacitor.
6. The detection circuit of claim 1, wherein the charging voltage threshold is a ground voltage and the voltage drop threshold is less than or equal to 30% of the detection output voltage.
7. A method for detecting the state of a full-bridge switch circuit using the detection circuit of claim 1, comprising the steps of:
step 1, a first control end of the detection unit outputs the discharge signal, the energy storage unit discharges, when the discharge duration reaches a set waiting time period, the first control end of the detection unit outputs the holding signal, when the detection voltage is higher than a set charging voltage threshold value, the second control end and the third control end prohibit the full-bridge switch circuit from being started, and the detection process is finished; when the detection voltage is lower than or equal to a set charging voltage threshold value, executing a step 2;
step 2, the first control end of the detection unit outputs the charging signal, the energy storage unit is charged, when the detection voltage is equal to the power voltage, the first control end outputs the holding signal, after a set detection time period, the value of the detection voltage is detected, if the detection voltage drop amplitude reaches a set voltage drop threshold value, the second and third control ends output a prohibition signal to prohibit the full-bridge switch circuit from being started, and the detection process is finished; otherwise, executing step 3;
step 3, the detection unit starts a lower tube in the full-bridge switch circuit through the third control end, detects the value of the detection voltage after waiting for a set waiting time period, and prohibits the full-bridge switch circuit from starting through the second and third control ends when the detection voltage is higher than a set charging voltage threshold value, so that the execution of the detection process is finished; otherwise, executing step 4;
step 4, the detection unit starts an upper tube in the full-bridge switch circuit through the second control end, detects the value of the detection voltage after waiting for a set waiting time period, and prohibits the full-bridge switch circuit from being started through the second and third control ends if the detection voltage is not equal to the rated voltage stabilization value of the voltage stabilization unit, so that the execution of the detection process is finished; otherwise, the full-bridge switch circuit is in a normal state, and the detection is finished.
8. A full-bridge switch circuit state detection method adopting the detection circuit of any one of claims 2-6, characterized by comprising the following steps:
step 1, setting the voltage of a first control end of the detection unit as a grounding voltage, discharging the voltage, setting the first control end of the detection unit as a high-resistance state when the discharge duration reaches the waiting time period, detecting the value of the detection voltage, and forbidding a full-bridge switch circuit to start through the second and third control ends when the detection voltage is higher than the charging voltage threshold, so that the execution of the detection process is finished; when the detection voltage is lower than or equal to the charging voltage threshold value, executing the step 2;
step 2, setting the voltage of the first control end of the detection unit as a power supply voltage, charging the capacitor, when the detection voltage is equal to the power supply voltage, setting the first control end to be in a high impedance state, waiting for the detection time period, detecting the value of the detection voltage, and if the detection voltage drop amplitude reaches the voltage drop threshold value, prohibiting the full-bridge switch circuit from starting through the second and third control ends, and finishing the execution of the detection process; otherwise, executing step 3;
step 3, the detection unit starts a lower tube in the full-bridge switch circuit through the third control end, detects the value of the detection voltage after waiting for the waiting time period, and prohibits the full-bridge switch circuit from being started through the second and third control ends when the detection voltage is higher than the charging voltage threshold value, so that the detection process is finished; otherwise, executing step 4;
step 4, the detection unit starts an upper tube in the full-bridge switch circuit through the second control end, detects the value of the detection voltage after waiting for the waiting time period, and prohibits the full-bridge switch circuit from being started through the second and third control ends if the detection voltage is not equal to the rated voltage stabilization value of the voltage stabilization unit, so that the execution of the detection process is finished; otherwise, the full-bridge switch circuit is in a normal state, and the detection is finished.
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| CN112857406A (en) * | 2021-01-08 | 2021-05-28 | 重庆开谨科技有限公司 | High-voltage excited Wheatstone bridge measuring method |
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