CN111391611A - Operation detection method, operation detection device, vehicle-mounted air conditioner and storage medium - Google Patents

Operation detection method, operation detection device, vehicle-mounted air conditioner and storage medium Download PDF

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Publication number
CN111391611A
CN111391611A CN202010219617.8A CN202010219617A CN111391611A CN 111391611 A CN111391611 A CN 111391611A CN 202010219617 A CN202010219617 A CN 202010219617A CN 111391611 A CN111391611 A CN 111391611A
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China
Prior art keywords
circuit
comparator
voltage
signal
protection
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CN202010219617.8A
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Chinese (zh)
Inventor
霍兆镜
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Guangzhou Hualing Refrigeration Equipment Co Ltd
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Guangzhou Hualing Refrigeration Equipment Co Ltd
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Priority to CN202010219617.8A priority Critical patent/CN111391611A/en
Publication of CN111391611A publication Critical patent/CN111391611A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60HARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00Heating, cooling or ventilating [HVAC] devices
    • B60H1/00507Details, e.g. mounting arrangements, desaeration devices
    • B60H1/00585Means for monitoring, testing or servicing the air-conditioning

Abstract

The invention provides an operation detection method, an operation detection device, a vehicle-mounted air conditioner and a storage medium, wherein the operation detection method comprises the following steps: responding to a protection signal output by the protection circuit, and outputting a pulse detection signal to a power switch tube of the voltage-multiplying booster circuit; collecting a sampling signal of a voltage-multiplying booster circuit generated according to a pulse detection signal; and detecting the sampling signal abnormality, determining that a boosting inductor in the voltage-multiplying boosting circuit is short-circuited, and executing short-circuit protection. Through the technical scheme of the invention, on one hand, the probability of overcurrent fault and damage of the switching tube can be reduced, and on the other hand, the short-circuit fault of the boost inductor can be quickly positioned, so that the fault removal efficiency is favorably improved.

Description

Operation detection method, operation detection device, vehicle-mounted air conditioner and storage medium
Technical Field
The present invention relates to the field of drive control, and in particular, to an operation detection method, an operation detection device, a vehicle-mounted air conditioner, and a computer-readable storage medium.
Background
In the related art, when a boost inductor of a boost circuit is short-circuited, the circuit fault can be only roughly displayed and cannot be specifically positioned on the boost inductor, so that no inductor short-circuit protection measure is provided, and the probability that an overcurrent fault occurs and a switch tube is damaged is high.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
To this end, it is an object of the invention to propose an operation detection method.
Another object of the present invention is to provide an operation detection device.
It is still another object of the present invention to provide a vehicle air conditioner.
It is yet another object of the present invention to provide a computer-readable storage medium.
The technical scheme of the first aspect of the invention provides an operation detection method, which comprises the following steps: responding to a protection signal output by the protection circuit, and outputting a pulse detection signal to a power switch tube of the voltage-multiplying booster circuit; collecting a sampling signal of a voltage-multiplying booster circuit generated according to a pulse detection signal; and detecting the sampling signal abnormality, determining that a boosting inductor in the voltage-multiplying boosting circuit is short-circuited, and executing short-circuit protection.
The operation detection method is suitable for a drive control circuit, and the drive control circuit comprises a voltage-multiplying booster circuit and a protection circuit which are electrically connected.
In the technical scheme, if the protection circuit outputs a protection signal, it is indicated that the drive control circuit enters a protection state due to abnormality, under the protection state, the power switch tube can be configured to be in an off state, a pulse detection signal is output to the power switch tube of the voltage-doubling booster circuit, the power switch tube is tried to be turned on again, if the sampling signal is abnormal, it is indicated that the abnormality is caused by the short circuit of the boost inductor, and the power switch tube is rapidly turned off by performing short-circuit protection again.
In the above technical solution, the protection circuit includes a first comparator and a second comparator, the voltage-doubling boost circuit is adapted to output a sampling current, the first comparator is adapted to compare the sampling current with a current threshold, if a difference between the sampling current and the current threshold is greater than the comparison threshold, the first comparator outputs a trigger signal to the second comparator, and the trigger signal is adapted to trigger the second comparator to output a protection signal.
Wherein the first comparator and the second comparator may be integrated in one chip.
In the technical scheme, the first comparator obtains current information from the sampling resistor and compares the current information, when the current value is larger than a set value, the trigger signal is output to the second comparator, so that the second comparator is triggered to output a protection signal, the protection circuit enters a protection state according to the protection signal and is self-locked, and the switch tube is prevented from being damaged by repeated switching.
When the second comparator enters a protection state, the control signals PFC-in-A and PFC-in-B of the switch tube are pulled down, and the switch tube is prevented from being turned on again by the control signals.
When the second comparator enters a protection state, a control signal PFC-PF is output to the controller, and the controller is informed of overcurrent protection.
In any one of the above technical solutions, the driving control circuit further includes an amplifying circuit, the amplifying circuit is adapted to be connected to the voltage-doubling boost circuit and the protection circuit, the protection circuit includes a first comparator and a second comparator, the amplifying circuit includes a third comparator, the third comparator is adapted to perform an amplifying operation on the sampling current output by the voltage-doubling boost circuit and mark the amplified sampling current as an amplifying current, the first comparator is adapted to compare the amplifying current with a current threshold, if the amplifying current is greater than the current threshold, the first comparator outputs a trigger signal to the second comparator, and the trigger signal is adapted to trigger the second comparator to output a protection signal.
In the technical scheme, a third comparator in the amplifying circuit acquires current information from a sampling resistor and then amplifies the current information to be input into a first comparator of the comparator, when the current is too large through the sampling resistor, the second comparator is triggered to output a protection signal, and the protection circuit enters a protection state and is self-locked after protection, so that the switch tube is prevented from being damaged by repeated switching.
When the second comparator enters a protection state, the control signals PFC-in-A and PFC-in-B of the switch tube are pulled down, and the switch tube is prevented from being turned on again by the control signals.
When the second comparator enters a protection state, a control signal PFC-PF is output to the controller, and the controller is informed of overcurrent protection.
In any one of the above technical solutions, the output end of the first comparator is adapted to be connected to the first input end of the second comparator, if the second comparator is triggered, the voltage of the first input end is pulled down to 0V, the voltage of the second input end of the second comparator is greater than the voltage of the first input end, the second comparator outputs a low level, and the low level is adapted to pull down the driving signal of the power switching tube to turn off the power switching tube.
In any one of the above technical solutions, a charging resistor is disposed between an output terminal of the first comparator and the designated power supply, a capacitive element is disposed between a first input terminal of the second comparator and an output terminal of the second comparator, and if a voltage of the second input terminal is greater than a voltage of the first input terminal, the output terminal of the second comparator recovers to a high level, wherein a charging duration of the capacitive element is determined according to the charging resistor and an RC constant of the capacitive element.
In the technical scheme, the first comparator protection signal is output to the second comparator after being triggered. The pin 3 of the second comparator is pulled down to 0V, and the voltage of the pin 2 of the second comparator is higher than that of the pin 3 of the second comparator, so that the comparator outputs low level to pull down the PFC-in-A and the PFC-in-B and outputs a control signal PFC-PF to the controller. Because the control signal is pulled down, the switching tube is immediately turned off, the input signal of the first comparator is recovered to be normal after the switching tube is turned off, and the output of the first comparator is also recovered to be normal. Since the output of the comparator is an open-drain output (i.e., no voltage is output, the pin is grounded when the pin outputs a low level, and the pin outputs neither a high level nor a low level when the pin outputs a high level, which is in a high impedance state), the pin 7 of the first comparator is in a high impedance state at this time. The pin 3 of the second comparator charges the capacitor through the resistor R627, and when the charging voltage is higher than the voltage of the pin 2, the output of the second comparator of the comparator restores to a high level, and the charging time t can be calculated through the charging resistor and the RC constant of the capacitive element. And after the output of the second comparator restores to the high level, the capacitor is discharged to prepare for next protection self-locking.
In any one of the above technical solutions, outputting a pulse detection signal to a power switching tube of the voltage-doubling boost circuit in response to a protection signal output by the protection circuit specifically includes: responding to a protection signal output by the protection circuit, and determining that the boosting voltage-multiplying circuit has a short-circuit fault; the boosting voltage-multiplying circuit stops running and detects whether the short-circuit fault disappears; and if the short-circuit fault disappears, outputting a pulse detection signal to the power switch tube, wherein the pulse detection signal is suitable for conducting the power switch tube.
In the technical scheme, the operation is stopped if a short-circuit fault occurs in the operation process, and the operation is also stopped if the short-circuit fault occurs in the starting process. And then enters a failure determination mode. And if the fault signal input still exists, judging that the fault circuit has a fault. If no fault signal is input at the moment, a control pulse is output to control the switching tube to try to open, and if the fault signal has feedback at once, the fault is caused by the short circuit of the inductor.
In any one of the above technical solutions, the method further includes: and if the short-circuit fault still exists, judging that the protection circuit has a fault, and generating a fault prompt signal.
In any one of the above technical solutions, the method further includes: and in the running process of the drive control circuit or the starting running of the drive control circuit, triggering and detecting whether a short-circuit fault occurs.
In any one of the above technical solutions, detecting that the sampling signal is abnormal further includes: an inductive short fault signal is generated.
The technical solution of the second aspect of the present invention provides an operation detection device, which is suitable for a driving control circuit, the driving control circuit includes a voltage-doubling boost circuit and a protection circuit, which are electrically connected, and the operation detection device includes: a memory and a processor; a memory for storing program code; a processor, configured to invoke a program code to perform the steps of the operation detection method according to any one of the above-mentioned technical solutions of the first aspect.
A third aspect of the present invention provides a vehicle-mounted air conditioner, including: a load; the driving control circuit is suitable for driving the load to run and comprises a voltage-multiplying booster circuit and a protection circuit which are electrically connected; the operation detection device as defined in the above technical solution, the operation detection device being adapted to perform the steps of: responding to a protection signal output by the protection circuit, and outputting a pulse detection signal to a power switch tube of the voltage-multiplying booster circuit; collecting a sampling signal of a voltage-multiplying booster circuit generated according to a pulse detection signal; and detecting the sampling signal abnormality, determining that a boosting inductor in the voltage-multiplying boosting circuit is short-circuited, and executing short-circuit protection.
In the above technical solution, the load includes a compressor and/or a fan.
According to an aspect of the fourth aspect of the present invention, there is also provided a computer-readable storage medium, on which a computer program is stored, the computer program, when executed, implementing the steps of the operation detection method defined in the above-mentioned aspect.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 shows a schematic flow diagram of a run detection method according to one embodiment of the invention;
FIG. 2 shows a schematic diagram of a drive control circuit according to an embodiment of the invention;
FIG. 3 shows a schematic diagram of a drive control circuit according to another embodiment of the invention;
fig. 4 shows a schematic diagram of a chip structure integrated with the first comparator and the second comparator in fig. 2 and 3.
FIG. 5 shows a schematic flow diagram of a run detection method according to another embodiment of the invention;
fig. 6 shows a schematic block diagram of an operation detection apparatus according to an embodiment of the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.
As shown in fig. 1, the operation detection method according to the embodiment of the present invention includes:
and step S102, responding to the protection signal output by the protection circuit, and outputting a pulse detection signal to a power switch tube of the voltage-doubling booster circuit.
And step S104, collecting a sampling signal of the voltage-multiplying booster circuit generated according to the pulse detection signal.
And S106, detecting that the sampling signal is abnormal, determining that a boosting inductor in the voltage-multiplying boosting circuit is short-circuited, and executing short-circuit protection.
The operation detection method is suitable for a drive control circuit, and the drive control circuit comprises a voltage-multiplying booster circuit and a protection circuit which are electrically connected.
In this embodiment, if the protection circuit outputs a protection signal, it indicates that the driving control circuit enters a protection state due to an abnormality, and in this protection state, the power switching tube may be configured to be in an off state, and a pulse detection signal is output to the power switching tube of the voltage-doubling boost circuit, and an attempt is made to turn on the power switching tube again, and if the sampling signal is abnormal, it indicates that the abnormality is caused by a boost inductance short circuit, and the power switching tube is quickly turned off by performing short-circuit protection again.
As shown in fig. 2, in the above embodiment, the protection circuit includes a first comparator and a second comparator, the voltage-doubling boost circuit is adapted to output the sampling current, the first comparator is adapted to compare the sampling current with a current threshold, if a difference between the sampling current and the current threshold is greater than the comparison threshold, the first comparator outputs a trigger signal to the second comparator, and the trigger signal is adapted to trigger the second comparator to output the protection signal.
As shown in fig. 4, a first comparator and a second comparator may be integrated into one chip IC602, wherein the first comparator is connected to pins 5 to 7, and the second comparator is connected to pins 1 to 3.
In the embodiment, the first comparator acquires current information from the sampling resistor and compares the current information, when the current value is larger than a set value, the trigger signal is output to the second comparator, so that the second comparator is triggered to output a protection signal, the protection circuit enters a protection state according to the protection signal and is self-locked, and the switch tube is prevented from being damaged by repeated switching.
When the second comparator enters a protection state, the control signals PFC-in-A and PFC-in-B of the switch tube are pulled down, and the switch tube is prevented from being turned on again by the control signals.
When the second comparator enters a protection state, a control signal PFC-PF is output to the controller, and the controller is informed of overcurrent protection.
As shown in fig. 3, in any of the above embodiments, the driving control circuit further includes an amplifying circuit, the amplifying circuit is adapted to be connected to the voltage-doubling boosting circuit and the protection circuit, respectively, the protection circuit includes a first comparator and a second comparator, the amplifying circuit includes a third comparator, the third comparator is adapted to perform an amplifying operation on the sampling current output by the voltage-doubling boosting circuit and mark the amplified sampling current as the amplifying current, the first comparator is adapted to compare the amplifying current with a current threshold, if the amplifying current is greater than the current threshold, the first comparator outputs a trigger signal to the second comparator, and the trigger signal is adapted to trigger the second comparator to output a protection signal.
In the embodiment, the third comparator in the amplifying circuit acquires current information from the sampling resistor and then amplifies the current information to be input into the first comparator of the comparator, when the current is overlarge through the sampling resistor, the second comparator is triggered to output a protection signal, and after protection, the protection state is started and self-locking is carried out, so that the switch tube is prevented from being damaged by repeated switching.
Wherein the third comparator is integrated in the IC603 as shown in fig. 3.
When the second comparator enters a protection state, the control signals PFC-in-A and PFC-in-B of the switch tube are pulled down, and the switch tube is prevented from being turned on again by the control signals.
When the second comparator enters a protection state, a control signal PFC-PF is output to the controller, and the controller is informed of overcurrent protection.
In any of the above embodiments, the output terminal of the first comparator is adapted to be connected to the first input terminal of the second comparator, if the second comparator is triggered, the voltage of the first input terminal is pulled down to 0V, the voltage of the second input terminal of the second comparator is greater than the voltage of the first input terminal, and the second comparator outputs a low level, where the low level is adapted to pull down the driving signal of the power switch tube to turn off the power switch tube.
In any of the above embodiments, a charging resistor is disposed between the output terminal of the first comparator and the designated power supply, a capacitive element is disposed between the first input terminal of the second comparator and the output terminal of the second comparator, and if the voltage of the second input terminal is greater than the voltage of the first input terminal, the output terminal of the second comparator returns to a high level, wherein the charging duration of the capacitive element is determined according to the charging resistor and an RC constant of the capacitive element.
In this embodiment, the first comparator protection signal is triggered and then output to the second comparator. The second comparator pin 3 is pulled down to 0V, and the voltage of the second comparator pin 2 is higher than that of the second comparator pin 3, so that the comparator outputs low level to pull down the PFC-in-a and PFC-in-B and outputs a control signal PFC-PF to the controller. Because the control signal is pulled down, the switch tube is immediately turned off, the input signal of the first comparator is recovered to be normal after the switch tube is turned off, and the output of the IC602-2 is also recovered to be normal. Since the output of the comparator is an open-drain output (i.e., no voltage is output, the pin is grounded when the control outputs a low level, and the pin outputs neither a high level nor a low level when the control outputs a high level, which is in a high impedance state), the pin 7 of the IC602 is in a high impedance state at this time. Pin 3 of IC602 charges capacitor C617 through resistor R627, and when the charging voltage is higher than the voltage at pin 2 (the voltage is divided by R630 and R200), the output of the second comparator of the comparator returns to high level, and the charging time t can be calculated by the RC constants of resistor R627 and capacitor C617. After the output of the second comparator returns to high level, the capacitor C617 discharges through D605 in preparation for the next protection self-lock.
In any of the above embodiments, outputting a pulse detection signal to the power switch tube of the voltage-doubling boost circuit in response to the protection signal output by the protection circuit specifically includes: and determining that the boosting voltage-multiplying circuit has short-circuit fault in response to the protection signal output by the protection circuit.
In this embodiment, the operation is stopped if a short-circuit fault occurs during the operation, and the operation is also stopped if a short-circuit fault occurs during the start-up. And then enters a failure determination mode. And if the fault signal input still exists, judging that the fault circuit has a fault. If no fault signal is input at the moment, a control pulse is output to control the switching tube to try to open, and if the fault signal has feedback at once, the fault is caused by the short circuit of the inductor.
In any of the above embodiments, further comprising: and if the short-circuit fault still exists, judging that the protection circuit has a fault, and generating a fault prompt signal.
As shown in fig. 5, the operation detection method according to the embodiment of the present invention includes:
step S502, in the process of operating the drive control circuit or when the drive control circuit starts to operate, whether a short-circuit fault occurs is triggered and detected.
In step S504, if a short-circuit fault occurs, the protection circuit outputs a protection signal.
And step S506, responding to the protection signal, stopping the operation of the boost voltage-doubling circuit, and detecting whether the short-circuit fault disappears.
And step S508, if the short-circuit fault disappears, outputting a pulse detection signal to the power switch tube, wherein the pulse detection signal is suitable for conducting the power switch tube.
Step S510, collecting a sampling signal of the voltage-doubling boost circuit generated according to the pulse detection signal.
And S512, detecting that the sampling signal is abnormal, determining that a boosting inductor in the voltage-multiplying boosting circuit is short-circuited, executing short-circuit protection, and generating an inductor short-circuit fault signal.
As shown in fig. 6, the operation detection device 60 according to the embodiment of the present invention is applied to a drive control circuit including a voltage-multiplying voltage boosting circuit and a protection circuit electrically connected to each other, and includes: a memory 602 and a processor 604; a memory 602 for storing program code; a processor 604 for invoking program code to perform the steps of the operation detection method as described in any one of the embodiments of the first aspect above.
An in-vehicle air conditioner according to an embodiment of the present invention includes: a load; the driving control circuit is suitable for driving the load to run and comprises a voltage-multiplying booster circuit and a protection circuit which are electrically connected; the operation detection device as defined in the above embodiment, the operation detection device being adapted to perform the steps of: responding to a protection signal output by the protection circuit, and outputting a pulse detection signal to a power switch tube of the voltage-multiplying booster circuit; collecting a sampling signal of a voltage-multiplying booster circuit generated according to a pulse detection signal; and detecting the sampling signal abnormality, determining that a boosting inductor in the voltage-multiplying boosting circuit is short-circuited, and executing short-circuit protection.
In the above embodiments, the load comprises a compressor and/or a fan.
A computer-readable storage medium according to an embodiment of the present invention, having stored thereon a computer program that, when executed, implements:
responding to a protection signal output by the protection circuit, and outputting a pulse detection signal to a power switch tube of the voltage-multiplying booster circuit; collecting a sampling signal of a voltage-multiplying booster circuit generated according to a pulse detection signal; and detecting the sampling signal abnormality, determining that a boosting inductor in the voltage-multiplying boosting circuit is short-circuited, and executing short-circuit protection.
The operation detection method is suitable for a drive control circuit, and the drive control circuit comprises a voltage-multiplying booster circuit and a protection circuit which are electrically connected.
In this embodiment, if the protection circuit outputs a protection signal, it indicates that the driving control circuit enters a protection state due to an abnormality, and in this protection state, the power switching tube may be configured to be in an off state, and a pulse detection signal is output to the power switching tube of the voltage-doubling boost circuit, and an attempt is made to turn on the power switching tube again, and if the sampling signal is abnormal, it indicates that the abnormality is caused by a boost inductance short circuit, and the power switching tube is quickly turned off by performing short-circuit protection again.
In the above embodiment, the protection circuit includes a first comparator and a second comparator, the voltage-doubling boost circuit is adapted to output the sampling current, the first comparator is adapted to compare the sampling current with a current threshold, if a difference between the sampling current and the current threshold is greater than the comparison threshold, the first comparator outputs a trigger signal to the second comparator, and the trigger signal is adapted to trigger the second comparator to output the protection signal.
Wherein the first comparator and the second comparator may be integrated in one chip.
In the embodiment, the first comparator acquires current information from the sampling resistor and compares the current information, when the current value is larger than a set value, the trigger signal is output to the second comparator, so that the second comparator is triggered to output a protection signal, the protection circuit enters a protection state according to the protection signal and is self-locked, and the switch tube is prevented from being damaged by repeated switching.
When the second comparator enters a protection state, the control signals PFC-in-A and PFC-in-B of the switch tube are pulled down, and the switch tube is prevented from being turned on again by the control signals.
When the second comparator enters a protection state, a control signal PFC-PF is output to the controller, and the controller is informed of overcurrent protection.
In any of the foregoing embodiments, the driving control circuit further includes an amplifying circuit, the amplifying circuit is adapted to be connected to the voltage-doubling boosting circuit and the protection circuit, the protection circuit includes a first comparator and a second comparator, the amplifying circuit includes a third comparator, the third comparator is adapted to perform an amplifying operation on the sampling current output by the voltage-doubling boosting circuit and record the amplified sampling current as the amplifying current, the first comparator is adapted to compare the amplifying current with a current threshold, if the amplifying current is greater than the current threshold, the first comparator outputs a trigger signal to the second comparator, and the trigger signal is adapted to trigger the second comparator to output a protection signal.
In the embodiment, the third comparator in the amplifying circuit acquires current information from the sampling resistor and then amplifies the current information to be input into the first comparator of the comparator, when the current is overlarge through the sampling resistor, the second comparator is triggered to output a protection signal, and after protection, the protection state is started and self-locking is carried out, so that the switch tube is prevented from being damaged by repeated switching.
When the second comparator enters a protection state, the control signals PFC-in-A and PFC-in-B of the switch tube are pulled down, and the switch tube is prevented from being turned on again by the control signals.
When the second comparator enters a protection state, a control signal PFC-PF is output to the controller, and the controller is informed of overcurrent protection.
In any of the above embodiments, the output terminal of the first comparator is adapted to be connected to the first input terminal of the second comparator, if the second comparator is triggered, the voltage of the first input terminal is pulled down to 0V, the voltage of the second input terminal of the second comparator is greater than the voltage of the first input terminal, and the second comparator outputs a low level, where the low level is adapted to pull down the driving signal of the power switch tube to turn off the power switch tube.
In any of the above embodiments, a charging resistor is disposed between the output terminal of the first comparator and the designated power supply, a capacitive element is disposed between the first input terminal of the second comparator and the output terminal of the second comparator, and if the voltage of the second input terminal is greater than the voltage of the first input terminal, the output terminal of the second comparator returns to a high level, wherein the charging duration of the capacitive element is determined according to the charging resistor and an RC constant of the capacitive element.
In this embodiment, the first comparator protection signal is triggered and then output to the second comparator. The pin 3 of the second comparator is pulled down to 0V, and the voltage of the pin 2 of the second comparator is higher than that of the pin 3 of the second comparator, so that the comparator outputs low level to pull down the PFC-in-A and the PFC-in-B and outputs a control signal PFC-PF to the controller. Because the control signal is pulled down, the switch tube is immediately turned off, the input signal of the first comparator is recovered to be normal after the switch tube is turned off, and the output of the IC602-2 is also recovered to be normal. Since the output of the comparator is an open-drain output (i.e., no voltage is output, the pin is grounded when the low level is controlled to be output, and the pin does not output the high level nor the low level when the high level is controlled to be output, and is in a high impedance state), the pin 7 is in a high impedance state at this time. The pin 3 charges the capacitor C617 through the resistor R627, and when the charging voltage is higher than the voltage of the pin 2 (the voltage value is obtained by dividing the voltage by R630 and R200), the output of the second comparator of the comparator returns to the high level, and the charging time t can be calculated through the RC constants of the resistor R627 and the capacitor C617. After the output of the second comparator returns to high level, the capacitor C617 discharges through D605 in preparation for the next protection self-lock.
In any of the above embodiments, outputting a pulse detection signal to the power switch tube of the voltage-doubling boost circuit in response to the protection signal output by the protection circuit specifically includes: responding to a protection signal output by the protection circuit, and determining that the boosting voltage-multiplying circuit has a short-circuit fault; the boosting voltage-multiplying circuit stops running and detects whether the short-circuit fault disappears; and if the short-circuit fault disappears, outputting a pulse detection signal to the power switch tube, wherein the pulse detection signal is suitable for conducting the power switch tube.
In this embodiment, the operation is stopped if a short-circuit fault occurs during the operation, and the operation is also stopped if a short-circuit fault occurs during the start-up. And then enters a failure determination mode. And if the fault signal input still exists, judging that the fault circuit has a fault. If no fault signal is input at the moment, a control pulse is output to control the switching tube to try to open, and if the fault signal has feedback at once, the fault is caused by the short circuit of the inductor.
In any of the above embodiments, further comprising: and if the short-circuit fault still exists, judging that the protection circuit has a fault, and generating a fault prompt signal.
In any of the above embodiments, further comprising: and in the running process of the drive control circuit or the starting running of the drive control circuit, triggering and detecting whether a short-circuit fault occurs.
In any of the above embodiments, detecting a sample signal anomaly further comprises: an inductive short fault signal is generated.
In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", and "front" are used herein,
The directions or positional relationships indicated by "rear" and the like are based on the directions or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or unit must have a specific direction, be configured and operated in a specific direction, and thus, should not be construed as limiting the present invention.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In addition, a plurality described in the present application is specifically at least two.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. 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 (13)

1. An operation detection method, adapted to a drive control circuit including a voltage-multiplying booster circuit and a protection circuit electrically connected to each other, comprising:
responding to a protection signal output by the protection circuit, and outputting a pulse detection signal to a power switch tube of the voltage-multiplying booster circuit;
collecting a sampling signal of the voltage-multiplying booster circuit generated according to the pulse detection signal;
and detecting the sampling signal to be abnormal, determining that a boosting inductor in the voltage-multiplying boosting circuit is short-circuited, and executing short-circuit protection.
2. The operation detection method according to claim 1,
the protection circuit comprises a first comparator and a second comparator, the voltage-multiplying booster circuit is suitable for outputting sampling current, the first comparator is suitable for comparing the sampling current with a current threshold, if the difference value between the sampling current and the current threshold is larger than a comparison threshold, the first comparator outputs a trigger signal to the second comparator, and the trigger signal is suitable for triggering the second comparator to output the protection signal.
3. The operation detection method according to claim 1, wherein the driving control circuit further includes an amplifying circuit, the amplifying circuit is adapted to be connected to the voltage-multiplying voltage boost circuit and the protection circuit, respectively, the protection circuit includes a first comparator and a second comparator, the amplifying circuit includes a third comparator, the third comparator is adapted to perform an amplifying operation on a sampling current output by the voltage-multiplying voltage boost circuit and mark the amplified sampling current as an amplifying current, the first comparator is adapted to compare the amplifying current with a current threshold, if the amplifying current is greater than the current threshold, the first comparator outputs a trigger signal to the second comparator, and the trigger signal is adapted to trigger the second comparator to output the protection signal.
4. The operation detection method according to claim 2 or 3,
the output end of the first comparator is suitable for being connected with the first input end of the second comparator, if the second comparator is triggered, the voltage of the first input end is pulled down to 0V, the voltage of the second input end of the second comparator is larger than the voltage of the first input end, the second comparator outputs a low level, and the low level is suitable for pulling down a driving signal of the power switch tube so as to turn off the power switch tube.
5. The operation detection method according to claim 4, wherein a charging resistor is provided between the output terminal of the first comparator and a prescribed power supply, a capacitive element is provided between the first input terminal of the second comparator and the output terminal of the second comparator, and the output terminal of the second comparator returns to a high level if the voltage of the second input terminal is greater than the voltage of the first input terminal,
wherein the charging time period for the capacitive element is determined according to the charging resistance and the RC constant of the capacitive element.
6. The operation detection method according to any one of claims 1 to 3, wherein outputting a pulse detection signal to a power switch tube of the voltage-doubling boost circuit in response to the protection signal output by the protection circuit specifically includes:
responding to a protection signal output by the protection circuit, and determining that the boosting voltage-multiplying circuit has a short-circuit fault;
the boosting voltage-multiplying circuit stops running and detects whether the short-circuit fault disappears;
and if the short-circuit fault disappears, outputting the pulse detection signal to the power switch tube, wherein the pulse detection signal is suitable for conducting the power switch tube.
7. The operation detection method according to claim 6, further comprising:
and if the short-circuit fault still exists, judging that the protection circuit has a fault, and generating a fault prompt signal.
8. The operation detection method according to claim 6, further comprising:
and in the running process of the drive control circuit or the starting running of the drive control circuit, triggering and detecting whether the short-circuit fault occurs.
9. The operation detection method according to any one of claims 1 to 3, wherein the detecting that the sampling signal is abnormal further comprises:
an inductive short fault signal is generated.
10. An operation detection device adapted to a drive control circuit including a voltage-multiplying booster circuit and a protection circuit electrically connected, the operation detection device comprising: a memory and a processor;
the memory for storing program code;
the processor, configured to invoke the program code to perform the steps of the operation detection method according to any one of claims 1 to 9.
11. An in-vehicle air conditioner, characterized by comprising:
a load;
the driving control circuit is suitable for driving the load to operate and comprises a voltage-multiplying booster circuit and a protection circuit which are electrically connected;
the operation detection device according to claim 10, said operation detection device being adapted to perform the steps of:
responding to a protection signal output by the protection circuit, and outputting a pulse detection signal to a power switch tube of the voltage-multiplying booster circuit;
collecting a sampling signal of the voltage-multiplying booster circuit generated according to the pulse detection signal;
and detecting the sampling signal to be abnormal, determining that a boosting inductor in the voltage-multiplying boosting circuit is short-circuited, and executing short-circuit protection.
12. The vehicle air conditioner according to claim 11,
the load comprises a compressor and/or a fan.
13. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the operation detection method according to any one of claims 1 to 9.
CN202010219617.8A 2020-03-25 2020-03-25 Operation detection method, operation detection device, vehicle-mounted air conditioner and storage medium Pending CN111391611A (en)

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