CN111391609A - Fault detection method and device for voltage doubling circuit, air conditioner and readable storage medium - Google Patents

Fault detection method and device for voltage doubling circuit, air conditioner and readable storage medium Download PDF

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Publication number
CN111391609A
CN111391609A CN202010219417.2A CN202010219417A CN111391609A CN 111391609 A CN111391609 A CN 111391609A CN 202010219417 A CN202010219417 A CN 202010219417A CN 111391609 A CN111391609 A CN 111391609A
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China
Prior art keywords
switching tube
fault
circuit
determining
tested
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CN202010219417.2A
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Chinese (zh)
Inventor
袁光
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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 CN202010219417.2A priority Critical patent/CN111391609A/en
Publication of CN111391609A publication Critical patent/CN111391609A/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 a fault detection method and device of a voltage doubling circuit, an air conditioner and a readable storage medium, wherein a first telescopic air outlet assembly is arranged at the top of the air conditioner, and the fault detection method comprises the following steps: determining the working state of the switching tube in boosting modulation, and recording the working state as the switching tube to be tested; detecting the current flowing through a switching tube to be detected; and determining that the corresponding booster circuit has single-path damage fault according to the current of the switching tube to be tested. By the technical scheme, the reliability and the service life of the switching tube are improved, the detection can be effectively carried out at any time during the operation, and the limitation of load power is avoided.

Description

Fault detection method and device for voltage doubling circuit, air conditioner and readable storage medium
Technical Field
The present invention relates to the field of circuit technologies, and in particular, to a method and an apparatus for detecting a fault in a voltage doubler circuit, an air conditioner, and a computer-readable storage medium.
Background
As shown in fig. 1, the driving circuit of the vehicle-mounted air conditioner comprises a voltage doubling circuit, the voltage doubling circuit comprises two paths of voltage boosting circuits connected in parallel for voltage doubling, so that the power consumption requirement of the vehicle-mounted air conditioner is ensured, and meanwhile, the input current ripple can be effectively reduced due to the adoption of a staggered parallel structure. The voltage stress borne by the switching tube during the turn-off period is only half of the output voltage, so that a low-voltage power switching device can be selected, the switching loss is reduced, and the conversion efficiency of the converter is improved.
Specifically, the input voltage U of the voltage doubling circuit may be a battery voltage, the voltage doubling circuit outputs to the load end P, and an electrolytic capacitor E is connected between the load end P and a ground line, and the method includes the following four stages:
in stage 1, the first switch tube Q1 and the second switch tube Q2 are both in a conducting state, the first inductor L1 and the second inductor L2 store energy, the current of the two inductors rises linearly, and the load is powered by the electrolytic capacitor E.
Wherein, a first voltage-stabilizing diode DZ1 is provided for the first switch tube, and a second voltage-stabilizing diode DZ2 is provided for the second switch tube.
And in the stage 2, the second switching tube Q2 is turned off, the first switching tube Q1 is kept on, the first inductor L1 continues to store energy, the second inductor L2 is connected with the second voltage-multiplying capacitor C2 in series to supply energy to the load through the fourth diode D4, the first voltage-multiplying capacitor C1 is charged through the first switching tube Q1 and the second diode D2, and the voltage stress borne by the second switching tube Q2 is the difference of Vc1 or Vo-Vc 2.
And (3) stage: the second switch Q2 is turned on, the first switch Q1 remains on, and the operation process is the same as that in stage 1.
And 4, the first switch tube Q1 is turned off, the second switch tube Q2 is kept on, the second inductor L2 continues to store energy, the first inductor L1 is in series connection with the first voltage-multiplying capacitor C1 on one hand, the first switch tube Q1 is turned off, the second switch tube Q2 is kept on, the second inductor L2 continues to store energy, the first inductor L1 is in series connection with the C1 on one hand, the third diode D3 supplies energy to the load on the other hand, the second voltage-multiplying capacitor C2 is charged through the second switch tube Q2 and the first diode D1 on the other hand, and the voltage stress borne by the first switch tube Q1 is the difference of Vc2 or Vo-Vc 1.
At time t4, the first switch Q1 turns on, and enters phase 1 again, and the next switching cycle begins.
The sampling current Iq1 of the first switching tube is collected through a first sampling resistor Rs1, and the sampling current Iq2 of the first switching tube is collected through a second sampling resistor Rs 2.
If the booster circuit has problems, the air conditioner will be paralyzed immediately, and the difference of the circuit from other booster circuits is that as long as one of the two channels is damaged, the other channel will continue to work, but the voltage stress borne by the other channel is doubled, and the device type selection parameters are designed according to two phases, so that the power is slightly larger and the power device is inevitably burnt. In the production and operation processes, however, the situations of insufficient soldering, vibration desoldering and the like of components and parts are inevitably caused, so that the situation that a certain channel does not work occurs. Therefore, the effective fault detection method is a reliable guarantee for products.
Moreover, any discussion of the prior art throughout the specification is not an admission that the prior art is necessarily known to a person of ordinary skill in the art, and any discussion of the prior art throughout the specification is not an admission that the prior art is necessarily widely known or forms part of common general knowledge in the field.
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 present invention to provide a method of fault detection for a voltage doubler circuit.
Another object of the present invention is to provide a fault detection apparatus for a voltage doubler circuit.
Another object of the present invention is to provide an air conditioner.
It is another object of the present invention to provide a computer-readable storage medium.
In order to achieve the above object, according to an embodiment of a first aspect of the present invention, there is provided a fault detection method of a voltage doubler circuit, including: determining the working state of the switching tube in boosting modulation, and recording the working state as the switching tube to be tested; detecting the current flowing through the switching tube to be detected; and determining that the corresponding booster circuit has a single-path damage fault according to the current of the switching tube to be tested.
In the technical scheme, when the switching tube is determined to be in the working state of boosting modulation, the single-path damage fault of the corresponding boosting circuit is determined according to the current of the switching tube to be detected, so that the reliability and the service life of the switching tube are improved, the detection can be effectively carried out at any time during the operation period, and the limitation of load power is avoided.
The switching tube to be tested is a first switching tube or a second switching tube, when the single-path booster circuit is damaged, the shutdown processing is immediately carried out, and the display screen reports faults to prompt a user that the air conditioner is out of order and cannot be reused.
In any of the above technical solutions, preferably, determining that the corresponding boost circuit has a single-circuit damage fault according to the current of the switching tube to be tested specifically includes: comparing the magnitude relation between the current of the switching tube to be tested and the threshold current; and determining that the boosting circuit where the switching tube to be tested is positioned has a fault according to the magnitude relation between the current of the switching tube to be tested and the threshold current, and recording the fault as the single-path damage fault.
In the technical scheme, the fault of the booster circuit where the switching tube to be tested is located is determined according to the magnitude relation between the current of the switching tube to be tested and the threshold current, the fault is recorded as the single-path damage fault, when the air conditioner operates, PWM pulses are input to the booster circuit to drive the booster circuit, and no matter what the duty ratio of the PWM pulses is, as long as the switching tube has an opening time period, the corresponding booster circuit has current flowing through the corresponding booster circuit. When the booster circuit is damaged, although the duty ratio of the driving PWM pulse is not 0, the booster circuit does not have current flowing through. Whether the circuit is damaged or not can be judged by the existence of the current. The two channels are completely parallel, and the current in each channel is separately collected. The current flows through the sampling resistor to generate voltage, the voltage is amplified through the amplifier and then is connected with an AD conversion port of the MCU, and finally the voltage acquired by AD is converted into the current through program operation.
In any of the above technical solutions, preferably, determining that the boost circuit in which the switching tube to be tested is located has a fault according to a magnitude relationship between the current of the switching tube to be tested and the threshold current, and recording as the single-path damage fault specifically includes: judging whether the current of the switching tube to be tested is less than or equal to the threshold current; and judging that the current of the switching tube to be tested is less than or equal to the threshold current, determining that the boosting circuit where the switching tube to be tested is positioned has a fault, and recording the fault as the single-path damage fault.
In the technical scheme, the step-up circuit where the switching tube to be tested is located is determined to have a fault by judging that the current of the switching tube to be tested is smaller than or equal to the threshold current, and the fault is recorded as the single-path damage fault, that is, when the step-up circuit is damaged, although the duty ratio of the driving PWM pulse is not 0, the step-up circuit does not have the current flowing.
In any of the above technical solutions, preferably, the method further includes: determining the duty ratio for driving the switching tube to be tested; determining the threshold current from the duty cycle.
In the technical scheme, the threshold current can be more accurately determined by determining the duty ratio for driving the switching tube to be detected and determining the threshold current according to the duty ratio, so that the reliability and the accuracy of the fault detection of the voltage doubling circuit are improved.
In any one of the above technical solutions, preferably, determining the threshold current according to the duty ratio specifically includes: determining an input voltage of the voltage doubling circuit; determining the inductance value of the booster circuit where the switching tube to be tested is located; determining the threshold current according to the input voltage, the inductance value, and the duty cycle.
In this technical solution, by determining the input voltage of the voltage doubler circuit and the inductance value of the voltage boost circuit, and determining the boost gain of the voltage doubler circuit according to the input voltage, the inductance value, and the duty ratio, and further determining the rated value of the on-state current of the switching tube of the one-way voltage boost circuit, that is, the rated value is determined as the threshold current, the reliability of detecting the fault of the one-way voltage boost circuit can be further improved.
In any one of the above technical solutions, preferably, determining the threshold current according to the input voltage, the inductance value, and the duty ratio specifically includes: determining a preset correction coefficient; calculating a ratio between the input voltage and the inductance value; calculating a product between the correction factor, the ratio and the duty cycle, and determining the threshold current from the product.
In the technical scheme, a preset correction coefficient is determined, a product among the correction coefficient, the ratio and the duty ratio is calculated, and an expression of the threshold current is determined according to the product as follows:
and calculating a switch on-time Ton, which is T × Duty, according to the Duty ratio of the driving pulse, wherein T is the period of pwm driving pulse, Duty is the Duty ratio, Ton is the switch on-time, U is the storage battery voltage, namely the input voltage of the booster circuit, L is the inductance value in the single-path booster circuit, U/L is the current rising slope during the on-period of the switch tube, k/2 is a margin coefficient between 0.25 and 0.5, and the typical value is 0.425.
In any of the above technical solutions, preferably, a value range of the correction coefficient is 0.25 to 0.5.
According to a second aspect of the present invention, there is provided a fault detection device for a voltage doubler circuit, comprising: a memory and a processor, the memory being configured to be able to store a computer program, the computer program being able to, when executed by the processor, implement the steps of the method of fault detection of a voltage doubling circuit as defined in any one of the above claims.
According to a third aspect of the present invention, there is provided an air conditioner comprising: a voltage doubler circuit; the fault detection device of the voltage doubling circuit is electrically connected with the voltage doubling circuit, and comprises a memory and a processor, wherein the memory is used for storing a computer program, and the processor executes the computer program so as to realize the steps of the fault detection method of the voltage doubling circuit defined by any one of the technical schemes.
According to an aspect of the fourth aspect of the present invention, there is provided a computer-readable storage medium having a computer program stored thereon, the computer program, when executed, implementing the method for detecting a fault of a voltage-doubler circuit as defined in any one of the above aspects.
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 diagram of a prior art voltage doubler circuit;
FIG. 2 shows a schematic flow diagram of a method of fault detection of a voltage doubling circuit according to an embodiment of the invention;
FIG. 3 shows a schematic flow diagram of a method of fault detection of a voltage doubling circuit according to another embodiment of the invention;
FIG. 4 shows a schematic block diagram of a fault detection arrangement for a voltage doubling circuit according to an embodiment of the present invention;
FIG. 5 illustrates a schematic block diagram of an air conditioner according to an embodiment of the present invention;
FIG. 6 shows a schematic block diagram of a computer-readable storage medium according to an embodiment of the 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 by the specific embodiments disclosed below.
Embodiments of a method and an apparatus for detecting a fault of a voltage doubling circuit, an air conditioner, and a computer readable storage medium according to embodiments of the present invention are specifically described below with reference to fig. 2 to 6.
As shown in fig. 2, the method for detecting a fault of a voltage doubling circuit according to an embodiment of the present invention includes: step S102, determining that the switching tube is in a boosting modulation working state, and recording the working state as the switching tube to be tested; step S104, detecting the current flowing through the switching tube to be detected; and S106, determining that the corresponding booster circuit has a single-path damage fault according to the current of the switching tube to be tested.
In the technical scheme, when the switching tube is determined to be in the working state of boosting modulation, the single-path damage fault of the corresponding boosting circuit is determined according to the current of the switching tube to be detected, so that the reliability and the service life of the switching tube are improved, the detection can be effectively carried out at any time during the operation period, and the limitation of load power is avoided.
The switching tube to be tested is a first switching tube or a second switching tube, when the single-path booster circuit is damaged, the shutdown processing is immediately carried out, and the display screen reports faults to prompt a user that the air conditioner is out of order and cannot be reused.
In any of the above technical solutions, preferably, determining that the corresponding boost circuit has a single-circuit damage fault according to the current of the switching tube to be tested specifically includes: comparing the magnitude relation between the current of the switching tube to be tested and the threshold current; and determining that the boosting circuit where the switching tube to be tested is positioned has a fault according to the magnitude relation between the current of the switching tube to be tested and the threshold current, and recording the fault as the single-path damage fault.
In the technical scheme, the fault of the booster circuit where the switching tube to be tested is located is determined according to the magnitude relation between the current of the switching tube to be tested and the threshold current, the fault is recorded as the single-path damage fault, when the air conditioner operates, PWM pulses are input to the booster circuit to drive the booster circuit, and no matter what the duty ratio of the PWM pulses is, as long as the switching tube has an opening time period, the corresponding booster circuit has current flowing through the corresponding booster circuit. When the booster circuit is damaged, although the duty ratio of the driving PWM pulse is not 0, the booster circuit does not have current flowing through. Whether the circuit is damaged or not can be judged by the existence of the current. The two channels are completely parallel, and the current in each channel is separately collected. The current flows through the sampling resistor to generate voltage, the voltage is amplified through the amplifier and then is connected with an AD conversion port of the MCU, and finally the voltage acquired by AD is converted into the current through program operation.
In any of the above technical solutions, preferably, determining that the boost circuit in which the switching tube to be tested is located has a fault according to a magnitude relationship between the current of the switching tube to be tested and the threshold current, and recording as the single-path damage fault specifically includes: judging whether the current of the switching tube to be tested is less than or equal to the threshold current; and judging that the current of the switching tube to be tested is less than or equal to the threshold current, determining that the boosting circuit where the switching tube to be tested is positioned has a fault, and recording the fault as the single-path damage fault.
In the technical scheme, the step-up circuit where the switching tube to be tested is located is determined to have a fault by judging that the current of the switching tube to be tested is smaller than or equal to the threshold current, and the fault is recorded as the single-path damage fault, that is, when the step-up circuit is damaged, although the duty ratio of the driving PWM pulse is not 0, the step-up circuit does not have the current flowing.
In any of the above technical solutions, preferably, the method further includes: determining the duty ratio for driving the switching tube to be tested; determining the threshold current from the duty cycle.
In the technical scheme, the threshold current can be more accurately determined by determining the duty ratio for driving the switching tube to be detected and determining the threshold current according to the duty ratio, so that the reliability and the accuracy of the fault detection of the voltage doubling circuit are improved.
In any one of the above technical solutions, preferably, determining the threshold current according to the duty ratio specifically includes: determining an input voltage of the voltage doubling circuit; determining the inductance value of the booster circuit where the switching tube to be tested is located; determining the threshold current according to the input voltage, the inductance value, and the duty cycle.
In this technical solution, by determining the input voltage of the voltage doubler circuit and the inductance value of the voltage boost circuit, and determining the boost gain of the voltage doubler circuit according to the input voltage, the inductance value, and the duty ratio, and further determining the rated value of the on-state current of the switching tube of the one-way voltage boost circuit, that is, the rated value is determined as the threshold current, the reliability of detecting the fault of the one-way voltage boost circuit can be further improved.
In any one of the above technical solutions, preferably, determining the threshold current according to the input voltage, the inductance value, and the duty ratio specifically includes: determining a preset correction coefficient; calculating a ratio between the input voltage and the inductance value; calculating a product between the correction factor, the ratio and the duty cycle, and determining the threshold current from the product.
In the technical scheme, a preset correction coefficient is determined, a product among the correction coefficient, the ratio and the duty ratio is calculated, and an expression of the threshold current is determined according to the product as follows:
and calculating a switch on-time Ton, which is T × Duty, according to the Duty ratio of the driving pulse, wherein T is the period of pwm driving pulse, Duty is the Duty ratio, Ton is the switch on-time, U is the storage battery voltage, namely the input voltage of the booster circuit, L is the inductance value in the single-path booster circuit, U/L is the current rising slope during the on-period of the switch tube, k/2 is a margin coefficient between 0.25 and 0.5, and the typical value is 0.425.
As shown in fig. 3, a fault detection method of a voltage doubling circuit according to another embodiment of the present invention includes:
step S202, determining whether the duty ratio of the driving pulse is 0, if so, repeating the step S202, otherwise, executing the step S204.
And step S204, collecting the currents Iq1 and Iq2 of the two channels respectively.
In step S206, it is determined whether any one of Iq1 and Iq2 is smaller than threshold current Ith, if so, step S208 is executed, otherwise, step S202 is returned to.
And S208, if the single path is damaged, prohibiting the air conditioner from running and prompting.
As shown in fig. 4, the fault detection apparatus 300 of the voltage doubling circuit according to the embodiment of the present invention includes: a memory 302 and a processor 304, the memory 302 being configured to be able to store a computer program, the computer program, when executed by the processor 304, being able to implement the steps of the method of fault detection of a voltage doubling circuit as defined in any of the above-mentioned claims.
As shown in fig. 5, the air conditioner 400 according to the embodiment of the present invention includes: a voltage doubler circuit 402; the fault detection device 300 of the voltage doubling circuit 402 is connected to the voltage doubling circuit 402, and the fault detection device 300 of the voltage doubling circuit 402 comprises a memory for storing a computer program and a processor for executing the computer program to realize the steps of the fault detection method of the air conditioner 400 as defined in any one of the above technical solutions.
As shown in fig. 6, according to the computer-readable storage medium 500 of the embodiment of the present invention, the computer-readable storage medium has a computer program stored thereon, and when the computer program is executed by the air conditioner 400, the method for detecting the fault of the voltage doubling circuit as defined in any one of the above technical solutions is implemented, and specifically includes the following steps: determining the working state of the switching tube in boosting modulation, and recording the working state as the switching tube to be tested; detecting the current flowing through the switching tube to be detected; and determining that the corresponding booster circuit has a single-path damage fault according to the current of the switching tube to be tested.
In the technical scheme, when the switching tube is determined to be in the working state of boosting modulation, the single-path damage fault of the corresponding boosting circuit is determined according to the current of the switching tube to be detected, so that the reliability and the service life of the switching tube are improved, the detection can be effectively carried out at any time during the operation period, and the limitation of load power is avoided.
The switching tube to be tested is a first switching tube or a second switching tube, when the single-path booster circuit is damaged, the shutdown processing is immediately carried out, and the display screen reports faults to prompt a user that the air conditioner is out of order and cannot be reused.
In any of the above technical solutions, preferably, determining that the corresponding boost circuit has a single-circuit damage fault according to the current of the switching tube to be tested specifically includes: comparing the magnitude relation between the current of the switching tube to be tested and the threshold current; and determining that the boosting circuit where the switching tube to be tested is positioned has a fault according to the magnitude relation between the current of the switching tube to be tested and the threshold current, and recording the fault as the single-path damage fault.
In the technical scheme, the fault of the booster circuit where the switching tube to be tested is located is determined according to the magnitude relation between the current of the switching tube to be tested and the threshold current, the fault is recorded as the single-path damage fault, when the air conditioner operates, PWM pulses are input to the booster circuit to drive the booster circuit, and no matter what the duty ratio of the PWM pulses is, as long as the switching tube has an opening time period, the corresponding booster circuit has current flowing through the corresponding booster circuit. When the booster circuit is damaged, although the duty ratio of the driving PWM pulse is not 0, the booster circuit does not have current flowing through. Whether the circuit is damaged or not can be judged by the existence of the current. The two channels are completely parallel, and the current in each channel is separately collected. The current flows through the sampling resistor to generate voltage, the voltage is amplified through the amplifier and then is connected with an AD conversion port of the MCU, and finally the voltage acquired by AD is converted into the current through program operation.
In any of the above technical solutions, preferably, determining that the boost circuit in which the switching tube to be tested is located has a fault according to a magnitude relationship between the current of the switching tube to be tested and the threshold current, and recording as the single-path damage fault specifically includes: judging whether the current of the switching tube to be tested is less than or equal to the threshold current; and judging that the current of the switching tube to be tested is less than or equal to the threshold current, determining that the boosting circuit where the switching tube to be tested is positioned has a fault, and recording the fault as the single-path damage fault.
In the technical scheme, the step-up circuit where the switching tube to be tested is located is determined to have a fault by judging that the current of the switching tube to be tested is smaller than or equal to the threshold current, and the fault is recorded as the single-path damage fault, that is, when the step-up circuit is damaged, although the duty ratio of the driving PWM pulse is not 0, the step-up circuit does not have the current flowing.
In any of the above technical solutions, preferably, the method further includes: determining the duty ratio for driving the switching tube to be tested; determining the threshold current from the duty cycle.
In the technical scheme, the threshold current can be more accurately determined by determining the duty ratio for driving the switching tube to be detected and determining the threshold current according to the duty ratio, so that the reliability and the accuracy of the fault detection of the voltage doubling circuit are improved.
In any one of the above technical solutions, preferably, determining the threshold current according to the duty ratio specifically includes: determining an input voltage of the voltage doubling circuit; determining the inductance value of the booster circuit where the switching tube to be tested is located; determining the threshold current according to the input voltage, the inductance value, and the duty cycle.
In this technical solution, by determining the input voltage of the voltage doubler circuit and the inductance value of the voltage boost circuit, and determining the boost gain of the voltage doubler circuit according to the input voltage, the inductance value, and the duty ratio, and further determining the rated value of the on-state current of the switching tube of the one-way voltage boost circuit, that is, the rated value is determined as the threshold current, the reliability of detecting the fault of the one-way voltage boost circuit can be further improved.
In any one of the above technical solutions, preferably, determining the threshold current according to the input voltage, the inductance value, and the duty ratio specifically includes: determining a preset correction coefficient; calculating a ratio between the input voltage and the inductance value; calculating a product between the correction factor, the ratio and the duty cycle, and determining the threshold current from the product.
In the technical scheme, a preset correction coefficient is determined, a product among the correction coefficient, the ratio and the duty ratio is calculated, and an expression of the threshold current is determined according to the product as follows:
and calculating a switch on-time Ton (T × Duty) according to the Duty ratio of the driving pulse, wherein T is the period of pwm driving pulse, Duty is the Duty ratio, Ton is the switch on-time, U is the battery voltage, namely the input voltage of the booster circuit, L is the inductance value in the single-path booster circuit, U/L is the current rising slope during the on-period of the switch tube, k/2 is a margin coefficient between 0.25 and 0.5, and the typical value is 0.425.
In any of the above technical solutions, preferably, a value range of the correction coefficient is 0.25 to 0.5.
The technical scheme of the invention is explained in detail in the above with reference to the accompanying drawings, and the invention provides a fault detection method and device of a voltage doubling circuit, an air conditioner and a computer readable storage medium.
The steps in the method of the invention can be sequentially adjusted, combined and deleted according to actual needs.
The units in the device of the invention can be merged, divided and deleted according to actual needs.
It will be understood by those skilled in the art that all or part of the steps in the methods of the embodiments described above may be implemented by instructions associated with a program, which may be stored in a computer-readable storage medium, where the storage medium includes Read-Only Memory (ROM), Random Access Memory (RAM), Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (EPROM), One-time Programmable Read-Only Memory (OTPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), compact disc-Read-Only Memory (CD-ROM), or other Memory, magnetic disk, magnetic tape, or magnetic tape, Or any other medium which can be used to carry or store data and which can be read by a computer.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to 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 (10)

1. A fault detection method of a voltage doubling circuit comprises two paths of voltage boosting circuits which are connected in parallel for voltage doubling, and a switching tube for boosting modulation is arranged in any one of the voltage boosting circuits, and is characterized by comprising the following steps:
determining the working state of the switching tube in boosting modulation, and recording the working state as the switching tube to be tested;
detecting the current flowing through the switching tube to be detected;
and determining that the corresponding booster circuit has a single-path damage fault according to the current of the switching tube to be tested.
2. The method for detecting the fault of the voltage doubling circuit according to claim 1, wherein the step of determining that the corresponding boost circuit has the single-circuit damage fault according to the current of the switching tube to be tested specifically comprises:
comparing the magnitude relation between the current of the switching tube to be tested and the threshold current;
and determining that the boosting circuit where the switching tube to be tested is positioned has a fault according to the magnitude relation between the current of the switching tube to be tested and the threshold current, and recording the fault as the single-path damage fault.
3. The method for detecting the fault of the voltage doubling circuit according to claim 2, wherein determining that the boost circuit in which the switching tube to be tested is located has a fault according to the magnitude relationship between the current of the switching tube to be tested and the threshold current, and recording the fault as the single-path damage fault specifically comprises:
judging whether the current of the switching tube to be tested is less than or equal to the threshold current;
and judging that the current of the switching tube to be tested is less than or equal to the threshold current, determining that the boosting circuit where the switching tube to be tested is positioned has a fault, and recording the fault as the single-path damage fault.
4. The method of claim 3, further comprising:
determining the duty ratio for driving the switching tube to be tested;
determining the threshold current from the duty cycle.
5. The method for detecting a fault in a voltage doubling circuit according to claim 4, wherein determining the threshold current according to the duty cycle comprises:
determining an input voltage of the voltage doubling circuit;
determining the inductance value of the booster circuit where the switching tube to be tested is located;
determining the threshold current according to the input voltage, the inductance value, and the duty cycle.
6. The method for detecting a fault in a voltage doubling circuit according to claim 5, wherein determining the threshold current according to the input voltage, the inductance value, and the duty cycle comprises:
determining a preset correction coefficient;
calculating a ratio between the input voltage and the inductance value;
calculating a product between the correction factor, the ratio and the duty cycle, and determining the threshold current from the product.
7. The method of claim 6, wherein the voltage doubler circuit is configured to detect the voltage drop,
the value range of the correction coefficient is 0.25-0.5.
8. A fault detection device for a voltage doubling circuit, the fault detection device comprising:
a memory and a processor, the memory being configured to be able to store a computer program which, when executed by the processor, is able to implement the steps of the method of fault detection of a voltage doubling circuit as claimed in any of claims 1 to 7.
9. An air conditioner, comprising:
a voltage doubler circuit;
an operating device electrically connected to the voltage doubling circuit, the operating device comprising a memory for storing a computer program and a processor executing the computer program to implement the steps of the method of fault detection of a voltage doubling circuit according to any of claims 1 to 7.
10. A computer-readable storage medium, characterized in that a computer program is stored thereon, which when executed implements a method of fault detection of a voltage doubler circuit according to any one of claims 1 to 7.
CN202010219417.2A 2020-03-25 2020-03-25 Fault detection method and device for voltage doubling circuit, air conditioner and readable storage medium Pending CN111391609A (en)

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Publication number Priority date Publication date Assignee Title
CN104600973A (en) * 2014-12-31 2015-05-06 广东美的制冷设备有限公司 Control method and device for staggered PFC (positive feedback circuit) of air conditioner
CN107210673A (en) * 2015-03-27 2017-09-26 三菱电机株式会社 Increasing apparatus and converter apparatus
CN108702089A (en) * 2016-02-24 2018-10-23 三菱电机株式会社 Converter apparatus
KR20190060220A (en) * 2017-11-24 2019-06-03 엘지전자 주식회사 Interleaved pfc contol device
CN110601531A (en) * 2019-10-31 2019-12-20 广东美的制冷设备有限公司 Power supply control circuit and vehicle-mounted air conditioner

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104600973A (en) * 2014-12-31 2015-05-06 广东美的制冷设备有限公司 Control method and device for staggered PFC (positive feedback circuit) of air conditioner
CN107210673A (en) * 2015-03-27 2017-09-26 三菱电机株式会社 Increasing apparatus and converter apparatus
CN108702089A (en) * 2016-02-24 2018-10-23 三菱电机株式会社 Converter apparatus
KR20190060220A (en) * 2017-11-24 2019-06-03 엘지전자 주식회사 Interleaved pfc contol device
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