CN116298783A

CN116298783A - Fault detection method and fault detection device of driving circuit and electrical equipment

Info

Publication number: CN116298783A
Application number: CN202310136413.1A
Authority: CN
Inventors: 刘文龙; 毕然; 冯君璞; 张杰楠; 周宏明; 请求不公布姓名; 罗琼; 徐云松; 李吉
Original assignee: GD Midea Air Conditioning Equipment Co Ltd; Guangzhou Hualing Refrigeration Equipment Co Ltd
Current assignee: GD Midea Air Conditioning Equipment Co Ltd; Guangzhou Hualing Refrigeration Equipment Co Ltd
Priority date: 2023-02-17
Filing date: 2023-02-17
Publication date: 2023-06-23

Abstract

The invention discloses a fault detection method, a fault detection device and electrical equipment of a driving circuit, wherein the driving circuit comprises a rectifying unit, a PFC unit and at least one inversion unit which are integrated on the same power IC, and the method comprises the following steps: controlling a power switch tube in the PFC unit to alternately work, acquiring the inductance current change trend of the PFC unit, and detecting faults of the PFC unit according to the inductance current change trend; and sequentially carrying out fault detection on each inversion unit according to the switching time sequence of the switching tube in the inversion unit and the output current direction of the inversion unit. Therefore, the method can detect faults of the PFC unit according to the change trend of the inductance current, and detect faults of the inversion unit according to the switching time sequence of the switching tube in the inversion unit and the output current direction of the inversion unit, so that accurate fault positioning of the high-integration power IC is realized, and faults of all components in the high-integration power IC can be detected rapidly.

Description

Fault detection method and fault detection device of driving circuit and electrical equipment

Technical Field

The present invention relates to the field of electrical equipment, and in particular, to a fault detection method for a driving circuit, an electronic control board, a computer readable storage medium, a fault detection device for a driving circuit, and an electrical equipment.

Background

The existing air conditioner external unit driving circuit adopts: the forms of rectifier bridge, boost rectifier, compressor inverter circuit, and fan inverter circuit require the use of 4 sets of power ICs (Integrated Circuit Chip, microelectronics). The ICs of the discrete devices all need a relatively large space occupation and matched circuits, the driving circuits in the related art are difficult to meet the requirements of higher and higher power density of the controller, and the fault location detection of the driving circuits is difficult to realize.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, a first object of the present invention is to provide a fault detection method for a driving circuit, which can detect faults of PFC units in highly integrated power ICs according to a trend of variation of inductance current, and detect faults of inverter units in the highly integrated power ICs according to a switching timing of switching transistors in the inverter units and an output current direction of the inverter units, so as to implement accurate fault location of the highly integrated power ICs, and detect faults of each component in the highly integrated power ICs rapidly.

A second object of the present invention is to provide an electric control board.

A third object of the present invention is to propose a computer readable storage medium.

A fourth object of the present invention is to provide a fault detection device for a driving circuit.

A fifth object of the present invention is to propose an electrical device.

To achieve the above object, an embodiment of the present invention provides a fault detection method for a driving circuit, the driving circuit including a rectifying unit, a PFC (Power Factor Correction ) unit and at least one inverting unit integrated on the same power IC, the fault detection method for the driving circuit including: controlling a power switch tube in the PFC unit to alternately work, acquiring the inductance current change trend of the PFC unit, and detecting faults of the PFC unit according to the inductance current change trend; and sequentially carrying out fault detection on each inversion unit according to the switching time sequence of the switching tube in the inversion unit and the output current direction of the inversion unit.

According to the fault detection method of the driving circuit, which is disclosed by the embodiment of the invention, the driving circuit comprises a rectifying unit, a PFC unit and at least one inversion unit which are integrated on the same power IC, the fault detection method of the driving circuit firstly responds to a fault detection instruction, a power switching tube in the PFC unit is controlled to alternately work, the inductance current change trend of the PFC unit is obtained, the PFC unit is subjected to fault detection according to the inductance current change trend, and each inversion unit is sequentially subjected to fault detection according to the switching time sequence of the switching tube in the inversion unit and the output current direction of the inversion unit. Therefore, the method can detect faults of the PFC unit in the highly integrated power IC according to the change trend of the inductance current, and detect faults of the inversion unit in the highly integrated power IC according to the switching time sequence of the switching tube in the inversion unit and the output current direction of the inversion unit, so that accurate fault positioning of the highly integrated power IC is realized, and faults of all components in the highly integrated power IC can be detected rapidly.

In addition, the fault detection method of the driving circuit according to the above embodiment of the present invention may further have the following additional technical features:

according to one embodiment of the present invention, fault detection is performed on a PFC unit according to an inductance current variation trend, including: and if the inductance current is determined to be increased when the power switch tube is turned on and is reduced when the power switch tube is turned off according to the inductance current change trend, determining that the PFC unit has no fault, otherwise, determining that the PFC unit has fault.

According to one embodiment of the present invention, fault detection is performed on each inverter unit in turn according to a switching timing of a switching transistor in the inverter unit and an output current direction of the inverter unit, including: the upper bridge switching tube and the lower bridge switching tube of the current inversion unit are controlled to be turned on or turned off according to a given switching time sequence, and the current direction of each phase output by the inversion unit is determined; if the given switch time sequence is matched with the current direction of each phase, determining that the current inversion unit has no fault, otherwise, determining that the current inversion unit has fault.

According to one embodiment of the invention, when an upper bridge switching tube of a first phase bridge arm, a lower bridge switching tube of a second phase bridge arm and a lower bridge switching tube of a third phase bridge arm are conducted and a lower bridge switching tube of the first phase bridge arm, an upper bridge switching tube of the second phase bridge arm and an upper bridge switching tube of the third phase bridge arm are turned off in the current inversion unit, if the first phase current of the current inversion unit is positive, the second phase current and the third phase current are negative, the given switching time sequence is determined to be matched with each phase current direction.

According to one embodiment of the invention, when the lower bridge switching tube of the first phase bridge arm, the upper bridge switching tube of the second phase bridge arm and the lower bridge switching tube of the third phase bridge arm are conducted and the upper bridge switching tube of the first phase bridge arm, the lower bridge switching tube of the second phase bridge arm and the upper bridge switching tube of the third phase bridge arm are turned off in the current inversion unit, if the first phase current of the current inversion unit is negative, the second phase current is positive and the third phase current is negative, the given switching time sequence is determined to be matched with the current direction of each phase.

According to one embodiment of the invention, when the lower bridge switching tube of the first phase bridge arm, the lower bridge switching tube of the second phase bridge arm and the upper bridge switching tube of the third phase bridge arm are conducted and the upper bridge switching tube of the first phase bridge arm, the upper bridge switching tube of the second phase bridge arm and the lower bridge switching tube of the third phase bridge arm are turned off in the current inversion unit, if the first phase current and the second phase current of the current inversion unit are negative and the third phase current is positive, the given switching time sequence is determined to be matched with the current direction of each phase.

In order to achieve the above object, a second embodiment of the present invention provides an electronic control board, which includes a memory, a processor, and a fault detection program of a driving circuit stored in the memory and capable of running on the processor, wherein the fault detection method of the driving circuit is implemented when the processor executes the fault detection program of the driving circuit.

According to the electric control board provided by the embodiment of the invention, based on the fault detection method of the driving circuit, accurate fault positioning of the high-integration power IC is realized, and faults of all components in the high-integration power IC can be detected rapidly.

To achieve the above object, a third aspect of the present invention provides a computer-readable storage medium having stored thereon a failure detection program of a driving circuit, which when executed by a processor, implements the above-described failure detection method of the driving circuit.

According to the computer readable storage medium, based on the fault detection method of the driving circuit, accurate fault positioning of the high-integration power IC is realized, and faults of all components in the high-integration power IC can be detected rapidly.

To achieve the above object, a fourth aspect of the present invention provides a fault detection device for a driving circuit, the driving circuit including a rectifying unit, a PFC unit, and at least one inverting unit integrated on the same power IC, the fault detection device for the driving circuit including: the current detection unit is used for respectively detecting the inductance current of the PFC unit and the output current of each inversion unit; the control unit is used for controlling the power switching tube in the PFC unit to alternately work, determining the change trend of the inductance current according to the inductance current of the PFC unit, detecting faults of the PFC unit according to the change trend of the inductance current, and sequentially detecting faults of each inversion unit according to the switching time sequence of the switching tube in the inversion unit and the output current direction of the inversion unit.

According to the fault detection device of the driving circuit, the driving circuit comprises a rectifying unit, a PFC unit and at least one inversion unit which are integrated on the same power IC, the fault detection device of the driving circuit respectively detects the inductance current of the PFC unit and the output current of each inversion unit through a current detection unit, a control unit controls a power switch tube in the PFC unit to alternately work, determines the change trend of the inductance current according to the inductance current of the PFC unit, performs fault detection on the PFC unit according to the change trend of the inductance current, and sequentially performs fault detection on each inversion unit according to the switch time sequence of the switch tube in the inversion unit and the output current direction of the inversion unit. Therefore, the device can detect faults of the PFC unit in the highly integrated power IC according to the change trend of the inductance current, and detect faults of the inversion unit in the highly integrated power IC according to the switching time sequence of the switching tube in the inversion unit and the output current direction of the inversion unit, so that accurate fault positioning of the highly integrated power IC is realized, and faults of all components in the highly integrated power IC can be detected rapidly.

To achieve the above object, a fifth aspect of the present invention provides an electrical apparatus, including: the driving circuit comprises a rectifying unit, a PFC unit and at least one inversion unit which are integrated on the same power IC; the fault detection device of the driving circuit is used for sequentially detecting faults of the PFC units and each inversion unit.

According to the electrical equipment provided by the embodiment of the invention, based on the fault detection device of the driving circuit, accurate fault positioning of the high-integration power IC is realized, and faults of all components in the high-integration power IC can be rapidly detected.

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

Fig. 1 is a flowchart of a fault detection method of a driving circuit according to an embodiment of the present invention;

FIG. 2 is a circuit topology of a drive circuit according to one embodiment of the invention;

fig. 3 is a circuit topology diagram of a PFC unit according to an embodiment of the present invention;

fig. 4 is a waveform diagram of a test current of a PFC unit according to an embodiment of the present invention;

fig. 5 is a circuit topology of an inverter unit according to an embodiment of the present invention;

FIG. 6 is a flow chart of a method for detecting a fault of a driving circuit according to an embodiment of the present invention;

fig. 7 is a block diagram of an electronic control board according to an embodiment of the present invention;

fig. 8 is a block diagram of a failure detection apparatus of a driving circuit according to an embodiment of the present invention;

fig. 9 is a block diagram of an electrical device according to an embodiment of the present invention.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.

The fault detection method, the electronic control board, the computer-readable storage medium, the fault detection device of the driving circuit and the electrical equipment according to the embodiments of the present invention are described below with reference to the accompanying drawings.

Fig. 1 is a flowchart of a fault detection method of a driving circuit according to an embodiment of the present invention. The driving circuit may be disposed on an electrical apparatus, which may be an air conditioner, a refrigerator, or the like, without limitation.

In one embodiment of the invention, the driving circuit comprises a rectifying unit, a PFC unit and at least one inverting unit integrated on the same power IC.

Specifically, taking an example that the driving circuit is applied to the air conditioner, as shown in fig. 2, the driving circuit is integrated with a rectifying unit 10, a PFC unit 20, a first motor inversion unit 30, and a second motor inversion unit 40, wherein the first motor inversion unit 30 is connected to a compressor motor of the air conditioner, and the second motor inversion unit 40 is connected to a fan of the air conditioner. The driving circuit integrates the rectifying unit 10, the PFC unit 20, the first motor inversion unit 30 and the second motor inversion unit 40 to a high degree, and at this time, the air conditioner only needs to use one set of power IC, so that the occupied space is reduced, and the circuit connection is simplified. In the application process, the rectifying unit 10 is connected with an ac power supply, converts ac power into dc power, inputs the dc power into the PFC unit 20, the PFC unit 20 performs power factor correction on the received dc power, and inputs the corrected dc power into the first motor inverter unit 30 and the second motor inverter unit 40 as dc power supplies of the first motor inverter unit 30 and the second motor inverter unit 40, and the first motor inverter unit 30 and the second motor inverter unit 40 convert the input dc power into ac power through conduction control of a switching tube, and output the ac power to three-phase windings of a compressor motor and a fan, respectively, thereby performing drive control on the compressor and the fan.

It should be noted that the driving circuit including two inverter units is only one implementation manner of the present invention, and may be integrated according to practical situations, which is not limited herein. It can be understood that when the driving circuit fails, the air conditioner cannot operate normally, and the failure detection method of the driving circuit of the present application will be described in detail below by taking the application of the driving circuit to electrical equipment as an example.

As shown in fig. 1, the fault detection method of the driving circuit may include the steps of:

s1, controlling a power switch tube in a PFC unit to alternately work, acquiring an inductance current change trend of the PFC unit, and detecting faults of the PFC unit according to the inductance current change trend;

s2, sequentially detecting faults of each inversion unit according to the switching time sequence of a switching tube in the inversion unit and the output current direction of the inversion unit.

Specifically, after the electrical equipment receives a fault detection instruction of the driving circuit, the rectifying unit inputs the rectified direct current into the PFC unit in response to the fault detection instruction, the controller alternately controls the on and off of a power switching tube in the PFC unit, acquires the inductance current of the PFC unit in real time, and determines the change trend of the inductance current in the on or off process of the power switching tube according to the inductance current acquired in real time, so that whether the PFC unit has a fault is judged. After the fault detection of the PFC unit is completed, the PFC unit is controlled according to a normal working mode, then switching tubes on bridge arms in the inversion unit are controlled to conduct sequentially, output currents of the inversion unit are collected in real time, the direction of the obtained output currents is judged, and whether the inversion unit has faults or not is determined according to the switching sequence of the switching tubes and the direction of the output currents. Therefore, the method can detect faults of the PFC unit in the highly integrated power IC according to the change trend of the inductance current, and detect faults of the inversion unit in the highly integrated power IC according to the switching time sequence of the switching tube in the inversion unit and the output current direction of the inversion unit, so that accurate fault positioning of the highly integrated power IC is realized, and faults of all components in the highly integrated power IC can be detected rapidly.

In the above-mentioned fault detection method, during the detection of the inverter units, the fault detection may be sequentially performed on the plurality of inverter units integrated in the driving circuit, or the fault detection may be performed on the plurality of inverter units at the same time, which is not limited herein. In addition, the fault detection method can be started to be executed after receiving a fault detection instruction, can also be automatically executed after the applied electrical equipment is electrified, and the starting condition can be set according to actual conditions.

It should be further noted that the above-mentioned fault detection process for the inverter is performed after the fault detection for the PFC unit is performed, which is only one implementation manner of the present application. Since the direct current output by the PFC unit may have a voltage decrease when the PFC unit fails, but the failure detection process of the inverter unit is not affected, it is also possible to perform the failure detection process of the inverter unit first, and then perform the failure detection of the PFC unit, which may be specifically set by itself, in addition to the above detection sequence.

The fault detection methods of the PFC unit and the inverter unit are described in detail below.

Specifically, taking fig. 3 as an example, the PFC unit adopts an NPN transistor as a power switch tube Ug1, a b pole of the power switch tube Ug1 is connected as a control end to the controller 50, a C pole of the power switch tube Ug1 is connected to one end of the inductor L, an e pole of the power switch tube Ug1 is connected to one output end of the rectifying unit, the other end of the inductor L is connected to the other output end of the rectifying unit, an anode of the diode D is connected to a C pole of the power switch tube Ug1, the other end is connected to one end of the bus capacitor C, and the other end of the bus capacitor C is connected to an e pole of the power switch tube Ug1, and is used as the other output end of the PFC unit, and the PFC unit outputs the corrected direct current Udc.

The controller 50 outputs a pulse signal with a constant pulse width as a control signal to the b pole of the power switch tube Ug1 to control the on-off of the power switch tube Ug1, and acquires the inductor current in real time through the current acquisition unit 51 and acquires the direct current Udc output by the PFC unit through the voltage acquisition unit 52. When the PFC unit works normally, namely the vulnerable device power switch tube Ug1 and the inductor L do not have faults, the inductor current IL is in an increasing trend when the power switch tube Ug1 is conducted, and the inductor current IL is in a decreasing trend when the power switch tube Ug1 is turned off. For example, as shown in fig. 4, the pulse signal output by the controller is at a high level in the 0-T0 stage, the power switch tube Ug1 is turned on, and at this time, the inductor current IL is in an ascending trend; the pulse signal is at a low level in the phase T0-T1, the power switch tube Ug1 is disconnected, and at the moment, the inductance current IL is in a descending trend; the pulse signal is at a high level in the phase T1-T2, the power switch tube Ug1 is conducted, and the inductance current IL is in an ascending trend; the pulse signal is low level in the stage T2-T3, the power switch tube Ug1 is disconnected, the inductance current IL is in a descending trend, and the current power switch tube Ug1 and the inductance current IL are judged to be normal, and the PFC unit has no fault. Otherwise, the present power switching tube Ug1 and the inductance current IL are considered to be abnormal, the PFC unit fails, and the controller 50 sends failure alarm information to the user terminal.

It should be noted that, fig. 4 controls the power switching tube Ug1 in the PFC unit to perform the on-off alternating operation through two pulse signals, and performs the fault detection on the PFC unit based on the inductance current variation trend obtained in the two pulse periods, which is an implementation manner of the present invention, and may be specifically applied according to the actual situation, for example, may perform the fault detection on the PFC unit based on the inductance current variation trend obtained in the three pulse periods. In addition, the pulse signal corresponds to the type of the power switch tube Ug1 in the PFC unit, and in the fault detection process, the pulse signal can be set according to actual conditions.

In addition, when the PFC unit fails, the output dc voltage Udc may be reduced, but the fault detection process of the inverter unit is not affected, so that the fault detection operation of the inverter unit may be continued when the PFC unit fails.

Specifically, taking fig. 5 as an example, the controller 50 outputs a control signal to control on or off of the switching transistors Q1, Q2, Q3, Q4, Q5, and Q6 in the inverter unit on the one hand, so as to realize output of three-phase currents; and the three-phase currents Ia, ib and Ic output by the inversion unit are acquired, the current direction of each phase of current is determined according to the positive and negative of the current values of the three-phase currents Ia, ib and Ic, and then whether the inversion unit fails is judged according to the switching time sequence of the switching tubes Q1, Q2, Q3, Q4, Q5 and Q6 and the current directions of the three-phase currents Ia, ib and Ic. When the switching time sequence of the switching tube is not matched with the current direction of each phase, the current inversion unit is determined to be in fault, and the controller sends an alarm signal to the user terminal and simultaneously controls the electrical equipment to stop running.

It should be noted that, the controller 50 may store the correspondence between the switching time sequence of the switching tube and the current direction of each phase in advance, call the prestored data according to the switching time sequence of the switching tube in the current detection, determine the current direction of each phase in the normal state, and use the prestored data as the reference current direction, if the obtained current direction of each phase is consistent with the reference current direction, the switching time sequence of the switching tube is considered to be matched with the current direction of each phase, otherwise, the switching time sequence of the switching tube is considered to be not matched with the current direction, and the inverter unit fails.

Specifically, referring to fig. 5, an upper bridge switching tube of the first phase bridge arm is a switching tube Q1, and a lower bridge switching tube is a switching tube Q4; the upper bridge switching tube of the second-phase bridge arm is a switching tube Q2, and the lower bridge switching tube is a switching tube Q5; the upper bridge switching tube of the third phase bridge arm is a switching tube Q3, and the lower bridge switching tube is a switching tube Q6. When the controller controls the switching tubes Q1, Q5 and Q6 to be conducted and controls the switching tubes Q2, Q3 and Q4 to be turned off, when the inversion unit works normally, the current flows out of the switching tube Q1, and returns through the switching tube Q5 and the switching tube Q6 after reaching the motor winding, at the moment, if the phase current Ia is detected to be positive and the phase current Ib and the phase current Ic are detected to be negative, the switching time sequence is determined to be matched with the three-phase current direction, otherwise, the switching time sequence is determined to be not matched.

Specifically, referring to fig. 5, when the controller 50 controls the switching transistors Q2, Q4, and Q6 to be turned on and the switching transistors Q1, Q3, and Q5 to be turned off, if the inverter unit operates normally, the current direction is to flow out of the switching transistor Q2, and after reaching the motor winding, the current returns through the switching transistor Q4 and the switching transistor Q6, and at this time, if the phase current Ib is detected to be positive and the phase current Ia and the phase current Ic to be negative, the switching timing is determined to be matched with the three-phase current direction, otherwise, the switching timing is determined to be not matched.

Specifically, as shown in fig. 5, when the controller controls the switching transistors Q3, Q4 and Q5 to be turned on and the switching transistors Q1, Q2 and Q6 to be turned off, if the inverter unit is operating normally, the current direction is to flow out of the switching transistor Q3, and after reaching the motor winding, the current returns through the switching transistor Q4 and the switching transistor Q5, at this time, if the phase current Ib is detected to be positive and the phase current Ia and the phase current Ic to be negative, the switching timing is determined to be matched with the three-phase current direction, otherwise, the switching timing is determined to be not matched.

In summary, the fault detection result of the inverter unit according to the switching time sequence of the switching tube in the inverter unit and the output current direction of the inverter unit can be determined by referring to the following table 1.

TABLE 1

As a specific embodiment of the present application, as shown in fig. 6, the fault detection method of the driving circuit may include the following steps:

s101, receiving a fault detection instruction.

S102, controlling a power switch tube in the PFC unit to alternately work, and obtaining the change trend of the inductance current of the PFC unit.

S103, judging whether the inductance current is increased when the power switch tube is turned on and is reduced when the power switch tube is turned off. If yes, go to step S104; if not, step S105 is performed.

And S104, determining that the PFC unit has no fault. Step S106 is performed.

S105, determining that the PFC unit fails, and reporting the PFC unit to detect the failure.

S106, controlling the upper bridge switching tube and the lower bridge switching tube of the first inversion unit to conduct or switch off according to a given switching time sequence, and determining the current direction of each phase output by the first inversion unit.

S107, judging whether the given switch time sequence is matched with the current direction of each phase. If yes, go to step S108. If not, step S109 is executed.

S108, controlling an upper bridge switching tube and a lower bridge switching tube in the second inversion unit to conduct or switch off according to a given switching time sequence, and determining the current direction of each phase output by the second inversion unit. Step S110 is performed.

S109, determining that the first inversion unit fails, and reporting a fault signal detected by the first inversion unit.

S110, judging whether the given switch time sequence is matched with the current direction of each phase. If yes, go to step S111. If not, go to step S112.

S111, determining that the driving circuit is good.

S112, determining that the second inversion unit fails, and reporting a fault signal detected by the second inversion unit.

After determining that the PFC unit has failed in step S105, the following failure detection operations for the first inverter unit and the second inverter unit may be continued. In addition, the fault detection of the first inverter unit and the fault detection of the second inverter unit may be performed simultaneously or stepwise, and since the PFC unit supplies power to the first inverter unit and the second inverter unit separately, the fault detection between the first inverter unit and the second inverter unit does not affect each other, and thus, when the fault of the first inverter unit is determined, the fault detection operation of the second inverter unit may be continued.

In summary, according to the fault detection method of the driving circuit of the embodiment of the invention, the driving circuit comprises a rectifying unit, a PFC unit and at least one inversion unit which are integrated on the same power IC. Therefore, the method can detect faults of the PFC unit in the highly integrated power IC according to the change trend of the inductance current, and detect faults of the inversion unit in the highly integrated power IC according to the switching time sequence of the switching tube in the inversion unit and the output current direction of the inversion unit, so that accurate fault positioning of the highly integrated power IC is realized, and faults of all components in the highly integrated power IC can be detected rapidly.

Corresponding to the embodiment, the invention also provides an electric control board.

As shown in fig. 7, the electronic control board 100 according to the embodiment of the present invention includes a memory 110, a processor 120, and a fault detection program of a driving circuit stored in the memory 110 and capable of running on the processor 120, where the fault detection method of the driving circuit is implemented when the processor 120 executes the fault detection program of the driving circuit.

The present invention also proposes a computer-readable storage medium corresponding to the above-described embodiments.

A computer-readable storage medium of an embodiment of the present invention stores thereon a failure detection program of a driving circuit, which when executed by a processor, implements the above-described failure detection method of the driving circuit.

Corresponding to the embodiment, the invention also provides a fault detection device of the driving circuit.

In one embodiment of the invention, the drive circuit comprises a rectifying unit, a PFC unit and at least one inverting unit integrated on the same power IC,

as shown in fig. 8, the fault detection device of the driving circuit according to the embodiment of the present invention may include: a current detection unit 60 and a control unit 70.

The current detection unit 60 is configured to detect an inductance current of the PFC unit and an output current of each inverter unit, respectively. The control unit 70 is configured to control the power switching tubes in the PFC unit to perform alternating operation, determine an inductance current variation trend according to an inductance current of the PFC unit, perform fault detection on the PFC unit according to the inductance current variation trend, and perform fault detection on each of the inverter units in sequence according to a switching timing of the switching tubes in the inverter units and an output current direction of the inverter units.

Corresponding to the embodiment, the invention also provides an electrical device.

As shown in fig. 9, the electrical device 200 according to an embodiment of the present invention may include: a drive circuit 210 and a fault detection device 220 for the drive circuit.

The driving circuit 210 includes a rectifying unit, a PFC unit, and at least one inverting unit integrated on the same power IC. The fault detection device 220 of the driving circuit is used for sequentially performing fault detection on the PFC unit and each inverter unit.

It should be noted that the logic and/or steps represented in the flowcharts or otherwise described herein, for example, may be considered as a ordered listing of executable instructions for implementing logical functions, and may be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.

It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," 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 present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims

1. A fault detection method for a driving circuit, wherein the driving circuit includes a rectifying unit, a PFC unit, and at least one inverting unit integrated on the same power IC, the method comprising:

controlling a power switch tube in the PFC unit to alternately work, acquiring the inductance current change trend of the PFC unit, and detecting faults of the PFC unit according to the inductance current change trend;

and sequentially carrying out fault detection on each inversion unit according to the switching time sequence of a switching tube in the inversion unit and the output current direction of the inversion unit.

2. The method of claim 1, wherein fault detection of the PFC unit according to the inductor current trend comprises:

and if the inductance current is determined to be increased when the power switch tube is turned on and is reduced when the power switch tube is turned off according to the inductance current change trend, determining that the PFC unit has no fault, otherwise, determining that the PFC unit has fault.

3. The method according to claim 1 or 2, wherein the fault detection of each of the inverter units in turn according to the switching timing of the switching tube in the inverter unit and the output current direction of the inverter unit comprises:

the method comprises the steps of controlling an upper bridge switching tube and a lower bridge switching tube of a current inversion unit to conduct or switch off according to a given switching time sequence, and determining the current direction of each phase output by the inversion unit;

and if the given switch time sequence is matched with the current direction of each phase, determining that the current inversion unit has no fault, otherwise, determining that the current inversion unit has fault.

4. The method of claim 3, wherein the given switching timing is determined to match the current direction of each phase if the current of the first phase of the current inverter unit is positive, the current of the second phase of the current inverter unit is negative, and the current of the third phase of the current inverter unit is negative when the upper switching tube of the first phase of the bridge arm, the lower switching tube of the second phase of the bridge arm, and the lower switching tube of the third phase of the bridge arm are on, and the lower switching tube of the first phase of the bridge arm, the upper switching tube of the second phase of the bridge arm, and the upper switching tube of the third phase of the bridge arm are off.

5. The method of claim 3, wherein the given switching sequence is determined to match the current direction of each phase if the current of the current inverter unit is negative, the current of the second phase is positive, and the current of the third phase is negative when the lower switching tube of the first phase leg, the upper switching tube of the second phase leg, and the lower switching tube of the third phase leg are on, and the upper switching tube of the first phase leg, the lower switching tube of the second phase leg, and the upper switching tube of the third phase leg are off in the current inverter unit.

6. The method of claim 3, wherein when the lower switching tube of the first phase bridge arm, the lower switching tube of the second phase bridge arm, and the upper switching tube of the third phase bridge arm are turned on, and the upper switching tube of the first phase bridge arm, the upper switching tube of the second phase bridge arm, and the lower switching tube of the third phase bridge arm are turned off in the current inverter unit, if the first phase current and the second phase current of the current inverter unit are negative, and the third phase current is positive, the given switching timing is determined to match the current direction of each phase.

7. An electronic control board, characterized by comprising a memory, a processor and a fault detection program of a driving circuit stored on the memory and operable on the processor, wherein the processor implements the fault detection method of the driving circuit according to any one of claims 1-6 when executing the fault detection program of the driving circuit.

8. A computer-readable storage medium, characterized in that a failure detection program of a drive circuit is stored thereon, which when executed by a processor implements the failure detection method of a drive circuit according to any one of claims 1-6.

9. A fault detection device for a driving circuit, wherein the driving circuit includes a rectifying unit, a PFC unit, and at least one inverting unit integrated on the same power IC, the fault detection device comprising:

a current detection unit for respectively detecting an inductance current of the PFC unit and an output current of each of the inverter units;

the control unit is used for controlling the power switching tubes in the PFC unit to alternately work, determining the change trend of the inductance current according to the inductance current of the PFC unit, detecting faults of the PFC unit according to the change trend of the inductance current, and sequentially detecting faults of each inversion unit according to the switching time sequence of the switching tubes in the inversion unit and the output current direction of the inversion unit.

10. An electrical device, comprising:

the driving circuit comprises a rectifying unit, a PFC unit and at least one inversion unit which are integrated on the same power IC;

the fault detection device of claim 9, configured to perform fault detection on the PFC unit and each of the inverter units in sequence.