CN113726146A - PFC circuit control device and method and electronic equipment - Google Patents

PFC circuit control device and method and electronic equipment Download PDF

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Publication number
CN113726146A
CN113726146A CN202111010638.XA CN202111010638A CN113726146A CN 113726146 A CN113726146 A CN 113726146A CN 202111010638 A CN202111010638 A CN 202111010638A CN 113726146 A CN113726146 A CN 113726146A
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China
Prior art keywords
pfc circuit
pfc
circuit
module
control
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Granted
Application number
CN202111010638.XA
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Chinese (zh)
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CN113726146B (en
Inventor
汪洋
马嘉林
何磊
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Aux Air Conditioning Co Ltd
Ningbo Aux Electric Co Ltd
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Aux Air Conditioning Co Ltd
Ningbo Aux Electric Co Ltd
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Application filed by Aux Air Conditioning Co Ltd, Ningbo Aux Electric Co Ltd filed Critical Aux Air Conditioning Co Ltd
Priority to CN202111010638.XA priority Critical patent/CN113726146B/en
Priority claimed from CN202111010638.XA external-priority patent/CN113726146B/en
Publication of CN113726146A publication Critical patent/CN113726146A/en
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Publication of CN113726146B publication Critical patent/CN113726146B/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

The invention provides a PFC circuit control device, a PFC circuit control method and electronic equipment, and relates to the technical field of power supplies. In a possible implementation manner, the control module may further be used to send out a prompt message to notify the user that the first failure occurs, so that the PFC circuit can be maintained to continue to operate on the one hand when the first switching tube fails, and on the other hand, a failure prompt may be sent out to prompt the user to remove the failure.

Description

PFC circuit control device and method and electronic equipment
Technical Field
The invention relates to the technical field of power supplies, in particular to a PFC circuit control device and method and electronic equipment.
Background
The existing air conditioner is often short-circuited by a switching tube such as an Insulated Gate Bipolar Transistor (IGBT) in a Power Factor Correction (PFC) circuit after sale, so that the air conditioner cannot operate, user experience is influenced, in addition, the air conditioner controller with the IGBT fault is disassembled and analyzed, most of the IGBT is damaged, other components are not problematic, and the air conditioner can normally operate after the qualified IGBT is replaced.
However, the existing air conditioner cannot judge whether the IGBT fails, no obvious fault prompt is used for distinguishing when the IGBT fails and other components fail, and the air conditioner cannot operate when the IGBT fails.
Disclosure of Invention
The invention solves the problems that the operation of the existing equipment such as an air conditioner and the like can be influenced under the condition that the IGBT fails, and the failure reason can be confirmed only by disassembling the air conditioner.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
in a first aspect, the present invention provides a PFC circuit control apparatus, including:
the device comprises a PFC switch module, a sampling module, a control module and a PFC on-off module;
the PFC switch module comprises a first switch tube, the PFC on-off module comprises a control end and a switch circuit, the control end is connected with the control module, the switch circuit is connected with the first switch tube in series, and the switch circuit is used for switching to a conducting state or a disconnecting state according to a control signal received by the control end;
the sampling module is connected with the power input of the PFC circuit to sample the current of the PFC circuit, and is also connected with the control module to send the current of the PFC circuit to the control module;
the control module determines whether the first switching tube has a fault according to the current of the PFC circuit, and when the first switching tube is determined to have the fault, the control module sends a control signal to a control end of the PFC on-off module so as to control the switching circuit to be switched off.
According to the PFC circuit control device provided by the embodiment of the invention, under the condition that the first switch tube of the PFC switch module has a fault, the PFC on-off module is used for disconnecting the first switch tube, so that a loop where the first switch tube is located is cut off, the phenomenon that the PFC circuit cannot run due to the fault of the first switch tube or the PFC switch module is avoided, and the PFC circuit is enabled to maintain the working state in a passive mode.
In an alternative embodiment, the PFC switching module comprises a relay and a second switching tube, the relay comprises a coil and a contact switch, the contact switch forms the switching circuit and is connected in series with the first switching tube; the first end of the coil is connected with a 12V direct-current power supply, the second end of the coil is grounded through a second switch tube, and the base of the second switch tube forms a control end of the PFC on-off module and is connected with the control module.
In an optional embodiment, the PFC circuit control apparatus further includes a PWM switching module;
the control module is used for starting timing when the current of the PFC circuit is determined to be larger than an overcurrent threshold value, and determining the overcurrent operation of the PFC circuit if the current of the PFC circuit is larger than the overcurrent threshold value and smaller than a short-circuit current threshold value after a first preset time period;
and when the PFC circuit is determined to be in overcurrent operation, the control module controls the PWM switching module to be switched off.
In an optional embodiment, the control module is configured to determine that the first switching tube is faulty when the current of the PFC circuit is greater than a short-circuit current threshold; the control module sends a control signal to the control end of the PFC on-off module to control the switch circuit to be switched off so that the PFC circuit works in a passive mode.
In an optional embodiment, the contact switch is a normally open contact, and after the PFC circuit is started, the control module sends a control signal to the control terminal, and the switch circuit is turned on to connect the PFC switch module to the PFC circuit.
In a second aspect, the present invention provides a PFC circuit control method applied to the PFC circuit control apparatus according to any one of the preceding embodiments, the PFC circuit control method including:
acquiring the current of a PFC circuit;
determining the operation state of the PFC circuit according to the current of the PFC circuit;
and when the operating state of the PFC circuit is determined to be the condition that the first switching tube has a fault, controlling the switching circuit to be switched off so that the PFC circuit works in a passive mode.
In an optional embodiment, after determining the operating state of the PFC circuit according to the current of the PFC circuit, the method further includes:
and controlling the PWM switching module of the PFC circuit to be switched off under the condition that the operation state of the PFC circuit is determined to be an overcurrent operation state.
In an optional embodiment, the step of determining the operating state of the PFC circuit according to the current of the PFC circuit includes:
and when the current of the PFC circuit is larger than the short-circuit current threshold value, determining that the running state of the PFC circuit is that the first switching tube has a fault.
In an optional embodiment, the step of determining the operating state of the PFC circuit according to the current of the PFC circuit includes:
and starting timing when the current of the PFC circuit is determined to be larger than the overcurrent threshold, and determining that the operation state of the PFC circuit is the overcurrent operation state if the current of the PFC circuit is larger than the overcurrent threshold and smaller than the short-circuit current threshold after a first preset time period.
In a third aspect, the present invention provides an electronic device comprising the PFC circuit control apparatus according to any one of the preceding embodiments.
Drawings
Fig. 1 is a schematic diagram of a PFC circuit control apparatus according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a PFC circuit control method according to an embodiment of the present invention;
fig. 3 is a schematic diagram of another PFC circuit control method according to an embodiment of the present invention;
fig. 4 is a schematic diagram of another PFC circuit control method according to an embodiment of the present invention.
Description of reference numerals:
100-PFC circuit control means; 110-a PFC switch module; q1-first switch tube; l1-inductance; d1-diode; 120-PFC on-off module; RY 1-relay; q2-second switch tube; r2-voltage dividing resistor; 130-a PWM switching module; 140-a sampling module; 141-a current sampling unit; r1-sample resistance; 150-a control module; BG 1-rectifier module; e1-bus capacitance.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
The existing air conditioner is often short-circuited by the IGBT in the PFC circuit after sale, so that the air conditioner cannot run and user experience is influenced. Therefore, the IGBT breaks down to cause the air conditioner to be incapable of running, and on the other hand, the reason of the fault cannot be known before the air conditioner is disassembled, so that manpower and material resources are wasted to maintain the air conditioner, and the use experience of a user is reduced.
In view of the above, the present invention provides a PFC circuit control apparatus 100, so that the PFC circuit can maintain operation even when the IGBT fails.
Referring to fig. 1, fig. 1 shows a schematic diagram of a PFC circuit control apparatus 100 according to the present embodiment, in which the PFC circuit control apparatus 100 includes a PFC circuit (not shown), a sampling module 140, a control module 150, and a PFC on-off module 120, the PFC circuit includes a rectification module BG1, a PFC switch module 110, a bus capacitor E1, and a PWM switch module 130, and the rectification module BG1, the PFC switch module 110, the bus capacitor E1, and the PWM switch module 130 are sequentially connected.
The rectifier module BG1 includes a positive output and a negative output, the PFC switch module 110 includes an inductor L1, a diode D1, and a first switch tube Q1, wherein a first end L1_1 of the inductor L1 is connected to the positive output of the rectifier module BG1, a second end L1_ of the inductor L1 is connected to one end of the PFC switch module 110 through a diode D1, the first switch tube Q1 is connected between the inductor L1 and the negative electrode of the rectifier module BG1, the other end of the PFC switch module 110 is connected to the negative output of the rectifier module BG1 and grounded, and a bus capacitor E1 is connected to both ends of the PFC switch module 110.
The PFC switch module 110 includes a first switch tube Q1, the PFC on-off module 120 includes a control end and a switch circuit, the control end is connected to the control module 150, the switch circuit and the first switch tube Q1 are connected in series between the positive and negative outputs of the rectifier module BG1, in this embodiment, the switch circuit and the first switch tube Q1 are connected in series between the second end of the inductor L1 and the negative output of the rectifier module BG1, the switch circuit is configured to switch to an on or off state according to a control signal received by the control end, when the switch circuit is turned on, the first switch tube Q1 is connected to the PFC circuit, and the PFC circuit can operate in an active mode; when the switch circuit is opened, the first switch tube Q1 is disconnected, and the PFC circuit operates in the passive mode.
The sampling module 140 is connected to a power input of the PFC circuit to sample a current of the PFC circuit, and in a possible implementation manner, the sampling module 140 is connected to a positive output or a negative output of a rectifying module BG1 of the PFC circuit to obtain the current of the PFC circuit, and the sampling module 140 is further connected to the control module 150 to send the obtained current of the PFC circuit to the control module 150.
The control module 150 determines an operation state of the PFC circuit according to the current of the PFC circuit obtained by the sampling module 140, for example, whether the PFC circuit operates in an overcurrent state or whether the first switching tube Q1 fails, and when it is determined that the first switching tube Q1 fails, the control module 150 sends a control signal to the control terminal of the PFC on-off module 120 to control the switching circuit to be turned off, so as to disconnect the failed first switching tube Q1 from the PFC circuit, so that the PFC circuit operates in a passive mode, thereby avoiding affecting the operation stop of the PFC circuit.
In the PFC circuit control apparatus 100 according to the embodiment of the present invention, when the first switching tube Q1 of the PFC switch module 110 has a fault, the PFC switching module 120 is used to disconnect the first switching tube Q1, and cut off the loop where the first switching tube Q1 is located, so that the PFC circuit maintains a working state in a passive mode, thereby preventing the PFC circuit from being unable to operate due to the fault of the first switching tube Q1 or the PFC switch module 110. In a possible implementation manner, the control module 150 may further be used to send a prompt message to notify the user of the first failure, so that the PFC circuit can be maintained to continue to operate in the case that the first switching tube Q1 fails, and a failure prompt may be sent to notify the user of the failure.
In the scheme provided by this embodiment, the sampling module 140 is used to obtain the current of the PFC circuit, and when it is determined that the first switching tube Q1 has a fault according to the current, the PFC switching module 120 is used to switch off the loop in which the first switching tube Q1 is located, which will be described as an example in the following for a possible implementation manner of the PFC switching module 120.
In some possible implementations, PFC switching module 120 includes a relay RY1 and a second switching tube Q2, where relay RY1 includes a coil and a contact switch, the contact switch is a normally open contact, the contact switch is closed and conducted when the coil is energized, and the contact switch is opened when the coil is de-energized.
The first end of the coil is connected to a dc power source, for example, a 12V dc power source, the second end of the coil is grounded through a second switching tube Q2, the control end of the second switching tube Q2 forms the control end of the PFC on-off module 120, and is connected to the control module 150 (in this embodiment, connected to the SHORT-CTRL port of the control module 150), the control module 150 sends a control signal to the control end of the PFC on-off module 120, that is, the control end of the second switching tube Q2, so that the second switching tube Q2 switches the on state, when the second switching tube Q2 is turned on, the coil is powered on, the contact switch is turned on, the first switching tube Q1 is connected to the PFC circuit, and when the second switching tube Q2 is turned off, the coil is powered off, the contact switch is turned off, and the first switching tube Q1 is disconnected.
The contact switch forms a switch circuit and is connected with the first switch tube Q1 in series, when the coil is electrified and the contact switch is closed, the first switch tube Q1 is connected into the PFC circuit, and when the coil is deenergized and the contact switch is disconnected, the first switch tube Q1 is disconnected.
In a possible implementation manner, the second switching tube Q2 may be a triode, the triode includes a base, an emitter, and a collector, the base of the second switching tube Q2 may be connected to the control module 150 as a control terminal, the emitter is grounded, the collector is connected to the second end of the coil, and the second switching tube Q2 may also be another switching tube, such as a field effect transistor.
The control terminal of the second switch Q2 may be provided with a voltage dividing resistor R2 to avoid the damage to the second switch Q2 due to the excessive voltage or current of the control signal.
The sampling module 140 includes a sampling resistor R1 and a current sampling unit 141, the sampling resistor R1 is disposed at the positive output or the negative output of the rectifier module BG1, two input terminals of the current sampling unit 141 are respectively disposed at two ends of the sampling resistor R1, so as to sample the current flowing through the sampling resistor R1, and the current sampling unit 141 is connected to the control module 150.
In the embodiment of the application, three thresholds are set for the current of the PFC circuit, wherein one threshold is a starting current, namely the current when the PFC circuit normally runs; the second is an overcurrent current threshold value, namely the current of the PFC circuit in an overcurrent state; the third is a short-circuit current threshold, that is, a current when the PFC circuit is short-circuited, that is, when the first switching tube Q1 is short-circuited. It is understood that the turn-on current is less than the overcurrent current, which is less than the short circuit current.
The following illustrates how the control module 150 determines the operation state of the PFC circuit according to the current of the PFC circuit.
In a possible implementation manner, the control module 150 is configured to start timing when it is determined that the current of the PFC circuit is greater than the overcurrent threshold, and after a first preset time period, if the current of the PFC circuit is still greater than the overcurrent threshold and smaller than the short-circuit current threshold, the control module 150 determines that the PFC circuit is in an overcurrent operation.
That is, if the current of the PFC circuit lasts for the first preset duration longer than the overcurrent current threshold, it is determined that the PFC circuit operates in the overcurrent state. When the PFC circuit is operated in the overcurrent state, on one hand, the normal operation of the PFC circuit may be affected, and on the other hand, the PFC circuit may also cause damage to a rear-stage load, such as a compressor, a fan, and the like, and therefore, when it is determined that the PFC circuit is operated in the overcurrent state, the control module 150 outputs a corresponding PWM waveform to the PWM switching module 130 to turn off the PWM switching module 130, so that the rear-stage load of the PFC circuit, such as the compressor, the fan, and the like, stops working, and the rear-stage load of the compressor, the fan, and the like, is prevented from being damaged. At this time, the control module 150 sends fault information, taking an air conditioner as an example, the control module 150 may send the fault information to the indoor unit, and the display module of the indoor unit displays the fault information to prompt a user to remove the fault as soon as possible; or the fault information can be sent to the intelligent terminal of the user to prompt the user to remove the fault as soon as possible.
After the shutdown for a period of time, for example, 3 minutes, the control module 150 controls the PFC circuit to resume the working state, and performs sampling judgment on the current of the PFC circuit again.
In one possible implementation, the control module 150 is further configured to determine that the first switching tube Q1 is faulty when the current of the PFC circuit is greater than the short-circuit current threshold.
When the current of the PFC circuit is greater than the short-circuit current threshold, it may be determined that the PFC circuit is short-circuited, that is, the first switching tube Q1 has a short-circuit fault. In order to avoid the situation that the PFC circuit cannot operate due to a short-circuit fault of the first switching tube Q1 in the conventional PFC circuit, the PFC circuit control device 100 provided in the embodiment of the present application is provided with the PFC on-off module 120, and when it is determined that the first switching tube Q1 has the short-circuit fault, the control module 150 sends a control signal to a control terminal of the PFC on-off module 120 to control the switching circuit to be turned off, so as to disconnect the first switching tube Q1, so that the PFC circuit operates in the passive mode, thereby ensuring the operation of the PFC circuit even if the first switching tube Q1 has the fault.
When the first switching tube Q1 is disconnected, the PFC circuit operates in the passive mode, in which the power factor is low, but the operation state can still be maintained. At this time, the control module 150 sends fault information, taking an air conditioner as an example, the control module 150 may send the fault information to the indoor unit, and the display module of the indoor unit displays the fault information to prompt a user to remove the fault as soon as possible; or the fault information can be sent to an intelligent terminal of a user to prompt the user to remove the fault as soon as possible, so that the problem that the fault reason can be determined only by disassembling and maintaining the conventional PFC circuit when the first switching tube Q1 has a fault can be solved.
The following describes an example of the operation principle of the PFC circuit control apparatus 100 according to the embodiment of the present application.
The switch circuit of the PFC on/off module 120 is in a normally open state, and each module does not operate before the PFC circuit is started. After the PFC circuit is powered on, the bus capacitor E1 is charged, the voltage reaches the working condition of the PWM switch module 130, the control module 150 resets to work, at this time, the first control signal is output to the control end of the PFC on-off module 120, the second switch tube Q2 is turned on, the coil is powered on, and the switch circuit is turned on.
In the present embodiment, taking an IGBT as an example, the control terminal of the first switching tube Q1 is a gate (G) of the IGBT, and the gate of the IGBT is connected to the PFC-CTRL port of the control module 150. When the control module 150 determines that the current of the PFC circuit reaches the turn-on current, the control module 150 outputs a PFC-CTRL signal to control the on/off of the first switching tube Q1, so that the PFC circuit starts to operate.
The PWM switching module 130 is connected to the control module 150 (not shown), and in this embodiment, the PWM switching module 130 is connected to the PWM-CTRL port of the control module 150. In the working process of the PFC circuit, when the current of the PFC circuit acquired by the sampling module 140 is greater than the overcurrent threshold and less than the short-circuit current threshold, the control module 150 starts timing, determines the magnitude of the current of the PFC circuit again after a first preset time period of a set time, and determines that the PFC circuit is in an overcurrent operation state if the current of the PFC circuit is still greater than the overcurrent threshold and less than the short-circuit current threshold, in which case the control module 150 turns off the PWM switching module 130 by controlling a PWM signal (i.e., a PWM-CTRL signal), stops working of a rear-stage load such as a compressor or a fan, and resumes working of the PFC circuit and detects the PFC current again after 3 minutes.
In a possible implementation manner, the on-current may be measured in advance in an on state of the PFC, the short-circuit current threshold may be measured in advance in a case where a short-circuit fault occurs in the first switching tube Q1 of the PFC circuit, and the first preset time period may be determined by experimentally measuring a time when the PFC current rises from the on-current to the short-circuit current threshold when the first switching tube Q1 is short-circuited, and multiplying the time by a predetermined coefficient, where the predetermined coefficient may be 1.5.
In one possible implementation, the turn-on current is about 2A, the overcurrent current is less than 40A, and the short-circuit current is greater than 80A.
In the working process of the PFC circuit, when the current of the PFC circuit acquired by the sampling module 140 is greater than the short-circuit current threshold, it is determined that the PFC circuit is in a short-circuit state, that is, the first switching tube Q1 has a short-circuit fault, under such a condition, the control module 150 outputs a second control signal to the control end of the PFC on-off module 120, the second switching tube Q2 is turned off, the relay RY1 is turned off, the first switching tube Q1 is turned off, the PFC circuit continues to work in a passive mode, at this time, the power factor is low, and the control module 150 sends fault information to display a warning to a user to report or remove the fault as soon as possible.
The control module 150 includes a controller, which may be an Integrated Circuit chip having Signal Processing capability, for example, the controller may be a general-purpose processor including a Central Processing Unit (CPU), a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, and a single chip. The controller may also be a microprocessor or any conventional processor or the like.
Based on the PFC circuit control device 100 provided in the foregoing embodiment, an embodiment of the present application further provides a PFC circuit control method, and the PFC circuit control method is applied to the PFC circuit control device 100 provided in the foregoing embodiment. It should be noted that the technical effects and technical principles of the PFC circuit control method provided in the embodiment of the present application are substantially the same as those of the PFC circuit control apparatus 100 provided in the foregoing embodiment, and for brief description, the embodiment will not be described in detail, and the embodiment does not describe in detail, and please refer to relevant contents in the foregoing embodiment.
Referring to fig. 2, fig. 2 shows a schematic flow chart of a PFC circuit control method according to an embodiment of the present application, where the PFC circuit control method according to the embodiment of the present application includes steps S210 to S240.
S210: and acquiring the current of the PFC circuit.
In a possible implementation manner, the sampling module 140 samples and obtains a current of the PFC circuit, and sends the obtained current of the PFC circuit to the control module 150.
S220: and determining the operation state of the PFC circuit according to the current of the PFC circuit.
The control module 150 determines an operating state of the PFC circuit according to the current of the PFC circuit, where the operating state of the PFC circuit includes: a normal operating condition, an over-current operating condition, and a short circuit fault condition.
S230: and when the operating state of the PFC circuit is determined to be that the first switching tube Q1 has a fault, the switching circuit is controlled to be switched off, so that the PFC circuit works in a passive mode.
When the operating state of the PFC circuit is determined to be that the first switching tube Q1 has a fault, the switching circuit is controlled to be disconnected, the first switching tube Q1 is disconnected, and the PFC circuit keeps operating in a passive mode. Meanwhile, the control module 150 sends fault information, taking an air conditioner as an example, the control module 150 can send the fault information to the indoor unit, and the display module of the indoor unit displays the fault information to prompt a user to remove the fault as soon as possible; or the fault information can be sent to an intelligent terminal of a user to prompt the user to remove the fault as soon as possible, so that the problem that the fault reason can be determined only by disassembling and maintaining the conventional PFC circuit when the first switching tube Q1 has a fault can be solved.
In an alternative embodiment, referring to fig. 3, after determining the operating state of the PFC circuit according to the current of the PFC circuit, the method further includes:
s240: and controlling the PWM switching module 130 of the PFC circuit to be switched off under the condition that the operation state of the PFC circuit is determined to be an overcurrent operation state.
When it is determined that the PFC circuit operates in the over-current operation state, the control module 150 outputs a corresponding PWM waveform to the PWM switching module 130 to turn off the PWM switching module 130, so that the subsequent loads of the PFC circuit, such as the compressor, the fan, etc., stop working, and the subsequent loads of the compressor, the fan, etc., are prevented from being damaged. At this time, the control module 150 sends fault information, taking an air conditioner as an example, the control module 150 may send the fault information to the indoor unit, and the display module of the indoor unit displays the fault information to prompt a user to remove the fault as soon as possible; or the fault information can be sent to the intelligent terminal of the user to prompt the user to remove the fault as soon as possible.
In an alternative embodiment, referring to fig. 4, the step of determining the operating state of the PFC circuit according to the current of the PFC circuit includes:
s220-1: when the current of the PFC circuit is larger than the short-circuit current threshold value, the operation state of the PFC circuit is determined to be that the first switching tube Q1 has a fault.
S220-2: and starting timing when the current of the PFC circuit is determined to be larger than the overcurrent threshold, and determining that the operation state of the PFC circuit is the overcurrent operation state if the current of the PFC circuit is larger than the overcurrent threshold and smaller than the short-circuit current threshold after the first preset time.
Based on the PFC circuit control apparatus 100 provided in the foregoing embodiment, the present invention also provides an electronic device including the PFC circuit control apparatus 100 provided in the foregoing embodiment.
The electronic device may be an air conditioner, or any device that requires the use of a PFC circuit.
In summary, the present invention provides a PFC circuit control apparatus 100, a method and an electronic device, in which when a fault occurs in a first switch Q1 of a PFC switch module 110, the PFC switch module 120 is used to disconnect the first switch Q1 and cut off a loop in which the first switch Q1 is located, so that the PFC circuit maintains a working state in a passive mode, thereby preventing the PFC circuit from failing to operate due to the fault of the first switch Q1 or the PFC switch module 110. In a possible implementation manner, the control module 150 may further be used to send a prompt message to notify the user of the first failure, so that the PFC circuit can be maintained to continue to operate in the case that the first switching tube Q1 fails, and a failure prompt may be sent to notify the user of the failure.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. A PFC circuit control device (100), characterized by comprising:
the device comprises a PFC switch module (110), a sampling module (140), a control module (150) and a PFC on-off module (120);
the PFC switch module (110) comprises a first switch tube (Q1), the PFC on-off module (120) comprises a control end and a switch circuit, the control end is connected with the control module (150), the switch circuit is connected with the first switch tube (Q1) in series, and the switch circuit is used for being switched to a conducting state or a disconnecting state according to a control signal received by the control end;
the sampling module (140) is connected with a power supply input of the PFC circuit to sample the current of the PFC circuit, and the sampling module (140) is also connected with the control module (150) to send the current of the PFC circuit to the control module (150);
the control module (150) determines whether the first switching tube (Q1) has a fault according to the current of the PFC circuit, and when the first switching tube (Q1) has the fault, the control module (150) sends a control signal to a control end of the PFC on-off module (120) to control the switching circuit to be switched off.
2. The PFC circuit control device (100) according to claim 1, characterized in that the PFC switching module (120) comprises a relay (RY1) and a second switching tube (Q2), the relay (RY1) comprising a coil and a contact switch forming the switching circuit, in series with the first switching tube (Q1); the first end of the coil is connected with a 12V direct-current power supply, the second end of the coil is grounded through a second switching tube (Q2), and the base electrode of the second switching tube (Q2) forms the control end of the PFC on-off module (120) and is connected with the control module (150).
3. The PFC circuit control device (100) according to claim 1, wherein the PFC circuit control device (100) further comprises a PWM switching module (130);
the control module (150) is used for starting timing when the current of the PFC circuit is determined to be larger than an overcurrent threshold value, and after a first preset time period, if the current of the PFC circuit is larger than the overcurrent threshold value and smaller than a short-circuit current threshold value, the control module (150) determines that the PFC circuit is in overcurrent operation;
when the PFC circuit is determined to be in overcurrent operation, the control module (150) controls the PWM switching module (130) to be turned off.
4. The PFC circuit control apparatus (100) of claim 1, wherein the control module (150) is configured to determine that the first switching tube (Q1) is faulty when the current of the PFC circuit is greater than a short circuit current threshold; the control module (150) sends a control signal to the control end of the PFC on-off module (120) to control the switching circuit to be switched off so that the PFC circuit works in a passive mode.
5. The PFC circuit control device (100) of claim 2, wherein the contact switch is a normally open contact, and when the PFC circuit is started, the control module (150) sends a control signal to the control terminal, and the switch circuit is turned on to connect the PFC switch module (110) to the PFC circuit.
6. A PFC circuit control method applied to the PFC circuit control apparatus (100) according to any one of claims 1 to 5, the PFC circuit control method comprising:
acquiring the current of a PFC circuit;
determining the operation state of the PFC circuit according to the current of the PFC circuit;
when the operating state of the PFC circuit is determined to be that the first switching tube (Q1) has a fault, the switching circuit is controlled to be switched off, so that the PFC circuit works in a passive mode.
7. The PFC circuit control method of claim 6, further comprising, after determining the operating state of the PFC circuit based on the current of the PFC circuit:
and controlling a PWM (pulse width modulation) switching module (130) of the PFC circuit to be switched off under the condition that the operation state of the PFC circuit is determined to be an overcurrent operation state.
8. The PFC circuit control method of claim 6, wherein the step of determining the operating state of the PFC circuit from the current of the PFC circuit comprises:
when the current of the PFC circuit is larger than the short-circuit current threshold value, the operation state of the PFC circuit is determined to be that the first switching tube (Q1) has a fault.
9. The PFC circuit control method of claim 6, wherein the step of determining the operating state of the PFC circuit from the current of the PFC circuit comprises:
and starting timing when the current of the PFC circuit is determined to be larger than the overcurrent threshold, and determining that the operation state of the PFC circuit is the overcurrent operation state if the current of the PFC circuit is larger than the overcurrent threshold and smaller than the short-circuit current threshold after the first preset time.
10. An electronic device, characterized in that it comprises a PFC circuit control device (100) according to any of claims 1 to 5.
CN202111010638.XA 2021-08-31 PFC circuit control device and method and electronic equipment Active CN113726146B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111010638.XA CN113726146B (en) 2021-08-31 PFC circuit control device and method and electronic equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111010638.XA CN113726146B (en) 2021-08-31 PFC circuit control device and method and electronic equipment

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CN113726146A true CN113726146A (en) 2021-11-30
CN113726146B CN113726146B (en) 2024-05-10

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109525107A (en) * 2018-12-29 2019-03-26 浙江鲲悟科技有限公司 A kind of PFC control and protection circuit
JP2020108245A (en) * 2018-12-27 2020-07-09 トヨタ自動車株式会社 Abnormality detection system and vehicle including the same, and abnormality detection method
CN113285587A (en) * 2021-05-06 2021-08-20 珠海格力电器股份有限公司 Protection device of PFC circuit, control method thereof and motor system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020108245A (en) * 2018-12-27 2020-07-09 トヨタ自動車株式会社 Abnormality detection system and vehicle including the same, and abnormality detection method
CN109525107A (en) * 2018-12-29 2019-03-26 浙江鲲悟科技有限公司 A kind of PFC control and protection circuit
CN113285587A (en) * 2021-05-06 2021-08-20 珠海格力电器股份有限公司 Protection device of PFC circuit, control method thereof and motor system

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