CN113183779A - Vehicle-mounted charger and charging method thereof - Google Patents

Vehicle-mounted charger and charging method thereof Download PDF

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Publication number
CN113183779A
CN113183779A CN202110434957.7A CN202110434957A CN113183779A CN 113183779 A CN113183779 A CN 113183779A CN 202110434957 A CN202110434957 A CN 202110434957A CN 113183779 A CN113183779 A CN 113183779A
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signal
module
latch
overcurrent
pfc
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CN113183779B (en
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李生超
纪晓泳
施向前
张攀
唐志俊
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United Automotive Electronic Systems Co Ltd
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United Automotive Electronic Systems Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/60—Monitoring or controlling charging stations
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/12—Electric charging stations
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles

Abstract

The invention provides a vehicle-mounted charger and a charging method thereof, wherein the charging method of the vehicle-mounted charger comprises the following steps: capturing an input signal through a latch module and a control module; when the input signal comprises an overcurrent signal, the control module performs software diagnosis on the overcurrent signal so as to identify the lightning surge working condition and output a reset signal; the latching module resets parameters of the vehicle-mounted charger according to the reset signal so that the PFC driving module and the DCDC driving module output PFC driving signals and DCDC driving signals; and driving the PFC module and the DCDC module to work through the PFC driving signal and the DCDC driving signal. The charging method of the vehicle-mounted charger can realize the recognition of the lightning surge working condition and the non-lightning surge working condition, and the vehicle-mounted charger can continuously charge the power battery under the lightning surge working condition and the non-lightning surge working condition.

Description

Vehicle-mounted charger and charging method thereof
Technical Field
The invention relates to the technical field of automobiles, in particular to a vehicle-mounted charger and a charging method thereof.
Background
Along with the rapid development and the more extensive popularization of new energy automobile, more and more electric automobile or hybrid vehicle appear in ordinary consumer's life, on-vehicle machine that charges is the indispensable constitutional part of electric automobile/hybrid vehicle, on-vehicle machine that charges converts the alternating current signal of electric wire netting into direct current signal and charges for power battery, but under some thunderstorm weather (the thunderbolt surge operating mode promptly), probably lead to on-vehicle machine that charges can't charge for power battery, or lead to the interruption of charging, influence the use of electric motor car, consequently, need carry out special treatment to this kind of operating mode of thunderbolt surge, with satisfy relevant legislation requirement, promote the adaptability of charging of on-vehicle machine.
When the alternating current input side of the vehicle-mounted charger is subjected to lightning surge, a huge amount of energy is injected into the alternating current side to cause input overcurrent, so that the charging is interrupted due to triggering protection, and the charging cannot be finished.
In order to enable the vehicle-mounted charger to continue charging after the lightning surge is ended, when the overcurrent is input and the overcurrent signal is captured, the driving of the PFC module is blocked, the latch signal is reset, the later stage DCDC continues to maintain work during the period, and the driving of the PFC module is recovered after the lightning surge is ended, so that the vehicle-mounted charger continues charging, but the scheme has the following problems:
firstly, the method comprises the following steps: according to the scheme, the latch is continuously reset after an input overcurrent latch signal is detected, and secondary overcurrent is easily caused during restarting;
secondly, the method comprises the following steps: lightning surge and real input overcurrent are not distinguished, so that the PFC has the condition of entering dead circulation of overcurrent and restart, and the PFC can be damaged after a long time.
Disclosure of Invention
The invention aims to provide a vehicle-mounted charger and a charging method thereof, so as to realize the recognition of the lightning surge working condition, and the vehicle-mounted charger can continuously output in the lightning surge period, thereby avoiding the interruption or stop of charging.
In order to achieve the above and other related objects, the present invention provides a charging method for a vehicle-mounted charger, including:
step S1: capturing an input signal through a latch module and a control module;
step S2: when the input signal does not include the abnormal signal, the control module outputs a driving control signal to enable the PFC driving module and the DCDC driving module to output the PFC driving signal and the DCDC driving signal, and performs step S4; when the input signal comprises an abnormal signal and the abnormal signal comprises an overcurrent signal, the latch module outputs a latch signal, the control module performs software diagnosis on the overcurrent signal, and performs identification of lightning surge working conditions and output of a reset signal according to a software diagnosis result;
step S3: receiving the reset signal through the latch module, and resetting the parameters of the vehicle-mounted charger according to the reset signal so that the PFC driving module and the DCDC driving module output a PFC driving signal and a DCDC driving signal according to the driving control signal;
step S4: and driving the PFC module and the DCDC module to work through the PFC driving signal and the DCDC driving signal, so as to realize charging of the vehicle-mounted charger.
Optionally, in the charging method of the vehicle-mounted charger, in step S2, the method further includes: when the input signal comprises an abnormal signal and the abnormal signal comprises a fault signal, the latch module outputs a latch signal and the control module outputs a reset signal.
Optionally, in the charging method of the vehicle-mounted charger, the latch module includes an overcurrent latch module and a fault latch module, and when the input signal includes an overcurrent signal, the overcurrent latch module outputs a PFC OCP latch signal; when the input signal contains a fault signal, the fault latch module outputs a fault latch signal.
Optionally, in the charging method of the vehicle-mounted charger, in step S2, the process of performing software diagnosis on the overcurrent signal by the control module includes: and detecting the overcurrent times and each overcurrent time in the overcurrent time window, comparing the overcurrent times with the limited times and each overcurrent time with the limited time, and identifying the lightning surge working condition according to the comparison result.
Optionally, in the charging method of the vehicle-mounted charger, when the overcurrent times in the overcurrent time window exceed a limited number of times, and/or when each overcurrent time exceeds a limited time, the control module identifies a non-lightning surge condition, and the control module outputs a fault reset signal;
when the number of overcurrent times in the overcurrent time window does not exceed the limit number and each time the overcurrent time does not exceed the limit time, the control module outputs the PFC OCP reset signal, and after step S4, the method further includes:
step S5: and detecting the overcurrent times and each overcurrent time within the set time through the control module, comparing the overcurrent times with the set times and each overcurrent time with the set time, and identifying the lightning surge working condition according to the comparison result.
Optionally, in the charging method of the vehicle-mounted charger, in step S5,
when the overcurrent times in the set time do not exceed the set times and the overcurrent time does not exceed the set time each time, the control module identifies the lightning surge working condition and returns to the step S1;
and when the overcurrent times in the set time exceed the set times, and/or when the overcurrent time exceeds the set time each time, the control module identifies the non-lightning surge working condition and outputs a fault reset signal.
Optionally, in the charging method of the vehicle-mounted charger, the overcurrent signal includes an alternating current overcurrent signal.
Optionally, in the charging method of the vehicle-mounted charger, the fault signal includes at least one of an overcurrent signal output by the vehicle-mounted charger, an overvoltage signal output by the vehicle-mounted charger, and a capacitor overvoltage signal.
In order to achieve the above and other related objects, the present invention further provides a vehicle-mounted charger, including a latch module, a control module, a PFC driving module, a PFC module, a DCDC module, and a DCDC driving module, wherein,
the input end of the control module is used for capturing an input signal, and when the input signal does not contain an abnormal signal, the control module outputs a driving control signal so that the PFC driving module and the DCDC driving module output a PFC driving signal and a DCDC driving signal; when the input signal comprises an abnormal signal and the abnormal signal comprises an overcurrent signal, the control module performs software diagnosis on the overcurrent signal, and performs identification of lightning surge conditions and output of a reset signal according to the software diagnosis result;
the first input end of the latch module is used for capturing an input signal, the second input end of the latch module is respectively and electrically connected with the third output end and the fourth output end of the control module, the output end of the latch module is respectively and electrically connected with the second input end and the third input end of the PFC driving module and the second input end of the DCDC driving module, and when the input signal comprises an abnormal signal, the latch module outputs a latch signal; when the latch module receives a reset signal output by the control module, the latch module resets the parameters of the vehicle-mounted charger according to the reset signal;
the first input end of the PFC driving module is electrically connected with the first output end of the control module, the output end of the PFC driving module is electrically connected with the PFC module, and the PFC driving module outputs a PFC driving signal according to the driving control signal and the latching signal and is used for driving the PFC module;
the first input end of the DCDC driving module is electrically connected with the second output end of the control module, the output end of the DCDC driving module is electrically connected with the DCDC module, and the DCDC driving module outputs a DCDC driving signal according to the driving control signal and the latching signal and is used for driving the DCDC module.
Optionally, in the vehicle-mounted battery charger, when the input signal includes an abnormal signal and the abnormal signal includes a fault signal, the latch module outputs a latch signal, and the control module outputs a reset signal.
Optionally, in the vehicle-mounted battery charger, the latch module includes an overcurrent latch module and a fault latch module, wherein,
the first input end of the overcurrent latch module is used for capturing an input signal, the second input end of the overcurrent latch module is electrically connected with the third output end of the control module, the output end of the overcurrent latch module is electrically connected with the second input end of the PFC driving module, and when the input signal captured by the overcurrent latch module contains an overcurrent signal, the overcurrent latch module outputs a PFC OCP latch signal and prohibits the PFC driving module from outputting a PFC driving signal; when the overcurrent latch module receives a reset signal output by the control module, the overcurrent latch module resets the PFC OCP latch signal according to the reset signal;
the first input end of the fault latch module is used for capturing an input signal, the second input end of the fault latch module is electrically connected with the fourth output end of the control module, the first output end of the fault latch module is electrically connected with the third input end of the PFC driving module, the second output end of the fault latch module is electrically connected with the second input end of the DCDC driving module, and when the input signal captured by the fault latch module contains a fault signal, the fault latch module outputs the fault latch signal and prohibits the PFC driving module and the DCDC driving module from outputting a PFC driving signal and a DCDC driving signal; when the fault latch module receives the reset signal output by the control module, the fault latch module resets the fault latch signal according to the reset signal.
Optionally, in the vehicle-mounted battery charger, the process of performing software diagnosis on the overcurrent signal by the control module includes: and detecting the overcurrent times and each overcurrent time in the overcurrent time window, comparing the overcurrent times with the limited times and each overcurrent time with the limited time, and identifying the lightning surge working condition according to the comparison result.
Optionally, in the vehicle-mounted charger, the reset signal includes a PFC OCP reset signal and a fault reset signal,
when the overcurrent times in the overcurrent time window exceed the limited times, and/or each time the overcurrent time exceeds the limited time, the control module identifies the non-lightning surge working condition and outputs a fault reset signal;
when the overcurrent times in the overcurrent time window do not exceed the limited times and the overcurrent time does not exceed the limited time every time, the control module outputs a PFC OCP reset signal, detects the overcurrent times in the set time and the overcurrent time every time, compares the overcurrent times with the set times and the overcurrent time every time with the set time, and identifies the lightning surge working condition according to the comparison result.
Optionally, in the vehicle-mounted charger, when the overcurrent times within the set time do not exceed the set times and each overcurrent time does not exceed the set time, the control module identifies a lightning surge condition; and when the overcurrent times in the set time exceed the set times, and/or each time the overcurrent time exceeds the set time, the control module identifies the non-lightning surge working condition.
Optionally, in the vehicle-mounted charger, the overcurrent latch module includes a not gate and a first latch, wherein,
the input end of the NOT gate is used for capturing an input signal, and when the input signal comprises an overcurrent signal, the NOT gate outputs a low-level signal;
the first input end of the first latch is electrically connected with the not gate, the second input end of the first latch is electrically connected with the third output end of the control module, the output end of the first latch is electrically connected with the second input end of the PFC driving module, when the not gate outputs a low-level signal, the first latch outputs a PFC OCP latch signal, and the first latch resets the PFC OCP latch signal according to a PFC OCP reset signal output by the control module.
Optionally, in the vehicle-mounted charger, the fault latch module includes a nor gate and a second latch, wherein,
the input end of the NOR gate is used for capturing an input signal, and the NOR gate outputs a low-level signal when the input signal comprises a fault signal;
the first input end of the second latch is electrically connected with the output end of the nor gate, the second input end of the second latch is electrically connected with the fourth output end of the control module, the first output end of the second latch is electrically connected with the third input end of the PFC driving module, the second output end of the second latch is electrically connected with the second input end of the DCDC driving module, when the nor gate outputs a low-level signal, the second latch outputs a fault latch signal to the PFC driving module and the DCDC driving module, and the second latch resets the fault latch signal according to a fault reset signal output by the control module.
Optionally, in the vehicle-mounted charger, the PFC driving module includes a PFC driving unit and an and gate, wherein,
the first input end of the AND gate is electrically connected with the output end of the first latch, the second input end of the AND gate is electrically connected with the first output end of the second latch, and the AND gate outputs a low level signal when the first latch outputs a PFC OCP latch signal and/or the second latch outputs a fault latch signal;
the first input end of the PFC driving unit is electrically connected with the first output end of the control module, the second input end of the PFC driving unit is electrically connected with the output end of the AND gate, the output end of the PFC driving unit is electrically connected with the PFC module, and when the AND gate outputs a low-level signal, the PFC driving unit prohibits outputting a PFC driving signal.
According to the vehicle-mounted charger and the charging method thereof, the identification of the lightning surge working condition can be realized by combining a software diagnosis method on the basis of hardware relation decoupling, namely on the basis of decoupling of a PFC driving module and a protection logic relation of a DCDC driving module when an overcurrent signal is input. Under the condition of lightning surge, the vehicle-mounted charger is ensured not to stop working, and the charging is prevented from being interrupted or stopped; under the non-lightning surge working condition, the vehicle-mounted charger is restarted quickly, the phenomena of secondary overcurrent and dead circulation of overcurrent and restarting are avoided, the risk of hardware damage caused by the phenomena is avoided, and the robustness, the charging efficiency and the user experience of the vehicle-mounted charger are effectively improved.
Drawings
FIG. 1 is a schematic structural diagram of a vehicle-mounted charger;
FIG. 2 is a flow chart of a fault diagnosis of the on-board charger of FIG. 1;
fig. 3 is a schematic structural diagram of a vehicle-mounted charger according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating software diagnosis of an overcurrent signal by a control module of the vehicle-mounted charger according to an embodiment of the present invention.
Detailed Description
The following describes the vehicle-mounted charger and the charging method thereof in further detail with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
Referring to fig. 1, a schematic structural diagram of a conventional vehicle-mounted charger is shown, where the vehicle-mounted charger is composed of a PFC module (power factor correction), a DCDC module (power conversion), a driving chip, a latch module and an MCU, and the latch module includes a nor gate and a latch. After the fault occurs, the output of the driving chip is blocked through the NOR gate and the latch, so that the vehicle-mounted charger stops working. Referring to fig. 2, a flow chart of the vehicle-mounted charger diagnosis software is shown, after the MCU detects a fault signal, the driving output of the PFC module and the DCDC module is stopped, and a fault is reported, and finally the vehicle-mounted charger stops working.
In order to enable the vehicle-mounted charger to continue charging after lightning surge is finished, the two latches can be used for respectively controlling the driving of the PFC module and the DCDC module. When the overcurrent is input and the overcurrent signal is captured, the driving of the PFC module is blocked, the MCU is used for resetting the latch signal, the later-stage DCDC continues to maintain work during the period, and the driving of the PFC module is recovered after the lightning surge is finished, so that the vehicle-mounted charger continues to charge, but the scheme has the following problems:
the first problem is that: according to the scheme, the latch signal is continuously reset after the MCU detects that the overcurrent signal is input, and secondary overcurrent is easily caused during restarting;
the second problem is that: lightning surge and real input overcurrent are not distinguished, so that the PFC module has the condition of entering into dead circulation of overcurrent and restart, and the PFC module can be damaged after a long time.
According to the national standard definition, the lightning surge time is very short, the phenomenon of multiple lightning surges can not appear in a short time, when the lightning surge occurs, the latch outputs a latch signal, the driving of the PFC module is immediately blocked, the latch signal is reset according to a specific strategy method, the later stage DCDC module continuously works during the period, and the driving of the PFC module is immediately recovered after the lightning surge disappears. Therefore, the vehicle-mounted charger can continuously output in the lightning surge period, and charging interruption or stopping is avoided.
The invention realizes the recognition of the lightning surge working condition and the non-lightning surge working condition by using a software diagnosis method. Under the working condition of lightning surge, only the driving of the PFC module is blocked, and the driving of the PFC module is recovered after the lightning surge is finished, so that the vehicle-mounted charger can continuously charge the power battery; and reporting the fault under the non-lightning surge working condition, and restarting the vehicle-mounted charger complete machine to ensure that the charging cannot stop.
Referring to fig. 3, a schematic structural diagram of a vehicle-mounted charger according to an embodiment of the invention is shown. The vehicle-mounted charger comprises: the device comprises a latch module, a control module, a PFC driving module, a PFC module, a DCDC module and a DCDC driving module.
The control module is used for capturing an input signal and outputting a driving control signal or a reset signal according to the input signal. The control module is preferably an MCU and has a first input terminal, a first output terminal (PFC drive terminal), a second output terminal (DCDC drive terminal), a third output terminal (PFC OCP reset terminal), and a fourth output terminal (fault reset terminal). The first input end of the control module is used for capturing an input signal, wherein the input signal comprises an alternating current signal, a vehicle-mounted charger output voltage signal and a capacitance voltage signal, the input signal may be a normal signal or an abnormal signal, and the abnormal signal comprises an alternating current over-current signal (IAC OCP), a vehicle-mounted charger output over-current signal (iTnet OCP), a vehicle-mounted charger output over-voltage signal (uTnet OVP), a capacitance over-voltage signal (ubull OVP) and the like. When the alternating current input side of the vehicle-mounted charger is subjected to lightning surge, a huge amount of energy is injected into the alternating current side to cause input overcurrent, trigger protection causes charging interruption, and charging cannot be completed.
The first output end of the control module is electrically connected with the first input end (IN end) of the PFC driving module, the second output end of the control module is electrically connected with the first input end (IN end) of the DCDC driving module, the third output end of the control module is electrically connected with the second input end (reset end) of the overcurrent latch module, and the fourth output end of the control module is electrically connected with the second input end (reset end) of the fault latch module. When the captured input signal of the control module is a normal signal (i.e., does not include an abnormal signal), a first output terminal of the control module outputs a PFC driving control signal, and a second output terminal of the control module outputs a DCDC driving control signal, where the driving control signal may include the PFC driving control signal and the DCDC driving control signal; when the captured input signal contains an abnormal signal and the abnormal signal contains a fault signal, the control module transmits fault information to a fault management system, and the vehicle-mounted charger is restarted to reset all parameters, namely a fourth output end of the control module outputs a fault reset signal; and when the captured input signal contains an abnormal signal and the abnormal signal contains an overcurrent signal, the control module performs software diagnosis on the overcurrent signal, and performs identification of lightning surge working conditions and output of a reset signal according to a software diagnosis result. The function of the control module is realized by software written codes.
The process of the control module for carrying out software diagnosis on the overcurrent signal comprises the following steps: and detecting the overcurrent times and each overcurrent time in the overcurrent time window, comparing the overcurrent times with the limited times and each overcurrent time with the limited time, and identifying the lightning surge working condition according to the comparison result.
When the overcurrent times in the overcurrent time window exceed the limited times and/or the overcurrent time exceeds the limited time every time, the control module identifies the non-lightning surge working condition, transmits fault information to a fault management system (DSM), and restarts the vehicle-mounted charger (OBC) to reset all parameters, namely, a fourth output end of the control module outputs a fault reset signal.
And when the overcurrent times in the overcurrent time window do not exceed the limited times and the overcurrent time does not exceed the limited time every time, the third output end of the control module outputs a PFC OCP reset signal, and after the PFC module is restarted, the control module detects the overcurrent times in the set time and the overcurrent time every time, compares the overcurrent times with the set times and the overcurrent time every time with the set time, and identifies the lightning surge working condition according to the comparison result. When the overcurrent times in the set time do not exceed the set times and the overcurrent time does not exceed the set time each time, the control module identifies the lightning surge working condition; and when the overcurrent times in the set time exceed the set times, and/or each time the overcurrent time exceeds the set time, the control module identifies the non-lightning surge working condition.
And when the input signal captured by the first input end of the control module contains an overcurrent signal, the timing function and the frequency recording function of the control module are realized through software codes. The limited number may be a natural number greater than 0, preferably 3 or 4. The defined time is preferably 400 mus. For example, when the number of overcurrent times in the overcurrent time window does not exceed 4 times and each overcurrent time does not exceed 400 μ s, the third output end of the control module outputs a PFC OCP reset signal; when the overcurrent times in the overcurrent time window exceed 4 times and/or each overcurrent time exceeds 400 mu s, the control module identifies a non-lightning surge working condition, transmits the fault information to a fault management system, and restarts the vehicle-mounted charger to reset all parameters, namely, a fourth output end of the control module outputs a fault reset signal.
The set number of times may be a natural number greater than 0, and is preferably 1. The defined time is preferably 400 mus. For example, when overcurrent does not occur again within a set time, the control module identifies a lightning surge working condition, and a third output end of the control module outputs a PFC OCP reset signal; and when the overcurrent occurs again within the set time, the control module identifies the non-lightning surge working condition, transmits the fault information to a fault management system, and restarts the vehicle-mounted charger to reset all parameters, namely, a fourth output end of the control module outputs a fault reset signal. The reset all parameters include the drive of the reset PFC module and the DCDC module, and the power parameters of the PFC module and the DCDC module, which may be the original power parameters or a part of the original power parameters.
The first input end of the latch module is used for capturing an input signal, the second input end of the latch module is electrically connected with the third output end and the fourth output end of the control module respectively, and the output end of the latch module is electrically connected with the second input end and the third input end of the PFC driving module and the second input end of the DCDC driving module respectively. When the input signal comprises an abnormal signal, the latch module outputs a latch signal; when the latch module receives the reset signal output by the control module, the latch module resets the parameters of the vehicle-mounted charger according to the reset signal.
The latch module comprises an overcurrent latch module and a fault latch module, and the overcurrent latch module and the fault latch module are arranged to decouple the protection logic relation between the PFC drive module and the rear-stage DCDC drive module when overcurrent signals are input. Wherein the content of the first and second substances,
the overcurrent latch module comprises a NOT gate and a first latch, wherein,
the input end of the NOT gate is used for capturing an input signal, and when the input signal comprises an overcurrent signal, the NOT gate outputs a low-level signal; on the contrary, when the input signal does not contain the overcurrent signal, the NOT gate outputs a high level signal.
A first input end (IN end) of the first latch is electrically connected with an output end of the not gate, a second input end (reset end) of the first latch is electrically connected with a third output end of the control module, and an output end (OUT end) of the first latch is electrically connected with a second input end of the PFC driving module. When the NOT gate outputs a high level signal, the first latch outputs the high level signal so as to enable the PFC driving module to output; when the NOT gate outputs a low level signal, the first latch outputs a low level signal, namely a PFC OCP latch signal, so as to prohibit the PFC driving module from outputting. When the first latch receives the PFC OCP reset signal, the first latch may reset the PFC OCP latch signal, so that the PFC driving module resumes outputting, that is, after the PFC OCP latch signal is reset, the PFC driving module may output the PFC driving signal again according to the PFC driving control signal output by the control module, and restart the PFC module. The Latch (Latch) is a logic element with a memory function in a digital circuit. Latching is to temporarily store the signal to maintain a certain level state, and binary digital signals "0" and "1" can be recorded in the digital circuit. Only when there is a latch signal the state of the input is saved to the output until the next latch signal.
When an overcurrent signal is input, the output of the PFC driving chip is prohibited independently through the NOT gate and the first latch, the PFC operation is stopped, and the logic decoupling with the protection of the rear-stage DCDC driving chip is realized.
The fail latch module includes a nor gate and a second latch, wherein,
the input end of the NOR gate is used for capturing an input signal, and when the input signal comprises a fault signal, the NOR gate outputs a low level signal, namely when the input signal comprises any one of an overcurrent signal output by a vehicle-mounted charger, an overvoltage signal output by the vehicle-mounted charger and a capacitor overvoltage signal, the NOR gate outputs a low level signal; conversely, when the input signal does not contain a fault signal, the nor gate outputs a high level signal.
The first input end (IN end) of the second latch is electrically connected with the output end of the nor gate, the second input end (reset end) of the second latch is electrically connected with the fourth output end of the control module, the first output end (OUT end) of the second latch is electrically connected with the third input end of the PFC driving module, and the second output end (OUT) of the second latch is electrically connected with the second input end (enable end) of the DCDC driving module. Referring to fig. 3, the first output terminal and the second output terminal of the second latch may be one output port. When the NOR gate outputs a high-level signal, the second latch outputs the high-level signal to the PFC driving module and the DCDC driving module so that the PFC driving module and the DCDC driving module can output the high-level signal; when the nor gate outputs a low level signal, the second latch outputs a low level signal, i.e., a fault latch signal, to the PFC driving module and the DCDC driving module to disable the output of the PFC driving module and the DCDC driving module. When the second latch receives a fault reset signal, the second latch can reset the fault latch signal, so that the PFC driver module and the DCDC driver module recover output, that is, after the fault latch signal is reset, the PFC driver module can output the PFC driver signal again according to the PFC driver control signal output by the control module, restart the PFC module, and the DCDC driver module can output the DCDC driver signal again according to the DCDC driver control signal output by the control module, and restart the DCDC module.
The PFC driving module comprises a PFC driving unit and an AND gate, wherein a first input end of the AND gate is electrically connected with an output end of the first latch, and a second input end of the AND gate is electrically connected with a first output end of the second latch. When the first latch outputs a PFC OCP latch signal and/or the second latch outputs a fault latch signal, the AND gate outputs a low level signal; otherwise, the AND gate outputs a high level signal.
The second input end (enable end) of the PFC driving unit is electrically connected with the output end of the AND gate, the first input end (IN end) of the PFC driving unit is electrically connected with the first output end of the control module, and the output end (OUT end) of the PFC driving unit is electrically connected with the PFC module. The PFC driving unit is a PFC driving chip, and can be a PFC driving chip carried by a conventional vehicle-mounted charging motor. The PFC driving unit outputs a PFC driving signal according to the level signal output by the AND gate, namely when the AND gate outputs a high level signal, the PFC driving unit can output the PFC driving signal, namely the PFC driving module can output the PFC driving signal according to the PFC driving control signal output by the control module so as to drive the PFC module to work; and when the AND gate outputs a low level signal, the PFC driving unit prohibits outputting so as to stop the work of the PFC module.
The DCDC driving module can be a DCDC driving chip carried by a conventional vehicle-mounted charger, a second input end of the DCDC driving chip is electrically connected with a second output end of the fault latch module, a first input end (IN) of the DCDC driving chip is electrically connected with a second output end of the control module, and an output end (OUT) of the DCDC driving chip is electrically connected with the DCDC module. And the DCDC driving module outputs a DCDC driving signal according to the driving control signal and the latching signal and is used for driving the DCDC module. Namely, when the fault latch module outputs a fault latch signal, the DCDC driving module prohibits output so as to stop the operation of the DCDC module; when the fault latch module outputs a high level signal, the DCDC driving module may output a high level signal, that is, the DCDC driving module may output a DCDC driving signal according to the DCDC driving control signal output by the control module, so as to drive the DCDC module, so that the DCDC module operates.
With continued reference to fig. 3, the DCDC module is connected to a Battery pack (Battery), the PFC module is connected to a Grid voltage (Grid), and a Capacitor (Capacitor) is connected between the DCDC module and the PFC module.
The vehicle-mounted charger provided by the invention can realize hardware decoupling, namely, the PFC driving module is decoupled from the protection logic relationship of the rear-stage DCDC driving module when overcurrent faults are input, and the recognition of the lightning surge working condition can be realized by combining a software diagnosis method.
In addition, the invention also provides a charging method of the vehicle-mounted charger, and the charging method is formed on the basis of the vehicle-mounted charger. The charging method of the vehicle-mounted charger comprises the following steps:
step S1: capturing an input signal through a latch module and a control module;
step S2: when the input signal does not include the abnormal signal, the control module outputs a driving control signal to enable the PFC driving module and the DCDC driving module to output the PFC driving signal and the DCDC driving signal, and performs step S4; when the input signal comprises an abnormal signal and the abnormal signal comprises an overcurrent signal, the latch module outputs a latch signal, the control module performs software diagnosis on the overcurrent signal, and performs identification of lightning surge working conditions and output of a reset signal according to a software diagnosis result;
step S3: receiving the reset signal through the latch module, and resetting the parameters of the vehicle-mounted charger according to the reset signal so that the PFC driving module and the DCDC driving module output a PFC driving signal and a DCDC driving signal according to the driving control signal;
step S4: and driving the PFC module and the DCDC module to work through the PFC driving signal and the DCDC driving signal, so as to realize charging of the vehicle-mounted charger.
In step S1, the input signals include an ac electrical signal, a vehicle-mounted charger output current signal, a vehicle-mounted charger output voltage signal, and a capacitance voltage signal. The input signal may be normal or abnormal, and the abnormal input signal may be, for example, an alternating current overcurrent signal, an overcurrent signal output by the vehicle-mounted charger, an overvoltage signal output by the vehicle-mounted charger, a capacitor overvoltage signal, and the like. The latch module comprises an overcurrent latch module and a fault latch module, when the input signal comprises an overcurrent signal, the overcurrent latch module outputs a PFC OCP latch signal, and when the input signal comprises a fault signal, the fault latch module outputs a fault latch signal.
Step S2 further includes: when the input signal comprises an abnormal signal and the abnormal signal comprises a fault signal, the latch module outputs a latch signal and the control module outputs a reset signal.
The latch signals comprise a PFC OPC latch signal and a fault latch signal, and the reset signals comprise a PFC OCP reset signal and a fault reset signal. Specifically, when the abnormal signal includes a fault signal, the latch module outputs a fault latch signal, prohibits the PFC driving module and the DCDC driving module from outputting the PFC driving signal and the DCDC driving signal, and the control module outputs a fault reset signal. And when the abnormal signal comprises an overcurrent signal, the latch module outputs a PFC OPC latch signal, the PFC drive module is prohibited from outputting the PFC drive signal, the control module performs software diagnosis on the overcurrent signal, and identifies the lightning surge working condition and outputs a PFC OPC reset signal according to the software diagnosis result.
In step S2, the process of software diagnosing the over-current signal by the control module includes: and detecting the overcurrent times and each overcurrent time in the overcurrent time window, comparing the overcurrent times with the limited times and each overcurrent time with the limited time, and identifying the lightning surge working condition according to the comparison result.
When the overcurrent times in the overcurrent time window exceed the limited times and/or each overcurrent time exceeds the limited time, the control module identifies a non-lightning surge working condition, transmits the fault information to a fault management system, and restarts the vehicle-mounted charger to reset all parameters, namely the control module outputs a fault reset signal;
when the number of overcurrent times in the overcurrent time window does not exceed the limit number and each time the overcurrent time does not exceed the limit time, the control module outputs the PFC OCP reset signal, and after step S4, the method further includes:
step S5: the control module detects the overcurrent times and each overcurrent time in the set time, compares the overcurrent times with the set times and each overcurrent time with the set time, and identifies the lightning surge working condition according to the comparison result.
In step S5, when the overcurrent number does not exceed the set number and each overcurrent time does not exceed the set time, the control module identifies a lightning surge condition and returns to step S1;
when the overcurrent times exceed the set times and/or each overcurrent time exceeds the set time, the control module identifies the non-lightning surge working condition, transmits the fault information to the fault management system, and restarts the vehicle-mounted charger to reset all parameters, namely the control module outputs a fault reset signal.
For example, referring to fig. 4, the process of software diagnosing the over-current signal by the control module:
the input signal is captured by the control module and the latch module. The latch module and the control module capture the overcurrent signal when the alternating current signal in the input signal rises. The rising edge is the instant when the level signal changes from a low level signal (digital "0") to a high level signal (digital "1").
When the alternating current signal captured by the latch module rises, the latch module outputs a latch signal to stop driving of the PFC module; when the latch module does not capture the over-current signal, the latch module returns to start recapturing until the over-current signal is captured. The control module starts to detect an overcurrent signal (rising edge of an alternating current signal) in an overcurrent time window, and the control module realizes a timing function and a frequency recording function through a software code, namely the software code records each overcurrent (rising edge of the alternating current signal) time and overcurrent frequency captured in the overcurrent time window and judges the overcurrent frequency and/or judges whether each overcurrent time exceeds a limit time or not, namely judges whether each overcurrent time exceeds the limit time or not and whether the overcurrent frequency exceeds the limit time or not. The defined time may be a natural number greater than 0, preferably 3 or 4. The defined time is preferably 400 mus. When the overcurrent time does not exceed the limit time and the overcurrent times do not exceed the limit times, the control module outputs a PFC OCP reset signal, clears a PFC OPC latching signal and restarts the PFC module; when the overcurrent time exceeds the limit time every time and/or the overcurrent times exceed the limit times, the control module identifies a non-lightning surge working condition, transmits the fault information to a fault management system (DSM), restarts the vehicle-mounted charger to reset all parameters, namely, outputs a fault reset signal, restarts the PFC module and the DCDC module and resets the power parameters of the PFC module and the DCDC module, wherein the power parameters can be reset to the original power or a part of the original power, and are reset according to actual needs.
And when the overcurrent time does not exceed the limit time every time and the overcurrent times do not exceed the limit times, the control module outputs a PFC OCP reset signal and restarts the PFC module. The control module continuously captures input signals, detects overcurrent signals (rising edges of alternating current signals) within set time (T), and realizes a timing function and a frequency recording function through software codes, namely, the software codes record each overcurrent (rising edges of alternating current signals) time and overcurrent frequency captured within the set time, and judges the overcurrent frequency captured within the set time (T), and/or judges whether each overcurrent time exceeds the set value, namely whether the overcurrent frequency exceeds the set value (N), and whether each overcurrent time exceeds the set value. And when the overcurrent time does not exceed the set time and the overcurrent times do not exceed the set times, the control module identifies the lightning surge working condition and resets the real overcurrent parameters, for example, the power parameters of the PFC module, and the control module resets according to actual requirements. When the overcurrent time exceeds the set time every time and/or the overcurrent times exceed the set times, the control module identifies the non-lightning surge working condition, transmits the fault information to a fault management system (DSM), and restarts the whole vehicle-mounted charger to reset all parameters.
The charging method of the vehicle-mounted charger is based on hardware decoupling, namely the PFC driving module is decoupled from the protection logic relation of the rear-stage DCDC driving module when an overcurrent signal is input, and is combined with a software diagnosis method, so that the lightning surge working condition can be identified, the vehicle-mounted charger is ensured not to stop working under the lightning surge working condition, and the charging interruption or stop is avoided; under the non-lightning surge working condition, the vehicle-mounted charger is restarted quickly, the phenomena of secondary overcurrent and dead circulation of overcurrent and restarting are avoided, the risk of hardware damage caused by the phenomena is avoided, and the robustness, the charging efficiency and the user experience of the vehicle-mounted charger are effectively improved.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.

Claims (17)

1. A charging method of a vehicle-mounted charger is characterized by comprising the following steps:
step S1: capturing an input signal through a latch module and a control module;
step S2: when the input signal does not include the abnormal signal, the control module outputs a driving control signal to enable the PFC driving module and the DCDC driving module to output the PFC driving signal and the DCDC driving signal, and performs step S4; when the input signal comprises an abnormal signal and the abnormal signal comprises an overcurrent signal, the latch module outputs a latch signal, the control module performs software diagnosis on the overcurrent signal, and performs identification of lightning surge working conditions and output of a reset signal according to a software diagnosis result;
step S3: receiving the reset signal through the latch module, and resetting the parameters of the vehicle-mounted charger according to the reset signal so that the PFC driving module and the DCDC driving module output a PFC driving signal and a DCDC driving signal according to a driving control signal;
step S4: and driving the PFC module and the DCDC module to work through the PFC driving signal and the DCDC driving signal, so as to realize charging of the vehicle-mounted charger.
2. The charging method of the vehicle-mounted charger according to claim 1, wherein the step S2 further includes: when the input signal comprises an abnormal signal and the abnormal signal comprises a fault signal, the latch module outputs a latch signal and the control module outputs a reset signal.
3. The charging method of the vehicle-mounted charger according to claim 2, wherein the latch module comprises an overcurrent latch module and a fault latch module, and when the input signal comprises an overcurrent signal, the overcurrent latch module outputs a PFC OCP latch signal; when the input signal contains a fault signal, the fault latch module outputs a fault latch signal.
4. The charging method of the vehicle-mounted charger according to claim 1, wherein in step S2, the process of performing software diagnosis on the overcurrent signal by the control module includes: and detecting the overcurrent times and each overcurrent time in the overcurrent time window, comparing the overcurrent times with the limited times and each overcurrent time with the limited time, and identifying the lightning surge working condition according to the comparison result.
5. The charging method of the vehicle-mounted charger according to claim 4, characterized in that,
when the overcurrent times in the overcurrent time window exceed the limited times, and/or each time the overcurrent time exceeds the limited time, the control module identifies the non-lightning surge working condition and outputs a fault reset signal;
when the number of overcurrent times in the overcurrent time window does not exceed the limit number and each time the overcurrent time does not exceed the limit time, the control module outputs the PFC OCP reset signal, and after step S4, the method further includes:
step S5: and detecting the overcurrent times and each overcurrent time within the set time through the control module, comparing the overcurrent times with the set times and each overcurrent time with the set time, and identifying the lightning surge working condition according to the comparison result.
6. The charging method of the vehicle-mounted charger according to claim 5, characterized in that in step S5,
when the overcurrent times in the set time do not exceed the set times and the overcurrent time does not exceed the set time each time, the control module identifies the lightning surge working condition and returns to the step S1;
and when the overcurrent times in the set time exceed the set times, and/or when the overcurrent time exceeds the set time each time, the control module identifies the non-lightning surge working condition and outputs a fault reset signal.
7. The charging method of the vehicle-mounted charger according to claim 1, wherein the over-current signal comprises an alternating current over-current signal.
8. The charging method of the vehicle-mounted charger according to claim 2, wherein the fault signal comprises at least one of an overcurrent signal output by the vehicle-mounted charger, an overvoltage signal output by the vehicle-mounted charger and an overvoltage signal output by a capacitor.
9. A vehicle-mounted charger is characterized by comprising a latch module, a control module, a PFC driving module, a PFC module, a DCDC module and a DCDC driving module, wherein,
the input end of the control module is used for capturing an input signal, and when the input signal does not contain an abnormal signal, the control module outputs a driving control signal so that the PFC driving module and the DCDC driving module output a PFC driving signal and a DCDC driving signal; when the input signal comprises an abnormal signal and the abnormal signal comprises an overcurrent signal, the control module performs software diagnosis on the overcurrent signal, and performs identification of lightning surge conditions and output of a reset signal according to the software diagnosis result;
the first input end of the latch module is used for capturing an input signal, the second input end of the latch module is respectively and electrically connected with the third output end and the fourth output end of the control module, the output end of the latch module is respectively and electrically connected with the second input end and the third input end of the PFC driving module and the second input end of the DCDC driving module, and when the input signal comprises an abnormal signal, the latch module outputs a latch signal; when the latch module receives a reset signal output by the control module, the latch module resets the parameters of the vehicle-mounted charger according to the reset signal;
the first input end of the PFC driving module is electrically connected with the first output end of the control module, the output end of the PFC driving module is electrically connected with the PFC module, and the PFC driving module outputs a PFC driving signal according to the driving control signal and the latching signal and is used for driving the PFC module;
the first input end of the DCDC driving module is electrically connected with the second output end of the control module, the output end of the DCDC driving module is electrically connected with the DCDC module, and the DCDC driving module outputs a DCDC driving signal according to the driving control signal and the latching signal and is used for driving the DCDC module.
10. The vehicle-mounted charger according to claim 9, wherein when the input signal includes an abnormal signal and the abnormal signal includes a fault signal, the latch module outputs a latch signal and the control module outputs a reset signal.
11. The vehicle-mounted charger according to claim 10, characterized in that said latch module comprises an overcurrent latch module and a fault latch module, wherein,
the first input end of the overcurrent latch module is used for capturing an input signal, the second input end of the overcurrent latch module is electrically connected with the third output end of the control module, the output end of the overcurrent latch module is electrically connected with the second input end of the PFC driving module, and when the input signal captured by the overcurrent latch module contains an overcurrent signal, the overcurrent latch module outputs a PFC OCP latch signal and prohibits the PFC driving module from outputting a PFC driving signal; when the overcurrent latch module receives a reset signal output by the control module, the overcurrent latch module resets the PFC OCP latch signal according to the reset signal;
the first input end of the fault latch module is used for capturing an input signal, the second input end of the fault latch module is electrically connected with the fourth output end of the control module, the first output end of the fault latch module is electrically connected with the third input end of the PFC driving module, the second output end of the fault latch module is electrically connected with the second input end of the DCDC driving module, and when the input signal captured by the fault latch module contains a fault signal, the fault latch module outputs the fault latch signal and prohibits the PFC driving module and the DCDC driving module from outputting a PFC driving signal and a DCDC driving signal; when the fault latch module receives the reset signal output by the control module, the fault latch module resets the fault latch signal according to the reset signal.
12. The vehicle-mounted charger according to claim 9, wherein the process of the control module performing software diagnosis on the overcurrent signal comprises: and detecting the overcurrent times and each overcurrent time in the overcurrent time window, comparing the overcurrent times with the limited times and each overcurrent time with the limited time, and identifying the lightning surge working condition according to the comparison result.
13. The vehicle-mounted charger according to claim 12, characterized in that said reset signal comprises a PFC OCP reset signal and a fault reset signal,
when the overcurrent times in the overcurrent time window exceed the limited times, and/or each time the overcurrent time exceeds the limited time, the control module identifies the non-lightning surge working condition and outputs a fault reset signal;
when the overcurrent times in the overcurrent time window do not exceed the limited times and the overcurrent time does not exceed the limited time every time, the control module outputs a PFC OCP reset signal, detects the overcurrent times in the set time and the overcurrent time every time, compares the overcurrent times with the set times and the overcurrent time every time with the set time, and identifies the lightning surge working condition according to the comparison result.
14. The vehicle-mounted charger according to claim 13, characterized in that the control module identifies a lightning surge condition when the number of overcurrent times in the set time does not exceed the set number of overcurrent times and each overcurrent time does not exceed the set time; and when the overcurrent times in the set time exceed the set times, and/or each time the overcurrent time exceeds the set time, the control module identifies the non-lightning surge working condition.
15. The vehicle-mounted charger according to claim 11, characterized in that said overcurrent latch module comprises a not gate and a first latch, wherein,
the input end of the NOT gate is used for capturing an input signal, and when the input signal comprises an overcurrent signal, the NOT gate outputs a low-level signal;
the first input end of the first latch is electrically connected with the not gate, the second input end of the first latch is electrically connected with the third output end of the control module, the output end of the first latch is electrically connected with the second input end of the PFC driving module, when the not gate outputs a low-level signal, the first latch outputs a PFC OCP latch signal, and the first latch resets the PFC OCP latch signal according to a PFC OCP reset signal output by the control module.
16. The vehicle-mounted charger according to claim 15, characterized in that said fault latch module comprises a nor gate and a second latch, wherein,
the input end of the NOR gate is used for capturing an input signal, and the NOR gate outputs a low-level signal when the input signal comprises a fault signal;
the first input end of the second latch is electrically connected with the output end of the nor gate, the second input end of the second latch is electrically connected with the fourth output end of the control module, the first output end of the second latch is electrically connected with the third input end of the PFC driving module, the second output end of the second latch is electrically connected with the second input end of the DCDC driving module, when the nor gate outputs a low-level signal, the second latch outputs a fault latch signal to the PFC driving module and the DCDC driving module, and the second latch resets the fault latch signal according to a fault reset signal output by the control module.
17. The vehicle-mounted charger according to claim 16, characterized in that the PFC driving module comprises a PFC driving unit and an AND gate, wherein,
the first input end of the AND gate is electrically connected with the output end of the first latch, the second input end of the AND gate is electrically connected with the first output end of the second latch, and the AND gate outputs a low level signal when the first latch outputs a PFC OCP latch signal and/or the second latch outputs a fault latch signal;
the first input end of the PFC driving unit is electrically connected with the first output end of the control module, the second input end of the PFC driving unit is electrically connected with the output end of the AND gate, the output end of the PFC driving unit is electrically connected with the PFC module, and when the AND gate outputs a low-level signal, the PFC driving unit prohibits outputting a PFC driving signal.
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