CN113183779B - Vehicle-mounted charger and charging method thereof - Google Patents

Vehicle-mounted charger and charging method thereof Download PDF

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Publication number
CN113183779B
CN113183779B CN202110434957.7A CN202110434957A CN113183779B CN 113183779 B CN113183779 B CN 113183779B CN 202110434957 A CN202110434957 A CN 202110434957A CN 113183779 B CN113183779 B CN 113183779B
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signal
module
latch
overcurrent
pfc
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CN113183779A (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 contains an overcurrent signal, the control module carries out software diagnosis on the overcurrent signal so as to identify a lightning surge 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; the PFC module and the DCDC module are driven to work through the PFC driving signal and the DCDC driving signal. The charging method of the vehicle-mounted charger can realize the identification of lightning surge working conditions and non-lightning surge working conditions, and can enable the vehicle-mounted charger to continuously charge the power battery under the lightning surge working conditions and the non-lightning surge working conditions.

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 wider popularization of new energy automobiles, more and more electric automobiles or hybrid electric automobiles are in the life of common consumers, a vehicle-mounted charger is an indispensable component part of the electric automobiles/hybrid electric automobiles, and converts an alternating current signal of a power grid into a direct current signal to charge a power battery, but in some thunderstorm weather (namely lightning surge working conditions), the vehicle-mounted charger can not charge the power battery or can cause charging interruption to influence the use of the electric automobiles, so that special treatment is required to be carried out on the lightning surge working conditions to meet the requirements of relevant regulations and the charging adaptability of the vehicle-mounted charger is improved.
When the alternating current input side of the vehicle-mounted charger is subjected to lightning surge, the alternating current side can be injected with huge energy to cause input overcurrent, and charging interruption is caused by triggering protection, so that charging cannot be completed.
In order to enable the vehicle-mounted charger to continue charging after the lightning surge is finished, when input overcurrent occurs and when an overcurrent signal is captured, driving of the PFC module is blocked, a reset latch signal is removed, during the period, the post-stage DCDC continues to maintain working, and driving of the PFC module is restored after the lightning surge is finished, so that the vehicle-mounted charger continues charging, but the scheme has the following problems:
first: in the scheme, after an input overcurrent latch signal is detected, the latch is continuously reset, and secondary overcurrent is easily caused when the latch is restarted;
second,: the lightning surge is not distinguished from the real input overcurrent, so that the PFC has the conditions of entering the overcurrent and restarting dead cycle, and the PFC can be damaged for 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 identification of lightning surge conditions, and enable the vehicle-mounted charger to continuously output during the lightning surge period, and avoid the interruption or stop of charging.
To achieve the above and other related objects, the present invention provides a charging method of a vehicle-mounted charger, comprising:
Step S1: capturing an input signal through a latch module and a control module;
step S2: 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 PFC driving signals and DCDC driving signals, and step S4 is executed; when the input signal contains an abnormal signal and the abnormal signal contains an overcurrent signal, the latch module outputs a latch signal, the control module performs software diagnosis on the overcurrent signal, and performs recognition of lightning surge working conditions and output of reset signals according to the software diagnosis result;
step S3: the reset signal is received through the latch module, and parameter reset of the vehicle-mounted charger is carried out according to the reset signal, so that the PFC driving module and the DCDC driving module output PFC driving signals and DCDC driving signals according to the driving control signals;
step S4: and driving the PFC module and the DCDC module to work by the PFC driving signal and the DCDC driving signal, so as to realize the charging of the vehicle-mounted charger.
Optionally, in the charging method of the vehicle-mounted charger, 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.
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; the fault latch module outputs a fault latch signal when the input signal includes a fault 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: detecting the overcurrent times and each overcurrent time in an overcurrent time window, comparing the overcurrent times with the limiting times, comparing each overcurrent time with the limiting time, and identifying lightning surge working conditions according to comparison results.
Optionally, in the charging method of the vehicle-mounted charger, the control module identifies a non-lightning surge condition when the overcurrent times in the overcurrent time window exceeds a limiting time and/or each overcurrent time exceeds a limiting time, and the control module outputs a fault reset signal;
when the number of times of overcurrent in the overcurrent time window does not exceed the limiting number of times and each time of overcurrent time does not exceed the limiting time, the control module outputs a PFC OCP reset signal, and after step S4, the method further comprises:
Step S5: the control module is used for detecting the overcurrent times and each overcurrent time in the set time, comparing the overcurrent times with the set times, 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 each overcurrent time does not exceed the set time, the control module identifies lightning surge working conditions and returns to the step S1;
and when the overcurrent times in the set time exceeds the set times, and/or each overcurrent time exceeds the set time, the control module identifies a non-lightning surge working condition, and the control module outputs a fault reset signal.
Optionally, in the charging method of the vehicle-mounted charger, the overcurrent signal includes an ac overcurrent signal.
Optionally, in the charging method of the vehicle-mounted charger, the fault signal includes at least one of an output overcurrent signal of the vehicle-mounted charger, an output overvoltage signal of the vehicle-mounted charger and a capacitance overvoltage signal.
To achieve the above and other related objects, the present invention also 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 PFC driving signals and DCDC driving signals; when the 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 recognition of lightning surge working conditions and output of reset signals according to a 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 electrically connected with the third output end and the fourth output end of the control module respectively, the output ends of the latch module are electrically connected with the second input end of the PFC driving module, the third input end of the PFC driving module and the second input end of the DCDC driving module respectively, and when the input signal contains 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 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 latch 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 latch signal and is used for driving the DCDC module.
Optionally, in the vehicle-mounted 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 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 the overcurrent signal, the overcurrent latch module outputs a PFC OCP latch signal and inhibits 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 a fault latch signal and inhibits the PFC driving module and the DCDC driving module from outputting PFC driving signals and DCDC driving signals; 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 charger, the software diagnosis process of the control module on the overcurrent signal includes: detecting the overcurrent times and each overcurrent time in an overcurrent time window, comparing the overcurrent times with the limiting times, comparing each overcurrent time with the limiting time, and identifying lightning surge working conditions according to comparison results.
Optionally, in the vehicle-mounted charger, the reset signal includes a PFC OCP reset signal and a fault reset signal,
The overcurrent times in the overcurrent time window exceed the limiting times, and/or when the overcurrent time exceeds the limiting time each time, the control module identifies a non-lightning surge working condition, and the control module outputs a fault reset signal;
and when the overcurrent times in the overcurrent time window do not exceed the limiting times and the overcurrent time does not exceed the limiting time each time, the control module outputs a PFC OCP reset signal, detects the overcurrent times and the overcurrent time each time in the set time, compares the overcurrent times with the set times, compares the overcurrent time each 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 in 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 exceeds the set times, and/or each overcurrent time exceeds the set time, the control module identifies a 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 when the input signal contains a fault signal, the NOR gate outputs a low-level 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 PFC driving signals.
According to the vehicle-mounted charger and the charging method thereof, on the basis of decoupling of the hardware relationship, namely, decoupling of the PFC driving module and the protection logic relationship of the DCDC driving module when the overcurrent signal is input, the recognition of the lightning surge condition can be realized by combining with a software diagnosis method. Under the lightning surge working condition, 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 enabled to restart rapidly, the phenomenon of secondary overcurrent and dead circulation of overcurrent and restarting is avoided, the risk of hardware damage caused by the phenomenon 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 diagram of a vehicle-mounted charger;
FIG. 2 is a flow chart of a fault diagnosis of the onboard battery 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 of software diagnosis of an overcurrent signal by the control module of the vehicle-mounted charger according to an embodiment of the invention.
Detailed Description
The vehicle-mounted charger and the charging method thereof provided by the invention are further described in detail below 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 should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention.
Referring to fig. 1, there is shown a schematic structural diagram of a conventional vehicle-mounted charger, which is composed of a PFC module (power factor correction), a DCDC module (power conversion), a driving chip, a latch module and an MCU, wherein 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 diagnostic software of the vehicle-mounted charger is shown, after the MCU detects a fault signal, the driving output of the PFC module and the DCDC module is stopped, the 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, driving of the PFC module and the DCDC module can be controlled through the two latches respectively. When input overcurrent occurs and the overcurrent signal is captured, the driving of the PFC module is blocked, the latch signal is reset through the MCU, the post-stage DCDC continues to maintain operation during the period, and the driving of the PFC module is restored after the lightning surge is finished, so that the vehicle-mounted charger continues to charge, but the scheme has the following problems:
problem one: according to the scheme, after the MCU detects an input overcurrent signal, the latch signal is continuously reset, and secondary overcurrent is easily caused when the MCU is restarted;
and a second problem: the lightning surge and the real input overcurrent are not distinguished, so that the PFC module is subjected to the condition of entering the overcurrent and restarting dead cycle, and the PFC module can be damaged for a long time.
According to national standard definition, the time of lightning surge is very short, the phenomenon of multiple lightning surges can not occur 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, during the period, the post-stage DCDC module continuously works, and the driving of the PFC module is immediately restored after the lightning surge disappears. Therefore, the vehicle-mounted charger can continuously output during lightning surge, and charging interruption or stopping is avoided.
The invention realizes the identification of lightning surge working conditions and non-lightning surge working conditions by using a software diagnosis method. Under the lightning surge working condition, 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 under the non-lightning surge working condition, a fault is reported, so that the whole vehicle-mounted charger is restarted, and the charging is ensured not to stop.
Referring to fig. 3, a schematic structural diagram of a vehicle-mounted charger according to an embodiment of the present invention is shown. The vehicle-mounted charger comprises: the power supply system 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 the control module has a first input, a first output (PFC driver), a second output (DCDC driver), a third output (PFC OCP reset), and a fourth output (fault reset). The first input end of the control module is used for capturing input signals, the input signals comprise alternating current signals, vehicle-mounted charger output voltage signals and capacitance voltage signals, the input signals can be normal signals or abnormal signals, and the abnormal signals comprise alternating current over-current signals (IAC OCP), vehicle-mounted charger output over-current signals (iTnet OCP), vehicle-mounted charger output overvoltage signals (uTnet OVP), capacitance overvoltage signals (uBulk OVP) and the like. When the alternating current input side of the vehicle-mounted charger is subjected to lightning surge, the alternating current side is injected with huge energy to cause input overcurrent, and the charging is interrupted due to triggering protection, so that the 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 is a normal signal (i.e. does not contain an abnormal signal), the control module outputs a PFC drive control signal at a first output end of the control module and outputs a DCDC drive control signal at a second output end of the control module, i.e. the drive control signal may include the PFC drive control signal and the DCDC drive 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 to restart the whole vehicle-mounted charger so as to reset all parameters, namely, a fourth output end of the control module outputs a fault reset signal; 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 recognition of lightning surge working conditions and output of reset signals according to a software diagnosis result. The function of the control module is realized by writing codes through software.
The process of the control module for performing software diagnosis on the overcurrent signal comprises the following steps: detecting the overcurrent times and each overcurrent time in an overcurrent time window, comparing the overcurrent times with the limiting times, comparing each overcurrent time with the limiting time, and identifying lightning surge working conditions according to comparison results.
And when the overcurrent times in the overcurrent time window exceeds the limiting times, and/or when the overcurrent time exceeds the limiting time each time, the control module identifies a non-lightning surge working condition, the control module transmits fault information to a fault management system (DSM) and restarts the whole 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 limiting times and the overcurrent time does not exceed the limiting time each 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 and the overcurrent time each time in the set time, compares the overcurrent times with the set times and the overcurrent time each time with the set time, and identifies the lightning surge working condition according to the comparison result. The control module identifies lightning surge working conditions when the overcurrent times in the set time do not exceed the set times and each overcurrent time does not exceed the set time; and when the overcurrent times in the set time exceeds the set times, and/or each overcurrent time exceeds the set time, the control module identifies a non-lightning surge working condition.
And when the input signal captured by the first input end of the control module comprises an overcurrent signal, realizing a timing function and a frequency recording function of the control module through software codes. The defined number may be a natural number greater than 0, preferably 3 or 4. The defined time is preferably 400 mus. For example, when the overcurrent times in the overcurrent time window do not exceed 4 times and each overcurrent time does not exceed 400 μs, the third output end of the control module outputs a PFC OCP reset signal; and (3) when the overcurrent times in the overcurrent time window exceeds 4 times and/or when the overcurrent time exceeds 400 mu s each time, the control module identifies a non-lightning surge working condition, the control module transmits the 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.
The set number may be a natural number greater than 0, preferably 1. The defined time is preferably 400 mus. For example, when no overcurrent occurs again within a set time, the control module recognizes a lightning surge condition, and a third output end of the control module outputs a PFC OCP reset signal; and when overcurrent occurs again in the set time, the control module recognizes a non-lightning surge working condition, the control module transmits the fault information to a fault management system, and the whole vehicle-mounted charger is restarted to reset all parameters, namely, a fourth output end of the control module outputs a fault reset signal. The resetting all parameters comprise the driving of the PFC module and the DCDC module, and the power parameters of the PFC module and the DCDC module, and can be original power parameters or 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 of the PFC driving module, the third input end of the PFC driving module and the second input end of the DCDC driving module respectively. When the input signal contains 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 realize the decoupling of the PFC driving module and the protection logic relationship of the post-stage DCDC driving module when an overcurrent signal is input. Wherein, the liquid crystal display device comprises a liquid crystal display device,
the over-current latch module comprises an 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; conversely, when the input signal does not include an overcurrent signal, the NOT gate outputs a high-level signal.
The first input end (IN end) of the first latch is electrically connected with the output end of the NOT gate, the second input end (reset end) of the first latch is electrically connected with the third output end of the control module, and the output end (OUT end) of the first latch is electrically connected with the 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 that the PFC driving module can output the high level signal; 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 inhibit the PFC driving module from outputting. When the first latch receives the PFC OCP reset signal, the PFC OCP latch signal can be reset, so that the PFC driving module can recover to output, namely after the PFC OCP latch signal is reset, the PFC driving module can output the PFC driving signal again according to the PFC driving control signal output by the control module, and the PFC module is restarted. The Latch (Latch) is a logic element with a memory function in a digital circuit. The latch 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 the state of the input is saved to the output when there is a latch signal until the next latch signal.
When an overcurrent signal is input, the output of the PFC driving chip is independently forbidden through the NOT gate and the first latch, the PFC operation is stopped, and the protection logic decoupling with the post-stage DCDC driving chip is realized.
The 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, when the input signal contains a fault signal, the NOR gate outputs a low-level signal, namely when the input signal contains any one of an over-current signal output by the vehicle-mounted charger, an over-voltage signal output by the vehicle-mounted charger and a capacitance over-voltage signal, the NOR gate outputs the low-level signal; conversely, when the input signal does not include 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 prohibit the PFC driving module and the DCDC driving module from outputting. When the second latch receives the fault reset signal, the fault latch signal can be reset, so that the PFC driving module and the DCDC driving module recover to output, namely after the fault latch signal is reset, the PFC driving module can output the PFC driving signal again according to the PFC driving control signal output by the control module, the PFC module is restarted, and the DCDC driving module can output the DCDC driving signal again according to the DCDC driving control signal output by the control module, and the DCDC module is restarted.
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 (enabling 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 of a conventional vehicle-mounted charger. 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 a 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 output so as to stop the PFC module from working.
The DCDC driving module can be a DCDC driving chip provided with 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 latch 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 work of the DCDC module; when the fault latch module outputs a high-level signal, the DCDC driving module can output the high-level signal, namely, the DCDC driving module can output a DCDC driving signal according to a DCDC driving control signal output by the control module so as to drive the DCDC module to work.
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 further connected between the DCDC module and the PFC module.
According to the vehicle-mounted charger provided by the invention, hardware decoupling can be realized, namely, the PFC driving module is decoupled from the protection logic relationship of the post-stage DCDC driving module when an overcurrent fault is input, and the recognition of a lightning surge working condition can be realized by combining a software diagnosis method, so that the driving of the PFC module is only blocked under the lightning surge working condition, the driving of the PFC module is restored after the lightning surge is finished, the vehicle-mounted charger can continuously charge a power battery, and the failure is reported under a non-lightning surge working condition, so that the vehicle-mounted charger is restarted to ensure that the charging cannot stop.
In addition, the invention also provides a charging method of the vehicle-mounted charger, which 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 contain an abnormal signal, the control module outputs a driving control signal so that the PFC driving module and the DCDC driving module output PFC driving signals and DCDC driving signals, and step S4 is executed; when the input signal contains an abnormal signal and the abnormal signal contains an overcurrent signal, the latch module outputs a latch signal, the control module performs software diagnosis on the overcurrent signal, and performs recognition of lightning surge working conditions and output of reset signals according to the software diagnosis result;
step S3: the reset signal is received through the latch module, and parameter reset of the vehicle-mounted charger is carried out according to the reset signal, so that the PFC driving module and the DCDC driving module output PFC driving signals and DCDC driving signals according to the driving control signals;
step S4: and driving the PFC module and the DCDC module to work by the PFC driving signal and the DCDC driving signal, so as to realize the 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 capacitor voltage signal. The input signal may be normal or abnormal, for example, an ac over-current signal, an output over-current signal from the vehicle-mounted charger, an output over-voltage signal from the vehicle-mounted charger, and a capacitive over-voltage signal. The latch module comprises an overcurrent latch module and a fault latch module, wherein the overcurrent latch module outputs a PFC OCP latch signal when the input signal contains an overcurrent signal, and the fault latch module outputs a fault latch signal when the input signal contains a fault signal.
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.
The latch signals include a PFC OPC latch signal and a fault latch signal, and the reset signals include 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, the PFC drive module and the DCDC drive module are prohibited from outputting the PFC drive signal and the DCDC drive 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 driving module is forbidden to output the PFC driving signal, the control module performs software diagnosis on the overcurrent signal, and performs recognition of lightning surge working conditions and output of a PFC OPC reset signal according to a software diagnosis result.
In step S2, the process of the control module performing software diagnosis on the over-current signal includes: detecting the overcurrent times and each overcurrent time in an overcurrent time window, comparing the overcurrent times with the limiting times, comparing each overcurrent time with the limiting time, and identifying lightning surge working conditions according to comparison results.
The over-current times in the over-current time window exceed the limiting times, and/or when the over-current time exceeds the limiting time each time, the control module identifies a non-lightning surge working condition, the control module transmits the fault information to a fault management system, and the vehicle-mounted charger is restarted to reset all parameters, namely the control module outputs a fault reset signal;
the control module outputs a PFC OCP reset signal when the number of times of overcurrent in the overcurrent time window does not exceed the limit number of times and each time of overcurrent time does not exceed the limit time, and after step S4, the control module 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, compares the overcurrent time with the set time, and identifies the lightning surge working condition according to the comparison result.
In step S5, when the overcurrent times 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 returns to step S1;
and when the overcurrent times exceeds the set times and/or when the overcurrent time exceeds the set time, the control module identifies a non-lightning surge working condition, and the control module transmits the fault information to a fault management system to restart the whole vehicle-mounted charger so as to reset all parameters, namely, the control module outputs a fault reset signal.
For example, referring to fig. 4, the control module performs a software diagnostic process on the over-current signal:
the input signal is captured by the control module and the latch module. The rising edge of the alternating current signal in the input signal captured by the latch module and the control module indicates that the latch module and the control module capture the overcurrent signal. The rising edge is the instant at which 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 has a rising edge, the latch module outputs a latch signal to stop driving of the PFC module; and when the latch module does not capture the overcurrent signal, returning to start to capture again until the overcurrent signal is captured. The control module starts to detect an overcurrent signal (rising edge occurs in an alternating current signal) in the 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 the time and the overcurrent frequency of each overcurrent (rising edge occurs in the alternating current signal) captured in the overcurrent time window, and judges whether the overcurrent frequency and/or whether the overcurrent time exceeds a limit time or not, namely judges whether the overcurrent time exceeds a limit time or not and whether the overcurrent frequency exceeds a 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 limiting time and the overcurrent times do not exceed the limiting times, the control module outputs a PFC OCP reset signal, clears a PFC OPC latch signal and restarts the PFC module; when the overcurrent time exceeds the limiting time and/or the overcurrent times exceed the limiting times, the control module identifies a non-lightning surge working condition, the control module transmits the fault information to a fault management system (DSM), the whole machine of the vehicle-mounted charger is restarted to reset all parameters, namely, a fault reset signal is output, the PFC module and the DCDC module are restarted, and the power parameters of the PFC module and the DCDC module are reset, wherein the power parameters can be reset to the original power or a part of the original power, and the reset is carried out according to actual needs.
And when the overcurrent time does not exceed the limiting time and the overcurrent times do not exceed the limiting times, the control module outputs a PFC OCP reset signal and restarts the PFC module. The control module continues to capture the input signal, and the control module starts to detect the overcurrent signal (the rising edge occurs in the alternating current signal) in the set time (T), and the control module realizes a timing function and a frequency recording function through a software code, namely, the software code records the time and the frequency of each overcurrent (the rising edge occurs in the alternating current signal) captured in the set time, and judges whether the frequency of each overcurrent captured in the set time (T) is over-set or not, and/or whether the frequency of each overcurrent exceeds the set frequency (N) or not, and whether the time of each overcurrent exceeds the set time or not. And when the overcurrent time does not exceed the set time and the overcurrent times do not exceed the set times, the control module recognizes a lightning surge working condition, resets a real overcurrent parameter, for example, resets the power parameter of the PFC module, and particularly resets according to actual needs. And when the overcurrent time exceeds the set time and/or the overcurrent times exceeds the set times, the control module identifies a non-lightning surge working condition, and the control module transmits the fault information to a fault management system (DSM) to restart the whole vehicle of the vehicle-mounted charger so as to reset all parameters.
According to the charging method of the vehicle-mounted charger, on the basis of hardware decoupling, namely, on the basis of decoupling of the protection logic relationship between the PFC driving module and the post-stage DCDC driving module when an overcurrent signal is input, the recognition of lightning surge working conditions can be realized by combining a software diagnosis method, the vehicle-mounted charger is ensured not to stop working under the lightning surge working conditions, and charging interruption or stop is avoided; under the non-lightning surge working condition, the vehicle-mounted charger is enabled to restart rapidly, the phenomenon of secondary overcurrent and dead circulation of overcurrent and restarting is avoided, the risk of hardware damage caused by the phenomenon 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 illustrative of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, and any alterations and modifications made by those skilled in the art based on the above disclosure shall fall within the scope of the appended claims.

Claims (17)

1. The charging method of the vehicle-mounted charger is characterized by comprising the following steps of:
step S1: capturing an input signal through a latch module and a control module;
step S2: 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 PFC driving signals and DCDC driving signals, and step S4 is executed; when the input signal contains an abnormal signal and the abnormal signal contains an overcurrent signal, the latch module only outputs a PFC OCP latch signal, the control module performs software diagnosis on the overcurrent signal and recognizes a lightning surge condition according to a software diagnosis result, and when the control module recognizes the lightning surge condition, the control module only outputs a PFC OCP reset signal; when the control module recognizes a non-lightning surge working condition, the control module outputs a fault reset signal to restart the whole vehicle of the vehicle-mounted charger;
Step S3: receiving a reset signal through the latch module, and resetting 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 according to driving control signals;
step S4: and driving the PFC module and the DCDC module to work by the PFC driving signal and the DCDC driving signal, so as to realize the charging of the vehicle-mounted charger.
2. The charging method of the vehicle-mounted charger according to claim 1, further comprising, in step S2: 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 includes an overcurrent latch module and a fault latch module, and the overcurrent latch module outputs a PFC OCP latch signal when the input signal includes an overcurrent signal; the fault latch module outputs a fault latch signal when the input signal includes a fault 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: detecting the overcurrent times and each overcurrent time in an overcurrent time window, comparing the overcurrent times with the limiting times, comparing each overcurrent time with the limiting time, and identifying lightning surge working conditions according to comparison results.
5. The method for charging a vehicle-mounted battery charger according to claim 4, wherein,
the overcurrent times in the overcurrent time window exceed the limiting times, and/or when the overcurrent time exceeds the limiting time each time, the control module identifies a non-lightning surge working condition, and the control module outputs a fault reset signal;
when the number of times of overcurrent in the overcurrent time window does not exceed the limiting number of times and each time of overcurrent time does not exceed the limiting time, the control module outputs a PFC OCP reset signal, and after step S4, the method further comprises:
step S5: the control module is used for detecting the overcurrent times and each overcurrent time in the set time, comparing the overcurrent times with the set times, each overcurrent time with the set time and identifying the lightning surge working condition according to the comparison result.
6. The method for charging an on-board battery charger according to claim 5, wherein, in step S5,
when the overcurrent times in the set time do not exceed the set times and each overcurrent time does not exceed the set time, the control module identifies lightning surge working conditions and returns to the step S1;
and when the overcurrent times in the set time exceeds the set times, and/or each overcurrent time exceeds the set time, the control module identifies a non-lightning surge working condition, and the control module outputs a fault reset signal.
7. The method of charging a vehicle-mounted battery charger of claim 1, wherein the over-current signal comprises an alternating-current over-current signal.
8. The method of charging a vehicle-mounted charger of claim 2, wherein the fault signal comprises at least one of a vehicle-mounted charger output overcurrent signal, a vehicle-mounted charger output overvoltage signal, and a capacitive overvoltage signal.
9. The 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 PFC driving signals and DCDC driving signals; when the 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 recognizes a lightning surge condition according to a software diagnosis result, and when the control module recognizes the lightning surge condition, the control module only outputs a PFC OCP reset signal; when the control module recognizes a non-lightning surge working condition, the control module outputs a fault reset signal to restart the whole vehicle of the vehicle-mounted charger;
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, the output ends of the latch module are electrically connected with the second input end of the PFC driving module, the third input end of the latch module and the second input end of the DCDC driving module respectively, when the input signal contains an abnormal signal, the latch module outputs a latch signal, and when the abnormal signal contains an overcurrent signal, the latch module only outputs a PFC OCP latch signal; when the latch module receives a reset signal output by the control module, the latch module resets 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 latch 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 latch signal and is used for driving the DCDC module.
10. The vehicle-mounted charger of claim 9 wherein the latch module outputs a latch signal and the control module outputs a reset signal when the input signal comprises an abnormal signal and the abnormal signal comprises a fault signal.
11. The vehicle-mounted battery charger of claim 10, wherein the 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 the overcurrent signal, the overcurrent latch module outputs a PFC OCP latch signal and inhibits 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 a fault latch signal and inhibits the PFC driving module and the DCDC driving module from outputting PFC driving signals and DCDC driving signals; 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 of claim 9 wherein the process of the control module software diagnosing the over-current signal comprises: detecting the overcurrent times and each overcurrent time in an overcurrent time window, comparing the overcurrent times with the limiting times, comparing each overcurrent time with the limiting time, and identifying lightning surge working conditions according to comparison results.
13. The vehicle-mounted charger of claim 12 wherein the reset signal comprises a PFC OCP reset signal and a fault reset signal,
the overcurrent times in the overcurrent time window exceed the limiting times, and/or when the overcurrent time exceeds the limiting time each time, the control module identifies a non-lightning surge working condition, and the control module outputs a fault reset signal;
and when the overcurrent times in the overcurrent time window do not exceed the limiting times and the overcurrent time does not exceed the limiting time each time, the control module outputs a PFC OCP reset signal, detects the overcurrent times and the overcurrent time each time in the set time, compares the overcurrent times with the set times, compares the overcurrent time each time with the set time, and identifies the lightning surge working condition according to the comparison result.
14. The vehicle-mounted charger of claim 13, wherein the control module identifies a lightning surge condition when the number of times of overcurrent in the set time does not exceed the set number of times and each time of overcurrent does not exceed the set time; and when the overcurrent times in the set time exceeds the set times, and/or each overcurrent time exceeds the set time, the control module identifies a non-lightning surge working condition.
15. The vehicle-mounted charger of claim 11 wherein the over-current latching 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 battery charger of claim 15 wherein the 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 when the input signal contains a fault signal, the NOR gate outputs a low-level 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 of claim 16 wherein the PFC drive module comprises a PFC drive 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 PFC driving signals.
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