WO2020114520A1 - 预充电路与预充方法 - Google Patents

预充电路与预充方法 Download PDF

Info

Publication number
WO2020114520A1
WO2020114520A1 PCT/CN2019/124957 CN2019124957W WO2020114520A1 WO 2020114520 A1 WO2020114520 A1 WO 2020114520A1 CN 2019124957 W CN2019124957 W CN 2019124957W WO 2020114520 A1 WO2020114520 A1 WO 2020114520A1
Authority
WO
WIPO (PCT)
Prior art keywords
unit
pwm
current
driving unit
signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2019/124957
Other languages
English (en)
French (fr)
Inventor
但志敏
蔡金博
陈美林
侯贻真
张伟
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Contemporary Amperex Technology Co Ltd
Original Assignee
Contemporary Amperex Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Contemporary Amperex Technology Co Ltd filed Critical Contemporary Amperex Technology Co Ltd
Publication of WO2020114520A1 publication Critical patent/WO2020114520A1/zh
Priority to US17/123,022 priority Critical patent/US20210184486A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering
    • H02J7/345—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering using capacitors as storage or buffering devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/90—Regulation of charging or discharging current or voltage
    • H02J7/927—Regulation of charging or discharging current or voltage with introduction of pulses during the charging process
    • 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
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • 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
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/855—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2207/00—Details of circuit arrangements for charging or discharging batteries or supplying loads from batteries
    • H02J2207/50—Charging of capacitors, supercapacitors, ultra-capacitors 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
    • 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

Definitions

  • the embodiments of the present application relate to the technical field of circuits, and in particular, to a precharge circuit and a precharge method.
  • the current main processing method is to use the pre The charging circuit pre-charges the main circuit before the main relay is closed to reduce the voltage difference between the battery and the load capacitor when the main relay is closed, thereby reducing the instantaneous current when the main circuit is turned on, thereby reducing the failure rate of the main relay And improve circuit performance.
  • the precharge circuit in the battery management system usually consists of a large number of current limiting resistors, and the precharge time is long. At the same time, a large number of current-limiting resistors occupy a large part of the PCBA board area. The thermal power consumption of the current-limiting resistors is large.
  • the PCBA with the current-limiting resistor needs special heat treatment.
  • the shell of the PCBA with the current-limiting resistor needs to reserve space for heat conduction. The pad allows the heat of the current limiting resistor to dissipate heat through the housing, increasing the cost.
  • the purpose of the embodiments of the present application is to provide a precharge circuit and a precharge method, which can adjust the precharge time of the load capacitance of the battery management circuit according to need.
  • the embodiments of the present application provide a pre-charging circuit, including: a controller, a PWM control unit, and a drive unit; the controller and the PWM control unit are respectively connected to the drive unit, and the drive unit is connected to the battery management system
  • the main switch of the circuit the PWM control unit is used to detect the current in the battery management system circuit when the main switch is closed; the PWM control unit is also used to output a control signal to the drive unit according to the current; the controller is used to output a preset PWM signal to the drive unit
  • the drive unit is used to control the main switch to open or close according to the received control signal and PWM signal to pre-charge the load capacitance of the battery management system circuit when the main switch is closed.
  • the embodiment of the present application also provides a pre-charging method, which is applied to a pre-charging circuit.
  • the pre-charging circuit includes a controller, a PWM control unit, and a driving unit; the controller and the PWM control unit are respectively connected to the driving unit, and the driving unit is connected to The main switch of the battery management system circuit; the method includes: detecting the current in the battery management system circuit when the main switch is closed by the PWM control unit, and outputting the control signal to the driving unit according to the current through the PWM control unit; outputting the preset PWM through the controller
  • the signal is sent to the drive unit; the drive unit controls the main switch to open or close according to the received control signal and PWM signal to pre-charge the load capacitance of the battery management system circuit when the main switch is closed.
  • the PWM control unit can detect the current in the battery management system circuit when the main switch of the battery management system circuit is closed, and output a control signal to the driving unit according to the current, and the controller outputs a preset The PWM signal is sent to the drive unit.
  • the drive unit controls the main switch to open or close according to the received control signal and the PWM signal. When the main switch is closed, it can precharge the load capacitance of the battery management system circuit.
  • the PWM control unit outputs a control signal to the drive unit, and the controller outputs a PWM signal to the drive unit, so that the drive unit can control the on and off of the main switch according to the control signal and the PWM signal to realize the pre-charging of the load capacitor.
  • the existing precharge circuit reduces the cost consumption; at the same time, by adjusting the PWM signal output by the controller to adjust the precharge time of the load capacitor, the precharge time of the load capacitor of the battery management circuit can be adjusted as needed to achieve fast Precharge.
  • the PWM control unit is specifically used to output a low-level control signal to the driving unit when the current is greater than a preset current threshold, and to stop outputting a low-level control signal when the current is less than or equal to the preset current threshold
  • the drive unit is specifically used to control the main switch to be turned off when the low-level control signal and the PWM signal are received, and to control the main when the low-level control signal is not received and the PWM signal is high
  • the switch is closed to pre-charge the load capacitance of the battery management system circuit.
  • the PWM control unit when the current in the battery management system circuit is greater than the preset current threshold when the main switch is closed, the PWM control unit outputs a low-level control signal to the drive unit, and the controller outputs the PWM signal to the drive unit.
  • the drive unit controls the main switch to turn off; when the current is less than or equal to the current threshold, the PWM control unit stops outputting low-level control signals to the drive unit, and the controller outputs PWM signals to the drive unit.
  • the PWM signal is used to control the on and off of the main switch.
  • the drive unit controls the main switch to close to realize the precharge of the load capacitor, thereby protecting the load management system circuit and the load capacitor. Precharge.
  • the PWM control unit includes a sampling unit, a PWM output unit and a semiconductor switch connected in sequence, the semiconductor switch is connected to the drive unit; the sampling unit is used to detect the current in the battery management system circuit when the main switch is closed; the PWM output unit is used to When it is greater than the preset current threshold, the semiconductor switch outputs a low-level control signal to the driving unit, and when the current is less than or equal to the preset current threshold, the semiconductor switch stops outputting the low-level control signal to the driving unit.
  • This embodiment provides a specific implementation manner of the PWM control unit.
  • the precharge circuit also includes a high-voltage sampling unit connected to the PWM control unit and the controller; the high-voltage sampling unit is used to detect the voltage across the load capacitor; the PWM control unit is also used to achieve a preset voltage threshold across the load capacitor At this time, stop outputting the control signal to the driving unit; the controller is used to stop outputting the PWM signal when the voltage across the load capacitor reaches the preset voltage threshold, and output the high-level electrical signal to the driving unit.
  • the voltage across the load capacitor is detected by the high-voltage sampling unit, so that when the voltage across the load capacitor reaches a preset voltage threshold, the battery management system circuit can be controlled to start working normally.
  • the sampling unit is specifically used to collect the voltage across the shunt in the battery management system circuit, and calculate the current based on the resistance of the shunt and the voltage across the shunt.
  • This embodiment provides a specific implementation manner in which the sampling unit detects the current in the battery management system circuit when the main switch is closed.
  • the PWM output unit is specifically used to output a high-level electrical signal to turn on the semiconductor switch when the current is greater than a preset current threshold to output a low-level control signal to the drive unit; the PWM output unit is specifically used to When it is less than or equal to the preset current threshold, outputting a low-level electrical signal turns off the semiconductor switch to stop outputting a low-level control signal to the driving unit.
  • the main switch is a semiconductor power switch.
  • the semiconductor power switch is used as the main switch to reduce the failure rate of the main switch.
  • the semiconductor power switch is an insulated gate bipolar transistor IGBT or a metal oxide semiconductor field effect transistor MOSFET. This embodiment provides a specific type of semiconductor power switch.
  • FIG. 1 is a structural diagram of a battery management system circuit according to the first embodiment of the present application
  • FIG. 2 is a block diagram of a pre-charging circuit according to the first embodiment of the present application
  • FIG. 3 is a block schematic diagram of a pre-charging circuit according to a third embodiment of the present application.
  • FIG. 4 is a structural diagram of a battery management system circuit according to a third embodiment of the present application.
  • FIG. 5 is a schematic diagram of a PWM signal according to the third embodiment of the present application.
  • FIG. 6 is a schematic diagram of a signal coupled to an input terminal IN of a driving unit according to a third embodiment of the present application.
  • FIG. 7 is a block diagram of a pre-charging circuit according to the fourth embodiment of the present application.
  • FIG. 8 is a specific flowchart of a precharge method according to a fifth embodiment of the present application.
  • FIG. 9 is a specific flowchart of a precharge method according to a sixth embodiment of the present application.
  • FIG. 10 is a specific flowchart of a pre-charging method according to a seventh embodiment of the present application.
  • FIG. 11 is a specific flowchart of a precharge method according to an eighth embodiment of the present application.
  • the first embodiment of the present application relates to a pre-charging circuit for pre-charging load capacitance in a battery management system circuit.
  • the battery management system circuit includes a battery pack V1, parasitic inductances L1 to L4, and a main Positive switch S1, main negative switch S2, anti-reverse switch S3, X capacitor C1, protection capacitors C2 and C3, current storage diodes D1 and D2, and load capacitor C4.
  • the precharge circuit includes: a controller 1, a PWM control unit 2 and a drive unit 3; the controller 1 and the PWM control unit 2 are respectively connected to the drive unit 3, and the drive unit 3 is connected to the main switch of the battery management system circuit
  • the main switch may be the main positive switch S1 or the main negative switch S2.
  • the main switch is the main positive switch S1 as an example for description.
  • the main switch is a semiconductor power switch, which can reduce the failure rate of the main switch.
  • the semiconductor power switch may be an insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, referred to as IGBT), or a metal oxide semiconductor field effect transistor (Metal-Oxide-Semiconductor Field-Effect Transistor, referred to as MOSFET).
  • IGBT Insulated Gate Bipolar Transistor
  • MOSFET Metal oxide semiconductor field effect transistor
  • the PWM control unit 2 is used to detect the current in the battery management system circuit when the main switch is closed, and output a control signal to the drive unit 3 according to the current.
  • the controller 1 is used to output a preset PWM signal to the driving unit 3, and the PWM signal may be a signal with a fixed pulse width or a signal with a gradually varying pulse width.
  • the driving unit 3 is used to control the main switch of the battery management system circuit to open or close according to the received control signal and PWM signal. Specifically, the driving unit 3 is based on the control signal and PWM signal coupled to its input terminal IN. A control signal is output through the output terminal OUT to control the main switch to open or close, and to pre-charge the load capacitor C4 of the battery management system circuit when the main switch is closed.
  • the controller 1 is also connected to the main negative switch S2 and the anti-reverse switch S3. Before pre-charging the load capacitor C4, the controller 1 will output a continuous high-level signal to the main negative switch S2 and the anti-reverse Switch S3, so that the main negative switch S2 and the anti-reverse switch S3 are closed; in addition, if the main negative switch S2 is the main switch, the controller 1 will output a continuous high level signal before precharging the load capacitor C4 To the main positive switch S1 and the anti-reverse switch S3, so that the main positive switch S1 and the anti-reverse switch S3 are closed.
  • the PWM control unit can detect the current in the battery management system circuit when the main switch of the battery management system circuit is closed, and output a control signal to the driving unit according to the current, and the controller outputs a preset The PWM signal is sent to the driving unit.
  • the driving unit controls the main switch to open or close according to the received control signal and the PWM signal. When the main switch is closed, it can precharge the load capacitance of the battery management system circuit.
  • the PWM control unit outputs a control signal to the drive unit, and the controller outputs a PWM signal to the drive unit, so that the drive unit can control the on and off of the main switch according to the control signal and the PWM signal to realize the pre-charging of the load capacitor.
  • the existing precharge circuit reduces the cost consumption; at the same time, by adjusting the PWM signal output by the controller to adjust the precharge time of the load capacitor, the precharge time of the load capacitor of the battery management circuit can be adjusted as needed to achieve fast Precharge.
  • the second embodiment of the present application relates to a pre-charging circuit.
  • This embodiment is substantially the same as the first embodiment. The main difference is that this embodiment provides specific implementations of the controller 1, the PWM control unit 2, and the drive unit 3. the way.
  • the PWM control unit 2 is specifically used to output a low-level control signal to the driving unit 3 when the current is greater than the preset current threshold, and when the current is less than or equal to the preset current threshold, Stop outputting a low-level control signal to the driving unit 3.
  • the controller 1 is specifically used to output a high-level PWM signal to the driving unit when the current is greater than a preset current threshold, and output a PWM signal with an adjustable pulse width to the driving unit when the current is less than or equal to the current threshold;
  • the driving unit 3 is specifically used to control the main switch to open when the low level control signal and the PWM signal are received, and to control the main switch to close when the low level control signal is not received and the PWM signal is high level. To pre-charge the load capacitance of the battery management system circuit.
  • the battery management system circuit has a safe current value (that is, the preset current Threshold).
  • the PWM control unit 2 When the PWM control unit 2 detects that the current in the battery management system circuit is greater than the preset current threshold when the main switch is closed, the PWM control unit 2 outputs a low-level control signal to the drive unit 3, and the controller 1 outputs the PWM signal to the drive Unit 3, at this time, the PWM signal output by the controller 1 to the driving unit 3 is pulled down by the low-level control signal, the signal coupled to the input terminal of the driving unit 3 is 0, the driving unit 3 controls the main switch to be turned off, and the battery management system The load capacitance C4 of the circuit is not pre-charged.
  • the PWM control unit 2 detects that the current in the battery management system circuit is less than or equal to the preset current threshold when the main switch is closed, the PWM control unit 2 stops outputting the low-level control signal to the driving unit 3, and the controller 1 outputs the PWM signal To the drive unit 3, the input of the drive unit 3 is only determined by the PWM signal output by the controller 1, when the PWM signal is at a high level, the drive unit 3 controls the main switch to be closed for the load capacitance C4 of the battery management system circuit Pre-charging. When the PWM signal is at a low level, the driving unit 3 controls the main switch to turn off, and stops pre-charging the load capacitor C4. When the next high level of the PWM signal comes, the above process is repeated.
  • the PWM control unit when the current in the battery management system circuit is greater than the preset current threshold when the main switch is closed, the PWM control unit outputs a low-level control signal to the drive unit, and the controller outputs PWM Signal to the drive unit, the signal coupled to the drive unit is 0 at this time, the drive unit controls the main switch to open; when the current is less than or equal to the current threshold, the PWM control unit stops outputting low-level control signals to the drive unit, the controller Output the PWM signal to the drive unit. At this time, the PWM signal controls the on and off of the main switch. When the PWM signal is at a high level, the drive unit controls the main switch to close to realize the precharge of the load capacitor, thereby protecting the battery management system circuit. At the same time to achieve the pre-charge of the load capacitor.
  • the third embodiment of the present application relates to a pre-charging circuit.
  • This embodiment is substantially the same as the second embodiment.
  • the main difference is that in this embodiment, please refer to FIGS. 3 and 4.
  • the PWM control unit 2 includes sequentially connected The sampling unit 21, the PWM output unit 22, and the semiconductor switch S4.
  • the sampling unit 21 is used to detect the current in the battery management system circuit when the main switch is closed. Specifically, the sampling unit 21 can collect the voltage across the shunt Rf in the battery management system circuit, and calculate the current in the battery management system circuit when the main switch is closed according to the resistance value of the shunt Rf and the voltage across the shunt Rf.
  • the PWM output unit 22 is used to output a low-level control signal to the driving unit 3 through the semiconductor switch S4 when the current is greater than the preset current threshold, and to stop through the semiconductor switch S4 when the current is less than or equal to the preset current threshold A low-level control signal is output to the driving unit 3.
  • the controller 1 clock outputs a preset PWM signal to the driving unit, and a current limiting resistor R1 is generally connected in series between the controller 1 and the driving unit 3; the sampling unit 21 detects the battery management when the main switch is closed The current in the system circuit, when the current in the battery management system circuit is greater than the preset current threshold when the main switch is closed, the PWM output unit 22 outputs a high-level electrical signal to the semiconductor switch S4, and the semiconductor switch S4 is turned on to output A low-level control signal is sent to the drive unit 3. At this time, the PWM signal from the controller 1 to the drive unit 3 is pulled down by the low-level control signal.
  • the signal coupled to the input of the drive unit 3 is 0
  • the main switch is controlled to be turned off, and the load capacitor C4 of the battery management system circuit is not pre-charged.
  • the PWM output unit 22 outputs a low-level electrical signal to the semiconductor switch S4, the semiconductor switch S4 is turned off, and the control to output the low level is stopped
  • the signal is sent to the drive unit 3.
  • the input of the drive unit 3 is determined only by the PWM signal output by the controller 1.
  • the drive unit 3 controls the main switch to close, which is the load capacitance C4 of the battery management system circuit Pre-charging is performed.
  • FIG. 5 shows that the PWM signal has a fixed pulse width
  • FIG. 6 shows the signal coupled to the input IN of the driving unit 3.
  • this embodiment provides a specific implementation manner of the PWM control unit.
  • the fourth embodiment of the present application relates to a precharge circuit.
  • the fourth embodiment is an improvement on the basis of the third embodiment.
  • the main improvement lies in: please refer to FIG. 7, the precharge circuit further includes a PWM control unit 2 and the high-voltage sampling unit 4 of the controller 1, specifically, the high-voltage sampling unit 4 is connected to the PWM output unit 22 of the PWM control unit 2.
  • the high-voltage sampling unit 4 is used to detect the voltage across the load capacitor C4.
  • the voltage threshold is, for example, 95% of the battery pack V1 voltage U V1 , that is, when it is detected that the voltage across the load capacitor C4 reaches 95% of the battery voltage U V1 , the pre-charging of the load capacitor C4 is stopped.
  • the high-voltage sampling unit 4 is a separate unit as an example for description, but it is not limited to this, and the high-voltage sampling unit 4 may also be used as a part of the PWM control unit 2.
  • this embodiment uses a high-voltage sampling unit to detect the voltage across the load capacitor and a high-voltage sampling unit to detect the voltage across the load capacitor, so that when the voltage across the load capacitor reaches a preset voltage threshold, Control the battery management system circuit to start working normally.
  • the fifth embodiment of the present application relates to a precharge method, which is applied to the precharge circuit in the first embodiment.
  • the schematic diagram of the precharge circuit is shown in FIG. 2.
  • the pre-charging method of this embodiment is used to pre-charge the load capacitance in the battery management system circuit shown in FIG. 1.
  • the battery management system circuit includes a battery pack V1, parasitic inductances L1 to L4, a main positive switch S1, and a main negative switch S2, anti-reverse switch S3, X capacitor C1, protection capacitors C2 and C3, current storage diodes D1 and D2, and load capacitor C4. Please refer to FIG.
  • the precharge circuit includes: a controller 1, a PWM control unit 2 and a drive unit 3; the controller 1 and the PWM control unit 2 are respectively connected to the drive unit 3, and the drive unit 3 is connected to the main switch of the battery management system circuit
  • the main switch may be the main positive switch S1 or the main negative switch S2.
  • the main switch is the main positive switch S1 as an example for description.
  • the main switch is a semiconductor power switch, which can reduce the failure rate of the main switch.
  • the semiconductor power switch may be an insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, referred to as IGBT), or a metal oxide semiconductor field effect transistor (Metal-Oxide-Semiconductor Field-Effect Transistor, referred to as MOSFET).
  • IGBT Insulated Gate Bipolar Transistor
  • MOSFET Metal oxide semiconductor field effect transistor
  • Step 101 The PWM control unit detects the current in the battery management system circuit when the main switch is closed, and outputs the control signal to the drive unit according to the current through the PWM control unit.
  • the PWM control unit 2 can detect the instantaneous current generated in the battery management system circuit when the main switch in the battery management system circuit is closed, and output a control signal to the drive unit 3 according to the instantaneous current.
  • Step 102 The controller outputs a preset PWM signal to the driving unit.
  • the controller 1 continuously outputs a preset PWM signal to the driving unit 3, and the PWM signal may be a signal with a fixed pulse width or a signal with a gradually varying pulse width.
  • Step 103 The driving unit controls the main switch to open or close according to the received control signal and PWM signal, so as to precharge the load capacitance of the battery management system circuit when the main switch is closed.
  • the driving unit 3 outputs a control signal through the output terminal OUT according to the control signal and the PWM signal coupled to its input terminal IN to control the main switch to open or close.
  • the main switch When the main switch is closed, it is The load capacitor C4 is pre-charged.
  • controller 1 is also connected to the main negative switch S2 and the anti-reverse switch S3. Before pre-charging the load capacitor C4, the controller 1 will output a continuous high-level signal to the main negative switch S2 and the anti-reverse Switch S3 to close the main negative switch S2 and the anti-reverse switch S3.
  • the first embodiment corresponds to this embodiment, this embodiment can be implemented in cooperation with the first embodiment.
  • the relevant technical details mentioned in the first embodiment are still valid in this embodiment, and the technical effects that can be achieved in the first embodiment can also be achieved in this embodiment. In order to reduce repetition, they are not repeated here. Correspondingly, the relevant technical details mentioned in this embodiment can also be applied in the first embodiment.
  • the PWM control unit can detect the current in the battery management system circuit when the main switch of the battery management system circuit is closed, and output a control signal to the driving unit according to the current, and the controller outputs a preset The PWM signal is sent to the driving unit.
  • the driving unit controls the main switch to open or close according to the received control signal and the PWM signal. When the main switch is closed, it can precharge the load capacitance of the battery management system circuit.
  • the PWM control unit outputs a control signal to the drive unit, and the controller outputs a PWM signal to the drive unit, so that the drive unit can control the on and off of the main switch according to the control signal and the PWM signal to realize the pre-charging of the load capacitor.
  • the existing precharge circuit reduces the cost consumption; at the same time, by adjusting the PWM signal output by the controller to adjust the precharge time of the load capacitor, the precharge time of the load capacitor of the battery management circuit can be adjusted as needed to achieve fast Precharge.
  • the sixth embodiment of the present application relates to a pre-charging method.
  • This embodiment is substantially the same as the fifth embodiment, and the main difference is that specific methods of step 101 and step 103 in the fifth embodiment are provided.
  • Step 201 When the current is greater than a preset current threshold, the PWM control unit outputs a low-level control signal to the driving unit, and when the current is less than or equal to the current threshold, it stops outputting the low-level control signal to the driving unit.
  • Step 202 The controller outputs a preset PWM signal to the driving unit.
  • Step 203 when the low-level control signal and the PWM signal are received, the driving unit controls the main switch to be turned off, and when the low-level control signal is not received and the PWM signal is at a high level, the driving unit controls the main switch The switch is closed to pre-charge the load capacitance of the battery management system circuit.
  • the battery management system circuit has a safe current value (that is, the preset current Threshold).
  • the PWM control unit 2 When the PWM control unit 2 detects that the current in the battery management system circuit is greater than the preset current threshold when the main switch is closed, the PWM control unit 2 outputs a low-level control signal to the drive unit 3, and the controller 1 outputs the PWM signal to the drive Unit 3, at this time, the PWM signal output by the controller 1 to the driving unit 3 is pulled down by the low-level control signal, the signal coupled to the input terminal of the driving unit 3 is 0, the driving unit 3 controls the main switch to be turned off, and the battery management system The load capacitance C4 of the circuit is not pre-charged.
  • the PWM control unit 2 detects that the current in the battery management system circuit is less than or equal to the preset current threshold when the main switch is closed, the PWM control unit 2 stops outputting the low-level control signal to the driving unit 3, and the controller 1 outputs the PWM signal To the drive unit 3, the input of the drive unit 3 is only determined by the PWM signal output by the controller 1, when the PWM signal is at a high level, the drive unit 3 controls the main switch to be closed for the load capacitance C4 of the battery management system circuit Pre-charging. When the PWM signal is at a low level, the driving unit 3 controls the main switch to turn off, and stops pre-charging the load capacitor C4. When the next high level of the PWM signal comes, the above process is repeated.
  • the second embodiment corresponds to this embodiment, this embodiment can be implemented in cooperation with the second embodiment.
  • the relevant technical details mentioned in the second embodiment are still valid in this embodiment, and the technical effects that can be achieved in the second embodiment can also be achieved in this embodiment. In order to reduce repetition, they are not repeated here. Correspondingly, the relevant technical details mentioned in this embodiment can also be applied in the second embodiment.
  • the PWM control unit when the current in the battery management system circuit is greater than the preset current threshold when the main switch is closed, the PWM control unit outputs a low-level control signal to the drive unit, and the controller outputs PWM Signal to the drive unit, the signal coupled to the drive unit is 0 at this time, the drive unit controls the main switch to open; when the current is less than or equal to the current threshold, the PWM control unit stops outputting low-level control signals to the drive unit, the controller Output the PWM signal to the drive unit. At this time, the PWM signal controls the on and off of the main switch. When the PWM signal is at a high level, the drive unit controls the main switch to close to realize the precharge of the load capacitor, thereby protecting the battery management system circuit. At the same time to achieve the pre-charge of the load capacitor.
  • the seventh embodiment of the present application relates to a pre-charging method.
  • This embodiment is substantially the same as the fifth embodiment.
  • the main difference is that it provides the PWM control unit to detect the current in the battery management system circuit when the main switch is closed.
  • the precharge method of this embodiment is applied to the precharge circuit in the third embodiment.
  • the schematic diagram of the precharge circuit is shown in FIG. 3, and the circuit of the battery management system is shown in FIG.
  • Step 301 includes the following sub-steps:
  • Sub-step 3011 the current in the circuit of the battery management system is detected by the sampling unit when the main switch is closed.
  • Sub-step 3012 when the current is greater than the preset current threshold, the PWM output unit is controlled to output a low-level control signal to the driving unit through the semiconductor switch, and when the current is less than or equal to the preset current threshold, the PWM output unit is controlled to pass The semiconductor switch stops outputting a low-level control signal to the driving unit.
  • Step 302 The controller outputs a preset PWM signal to the driving unit.
  • Step 303 when the low-level control signal and the PWM signal are received, the main switch is turned off by the driving unit, and when the low-level control signal is not received and the PWM signal is at a high level, the main unit is controlled by the driving unit The switch is closed to pre-charge the load capacitance of the battery management system circuit.
  • the controller 1 clock outputs a preset PWM signal to the driving unit, and a current limiting resistor R1 is generally connected in series between the controller 1 and the driving unit 3; sampling The unit 21 detects the current in the battery management system circuit when the main switch is closed.
  • the PWM output unit 22 When the current in the battery management system circuit is greater than the preset current threshold when the main switch is closed, the PWM output unit 22 outputs a high-level electrical signal to the semiconductor switch S4 , The semiconductor switch S4 is turned on, thereby outputting a low-level control signal to the driving unit 3, at this time, the PWM signal output by the controller 1 to the driving unit 3 is pulled down by the low-level control signal, and coupled to the driving unit 3 The signal at the input is 0, the drive unit 3 controls the main switch to be turned off, and the load capacitor C4 of the battery management system circuit is not precharged.
  • the PWM output unit 22 When the current in the battery management system circuit is less than or equal to the preset current threshold when the main switch is closed, the PWM output unit 22 outputs a low-level electrical signal to the semiconductor switch S4, the semiconductor switch S4 is turned off, and the control to output the low level is stopped The signal is sent to the drive unit 3. At this time, the input of the drive unit 3 is determined only by the PWM signal output by the controller 1.
  • the drive unit 3 controls the main switch to close, which is the load capacitance C4 of the battery management system circuit Pre-charging is performed.
  • the driving unit 3 controls the main switch to be turned off and stops pre-charging the load capacitor C4. When the next high level of the PWM signal comes, the above process is repeated.
  • the third embodiment corresponds to this embodiment, this embodiment can be implemented in cooperation with the third embodiment.
  • the relevant technical details mentioned in the third embodiment are still valid in this embodiment, and the technical effects that can be achieved in the third embodiment can also be achieved in this embodiment. In order to reduce repetition, they are not repeated here. Correspondingly, the related technical details mentioned in this embodiment can also be applied in the third embodiment.
  • this embodiment provides a specific implementation manner in which the PWM control unit detects the current in the battery management system circuit when the main switch is closed, and outputs a control signal to the drive unit according to the current.
  • the eighth embodiment of the present application relates to a pre-charging method.
  • This embodiment is an improvement based on the seventh embodiment.
  • the main improvement lies in: judging whether the load capacitor is pre-charged by detecting the voltage across the load capacitor carry out.
  • the precharge method of this embodiment is applied to the precharge circuit in the fourth embodiment.
  • the schematic diagram of the precharge circuit is shown in FIG. 6.
  • Steps 401 to 403 are substantially the same as steps 301 to 303, and are not repeated here.
  • the main difference is that steps 404 to 406 are added as follows:
  • step 404 the voltage across the load capacitor is detected by the high-voltage sampling unit.
  • Step 405 When the voltage across the load capacitor reaches a preset voltage threshold, the PWM control unit stops outputting the control signal to the driving unit.
  • Step 406 When the voltage across the load capacitor reaches a preset voltage threshold, stop outputting the PWM signal through the controller, and output a high-level electrical signal through the controller to the driving unit.
  • the high-voltage sampling unit 4 can detect the voltage across the load capacitor C4.
  • the voltage across the load capacitor C4 will gradually increase.
  • the instantaneous current generated by the battery management system circuit when the main switch is closed Will gradually decrease, the voltage across the load capacitor C4 is the instantaneous voltage value before the main switch is turned off; during the pre-charging process of the load capacitor C4, the voltage across the load capacitor C4 changes Current changes in the battery management system circuit
  • R is the equivalent impedance of the battery management system circuit
  • C is the load capacitor C4 capacitance value
  • t represents the precharge time.
  • the voltage threshold is, for example, 95% of the battery pack V1 voltage U V1 , that is, when it is detected that the voltage across the load capacitor C4 reaches 95% of the battery voltage U V1 , the pre-charging of the load capacitor C4 is stopped.
  • the fourth embodiment corresponds to this embodiment, this embodiment can be implemented in cooperation with the fourth embodiment.
  • the relevant technical details mentioned in the fourth embodiment are still valid in this embodiment, and the technical effects that can be achieved in the fourth embodiment can also be achieved in this embodiment. In order to reduce repetition, they are not repeated here. Correspondingly, the relevant technical details mentioned in this embodiment can also be applied in the fourth embodiment.
  • this embodiment uses the high-voltage sampling unit to detect the voltage across the load capacitor and the high-voltage sampling unit to detect the voltage across the load capacitor, so that when the voltage across the load capacitor reaches a preset voltage threshold, Control the battery management system circuit to start working normally.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Dc-Dc Converters (AREA)

Abstract

一种预充电路与预充方法。预充电路，包括：控制器(1)、PWM控制单元(2)以及驱动单元(3)；控制器(1)与PWM控制单元(2)分别连接于驱动单元(3)，驱动单元(3)连接于电池管理系统电路的主开关(S1)；PWM控制单元(2)用于检测主开关(S1)闭合时电池管理系统电路中的电流；PWM控制单元(2)还用于根据电流输出控制信号至驱动单元(3)；控制器(1)用于输出预设的PWM信号至驱动单元 (3)；驱动单元(3)用于根据接收到的控制信号与PWM信号，控制主开关(S1)断开或者闭合，以在主开关(S1)闭合时为电池管理系统电路的负载电容(C4)进行预充电。该预充电路与预充方法能够根据需要调节电池管理电路的负载电容(C4)的预充时间，以实现快速预充。

Description

预充电路与预充方法
交叉引用
本申请引用于2018年12月04日递交的名称为“预充电路与预充方法”的第201811474762.X号中国专利申请，其通过引用被全部并入本申请。
技术领域
本申请实施例涉及电路技术领域，特别涉及一种预充电路与预充方法。
背景技术
在新能源车辆的电池管理系统中，当电池负载端电容值比较大，在主继电器闭合瞬时，回路电流将会快速上升，为了减小主继电器闭合时的瞬时电流，目前主要处理方式是采用预充回路在主继电器闭合前对主回路进行预充，以减小主继电器闭合时电池与负载电容之间的电压差，从而降低主回路导通时的瞬时电流，进而可降低主继电器的失效率和提升电路性能。
发明人发现现有技术中至少存在如下问题：电池管理系统中的预充回路通常由大量的限流电阻组成，预充时间长。同时大量的限流电阻占据很大一部分PCBA板面积，限流电阻的热功耗大，贴有限流电阻的PCBA需要做特殊散热处理，贴有限流电阻的PCBA的外壳需要预留空间贴装导热垫使限流电阻热量能通过外壳散热，增加了成本。
发明内容
本申请实施例的目的在于提供一种预充电路与预充方法，能够根据需要调节电池管理电路的负载电容的预充时间。
为解决上述技术问题，本申请的实施例提供了一种预充电路，包括：控制器、PWM控制单元以及驱动单元；控制器与PWM控制单元分别连接于驱动单元，驱动单元连接于电池管理系统电路的主开关；PWM控制单元用于检测主开关闭合时电池管理系统电路中的电流；PWM控制单元还用于根据电流输出控制信号至驱动单元；控制器用于输出预设的PWM信号至驱动单元；驱动单元用于根据接收到的控制信号与PWM信号，控制主开关断开或者 闭合，以在主开关闭合时为电池管理系统电路的负载电容进行预充电。
本申请的实施例还提供了一种预充方法，应用于预充电路，预充电路包括控制器、PWM控制单元以及驱动单元；控制器与PWM控制单元分别连接于驱动单元，驱动单元连接于电池管理系统电路的主开关；方法包括：通过PWM控制单元检测主开关闭合时电池管理系统电路中的电流，并通过PWM控制单元根据电流输出控制信号至驱动单元；通过控制器输出预设的PWM信号至驱动单元；通过驱动单元根据接收到的控制信号与PWM信号，控制主开关断开或者闭合，以在主开关闭合时为电池管理系统电路的负载电容进行预充电。
本申请实施例相对于现有技术而言，PWM控制单元能够检测电池管理系统电路的主开关闭合时电池管理系统电路中的电流，并根据该电流输出控制信号至驱动单元，控制器输出预设的PWM信号至驱动单元，驱动单元根据接收到的控制信号与PWM信号控制主开关断开或者闭合，在主开关闭合时能够为电池管理系统电路的负载电容进行预充电。本申请中，PWM控制单元输出控制信号至驱动单元、控制器输出PWM信号至驱动单元，从而驱动单元可以根据控制信号与PWM信号来控制主开关的通断实现对负载电容的预充电，相对于现有的预充回路减少了成本消耗；同时，通过对控制器输出的PWM信号的调整来调节负载电容的预充时间，能够根据需要调节电池管理电路的负载电容的预充时间，以实现快速预充。
另外，PWM控制单元具体用于在电流大于预设的电流阈值时，输出低电平的控制信号至驱动单元，并在电流小于或等于预设的电流阈值时，停止输出低电平的控制信号至驱动单元；驱动单元具体用于在接收到低电平的控制信号与PWM信号时，控制主开关断开，并在未接收到低电平的控制信号且PWM信号为高电平时，控制主开关闭合，以为电池管理系统电路的负载电容进行预充电。本实施例中，在主开关闭合时电池管理系统电路中的电流大于预设的电流阈值时，PWM控制单元输出低电平的控制信号至驱动单元，控制器输出PWM信号至驱动单元，此时耦合到驱动单元的信号为0，驱动单元控制主开关断开；在电流小于或等于电流阈值时，PWM控制单元停止输出低电平的控制信号至驱动单元，控制器输出PWM信号至驱动单元，此时由PWM信号来控制主开关的通断，在PWM信号处于高电平时，驱动单元控制主开关闭合来实现对负载电容的预充，从而在保护电池管理系统电路的同时实现对负载电容的预充。
另外，PWM控制单元包括依次连接的采样单元、PWM输出单元以及半导体开关，半导体开关连接于驱动单元；采样单元用于检测主开关闭合时电池管理系统电路中的电流；PWM输出单元用于在电流大于预设的电流阈值时，通过半导体开关输出低电平的控制信号至驱动单元，并在电流小于或等于预设的电流阈值时，通过半导体开关停止输出低电平的控制 信号至驱动单元。本实施例提供了一种PWM控制单元的具体实现方式。
另外，预充电路还包括连接于PWM控制单元与控制器的高压采样单元；高压采样单元用于检测负载电容两端的电压；PWM控制单元还用于在负载电容两端的电压达到预设的电压阈值时，停止输出控制信号至驱动单元；控制器用于在负载电容两端的电压达到预设的电压阈值时，停止输出PWM信号，并输出高电平的电信号至驱动单元。本实施例中，通过高压采样单元检测负载电容两端的电压，从而能够在负载电容两端的电压达到预设的电压阈值时，控制电池管理系统电路开始正常工作。
另外，采样单元具体用于采集电池管理系统电路中的分流器两端的电压，并根据分流器的阻值与分流器两端的电压计算得到电流。本实施例提供了一种采样单元检测主开关闭合时电池管理系统电路中的电流的具体实现方式。
另外，PWM输出单元具体用于在电流大于预设的电流阈值时，输出高电平的电信号导通半导体开关，以输出低电平的控制信号至驱动单元；PWM输出单元具体用于在电流小于或等于预设的电流阈值时，输出低电平的电信号截止半导体开关，以停止输出低电平的控制信号至驱动单元。
另外，主开关为半导体功率开关。本实施例中，使用半导体功率开关作为主开关，减小了主开关的失效率。
另外，半导体功率开关为绝缘栅双极型晶体管IGBT或金属氧化物半导体场效应晶体管MOSFET。本实施例提供了半导体功率开关的具体类型。
附图说明
一个或多个实施例通过与之对应的附图中的图片进行示例性说明，这些示例性说明并不构成对实施例的限定，附图中具有相同参考数字标号的元件表示为类似的元件，除非有特别申明，附图中的图不构成比例限制。
图1是根据本申请第一实施例中的电池管理系统电路的结构图；
图2是根据本申请第一实施例中的预充电路的方框示意图
图3是根据本申请第三实施例中的预充电路的方框示意图；
图4是根据本申请第三实施例中的电池管理系统电路的结构图；
图5是根据本申请第三实施例中的PWM信号的示意图；
图6是根据本申请第三实施例中的耦合到驱动单元输入端IN的信号的示意图；
图7是根据本申请第四实施例中的预充电路的方框示意图；
图8是根据本申请第五实施例的预充方法的具体流程图；
图9是根据本申请第六实施例的预充方法的具体流程图；
图10是根据本申请第七实施例的预充方法的具体流程图；
图11是根据本申请第八实施例的预充方法的具体流程图。
具体实施例
为使本申请实施例的目的、技术方案和优点更加清楚，下面将结合附图对本申请的各实施例进行详细的阐述。然而，本领域的普通技术人员可以理解，在本申请各实施例中，为了使读者更好地理解本申请而提出了许多技术细节。但是，即使没有这些技术细节和基于以下各实施例的种种变化和修改，也可以实现本申请所要求保护的技术方案。
本申请的第一实施例涉及一种预充电路，用于给电池管理系统电路中的负载电容预充电，如图1所示，电池管理系统电路包括电池组V1、寄生电感L1至L4、主正开关S1、主负开关S2、防反开关S3、X电容C1、保护电容C2与C3、蓄流二极管D1与D2、负载电容C4。
请参考图2，预充电路包括：控制器1、PWM控制单元2以及驱动单元3；控制器1与PWM控制单元2分别连接于驱动单元3，驱动单元3连接于电池管理系统电路的主开关，主开关可以是主正开关S1或主负开关S2，本实施例以及之后的实施例中以主开关为主正开关S1为例进行说明。在一个例子中，主开关为半导体功率开关，能够减小主开关的失效率。半导体功率开关可以为绝缘栅双极型晶体管(Insulated Gate Bipolar Transistor，简称IGBT)，或金属氧化物半导体场效应晶体管(Metal-Oxide-Semiconductor Field-Effect Transistor，简称MOSFET)。
PWM控制单元2用于检测主开关闭合时电池管理系统电路中的电流，并根据该电流输出控制信号至驱动单元3。
控制器1用于输出预设的PWM信号至驱动单元3，该PWM信号可以为脉冲宽度固定的信号，也可以是脉冲宽度逐渐变化的信号。
驱动单元3用于根据接收到的控制信号与PWM信号，控制电池管理系统电路的主开关断开或者闭合，具体的来说，驱动单元3根据耦合到其输入端IN的控制信号与PWM信号，通过输出端OUT输出一个控制信号，来控制主开关断开或者闭合，在主开关闭合时为电池管理系统电路的负载电容C4进行预充电。
需要说明的是，控制器1还连接于主负开关S2与防反开关S3，在对负载电容C4进 行预充电之前，控制器1会输出持续的高电平信号至主负开关S2与防反开关S3，以使主负开关S2与防反开关S3闭合；另外，若以主负开关S2为主开关，则在对负载电容C4进行预充电之前，控制器1会输出持续的高电平信号至主正开关S1与防反开关S3，以使主正开关S1与防反开关S3闭合。
本实施例相对于现有技术而言，PWM控制单元能够检测电池管理系统电路的主开关闭合时电池管理系统电路中的电流，并根据该电流输出控制信号至驱动单元，控制器输出预设的PWM信号至驱动单元，驱动单元根据接收到的控制信号与PWM信号控制主开关断开或者闭合，在主开关闭合时能够为电池管理系统电路的负载电容进行预充电。本申请中，PWM控制单元输出控制信号至驱动单元、控制器输出PWM信号至驱动单元，从而驱动单元可以根据控制信号与PWM信号来控制主开关的通断实现对负载电容的预充电，相对于现有的预充回路减少了成本消耗；同时，通过对控制器输出的PWM信号的调整来调节负载电容的预充时间，能够根据需要调节电池管理电路的负载电容的预充时间，以实现快速预充。
本申请第二实施例涉及一种预充电路，本实施例与第一实施例大致相同，主要区别之处在于：本实施例提供了控制器1、PWM控制单元2与驱动单元3的具体实现方式。
请参考图1与图2，PWM控制单元2具体用于在电流大于预设的电流阈值时，输出低电平的控制信号至驱动单元3，并在电流小于或等于预设的电流阈值时，停止输出低电平的控制信号至驱动单元3。
控制器1具体用于在电流大于预设的电流阈值时，输出高电平的PWM信号至驱动单元，并在电流小于或等于电流阈值时，输出脉冲宽度可调的PWM信号至驱动单元；
驱动单元3具体用于在接收到低电平的控制信号与PWM信号时，控制主开关断开，并在未接收到低电平的控制信号且PWM信号为高电平时，控制主开关闭合，以为电池管理系统电路的负载电容进行预充电。
具体而言，在零状态响应情况下，电池管理系统电路中的主开关闭合时，电池管理系统电路中会产生一个很大的瞬时电流，电池管理系统电路具有安全电流值(即预设的电流阈值)。
PWM控制单元2在检测主开关闭合时电池管理系统电路中的电流大于预设的电流阈值时，PWM控制单元2会输出低电平的控制信号至驱动单元3，控制器1输出PWM信号至驱动单元3，此时控制器1输出到驱动单元3的PWM信号被低电平的控制信号拉低，耦合到驱动单元3的输入端的信号为0，驱动单元3控制主开关断开，电池管理系统电路的负载电容C4未进行预充电。
PWM控制单元2在检测主开关闭合时电池管理系统电路中的电流小于或等于预设的电流阈值时，PWM控制单元2停止输出低电平的控制信号至驱动单元3，控制器1输出PWM信号至驱动单元3，此时驱动单元3的输入仅由控制器1输出的PWM信号来决定，当PWM信号处于高电平时，驱动单元3控制主开关闭合，为电池管理系统电路的负载电容C4进行预充电，在PWM信号处于低电平时，驱动单元3控制主开关断开，停止为负载电容C4预充电。当PWM信号的下一个高电平到来时，重复上述的过程。
本实施例相对于第一实施例而言，在主开关闭合时电池管理系统电路中的电流大于预设的电流阈值时，PWM控制单元输出低电平的控制信号至驱动单元，控制器输出PWM信号至驱动单元，此时耦合到驱动单元的信号为0，驱动单元控制主开关断开；在电流小于或等于电流阈值时，PWM控制单元停止输出低电平的控制信号至驱动单元，控制器输出PWM信号至驱动单元，此时由PWM信号来控制主开关的通断，在PWM信号处于高电平时，驱动单元控制主开关闭合来实现对负载电容的预充，从而在保护电池管理系统电路的同时实现对负载电容的预充。
本申请第三实施例涉及一种预充电路，本实施例与第二实施例大致相同，主要区别之处在于：本实施例中请参考图3与图4，PWM控制单元2包括依次连接的采样单元21、PWM输出单元22以及半导体开关S4。
采样单元21用于检测主开关闭合时电池管理系统电路中的电流。具体的，采样单元21能够采集电池管理系统电路中的分流器Rf两端的电压，并根据分流器Rf的阻值与分流器Rf两端的电压计算得到主开关闭合时电池管理系统电路中的电流。
PWM输出单元22用于在电流大于预设的电流阈值时，通过半导体开关S4输出低电平的控制信号至驱动单元3，并在电流小于或等于预设的电流阈值时，通过半导体开关S4停止输出低电平的控制信号至驱动单元3。
具体的，在预充过程中，控制器1时钟输出预设的PWM信号至驱动单元，控制器1与驱动单元3之间一般还串联有限流电阻R1；采样单元21检测主开关闭合时电池管理系统电路中的电流，在主开关闭合时电池管理系统电路中的电流大于预设的电流阈值时，PWM输出单元22输出高电平的电信号至半导体开关S4，半导体开关S4导通，从而输出一个低电平的控制信号至驱动单元3，此时控制器1输出到驱动单元3的PWM信号被低电平的控制信号拉低，耦合到驱动单元3的输入端的信号为0，驱动单元3控制主开关断开，电池管理系统电路的负载电容C4未进行预充电。在主开关闭合时电池管理系统电路中的电流小于或等于预设的电流阈值时，PWM输出单元22输出低电平的电信号至半导体开关S4，半导体开关 S4截止，停止输出低电平的控制信号至驱动单元3，此时驱动单元3的输入仅由控制器1输出的PWM信号来决定，当PWM信号处于高电平时，驱动单元3控制主开关闭合，为电池管理系统电路的负载电容C4进行预充电，在PWM信号处于低电平时，驱动单元3控制主开关断开，停止为负载电容C4预充电。当PWM信号的下一个高电平到来时，重复上述的过程。如图5与图6所示，图5为PWM信号为脉冲宽度固定的信号，图6为耦合到驱动单元3输入IN的信号。
本实施例相对于第二实施例而言，提供了一种PWM控制单元的具体实现方式。
本申请的第四实施例涉及一种预充电路，第四实施例是在第三实施例基础上的改进，主要改进之处在于：请参考图7，预充电路还包括连接于PWM控制单元2与控制器1的高压采样单元4，具体的，高压采样单元4连接于PWM控制单元2的PWM输出单元22。
本实施例中，高压采样单元4用于检测负载电容C4两端的电压。
在负载电容C4预充电的过程中，负载电容C4两端的电压会逐渐增大，主开关闭合时电池管理系统电路产生的瞬时电流会逐渐减小，负载电容C4两端的电压为主开关断开前瞬时的电压值；在负载电容C4预充过程中，负载电容C4两端电压变化
Figure PCTCN2019124957-appb-000001
电池管理系统电路的电流变化
Figure PCTCN2019124957-appb-000002
其中τ＝R×C，U V1表示电池组V1电压，R为电池管理系统电路的等效阻抗，C为负载电容C4电容值，t表示预充时间。
在负载电容C4预充电的过程中，若负载电容C4两端的电压U C4达到预设的电压阈值，负载电容C4预充电完成，PWM控制单元2的PWM输出单元22通过半导体开关S4停止输出低电平的控制信号至驱动单元3，控制器1停止输出PWM信号，并输出高电平的电信号至驱动单元3，此时驱动单元3仅接收到控制器1输出高电平的电信号，主开关闭合，电池管理系统电路开始正常工作。其中，电压阈值例如为电池组V1电压U V1的95％，即当检测到负载电容C4两端的电压达到电池电压U V1的95％时，停止为负载电容C4预充电。
需要说明的是，本实施例中以高压采样单元4为单独单元存在为例进行说明，然不限于此，高压采样单元4也可以作为PWM控制单元2的一部分。
本实施例相对于第三实施例而言，通过高压采样单元检测负载电容两端的电压，通过高压采样单元检测负载电容两端的电压，从而能够在负载电容两端的电压达到预设的电压阈值时，控制电池管理系统电路开始正常工作。
本申请的第五实施例涉及一种预充方法，应用于第一实施例中的预充电路，预充电路的示意图如图2所示。本实施例的预充方法用于给如图1所示的电池管理系统电路中的负载 电容预充电，电池管理系统电路包括电池组V1、寄生电感L1至L4、主正开关S1、主负开关S2、防反开关S3、X电容C1、保护电容C2与C3、蓄流二极管D1与D2、负载电容C4。请参考图2，预充电路包括：控制器1、PWM控制单元2以及驱动单元3；控制器1与PWM控制单元2分别连接于驱动单元3，驱动单元3连接于电池管理系统电路的主开关，主开关可以是主正开关S1或主负开关S2，本实施例以及之后的实施例中以主开关为主正开关S1为例进行说明。在一个例子中，主开关为半导体功率开关，能够减小主开关的失效率。半导体功率开关可以为绝缘栅双极型晶体管(Insulated Gate Bipolar Transistor，简称IGBT)，或金属氧化物半导体场效应晶体管(Metal-Oxide-Semiconductor Field-Effect Transistor，简称MOSFET)。
本实施例的预充方法具体流程如图8所示。
步骤101，通过PWM控制单元检测主开关闭合时电池管理系统电路中的电流，并通过PWM控制单元根据电流输出控制信号至驱动单元。
具体而言，PWM控制单元2能够检测电池管理系统电路中的主开关闭合时，电池管理系统电路中产生的瞬时电流，并根据该瞬时电流输出控制信号至驱动单元3。
步骤102，通过控制器输出预设的PWM信号至驱动单元。
具体而言，在负载电容C4的预充过程中，控制器1持续输出预设的PWM信号至驱动单元3，该PWM信号可以为脉冲宽度固定的信号，也可以是脉冲宽度逐渐变化的信号。
步骤103，通过驱动单元根据接收到的控制信号与PWM信号，控制主开关断开或者闭合，以在主开关闭合时为电池管理系统电路的负载电容进行预充电。
具体而言，驱动单元3根据耦合到其输入端IN的控制信号与PWM信号，通过输出端OUT输出一个控制信号，来控制主开关断开或者闭合，在主开关闭合时为电池管理系统电路的负载电容C4进行预充电。
需要说明的是，控制器1还连接于主负开关S2与防反开关S3，在对负载电容C4进行预充电之前，控制器1会输出持续的高电平信号至主负开关S2与防反开关S3，以使主负开关S2与防反开关S3闭合。
由于第一实施例与本实施例相互对应，因此本实施例可与第一实施例互相配合实施。第一实施例中提到的相关技术细节在本实施例中依然有效，在第一实施例中所能达到的技术效果在本实施例中也同样可以实现，为了减少重复，这里不再赘述。相应地，本实施例中提到的相关技术细节也可应用在第一实施例中。
本实施例相对于现有技术而言，PWM控制单元能够检测电池管理系统电路的主开关闭合时电池管理系统电路中的电流，并根据该电流输出控制信号至驱动单元，控制器输出预 设的PWM信号至驱动单元，驱动单元根据接收到的控制信号与PWM信号控制主开关断开或者闭合，在主开关闭合时能够为电池管理系统电路的负载电容进行预充电。本申请中，PWM控制单元输出控制信号至驱动单元、控制器输出PWM信号至驱动单元，从而驱动单元可以根据控制信号与PWM信号来控制主开关的通断实现对负载电容的预充电，相对于现有的预充回路减少了成本消耗；同时，通过对控制器输出的PWM信号的调整来调节负载电容的预充时间，能够根据需要调节电池管理电路的负载电容的预充时间，以实现快速预充。
本申请的第六实施例涉及一种预充方法，本实施例与第五实施例大致相同，主要不同之处在于：提供了第五实施例中的步骤101与步骤103的具体方式。
本实施例的预充方法具体流程如图9所示。
步骤201，在电流大于预设的电流阈值时，通过PWM控制单元输出低电平的控制信号至驱动单元，并在电流小于或等于电流阈值时，停止输出低电平的控制信号至驱动单元。
步骤202，通过控制器输出预设的PWM信号至驱动单元。
步骤203，在接收到低电平的控制信号与PWM信号时，通过驱动单元控制主开关断开，并在未接收到低电平的控制信号且PWM信号为高电平时，通过驱动单元控制主开关闭合，以为电池管理系统电路的负载电容进行预充电。
具体而言，在零状态响应情况下，电池管理系统电路中的主开关闭合时，电池管理系统电路中会产生一个很大的瞬时电流，电池管理系统电路具有安全电流值(即预设的电流阈值)。
PWM控制单元2在检测主开关闭合时电池管理系统电路中的电流大于预设的电流阈值时，PWM控制单元2会输出低电平的控制信号至驱动单元3，控制器1输出PWM信号至驱动单元3，此时控制器1输出到驱动单元3的PWM信号被低电平的控制信号拉低，耦合到驱动单元3的输入端的信号为0，驱动单元3控制主开关断开，电池管理系统电路的负载电容C4未进行预充电。
PWM控制单元2在检测主开关闭合时电池管理系统电路中的电流小于或等于预设的电流阈值时，PWM控制单元2停止输出低电平的控制信号至驱动单元3，控制器1输出PWM信号至驱动单元3，此时驱动单元3的输入仅由控制器1输出的PWM信号来决定，当PWM信号处于高电平时，驱动单元3控制主开关闭合，为电池管理系统电路的负载电容C4进行预充电，在PWM信号处于低电平时，驱动单元3控制主开关断开，停止为负载电容C4预充电。当PWM信号的下一个高电平到来时，重复上述的过程。
由于第二实施例与本实施例相互对应，因此本实施例可与第二实施例互相配合实施。 第二实施例中提到的相关技术细节在本实施例中依然有效，在第二实施例中所能达到的技术效果在本实施例中也同样可以实现，为了减少重复，这里不再赘述。相应地，本实施例中提到的相关技术细节也可应用在第二实施例中。
本实施例相对于第五实施例而言，在主开关闭合时电池管理系统电路中的电流大于预设的电流阈值时，PWM控制单元输出低电平的控制信号至驱动单元，控制器输出PWM信号至驱动单元，此时耦合到驱动单元的信号为0，驱动单元控制主开关断开；在电流小于或等于电流阈值时，PWM控制单元停止输出低电平的控制信号至驱动单元，控制器输出PWM信号至驱动单元，此时由PWM信号来控制主开关的通断，在PWM信号处于高电平时，驱动单元控制主开关闭合来实现对负载电容的预充，从而在保护电池管理系统电路的同时实现对负载电容的预充。
本申请的第七实施例涉及一种预充方法，本实施例与第五实施例大致相同，主要不同之处在于：提供了通过PWM控制单元检测主开关闭合时电池管理系统电路中的电流，并根据电流输出控制信号至驱动单元的一种具体实现方式。
本实施例的预充方法应用于第三实施例中的预充电路，预充电路的示意图如图3所示，电池管理系统电路如图4所示。
本实施例的预充方法具体流程如图10所示。
步骤301包括以下子步骤：
子步骤3011，通过采样单元检测主开关闭合时电池管理系统电路中的电流。
子步骤3012，在电流大于预设的电流阈值时，控制PWM输出单元通过半导体开关输出低电平的控制信号至驱动单元，并在电流小于或等于预设的电流阈值时，控制PWM输出单元通过半导体开关停止输出低电平的控制信号至驱动单元。
步骤302，通过控制器输出预设的PWM信号至驱动单元。
步骤303，在接收到低电平的控制信号与PWM信号时，通过驱动单元控制主开关断开，并在未接收到低电平的控制信号且PWM信号为高电平时，通过驱动单元控制主开关闭合，以为电池管理系统电路的负载电容进行预充电。
具体而言，请参考图5与图6，在预充过程中，控制器1时钟输出预设的PWM信号至驱动单元，控制器1与驱动单元3之间一般还串联有限流电阻R1；采样单元21检测主开关闭合时电池管理系统电路中的电流，在主开关闭合时电池管理系统电路中的电流大于预设的电流阈值时，PWM输出单元22输出高电平的电信号至半导体开关S4，半导体开关S4导通，从而输出一个低电平的控制信号至驱动单元3，此时控制器1输出到驱动单元3的PWM 信号被低电平的控制信号拉低，耦合到驱动单元3的输入端的信号为0，驱动单元3控制主开关断开，电池管理系统电路的负载电容C4未进行预充电。在主开关闭合时电池管理系统电路中的电流小于或等于预设的电流阈值时，PWM输出单元22输出低电平的电信号至半导体开关S4，半导体开关S4截止，停止输出低电平的控制信号至驱动单元3，此时驱动单元3的输入仅由控制器1输出的PWM信号来决定，当PWM信号处于高电平时，驱动单元3控制主开关闭合，为电池管理系统电路的负载电容C4进行预充电，在PWM信号处于低电平时，驱动单元3控制主开关断开，停止为负载电容C4预充电。当PWM信号的下一个高电平到来时，重复上述的过程。
由于第三实施例与本实施例相互对应，因此本实施例可与第三实施例互相配合实施。第三实施例中提到的相关技术细节在本实施例中依然有效，在第三实施例中所能达到的技术效果在本实施例中也同样可以实现，为了减少重复，这里不再赘述。相应地，本实施例中提到的相关技术细节也可应用在第三实施例中。
本实施例相对于第六实施例而言，提供了通过PWM控制单元检测主开关闭合时电池管理系统电路中的电流，并根据电流输出控制信号至驱动单元的一种具体实现方式。
本申请的第八实施例涉及一种预充方法，本实施例是在第七实施例基础上的改进，主要改进之处在于：通过对负载电容两端的电压的检测来判断负载电容是否预充电完成。
本实施例的预充方法应用于第四实施例中的预充电路，预充电路的示意图如图6所示。
本实施例的预充方法具体流程如图11所示。
其中，步骤401至步骤403与步骤301至步骤303大致相同在此不再赘述，主要不同之处在于，增加了步骤404至步骤406，具体如下：
步骤404，通过高压采样单元检测负载电容两端的电压。
步骤405，在负载电容两端的电压达到预设的电压阈值时，通过PWM控制单元停止输出控制信号至驱动单元。
步骤406，在负载电容两端的电压达到预设的电压阈值时，停止通过控制器输出PWM信号，并通过控制器输出高电平的电信号至驱动单元。
具体而言，高压采样单元4能够检测负载电容C4两端的电压，在负载电容C4预充电的过程中，负载电容C4两端的电压会逐渐增大，主开关闭合时电池管理系统电路产生的瞬时电流会逐渐减小，负载电容C4两端的电压为主开关断开前瞬时的电压值；在负载电容C4预充过程中，负载电容C4两端电压变化
Figure PCTCN2019124957-appb-000003
电池管理系统电路的电流变 化
Figure PCTCN2019124957-appb-000004
其中τ＝R×C，U V1表示电池组V1电压，R为电池管理系统电路的等效阻抗，C为负载电容C4电容值，t表示预充时间。
在负载电容C4预充电的过程中，若负载电容C4两端的电压U C4达到预设的电压阈值，负载电容C4预充电完成，PWM控制单元2的PWM输出单元22通过半导体开关S4停止输出低电平的控制信号至驱动单元3，控制器1停止输出PWM信号，并输出高电平的电信号至驱动单元3，此时驱动单元3仅接收到控制器1输出高电平的电信号，主开关闭合，电池管理系统电路开始正常工作。其中，电压阈值例如为电池组V1电压U V1的95％，即当检测到负载电容C4两端的电压达到电池电压U V1的95％时，停止为负载电容C4预充电。
由于第四实施例与本实施例相互对应，因此本实施例可与第四实施例互相配合实施。第四实施例中提到的相关技术细节在本实施例中依然有效，在第四实施例中所能达到的技术效果在本实施例中也同样可以实现，为了减少重复，这里不再赘述。相应地，本实施例中提到的相关技术细节也可应用在第四实施例中。
本实施例相对于第七实施例而言，通过高压采样单元检测负载电容两端的电压，通过高压采样单元检测负载电容两端的电压，从而能够在负载电容两端的电压达到预设的电压阈值时，控制电池管理系统电路开始正常工作。
本领域的普通技术人员可以理解，上述各实施例是实现本申请的具体实施例，而在实际应用中，可以在形式上和细节上对其作各种改变，而不偏离本申请的精神和范围。

Claims (12)

  1. 一种预充电路，包括：控制器、PWM控制单元以及驱动单元；所述控制器与所述PWM控制单元分别连接于所述驱动单元，所述驱动单元连接于电池管理系统电路的主开关；
    所述PWM控制单元用于检测所述主开关闭合时所述电池管理系统电路中的电流；
    所述PWM控制单元还用于根据所述电流输出控制信号至所述驱动单元；
    所述控制器用于输出预设的PWM信号至所述驱动单元；
    所述驱动单元用于根据接收到的所述控制信号与所述PWM信号，控制所述主开关断开或者闭合，以在所述主开关闭合时为所述电池管理系统电路的负载电容进行预充电。
  2. 根据权利要求1所述的预充电路，其中，所述PWM控制单元具体用于在所述电流大于预设的电流阈值时，输出低电平的所述控制信号至所述驱动单元，并在所述电流小于或等于预设的电流阈值时，停止输出所述低电平的所述控制信号至所述驱动单元；
    所述驱动单元具体用于在接收到所述低电平的所述控制信号与PWM信号时，控制所述主开关断开，并在未接收到所述低电平的所述控制信号且所述PWM信号为高电平时，控制所述主开关闭合，以为所述电池管理系统电路的负载电容进行预充电。
  3. 根据权利要求1或2所述的预充电路，其中，所述PWM控制单元包括依次连接的采样单元、PWM输出单元以及半导体开关，所述半导体开关连接于所述驱动单元；
    所述采样单元用于检测所述主开关闭合时所述电池管理系统电路中的电流；
    所述PWM输出单元用于在所述电流大于预设的电流阈值时，通过所述半导体开关输出所述低电平的所述控制信号至所述驱动单元，并在所述电流小于或等于预设的电流阈值时，通过所述半导体开关停止输出所述低电平的所述控制信号至所述驱动单元。
  4. 根据权利要求1所述的预充电路，其中，所述预充电路还包括连接于所述PWM控制单元与所述控制器的高压采样单元；
    所述高压采样单元用于检测所述负载电容两端的电压；
    所述PWM控制单元还用于在所述负载电容两端的电压达到预设的电压阈值时，停止输出所述控制信号至所述驱动单元；
    所述控制器用于在所述负载电容两端的电压达到预设的电压阈值时，停止输出所述PWM信号，并输出高电平的电信号至所述驱动单元。
  5. 根据权利要求3所述的预充电路，其中，所述采样单元具体用于采集所述电池管理系统电路中的分流器两端的电压，并根据所述分流器的阻值与所述分流器两端的电压计算得到 所述电流。
  6. 根据权利要求3所述的预充电路，其中，所述PWM输出单元具体用于在所述电流大于预设的电流阈值时，输出高电平的电信号导通所述半导体开关，以输出所述低电平的所述控制信号至所述驱动单元；
    所述PWM输出单元具体用于在所述电流小于或等于预设的电流阈值时，输出低电平的电信号截止所述半导体开关，以停止输出所述低电平的所述控制信号至所述驱动单元。
  7. 根据权利要求1所述的预充电路，其中，所述主开关为半导体功率开关。
  8. 根据权利要求7所述的预充电路，其中，所述半导体功率开关为绝缘栅双极型晶体管IGBT或金属氧化物半导体场效应晶体管MOSFET。
  9. 一种预充方法，应用于预充电路，所述预充电路包括控制器、PWM控制单元以及驱动单元；所述控制器与所述PWM控制单元分别连接于所述驱动单元，所述驱动单元连接于电池管理系统电路的主开关；
    所述方法包括：
    通过所述PWM控制单元检测所述主开关闭合时所述电池管理系统电路中的电流，并通过所述PWM控制单元根据所述电流输出控制信号至所述驱动单元；
    通过所述控制器输出预设的PWM信号至所述驱动单元；
    通过所述驱动单元根据接收到的所述控制信号与所述PWM信号，控制所述主开关断开或者闭合，以在所述主开关闭合时为所述电池管理系统电路的负载电容进行预充电。
  10. 根据权利要求9所述的预充方法，其中，所述通过所述PWM控制单元根据所述电流输出控制信号至所述驱动单元，具体为：
    在所述电流大于预设的电流阈值时，通过所述PWM控制单元输出低电平的所述控制信号至所述驱动单元，并在所述电流小于或等于所述电流阈值时，停止输出所述低电平的所述控制信号至所述驱动单元；
    所述通过所述驱动单元根据接收到的所述控制信号与所述PWM信号，控制所述主开关断开或者闭合，以在所述主开关闭合时为所述电池管理系统电路的负载电容进行预充电，具体为：
    在接收到所述低电平的所述控制信号与PWM信号时，通过所述驱动单元控制所述主开关断开，并在未接收到所述低电平的所述控制信号且所述PWM信号为高电平时，通过所述驱动单元控制所述主开关闭合，以为所述电池管理系统电路的负载电容进行预充电。
  11. 根据权利要求9或10所述的预充方法，其中，所述PWM控制单元包括依次连接的 采样单元、PWM输出单元以及半导体开关，所述半导体开关连接于所述驱动单元；
    所述通过所述PWM控制单元检测所述主开关闭合时所述电池管理系统电路中的电流，并通过所述PWM控制单元根据所述电流输出控制信号至所述驱动单元，具体包括：
    通过所述采样单元检测所述主开关闭合时所述电池管理系统电路中的电流；
    在所述电流大于预设的电流阈值时，控制所述PWM输出单元通过所述半导体开关输出所述低电平的所述控制信号至所述驱动单元，并在所述电流小于或等于预设的电流阈值时，控制所述PWM输出单元通过所述半导体开关停止输出所述低电平的所述控制信号至所述驱动单元。
  12. 根据权利要求9所述的预充方法，其中，所述预充电路还包括连接于所述PWM控制单元与所述控制器的高压采样单元；
    所述方法还包括：
    通过所述高压采样单元检测所述负载电容两端的电压；
    在所述负载电容两端的电压达到预设的电压阈值时，通过所述PWM控制单元停止输出所述控制信号至所述驱动单元；
    在所述负载电容两端的电压达到预设的电压阈值时，停止通过所述控制器输出所述PWM信号，并通过所述控制器输出高电平的电信号至所述驱动单元。
PCT/CN2019/124957 2018-12-04 2019-12-12 预充电路与预充方法 Ceased WO2020114520A1 (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US17/123,022 US20210184486A1 (en) 2018-12-04 2020-12-15 Pre-charging circuit and pre-charging method

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201811474762.X 2018-12-04
CN201811474762.XA CN110962679B (zh) 2018-12-04 2018-12-04 预充电路与预充方法

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US17/123,022 Continuation US20210184486A1 (en) 2018-12-04 2020-12-15 Pre-charging circuit and pre-charging method

Publications (1)

Publication Number Publication Date
WO2020114520A1 true WO2020114520A1 (zh) 2020-06-11

Family

ID=70029562

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2019/124957 Ceased WO2020114520A1 (zh) 2018-12-04 2019-12-12 预充电路与预充方法

Country Status (3)

Country Link
US (1) US20210184486A1 (zh)
CN (1) CN110962679B (zh)
WO (1) WO2020114520A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114590141A (zh) * 2022-03-30 2022-06-07 潍柴动力股份有限公司 一种车载电池预充系统及方法

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114726012B (zh) * 2021-01-04 2024-07-19 光宝电子(广州)有限公司 电池模块及电源供应器
CN114006426A (zh) * 2021-09-30 2022-02-01 浙江高泰昊能科技有限公司 一种大容性负载预充电路及其工作方法
CN115189439A (zh) * 2022-07-06 2022-10-14 石家庄通合电子科技股份有限公司 功率分配单元的预充时间调整方法、终端及存储介质
WO2024119932A1 (zh) * 2022-12-09 2024-06-13 欣旺达动力科技股份有限公司 预充电路及其控制方法、电池管理系统、电动汽车
CN116279193B (zh) * 2023-03-17 2025-12-19 常州易控汽车电子股份有限公司 一种车辆控制器的开关控制电路
WO2025072949A1 (en) * 2023-09-28 2025-04-03 Microchip Technology Incorporated Method and apparatus for pre-charging dc-link capacitor in high voltage dc distribution system
CN120855607B (zh) * 2025-09-19 2025-12-23 长安大学 一种基于负载端容值控制充电时间的方法及系统

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1889325A (zh) * 2006-07-21 2007-01-03 上海广为拓浦电源有限公司 智能化高频蓄电池充电器
US20130076312A1 (en) * 2011-09-23 2013-03-28 Askey Computer Corp. Charging current control method and charging system
CN106533307A (zh) * 2016-12-28 2017-03-22 南京理工大学 基于dsp的电动汽车用永磁同步电机矢量解耦控制器
CN107230809A (zh) * 2016-03-24 2017-10-03 宁德时代新能源科技股份有限公司 电池包充电保护方法、对应的电池包和电池包充电设备
CN108173334A (zh) * 2018-03-22 2018-06-15 固安华电天仁控制设备有限公司 一种超级电容充电保护装置及方法
CN207603599U (zh) * 2017-12-15 2018-07-10 科博达技术股份有限公司 具有保护功能的车载高边开关

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09322425A (ja) * 1996-05-31 1997-12-12 Sanyo Electric Co Ltd 充電装置
JP3168191B2 (ja) * 1999-02-12 2001-05-21 トヨタ自動車株式会社 充電装置
JP2004364488A (ja) * 2003-05-12 2004-12-24 Taiyo Yuden Co Ltd スイッチング電源回路およびその過電流保護方法
US7804436B2 (en) * 2006-07-26 2010-09-28 Siflare, Inc Current mode analog-to-digital converter
CN102801198B (zh) * 2012-08-31 2015-02-25 无锡富洪科技有限公司 储能装置
US9925878B2 (en) * 2013-09-26 2018-03-27 Ford Global Technologies, Llc Bus pre-charge control using a buck converter
US10004911B2 (en) * 2014-01-16 2018-06-26 Boston Scientific Neuromodulation Corporation Circuitry for charging a depleted battery in an implantable medical device without passive trickle charging
CN103904736B (zh) * 2014-03-14 2016-01-13 南车南京浦镇车辆有限公司 电压均衡型超级电容储能装置
CN204597511U (zh) * 2015-03-02 2015-08-26 沃太能源南通有限公司 一种新型电池预充电电路
CN104986047B (zh) * 2015-05-28 2017-12-05 安徽江淮汽车集团股份有限公司 一种低压混合动力汽车电池系统控制方法
CN107253439B (zh) * 2017-06-29 2019-09-24 科力远混合动力技术有限公司 混合动力汽车高压系统的预充电控制电路及控制方法
CN107650729B (zh) * 2017-10-26 2019-06-04 科博达技术股份有限公司 新能源汽车的高压电器的预充电装置
KR102045404B1 (ko) * 2017-12-05 2019-11-15 한국단자공업 주식회사 스마트 ｐｒａ 프리차징 시스템
US10319425B1 (en) * 2018-03-29 2019-06-11 QUALCOMM Technologies Incorporated Offset-cancellation sensing circuit (OCSC)-based non-volatile (NV) memory circuits

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1889325A (zh) * 2006-07-21 2007-01-03 上海广为拓浦电源有限公司 智能化高频蓄电池充电器
US20130076312A1 (en) * 2011-09-23 2013-03-28 Askey Computer Corp. Charging current control method and charging system
CN107230809A (zh) * 2016-03-24 2017-10-03 宁德时代新能源科技股份有限公司 电池包充电保护方法、对应的电池包和电池包充电设备
CN106533307A (zh) * 2016-12-28 2017-03-22 南京理工大学 基于dsp的电动汽车用永磁同步电机矢量解耦控制器
CN207603599U (zh) * 2017-12-15 2018-07-10 科博达技术股份有限公司 具有保护功能的车载高边开关
CN108173334A (zh) * 2018-03-22 2018-06-15 固安华电天仁控制设备有限公司 一种超级电容充电保护装置及方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114590141A (zh) * 2022-03-30 2022-06-07 潍柴动力股份有限公司 一种车载电池预充系统及方法
CN114590141B (zh) * 2022-03-30 2023-12-15 潍柴动力股份有限公司 一种车载电池预充系统及方法

Also Published As

Publication number Publication date
CN110962679A (zh) 2020-04-07
US20210184486A1 (en) 2021-06-17
CN110962679B (zh) 2020-11-06

Similar Documents

Publication Publication Date Title
WO2020114520A1 (zh) 预充电路与预充方法
EP3021486A1 (en) System and method for driving a power switch
CN107809171B (zh) 开关电源及其功率开关管的驱动方法与驱动电路
WO2016011893A1 (zh) 逆变器电路的过流保护系统和方法
CN110021992A (zh) 一种主备电源切换电路及方法
CN106571794A (zh) 一种功率开关器件的闭环控制电路及方法
CN111742490A (zh) 自适应电压钳位器及相关方法
CN108286476A (zh) 用于共轨流量控制的双向电磁力控制阀的控制方法和装置
EP4089897A1 (en) System and method for controlling totem pole power factor correction circuit, and power adapter
WO2019196013A1 (en) Boost converter short circuit protection
CN112769103B (zh) 一种用于超级电容器的暂态支撑保护系统
US20260039287A1 (en) Charge pump gate driver circuit with an adjustable pump voltage for active dv/dt control
TWI742403B (zh) 具有整合式匯流排升壓電路之電流脈衝產生器
CN112104216A (zh) 预充电路
CN108599100B (zh) 一种开关控制电路及负载开关
CN120956253A (zh) 安全开关的驱动电路、低压电池供电系统、车辆动力系统
CN206865354U (zh) 一种抑制上电冲击的Boost电路
US11581885B2 (en) Pre-charge control circuit and method of controlling the same
US11588392B2 (en) Zero current detector with a gate pre-charge circuit
CN107645235A (zh) 一种限流保护电路、保护方法及开关电源电路
CN109586556B (zh) 一种多相脉宽降压调节电路及其调节方法
CN113381386A (zh) 包括恒定功率控制器的电气开关系统及相关方法
CN109962607B (zh) 一种限流控制调节方法和装置
US12328949B2 (en) Large capacitor pre-charge method and circuit
CN210405081U (zh) 一种基于boost升压电路的软启动装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 19891965

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2019891965

Country of ref document: EP

Effective date: 20210310

122 Ep: pct application non-entry in european phase

Ref document number: 19891965

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE