CN112271915A - Pre-charging and discharging method of electric drive controller and electric vehicle - Google Patents

Pre-charging and discharging method of electric drive controller and electric vehicle Download PDF

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Publication number
CN112271915A
CN112271915A CN202011078504.7A CN202011078504A CN112271915A CN 112271915 A CN112271915 A CN 112271915A CN 202011078504 A CN202011078504 A CN 202011078504A CN 112271915 A CN112271915 A CN 112271915A
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charging
switch
bus capacitor
voltage
bridge
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CN202011078504.7A
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CN112271915B (en
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刘小平
裴磊
徐位胜
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Guangdong Gaobiao Intelligent Technology Co ltd
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Shenzhen Gobao Electronic Technology Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/36—Means for starting or stopping converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5375—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with special starting equipment
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H02M1/322—Means for rapidly discharging a capacitor of the converter for protecting electrical components or for preventing electrical shock
    • 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
    • Y02T10/72—Electric energy management in electromobility

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

The invention discloses a pre-charging and discharging method of an electric drive controller and an electric vehicle. The pre-charging and discharging method includes: providing an electrical drive controller circuit; after power is on, a pre-charging switch is conducted to pre-charge the bus capacitor; closing an upper arm switch of a first bridge arm of the three-phase inverter bridge to obtain the voltage of a bus capacitor; when the voltage of the bus capacitor is consistent with the voltage of the battery within the first set time, the through switch is closed, and after the second set time, the pre-charging switch and the upper arm switch of the first bridge arm are disconnected to finish pre-charging; otherwise, indicating that the pre-charging is failed, disconnecting the pre-charging switch, closing lower arm switches of a second bridge arm and a third bridge arm of the three-phase inverter bridge, and discharging the bus capacitor through the motor. The invention omits a voltage acquisition chip of a bus capacitor and a special discharge circuit, and has the advantages of simplifying the circuit, saving devices and reducing the design cost of the system while ensuring the performance.

Description

Pre-charging and discharging method of electric drive controller and electric vehicle
Technical Field
The embodiment of the invention relates to the electric vehicle control technology, in particular to a pre-charging and discharging method of an electric drive controller and an electric vehicle.
Background
The battery voltage grade of common two-wheeled or three-wheeled electric vehicles such as electric motorcycles and mopeds is 36V/48V/60V/72V/96V, and at present, domestic electric drive controllers are all non-isolated, namely a control loop and a main power loop share GND, and the control loop is unsafe for users. Foreign countries have higher requirements for electric drive controllers with battery voltages above 48V, requiring isolation of the control loop from the main power loop. And when the electric drive controller is in a non-working state, the main loop of the electric drive controller cannot be electrified, so that the electric drive controller is required to cut off the electrical connection with the battery and quickly remove residual charges in the electric drive controller, and therefore, the electric drive controller is required to have a pre-charging function and a self-discharging function.
In the prior art, pre-charging is usually realized through a resistor, and measuring points are arranged between a battery anode and a capacitor anode and between a battery cathode and a capacitor cathode to obtain voltages at two ends of a capacitor; the conventional discharging circuit is to add a high-power resistor and a switch on the dc bus, and to turn on the discharging circuit to discharge the capacitor after the battery is removed. This is a relatively complex and costly circuit.
Disclosure of Invention
The invention provides a pre-charging and discharging method of an electric drive controller and an electric vehicle, which can enable the voltage of a bus capacitor to be measured more conveniently by changing the on-off of a circuit, do not need to be provided with a corresponding isolation chip, discharge through a motor after power-off or failure, and do not need to be provided with a special discharging loop.
In a first aspect, an embodiment of the present invention provides a method for precharging and discharging an electric drive controller, including:
providing an electric drive controller circuit comprising: the soft start module, the bus capacitor and the inverter; the bus capacitor is connected with the inverter in parallel, and the soft start module is connected between the negative electrode of the battery and the negative electrode of the bus capacitor in series; the soft start module comprises a pre-charging branch circuit and a through switch which are connected in parallel, and the pre-charging branch circuit comprises a pre-charging switch; the inverter comprises a three-phase inverter bridge which is respectively connected with leading-out ends of three-phase windings of the motor;
after the power is on, the pre-charging switch is conducted to start pre-charging the bus capacitor;
closing an upper arm switch of a first bridge arm of the three-phase inverter bridge to obtain the voltage of a bus capacitor;
when the voltage of the bus capacitor is consistent with the voltage of the battery within a first set time, closing the direct-current switch, and disconnecting the pre-charging switch and the upper arm switch of the first bridge arm after a second set time to finish pre-charging;
and otherwise, the pre-charging switch is switched off, the lower arm switches of the second bridge arm and the third bridge arm of the three-phase inverter bridge are switched on, and the bus capacitor is discharged through the motor.
The method for closing an upper arm switch of a first bridge arm of the three-phase inverter bridge to obtain the voltage of a bus capacitor comprises the following steps:
and taking a positive electrode measuring point between an upper arm switch of the first bridge arm and a winding of the motor, taking a negative electrode measuring point between the bus capacitor and the soft start module, and measuring phase voltage of the motor, wherein the phase voltage is equal to the voltage at two ends of the bus capacitor.
When the voltage of the bus capacitor is consistent with the voltage of the battery within a first set time, the direct-current switch is closed, and after a second set time, the pre-charging switch and the upper arm switch of the first bridge arm are disconnected to complete pre-charging, and the method comprises the following steps:
judging whether the difference value between the voltage of the bus capacitor and the voltage of the battery is within a first preset range within a first set time, if so, closing the through switch;
and judging whether the voltage of the bus capacitor is consistent with the voltage of the battery, if so, disconnecting the pre-charging switch and the upper arm switch of the first bridge arm after a second set time, and completing pre-charging.
Further, it is determined whether the difference between the voltage of the bus capacitor and the voltage of the battery within a first preset time is within a first preset range, and the method further includes:
if not, the pre-charging fails;
and disconnecting the pre-charging switch, closing the lower arm switches of the second bridge arm and the third bridge arm of the three-phase inverter bridge, and discharging the bus capacitor through the motor.
Further, judging whether the voltage of the bus capacitor is consistent with the voltage of the battery, the method further comprises:
if not, prompting that the circuit is abnormal;
and disconnecting the pre-charging switch and the through switch, closing the lower arm switches of the second bridge arm and the third bridge arm of the three-phase inverter bridge, and discharging the bus capacitor through the motor.
Further, after the bus capacitor is discharged by the motor, the method further includes:
and if the bus capacitor voltage drops below a second preset threshold, disconnecting the upper arm switch of the first bridge arm, the lower arm switches of the second bridge arm and the third bridge arm, and entering a standby state.
Further, after the power-on, before turning on the pre-charge switch and starting pre-charging the bus capacitor, the method further includes:
and acquiring and judging whether the battery voltage is within a third preset range, if so, turning on the pre-charging switch to start pre-charging the bus capacitor, and if not, prompting that the battery is abnormally connected.
Wherein, switch on the preliminary charging switch begins to the bus capacitance preliminary charging, include:
the pre-charging branch of the soft start module comprises a pre-charging resistor connected with a pre-charging switch in series, and after the pre-charging switch is switched on, the pre-charging resistor and the bus capacitor form an RC circuit.
The through switch comprises two N-channel MOS tubes, wherein the source electrodes of the two N-channel MOS tubes are connected in series.
In a second aspect, embodiments of the present invention further provide an electric vehicle including an electric drive controller, which can perform the method for pre-charging and discharging the electric drive controller as described above.
The invention realizes the pre-charging by connecting the soft start module to the negative electrode of the battery, and measures the voltage at the winding end of the motor and the negative electrode of the capacitor, namely, the voltage of the phase voltage equivalent bus capacitor of the motor is detected for judging the pre-charging state, and compared with the prior art, the invention omits a voltage acquisition chip of the bus capacitor; and the switch of the three-phase inverter bridge is controlled to be closed, so that the motor is connected into the circuit to discharge the bus capacitor, a special discharge circuit can be omitted, and the three-phase inverter bridge has the advantages of simplifying the circuit, saving devices and reducing the design cost of the system while ensuring the performance.
Drawings
FIG. 1 is a schematic diagram of an electrical drive controller circuit according to one embodiment of the present invention;
FIG. 2 is a flow chart of a method for pre-charging and discharging an electrically driven controller according to an embodiment of the present invention;
fig. 3 is a flow chart of a method for precharging and discharging an improved electric drive controller according to a second embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
The embodiment provides a pre-charging and discharging method of an electric drive controller, which is suitable for two-wheel or three-wheel electric vehicles with the battery voltage of more than 48V, can realize the isolation of a control loop and a main power loop, has the pre-charging function and the self-discharging function, relatively simplifies the circuit, optimizes the pre-charging control logic, and has lower hardware cost.
As shown in fig. 1, an electric vehicle provides an electric drive controller circuit comprising: the soft start module M1, the bus capacitor C1 and the inverter M2; the bus capacitor C1 is connected with the inverter M2 in parallel, and the soft start module M1 is connected between the negative pole of the battery B1 and the negative pole of the bus capacitor C1 in series; the soft start module M1 comprises a pre-charge branch and a pass-through switch connected in parallel, the pre-charge branch comprising a pre-charge switch Q1; the through switch comprises two N-channel MOS transistors Q2 and Q3 with the sources connected in series, and only Q2 can be adopted. The inverter M2 comprises a three-phase inverter bridge, three bridge arms are respectively connected with leading-out ends of three-phase windings of the motor, the first bridge arm comprises an upper arm switch MOS4 and a lower arm switch MOS5, the second bridge arm comprises an upper arm switch MOS6 and a lower arm switch MOS7, and the third bridge arm comprises an upper arm switch MOS8 and a lower arm switch MOS 9.
As shown in fig. 2, the method for precharging and discharging the electric drive controller includes the following steps:
and S11, after the power is on, the pre-charging switch is turned on to start pre-charging the bus capacitor.
The closing switch CB1 is powered on, the pre-charging branch of the soft start module M1 comprises a pre-charging resistor R1 connected with a pre-charging switch Q1 in series, and after the pre-charging switch Q1 is turned on, the pre-charging resistor R1 and the bus capacitor C1 form an RC circuit to start pre-charging the bus capacitor C1.
And S12, closing an upper arm switch of a first bridge arm of the three-phase inverter bridge to obtain the voltage of the bus capacitor.
And a positive electrode measurement point UA + is arranged between the upper arm switch MOS4 of the first bridge arm and a winding of the motor, a negative electrode measurement point BUS-is arranged between the BUS capacitor C1 and the soft start module M1, and phase voltage of the motor is measured and is equal to voltage at two ends of the BUS capacitor C1.
S13, judging whether the voltage of the bus capacitor is consistent with the battery voltage within the first set time, if yes, executing step S14, otherwise, executing step S15.
When the two voltages are consistent, the precharge is completed.
And S14, closing the direct switch, and after a second set time, disconnecting the pre-charging switch and the upper arm switch of the first bridge arm to finish pre-charging.
Normally, the bus capacitor C1 can complete the pre-charging within the first setting time, and when the voltage of the bus capacitor C1 is consistent with the voltage of the battery B1, the through switch is closed, and after the second setting time, the pre-charging switch Q1 and the upper arm switch MOS4 of the first arm are opened.
The first set time is calculated according to parameters of components of the circuit, including but not limited to resistance of the pre-charging set, pre-charging current, capacity of the bus capacitor, and the like. The second setting time can be set according to specific conditions, and only a certain time delay effect is needed, and 20mS is taken in the embodiment.
And S15, disconnecting the pre-charging switch, closing the lower arm switches of the second bridge arm and the third bridge arm of the three-phase inverter bridge, and discharging the bus capacitor through the motor.
If the precharging process is abnormal, the bus capacitor C1 does not reach the expected voltage within the first set time, and the feedback precharging fails; when the pre-charging switch Q1 needs to be opened, the lower arm switches MOS7 and MOS9 of the second arm and the third arm of the inverter M2 are closed, and the bus capacitor C1 is discharged through the motor.
Example two
The present embodiment is improved on the basis of the above embodiments, and the logic of pre-charging and discharging is optimized.
As shown in fig. 3, the method for precharging and discharging the electric drive controller includes the following steps:
and S21, after power-on, acquiring and judging whether the battery voltage is within a third preset range, if so, executing the step S22, and if not, prompting that the battery access is abnormal.
The third preset range refers to a numerical range when the battery voltage is normal, and if the battery voltage is not within the third preset range, it may be that the battery wiring is abnormal or the electric quantity is too low, and a user needs to be prompted to perform an inspection.
And S22, turning on the pre-charging switch to start pre-charging the bus capacitor.
And S23, closing an upper arm switch of a first bridge arm of the three-phase inverter bridge to obtain the voltage of the bus capacitor.
And a positive electrode measurement point UA + is arranged between the upper arm switch MOS4 of the first bridge arm and a winding of the motor, a negative electrode measurement point BUS-is arranged between the BUS capacitor C1 and the soft start module M1, and phase voltage of the motor is measured and is equal to voltage at two ends of the BUS capacitor C1.
In other embodiments, the upper arm switch of any one of the legs of the three-phase inverter bridge is closed, and a positive measurement point can be taken between the upper arm switch and the winding connected with the upper arm switch.
S24, determining whether the difference between the voltage of the bus capacitor and the battery voltage within the first setting time is within the first preset range, if yes, executing step S25, if no, executing step S27 if the precharging fails.
After the bus capacitor C1 is precharged for a first set time, the voltage will rise to be close to the battery voltage, and the first preset range is used to determine whether the bus capacitor C1 is precharged successfully, and may be a value according to a circuit design, generally the voltage division size of the precharge resistor R1.
And S25, closing the through switch, judging whether the voltage of the bus capacitor is consistent with the voltage of the battery, if so, executing a step S26, otherwise, prompting the circuit to be abnormal, and executing a step S27.
When the voltage of the bus capacitor C1 is close to the voltage of the battery, the through switches Q2 and Q3 can be closed to short-circuit the pre-charging branch, the current limitation of the pre-charging resistor R1 is eliminated, the pre-charging is continuously completed, the voltage of the bus capacitor C1 is enabled to be consistent with the voltage of the battery, and when the voltage of the bus capacitor C1 is consistent with the voltage of the battery, the pre-charging is completed.
And S26, disconnecting the pre-charging switch and the upper arm switch of the first bridge arm after a second set time, and completing pre-charging.
And disconnecting the pre-charging switch Q1 and the upper arm switch MOS4 of the first bridge arm to finish pre-charging.
And S27, disconnecting the pre-charging switch, closing the lower arm switches of the second bridge arm and the third bridge arm of the three-phase inverter bridge, and discharging the bus capacitor through the motor.
The upper arm switch of any one bridge arm in the three-phase inverter bridge is closed, and then the lower arm switches of the other two bridge arms are closed, so that the motor can be conducted to discharge.
And S28, if the bus capacitor voltage drops below a second preset threshold, disconnecting the upper arm switch of the first bridge arm, the lower arm switches of the second bridge arm and the third bridge arm, and entering a standby state.
In this embodiment, the second preset threshold is 3V, that is, when the voltage of the bus capacitor drops to a safe value, the motor can be turned off and enters a standby state.
In the embodiment, the soft start module is connected to the negative electrode of the battery to realize pre-charging, and voltage measurement is carried out on the winding end of the motor and the negative electrode of the capacitor, namely the voltage of the phase voltage equivalent bus capacitor of the motor is detected to judge the pre-charging state, so that a voltage acquisition chip of the bus capacitor is omitted compared with the prior art; and the switch of the three-phase inverter bridge is controlled to be closed, so that the motor is connected into the circuit to discharge the bus capacitor, a special discharge circuit can be omitted, and the three-phase inverter bridge has the advantages of simplifying the circuit, saving devices and reducing the design cost of the system while ensuring the performance.
EXAMPLE III
The present embodiment provides an electric vehicle including the electric drive controller of the above embodiment, which can perform the pre-charging and discharging method of the electric drive controller as described in the above embodiment.
The electric vehicle can execute the method provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (10)

1. A method of pre-charging and discharging an electrically driven controller, comprising:
providing an electric drive controller circuit comprising: the soft start module, the bus capacitor and the inverter; the bus capacitor is connected with the inverter in parallel, and the soft start module is connected between the negative electrode of the battery and the negative electrode of the bus capacitor in series; the soft start module comprises a pre-charging branch circuit and a through switch which are connected in parallel, and the pre-charging branch circuit comprises a pre-charging switch; the inverter comprises a three-phase inverter bridge which is respectively connected with leading-out ends of three-phase windings of the motor;
after the power is on, the pre-charging switch is conducted to start pre-charging the bus capacitor;
closing an upper arm switch of a first bridge arm of the three-phase inverter bridge to obtain the voltage of a bus capacitor;
when the voltage of the bus capacitor is consistent with the voltage of the battery within a first set time, closing the direct-current switch, and disconnecting the pre-charging switch and the upper arm switch of the first bridge arm after a second set time to finish pre-charging;
and otherwise, the pre-charging switch is switched off, the lower arm switches of the second bridge arm and the third bridge arm of the three-phase inverter bridge are switched on, and the bus capacitor is discharged through the motor.
2. The pre-charging and discharging method according to claim 1, wherein closing an upper arm switch of a first leg of the three-phase inverter bridge to obtain a voltage of a bus capacitor comprises:
and taking a positive electrode measuring point between an upper arm switch of the first bridge arm and a winding of the motor, taking a negative electrode measuring point between the bus capacitor and the soft start module, and measuring phase voltage of the motor, wherein the phase voltage is equal to the voltage at two ends of the bus capacitor.
3. The pre-charging and discharging method according to claim 1, wherein when the voltage of the bus capacitor is consistent with the battery voltage within a first set time, the through switch is closed, and after a second set time, the pre-charging switch and the upper arm switch of the first bridge arm are opened to complete the pre-charging, the method comprises:
judging whether the difference value between the voltage of the bus capacitor and the voltage of the battery is within a first preset range within a first set time, if so, closing the through switch;
and judging whether the voltage of the bus capacitor is consistent with the voltage of the battery, if so, disconnecting the pre-charging switch and the upper arm switch of the first bridge arm after a second set time, and completing pre-charging.
4. The pre-charging and discharging method as claimed in claim 3, wherein determining whether the difference between the voltage of the bus capacitor and the voltage of the battery within the first predetermined time is within a first predetermined range further comprises:
if not, the pre-charging fails;
and disconnecting the pre-charging switch, closing the lower arm switches of the second bridge arm and the third bridge arm of the three-phase inverter bridge, and discharging the bus capacitor through the motor.
5. The pre-charge and discharge method of claim 3, wherein determining whether the voltage of the bus capacitor is consistent with the battery voltage further comprises:
if not, prompting that the circuit is abnormal;
and disconnecting the pre-charging switch and the through switch, closing the lower arm switches of the second bridge arm and the third bridge arm of the three-phase inverter bridge, and discharging the bus capacitor through the motor.
6. The pre-charge and discharge method according to claim 1, 4 or 5, further comprising, after discharging the bus capacitor by the motor:
and if the bus capacitor voltage drops below a second preset threshold, disconnecting the upper arm switch of the first bridge arm, the lower arm switches of the second bridge arm and the third bridge arm, and entering a standby state.
7. The pre-charging and discharging method as claimed in claim 1, wherein after power-up, before turning on the pre-charging switch to start pre-charging the bus capacitor, the method further comprises:
and acquiring and judging whether the battery voltage is within a third preset range, if so, turning on the pre-charging switch to start pre-charging the bus capacitor, and if not, prompting that the battery is abnormally connected.
8. The pre-charge and discharge method of claim 1, wherein turning on the pre-charge switch to start pre-charging the bus capacitor comprises:
the pre-charging branch of the soft start module comprises a pre-charging resistor connected with a pre-charging switch in series, and after the pre-charging switch is switched on, the pre-charging resistor and the bus capacitor form an RC circuit.
9. The pre-charge and discharge method according to claim 1, wherein:
the through switch comprises two N-channel MOS tubes with sources connected in series.
10. An electric vehicle, characterized in that: comprising an electric drive controller that can perform the method of pre-charging and discharging of an electric drive controller as claimed in any one of claims 1 to 9.
CN202011078504.7A 2020-10-10 2020-10-10 Pre-charging and discharging method of electric drive controller and electric vehicle Active CN112271915B (en)

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