CN111049227A - Pre-charging circuit and charging method for motor controller - Google Patents
Pre-charging circuit and charging method for motor controller Download PDFInfo
- Publication number
- CN111049227A CN111049227A CN201911419231.5A CN201911419231A CN111049227A CN 111049227 A CN111049227 A CN 111049227A CN 201911419231 A CN201911419231 A CN 201911419231A CN 111049227 A CN111049227 A CN 111049227A
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- charging
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- energy storage
- motor controller
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000004146 energy storage Methods 0.000 claims abstract description 33
- 238000002955 isolation Methods 0.000 claims abstract description 27
- 239000003990 capacitor Substances 0.000 claims description 13
- 238000004891 communication Methods 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 230000000630 rising effect Effects 0.000 abstract description 3
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- 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
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a pre-charging circuit and a charging method of a motor controller, wherein the pre-charging circuit of the motor controller comprises an energy storage unit, and the energy storage unit is connected to a bus and used for storing electric energy; the input end of the isolation boosting unit is connected with the rechargeable battery, the output end of the isolation boosting unit is connected with the energy storage unit, and the isolation boosting unit boosts the voltage of the rechargeable battery to bus voltage for charging the energy storage unit; this controller precharge circuit carries out the preliminary charging for the energy storage unit with low-voltage electric energy conversion busbar voltage through keeping apart the unit that steps up, can not produce impulse current like this, and the voltage on the in-process busbar that precharges risees gradually, and until rising to the required magnitude of voltage of motor, battery charging unit reworks like this can avoid impulse current to cause the influence to components and parts, makes the design of whole car electrical framework more nimble.
Description
Technical Field
The invention relates to the field of motor control devices, in particular to a motor controller pre-charging circuit and a control method.
Background
The motor controller in the new energy automobile is generally a voltage-type inverter topology structure, and a bus in the structure is provided with a capacitor serving as an energy storage element. If the energy storage capacitor receives the high voltage of the bus instantly, impact current can be generated, and the energy storage capacitor is used for a long time, great harm is caused to components and motors, and the service life is influenced.
Disclosure of Invention
In order to solve the problem that the existing energy storage capacitor generates impact current during charging, the invention provides a motor controller pre-charging circuit and a charging method, which can realize pre-charging and do not generate impact current.
In order to achieve the above object, an aspect of the present invention provides a motor controller precharge circuit, including: the energy storage unit is connected to the bus and used for storing electric energy; the isolation boosting unit is used for boosting the voltage of the rechargeable battery to the bus voltage and charging the energy storage unit.
In the above technical solution, further, the energy storage unit is a capacitor.
On the basis of the technical scheme, one end of the bus is connected with the battery management unit, the other end of the bus is connected with the motor controller, and the motor controller is in communication connection with the battery management unit.
Furthermore, a charging resistor is connected between the isolation boosting unit and the energy storage unit.
As a preferred technical scheme, a diode is further arranged between the isolation boosting unit and the energy storage unit, the anode of the diode is connected with the isolation boosting unit, and the cathode of the diode is connected with the energy storage unit.
In another aspect, the present invention further provides a method for charging a motor using the motor controller pre-charge circuit, including the following steps: the motor controller acquires a pre-charging signal; starting the isolation boosting unit to charge the energy storage unit according to the pre-charging signal; continuing charging until the bus voltage reaches a threshold value; closing the isolation boosting unit and sending a signal to the battery management unit; the battery management unit closes the relay to supply power to the motor.
In the charging method, the threshold is a voltage value required by the motor during operation.
In the charging method, the battery management unit is in communication connection with the motor controller.
Compared with the prior art, the invention has the beneficial effects that: this controller is charging circuit in advance carries out the preliminary charging for the energy storage unit with low-voltage electric energy conversion busbar voltage through keeping apart the unit that steps up, can not produce impulse current like this, and the voltage on the in-process busbar that charges in advance risees gradually, and until rising to battery voltage, battery charging unit reworks like this, can avoid impulse current to cause the influence to components and parts, is applicable to the whole car electrical framework that does not have the preliminary charging circuit among the battery management system, makes the design of whole car electrical framework more nimble.
Drawings
FIG. 1 is a circuit diagram of a motor controller pre-charge circuit of the present invention;
FIG. 2 is a flow chart of a motor controller pre-charge method of the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
In one aspect, the present invention provides a motor controller pre-charge circuit, as shown in fig. 1, the pre-charge circuit includes a charge management unit, a motor controller, and a motor, the battery management unit is electrically connected to the motor controller through a bus, and the motor controller controls start and stop of the motor.
The motor controller comprises an energy storage unit, the energy storage unit is a capacitor C, and the capacitor C is connected to a bus and used for storing electric energy.
In addition, the isolation boosting unit is connected to two ends of the capacitor C, the input end of the isolation boosting unit is connected to the storage battery, the storage battery generally adopts a low-voltage storage battery, in the embodiment, 12V is adopted, and it should be noted that although 12V is adopted in the storage battery in the embodiment, other voltage levels are also within the protection scope of the invention, such as 5V, 24V and 36V. The isolation boosting unit is used for boosting the voltage of the storage battery to the bus to pre-charge the energy storage capacitor C.
The motor controller pre-charging circuit is generally applied to a new energy automobile, the isolation boosting unit can adopt an isolation type DC-DC boosting converter, the voltage of the storage battery is only required to be boosted to the bus voltage, the specific bus voltage depends on the voltage required by a motor in the new energy automobile, and for example, an HRA series of isolation boosting modules of Beifuke technologies, Inc., Shenzhen is provided.
Furthermore, a charging resistor R is connected between the isolation boosting unit and the energy storage capacitor, a diode D is further arranged between the isolation boosting unit and the energy storage capacitor C, the anode of the diode D is connected with the isolation boosting unit, the cathode of the diode is connected with the energy storage unit, the charging resistor R is used for charging the capacitor C, and the diode D plays a role in preventing backflow.
In addition, the motor controller and the battery management unit communicate through a CAN bus.
This controller pre-charge circuit carries out the pre-charge for the energy storage unit with low-voltage electric energy conversion busbar voltage through keeping apart the unit that steps up, can not produce impulse current like this, and the voltage on the pre-charge in-process generating line risees gradually, and until rising to the required voltage value of motor, battery charging unit reworks like this, can avoid impulse current to cause the influence to components and parts, is applicable to the whole car electrical framework that does not have the pre-charge circuit among the battery management system, makes the design of whole car electrical framework more nimble.
In another aspect, the present invention further provides a charging method for a motor using the motor controller pre-charge circuit described above, as shown in fig. 2, including the following steps:
s10: the battery management unit sends a pre-charging command to the motor controller through the CAN bus, and the motor controller obtains a pre-charging signal;
s20: the motor controller enables the isolation boosting unit to work, the isolation boosting unit converts low-voltage electric energy of the storage battery into high-voltage electric energy, and the energy storage unit starts to charge the energy, because the electric energy of the energy storage unit is slowly increased, and the motor does not work at the moment, the voltage on the bus can be gradually increased;
s30: in the charging process, whether the bus voltage reaches a threshold value is judged at intervals, and the threshold value is a voltage value required by the motor during working, namely the voltage released by the battery management unit;
s40: when the motor controller detects that the bus voltage reaches a threshold value, the isolation boosting unit is closed;
s50: in addition, the motor controller sends signals to the battery management unit through the CAN bus,
s60: and the battery management unit closes the relay after obtaining the signal to supply power for the motor.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and the scope of protection is still within the scope of the invention.
Claims (8)
1. A motor controller pre-charge circuit, comprising:
the energy storage unit is connected to the bus and used for storing electric energy;
the isolation boosting unit is used for boosting the voltage of the rechargeable battery to the bus voltage and charging the energy storage unit.
2. The motor controller pre-charge circuit of claim 1, wherein: the energy storage unit is a capacitor.
3. The motor controller pre-charge circuit of claim 1, wherein: one end of the bus is connected with a battery management unit, the other end of the bus is connected with a motor controller, and the motor controller is in communication connection with the battery management unit.
4. The motor controller pre-charge circuit of claim 1, wherein: and a charging resistor is connected between the isolation boosting unit and the energy storage unit.
5. The motor controller pre-charge circuit of claim 1, wherein: and a diode is further arranged between the isolation boosting unit and the energy storage unit, the anode of the diode is connected with the isolation boosting unit, and the cathode of the diode is connected with the energy storage unit.
6. A method of charging a pre-charged motor using a motor controller according to any of claims 1 to 5, wherein:
the motor controller acquires a pre-charging signal;
starting the isolation boosting unit to charge the energy storage unit according to the pre-charging signal;
continuing to charge until the bus voltage is at the threshold;
closing the isolation boosting unit and sending a signal to the battery management unit;
the battery management unit closes the relay to supply power to the motor.
7. The charging method according to claim 6, characterized in that: the threshold value is a voltage value required by the motor during working.
8. The charging method according to claim 6, characterized in that: and the battery management unit is in communication connection with the motor controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911419231.5A CN111049227A (en) | 2019-12-31 | 2019-12-31 | Pre-charging circuit and charging method for motor controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911419231.5A CN111049227A (en) | 2019-12-31 | 2019-12-31 | Pre-charging circuit and charging method for motor controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111049227A true CN111049227A (en) | 2020-04-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911419231.5A Pending CN111049227A (en) | 2019-12-31 | 2019-12-31 | Pre-charging circuit and charging method for motor controller |
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| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113285439A (en) * | 2021-07-22 | 2021-08-20 | 深之蓝(天津)水下智能科技有限公司 | Anti-ignition circuit, power supply device and robot |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203819054U (en) * | 2014-03-25 | 2014-09-10 | 潍柴动力股份有限公司 | Precharging circuit of motor controller |
| CN109823180A (en) * | 2017-11-22 | 2019-05-31 | 上海汽车集团股份有限公司 | A kind of precharging circuit of power battery |
-
2019
- 2019-12-31 CN CN201911419231.5A patent/CN111049227A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203819054U (en) * | 2014-03-25 | 2014-09-10 | 潍柴动力股份有限公司 | Precharging circuit of motor controller |
| CN109823180A (en) * | 2017-11-22 | 2019-05-31 | 上海汽车集团股份有限公司 | A kind of precharging circuit of power battery |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113285439A (en) * | 2021-07-22 | 2021-08-20 | 深之蓝(天津)水下智能科技有限公司 | Anti-ignition circuit, power supply device and robot |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200421 |
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| RJ01 | Rejection of invention patent application after publication |