CN112829587A - Motor controller active discharge system used in low-voltage electric fault - Google Patents
Motor controller active discharge system used in low-voltage electric fault Download PDFInfo
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- CN112829587A CN112829587A CN201911168869.6A CN201911168869A CN112829587A CN 112829587 A CN112829587 A CN 112829587A CN 201911168869 A CN201911168869 A CN 201911168869A CN 112829587 A CN112829587 A CN 112829587A
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- circuit
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/04—Cutting off the power supply under fault conditions
Abstract
A motor controller active discharge system for low voltage electrical faults, comprising: the high-voltage power supply, the capacitor, the standby power supply, the IGBT circuit and the motor are arranged on the bus, the driving circuit with the power supply is connected with the IGBT circuit, the low-voltage power supply with the power supply circuit is connected with the power supply of the driving circuit, the voltage sampling circuit, the CPLD circuit, the switch circuit and the driving circuit are sequentially connected with the capacitor, and the logic circuit is arranged between the CPLD circuit and the driving circuit. Compared with the traditional discharge way, the invention realizes the active discharge function by using the CPLD when the low-voltage power supply fails by expanding the application range of the standby power supply without adding a high-cost discharge unit, removes a high-power discharge resistor or other discharge circuits, effectively controls the cost of the whole machine, has simple heat dissipation design, reduces the volume of the whole machine and improves the power density.
Description
Technical Field
The invention relates to a technology in the field of motor drive control, in particular to an active discharge system of a motor controller for low-voltage electrical fault.
Background
In order to ensure personal safety, when the new energy automobile stops running, energy stored in a bus capacitor inside the power-down machine controller should be consumed to prevent electric shock accidents. The main methods of active discharge currently used are: the high-power discharge resistor is utilized, but the high-power discharge resistor is expensive and brings additional difficulty to heat dissipation and structural design; the motor winding is used for discharging, but when the low-voltage power supply fails, the main control chip cannot work normally and cannot perform active discharging operation. In the electrode controller, the capacity of a bus capacitor installed at a high-voltage direct-current input end is generally between hundreds of microfarads and several millifarads, and when the motor controller is shut down or fails, the motor controller is required to have the function of active discharge under any working condition. In order to realize the function of active discharge when the low-voltage power supply fails and simultaneously take cost requirements into consideration, a standby power supply is required to be utilized to control the motor winding to actively discharge.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides an active discharge system of a motor controller for low-voltage power failure, wherein a CPLD (programmable logic device) circuit realizes the control of a driving circuit through a switch circuit by expanding a standby power supply when the low-voltage power supply is abnormal; when the low-voltage power supply is normal, the main control module controls the motor to operate, and the switching circuit is disconnected at the moment, so that the isolation of high and low voltages is realized.
The invention is realized by the following technical scheme:
the invention relates to an active discharge system of a motor controller, which comprises: the high-voltage power supply, the capacitor, the standby power supply, the IGBT (insulated gate bipolar transistor) circuit and the motor which are arranged on the bus, the driving circuit with the power supply which is connected with the IGBT circuit, the low-voltage power supply with the power supply circuit which is connected with the power supply of the driving circuit, the voltage sampling circuit, the CPLD circuit, the switch circuit and the driving circuit which are sequentially connected with the capacitor, and the logic circuit which is arranged between the CPLD circuit and the driving circuit, wherein: when the low-voltage power supply is normal, the second primary side power switch is switched on, the first primary side power switch is switched off, the PWM switch circuit is switched off, the current flows to the motor through the driving circuit, the CPLD circuit transmits the sampling information transmitted by the sampling circuit to the logic circuit, and the logic circuit sends out six paths of PWM control signals to control the switching-on and switching-off of the IGBT circuit so that the motor normally runs or enters a zero-torque mode to release the electric energy of the bus capacitor; when the power supply of the low-voltage power supply is abnormal, the standby power supply obtains voltage from the capacitor, the CPLD circuit compares a sampling value transmitted by the sampling circuit with a threshold value, when the voltage of the bus is higher than the threshold value, the first primary side power switch is switched on, the second primary side power switch is switched off, the PWM switch circuit is switched on, the CPLD circuit sends out six PWM control signals, and the six PWM control signals are transmitted to the driving circuit through the PWM switch, so that the on-off of the IGBT circuit is controlled to enable the motor to normally run or enter a zero-torque mode to release the electric energy of the bus capacitor.
And an isolating circuit used for transmitting the voltage value of the bus is arranged between the CPLD circuit and the logic circuit.
The drive circuit comprises: former limit drive power supply, upper bridge secondary side drive power supply and lower bridge secondary side drive power supply to and correspond the upper bridge drive circuit and the lower bridge drive circuit of power supply with it respectively, wherein: the two ends of the upper bridge secondary side driving power supply and the two ends of the lower bridge secondary side driving power supply are respectively connected with the standby power supply and the power supply circuit, and the upper bridge driving circuit and the lower bridge driving circuit both receive signals of the switching circuit and the logic circuit and both transmit the signals to the IGBT circuit.
When the lower bridge driving power supply supplies power to the lower bridge driving circuit, high-voltage 5V and 3.3V power supplies are generated through an LDO (low dropout regulator).
Technical effects
Compared with the prior art, the invention realizes the active discharge function by using the CPLD when the low-voltage power supply fails by expanding the application range of the standby power supply without adding a high-cost discharge unit, removes a high-power discharge resistor or other discharge circuits, effectively controls the cost of the whole machine, has simple heat dissipation design, reduces the volume of the whole machine and improves the power density by comparing with the traditional discharge approach.
Drawings
FIG. 1 is a schematic structural view of the present invention;
in the figure: a is a circuit diagram; b is a signal transmission diagram;
FIG. 2 is a logic diagram of the present invention;
in the figure: the device comprises a high-voltage power supply 1, a motor 2, a bus capacitor 3, an IGBT circuit 4, a standby power supply 5, an upper bridge driving power supply 6, a lower bridge driving power supply 7, high-voltage 5V and 3.3V power supplies 8, a power supply circuit 9, a low-voltage power supply 10, a sampling circuit 11, an upper bridge driving circuit 12, a CPLD circuit 13, a switch circuit 14, a lower bridge driving circuit 15, an isolation circuit 16, a logic circuit 17, a driving circuit 18, a first primary side power supply switch 19 and a second primary side power supply switch 20.
Detailed Description
As shown in fig. 1, the present embodiment includes: the high-voltage power supply 1, the motor 2, the bus capacitor 3, the IGBT circuit 4, the standby power supply 5, the drive circuit 18, the low-voltage power supply 10, the sampling circuit 11, the CPLD circuit 13 and the switch circuit 14 and the isolation circuit 16 for high-low voltage isolation in the low-voltage region, wherein: the high-voltage power supply 1, the motor 2, the bus capacitor 3, the IGBT circuit 4 and the standby power supply 5 are arranged on a bus, the driving circuit 12 is connected with the standby power supply 5 and the low-voltage power supply 10 with the power supply circuit 9, the bus capacitor 3 is connected with the sampling circuit 11, the sampling circuit 11 transmits a bus voltage signal to the CPLD circuit 13, the isolation circuit 16 is used for transmitting state signals such as a bus voltage value, the switching circuit 14 is in an off state at ordinary times to ensure isolation and outputs six PWM control signals to the driving circuit 18 when the low-voltage power supply fails, and the driving circuit 18 controls the on and off of the IGBT circuit 4 according to the combination and the state of the PWM control signals.
The driving circuit 18 includes: go up bridge drive power supply 6, lower bridge drive power supply 7, go up bridge drive circuit 12 and lower bridge drive circuit 15, wherein: the two ends of the upper bridge driving power supply 6 and the lower bridge driving power supply 7 are respectively connected with the standby power supply 5 and the power supply circuit 9, the upper bridge driving circuit 12 and the lower bridge driving circuit 15 receive six paths of PWM control signals from the switching circuit 14 during normal work, and receive PWM control signals transmitted from the CPLD circuit 13 through the switching circuit 14 and transmit the PWM control signals to the IGBT circuit 4 when low-voltage power supply is abnormal.
When the lower bridge driving power supply 7 supplies power to the lower bridge driving circuit 15, high-voltage 5V and 3.3V power supplies 8 are generated through the LDO.
As shown in fig. 2, the above system operates by: the switching circuit 14 is disconnected, whether the low-voltage power supply 10 is normal is judged, when the low-voltage power supply 10 is normal and a discharge instruction is received, the second primary side power supply switch is switched on, the first primary side power supply switch is disconnected, the logic circuit 17 sends out a PWM control signal and transmits the PWM control signal to the driving circuit 18 through the isolation circuit 16, so that the on-off of the IGBT circuit 4 is controlled to enable the motor 2 to normally operate or enter a zero-torque mode, whether the bus voltage value acquired by the sampling circuit 11 is smaller than a safety threshold value or not is judged, the operation is finished if the bus voltage value is smaller than the safety threshold value, and; when the low-voltage power supply 10 is abnormal and the bus voltage value acquired by the sampling circuit 11 is greater than the discharge threshold value, the first primary side power switch is turned on, the second primary side power switch is turned off, the switching circuit 14 is turned off, and the CPLD circuit 13 sends a PWM control signal to the driving circuit 18, so that the on-off of the IGBT circuit 4 is controlled to enable the motor to normally operate or enter a zero-torque mode, whether the bus voltage acquired by the sampling circuit 11 is less than the safety threshold value is judged, if the bus voltage value is less than the safety threshold value, the operation is ended, and if the bus voltage value is greater than.
The device utilizes the CPLD device in the high-voltage area to control the driving circuit when the low-voltage power supply fails, thereby achieving the purpose of active discharge through the motor winding; the device can realize the function of active discharge under the condition of low-voltage power supply abnormity under the condition of increasing the cost as little as possible, and is favorable for realizing the function safety of the motor controller.
The foregoing embodiments may be modified in many different ways by those skilled in the art without departing from the spirit and scope of the invention, which is defined by the appended claims and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (4)
1. A motor controller active discharge system for low voltage electrical faults, comprising: the high-voltage power supply, the capacitor, the standby power supply, the IGBT circuit and the motor are arranged on the bus, the drive circuit with the power supply is connected with the IGBT circuit, the low-voltage power supply with the power supply circuit is connected with the power supply of the drive circuit, the voltage sampling circuit, the CPLD circuit, the switch circuit and the drive circuit are sequentially connected with the capacitor, and the logic circuit is arranged between the CPLD circuit and the drive circuit, wherein: when the low-voltage power supply is normal, the second primary side power switch is switched on, the first primary side power switch is switched off, the PWM switch circuit is switched off, the current flows to the motor through the driving circuit, the CPLD circuit transmits the sampling information transmitted by the sampling circuit to the logic circuit, and the logic circuit sends out six paths of PWM control signals to control the switching-on and switching-off of the IGBT circuit so that the motor normally operates or enters a zero-torque mode to release the electric energy of the bus capacitor; when the power supply of the low-voltage power supply is abnormal, the standby power supply obtains voltage from the capacitor, the CPLD circuit compares a sampling value transmitted by the sampling circuit with a threshold value, when the voltage of the bus is higher than the threshold value, the first primary side power switch is switched on, the second primary side power switch is switched off, the PWM switch circuit is switched on, the CPLD circuit sends out six PWM control signals, and the six PWM control signals are transmitted to the driving circuit through the PWM switch, so that the on-off of the IGBT circuit is controlled to enable the motor to normally run or enter a zero-torque mode to release the electric energy of the bus capacitor.
2. The active discharge system of motor controller for low voltage electric fault as claimed in claim 1, wherein an isolation circuit for transmitting bus voltage value is provided between the CPLD circuit and the logic circuit.
3. The active discharge system of motor controller for low voltage electrical fault of claim 1 wherein said drive circuit comprises: former limit drive power supply, upper bridge secondary side drive power supply and lower bridge secondary side drive power supply to and correspond the upper bridge drive circuit and the lower bridge drive circuit of power supply with it respectively, wherein: the two ends of the upper bridge secondary side driving power supply and the two ends of the lower bridge secondary side driving power supply are respectively connected with the standby power supply and the power supply circuit, and the upper bridge driving circuit and the lower bridge driving circuit both receive signals of the switching circuit and the logic circuit and both transmit the signals to the IGBT circuit.
4. The active discharging system of motor controller for low voltage power failure as claimed in claim 3, wherein the low bridge driving power supply generates 5V and 3.3V high voltage power supply through LDO when supplying power to the low bridge driving circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911168869.6A CN112829587A (en) | 2019-11-25 | 2019-11-25 | Motor controller active discharge system used in low-voltage electric fault |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911168869.6A CN112829587A (en) | 2019-11-25 | 2019-11-25 | Motor controller active discharge system used in low-voltage electric fault |
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| CN112829587A true CN112829587A (en) | 2021-05-25 |
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| CN201911168869.6A Pending CN112829587A (en) | 2019-11-25 | 2019-11-25 | Motor controller active discharge system used in low-voltage electric fault |
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Application publication date: 20210525 |
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| RJ01 | Rejection of invention patent application after publication |