CN111211540A - Active short circuit method for preventing torque impact - Google Patents
Active short circuit method for preventing torque impact Download PDFInfo
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- CN111211540A CN111211540A CN202010062490.3A CN202010062490A CN111211540A CN 111211540 A CN111211540 A CN 111211540A CN 202010062490 A CN202010062490 A CN 202010062490A CN 111211540 A CN111211540 A CN 111211540A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
- H02H7/0855—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load avoiding response to transient overloads, e.g. during starting
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Abstract
The invention discloses an active short circuit method for preventing torque impact, which comprises the steps that a direct current high-voltage detection circuit detects direct current bus voltage, a speed detection circuit detects the rotating speed of a motor, and if the bus voltage reaches a voltage threshold value or the received rotating speed of the motor reaches a speed threshold value, an active short circuit mode is entered; giving a PWM waveform with a small duty ratio to three transistors of a high-voltage side bridge arm in the three-phase bridge type inverter circuit, and turning off the three transistors of the low-voltage side bridge arm; gradually increasing the duty ratio of PWM waveforms of three transistors of a high-voltage side bridge arm; when the duty ratios of the PWM waveforms of the three transistors of the high-voltage side bridge arm reach preset values, controlling the three transistors of the high-voltage side bridge arm to be completely switched on; and if the rotating speed of the motor is lower than the rated rotating speed, controlling all three transistors of the high-voltage side bridge arm to be turned off, and stopping the motor in a wave-sealing mode. The invention adopts a method of changing duty ratio, reduces torque impact, improves driving comfort performance and protects a vehicle power system and personal safety.
Description
Technical Field
The invention belongs to the technical field of motor control software algorithms, and particularly relates to an active short circuit method for preventing torque impact.
Background
At present, most of electric automobiles adopt an active short circuit mode to prevent further damage of a system after a motor control system is out of control, so that a power system is protected. However, the active short circuit mode can generate large torque impact, so that the vehicle shakes severely, and the comfort performance is affected.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an active short circuit method for preventing torque impact aiming at the defects of the prior art, and the active short circuit method for preventing torque impact adopts a method of changing duty ratio, so that torque impact is reduced, driving comfort is improved, and a vehicle power system and personal safety are protected.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
an active short circuit method for preventing torque impact comprises a motor three-phase line, a three-phase bridge inverter circuit, a direct-current high-voltage detection circuit, an IGBT drive circuit, a DSP chip and a speed detection circuit, wherein the direct-current high-voltage detection circuit, the IGBT drive circuit and the speed detection circuit are all connected with the DSP chip, the direct-current high-voltage detection circuit is connected with a direct-current bus, the direct-current bus is connected with the motor three-phase line through the three-phase bridge inverter circuit, the three-phase bridge inverter circuit is connected with the IGBT drive circuit, and the speed detection circuit is connected with a rotary transformer in the motor;
the method specifically comprises the following steps:
(1) the direct-current high-voltage detection circuit detects direct-current bus voltage and sends a signal to the DSP chip, the speed detection circuit detects the motor rotating speed and sends a signal to the DSP chip, the DSP chip judges whether the received bus voltage reaches a voltage threshold or whether the received motor rotating speed reaches a speed threshold, and if the bus voltage reaches the voltage threshold or the received motor rotating speed reaches the speed threshold, the active short-circuit mode is entered;
(2) the IGBT driving circuit drives the three-phase bridge type inverter circuit to work under the control of the DSP chip, and the IGBT driving circuit gives a PWM waveform with a small duty ratio to three transistors of a high-voltage side bridge arm in the three-phase bridge type inverter circuit and turns off the three transistors of a low-voltage side bridge arm;
(3) according to a certain period, the duty ratios of PWM waveforms of three transistors of a high-voltage side bridge arm are gradually increased through an IGBT driving circuit;
(4) when the duty ratios of PWM waveforms of the three transistors of the high-voltage side bridge arm reach preset values, controlling the three transistors of the high-voltage side bridge arm to be completely switched on through an IGBT driving circuit;
(5) the speed detection circuit detects the rotating speed of the motor in real time, and if the rotating speed of the motor is lower than the rated rotating speed, the DSP chip controls all three transistors of the high-voltage side bridge arm to be turned off through the IGBT driving circuit, and the wave-sealing machine is stopped.
The technical scheme is further improved by the invention, the three-phase current detection circuit is further included and is connected with three phase lines of the motor, the three-phase current detection circuit detects the current in the three phase lines of the motor in real time and sends a signal to the DSP chip, the DSP chip judges whether the received current exceeds a current preset value, if so, the DSP chip controls all three transistors of a high-voltage side bridge arm to be turned off through the IGBT driving circuit, and the wave-sealing machine is stopped.
The invention has the beneficial effects that: the invention adopts a method of changing duty ratio, reduces the torque impact caused by active short circuit, improves the driving comfort performance and protects the vehicle power system and personal safety. When the duty ratio of the upper three tubes in the three-phase bridge type inverter circuit is gradually increased, the rotating speed of the motor is gradually reduced until the rotating speed of the motor is lower than the rated rotating speed, and the wave sealing is stopped to finish short-circuit protection.
Drawings
Fig. 1 is a schematic circuit diagram of the present embodiment.
Fig. 2 is a flowchart of the operation of the present embodiment.
Detailed Description
The following further illustrates embodiments of the invention with reference to fig. 1 and 2:
as shown in fig. 1, the embodiment provides an active short-circuit method for preventing torque shock, which includes a three-phase line UVW of a motor, a three-phase bridge inverter circuit, a direct-current high-voltage detection circuit, an IGBT driving circuit, a three-phase current detection circuit, a module temperature detection circuit, a DSP chip, and a speed detection circuit. The direct-current high-voltage detection circuit, the IGBT driving circuit, the three-phase current detection circuit and the speed detection circuit are all connected with the DSP chip. The direct-current high-voltage detection circuit is connected with the direct-current bus and used for detecting the voltage of the direct-current bus. And the direct current bus is connected with a three-phase line UVW of the motor through a three-phase bridge type inverter circuit. And the three-phase bridge inverter circuit is connected with the IGBT driving circuit. The speed detection circuit is connected with a rotary transformer in the motor and used for detecting the rotating speed of the motor. The three-phase current detection circuit is connected with a three-phase line UVW of the motor and is used for respectively detecting currents of the three-phase line UVW of the motor.
As shown in fig. 2, the active short-circuiting method specifically includes the following steps:
(1) the method comprises the steps that a direct-current high-voltage detection circuit detects direct-current bus voltage and sends signals to a DSP chip, a speed detection circuit detects motor rotating speed and sends signals to the DSP chip, the DSP chip judges whether the received bus voltage reaches a voltage threshold value 1 or whether the received motor rotating speed reaches a speed threshold value 2, and if the bus voltage reaches the voltage threshold value 1 or the received motor rotating speed reaches the speed threshold value 2, an active short-circuit mode is started;
(2) after the three-phase bridge inverter enters an active short-circuit mode, an IGBT driving circuit drives a three-phase bridge inverter circuit to work under the control of a DSP chip, the IGBT driving circuit gives a PWM waveform with a small duty ratio to three transistors V11, V21 and V31 (upper three tubes) of a high-voltage side bridge arm in the three-phase bridge inverter circuit, and three transistors V12, V22 and V32 (lower three tubes) of a low-voltage side bridge arm are turned off;
(3) according to a certain period, the DSP chip gradually increases the duty ratio of PWM waveforms of three transistors V11, V21 and V31 of a high-voltage side bridge arm through an IGBT driving circuit, for example, the duty ratio is increased by 2% according to each switching period;
(4) when the duty ratio of the PWM waveforms of the three transistors V11, V21 and V31 of the high-voltage side bridge arm reaches 98%, the three transistors V11, V21 and V31 of the high-voltage side bridge arm are controlled to be directly and completely switched on through an IGBT (insulated gate bipolar transistor) driving circuit, so that the three phase lines U, V and W are in short circuit through the IGBT, and the condition of short circuit of the three phase lines is realized;
(5) the impact torque generated by active short circuit after field weakening is smaller, and the impact torque can be generated by short circuit below the rated rotating speed of the motor; therefore, the speed detection circuit detects the rotating speed of the motor in real time, if the rotating speed of the motor is lower than the rated rotating speed, the DSP chip controls all three transistors V11, V21 and V31 of a high-voltage side bridge arm to be switched off through the IGBT driving circuit, the wave is directly sealed, and the controller and the motor are protected from running at an excessive speed;
(6) the three-phase current detection circuit also detects the current in the three-phase line UVW of the motor in real time and sends a signal to the DSP chip, the DSP chip judges whether the received current exceeds a current preset value, if the current exceeds the current preset value, the DSP chip controls all three transistors V11, V21 and V31 of a high-voltage side bridge arm to be turned off through the IGBT driving circuit, wave sealing is directly conducted, the machine is shut down, and the controller and the motor are protected from running in an overspeed mode.
The module temperature detection circuit in fig. 1 is connected with the DSP chip, and the module temperature detection circuit detects the temperature of the transistor in each bridge arm in the three-phase bridge inverter circuit in real time and sends a signal to the DSP chip, and when the temperature of the transistor exceeds a preset temperature, the DSP chip can control the transistor in each bridge arm to stop working through the IGBT driving circuit.
The embodiment adopts a method of changing duty ratio, reduces torque impact caused by active short circuit, improves driving comfort performance, and protects a vehicle power system and personal safety. In the embodiment, when the duty ratio of the upper three pipes is gradually increased, the rotating speed of the motor is gradually reduced until the rotating speed of the motor is lower than the rated rotating speed, the sealing wave stops, and the short-circuit protection is completed.
The scope of the present invention includes, but is not limited to, the above embodiments, and the present invention is defined by the appended claims, and any alterations, modifications, and improvements that may occur to those skilled in the art are all within the scope of the present invention.
Claims (2)
1. An active short-circuit method for preventing torque shock, characterized in that: the device comprises a three-phase line of a motor, a three-phase bridge inverter circuit, a direct-current high-voltage detection circuit, an IGBT (insulated gate bipolar transistor) driving circuit, a DSP (digital signal processor) chip and a speed detection circuit, wherein the direct-current high-voltage detection circuit, the IGBT driving circuit and the speed detection circuit are all connected with the DSP chip;
the method specifically comprises the following steps:
(1) the direct-current high-voltage detection circuit detects direct-current bus voltage and sends a signal to the DSP chip, the speed detection circuit detects the motor rotating speed and sends a signal to the DSP chip, the DSP chip judges whether the received bus voltage reaches a voltage threshold or whether the received motor rotating speed reaches a speed threshold, and if the bus voltage reaches the voltage threshold or the received motor rotating speed reaches the speed threshold, the active short-circuit mode is entered;
(2) the IGBT driving circuit drives the three-phase bridge type inverter circuit to work under the control of the DSP chip, and the IGBT driving circuit gives a PWM waveform with a small duty ratio to three transistors of a high-voltage side bridge arm in the three-phase bridge type inverter circuit and turns off the three transistors of a low-voltage side bridge arm;
(3) according to a certain period, the duty ratios of PWM waveforms of three transistors of a high-voltage side bridge arm are gradually increased through an IGBT driving circuit;
(4) when the duty ratios of PWM waveforms of the three transistors of the high-voltage side bridge arm reach preset values, controlling the three transistors of the high-voltage side bridge arm to be completely switched on through an IGBT driving circuit;
(5) the speed detection circuit detects the rotating speed of the motor in real time, and if the rotating speed of the motor is lower than the rated rotating speed, the DSP chip controls all three transistors of the high-voltage side bridge arm to be turned off through the IGBT driving circuit, and the wave-sealing machine is stopped.
2. The active short-circuiting method for preventing torque shock according to claim 1, wherein: the three-phase current detection circuit is connected with three phase lines of the motor, the three-phase current detection circuit detects currents in the three phase lines of the motor in real time and sends signals to the DSP chip, the DSP chip judges whether the received currents exceed a current preset value or not, if the received currents exceed the current preset value, the DSP chip controls all three transistors of a high-voltage side bridge arm to be turned off through the IGBT driving circuit, and wave-sealing shutdown is carried out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010062490.3A CN111211540A (en) | 2020-01-20 | 2020-01-20 | Active short circuit method for preventing torque impact |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010062490.3A CN111211540A (en) | 2020-01-20 | 2020-01-20 | Active short circuit method for preventing torque impact |
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| CN111211540A true CN111211540A (en) | 2020-05-29 |
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| CN202010062490.3A Withdrawn CN111211540A (en) | 2020-01-20 | 2020-01-20 | Active short circuit method for preventing torque impact |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113395018A (en) * | 2021-06-21 | 2021-09-14 | 昆山环正电子有限公司 | Flexible braking method for electric tool |
| CN113479065A (en) * | 2021-07-29 | 2021-10-08 | 中国第一汽车股份有限公司 | Motor active short circuit control circuit and driving method thereof |
| CN113708344A (en) * | 2021-08-17 | 2021-11-26 | 精进电动科技股份有限公司 | Overvoltage protection method and circuit for inverter direct-current bus and motor controller |
| CN114261284A (en) * | 2021-12-16 | 2022-04-01 | 奇瑞新能源汽车股份有限公司 | Fault control method and device for electric drive system, vehicle and storage medium |
| EP4387079A1 (en) * | 2022-12-16 | 2024-06-19 | Valeo Equipements Electriques Moteur | System for controlling a voltage converter |
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| EP0792008A2 (en) * | 1996-02-21 | 1997-08-27 | Kabushiki Kaisha Meidensha | Method and apparatus for protecting switching element of inverter from being overheated |
| CN105656370A (en) * | 2016-03-09 | 2016-06-08 | 广东美的制冷设备有限公司 | Air conditioner and shutdown control method and device for compressor of air conditioner |
| CN105958871A (en) * | 2016-03-09 | 2016-09-21 | 广东美的制冷设备有限公司 | Air conditioner and compressor thereof shutdown control method and device |
| CN109905068A (en) * | 2019-03-13 | 2019-06-18 | 阳光电源股份有限公司 | Electric machine controller and its active short circuit current and method |
| CN110022091A (en) * | 2019-04-17 | 2019-07-16 | 辽宁石油化工大学 | Permanent torque starting and overload intelligent protection method and the device of a kind of direct current generator |
-
2020
- 2020-01-20 CN CN202010062490.3A patent/CN111211540A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0792008A2 (en) * | 1996-02-21 | 1997-08-27 | Kabushiki Kaisha Meidensha | Method and apparatus for protecting switching element of inverter from being overheated |
| CN105656370A (en) * | 2016-03-09 | 2016-06-08 | 广东美的制冷设备有限公司 | Air conditioner and shutdown control method and device for compressor of air conditioner |
| CN105958871A (en) * | 2016-03-09 | 2016-09-21 | 广东美的制冷设备有限公司 | Air conditioner and compressor thereof shutdown control method and device |
| CN109905068A (en) * | 2019-03-13 | 2019-06-18 | 阳光电源股份有限公司 | Electric machine controller and its active short circuit current and method |
| CN110022091A (en) * | 2019-04-17 | 2019-07-16 | 辽宁石油化工大学 | Permanent torque starting and overload intelligent protection method and the device of a kind of direct current generator |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113395018A (en) * | 2021-06-21 | 2021-09-14 | 昆山环正电子有限公司 | Flexible braking method for electric tool |
| CN113479065A (en) * | 2021-07-29 | 2021-10-08 | 中国第一汽车股份有限公司 | Motor active short circuit control circuit and driving method thereof |
| CN113479065B (en) * | 2021-07-29 | 2023-01-10 | 中国第一汽车股份有限公司 | Motor active short circuit control circuit and driving method thereof |
| CN113708344A (en) * | 2021-08-17 | 2021-11-26 | 精进电动科技股份有限公司 | Overvoltage protection method and circuit for inverter direct-current bus and motor controller |
| CN113708344B (en) * | 2021-08-17 | 2024-03-26 | 精进电动科技股份有限公司 | Overvoltage protection method and circuit for DC bus of inverter and motor controller |
| CN114261284A (en) * | 2021-12-16 | 2022-04-01 | 奇瑞新能源汽车股份有限公司 | Fault control method and device for electric drive system, vehicle and storage medium |
| EP4387079A1 (en) * | 2022-12-16 | 2024-06-19 | Valeo Equipements Electriques Moteur | System for controlling a voltage converter |
| FR3143912A1 (en) * | 2022-12-16 | 2024-06-21 | Valeo Equipements Electriques Moteur | Control system of a voltage converter |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20210421 Address after: Room 202, 2nd Floor, Block B, Building 11, No. 8 Courtyard, Liangshuihe Second Street, Beijing Daxing District, Beijing Applicant after: PHASE GREEN ENERGY TECHNOLOGY (BEIJING) Co.,Ltd. Address before: 315336 No. two, 248 Binhai New Area, Hangzhou Bay, Zhejiang, Ningbo Applicant before: FISH GREEN ENERGY TECHNOLOGY (NINGBO) Co.,Ltd. |
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20200529 |
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| WW01 | Invention patent application withdrawn after publication |