CN115296591A - Active discharging system and method of motor controller - Google Patents
Active discharging system and method of motor controller Download PDFInfo
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- CN115296591A CN115296591A CN202211129023.3A CN202211129023A CN115296591A CN 115296591 A CN115296591 A CN 115296591A CN 202211129023 A CN202211129023 A CN 202211129023A CN 115296591 A CN115296591 A CN 115296591A
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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
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
- H02P29/0241—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load the fault being an overvoltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
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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
- H02M1/322—Means for rapidly discharging a capacitor of the converter for protecting electrical components or for preventing electrical shock
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Abstract
The invention provides an active discharge system and method of a motor controller, wherein the active discharge system comprises: a low voltage battery source; the isolation power supply is electrically connected with the low-voltage battery source; the signal isolation module is electrically connected with the isolation power supply and is externally connected with a microcontroller; the time delay discharging module is electrically connected with the isolation power supply and the signal isolation module; the discharge driving module is electrically connected with the time delay discharge module; the abnormity protection module is electrically connected with the emergency power supply, the isolation power supply and the discharge driving module; the high-voltage capacitor stores redundant electric quantity and is electrically connected with the emergency power supply and the abnormal protection module; and the discharge execution module is electrically connected with the discharge driving module and the high-voltage capacitor. After the technical scheme is adopted, the active discharge can be executed under the low-voltage abnormal condition, and meanwhile, the overheating damage of the active discharge resistor caused by the fact that the high-voltage battery is not disconnected can be avoided.
Description
Technical Field
The invention relates to the field of motor controllers, in particular to an active discharge system and method of a motor controller.
Background
The existing motor controller actively discharges by adopting a discharge resistor, in order to save cost, the selected discharge resistor generally has low power and can only bear normal discharge power, and when the adhesion of the main relay of the whole motor and other abnormal discharge conditions occur, the problem that the discharge resistor is easily burnt is easily caused.
In order to solve the above problems, in the prior art, a method for determining the bus voltage of the motor controller by software logic to perform an operation of rapidly protecting the active discharge resistor is proposed, but in these solutions, the discharge logic cannot meet the requirement of low-voltage abnormal discharge, that is, when the low-voltage battery is powered off, the high-voltage capacitor still has excess electric quantity, and cannot be protected.
Therefore, a new active discharge system and method for a motor controller are needed, which realize safe operation of an active discharge resistor of the motor controller through a hardware fast protection circuit.
Disclosure of Invention
In order to overcome the above technical drawbacks, an object of the present invention is to provide an active discharge system and method for a motor controller, which can perform active discharge under a low-voltage abnormal condition and ensure that the active discharge resistor is not damaged due to overheating caused by the non-disconnection of the high-voltage battery.
The invention discloses an active discharge system of a motor controller, which comprises:
a low voltage battery source;
an isolated power supply electrically connected to the low voltage battery source;
the signal isolation module is electrically connected with the isolation power supply and is externally connected with a microcontroller;
the time delay discharge module is electrically connected with the isolation power supply and the signal isolation module;
the discharge driving module is electrically connected with the time delay discharge module;
the abnormity protection module is electrically connected with the emergency power supply, the isolation power supply and the discharge driving module;
the high-voltage capacitor stores redundant electric quantity and is electrically connected with the emergency power supply and the abnormal protection module;
the discharge execution module is electrically connected with the discharge driving module and the high-voltage capacitor;
when the primary power supply of the microcontroller and the signal isolation module is abnormally lost, the microcontroller generates a discharge signal to the signal isolation module, or the isolation power supply sends a low-voltage signal to the signal isolation module, the signal isolation module sends a discharge request signal to the delay discharge module, the delay discharge module generates a discharge delay signal to the discharge driving module based on the discharge request signal, and the discharge driving module generates a driving signal to the discharge execution module based on the discharge delay signal, so that the discharge execution module discharges redundant electric quantity to the high-voltage capacitor, and the output voltage of the high-voltage capacitor is lower than a voltage threshold.
Preferably, the emergency power supply and the low-voltage battery source supply power to the isolation power supply together, and the second input voltage provided by the low-voltage battery source to the isolation power supply is smaller than the first input voltage provided by the low-voltage battery source to the isolation power supply when the power is not lost;
the isolation power supply respectively supplies power to the abnormal protection module, the signal isolation module, the time delay discharge module and the discharge driving module.
Preferably, the abnormality protection module monitors an output voltage value of the high-voltage capacitor, and a voltage drop slope circuit is preset in the abnormality protection module and records a voltage threshold, a slope threshold and a discharge duration threshold;
when the low-voltage battery source is power-off, the isolation power supply sends a low-voltage signal to the abnormal protection module, and after the discharge time length threshold value is reached, the abnormal protection module monitors that the output voltage value is higher than the voltage threshold value, and generates an interrupt signal to the discharge driving module, so that the reset driving signal closes the discharge execution module.
Preferably, when the abnormality protection module monitors that the output voltage falling slope of the high-voltage capacitor is higher than the slope threshold value, so that the output voltage value is lower than the voltage threshold value, the discharging execution module continuously controls the high-voltage capacitor to discharge the surplus power until the output voltage value is lower than 55V.
Preferably, the active discharge system further comprises:
the voltage sampling module is electrically connected with the microcontroller and the abnormity protection module respectively;
when the abnormal protection module monitors that the output voltage falling slope of the high-voltage capacitor is higher than the slope threshold, the microcontroller acquires a bus voltage value of the motor controller from the voltage sampling module within a preset time period;
when the bus voltage value is smaller than a desired value, the discharge execution module continuously controls the high-voltage capacitor to discharge the redundant electric quantity;
when the bus voltage value is larger than a desired value, the abnormal protection module generates an interrupt signal to the discharge driving module within the discharge duration threshold value so as to reset the driving signal to close the discharge execution module, and the microcontroller sends the discharge signal again after an interval time and repeats the operation for n times.
The invention also discloses an active discharging method of the motor controller, which comprises the following steps:
configuring an active discharge circuit comprising: a low voltage battery source; the isolation power supply is electrically connected with the low-voltage battery source; the signal isolation module is electrically connected with the isolation power supply and is externally connected with a microcontroller; the time delay discharge module is electrically connected with the isolation power supply and the signal isolation module; the discharge driving module is electrically connected with the time delay discharge module; the abnormity protection module is electrically connected with the emergency power supply, the isolation power supply and the discharge driving module; the high-voltage capacitor stores redundant electric quantity and is electrically connected with the emergency power supply and the abnormal protection module; the discharge execution module is electrically connected with the discharge driving module and the high-voltage capacitor;
when the primary power supply of the microcontroller and the signal isolation module is abnormally lost, the microcontroller generates a discharge signal to the signal isolation module, or the isolation power supply sends a low-voltage signal to the signal isolation module, the signal isolation module sends a discharge request signal to the delay discharge module, the delay discharge module generates a discharge delay signal to the discharge driving module based on the discharge request signal, and the discharge driving module generates a driving signal to the discharge execution module based on the discharge delay signal, so that the discharge execution module discharges redundant electric quantity to the high-voltage capacitor, and the output voltage of the high-voltage capacitor is lower than a voltage threshold.
Preferably, the emergency power supply and the low-voltage battery source supply power to the isolation power supply together, and the second input voltage provided by the low-voltage battery source to the isolation power supply is smaller than the first input voltage provided by the low-voltage battery source to the isolation power supply when the power is not lost;
the isolation power supply respectively supplies power to the abnormal protection module, the signal isolation module, the time delay discharge module and the discharge driving module.
Preferably, the abnormality protection module monitors an output voltage value of the high-voltage capacitor, and a voltage drop slope circuit is preset in the abnormality protection module and records a voltage threshold, a slope threshold and a discharge duration threshold;
when the low-voltage battery source is power-off, the isolation power supply sends a low-voltage signal to the abnormal protection module, and after the discharge time length threshold value is reached, the abnormal protection module monitors that the output voltage value is higher than the voltage threshold value, an interrupt signal is generated to the discharge driving module, and the discharge execution module is closed by the reset driving signal.
Preferably, when the abnormality protection module monitors that the output voltage falling slope of the high-voltage capacitor is higher than the slope threshold value, so that the output voltage value is lower than the voltage threshold value, the discharge execution module continuously controls the high-voltage capacitor to discharge the surplus electric quantity until the output voltage value is lower than 55V.
After the technical scheme is adopted, compared with the prior art, the method has the following beneficial effects:
1. the module forming the active discharge control circuit is powered by the low-voltage battery source and the emergency power supply at the same time, so that the active discharge circuit can still normally operate under the condition of low-voltage abnormal power failure, and the high-voltage capacitor voltage is discharged to be below a safety value within a specified time;
2. the discharge resistors are quickly protected through hardware, the number or the volume of the active discharge resistors is optimized, and the cost is reduced;
3. due to the fact that the hardware detection abnormity protection time is short, multiple discharge attempts can be achieved under the condition that the discharge resistance is not increased, and system robustness is improved.
Drawings
Fig. 1 is a schematic diagram of an active discharge system of a motor controller according to a preferred embodiment of the present invention.
Detailed Description
The advantages of the invention are further illustrated by the following detailed description of the preferred embodiments in conjunction with the drawings.
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below do not represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure. The word "if" as used herein may be interpreted as "at" \8230; "or" when 8230; \8230; "or" in response to a determination ", depending on the context.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be interpreted broadly, and may be, for example, a mechanical connection or an electrical connection, a communication between two elements, a direct connection, or an indirect connection via an intermediate medium, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
In the following description, suffixes such as "module", "part", or "unit" used to indicate elements are used only for facilitating the description of the present invention, and do not have a specific meaning per se. Thus, "module" and "component" may be used in a mixture.
Referring to fig. 1, a schematic structural diagram of an active discharge system of a motor controller according to a preferred embodiment of the present invention is shown, in which the active discharge system includes:
-low voltage battery source
The low-voltage battery source is used as a main power supply of the motor controller, usually with a voltage value of 9-12V, for example, a battery of an electric vehicle with the motor controller, to supply the electrical energy required by the electrical load connected to the low-voltage battery source.
-isolated power supply
Isolated power generally refers to a high voltage being reduced to a low voltage by a transformer and rectified to direct current. The conversion process has no electric shock hazard because the conversion process is not connected with the ground. The isolation power supply is electrically connected with the low-voltage battery source and obtains electric energy from the low-voltage battery source.
-signal isolation module
The signal isolation module is electrically connected with the isolation power supply and is externally connected with a Microcontroller (MCU) for receiving control signals from the microcontroller and isolating external signals from other module signals in the active discharge circuit. The power for the signal isolation module is sourced from the P5V _ HV output of the isolated power supply.
-a time-delay discharge module
The time-delay discharge module is electrically connected with the isolation power supply and the signal isolation module, obtains electric energy from the isolation power supply (for example, through a P15V _ HV output end of the isolation power supply), receives a control signal in the form of Adis _ req _ HV from the signal isolation module, and delays the sending of a further control signal according to the design of an internal circuit.
-discharge driving module
The discharge driving module is electrically connected to the isolated power supply (e.g., via the P15V _ HV output of the isolated power supply) and the delayed discharge module, and forms a driving signal according to the control signal after the delayed discharge module delays sending a further control signal.
-an anomaly protection module
The abnormal protection module is used for actively discharging the devices in the active discharge system of the motor controller when a fault occurs (such as the adhesion of the relay mentioned above or when a user expects to actively discharge), is connected with the isolation power supply, is supplied with electric energy by the isolation power supply (such as through a P10V _ HV output end of the isolation power supply), and is electrically connected with the discharge driving module so as to send a control signal for adjusting the driving signal to the discharge driving module.
-high voltage capacitance
The high-voltage capacitor is isolated from the discharge execution module, redundant electric quantity is stored in the high-voltage capacitor, the high-voltage capacitor is electrically connected with the emergency power supply and the abnormal protection module, and partial electric quantity of the high-voltage capacitor is transmitted to the emergency power supply so as to increase the cruising ability of the emergency power supply.
-a discharge execution module
The discharge execution module is electrically connected with the discharge driving module and the high-voltage capacitor so as to control whether the high-voltage capacitor is discharged or not according to a driving signal of the discharge driving module.
Specifically, when the signal isolation module receives a discharge signal from the microcontroller (for example, according to a request of a user, an active discharge demand is actively formed in the MCU) or the isolation power source sends a low voltage signal to the signal isolation module (due to abnormal loss of the primary power source of the microcontroller and the signal isolation module), the signal isolation module sends a discharge request signal to the delay discharge module, so that the Adis _ req _ HV signal is converted into an active state, the delay discharge module generates a discharge delay signal (Adis _ req _ delay signal) based on the discharge request signal, and sends the discharge delay signal to the discharge driving module at an interval, and the discharge driving module generates a driving signal (Adis _ con signal) to the discharge execution module based on the discharge delay signal, so that the discharge execution module is turned on, and if the high-voltage capacitor is disconnected from the high-voltage battery at this time, the excess electric quantity may be discharged to the high-voltage capacitor through the discharge execution module until an expected value is lower than a voltage threshold (60V). On the other hand, if the voltage of the high-voltage capacitor monitored by the abnormal protection module is not discharged as expected on the basis of the discharge signal, so that the bus voltage is not reduced as required, the discharge driving module is turned off, and the discharge operation of the discharge execution module is stopped.
With the above configuration, one active discharge operation can be performed without losing the overtime protection function when the low-voltage battery source is abnormal.
In a preferred embodiment, the emergency power supply and the low-voltage battery source supply power to the isolation power supply together, but the voltage is lower when the connection between the emergency power supply and the isolation power supply is hung, so that the low-voltage battery source supplies power during normal operation, so that the second input voltage provided by the low-voltage battery source to the isolation power supply is smaller than the first input voltage provided by the low-voltage battery source to the isolation power supply when the low-voltage battery source is not powered off, and the emergency power supply can supply power when the low-voltage battery source is powered off. Furthermore, a diode is arranged between the emergency power supply and the low-voltage battery source and between the emergency power supply and the isolation power supply respectively to prevent the current from flowing backwards. And on the other side, the isolation power supply supplies power to the abnormal protection module, the signal isolation module, the time delay discharge module and the discharge driving module respectively, so that the isolation power supply can still supply power to the modules even if the low-voltage battery source loses power, and the active discharge circuit formed by the modules can work normally.
Further, when the abnormal protection module is electrically connected with the high-voltage capacitor, the output voltage value of the high-voltage capacitor is constantly monitored to determine whether the redundant electric quantity of the high-voltage capacitor is discharged when the relay adhesion fault occurs, and a voltage falling slope circuit is preset in the abnormal protection module and records the voltage threshold, a slope threshold and a discharging duration threshold. The exception protection module will start timing from the following time: when the low-voltage battery source is power-off, the isolation power supply sends a low-voltage signal to the abnormal protection module, and after the discharging time threshold value, whether the redundant electric quantity of the high-voltage capacitor is normally discharged or not is determined within a specified time, and when the abnormal protection module monitors that the output voltage value is higher than the voltage threshold value, the abnormal protection module indicates that the high-voltage capacitor cannot be normally discharged, and accordingly, the abnormal protection module generates an interrupt signal (OTP signal) to the discharging driving module so as to reset the driving signal to close the discharging execution module. In other words, the above process may be performed continuously, i.e., continuously resetting and enabling the Adis _ req signal.
In the above embodiment, when the abnormal protection module monitors that the slope of the output voltage drop of the high-voltage capacitor is higher than the slope threshold, so that the high-voltage capacitor is discharged to a desired value when the output voltage drops below 60V, the discharging may not be continued, and in some embodiments, the high-voltage capacitor may be configured to discharge until the output voltage value is lower than 55V, that is, when the emergency power supply generally adopts a configuration of 55V to 900V, the high-voltage capacitor does not give part of the electric quantity to the emergency power supply.
Further preferably, the active discharge system further comprises: the voltage sampling module is respectively and electrically connected with the microcontroller and the abnormal protection module, and is connected with a busbar of the motor controller so as to sample the voltage of the busbar; when the abnormal protection module monitors that the output voltage falling slope of the high-voltage capacitor is higher than a slope threshold value, the microcontroller acquires a bus voltage value of the motor controller from the voltage sampling module within a preset time period; when the bus voltage value is smaller than a desired value, the influence of the discharge of the high-voltage capacitor on the bus voltage is in a desired state, and the discharge execution module continuously controls the high-voltage capacitor to discharge the redundant electric quantity; when the bus voltage value is greater than an expected value, which indicates that a fault may occur in the bleeding process, the abnormal protection module generates an interrupt signal to the discharging driving module within the discharging duration threshold value, so as to reset the driving signal to close the discharging execution module, and the microcontroller issues the discharging signal again after an interval time until normal bleeding occurs, if the bleeding fault still occurs, and repeats n times (for example, 5 times), but after n times of attempts, the interval time is increased, and the attempts are repeated again.
The invention also discloses an active discharging method of the motor controller, which comprises the following steps: configuring an active discharge circuit comprising: a low voltage battery source; the isolation power supply is electrically connected with the low-voltage battery source; the signal isolation module is electrically connected with the isolation power supply and is externally connected with a microcontroller; the time delay discharging module is electrically connected with the isolation power supply and the signal isolation module; the discharge driving module is electrically connected with the time delay discharge module; the abnormal protection module is electrically connected with the emergency power supply, the isolation power supply and the discharge driving module; the high-voltage capacitor stores redundant electric quantity and is electrically connected with the emergency power supply and the abnormal protection module; the discharge execution module is electrically connected with the discharge driving module and the high-voltage capacitor; when the primary power supply of the microcontroller and the signal isolation module is abnormally lost, the microcontroller generates a discharge signal to the signal isolation module, or the isolation power supply sends a low-voltage signal to the signal isolation module, the signal isolation module sends a discharge request signal to the delay discharge module, the delay discharge module generates a discharge delay signal to the discharge driving module based on the discharge request signal, and the discharge driving module generates a driving signal to the discharge execution module based on the discharge delay signal, so that the discharge execution module discharges redundant electric quantity to the high-voltage capacitor, and the output voltage of the high-voltage capacitor is lower than a voltage threshold.
Preferably, the emergency power supply and the low-voltage battery source supply power to the isolation power supply together, and the second input voltage provided by the low-voltage battery source to the isolation power supply is smaller than the first input voltage provided by the low-voltage battery source to the isolation power supply when the power is not lost; the isolation power supply respectively supplies power to the abnormal protection module, the signal isolation module, the time delay discharge module and the discharge driving module.
Preferably, the abnormality protection module monitors an output voltage value of the high-voltage capacitor, and a voltage drop slope circuit is preset in the abnormality protection module and records a voltage threshold, a slope threshold and a discharge duration threshold; when the low-voltage battery source is power-off, the isolation power supply sends a low-voltage signal to the abnormal protection module, and after the discharge time length threshold value is reached, the abnormal protection module monitors that the output voltage value is higher than the voltage threshold value, and generates an interrupt signal to the discharge driving module, so that the reset driving signal closes the discharge execution module.
Preferably, when the abnormality protection module monitors that the output voltage falling slope of the high-voltage capacitor is higher than the slope threshold value, so that the output voltage value is lower than the voltage threshold value, the discharge execution module continuously controls the high-voltage capacitor to discharge the surplus electric quantity until the output voltage value is lower than 55V.
It should be noted that the embodiments of the present invention have been described in terms of preferred embodiments, and not by way of limitation, and that those skilled in the art can make modifications and variations of the embodiments described above without departing from the spirit of the invention.
Claims (9)
1. An active discharge system of a motor controller, the active discharge system comprising:
a low voltage battery source;
an isolated power supply electrically connected to the low voltage battery source;
the signal isolation module is electrically connected with the isolation power supply and is externally connected with a microcontroller;
the time delay discharge module is electrically connected with the isolation power supply and the signal isolation module;
the discharge driving module is electrically connected with the time delay discharge module;
the abnormity protection module is electrically connected with the emergency power supply, the isolation power supply and the discharge driving module;
the high-voltage capacitor stores redundant electric quantity and is electrically connected with the emergency power supply and the abnormal protection module;
the discharge execution module is electrically connected with the discharge driving module and the high-voltage capacitor;
when the primary power supply of the microcontroller and the signal isolation module is abnormally lost, the microcontroller generates a discharge signal to the signal isolation module, or the isolation power supply sends a low-voltage signal to the signal isolation module, the signal isolation module sends a discharge request signal to the delay discharge module, the delay discharge module generates a discharge delay signal to the discharge driving module based on the discharge request signal, and the discharge driving module generates a driving signal to the discharge execution module based on the discharge delay signal, so that the discharge execution module discharges redundant electric quantity to the high-voltage capacitor, and the output voltage of the high-voltage capacitor is lower than a voltage threshold.
2. The active discharge system of claim 1,
the emergency power supply and the low-voltage battery source jointly supply power to the isolation power supply, and a second input voltage provided by the low-voltage battery source to the isolation power supply is smaller than a first input voltage provided by the low-voltage battery source to the isolation power supply when the power is not lost; the isolation power supply supplies power to the abnormal protection module, the signal isolation module, the time delay discharge module and the discharge driving module respectively.
3. The active discharge system of claim 2,
the abnormal protection module monitors the output voltage value of the high-voltage capacitor, a voltage reduction slope circuit is preset in the abnormal protection module, and the voltage reduction slope circuit records the voltage threshold, a slope threshold and a discharge duration threshold;
and generating an interrupt signal to the discharge driving module by the abnormity protection module after the low-voltage battery source loses power to enable the isolation power supply to send a low-voltage signal to the abnormity protection module and after the discharge time length threshold value is reached, and monitoring that the output voltage value is higher than the voltage threshold value by the abnormity protection module so as to reset the driving signal to close the discharge execution module.
4. The active discharge system of claim 3,
when the abnormal protection module monitors that the output voltage falling slope of the high-voltage capacitor is higher than the slope threshold value, so that the output voltage value is lower than the voltage threshold value, the discharge execution module continuously controls the high-voltage capacitor to discharge the surplus electric quantity until the output voltage value is lower than 55V.
5. The active discharge system of claim 4, further comprising:
the voltage sampling module is electrically connected with the microcontroller and the abnormal protection module respectively;
when the abnormal protection module monitors that the output voltage falling slope of the high-voltage capacitor is higher than the slope threshold value, the microcontroller acquires a bus voltage value of the motor controller from the voltage sampling module within a preset time period;
when the bus voltage value is smaller than a desired value, the discharge execution module continuously controls the high-voltage capacitor to discharge the redundant electric quantity;
when the bus voltage value is larger than a desired value, the abnormal protection module generates an interrupt signal to the discharge driving module within the discharge duration threshold value so as to reset the driving signal to close the discharge execution module, and the microcontroller issues the discharge signal again after an interval time and repeats the process for n times.
6. An active discharge method of a motor controller, comprising the steps of:
configuring an active discharge circuit comprising: a low voltage battery source; an isolated power supply electrically connected to the low voltage battery source; the signal isolation module is electrically connected with the isolation power supply and is externally connected with a microcontroller; the time delay discharge module is electrically connected with the isolation power supply and the signal isolation module; the discharge driving module is electrically connected with the time delay discharge module; the abnormal protection module is electrically connected with the emergency power supply, the isolation power supply and the discharge driving module; the high-voltage capacitor stores redundant electric quantity and is electrically connected with the emergency power supply and the abnormal protection module; the discharge execution module is electrically connected with the discharge driving module and the high-voltage capacitor;
when the primary power supply of the microcontroller and the signal isolation module is abnormally lost, the microcontroller generates a discharge signal to the signal isolation module, or the isolation power supply sends a low-voltage signal to the signal isolation module, the signal isolation module sends a discharge request signal to the time-delay discharge module, the time-delay discharge module generates a discharge time-delay signal to the discharge driving module based on the discharge request signal, and the discharge driving module generates a driving signal to the discharge execution module based on the discharge time-delay signal, so that the discharge execution module discharges redundant electric quantity to the high-voltage capacitor, and the output voltage of the high-voltage capacitor is lower than a voltage threshold.
7. The active discharge method of claim 5,
the emergency power supply and the low-voltage battery source jointly supply power to the isolation power supply, and a second input voltage provided by the low-voltage battery source to the isolation power supply is smaller than a first input voltage provided by the low-voltage battery source to the isolation power supply when the power is not lost; the isolation power supply respectively supplies power to the abnormal protection module, the signal isolation module, the time-delay discharge module and the discharge driving module.
8. The active discharge method of claim 6,
the abnormal protection module monitors the output voltage value of the high-voltage capacitor, a voltage reduction slope circuit is preset in the abnormal protection module, and the voltage reduction slope circuit records the voltage threshold, a slope threshold and a discharge duration threshold;
and generating an interrupt signal to the discharge driving module by the abnormity protection module after the low-voltage battery source loses power to enable the isolation power supply to send a low-voltage signal to the abnormity protection module and after the discharge time length threshold value is reached, and monitoring that the output voltage value is higher than the voltage threshold value by the abnormity protection module so as to reset the driving signal to close the discharge execution module.
9. The active discharge method of claim 7,
when the abnormal protection module monitors that the output voltage falling slope of the high-voltage capacitor is higher than the slope threshold value, so that the output voltage value is lower than the voltage threshold value, the discharge execution module continuously controls the high-voltage capacitor to discharge the surplus electric quantity until the output voltage value is lower than 55V.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117477510A (en) * | 2023-12-26 | 2024-01-30 | 武汉船舶职业技术学院 | Active discharging circuit for electric automobile and hardware protection method |
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2022
- 2022-09-16 CN CN202211129023.3A patent/CN115296591A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117477510A (en) * | 2023-12-26 | 2024-01-30 | 武汉船舶职业技术学院 | Active discharging circuit for electric automobile and hardware protection method |
| CN117477510B (en) * | 2023-12-26 | 2024-03-12 | 武汉船舶职业技术学院 | Active discharging circuit for electric automobile and hardware protection method |
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