CN215601086U - Motor controller stand-by power supply system and electric automobile - Google Patents
Motor controller stand-by power supply system and electric automobile Download PDFInfo
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- CN215601086U CN215601086U CN202121317209.2U CN202121317209U CN215601086U CN 215601086 U CN215601086 U CN 215601086U CN 202121317209 U CN202121317209 U CN 202121317209U CN 215601086 U CN215601086 U CN 215601086U
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Abstract
The utility model discloses a standby power supply system of a motor controller and an electric automobile, wherein the power supply system comprises a low-voltage battery, a low-voltage DC/DC power supply circuit, a first voltage monitoring circuit, a high-voltage battery, a flyback power supply circuit and an automatic switching circuit; one end of the low-voltage DC/DC power circuit is connected with the output end of the low-voltage battery, the other end of the low-voltage DC/DC power circuit is connected with the motor controller, one end of the flyback power circuit is connected with the output end of the high-voltage battery, the other end of the flyback power circuit is connected with the automatic switching circuit, and the automatic switching circuit is connected with the motor controller. According to the technical scheme, on the basis of conventional monitoring of the voltage value of the low-voltage battery, the monitoring circuit for the low-voltage DC/DC power supply is added, and the motor controller can be switched to the standby power supply to work timely and reliably when any low-voltage power supply system is abnormal.
Description
Technical Field
The utility model belongs to the technical field of power supply design of a motor controller, and particularly relates to a standby power supply system of the motor controller and an electric automobile.
Background
In the field of electric automobiles, a motor controller is used as a core component of the power of the whole automobile, the safe and reliable operation of the motor controller is important for the whole automobile, the low-voltage power supply of the motor controller is mostly implemented by using a whole automobile low-voltage battery and a voltage DC/DC power supply as power supply input, and at present, based on the consideration of the driving safety of the whole automobile, the motor controller also needs other standby power supplies to supply power to a low-voltage system in the controller. Because the system of the whole vehicle is relatively complex, the standby power supply cannot achieve hundreds of percent of safety and reliability, and the motor and the controller occupy important positions on the whole vehicle, the market puts higher requirements on the standby power supply system.
However, the current standby power supply system of many motor controllers cannot be switched timely and reliably, and has a single function, and the standby power supply system is only used as a low-voltage standby and does not develop a function in the aspect of more system safety based on the standby power supply.
SUMMERY OF THE UTILITY MODEL
In view of the above problems, the present invention discloses a motor controller backup power supply system and an electric vehicle to overcome the above problems or at least partially solve the above problems.
In order to achieve the purpose, the utility model adopts the following technical scheme:
the utility model provides a power supply system of a standby power supply of a motor controller, which comprises: the device comprises a low-voltage battery, a low-voltage DC/DC power supply circuit, a first voltage monitoring circuit, a high-voltage battery, a flyback power supply circuit and an automatic switching circuit; one end of the low-voltage DC/DC power supply circuit is connected with the output end of the low-voltage battery, the other end of the low-voltage DC/DC power supply circuit is connected with the motor controller, one end of the flyback power supply circuit is connected with the output end of the high-voltage battery, the other end of the flyback power supply circuit is connected with the automatic switching circuit, and the automatic switching circuit is connected with the motor controller; wherein,
the low-voltage DC/DC power supply circuit is used for converting the output voltage of the low-voltage battery into the voltage for driving the motor controller to work;
the flyback power supply circuit is used for converting the output voltage of the high-voltage battery into a voltage capable of driving the motor controller to work;
the first voltage monitoring circuit is used for monitoring the output voltages of the low-voltage battery and the low-voltage DC/DC power supply circuit;
the automatic switching circuit is used for switching to the flyback power supply circuit to supply power to the motor controller when the output voltage monitored by the first voltage monitoring circuit does not meet the requirement.
Optionally, when the first voltage monitoring circuit monitors that any one of the output voltage of the low-voltage battery and the output voltage of the low-voltage DC/DC power supply circuit is lower than a set threshold, the automatic switching circuit switches to the flyback power supply circuit to supply power to the motor controller.
Optionally, the power supply system further includes a switching state monitoring circuit for monitoring a state of the automatic switching circuit.
Optionally, the power supply system further includes a second voltage monitoring circuit, configured to monitor an output voltage of the flyback power supply circuit.
Optionally, the first voltage monitoring circuit, the second voltage monitoring circuit and the switching state monitoring circuit are connected to a microprocessor.
Optionally, the microprocessor is configured to limit a maximum rotation speed of the motor according to an operating state of the automatic switching circuit.
Optionally, the microprocessor is further configured to control a back electromotive force generated during towing not to exceed a direct-current withstand voltage value, so that overvoltage damage of a power device and a capacitor in the motor controller is avoided, and safe towing is achieved.
Optionally, the microprocessor is further configured to short circuit a three-phase circuit in the motor, so as to provide braking torque while preventing current overshoot from damaging the high-voltage battery during downhill driving.
Optionally, the flyback power supply circuit is a flyback switching power supply circuit.
In another aspect, the utility model provides an electric vehicle, wherein the electric vehicle adopts the power supply system.
The utility model has the advantages and beneficial effects that:
according to the technical scheme, the motor controller standby power supply system increases the detection of the output voltage of the low-voltage DC/DC power supply on the basis of conventional monitoring of the voltage value of the low-voltage battery, and ensures that the motor controller can be switched to the standby power supply to work timely and reliably when any low-voltage power supply system is abnormal.
In addition, the improved standby power supply system of the motor controller can help the whole vehicle to realize free trailer and two important safety-related functions of downhill safety.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic structural diagram of a power supply system of a motor controller standby power supply in an embodiment of the utility model.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail and fully with reference to the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the utility model, and not restrictive of the full scope of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is to be understood that the terms "comprises/comprising," "consisting of … …," or any other variation, are intended to cover a non-exclusive inclusion, such that a product, device, process, or method that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such product, device, process, or method if desired. Without further limitation, an element defined by the phrases "comprising/including … …," "consisting of … …," or "comprising" does not exclude the presence of other like elements in a product, device, process, or method that comprises the element.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The technical solutions provided by the embodiments of the present invention are described in detail below with reference to the accompanying drawings.
According to fig. 1, the utility model provides a power supply system of a motor controller standby power supply, comprising: the low-voltage DC/DC power supply circuit comprises a low-voltage battery, a low-voltage DC/DC power supply circuit, a first voltage monitoring circuit, a high-voltage battery, a flyback power supply circuit and an automatic switching circuit.
The low-voltage battery and the high-voltage battery are a low-voltage control power distribution battery and a high-voltage driving battery in the electric vehicle, an example of the automatic switching circuit can be disclosed in chinese patent document CN207853559U, and the flyback power circuit is a high-voltage to low-voltage circuit.
As shown in fig. 1, one end of the low-voltage DC/DC power circuit is connected to the output end of the low-voltage battery, the other end of the low-voltage DC/DC power circuit is connected to the motor controller (or a low-voltage system of the motor controller), one end of the flyback power circuit is connected to the output end of the high-voltage battery, the other end of the flyback power circuit is connected to the automatic switching circuit, and the automatic switching circuit is connected to the motor controller (or the low-voltage system of the motor controller).
And the low-voltage DC/DC power supply circuit is used for converting the output voltage of the low-voltage battery into the voltage for driving the motor controller to work.
And the flyback power supply circuit is used for converting the output voltage of the high-voltage battery into a voltage capable of driving the motor controller to work.
The first voltage monitoring circuit is used for monitoring the output voltages of the low-voltage battery and the low-voltage DC/DC power supply circuit.
The automatic switching circuit is used for switching the power supply circuit to a state that the flyback power supply circuit supplies power to the motor controller when the output voltage monitored by the first voltage monitoring circuit does not meet the requirement and is lower than a preset threshold value.
Therefore, the power supply system monitors the voltage of the low-voltage battery and the output voltage of the low-voltage DC/DC power supply, when one of the 2 voltages is lower than a set voltage threshold value, the automatic switching circuit switches to the flyback power supply for converting high voltage into low voltage to supply power, and the automatic switching circuit adopts hardware switching, so that timely, effective and smooth switching can be realized, and the motor controller can work more reliably and effectively.
In a specific embodiment, when the first voltage monitoring circuit monitors that the output voltage of any one of the low-voltage battery and the low-voltage DC/DC power supply circuit is lower than a set threshold (two different preset thresholds), the automatic switching circuit switches to the flyback power supply circuit to supply power to the motor controller.
In one or some embodiments, the power supply system further comprises a switching state monitoring circuit for monitoring the state of the automatic switching circuit and transmitting the state to the complete machine microprocessor.
In one or some embodiments, the power supply system further comprises a second voltage monitoring circuit for monitoring the output voltage of the flyback power supply circuit.
And the first voltage monitoring circuit, the second voltage monitoring circuit and the switching state monitoring circuit are connected with a microprocessor of the whole machine, so that the microprocessor can be used for monitoring the voltage in real time and realizing corresponding adjustment.
In one embodiment, the microprocessor is used for limiting the maximum rotating speed of the motor according to the working state of the automatic switching circuit, so that driving safety is guaranteed, and meanwhile, the effect of reminding a driver is achieved.
In a preferred embodiment, because the motor controller has a complete and reliable standby power supply system, when the trailer is turned off, the controller can realize that the counter potential does not exceed the direct-current withstand voltage value, avoid overvoltage damage of an IGBT (insulated gate bipolar transistor) and a capacitor, and realize safety of the trailer.
In a preferred embodiment, the microprocessor can also realize a hill descending auxiliary function, and according to the complete and reliable standby power supply system, the motor controller can realize self protection under the worst conditions, such as the conditions that the SOC is full, the motor speed is high, and the low-voltage power supply fails, the motor three-phase is in short circuit, the braking torque is provided, and meanwhile, the current overshoot is avoided from damaging the high-voltage battery.
In one embodiment, the flyback power supply circuit is a flyback switching power supply circuit. The flyback switching power supply is designed according to the idea that stable voltage is output, the voltage of an output end is obtained firstly, then the voltage is fed back to a power supply chip to output PWM waves with different duty ratios (the duty ratio is increased when the voltage is low, and is reduced when the voltage is not low), and finally a dynamic balance is achieved, wherein the stable voltage is a result of continuous feedback.
The embodiment of the utility model also discloses an electric automobile comprising the power supply system, and other related structures of the electric automobile can be referred to the existing documents and are not repeated herein.
The above description is only an embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, extension, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.
Claims (10)
1. A motor controller backup power supply system, the power supply system comprising: the device comprises a low-voltage battery, a low-voltage DC/DC power supply circuit, a first voltage monitoring circuit, a high-voltage battery, a flyback power supply circuit and an automatic switching circuit; one end of the low-voltage DC/DC power supply circuit is connected with the output end of the low-voltage battery, the other end of the low-voltage DC/DC power supply circuit is connected with the motor controller, one end of the flyback power supply circuit is connected with the output end of the high-voltage battery, the other end of the flyback power supply circuit is connected with the automatic switching circuit, and the automatic switching circuit is connected with the motor controller; wherein,
the low-voltage DC/DC power supply circuit is used for converting the output voltage of the low-voltage battery into the voltage for driving the motor controller to work;
the flyback power supply circuit is used for converting the output voltage of the high-voltage battery into a voltage capable of driving the motor controller to work;
the first voltage monitoring circuit is used for monitoring the output voltages of the low-voltage battery and the low-voltage DC/DC power supply circuit;
the automatic switching circuit is used for switching to the flyback power supply circuit to supply power to the motor controller when the output voltage monitored by the first voltage monitoring circuit does not meet the requirement.
2. The power supply system according to claim 1, wherein when the first voltage monitoring circuit monitors that the output voltage of either one of the low-voltage battery and the low-voltage DC/DC power supply circuit is lower than a set threshold value, the automatic switching circuit switches to the flyback power supply circuit to supply power to the motor controller.
3. The power supply system of claim 2, further comprising a switching state monitoring circuit for monitoring a state of the automatic switching circuit.
4. The power supply system of claim 3, further comprising a second voltage monitoring circuit for monitoring the output voltage of the flyback power supply circuit.
5. The power supply system of claim 4, wherein the first voltage monitoring circuit, the second voltage monitoring circuit, and the switching state monitoring circuit are connected to a microprocessor.
6. The power supply system of claim 5, wherein the microprocessor is configured to limit a maximum rotational speed of the motor based on an operating state of the automatic switching circuit.
7. The power supply system of claim 5, wherein the microprocessor is further configured to control a back electromotive force generated during towing not to exceed a DC withstand voltage value, so as to avoid overvoltage damage of power devices and capacitors in the motor controller and realize safe towing.
8. The power supply system of claim 5 wherein said microprocessor is further configured to short circuit a three phase circuit within the motor to provide braking torque while on a downhill grade to avoid current overshoot that could damage said high voltage battery.
9. The power supply system of claim 1, wherein the flyback power supply circuit is a flyback switching power supply circuit.
10. An electric vehicle, characterized in that the electric vehicle employs the power supply system according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121317209.2U CN215601086U (en) | 2021-06-11 | 2021-06-11 | Motor controller stand-by power supply system and electric automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121317209.2U CN215601086U (en) | 2021-06-11 | 2021-06-11 | Motor controller stand-by power supply system and electric automobile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215601086U true CN215601086U (en) | 2022-01-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121317209.2U Active CN215601086U (en) | 2021-06-11 | 2021-06-11 | Motor controller stand-by power supply system and electric automobile |
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| CN (1) | CN215601086U (en) |
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2021
- 2021-06-11 CN CN202121317209.2U patent/CN215601086U/en active Active
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