CN211958860U - Electric power steering power supply switching device - Google Patents
Electric power steering power supply switching device Download PDFInfo
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- CN211958860U CN211958860U CN202020979100.4U CN202020979100U CN211958860U CN 211958860 U CN211958860 U CN 211958860U CN 202020979100 U CN202020979100 U CN 202020979100U CN 211958860 U CN211958860 U CN 211958860U
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Abstract
The utility model relates to an electric power steering power technical field especially relates to an electric power steering power switching device. In the electric power steering power supply switching device, a high-voltage storage battery, a boosting DC-DC power supply module, a voltage-reducing DC-DC power supply module, a low-voltage lead-acid battery, a steering controller and an oil pump steering motor are arranged. The power supply switching device forms two power supply paths through connection among the devices, and can realize seamless switching of power supply to the steering controller from the first power supply path to the second power supply path when the high-voltage power supply is in an abnormal state, thereby avoiding the risk of power-assisted steering blockage or interruption and ensuring the driving safety.
Description
Technical Field
The utility model relates to an electric power steering power technical field especially relates to an electric power steering power switching device.
Background
With the continuous emergence and the propulsion of new forms of energy electric motor cars, the safety requirement on electric motor cars is also higher and higher, and electric power steering is a part of electric motor car standard and joins in marriage, and the safety requirement is extremely high. Under the normal condition, electric automobile's electric power steering controller adopts the power supply of high voltage battery to control steering oil pump motor work, lead to under the condition of the unusual disconnection of high pressure suddenly when high voltage battery or other equipment are unusual, electric power steering controller will unable work, and the steering wheel does not have the helping hand, and this will seriously influence driving safety.
In order to solve the above problems, a conventional technology is to use a dual-winding power-assisted steering motor to realize the switching of electric power-assisted steering, the dual-winding power-assisted steering motor has two steering controllers, the two controllers are respectively powered by a vehicle-mounted high-voltage battery and a vehicle-mounted low-voltage battery, the two steering controllers respectively control two windings of the dual-winding power-assisted motor, the dual-winding is composed of a high-voltage winding and a low-voltage winding, and a motor rotor is shared. Under normal conditions, a high-voltage power supply is used for supplying power, the high-voltage controller drives the high-voltage winding to work, and under the condition that the high-voltage non-human factor is abnormally disconnected, the low-voltage controller can intervene in the work to ensure that the power-assisted steering system continues to work. This solution has the disadvantage that, due to the two controllers, there is a time interval during the switching, which risks jamming of the power steering.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model aims to solve the technical problem that an electric power steering power supply switching device capable of automatically switching power supplies when a high-voltage power supply abnormal state is provided, the risk of power steering blockage or interruption is avoided, and the safety of driving is ensured.
In order to solve the technical problem, the utility model discloses a technical scheme be:
an electric power steering power supply switching device comprises a high-voltage storage battery, a boosting DC-DC power supply module, a voltage-reducing DC-DC power supply module, a low-voltage lead-acid battery, a steering controller and an oil pump steering motor;
the positive electrode of the high-voltage storage battery is electrically connected with the positive electrode of the steering controller and used as a first power supply path to supply power to the steering controller;
the positive electrode of the high-voltage storage battery is electrically connected with the input end of the voltage-reducing DC-DC power supply module, the output end of the voltage-reducing DC-DC power supply module is electrically connected with the input end of the low-voltage lead-acid battery, and the output end of the low-voltage lead-acid battery is electrically connected with the input end of the voltage-boosting DC-DC power supply module; the positive electrode of the boosting DC-DC power supply module is electrically connected with the positive electrode of the steering controller and is used as a second power supply path for supplying power to the steering controller;
the steering controller is electrically connected with the steering motor of the oil pump;
when the output voltage of the high-voltage storage battery is 0V, the original first power supply path is switched into a second power supply path to supply power for the steering controller.
The high-voltage battery further comprises a first diode and a second diode, wherein the anode of the high-voltage battery is electrically connected with the anode of the first diode, and the cathode of the first diode is electrically connected with the anode of the steering controller; the anode of the boosting DC-DC power supply module is electrically connected with the anode of a second diode, and the cathode of the second diode is electrically connected with the anode of the steering controller;
when the first power supply path supplies power to the steering controller, the voltage value of the cathode of the first diode is larger than that of the anode of the second diode; when the steering controller is powered by the second power supply path, the voltage value of the cathode of the first diode is smaller than that of the anode of the second diode.
Further, the output voltage of the high-voltage storage battery is 500V, and the output voltage of the boosting DC-DC power supply module is 300V.
Furthermore, the high-voltage battery charging system further comprises a pre-charging contactor and a pre-charging resistor, wherein the positive electrode of the high-voltage battery is electrically connected with one end of the pre-charging contactor and one end of the pre-charging resistor respectively, and the other end of the pre-charging contactor and the other end of the pre-charging resistor are electrically connected with the positive electrode of the first diode respectively.
Further, the fuse protector further comprises a first fuse, a second fuse and a third fuse;
the first fuse is arranged between the other end of the pre-charging contactor and the anode of the first diode;
the second fuse is arranged between the anode of the boosting DC-DC power supply module and the anode of the second diode;
the third fuse is arranged between the other end of the pre-charging contactor and the input end of the step-down DC-DC power supply module.
Further, the output voltage of the low-voltage lead-acid battery is 24V.
The beneficial effects of the utility model reside in that: the power supply switching device is provided with two power supply paths to supply power to the steering controller, and the steering controller is supplied with power by a first power supply path under the normal condition of high-voltage power supply; when the high-voltage power supply of the first power supply path is abnormal, under the action of the boost DC-DC power supply module and the diode, the steering controller can be immediately switched to be supplied with power by the second power supply path, the seamless switching of the power supply of the steering controller is ensured, the risk of power-assisted steering blocking or interruption is avoided, and the driving safety is ensured.
Drawings
Fig. 1 is a circuit connection diagram of an electric power steering power switching device according to the present invention;
description of reference numerals:
1. a high-voltage battery; 2. a boost DC-DC power module; 3. a step-down DC-DC power module; 4. a low voltage lead acid battery; 5. a steering controller; 6. an oil pump steering motor; 7. a first diode; 8. a second diode; 9. pre-charging a contactor; 10. pre-charging a resistor; 11. a first fuse; 12. a second fuse 13, a third fuse.
Detailed Description
In order to explain the technical content, the objects and the effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
Referring to fig. 1, the utility model provides an electric power steering power switching device, including high voltage battery 1, step up DC-DC power module 2, step down DC-DC power module 3, low pressure lead acid battery 4, steering controller 5 and oil pump steering motor 6.
The positive electrode of the high-voltage storage battery is electrically connected with the positive electrode of the steering controller and used as a first power supply path to supply power to the steering controller;
the positive electrode of the high-voltage storage battery is electrically connected with the input end of the voltage-reducing DC-DC power supply module, the output end of the voltage-reducing DC-DC power supply module is electrically connected with the input end of the low-voltage lead-acid battery, and the output end of the low-voltage lead-acid battery is electrically connected with the input end of the voltage-boosting DC-DC power supply module; the positive electrode of the boosting DC-DC power supply module is electrically connected with the positive electrode of the steering controller and is used as a second power supply path for supplying power to the steering controller;
the steering controller is electrically connected with the steering motor of the oil pump;
when the output voltage of the high-voltage storage battery is 0V, the original first power supply path is switched into a second power supply path to supply power for the steering controller.
From the above description, the beneficial effects of the present invention are: besides high-voltage power supply is provided for the steering controller through the high-voltage storage battery, the boosting DC-DC power supply module is introduced to serve as a second power supply source to supply power for the steering controller, when the output voltage of the high-voltage storage battery is abnormal, the first power supply path can be switched into the second power supply path to supply power for the steering controller, and the risk of power failure of the steering controller is avoided. The input end of the low-voltage lead-acid battery can continuously obtain power from the high-voltage storage battery through the action of the voltage reduction DC-DC power module, and the smoothness and sufficiency of power supply of the switched second power supply path are guaranteed.
The steering control system further comprises a first diode 7 and a second diode 8, wherein the anode of the high-voltage storage battery is electrically connected with the anode of the first diode, and the cathode of the first diode is electrically connected with the anode of the steering controller; and the anode of the boosting DC-DC power supply module is electrically connected with the anode of a second diode, and the cathode of the second diode is electrically connected with the anode of the steering controller.
When the first power supply path supplies power to the steering controller, the voltage value of the cathode of the first diode is larger than that of the anode of the second diode; when the steering controller is powered by the second power supply path, the voltage value of the cathode of the first diode is smaller than that of the anode of the second diode.
As can be seen from the above description, when the high-voltage power transmission of the first power supply path is abnormally disconnected, the output voltage on the first power supply path is smaller than the output voltage on the second power supply path, and vice versa. At this time, the voltage value of the input of the first diode connected to the first power supply path is smaller than the input voltage of the second diode connected to the second power supply path. According to the unidirectional conduction performance of the diodes, once the output voltage of the first diode is smaller than that of the second diode, the second diode can be immediately conducted to realize power supply switching.
Further, the output voltage of the high-voltage storage battery is 500V, and the output voltage of the boosting DC-DC power supply module is 300V.
From the above description, the output voltage of the high-voltage storage battery under the condition of normal power transmission is 500V, and after the power transmission of the high-voltage storage battery is abnormally disconnected, the 24V low voltage output by the low-voltage lead-acid battery can be boosted to the 300V high voltage through the conversion of the boosting DC-DC power supply module, so that the emergency high-voltage power supply is provided for the steering controller.
Further, the high-voltage battery charging system further comprises a pre-charging contactor 9 and a pre-charging resistor 10, wherein the positive electrode of the high-voltage battery is electrically connected with one end of the pre-charging contactor and one end of the pre-charging resistor respectively, and the other end of the pre-charging contactor and the other end of the pre-charging resistor are electrically connected with the positive electrode of the first diode respectively.
As can be seen from the above description, the pre-charging contactor and the pre-charging resistor form a pre-charging loop, and since the steering controller and the step-down DC-DC power supply module have an input filter capacitor, pre-charging is required to prevent the high voltage released by the high-voltage battery from directly connecting to the filter capacitor, at this time, due to the higher voltage, the voltage on the capacitor C is close to 0, which is likely to cause an instantaneous short circuit, and the pre-charging contactor as a controllable switch can be turned on and off at the beginning and the end of pre-charging, respectively.
Further, a first fuse 11, a second fuse 12, and a third fuse 13 are included; the first fuse is arranged between the other end of the pre-charging contactor and the anode of the first diode; the second fuse is arranged between the anode of the boosting DC-DC power supply module and the anode of the second diode; the third fuse is arranged between the other end of the pre-charging contactor and the input end of the step-down DC-DC power supply module.
As can be seen from the above description, the first fuse, the second fuse, and the third fuse are provided to prevent the devices in the circuit from being damaged by the increased large current when the high-voltage circuit fails or is abnormal, and to protect the safe operation of the circuit.
Further, the output voltage of the low-voltage lead-acid battery is 24V.
From the above description, the low-voltage lead-acid battery has a mature process, low cost and easy maintenance and replacement, and can be better matched with the boost DC-DC power module as a low-voltage output power supply.
Referring to fig. 1, a first embodiment of the present invention is:
an electric power steering power supply switching device comprises a high-voltage storage battery, a boosting DC-DC power supply module, a voltage-reducing DC-DC power supply module, a low-voltage lead-acid battery, a steering controller and an oil pump steering motor.
The high-voltage storage battery can be a lithium battery, a nickel-metal hydride battery, a fuel battery, a lead-acid battery and other high-voltage storage batteries. Under the condition that the high-voltage storage battery supplies power normally, the voltage output by the high-voltage storage battery is 500V, the output voltage is respectively output to two loops through a closed pre-charging switch, and one loop is electrically connected with the anode of the steering controller through the anode end of the high-voltage storage battery to be used as a first power supply path for supplying power to the steering controller; the other path is connected to the voltage-reducing DC-DC power supply module, specifically, the positive electrode of the high-voltage storage battery is electrically connected with the input end of the voltage-reducing DC-DC power supply module, the output end of the voltage-reducing DC-DC power supply module is electrically connected with the input end of the low-voltage lead-acid battery, high voltage electricity output by the high-voltage storage battery is conveyed to the low-voltage lead-acid battery through the voltage-reducing DC-DC power supply module in a voltage-reducing mode, and the low-voltage lead-acid.
Under the condition that the high-voltage storage battery supplies power abnormally, the voltage output by the high-voltage storage battery is 0V, at this time, the power supply of the first power supply path to the steering controller is interrupted, and the first power supply path is converted into a boosting DC-DC power supply module to supply power to the steering controller. The input end of the boosting DC-DC power supply module is connected with the output end of the low-voltage lead-acid battery, 24V low-voltage electricity output by the low-voltage lead-acid battery is boosted to 300V, and at the moment, the anode of the boosting DC-DC power supply module is electrically connected with the anode of the steering controller and outputs 300V voltage to supply power to the steering controller through the second power supply path. Therefore, the electric power steering power switching device in the embodiment can immediately switch the first power supply path to the second power supply path when the output voltage of the high-voltage storage battery is abnormal, so that the boost DC-DC power module supplies power to the steering controller, and the risk of power failure of the steering controller is avoided. And the input end of the low-voltage lead-acid battery can be charged by the voltage-reducing DC-DC power supply module to continuously obtain power from the high-voltage storage battery, so that smooth and sufficient power supply of the switched second power supply path is ensured.
In this embodiment, because the steering controller is connected with the oil pump steering motor, the steering controller can continuously input a power supply, and then can continuously output the UVW three-phase alternating current to the oil pump steering motor, and the oil pump steering motor can keep the power steering system continuously working after being supplied with power.
In the embodiment, a first diode D1 and a second diode D2 are further included, and the first power supply path is mainly formed by electrically connecting the anode of the high-voltage storage battery and the anode of the first diode, and electrically connecting the cathode of the first diode and the anode of the steering controller; the second power supply path is mainly formed by electrically connecting the anode of the boosting DC-DC power supply module with the anode of a second diode, and electrically connecting the cathode of the second diode with the anode of the steering controller. When the first power supply path supplies power to the steering controller, the first power supply path outputs 500V of voltage and conducts the voltage through the diode to input the voltage to the steering controller, at the moment, the second power supply path continuously outputs 300V of voltage through the boosting of the boosting DC-DC power supply module, and as the output voltage on the second power supply path is smaller than the voltage output on the first power supply path, the second diode on the second power supply path is in a non-conducting state, and the second power supply path cannot supply power to the steering controller. However, when the high-voltage storage battery is abnormally supplied with power, the voltage output by the first power supply path is 0V and is less than the voltage of 300V output by the second power supply path, and the second diode is immediately conducted and switched to supply power for the steering controller by the second power supply path. Because the boosting DC-DC power supply module continuously outputs voltage to be matched with the conduction action of the second diode, once the first power supply path is abnormal, the second power supply path can be switched to supply power for the steering controller, the switching process has no switching time interval, the risk of power-assisted steering blocking or interruption is avoided, and the driving safety is ensured.
In this embodiment, the pre-charging contactor S1 and the pre-charging resistor R1 are further included, and the pre-charging contactor and the pre-charging resistor form a pre-charging circuit. Specifically, the positive electrode of the high-voltage storage battery is electrically connected with one end of the pre-charging contactor and one end of the pre-charging resistor respectively, and the other end of the pre-charging contactor and the other end of the pre-charging resistor are electrically connected with the positive electrode of the first diode respectively. Because the steering controller and the voltage reduction DC/DC power supply module are provided with input filter capacitors, the high-voltage storage battery needs to be pre-charged first, so that the situation that the filter capacitors are short-circuited instantly as the high-voltage electricity released by the high-voltage storage battery is directly connected with the filter capacitors is prevented. And the pre-charging contactor can be used as a controllable switch to control the beginning and the end of pre-charging.
In the present embodiment, a first fuse F1, a second fuse F2, and a third fuse F3 are further included; specifically, the first fuse is arranged between the other end of the pre-charging contactor and the anode of the first diode; the second fuse is arranged between the anode of the boosting DC-DC power supply module and the anode of the second diode; the third fuse is arranged between the other end of the pre-charging contactor and the input end of the step-down DC-DC power supply module. The fuse is arranged in each loop, so that when a high-voltage circuit breaks down or is abnormal, the devices in the circuit can be prevented from being damaged by the increased large current, and the safe operation of the circuit is protected.
To sum up, the utility model provides a pair of electric power steering power switching device through setting up two way supply path, provides one kind when high-pressure power supply abnormal state, can realize seamless switching to the power supply of steering controller to the power switching device of second supply path from first supply path.
The above mentioned is only the embodiment of the present invention, and not the limitation of the patent scope of the present invention, all the equivalent transformations made by the contents of the specification and the drawings, or the direct or indirect application in the related technical field, are included in the patent protection scope of the present invention.
Claims (6)
1. The utility model provides an electric power assisted steering power switching device which characterized in that: the device comprises a high-voltage storage battery, a boosting DC-DC power module, a voltage-reducing DC-DC power module, a low-voltage lead-acid battery, a steering controller and an oil pump steering motor;
the positive electrode of the high-voltage storage battery is electrically connected with the positive electrode of the steering controller and used as a first power supply path to supply power to the steering controller;
the positive electrode of the high-voltage storage battery is electrically connected with the input end of the voltage-reducing DC-DC power supply module, the output end of the voltage-reducing DC-DC power supply module is electrically connected with the input end of the low-voltage lead-acid battery, and the output end of the low-voltage lead-acid battery is electrically connected with the input end of the voltage-boosting DC-DC power supply module; the positive electrode of the boosting DC-DC power supply module is electrically connected with the positive electrode of the steering controller and is used as a second power supply path for supplying power to the steering controller;
the steering controller is electrically connected with the steering motor of the oil pump;
when the output voltage of the high-voltage storage battery is 0V, the original first power supply path is switched into a second power supply path to supply power for the steering controller.
2. The electric power steering power switching apparatus according to claim 1, wherein: the high-voltage battery further comprises a first diode and a second diode, wherein the anode of the high-voltage battery is electrically connected with the anode of the first diode, and the cathode of the first diode is electrically connected with the anode of the steering controller; the anode of the boosting DC-DC power supply module is electrically connected with the anode of a second diode, and the cathode of the second diode is electrically connected with the anode of the steering controller;
when the first power supply path supplies power to the steering controller, the voltage value of the cathode of the first diode is larger than that of the anode of the second diode; when the steering controller is powered by the second power supply path, the voltage value of the cathode of the first diode is smaller than that of the anode of the second diode.
3. The electric power steering power switching apparatus according to claim 2, wherein: the output voltage of the high-voltage storage battery is 500V, and the output voltage of the boosting DC-DC power supply module is 300V.
4. The electric power steering power switching apparatus according to claim 2, wherein: the high-voltage battery charging system is characterized by further comprising a pre-charging contactor and a pre-charging resistor, wherein the positive electrode of the high-voltage battery is electrically connected with one end of the pre-charging contactor and one end of the pre-charging resistor respectively, and the other end of the pre-charging contactor and the other end of the pre-charging resistor are electrically connected with the positive electrode of the first diode respectively.
5. The electric power steering power switching apparatus according to claim 4, wherein: the fuse protector further comprises a first fuse, a second fuse and a third fuse;
the first fuse is arranged between the other end of the pre-charging contactor and the anode of the first diode;
the second fuse is arranged between the anode of the boosting DC-DC power supply module and the anode of the second diode;
the third fuse is arranged between the other end of the pre-charging contactor and the input end of the step-down DC-DC power supply module.
6. The electric power steering power switching apparatus according to claim 2, wherein: the output voltage of the low-voltage lead-acid battery is 24V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020979100.4U CN211958860U (en) | 2020-06-02 | 2020-06-02 | Electric power steering power supply switching device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020979100.4U CN211958860U (en) | 2020-06-02 | 2020-06-02 | Electric power steering power supply switching device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211958860U true CN211958860U (en) | 2020-11-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020979100.4U Active CN211958860U (en) | 2020-06-02 | 2020-06-02 | Electric power steering power supply switching device |
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|---|---|
| CN (1) | CN211958860U (en) |
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2020
- 2020-06-02 CN CN202020979100.4U patent/CN211958860U/en active Active
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