Braking energy control circuit and charging robot

Abstract

This invention discloses a braking energy control circuit and a charging robot, belonging to the technical field of mobile charging. The braking energy control circuit of this invention includes an energy storage battery pack, a low-voltage power supply unit, a chassis electric drive system, and a braking energy detection and control unit. The output terminal of the energy storage battery pack is connected to the low-voltage power supply unit, which is connected to the chassis electric drive system. The braking energy detection and control unit is disposed between the low-voltage power supply unit and the chassis electric drive system. The braking energy detection and control unit monitors short-term high voltages fed back from the chassis electric drive system and absorbs the high-voltage energy. According to this invention, when the charging robot brakes or travels down a long slope, the short-term high voltages fed back from the electric drive chassis system are monitored in real time. If the high voltage is within a threshold, the discharge resistor is automatically controlled to absorb the feedback energy, thereby avoiding false protection of the system's low-voltage power supply unit and ensuring the normal operation of the mobile smart charging robot.

Description

[Technical Field]

[0001] (CROSS-REFERENCE TO RELATED APPLICATIONS) This invention claims priority from a Chinese patent invention bearing application number 202222873078.7 and entitled "Braking energy control circuit and charging robot" filed with the China Patent Office on October 28, 2022, the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to the technical field of mobile charging, and more particularly to a braking energy control circuit and a charging robot. [Background technology]

[0003] With the development and popularization of new energy vehicle technology, more and more people are purchasing and using electric vehicles, and the demand for fast charging is rapidly increasing. Under this background and momentum, energy-storage mobile smart charging robots have begun to appear on the market, which are composed of components such as a large-capacity energy storage battery pack, a charging device, and a chassis electric drive system, where the chassis electric drive system shares a low-voltage bus with the system control power supply.

[0004] In terms of usage, it is common to remotely control or automatically drive to a target location for quick and rapid charging, which is extremely convenient for people's charging needs and also provides a very comfortable charging experience.

[0005] However, when such a mobile charging robot brakes or goes down a long slope, a high short-term high voltage is fed back from its chassis motor to the system's low-voltage power supply unit, triggering the overpressure protection function of the low-voltage power supply unit, causing a protective power cut-off in the system's low-voltage power supply unit, and even causing the control system of the entire device to lose low-voltage power and shut down, which seriously affects the normal operation of the energy storage mobile charging device. Summary of the Invention

[0006] In view of the problems in the related art, the present invention proposes a braking energy control circuit and a charging robot, which monitors in real time the short-term high voltage feedback from the electric drive chassis system when the charging robot is braking or going downhill, and automatically controls the discharge resistor to absorb the feedback energy if it is within a threshold, thereby avoiding false protection of the system's low-voltage power supply unit and ensuring the normal operation of the mobile smart charging robot.

[0007] To achieve the above objectives, the present invention proposes the following technical solutions.

[0008] The braking energy control circuit of the present invention comprises an energy storage battery pack, a low-voltage power supply unit, and a chassis electric drive system, and further comprises a braking energy detection and control unit, wherein the output terminal of the energy storage battery pack is connected to the low-voltage power supply unit, and the low-voltage power supply unit is connected to the chassis electric drive system, and the braking energy detection and control unit is disposed between the low-voltage power supply unit and the chassis electric drive system, and the braking energy detection and control unit is for monitoring the short-term high voltage fed back from the chassis electric drive system and absorbing the high-voltage energy.

[0009] In one embodiment, the braking energy detection and control unit includes a voltage detection module VC, a discharge resistor R, and a relay K4. The positive pole of the voltage detection module VC and one end of the relay K4 are both connected to the output terminal of the low-voltage power supply unit, and the other end of the relay K4 is connected to the GND of the output terminal of the low-voltage power supply unit via the discharge resistor R. The negative pole of the voltage detection module VC is connected to the GND of the output terminal of the low-voltage power supply unit, and the voltage detection module VC is connected to the relay K4 via a control signal line.

[0010] The charging robot according to the present invention is equipped with the braking energy control circuit described above.

[0011] According to one embodiment, the system further includes a charging controller, a DC / DC charging module, and a charging gun, wherein the input terminal of the DC / DC charging module is connected to the energy storage battery pack via a relay K1, and the output terminal of the DC / DC charging module is connected to the charging gun via a relay K2, and the charging controller is connected to the energy storage battery pack, the DC / DC charging module, and the charging gun via communication lines.

[0012] In one embodiment, the output terminal of the low-voltage power supply unit is connected to the charging controller and also to the charging gun via a relay K3.

[0013] According to one embodiment, the charge controller is connected to each of relay K1, relay K2, and relay K3 via control signal lines.

[0014] According to one embodiment, the low-voltage power supply unit comprises a power conversion device and a circuit breaker QF, the circuit breaker QF is disposed between the energy storage battery pack and the power conversion device, and the power conversion device converts the high voltage of the energy storage battery pack into a low voltage of 24V.

[0015] According to one embodiment, the chassis electric drive system comprises a motor controller MCU connected to a low voltage power supply unit and a motor M.

[0016] The technical solution proposed in this invention can bring the following beneficial effects compared with the related art:

[0017] (1) The braking energy control circuit of this invention monitors in real time the short-term high voltage fed back from the electric drive chassis system when the charging robot is braking or going downhill, and if it is within a threshold, it can automatically control the discharge resistor to absorb the feedback energy. This effectively solves the problem of the system's low-voltage power supply unit falsely triggering protective power cut-off due to the energy fed back from the motor system being too high when the charging robot is braking or going downhill for a long time, and effectively ensures the stability and reliability of the charging robot's operation.

[0018] (2) The braking energy control circuit of the present invention has a simple circuit structure design, and the cost required for implementation is relatively low, making it highly popular and applicable. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a schematic diagram of a braking energy control circuit of a charging robot according to the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0020] For a better understanding of the present invention, the present application will now be described in detail with reference to the drawings and examples.

[0021] Example 1 1, the braking energy control circuit according to this embodiment includes an energy storage battery pack BAT, a low-voltage power supply unit, a chassis electric drive system, and a braking energy detection and control unit. The energy storage battery pack BAT is composed of a lithium battery energy storage pack and a battery management system BMS.

[0022] The output end of the energy storage battery pack BAT is connected to a low-voltage power supply unit, which is composed of a power conversion device DC / DC and a circuit breaker QF. The circuit breaker QF is arranged between the energy storage battery pack and the power conversion device, which converts the high voltage of the energy storage battery pack to a low voltage of 24V and functions as the system control power supply and the operating power supply for the motor controller MCU. The low-voltage power supply unit is connected to a chassis electric drive system, which includes a motor controller MCU and a motor M and is used to generate a motion effect.

[0023] The braking energy detection and control unit is disposed between the low-voltage power supply unit and the chassis electric drive system, and includes a voltage detection module VC, a discharge resistor R, and a relay K4. The positive pole of the voltage detection module VC and one end of the relay K4 are both connected to the output terminal of the low-voltage power supply unit, and the other end of the relay K4 is connected to the GND of the output terminal of the low-voltage power supply unit via the discharge resistor R. The negative pole of the voltage detection module VC is connected to the GND of the output terminal of the low-voltage power supply unit, and the voltage detection module VC is connected to the relay K4 via a control signal line.

[0024] The voltage detection module VC in the braking energy detection and control unit monitors in real time the short-term high voltage fed back from the chassis electric drive system when braking or going down a long slope. If this feedback voltage threatens the normal operation of the system's low-voltage power supply unit, it will automatically close relay K4 and absorb the high-voltage energy fed back from the chassis electric drive system through discharge resistor R. After the absorption is complete, relay K4 will open normally and the voltage detection module VC will continue to monitor in real time.

[0025] Example 2 The charging robot according to this embodiment includes a charging controller, a DC / DC charging module, a charging gun, and the braking energy control circuit described in embodiment 1. The input terminal of the DC / DC charging module is connected to the energy storage battery pack via relay K1, the output terminal of the DC / DC charging module is connected to the charging gun via relay K2, and the charging controller is connected to the energy storage battery pack, DC / DC charging module, and charging gun via communication lines. The output terminal of the low-voltage power supply unit is connected to the charging controller and also to the charging gun via relay K3. The charging controller is connected to each of relays K1, K2, and K3 via control signal lines.

[0026] When the circuit breaker QF is closed, the DC / DC in the low-voltage power supply unit obtains power and outputs 24V low-voltage power, and the charge controller, motor controller MCU, and voltage detection module VC in the braking energy detection and control unit all obtain power and begin operating. At this point, the charge controller runs a self-test program, and after passing the self-test, the entire device enters standby mode.

[0027] When the smart charging robot is moving to the target position, the voltage detection module VC in the braking energy detection and control unit monitors the feedback voltage from the chassis electric drive system in real time. If this feedback voltage threatens the normal operation of the system's low-voltage power supply unit, it will automatically close relay K4, and the discharge resistor R will absorb the high-voltage energy fed back from the chassis electric drive system. After the absorption is complete, K4 will open normally, and the voltage detection module VC will continue to monitor in real time.

[0028] According to this embodiment, the problem of the system's low-voltage power supply unit erroneously triggering protective power cut-off due to excessively high energy feedback from the motor system caused by braking or long downhill slopes while the smart charging robot is moving is well solved, and the stability and reliability of the system are effectively guaranteed, with low cost and high value for popularization and application.

[0029] Although the present invention and its embodiments have been described in brief above, this description is not limiting, and in addition, what is shown in the drawings is only one embodiment of the present invention, and the actual configuration is not limited thereto. Therefore, as long as it does not deviate from the creative spirit of the present invention, structural forms and embodiments similar to the technical solutions designed by those skilled in the art based on the teachings above and without any creative effort shall both be included in the protection scope of the present invention.

Claims

1. A braking energy control circuit comprising an energy storage battery pack, a low voltage power supply unit, and a chassis electric drive system, Further comprising a braking energy detection and control unit; an output end of the energy storage battery pack is connected to the low-voltage power supply unit, and the low-voltage power supply unit is connected to the chassis electric drive system; the braking energy detection and control unit is disposed between the low-voltage power supply unit and the chassis electric drive system, and the braking energy detection and control unit is for monitoring short-term high voltage fed back from the chassis electric drive system and absorbing high-voltage energy; Braking energy control circuit.

2. The braking energy detection and control unit comprises a voltage detection module VC, a discharge resistor R and a relay K4; The positive electrode of the voltage detection module VC and one end of the relay K4 are both connected to the output end of the low-voltage power supply unit, the other end of the relay K4 is connected to the GND of the output end of the low-voltage power supply unit via the discharge resistor R, the negative electrode of the voltage detection module VC is connected to the GND of the output end of the low-voltage power supply unit, and the voltage detection module VC is connected to the relay K4 via a control signal line.

2. The braking energy control circuit of claim 1.

3. A braking energy control circuit according to claim 1 or 2, Charging robot.

4. The device further includes a charge controller, a DC / DC charging module, and a charging gun; The input terminal of the DC / DC charging module is connected to the energy storage battery pack via a relay K1, the output terminal of the DC / DC charging module is connected to the charging gun via a relay K2, and the charging controller is connected to the energy storage battery pack, the DC / DC charging module, and the charging gun via communication lines. The charging robot according to claim 3 .

5. The output terminal of the low-voltage power supply unit is connected to the charging controller and also to the charging gun via a relay K3. The charging robot according to claim 4.

6. The charge controller is connected to each of the relays K1, K2, and K3 via control signal lines. The charging robot according to claim 5 .

7. The low-voltage power supply unit includes a power conversion device and a circuit breaker QF, The circuit breaker QF is disposed between the energy storage battery pack and the power conversion device, and the power conversion device converts the high voltage of the energy storage battery pack into a low voltage of 24 V. The charging robot according to claim 6.

8. The chassis electric drive system includes a motor controller MCU connected to the low-voltage power supply unit and a motor M. The charging robot according to claim 7.

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