Power conversion system with power recovery control function and control method thereof

Abstract

The invention belongs to the technical field of electric energy conversion systems, and discloses an electric power conversion system with an electric power recovery control function and a control method thereof.The electric power conversion system comprises a central controller, a brake detection system, a brake system, a selection assembly, a brake energy control assembly and an electric power recovery assembly; the central controller is connected with the brake detection system and the selection assembly, the brake detection system is connected with the brake system and the selection assembly, and the selection assembly is connected with the brake energy control assembly and the electric power recovery assembly. By means of the mode, automatic intervention is achieved when the vehicle braking system is overheated or the braking system is in an off-line fault, and therefore the driving safety of the vehicle is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric energy conversion systems, and in particular to an electric power conversion system with an electric power recovery control function and a control method thereof. Background Art

[0002] Braking energy recovery is a commonly used technology in current new energy vehicles. Users can control the opening and closing of vehicle kinetic energy recovery through the control system.

[0003] Among many existing technologies, Chinese patent CN107415702A discloses a braking energy recovery system, a recovery method and a new energy vehicle for a new energy vehicle, which includes a wheel braking system for converting the vehicle's kinetic energy into mechanical energy and a first thermal energy during the wheel braking process; a mechanical energy recovery system for determining the battery's absorbable electrical energy based on the battery's state of charge, determining the convertible electrical energy based on the mechanical energy and the energy conversion efficiency, and when the battery's absorbable electrical energy is greater than or equal to the convertible electrical energy, converting the mechanical energy into charging electrical energy with an energy value equal to the convertible electrical energy.

[0004] However, this patent application cannot achieve automatic intervention when the vehicle's braking system overheats or fails to go offline, thereby improving the vehicle's driving safety.

[0005] Based on this, the present invention designs a power conversion system with power recovery control function and a control method thereof to solve the above problems. Summary of the invention

[0006] In view of the above-mentioned shortcomings of the prior art, the present invention provides a power conversion system with power recovery control function and a control method thereof.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: A power conversion system with a power recovery control function, comprising a central controller, a brake detection system, a brake system, a selection component, a brake energy control component and a power recovery component, wherein the central controller is connected to the brake detection system and the selection component, the brake detection system is connected to the brake system and the selection component, and the selection component is connected to the brake energy control component and the power recovery component; The brake detection system is used to detect the operating temperature of the brake system and whether it is offline and generate a detection signal. The brake detection system sends the detection signal to the central controller, and the brake detection system sends a control signal to the selection component; The central controller is used for the user to input the energy recovery mode and generate a control signal, and the central controller sends the control signal to the selection component. The central controller is also used for analyzing and processing the detection signal; The selection component is used to select according to the control signal and output a brake start signal for controlling the operation of the brake energy control component; The braking energy control component is used to adjust the connection with the power generation end of the power recovery component according to the start signal sent by the selection component; The power recovery component is used to convert the kinetic energy generated by vehicle braking into electrical energy and store it.

[0008] Furthermore, the brake detection system includes a brake system state detection chip, a temperature sensor and a temperature control detection chip, the brake system state detection chip is connected to the central controller, the brake system and the selection component, the temperature sensor is connected to the brake system and the temperature control detection chip, and the temperature control detection chip is connected to the central controller and the selection component; The brake system status detection chip is used to detect whether the brake system is offline. When the brake system status detection chip detects that the brake system is offline, the control port of the brake system status detection chip sends a low-level control signal to the selection component and sends an offline signal to the central controller; When the brake system status detection chip detects that the brake system is not offline, the control port of the brake system status detection chip sends a high-level control signal to the selection component; The temperature sensor is used to detect the operating temperature of the brake system; and send the temperature detection signal to the temperature control detection chip; The temperature control detection chip is used to compare the value of the temperature detection signal with a set threshold value; When the value is less than the threshold, the control interface of the temperature control detection chip outputs a high-level control signal to the selection component; When the value is greater than or equal to the threshold, the control interface of the temperature control detection chip outputs a low-level control signal to the selection component, and the temperature control detection chip sends a brake high temperature warning signal to the central controller.

[0009] Furthermore, the selection component includes a two-way selector 1 and a two-way selector 2, and the two-way selector 1 and the two-way selector 2 are of the same model; The first pin of the two-way selector 1 is electrically connected to the control interface of the temperature control detection chip, the second pin of the two-way selector 1 is electrically connected to the central controller, the C pin of the two-way selector 1 is electrically connected to the control interface of the temperature control detection chip, and the Y pin of the two-way selector 1 is connected to the braking energy control component; The first pin of the two-way selector 2 is electrically connected to the control interface of the brake system state detection chip, the second pin of the two-way selector 2 is electrically connected to the central controller, the C pin of the two-way selector 2 is electrically connected to the control interface of the brake system state detection chip, and the Y pin of the two-way selector 2 is connected to the brake energy control component; The Y pins of the two-way selector 1 and the two-way selector 2 send a start signal to the braking energy control component.

[0010] Furthermore, the braking energy control component includes a braking energy recovery starting module and a braking energy converter, the braking energy recovery starting module has two input ends and is electrically connected to the Y pins of the two-way selector 1 and the two-way selector 2 respectively, the output end of the braking energy recovery starting module is connected to the braking energy converter, the braking energy converter is connected to the power generation end of the power recovery component, and the Y pins of the two-way selector 1 and the two-way selector 2 send a start signal to the braking energy recovery starting module.

[0011] Furthermore, when one of the two input ends or both of the two input ends of the braking energy recovery starting module receive a low-level starting signal, the braking energy recovery starting module controls the braking energy converter to be transmission-connected with the power generation end of the power recovery component.

[0012] Furthermore, the power recovery component includes a three-phase motor, an inverter and a power battery pack, the output end of the three-phase motor is connected to the brake energy converter, the three-phase terminal of the three-phase motor is electrically connected to the input end of the inverter, and the output end of the inverter is electrically connected to the power battery pack.

[0013] Furthermore, it also includes an alarm component, which includes a first alarm module and a second alarm module, and the first alarm module and the second alarm module are both electrically connected to the central controller.

[0014] The first alarm module is used for controlling the central controller to issue a brake offline alarm when the central controller receives an offline signal sent by the brake system status detection chip; The second alarm module is used for controlling the central controller to issue a high-temperature brake alarm when the central controller receives a high-temperature brake warning signal sent by the temperature control detection chip.

[0015] In order to better achieve the purpose of the present invention, the present invention also provides a control method for a power conversion system with a power recovery control function, comprising the following steps: Step 1: The brake system status detection chip detects whether the brake system is offline; Step 2: When the brake system status detection chip detects that the brake system is offline, the control port of the brake system status detection chip sends a low-level control signal to the first pin and the C pin of the two-way selector 2 and sends an offline signal to the central controller; When the C pin of the two-way selector 2 receives a low-level control signal, the output of the first pin of the two-way selector 2 is valid, and the Y pin of the two-way selector 2 outputs a low-level control signal. After the braking energy recovery start module receives the low-level control signal, the braking energy recovery start module controls the braking energy converter to be connected to the output end of the three-phase motor. The AC power generated by the three-phase motor is inverted into DC power through the inverter and stored in the power battery pack; Step 3: After receiving the offline signal, the central controller controls the first alarm module to issue a brake offline alarm; Step 4: When the brake system status detection chip detects that the brake system is not offline, the control port of the brake system status detection chip sends a high-level control signal to the two-way selector 2; When the C pin of the two-way selector 2 receives a high-level control signal, the output of the second pin of the two-way selector 2 is valid, and at this time, the central controller controls the output level start signal of the Y pin of the two-way selector 2; Step 5: The temperature sensor detects the operating temperature of the brake system; and sends the temperature detection signal to the temperature control detection chip, which compares the value of the temperature detection signal with the set threshold value; Step 6: When the value is less than the threshold, the control interface of the temperature control detection chip outputs a high-level control signal to the first pin and the C pin of the two-way selector; Step 7: When the C pin of the two-way selector 1 receives a high-level control signal, the output of the second pin of the two-way selector 1 is valid, and at this time, the central controller controls the output level start signal of the Y pin of the two-way selector 1; Step 8: When the value is greater than or equal to the threshold, the control interface of the temperature control detection chip outputs a low-level control signal to the two-way selector 1, and the temperature control detection chip sends a brake high temperature warning signal to the central controller; Step 9: When the C pin of the two-way selector 1 receives a low-level control signal, the output of the first pin of the two-way selector 1 is valid, and the Y pin of the two-way selector 1 outputs a low-level control signal. After the braking energy recovery start module receives the low-level control signal, the braking energy recovery start module controls the braking energy converter to be connected to the output end of the three-phase motor. The AC power generated by the three-phase motor is inverted into DC power through the inverter and stored in the power battery pack; Step 10: After the central controller receives the brake high temperature warning signal, the central controller controls the second alarm module to issue a brake high temperature alarm.

[0016] The present invention has the following technical effects: When the present invention is used, the operating temperature of the braking system and whether it is offline are detected by the braking detection system. The braking detection system sends a detection signal to the central controller and a control signal to the selection component. The selection component controls the braking energy control component according to the control signal sent by the braking detection system. When the braking energy control component is connected to the power generation end of the power recovery component, the power recovery component generates electricity and converts the kinetic energy of the vehicle into electrical energy for storage. Therefore, when the braking system is at high temperature or fails to go offline, the kinetic energy of the vehicle is converted into electrical energy by connecting the braking energy control component to the power generation end of the power recovery component, thereby slowing down the vehicle, reducing the load on the braking system when the braking system is at high temperature, and actively slowing down through braking energy recovery when the braking system fails to go offline, thereby ensuring the safety of the vehicle.

[0017] When the present invention is used, the off-line alarm and high-temperature alarm of the braking system are realized through the first alarm module and the second alarm module. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 A block diagram of a power conversion system with power recovery control function according to the present invention Figure 1 .

[0020] Figure 2 A block diagram of a power conversion system with power recovery control function according to the present invention Figure 2 .

[0021] The numbers in the figure represent: 1. Central controller 2. Braking detection system 21. Braking system status detection chip 22. Temperature sensor 23. Temperature control detection chip 3. Braking system 4. Selection component 41. Two-way selector one 42. Two-way selector two 5. Braking energy control component 51. Braking energy recovery start module 52. Braking energy converter 6. Power recovery component 61. Three-phase motor 62. Inverter 63. Power battery pack 7. Alarm component 71. First alarm module 72. Second alarm module DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] The present invention will be further described below in conjunction with the embodiments.

[0024] Example 1: Please refer to the attached manual Figure 1-2 , a power conversion system with a power recovery control function, comprising a central controller 1, a brake detection system 2, a brake system 3, a selection component 4, a brake energy control component 5 and a power recovery component 6, wherein the central controller 1 is connected to the brake detection system 2 and the selection component 4, the brake detection system 2 is connected to the brake system 3 and the selection component 4, and the selection component 4 is connected to the brake energy control component 5 and the power recovery component 6; The brake detection system 2 is used to detect the operating temperature of the brake system 3 and whether it is offline and generate a detection signal. The brake detection system 2 sends the detection signal to the central controller 1, and the brake detection system 2 sends a control signal to the selection component 4; The central controller 1 is used for the user to input the energy recovery mode and generate a control signal. The central controller 1 sends the control signal to the selection component 4. The central controller 1 is also used for analyzing and processing the detection signal. The selection component 4 is used to select according to the control signal and output a brake start signal for controlling the operation of the brake energy control component 5; The braking energy control component 5 is used to adjust the connection with the power generation end of the power recovery component 6 according to the start signal sent by the selection component 4; The power recovery component 6 is used to convert the kinetic energy generated by vehicle braking into electrical energy and store it.

[0025] When the present invention is used, the operating temperature and whether the braking system 3 is offline are detected by the braking detection system 2. The braking detection system 2 sends a detection signal to the central controller 1 and a control signal to the selection component 4. The selection component 4 controls the braking energy control component 5 according to the control signal sent by the braking detection system 2. When the braking energy control component 5 is connected to the power generation end of the power recovery component 6, the power recovery component 6 generates electricity and converts the kinetic energy of the vehicle into electrical energy for storage. Therefore, when the braking system 3 is at high temperature or fails offline, the kinetic energy of the vehicle is converted into electrical energy by connecting the braking energy control component 5 to the power generation end of the power recovery component 6, thereby slowing down the vehicle, reducing the load of the braking system 3 when the braking system 3 is at high temperature, and actively slowing down through braking energy recovery when the braking system 3 fails offline, thereby ensuring the safety of the vehicle.

[0026] Example 2: Figure 1-2 As shown, as a preferred embodiment of the present invention, the brake detection system 2 includes a brake system state detection chip 21, a temperature sensor 22 and a temperature control detection chip 23, the brake system state detection chip 21 is connected to the central controller 1, the brake system 3 and the selection component 4, the temperature sensor 22 is connected to the brake system 3 and the temperature control detection chip 23, and the temperature control detection chip 23 is connected to the central controller 1 and the selection component 4; The brake system status detection chip 21 is used to detect whether the brake system 3 is offline. When the brake system status detection chip 21 detects that the brake system 3 is offline, the control port of the brake system status detection chip 21 sends a low-level control signal to the selection component 4 and sends an offline signal to the central controller 1; When the brake system state detection chip 21 detects that the brake system 3 is not offline, the control port of the brake system state detection chip 21 sends a high-level control signal to the selection component 4; The temperature sensor 22 is used to detect the operating temperature of the brake system 3; and send the temperature detection signal to the temperature control detection chip 23; The temperature control detection chip 23 is used to compare the value of the temperature detection signal with the set threshold value; When the value is less than the threshold, the control interface of the temperature control detection chip 23 outputs a high-level control signal to the selection component 4; When the value is greater than or equal to the threshold, the control interface of the temperature control detection chip 23 outputs a low-level control signal to the selection component 4, and the temperature control detection chip 23 sends a brake high temperature warning signal to the central controller 1; The selection component 4 includes a two-way selector 1 41 and a two-way selector 2 42, and the two-way selector 1 41 and the two-way selector 2 42 are of the same model; The first pin of the two-way selector 41 is electrically connected to the control interface of the temperature control detection chip 23, the second pin of the two-way selector 41 is electrically connected to the central controller 1, the C pin of the two-way selector 41 is electrically connected to the control interface of the temperature control detection chip 23, and the Y pin of the two-way selector 41 is connected to the braking energy control component 5; The first pin of the two-way selector 42 is electrically connected to the control interface of the brake system state detection chip 21, the second pin of the two-way selector 42 is electrically connected to the central controller 1, the C pin of the two-way selector 42 is electrically connected to the control interface of the brake system state detection chip 21, and the Y pin of the two-way selector 42 is connected to the brake energy control component 5; The Y pins of the two-way selector 1 41 and the two-way selector 2 42 send a start signal to the braking energy control component 5 .

[0027] The braking energy control component 5 includes a braking energy recovery starting module 51 and a braking energy converter 52. The braking energy recovery starting module 51 has two input ends and is electrically connected to the Y pins of the two-way selector 1 41 and the two-way selector 2 42 respectively. The output end of the braking energy recovery starting module 51 is connected to the braking energy converter 52. The braking energy converter 52 is connected to the power generation end of the power recovery component 6. The Y pins of the two-way selector 1 41 and the two-way selector 2 42 send a start signal to the braking energy recovery starting module 51.

[0028] When one or both of the two input ends of the braking energy recovery start module 51 receive a low-level start signal, the braking energy recovery start module 51 controls the braking energy converter 52 to be transmission-connected with the power generation end of the power recovery component 6 .

[0029] The power recovery component 6 includes a three-phase motor 61, an inverter 62 and a power battery pack 63. The output end of the three-phase motor 61 is connected to the brake energy converter 52, the three-phase terminal of the three-phase motor 61 is electrically connected to the input end of the inverter 62, and the output end of the inverter 62 is electrically connected to the power battery pack 63.

[0030] It also includes an alarm component 7 , which includes a first alarm module 71 and a second alarm module 72 . The first alarm module 71 and the second alarm module 72 are both electrically connected to the central controller 1 .

[0031] The first alarm module 71 is used for controlling the central controller 1 to issue a brake offline alarm when the central controller 1 receives an offline signal sent by the brake system status detection chip 21; The second alarm module 72 is used for controlling the central controller 1 to issue a high-temperature brake alarm when the central controller 1 receives a high-temperature brake alarm signal sent by the temperature control detection chip 23 .

[0032] When the present invention is used, the first alarm module 71 and the second alarm module 72 realize an offline alarm and a high temperature alarm for the brake system 3 .

[0033] Example 3: Figure 1-2 As shown, as a preferred embodiment of the present invention, the present invention also provides a control method for a power conversion system with a power recovery control function, comprising the following steps: Step 1: The brake system status detection chip 21 detects whether the brake system 3 is offline; Step 2: When the brake system state detection chip 21 detects that the brake system 3 is offline, the control port of the brake system state detection chip 21 sends a low-level control signal to the first pin and the C pin of the two-way selector 2 42 and sends an offline signal to the central controller 1; When the C pin of the two-way selector 42 receives a low-level control signal, the first pin of the two-way selector 42 outputs a valid signal, and the Y pin of the two-way selector 42 outputs a low-level control signal. After the braking energy recovery start module 51 receives the low-level control signal, the braking energy recovery start module 51 controls the braking energy converter 52 to be connected to the output end of the three-phase motor 61, and the AC power generated by the three-phase motor 61 is inverted into DC power by the inverter 62 and stored in the power battery pack 63; Step 3: After receiving the offline signal, the central controller 1 controls the first alarm module 71 to issue a brake offline alarm; Step 4: When the brake system state detection chip 21 detects that the brake system 3 is not offline, the control port of the brake system state detection chip 21 sends a high level control signal to the two-way selector 2 42; When the C pin of the two-way selector 42 receives a high-level control signal, the output of the second pin of the two-way selector 42 is valid, and at this time, the central controller 1 controls the output level start signal of the Y pin of the two-way selector 42; Step 5: The temperature sensor 22 detects the operating temperature of the brake system 3; and sends the temperature detection signal to the temperature control detection chip 23, and the temperature control detection chip 23 compares the value of the temperature detection signal with the set threshold value; Step 6: When the value is less than the threshold, the control interface of the temperature control detection chip 23 outputs a high-level control signal to the first pin and the C pin of the two-way selector 41; Step 7: When the C pin of the two-way selector 41 receives a high-level control signal, the second pin of the two-way selector 41 outputs a valid signal. At this time, the central controller 1 controls the output level start signal of the Y pin of the two-way selector 41; Step 8: When the value is greater than or equal to the threshold, the control interface of the temperature control detection chip 23 outputs a low-level control signal to the two-way selector 1 41, and the temperature control detection chip 23 sends a brake high temperature warning signal to the central controller 1; Step 9: When the C pin of the two-way selector 41 receives a low-level control signal, the first pin of the two-way selector 41 outputs a valid signal, and the Y pin of the two-way selector 41 outputs a low-level start signal. After the braking energy recovery start module 51 receives the low-level start signal, the braking energy recovery start module 51 controls the braking energy converter 52 to be connected to the output end of the three-phase motor 61, and the AC power generated by the three-phase motor 61 is inverted into DC power by the inverter 62 and stored in the power battery pack 63; Step 10: After the central controller 1 receives the brake high temperature warning signal, the central controller 1 controls the second alarm module 72 to issue a brake high temperature alarm.

[0034] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A power conversion system with power recovery control function, characterized in that: The invention comprises a central controller (1), a braking detection system (2), a braking system (3), a selection component (4), a braking energy control component (5) and an electric power recovery component (6), wherein the central controller (1) is connected to the braking detection system (2) and the selection component (4), the braking detection system (2) is connected to the braking system (3) and the selection component (4), and the selection component (4) is connected to the braking energy control component (5) and the electric power recovery component (6); The brake detection system (2) is used to detect the operating temperature of the brake system (3) and whether it is offline and generate a detection signal. The brake detection system (2) sends the detection signal to the central controller (1). At the same time, the brake detection system (2) sends a control signal to the selection component (4); The central controller (1) is used for a user to input an energy recovery mode and generate a control signal. The central controller (1) sends the control signal to the selection component (4). The central controller (1) is also used for analyzing and processing the detection signal. The selection component (4) is used to select according to the control signal and output a brake start signal for controlling the operation of the brake energy control component (5); The braking energy control component (5) is used to adjust the connection with the power generation end of the power recovery component (6) according to the start signal sent by the selection component (4); The power recovery component (6) is used to convert kinetic energy generated by vehicle braking into electrical energy and store it.

2. The power conversion system with power recovery control function according to claim 1, characterized in that: The brake detection system (2) comprises a brake system state detection chip (21), a temperature sensor (22) and a temperature control detection chip (23); the brake system state detection chip (21) is connected to the central controller (1), the brake system (3) and the selection component (4); the temperature sensor (22) is connected to the brake system (3) and the temperature control detection chip (23); and the temperature control detection chip (23) is connected to the central controller (1) and the selection component (4); The brake system status detection chip (21) is used to detect whether the brake system (3) is offline. When the brake system status detection chip (21) detects that the brake system (3) is offline, the control port of the brake system status detection chip (21) sends a low-level control signal to the selection component (4) and sends an offline signal to the central controller (1); When the brake system status detection chip (21) detects that the brake system (3) is not offline, the control port of the brake system status detection chip (21) sends a high-level control signal to the selection component (4); The temperature sensor (22) is used to detect the operating temperature of the brake system (3); and send a temperature detection signal to the temperature control detection chip (23); The temperature control detection chip (23) is used to compare the value of the temperature detection signal with a set threshold value; When the value is less than the threshold value, the control interface of the temperature control detection chip (23) outputs a high-level control signal to the selection component (4); When the value is greater than or equal to the threshold, the control interface of the temperature control detection chip (23) outputs a low-level control signal to the selection component (4), and at the same time the temperature control detection chip (23) sends a brake high temperature warning signal to the central controller (1).

3. The power conversion system with power recovery control function according to claim 2, characterized in that: The selection component (4) comprises a two-way selector 1 (41) and a two-way selector 2 (42), and the two-way selector 1 (41) and the two-way selector 2 (42) are of the same model; The first pin of the two-way selector 1 (41) is electrically connected to the control interface of the temperature control detection chip (23), the second pin of the two-way selector 1 (41) is electrically connected to the central controller (1), the C pin of the two-way selector 1 (41) is electrically connected to the control interface of the temperature control detection chip (23), and the Y pin of the two-way selector 1 (41) is connected to the braking energy control component (5); The first pin of the two-way selector 2 (42) is electrically connected to the control interface of the brake system state detection chip (21), the second pin of the two-way selector 2 (42) is electrically connected to the central controller (1), the C pin of the two-way selector 2 (42) is electrically connected to the control interface of the brake system state detection chip (21), and the Y pin of the two-way selector 2 (42) is connected to the brake energy control component (5); The Y pins of the two-way selector 1 (41) and the two-way selector 2 (42) send a start signal to the braking energy control component (5).

4. The power conversion system with power recovery control function according to claim 3, characterized in that: The braking energy control component (5) comprises a braking energy recovery start module (51) and a braking energy converter (52); the braking energy recovery start module (51) has two input ends and is respectively electrically connected to the Y pins of a two-way selector 1 (41) and a two-way selector 2 (42); the output end of the braking energy recovery start module (51) is connected to the braking energy converter (52); the braking energy converter (52) is connected to the power generation end of the power recovery component (6); and the Y pins of the two-way selector 1 (41) and the two-way selector 2 (42) send a start signal to the braking energy recovery start module (51).

5. The power conversion system with power recovery control function according to claim 4, characterized in that: When one or both of the two input ends of the braking energy recovery start module (51) receive a low-level start signal, the braking energy recovery start module (51) controls the braking energy converter (52) to be transmission-connected to the power generation end of the power recovery component (6).

6. The power conversion system with power recovery control function according to claim 5, characterized in that: The power recovery component (6) comprises a three-phase motor (61), an inverter (62) and a power battery pack (63); the output end of the three-phase motor (61) is connected to the brake energy converter (52); the three-phase connection terminals of the three-phase motor (61) are electrically connected to the input end of the inverter (62); and the output end of the inverter (62) is electrically connected to the power battery pack (63).

7. The power conversion system with power recovery control function according to claim 6, characterized in that: It also comprises an alarm component (7), the alarm component (7) comprising a first alarm module (71) and a second alarm module (72), the first alarm module (71) and the second alarm module (72) being both electrically connected to the central controller (1); The first alarm module (71) is used for controlling the first alarm module (71) to issue a brake offline alarm when the central controller (1) receives an offline signal sent by the brake system status detection chip (21); The second alarm module (72) is used for controlling the central controller (1) to issue a high-temperature brake alarm when the central controller (1) receives a high-temperature brake alarm signal sent by the temperature control detection chip (23).

8. A control method for a power conversion system with a power recovery control function as claimed in claim 7, characterized in that: The following steps are involved: Step 1: The braking system status detection chip (21) detects whether the braking system (3) is offline; Step 2: When the brake system status detection chip (21) detects that the brake system (3) is offline, the control port of the brake system status detection chip (21) sends a low-level control signal to the first pin and the C pin of the two-way selector 2 (42) and sends an offline signal to the central controller (1); When the C pin of the two-way selector 2 (42) receives a low-level control signal, the first pin of the two-way selector 2 (42) outputs a valid signal, and the Y pin of the two-way selector 2 (42) outputs a low-level control signal. After the braking energy recovery start module (51) receives the low-level control signal, the braking energy recovery start module (51) controls the braking energy converter (52) to be transmission-connected with the output end of the three-phase motor (61), and the alternating current generated by the three-phase motor (61) is inverted into direct current through the inverter (62) and stored in the power battery pack (63); Step 3: After the central controller (1) receives the offline signal, the central controller (1) controls the first alarm module (71) to issue a brake offline alarm; Step 4: When the brake system status detection chip (21) detects that the brake system (3) is not offline, the control port of the brake system status detection chip (21) sends a high-level control signal to the two-way selector 2 (42); When the C pin of the two-way selector 2 (42) receives a high-level control signal, the second pin of the two-way selector 2 (42) outputs a valid signal. At this time, the central controller (1) controls the output level start signal of the Y pin of the two-way selector 2 (42); Step 5: The temperature sensor (22) detects the operating temperature of the brake system (3); and sends the temperature detection signal to the temperature control detection chip (23); the temperature control detection chip (23) compares the value of the temperature detection signal with a set threshold value; Step 6: When the value is less than the threshold, the control interface of the temperature control detection chip (23) outputs a high-level control signal to the first pin and the C pin of the two-way selector 1 (41); Step 7: When the C pin of the two-way selector 1 (41) receives a high-level control signal, the second pin of the two-way selector 1 (41) outputs a valid signal. At this time, the central controller (1) controls the output level start signal of the Y pin of the two-way selector 1 (41); Step 8: When the value is greater than or equal to the threshold, the control interface of the temperature control detection chip (23) outputs a low-level control signal to the two-way selector 1 (41), and at the same time, the temperature control detection chip (23) sends a brake high temperature warning signal to the central controller (1); Step nine: when the C pin of the two-way selector 1 (41) receives a low-level control signal, the first pin of the two-way selector 1 (41) outputs a valid signal, and the Y pin of the two-way selector 1 (41) outputs a low-level start signal. After the braking energy recovery start module (51) receives the low-level start signal, the braking energy recovery start module (51) controls the braking energy converter (52) to be transmission-connected with the output end of the three-phase motor (61), and the alternating current generated by the three-phase motor (61) is inverted into direct current through the inverter (62) and stored in the power battery pack (63); Step 10: After the central controller (1) receives the brake high temperature warning signal, the central controller (1) controls the second alarm module (72) to issue a brake high temperature alarm.

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