Power-on protection device and method

Abstract

The invention discloses a power-on protection device and method, and the device is used for carrying out the power-on test of a motor controller according to a first connection path and a second connection path which are formed among a first power supply, a power-on protection unit and the motor controller. And under the condition that the input voltage of the motor controller is smaller than or equal to the preset voltage, the switch control unit controls the first connection path to be conducted and the first connection path to be disconnected. And under the condition that the input voltage of the motor controller is greater than the preset voltage, the switch control unit controls the second connection path to be switched on and the first connection path to be switched off. Wherein the resistance value of the first connecting path is greater than that of the second connecting path. Through the first connecting path and the second connecting path, the situation that the output end of the high-voltage direct-current power supply is directly and electrically connected with the bus input end of the motor controller, so that the power-on impact current is too large, and the circuit is damaged can be avoided, and the safety of the power-on process between the high-voltage direct-current power supply and the motor controller is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of electric vehicles, and in particular, relates to a power-on protection device and method. Background Art

[0002] With the continuous development of new energy, the rise of electric vehicle technology has become an inevitable trend in the future. In the field of electric vehicle technology, the motor controller is one of the core components and occupies an absolute technical position in the field of electric vehicle technology. It undertakes the important task of power output of the whole vehicle. In the process of R&D and design of the motor controller, in order to verify whether the function meets the design requirements, it is necessary to conduct a high-voltage DC power-on test.

[0003] During the experiment, because in the prior art, the high-voltage DC power supply output terminal inside the single main drive motor controller is directly connected to the motor controller bus without any protective devices in between, the power-on process between the high-voltage DC power supply and the motor controller is less safe. Summary of the invention

[0004] The embodiments of the present application provide a power-on protection device and method, which can improve the safety of the power-on process between a high-voltage direct current power supply and a motor controller.

[0005] In a first aspect, an embodiment of the present application provides a power-on protection device, which is used to perform a power-on test on a motor controller. The device may include:

[0006] First power source;

[0007] A power-on protection unit, the power-on protection unit is connected between the first power supply and the motor controller, a first connection path and a second connection path are formed between the first power supply, the power-on protection unit and the motor controller, and the resistance of the first connection path is greater than the resistance of the second connection path;

[0008] A switch control unit, the switch control unit is electrically connected to the power-on protection unit, wherein:

[0009] When the input voltage of the motor controller is less than or equal to the preset voltage, the switch control unit controls the first connection path to be turned on and the first connection path to be turned off;

[0010] When the input voltage of the motor controller is greater than the preset voltage, the switch control unit controls the second connection path to be turned on and the first connection path to be turned off.

[0011] In one embodiment, the power-on protection unit mentioned above may include:

[0012] A pre-charging resistor, wherein a first end of the pre-charging resistor is electrically connected to the positive terminal of the first power supply, and a second end of the pre-charging resistor is electrically connected to the positive terminal of the motor controller;

[0013] An anti-reverse diode is arranged between the second end of the pre-charging resistor and the positive terminal of the motor controller;

[0014] Multiple switches are electrically connected to the switch control unit, and the multiple switches include a first switch and a second switch. A first connection path is formed between the first switch, the pre-charging resistor, the anti-reverse diode, the first power supply and the motor controller, and a second connection path is formed between the second switch, the first power supply and the motor controller. The first switch is arranged between the first end of the pre-charging resistor and the positive terminal of the first power supply, and the second switch is arranged between the positive terminal of the first power supply and the positive terminal of the motor controller.

[0015] In one embodiment, the power-on protection unit mentioned above further includes:

[0016] The third switch is arranged between the negative terminal of the first power supply and the negative terminal of the motor controller, and a first connection path is formed between the first switch, the third switch, the pre-charging resistor, the anti-reverse diode, the first power supply and the motor controller, and a second connection path is formed between the second switch, the third switch, the first power supply and the motor controller.

[0017] In one embodiment, the switch control unit mentioned above includes:

[0018] Second power supply;

[0019] A plurality of control switches are provided between the second power supply and the switch control ends of the plurality of switches, and the plurality of control switches are used to control the electrical connection between the switch control ends of the plurality of switches and the second power supply to be turned on or off.

[0020] In one embodiment, the multiple control switches involved above include:

[0021] a first control switch, wherein a first normally-open end of the first control switch is electrically connected to a positive terminal of the second power supply, a second normally-open end of the first control switch is electrically connected to a second switch control end of the third switch, and a first switch control end of the third switch is electrically connected to a negative terminal of the second power supply;

[0022] a second control switch, wherein a first normally closed end of the second control switch is electrically connected to the positive terminal of the second power supply, a second normally closed end of the second control switch is electrically connected to a second normally open end of the second control switch, and a first normally open end of the second control switch is electrically connected to a first switch control end of the third switch;

[0023] a third control switch, wherein a first end of the third control switch is electrically connected to the second normally-open end of the second control switch, a second end of the third control switch is electrically connected to the first normally-open end of the second control switch, a third end of the third control switch is electrically connected to the first normally-closed end of the second control switch, a fourth end of the third control switch is electrically connected to the second switch control end of the first switch, a fifth end of the third control switch is electrically connected to the second switch control end of the third switch, a sixth end of the third control switch is electrically connected to the second switch control end of the second switch, and the first switch control end of the first switch, the first switch control end of the third switch, and the first switch control end of the second switch are electrically connected to the negative end of the second power supply, respectively.

[0024] In one embodiment, the power-on protection unit mentioned above further includes:

[0025] A circuit breaker device is provided between the plurality of switches and the first power source, and is used to control the electrical connection between the first power source and the motor controller to be turned on or off.

[0026] In one embodiment, the circuit breaker device mentioned above includes a first circuit breaker and a second circuit breaker, and the first circuit breaker and the second circuit breaker are in a synchronous off state;

[0027] The switch control unit also includes:

[0028] A first circuit breaker, the first circuit breaker is arranged between the positive terminal of the first power supply and the first terminal of the first switch;

[0029] The second circuit breaker is arranged between the negative terminal of the first power source and the first terminal of the third switch.

[0030] In one embodiment, the switch control unit mentioned above further includes:

[0031] a fourth control switch, the fourth control switch being arranged between the second power supply and the first control switch, the second control switch and the third control switch, the first normally-open end of the fourth control switch being electrically connected to the positive terminal of the second power supply, the second normally-open end of the fourth control switch being electrically connected to the negative terminal of the second power supply, the first normally-closed end of the fourth control switch being electrically connected to the positive terminal of the second power supply, and the second normally-closed end of the fourth control switch being electrically connected to the first normally-open end of the first control switch;

[0032] The release coil is arranged between the second normally open end of the fourth control switch and the negative end of the second power supply, and is used to control the closing and opening of the circuit breaker.

[0033] In a second aspect, an embodiment of the present application provides a power-on protection method, which can be applied to a power-on protection device of any embodiment of the first aspect. The method may include:

[0034] Get the input voltage of the motor controller;

[0035] When the input voltage of the motor controller is less than or equal to the preset voltage, the switch control unit controls the first connection path to be turned on and the first connection path to be turned off;

[0036] When the input voltage of the motor controller is greater than the preset voltage, the switch control unit controls the second connection path to be turned on and the first connection path to be turned off.

[0037] In one embodiment, the above method may further include:

[0038] The switch control unit controls the first connection path and the second connection path to be disconnected.

[0039] A power-on protection device and method according to an embodiment of the present application, wherein the power-on protection device is used to perform a power-on test on a motor controller, and can be based on a first connection path and a second connection path formed between a first power supply, a power-on protection unit and a motor controller. When the input voltage of the motor controller is less than or equal to a preset voltage, the switch control unit controls the first connection path to be turned on and the first connection path to be turned off. When the input voltage of the motor controller is greater than the preset voltage, the switch control unit controls the second connection path to be turned on and the first connection path to be turned off. Wherein, the resistance value of the first connection path is greater than the resistance value of the second connection path.

[0040] In this way, through the first connection path and the second connection path, it is possible to avoid direct electrical connection between the output end of the high-voltage DC power supply and the bus input end of the motor controller, which would lead to excessive power-on surge current and damage to the circuit, thereby improving the safety of the power-on process between the high-voltage DC power supply and the motor controller. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solution of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0042] Figure 1 It is a structural schematic diagram of a power-on protection device provided by an embodiment of the present application;

[0043] Figure 2 is a structural schematic diagram of a power-on protection device provided in another embodiment of the present application;

[0044] Figure 3 is a structural schematic diagram of a power-on protection device provided in yet another embodiment of the present application;

[0045] Figure 4is a structural schematic diagram of a power-on protection device provided in yet another embodiment of the present application;

[0046] Figure 5 is a structural schematic diagram of a power-on protection device provided in yet another embodiment of the present application;

[0047] Figure 6 is a structural schematic diagram of a power-on protection device provided in yet another embodiment of the present application;

[0048] Figure 7 is a structural schematic diagram of a power-on protection device provided in yet another embodiment of the present application;

[0049] Figure 8 is a structural schematic diagram of a power-on protection device provided in yet another embodiment of the present application;

[0050] Fig. 9 is a structural schematic diagram of a power-on protection device provided in yet another embodiment of the present application;

[0051] Fig.10 It is a flowchart of a power-on protection method provided by an embodiment of the present application;

[0052] Fig.11 It is a flowchart of a power-on protection method provided by another embodiment of the present application;

[0053] Fig.12 It is a structural schematic diagram of a power-on protection device provided in yet another embodiment of the present application. DETAILED DESCRIPTION

[0054] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0055] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0056] In the embodiments of the present application, the term “connection” may refer to a direct electrical connection between two components, or may refer to an electrical connection between two components via one or more other components.

[0057] It is obvious to those skilled in the art that various modifications and changes can be made in the present application without departing from the spirit or scope of the present application. Therefore, the present application is intended to cover modifications and changes of the present application that fall within the scope of the corresponding claims (technical solutions for protection) and their equivalents. It should be noted that the implementation methods provided in the embodiments of the present application can be combined with each other without contradiction.

[0058] Before describing the technical solutions provided by the embodiments of the present application, in order to facilitate the understanding of the embodiments of the present application, the present application first specifically describes the problems existing in the related art:

[0059] With the continuous development of new energy technology, the rise of electric vehicle technology has become an inevitable trend in the future. Among them, the field of electric vehicle technology involves three core components, including motor controllers, drive motors and power battery packs. Among them, the motor controller occupies an absolute technical position in the field of electric vehicle technology, and it bears the heavy responsibility of the power output of the whole vehicle. In the process of motor controller research and development, in order to fully verify whether its function meets the design requirements, it is necessary to conduct power-on experiments in the laboratory. In order to prevent the threat to personal safety caused by unconscious misoperation of the experimenter, a power-on protection device and method that meets safety requirements is hereby provided.

[0060] In addition, since the motor controllers in the current industry are generally divided into single main drive electric control and all-in-one motor controller. The existing technology in the industry is that the high-voltage circuit in the cavity of the single main drive controller does not have high-voltage anti-reverse and high-voltage pre-charging functions. However, the single main drive controller has the disadvantage of power-on. When conducting high-voltage experiments, the output end of the high-voltage DC power supply is directly connected to the bus input end of the motor controller, and there is no protection link in the middle. Therefore, the following situations may occur, resulting in low safety of the power-on process between the high-voltage DC power supply and the motor controller: 1. Unconsciously, the "positive and negative poles" of the controller bus input end are reversed, resulting in short-circuit damage to the bus capacitor. 2. In the absence of a pre-charging circuit, the high voltage is directly input, resulting in excessive power-on impact current. 3. During the test, in the event of an occasional fault, it is impossible to achieve emergency high-voltage power off. In order to solve the above technical problems, the embodiment of the present application provides a power-on protection device and method, according to the first connection path and the second connection path formed between the first power supply, the power-on protection unit and the motor controller. When the input voltage of the motor controller is less than or equal to the preset voltage, the switch control unit controls the first connection path to be turned on and the first connection path to be disconnected. When the input voltage of the motor controller is greater than the preset voltage, the switch control unit controls the second connection path to be turned on and the first connection path to be turned off. The resistance of the first connection path is greater than the resistance of the second connection path. Through the first connection path and the second connection path, it is possible to avoid the output end of the high-voltage DC power supply being directly electrically connected to the bus input end of the motor controller, thereby preventing the power-on impact current from being too large and damaging the circuit, thereby improving the safety of the power-on process between the high-voltage DC power supply and the motor controller.

[0061] The embodiments of the power-on protection device and method will be described below in conjunction with the accompanying drawings.

[0062] The following first introduces the power-on protection device provided by the embodiment of the present application. Figure 1 As shown, the power-on protection device 100 provided in the embodiment of the present application may include:

[0063] A first power source 10;

[0064] Among them, the power-on protection device 100 is used to perform a power-on test on the motor controller 20;

[0065] A power-on protection unit 30, which is connected between the first power supply and the motor controller 20, and a first connection path 31 and a second connection path 32 are formed between the first power supply, the power-on protection unit and the motor controller, and the resistance of the first connection path is greater than the resistance of the second connection path;

[0066] The switch control unit 40 is electrically connected to the power-on protection unit, wherein:

[0067] When the input voltage of the motor controller is less than or equal to the preset voltage, the switch control unit controls the first connection path to be turned on and the first connection path to be turned off;

[0068] When the input voltage of the motor controller is greater than the preset voltage, the switch control unit controls the second connection path to be turned on and the first connection path to be turned off.

[0069] Therefore, through the first connection path and the second connection path, it is possible to avoid direct electrical connection between the output end of the high-voltage DC power supply and the bus input end of the motor controller, which would lead to excessive power-on surge current and damage to the circuit, thereby improving the safety of the power-on process between the high-voltage DC power supply and the motor controller.

[0070] It should be noted that the motor controller is not a component of the power-on protection device, but an experimental object of the power-on protection device. The power-on protection device can be used to perform power-on tests on the motor controller. For example, when developing and designing a motor controller, in order to fully verify whether its functions meet the design requirements, it is necessary to perform a power-on test on it in the laboratory. In order to prevent the test personnel from affecting personal safety due to unconscious operations, the power-on protection device is used to ensure the safety requirements of the laboratory.

[0071] In one example, the first power supply may be a high-voltage DC power supply. The first end of the power-on protection unit is electrically connected to the positive terminal of the first power supply, and the second end of the power-on protection unit is electrically connected to the positive terminal of the motor controller. A first connection path and a second connection path may be formed between the first power supply, the power-on protection unit, and the motor controller, and a resistance of the first connection path may be made greater than a resistance of the second connection path by connecting a series resistor in the first connection path. In one example, the first connection path is a pre-charge circuit, which can avoid excessive power-on shock current when the high-voltage DC power supply and the motor controller are connected.

[0072] The switch control unit is electrically connected to the control end of the switch in the power-on protection unit, and can control the change of the working state of the switch in the power-on protection unit by sending a conduction signal or turning on the switch in the power-on protection unit, where the working state includes an on state and an off state.

[0073] In one example, the power-on protection unit includes a plurality of switches, which may be contactors. The switch control unit may include a plurality of control switches, which may include contactors, self-locking push button switches, and reset push button switches. The push button switches include at least one pair of normally closed contacts and one pair of normally open contacts.

[0074] In one embodiment, the positive terminal and the negative terminal of the motor controller are electrically connected to the positive terminal and the negative terminal of the first voltmeter, respectively, and the input voltage of the motor controller can be obtained through the reading of the first voltmeter. When the input voltage of the motor controller is less than or equal to the preset normal power supply voltage, the switch control unit controls the first connection path to be turned on and the second connection path to be turned off, even if the pre-charge circuit is turned on. When the input voltage of the motor controller reaches the normal power supply voltage, the switch control unit controls the first connection path to be turned off and the second connection path to be turned on, even if the pre-charge circuit is turned off, and the high-voltage DC power supply is connected to the motor controller.

[0075] like Figure 2 As shown, in a specific embodiment, the power-on protection unit 30 may include:

[0076] A pre-charging resistor R1, wherein a first end of the pre-charging resistor is electrically connected to the positive terminal of the first power supply, and a second end of the pre-charging resistor is electrically connected to the positive terminal of the motor controller;

[0077] The anti-reverse diode D1 is arranged between the second end of the pre-charging resistor and the positive terminal of the motor controller;

[0078] Multiple switches 33 are electrically connected to the switch control unit, and the multiple switches include a first switch KM1 and a second switch KM2. A first connection path is formed between the first switch, the pre-charging resistor, the anti-reverse diode, the first power supply and the motor controller, and a second connection path is formed between the second switch, the first power supply and the motor controller. The first switch is arranged between the first end of the pre-charging resistor and the positive terminal of the first power supply, and the second switch is arranged between the positive terminal of the first power supply and the positive terminal of the motor controller.

[0079] In one example, the size of the pre-charging resistor can be determined based on the bus voltage, the capacitance requirement, and the charging time, which are not limited here. The size of the anti-reverse diode can be determined based on the maximum charging current, which are not limited here.

[0080] Among them, a first connection path is formed between the first switch, the pre-charging resistor, the anti-reverse diode, the first power supply and the motor controller, and a second connection path is formed between the second switch, the first power supply and the motor controller. By setting a pre-charging circuit, the safety of the power-on protection device can be improved.

[0081] In a specific embodiment, Figure 3 As shown, the power-on protection unit 30 may further include:

[0082] The third switch KM3 is arranged between the negative terminal of the first power supply and the negative terminal of the motor controller, and a first connection path is formed between the first switch, the third switch, the pre-charging resistor, the anti-reverse diode, the first power supply and the motor controller, and a second connection path is formed between the second switch, the third switch, the first power supply and the motor controller.

[0083] In a specific embodiment, when the input voltage of the motor controller is less than or equal to the preset voltage, the first connection path is controlled to be turned on and the first connection path is turned off by controlling the first switch and the third switch to be closed and the second switch to be opened. When the input voltage of the motor controller is greater than the preset voltage, the second connection path is controlled to be turned on and the first connection path is turned off by controlling the second switch and the third switch to be closed and the third switch to be opened.

[0084] In a specific embodiment, Figure 4 As shown, the switch control unit 40 may include:

[0085] A second power source 41;

[0086] A plurality of control switches 42 are provided between the second power source and the switch control ends of the plurality of switches, and are used to control the electrical connection between the switch control ends of the plurality of switches and the second power source to be turned on or off.

[0087] In one example, the second power supply may be a low voltage, such as a 24V DC low voltage converted from a 220V switching AC power supply. The control switch may be a contactor, and in a specific embodiment may include a self-locking push button switch, a reset push button switch, and a time relay.

[0088] In a specific embodiment, Figure 5 As shown, the multiple control switches 42 may specifically include:

[0089] A first control switch SB1, wherein a first normally-open end of the first control switch is electrically connected to the positive terminal of the second power supply, a second normally-open end of the first control switch is electrically connected to the second switch control end of the third switch, and a first switch control end of the third switch is electrically connected to the negative terminal of the second power supply;

[0090] A second control switch SB2, wherein a first normally closed end of the second control switch is electrically connected to the positive terminal of the second power supply, a second normally closed end of the second control switch is electrically connected to a second normally open end of the second control switch, and a first normally open end of the second control switch is electrically connected to a first switch control end of the third switch;

[0091] The third control switch KM4, the first end of the third control switch is electrically connected to the second normally-open end of the second control switch, the second end of the third control switch is electrically connected to the first normally-open end of the second control switch, the third end of the third control switch is electrically connected to the first normally-closed end of the second control switch, the fourth end of the third control switch is electrically connected to the second switch control end of the first switch, the fifth end of the third control switch is electrically connected to the second switch control end of the third switch, the sixth end of the third control switch is electrically connected to the second switch control end of the second switch, the first switch control end of the first switch, the first switch control end of the third switch and the first switch control end of the second switch are electrically connected to the negative end of the second power supply respectively.

[0092] In one example, the first control switch may be a self-locking push button switch, the second control switch may be a reset push button switch, and the third control switch may be a time relay triggered by a low-side signal. When the first control switch is pressed, the normally closed end of the first control switch is disconnected and the normally open end is closed, and the above state is maintained after the first control switch is released. When the second control switch is pressed, the normally open end of the second control switch is closed and the normally closed end is disconnected, and the state before the control switch is released is restored to the state before the pressing. And when the second control switch is pressed, the second control switch sends a low-side signal to the third control switch, so that the third control switch starts timing and counting, and when the preset time is reached, the normally closed contact of the third control switch is disconnected and the normally open contact is closed.

[0093] Therefore, by setting a plurality of control switches in the switch control unit to control a plurality of switches in the power-on protection device, the switch control logic in the high voltage loop can be realized by controlling the low voltage.

[0094] In a specific embodiment, Figure 6 As shown, the power-on protection unit 30 may further include:

[0095] The circuit breaker device 34 is arranged between the plurality of switches and the first power source, and is used to control the electrical connection between the first power source and the motor controller to be turned on or off.

[0096] Among them, the circuit breaker device can promptly and effectively cut off the high-voltage circuit when the contactor sticks, thereby improving the safety of the power-on protection device.

[0097] In one embodiment, Figure 7 As shown, the circuit breaker device 34 includes a first circuit breaker CB1 and a second circuit breaker CB2, and the off states of the first circuit breaker and the second circuit breaker are synchronized;

[0098] The switch control unit also includes:

[0099] A first circuit breaker CB1, the first circuit breaker is arranged between the positive terminal of the first power supply and the first terminal of the first switch;

[0100] The second circuit breaker CB2 is disposed between the negative terminal of the first power source and the first terminal of the third switch.

[0101] In one example, the circuit breaker is opened by controlling the circuit breaker trip coil, and the first circuit breaker and the second circuit breaker are opened or closed at the same time.

[0102] In one embodiment, Figure 8 As shown, the switch control unit 40 also includes:

[0103] A fourth control switch SB3, the fourth control switch is arranged between the second power supply and the first control switch, the second control switch and the third control switch, the first normally open end of the fourth control switch is electrically connected to the positive end of the second power supply, the second normally open end of the fourth control switch is electrically connected to the negative end of the second power supply, the first normally closed end of the fourth control switch is electrically connected to the positive end of the second power supply, and the second normally closed end of the fourth control switch is electrically connected to the first normally open end of the first control switch;

[0104] The release coil 43 is arranged between the second normally open end of the fourth control switch and the negative end of the second power supply, and is used to control the closing and opening of the circuit breaker.

[0105] In one example, the third control switch is an emergency stop switch. When emergency power-off is required, the third control switch is pressed to automatically disconnect all circuit breakers and all contactors in the power-on protection device.

[0106] Therefore, through the third control switch and the release coil, when emergency power-off is required, all circuit breakers and contactors can be disconnected by one button to further improve the safety of the power-on protection device.

[0107] The following is a specific embodiment, combined with Fig. 9 , the principle of power-on protection device is introduced in detail. Fig. 9 As shown, the switch control unit may further include a second voltmeter V1, an indicator light D2, a pre-charge indicator light D3 and a power-on indicator light D4. The two ends of the second voltmeter are respectively electrically connected to the positive terminal and the negative terminal of the second power supply, the indicator light is connected in parallel with the second voltmeter, the pre-charge indicator light is connected in parallel with the second switch, and the power-on indicator light is connected in parallel with the first switch.

[0108] During the power-on process, the circuit breaker is first attracted, the indicator light comes on, and the second voltmeter shows that power is on. After passing through the normally closed contact of the fourth control switch, the normally open contact of the first control switch closes, controlling the second control switch to close. At the same time, the normally closed end of the third control switch is energized, the pre-charge indicator light comes on, and the second switch is closed. When the voltage of the first voltmeter shows the normal power supply voltage, press the second control switch. After pressing the second control switch to send a low-level signal to the third control switch, the third control switch starts counting down. When the time is up, the normally closed contact of the third control switch opens and the normally open contact closes. At this time, the second switch opens, the pre-charge indicator light goes out, the first switch closes, and the power-on indicator light comes on.

[0109] During the power-off process, manually disconnect the circuit breaker, and then press the first control switch to disconnect the first switch and the third switch. When the power is off in an emergency, press the fourth control switch to automatically disconnect all circuit breakers and all contactors in the power-on protection device.

[0110] Based on any of the power-on protection devices in the above embodiments, the power-on protection method provided in the embodiments of the present application is introduced below. Fig.10 As shown, the power-on protection method provided in the embodiment of the present application includes the following steps:

[0111] S1001: Obtain the input voltage of the motor controller;

[0112] S1002: When the input voltage of the motor controller is less than or equal to the preset voltage, the switch control unit controls the first connection path to be turned on and the first connection path to be turned off;

[0113] S1003: When the input voltage of the motor controller is greater than the preset voltage, the switch control unit controls the second connection path to be turned on and the first connection path to be turned off.

[0114] According to the first connection path and the second connection path formed between the first power supply, the power-on protection unit and the motor controller. When the input voltage of the motor controller is less than or equal to the preset voltage, the switch control unit controls the first connection path to be turned on and the first connection path to be turned off. When the input voltage of the motor controller is greater than the preset voltage, the switch control unit controls the second connection path to be turned on and the first connection path to be turned off. Among them, the resistance of the first connection path is greater than the resistance of the second connection path. Through the first connection path and the second connection path, it is possible to avoid direct electrical connection between the output end of the high-voltage DC power supply and the bus input end of the motor controller, thereby preventing the power-on impact current from being too large and damaging the circuit, thereby improving the safety of the power-on process between the high-voltage DC power supply and the motor controller.

[0115] In S1001 , the input voltage of the motor controller is obtained. In one example, the input voltage of the motor controller can be obtained through a voltmeter connected in parallel with the motor controller.

[0116] In S1002, the preset voltage may be a preset power supply voltage set according to actual needs, which is not specifically limited herein. In one example, when the input voltage of the motor controller is less than or equal to the preset voltage, the first connection path is controlled to be turned on and the first connection path is turned off by controlling the first switch and the third switch to be closed and the second switch to be opened.

[0117] In S1003 , in one example, when the input voltage of the motor controller is greater than a preset voltage, the second connection path is controlled to be turned on and the first connection path is turned off by controlling the second switch and the third switch to be closed and the third switch to be turned off.

[0118] In one example, if Fig.11 As shown, the power-on protection method further includes the following steps:

[0119] S1101: The switch control unit controls the first connection path and the second connection path to be disconnected.

[0120] In S1101, when the motor controller needs to be powered off, the circuit breaker is controlled to be disconnected, and then the first switch and the third switch are disconnected by the first control switch, so that the first connection path and the second connection path are disconnected. Alternatively, the first connection path and the second connection path are controlled to be disconnected by controlling the fourth control switch.

[0121] Based on the power-on protection method provided in the above embodiment, Fig.12 As shown, the embodiment of the present application further provides a power-on protection device 1200, the device comprising:

[0122] An acquisition module 1201 is used to acquire an input voltage of a motor controller;

[0123] The first control module 1202 is used for controlling the switch control unit to connect the first connection path and disconnect the first connection path when the input voltage of the motor controller is less than or equal to a preset voltage;

[0124] The second control module 1203 is used for controlling the switch control unit to connect the second connection path and disconnect the first connection path when the input voltage of the motor controller is greater than a preset voltage.

[0125] In one embodiment, the power-on protection device 1200 may further include:

[0126] The third control module 1204 is used for the switch control unit to control the first connection path and the second connection path to be disconnected.

Claims

1. A power-on protection device, characterized in that: The power-on protection device is used to perform a power-on test on the motor controller, including: First power source; A power-on protection unit, wherein the power-on protection unit is connected between the first power supply and the motor controller, a first connection path and a second connection path are formed between the first power supply, the power-on protection unit and the motor controller, and a resistance value of the first connection path is greater than a resistance value of the second connection path; A switch control unit, the switch control unit is electrically connected to the power-on protection unit, wherein: When the input voltage of the motor controller is less than or equal to a preset voltage, the switch control unit controls the first connection path to be turned on and the first connection path to be turned off; When the input voltage of the motor controller is greater than the preset voltage, the switch control unit controls the second connection path to be turned on and the first connection path to be turned off.

2. The device according to claim 1, characterized in that The power-on protection unit comprises: A pre-charging resistor, wherein a first end of the pre-charging resistor is electrically connected to the positive terminal of the first power supply, and a second end of the pre-charging resistor is electrically connected to the positive terminal of the motor controller; An anti-reverse diode, the anti-reverse diode is arranged between the second end of the pre-charging resistor and the positive terminal of the motor controller; A plurality of switches are electrically connected to the switch control unit, the plurality of switches include a first switch and a second switch, a first connection path is formed between the first switch, the pre-charging resistor, the anti-reverse diode, the first power supply and the motor controller, a second connection path is formed between the second switch, the first power supply and the motor controller, the first switch is arranged between the first end of the pre-charging resistor and the positive terminal of the first power supply, and the second switch is arranged between the positive terminal of the first power supply and the positive terminal of the motor controller.

3. The device according to claim 2, characterized in that The power-on protection unit also includes: A third switch, wherein the third switch is arranged between the negative terminal of the first power supply and the negative terminal of the motor controller, a first connection path is formed between the first switch, the third switch, the pre-charge resistor, the anti-reverse diode, the first power supply and the motor controller, and a second connection path is formed between the second switch, the third switch, the first power supply and the motor controller.

4. The device according to claim 3, characterized in that The switch control unit comprises: Second power supply; A plurality of control switches are provided between the second power supply and the switch control ends of the plurality of switches, and the plurality of control switches are used to control the electrical connection between the switch control ends of the plurality of switches and the second power supply to be turned on or off.

5. The power-on protection device according to claim 4, characterized in that: The plurality of control switches include: a first control switch, wherein a first normally-open end of the first control switch is electrically connected to a positive terminal of the second power supply, a second normally-open end of the first control switch is electrically connected to a second switch control end of the third switch, and a first switch control end of the third switch is electrically connected to a negative terminal of the second power supply; a second control switch, wherein a first normally closed end of the second control switch is electrically connected to the positive terminal of the second power supply, a second normally closed end of the second control switch is electrically connected to the second normally open end of the second control switch, and a first normally open end of the second control switch is electrically connected to the first switch control end of the third switch; a third control switch, wherein a first end of the third control switch is electrically connected to the second normally-open end of the second control switch, a second end of the third control switch is electrically connected to the first normally-open end of the second control switch, a third end of the third control switch is electrically connected to the first normally-closed end of the second control switch, a fourth end of the third control switch is electrically connected to the second switch control end of the first switch, a fifth end of the third control switch is electrically connected to the second switch control end of the third switch, a sixth end of the third control switch is electrically connected to the second switch control end of the second switch, and the first switch control end of the first switch, the first switch control end of the third switch and the first switch control end of the second switch are electrically connected to the negative terminal of the second power supply, respectively.

6. The power-on protection device according to claim 5, characterized in that: The power-on protection unit further includes: A circuit breaker device is provided between the plurality of switches and the first power source, and is used for controlling the electrical connection between the first power source and the motor controller to be turned on or off.

7. The power-on protection device according to claim 6, characterized in that: The circuit breaker device comprises a first circuit breaker and a second circuit breaker, and the first circuit breaker and the second circuit breaker are in a synchronous off state; The switch control unit further includes: a first circuit breaker, the first circuit breaker being disposed between a positive terminal of the first power source and a first terminal of the first switch; A second circuit breaker is disposed between the negative terminal of the first power source and the first terminal of the third switch.

8. The power-on protection device according to claim 7, characterized in that: The switch control unit also includes: a fourth control switch, the fourth control switch being arranged between the second power supply and the first control switch, the second control switch and the third control switch, the first normally-open end of the fourth control switch being electrically connected to the positive terminal of the second power supply, the second normally-open end of the fourth control switch being electrically connected to the negative terminal of the second power supply, the first normally-closed end of the fourth control switch being electrically connected to the positive terminal of the second power supply, and the second normally-closed end of the fourth control switch being electrically connected to the first normally-open end of the first control switch; A tripper coil, wherein the tripper coil is arranged between the second normally open end of the fourth control switch and the negative end of the second power supply, and the tripper coil is used to control the closing and opening of the circuit breaker.

9. A power-on protection method, characterized in that: The power-on protection device according to any one of claims 1 to 8 comprises: Get the input voltage of the motor controller; When the input voltage of the motor controller is less than or equal to a preset voltage, the switch control unit controls the first connection path to be turned on and the first connection path to be turned off; When the input voltage of the motor controller is greater than the preset voltage, the switch control unit controls the second connection path to be turned on and the first connection path to be turned off.

10. The power-on protection method according to claim 9, characterized in that: The method may further include: The switch control unit controls the first connection path and the second connection path to be disconnected.

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