Contactor and method and circuit therefor, device, medium, product, apparatus, and vehicle

Abstract

Disclosed is a vehicle. The vehicle comprises an electronic device or a power electronic apparatus, or the vehicle comprises a contactor control circuit and / or a contactor. Further disclosed are a contactor control method, a computer-readable storage medium, and a computer program product. The contactor control method comprises: when a contactor is in an attracted state, acquiring actual detection information of the contactor; and on the basis of the actual detection information, adjusting a current value of a coil in the contactor, so that the actual detection information is within an expected value range.

Description

Contactors and methods, circuits, devices, media, products, apparatuses and vehicles

[0001] Cross-reference of related applications

[0002] This application claims priority to Chinese Patent Application No. 202411936312.3, filed on December 24, 2024, with the China National Intellectual Property Administration, entitled "Contactor and Method, Circuit, Apparatus, Medium, Product, Device and Vehicle", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of contactor technology, and in particular to a contactor control method, electronic equipment, computer-readable storage medium, contactor control circuit and contactor, power electronic device and vehicle. Background Technology

[0004] Contactors are crucial components in electrical control systems, their primary function being to open and close circuits using the magnetic field generated by a coil. Contactors are widely used in motor control, electrical protection, automation equipment, high-voltage power systems, and vehicles, among other fields. They control the flow of current by electromagnetically engaging or disengaging contacts, thereby enabling the start and stop of circuits.

[0005] Existing contactor control methods primarily rely on fixed voltage or current to drive the contactor coil, lacking an effective feedback regulation mechanism and failing to precisely adjust the coil current according to the actual needs of the contactor. This can lead to problems such as unstable current, coil overheating, and energy waste during operation, consequently failing to ensure stable and reliable current support during contactor engagement and disengagement. Excessive or insufficient contactor coil current may affect the contactor's engagement and disengagement performance, thereby reducing the stability and reliability of contactor operation and further impacting the normal operation of the entire electrical system.

[0006] Public content

[0007] This disclosure aims to at least address one of the technical problems existing in the prior art. To this end, one object of this disclosure is to propose a contactor control method that achieves closed-loop feedback control of the contactor's control signal using actual detection information, optimizing the contactor's operating state and thereby improving the contactor's operational stability and reliability.

[0008] The second objective of this disclosure is to propose an electronic device.

[0009] A third objective of this disclosure is to provide a computer-readable storage medium.

[0010] The fourth objective of this disclosure is to provide a computer program product.

[0011] The fifth objective of this disclosure is to provide a contactor control circuit.

[0012] The sixth objective of this disclosure is to propose a contactor.

[0013] The seventh objective of this disclosure is to provide a power electronic device.

[0014] The eighth objective of this disclosure is to propose a vehicle.

[0015] To achieve the above objectives, a contactor control method according to a first aspect of this disclosure includes: acquiring actual detection information of the contactor when the contactor is in an engaged state; and adjusting the current value of the contactor coil according to the actual detection information so that the actual detection information is within a desired range.

[0016] According to the contactor control method of this disclosure, by acquiring the actual detection information of the contactor when it is in the engaged state, the current operating state of the contactor can be reflected. Based on this actual detection information, the control signal of the contactor can be precisely adjusted, thereby controlling the engaged state of the contactor. This achieves a closed-loop feedback control mechanism, ensuring that the actual detection information is within the desired range. In this way, this disclosure achieves precise adjustment of the contactor's operating state, avoiding instability problems such as excessive or insufficient current, improving the operational stability and reliability of the contactor, and thus enhancing the safety and reliability of the entire electrical system.

[0017] In some embodiments, the actual detection information includes the actual detection current value of the contactor coil; adjusting the current value of the contactor coil according to the actual detection information includes: determining a target control signal to maintain the contactor engagement based on the actual detection current value and the control current value of the contactor coil, so as to adjust the current value of the contactor coil.

[0018] In some embodiments, determining a target control signal to maintain the contactor engagement based on the actual detected current value and the control current value of the contactor coil includes: determining a target duty cycle of a pulse modulation signal to maintain the contactor engagement based on the relative magnitudes of the actual detected current value and the control current value of the contactor coil.

[0019] In some embodiments, determining the target duty cycle of the pulse modulation signal for maintaining the contactor engagement based on the magnitude of the actual detected current value and the control current value of the contactor coil includes: when the actual detected current value is greater than the control current value, the target duty cycle is the current duty cycle of the pulse modulation signal reduced by a preset duty cycle adjustment step size; or, when the actual detected current value is less than the control current value, the target duty cycle is the current duty cycle of the pulse modulation signal increased by a preset duty cycle adjustment step size; or, when the actual detected current value is equal to the control current value, the target duty cycle is the current duty cycle of the pulse modulation signal.

[0020] In some embodiments, the actual detection information includes the actual engagement pressure value of the contactor; adjusting the current value of the contactor coil according to the actual detection information includes: determining a target control signal to maintain the contactor engagement based on the actual engagement pressure value, so as to adjust the current value of the contactor coil.

[0021] In some embodiments, the actual engagement pressure value is the engagement pressure value between the stationary contact and the moving contact of the contactor.

[0022] In some embodiments, determining a target control signal to maintain the contactor engagement based on the actual engagement pressure value includes: determining the target control signal to maintain the contactor engagement based on the actual engagement pressure value and the desired engagement pressure value of the contactor.

[0023] In some embodiments, determining a target control signal to maintain contactor engagement based on the actual engagement pressure value and the desired engagement pressure value of the contactor includes: determining a target duty cycle of a pulse adjustment signal to maintain contactor engagement based on the relative magnitudes of the actual engagement pressure value and the desired engagement pressure value.

[0024] In some embodiments, determining the target duty cycle of the pulse modulation signal for maintaining the contactor engagement based on the relative magnitude of the actual engagement pressure value and the desired engagement pressure value includes: when the actual engagement pressure value is greater than the desired engagement pressure value, the target duty cycle is the duty cycle of the current duty cycle of the pulse modulation signal reduced by a preset duty cycle adjustment step; or, when the actual engagement pressure value is less than the desired engagement pressure value, the target duty cycle is the duty cycle of the current duty cycle of the pulse modulation signal increased by a preset duty cycle adjustment step; or, when the actual engagement pressure value is equal to the desired engagement pressure value, the target duty cycle is the current duty cycle of the pulse modulation signal.

[0025] In some embodiments, the contactor control method further includes: generating a pull-in control signal based on the pull-in control current required by the contactor coil of the contactor in response to a contactor pull-in trigger signal; and controlling the switching state of a switching circuit for controlling the energized state of the contactor coil based on the pull-in control signal, so as to cause the contactor to pull in.

[0026] In some embodiments, controlling the switching state of a switching circuit for controlling the energization state of the contactor coil according to the engagement control signal includes: controlling the switching time of the switching circuit according to the engagement control signal.

[0027] In some embodiments, the pull-in control signal is a pulse modulation signal, and controlling the switching time of the switching circuit according to the pull-in control signal includes: controlling the switching time of the switching circuit according to the duty cycle of the pulse modulation signal corresponding to the pull-in control signal.

[0028] In some embodiments, the amplitude of the pulse adjustment signal corresponding to the engagement control signal is greater than the amplitude of the pulse adjustment signal when the contactor is in the engaged state.

[0029] In some embodiments, the contactor control method further includes: responding to a de-energization signal of the contactor coil, and after a preset time delay, stopping the transmission of the control signal to the switching circuit used to control the energization state of the contactor coil.

[0030] In some embodiments, the contactor control method further includes: determining the circuit connection state of the contactor coil and the switching circuit before generating a pull-in control signal based on the pull-in control current required by the contactor coil of the contactor.

[0031] In some embodiments, determining the circuit connection state of the contactor coil and the switch circuit includes: when the contactor coil and the switch circuit are in the target state, if the detection signal of the target detection point satisfies the condition that the switch circuit is connected normally, then it is determined that the circuit connection of the contactor coil and the switch circuit is normal.

[0032] In some embodiments, when the contactor coil and the switching circuit are in the target state, the detection signal of the target detection point satisfies the condition that the switching circuit is connected normally, including: when the contactor coil is not energized and the switching circuit is in the open state, the detection signal of the target detection point is low level; when the contactor coil is energized and the switching circuit is in the open state, the detection signal of the target detection point is high level; and when the contactor coil is energized and the switching circuit is in the on state for a preset time, the detection signal of the target detection point is low level.

[0033] To achieve the above objectives, an electronic device according to a second aspect of this disclosure includes: at least one processor; a memory communicatively connected to the at least one processor; the memory storing a computer program executable by the at least one processor, wherein the at least one processor executes the computer program to implement the contactor control method described in the above embodiment.

[0034] According to the electronic device of this disclosure, at least one processor executes a computer program that implements the contactor control method described in the above embodiments. Specifically, by acquiring the actual detection information of the contactor when it is in the engaged state, the current operating state of the contactor can be reflected. Based on this actual detection information, the control signal of the contactor can be precisely adjusted, thereby controlling the engaged state of the contactor. This achieves a closed-loop feedback control mechanism, ensuring that the actual detection information of the contactor is within the desired range. In this way, this disclosure achieves precise adjustment of the contactor's operating state, avoiding instability problems such as excessive or insufficient current, improving the operational stability and reliability of the contactor, and thus enhancing the safety and reliability of the entire electrical system.

[0035] To achieve the above objectives, a computer-readable storage medium according to a third aspect of this disclosure stores a computer program thereon, which, when executed, implements the contactor control method described in the above embodiments.

[0036] According to the computer-readable storage medium of this disclosure, by employing the contactor control method described in the above embodiments, that is, by acquiring the actual detection information of the contactor when it is in the engaged state, the current operating state of the contactor can be reflected. Based on the actual detection information, the control signal of the contactor can be precisely adjusted, thereby controlling the engaged state of the contactor. This achieves a closed-loop feedback control mechanism, ensuring that the actual detection information of the contactor is within the desired range. In this way, this disclosure achieves precise adjustment of the contactor's operating state, avoiding instability problems such as excessive or insufficient current, improving the operational stability and reliability of the contactor, and thus enhancing the safety and reliability of the entire electrical system.

[0037] To achieve the above objectives, a computer program product according to a fourth aspect of this disclosure stores a computer program that, when executed, implements the contactor control method described in the above embodiments.

[0038] According to the computer program product of this disclosure, by executing the computer program that implements the contactor control method described in the above embodiments, that is, by acquiring the actual detection information of the contactor when it is in the engaged state, the current operating state of the contactor can be reflected. Based on the actual detection information, the control signal of the contactor can be precisely adjusted, thereby controlling the engaged state of the contactor. This achieves a closed-loop feedback control mechanism, ensuring that the actual detection information of the contactor is within the desired range. In this way, this disclosure achieves precise adjustment of the contactor's operating state, avoiding instability problems such as excessive or insufficient current, improving the operational stability and reliability of the contactor, and thus enhancing the safety and reliability of the entire electrical system.

[0039] To achieve the above objectives, a contactor control circuit according to a fifth aspect embodiment of the present disclosure includes: a switching circuit, a first terminal of which is adapted to be connected to a first terminal of a contactor coil; and a controller connected to a control terminal of the switching circuit for controlling the switching state of the switching circuit according to the contactor control method described in the above embodiments.

[0040] According to the contactor control circuit of this disclosure, by connecting the switching circuit to the first end of the contactor coil and the controller to the control terminal of the switching circuit, and controlling the switching state of the switching circuit according to the contactor control method described in the above embodiment, the operating state of the contactor can be adjusted in real time. Specifically, by acquiring the actual detection information of the contactor when it is in the energized state, the current operating state of the contactor can be reflected. Through the actual detection information, the switching state of the switching circuit can be precisely controlled, thereby controlling the energized state of the contactor. This realizes a closed-loop feedback control mechanism that uses actual detection information to adjust the control signal of the contactor, so that the actual detection information of the contactor is within the expected range. In this way, this disclosure achieves precise adjustment of the contactor's operating state, avoids instability problems such as excessive or insufficient current, improves the operating stability and reliability of the contactor, and thus enhances the safety and reliability of the entire electrical system.

[0041] In some embodiments, the switching circuit includes a switching transistor, a first terminal of which is adapted to be connected to the contactor coil, and a second terminal of which is grounded.

[0042] In some embodiments, the switching circuit further includes a current limiting unit, a first end of which is connected to the control terminal of the switching transistor, and a second end of which is connected to the controller, for limiting the current input to the control terminal of the switching transistor.

[0043] In some embodiments, the switching circuit further includes a reference voltage unit, a first terminal of which is connected to the control terminal of the switching transistor, and a second terminal of which is grounded, for providing a reference voltage to the switching transistor.

[0044] In some embodiments, the contactor control circuit further includes: a protection unit, a first end of which is adapted to be connected to a second end of the contactor coil and a power supply, a second end of which is adapted to be connected to a first end of the contactor coil, and a second end of which is connected to a first end of the switching circuit, for forming a circuit with the contactor coil to absorb surge signals at the moment the contactor coil is de-energized.

[0045] In some embodiments, the protection unit includes: a diode, the cathode of which is adapted to be connected to a second terminal of the contactor coil and a power supply; and a resistor, the first terminal of which is connected to the anode of the diode, the second terminal of which is adapted to be connected to a first terminal of the contactor coil, and the second terminal of which is connected to a first terminal of the switching circuit.

[0046] In some embodiments, the contactor control circuit further includes a current detection unit connected in series with the contactor coil of the contactor, for detecting the actual detected current value of the contactor coil of the contactor, and the current detection unit is also connected to the controller to send the actual detected current value to the controller.

[0047] In some embodiments, the controller is also adapted to be connected to a pressure detection unit for detecting the actual engagement pressure value of the contactor, so as to obtain the actual engagement pressure value of the contactor.

[0048] To achieve the above objectives, a contactor according to a sixth aspect of this disclosure includes a contactor coil, a stationary contact, a moving contact, and a pressure sensor. The pressure sensor is connected to a controller in the contactor control circuit of the above embodiment. The pressure sensor is used to detect the actual engagement pressure value between the stationary contact and the moving contact in the engagement state.

[0049] According to embodiments of the contactor disclosed herein, by incorporating a pressure sensor, the actual engagement pressure between the stationary and moving contacts in the engaged state can be detected in real time. When insufficient or excessive engagement pressure is detected, the pressure sensor generates a feedback signal and transmits it to the system, thereby controlling the contactor's engagement state and ensuring that an appropriate engagement pressure is maintained between the stationary and moving contacts. This closed-loop feedback control mechanism effectively avoids poor electrical contact due to insufficient pressure and mechanical wear caused by excessive pressure, thus improving the stability and reliability of the contactor in the engaged state.

[0050] In some embodiments, the pressure sensor is disposed on the stationary contact and / or the moving contact.

[0051] In some embodiments, the pressure sensor is disposed inside the stationary contact.

[0052] To achieve the above objectives, the power electronic device according to the seventh aspect of this disclosure includes the contactor control circuit and / or the contactor described in the above embodiments.

[0053] According to the power electronic device of this disclosure, by integrating the contactor control circuit and / or contactor described in the above embodiments, precise control of the contactor's operating state can be achieved. Specifically, by acquiring the actual detection information of the contactor when it is in the energized state, the current operating state of the contactor can be reflected. Through this actual detection information, the switching state of the switching circuit can be precisely controlled, thereby controlling the energized state of the contactor. This achieves a closed-loop feedback control mechanism that uses actual detection information to adjust the control signal of the contactor, ensuring that the actual detection information of the contactor coil is within the desired range. In this way, this disclosure achieves precise adjustment of the contactor's operating state, avoiding instability problems such as excessive or insufficient current, improving the contactor's operational stability and reliability, and thus enhancing the safety and reliability of the entire electrical system.

[0054] To achieve the above objectives, the vehicle of the eighth aspect of this disclosure includes the electronic equipment described in the above embodiments, or the power electronic device described in the above embodiments, or the contactor control circuit and / or the contactor described in the above embodiments.

[0055] According to embodiments of this disclosure, vehicles employing the electronic devices or power electronic devices described in the above embodiments, or the contactor control circuit and / or contactors described in the above embodiments, can achieve precise control of the contactor's operating state. Specifically, by acquiring the actual detection information of the contactor when it is in the engaged state, the current operating state of the contactor can be reflected. Based on this actual detection information, the control signal of the contactor can be precisely adjusted, thereby controlling the contactor's engaged state and realizing a closed-loop feedback control mechanism to ensure the contactor is in the desired engaged pressure state. In this way, this disclosure achieves precise adjustment of the contactor's operating state, avoiding instability problems such as excessive or insufficient current, improving the contactor's operational stability and reliability, and thus enhancing the overall safety and reliability of the vehicle.

[0056] Additional aspects and advantages of this disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this disclosure. Attached Figure Description

[0057] The above and / or additional aspects and advantages of this disclosure will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0058] Figure 1 is a flowchart of a contactor control method according to an embodiment of the present disclosure;

[0059] Figure 2 is a schematic diagram of a contactor coil current detection and feedback adjustment mechanism according to an embodiment of the present disclosure;

[0060] Figure 3 is a timing diagram of a pulse width modulation signal according to an embodiment of the present disclosure;

[0061] Figure 4 is a block diagram of an electronic device according to an embodiment of the present disclosure;

[0062] Figure 5 is a schematic diagram of a contactor control circuit according to an embodiment of the present disclosure;

[0063] Figure 6 is a partial structural schematic diagram of a contactor according to an embodiment of the present disclosure;

[0064] Figure 7 is a schematic diagram of a contactor coil pressure detection and feedback adjustment mechanism according to an embodiment of the present disclosure;

[0065] Figure 8 is a block diagram of a power electronic device according to an embodiment of the present disclosure;

[0066] Figure 9 is a block diagram of a power electronic device according to yet another embodiment of the present disclosure;

[0067] Figure 10 is a block diagram of a power electronic device according to another embodiment of the present disclosure;

[0068] Figure 11 is a block diagram of a vehicle according to an embodiment of the present disclosure;

[0069] Figure 12 is a block diagram of a vehicle according to yet another embodiment of the present disclosure;

[0070] Figure 13 is a block diagram of a vehicle according to yet another embodiment of the present disclosure;

[0071] Figure 14 is a block diagram of a vehicle according to another embodiment of the present disclosure;

[0072] Figure 15 is a block diagram of a vehicle according to another embodiment of the present disclosure.

[0073] Reference numerals: Vehicle 100; Power electronic device 1; Contactor control circuit 11; Contactor 12; Switching circuit 111; Protection unit 112; Contactor coil 121; Stationary contact 122; Moving contact 123; Pressure sensor 124; Controller 125; Switching transistor 1111; Current limiting unit 1112; Reference voltage unit 1113; Diode 1121; Resistor 1122; Electronic device 200; Processor 201; Memory 202. Detailed Implementation

[0074] The embodiments of this disclosure are described in detail below, and the embodiments described with reference to the accompanying drawings are exemplary.

[0075] The contactor control method according to an embodiment of the present disclosure is described below with reference to FIG1.

[0076] Figure 1 is a flowchart of a contactor control method according to an embodiment of the present disclosure. As shown in Figure 1, the contactor control method of the present disclosure embodiment includes at least steps S1-S2.

[0077] S1: When the contactor is in the engaged state, acquire the actual detection information of the contactor.

[0078] In some embodiments, the actual detection information of the contactor mainly reflects various physical parameters when the contactor is in the engaged state. For example, the actual detection information may be current information, voltage information, temperature information, pressure information, etc. This detection information can be acquired in real time through different sensors or detection devices (such as current detection devices, voltage sensors, temperature sensors, pressure sensors, etc.) to provide real-time feedback on the current operating state of the contactor. Through the real-time feedback of this information, a basis can be provided for subsequent control signal adjustments, ensuring that the contactor is always in a normal and safe operating state.

[0079] S2, adjust the current value of the contactor coil according to the actual detection information so that the actual detection information is within the expected range.

[0080] Among them, the actual detection information being within the expected value range can mean that the actual detection information is within the expected value, or that the deviation between the actual detection information and the expected value is within the deviation tolerance range, that is, the deviation has little impact on the contactor's engagement state and can be ignored. Furthermore, when the deviation is zero, the actual detection information is within the expected value.

[0081] In the embodiment, the desired value can be the value corresponding to the actual detection information when the moving and stationary contacts of the contactor are in the desired closed state, such as the current detection value or the closing pressure value.

[0082] Specifically, the current value of the contactor coil is adjusted based on actual test information. The magnitude of the current value of the contactor coil affects the engagement state of the contactor's moving and stationary contacts. By adjusting the current value of the contactor coil, the engagement state of the contactor can be dynamically optimized.

[0083] For example, if analysis of actual detection information indicates that the contactor is not fully engaged, the contactor coil current can be adjusted to ensure a sufficiently strong engagement force. Conversely, if the engagement force is too high or the coil temperature is too high, the contactor coil current can be adjusted to avoid energy waste. Therefore, this closed-loop feedback control mechanism can dynamically adjust the contactor's operating state based on real-time detection information, effectively preventing instability caused by sudden factors (such as power fluctuations or load changes), thereby improving the reliability of contactor operation.

[0084] According to the contactor control method of this disclosure, by acquiring the actual detection information of the contactor when it is in the energized state, the current operating state of the contactor can be reflected. Based on this actual detection information, the control signal of the contactor coil can be precisely adjusted, thereby controlling the energized state of the contactor. This achieves a closed-loop feedback control mechanism, ensuring that the actual detection information of the contactor is within the desired range. In this way, this disclosure achieves precise adjustment of the contactor's operating state, avoiding instability problems such as excessive or insufficient current, improving the operational stability and reliability of the contactor, and thus enhancing the safety and reliability of the entire electrical system.

[0085] In some embodiments, the actual detection information includes the actual detected current value of the contactor coil. The actual detected current value can refer to the real-time current flowing through the contactor coil when the contactor is in the engaged state. This current value can be obtained by measuring current detection devices, such as Hall effect current sensors and resistive shunts. These devices can provide high-precision current data for real-time feedback control.

[0086] Specifically, by using a current detection device to monitor the actual operating current of the contactor coil in the engaged state in real time, important information reflecting the current state of the contactor can be obtained. For example, the actual detected current value can be used to determine whether the coil's operating state is normal, such as excessive current (which may lead to overheating) or insufficient current (which may lead to inadequate engagement).

[0087] In some embodiments, adjusting the current value of the contactor coil based on actual detection information includes: determining a target control signal to maintain contactor engagement based on the actual detected current value and the control current value of the contactor coil, so as to adjust the current value of the contactor coil. The control current value of the contactor coil may refer to a target current value predefined based on the operating state of the contactor and external environmental conditions.

[0088] Specifically, by comparing the actual detected current value with the control current value of the contactor coil, it can be determined whether the current operating state of the contactor coil deviates from the target state, thereby determining the target control signal to maintain the contactor's engagement. The target control signal can adjust the contactor's engagement state, thereby improving the contactor's operational stability and reliability.

[0089] In some embodiments, determining a target control signal to maintain contactor engagement based on the actual detected current value and the control current value of the contactor coil includes: determining a target duty cycle of a pulse modulation signal to maintain contactor engagement based on the relative magnitudes of the actual detected current value and the control current value of the contactor coil.

[0090] In some embodiments, the pulse modulation signal is a periodic square wave signal. The pulse modulation signal can be generated in various ways, such as digital signal processors (DSPs), microcontrollers (MCUs), dedicated PWM generation circuits, field programmable gate arrays (FPGAs), analog circuits, etc.

[0091] Among these, DSPs generate precise PWM signals with accurate duty cycles through high-speed calculations based on real-time feedback signals (such as coil current and temperature), suitable for scenarios requiring complex control algorithms. MCUs generate PWM signals through their built-in timer modules, providing a flexible and economical solution suitable for systems of medium to low complexity. Dedicated PWM generation circuits use specially designed PWM chips to generate signals, reducing the burden on the main control unit and suitable for simple systems or scenarios with high reliability requirements. FPGAs, with their high parallel processing capabilities, can simultaneously generate multiple high-precision PWM signals in complex control systems. In specific applications, PWM signals can be directly generated using analog circuits such as comparators and operational amplifiers, suitable for low-cost and simple systems. The specific choice depends on the application requirements and system design.

[0092] In some embodiments, the duty cycle can refer to the proportion of the high-level duration in a PWM signal relative to the entire signal cycle. By determining the target duty cycle of the contactor's pulse modulation signal, the energizing time of the contactor coil can be controlled, thereby precisely adjusting the current flowing through the contactor coil. This approach achieves dynamic optimization of the contactor's operating state, improving the stability and reliability of the contactor's engaged state.

[0093] In some embodiments, by comparing the relative magnitudes of the actual detected current value and the control current value of the contactor coil, the system can adjust the duty cycle of the PWM signal based on the difference between the two. By precisely adjusting the duty cycle, the actual detected current value of the contactor coil is made consistent with the control current value of the contactor coil, or the difference between the two is within the allowable error range, i.e., the actual detected current value is within the expected value range, thereby ensuring that the actual detected current value of the contactor coil can meet the current requirements for the contactor to be in a stable engaged state.

[0094] In some embodiments, determining the target duty cycle of the pulse modulation signal for maintaining contactor engagement based on the magnitude of the actual detected current value and the control current value of the contactor coil includes: when the actual detected current value is greater than the control current value, the target duty cycle is the current duty cycle of the pulse modulation signal reduced by a preset duty cycle adjustment step size; or, when the actual detected current value is less than the control current value, the target duty cycle is the current duty cycle of the pulse modulation signal increased by a preset duty cycle adjustment step size; or, when the actual detected current value is equal to the control current value, the target duty cycle is the current duty cycle of the pulse modulation signal.

[0095] Specifically, in some embodiments, as shown in Figure 2, the control current value of the contactor coil is calculated based on at least one of the following factors: the actual operating state of the contactor, the resistance characteristics of the coil, the current operating temperature, and the load size. Then, the actual detected current value of the contactor coil is measured in real time using a current detection device. The actual detected current value of the contactor coil is compared with the control current value of the contactor coil to determine the target duty cycle of the contactor's pulse modulation signal.

[0096] Furthermore, when the actual detected current value of the contactor coil is greater than the control current value, it means that the actual detected current value in the contactor coil is too large, which may lead to coil heating and increased energy consumption. Therefore, it is necessary to reduce the current. The reduced duty cycle is obtained as the target duty cycle by decreasing the current duty cycle of the pulse modulation signal by a preset duty cycle adjustment step size. The preset step size determines that the duty cycle adjustment range can be a fixed value or dynamically adjusted according to the difference between the actual detected current value and the control current value. For example, when the difference between the actual detected current value and the control current value is large, a larger adjustment step size can be used to accelerate the current adjustment; while when the difference is small, the step size can be reduced to ensure fine adjustment. The reduced duty cycle will reduce the current value flowing through the contactor coil, making the actual detected current value of the contactor coil consistent with the control current value of the contactor coil, or ensuring that the difference between the two is within the allowable error range. This ensures that the actual detected current value of the contactor coil can meet the current requirements for the contactor to be in a stable engaged state.

[0097] Alternatively, if the actual detected current value of the contactor coil is less than the control current value, it means the actual detected current value in the contactor coil is too small, which may lead to contactor failure to engage or insufficient electromagnetic attraction. Therefore, it is necessary to increase the current. This is achieved by increasing the current duty cycle of the pulse modulation signal by a preset duty cycle adjustment step size, thus obtaining the increased duty cycle as the target duty cycle. The increased duty cycle will increase the current flowing through the coil, ensuring that the actual detected current value of the contactor coil matches the control current value, or that the difference between the two is within the allowable error range. This ensures that the actual detected current value of the contactor coil meets the current requirements for the contactor to be in a stable engaged state, allowing the contactor to be in the desired engaged state.

[0098] Alternatively, when the actual detected current value of the contactor coil is equal to the control current value of the contactor coil, the target duty cycle is the current duty cycle of the pulse modulation signal, that is, there is no need to adjust the current duty cycle of the pulse modulation signal, and the contactor remains in the ideal engaged state.

[0099] Therefore, by using the actual detected current value of the contactor coil to provide real-time feedback and adjust the target duty cycle, the actual detected current value of the contactor coil is consistent with the control current value of the contactor coil, or the difference between the two is within the allowable error range, thereby improving the reliability of the contactor in maintaining the engaged state.

[0100] In some embodiments, the actual detection information includes the actual contactor engagement pressure value. The actual engagement pressure is the engagement pressure value between the stationary contact and the moving contact of the contactor. This engagement pressure value can be directly measured by a pressure sensor (e.g., a force sensor or strain gauge) installed between the stationary and moving contacts of the contactor.

[0101] In some embodiments, the pressure sensor may be fixed to the back of the stationary contact or to the base supporting the stationary contact, or the pressure sensor may be embedded in the support arm of the moving contact or installed in the mechanical structure connecting the moving contact.

[0102] In some embodiments, adjusting the current value of the contactor coil based on actual detection information includes: determining a target control signal to maintain contactor engagement based on actual engagement pressure, so as to adjust the current value of the contactor coil.

[0103] Specifically, the contactor's energized state signifies that electrical contact has been established between the stationary and moving contacts. The actual energizing pressure directly affects the contactor's current carrying capacity, contact stability, durability, and power loss. Excessive energizing pressure can lead to excessive contact force, causing contact wear; insufficient pressure can result in unstable contact or poor electrical contact, affecting the contactor's reliability. Therefore, to ensure the contactor's operational stability and the quality of electrical contact, the actual energizing pressure becomes a crucial control factor in the energized state. By real-time monitoring of the actual energizing pressure, it's possible to determine whether the current energizing state of the contactor coil deviates from the target state, thereby determining the target control signal to maintain contactor energization. This target control signal adjusts the contactor's energizing state, maintaining the contact between the stationary and moving contacts within an ideal energizing pressure range, thus ensuring the stability and reliability of the contactor's energized state.

[0104] In some embodiments, determining a target control signal to maintain contactor engagement based on the actual engagement pressure value includes: determining a target control signal to maintain contactor engagement based on the actual engagement pressure value and the desired engagement pressure value of the contactor.

[0105] The desired pull-in pressure of the contactor can be a preset ideal value based on at least one factor in the contactor's design specifications, load conditions, and operating environment. By analyzing the pressure deviation between the actual pull-in pressure and the desired pull-in pressure, the deviation between the current pull-in state of the contactor coil and the target state can be quantified, thereby determining the target control signal for the contactor. The target control signal can adjust the contactor's pull-in state so that the actual pull-in pressure matches the desired pull-in pressure, or that the pressure deviation is within the allowable error range, thus ensuring the stability and reliability of the contactor's pull-in state.

[0106] In some embodiments, determining a target control signal to maintain contactor engagement based on the actual engagement pressure value and the desired engagement pressure value of the contactor includes: determining a target duty cycle of a pulse adjustment signal to maintain contactor engagement based on the relative magnitudes of the actual engagement pressure value and the desired engagement pressure value.

[0107] Specifically, by comparing the actual pull-in pressure value with the desired pull-in pressure value, the deviation between the actual pull-in pressure value and the desired pull-in pressure value can be obtained. Based on the deviation value, the target duty cycle of the pulse adjustment signal to maintain the contactor pull-in is determined. By adjusting the duty cycle of the current pulse adjustment signal to the target duty cycle, the actual pull-in pressure value and the desired pull-in pressure value can be gradually made consistent, thereby realizing a closed-loop feedback control mechanism to keep the contactor in the desired pull-in pressure state.

[0108] In some embodiments, when there is a certain pressure deviation between the actual pull-in pressure value and the desired pull-in pressure value, it has little impact on the contactor's pull-in stability and the pressure deviation can be ignored. Based on this consideration, a pressure deviation tolerance range can be set. For example, a pull-in pressure threshold can be set. When the pressure deviation between the actual pull-in pressure value and the desired pull-in pressure value exceeds the pull-in pressure threshold, the control signal for maintaining contactor pull-in is adjusted.

[0109] In some embodiments, the pull-in pressure threshold can be a set upper or lower limit value for the deviation of the actual pull-in pressure value from the expected pull-in pressure value, representing the maximum acceptable deviation of the actual pull-in pressure value from the expected pull-in pressure value. When the pressure deviation exceeds the pull-in pressure threshold, the duty cycle of the pulse regulation signal maintaining the contactor is adjusted according to the direction of the pressure deviation. By precisely adjusting the duty cycle, the actual pull-in pressure value of the contactor is made consistent with the expected pull-in pressure value of the contactor, or the pressure deviation between the two is within the allowable error range, thereby ensuring the stability and reliability of the contactor's pull-in state.

[0110] For example, when the pressure deviation exceeds the pull-in pressure threshold and the actual pull-in pressure of the contactor is low, it indicates that the coil current is insufficient, the contactor may not be fully engaged, or the contact may be unstable. In this case, by increasing the duty cycle of the pulse regulation signal, the coil current can be increased, which can raise the actual pull-in pressure value of the contactor until the pressure deviation between the actual pull-in pressure value and the desired pull-in pressure value is less than the pull-in pressure threshold, ensuring stable operation of the contactor.

[0111] Conversely, when the pressure deviation exceeds the pull-in pressure threshold and the actual pull-in pressure of the contactor is too high, it indicates that the coil current is too large, which may lead to increased contactor losses, or even overheating and contact point damage. In this case, by reducing the duty cycle of the pulse regulation signal, the coil current is reduced, thereby lowering the actual pull-in pressure of the contactor until the pressure deviation between the actual pull-in pressure and the desired pull-in pressure is less than the pull-in pressure threshold, thus preventing contactor damage.

[0112] Furthermore, the pull-in pressure threshold can be set according to specific needs. It's important to note that the pull-in pressure threshold should not be too high or too low. If the threshold is too low, the system may become overly sensitive to small pressure fluctuations, frequently triggering adjustment controls and increasing system energy consumption and wear. If the threshold is too high, the system's tolerance for pressure deviations increases, potentially preventing timely adjustment of the actual pull-in pressure value and affecting the contactor's pull-in reliability.

[0113] In some embodiments, determining the target duty cycle of the pulse modulation signal for maintaining contactor engagement based on the relative magnitudes of the actual engagement pressure value and the desired engagement pressure value includes: when the actual engagement pressure value is greater than the desired engagement pressure value, the target duty cycle is the duty cycle of the current duty cycle of the pulse modulation signal reduced by a preset duty cycle adjustment step size; or, when the actual engagement pressure value is less than the desired engagement pressure value, the target duty cycle is the duty cycle of the current duty cycle of the pulse modulation signal increased by a preset duty cycle adjustment step size; or, when the actual engagement pressure value is equal to the desired engagement pressure value, the target duty cycle is the current duty cycle of the pulse modulation signal.

[0114] Specifically, the desired pull-in pressure of the contactor is preset and calibrated based on at least one factor in the contactor's design specifications, load conditions, and operating environment. Then, a pressure sensor is used to measure the pull-in pressure value between the stationary and moving contacts of the contactor in real time, i.e., the actual pull-in pressure value of the contactor. The actual pull-in pressure value is compared with the desired pull-in pressure value. When the pressure deviation between the actual pull-in pressure value and the desired pull-in pressure value exceeds the pull-in pressure threshold, the target duty cycle of the pulse width modulation signal is determined.

[0115] Furthermore, when the actual pull-in pressure exceeds the desired pull-in pressure, it indicates that the contactor's actual pull-in pressure is too high. This can lead to increased contact wear, contactor overheating, increased power loss, and even contactor damage. To reduce the actual pull-in pressure, the current duty cycle of the pulse modulation signal is reduced by a preset duty cycle adjustment step, resulting in a reduced duty cycle as the target duty cycle. The reduced duty cycle decreases the current flowing through the contactor coil, weakening the coil's electromagnetic force. This ensures that the actual pull-in pressure matches the desired pull-in pressure, or that the pressure deviation is within acceptable error limits, thereby ensuring the stability and reliability of the contactor's pull-in state.

[0116] Alternatively, when the actual pull-in pressure is less than the desired pull-in pressure, it indicates insufficient actual pull-in pressure, which may lead to incomplete contact, unstable contact, or poor electrical contact. To increase the actual pull-in pressure, the current duty cycle of the pulse modulation signal is increased by a preset duty cycle adjustment step, resulting in an increased duty cycle as the target duty cycle. The increased duty cycle increases the current flowing through the coil, increasing the electromagnetic force of the coil, ensuring that the actual pull-in pressure matches the desired pull-in pressure, or that the pressure deviation is within the allowable error range, thus ensuring the stability and reliability of the contactor's pull-in state.

[0117] Alternatively, when the actual engagement pressure value equals the desired engagement pressure value, the target duty cycle is the current duty cycle of the pulse modulation signal, meaning there is no need to adjust the current duty cycle of the pulse modulation signal, and the contactor remains in the desired engagement state.

[0118] Therefore, by continuously receiving feedback information from the pressure sensor, the system dynamically adjusts the target duty cycle of the pulse modulation signal based on the difference between the actual and desired contactor engagement pressure. Through this closed-loop control method, the system can proactively adjust the contactor's engagement state, ensuring that the actual engagement pressure matches the desired pressure, or that the pressure deviation is within acceptable error limits. This prevents excessively high or low actual engagement pressure from affecting the contactor's performance and lifespan.

[0119] In some embodiments, the contactor control method further includes: in response to a contactor energizing trigger signal, generating an energizing control signal based on the required energizing control current of the contactor coil, and controlling the switching state of a switching circuit for controlling the energizing state of the contactor coil based on the energizing control signal, so that the contactor is energized.

[0120] Specifically, when the system detects the need to activate the contactor, it sends a contactor engagement trigger signal. This signal can be issued by an external control system (such as a battery management system or main control unit), indicating that the contactor should begin to engage. The required engagement control current for the contactor coil is a key parameter determining whether the contactor can engage successfully. When generating the engagement control signal, the system can calculate the required engagement control current for the contactor coil based on at least one of the following factors: contactor specifications (such as the coil's rated current, voltage, and resistance characteristics), current operating temperature, and load size, to ensure that the contactor engages at the appropriate current.

[0121] Furthermore, the switching state of a switching circuit used to control the energization state of the contactor coil is controlled according to the pull-in control signal. This switching circuit may include power semiconductor devices (such as MOSFETs, IGBTs, or other suitable switching elements). During the control process, the periodic variation of the pulse modulation signal is used to adjust the switching state of the power semiconductor device. When the pulse modulation signal is high, the power semiconductor device is turned on, current flows through the contactor coil, generating an electromagnetic effect to trigger the contactor to engage. When the pulse modulation signal is low, the power semiconductor device is turned off, the contactor coil current is interrupted, and the contactor returns to the open state. By alternating high and low levels of the pulse modulation signal within a certain period, the power semiconductor device is repeatedly turned on and off within a certain time interval, thereby achieving dynamic adjustment of the current through the contactor coil. This ensures that the current through the contactor coil meets the required pull-in control current, thus ensuring the stability and reliability of the contactor's engagement state.

[0122] In some embodiments, controlling the switching state of a switching circuit used to control the energization state of a contactor coil according to a pull-in control signal includes: controlling the switching time of the switching circuit according to the pull-in control signal. The switching time can refer to the duration for which the switching circuit remains on or off, i.e., the length of time required for the switching circuit to go from open to closed or from closed to open. Reasonably controlling the switching time of the switching circuit ensures that the contactor can engage stably and maintain good electrical contact, thereby improving the stability and reliability of the entire electrical system.

[0123] In some embodiments, the pull-in control signal can be a pulse modulation signal, and controlling the switching time of the switch according to the pull-in control signal includes: controlling the switching time of the switch circuit according to the duty cycle of the pulse modulation signal corresponding to the pull-in control signal.

[0124] Specifically, the duty cycle of the pulse modulation signal directly affects the switching time of the switching circuit. If the duty cycle of the pulse modulation signal is high, meaning the high-level duration of the pulse modulation signal is long, the conduction time of the switching circuit is also long. In this case, the switching circuit can allow current to flow through the contactor coil for a longer period of time, thereby generating a continuous electromagnetic force and promoting the contactor's engagement. Conversely, if the duty cycle of the pulse modulation signal is low, meaning the high-level duration of the signal is short, the conduction time of the switching circuit is short, and the current carried by the contactor coil will also decrease. This may lead to a weaker contactor engagement, or even incomplete or unstable engagement. Therefore, by dynamically adjusting the duty cycle of the pulse modulation signal, the contactor's engagement state can be precisely controlled.

[0125] In some embodiments, the pull-in control current is a crucial factor in enabling the contactor to pull in. The system generates a pulse adjustment signal based on the required pull-in control current. When the contactor begins to pull in, the duty cycle of the pulse adjustment signal generated by the system is relatively large. This is because a larger duty cycle provides a longer current supply, making the contactor's pull-in process faster and achieving the pull-in action more effectively. By adjusting the current during the initial pull-in phase with a duty cycle greater than that during the pull-in state, the contactor's pull-in action can be completed quickly. When the contactor is in the pull-in state, the duty cycle will decrease because only an appropriate current is needed to maintain the pull-in state. If the duty cycle is too large, excessive current may flow through the contactor coil, resulting in unnecessary power consumption or heat generation.

[0126] In some embodiments, the amplitude of the pulse adjustment signal corresponding to the pull-in control signal generated based on the pull-in control current is greater than the amplitude of the pulse adjustment signal when the contactor is in the pull-in state. Specifically, the amplitude of the pulse adjustment signal represents the magnitude of the current, which directly affects the magnetic field strength of the contactor coil, thereby affecting the contactor's pull-in capability. If the current intensity is insufficient when the contactor is pull-in, it may not be able to pull in firmly or incompletely. Therefore, during the control process of the contactor's pull-in action, a larger amplitude of the pulse adjustment signal is required to ensure that the contactor is fully pulled in and reaches the ideal pull-in state. When the contactor is successfully pulled in and in a stable state, the system can adjust the amplitude of the pulse adjustment signal to keep it at a smaller amplitude. This is because, in the pull-in state, the contactor is already stable, and only an appropriate current is needed to maintain the pull-in state, avoiding unnecessary energy consumption and overheating.

[0127] In some embodiments, the contactor control method further includes: in response to a de-energizing signal of the contactor coil, after a preset time delay, stopping the transmission of control signals to the switching circuit used to control the energizing state of the contactor coil.

[0128] Specifically, the de-energization signal of the contactor coil means that the control system needs to disconnect the electromagnetic engagement state of the contactor, that is, cut off the power supply signal to the contactor. This de-energization signal can be triggered by normal system shutdown operation, fault detection, user operation request, or other safety protection measures. When the de-energization signal of the contactor coil is triggered, the system can make appropriate adjustments to the contactor's control signal to ensure a smooth transition of the contactor from the engaged state to the disengaged state.

[0129] Furthermore, upon receiving the de-energization signal from the contactor coil, the system first disconnects the contactor's power supply. At this point, the system does not immediately stop sending control signals to the switching circuit connected to the contactor coil; instead, it delays for a first preset time. This time period can be called the "buffer time." This "buffer time" is used to prevent system instability caused by prematurely shutting off the control signal. Specifically, when the contactor's power supply is disconnected, the contactor coil generates an induced electromotive force (self-inductance) due to changes in its own current, which may lead to high-voltage spikes or electromagnetic interference. By delaying for the first preset time, the system can effectively absorb the induced current in the coil using the surge protection circuit, preventing transient voltages from interfering with or damaging other circuits.

[0130] In some embodiments, the preset time can be set based on the contactor's operating characteristics, load conditions, and other system requirements. For example, the preset time can be 100ms or 200ms or other suitable times to ensure that the induced current can be sufficiently attenuated after the coil power supply is cut off, so as to avoid the transient voltage from affecting the circuit.

[0131] Furthermore, after a preset time has elapsed, the system stops sending control signals to the switching circuit, meaning that the switching circuit's conducting state has been deactivated. Therefore, this delay control mechanism can effectively improve the stability and reliability of the contactor's de-energizing process.

[0132] In some embodiments, the contactor control method further includes: determining the circuit connection state of the contactor coil and the switching circuit before generating a pull-in control signal according to the pull-in control current required by the contactor coil of the contactor, thereby effectively avoiding faults such as loose wiring, open circuit or short circuit caused by circuit connection problems, and ensuring the safe and reliable operation of the contactor.

[0133] In some embodiments, the circuit connection status of the contactor coil and the switching circuit can be determined by detection methods such as current, voltage, or resistance. For voltage detection, the connection between the contactor coil and the switching circuit can be determined by detecting the voltage across the contactor coil. If the voltage across the contactor coil is within a predetermined range, the connection between the contactor coil and the switching circuit is valid. If the voltage is abnormal (e.g., zero or much higher than expected), there is a problem with the circuit connection. For current detection, the presence of effective current flow can be determined by detecting the current in the contactor coil. If the current value in the contactor coil is normal, the connection between the contactor coil and the switching circuit is good. If there is no current flow, it may indicate an interruption or fault in the connection between the contactor coil and the switching circuit. For resistance detection, the circuit connection status can be determined by detecting the resistance value between the contactor coil and the switching circuit. If the resistance value is abnormal (e.g., too high or too low), there may be a problem with the circuit connection, possibly an open circuit or a short circuit.

[0134] In some embodiments, determining the circuit connection state of the contactor coil and the switching circuit includes: when the target state of the contactor coil and the switching circuit is met, if the detection signal of the target detection point satisfies the condition that the switching circuit is connected normally, then it is determined that the circuit connection of the contactor coil and the switching circuit is normal.

[0135] In some embodiments, the target detection point is a key point for determining the circuit connection status, and its specific location can be flexibly selected according to circuit design requirements. The target detection point can be selected as the node where the switching circuit is connected to ground. For example, if the switching circuit is connected to ground through a MOSFET (such as an N-type MOSFET), the target detection point can be set at the source of the MOSFET. In this case, the detection signal of the target detection point can be a voltage signal.

[0136] In addition, the target detection point can also be selected as the power supply terminal of the contactor coil, the control terminal of the switching circuit, the middle position of the contactor coil, etc., without specific restrictions.

[0137] In some embodiments, when the contactor coil and the switching circuit are in the target state, the conditions for normal connection of the switching circuit include: when the contactor coil is not energized and the switching circuit is in the open state, the detection signal of the target detection point is low; when the contactor coil is energized and the switching circuit is in the open state, the detection signal of the target detection point is high; and when the contactor coil is energized and the switching circuit is in a conducting state for a preset time, the detection signal of the target detection point is low.

[0138] Figure 3 is a timing diagram of a pulse width modulation signal according to an embodiment of the present disclosure. As shown in Figure 3, (a) depicts the output signal of the high-side control and output pin (reflecting whether the contactor coil is energized), (b) depicts the PWM level signal of the low-side control (reflecting the on / off state of the switching circuit), (c) depicts the output signal of the low-side control output pin, and (d) depicts the detection signal of the target detection point, i.e., the actual level signal of the source of the low-side power semiconductor device detected by the control pin. The high side can refer to the side connected to the positive power supply (VCC). The low side can refer to the side connected to ground (GND).

[0139] In some embodiments, at time t1, neither the high side nor the low side is activated; the contactor coil is not energized, and the switching circuit is in the open state. That is, the output signal of the high side control and output pin and the PWM level signal of the low side control are both low. The detection signal of the target detection point is low. If the detection signal is high, there may be a risk of a short circuit to the power supply from the low side.

[0140] In some embodiments, at time t2, the high side is turned on, the contactor coil is energized, that is, the output signal of the high side control and output pin is high level, the low side is not turned on, the switching circuit is in the off state, that is, the PWM level signal of the low side control is low level and lasts for a period of time, such as 100ms. During this 100ms process, the detection signal of the target detection point is high level. If the detection signal is low level, there may be a risk of open circuit or low side short circuit.

[0141] It should be noted that 100ms is not a limiting parameter of this disclosure, but rather an optimal value selected based on the actual needs and design objectives of the contactor control system. Depending on the specific application scenario, the high-side turn-on duration can be adjusted, for example, to 50ms, 80ms, or 150ms, all of which are reasonable embodiments.

[0142] The selection of 100ms is primarily based on the following design considerations: the response time of the contactor coil, the dynamic characteristics of the detection circuit, and the reliability requirements of fault diagnosis. Furthermore, experiments have shown that the 100ms parameter value achieves a good balance between fault detection accuracy and system response speed; experimental data indicates a fault detection success rate exceeding 98%. In addition, the 100ms value aligns with the design parameter range of relevant industries (e.g., 50ms to 200ms), demonstrating good applicability and compatibility.

[0143] In some embodiments, at time t3, the low side remains on, and the switching circuit is in a conducting state for a preset time, which can be 2s. During these 2s, the detection signal of the target detection point is low. If the detection signal is high, it is considered that the low side control has failed or the low side is short-circuited to the power supply.

[0144] It should be noted that 2 seconds is not a limiting parameter of this disclosure, but rather an optimal value selected based on the actual needs and design objectives of the contactor control system. Depending on the specific application scenario, the duration of the low-side continuous operation can be adjusted, for example, 1 second, 1.5 seconds, or 3 seconds, all of which are reasonable embodiments.

[0145] The selection of 2 seconds is primarily based on the following design considerations: the dynamic requirements of the low-side control circuit, the stability requirements of fault detection, and the reliability requirements of the detection signal. It also avoids misjudgments due to excessively short detection times or response delays due to excessively long times. Experiments showed that the 2-second parameter value achieves a good balance between fault detection accuracy and system response speed, with experimental data demonstrating a 99% detection success rate. Furthermore, the 2-second value aligns with commonly used parameter ranges in the industry (e.g., 1 to 5 seconds), demonstrating strong practical application value.

[0146] In some embodiments, at time t4, the high side remains continuously on, and the contactor coil remains continuously energized. That is, the output signal of the high-side control and output pin is at a high level, and the PWM level signal of the low-side control alternates between high and low levels. During this period, a control signal can be generated according to the required pull-in control current of the contactor coil. By adjusting the duty cycle of the pulse modulation signal, the switching time of the switching circuit can be controlled, thereby enabling precise control of the contactor's pull-in state.

[0147] In some embodiments, at time t5, the high side is turned off first, the contactor coil is disconnected from the energized state first, and the low side is turned off after a first preset time (such as 100ms or 200ms or other suitable time), so as to ensure that the induced current can be sufficiently attenuated after the power supply to the contactor coil is cut off, and to avoid the transient voltage from affecting the circuit.

[0148] In some embodiments, at time t6, the contactor coil is not energized and the switching circuit is in the open state. The output signal of the high-side control and output pin and the PWM level signal of the low-side control are both low, and the circuit enters the unenergized state.

[0149] An electronic device 200 according to an embodiment of the present disclosure is described below with reference to FIG4.

[0150] Figure 4 is a block diagram of an electronic device 200 according to an embodiment of the present disclosure. As shown in Figure 4, the electronic device 200 includes: at least one processor 201 and a memory 202 communicatively connected to at least one processor 201.

[0151] In some embodiments, at least one processor 201 can be one processor 201, or multiple processors 201, such as two processors 201, three processors 201, five processors 201, etc. The processor 201 is the core computing unit in the electronic device 200, responsible for executing the computer program stored in the memory 202. The performance of the processor 201 (such as clock frequency, number of cores, etc.) directly affects the response speed and accuracy of the control method. The processor 201 can be a central processing unit (CPU), a digital signal processor (DSP), or other dedicated processors, such as a field-programmable gate array (FPGA), depending on the complexity of the electronic device 200, the control accuracy requirements, and power consumption limitations.

[0152] In some embodiments, memory 202 can be used to store computer programs and other necessary data. Memory 202 can include various types, such as random access memory (RAM), read-only memory (ROM), flash memory, etc.

[0153] In some embodiments, the memory 202 stores a computer program that can be executed by at least one processor 201, which executes the computer program to implement the contactor control method described in the above embodiments.

[0154] According to the electronic device 200 of this disclosure, at least one processor 201 executes a computer program that implements the contactor control method described in the above embodiments. Specifically, by acquiring actual detection information of the contactor when it is in the engaged state, the current operating state of the contactor can be reflected. Based on this actual detection information, the control signal of the contactor can be precisely adjusted, thereby controlling the engaged state of the contactor and realizing a closed-loop feedback control mechanism to ensure the contactor is in the desired engaged pressure state. In this way, this disclosure achieves precise adjustment of the contactor's operating state, avoiding instability problems such as excessive or insufficient current, improving the operational stability and reliability of the contactor, and thus enhancing the safety and reliability of the entire electrical system.

[0155] This disclosure also proposes a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the contactor control method described in the above embodiments. The specific implementation process of the contactor control method can be referred to the description in the above embodiments.

[0156] According to the computer-readable storage medium of this disclosure, by employing the contactor control method described in the above embodiments, that is, by acquiring the actual detection information of the contactor when it is in the energized state, the current operating state of the contactor can be reflected. Based on the actual detection information, the control signal of the contactor can be precisely adjusted, thereby controlling the energized state of the contactor and realizing a closed-loop feedback control mechanism to ensure the contactor is in the desired energizing pressure state. In this way, this disclosure achieves precise adjustment of the contactor's operating state, avoiding instability problems such as excessive or insufficient current, improving the operational stability and reliability of the contactor, and thus enhancing the safety and reliability of the entire electrical system.

[0157] This disclosure also proposes a computer program product that stores a computer program, which, when executed, implements the contactor control method described in the above embodiments.

[0158] According to the computer program product of this disclosure, by executing the computer program that implements the contactor control method described in the above embodiments, that is, by acquiring the actual detection information of the contactor when it is in the energized state, the current operating state of the contactor can be reflected. Based on the actual detection information, the control signal of the contactor can be precisely adjusted, thereby controlling the energized state of the contactor and realizing a closed-loop feedback control mechanism to keep the contactor in the desired energizing pressure state. In this way, this disclosure achieves precise adjustment of the contactor's operating state, avoiding instability problems such as excessive or insufficient current, improving the operating stability and reliability of the contactor, and thus enhancing the safety and reliability of the entire electrical system.

[0159] The contactor control circuit 11 according to an embodiment of the present disclosure is described below with reference to FIG5.

[0160] Figure 5 is a schematic diagram of a contactor control circuit 11 according to an embodiment of the present disclosure. As shown in Figure 5, the contactor control circuit 11 includes a switch circuit 111 and a controller 125.

[0161] In some embodiments, the first terminal of the switching circuit 111 is adapted to be connected to the first terminal of the contactor coil 121, and the second terminal of the switching circuit 111 is grounded. By controlling the switching time of the switching circuit 111 according to the duty cycle of the pulse modulation signal, the current flowing into the contactor coil 121 can be indirectly adjusted, thereby controlling the engaging or disengaging state of the contactor 12.

[0162] In some embodiments, the controller 125 may be a microcontroller (MCU), a digital signal processor (DSP), or other dedicated processor 201. The controller 125 is connected to the control terminal of the switching circuit 111 and is used to control the switching state of the switching circuit 111 according to the contactor control method described in the above embodiments. Specifically, the controller 125 can control the switching time of the switching circuit 111 according to the duty cycle of the pulse modulation signal to adjust the current of the contactor coil 121, thereby achieving precise control of the contactor 12's engaging state. The controller 125 can receive inputs including but not limited to sensor signals, fault signals, and switch status signals, and then decide whether to change the operating state of the contactor 12. For example, when a circuit fault or abnormality is detected, the controller 125 can stop sending control signals to ensure that the contactor 12 is safely disconnected, avoiding further damage to the circuit. Furthermore, the controller 125 can also execute delay logic (e.g., delaying the PWM signal shutdown) as needed to ensure that the induced current is sufficiently attenuated after the power supply to the contactor coil 121 is cut off, avoiding the impact of transient voltage on the circuit.

[0163] According to the contactor control circuit 11 of this disclosure, by connecting the switch circuit 111 to the first end of the contactor coil 121 and the controller 125 to the control terminal of the switch circuit 111, and controlling the switching state of the switch circuit 111 according to the contactor control method described in the above embodiment, the operating state of the contactor can be adjusted in real time. Specifically, by acquiring the actual detection information of the contactor when it is in the energized state, the current operating state of the contactor can be reflected. Through the actual detection information, the switching state of the switch circuit 111 can be precisely controlled, thereby controlling the energized state of the contactor. This realizes a closed-loop feedback control mechanism that uses actual detection information to adjust the control signal of the contactor, so that the contactor is in the desired energizing pressure state. In this way, this disclosure achieves precise adjustment of the contactor's operating state, avoids instability problems such as excessive or insufficient current, improves the operating stability and reliability of the contactor, and thus enhances the safety and reliability of the entire electrical system.

[0164] In some embodiments, as shown in FIG5, the switching circuit 111 includes a switching transistor 1111. The switching transistor 1111 can be, but is not limited to, semiconductor devices such as MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors) and IGBTs (Insulated Gate Bipolar Transistors). The specific type of switching transistor 1111 selected can be flexibly determined according to the design and application requirements.

[0165] In some embodiments, the first terminal of the switching transistor 1111 is adapted to be connected to the contactor coil 121, and the second terminal of the switching transistor 1111 is grounded. The function of the switching transistor 1111 is to regulate the operating state of the contactor coil 121 by controlling the conduction and cutoff of the current.

[0166] In some embodiments, as shown in FIG5, the switching circuit 111 further includes a current limiting unit 1112. The first end of the current limiting unit 1112 is connected to the control terminal of the switching transistor 1111, and the second end of the current limiting unit 1112 is connected to the controller 125, for limiting the current input to the control terminal of the switching transistor, thereby protecting the circuit and the switching transistor 1111 from damage.

[0167] In some embodiments, the current limiting unit 1112 may include, but is not limited to, a resistor 1122 or other components / circuits with current limiting functions. For example, by connecting a resistor 1122 with a suitable resistance value in series, the control current flowing through the switching transistor 1111 can be limited. Alternatively, an inductor or a current-limiting diode 1121 can be used to limit the current. Specifically, inductors have strong resistance to current changes and can effectively suppress sudden current fluctuations. By connecting an inductor in series, a more stable current output can be achieved, reducing the impact of current fluctuations during switching. Furthermore, in certain special cases, a current-limiting diode 1121 (such as a Zener diode 1121) can be used to automatically conduct when the current exceeds a preset range, thereby limiting the current and protecting the switching transistor 1111 and other sensitive components from damage.

[0168] In some embodiments, as shown in FIG5, the switching circuit 111 further includes a reference voltage unit 1113. A first terminal of the reference voltage unit 1113 is connected to the control terminal of the switching transistor 1111, and a second terminal of the reference voltage unit 1113 is grounded, used to provide a reference voltage for the switching transistor 1111, ensuring that the control terminal of the switching transistor 1111 can correctly respond to the control signal. With the stable voltage provided by the reference voltage unit 1113, the switching transistor 1111 can accurately perform on / off operations according to the control signal.

[0169] In some embodiments, as shown in FIG5, the contactor control circuit 11 further includes a protection unit 112. The main function of the protection unit 112 is to absorb and consume the surge signal generated by the self-inductance of the contactor coil 121 by forming a circuit when the contactor coil 121 is disconnected, thereby preventing the instantaneous voltage fluctuation generated when the contactor coil 121 is disconnected from damaging the circuit components.

[0170] Specifically, when the contactor coil 121 suddenly disconnects, due to the coil's self-inductance, the current flowing through the coil cannot instantly become zero. According to the principle of self-inductance, the rapid change in current will cause a back electromotive force to be generated across the coil, thus forming a voltage spike (i.e., surge voltage). This voltage peak may far exceed the withstand voltage capability of other components in the circuit, leading to damage to the circuit components. To avoid this situation, the protection unit 112 provides a closed current loop, effectively absorbing the surge signal, thereby preventing the surge voltage from damaging other circuit components and improving the safety and stability of the entire system.

[0171] In some embodiments, the first end of the protection unit 112 is adapted to be connected to the second end of the contactor coil 121 and the power supply, the second end of the protection unit 112 is adapted to be connected to the first end of the contactor coil 121, and the second end of the protection unit 112 is connected to the first end of the switching circuit 111, for forming a circuit with the contactor coil 121 to absorb surge signals at the moment the contactor coil 121 is de-energized.

[0172] As shown in Figure 5, the protection unit 112 includes a diode 1121 and a resistor 1122. The diode 1121 provides a fast current path through the conduction path, while the resistor 1122 limits the current magnitude to prevent excessive current from affecting other circuit components.

[0173] In some embodiments, the cathode of diode 1121 is adapted to be connected to the second terminal of contactor coil 121 and a power supply. The first terminal of resistor 1122 is connected to the anode of diode 1121, the second terminal of resistor 1122 is adapted to be connected to the first terminal of contactor coil 121, and the second terminal of resistor is connected to the first terminal of switching circuit 111.

[0174] In some embodiments, the contactor control circuit 11 further includes a current detection unit, which can be connected in series with the contactor coil to detect the actual current value of the contactor coil 121. The current detection unit is also connected to the controller 125 to send the actual current value to the controller 125.

[0175] In some embodiments, the current detection unit may include a current sensor, common current sensors including but not limited to: Hall effect sensors, shunt resistors, and zero-bias current transformers. These sensors detect the current value through the contactor coil 121 using different principles. The output signal of the current sensor may be an analog voltage signal, which is digitized after analog-to-digital conversion by the controller 125, or it may be a digital signal directly input to the controller 125 for processing.

[0176] In some embodiments, the controller 125 is also adapted to be connected to a pressure detection unit for detecting the actual engagement pressure value of the contactor, in order to obtain the actual engagement pressure of the contactor. Specifically, the main function of the pressure detection unit is to detect the pressure applied to the contactor during the contactor engagement process in real time. When the contactor engages, it generates a certain mechanical pressure to ensure good contact between the contacts, no gaps, and reliable current transmission. By monitoring this pressure, the pressure detection unit helps the controller 125 determine whether the contactor is engaging normally or whether the engagement pressure has reached a predetermined value.

[0177] In some embodiments, the pressure detection unit may include, but is not limited to, a pressure sensor, a pressure conversion module, a signal processing unit, and a communication interface. The pressure sensor is used to detect the actual engagement pressure value of the contactor. The pressure conversion module converts the analog signal generated by the pressure sensor into a digital signal and communicates with the controller 125. The signal processing unit can filter, correct, and adjust the sensor data to ensure the accuracy and stability of the signal. The output signal of the pressure detection unit can be transmitted to the controller 125 through the communication interface.

[0178] The contactor 12 according to an embodiment of the present disclosure is described below with reference to FIG6.

[0179] Figure 6 is a partial structural schematic diagram of a contactor 12 according to an embodiment of the present disclosure. As shown in Figure 6, the contactor 12 includes: a contactor coil 121, a stationary contact 122, a moving contact 123, and a pressure sensor 124.

[0180] In some embodiments, the contactor coil 121 is a key component of the contactor 12, and can be made of conductive wire to form an electromagnetic coil. Its main function is to generate a magnetic field to drive the mechanical movement of the contactor 12, controlling the contact state between the stationary contact 122 and the moving contact 123. The moving contact 123 and the contactor coil 121 can be fixedly connected, and both can be located on the same side. When current flows through the contactor coil 121, the generated magnetic field causes the contactor coil 121 and the moving contact 123 to move together, and the moving contact 123 contacts the stationary contact 122, thus forming a current path. When the current stops flowing through the coil, the magnetic field disappears, the moving contact 123 separates from the stationary contact 122, and the current path is broken.

[0181] In addition, the moving contact 123 and the contactor coil 121 can be located on different sides. The moving contact 123 can be connected to the contactor coil 121 by a spring, lever or other elastic structure. The contactor coil 121 guides the moving contact 123 to move toward the stationary contact 122 through a magnetic field, thereby completing the contact action.

[0182] In some embodiments, the stationary contact 122 is a fixed part of the contactor 12 and may be made of a high-temperature resistant and corrosion-resistant conductive material (such as copper or silver alloy). The function of the stationary contact 122 is to maintain the open circuit when the contactor 12 is in the open state, or to establish a current path together with the moving contact 123 when the contactor 12 is in the closed state.

[0183] As shown in Figure 6, the contactor 12 employs two stationary contacts 122. This double-stationary contact structure provides higher current carrying capacity and more stable electrical contact, making it suitable for applications requiring larger currents or higher reliability. In this structure, the two stationary contacts 122 are located on opposite sides of the moving contact. Driven by the contactor coil 121, the moving contact 123 can move along a predetermined path and contact the two stationary contacts 122 respectively. When the contactor 12 is energized, the moving contact 123 simultaneously establishes a current path with the two stationary contacts 122, thereby enabling current conduction.

[0184] It is important to note that the double stationary contact structure is not the only design approach. The number of stationary contacts 122 in the contactor 12 can be adjusted according to specific application requirements. For example, some contactors 12 may use only a single stationary contact, while in high-load applications, multiple stationary contacts 122 can be selected to share the current.

[0185] In some embodiments, the moving contact 123 is a movable part of the contactor 12, which can be connected to the contactor coil 121. The moving contact 123 can contact or disconnect with the stationary contact 122 by an attraction force (the magnetic field generated by the contactor coil 121). The moving contact 123 can be made of a conductive material (such as a silver alloy) to ensure high conductivity and wear resistance.

[0186] In some embodiments, the pressure sensor 124 is used to detect the actual engagement pressure value between the stationary contact 122 and the moving contact 123 in the engaged state. The pressure sensor 124 is adapted to be connected to the controller 125 in the contactor control circuit 11 of the above embodiment to send the actual engagement pressure value to the controller 125. The pressure sensor 124 may include, but is not limited to, strain gauge sensors, piezoelectric sensors, or capacitive sensors.

[0187] In some embodiments, the pressure sensor is located on the stationary contact and / or the moving contact. For example, the pressure sensor may be fixed to the back of the stationary contact or on a base supporting the stationary contact, or the pressure sensor may be embedded in the support arm of the moving contact or mounted in a mechanical structure connecting the moving contact. Alternatively, the pressure sensor may be mounted on both the moving and stationary contacts.

[0188] In some embodiments, the pressure sensor 124 may be disposed on the stationary contact 122 and / or the moving contact 123. For example, the pressure sensor 124 may be mounted on the back of the stationary contact 122 or fixed to a base supporting the stationary contact 122; alternatively, the pressure sensor 124 may be embedded in the support arm of the moving contact 123 or mounted on a mechanical structure connected to the moving contact 123. Furthermore, the pressure sensor 124 may be mounted on both the moving contact 123 and the stationary contact 122 simultaneously to achieve more comprehensive pressure detection.

[0189] In some embodiments, the pressure sensor 124 may also be disposed inside the stationary contact 122 without affecting conductivity. For example, the stationary contact 122 may accommodate the pressure sensor 124 through a hollow structure or a specially designed channel, thus ensuring that the sensor is located in an area not in direct contact with current. Alternatively, the stationary contact 122 may be designed as a closed space with an inner cavity or non-conductive material, in which the pressure sensor 124 is embedded.

[0190] Figure 7 is a schematic diagram of a contactor coil pressure detection and feedback adjustment mechanism according to an embodiment of the present disclosure. As shown in Figure 7, the pressure sensor 124 measures the actual engagement pressure between the two stationary contacts and the moving contact of the contactor 12 in real time, using this as the actual engagement pressure value of the contactor 12, and transmits the actual engagement pressure data to the controller 125. The controller 125 compares the actual engagement pressure with the desired engagement pressure to determine whether to adjust the duty cycle of the pulse width modulation signal.

[0191] When the actual pull-in pressure value is greater than the expected pull-in pressure value, and the pressure deviation between the actual pull-in pressure value and the expected pull-in pressure value of contactor 12 exceeds the pull-in pressure threshold, the current duty cycle of the pulse width modulation signal is reduced by a preset duty cycle adjustment step size to obtain a reduced duty cycle as the target duty cycle. The reduced duty cycle will shorten the conduction time of the switching circuit 111, thereby reducing the current flowing through the coil, weakening the electromagnetic force of the coil, and gradually bringing the actual pull-in pressure value between the stationary and moving contacts of contactor 12 closer to the expected pull-in pressure value of contactor 12.

[0192] Alternatively, when the actual pull-in pressure is less than the desired pull-in pressure, and the pressure deviation between the actual pull-in pressure and the desired pull-in pressure of contactor 12 exceeds the contact force pull-in pressure threshold, the current duty cycle of the pulse width modulation signal is increased by a preset duty cycle adjustment step size to obtain an increased duty cycle as the target duty cycle. The increased duty cycle prolongs the conduction time of the switching circuit 111, thereby increasing the current flowing through the coil, increasing the electromagnetic force of the coil, and causing the actual pull-in pressure between the stationary contact 122 and the moving contact 123 of contactor 12 to gradually approach the desired pull-in pressure of contactor 12.

[0193] Therefore, by continuously receiving feedback information from the pressure sensor 124, the system can dynamically adjust the target duty cycle of the PWM signal based on the difference between the actual pull-in pressure value and the desired pull-in pressure value of the contactor 12, thereby ensuring that the contactor 12 always operates within the ideal pull-in pressure range and preventing the long-term performance and service life of the contactor 12 from being affected by excessively high or low pull-in pressure.

[0194] The power electronic device 1 according to an embodiment of the present disclosure is described below with reference to Figures 8-10.

[0195] Figure 8 is a block diagram of a power electronic device 1 according to an embodiment of the present disclosure. As shown in Figure 8, the power electronic device 1 includes the contactor control circuit 11 described in the above embodiment. The contactor control circuit 11 can precisely control the on / off time of the switch 1111 through the switching transistor 1111, the current limiting unit 1112, the reference voltage unit 1113, and the protection unit 112, and effectively absorb surge signals to protect the safety and stability of the circuit.

[0196] Figure 9 is a block diagram of a power electronic device 1 according to another embodiment of the present disclosure. As shown in Figure 9, the power electronic device 1 includes a contactor 12 as described in the above embodiment. The contactor 12 ensures that it has reliable engagement pressure and stable current conduction during operation through a contactor coil 121, a stationary contact 122, a moving contact 123 and a pressure sensor 124.

[0197] Figure 10 is a block diagram of a power electronic device 1 according to another embodiment of the present disclosure. As shown in Figure 10, the power electronic device 1 includes the contactor control circuit 11 and the contactor 12 described in the above embodiment. Through the cooperative operation of these two components, precise control of the current of the contactor coil 121 in the power system, absorption of surge signals, and monitoring of the pull-in pressure are achieved, thereby ensuring the efficient, reliable, and safe operation of the power electronic device 1 in various applications.

[0198] According to the power electronic device 1 of this disclosure, by integrating the contactor control circuit 11 and / or contactor 12 described in the above embodiments, precise control of the operating state of contactor 12 can be achieved. Specifically, by acquiring the actual detection information of contactor 12 when it is in the engaged state, the current operating state of contactor 12 can be reflected. Based on this actual detection information, the switching state of switching circuit 111 can be precisely controlled, thereby controlling the engaged state of contactor 12. This achieves a closed-loop feedback control mechanism that uses actual detection information to adjust the control signal of contactor 12, so that contactor 12 is in the desired engaged pressure state. In this way, this disclosure achieves precise adjustment of the contactor's operating state, avoiding instability problems such as excessive or insufficient current, improving the operational stability and reliability of contactor 12, and thus enhancing the safety and reliability of the entire electrical system.

[0199] The vehicle 100 according to an embodiment of the present disclosure is described below with reference to Figures 11-15.

[0200] Figure 11 is a block diagram of a vehicle 100 according to an embodiment of the present disclosure. As shown in Figure 11, the vehicle 100 includes the electronic device 200 described in the above embodiment. The processor 201 in the electronic device 200 can implement the contactor 12 control method described in the above embodiment by executing a computer program stored in the memory 202.

[0201] Figure 12 is a block diagram of a vehicle 100 according to another embodiment of the present disclosure. As shown in Figure 12, the vehicle 100 includes the power electronic device 1 described in the above embodiment. This device can effectively control the current and voltage fluctuations in the power system and ensure the efficient and safe operation of the vehicle 100 power system.

[0202] Figure 13 is a block diagram of a vehicle 100 according to another embodiment of the present disclosure. As shown in Figure 13, the vehicle 100 includes the contactor control circuit 11 described in the above embodiment. The contactor control circuit 11 can accurately control the on and off time of the switch 1111 through the switch tube 1111, the current limiting unit 1112, the reference voltage unit 1113 and the protection unit 112, and effectively absorb surge signals to protect the safety and stability of the circuit.

[0203] Figure 14 is a block diagram of a vehicle 100 according to another embodiment of the present disclosure. As shown in Figure 14, the vehicle 100 includes the contactor 12 described in the above embodiment. The contactor 12 ensures that it has reliable engagement pressure and stable current conduction during operation through the contactor coil 121, stationary contact 122, moving contact 123 and pressure sensor 124.

[0204] Figure 15 is a block diagram of a vehicle 100 according to another embodiment of the present disclosure. As shown in Figure 15, the vehicle 100 includes the contactor control circuit 11 and contactor 12 described in the above embodiment. Through the cooperative operation of these two components, precise control of the current of the contactor coil 121 in the power system, absorption of surge signals, and monitoring of the pull-in pressure are achieved, thereby ensuring the safe operation of the vehicle 100.

[0205] In some embodiments, vehicle 100 may include, but is not limited to, electric vehicles or hybrid vehicles such as cars, SUVs, trucks, vans, and buses.

[0206] According to the vehicle 100 of this disclosure, by employing the electronic device 200 described in the above embodiments, or the power electronic device 1 described in the above embodiments, or the contactor control circuit 11 and / or the contactor 12 described in the above embodiments, precise control of the contactor's operating state can be achieved. Specifically, by acquiring the actual detection information of the contactor 12 when it is in the engaged state, the current operating state of the contactor 12 can be reflected. Based on this actual detection information, the control signal of the contactor 12 can be precisely adjusted, thereby controlling the engaged state of the contactor 12 and realizing a closed-loop feedback control mechanism to ensure the contactor is in the desired engaged pressure state. In this way, this disclosure achieves precise adjustment of the contactor's operating state, avoiding instability problems such as excessive or insufficient current, improving the operational stability and reliability of the contactor 12, and thus enhancing the overall safety and reliability of the vehicle 100.

[0207] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0208] Although embodiments of this disclosure have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this disclosure, the scope of which is defined by the claims and their equivalents.

Claims

1. A contactor control method, characterized in that, include: When the contactor is in the engaged state, the actual detection information of the contactor is acquired; and Adjust the current value of the contactor coil according to the actual detection information so that the actual detection information is within the expected range.

2. The contactor control method according to claim 1, characterized in that, The actual detection information includes the actual detected current value of the contactor coil; Adjusting the current value of the contactor coil based on the actual detection information includes: determining a target control signal to maintain the contactor engagement based on the actual detected current value and the control current value of the contactor coil, so as to adjust the current value of the contactor coil.

3. The contactor control method according to claim 2, characterized in that, The target control signal for maintaining the contactor engagement is determined based on the actual detected current value and the control current value of the contactor coil, including: The target duty cycle of the pulse modulation signal that maintains the contactor engagement is determined based on the relative magnitudes of the actual detected current value and the control current value of the contactor coil.

4. The contactor control method according to claim 3, characterized in that, Determine the target duty cycle of the pulse modulation signal that maintains the contactor engagement based on the actual detected current value and the control current value of the contactor coil, including: When the actual detected current value is greater than the control current value, the target duty cycle is the current duty cycle of the pulse modulation signal reduced by a preset duty cycle adjustment step size; or When the actual detected current value is less than the control current value, the target duty cycle is the current duty cycle of the pulse modulation signal increased by a preset duty cycle adjustment step size; or When the actual detected current value is equal to the control current value, the target duty cycle is the current duty cycle of the pulse modulation signal.

5. The contactor control method according to claim 1, characterized in that, The actual detection information includes the actual engagement pressure value of the contactor; Adjusting the current value of the contactor coil based on the actual detection information includes: determining a target control signal to maintain the contactor engagement based on the actual engagement pressure value, so as to adjust the current value of the contactor coil.

6. The contactor control method according to claim 5, characterized in that, The actual engagement pressure value is the engagement pressure value between the stationary contact and the moving contact of the contactor.

7. The contactor control method according to claim 5 or 6, characterized in that, Determine the target control signal for maintaining the contactor engagement based on the actual engagement pressure value, including: The target control signal for maintaining the contactor engagement is determined based on the actual engagement pressure value and the desired engagement pressure value of the contactor.

8. The contactor control method according to claim 7, characterized in that, Determine the target control signal for maintaining the contactor engagement based on the actual engagement pressure value and the desired engagement pressure value of the contactor, including: The target duty cycle of the pulse adjustment signal for maintaining the contactor engagement is determined based on the relative magnitudes of the actual engagement pressure value and the desired engagement pressure value.

9. The contactor control method according to claim 8, wherein Determine the target duty cycle of the pulse adjustment signal to maintain the contactor engagement based on the relative magnitudes of the actual engagement pressure value and the desired engagement pressure value, including: When the actual pull-in pressure value is greater than the desired pull-in pressure value, the target duty cycle is the current duty cycle of the pulse modulation signal reduced by a preset duty cycle adjustment step size; or When the actual pull-in pressure value is less than the desired pull-in pressure value, the target duty cycle is the current duty cycle of the pulse modulation signal increased by a preset duty cycle adjustment step size; or When the actual pull-in pressure value equals the desired pull-in pressure value, the target duty cycle is the current duty cycle of the pulse modulation signal.

10. The contactor control method according to any one of claims 1-9, wherein, The contactor control method further includes: In response to the contactor activation trigger signal, an activation control signal is generated based on the required activation control current of the contactor coil; and The switching state of the switching circuit used to control the energization state of the contactor coil is controlled according to the engagement control signal, so that the contactor engages.

11. The contactor control method according to claim 10, wherein Controlling the switching state of the switching circuit used to control the energization state of the contactor coil according to the engagement control signal includes: The switching time of the switching circuit is controlled according to the pull-in control signal.

12. The contactor control method of claim 11, wherein, The pull-in control signal is a pulse-modulated signal, and the switching time of the switching circuit is controlled according to the pull-in control signal, including: The switching time of the switching circuit is controlled according to the duty cycle of the pulse modulation signal corresponding to the pull-in control signal.

13. The contactor control method of claim 12, wherein, The amplitude of the pulse adjustment signal corresponding to the engagement control signal is greater than the amplitude of the pulse adjustment signal when the contactor is in the engaged state.

14. The contactor control method according to any one of claims 1 to 9, wherein The contactor control method further includes: In response to the de-energization signal of the contactor coil, after a preset delay, the sending of the control signal to the switching circuit used to control the energization state of the contactor coil is stopped.

15. The contactor control method according to any one of claims 10-13, wherein, The contactor control method further includes: Before generating a pull-in control signal based on the pull-in control current required by the contactor coil of the contactor, the circuit connection state of the contactor coil and the switching circuit is determined.

16. The contactor control method of claim 15, wherein Determining the circuit connection state of the contactor coil and the switching circuit includes: When the contactor coil and the switching circuit are in the target state, if the detection signal at the target detection point meets the condition that the switching circuit is connected normally, then it is determined that the circuit connection of the contactor coil and the switching circuit is normal.

17. The contactor control method of claim 16, wherein, When the contactor coil and the switching circuit are in the target state, the detection signal at the target detection point satisfies the conditions for normal connection of the switching circuit, including: When the contactor coil is not energized and the switching circuit is in the open state, the detection signal of the target detection point is low level; When the contactor coil is energized and the switching circuit is open, the detection signal at the target detection point is high. When the contactor coil is energized and the switching circuit is in a conducting state for a preset time, the detection signal of the target detection point is low.

18. An electronic device (200), characterized by include: At least one processor (201); A memory (202) communicatively connected to the at least one processor (201); The memory (202) stores a computer program that can be executed by the at least one processor (201), which, when executing the computer program, implements the contactor control method according to any one of claims 1-17.

19. A computer readable storage medium having stored thereon a computer program, characterized in that, When the computer program is executed, it implements the contactor control method according to any one of claims 1-17.

20. A computer program product, characterised in that, The computer program product stores a computer program that, when executed, implements the contactor control method according to any one of claims 1-17.

21. A contactor control circuit (11), characterized by include: A switching circuit (111), the first end of which is adapted to be connected to the first end of a contactor coil (121); A controller (125) is connected to the control terminal of the switch circuit (111) and is used to control the switching state of the switch circuit (111) according to any one of claims 1-17.

22. The contactor control circuit (11) according to claim 21, characterized by The switching circuit (111) includes: A switching transistor (1111) is provided, the first end of which is adapted to be connected to the contactor coil (121), and the second end of which is grounded.

23. The contactor control circuit (11) according to claim 22, characterized by The switching circuit (111) also includes: A current limiting unit (1112) is provided, with its first end connected to the control terminal of the switching transistor (1111) and its second end connected to the controller (125), for limiting the current input to the control terminal of the switching transistor (1111).

24. The contactor control circuit (11) according to claim 22 or 23, characterized by The switching circuit (111) also includes: A reference voltage unit (1113) is provided, with its first terminal connected to the control terminal of the switching transistor (1111) and its second terminal grounded, for providing a reference voltage to the switching transistor (1111).

25. The contactor control circuit (11) according to any one of claims 21-24, characterized by, The contactor control circuit (11) also includes: A protection unit (112) is provided, wherein the first end of the protection unit (112) is adapted to be connected to the second end of the contactor coil (121) and the power supply, the second end of the protection unit (112) is adapted to be connected to the first end of the contactor coil (121), and the second end of the protection unit (112) is connected to the first end of the switching circuit (111), for forming a circuit with the contactor coil (121) to absorb surge signals at the moment when the contactor coil (121) is de-energized.

26. The contactor control circuit (11) according to claim 25, characterized by The protection unit (112) includes: A diode (1121), the cathode of which is adapted to be connected to the second terminal of the contactor coil (121) and a power supply; A resistor (1122) is provided, the first end of which is connected to the anode of the diode (1121), the second end of which is adapted to be connected to the first end of the contactor coil (121), and the second end of which is connected to the first end of the switching circuit (111).

27. The contactor control circuit (11) according to any of claims 21-26, characterized by The contactor control circuit (11) also includes: A current detection unit is connected in series with the contactor coil (121) of the contactor and is used to detect the actual current value of the contactor coil (121) of the contactor. The current detection unit is also connected to the controller (125) to send the actual current value to the controller (125).

28. The contactor control circuit (11) according to any of claims 21-27, characterized by The controller (125) is also adapted to be connected to a pressure detection unit for detecting the actual engagement pressure value of the contactor in order to obtain the actual engagement pressure value of the contactor.

29. A contactor (12) characterized by, The device includes a contactor coil (121), a stationary contact (122), a moving contact (123), and a pressure sensor (124), wherein the pressure sensor (124) is adapted to be connected to the controller (125) in the contactor control circuit (11) according to any one of claims 21-28, and the pressure sensor (124) is used to detect the actual engagement pressure value between the stationary contact (122) and the moving contact (123) in the engaged state.

30. The contactor (12) according to claim 29, characterized in that, The pressure sensor (124) is disposed on the stationary contact (122) and / or the moving contact (123).

31. The contactor (12) according to claim 30, characterized in that, The pressure sensor (124) is disposed inside the stationary contact (122).

32. A power electronic device (1), characterized in that, Includes the contactor control circuit (11) of any one of claims 21-28 and / or the contactor (12) of any one of claims 29-31.

33. A vehicle (100), characterized in that, The vehicle (100) includes the electronic device (200) of claim 18, or the vehicle (100) includes the power electronic device (1) of claim 32, or the vehicle (100) includes the contactor control circuit (11) of any one of claims 21-28 and / or the contactor (12) of any one of claims 29-31.

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