Control circuit for electromagnetic switch, switching device, electrical apparatus, and vehicle

Abstract

The application relates to a control circuit of an electromagnetic switch, a switching device, an electrical equipment and a vehicle. The control circuit of the electromagnetic switch comprises a power module and a resistance module; the resistance module is electrically connected with the power module, and is used for adjusting a first equivalent resistance value of itself according to an accessed resistance adjustment signal and outputting a feedback voltage to the power module according to the first equivalent resistance value; the power module is used for being electrically connected with the electromagnetic switch, and is used for adjusting a driving voltage output to the electromagnetic switch according to the feedback voltage; the driving voltage corresponding to the first equivalent resistance value before adjustment is not less than a pull-in voltage of the electromagnetic switch, and the driving voltage corresponding to the first equivalent resistance value after adjustment is less than the pull-in voltage but not less than a holding voltage of the electromagnetic switch. Since the driving voltage output by the power module is directly adjusted, the power consumption can be reduced without generating an impact current, and the reliability is improved.

Description

Technical Field

[0001] This application relates to the field of switch control technology, and in particular to a control circuit for an electromagnetic switch, a switching device, electrical equipment, and a vehicle. Background Technology

[0002] An electromagnetic switch is a switching device that uses a provided driving voltage to generate a magnetic force based on a current, thereby achieving opening and closing. Driving an electromagnetic switch typically involves two stages: the first stage is generating the magnetic force required for the closing operation using the provided driving voltage, and the second stage is generating the magnetic force required for the holding operation using the provided driving voltage.

[0003] In existing technologies, a constant driving voltage is provided to the electromagnetic switch to simultaneously satisfy both the engagement and holding operations. However, since the driving voltage required for holding is relatively small, this results in higher power consumption.

[0004] In existing technologies, an RC charging circuit is used to provide a varying drive voltage to the electromagnetic switch. Specifically, a capacitor is charged based on a relatively small drive voltage. When a certain amount of charge accumulates on the capacitor, it discharges to provide a momentary, higher-amplitude drive voltage to the electromagnetic switch to achieve the pull-in operation. Subsequently, a smaller-amplitude drive voltage is used to maintain the operation. However, because capacitor discharge generates inrush current, it can easily damage related components, resulting in low reliability. Summary of the Invention

[0005] This application provides a control circuit, switching device, electrical equipment, and vehicle for an electromagnetic switch. A resistor module is added to receive a resistance adjustment signal, thereby adjusting its first equivalent resistance value and outputting a feedback voltage to a power supply module based on this value. This allows the power supply module to output a drive voltage to the electromagnetic switch according to the feedback voltage, achieving adjustable drive voltage and satisfying the drive voltage requirements of the electromagnetic switch for both engagement and maintenance operations. Since the drive voltage output by the power supply module is directly adjusted, power consumption can be reduced without generating inrush current, thus at least partially solving the aforementioned technical problems.

[0006] To achieve the above objectives, according to a first aspect of this application, a control circuit for an electromagnetic switch is provided, including a power supply module and a resistor module;

[0007] The resistor module is electrically connected to the power supply module and is used to adjust its own first equivalent resistance value according to the input resistance adjustment signal and output a feedback voltage to the power supply module according to the first equivalent resistance value.

[0008] The power module is used to connect electrically to the electromagnetic switch and to adjust the drive voltage output to the electromagnetic switch according to the feedback voltage.

[0009] Before adjustment, the driving voltage corresponding to the first equivalent resistance value is not less than the pull-in voltage of the electromagnetic switch, and after adjustment, the driving voltage corresponding to the first equivalent resistance value is less than the pull-in voltage but not less than the holding voltage of the electromagnetic switch.

[0010] Optionally, the resistor module includes an output resistor unit and a feedback resistor unit connected in series;

[0011] The first end of the output resistor unit is electrically connected to the output end of the power module and is used to connect to the electromagnetic switch. The second end of the output resistor unit is electrically connected to the feedback end of the power module and the first end of the feedback resistor unit. The controlled end of the feedback resistor unit is used to receive the resistance adjustment signal, and the second end of the feedback resistor unit is used to ground.

[0012] The feedback resistor unit is used to adjust its own second equivalent resistance value according to the resistance adjustment signal and to output feedback voltage to the power supply module.

[0013] The power supply module is used to adjust the drive voltage output to the electromagnetic switch according to the feedback voltage, so that the received feedback voltage is equal to the preset voltage.

[0014] Optionally, the feedback resistor unit includes a feedback resistor, an adjustment resistor, and a switching device;

[0015] The first end of the feedback resistor is electrically connected to the second end of the output resistor unit and the feedback end of the power module, respectively, and the second end of the feedback resistor is used for grounding.

[0016] The first end of the adjusting resistor is electrically connected to the first end of the feedback resistor, the second end of the adjusting resistor is electrically connected to the first input end of the switching device, and the second input end of the switching device is electrically connected to the second end of the feedback resistor; or, the first input end of the switching device is electrically connected to the first end of the feedback resistor, the second end of the switching device is electrically connected to the first end of the adjusting resistor, and the second end of the adjusting resistor is electrically connected to the second end of the feedback resistor.

[0017] The controlled terminal of the switching device is used to receive the resistance adjustment signal, and the switching device is used to control its own switching state according to the resistance adjustment signal.

[0018] Optionally, the switching device includes a semiconductor switching transistor;

[0019] The input terminal of the semiconductor switch is used as the first access terminal of the switching device, the output terminal of the semiconductor switch is used as the second access terminal of the switching device, and the control terminal of the semiconductor switch is used as the controlled terminal of the switching device.

[0020] Optionally, the semiconductor switching transistor includes an NPN transistor;

[0021] The collector of an NPN transistor serves as the input terminal of the semiconductor switch, the emitter of an NPN transistor serves as the output terminal of the semiconductor switch, and the base of an NPN transistor serves as the control terminal of the semiconductor switch.

[0022] Optionally, the control circuit of the electromagnetic switch may also include an enable module;

[0023] The input terminal of the enable module is used to connect to the input voltage, the first output terminal of the enable module is electrically connected to the input terminal of the power module, and the second output terminal of the enable module is electrically connected to the enable terminal of the power module.

[0024] The enable module is used to output the input voltage and enable voltage to the power supply module according to the input voltage.

[0025] Optionally, the enable module includes a first voltage divider resistor and a second voltage divider resistor;

[0026] The first end of the first voltage divider resistor is electrically connected to the input terminal of the power module and is used to connect the input voltage. The second end of the first voltage divider resistor is electrically connected to the first end of the second voltage divider resistor. The second end of the second voltage divider resistor is used to ground.

[0027] Optionally, the control circuit of the electromagnetic switch may also include an input filtering module;

[0028] The input terminal of the input filter module is used to connect to the input voltage, and the output terminal of the input filter module is electrically connected to the input terminal of the power supply module to filter the input voltage input to the power supply module.

[0029] Optionally, the input filtering module includes an input capacitor;

[0030] The first end of the input capacitor is electrically connected to the input terminal of the power module and is used to connect the input voltage, while the second end of the input capacitor is used to ground.

[0031] Optionally, the control circuit of the electromagnetic switch may also include an output filtering module;

[0032] The input terminal of the output filter module is electrically connected to the power supply module, and the output terminal of the output filter module is used to be electrically connected to the electromagnetic switch to filter the drive voltage.

[0033] Optionally, the output filtering module includes an inductor and an output capacitor;

[0034] The first end of the inductor is electrically connected to the switch control terminal of the power module, the second end of the inductor is electrically connected to the first end of the output capacitor and is used to connect to the electromagnetic switch, and the second end of the output capacitor is used to ground.

[0035] According to a second aspect of this application, a switching device is provided, including an electromagnetic switch and a control circuit for the electromagnetic switch in any of the above embodiments.

[0036] Optionally, the electromagnetic switch may include a relay.

[0037] According to a third aspect of this application, an electrical device is provided, including a power supply, a load, and a switching device as described in any of the above embodiments.

[0038] The power supply is electrically connected to the load via an electromagnetic switch in the switching device.

[0039] According to a fourth aspect of this application, a vehicle is provided, including a control circuit for an electromagnetic switch in any of the above embodiments, a switching device in any of the above embodiments, or an electrical device in any of the above embodiments.

[0040] The control circuit of the electromagnetic switch in this application adds a resistor module to receive the resistance adjustment signal, thereby adjusting its own first equivalent resistance value and outputting a feedback voltage to the power supply module based on the first equivalent resistance value. This allows the power supply module to output a drive voltage to the electromagnetic switch according to the feedback voltage, realizing the adjustability of the drive voltage and meeting the drive voltage requirements of the electromagnetic switch in both the engagement and holding operations. Since the drive voltage output by the power supply module is directly adjusted, power consumption can be reduced without generating inrush current, thus improving reliability.

[0041] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0044] Figure 1 This is a schematic diagram of the structure of a switching device including an electromagnetic switch control circuit provided in an exemplary embodiment of this application;

[0045] Figure 2 This is a schematic diagram of a specific structure including a resistor module provided in an exemplary embodiment of this application;

[0046] Figure 3This is a schematic diagram showing the specific structure of the output resistor unit and the specific structure of the feedback resistor unit provided in an exemplary embodiment of this application;

[0047] Figure 4 This is a schematic diagram showing the specific structure of the switching device provided in an exemplary embodiment of this application;

[0048] Figure 5 This is a schematic diagram including an enable module provided in an exemplary embodiment of this application;

[0049] Figure 6 This is a schematic diagram showing the specific structure of the enabling module provided in an exemplary embodiment of this application;

[0050] Figure 7 This is a schematic diagram of a specific structure including an electromagnetic switch provided in an exemplary embodiment of this application. Detailed Implementation

[0051] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0052] According to the first aspect of this application, Figure 1 As shown, a control circuit for an electromagnetic switch is provided, including a power supply module and a resistor module.

[0053] The resistor module is electrically connected to the power module and is used to receive the resistance adjustment signal R_CTRL, and to adjust its own first equivalent resistance value according to the resistance adjustment signal R_CTRL and output a feedback voltage V to the power module according to the first equivalent resistance value. FB .

[0054] The resistor module exhibits different first equivalent resistance values ​​depending on the input resistance adjustment signal R_CTRL. Specifically, the resistor module first receives the first-state resistance adjustment signal R_CTRL, causing it to control its own first equivalent resistance value to the first value, thereby adjusting the resistance based on the drive voltage V output by the power supply module. OUT To output the first amplitude feedback voltage V to the power module FB Similarly, the resistor module is then connected to the second-state resistor adjustment signal R_CTRL, causing its first equivalent resistance value to be adjusted to the second resistance value, thereby adjusting the driving voltage V output by the power module. OUT To output a second amplitude feedback voltage V to the power module FB .

[0055] The power module is used to connect electrically to the electromagnetic switch and to operate according to the feedback voltage V. FB Adjust the drive voltage V output to the electromagnetic switch OUT .

[0056] Among them, when the power module is connected to the feedback voltage V of the first amplitude FB At that time, it can maintain the current driving voltage V OUT Output is performed; when the second amplitude feedback voltage V is connected to the power module. FB At that time, it can adjust the output drive voltage V. OUT Thus, based on the driving voltage V OUT The output feedback voltage V FB It can recover from the second amplitude to the first amplitude.

[0057] The driving voltage V corresponding to the first equivalent resistance value before adjustment OUT The driving voltage V corresponding to the adjusted first equivalent resistance value is not less than the pull-in voltage of the electromagnetic switch. OUT Less than the pull-in voltage but not less than the holding voltage of the electromagnetic switch.

[0058] In summary, the resistor module first receives the resistance adjustment signal R_CTRL in the first state, causing it to control its first equivalent resistance value to the first resistance value, thereby adjusting the driving voltage V output by the power supply module. OUT To output the first amplitude feedback voltage V to the power module FB The power module maintains the current drive voltage V. OUT Output is performed, at which time the driving voltage V OUT To enable the electromagnetic switch to engage, the resistor module receives a second-state resistor adjustment signal R_CTRL, causing it to adjust its first equivalent resistance to a second resistance value, thus adjusting the drive voltage V output by the power module. OUT To output a second amplitude feedback voltage V to the power module FB The power module adjusts the output drive voltage V. OUT Thus, based on the driving voltage V OUT The output feedback voltage V FB It can recover from the second amplitude to the first amplitude, at which time the driving voltage V OUT It satisfies the maintenance operation of the electromagnetic switch.

[0059] The control circuit of the electromagnetic switch in this application adds a resistor module to receive the resistance adjustment signal, thereby adjusting its own first equivalent resistance value and outputting a feedback voltage to the power supply module based on the first equivalent resistance value. This allows the power supply module to output a drive voltage to the electromagnetic switch according to the feedback voltage, realizing the adjustment of the drive voltage and meeting the drive voltage required by the electromagnetic switch in both the engagement and holding operations. Since the drive voltage output by the power supply module is directly adjusted, power consumption can be reduced without generating inrush current, thus improving reliability.

[0060] like Figure 2 As shown, optionally, the resistor module includes an output resistor unit and a feedback resistor unit connected in series.

[0061] The first end of the output resistor unit is electrically connected to the output end of the power supply module and is used to connect to the electromagnetic switch. The second end of the output resistor unit is electrically connected to the feedback end of the power supply module and the first end of the feedback resistor unit. The controlled end of the feedback resistor unit is used to connect to the resistance adjustment signal R_CTRL. The second end of the feedback resistor unit is used to ground.

[0062] The feedback resistor unit is used to adjust its second equivalent resistance value according to the resistance adjustment signal R_CTRL and to output a feedback voltage V to the power supply module. FB .

[0063] The power module is used to adjust the power supply based on the feedback voltage V. FB Adjust the drive voltage V output to the electromagnetic switch OUT So that the received feedback voltage V FB It equals the preset voltage.

[0064] Since the output resistor unit and the feedback resistor unit are connected in series, if the drive voltage V output by the power module... OUT The feedback voltage V output by the feedback resistor unit to the power module remains unchanged when the second equivalent resistance value of the feedback resistor unit changes. FB The corresponding changes will be made.

[0065] Specifically, when the resistance adjustment signal R_CTRL is in the first state before adjustment, the feedback resistor unit maintains its second equivalent resistance value at a relatively low first resistance value, and based on the driving voltage V at this time... OUT Output the first amplitude feedback voltage V to the power module FB At this time, the feedback voltage V FB It is equal to the preset voltage. When the resistance adjustment signal R_CTRL is in the adjusted second state, the feedback resistor unit adjusts its own second equivalent resistance value to a relatively high second resistance value, based on the driving voltage V at this time. OUT Output a second amplitude feedback voltage V to the power moduleFB Since the driving voltage V at this time OUT Since the resistance values ​​of both the output and feedback resistors remain unchanged, the voltage division ratio of the feedback resistor increases, resulting in a higher output feedback voltage V. FB Increase. The power module maintains the received feedback voltage V. FB To achieve the desired voltage, the output drive voltage V needs to be reduced. OUT Until the received feedback voltage V FB The feedback voltage V recovers from the second amplitude to the first amplitude. FB It equals the preset voltage.

[0066] The above analysis shows that the power module maintains the received feedback voltage V FB With the preset voltage as the objective, when the feedback resistor unit increases its second equivalent resistance value from small to large according to the input resistance adjustment signal R_CTRL, the output drive voltage V is controlled. OUT The size decreases sequentially to satisfy both the activation and holding operations of the electromagnetic switch.

[0067] like Figure 3 As shown, optionally, the output resistor unit includes an output resistor R. FBT The feedback resistor unit includes a feedback resistor R. FBB Adjusting resistor R N and switching devices.

[0068] Feedback resistor R FBB The first terminal is connected to the output resistor R respectively FBT The second terminal is electrically connected to the feedback terminal of the power module, and the feedback resistor R FBB The second terminal is used for grounding, and the output resistance R FBT The first end is electrically connected to the output end of the power module and is used for electrical connection with the electromagnetic switch.

[0069] Adjusting resistor R N The first terminal and the feedback resistor R FBB The first terminal is electrically connected, and the resistor R is adjusted. N The second terminal is electrically connected to the first input terminal of the switching device, and the second input terminal of the switching device is connected to the feedback resistor R. FBB The second terminal is electrically connected. The controlled terminal of the switching device is used to receive the resistance adjustment signal R_CTRL, so that the switching device can control its own switching state according to the resistance adjustment signal R_CTRL.

[0070] When the switching device is connected to the resistance adjustment signal R_CTRL in the first state, it remains in the on state, so that the second equivalent resistance of the feedback resistor unit is the feedback resistor R. FBB and adjusting resistor R NThe parallel resistance value; when the switching device is connected to the resistance adjustment signal R_CTRL in the second state, it is adjusted from the on state to the off state, so that the second equivalent resistance of the feedback resistor unit is the feedback resistor R. FBB The resistance value is greater than the feedback resistor R. FBB and adjusting resistor R N The parallel resistance value; through the aforementioned control, the purpose of increasing the second equivalent resistance value was achieved.

[0071] The above analysis shows that the feedback resistor unit controls the feedback resistor R through a switching device. FBB Parallel adjustment resistor R N Whether or not it is connected allows for the adjustment of the second equivalent resistance value of the feedback resistor unit.

[0072] In other embodiments, the switching device and the adjusting resistor R N The positions can also be interchanged without affecting the corresponding function; specifically, the first input terminal of the switching device and the feedback resistor R... FBB The first terminal is electrically connected, and the second terminal of the switching device is connected to the adjusting resistor R. N The first terminal is electrically connected, and the resistor R is adjusted. N The second terminal is connected to the feedback resistor R FBB The second end is electrically connected.

[0073] Optionally, the switching device includes a semiconductor switching transistor, such as... Figure 4 As shown, the semiconductor switching transistor includes an NPN transistor Q. N Feedback resistor R FBB Including the first feedback resistor R FBB1 Second feedback resistor R FBB2 The power module includes a power chip U1.

[0074] NPN transistor Q N The collector of the NPN transistor Q is used as the first input terminal of the switching device. N The emitter of the NPN transistor Q is used as the second input terminal of the switching device. N The base of the transistor Q is used as the controlled terminal of the switching device. N Through resistor R Q Connect the resistor adjustment signal R_CTRL.

[0075] Among them, when the NPN transistor Q N When the base of the NPN transistor Q is connected to a high-level resistor adjustment signal R_CTRL, N On, the first feedback resistor R FBB1 Second feedback resistor R FBB2 and adjusting resistor R NThe parallel resistance value is used as the second equivalent resistance value of the feedback resistor unit; when the NPN transistor Q... N When the base of the NPN transistor Q is connected to a low-level resistor adjustment signal R_CTRL, N From the on to the off state, the first feedback resistor R FBB1 Second feedback resistor R FBB2 The series resistance value is used as the second equivalent resistance value of the feedback resistor unit.

[0076] Specifically, in one example, the preset voltage is set to 1V (i.e., the feedback voltage V). FB Target value), output resistance R FBT Set to 300KΩ, first feedback resistor R FBB1 Set to 30KΩ, second feedback resistor R FBB2 Set the resistance to 7.5KΩ and adjust the resistor R. N Set it to 100KΩ, so that V OUT = (1+R) FBT / R FB )*V FB .

[0077] Among them, R FB The first feedback resistor R FBB1 Second feedback resistor R FBB2 and adjusting resistor R N The equivalent resistance value, that is, the second equivalent resistance value of the feedback resistor unit. When the NPN transistor Q... N When conducting, R FB The impedance is 27.272KΩ, which enables the power supply chip U1 to output a 12V drive voltage V. OUT To satisfy the activation operation of the electromagnetic switch; when the NPN transistor Q... N At the deadline, R FB The resistance is 37.5 kΩ, in order to maintain the feedback voltage V. FB The voltage is 1V, causing the power chip U1 to output a 9V drive voltage V. OUT This is to satisfy the maintenance operation of the electromagnetic switch.

[0078] like Figure 5 As shown, optionally, the control circuit of the electromagnetic switch also includes an enable module.

[0079] The input terminal of the enable module is used to connect the input voltage V. IN The first output terminal of the enable module is electrically connected to the input terminal of the power module, and the second output terminal of the enable module is electrically connected to the enable terminal of the power module.

[0080] The enable module is used to enable the input voltage V. IN The input voltage V is output to the power module respectively. IN and enable voltage VEN .

[0081] Wherein, the input voltage V IN Input is provided by a host computer (such as a DSP). When the host computer needs to control the closing of the electromagnetic switch, it outputs a high-level input voltage V to the enable module. IN This causes the enable module to output a high-level input voltage V to the power module. IN and high-level enable voltage V EN This powers the power module and initiates its operation, causing the electromagnetic switch to close and output a drive voltage V to the switch. OUT When the host computer needs to disconnect the electromagnetic switch, it outputs a low-level input voltage V to the enable module. IN This causes the enable module to output a low-level input voltage V to the power module. IN and low-level enable voltage V EN This causes the power module to power down and shut down, and closes the electromagnetic switch to stop outputting the drive voltage V to the electromagnetic switch. OUT .

[0082] like Figure 6 As shown, optionally, the enable module includes a first voltage divider resistor R. ENT Second voltage divider resistor R ENB The power module includes a power chip U1.

[0083] First voltage divider resistor R ENT The first terminal is electrically connected to the input terminal VIN of the power chip U1 and is used to connect the input voltage V. IN The first voltage divider resistor R ENT The second terminal is connected to the second voltage divider resistor R ENB The first terminal is electrically connected, and the second voltage divider resistor R ENB The second terminal is used for grounding.

[0084] Wherein, the input voltage V IN It can be used as the operating voltage of the power chip U1, through the first voltage divider resistor R. ENT Second voltage divider resistor R ENB The voltage divider effect allows it to output a voltage lower than the input voltage V to the enable terminal EN of the power chip U1. IN Enable voltage V EN .

[0085] Among them, because the power chip U1 is connected to the first voltage divider resistor R ENT Second voltage divider resistor R ENB To simultaneously connect the input voltage V IN and enable voltage V EN This causes the host computer to output a high-level input voltage V. INAt the same time, the power chip U1 simultaneously completes power-on startup and enable control.

[0086] Optionally, the control circuit of the electromagnetic switch may also include an input filtering module, such as... Figure 4 or Figure 6 As shown, the input filtering module includes an input capacitor C. IN .

[0087] Input capacitor C IN The first terminal is electrically connected to the input terminal VIN of the power chip U1 and is used to connect the input voltage V. IN Input capacitor C IN The second terminal is used for grounding.

[0088] Input capacitor C IN Used to input voltage V to power chip U1 IN Perform filtering.

[0089] In other embodiments, other specific individual devices or combinations may be used to implement the input filtering function.

[0090] Optionally, the control circuit of the electromagnetic switch may also include an output filtering module, such as... Figure 4 or Figure 6 As shown, the output filtering module includes an inductor L and an output capacitor C. OUT .

[0091] The first terminal of inductor L is electrically connected to the switching control terminal SW of power chip U1, and the second terminal of inductor L is connected to the output capacitor C. OUT The first terminal is electrically connected and used for electrical connection with an electromagnetic switch to output a drive voltage V. OUT Output capacitor C OUT The second terminal is used for grounding.

[0092] Inductor L and output capacitor C OUT Used to drive voltage V output from power chip U1 OUT Perform filtering.

[0093] In other embodiments, other specific individual devices or combinations may be used to achieve the output filtering function.

[0094] According to the second aspect of this application, such as Figure 1 As shown, a switching device is provided, including an electromagnetic switch and a control circuit for the electromagnetic switch in any of the above embodiments.

[0095] The switching device in this application includes an electromagnetic switch control circuit with an added resistor module to receive a resistance adjustment signal. This allows the switch to adjust its first equivalent resistance value and output a feedback voltage to the power supply module based on the first equivalent resistance value. The power supply module can then output a drive voltage to the electromagnetic switch according to the feedback voltage, achieving adjustable drive voltage. This satisfies the drive voltage requirements of the electromagnetic switch during both the pull-in and hold operations. Since the drive voltage output by the power supply module is directly adjusted, power consumption can be reduced without generating inrush current, thus improving reliability.

[0096] like Figure 7 As shown, optionally, the electromagnetic switch includes a relay K1.

[0097] According to a third aspect of this application, an electrical device is provided, including a power supply, a load, and a switching device as described in any of the above embodiments.

[0098] The power supply is electrically connected to the load via an electromagnetic switch in the switching device.

[0099] The control circuit of the electromagnetic switch included in the electrical equipment of this application is equipped with a resistor module to receive a resistance adjustment signal. This allows the switch to adjust its first equivalent resistance value and output a feedback voltage to the power supply module based on the first equivalent resistance value. This enables the power supply module to output a drive voltage to the electromagnetic switch according to the feedback voltage, thus achieving adjustable drive voltage. This satisfies the drive voltage required by the electromagnetic switch for both the pull-in and hold operations. Since the drive voltage output by the power supply module is directly adjusted, power consumption can be reduced without generating inrush current, thereby improving reliability.

[0100] According to a fourth aspect of this application, a vehicle is provided, including a control circuit for an electromagnetic switch in any of the above embodiments, a switching device in any of the above embodiments, or an electrical device in any of the above embodiments.

[0101] The vehicle can be a pure gasoline vehicle, or a pure electric vehicle, a plug-in hybrid electric vehicle, or a range-extended hybrid electric vehicle, etc. This application does not make any specific restrictions on this.

[0102] The control circuit of the electromagnetic switch included in this application is equipped with a resistor module to receive a resistance adjustment signal. This allows the switch to adjust its first equivalent resistance value and output a feedback voltage to the power supply module based on the first equivalent resistance value. This enables the power supply module to output a drive voltage to the electromagnetic switch according to the feedback voltage, thus achieving adjustable drive voltage. This satisfies the drive voltage required by the electromagnetic switch for both the engagement and holding operations. Since the drive voltage output by the power supply module is directly adjusted, power consumption can be reduced without generating inrush current, thereby improving reliability.

[0103] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0104] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0105] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0106] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. In the embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant content of other embodiments. Any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of this application without departing from the content of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A control circuit for an electromagnetic switch, characterized in that, Includes power supply modules and resistor modules; The resistor module is electrically connected to the power module and is used to adjust its own first equivalent resistance value according to the input resistance adjustment signal and output a feedback voltage to the power module according to the first equivalent resistance value. The power module is used to be electrically connected to the electromagnetic switch and to adjust the driving voltage output to the electromagnetic switch according to the feedback voltage. The driving voltage corresponding to the first equivalent resistance value before adjustment is not less than the pull-in voltage of the electromagnetic switch, and the driving voltage corresponding to the first equivalent resistance value after adjustment is less than the pull-in voltage but not less than the holding voltage of the electromagnetic switch.

2. The control circuit for the electromagnetic switch according to claim 1, characterized in that, The resistor module includes an output resistor unit and a feedback resistor unit connected in series; The first end of the output resistor unit is electrically connected to the output end of the power module and is used to connect to the electromagnetic switch. The second end of the output resistor unit is electrically connected to the feedback end of the power module and the first end of the feedback resistor unit. The controlled end of the feedback resistor unit is used to receive the resistance adjustment signal, and the second end of the feedback resistor unit is used to ground. The feedback resistor unit is used to adjust its own second equivalent resistance value according to the resistance adjustment signal and to output the feedback voltage to the power supply module. The power module is used to adjust the driving voltage output to the electromagnetic switch according to the feedback voltage, so that the received feedback voltage is equal to the preset voltage.

3. The control circuit for the electromagnetic switch according to claim 2, characterized in that, The feedback resistor unit includes a feedback resistor, an adjustment resistor, and a switching device; The first end of the feedback resistor is electrically connected to the second end of the output resistor unit and the feedback end of the power module, respectively, and the second end of the feedback resistor is used for grounding; The first end of the adjusting resistor is electrically connected to the first end of the feedback resistor, the second end of the adjusting resistor is electrically connected to the first access end of the switching device, and the second access end of the switching device is electrically connected to the second end of the feedback resistor; or, the first access end of the switching device is electrically connected to the first end of the feedback resistor, the second end of the switching device is electrically connected to the first end of the adjusting resistor, and the second end of the adjusting resistor is electrically connected to the second end of the feedback resistor. The controlled terminal of the switching device is used to receive the resistance adjustment signal, and the switching device is used to control its own switching state according to the resistance adjustment signal.

4. The control circuit of the electromagnetic switch according to claim 3, characterized in that, The switching device includes a semiconductor switching transistor; The input terminal of the semiconductor switch is used as the first access terminal of the switching device, the output terminal of the semiconductor switch is used as the second access terminal of the switching device, and the control terminal of the semiconductor switch is used as the controlled terminal of the switching device.

5. The control circuit for the electromagnetic switch according to claim 4, characterized in that, The semiconductor switching transistor includes an NPN transistor; The collector of the NPN transistor serves as the input terminal of the semiconductor switch, the emitter of the NPN transistor serves as the output terminal of the semiconductor switch, and the base of the NPN transistor serves as the control terminal of the semiconductor switch.

6. The control circuit of the electromagnetic switch according to claim 1, characterized in that, The control circuit of the electromagnetic switch also includes an enable module; The input terminal of the enable module is used to connect to the input voltage, the first output terminal of the enable module is electrically connected to the input terminal of the power module, and the second output terminal of the enable module is electrically connected to the enable terminal of the power module. The enabling module is used to output the input voltage and the enabling voltage to the power supply module according to the input voltage.

7. The control circuit for the electromagnetic switch according to claim 6, characterized in that, The enabling module includes a first voltage divider resistor and a second voltage divider resistor; The first end of the first voltage divider resistor is electrically connected to the input terminal of the power module and is used to connect to the input voltage. The second end of the first voltage divider resistor is electrically connected to the first end of the second voltage divider resistor. The second end of the second voltage divider resistor is used to ground.

8. The control circuit for the electromagnetic switch according to claim 1, characterized in that, The control circuit of the electromagnetic switch also includes an input filtering module; The input terminal of the input filtering module is used to receive the input voltage, and the output terminal of the input filtering module is electrically connected to the input terminal of the power supply module, for filtering the input voltage input to the power supply module.

9. The control circuit for the electromagnetic switch according to claim 8, characterized in that, The input filtering module includes an input capacitor; The first end of the input capacitor is electrically connected to the input end of the power module and is used to connect to the input voltage, while the second end of the input capacitor is used to ground.

10. The control circuit of the electromagnetic switch according to claim 1, characterized in that, The control circuit of the electromagnetic switch also includes an output filtering module; The input terminal of the output filtering module is electrically connected to the power supply module, and the output terminal of the output filtering module is electrically connected to the electromagnetic switch to filter the driving voltage.

11. The control circuit for the electromagnetic switch according to claim 10, characterized in that, The output filtering module includes an inductor and an output capacitor; The first end of the inductor is electrically connected to the switch control terminal of the power module, the second end of the inductor is electrically connected to the first end of the output capacitor and is used to connect to the electromagnetic switch, and the second end of the output capacitor is grounded.

12. A switching device, characterized in that, Includes an electromagnetic switch and a control circuit for the electromagnetic switch as described in any one of claims 1 to 11.

13. The switching device according to claim 12, characterized in that, The electromagnetic switch includes a relay.

14. An electrical device, characterized in that, Includes a power supply, a load, and the switching device as described in claim 12 or 13; The power supply is electrically connected to the load via an electromagnetic switch in the switching device.

15. A vehicle, characterized in that, It includes the control circuit of the electromagnetic switch according to any one of claims 1 to 11, or the switching device according to claim 12 or 13, or the electrical equipment according to claim 14.

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