Control circuit and control method of switch mechanism, and vehicle-mounted refrigerator

Abstract

The embodiment of the present application relates to the technical field of switch mechanism of vehicle refrigerator, and discloses a control circuit and control method of switch mechanism and vehicle refrigerator.The control circuit of switch mechanism comprises a main control circuit electrically connected with the positive electrode power supply end of a motor, a first switch circuit, a first end of the first switch circuit being electrically connected with the positive electrode power supply end of the motor, a second end of the first switch circuit being electrically connected with the negative electrode power supply end and the grounding end of the motor, a loop switch power supply end, the loop switch power supply end being electrically connected with the controlled end of the first switch circuit and being used for outputting switch on voltage, a second switch circuit, a first end of the second switch circuit being electrically connected with the loop switch power supply end and the controlled end of the first switch circuit, a second end of the second switch circuit being electrically connected with the grounding end, and the controlled end being electrically connected with the main control circuit, and the main control circuit is used for controlling the turn-on or turn-off of the second switch, so that the first switch circuit is turned off or turned on, a power supply voltage is provided for the forward rotation of the motor, or a discharge path is provided for the induced electromotive force generated by the reverse rotation of the motor.The present application aims to reduce the noise during the operation of the switch mechanism.

Description

Technical Field

[0001] This invention relates to the field of vehicle refrigerator switching mechanism technology, specifically to a control circuit, control method, and vehicle refrigerator for a switching mechanism. Background Technology

[0002] With the development of the automotive industry, users are increasingly demanding higher levels of driving safety and comfort. As an important feature to enhance the driving experience, in-car refrigerators are gradually becoming a standard feature in automobiles, driven by the widespread adoption of new energy vehicles and the expansion of consumption scenarios.

[0003] In existing technologies, in-vehicle refrigerators are typically opened by the user clicking the door open button on the refrigerator's touchscreen, which powers the unlocking motor. The motor then drives the locking mechanism to unlock the refrigerator. After the user operates the refrigerator, both the locking mechanism and the motor drive assembly automatically reset under the action of springs. However, the reset speed of the locking mechanism and the motor drive assembly under the action of springs is very fast. Due to the lack of buffering and damping devices, the motor drive assembly impacts its casing, generating collision noise. Summary of the Invention

[0004] In view of the above problems, embodiments of the present invention provide a control circuit, control method and vehicle refrigerator for a switching mechanism, which are used to solve the problem of collision noise caused by the motor hitting its housing in the prior art.

[0005] To achieve the above objectives, the present invention proposes a control circuit for a switching mechanism, which is applied to a switching mechanism including a motor. The control circuit for the switching mechanism includes: The main control circuit is electrically connected to the positive power supply terminal of the motor. A first switching circuit, wherein a first terminal of the first switching circuit is electrically connected to the positive power supply terminal of the motor, and a second terminal of the first switching circuit is electrically connected to the negative power supply terminal and the ground terminal of the motor. The circuit switching power supply terminal is electrically connected to the controlled terminal of the first switching circuit; the circuit switching power supply terminal is used to output the switch conduction voltage. The second switching circuit has a first terminal electrically connected to the circuit switch power supply terminal and the controlled terminal of the first switching circuit, a second terminal electrically connected to the ground terminal, and a controlled terminal electrically connected to the main control circuit. The main control circuit is used to control the second switching circuit to conduct the path between the circuit switch power supply terminal, the controlled terminal of the first switching circuit and the ground terminal, so as to turn off the first switching circuit. The main control circuit is also used to control the second switching circuit to shut off the path between the circuit switch power supply terminal, the controlled terminal of the first switching circuit and the ground terminal, so as to turn on the first switching circuit and provide a discharge path for the induced electromotive force generated by the reverse rotation of the motor.

[0006] In one alternative embodiment, the first switching circuit includes a first switching transistor; a first terminal of the first switching transistor is electrically connected to the positive power supply terminal of the motor, a second terminal of the first switching transistor is electrically connected to the negative power supply terminal and ground terminal of the motor, and a controlled terminal of the first switching transistor is electrically connected to the circuit switching power supply terminal and the first terminal of the second switching transistor. The second switching circuit includes a second switching transistor, a first resistor, and a second resistor; the controlled terminal of the second switching transistor is electrically connected to the second terminal of the first resistor and the first terminal of the second resistor, and the second terminal of the second switching transistor is electrically connected to the second terminal of the second resistor; the first terminal of the first resistor is electrically connected to the main control circuit.

[0007] In one alternative embodiment, the control circuit of the switching mechanism further includes a pull-up circuit, the first end of which is electrically connected to the power supply terminal of the loop switch, and the second end of which is electrically connected to the controlled terminal of the first switching circuit and the first end of the second switching circuit.

[0008] In one alternative embodiment, the pull-up circuit includes a third resistor; a first end of the third resistor is electrically connected to the circuit switching power supply terminal, and a second end of the third resistor is electrically connected to the controlled terminal of the first switching circuit.

[0009] In one alternative embodiment, the control circuit of the switching mechanism further includes a voltage regulator circuit, wherein a first terminal of the voltage regulator circuit is electrically connected to the controlled terminal of the first switching circuit and the first terminal of the second switching circuit, and a second terminal of the voltage regulator circuit is electrically connected to a ground terminal.

[0010] In one alternative embodiment, the voltage regulator circuit includes a first capacitor and a first diode; Wherein, the first terminal of the first capacitor is electrically connected to the circuit switching power supply terminal, the controlled terminal of the first switching circuit, and the cathode of the first diode; the second terminal of the first capacitor is electrically connected to the anode and ground terminal of the first diode.

[0011] In one alternative embodiment, the control circuit of the switching mechanism further includes a freewheeling protection circuit, wherein the input terminal of the freewheeling protection circuit is electrically connected to the negative power supply terminal of the motor, and the output terminal of the freewheeling protection circuit is electrically connected to the positive power supply terminal of the motor.

[0012] In one alternative embodiment, the freewheeling protection circuit includes a second diode; The cathode of the second diode is electrically connected to the negative power supply terminal of the motor, and the anode of the second diode is electrically connected to the negative power supply terminal of the motor.

[0013] The present invention also proposes a control method for a switching mechanism, applied to a control circuit of any of the switching mechanisms described above, wherein the control method for the switching mechanism includes: Output power supply voltage to the positive power supply terminal of the motor, and control the second switching circuit to conduct the path between the circuit switching power supply terminal, the controlled terminal of the first switching circuit and the ground terminal, so as to turn off the first switching circuit; Stop supplying power voltage to the positive power terminal of the motor, and control the second switching circuit to turn off the path between the circuit switching power terminal, the controlled terminal of the first switching circuit, and the ground terminal, so that the first switching circuit can be turned on.

[0014] The present invention also proposes a vehicle refrigerator, the vehicle refrigerator including a switching mechanism and a control circuit for the switching mechanism as described in any of the above claims; The switching mechanism includes a locking component, a motor for driving the locking component to unlock, and an elastic reset component for driving the motor drive component to reset.

[0015] This invention, through a control circuit for a switching mechanism, effectively reduces noise during operation without the need for additional buffer or damping devices. The switching mechanism includes a motor. Upon receiving a corresponding trigger signal, the control circuit supplies power to the motor, enabling it to overcome the tension of the elastic reset component and unlock the locking component. After the locking component unlocks, the main control circuit stops supplying power to the motor. At this point, the motor resets under the drive of the elastic reset component, generating an induced electromotive force (EMF). The main control circuit controls a second switching circuit to drive a first switching circuit to connect the positive and negative power terminals of the motor, providing a discharge path for the induced EMF and generating an induced current. According to Lenz's law, the magnetic field generated by the induced current opposes its relative motion, thus hindering the rotation of the rotor in the motor, which is driven by the elastic reset component. Therefore, the generation of the induced EMF partially offsets the tension of the elastic reset component, allowing the motor to slowly reset under the combined force of its own induced EMF and the elastic reset component, effectively reducing noise during operation.

[0016] The above description is merely an overview of the technical solutions of the embodiments of the present invention. In order to better understand the technical means of the embodiments of the present invention and to implement them in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the embodiments of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0017] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A schematic diagram of the control circuit of the switching mechanism of the present invention is shown; Figure 2 A circuit diagram of an embodiment of the control circuit of the switching mechanism of the present invention is shown; Figure 3 A flowchart illustrating the control method of the switching mechanism of the present invention is shown.

[0018] Explanation of icon numbers: 10. Locking assembly; 20. Motor; 30. Elastic reset assembly; 40. Main control circuit; 50. First switching circuit; 60. Circuit switching power supply terminal; 70. Second switching circuit; 80. Pull-up circuit; 90. Voltage regulator circuit; 100. Freewheeling protection circuit; R1-R3, first resistor-third resistor; Q1-Q2, first switching transistor-second switching transistor; D1-D2, first diode-second diode; C1, first capacitor. Detailed Implementation

[0019] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein.

[0020] With the development of the automotive industry, users are increasingly demanding higher levels of driving safety and comfort. As an important feature to enhance the driving experience, in-car refrigerators are gradually becoming a standard feature in automobiles, driven by the widespread adoption of new energy vehicles and the expansion of consumption scenarios.

[0021] In existing technologies, in-vehicle refrigerators are typically opened by the user clicking the door open button on the refrigerator's touchscreen, which powers the unlocking motor. The motor then drives the locking mechanism to unlock the refrigerator. After the user completes the operation, both the locking mechanism and the motor automatically reset under the action of springs. However, the reset speed of the locking mechanism and motor under the action of springs is very fast. Due to the lack of buffering and damping devices, the motor impacts its casing, generating collision noise.

[0022] To solve the above problems, refer to Figure 1 and Figure 2 This invention proposes a control circuit for a switching mechanism, applied to a switching mechanism including a motor 20, and the control circuit for the switching mechanism includes: The main control circuit 40, wherein the power output terminal VCC of the main control circuit 40 is electrically connected to the positive power terminal of the motor 20; A first switching circuit 50, wherein the first terminal D of the first switching circuit 50 is electrically connected to the positive power supply terminal of the motor 20, and the second terminal S of the first switching circuit 50 is electrically connected to the negative power supply terminal and the ground terminal of the motor 20. The circuit switching power supply terminal 60 is electrically connected to the controlled terminal G of the first switching circuit 50; the circuit switching power supply terminal 60 is used to output the switch conduction voltage. The second switching circuit 70 has its first terminal C electrically connected to the circuit switching power supply terminal 60 and the controlled terminal G of the first switching circuit 50, its second terminal E electrically connected to the ground terminal, and its controlled terminal B electrically connected to the main control circuit 40. The main control circuit 40 is used to control the second switching circuit 70 to conduct the path between the circuit switching power supply terminal 60, the controlled terminal G of the first switching circuit 50 and the ground terminal, so as to turn off the first switching circuit 50. The main control circuit 40 also controls the second switch circuit 70 to shut off the path between the circuit switch power supply terminal 60, the controlled terminal G of the first switch circuit 50 and the ground terminal, so that the first switch circuit 50 is turned on, so as to provide a discharge path for the induced electromotive force generated by the reverse rotation of the motor 20.

[0023] Understandably, existing refrigerator doors typically have magnetic closures for easy opening and closing. However, this isn't suitable for car refrigerators due to the bumpy ride. If a car refrigerator used magnetic closures, the door would easily open, causing temperature fluctuations that accelerate food spoilage and increase energy consumption. Therefore, car refrigerators usually employ a switch mechanism to secure the door, with a corresponding trigger device 40 controlling the mechanism. This allows the user to unlock the door by activating the trigger. Specifically, the switch mechanism includes a locking component 10 for locking the door, a motor 20 for unlocking the locking component 10, and a resilient reset component 30 for resetting the motor 20. After unlocking, the user can pull the door out and retract it after use, thus automatically locking the door. The motor 20 will also be reset under the drive of the elastic reset component 30, so as to facilitate the subsequent unlocking drive of the locking component 10 by the motor 20. Furthermore, the motor 20 also includes a push rod or a fixing member, and the elastic reset component 30 can be implemented by means of a spring, elastic rubber component, etc.

[0024] In this embodiment, the triggering device 40 can be implemented using a push-button switch, a capacitive triggering device 40, or the like. The triggering device 40 can be installed on the vehicle refrigerator body and / or refrigerator door as needed for user activation. If the vehicle refrigerator has a corresponding touch display device, the triggering device 40 can also be integrated into the touch display device. By installing the triggering device 40 and electrically connecting its output to the main control circuit 40, when the triggering device 40 is activated, the main control circuit 40 triggers the unlocking signal output by the device 40, thereby confirming that the user is in a state where they need to use the vehicle refrigerator. Furthermore, the triggering device 40 and the main control circuit 40 can be connected via CAN bus communication, RS-485, or RS-232 communication.

[0025] In this embodiment, the main control circuit 40 can be implemented using a main controller and a corresponding power switch. For example, the main controller can be implemented using an MCU (Microcontroller Unit), a SOC (System-on-Chip), a DSP (Digital Signal Processor), or an FPGA (Field Programmable Gate Array). The power switch can be implemented using at least one switching transistor, such as a MOSFET, IGBT, thyristor, transistor, or power transistor, and / or using at least one switching device, such as a contactor, circuit breaker, or relay. The main control circuit 40 also has a corresponding power input terminal and a power output terminal VCC to enable or disable the power path between the power input and power output terminals by controlling the power switch. Furthermore, the main control circuit 40 can obtain the corresponding operating voltage through the power input terminal. By electrically connecting the power output terminal VCC of the main control circuit 40 to the positive power supply terminal of the motor 20, the operating state of the motor 20 can be controlled under the control of the main control circuit 40.

[0026] In this embodiment, the first switching circuit 50 can be implemented using at least one switching transistor, such as a MOSFET or an IGBT. The loop switching power supply terminal 60 is the internal power supply terminal of the control component that outputs a fixed voltage. The second switching circuit 70 can be implemented using a transistor or an optocoupler. It should be noted that the first terminal D and the second terminal of the first switching circuit 50 are electrically connected to the positive power supply terminal and the negative power supply terminal of the motor 20, respectively. Therefore, the reverse electromotive force generated by the motor 20 may need to be discharged by the first switching circuit 50. When the first switching circuit 50 uses a MOSFET with a body diode or an IGBT with an anti-parallel freewheeling diode, freewheeling current can be provided to the motor 20. In addition, the on-resistance of the MOSFET and IGBT is small when they are turned on, thus avoiding the loss of the induced current generated by the motor 20. However, the main control circuit 40 cannot effectively and stably drive the MOSFET and IGBT. Therefore, by setting the loop switching power supply terminal 60 and the second switching circuit 70, the main control circuit 40 can stably drive the first switching circuit 50. It is understandable that when the second switching circuit 70 does not receive the control signal output from the signal output terminal INPUT of the main control circuit 40, the second switching circuit 70 will be in a normally open state. At this time, the voltage signal of the controlled terminal G of the first switching circuit 50 is the switching on voltage output from the loop switching power supply terminal 60, thus achieving conduction. Because the loop switching power supply terminal 60 continuously outputs the switching on voltage, the first switching circuit 50 is in a normally closed state. When the second switching circuit 70 receives the control signal output from the signal output terminal INPUT of the main control circuit 40, the second switching circuit 70 will be in a conducting state. At this time, the voltage signal of the controlled terminal G of the first switching circuit 50 is pulled low by the ground terminal, thus turning off. Furthermore, when the main control circuit 40 receives the unlocking signal, the main control circuit 40 will control the second switching circuit 70 to conduct; after the main control circuit 40 determines that the locking component 10 is unlocked, the main control circuit 40 will control the second switching circuit 70 to turn off.

[0027] Therefore, when the main control circuit 40 receives the unlock signal, it outputs a power supply voltage to the positive power terminal of the motor 20 through the power output terminal VCC, and indirectly controls the first switching circuit 50 to cut off the path between the positive and negative power terminals of the motor 20 through the signal output terminal VCC, so that the motor 20 drives the locking component 10 to unlock. After the main control circuit 40 confirms that the locking component 10 is unlocked, it stops outputting a power supply voltage to the positive power terminal of the motor 20 through the power output terminal VCC, and indirectly controls the first switching circuit 50 to open the path between the positive and negative power terminals of the motor 20 through the signal output terminal VCC. At this time, the elastic reset component 30 will reset the drive motor 20. During the process of the elastic reset component 30 driving the motor 20 to reset, the motor 20 generates an induced electromotive force. When the path between the positive and negative power terminals of the motor 20 is completed, forming a discharge path, it offsets part of the pulling force of the elastic reset component 30, thereby causing the motor 20 to reset slowly. It can be understood that the pulling force of the elastic reset component 30 is at its maximum when the motor 20 unlocks the locking component 10. When the main control circuit 40 stops supplying power to the positive power terminal of the motor 20, the rotor in the motor 20 will rotate under the drive of the elastic reset component 30, thereby causing the rotor to move in the permanent magnet magnetic field, cutting magnetic field lines and generating an induced electromotive force. The magnitude of the induced electromotive force is proportional to the rotation speed, that is, the greater the pulling force of the elastic reset component 30, the faster the rotor speed, and the greater the induced electromotive force generated. The larger the induced electromotive force, the larger the induced current it generates in the closed circuit. According to Lenz's law, the magnetic field generated by the induced current opposes its relative motion, that is, it hinders the rotor from continuing to rotate, thereby reducing the rotor speed and thus reducing the noise of the switching mechanism during operation. It should be noted that the main control circuit 40 can determine whether the locking component 10 is in the unlocked state through other trigger components, thereby accurately controlling the output of the power supply voltage.

[0028] By employing a control circuit for a switching mechanism, noise during operation can be effectively reduced without the need for additional buffer or damping devices. The switching mechanism includes a motor 20. Upon receiving a corresponding trigger signal, the control circuit 50 supplies power to the motor 20, enabling it to overcome the tension of the elastic reset component 30 and unlock the locking component 10. After the locking component 10 unlocks, the main control circuit 40 stops supplying power to the motor 20. At this point, the motor 20 resets under the drive of the elastic reset component 30, thereby generating an induced electromotive force. The main control circuit 40 controls the second switching circuit drive 63 to connect the positive and negative power terminals of the motor 20, providing a discharge path for the induced electromotive force generated by the motor 20, thus generating an induced current. According to Lenz's law, the magnetic field generated by the induced current opposes the relative motion of the induced current, which in turn opposes the rotation of the rotor in the motor 20, which is driven by the elastic reset component 30. Therefore, the generation of induced electromotive force will offset part of the pulling force of the elastic reset component 30, so that the motor 20 slowly resets under the combined force of its own induced electromotive force and the elastic reset component 30, thereby effectively reducing the noise when the switching mechanism is working.

[0029] refer to Figure 2 In one embodiment of the present invention, the first switching circuit 50 includes a first switching transistor Q1; the second switching circuit 70 includes a second switching transistor Q2, a first resistor R1, and a second resistor R2. Specifically, the first terminal of the first switch Q1 is electrically connected to the positive power supply terminal of the motor 20, the second terminal of the first switch Q1 is electrically connected to the negative power supply terminal and the ground terminal of the motor 20, the controlled terminal of the first switch Q1 is electrically connected to the circuit switch power supply terminal 60 and the first terminal of the second switch Q2; the controlled terminal of the second switch Q2 is electrically connected to the second terminal of the first resistor R1 and the first terminal of the second resistor R2, the second terminal of the second switch Q2 is electrically connected to the second terminal of the second resistor R2; and the first terminal of the first resistor R1 is electrically connected to the main control circuit 40.

[0030] In this embodiment, the first switch Q1 can be an NMOS transistor or an IGBT transistor, and the second switch Q2 can be an NPN transistor or a PNP transistor. The first resistor R1 is a current-limiting resistor. By electrically connecting the first end of the first resistor R1 to the main control circuit 40 and the second end of the first resistor R1 to the controlled terminal of the second switch Q2, the second switch Q2 is prevented from burning out due to high current. The second resistor R2 is a pull-down resistor. It prevents high-impedance level fluctuations when there is no signal input. By grounding the second resistor R2, a low level is forcibly maintained, ensuring that the second switch Q2 is in the off state when no signal is received.

[0031] refer to Figure 2 In one embodiment of the present invention, the loop switch circuit 60 further includes: Pull-up circuit 80, the first end of which is electrically connected to the circuit switching power supply terminal 60, and the second end of which is electrically connected to the controlled terminal G of the first switching circuit 50 and the first terminal C of the second switching circuit 70; A voltage regulator circuit 90, wherein the first terminal of the voltage regulator circuit 90 is electrically connected to the second terminal of the pull-up circuit 80, the controlled terminal G of the first switching circuit 50, and the first terminal C of the second switching circuit 70, and the second terminal of the voltage regulator circuit 90 is electrically connected to the ground terminal.

[0032] In this embodiment, to ensure that the first switching circuit 50 can stably conduct when the second switching circuit is not in a conducting state, that is, the first switching circuit 50 can stably conduct under the switching conduction voltage output by the loop switching power supply terminal 60, the first terminal of the pull-up circuit 80 is electrically connected to the loop switching power supply terminal 60, and the second terminal of the pull-up circuit 80 is electrically connected to the controlled terminal G of the first switching circuit 50 and the first terminal C of the second switching circuit 70. This ensures that when the second switching circuit 70 is not conducting, the loop switching power supply terminal 60 provides a stable high level to the controlled terminal G of the first switching circuit 50. The pull-up circuit 80 can be implemented using a pull-up resistor. The first terminal of the voltage regulator circuit 90 is electrically connected to the second terminal of the pull-up circuit 80, the controlled terminal G of the first switching circuit 50, and the first terminal C of the second switching circuit 70. The second terminal of the voltage regulator circuit 90 is electrically connected to the ground terminal, thus stabilizing the switching conduction voltage received by the controlled terminal G of the first switching circuit 50. The voltage regulator circuit 90 can be implemented using a capacitor, a Zener diode, etc.

[0033] Optionally, the pull-up circuit 80 includes a third resistor R3, and the voltage regulator circuit 90 includes a first capacitor C1 and a first diode D1; Wherein, the first end of the third resistor R3 is electrically connected to the circuit switching power supply terminal 60, the second end of the third resistor R3 is electrically connected to the controlled terminal G of the first switching circuit 50, the first terminal C of the second switching circuit 70, the first terminal of the first capacitor C1, and the cathode of the first diode D1; the second end of the first capacitor C1 is electrically connected to the anode and ground terminal of the first diode D1.

[0034] refer to Figure 2 In one embodiment of the present invention, the control circuit of the switching mechanism further includes a freewheeling protection circuit 100, the input terminal of the freewheeling protection circuit 100 being electrically connected to the negative power supply terminal of the motor 20, and the output terminal of the freewheeling protection circuit 100 being electrically connected to the positive power supply terminal of the motor 20.

[0035] It is understandable that a motor is essentially an inductor. According to the law of electromagnetic induction, the current in an inductor cannot change abruptly. When the motor's supply voltage suddenly disappears, the magnetic field in the motor coil collapses rapidly, attempting to maintain the original current direction. This instantaneously induces an extremely high reverse voltage, or back electromotive force, at the motor terminals, with a peak value potentially reaching tens or even hundreds of volts. Without a parallel freewheeling protection circuit 100, this instantaneous high voltage has nowhere to dissipate, easily damaging the main control circuit 40 or generating strong electromagnetic interference, affecting the normal operation of other sensitive components in the circuit. Therefore, in this embodiment, by setting up a freewheeling protection circuit 100, and electrically connecting its input terminal to the negative power supply terminal of the motor 20, and its output terminal to the positive power supply terminal of the motor 20, the back electromotive force generated by the motor is forward-conducted through the freewheeling protection circuit 100. At this time, the motor coil, the freewheeling protection circuit 100, and the main control circuit 40 form a closed loop. The magnetic energy stored in the coil is converted into electrical energy, which is slowly consumed in the form of current through this circuit, thereby clamping the voltage at both ends of the motor within a safe range.

[0036] Optionally, the freewheeling protection circuit 100 includes a second diode D2; The cathode of the second diode D2 is electrically connected to the negative power supply terminal of the motor 20, and the anode of the second diode D2 is electrically connected to the negative power supply terminal of the motor 20.

[0037] refer to Figure 3 The present invention also proposes a control method for a switching mechanism, applied to a control circuit of any of the switching mechanisms described above, wherein the control method for the switching mechanism includes: Step S100: Output the power supply voltage to the positive power supply terminal of the motor, and control the second switching circuit to conduct the path between the circuit switching power supply terminal, the controlled terminal of the first switching circuit and the ground terminal, so as to turn off the first switching circuit; Step S200: Stop outputting power supply voltage to the positive power supply terminal of the motor, and control the second switching circuit to turn off the path between the circuit switching power supply terminal, the controlled terminal of the first switching circuit and the ground terminal, so as to turn on the first switching circuit.

[0038] In this embodiment, when the main control circuit 40 receives the corresponding unlock signal, it outputs a power supply voltage to the positive power terminal of the motor 20 and outputs a corresponding control signal to the second switching circuit 70. This controls the second switching circuit 70 to turn on the circuit between the power supply terminal 60, the controlled terminal G of the first switching circuit 50, and the ground terminal, thereby turning off the first switching circuit 50. At this time, the circuit between the positive and negative power terminals of the motor 20 is turned off, allowing the motor 20 to operate under the power supply voltage input by the main control circuit 40. When the main control circuit 40 determines that the locking component 10 is in the unlocked state, it stops outputting the power supply voltage to the positive power terminal of the motor 20 and stops outputting the control signal to the second switching circuit 70. This causes the second switching circuit 70 to turn off the circuit between the power supply terminal 60, the controlled terminal G of the first switching circuit 50, and the ground terminal, thereby turning on the first switching circuit 50 to provide a discharge path for the induced electromotive force generated by the motor 20.

[0039] It is worth noting that since the control method of the switching mechanism of the present invention is based on the control circuit of the above-mentioned switching mechanism, the embodiments of the control method of the switching mechanism of the present invention include all the technical solutions of all embodiments of the control circuit of the above-mentioned switching mechanism, and the technical effects achieved are exactly the same, so they will not be repeated here.

[0040] The present invention also proposes a vehicle refrigerator, the vehicle refrigerator including a switching mechanism and a control circuit for the switching mechanism as described in any of the above claims; The switching mechanism includes a locking component, a motor for driving the locking component to unlock, and an elastic reset component for driving the motor drive component to reset.

[0041] It is worth noting that since the vehicle refrigerator of the present invention is based on the control circuit of the above-mentioned switching mechanism, the embodiments of the vehicle refrigerator of the present invention include all the technical solutions of all embodiments of the control circuit of the above-mentioned switching mechanism, and the technical effects achieved are exactly the same, which will not be repeated here.

[0042] The algorithms or displays provided herein are not inherently related to any particular computer, virtual system, or other device. Furthermore, the embodiments of this invention are not directed to any particular programming language.

[0043] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the invention may be practiced without these specific details. Similarly, for the sake of brevity and to aid in understanding one or more aspects of the invention, in the description of exemplary embodiments of the invention above, various features of the embodiments are sometimes grouped together in a single embodiment, figure, or description thereof. The claims, which follow the detailed description, are hereby expressly incorporated into that detailed description, wherein each claim itself is a separate embodiment of the invention.

[0044] Those skilled in the art will understand that the modules in the device of the embodiment can be adaptively changed and placed in one or more devices different from that embodiment. Modules, units, or components in the embodiment can be combined into a single module, unit, or component, and further, they can be divided into multiple sub-modules, sub-units, or sub-components, except that at least some of such features and / or processes or units are mutually exclusive.

[0045] It should be noted that the above embodiments are illustrative of the invention and not restrictive, and that those skilled in the art can devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention can be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names. The steps in the above embodiments, unless otherwise specified, should not be construed as limiting the order of execution.

Claims

1. A control circuit for a switching mechanism, applied to a switching mechanism, characterized in that, The switching mechanism includes a motor, and the control circuit of the switching mechanism includes: The main control circuit is electrically connected to the positive power supply terminal of the motor. A first switching circuit, wherein a first terminal of the first switching circuit is electrically connected to the positive power supply terminal of the motor, and a second terminal of the first switching circuit is electrically connected to the negative power supply terminal and the ground terminal of the motor. The circuit switching power supply terminal is electrically connected to the controlled terminal of the first switching circuit; the circuit switching power supply terminal is used to output the switch conduction voltage. The second switching circuit has a first terminal electrically connected to the circuit switch power supply terminal and the controlled terminal of the first switching circuit, a second terminal electrically connected to the ground terminal, and a controlled terminal electrically connected to the main control circuit. The main control circuit is used to control the second switching circuit to conduct the path between the circuit switch power supply terminal, the controlled terminal of the first switching circuit and the ground terminal, so as to turn off the first switching circuit. The main control circuit is also used to control the second switching circuit to shut off the path between the circuit switch power supply terminal, the controlled terminal of the first switching circuit and the ground terminal, so as to turn on the first switching circuit and provide a discharge path for the induced electromotive force generated by the reverse rotation of the motor.

2. The control circuit for the switching mechanism as described in claim 1, characterized in that, The first switching circuit includes a first switching transistor; the first end of the first switching transistor is electrically connected to the positive power supply terminal of the motor, the second end of the first switching transistor is electrically connected to the negative power supply terminal and the ground terminal of the motor, and the controlled end of the first switching transistor is electrically connected to the circuit switching power supply terminal and the first end of the second switching transistor. The second switching circuit includes a second switching transistor, a first resistor, and a second resistor; the controlled terminal of the second switching transistor is electrically connected to the second terminal of the first resistor and the first terminal of the second resistor, and the second terminal of the second switching transistor is electrically connected to the second terminal of the second resistor; the first terminal of the first resistor is electrically connected to the main control circuit.

3. The control circuit for the switching mechanism as described in any one of claims 1 or 2, characterized in that, The control circuit of the switching mechanism further includes a pull-up circuit. The first end of the pull-up circuit is electrically connected to the power supply terminal of the circuit switch, and the second end of the pull-up circuit is electrically connected to the controlled terminal of the first switching circuit and the first end of the second switching circuit.

4. The control circuit for the switching mechanism as described in claim 3, characterized in that, The pull-up circuit includes a third resistor; the first end of the third resistor is electrically connected to the circuit switching power supply terminal, and the second end of the third resistor is electrically connected to the controlled terminal of the first switching circuit.

5. The control circuit for the switching mechanism as described in any one of claims 1 or 2, characterized in that, The control circuit of the switching mechanism further includes a voltage regulator circuit. The first terminal of the voltage regulator circuit is electrically connected to the controlled terminal of the first switching circuit and the first terminal of the second switching circuit, and the second terminal of the voltage regulator circuit is electrically connected to the ground terminal.

6. The control circuit for the switching mechanism as described in claim 5, characterized in that, The voltage regulator circuit includes a first capacitor and a first diode; Wherein, the first terminal of the first capacitor is electrically connected to the circuit switch power supply terminal, the controlled terminal of the first switch circuit, and the cathode of the first diode; the second terminal of the first capacitor is electrically connected to the anode and ground terminal of the first diode.

7. The control circuit for the switching mechanism as described in any one of claims 1 or 2, characterized in that, The control circuit of the switching mechanism also includes a freewheeling protection circuit. The input terminal of the freewheeling protection circuit is electrically connected to the negative power supply terminal of the motor, and the output terminal of the freewheeling protection circuit is electrically connected to the positive power supply terminal of the motor.

8. The control circuit for the switching mechanism as described in claim 7, characterized in that, The freewheeling protection circuit includes a second diode; The cathode of the second diode is electrically connected to the negative power supply terminal of the motor, and the anode of the second diode is electrically connected to the negative power supply terminal of the motor.

9. A control method for a switching mechanism, characterized in that, The control method for the switching mechanism, applied to a control circuit according to any one of claims 1 to 8, includes: Output power supply voltage to the positive power supply terminal of the motor, and control the second switching circuit to conduct the path between the circuit switching power supply terminal, the controlled terminal of the first switching circuit and the ground terminal, so as to turn off the first switching circuit; Stop supplying power voltage to the positive power terminal of the motor, and control the second switching circuit to turn off the path between the circuit switching power terminal, the controlled terminal of the first switching circuit, and the ground terminal, so that the first switching circuit can be turned on.

10. A vehicle-mounted refrigerator, characterized in that, The vehicle-mounted refrigerator includes a switching mechanism and a control circuit for the switching mechanism as described in any one of claims 1 to 8; The switching mechanism includes a locking component, a motor for unlocking the locking component, and an elastic reset component for resetting the motor drive component.

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