Double-box refrigeration switching electromagnetic valve power supply module of vehicle-mounted refrigerator
By introducing a solenoid valve switching circuit and a boost/buck voltage drive circuit into the vehicle refrigerator, a stable 16-17V voltage is output, solving the problem that the solenoid valve cannot work properly under high temperature and low voltage conditions, and ensuring the reliability of dual-box temperature control.
Patent Information
- Application Number
- CN202423278206.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2034-12-30
AI Technical Summary
In existing vehicle refrigerators, the solenoid valve cannot switch operation properly under high temperature or low voltage conditions, affecting the temperature control of the two compartments.
The system employs a solenoid valve switching circuit and a step-up/step-down drive circuit. Through step-up/step-down processing, it outputs a regulated voltage of 16-17V, ensuring that the solenoid valve can operate normally under high temperature and low voltage conditions.
It enables normal switching of the solenoid valve under high temperature and low voltage conditions, ensuring the accuracy and reliability of dual-box temperature control.
Smart Images
Figure CN223771931U_ABST
Abstract
Description
[Technical Field]
[0001] This utility model relates to a power supply module for a dual-box refrigeration switching solenoid valve of a vehicle refrigerator. [Background Technology]
[0002] In existing DC dual-compartment car refrigerators, switching between the two compartments for cooling is generally achieved using solenoid valves. To achieve dual-temperature, dual-control cooling, the solenoid valves alternately cool the two compartments. When one compartment reaches its set temperature, the solenoid valve drives the refrigerant flow to the compartment that hasn't reached its set temperature. Once both compartments reach their set temperatures, the compressor stops working, thus ceasing cooling to both compartments. Currently, the rated operating voltage of solenoid valves on the market is 12V. These valves are typically used in household refrigerators that step down from 220V to 12V DC.
[0003] However, when the car refrigerator is inside a car during the summer, the interior temperature is high without air conditioning. The compressor needs to operate under a heavy load, putting significant pressure on the refrigeration system. When the system pressure exceeds the solenoid valve's opening pressure limit, the 12V DC power supply cannot drive the solenoid valve to switch operation. Simultaneously, the voltage inside the car is 13V when the engine is running, but drops to only 11V after the car is turned off. If the battery ages after prolonged use, the voltage will be even lower after the engine is off. In such cases, the power supply voltage may also be insufficient to drive the solenoid valve to switch operation, leading to abnormal solenoid valve operation and affecting the dual-box temperature control. [Utility Model Content]
[0004] This invention overcomes the shortcomings of the prior art and provides a power supply module for a dual-box refrigeration switching solenoid valve in a vehicle refrigerator.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] A power supply module for a dual-compartment refrigeration switching solenoid valve in a vehicle refrigerator is characterized by comprising a solenoid valve switching circuit that switches the working state of the solenoid valve according to control commands, and a boost / buck drive circuit that connects to an external power source to perform boost / buck processing on the input power and outputs a regulated voltage to supply power to the solenoid valve switching circuit.
[0007] The power supply module for the dual-compartment refrigeration switching solenoid valve of a vehicle refrigerator, as described above, is characterized in that the regulated voltage range is 16-17V.
[0008] The above-described power supply module for a dual-compartment refrigeration switching solenoid valve in a vehicle refrigerator is characterized by the following: A boost / buck driving circuit includes a capacitor C14, one end of which is grounded; the other end of which is connected to an external power supply, one end of resistor R5, the emitter of transistor Q2, the positive terminal of Zener diode D1, one end of capacitor C13, one end of resistor R4, the negative terminal of Zener diode DE3, and the source terminal of MOSFET Q1; the other end of resistor R5 is connected to the base of transistor Q2 and one end of resistor R10; the other end of resistor R10 is connected to the negative terminal of Zener diode DW4, and the positive terminal of Zener diode DW4 is grounded; the collector of transistor Q2 is connected to the other end of resistor R4, the positive terminal of Zener diode DW3, the gate terminal of MOSFET Q1, and one end of resistor R13, and the other end of resistor R13 is grounded; the drain terminal of MOSFET Q1 is connected to one end of capacitor C6 and pin 5 of boost chip IC1. One end of inductor L1 is connected, and the other end of capacitor C6 is grounded. The other end of inductor L1 is connected to pin 1 of boost chip IC1, one end of capacitor C10, and the positive terminal of Zener diode D2. The other end of capacitor C10 is grounded through resistor R20. Pin 2 of boost chip IC1 is grounded. Pin 3 of boost chip IC1 is connected to one end of resistor R6 and one end of resistor R11. The other end of resistor R11 is grounded. Pin 4 of boost chip IC1 is connected to one end of resistor R9, one end of capacitor C11, and the two negative terminals of Schottky diode array D5. The other end of resistor R9 is grounded. The other end of capacitor C11 is grounded. The two positive terminals of Schottky diode array D5 are connected to the solenoid valve switching circuit. The other end of capacitor C13 is connected to the negative terminals of Zener diode D1 and D2, the other end of resistor R6, one end of capacitor C5, and the solenoid valve switching circuit. The other end of capacitor C5 is grounded.
[0009] The above-described vehicle-mounted refrigerator dual-compartment refrigeration switching solenoid valve power supply module is characterized in that: the solenoid valve switching circuit includes a switching driver Q3 and a switching driver Q4. Pin 4 of switching driver Q3 is connected to the positive terminal of Zener diode DW1, one end of resistor R7, and one end of resistor R1, respectively. The other end of resistor R7 is connected to the collector of DC converter Q5. The base of DC converter Q5 is connected to one end of resistor R12, the base of DC converter Q7, and one end of capacitor C8, respectively. The other end of resistor R12 is connected to the buck-boost driving circuit and the control circuit to receive control commands. The emitter of DC converter Q7 and the capacitor... The other end of C8 is grounded. The collector of converter Q7 is connected to the other end of resistor R16, the negative terminal of Zener diode DW5, one end of resistor R18, and pin 2 of switching driver Q3. The positive terminal of Zener diode DW5 and the other end of resistor R18 are grounded. The emitter of DC converter Q5 is connected to the positive terminal of diode D3, and the negative terminal of diode D3 is grounded. Pin 3 of switching driver Q3 is connected to one end of capacitor C1, the negative terminal of Zener diode DW1, the other end of resistor R1, pin 3 of switching driver Q4, one end of resistor R2, the negative terminal of Zener diode DW2, one end of capacitor C2, and one end of resistor R16. One end of resistor R17 is connected to the step-up / step-down drive circuit. The other ends of capacitors C1 and C2 are grounded. Pin 1 of switch driver Q3 is grounded. Pin 5 of switch driver Q3 is connected to pins 6-8 of switch driver Q3, the solenoid valve, and one end of resistor R15. The other end of resistor R15 is connected to pins 5-8 of switch driver Q4 and the solenoid valve through capacitor C7. Pin 4 of switch driver Q4 is connected to the other end of resistor R2, the positive terminal of Zener diode DW3, and one end of resistor R8. The other end of resistor R8 is connected to the collector of DC converter Q6. The base of DC converter Q6 is connected to resistor R17. One end of resistor R14 is connected to the base of DC converter Q8 and one end of capacitor C9. The other end of resistor R14 is connected to the buck-boost drive circuit and the control circuit to receive control commands. The emitter of DC converter Q8 and the other end of capacitor C9 are grounded respectively. The collector of DC converter Q8 is connected to the other end of resistor R17, the negative terminal of Zener diode DW6, one end of resistor R19, and pin 2 of switching driver Q4. The positive terminal of Zener diode DW6 and the other end of resistor R19 are grounded respectively. The emitter of DC converter Q6 is connected to the positive terminal of diode D4. The negative terminal of diode D4 is grounded. Pin 1 of switching driver Q4 is grounded.
[0010] The above-described vehicle refrigerator dual-box refrigeration switching solenoid valve power supply module is characterized in that: capacitors C3, C4 and C12 are provided between the solenoid valve switching circuit and the boost / buck driving circuit, one end of capacitor C3 is connected to one end of capacitor C4, one end of capacitor C12, the solenoid valve switching circuit and the boost / buck driving circuit respectively, and the other ends of capacitor C3, C4 and C12 are grounded respectively.
[0011] The power supply module for the dual-compartment refrigeration switching solenoid valve of the vehicle refrigerator described above is characterized in that: the solenoid valve is a solenoid valve with one input port and two output ports.
[0012] The beneficial effects of this utility model are:
[0013] This invention includes a solenoid valve switching circuit that switches the working state of the solenoid valve according to control commands, and a boost / buck drive circuit that connects to an external power supply to process the input power supply and output a regulated voltage to supply power to the solenoid valve switching circuit. By setting up the boost / buck drive circuit, the external input power supply outputs a regulated voltage of 16-17V after boost / buck processing, ensuring that the solenoid valve can be driven to switch working even in high-temperature environments and under the condition of external low-voltage power input, thereby accurately controlling the temperature of the dual chambers. [Image Description]
[0014] Figure 1 This is a schematic diagram of the present invention;
[0015] Figure 2 This is a circuit diagram of the present invention. [Detailed Implementation]
[0016] The technical solutions in the embodiments of this utility model will now be clearly and completely described in conjunction with the accompanying drawings.
[0017] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this utility model are only used to explain the relative positional relationship and movement of the components in a specific posture (as shown in the attached figure). If the specific posture changes, the directional indication will also change accordingly. Furthermore, descriptions involving "preferred," "second-best," etc., in this utility model are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined as "preferred" or "second-best" may explicitly or implicitly include at least one of those features.
[0018] like Figure 1-2 As shown, a power supply module for a dual-compartment cooling switching solenoid valve in a vehicle refrigerator includes a solenoid valve switching circuit 1 that switches the operating state of the solenoid valve according to control commands, and a boost / buck drive circuit 2 that connects to an external power source, performs boost / buck processing on the input power, and outputs a regulated voltage to supply power to the solenoid valve switching circuit 1. The solenoid valve is a solenoid valve with one input port and two output ports, and switching the operating state of the solenoid valve involves switching the output port connected to the input port.
[0019] In actual use, the external power supply typically inputs a voltage of 9.6-31.5V. This external power supply, after being stepped up and down by the boost / buck drive circuit 2, outputs a regulated 16-17V voltage to the solenoid valve switching circuit 1. When the control circuit inputs a switching command to the solenoid valve switching circuit 1, the circuit, powered by the regulated 16-17V voltage, drives the solenoid valve to switch. The other output port of the switching solenoid valve is connected to the input port, allowing refrigerant to enter the other compartment, thereby controlling its temperature. Extensive testing in this case has shown that for refrigerator loads of 25-29 liters, switching can be achieved using a 16-17V voltage to drive the solenoid valve at 55 degrees Celsius. To reduce heat generation, the switching interval was adjusted from one pulse per minute (1 second per pulse) to six pulses every five minutes, each pulse lasting 200ms. This ensures normal switching operation of the solenoid valve even in high-temperature environments and under low-voltage input power conditions.
[0020] like Figure 2 As shown, the step-up / step-down drive circuit 2, through the step-up chip IC1 and related circuits, can output a regulated voltage after step-up / step-down processing based on the voltage value input from the external power supply, and provide regulated power to the solenoid valve switching circuit 1. It also realizes reverse connection protection and filtering functions.
[0021] like Figure 2 As shown, in the solenoid valve switching circuit 1, after the control circuit inputs a control command signal, the DC converter Q5 or the DC converter Q6 is turned on, thereby causing the switching driver Q3 or the switching driver Q4 to work, thereby controlling the solenoid valve to perform switching operations.
[0022] like Figure 2 As shown, capacitors C3, C4, and C12 are provided between the solenoid valve switching circuit 1 and the buck-boost drive circuit 2. One end of capacitor C3 is connected to one end of capacitor C4, one end of capacitor C12, the solenoid valve switching circuit 1, and the buck-boost drive circuit 2, respectively. The other ends of capacitors C3, C4, and C12 are grounded. Capacitors C3, C4, and C12 stabilize the output voltage of the buck-boost drive circuit 2, reduce noise and ripple, and can quickly provide or absorb transient current changes, enabling the buck-boost drive circuit 2 to output a stable voltage to power the solenoid valve switching circuit 1.
[0023] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are included within the patent protection scope of this utility model.
Claims
1. A power supply module for a dual-compartment refrigeration switching solenoid valve in a vehicle-mounted refrigerator, characterized in that: The application relates to a solenoid valve switching circuit (1) for switching the working state of a solenoid valve according to control instructions, and a step-up and step-down driving circuit (2) for connecting with an external power supply, performing step-up and step-down treatment on input power, outputting a stabilized voltage to the solenoid valve switching circuit (1) and supplying power to the solenoid valve switching circuit (1).
2. The power supply module of the double-box refrigeration switching electromagnetic valve of the vehicle-mounted refrigerator according to claim 1, characterized in that: The stabilized voltage value ranges from 16 to 17 V.
3. The power supply module of the double-box refrigeration switching electromagnetic valve of the vehicle-mounted refrigerator according to claim 1, characterized in that: The step-up and step-down driving circuit (2) comprises a capacitor C14, one end of the capacitor C14 is grounded, the other end of the capacitor C14 is connected with an external power supply, one end of a resistor R5, an emitter of a triode Q2, a positive electrode end of a stabilized diode D1, one end of a capacitor C13, one end of a resistor R4, a negative electrode end of a stabilized diode DE3, a source electrode end of a MOS tube Q1, one end of a resistor R13, the other end of the resistor R13 is grounded, a drain electrode end of the MOS tube Q1 is connected with one end of a capacitor C6, a pin 5 of a step-up chip IC1 and one end of an inductor L1, the other end of the capacitor C6 is grounded, the other end of the inductor L1 is connected with a pin 1 of the step-up chip IC1, one end of a capacitor C10 and a positive electrode end of a stabilized diode D2, the other end of the capacitor C10 is grounded through a resistor R20, a pin 2 of the step-up chip IC1 is grounded, one end of a resistor R6 and one end of a resistor R11 are connected with a pin 3 of the step-up chip IC1, the other end of the resistor R11 is grounded, one end of a resistor R9, one end of a capacitor C11 and two negative electrode ends of a Schottky diode array D5 are connected with a pin 4 of the step-up chip IC1, the other end of the resistor R9 is grounded, the other end of the capacitor C11 is grounded, two positive electrode ends of the Schottky diode array D5 are connected with the solenoid valve switching circuit (1), the other end of the capacitor C13 is connected with a negative electrode end of the stabilized diode D1, a negative electrode end of the stabilized diode D2, the other end of the resistor R6, one end of a capacitor C5 and the solenoid valve switching circuit (1), and the other end of the capacitor C5 is grounded.
4. The power supply module of the double-box refrigeration switching electromagnetic valve of the vehicle-mounted refrigerator according to claim 1, characterized in that: The electromagnetic valve switching circuit (1) comprises switching driver Q3 and switching driver Q4, pin 4 of switching driver Q3 is connected with positive electrode end of stabilizing diode DW1, one end of resistor R7 and one end of resistor R1 respectively, the other end of resistor R7 is connected with collector of DC converter Q5, base of DC converter Q5 is connected with one end of resistor R12, base of DC converter Q7 and one end of capacitor C8 respectively, the other end of resistor R12 is connected with boost-buck driving circuit (2) and control circuit to receive control instruction, emitter of DC converter Q7 and the other end of capacitor C8 are grounded respectively, collector of DC converter Q7 is connected with the other end of resistor R16, negative electrode end of stabilizing diode DW5, one end of resistor R18, pin 2 of switching driver Q3 respectively, positive electrode end of stabilizing diode DW5 and the other end of resistor R18 are grounded respectively, emitter of DC converter Q5 is connected with positive electrode end of diode D3, negative electrode end of diode D3 is grounded, pin 3 of switching driver Q3 is connected with one end of capacitor C1, negative electrode end of stabilizing diode DW1, the other end of resistor R1, pin 3 of switching driver Q4, one end of resistor R2, negative electrode end of stabilizing diode DW2, one end of capacitor C2, one end of resistor R16, one end of resistor R17 and boost-buck driving circuit (2) respectively, the other end of capacitor C1 and the other end of capacitor C2 are grounded respectively, pin 1 of switching driver Q3 is grounded, pin 5 of switching driver Q3 is connected with pin 6-8 of switching driver Q3, electromagnetic valve and one end of resistor R15 respectively, the other end of resistor R15 is connected with pin 5-8 of switching driver Q4, electromagnetic valve through capacitor C7 respectively, pin 4 of switching driver Q4 is connected with the other end of resistor R2, positive electrode end of stabilizing diode DW3, one end of resistor R8 respectively, the other end of resistor R8 is connected with collector of DC converter Q6, base of DC converter Q6 is connected with one end of resistor R14, base of DC converter Q8 and one end of capacitor C9 respectively, the other end of resistor R14 is connected with boost-buck driving circuit (2) and control circuit to receive control instruction, emitter of DC converter Q8 and the other end of capacitor C9 are grounded respectively, collector of DC converter Q8 is connected with the other end of resistor R17, negative electrode end of stabilizing diode DW6, one end of resistor R19 and pin 2 of switching driver Q4 respectively, positive electrode end of stabilizing diode DW6 and the other end of resistor R19 are grounded respectively, emitter of DC converter Q6 is connected with positive electrode end of diode D4, negative electrode end of diode D4 is grounded, pin 1 of switching driver Q4 is grounded.
5. The power supply module of the double-box refrigeration switching electromagnetic valve of the vehicle-mounted refrigerator according to claim 1, characterized in that: Capacitor C3, capacitor C4 and capacitor C12 are arranged between electromagnetic valve switching circuit (1) and boost-buck driving circuit (2), one end of capacitor C3 is connected with one end of capacitor C4, one end of capacitor C12, electromagnetic valve switching circuit (1) and boost-buck driving circuit (2) respectively, the other end of capacitor C3, the other end of capacitor C4 and the other end of capacitor C12 are grounded respectively.
6. The power supply module of the double-box refrigeration switching electromagnetic valve of the vehicle-mounted refrigerator according to claim 1, characterized in that: The electromagnetic valve is an electromagnetic valve provided with one input port and two output ports.