Control circuit of cold and hot semiconductor refrigerator and vehicle

Abstract

The utility model provides a control circuit of a cold and hot semiconductor refrigerator and a vehicle, and relates to the technical field of circuit control, the control circuit comprises a first power supply circuit, a second power supply circuit, a charge and discharge control circuit, a storage battery and a refrigerator working state control circuit; the output end of the first power supply circuit is connected with the input end of the charging and discharging control circuit and the input end of the refrigerator working state control circuit, the input end of the charging and discharging control circuit and the input end of the refrigerator working state control circuit are further connected with the output end of the second power supply circuit, and the output end of the charging and discharging control circuit is connected with the positive electrode end of the storage battery. The negative electrode end of the storage battery and the output end of the refrigerator working state control circuit are connected with the input end of the first power supply circuit and then connected with the input end of the second power supply circuit. The high-efficiency operation of the cold and hot semiconductor refrigerator can still be maintained without an external power supply, so that the cold and hot semiconductor refrigerator can adapt to the use requirements of multiple scenes.

Description

Technical Field

[0001] This utility model relates to the technical field of circuit control, and in particular to a control circuit for a hot and cold semiconductor refrigerator and a vehicle. Background Technology

[0002] With the popularization of outdoor lifestyles such as self-driving tours and camping, car refrigerators, as cold chain storage devices in mobile scenarios, have evolved from high-end car accessories into essential tools for mobile living, becoming one of the core needs of car users. According to statistics, more than 60% of mid-to-high-end vehicle users list car refrigerators as a priority option when purchasing a car. Its application scenarios have expanded from food refrigeration to areas such as medicine preservation and constant temperature storage of baby products. Therefore, research on the control circuit of car refrigerators is of great significance.

[0003] Currently, the mainstream products on the market are semiconductor refrigerators, which meet the needs of food preservation, medicine refrigeration, and hot food warming through dual-temperature control. However, existing semiconductor refrigerators generally rely on automotive power or external power sources. When the vehicle is turned off or the external power is interrupted, the refrigerator immediately stops operating, causing the internal temperature to rise rapidly. If the temperature rises to ambient temperature within a few hours, the cooling / heating process needs to be restarted, seriously affecting the user experience and the safety of stored items. While compressor-type car refrigerators have continuous cooling capabilities, they suffer from problems such as high operating vibration, high energy consumption, and safety hazards. Although semiconductor refrigerators are safer, they lack independent energy storage modules and still face the problem of forced shutdown when there is no external power source, making them unsuitable for various usage scenarios. Summary of the Invention

[0004] To address the problem of existing technologies where hot and cold semiconductor refrigerators automatically shut down or cut off power when there is no external power source, this invention proposes a control circuit and vehicle for a hot and cold semiconductor refrigerator that can maintain efficient operation even without an external power source, making the hot and cold semiconductor refrigerator adaptable to various usage scenarios.

[0005] To achieve the above-mentioned technical effects, the technical solution of this utility model is as follows:

[0006] A control circuit for a thermoelectric refrigerator includes: a first power supply circuit, a second power supply circuit, a charge / discharge control circuit, a storage battery, and a refrigerator operating state control circuit. The output terminal of the first power supply circuit is connected to the input terminals of the charge / discharge control circuit and the refrigerator operating state control circuit, respectively. The input terminals of the charge / discharge control circuit and the refrigerator operating state control circuit are also connected to the output terminal of the second power supply circuit. The output terminal of the charge / discharge control circuit is connected to the positive terminal of the storage battery. The negative terminal of the storage battery and the output terminal of the refrigerator operating state control circuit are connected to the input terminal of the first power supply circuit, and then connected to the input terminal of the second power supply circuit.

[0007] Preferably, the first power supply circuit includes an AC power supply, an AC / DC inverter, a first current regulation circuit, and a second current regulation circuit. The positive terminal of the AC power supply is connected to the first input terminal of the AC / DC inverter. The first output terminal of the AC / DC inverter is connected to the input terminal of the first current regulation circuit. The second output terminal of the AC / DC inverter is connected to the input terminal of the second current regulation circuit. The output terminals of the first and second current regulation circuits are connected together to a charge / discharge control circuit and then to the input terminal of a refrigerator operating state control circuit. The negative terminal of the storage battery and the output terminal of the refrigerator operating state control circuit are connected to the second input terminal of the AC / DC inverter. The third output terminal of the AC / DC inverter is connected to the negative terminal of the AC power supply.

[0008] Preferably, the first current regulating circuit includes a first current branch and a second current branch connected in parallel. The first current branch includes a first capacitor C1, a first resistor R1 and a first detection element D1 connected in series. The second current branch includes a second capacitor C2, a second resistor R2 and a second detection element D2 connected in series.

[0009] Preferably, the second current regulation circuit includes a third current branch and a fourth current branch connected in parallel. The third current branch includes a third capacitor C3, a third resistor R3 and a third detection element D3 connected in series. The fourth current branch includes a fourth capacitor C4, a fourth resistor R4 and a fourth detection element D4 connected in series.

[0010] Preferably, the second power supply circuit is provided with a low-voltage DC power supply. The positive terminal of the low-voltage DC power supply is connected to the input terminal of the charging and discharging control circuit and the refrigerator operating status control circuit, respectively. The negative terminal of the low-voltage DC power supply is connected to the negative terminal of the storage battery and the output terminal of the refrigerator operating status control circuit, respectively.

[0011] Preferably, the AC power supply is 220V AC, and the low-voltage DC power supply is 12V DC.

[0012] Preferably, the charge / discharge control circuit includes a first IC detection element 8254AA, a second IC detection element 4407, a fifth capacitor C5, and a sixth capacitor C6. The input terminal of the first IC detection element 8254AA is connected to the output terminals of the first power supply circuit and the second power supply circuit, respectively. The output terminal of the first IC detection element 8254AA is connected to the input terminals of the second IC detection element 4407 and the fifth capacitor C5, respectively. The output terminal of the fifth capacitor C5 is connected to the first output terminal of the second IC detection element 4407, the input terminal of the sixth capacitor C6, and the negative terminal of the storage battery, respectively. The second output terminal of the second IC detection element 4407 and the output terminal of the sixth capacitor C6 are connected to the positive terminal of the storage battery, respectively.

[0013] Preferably, the refrigerator operating state control circuit includes a DPDT relay switch, a control module, and a fan. The input terminal of the fan and one end of the DPDT relay switch are respectively connected to the output terminal of the first power supply circuit and then to the output terminal of the second power supply circuit. The other end of the DPDT relay switch is connected to the input terminal of the control module. The output terminals of the control module and the fan are respectively connected to the input terminals of the first power supply circuit and then to the input terminals of the second power supply circuit.

[0014] Preferably, the DPDT relay switch is a three-segment power switch with a traffic light indicator.

[0015] This utility model also proposes a vehicle, including the control circuit of the hot and cold semiconductor refrigerator as described.

[0016] Compared with the prior art, the beneficial effects of this utility model's technical solution are:

[0017] This invention proposes a control circuit and vehicle for a thermoelectric refrigerator. Firstly, it employs a dual-redundancy design with a first power supply circuit and a second power supply circuit to ensure seamless switching between external power and a storage battery. Secondly, it uses a charge / discharge control circuit to intelligently manage the charging and discharging of the storage battery, automatically switching to battery power when the external power supply is interrupted. Combined with a refrigerator operating status control circuit, it maintains the continuous operation of the thermoelectric refrigerator's cooling / heating functions, ensuring its working efficiency. Furthermore, the control circuit of this invention has power self-identification and power supply mode self-switching functions, enabling the thermoelectric refrigerator to maintain efficient operation even without an external power source. This effectively expands the refrigerator's application capabilities in scenarios without a fixed power source, such as in vehicles and outdoors, meeting the reliability requirements of multiple usage scenarios. Attached Figure Description

[0018] Figure 1 This diagram shows the structure of a control circuit for a thermoelectric refrigerator according to an embodiment of the present invention.

[0019] Figure 2 This diagram illustrates the structure of a thermoelectric refrigerator based on an embodiment of the present invention.

[0020] Figure 3 A flowchart illustrating a control method for a control circuit of a hot and cold semiconductor refrigerator proposed in an embodiment of this utility model;

[0021] Figure 4 This diagram illustrates the structure of a vehicle as described in an embodiment of the present invention.

[0022] 1. First power supply circuit; 11. AC power supply; 12. AC / DC inverter; 13. First current regulation circuit; 14. Second current regulation circuit; 2. Second power supply circuit; 3. Charge / discharge control circuit; 4. Storage battery; 5. Refrigerator operating status control circuit; 51. DPDT relay switch; 52. Control module; 53. Fan; 6. Vehicle. Detailed Implementation

[0023] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent.

[0024] It is understandable to those skilled in the art that some well-known details may be omitted from the accompanying drawings;

[0025] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0026] Example 1

[0027] like Figure 1 and Figure 2 As shown, this utility model proposes a control circuit for a thermoelectric refrigerator, which can be a vehicle refrigerator or a household refrigerator. The control circuit includes: a first power supply circuit 1, a second power supply circuit 2, a charge / discharge control circuit 3, a storage battery 4, and a refrigerator operating state control circuit 5. The output terminal of the first power supply circuit 1 is connected to the input terminals of the charge / discharge control circuit 3 and the refrigerator operating state control circuit 5, respectively. The input terminals of the charge / discharge control circuit 3 and the refrigerator operating state control circuit 5 are also connected to the output terminal of the second power supply circuit 2. The output terminal of the charge / discharge control circuit 3 is connected to the positive terminal of the storage battery 4. The negative terminal of the storage battery 4 and the output terminal of the refrigerator operating state control circuit 5 are connected to the input terminal of the first power supply circuit 1, and then to the input terminal of the second power supply circuit 2.

[0028] The first power supply circuit 1 includes an AC power supply 11, an AC / DC inverter 12, a first current regulation circuit 13, and a second current regulation circuit 14. The positive terminal of the AC power supply 11 is connected to the first input terminal of the AC / DC inverter 12. The first output terminal of the AC / DC inverter 12 is connected to the input terminal of the first current regulation circuit 13. The second output terminal of the AC / DC inverter 12 is connected to the input terminal of the second current regulation circuit 14. The output terminals of the first current regulation circuit 13 and the second current regulation circuit 14 are connected together to the charge / discharge control circuit 3 and then to the input terminal of the refrigerator operating state control circuit 5. The negative terminal of the storage battery 4 and the output terminal of the refrigerator operating state control circuit 5 are connected to the second input terminal of the AC / DC inverter 12. The third output terminal of the AC / DC inverter 12 is connected to the negative terminal of the AC power supply 11.

[0029] The first current regulation circuit 13 includes a first current branch and a second current branch connected in parallel. The first current branch includes a first capacitor C1, a first resistor R1 and a first detection element D1 connected in series. The second current branch includes a second capacitor C2, a second resistor R2 and a second detection element D2 connected in series.

[0030] The second current regulation circuit 14 includes a third current branch and a fourth current branch connected in parallel. The third current branch includes a third capacitor C3, a third resistor R3 and a third detection element D3 connected in series. The fourth current branch includes a fourth capacitor C4, a fourth resistor R4 and a fourth detection element D4 connected in series.

[0031] The second power supply circuit 2 is equipped with a low-voltage DC power supply. The positive terminal of the low-voltage DC power supply is connected to the input terminal of the charging and discharging control circuit 3 and the refrigerator working state control circuit 5, respectively. The negative terminal of the low-voltage DC power supply is connected to the negative terminal of the storage battery 4 and the output terminal of the refrigerator working state control circuit 5, respectively.

[0032] The AC power supply 11 is 220V AC, and the low-voltage DC power supply is 12V DC.

[0033] The charge / discharge control circuit 3 includes a first IC detection element 8254AA, a second IC detection element 4407, a fifth capacitor C5, and a sixth capacitor C6. The input terminal of the first IC detection element 8254AA is connected to the output terminals of the first power supply circuit 1 and the second power supply circuit 2, respectively. The output terminal of the first IC detection element 8254AA is connected to the input terminals of the second IC detection element 4407 and the fifth capacitor C5, respectively. The output terminal of the fifth capacitor C5 is connected to the first output terminal of the second IC detection element 4407, the input terminal of the sixth capacitor C6, and the negative terminal of the storage battery 4, respectively. The second output terminal of the second IC detection element 4407 and the output terminal of the sixth capacitor C6 are connected to the positive terminal of the storage battery 4, respectively.

[0034] The refrigerator operating status control circuit 5 includes a DPDT relay switch 51, a control module 52, and a fan 53. The input terminal of the fan 53 and one end of the DPDT relay switch 51 are respectively connected to the output terminal of the first power supply circuit 1 and then to the output terminal of the second power supply circuit 2. The other end of the DPDT relay switch 51 is connected to the input terminal of the control module 52. The output terminals of the control module 52 and the fan 53 are respectively connected to the input terminals of the first power supply circuit 1 and then to the input terminals of the second power supply circuit 2.

[0035] The working principle of the control circuit of the aforementioned hot and cold semiconductor refrigerator is as follows:

[0036] First, when the aforementioned hot and cold semiconductor refrigerator is used for the first time, or after a long period of inactivity, the first power supply circuit 1 is connected to 220V AC power. The 220V AC power then enters the AC / DC inverter, which converts the 220V AC power into 12V DC power. The 12V DC power then enters the respective current branches of the first current regulation circuit 13 and the second current regulation circuit 14. In the first current branch, the 12V DC power is first filtered by the first capacitor C1, then regulated by the first resistor R1, and finally detected by the first detection element D1. In the second current branch, the 12V DC current is first filtered by the second capacitor C2, then regulated by the second resistor R2, and finally detected by the second detection element D2. In the third current branch, the 12V DC current is first filtered by the third capacitor C3, then regulated by the third resistor R3, and finally detected by the third detection element D3. In the fourth current branch, the 12V DC current is first filtered by the fourth capacitor C4, then regulated by the fourth resistor R4, and finally detected by the fourth detection element D4. The currents from the four circuit branches converge to form a DC current of 12V 5A. The 5A DC power enters the shunt circuit. One path goes directly to the fan 53, and the other goes to the DPDT relay 51 switch. The DPDT relay switch is a three-position power switch with red and green indicator lights. To make the thermoelectric refrigerator cool, the DPDT relay switch with the green light is turned on, and the control module 52 controls the fan 53 to run and the thermoelectric refrigerator to start cooling. The generated heat is dissipated by the fan. The other path is detected by the first IC detection element 8254AA and enters the second IC detection element 4407. A voltage difference or current difference is generated between the fifth capacitor C5 and the sixth capacitor C6 on both sides, causing the storage battery 4 to have two states: First, when the second IC detection element 4407 detects that the voltage or current near the storage battery 4 is less than the voltage or current near the first IC detection element 8254AA, the storage battery 4 starts charging. Second, when the current or voltage near the storage battery 4 is equal to the current or voltage near the first IC detection element 8254AA, it indicates that the storage battery 4 is fully charged and the storage battery 4 is in a protection state. This determines whether battery 4 is in a charging or protection state. When battery 4 is in protection state, the first IC detection element 8254AA responds to the protection status of battery 4, ensuring the safety of battery 4.

[0037] When the second power supply circuit 2 in the control circuit of the aforementioned hot and cold semiconductor refrigerator is connected to DC 12V, the DC 12V begins to flow into the fan and the DPDT relay switch respectively. Depending on the user's refrigerator usage needs, it can be connected to the DPDT relay switch for cooling, heating, or shutdown. Another DC 12V power supply will flow into the second IC detection element 4407 after being detected by the first IC detection element 8254AA. This generates a voltage difference or current difference between the fifth capacitor C5 and the sixth capacitor C6 on both sides, causing the storage battery 4 to experience two situations: First, when the voltage or current near the storage battery 4 is less than the voltage or current near the first IC detection element 8254AA, the storage battery 4 begins to charge; second, when the current or voltage near the storage battery 4 is equal to the current or voltage near the first IC detection element 8254AA, it indicates that the battery is fully charged and is in a protected state.

[0038] Even when both the first and second power supply circuits are disconnected (i.e., there is no external power supply), the fan 53 will still operate. Similarly, the DPDT relay switch will operate under the control of the control module when in cooling or heating mode. This is because the first IC detection element 8254AA and the second IC detection element 4407, together with the storage battery 4, form a powered circuit. The second IC detection element 4407 detects the voltage and current of the fifth capacitor C5 and the sixth capacitor C6 on both sides. When the voltage or current near the storage battery 4 is greater than the voltage or current near the first IC detection element 8254AA, the storage battery 4 is in a discharging state. When the voltage and current of the fifth capacitor C5 and the sixth capacitor C6 on both sides reach equilibrium, the first IC detection element 8254AA and the second IC detection element 4407 will respond to the over-discharge protection function of the storage battery 4, and the storage battery 4 will stop supplying power. Therefore, the operation of the cooling and heating semiconductor refrigerator will cease.

[0039] The control circuit design of this type of thermoelectric refrigerator is simple, practical, and inexpensive, making it suitable for use in vehicle or home thermoelectric refrigerators. It can prevent food from spoiling when there is no external power source and make life more convenient for people.

[0040] The control circuit of the thermoelectric refrigerator proposed in this embodiment starts charging the storage battery 4 during normal operation and has overvoltage and overcurrent protection functions. It can also detect when there is no power in the circuit and replenish the power required for cooling / heating in a timely manner. This feature is different from the existing refrigerator control circuit, which requires software and background data to keep the refrigerator working. The existing refrigerator control circuit is relatively expensive to implement. However, the control circuit of the thermoelectric refrigerator proposed in this embodiment can realize the charging of the storage battery 4 during operation by using the charging and discharging control circuit 3 composed of the first IC detection element 8254AA, the second IC detection element 4407, the fifth capacitor C5 and the sixth capacitor C6. It can also protect the storage battery 4 from overvoltage and overload, and can also prevent overcharging and over-discharging. Moreover, when the external power supply fails to provide power to the control circuit of the thermoelectric refrigerator in time, the storage battery 4 can be used as a power source. This is because the second IC detection element 4407 has a fifth capacitor C5 and a sixth capacitor C6 on both sides. The two sides continuously compare the changes in circuit voltage or current, and when the voltage is low on one side, power is applied to that side. In this way, the thermoelectric refrigerator can still maintain efficient operation even without an external power supply.

[0041] The control circuit for the thermoelectric refrigerator proposed in this embodiment is applied to a vehicle-mounted home thermoelectric refrigerator. Besides converting AC 220V to DC 12V, it can also utilize the car's DC 12V power supply as its operating power source. This solves the problem of limited space at home preventing the installation of a large refrigerator, making it suitable for use in a car and providing hot / cold drinks or ensuring food is stored at optimal temperatures while traveling. It is also worth noting that this embodiment employs a dual-redundancy design with a first and second power supply circuit to ensure seamless switching between the external power supply and the storage battery. Secondly, the charging and discharging control circuit intelligently manages the battery's charging and discharging, automatically switching to battery power when the external power supply is interrupted. Combined with the refrigerator's operating status control circuit, this maintains the continuous operation of the thermoelectric refrigerator's cooling / heating functions, ensuring its working efficiency. Furthermore, the control circuit of this invention has power self-identification and power supply mode self-switching functions, maintaining efficient operation of the thermoelectric refrigerator even without an external power source. This effectively expands the refrigerator's application capabilities in scenarios without a fixed power supply, such as in vehicles and outdoors, meeting the reliability requirements of multiple usage scenarios.

[0042] Example 2

[0043] See Figure 2 The control circuit of the hot and cold semiconductor refrigerator proposed in the above embodiment operates using the following control method, which includes the following steps:

[0044] S1. Power is supplied to the charging and discharging control circuit 3 and the refrigerator working status control circuit 5 through the first power supply circuit 1 or the second power supply circuit 2.

[0045] S2. The charge / discharge control circuit 3 monitors the voltage or current parameters of the storage battery 4 in real time, controls the charging state of the storage battery 4 according to the voltage or current parameters, and switches the cooling / heating function of the semiconductor refrigerator through the refrigerator working state control circuit 5; S3. The power supply status of the first power supply circuit 1 or the second power supply circuit 2 is continuously detected. When it is detected that the power supply of the first power supply circuit 1 or the second power supply circuit 2 is interrupted, S4 is executed; otherwise, return to S2; S4. The charge / discharge control circuit 3 controls the discharge state of the storage battery 4 and supplies power to the refrigerator working state control circuit 5, so that the refrigerator working state control circuit 5 maintains the operation of the semiconductor refrigerator until the charge / discharge control circuit 3 detects that the voltage or current parameters of the storage battery 4 have reached the cutoff threshold.

[0046] In this embodiment, a dual-redundancy design of the first and second power supply circuits is first adopted to ensure seamless switching between the external power supply and the storage battery. Secondly, the charging and discharging control circuit performs intelligent charging and discharging management of the storage battery, automatically switching to battery power supply when the external power supply is interrupted. Combined with the refrigerator working status control circuit, the cooling / heating function of the thermoelectric refrigerator is maintained continuously, ensuring the working efficiency of the thermoelectric refrigerator. Furthermore, the control circuit of this utility model has the functions of power supply self-identification and power supply mode self-switching, which can still maintain the efficient operation of the thermoelectric refrigerator in the absence of external power supply, effectively expanding the application capability of the refrigerator in scenarios without fixed power supply such as vehicle and outdoor, and meeting the reliability requirements of multi-scenario use. The control method of the control circuit of the cold and hot semiconductor refrigerator proposed in this embodiment also has the following advantages: 1) The use of multiple power supply modes improves the reliability of system power supply and ensures the circuit control function under extreme conditions; 2) Real-time monitoring of battery parameters enables precise charging and discharging control, effectively extending battery life and preventing overcharging and over-discharging; 3) Intelligent switching of cooling / heating functions optimizes the energy efficiency ratio and improves temperature regulation efficiency; 4) Automatic switching to backup power supply to maintain operation when external power supply is interrupted, combined with the battery cut-off protection mechanism, ensures the safety of refrigerated items and avoids damage from deep battery discharge, thus enhancing the emergency endurance and energy utilization efficiency of the equipment as a whole, and exhibiting significant energy-saving and environmentally friendly characteristics.

[0047] Example 3

[0048] See Figure 3 This embodiment also proposes a vehicle 6, including the control circuit of the hot and cold semiconductor refrigerator as described in the above embodiment. Figure 3(Not marked in the text) The control circuit includes: a first power supply circuit 1, a second power supply circuit 2, a charge / discharge control circuit 3, a storage battery 4, and a refrigerator operating state control circuit 5; the output terminal of the first power supply circuit 1 is connected to the input terminals of the charge / discharge control circuit 3 and the refrigerator operating state control circuit 5 respectively, the input terminals of the charge / discharge control circuit 3 and the refrigerator operating state control circuit 5 are also connected to the output terminal of the second power supply circuit 2, the output terminal of the charge / discharge control circuit 3 is connected to the positive terminal of the storage battery 4, and the negative terminal of the storage battery 4 and the output terminal of the refrigerator operating state control circuit 5 are connected to the input terminal of the first power supply circuit 1, and then connected to the input terminal of the second power supply circuit 2.

[0049] In this embodiment, a dual-redundancy design of the first and second power supply circuits is first adopted to ensure seamless switching between the external power supply and the storage battery. Secondly, the charging and discharging control circuit performs intelligent charging and discharging management of the storage battery, automatically switching to battery power supply when the external power supply is interrupted. Combined with the refrigerator working status control circuit, the cooling / heating function of the thermoelectric refrigerator is maintained continuously, ensuring the working efficiency of the thermoelectric refrigerator. Furthermore, the control circuit of this utility model has the functions of power supply self-identification and power supply mode self-switching, which can still maintain the efficient operation of the thermoelectric refrigerator in the absence of external power supply, effectively expanding the application capability of the refrigerator in scenarios without fixed power supply such as vehicle and outdoor, and meeting the reliability requirements of multi-scenario use.

[0050] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A control circuit for a hot and cold semiconductor refrigerator, characterized in that, include: The circuit consists of a first power supply circuit (1), a second power supply circuit (2), a charge / discharge control circuit (3), a storage battery (4), and a refrigerator operating status control circuit (5). The output of the first power supply circuit (1) is connected to the input of the charge / discharge control circuit (3) and the refrigerator operating status control circuit (5). The input of the charge / discharge control circuit (3) and the refrigerator operating status control circuit (5) is also connected to the output of the second power supply circuit (2). The output of the charge / discharge control circuit (3) is connected to the positive terminal of the storage battery (4). The negative terminal of the storage battery (4) and the output of the refrigerator operating status control circuit (5) are connected to the input of the first power supply circuit (1) and then to the input of the second power supply circuit (2).

2. The control circuit of the hot and cold semiconductor refrigerator according to claim 1, characterized in that, The first power supply circuit (1) includes an AC power supply (11), an AC / DC inverter (12), a first current regulation circuit (13), and a second current regulation circuit (14). The positive terminal of the AC power supply (11) is connected to the first input terminal of the AC / DC inverter (12). The first output terminal of the AC / DC inverter (12) is connected to the input terminal of the first current regulation circuit (13). The second output terminal of the AC / DC inverter (12) is connected to the input terminal of the second current regulation circuit (14). The output terminals of the first current regulation circuit (13) and the second current regulation circuit (14) are connected together to the charge / discharge control circuit (3) and then to the input terminal of the refrigerator working state control circuit (5). The negative terminal of the storage battery (4) and the output terminal of the refrigerator working state control circuit (5) are connected to the second input terminal of the AC / DC inverter (12). The third output terminal of the AC / DC inverter (12) is connected to the negative terminal of the AC power supply (11).

3. The control circuit for the hot and cold semiconductor refrigerator according to claim 2, characterized in that, The first current regulation circuit (13) includes a first current branch and a second current branch connected in parallel. The first current branch includes a first capacitor C1, a first resistor R1 and a first detection element D1 connected in series. The second current branch includes a second capacitor C2, a second resistor R2 and a second detection element D2 connected in series.

4. The control circuit of the hot and cold semiconductor refrigerator according to claim 3, characterized in that, The second current regulation circuit (14) includes a third current branch and a fourth current branch connected in parallel. The third current branch includes a third capacitor C3, a third resistor R3 and a third detection element D3 connected in series. The fourth current branch includes a fourth capacitor C4, a fourth resistor R4 and a fourth detection element D4 connected in series.

5. The control circuit of the hot and cold semiconductor refrigerator according to claim 4, characterized in that, The second power supply circuit (2) is equipped with a low-voltage DC power supply. The positive terminal of the low-voltage DC power supply is connected to the input terminal of the charging and discharging control circuit (3) and the refrigerator working state control circuit (5), respectively. The negative terminal of the low-voltage DC power supply is connected to the negative terminal of the storage battery (4) and the output terminal of the refrigerator working state control circuit (5), respectively.

6. The control circuit of the hot and cold semiconductor refrigerator according to claim 5, characterized in that, The AC power supply (11) is 220V AC power, and the low-voltage DC power supply is 12V DC power.

7. The control circuit of the hot and cold semiconductor refrigerator according to claim 1, characterized in that, The charge / discharge control circuit (3) includes a first IC detection element 8254AA, a second IC detection element 4407, a fifth capacitor C5, and a sixth capacitor C6. The input terminal of the first IC detection element 8254AA is connected to the output terminals of the first power supply circuit (1) and the second power supply circuit (2), respectively. The output terminal of the first IC detection element 8254AA is connected to the input terminals of the second IC detection element 4407 and the fifth capacitor C5, respectively. The output terminal of the fifth capacitor C5 is connected to the first output terminal of the second IC detection element 4407, the input terminal of the sixth capacitor C6, and the negative terminal of the storage battery (4), respectively. The second output terminal of the second IC detection element 4407 and the output terminal of the sixth capacitor C6 are connected to the positive terminal of the storage battery (4), respectively.

8. The control circuit of the hot and cold semiconductor refrigerator according to claim 1, characterized in that, The refrigerator working state control circuit (5) includes a DPDT relay switch (51), a control module (52) and a fan (53). The input end of the fan (53) and one end of the DPDT relay switch (51) are respectively connected to the output end of the first power supply circuit (1) and then connected to the output end of the second power supply circuit (2). The other end of the DPDT relay switch (51) is connected to the input end of the control module (52). The output ends of the control module (52) and the fan (53) are respectively connected to the input end of the first power supply circuit (1) and then connected to the input end of the second power supply circuit (2).

9. The control circuit of the hot and cold semiconductor refrigerator according to claim 8, characterized in that, The DPDT relay switch (51) is a three-segment power switch with red and green light display.

10. A vehicle, characterized in that, The control circuit of the hot and cold semiconductor refrigerator as described in any one of claims 1-9 is included.

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