Control circuit and control method of cold and hot semiconductor refrigerator and vehicle

Abstract

The invention provides a control circuit and control method 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 efficient 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 is adaptive to multi-scene use requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit control, and in particular to a control circuit, a control method and a vehicle for a hot and cold semiconductor refrigerator. Background Art

[0002] With the popularity 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 auto accessories to essential tools for mobile life, 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 buying a car. Its application scenarios extend from food refrigeration to drug preservation, constant temperature storage of maternal and child products and other fields. Therefore, research on the control circuit of car refrigerators is of great significance.

[0003] At present, the mainstream products on the market are mainly semiconductor electronic refrigerators, which meet the needs of food preservation, medicine refrigeration and hot food insulation through hot and cold dual temperature control. However, existing semiconductor refrigerators generally rely on car power or external power supply. When the vehicle is turned off or the external power is cut off, the refrigerator stops running immediately, causing the temperature inside the box to rise rapidly. If it rises to the ambient temperature within a few hours, the cooling / heating program needs to be restarted, which seriously affects the user experience and the safety of item storage. Although compressor-type car refrigerators have continuous cooling capabilities, they have problems such as large 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 supply, making them unable to adapt to the needs of multiple scenarios. Summary of the invention

[0004] In order to solve the problem of the above-mentioned prior art that the hot and cold semiconductor refrigerator automatically shuts down or cuts off the power when there is no external power supply, the present invention proposes a control circuit, a control method and a vehicle for a hot and cold semiconductor refrigerator, which can maintain the efficient operation of the hot and cold semiconductor refrigerator in the absence of an external power supply, so that the hot and cold semiconductor refrigerator can adapt to the usage requirements of multiple scenarios.

[0005] In order to achieve the above technical effects, the technical solution of the present invention is as follows: A control circuit for a hot and cold semiconductor refrigerator 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 respectively connected to the input ends of the charge and discharge control circuit and the refrigerator working state control circuit, the input ends of the charge and discharge control circuit and the refrigerator working state control circuit are also connected to the output end of the second power supply circuit, the output end of the charge and discharge control circuit is connected to the positive end of the storage battery, the negative end of the storage battery and the output end of the refrigerator working state control circuit are connected to the input end of the first power supply circuit, and then connected to the input end of the second power supply circuit.

[0006] Preferably, the first power supply circuit includes an AC power supply, an AC / DC inverter, a first current regulating circuit and a second current regulating 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 regulating circuit, the second output terminal of the AC / DC inverter is connected to the input terminal of the second current regulating circuit, the output terminal of the first current regulating circuit and the output terminal of the second current regulating circuit are connected to the charge and discharge control circuit, and are also connected to the input terminal of the refrigerator working state control circuit, the negative terminal of the storage battery and the output terminal of the refrigerator working state control circuit are connected to the second input terminal of the AC / DC inverter, and the third output terminal of the AC / DC inverter is connected to the negative terminal of the AC power supply.

[0007] 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 in sequence, and the second current branch includes a second capacitor C2, a second resistor R2 and a second detection element D2 connected in series in sequence.

[0008] Preferably, the second current regulating 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 in sequence, and the fourth current branch includes a fourth capacitor C4, a fourth resistor R4 and a fourth detection element D4 connected in series in sequence.

[0009] 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 respectively connected to the input terminal of the charge and discharge control circuit and the refrigerator working state control circuit, and the negative terminal of the low-voltage DC power supply is respectively connected to the negative terminal of the storage battery and the output terminal of the refrigerator working state control circuit.

[0010] Preferably, the AC power supply is 220V AC power, and the low-voltage DC power supply is 12V DC power.

[0011] Preferably, the charge and 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 end of the first IC detection element 8254AA is respectively connected to the output ends of the first power supply circuit and the second power supply circuit, the output end of the first IC detection element 8254AA is respectively connected to the second IC detection element 4407 and the input end of the fifth capacitor C5, the output end of the fifth capacitor C5 is respectively connected to the first output end of the second IC detection element 4407, the input end of the sixth capacitor C6 and the negative terminal of the storage battery, and the second output end of the second IC detection element 4407 and the output end of the sixth capacitor C6 are respectively connected to the positive terminal of the storage battery.

[0012] Preferably, the refrigerator working state control circuit includes a DPDT relay switch, a control module and a fan, the input end of the fan and one end of the DPDT relay switch are respectively connected to the output end of the first power supply circuit, and are also connected to the output end of the second power supply circuit, the other end of the DPDT relay switch is connected to the input end of the control module, and the output ends of the control module and the fan are respectively connected to the input end of the first power supply circuit, and are also connected to the input end of the second power supply circuit.

[0013] The present invention also proposes a control method for a control circuit of a cold and hot semiconductor refrigerator, which is characterized by comprising the following steps: S1, supplying power to the charge and discharge control circuit and the refrigerator working state control circuit through the first power supply circuit or the second power supply circuit; S2. The charge and discharge control circuit monitors the voltage or current parameters of the battery in real time, controls the charging state of the battery according to the voltage or current parameters, and switches the cooling / heating function of the semiconductor refrigerator through the refrigerator working state control circuit; S3. Continuously detect the power supply state of the first power supply circuit or the second power supply circuit. When it is detected that the power supply of the first power supply circuit or the second power supply circuit is interrupted, execute S4; otherwise, return to S2; S4. Control the discharge state of the battery through the charge and discharge control circuit, supply power to the refrigerator working state control circuit, so that the refrigerator working state control circuit maintains the operation of the semiconductor refrigerator until the charge and discharge control circuit detects that the voltage or current parameter of the battery reaches the cut-off threshold.

[0014] The present invention also provides a vehicle, comprising a control circuit of the cold and hot semiconductor refrigerator.

[0015] Compared with the prior art, the technical solution of the present invention has the following beneficial effects: The present invention proposes a control circuit, a control method and a vehicle for a hot and cold semiconductor refrigerator. First, a dual-path redundant design of a first power supply circuit and a second power supply circuit is adopted to ensure seamless switching between an external power supply and a storage battery. Secondly, the storage battery is intelligently charged and discharged through a charge and discharge control circuit, and automatically switches to battery power supply when the external power supply is interrupted. In combination with a refrigerator working state control circuit, the cooling / heating functions of the hot and cold semiconductor refrigerator are maintained to continue to operate, thereby ensuring the working efficiency of the hot and cold semiconductor refrigerator. Furthermore, the control circuit of the present invention has the functions of self-identification of power supply and self-switching of power supply modes, and can maintain the efficient operation of the hot and cold semiconductor refrigerator in the absence of an external power supply, effectively expanding the application capabilities of the refrigerator in scenarios without a fixed power supply, such as in-vehicle and outdoor, and meeting the reliability requirements of use in multiple scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A structural diagram showing a control circuit of a cold and hot semiconductor refrigerator proposed in an embodiment of the present invention; Figure 2 A structural diagram showing a hot and cold semiconductor refrigerator proposed in an embodiment of the present invention; Figure 3 A flowchart showing a control method of a control circuit of a cold and hot semiconductor refrigerator proposed in an embodiment of the present invention; Figure 4 A structural diagram of a vehicle proposed in an embodiment of the present invention is shown.

[0017] 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 and discharge control circuit; 4. Storage battery; 5. Refrigerator working state control circuit; 51. DPDT relay switch; 52. Control module; 53. Fan; 6. Vehicle. DETAILED DESCRIPTION

[0018] The drawings are for illustrative purposes only and should not be construed as limiting the present patent; It is understandable to those skilled in the art that some well-known contents may be omitted in the drawings; The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0019] Example 1 like Figure 1 and Figure 2 As shown, the present invention proposes a control circuit for a hot and cold semiconductor refrigerator, which is a vehicle-mounted refrigerator or a household refrigerator. The control circuit includes: a first power supply circuit 1, a second power supply circuit 2, a charge and discharge control circuit 3, a storage battery 4 and a refrigerator working state control circuit 5; the output end of the first power supply circuit 1 is respectively connected to the input end of the charge and discharge control circuit 3 and the refrigerator working state control circuit 5, the input end of the charge and discharge control circuit 3 and the refrigerator working state control circuit 5 are also connected to the output end of the second power supply circuit 2, the output end of the charge and discharge control circuit 3 is connected to the positive end of the storage battery 4, the negative end of the storage battery 4 and the output end of the refrigerator working state control circuit 5 are connected to the input end of the first power supply circuit 1, and are also connected to the input end of the second power supply circuit 2.

[0020] The first power supply circuit 1 includes an AC power supply 11, an AC / DC inverter 12, a first current regulating circuit 13 and a second current regulating 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 regulating circuit 13, the second output terminal of the AC / DC inverter 12 is connected to the input terminal of the second current regulating circuit 14, the output terminal of the first current regulating circuit 13 and the output terminal of the second current regulating circuit 14 are connected to the charge and discharge control circuit 3, and are also connected 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, and the third output terminal of the AC / DC inverter 12 is connected to the negative terminal of the AC power supply 11.

[0021] The first current regulating 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 in sequence. The second current branch includes a second capacitor C2, a second resistor R2 and a second detection element D2 connected in series in sequence.

[0022] The second current regulating 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 in sequence, and the fourth current branch includes a fourth capacitor C4, a fourth resistor R4 and a fourth detection element D4 connected in series in sequence.

[0023] The second power supply circuit 2 is provided with a low-voltage DC power supply, the positive terminal of the low-voltage DC power supply is respectively connected to the input terminal of the charge and discharge control circuit 3 and the refrigerator working state control circuit 5, and the negative terminal of the low-voltage DC power supply is respectively connected to the negative terminal of the storage battery 4 and the output terminal of the refrigerator working state control circuit 5.

[0024] The AC power supply 11 is 220V AC power, and the low-voltage DC power supply is 12V DC power.

[0025] The charge and 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 end of the first IC detection element 8254AA is respectively connected to the output end of the first power supply circuit 1 and the second power supply circuit 2, the output end of the first IC detection element 8254AA is respectively connected to the second IC detection element 4407 and the input end of the fifth capacitor C5, the output end of the fifth capacitor C5 is respectively connected to the first output end of the second IC detection element 4407, the input end of the sixth capacitor C6 and the negative terminal of the storage battery 4, and the second output end of the second IC detection element 4407 and the output end of the sixth capacitor C6 are respectively connected to the positive terminal of the storage battery 4.

[0026] 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 are also 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 are also connected to the input end of the second power supply circuit 2.

[0027] The working principle of the control circuit of the hot and cold semiconductor refrigerator is as follows: First, when the hot and cold semiconductor refrigerator is used for the first time, or has not been used for a long time and is now used, the first power supply circuit 1 is connected to 220V AC, and the 220V AC begins to enter the AC / DC inverter, and the AC / DC inverter converts the 220V AC into 12V DC, and the 12V DC enters each current branch in the first current regulating circuit 13 and the second current regulating circuit 14 respectively. In the first current branch, the 12V DC is first filtered by the first capacitor C1, and then adjusted by the first resistor R1 and detected by the first detection element D1. In the second current branch, the 12V DC is first filtered by the second capacitor C2, and then adjusted by the second resistor R2 to detect the current by the second detection element D2; in the third current branch, the 12V DC is first filtered by the third capacitor C3, and then adjusted by the third resistor R3 to detect the current by the third detection element D3; in the fourth current branch, the 12V DC is first filtered by the fourth capacitor C4, and then adjusted by the fourth resistor R4 to detect the current by the fourth detection element D4; the currents of the four circuit branches converge to form a voltage of DC12V 5A direct current and DC12V 5A direct current enter the shunt circuit respectively, one way directly enters the fan 53, and the other way comes to the DPDT relay 51 switch. The DPDT relay switch is a three-stage power switch with a red and green light display. If the hot and cold semiconductor refrigerator is to be refrigerated, the DPDT relay switch with a green light is turned on, and the control module 52 controls the fan 53 to run and the hot and cold semiconductor refrigerator to start refrigeration. The generated heat is dissipated by the fan; the other way is detected by the first IC detection element 8254AA, enters the second IC detection element 4407, and generates a voltage difference or a current difference through the fifth capacitor C5 and the sixth capacitor C6 on both sides, so that the storage battery 4 has two situations: the first situation is that when the second IC detection element 4407 detects that the voltage or current near the storage battery 4 side is less than the voltage or current near the first IC detection element 8254AA, the storage battery 4 starts to charge; the second situation is when the current or voltage near the storage battery 4 side 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. In this way, it can be determined whether the storage battery 4 is in the charging state or the protection state. When the storage battery 4 is in the protection state, the first IC detection element 8254AA responds to the protection state of the storage battery 4 to ensure the safety of the storage battery 4.

[0028] When the second power supply circuit 2 in the control circuit of the hot and cold semiconductor refrigerator is connected to DC12V, the DC12V begins to enter the fan and DPDT relay switch respectively, and can be connected to the cooling, heating, or shutdown state of the DPDT relay switch according to the user's refrigerator usage requirements; the other DC12V will enter the first IC detection element 8254AA for detection, enter the second IC detection element 4407, and generate a voltage difference or a current difference through the fifth capacitor C5 and the sixth capacitor C6 on both sides, so that the storage battery 4 has two situations: the first situation is that when the voltage or current close to the storage battery 4 side is less than the voltage or current close to the first IC detection element 8254AA, the storage battery 4 starts to charge; the second situation is when the current or voltage close to the storage battery 4 side is equal to the current or voltage close to the first IC detection element 8254AA, indicating that the battery is fully charged and the battery is in a protection state.

[0029] When the first power supply circuit and the second power supply circuit are both in the disconnected state, that is, when there is no external power supply, the fan 53 will still work, such as when the DPDT relay switch is under the control of the control module and is in cooling or heating, it will also work. Because the first IC detection element 8254AA and the second IC detection element 4407 in the circuit form a circuit with power supply with the storage battery 4, it detects the voltage and current of the fifth capacitor C5 and the sixth capacitor C6 on both sides through the second IC detection element 4407. At this time, when the voltage or current close to the storage battery 4 side is greater than the voltage or current close to the first IC detection element 8254AA, the storage battery 4 is in a discharge state. For example, when the second IC detection element 4407 detects that the voltage and current of the fifth capacitor C5 and the sixth capacitor C6 on both sides are balanced, 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 stops supplying power. Therefore, the operation of the cold and hot semiconductor refrigerator ends.

[0030] The control circuit design of this hot and cold semiconductor refrigerator is simple and practical, and the cost is not high. Therefore, it is more suitable for use in car-mounted or household hot and cold semiconductor refrigerators. It can solve the problem of food in the refrigerator not spoiling when there is no external power supply, and can facilitate people's lives.

[0031] The control circuit of the hot and cold semiconductor refrigerator proposed in this embodiment starts to charge the storage battery 4 during normal operation, and has overvoltage protection and overcurrent protection functions. When there is no power in the monitoring circuit, the power required for cooling / heating of the control circuit of the hot and cold semiconductor refrigerator of this embodiment can be replenished in time. This feature is different from the feature of the existing refrigerator control circuit that requires the use of software and background data to complete the continued operation of the refrigerator. The cost of implementing the existing refrigerator control circuit is relatively high. The control circuit of the hot and cold semiconductor refrigerator proposed in this embodiment can realize the refrigerator charging the storage battery 4 during operation through the charge and discharge 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, and can protect the storage battery 4 from being affected by overvoltage and overload, and can achieve the function of preventing overcharging and over-discharging. Moreover, when the external power supply fails to provide power to the control circuit of the hot and cold semiconductor refrigerator in time, the storage battery 4 can be used as a power supply. This is because the fifth capacitor C5 and the sixth capacitor C6 cooperate on both sides of the second IC detection element 4407. The two sides continuously compare the changes in circuit voltage or current. When the side with a lower voltage is found, power is added to that side. In this way, the hot and cold semiconductor refrigerator can still operate efficiently without an external power supply.

[0032] The control circuit of the cold and hot semiconductor refrigerator proposed in this embodiment is applied to the cold / hot semiconductor refrigerator for car use. In addition to converting AC 220V into DC 12V, the car power supply DC12V can also be used as the working power supply. In addition to solving the problem that a large refrigerator cannot be placed at home due to small space, it can also be suitable for use in the car, so that people can have cold / hot water to drink when traveling or ensure that food is kept at the optimal temperature. It should also be specially stated that this embodiment first adopts a dual-path redundant design of the first power supply circuit and the second power supply circuit to ensure seamless switching between the external power supply and the storage battery; secondly, the storage battery is intelligently charged and discharged through the charge and discharge control circuit, and automatically switches to the storage battery for power supply when the external power supply is interrupted, and combined with the refrigerator working state control circuit, the cold and hot semiconductor refrigerator refrigeration / heating function is maintained to continue to operate, ensuring the working efficiency of the cold and hot semiconductor refrigerator. Further, the control circuit of the present invention has the functions of self-identification of power supply and self-switching of power supply mode, and can still maintain the efficient operation of the cold and hot semiconductor refrigerator in the absence of external power supply, effectively expanding the application ability of the refrigerator in scenes without fixed power supply such as car and outdoor, and meeting the reliability requirements of multi-scene use.

[0033] Example 2 See also Figure 2 This embodiment proposes a control method for a control circuit of a cold and hot semiconductor refrigerator, comprising the following steps: S1, supplying power to the charge and discharge control circuit 3 and the refrigerator working state control circuit 5 through the first power supply circuit 1 or the second power supply circuit 2; S2. The charge and 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. Continuously detect the power supply state of the first power supply circuit 1 or the second power supply circuit 2. When it is detected that the power supply of the first power supply circuit 1 or the second power supply circuit 2 is interrupted, execute S4; otherwise, return to S2; S4. Control the discharge state of the storage battery 4 through the charge and discharge control circuit 3, and supply 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 and discharge control circuit 3 detects that the voltage or current parameter of the storage battery 4 reaches the cut-off threshold.

[0034] In this embodiment, firstly, a dual-path redundant design of the first power supply circuit and the second power supply circuit is adopted to ensure seamless switching between the external power supply and the storage battery; secondly, the storage battery is intelligently charged and discharged by the charge and discharge control circuit, and automatically switches to the storage battery for power supply when the external power supply is interrupted, and combined with the refrigerator working state control circuit, the cooling / heating function of the cold and hot semiconductor refrigerator is maintained to continue to operate, thereby ensuring the working efficiency of the cold and hot semiconductor refrigerator. Furthermore, the control circuit of the present invention has the functions of self-identification of power supply and self-switching of power supply mode, and can maintain the efficient operation of the cold and hot semiconductor refrigerator in the absence of an external power supply, effectively expanding the application capability of the refrigerator in scenarios without a fixed power supply such as in-vehicle and outdoor, and meeting the reliability requirements of use in multiple scenarios. The control method of the control circuit of a cold and hot semiconductor refrigerator proposed in this embodiment also has the following advantages: 1) the use of a multi-power supply mode improves the system power supply reliability and ensures the circuit control function under extreme conditions; 2) accurate charging and discharging control is achieved by real-time monitoring of battery parameters, effectively extending the battery life and preventing overcharging and over-discharging; 3) the intelligent switching of cooling / heating functions optimizes the energy efficiency ratio and improves the temperature regulation efficiency; 4) when the external power supply is interrupted, the backup power supply is automatically switched to maintain operation. Combined with the battery cut-off protection mechanism, it not only ensures the safety of refrigerated items but also avoids deep discharge damage to the battery. Overall, the emergency endurance capability and energy utilization efficiency of the equipment are enhanced, and it has significant energy-saving and environmental protection characteristics.

[0035] Example 3 See also Figure 3 This embodiment also provides a vehicle 6, including the control circuit of the hot and cold semiconductor refrigerator as described in the above embodiment ( Figure 3Not marked in the figure), the control circuit includes: a first power supply circuit 1, a second power supply circuit 2, a charge and discharge control circuit 3, a storage battery 4 and a refrigerator working state control circuit 5; the output end of the first power supply circuit 1 is connected to the input end of the charge and discharge control circuit 3 and the refrigerator working state control circuit 5 respectively, the input end of the charge and discharge control circuit 3 and the refrigerator working state control circuit 5 are also connected to the output end of the second power supply circuit 2, the output end of the charge and discharge control circuit 3 is connected to the positive end of the storage battery 4, the negative end of the storage battery 4 and the output end of the refrigerator working state control circuit 5 are connected to the input end of the first power supply circuit 1, and are also connected to the input end of the second power supply circuit 2.

[0036] In this embodiment, firstly, a dual-path redundant design of the first power supply circuit and the second power supply circuit is adopted to ensure seamless switching between the external power supply and the storage battery; secondly, the storage battery is intelligently charged and discharged by the charge and discharge control circuit, and automatically switches to the storage battery for power supply when the external power supply is interrupted, and combined with the refrigerator working state control circuit, the cooling / heating function of the cold and hot semiconductor refrigerator is maintained to continue to operate, thereby ensuring the working efficiency of the cold and hot semiconductor refrigerator. Furthermore, the control circuit of the present invention has the functions of self-identification of power supply and self-switching of power supply mode, and can maintain the efficient operation of the cold and hot semiconductor refrigerator in the absence of an external power supply, effectively expanding the application capability of the refrigerator in scenarios without a fixed power supply such as in-vehicle and outdoor, and meeting the reliability requirements of use in multiple scenarios.

[0037] Obviously, the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A control circuit for a hot and cold semiconductor refrigerator, characterized in that: include: A first power supply circuit (1), a second power supply circuit (2), a charge and discharge control circuit (3), a storage battery (4) and a refrigerator working state control circuit (5); the output end of the first power supply circuit (1) is connected to the input ends of the charge and discharge control circuit (3) and the refrigerator working state control circuit (5), respectively; the input ends of the charge and discharge control circuit (3) and the refrigerator working state control circuit (5) are also connected to the output end of the second power supply circuit (2); the output end of the charge and discharge control circuit (3) is connected to the positive end of the storage battery (4); the negative end of the storage battery (4) and the output end of the refrigerator working state control circuit (5) are connected to the input end of the first power supply circuit (1) and are also connected to the input end 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) comprises an AC power source (11), an AC / DC inverter (12), a first current regulating circuit (13) and a second current regulating circuit (14); the positive terminal of the AC power source (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 regulating circuit (13); the second output terminal of the AC / DC inverter (12) is connected to the input terminal of the second current regulating circuit (14); the output terminal of the first current regulating circuit (13) and the output terminal of the second current regulating circuit (14) are connected to the charge and discharge control circuit (3) and are further connected 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); and the third output terminal of the AC / DC inverter (12) is connected to the negative terminal of the AC power source (11).

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

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

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 provided with a low-voltage DC power supply, the positive terminal of the low-voltage DC power supply is respectively connected to the input terminal of the charge and discharge control circuit (3) and the refrigerator working state control circuit (5), and the negative terminal of the low-voltage DC power supply is respectively connected to the negative terminal of the storage battery (4) and the output terminal of the refrigerator working state control circuit (5).

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 and discharge control circuit (3) comprises a first IC detection element 8254AA, a second IC detection element 4407, a fifth capacitor C5 and a sixth capacitor C6, wherein the input end of the first IC detection element 8254AA is respectively connected to the output ends of the first power supply circuit (1) and the second power supply circuit (2), the output end of the first IC detection element 8254AA is respectively connected to the second IC detection element 4407 and the input end of the fifth capacitor C5, the output end of the fifth capacitor C5 is respectively connected to the first output end of the second IC detection element 4407, the input end of the sixth capacitor C6 and the negative terminal of the storage battery (4), and the second output end of the second IC detection element 4407 and the output end of the sixth capacitor C6 are respectively connected to the positive terminal of the storage battery (4).

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) comprises 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 are also 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 are also connected to the input end of the second power supply circuit (2).

9. A control method for a control circuit of a cold and hot semiconductor refrigerator, characterized in that: The following steps are involved: S1, supplying power to the charge and discharge control circuit (3) and the refrigerator working state control circuit (5) through the first power supply circuit (1) or the second power supply circuit (2); S2, the charge and 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, continuously detects the power supply state of the first power supply circuit (1) or the second power supply circuit (2), and when it is detected that the power supply of the first power supply circuit (1) or the second power supply circuit (2) is interrupted, execute S4; otherwise, return to S2; S4, controlling the discharge state of the storage battery (4) through the charge and discharge control circuit (3), supplying 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 and discharge control circuit (3) detects that the voltage or current parameter of the storage battery (4) reaches a cut-off threshold.

10. A vehicle, characterized in that: The invention comprises a control circuit for a hot and cold semiconductor refrigerator as claimed in any one of claims 1 to 8.

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