Refrigeration power control circuit and refrigerator

Abstract

The utility model discloses a refrigeration power control circuit and a refrigerator, and the control circuit comprises a transformer which is provided with a primary winding, a secondary winding and an auxiliary winding, and the primary winding, the secondary winding and the auxiliary winding are connected through magnetic coupling; the primary winding is connected with a power supply; the secondary winding is used for outputting voltage; the number of turns of the auxiliary winding is greater than the original number; the power supply chip is provided with a power supply end and a control end; the power supply end is connected with the auxiliary winding, and the auxiliary winding supplies power to the power supply chip; the control end is connected with the secondary winding and is used for adjusting a coupling magnetic field between the secondary winding and the auxiliary winding so as to change the output voltage of the secondary winding; and the refrigeration load is connected with the secondary winding, and the refrigeration load is used for receiving the output voltage of the secondary winding so as to adjust the refrigeration power. According to the utility model, the refrigeration power is adjusted by optimizing the transformer, the normal and stable work of the power supply chip is maintained, and the cost of refrigeration products is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigerator control, in particular to a refrigeration power control circuit and a refrigerator. Background Art

[0002] At present, the volume of small refrigerators on the market is relatively small. Therefore, a power supply with a relatively small output voltage and a semiconductor refrigeration chip can generally meet the refrigeration requirements of small refrigerators. However, for large refrigerators with a relatively large volume, in order to achieve different temperatures in different areas of the refrigerator, multiple boxes are usually set in the refrigerator. Since there are many boxes, multiple refrigeration chips are needed to achieve the effect of accurately controlling the temperature of each box, so as to meet the requirement of maintaining different temperatures in different boxes.

[0003] At present, refrigerator products with multiple refrigeration chips usually adopt a multi-power supply structure. The output voltage of the transformer winding is used to supply power to the power supply chip to work. When the required refrigeration temperature has been reached, it is necessary to reduce the power of the refrigeration chip to maintain the current temperature. At this time, it is necessary to reduce the output voltage of the refrigeration chip. However, when the output voltage is reduced, the voltage is too low, which will cause the power supply chip to fail to work properly.

[0004] The traditional method is to use an auxiliary power supply to supply power to the power supply chip to ensure that the power supply chip can work properly. The Chinese invention patent with the publication number of CN117134474A discloses a refrigerator control system and a refrigerator based on solar-assisted power supply, which exactly uses a solar battery pack as an auxiliary power supply to supply power to the refrigerator to maintain the normal operation of the refrigerator, resulting in two sets of power supply devices in the refrigerator. The existence of the auxiliary power supply will lead to an increase in the cost of the refrigerator product, and at the same time, the failure rate of the two sets of power supply devices will also increase. Summary of the Utility Model

[0005] In order to overcome the disadvantages and deficiencies existing in the prior art, the utility model provides a refrigeration power control circuit and a refrigerator.

[0006] The utility model is realized through the following technical solutions:

[0007] In the first aspect, an embodiment of the utility model provides a refrigeration power control circuit, including:

[0008] A transformer, having a primary winding, a secondary winding, and an auxiliary winding. The primary winding, the secondary winding, and the auxiliary winding are magnetically coupled; the primary winding is connected to a power supply, and the secondary winding is used to output voltage; the number of turns of the auxiliary winding is greater than the original number of turns;

[0009] A power chip is provided with a power supply terminal and a control terminal; the power supply terminal is connected to an auxiliary winding, and the auxiliary winding provides a supply voltage for the power chip; the control terminal is connected to a secondary winding, and the control terminal is used to adjust the coupling magnetic field between the secondary winding and the auxiliary winding to change the output voltage of the secondary winding;

[0010] A refrigeration load is connected to the secondary winding, and the refrigeration load is used to receive the output voltage of the secondary winding to adjust the refrigeration power.

[0011] In the present utility model, by changing the number of turns of the auxiliary winding of the transformer and appropriately increasing the output voltage of the auxiliary winding, when it is necessary to reduce the power of the refrigeration load, even if the output voltage of the refrigeration load is reduced, it can still provide the voltage required by the power chip to maintain the normal operation of the power chip, replacing the traditional solution of using an auxiliary power supply to supply power to the power chip alone, and reducing the cost of refrigeration products.

[0012] In one embodiment, it further includes:

[0013] A temperature sensor is connected to the power chip and is used to measure the ambient temperature and output it to the power chip.

[0014] The temperature sensor of the present utility model is directly connected to the power chip, and the power chip decides whether to adjust the output voltage of the transformer according to the measured temperature of the temperature sensor, making the refrigeration adjustment more intelligent.

[0015] In some embodiments, it further includes:

[0016] A feedback circuit, the input end of the feedback circuit is connected to the temperature sensor, and the output end of the feedback circuit is connected to the feedback end of the power chip, and is used to feedback the ambient temperature to the power chip, so that the power chip adjusts the output of its control end to change the coupling magnetic field between the secondary winding and the auxiliary winding, thereby adjusting the output voltage of the secondary winding.

[0017] The temperature sensor of the present utility model can be connected to the power chip after passing through the feedback circuit, and the feedback circuit decides whether to adjust the output voltage of the transformer, improving the flexibility of refrigeration control.

[0018] In one embodiment, it further includes:

[0019] A switch circuit is connected to the output end of the secondary winding, and the switch circuit is used to receive the output voltage of the secondary winding to change its on / off state;

[0020] A semiconductor refrigeration chip is connected to the switch circuit. The semiconductor refrigeration chip stops refrigerating when the switch circuit is in the off state, and the semiconductor refrigeration chip starts refrigerating when the switch circuit is in the on state.

[0021] The utility model determines the working state of the semiconductor refrigeration chip through a switching circuit, and uses the semiconductor refrigeration chip as a refrigeration load, so that the refrigeration power control circuit can be applied to micro-miniature refrigeration products.

[0022] In one embodiment, the switching circuit includes a triode Q4 and a MOS transistor Q2. The base of the triode Q4 is connected to the emitter of the triode Q4 through a resistor R24 and grounded. The collector of the triode Q4 is connected to the refrigeration load through a resistor R13. The collector of the triode Q4 is connected to the gate of the MOS transistor Q2. The source of the MOS transistor Q2 is grounded, and the drain of the MOS transistor Q2 is connected to the refrigeration load.

[0023] The utility model controls the working state of the semiconductor refrigeration chip through a triode and a MOS transistor to ensure the control accuracy of the refrigeration load.

[0024] In one embodiment, it further includes:

[0025] A stabilization circuit. The power supply terminal of the power supply chip is connected to the auxiliary winding through the stabilization circuit, which is used to stabilize the voltage provided by the auxiliary winding to the power supply chip and improve the working stability of the power supply chip.

[0026] In one embodiment, the stabilization circuit includes a triode Q1, a voltage stabilizing diode Z1, and a resistor R14. The power supply terminal is connected to the emitter of the triode Q1. The base of the triode Q1 is connected to one end of the auxiliary winding through the voltage stabilizing diode Z1. The base of the triode Q1 is connected to the collector of the triode Q1 through the resistor R14. The collector of the triode Q1 is connected to the other end of the auxiliary winding.

[0027] The utility model jointly realizes the stabilization and regulation of the power supply voltage through the triode Q1, the voltage stabilizing diode Z1, and the resistor R14 to improve the stability of the power supply chip.

[0028] In one embodiment, it further includes:

[0029] A switching power supply, which is internally provided with a transformer for converting the AC voltage output by the transformer into a DC voltage.

[0030] In one embodiment, it further includes:

[0031] A display device, which is connected to the power supply chip or the microcontroller, wherein the microcontroller is connected to the power supply chip.

[0032] The utility model enables users to more conveniently understand the refrigeration power adjustment situation through an external display device.

[0033] In a second aspect, an embodiment of the utility model provides a refrigerator, including the refrigeration power control circuit as described above.

[0034] The beneficial effects of the utility model:

[0035] The number of turns of the auxiliary winding of the transformer of the present utility model is increased, enabling the transformer to adapt to a wider working voltage range. It can be conveniently adjusted to the voltage required for the suitable thermoelectric cooler, and the output voltage of the auxiliary winding can also be appropriately increased. When it is necessary to reduce the power of the refrigeration load, even if the output voltage of the refrigeration load is reduced, the required voltage for the power supply chip can still be provided to maintain the normal operation of the power supply chip. By optimizing the design of the transformer of the present utility model, the traditional scheme of using an auxiliary power supply to supply power to the power supply chip alone can be replaced. While maintaining the normal and stable operation of the power supply chip, the cost of the refrigeration product can be reduced. Since the auxiliary power supply is no longer used, the maintenance cost of the refrigeration product will also be correspondingly reduced, improving the overall reliability of the refrigeration product. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 is the circuit diagram of the refrigeration power control circuit of the present utility model;

[0037] Figure 2 is the circuit diagram of the step-down circuit of the present utility model;

[0038] Figure 3 is the circuit diagram of the switching circuit of the present utility model;

[0039] Figure 4 is the module schematic diagram of multiple thermoelectric coolers of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] The orientation terms such as up, down, left, right, front, back, front side, back side, top, bottom, etc. mentioned or possibly mentioned in this specification are defined relative to the structures shown in the respective drawings. They are relative concepts. Therefore, they may change accordingly depending on their different positions and usage states. So, these or other orientation terms should not be construed as restrictive terms.

[0041] Beauty refrigerators on the market usually have multiple compartments, and each compartment can achieve different refrigeration temperatures to meet the different temperature requirements of different cosmetic products. Currently, in order to meet the different refrigeration requirements of multiple compartments, refrigerator products usually need to be equipped with multiple cooling chips and a multi-power supply structure to accurately control the temperature of each compartment.

[0042] In a multi-power supply structure, the voltage is usually output by the transformer winding for the power supply chip to work. When the temperature inside the refrigerator has reached the required refrigeration temperature, it is necessary to reduce the power of the cooling chip to maintain the current temperature inside the refrigerator. At this time, the output voltage of the cooling chip needs to be reduced. However, when the output voltage is reduced, the voltage is too low, which may cause the power supply chip to malfunction.

[0043] To ensure the normal operation of the power supply chip, the traditional method is to use single - path or multi - path point power control to drive the thermoelectric cooler, and an additional auxiliary power supply is required to supply power to the power supply chip. However, the presence of multiple sets of power supply devices in the refrigerator will lead to an increase in the cost of the refrigerator and an increase in the failure rate, resulting in the inability to widely promote the refrigerator products in the market.

[0044] To solve the above problems, this embodiment proposes a refrigeration power control circuit that does not require an additional auxiliary power supply to supply power to the power supply chip separately. By optimizing the transformer design, the product stability is maintained while the product cost is reduced, and the overall reliability of the product is improved.

[0045] Please refer to Figure 1 , the refrigeration power control circuit specifically includes a transformer, a power supply chip, and a refrigeration load.

[0046] The transformer has a primary winding, a secondary winding, and an auxiliary winding. The primary winding, the secondary winding, and the auxiliary winding are magnetically coupled; the primary winding is connected to the power supply, and the power supply voltage is connected to the primary winding after power supply filtering; the secondary winding is used to connect the refrigeration load and provide the required output voltage for the refrigeration load; the number of turns of the auxiliary winding is greater than the original number of turns, and the auxiliary winding is connected to the power supply chip to provide a supply voltage for the power supply chip.

[0047] The transformer in this embodiment is a part of the switching power supply, and the switching power supply is used as an overall power supply device; the transformer is used to convert the AC voltage provided by the power grid into a voltage level suitable for use by electronic devices, and the switching power supply further converts the AC voltage output by the transformer into a DC voltage for device use.

[0048] Among them, the original number of turns refers to the original number of turns of the auxiliary winding of the transformer required for producing the corresponding refrigeration product when it leaves the factory, that is, the original number of turns of the auxiliary winding of the transformer when purchasing the transformer, which is the number of turns without improvement. The original number of turns of the auxiliary winding can be set according to the circuit requirements. For example, the transformer required for producing refrigerator A is transformer type A1, and the number of turns of the auxiliary winding of transformer A1 is N1, and N1 is the original number of turns; the user purchases transformer type A1 and installs it in refrigerator A, and then improves the number of turns of the auxiliary winding of transformer A in A1 type, increasing the number of turns of the auxiliary winding so that the number of turns of the auxiliary winding is N2, and N2 is greater than N1. By increasing the number of turns of the auxiliary winding, the output voltage of the auxiliary winding can be increased, and the output voltage of the auxiliary winding will be higher than the voltage output before the improvement of the transformer.

[0049] Alternatively, a specific number of turns of the original turns is preset. The transformer under the original turns can only provide the power supply voltage for the normal operation of the power supply chip, and cannot provide the power supply voltage for the normal operation of the power supply chip after reducing the output voltage of the transformer. The original turns can be determined by testing. In this embodiment, the number of turns of the auxiliary winding is increased, so that the number of turns of the auxiliary winding is more than the original turns. In this state, the transformer can adapt to a wider working voltage range, and can also supply power to the power supply chip normally even when the output voltage of the transformer is reduced.

[0050] In this embodiment, it is defined that Figure 1 the number of turns of the winding of pins 4 to 6 is the number of turns of the auxiliary winding. By increasing the number of turns of pins 4 to 6, the transformer can adapt to a wider working voltage range and can be conveniently adjusted to the voltage required for the suitable refrigeration load.

[0051] The power supply chip is at least provided with a power supply terminal and a control terminal; the power supply terminal is connected to the auxiliary winding, and the auxiliary winding supplies power to the power supply chip; the control terminal is connected to the secondary winding, and the control terminal is used to adjust the magnetic field coupled between the secondary winding and the auxiliary winding so as to change the output voltage of the secondary winding and the output voltage of the auxiliary winding.

[0052] The power supply chip in this embodiment has a feedback terminal, a power supply terminal and a control terminal; the power supply chip refers to a power management chip. Figure 1 The power supply terminal of the power supply chip in is the VDD terminal, and the VDD terminal is connected to the auxiliary winding. The output voltage generated by the auxiliary winding is processed and then provided to the power supply chip through the VDD terminal to provide electrical energy for the power supply chip to maintain the normal operation of the power supply chip.

[0053] The control terminal of the power supply chip is connected to the secondary winding through a switching element. According to the output of the control terminal, the on / off state of the switching element can be changed, so as to adjust the voltage input to the secondary winding.

[0054] In this embodiment, the switching element is a Figure 1 MOS transistor Q3 as shown. When the GATE output of the control terminal is at a high level, the MOS transistor Q3 is turned on, and when the control terminal outputs a low level, the MOS transistor Q3 is turned off; the MOS transistor Q3 is connected to the secondary winding, and the on / off state of the MOS transistor Q3 will change the input voltage of the secondary winding.

[0055] Since the auxiliary winding, secondary winding, and primary winding of the transformer share the same magnetic core, and the primary winding, secondary winding, and auxiliary winding are magnetically coupled. When the input voltage of the secondary winding changes, it will cause the coupling magnetic field between the secondary winding and the auxiliary winding to change, resulting in a change in the output voltage of the secondary winding, thereby achieving the effect of adjusting the power of the refrigeration load. At the same time, when the coupling magnetic field between the secondary winding and the auxiliary winding changes, according to the turns ratio of the secondary winding to the auxiliary winding, the output voltage of the auxiliary winding will also change in the same proportion, thereby changing the supply voltage provided by the auxiliary winding to the power supply chip.

[0056] Since the number of turns of the auxiliary winding of the transformer in this embodiment is increased, even if the supply voltage output from the auxiliary winding to the power supply chip is changed, the normal operation of the power supply chip can be ensured.

[0057] In one embodiment, it further includes a temperature sensor connected to the power supply chip, which is used to measure the ambient temperature and feedback it to the power supply chip to adjust the output of the control terminal.

[0058] Specifically, the power supply chip is also provided with a feedback terminal. The temperature sensor is directly connected to the feedback terminal. After the temperature sensor collects the ambient temperature data, it transmits the ambient temperature data to the power supply chip, and the power supply chip determines whether it is necessary to adjust the refrigeration power of the refrigeration load, thereby adjusting the output of the control terminal of the power supply chip.

[0059] In another embodiment, it includes a temperature sensor for measuring the ambient temperature; and a feedback circuit. The input end of the feedback circuit is connected to the temperature sensor, and the output end of the feedback circuit is connected to the feedback terminal of the power supply chip, which is used to feedback the ambient temperature to the power supply chip, that is, the temperature data is processed through the temperature sensor and the feedback circuit to determine whether it is necessary to adjust the refrigeration power of the refrigeration load.

[0060] Specifically, the feedback circuit includes a microcontroller and a buck circuit. The microcontroller is connected to the temperature sensor and the buck circuit. When the temperature data reaches the preset temperature, it means that the cooling capacity has met the cooling demand. Therefore, when the ambient temperature reaches the preset temperature, the microcontroller generates a specified signal, which can be a PWM signal. After being processed by the buck circuit, the PWM signal is output to the feedback terminal of the power supply chip. The power supply chip can then reduce the input voltage of the secondary winding according to the processed PWM signal, weakening the coupling magnetic field between the secondary winding and the auxiliary winding, resulting in a decrease in the output voltage of the secondary winding, thereby reducing the power of the cooling load and stopping the cooling of the cooling load to maintain the current temperature. At the same time, the weakening of the magnetic field between the secondary winding and the auxiliary winding will also cause a decrease in the output voltage of the auxiliary winding, reducing the supply voltage provided to the power supply chip. However, due to the increase in the number of turns of the auxiliary winding of the transformer in this embodiment, even if the supply voltage output from the auxiliary winding to the power supply chip is reduced, the normal operation of the power supply chip can be ensured.

[0061] As Figure 2 shown, the buck circuit includes resistor R28, capacitor C11, resistor R27, capacitor C9, resistor R15, resistor R19, resistor R20, and resistor R21, etc. The PWM signal is divided by R28 and then flows through capacitor C11 and resistor R27 in sequence for decoupling and voltage division respectively. The output signal is further smoothed through a filter network composed of R15, R19, R20, R21, and C9 to obtain the processed PWM signal.

[0062] Combined with Figure 1 , Figure 2 shown, the processed PWM signal is fed back to the feedback terminal FB of the power supply chip. The power supply chip controls the state of the switching element Q3 according to the processed PWM signal, adjusting the coupling magnetic field between the secondary winding and the auxiliary winding by changing the input voltage of the secondary winding.

[0063] It should be noted that the temperature judgment actions performed by the microcontroller and the power supply chip have been disclosed in the prior art and are only briefly introduced here.

[0064] To ensure that the cooling load operates as required, the cooling load is connected to the output terminal of the secondary winding. The cooling load is used to receive the output voltage of the secondary winding to adjust its own cooling power. Among them, the cooling load can be a refrigeration device with an automatic control module, an air conditioning device with a controller, etc.

[0065] In this embodiment, the refrigeration load includes a microcontroller, a switching circuit, and a semiconductor refrigeration chip. The output terminal of the auxiliary winding is sequentially connected to the semiconductor refrigeration chip through the microcontroller and the switching circuit. That is, the voltage generated by the secondary winding is supplied to the microcontroller through the voltage stabilizing circuit. The microcontroller outputs a corresponding voltage signal to control the switching state of the switching circuit, and further controls the working state of the semiconductor refrigeration chip. When the microcontroller outputs a first level, the switching circuit is turned on so that the power supply current flows through the refrigeration load to drive the semiconductor refrigeration chip to refrigerate. When the microcontroller outputs a low level, the switching circuit is turned off to stop the semiconductor refrigeration chip from refrigerating.

[0066] As Figure 3 shown, the switching circuit includes a triode Q4 and a MOS transistor Q2. The triode Q4 is an NPN-type triode. The output terminal of the microcontroller is connected to the triode Q4 through a resistor R17. The base of the triode Q4 is connected to the emitter of the triode Q4 through a resistor R24 and grounded. The collector of the triode Q4 is connected to the first end of the refrigeration load through a resistor R13. The collector of the triode Q4 is connected to the gate of the MOS transistor Q2. The source of the MOS transistor Q2 is grounded. The drain of the MOS transistor Q2 is connected to the second end of the refrigeration load.

[0067] When the first level output by the microcontroller is a high level, the MOS transistor Q2 is turned on so that the power supply current flows through the refrigeration load to drive the refrigeration load to refrigerate. When the second level output by the microcontroller is a low level, the MOS transistor Q2 is not turned on to stop the refrigeration load from refrigerating.

[0068] In order to further improve the stability of the power supply chip in this embodiment, a stabilizing circuit is provided in the circuit. That is, the power supply terminal of the power supply chip is connected to the auxiliary winding through the stabilizing circuit, so that the supply voltage generated by the auxiliary winding is provided to the power supply chip after passing through the stabilizing circuit, ensuring the stability of the power supply chip voltage.

[0069] Specifically, the stabilizing circuit includes a triode Q1, a zener diode Z1, and a resistor R14. The triode Q1 is an NPN-type triode. The power supply terminal of the power supply chip is connected to the emitter of the triode Q1. The base of the triode Q1 is connected to one end of the auxiliary winding through the zener diode Z1. The base of the triode Q1 is connected to the collector of the triode Q1 through a resistor R14. The collector of the triode Q1 is connected to the other end of the auxiliary winding.

[0070] When the supply voltage of the auxiliary winding increases significantly, the current passing through the triode Q1 decreases, resulting in a decrease in the voltage provided to the power supply chip. On the contrary, if the output voltage of the auxiliary winding decreases, the triode Q1 can increase the current passing through it, causing the voltage provided to the power supply chip to rise, thus maintaining the stability of the power supply chip power supply.

[0071] The power supply chip can be connected to the key device and / or display screen according to actual needs, and ensure the normal operation of the externally connected key device and / or display screen when the power supply chip is operating normally; the key device and / or display screen can also be directly connected to the microcontroller, and the microcontroller can realize the normal operation of external devices such as the display screen.

[0072] The working principle of the refrigeration power control circuit in this embodiment is as follows:

[0073] By increasing the number of turns of the auxiliary winding of the transformer, the output voltage of the auxiliary winding is increased. On this premise, when the temperature data detected by the temperature sensor reaches the preset temperature, the microcontroller generates a PWM signal and outputs it to the feedback terminal through the feedback circuit. The power supply chip receives the PWM signal and controls the on / off state of the switching element according to the PWM signal, thereby changing the input voltage of the secondary winding. By weakening the coupling magnetic field between the secondary winding and the auxiliary winding, the voltage output from the secondary winding to the refrigeration load is reduced, so that the power of the refrigeration load decreases, and at this time the refrigeration load stops refrigerating to maintain the current temperature. At the same time, since the number of turns of the secondary winding is proportional to the number of turns of the auxiliary winding, in this embodiment, when the input voltage of the secondary winding decreases, the output voltage of the auxiliary winding also decreases proportionally. However, due to the increase in the number of turns of the auxiliary winding of the transformer, even if the output voltage of the auxiliary winding decreases, it can still provide the required voltage for the power supply chip to maintain the normal operation of the power supply chip and ensure the stability of the power supply chip. This embodiment can replace the traditional scheme of using an auxiliary power supply to supply power to the power supply chip alone by optimizing the design of the transformer. While maintaining the normal and stable operation of the power supply chip, it can reduce the cost of refrigeration products. Since the auxiliary power supply is no longer used, the maintenance cost of refrigeration products will also be reduced accordingly, improving the overall reliability of refrigeration products.

[0074] In some embodiments, a refrigerator is further provided. The refrigerator includes the refrigeration power control circuit as described above, and the refrigeration power control circuit is used as a power board to control the refrigeration capacity of the semiconductor refrigeration sheet in the refrigerator. As Figure 4 shown, the microcontroller can be connected to the door magnetic switch to open or close the refrigerator door, and the semiconductor refrigeration sheet can be connected to the fan. The fan diffuses the cold air generated by the refrigerating surface of the semiconductor refrigeration sheet into the refrigerator cabinet. At the same time, an additional fan can also be used to dissipate the heat generated by the heat generating surface of the semiconductor refrigeration sheet during refrigeration outside the refrigerator to achieve a heat dissipation effect.

[0075] If it is necessary to maintain different temperatures in multiple compartments of the refrigerator, multiple refrigeration sheets can be set, and different refrigeration sheets are applied to different compartments to refrigerate each compartment separately. Correspondingly, the refrigeration power control circuit is increased with corresponding switching power supplies and refrigeration sheets. The working principle of the refrigeration power control circuit with multiple switching power supplies and multiple refrigeration sheets is the same as that of the aforementioned single-refrigeration-sheet refrigeration power control circuit. The principle of the refrigeration power control circuit has been disclosed above and will not be repeated here.

[0076] The utility model is not limited to the above embodiments. If various modifications or deformations of the utility model do not deviate from the spirit and scope of the utility model, and provided that these modifications and deformations fall within the scope of the claims of the utility model and equivalent technical scope, then the utility model also intends to encompass these modifications and deformations.

Claims

1. A cooling power control circuit, characterized in that: include: A transformer, comprising a primary winding, a secondary winding and an auxiliary winding, wherein the primary winding, the secondary winding and the auxiliary winding are connected by magnetic coupling; The primary winding is connected to a power supply, and the secondary winding is used to output a voltage; the number of turns of the auxiliary winding is greater than the original number of turns; A power chip is provided with a power supply end and a control end; the power supply end is connected to the auxiliary winding, and the auxiliary winding is used to provide a power supply voltage for the power chip; the control end is connected to the secondary winding, and the control end is used to adjust the coupling magnetic field between the secondary winding and the auxiliary winding to change the output voltage of the secondary winding; A refrigeration load is connected to the secondary winding, and the refrigeration load is used to receive the output voltage of the secondary winding to adjust the refrigeration power.

2. The refrigeration power control circuit according to claim 1, characterized in that: Also includes: The temperature sensor is connected to the power chip and is used to measure the ambient temperature.

3. The refrigeration power control circuit according to claim 2, characterized in that: Also includes: A feedback circuit, wherein the input end of the feedback circuit is connected to the temperature sensor, and the output end of the feedback circuit is connected to the power chip, and is used to transmit the ambient temperature to the power chip.

4. The refrigeration power control circuit according to claim 1, characterized in that: The refrigeration load comprises: a switch circuit connected to the secondary winding, the switch circuit being used to receive the output voltage of the secondary winding to change its on / off state; The semiconductor refrigeration chip is connected to the switch circuit. The semiconductor refrigeration chip stops cooling when the switch circuit is in the off state, and starts cooling when the switch circuit is in the on state.

5. The refrigeration power control circuit according to claim 4, characterized in that: The switch circuit includes a transistor Q4 and a MOS transistor Q2, the base of the transistor Q4 is connected to the emitter of the transistor Q4 via a resistor R24 ​​and is grounded, the collector of the transistor Q4 is connected to the refrigeration load via a resistor R13, the collector of the transistor Q4 is connected to the gate of the MOS transistor Q2, the source of the MOS transistor Q2 is grounded, and the drain of the MOS transistor Q2 is connected to the refrigeration load.

6. The refrigeration power control circuit according to claim 1, characterized in that: Also includes: A stabilization circuit, wherein the power supply end of the power supply chip is connected to the auxiliary winding via the stabilization circuit, and is used to stabilize the voltage provided by the auxiliary winding to the power supply chip.

7. The cooling power control circuit according to claim 6, characterized in that: The stabilization circuit includes a transistor Q1, a voltage-stabilizing diode Z1 and a resistor R14, the power supply end is connected to the emitter of the transistor Q1, the base of the transistor Q1 is connected to one end of the auxiliary winding via the voltage-stabilizing diode Z1, the base of the transistor Q1 is connected to the collector of the transistor Q1 via the resistor R14, and the collector of the transistor Q1 is connected to the other end of the auxiliary winding.

8. The refrigeration power control circuit according to claim 1, characterized in that: Also includes: A switching power supply is provided with the transformer inside and is used for converting the AC voltage output by the transformer into a DC voltage.

9. The refrigeration power control circuit according to claim 1, characterized in that: Also includes: The display screen is connected to the power chip or the microcontroller, wherein the microcontroller is connected to the power chip.

10. A refrigerator, characterized in that: It comprises a refrigeration power control circuit as claimed in any one of claims 1 to 9.

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