CN220648779U - Variable frequency control circuit and refrigerator - Google Patents

Abstract

The application provides a frequency conversion control circuit and a refrigerator, wherein the frequency conversion control circuit comprises a processing circuit, a temperature control circuit and a tank circuit, and the processing circuit is configured to generate a frequency conversion driving signal based on a first power supply signal; the temperature control circuit is configured to be connected with the first power supply signal, is connected with the processing circuit and selectively transmits the first power supply signal to the processing circuit based on temperature information; the energy storage circuit is respectively connected with the temperature control circuit and the processing circuit, and is configured to provide a second power supply signal for the processing circuit when the processing circuit is not connected with the power supply signal, and is charged based on the first power supply signal when the processing circuit is connected with the first power supply signal. The power consumption of the variable frequency control circuit can be reduced, zero power consumption of an external power supply for providing a first power supply signal can be realized in a standby state, the working energy efficiency of the refrigerator can be improved, and the power consumption of the refrigerator is further reduced.

Description

Variable frequency control circuit and refrigerator

Technical Field

The application relates to the technical field of household appliances, in particular to a frequency conversion control circuit and a refrigerator.

Background

In the current society, a refrigerator is an indispensable household appliance in people's daily life. In order to reduce the energy consumption of the refrigerator in daily life, a variable frequency controller is often adopted in the market at present to control the operation efficiency of the variable frequency compressor so as to realize the variable frequency refrigerator, thereby saving the energy consumption.

In the prior art, a variable frequency controller of a variable frequency refrigerator is always in a power-on state during the power-on period of the refrigerator, and even when the refrigerator temporarily does not need to work by a variable frequency compressor, the variable frequency controller is still in a standby state and always consumes electric energy, so that the energy consumption of the refrigerator is increased, and the energy efficiency of the refrigerator is reduced.

Disclosure of Invention

The application provides a frequency conversion control circuit and refrigerator not only can reduce frequency conversion control circuit's consumption, and can realize the zero power consumption to the external power source who provides first power signal under the stand-by state, and can improve the work efficiency of refrigerator, and then reduce the consumption of refrigerator.

In order to solve the technical problem, the application provides a frequency conversion control circuit, which comprises a processing circuit, a temperature control circuit and a tank circuit, wherein the processing circuit is configured to generate a frequency conversion driving signal based on a first power supply signal; the temperature control circuit is configured to be connected with the first power supply signal, is connected with the processing circuit and selectively transmits the first power supply signal to the processing circuit based on temperature information; the energy storage circuit is respectively connected with the temperature control circuit and the processing circuit, and is configured to provide a second power supply signal for the processing circuit when the processing circuit is not connected with the power supply signal, and is charged based on the first power supply signal when the processing circuit is connected with the first power supply signal.

Wherein, the tank circuit includes: one end of the capacitor is grounded, and the other end of the capacitor is connected with the processing circuit and the temperature control circuit.

Wherein, processing circuit's rated voltage is different with tank circuit's charging voltage, and frequency conversion control circuit still includes: and the transformation circuit is respectively connected with the temperature control circuit and the energy storage circuit and is configured to charge the energy storage circuit after the first power supply signal is subjected to transformation treatment.

Wherein, the frequency conversion control circuit still includes: and the input end of the first unidirectional conduction circuit is connected with the connection part of the voltage transformation circuit and the energy storage circuit, and the output end of the first unidirectional conduction circuit is connected with the connection part of the temperature control circuit and the processing circuit.

The energy storage circuit comprises a capacitor, the voltage transformation circuit comprises a first diode, the first unidirectional conduction circuit comprises a second diode, one end of the capacitor is grounded, the other end of the capacitor is connected with the processing circuit and the cathode of the first diode respectively, the anode of the first diode is connected with the temperature control circuit, the anode of the second diode is connected with the junction of the first diode and the capacitor, and the cathode of the second diode is connected with the junction of the temperature control circuit and the processing circuit.

Wherein the processing circuit comprises: the processing sub-circuit is connected with the temperature control circuit, and the temperature control circuit selectively transmits the first power supply signal to the processing sub-circuit based on the temperature information; the timing sub-circuit is respectively connected with the temperature control circuit and the energy storage circuit and acquires the interruption time length of the first power supply signal transmitted by the temperature control circuit; the processing sub-circuit obtains the interrupt duration from the timing sub-circuit and generates a variable frequency drive signal based on the interrupt duration.

Wherein, the frequency conversion control circuit still includes: and the input end of the second unidirectional conduction circuit is connected with the temperature control circuit, and the output end of the second unidirectional conduction circuit is connected with the junction of the energy storage circuit and the timing sub-circuit.

The energy storage circuit comprises a capacitor, the second unidirectional conduction circuit comprises a third diode, the anode of the third diode is connected with the temperature control circuit, the cathode of the third diode is connected with the timing subcircuit, one end of the capacitor is grounded, and the other end of the capacitor is connected with the junction of the third diode and the timing subcircuit respectively.

Wherein, the temperature control circuit comprises a mechanical temperature controller.

In order to solve the technical problem, the application also provides a refrigerator, which comprises the variable frequency control circuit and the variable frequency compressor, wherein the variable frequency compressor is connected with the processing circuit, and a variable frequency driving signal is acquired from the processing circuit.

The beneficial effects of this application are: the frequency conversion control circuit comprises a processing circuit, a temperature control circuit and an energy storage circuit, wherein the temperature control circuit controls whether a first power supply signal provides electric energy for the processing circuit and the energy storage circuit based on temperature information, so that the electric energy consumption of the processing circuit and the energy storage circuit to the first power supply signal can be controlled based on the temperature information, the electric energy consumption of the processing circuit and the energy storage circuit to an external power supply can be controlled based on the temperature information, the control accuracy of the frequency conversion control circuit to the electric energy consumption can be improved, and the power consumption of the frequency conversion control circuit is reduced; when the first power supply signal is not connected with the processing circuit and the energy storage circuit, the energy storage circuit provides a second power supply signal for the processing circuit, so that the processing circuit can enter a standby state, zero power consumption of the processing circuit and the energy storage circuit on the first power supply signal can be realized, and zero power consumption of the frequency conversion control circuit on the first power supply signal in the standby state can be realized; and when the first power supply signal is not connected to the processing circuit and the energy storage circuit, the energy storage circuit provides a second power supply signal for the processing circuit, so that the processing circuit can enter a standby state, and when the first power supply signal is connected to the processing circuit again, the processing circuit can calculate the optimal operating frequency of the corresponding controlled load according to the information in the standby state, and further can control the corresponding load to work with the highest energy efficiency node, thereby improving the working energy efficiency of the equipment. Therefore, the frequency conversion control circuit can reduce the power consumption of the frequency conversion control circuit, zero power consumption of an external power supply for providing a first power supply signal in a standby state can be realized, the working energy efficiency of the refrigerator can be improved, and the power consumption of the refrigerator is further reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:

fig. 1 is a schematic circuit diagram of a first embodiment of a frequency conversion control circuit of the present application;

FIG. 2 is a schematic circuit diagram of a second embodiment of the variable frequency control circuit of the present application;

FIG. 3 is a schematic circuit diagram of a third embodiment of the variable frequency control circuit of the present application;

fig. 4 is a schematic circuit diagram of a fourth embodiment of the frequency conversion control circuit of the present application;

fig. 5 is a schematic circuit diagram of a fifth embodiment of the frequency conversion control circuit of the present application;

fig. 6 is a schematic circuit diagram of a sixth embodiment of the frequency conversion control circuit of the present application;

fig. 7 is a schematic circuit diagram of a seventh embodiment of the frequency conversion control circuit of the present application.

Detailed Description

The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

The terms "first," "second," and the like in this application are used for distinguishing between different objects and not for describing a particular sequential order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.

It should be noted that when an element is fixed to another element, it includes directly fixing the element to the other element or fixing the element to the other element through at least one other element located therebetween. When one element is connected to another element, it includes directly connecting the element to the other element or connecting the element to the other element through at least one intervening other element.

The present application first proposes a frequency conversion control circuit, as shown in fig. 1, fig. 1 is a schematic circuit diagram of a first embodiment of the frequency conversion control circuit of the present application. The frequency conversion control circuit comprises a processing circuit 01, a temperature control circuit 02 and an energy storage circuit 03, wherein the processing circuit 01 is configured to generate a frequency conversion driving signal based on a first power supply signal; the temperature control circuit 02 is configured to be connected with the first power supply signal, the temperature control circuit 02 is connected with the processing circuit 01, and the first power supply signal is selectively transmitted to the processing circuit 01 based on temperature information; the energy storage circuit 03 is connected to the temperature control circuit 02 and the processing circuit 01, and is configured to provide a second power signal to the processing circuit 01 when the processing circuit 01 is not connected to the first power signal, and to charge based on the first power signal when the processing circuit 01 is connected to the first power signal.

Specifically, the temperature control circuit 02 is electrically connected to the energy storage circuit 03 and the processing circuit 01, and the energy storage circuit 03 is electrically connected to the processing circuit 01. One end of the temperature control circuit 02 inputs a first power signal, the other end is electrically connected with the processing circuit 01 and the energy storage circuit 03, and the temperature control circuit 02 can control the on-off between the first end and the second end based on temperature information so as to selectively transmit the first power signal to the processing circuit 01 and the energy storage circuit 03.

Specifically, when the temperature control circuit 02 is turned off based on the temperature information, the electrical paths of the first power signal transmitted to the processing circuit 01 and the energy storage circuit 03 are turned off, so that the processing circuit 01 cannot receive the first power signal and enters a standby state, and the energy storage circuit 03 can provide the second power signal for the processing circuit 01 and provide the electrical energy required by the standby of the processing circuit 01. When the temperature control circuit 02 is turned on based on the temperature information, the first power signal is transmitted to the processing circuit 01, and the electrical path of the energy storage circuit 03 is turned on, the processing circuit 01 receives the first power signal and enters the working state, and the first power signal provides the energy storage circuit 03 with electric energy, so that the energy storage circuit 03 stores energy, the processing circuit 01 outputs a variable frequency driving signal to the corresponding load according to the information in the standby state, and the corresponding load is controlled to be at the optimal operating frequency, so that the load can operate in the working state with the highest energy efficiency node.

For example, in an application scenario, the load is a variable frequency compressor, when the temperature control circuit 02 of the refrigerator monitors that the temperature of the refrigerator reaches a first preset temperature, or when the temperature of the refrigerator is within a set range, the temperature control circuit 02 is disconnected, the variable frequency compressor stops working, the first power supply signal controlled by the temperature control circuit 02 is transmitted to the processing circuit 01, the power path of the energy storage circuit 03 is disconnected, and the energy storage circuit 03 and the processing circuit 01 stop the power consumption of an external power supply for providing the first power supply signal; meanwhile, the processing circuit 01 enters a standby state, and the energy storage circuit 03 provides a second power supply signal to the processing circuit 01 to maintain the standby state operation of the processing circuit 01, namely, the frequency conversion control circuit is in a state without external power supply connection, and the overall external standby energy consumption is 0.

Further, in the above application scenario, when the temperature control circuit 02 of the refrigerator monitors that the temperature of the refrigerator reaches the second preset temperature or when the temperature of the refrigerator exceeds the set range during the standby state of the processing circuit 01, the temperature control circuit 02 is turned on, the first power signal controlled by the temperature control circuit 02 is transmitted to the processing circuit 01, and the electrical paths of the energy storage circuit 03 are turned on, and at this time, the first power signal is input into the temperature control circuit 02 and output to the processing circuit 01 and the energy storage circuit 03 through the temperature control circuit 02. Based on the first power supply signal, the processing circuit 01 calculates the optimal frequency of the variable frequency compressor controlled by the processing circuit 01 when the variable frequency compressor operates in the working state in a combined mode according to the interruption time length (namely the specific time difference of on-off of each temperature control circuit) of the first power supply signal acquired in the standby state, and outputs a variable frequency driving signal based on the optimal frequency, so that the corresponding variable frequency compressor is controlled to operate in the optimal frequency, and the working state can be operated by the highest energy efficiency node; meanwhile, the tank circuit 03 performs charging based on the first power supply signal, supplementing the power consumed by itself in the standby state of the processing circuit 01.

Therefore, in the above application scenario, the frequency conversion control circuit of the embodiment can not only improve the control accuracy of the frequency conversion control circuit on the power consumption through the temperature control circuit 02 and reduce the power consumption of the frequency conversion control circuit, but also realize zero power consumption of the frequency conversion control circuit to an external power supply in a standby state, and simultaneously enable the frequency conversion compressor of the refrigerator to be at the highest energy efficiency node in the working state, so that the power consumption of the refrigerator can be reduced.

The frequency conversion control circuit of the embodiment has the beneficial effects that the frequency conversion control circuit of the embodiment comprises the processing circuit 01, the temperature control circuit 02 and the energy storage circuit 03, the temperature control circuit 02 controls whether the first power supply signal provides electric energy for the processing circuit 01 and the energy storage circuit 03 based on temperature information, so that the electric energy consumption of the processing circuit 01 and the energy storage circuit 03 to the first power supply signal can be controlled based on the temperature information, the electric energy consumption of the processing circuit 01 and the energy storage circuit 03 to an external power supply can be controlled based on the temperature information, the control accuracy of the frequency conversion control circuit to the electric energy consumption can be improved, and the power consumption of the frequency conversion control circuit can be reduced; when the first power supply signal is not connected to the processing circuit 01 and the energy storage circuit 03, the energy storage circuit 03 provides a second power supply signal for the processing circuit 01, so that the processing circuit 01 can enter a standby state, zero power consumption of the processing circuit 01 and the energy storage circuit 03 on the first power supply signal can be realized, and zero power consumption of the frequency conversion control circuit on the first power supply signal can be realized in the standby state; and when the first power supply signal is not connected to the processing circuit 01 and the energy storage circuit 03, the energy storage circuit 03 provides the second power supply signal for the processing circuit 01, so that the processing circuit 01 can enter a standby state, and when the first power supply signal is connected to the processing circuit 01 again, the processing circuit 01 can calculate the optimal operating frequency of the corresponding controlled load according to the information in the standby state, and further can control the corresponding load to work with the highest energy efficiency node, thereby improving the working energy efficiency of the equipment. Therefore, the frequency conversion control circuit of the embodiment not only can reduce the power consumption of the frequency conversion control circuit, but also can realize zero power consumption of an external power supply for providing the first power supply signal in a standby state, and can improve the working energy efficiency of the equipment, thereby reducing the power consumption of the equipment.

Alternatively, when the first power signal is turned off for a long time, for example, in an application scenario, the refrigerator is powered off for a long time because the refrigerator is not connected to an external power supply for a long time, so that the power consumption in the energy storage circuit 03 is depleted, and the standby state of the processing circuit 01 cannot be maintained, the timing of the interruption period of the first power signal in the processing circuit 01 may be set to perform reset processing, and the processing circuit 01 may output the variable frequency driving signal according to the initial power-up mode when the first power signal is turned on next time. The arrangement can enable the variable frequency control circuit to control the load variable frequency work when the electric quantity of the energy storage circuit 03 is not consumed, and the stability and the safety of the variable frequency control circuit are improved.

Optionally, when the first power signal is disconnected for multiple times and then is connected to the processing circuit 01, a timing reset process of the processing circuit 01 for interrupting the first power signal appears in each connection, which indicates that the energy storage circuit 03 has failed, the processing circuit 01 can be set to switch to a preset mode to output a variable frequency driving signal so as to control the operation efficiency of the variable frequency compressor and avoid abnormal starting of the variable frequency compressor. The setting can make the frequency conversion control circuit can intelligently judge the working condition of the energy storage circuit 03 to can still control the load frequency conversion work when the energy storage circuit 03 is damaged, and improve the stability and the safety of the frequency conversion control circuit.

In other embodiments, similar improvements may be made to the frequency conversion control circuit, and will not be described here.

The application further provides a frequency conversion control circuit, as shown in fig. 2, fig. 2 is a schematic circuit structure diagram of a second embodiment of the frequency conversion control circuit. The rated voltage of the processing circuit 01 of the present embodiment is different from the charging voltage of the tank circuit 03, and on the basis of the embodiment shown in fig. 1, the frequency conversion control circuit further includes a voltage transformation circuit 04, where the voltage transformation circuit 04 is respectively connected to the temperature control circuit 02 and the tank circuit 03, and configured to perform voltage transformation processing on the first power supply signal and then charge the tank circuit 03.

Specifically, as shown in fig. 2, the temperature control circuit 02 is electrically connected to the voltage transformation circuit 04 and the processing circuit 01, the voltage transformation circuit 04 is electrically connected to the tank circuit 03, and the tank circuit 03 is electrically connected to the processing circuit 01. One end of the temperature control circuit 02 is input with a first power signal, and the other end is electrically connected with the processing circuit 01 and the transformation circuit 04; the temperature control circuit 02 can control the on-off between the first end and the second end based on the temperature information so as to selectively transmit the first power supply signal to the processing circuit 01 and the transformation circuit 04.

Specifically, when the temperature control circuit 02 is turned off based on the temperature information, the electrical paths of the first power signal transmitted to the processing circuit 01 and the voltage transformation circuit 04 are turned off, so that the processing circuit 01 cannot receive the first power signal and enters a standby state, and the energy storage circuit 03 can provide the second power signal for the processing circuit 01 and provide the electrical energy required by the standby of the processing circuit 01. When the temperature control circuit 02 is turned on based on the temperature information, the first power signal is transmitted to the processing circuit 01, and the electrical paths of the voltage transformation circuit 04 are turned on, the processing circuit 01 receives the first power signal and enters the working state, and the first power signal provides the energy storage circuit 03 with electric energy, so that the energy storage circuit 03 stores energy, the processing circuit 01 calculates and outputs a variable frequency driving signal to the corresponding load according to the information in the standby state, and the corresponding load is controlled to be at the optimal operation frequency, so that the load can operate in the working state with the highest energy efficiency node.

The beneficial effect of this setting lies in, because the rated voltage of processing circuit 01 is different with the charging voltage of tank circuit 03, when temperature control circuit 02 switched on, first power signal can insert tank circuit 03 after carrying out the transformation processing for tank circuit 03 when charging through vary voltage circuit 04 earlier, can protect tank circuit 03, improves tank circuit 03's life, improves the security of frequency conversion control circuit.

Alternatively, in other embodiments, after the first power signal is output from the temperature control circuit 02, a series of processes may be performed, and then the voltage transformation circuit 04 and the processing circuit 01 are connected in the form of an input voltage. This arrangement can make the voltage of the first power supply signal adapt to the actual conditions of the processing circuit 01, the transformation circuit 04 and the energy storage circuit 03, and protect the circuit. Similar modifications can be made to the variable frequency control circuit in other embodiments.

Optionally, the variable frequency control circuit further includes a first unidirectional conduction circuit 05, an input end of the first unidirectional conduction circuit 05 is connected with a connection position of the voltage transformation circuit 04 and the energy storage circuit 03, and an output end of the first unidirectional conduction circuit 05 is connected with a connection position of the temperature control circuit 02 and the processing circuit 01.

Specifically, the temperature control circuit 02 is electrically connected to the voltage transformation circuit 04, the processing circuit 01, and the first unidirectional conductive circuit 05, the voltage transformation circuit 04 is electrically connected to the energy storage circuit 03, and the first unidirectional conductive circuit 05 is electrically connected to the processing circuit 01 and the energy storage circuit 03. One end of the temperature control circuit 02 inputs a first power signal, the other end is electrically connected with the processing circuit 01, the voltage transformation circuit 04 and the first unidirectional conduction circuit 05, the temperature control circuit 02 can control the on-off between the first end and the second end based on temperature information so as to selectively transmit the first power signal to the processing circuit 01 and the voltage transformation circuit 04, and the first unidirectional conduction circuit 05 can enable the temperature control circuit 02 to be incapable of transmitting the first power signal to the energy storage circuit 03 through the first unidirectional conduction circuit 05.

Specifically, when the temperature control circuit 02 is turned off based on the temperature information, the electrical paths of the first power signal transmitted to the processing circuit 01, the voltage transformation circuit 04, and the first unidirectional current conducting circuit 05 are turned off, so that the processing circuit 01 cannot receive the first power signal and enter the standby state, and the energy storage circuit 03 can provide the second power signal for the processing circuit 01 via the first unidirectional current conducting circuit 05 to provide the electrical energy required for standby for the processing circuit 01. When the temperature control circuit 02 is conducted based on temperature information, since the input end of the first unidirectional conduction circuit 05 is connected with the connection part of the voltage transformation circuit 04 and the energy storage circuit 03, and the output end of the first unidirectional conduction circuit 05 is connected with the connection part of the temperature control circuit 02 and the processing circuit 01, the first power supply signal is transmitted to the processing circuit 01 and the electrical path of the voltage transformation circuit 04 to conduct, and the first power supply signal can only be subjected to voltage transformation treatment by the voltage transformation circuit 04 and then is input into the energy storage circuit 03 to charge the energy storage circuit 03 so as to store energy; meanwhile, the processing circuit 01 receives the first power supply signal and enters a working state, the processing circuit 01 calculates and outputs a variable frequency driving signal to a corresponding load according to information in a standby state, the corresponding load is controlled to be in an optimal operation frequency, and then the load can operate in the working state through the highest energy efficiency node.

The beneficial effect of this kind of setting lies in, when processing circuit 01 only 1 input, the second power signal that energy storage circuit 03 output and the first power signal that temperature control circuit 02 output can only share same processing circuit 01's input, this condition can make there is the electricity to be connected between energy storage circuit 03 and the temperature control circuit 02, add first unidirectional conduction circuit 05 this moment, can make when temperature control circuit 02 switches on, because the unidirectional conduction effect of first unidirectional simplex (its input is connected with energy storage circuit 03, the junction of temperature control circuit 02 and processing circuit 01 is connected to its output), energy storage circuit 03 is input to the first power signal after the transformation processing of only passing through voltage transformation circuit 04, avoid first power signal direct access energy storage circuit 03, cause the damage to energy storage circuit 03. Especially when the rated voltage of the processing circuit 01 is different from the charging voltage of the energy storage circuit 03, the energy storage circuit 03 can be protected by the arrangement, so that the energy storage circuit 03 is prevented from being damaged due to the fact that an unfit power signal is connected, the safety of the frequency conversion control circuit can be improved, and the service life of the energy storage circuit 03 is prolonged; further, the input end of the first unidirectional conduction circuit 05 is connected with the connection part of the voltage transformation circuit 04 and the energy storage circuit 03, so that the energy storage circuit 03 can provide the second power supply signal for the processing circuit 01 only through the first unidirectional conduction circuit 05, the voltage transformation processing is not needed, the electric energy consumption can be reduced, and the circuit structure is simple.

The application further provides a frequency conversion control circuit, as shown in fig. 3, fig. 3 is a schematic circuit structure diagram of a third embodiment of the frequency conversion control circuit. On the basis of the embodiment shown in fig. 2, the tank circuit 03 of this embodiment includes a capacitor C1, one end of the capacitor C1 is grounded, and the other end of the capacitor C1 is connected to the processing circuit 01 and the temperature control circuit 02.

Specifically, in this embodiment, the temperature control circuit 02 is electrically connected to the voltage transformation circuit 04, the processing circuit 01, and the first unidirectional conductive circuit 05, the voltage transformation circuit 04 is electrically connected to the capacitor C1, and the first unidirectional conductive circuit 05 is electrically connected to the processing circuit 01 and the capacitor C1. One end of the temperature control circuit 02 inputs a first power signal, the other end is electrically connected with the processing circuit 01, the voltage transformation circuit 04 and the first unidirectional conduction circuit 05, the temperature control circuit 02 can control the on-off between the first end and the second end based on temperature information so as to selectively transmit the first power signal to the processing circuit 01 and the voltage transformation circuit 04, and the unidirectional conduction effect of the first unidirectional conduction circuit 05 can enable the temperature control circuit 02 to be incapable of transmitting the first power signal to the energy storage circuit 03 through the first unidirectional conduction circuit 05.

Specifically, when the temperature control circuit 02 is turned off based on the temperature information, the electrical paths of the first power signal transmitted to the processing circuit 01, the voltage transformation circuit 04, and the first unidirectional conductive circuit 05 are turned off, so that the processing circuit 01 cannot receive the first power signal and enter the standby state, and the capacitor C1 can provide the second power signal for the processing circuit 01 via the first unidirectional conductive circuit 05 to provide the electrical energy required for standby of the processing circuit 01. When the temperature control circuit 02 is conducted based on temperature information, since the input end of the first unidirectional conduction circuit 05 is connected with the connection part of the voltage transformation circuit 04 and the capacitor C1, and the output end of the first unidirectional conduction circuit 05 is connected with the connection part of the temperature control circuit 02 and the processing circuit 01, the first power supply signal is transmitted to the processing circuit 01 and the electrical path of the voltage transformation circuit 04 to conduct, and the first power supply signal can only be subjected to voltage transformation treatment by the voltage transformation circuit 04 and then is input into the capacitor C1 to charge the capacitor C1, so that the energy storage circuit 03 stores energy; meanwhile, the processing circuit 01 receives the first power supply signal and enters a working state, the processing circuit 01 calculates and outputs a variable frequency driving signal to a corresponding load according to information in a standby state, the corresponding load is controlled to be in an optimal operation frequency, and then the load can operate in the working state through the highest energy efficiency node.

The capacitor C1 is used as the energy storage circuit 03, and the capacitor C1 is almost free from power consumption after being fully charged and has small self-loss, so that the power consumption of the frequency conversion control circuit can be reduced; the capacitor C1 has the advantages of high charge and discharge speed, large volume and weight, strong mechanical shock resistance, and capability of improving the anti-interference capability of the variable frequency control circuit and the stability and safety of the variable frequency control circuit; and the capacitor C1 can bear more charge and discharge cycles, has long service life and lower cost, and can improve the service life and stability of the frequency conversion control circuit.

Alternatively, the capacitor CI may be a super capacitor which can be charged in a few seconds and can withstand an almost infinite charging period, has a higher energy density than a conventional capacitor, is an electrochemical device capable of rapidly storing and supplying high-power electric energy, is an electrochemical element for storing energy by polarizing an electrolyte, and can support a higher number of charge and discharge cycles without exhibiting a performance decay. Supercapacitors can support a variety of charging formats, such as constant current, constant power, constant voltage, and the like. For example, in the operation life range of the refrigerator, a variable frequency compressor and a variable frequency control circuit corresponding to the variable frequency compressor are required to be turned on and off for more than 10 ten thousand times in a cumulative way, the common energy storage circuit 03 is difficult to achieve the charge and discharge times of the frequency, and the super capacitor has the performance of bearing the charge and discharge cycles of higher times, and meanwhile, the cost is relatively low, so that the service life and the stability of the variable frequency control circuit can be improved.

In other embodiments, a battery or other energy storage devices capable of being charged and discharged for many times can be used for replacing the super capacitor, and corresponding charging and discharging can be achieved.

In other embodiments, one end of the capacitor is connected to the voltage transformation circuit and the first unidirectional conduction circuit, and the other end is connected to the zero line.

In the embodiments shown in fig. 1, 4 to 7, similar modifications can be made to the tank circuit 03, and the details are not repeated here.

The application further provides a frequency conversion control circuit, as shown in fig. 4, fig. 4 is a schematic circuit diagram of a fourth embodiment of the frequency conversion control circuit of the application. On the basis of the embodiment shown in fig. 3, the energy storage circuit 03 of this embodiment includes a capacitor C1, the voltage transformation circuit 04 includes a first diode D1, the first unidirectional conduction circuit 05 includes a second diode D2, one end of the capacitor C1 is grounded, the other end of the capacitor C1 is connected with the processing circuit 01 and the cathode of the first diode D1, the anode of the first diode D1 is connected with the temperature control circuit 02, the anode of the second diode D2 is connected with the junction of the first diode D1 and the capacitor C1, and the cathode of the second diode D2 is connected with the junction of the temperature control circuit 02 and the processing circuit 01.

Specifically, in the present embodiment, the temperature control circuit 02 is electrically connected to the first diode D1, the processing circuit 01, and the second diode D2, the first diode D1 is electrically connected to the capacitor C1, and the second diode D2 is electrically connected to the processing circuit 01 and the capacitor C1. One end of the temperature control circuit 02 is input with a first power supply signal, and the other end of the temperature control circuit is electrically connected with the processing circuit 01, the anode of the first diode D1 and the cathode of the second diode D2; the temperature control circuit 02 can control the on-off between the first end and the second end based on the temperature information, so as to selectively transmit the first power signal to the processing circuit 01 and the first diode D1, and the unidirectional conduction of the second diode D2 can make the temperature control circuit 02 unable to transmit the first power signal to the tank circuit 03 via the second diode D2.

Specifically, when the temperature control circuit 02 is turned off based on the temperature information, the electrical paths of the first power signal transmitted to the processing circuit 01, the first diode D1, and the second diode D2 are turned off, so that the processing circuit 01 cannot receive the first power signal and enter the standby state, and the capacitor C1 can only provide the second power signal to the processing circuit 01 via the second diode D2 due to the unidirectional conduction of the first diode D1, so as to provide the processing circuit 01 with the electrical energy required for standby. When the temperature control circuit 02 is conducted based on temperature information, the anode of the second diode D2 is connected with the junction of the first diode D1 and the capacitor C1, and the cathode of the second diode D2 is connected with the junction of the temperature control circuit 02 and the processing circuit 01, so that the first power signal is transmitted to the processing circuit 01, and the circuit of the first diode D1 is conducted, and the first power signal can only be subjected to transformation treatment through the first diode D1, and then is input into the capacitor C1 to charge the capacitor so as to enable the energy storage circuit 03 to store energy; meanwhile, the processing circuit 01 receives the first power supply signal and enters a working state, the processing circuit 01 calculates and outputs a variable frequency driving signal to a corresponding load according to information in a standby state, the corresponding load is controlled to be in an optimal operation frequency, and then the load can operate in the working state through the highest energy efficiency node.

The transformer circuit 04 comprises the first diode D1, the anode of the first diode D1 is connected with the temperature control circuit 02, and the cathode of the first diode D1 is connected with the capacitor C1, so that when the temperature control circuit 02 is disconnected, the capacitor C1 can only provide a second power signal for the processing circuit 01 through the second diode D2 and can not transmit the second power signal to the temperature control circuit 02, the stability of the temperature control circuit 02 can be improved, the risk of circuit faults is reduced, and the stability and safety of the frequency conversion control circuit are improved; the voltage transformation circuit 04 comprises a first diode D1, wherein the anode of the first diode D1 is connected with the temperature control circuit 02, and the cathode of the first diode D1 is connected with the capacitor C1, so that when the temperature control circuit 02 is conducted, a first power signal can be subjected to voltage reduction treatment through the first diode D1 and then connected with the capacitor C1, the capacitor C1 can be protected, the service life of the capacitor C1 is prolonged, and the safety of the frequency conversion control circuit is improved; further, the first unidirectional conduction circuit 05 comprises the second diode D2, is simple in structure and low in cost, can realize a reliable unidirectional conduction function, and improves stability of the frequency conversion control circuit.

Optionally, the processing circuit 01 is connected to the connection between the cathode of the second diode D2 and the temperature control circuit 02 through the input terminal VCC, and is grounded or connected to the zero line through the output terminal GND.

In other embodiments, the photoelectric coupler can replace the first diode or the second diode to realize the corresponding circuit function, and the photoelectric coupler has small volume, long service life, no contact, strong anti-interference capability, and insulation between the output and the input, so that the stability of the frequency conversion control circuit can be improved.

In other embodiments, similar improvements may be made to the frequency conversion control circuit, and will not be described here.

The application further provides a frequency conversion control circuit, as shown in fig. 5, fig. 5 is a schematic circuit diagram of a fifth embodiment of the frequency conversion control circuit of the application. On the basis of the embodiment shown in fig. 1, the processing circuit 01 of the present embodiment includes a processing sub-circuit 11 and a timing sub-circuit 12, the processing sub-circuit 11 is connected with a temperature control circuit 02, and the temperature control circuit 02 selectively transmits a first power supply signal to the processing sub-circuit 11 based on temperature information; the timing sub-circuit 12 is respectively connected with the temperature control circuit 02 and the energy storage circuit 03, and acquires the interruption time length of the first power supply signal transmitted by the temperature control circuit 02; the processing sub-circuit 11 acquires the interrupt duration from the timing sub-circuit 12 and generates a variable frequency drive signal based on the interrupt duration.

Specifically, in the present embodiment, the processing sub-circuit 11 is in communication with the timing sub-circuit 12, and the energy storage circuit 03 is in electrical connection with the timing sub-circuit 12. One end of the temperature control circuit 02 is input with a first power signal, and the other end of the temperature control circuit is electrically connected with the processing sub-circuit 11, the energy storage circuit 03 and the timing sub-circuit 12; the temperature control circuit 02 can control the on-off between the first end and the second end based on the temperature information so as to selectively transmit the first power supply signal to the processing sub-circuit 11, the energy storage circuit 03 and the timing sub-circuit 12.

Specifically, when the temperature control circuit 02 is turned off based on the temperature information, the electrical paths of the first power signal transmitted to the processing sub-circuit 11, the energy storage circuit 03 and the timing sub-circuit 12 are turned off, and the frequency conversion control circuit enters a standby state, wherein the processing sub-circuit 11 cannot receive the first power signal and enters a power-off state; the tank circuit 03 provides a second power signal to the timing subcircuit 12 to provide the power required by the timing subcircuit 12. When the temperature control circuit 02 is turned on based on the temperature information, the first power signal is transmitted to the processing sub-circuit 11, the energy storage circuit 03, and the timing sub-circuit 12, and the processing sub-circuit 11 receives the first power signal and enters the working state, and the first power signal provides the energy storage circuit 03 with electric energy, so that the energy storage circuit 03 stores energy, and the first power signal provides the timing sub-circuit 12 with electric energy. The processing sub-circuit 11 obtains the interruption time of the first power supply signal in the timing sub-circuit 12 through communication connection, calculates and outputs a variable frequency driving signal to a corresponding load based on the interruption time, and controls the corresponding load to be in an optimal operation frequency, so that the load can operate in a working state with the highest energy efficiency node.

The processing circuit 01 of this embodiment further includes a processing sub-circuit 11 and a timing sub-circuit 12, and the temperature control circuit 02 controls whether the first power supply signal provides electric power for the processing sub-circuit 11, the energy storage circuit 03 and the timing sub-circuit 12 based on the temperature information, so that the electric power consumption of the processing sub-circuit 11, the energy storage circuit 03 and the timing sub-circuit 12 for the first power supply signal can be controlled based on the temperature information, and the electric power consumption of the processing sub-circuit 11, the energy storage circuit 03 and the timing sub-circuit 12 for the external power supply can be controlled based on the temperature information, thereby improving the control accuracy of the frequency conversion control circuit for the electric power consumption and reducing the power consumption of the frequency conversion control circuit; when the first power supply signal is not connected to the processing sub-circuit 11, the energy storage circuit 03 and the timing sub-circuit 12, the energy storage circuit 03 only needs to provide the second power supply signal for the timing sub-circuit 12 in the processing circuit 01, so that zero power consumption of the first power supply signal can be realized when the frequency conversion control circuit is in a standby state; when the first power supply signal is not connected to the processing sub-circuit 11, the energy storage circuit 03 and the timing sub-circuit 12, the energy storage circuit 03 only needs to provide the second power supply signal for the timing sub-circuit 12 in the processing circuit 01, so that the consumption of the processing circuit 01 on the electric energy of the energy storage circuit 03 in the standby state of the frequency conversion control circuit can be greatly reduced, the energy consumption can be saved, the single discharge time length of the energy storage circuit 03 can be prolonged, the charge and discharge frequency of the energy storage circuit 03 can be reduced, the service life of the energy storage circuit 03 can be prolonged, the power consumption of the frequency conversion control circuit in the standby state can be reduced, and the electric energy can be further saved; when the first power signal is not connected to the processing sub-circuit 11, the energy storage circuit 03 and the timing sub-circuit 12, the energy storage circuit 03 only needs to provide the second power signal for the timing sub-circuit 12 in the processing circuit 01, so that when the first power signal is connected again, the processing sub-circuit 11 can obtain the interruption time of the first power signal in the timing sub-circuit 12 through communication connection, calculate and output a variable frequency driving signal to a corresponding load based on the interruption time, and control the corresponding load to be at the optimal operation frequency, and the load can operate in the working state with the highest energy efficiency node, thereby improving the working energy efficiency of the equipment. Therefore, the frequency conversion control circuit of the embodiment not only can further reduce the power consumption of the frequency conversion control circuit, but also can realize zero power consumption of an external power supply for providing the first power supply signal in a standby state, and can improve the working energy efficiency of the equipment, thereby reducing the power consumption of the equipment.

In other embodiments, similar improvements may be made to the frequency conversion control circuit, and will not be described here.

The application further provides a frequency conversion control circuit, as shown in fig. 6, fig. 6 is a schematic circuit diagram of a sixth embodiment of the frequency conversion control circuit of the application. On the basis of the embodiment shown in fig. 5, the frequency conversion control circuit of this embodiment further includes a second unidirectional conduction circuit 06, an input end of the second unidirectional conduction circuit 06 is connected with the temperature control circuit 02, and an output end of the second unidirectional conduction circuit 06 is connected with the junction of the tank circuit 03 and the timing sub-circuit 12.

Specifically, in the present embodiment, the processing sub-circuit 11 is in communication connection with the timing sub-circuit 12, the energy storage circuit 03 is in electrical connection with the timing sub-circuit 12, the second unidirectional conductive circuit 06 is in electrical connection with the energy storage circuit 03 and the timing sub-circuit 12, and the second unidirectional conductive circuit 06 is in electrical connection with the temperature control circuit 02. One end of the temperature control circuit 02 is input with a first power signal, and the other end is electrically connected with the processing sub-circuit 11 and the second unidirectional conduction circuit 06; the temperature control circuit 02 can control the on-off between the first end and the second end based on the temperature information so as to selectively transmit the first power signal to the processing sub-circuit 11 and the second unidirectional conduction circuit 06.

Specifically, when the temperature control circuit 02 is turned off based on the temperature information, the electrical paths between the first power signal transmitted to the processing sub-circuit 11 and the second unidirectional conductive circuit 06 are turned off, and the frequency conversion control circuit enters a standby state, wherein the processing sub-circuit 11 cannot receive the first power signal and enters a power-off state, and the energy storage circuit 03 can only provide the second power signal for the timing sub-circuit 12 due to the action of the second unidirectional conductive circuit 06, so as to provide the electrical energy for the timing sub-circuit 12. When the temperature control circuit 02 is conducted based on temperature information, the first power supply signal is transmitted to the processing sub-circuit 11, the energy storage circuit 03 and the electric path of the timing sub-circuit 12 to conduct, the processing sub-circuit 11 receives the first power supply signal and enters a working state, and the first power supply signal provides electric energy for the energy storage circuit 03 through the second unidirectional conduction circuit 06 so as to enable the energy storage circuit 03 to store energy; and the first power signal provides power to the timing subcircuit 12 through the second unidirectional conductive circuit 06. The processing sub-circuit 11 obtains the interruption time of the first power supply signal in the timing sub-circuit 12 through communication connection, calculates and outputs a variable frequency driving signal to a corresponding load based on the interruption time, and controls the corresponding load to be in the optimal operation frequency, so that the load can operate in a working state with the highest energy efficiency node; the tank circuit 03 is charged based on the first power signal, and supplements the power consumed by itself in the standby state of the processing circuit 01.

The frequency conversion control circuit of this embodiment further includes the second unidirectional conduction circuit 06, the input end of the second unidirectional conduction circuit 06 is connected with the temperature control circuit 02, the output end of the second unidirectional conduction circuit 06 is connected with the junction of the energy storage circuit 03 and the timing sub-circuit 12, when the temperature control circuit 02 is disconnected, the energy storage circuit 03 can only provide the second power supply signal for the timing sub-circuit 12, and the second power supply signal cannot be transmitted to the temperature control circuit 02, so that the stability of the temperature control circuit 02 can be improved, the risk of circuit faults is reduced, and the stability and safety of the frequency conversion control circuit are improved.

The application further provides a frequency conversion control circuit, as shown in fig. 7, fig. 7 is a schematic circuit diagram of a seventh embodiment of the frequency conversion control circuit of the application. Based on the embodiment shown in fig. 6, the tank circuit 03 of this embodiment includes a capacitor C1, the second unidirectional conduction circuit 06 includes a third diode D3, an anode of the third diode D3 is connected to the temperature control circuit 02, a cathode of the third diode D3 is connected to the timing sub-circuit 12, one end of the capacitor C1 is grounded, and the other end of the capacitor C1 is connected to a junction of the third diode D3 and the timing sub-circuit 12, respectively.

Specifically, in the present embodiment, the processing sub-circuit 11 is in communication connection with the timing sub-circuit 12, the capacitor C1 is electrically connected with the timing sub-circuit 12, the third diode D3 is electrically connected with the capacitor C1 and the timing sub-circuit 12, and the third diode D3 is electrically connected with the temperature control circuit 02. One end of the temperature control circuit 02 is input with a first power supply signal, and the other end of the temperature control circuit is electrically connected with the processing sub-circuit 11 and the anode of the third diode D3; the temperature control circuit 02 may control the on-off between the first terminal and the second terminal thereof based on the temperature information to selectively transfer the first power signal to the processing sub-circuit 11 and the anode of the third diode D3.

Specifically, when the temperature control circuit 02 is turned off based on the temperature information, the circuit between the first power signal and the processing sub-circuit 11 and the third diode D3 is turned off, and the frequency conversion control circuit enters a standby state, wherein the processing sub-circuit 11 cannot receive the first power signal and enters a power-off state, and the capacitor C1 can only provide the second power signal for the timing sub-circuit 12 due to the effect of the third diode D3, so as to provide the power for the timing sub-circuit 12. When the temperature control circuit 02 is conducted based on the temperature information, the first power signal is transmitted to the processing sub-circuit 11, and the electrical path between the third diode D3 is conducted, the processing sub-circuit 11 receives the first power signal, and enters a working state, and the first power signal provides electric energy for the energy storage circuit 03 through the third diode D3 so as to enable the energy storage circuit 03 to store energy; and the first power signal provides power to the timing subcircuit 12 through a third diode D3.

The capacitor C1 is used as the energy storage circuit 03, and the capacitor C1 is almost free from power consumption after being fully charged and has small self-loss, so that the power consumption of the frequency conversion control circuit can be reduced; the capacitor C1 has the advantages of high charge and discharge speed, large volume and weight, strong mechanical shock resistance, and capability of improving the anti-interference capability of the variable frequency control circuit and the stability and safety of the variable frequency control circuit; the capacitor C1 can bear more charge and discharge cycles, has long service life and lower cost, and can improve the service life and stability of the variable frequency control circuit; the second unidirectional conduction circuit 06 comprises a third diode D3, has simple structure and low cost, can realize reliable unidirectional conduction function, and improves the stability of the frequency conversion control circuit.

Optionally, the timer sub-circuit 12 is connected to the connection between the cathode of the third diode D3 and the capacitor C1 through the input terminal VCC, and is grounded or connected to the zero line through the output terminal GND.

In other embodiments, the photoelectric coupler can replace the first diode or the second diode to realize the corresponding circuit function, and the photoelectric coupler has small volume, long service life, no contact, strong anti-interference capability, and insulation between the output and the input, so that the stability of the frequency conversion control circuit can be improved.

In other embodiments, similar improvements may be made to the frequency conversion control circuit, and will not be described here.

Optionally, the temperature control circuit 02 comprises a mechanical temperature controller.

The mechanical temperature controller has the advantages of simple structure, low price, low cost, firmness, durability, high stability, difficult fault occurrence, simple and convenient maintenance, low cost and low cost, and can reduce the cost; and the operation process of the mechanical temperature controller does not need electric power, is relatively more energy-saving and electricity-saving, is not easy to influence the normal work of the temperature controller due to equipment outage, and can improve the stability of the frequency conversion control circuit.

In other embodiments, the function of the temperature control circuit may also be implemented by other temperature control devices such as a computer temperature control system.

The application further provides a refrigerator, including above-mentioned frequency conversion control circuit and frequency conversion compressor, frequency conversion compressor is connected with processing circuit, obtains frequency conversion drive signal from processing circuit.

The specific implementation manner may participate in the above embodiments, and will not be described herein.

Compared with the prior art, the frequency conversion control circuit comprises the processing circuit, the temperature control circuit and the energy storage circuit, the temperature control circuit controls whether the first power supply signal provides electric energy for the processing circuit and the energy storage circuit based on temperature information, so that the electric energy consumption of the processing circuit and the energy storage circuit to the first power supply signal can be controlled based on the temperature information, the electric energy consumption of the processing circuit and the energy storage circuit to an external power supply can be controlled based on the temperature information, the control accuracy of the frequency conversion control circuit to the electric energy consumption can be improved, and the power consumption of the frequency conversion control circuit is reduced; when the first power supply signal is not connected with the processing circuit and the energy storage circuit, the energy storage circuit provides a second power supply signal for the processing circuit, so that the processing circuit can enter a standby state, zero power consumption of the processing circuit and the energy storage circuit on the first power supply signal can be realized, and zero power consumption of the frequency conversion control circuit on the first power supply signal in the standby state can be realized; and when the first power supply signal is not connected to the processing circuit and the energy storage circuit, the energy storage circuit provides a second power supply signal for the processing circuit, so that the processing circuit can enter a standby state, and when the first power supply signal is connected to the processing circuit again, the processing circuit can calculate the optimal operating frequency of the corresponding controlled load according to the information in the standby state, and further can control the corresponding load to work with the highest energy efficiency node, thereby improving the working energy efficiency of the equipment. Therefore, the frequency conversion control circuit can reduce the power consumption of the frequency conversion control circuit, zero power consumption of an external power supply for providing a first power supply signal in a standby state can be realized, the working energy efficiency of the refrigerator can be improved, and the power consumption of the refrigerator is further reduced.

The foregoing description is only of embodiments of the present application, and is not intended to limit the scope of the patent application, and all equivalent structures or equivalent processes using the descriptions and the contents of the present application or other related technical fields are included in the scope of the patent application.

Claims (10)

1. A variable frequency control circuit, comprising:

a processing circuit configured to generate a variable frequency drive signal based on the first power signal;

the temperature control circuit is configured to be connected with the first power supply signal, is connected with the processing circuit and selectively transmits the first power supply signal to the processing circuit based on temperature information;

and the energy storage circuit is respectively connected with the temperature control circuit and the processing circuit, and is configured to provide a second power supply signal for the processing circuit when the processing circuit is not connected with the power supply signal and charge based on the first power supply signal when the processing circuit is connected with the first power supply signal.

2. The variable frequency control circuit of claim 1, wherein the tank circuit comprises:

and one end of the capacitor is grounded, and the other end of the capacitor is connected with the processing circuit and the temperature control circuit.

3. The variable frequency control circuit of claim 1, wherein the nominal voltage of the processing circuit is different from the charging voltage of the tank circuit, the variable frequency control circuit further comprising:

and the transformation circuit is respectively connected with the temperature control circuit and the energy storage circuit and is configured to charge the energy storage circuit after the first power supply signal is subjected to transformation treatment.

4. A variable frequency control circuit as claimed in claim 3, wherein the variable frequency control circuit further comprises:

and the input end of the first unidirectional conduction circuit is connected with the connection part of the voltage transformation circuit and the energy storage circuit, and the output end of the first unidirectional conduction circuit is connected with the connection part of the temperature control circuit and the processing circuit.

5. The variable frequency control circuit of claim 4, wherein the tank circuit comprises a capacitor, the transformer circuit comprises a first diode, the first unidirectional conduction circuit comprises a second diode, one end of the capacitor is grounded, the other end of the capacitor is connected with the processing circuit and the cathode of the first diode, the anode of the first diode is connected with the temperature control circuit, the anode of the second diode is connected with the junction of the first diode and the capacitor, and the cathode of the second diode is connected with the junction of the temperature control circuit and the processing circuit.

6. The variable frequency control circuit of claim 1, wherein the processing circuit comprises:

the processing sub-circuit is connected with the temperature control circuit, and the temperature control circuit selectively transmits the first power supply signal to the processing sub-circuit based on temperature information;

the timing sub-circuit is respectively connected with the temperature control circuit and the energy storage circuit, and acquires the interruption time length of the first power supply signal transmitted by the temperature control circuit;

the processing sub-circuit obtains the interrupt duration from the timing sub-circuit and generates the variable frequency drive signal based on the interrupt duration.

7. The variable frequency control circuit of claim 6, further comprising:

and the input end of the second unidirectional conduction circuit is connected with the temperature control circuit, and the output end of the second unidirectional conduction circuit is connected with the junction of the energy storage circuit and the timing subcircuit.

8. The variable frequency control circuit of claim 7, wherein the tank circuit comprises a capacitor, the second unidirectional conduction circuit comprises a third diode, an anode of the third diode is connected with the temperature control circuit, a cathode of the third diode is connected with the timing sub-circuit, one end of the capacitor is grounded, and the other end of the capacitor is connected with a junction of the third diode and the timing sub-circuit respectively.

9. The variable frequency control circuit of claim 7, wherein the temperature control circuit comprises a mechanical thermostat.

10. A refrigerator, comprising:

the frequency conversion control circuit according to any one of claims 1 to 9;

and the variable frequency compressor is connected with the processing circuit and acquires the variable frequency driving signal from the processing circuit.