CN116131622A

CN116131622A - Integral frequency conversion household appliance, air conditioner and control method thereof

Info

Publication number: CN116131622A
Application number: CN202310123993.0A
Authority: CN
Inventors: 罗承荷
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2023-02-14
Filing date: 2023-02-14
Publication date: 2023-05-16

Abstract

The invention provides an integral variable frequency household appliance, an air conditioner and a control method thereof. The integral frequency conversion household appliance comprises a main board, wherein the main board is provided with a switching power supply primary circuit, a switching power supply feedback circuit, a charging control circuit and a switching power supply secondary output circuit, and the display board is electrically connected with the main board through a +12V-D output end. The +12V-D output end of the secondary output circuit of the switching power supply is connected with the display panel, the +12V-M output end of the secondary output circuit of the switching power supply is connected with a load on the side of a main board, and a loop where the +12V-D output end is located is a safe isolation loop, and the reference ground is weak current ground. The circuit that the output end that sets up in this way can be with display panel one side place keeps apart for the circuit of display panel is safer.

Description

Integral frequency conversion household appliance, air conditioner and control method thereof

Technical Field

The invention relates to the technical field of household appliances, in particular to an integral variable frequency household appliance, an air conditioner and a control method thereof.

Background

In order to solve the problem of high standby power consumption of household appliances, the prior art discloses a low-power consumption standby circuit device, an air conditioner and a control method of the air conditioner. The scheme can realize low-power standby, but the indoor unit uses a double-switch power supply, the circuit is complex, the cost is high, the switch power supply is provided with a high-frequency switch circuit, the double-switch power supply can possibly cause larger EMC interference of products, the products can also need to additionally increase electronic elements for inhibiting the EMC interference, and thus more cost is increased.

The prior art also discloses a control method and device for waking up the outdoor unit by the indoor unit, the indoor unit and a storage medium. When the scheme is in standby, the outdoor unit self-cuts off the power supply to enter a low-power consumption standby state, if a starting signal is received and a wake-up condition is met, a relay on a communication line of the indoor unit and the outdoor unit is closed, a live wire of the indoor unit is provided for the outdoor unit through the communication line, and the outdoor unit is powered on and waken up. The technology realizes low-power standby by self-cutting off the power supply of the outdoor unit and waking up the outdoor unit through the communication line, and is suitable for household variable frequency split air conditioners with power line plugs at the outdoor unit side.

In the prior art, the scheme relates to a household variable frequency split type air conditioner, and in general, the connecting wires of an indoor unit and an outdoor unit are four wires, namely a fire wire, a zero wire, a communication wire and a ground wire, respectively, the indoor unit and the outdoor unit are provided with controllers (a main board or a display board) for respectively controlling the loads of the indoor unit and the outdoor unit, and the controllers are provided with switch power supplies. The outdoor unit and the indoor unit of the existing integral variable frequency household appliance are integrated in a shell, the power line plug does not distinguish the indoor unit from the outdoor unit, the space limitation is large, the mode that the indoor unit and the outdoor unit are respectively controlled by the indoor unit controller is not adopted in the household variable frequency split type air conditioner, the size of the controller is avoided from being too large, and the cost of products is increased.

The controller of the integral frequency conversion household appliance is generally divided into a main board and a display board, wherein the main board is mainly responsible for controlling loads such as a frequency conversion compressor, a direct current or alternating current internal (or external) fan, an electronic expansion valve, a four-way valve and the like, the display board is mainly responsible for controlling loads or commands such as a display, a wind sweeping motor, an input interaction command (such as a remote control, a key and the like) and the like, and the main board and the display board adopt a serial communication circuit for data exchange. The switch power supply on the main board generally has multiple outputs, and only one power supply is used as a feedback power supply, for example, +15V, +12V1, +12V2 (safety isolation) outputs, +12V1 is used as a feedback power supply, +15V supplies power to +15V loads such as a compressor IPM and a fan IPM module of the main board, +12V1 supplies power to +12V loads such as a relay and an electronic expansion valve of the main board, and +12V2 is supplied to the display board to supply power to +12V loads such as a display and a wind sweeping motor. Because the main control MCU of the main board needs to control the strong current IPM module, in order to simplify the circuit and reduce the cost and control convenience, the ground of the main control MCU of the main board, the ground of the IPM module, +15v, and the ground of +12v1 are commonly grounded, i.e. commonly grounded with strong current, and the strong current is also called as "hot" ground, and because of the safety requirement, the +12v2 output to the display panel is usually required to be used as a safety isolation output loop, and the ground is weak current ground.

The switch power supply has multiple paths of output, only one path of feedback exists, and in normal operation, the cross adjustment rate of each output loop is poor, namely the load of a non-feedback output loop (+15V or +12V 2) is unchanged, the load of the feedback loop +12V1 is switched and jumped between light load and heavy load, or the load of the feedback loop +12V1 is unchanged, the load of the non-feedback output loop (+15V or +12V) can cause the voltage of the non-feedback loop (+15V or +12V 2) to be higher or lower, so that the problem that the load of the non-feedback loop +15V or +12V2 cannot normally work or burn out is solved, the load of the three output loops is generally balanced by adding a resistor dummy load to +15V or +12V2 in the prior art, but the condition that the load of the three output loops does not exist, due to the dummy load exists, the switch power supply has higher standby power consumption when in standby, on the other hand, the main control power supply is also has higher standby power consumption when the main control is carried out on an MCU (power supply) or the MCU, and the power supply is always has higher standby power consumption when the main control power supply is carried out on the MCU or the main control system of the MCU (3).

Aiming at the problems that the existing integral variable frequency household appliance adopts a power supply scheme of a single switch power supply and a plurality of output loops, and the output voltages of the plurality of output loops are stable and cannot be met at the same time when the integral variable frequency household appliance is in low-power standby and normally working, no effective solution is proposed at present.

Disclosure of Invention

The invention mainly aims to provide an integral variable frequency household appliance, an air conditioner and a control method thereof, which are used for solving the problem of high standby power consumption of the integral variable frequency household appliance in the prior art.

In order to achieve the above object, according to one aspect of the present invention, there is provided an integrated variable frequency home appliance comprising: the main board is provided with a switching power supply primary circuit, a switching power supply feedback circuit, a charging control circuit and a switching power supply secondary output circuit, wherein the switching power supply secondary output circuit at least comprises a +12V-D output end and a +12V-M output end, the output end of the switching power supply feedback circuit is connected with the switching power supply primary circuit, the input end of the switching power supply feedback circuit is connected with the +12V-D output end, a loop where the +12V-D output end is located is an isolation safety loop, the reference ground of the +12V-D output end is weak current, a loop where the +12V-M output end is located is strong current, and the reference ground of the +12V-M output end is strong current ground; the display board is electrically connected with the main board through a +12V-D output end, the main board supplies power to a load on the side of the display board through the +12V-D output end, the +12V-M output end is at least used for supplying power to the load on the side of the main board, and the display board is communicated with the main board through a communication circuit of the main board; the household appliance is provided with a standby mode and a working mode, and the main control MCU1 of the main board and the main control MCU2 of the display board control the household appliance to be in the standby mode, and the other output ends of the secondary output circuit of the switching power supply are in an idle state except for the condition that a loop where the +12V-D output end is located is in a light load state.

Further, in the process of controlling the household appliance to be in the standby mode, at least one relay in the charging control circuit is controlled to be disconnected, a low-level signal is output by a standby signal port of the main control MCU2 of the display panel, the chip of the main board is not enabled after the low-level signal is converted by the control conversion circuit, and the household appliance enters the standby mode.

Further, the main board is also provided with a rectification correction circuit, the charging control circuit comprises a relay K1 and a relay K2, the input end of the relay K1 and the input end of the relay K2 are connected with a power live wire, the relay K1 and the relay K2 are connected with the rectification correction circuit, and at least one of the relay K1 and the relay K2 is connected with the +12V-M output end of the main board.

Further, the control conversion circuit includes: the access terminal is used for receiving the electric signals sent by the display panel, wherein the electric signals comprise at least one of high-level signals and low-level signals; the base B of the first triode is connected with the access terminal through a resistor R11; the base B of the second triode is connected with the collector C of the first triode through a resistor R10; the base B of the third triode is connected with the collector C of the second triode through a resistor R8, the emitter E of the third triode is connected with the emitter E of the first triode, the emitter E of the third triode and the emitter E of the first triode are arranged in a weak current way, the collector C of the third triode is connected with a relay K2, the relay K2 is connected with the output end of +12V-D, and the relay K1 is connected with the output end of +12V-M; the base B of the fourth triode is connected with the collector C of the second triode through a resistor R18, the collector C of the fourth triode is connected with the positive end of the input side of the optocoupler U2, the collector C of the fourth triode is connected with the emitter E of the second triode through a resistor R7, the emitter E of the second triode is connected with the VDD output end of the display panel, the emitter E of the fourth triode is connected with the negative end of the input side of the optocoupler U2 of the control conversion circuit and is arranged in a weak current connection mode, the emitter E of the output side of the optocoupler U2 is connected with a strong current connection mode, and the collector C of the output side of the optocoupler U2 is connected with the EN pin of the chip U1 through a resistor R6.

Further, the control conversion circuit includes: the access terminal is used for receiving the electric signals sent by the display panel, wherein the electric signals comprise at least one of high-level signals and low-level signals; the base B of the first triode is connected with the access terminal through a resistor R11; the base B of the second triode is connected with the collector C of the first triode through a resistor R10; the base B of the third triode is connected with the collector C of the second triode through a resistor R8, the emitter E of the third triode is connected with the emitter E of the first triode, the emitter E of the third triode and the emitter E of the first triode are grounded, the collector C of the third triode is connected with the +12V-D output end through a resistor R17, and the relay K1 and the relay K2 are connected with the +12V-M output end; the base B of the fourth triode is connected with the collector C of the second triode through a resistor R18, the collector C of the fourth triode is connected with the positive end of the input side of the optical coupler U2, the collector C of the fourth triode is connected with the emitter E of the second triode through a resistor R7, the emitter E of the second triode is connected with the VDD output end of the display panel, the emitter E of the fourth triode is connected with the negative end of the input side of the optical coupler U2 of the control conversion circuit and is arranged in a weak current way, the emitter E of the output side of the optical coupler U2 is connected with a strong current way, the collector C of the output side of the optical coupler U2 is connected with the EN pin of the chip U1, the EN pin of the chip U1 is connected with the +12V-M output end through a resistor R15, and the EN pin of the chip U1 is connected with the strong current way through a resistor R16.

Further, the control conversion circuit further includes: and one end of the resistor R9 is connected with the base electrode B of the second triode, the other end of the resistor R9 is connected with the emitter electrode E of the second triode, and/or the capacitor C16, one end of the capacitor C16 is connected with the positive end of the input side of the optocoupler U2, and the other end of the capacitor C16 is connected with the negative end of the input side of the optocoupler U2.

Further, the main board is further provided with a +12v—m VCC conversion circuit, the output end of the optocoupler U2 is connected with the +12v—m VCC conversion circuit, the +12v—m VCC conversion circuit is provided with a first chip U1, the +12v—m VCC conversion circuit is provided with a +12v—m VCC conversion output end, the +12v—m VCC conversion output end is connected with at least one of a dynamic load circuit and other loads of VCC, the +12v—m VCC conversion circuit is electrically connected with the main control MCU1, after the access end of the control conversion circuit receives an electrical signal, the control conversion circuit converts the electrical signal into a first signal and a second signal, the first signal is used for controlling the relay K2 to be closed for charging, and the second signal is used for enabling the +12v—m VCC conversion circuit to output a target voltage.

Further, the secondary output circuit of the switching power supply further comprises a VEE output end, the display panel is further provided with a peripheral minimum circuit, the main board is further provided with a first communication circuit and a VEE-to- +15V-M circuit, the VEE-to- +15V-M circuit comprises a third chip U3, the VEE-to- +15V-M circuit is connected with the VEE output end, the VEE-to- +15V-M circuit is provided with a +15V-M output end, the +15V-M output end is used for being connected with a peripheral load on the main board side, the peripheral load on the main board side at least comprises a compressor IPM module and a fan IPM module, the first communication circuit is electrically connected with the main control MCU1, the first communication circuit is connected with the VDD output end, after the +12V-M-to-VCC circuit enables VCC voltage output, the main control MCU1 controls the peripheral circuit to be reset to start working, the first communication circuit is communicated with the display panel, and the output of the +12V-M-to-VCC circuit enables the VEE-to turn to +15V-M circuit to output target voltage.

Further, a high-voltage frequency converter is arranged in the secondary output circuit, the high-voltage frequency converter is provided with a public output winding NP1 and an output winding NP2, the output winding NP2 comprises the public output winding NP1 and an output winding NP3, the public output winding NP1 is correspondingly arranged with a +12V-M output end, the output winding NP2 is correspondingly arranged with a VEE output end, and the output winding NP3 is correspondingly arranged with a +12V-D output end.

Further, the method comprises the steps of,

wherein, X is more than or equal to 1.5 and less than or equal to 2.33, and/or the output voltage range of the VEE output end is between 18V and 28V.

Further, the display panel further comprises a +12V-D load, a dynamic load circuit, a +12V-D to VDD circuit, other loads of VDD and a man-machine interaction circuit, wherein the inputs of the +12V-D load, the dynamic load circuit and the +12V-D to VDD circuit are all connected with the +12V-D output end, the output end of the +12V-D to VDD circuit comprises the VDD output end, and the VDD output end is respectively connected with the main control MCU2, the dynamic load circuit, the VDD load and the man-machine interaction circuit, and the man-machine interaction circuit is connected with the main control MCU 2.

Further, the main board is also provided with a switching power supply rectifying circuit and a switching power supply primary circuit, the switching power supply rectifying circuit is connected with an external power supply, the switching power supply primary circuit is connected with the switching power supply rectifying circuit, and the switching power supply primary circuit is connected with the switching power supply and the switching power supply secondary output circuit.

Further, in the process that the household appliance is in the standby mode, the total output power of the household appliance is P, wherein P is less than or equal to 0.5W.

According to another aspect of the present invention, there is provided an air conditioner including an integrated variable frequency home appliance, which is the above-described integrated variable frequency home appliance.

According to another aspect of the present invention, there is provided a control method of an integrated variable frequency home appliance, the method comprising: receiving a shutdown signal, wherein the shutdown signal is used for closing a target electrical appliance; generating a control strategy set based on the shutdown signal, wherein the control strategy set is used for controlling the working state of a target component of the target electric appliance to meet preset conditions; and under the condition that the working state of the target component meets the preset condition, the relay K1 in the charging circuit is controlled to be disconnected, the relay K2 in the charging circuit is controlled to be disconnected, the standby signal port of the main controller of the display panel is controlled to output a low-level signal, and the target electrical appliance enters a standby mode.

Further, the control strategy set includes a first control strategy and a second control strategy, the target assembly includes a first target assembly and a second target assembly, the first control strategy is used for controlling the first target assembly to stop, the second control strategy is used for controlling the second target assembly to reset to an initial angle, and the second target assembly is closed, wherein the first target assembly includes at least one of the following: a compressor and a fan, the second target assembly comprising at least one of: an electronic expansion valve and a stepping wind sweeping motor.

Further, the control method further includes: receiving a starting signal, wherein the starting signal is received and obtained by a man-machine interaction circuit of a display panel; controlling the display panel to output a high-level signal; the first chip U1 and the third chip U3 are controlled to be enabled based on the high-level signal, and the relay K2 is controlled to be closed; judging whether the voltage of the rectification correction circuit reaches a preset value or not; and under the condition that the voltage of the rectification correction circuit reaches a preset value, the relay K1 is controlled to be closed, the second target component is controlled to reset to the initial position, and then the second target component is controlled to rotate to the target position.

Further, the control method further includes: acquiring operation parameters of a target electric appliance, wherein the operation parameters comprise load parameters controlled by a main board and load parameters controlled by a display board; and judging whether to start the dynamic load circuit or not based on the operation parameters.

By adopting the technical scheme, the secondary output circuit of the switching power supply is provided with a plurality of output ends, wherein the +12V-D output end of the secondary output circuit of the switching power supply is connected with the display panel, the +12V-M output end of the secondary output circuit of the switching power supply is connected with a load on the side of the main board, a loop where the +12V-D output end is located is a safety isolation loop, a weak current ground is adopted as a reference ground, a loop where the +12V-M output end is located is a strong current loop, and the reference ground is a strong current ground, so that the loops where the output ends are located can be isolated, and the loop where the +12V-D output end is located is safer.

By adopting the technical scheme of the invention, the integral variable frequency household appliance with the loop is adopted, high-power target equipment and related control circuits of the household appliance are in a complete power-losing state in a standby mode, each output loop of the switching power supply only has a load at the +12V-D output end of the secondary output circuit of the switching power supply, the load is light-load, and other output loops are in an idle state, so that low-power standby is realized.

By adopting the technical scheme, the secondary output circuit of the switching power supply is provided with a plurality of output ends, wherein the +12V-D output end of the secondary output circuit of the switching power supply is connected with the display panel, the +12V-M output end of the secondary output circuit of the switching power supply is connected with a load on the side of the main board, a loop where the +12V-D output end is located is a safety isolation loop, a weak current ground is adopted as a reference ground, a loop where the +12V-M output end is located is a strong current loop, and the reference ground is a strong current ground, so that the circuit realizes isolation between strong current and weak current, and the circuit is safer. In addition, the integral variable frequency household appliance can use a single switching power supply and a plurality of output loops, so that low-power standby can be realized, the output voltages of the plurality of output loops can be ensured to be stable during normal operation, and the power supply scheme of the plurality of switching power supplies is avoided, thereby reducing the size of the controller and the cost of the controller.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:

fig. 1 shows a schematic structural view of a first embodiment of an integrated variable frequency home appliance according to the present invention;

fig. 2 shows a schematic structural view of a second embodiment of an integrated variable frequency home appliance according to the present invention;

fig. 3 shows a schematic structural view of a third embodiment of an integrated variable frequency home appliance according to the present invention;

fig. 4 shows a flowchart of a control method of an integrated variable frequency home appliance according to the present invention.

Wherein the above figures include the following reference numerals:

100. a main board; 101. a charge control circuit; 102. a rectification correction circuit; 103. an IPM module circuit; 104. a compressor; 105. a direct current fan; 106. a switching power supply rectifying circuit; 107. a switching power supply primary circuit;

108. a switching power supply feedback circuit; 109. a switching power supply secondary output circuit; 110. VEE to +15V-M circuit; 111. a load of +12V-M; 112. the main control MCU1 and a peripheral minimum circuit thereof;

113. A +12V-M to VCC circuit; 114. a dynamic load circuit; 115. other loads of VCC; 116. a communication circuit with the display panel; 117. a control conversion circuit;

200. a display panel; 201. a load of +12V-D; 202. a dynamic load circuit; 203. a +12V-D to VDD circuit; 204. other loads of VDD; 205. a man-machine interaction circuit; 206. a master control MCU2 and a peripheral minimum circuit thereof; 207. and the communication circuit is communicated with the main board.

Detailed Description

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Exemplary embodiments according to the present application will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of these exemplary embodiments to those skilled in the art, that in the drawings, it is possible to enlarge the thicknesses of layers and regions for clarity, and that identical reference numerals are used to designate identical devices, and thus descriptions thereof will be omitted.

As shown in fig. 1 to 3, according to a specific embodiment of the present application, an integrated variable frequency home appliance is provided.

Specifically, the integrated variable frequency home appliance includes a main board 100 and a display board 200. The main board 100 is provided with a switching power supply primary circuit 107, a switching power supply feedback circuit 108, a charging control circuit 101 and a switching power supply secondary output circuit 109, wherein the switching power supply secondary output circuit 109 at least comprises a +12V-D output end and a +12V-M output end, the output end of the switching power supply feedback circuit 108 is connected with the switching power supply primary circuit 107, the input end of the switching power supply feedback circuit 108 is connected with the +12V-D output end, a loop where the +12V-D output end is located is an isolation safety loop, the reference ground of the +12V-D output end is weak current ground, the reference ground of the +12V-M output end is strong current ground. The display panel 200 is electrically connected with the main board 100 through a +12v-D output end, the main board 100 supplies power to a load on the side of the display panel 200 through the +12v-D output end, and the +12v-M output end is at least used for supplying power to the load on the side of the main board 100 (for example, the power can also be supplied to the load on the side of the main board), and the display panel 200 communicates with the main board 100 through a communication circuit of the main board 100; the household appliance has a standby mode and a working mode, and in the process that the main control MCU1 of the main board 100 and the main control MCU2 of the display board 200 control the household appliance to be in the standby mode, the other output ends of the switch power supply secondary output circuit 109 are all in an idle state except for the condition that the loop where the +12v-D output end is located is in a light load state. The charging control circuit 101 is connected to an external power source, and the switching power source primary circuit 107 is connected to the external power source through the switching power source rectifying circuit 106.

In this embodiment, the switching power supply secondary output circuit 109 is configured to have a plurality of output terminals, where the +12v-D output terminal of the switching power supply secondary output circuit 109 is connected to the display panel 200, the +12v-M output terminal of the switching power supply secondary output circuit 109 is connected to the load on the main board 100 side, and the circuit where the +12v-D output terminal is located is a safety isolation circuit, and the circuit where the +12v-M output terminal is located is a weak current circuit and the circuit where the +12v-M output terminal is located is a strong current circuit, and the circuit where the output terminals are located is isolated from the ground with reference to the strong current circuit, so that the circuit where the +12v-D output terminal is located is safer.

Further, in the process that the main control MCU1 of the main board 100 and the main control MCU2 of the display board 200 control the household appliances to be in the standby mode, including controlling at least one relay in the charging control circuit 101 to be turned off, the standby signal port of the main control MCU2 of the display board 200 outputs a low-level signal, and the chip of the main board 100 is disabled after being converted by the control conversion circuit 117, so that the household appliances enter the standby mode.

As shown in fig. 2 and 3, the motherboard 100 is further provided with a rectification correction circuit 102, the charging control circuit 101 includes a relay K1 and a relay K2, the input end of the relay K1 and the input end of the relay K2 are both connected with a power live wire, the relay K1 and the relay K2 are connected with the rectification correction circuit 102, and at least one of the relay K1 and the relay K2 is connected with the +12v—m output end of the motherboard 100. In the present embodiment, the display panel 200 controls the relay K2, and the main board 100 controls the relay K1. Of course, it may be controlled by the main board 100.

Further, the control converting circuit 117 includes an access terminal, a first transistor, a second transistor, a third transistor, and a fourth transistor. The access terminal is configured to receive an electrical signal sent by the display panel 200, where the electrical signal includes at least one of a high level signal and a low level signal. The base B of the first triode is connected with the access terminal through a resistor R11. The base B of the second triode is connected with the collector C of the first triode through a resistor R10. The base B of the third triode is connected with the collector C of the second triode through a resistor R8, the emitter E of the third triode is connected with the emitter E of the first triode, the emitter E of the third triode and the emitter E of the first triode are arranged in a weak current way, the collector C of the third triode is connected with a relay K2, the relay K2 is connected with the output end of +12V-D, and the relay K1 is connected with the output end of +12V-M; the base B of the fourth triode is connected with the collector C of the second triode through a resistor R18, the collector C of the fourth triode is connected with the positive end of the input side of the optocoupler U2, the collector C of the fourth triode is connected with the emitter E of the second triode through a resistor R7, the emitter E of the second triode is connected with the VDD output end of the display panel 200, and the emitter E of the fourth triode is connected with the negative end of the input side of the optocoupler U2 of the control conversion circuit 117 and is arranged in a weak electric mode. The emitter E of the output side of the optical coupler U2 is connected with the strong electric ground, and the collector C of the output side of the optical coupler U2 is connected with the EN pin of the chip U1 through a resistor R6.

In another embodiment of the present application, the control converting circuit 117 includes an access terminal, a first transistor, a second transistor, a third transistor, and a fourth transistor. The access terminal is configured to receive an electrical signal sent by the display panel 200, where the electrical signal includes at least one of a high level signal and a low level signal. The base B of the first triode is connected with the access terminal through a resistor R11. The base B of the second triode is connected with the collector C of the first triode through a resistor R10. The base B of the third triode is connected with the collector C of the second triode through a resistor R8, the emitter E of the third triode is connected with the emitter E of the first triode in weak current, the collector C of the third triode is connected with the output end of +12V-D through a resistor R17, the relay K1 and the relay K2 are connected with the output end of +12V-M, the base B of the fourth triode is connected with the collector C of the second triode through a resistor R18, the collector C of the fourth triode is connected with the positive end of the input side of the optocoupler U2, the emitter E of the second triode is connected with the VDD output end of the display panel 200, and the emitter E of the fourth triode is connected with the negative end of the input side of the optocoupler U2 of the control conversion circuit 117. The emitter E of the output side of the optical coupler U2 is connected with the strong electric ground, the collector C of the output side of the optical coupler U2 is connected with the EN pin of the chip U1, the EN pin of the chip U1 is connected with the +12V-M output end through a resistor R15, and the EN pin of the chip U1 is connected with the strong electric ground through a resistor R16. Further, the control conversion circuit further includes: and one end of the resistor R9 is connected with the base electrode B of the second triode, the other end of the resistor R9 is connected with the emitter electrode E of the second triode, and/or the capacitor C16, one end of the capacitor C16 is connected with the positive end of the input side of the optocoupler U2, and the other end of the capacitor C16 is connected with the negative end of the input side of the optocoupler U2.

Further, the motherboard 100 is further provided with a +12v—m VCC conversion circuit 113, an output end of the optocoupler U2 is connected with the +12v—m VCC conversion circuit 113, the +12v—m VCC conversion circuit 113 is provided with a first chip U1, the +12v—m VCC conversion circuit 113 has a +12v—m VCC conversion output end, the +12v—m VCC conversion output end is connected with at least one of the dynamic load circuit 114 and other loads 115 of VCC, and the other loads 115 of VCC may be a bulb of the motherboard, power sources of various chips, and the like. The +12v-M VCC conversion circuit 113 is electrically connected to the main control MCU1, where after the access terminal of the control conversion circuit 117 receives the electrical signal, the control conversion circuit 117 converts the electrical signal into a first signal and a second signal, the first signal is used to control the relay K2 to be closed for charging, and the second signal is used to enable the +12v-M VCC conversion circuit 113 to output the target voltage. In this embodiment, the +12v—m VCC conversion circuit 113 may generate a VCC power supply, where the VCC power supply may be 5V, 3.3V, etc., and is selected according to actual needs.

Specifically, the secondary output circuit 109 of the switching power supply further includes a VEE output end, the display panel 200 is further provided with a main control MCU2 and a peripheral minimum circuit 206 thereof, the main board 100 is further provided with a communication circuit 116 and a VEE-to- +15v-M circuit 110, the VEE-to- +15v-M circuit 110 includes a third chip U3, the VEE-to- +15v-M circuit 110 is connected to the VEE output end and to the output end of the +12v-to-M VCC circuit 113, the VEE-to- +15v-M circuit 110 has a +15v-M output end, the +15v-M output end is used to be connected to a peripheral load on the main board 100 side, the peripheral load on the main board 100 side includes at least a compressor IPM module and a blower IPM module, the main control MCU1 is electrically connected to the communication circuit 116 and the VDD output end, the main control MCU1 and the peripheral circuit after the +1v-to-M circuit 113 enables output of voltage, the main control MCU1 and the peripheral circuit start to perform electrical reset operation, the communication with the display board 116 and the display panel 200, and the +1v-to-VCC circuit 113 enable the first VCC-to output voltage to the +1v-15V-M circuit 110. Secondary power supply The output circuit 109 is provided with a high-voltage frequency converter, the high-voltage frequency converter is provided with a public output winding NP1 and an output winding NP2, the output winding NP2 comprises the public winding NP1 and an output winding NP3, wherein the public output winding NP1 is correspondingly arranged with a +12V-M output end, the output winding NP2 is correspondingly arranged with a VEE output end, and the output winding NP3 is correspondingly arranged with a +12V-D output end. Wherein,,

wherein, X is more than or equal to 1.5 and less than or equal to 2.33, and/or the output voltage range of the VEE output end is between 18V and 28V. In this embodiment, a suitable coil turn ratio is selected, preferably, the output voltage of the VEE-to- +15v-M circuit 110 can be set to one value of 18-28V, and in particular, the voltage of the VEE-to- +15v-M circuit 110 can be reasonably set according to the input voltage range of the DC-DC chip of the VEE-to- +15v-M circuit 110, the voltage of the VEE-to- +15v-M circuit 110 is raised, and the DC-DC chip is selected to convert the VEE-to- +15v-M circuit 110 to 15V, so that when the load of the output circuit +12v-M (the main board outputs 12V voltage) and +12v-D (the display board outputs 12V voltage) is adjusted in a cross manner, the input voltage of the VEE-to-converting circuit is changed within the range of 18-28V, and the DC-DC chip can keep the voltage of the output +15v-M (the main board outputs 15V voltage) stable, thereby ensuring that the compressor 104 and the direct-current fan 105 in the household appliance can work stably.

The VEE is output in a superposition manner on the basis of +12V-M, a loop where the +12V-M output end is located and the VEE-to- +15V-M circuit share GND-M reference ground, and the load 111 of +12V-M can be loads such as a relay, an electronic expansion valve and the like.

Further, the display panel 200 further includes a +12V-D load 201, a dynamic load circuit 202, a +12V-D to VDD circuit 203 (for generating a VDD power supply, VDD may be 5V, 3.3V, etc., which may be selected as required), other loads 204 of VDD, and a human-computer interaction circuit 205. The input ends of the +12V-D load 201, the dynamic load circuit 202 and the +12V-D to VDD circuit 203 are all connected with +12V-D output ends, the output end of the +12V-D to VDD circuit 203 comprises a VDD output end, the VDD output ends are respectively connected with the main control MCU2, the dynamic load circuit 202, other loads 204 of the VDD and the man-machine interaction circuit 205, the man-machine interaction circuit 205 is connected with the main control MCU2, and the other loads 204 of the VDD can be loads such as a temperature sensing bag of a display panel, power supplies of various chips and the like. In this embodiment, in the standby state, the display panel 200 only has the +12v-D to VDD circuit 203, the man-machine interaction circuit 205, the main control MCU2 and the peripheral minimum circuit 206 in the normal operation state, and the +12v-D load 201, the dynamic load circuit 202, the other loads 204 of VDD, the main board communication circuit 207 and other circuits in the abnormal operation state, so as to reduce the standby power consumption of the display panel. The transmitting port and the standby control signal port of the main control MCU2, which are in communication with the main board, are set to be in a low level state, so that the standby power consumption can be further reduced. The +12V-D load 201 can be a load of a step-and-sweep motor, a UV lamp, a display circuit, and the like.

In this embodiment, the motherboard 100 is further provided with a switching power supply rectifying circuit 106, a switching power supply primary circuit 107, and a master control MCU1 and a peripheral minimum circuit 112 thereof, the switching power supply rectifying circuit 106 is connected to an external power supply, the switching power supply primary circuit 107 is connected to the switching power supply rectifying circuit 106, and the switching power supply primary circuit 107 is connected to the switching power supply and a switching power supply secondary output circuit 109.

In the standby mode of the household appliance, the high-power compressor 104, the direct-current fan 105, the rectification correction circuit 102 and the IPM module circuit 103 related to the high-power compressor 104 and the direct-current fan are in a complete power-off state, and the power becomes 0. And the output end of the switching power supply: the +12V-D and +12V-M, VEE are powered normally, but only +12V-D is loaded and is in a light load state, the +12V-M, VEE is in an idle state, the output VCC of the +12V-M-to-VCC circuit is 0V, and the output +15V-M of the VEE-to- +15V-M circuit is 0V.

The implementation principle of the application is as follows: in standby, the high-power compressor 104 (the compressor can be one or more), the direct-current fan 105 and the charging control circuit 101, the rectification correction circuit 102, the IPM module circuit 103 and the like which are related to the high-power compressor are separated from the low-power switch power supply circuit, and the high-power compressor is controlled by control signals sent by the main control MCU2 of the display panel, and is in a complete power-losing state, namely, in standby, only the switch power supply and the circuit part of the output part of the switch power supply are powered on, and the powered circuit part is controlled in a low-power state through the related control circuit design and the control method, so that low-power standby is realized; and switching to a starting-up state and a normal working state in a standby state, and maintaining the voltage stability of each output loop of the switching power supply through feedback power supply selection, reasonable switching power supply output winding coil turn ratio setting, new control circuit design and control method.

The standby state is switched to the normal working state:

when the man-machine interaction circuit 205 (which may be a remote control receiving circuit, a key circuit, a WIFI circuit, etc.) of the display panel receives the start-up signal, the standby control port of the main control MCU2 outputs a level signal (which may be a high level or a low level, and is selected according to the actual requirement, preferably a high level) to the control conversion circuit 117, the control conversion circuit 117 converts the level signal into two control signals, one signal controls the relay K2 of the charging control circuit 101 to close and charge, and the other signal simultaneously enables the +12v—m to VCC circuit 113, so as to output a power VCC (VCC may be 5V, 3.3V, etc., and is selected according to the actual requirement). After the power supply VCC is powered on, the main control MCU2 and the peripheral minimum circuit 206 thereof start working after power on reset, and establish communication with the display panel 200 through the display panel communication circuit 116; meanwhile, VCC controls VEE to +15V-M circuit 110 to output +15V-M as an enable signal.

After the relay K2 is charged in a closed mode, the energy storage capacitor C9, the rectifying circuit and the PFC power correction circuit are powered on, the +VDC2 power supply voltage starts to rise, the +VDC2 voltage value is detected in real time, when the +VDC2 reaches a set voltage threshold value (set according to actual needs), the main control MCU1 outputs a control signal (preferably a high-level signal) to the driving circuit of the relay K1, the relay K1 of the charging control circuit 101 is closed, charging is completed, and the whole circuit device enters a normal working state to start working.

When standby is switched to start-up and normal work, in order to solve the multipath output single-path feedback of the switching power supply in the prior art, the problem that the cross adjustment rate of each output loop is poor is solved by the following measures:

the new control conversion circuit 117, the charging control circuit 101, +12v—m to VCC circuit 113, VEE to +15v—m circuit 110 are proposed to reasonably distribute coil power sources of the relay K1, the relay K2 of the charging control circuit 101, and +12v—m, +12v—d are used respectively, as shown in fig. 2:

when standby is switched to start, when the WAKE end of the control switching circuit 117 receives a high-level signal of the display panel main control MCU2, the NPN triode Q1 is conducted, the C of the NPN triode Q1 is extremely low level, the PNP triode Q2 is further conducted, the C of the Q2 is extremely high level, the NPN triodes Q3 and Q4 are conducted, and the C poles of the Q3 and Q4 are both low level; the C of the triode Q3 is extremely low level, the coil of the relay K2 works, and the contact of the relay K2 is closed for charging; the triode Q4 has extremely low C level, the input side 1 pin of the optocoupler U2 is low level and does not work, the output side of the optocoupler U2 is not conducted, the enabling EN pin of the first chip U1 is in a suspended state, the chip U1 enables output of VCC voltage and supplies power to the load at the rear stage of VCC, the EN pin of the third chip U3 is high level, and the third chip U3 enables output of +15V-M and supplies power to the load at the rear stage of +15V-M. The first chip U1 and the third chip U3 select TPS54202 chips (other chips with similar functions and peripheral circuits may also be selected) of the TI company, the TPS54202 chips have 4.5V-28V wide voltage inputs, enable the EN pins to be in a suspended or high level state, and can set different voltage outputs (for example, R3, R4, R5 resistors in the +12v-M to VCC circuit 113 and R12, R13, R14 resistors in the VEE to +15v-M circuit 110 in fig. 2) according to different feedback resistors of the feedback pins FB, so that the TPS54202 chips have higher conversion efficiency during light load and heavy load. After the relay K2 is closed and charged, the K1 reaches a set voltage threshold value at +VDC2, and the main control MCU1 controls the contact to be closed.

In summary, when the standby is switched to the on state, after the WAKE end of the control conversion circuit 117 receives the high level signal of the display panel main control MCU2, the loads of the three output loops +12v_d, +12v_m, +15v_m of the secondary of the switching power supply are basically simultaneously turned on after the WAKE end of the control conversion circuit 117 is converted by the control conversion circuit 117, and the load differences of the three output loops are not very large, i.e., the three output loops are not subjected to cross adjustment, and the voltages of +12v_d, +12v_m, +15v_m are kept stable; in the normal working state, the coil power supplies of the relay K1 and the relay K2 of the charging control circuit 101 respectively use +12V-M and +12V-D and are always kept in the power-on state, and when other loads of +12V-M and +12V-D are actually operated and adjusted, the loop loads of +12V-M and +12D are not very light, so that the voltage stability of the non-feedback power supply loop +12M is improved.

The power of the switching power supply feedback circuit 108 is selected to be supplied to the isolation +12V-D of the display panel, and the feedback power is selected to be +12V-D, so that when the switching power supply is in standby, the +12V-D is in a very light load state, and the non-feedback power supply loop +12V-M, VEE can be placed in an idle state, thereby reducing the standby power consumption; meanwhile, as shown in fig. 1, the high-frequency transformer T1 output winding NP1 (corresponding to +12v—m output), NP2 (corresponding to VEE output), NP3 (corresponding to +12v—d output) of the secondary output circuit 109 of the switching power supply selects a suitable coil turn ratio, and the coil turn ratio is specifically set reasonably according to the input voltage range of the DC-DC chip of the VEE-to- +15v-M circuit 110, so that the VEE voltage is raised and the VEE is converted into +15v-M by using the DC-DC chip, so that the voltage of the VEE is changed in the range of 18 to 28V when the loads of the output circuits +12v-M and +12v-D are adjusted in a cross manner, and the DC-DC chip can keep the voltage of the output +15v-M stable, thereby ensuring that the compressor and the direct-current fan can work stably.

The dynamic load circuit 114 and the dynamic load circuit 202 are respectively powered by +12V-M (or VCC) and +12V-D (or VDD), and the working states of the dynamic load circuit 114 and the dynamic load circuit 202 are controlled by the main control MCU1 and the main control MCU 2. In a normal working state, the main board and the display board communicate in real time, the opening condition of each load is detected, whether the condition of load cross adjustment exists is judged according to the actual condition, and if the condition exists, the dynamic load circuit 114 or the dynamic load circuit 202 is started to keep the voltage of the non-feedback loop +12-M stable. For example, if the +12V-M load is opposite to the +12V-D load, the +12V-M load is heavy load, and the +12V-D load is light load, the +12V-M voltage is lower, and the dynamic load circuit 202 is turned on to increase the +12V-D load; if the +12V-M load is a light load and the +12V-D load is a heavy load, the +12V-M voltage is higher, and the dynamic load circuit 114 is turned on to increase the +12V-M load. The heavy load (or light load) mentioned above does not mean that the load of +12v—m is heavier (or lighter) than the load of +12v—d, or that the power is larger (or smaller), but is relatively large, different switching power supplies, high-frequency transformers, different applications, etc., and the light load or heavy load may be different, and in general, when the load adjustment of each output loop occurs, if the voltage fluctuation range of the non-feedback loop exceeds the range of the design requirement, the adjustment may be regarded as the light load and heavy load cross adjustment. If the design requires that the voltage of the non-feedback output is 12V plus or minus 5 percent and the voltage of the output is 12V plus or minus 10 percent when the load is adjusted in a crossing way, the dynamic load is started, and the voltage of the non-feedback loop +12V-M is kept within 12V plus or minus 5 percent.

Further, the types of the dynamic loads of the dynamic load circuit 114 and the dynamic load circuit 202 are selected according to actual requirements, and the sizes of the dynamic loads are adjusted according to actual application tests. During load cross adjustment, if some loads of +12V-M or +12V-D just do not work under a certain operation logic, such as an electronic expansion valve load of a main board +12V-M and a stepping wind sweeping motor load of a display board +12V-D can be preferentially used as dynamic loads. When the electronic expansion valve and the stepping wind sweeping motor are used as dynamic loads, only one winding is used as the dynamic load, the electronic expansion valve and the stepping wind sweeping motor are driven in a PWM mode, different PWM duty ratios are selected according to actual test requirements, and different dynamic load sizes can be achieved. The electronic expansion valve or one winding of the stepping wind sweeping motor is used as a dynamic load, and the electronic expansion valve or the stepping wind sweeping motor has the advantages that an existing circuit can be utilized, the cost is increased without additionally adding the circuit, the current working state of the electronic expansion valve or the stepping wind sweeping motor cannot be influenced, namely the electronic expansion valve or the stepping wind sweeping motor cannot rotate, and after the winding is opened, electric energy is completely converted into heat energy to be emitted. Similarly, if other loads similar to the electronic expansion valve and the stepping wind sweeping motor exist, after different driving control modes are adopted, the operation of a certain part of circuits can be realized without influencing the current working state of the circuits, and the circuit is also suitable for serving as a dynamic load. Further, the dynamic load may be a resistive load.

When in standby state:

as shown in fig. 1 and fig. 2, when the controller is in the standby state, the display panel 200 only has the +12v-D to VDD circuit 203, the man-machine interaction circuit 205, the master control MCU2 and its peripheral minimum circuit 206 in the normal operation state, and the +12v-D load 201, the dynamic load circuit 202, the other loads 204 of VDD, the main board communication circuit 207 and other circuits in the abnormal operation state, so as to reduce the standby power consumption of the display panel. Among them, the +12v-D conversion VDD circuit 203 is preferably a DC-DC conversion circuit having high conversion efficiency in both light load and heavy load. Further, the transmission port and the standby control signal port of the main control MCU2, which are in communication with the main board, are set to be in a low level state, so that the standby power consumption can be further reduced.

In the embodiment, the standby control signal of the main control MCU2 of the display panel 200 is at a low level, that is, the access terminal of the control switching circuit 117 of the main board is at a low level, the NPN first transistor is not conductive, the C pole of the first transistor is quite in a suspended state, and further the PNP second transistor is not conductive, the C pole of the second transistor is quite in a suspended state, the NPN third transistor and the fourth transistor are not conductive, the C pole of the third transistor is quite in a suspended state, and the C pole of the fourth transistor is connected to the VDD power supply (the peripheral load power supply of the display panel) through the resistor R7; the C pole of the third triode is quite in a suspended state, the coil of the relay K2 does not work, and the contact of the relay K2 is disconnected; the C pole of the fourth triode is connected to a VDD power supply through a resistor R7, namely the power supply VDD supplies power to the input side of the optocoupler through the resistor R7, the input side of the optocoupler works, the output side is conducted, the enable EN pin of the first chip U1 is grounded, the first chip U1 is in a non-enabled state, the output voltage of VCC is 0V, the EN pin of the third chip U3 is in a low level, the third chip U3 is in a non-enabled state, and the +15V-M output voltage is 0V. That is, when the standby control signal of the main control MCU2 of the display panel 200 is at low level, the three output circuits of the switching power supply of the main board 100 are only +12v—d loaded and in light load state, and the +12v— M, VEE switching circuits are in no load state, so that the standby power consumption of the whole controller scheme is extremely low, and the standby power consumption can generally reach 0.5W or less.

The rectification correction circuit 102, the compressor and fan IPM module circuit 103, the storage capacitor C1, the switching power supply rectification circuit 106, the switching power supply primary circuit 107, the switching power supply feedback circuit 108, the display panel communication circuit 116, and the main board communication circuit 207 are circuits in the prior art.

In this application, as shown in fig. 2, the control conversion circuit 117, +12v—m to VCC circuit 113, the charge control circuit 101, and VEE to +15v—m circuit 110 may be replaced by other circuits having the same or similar functions. For example: the power supply of the relay K2 in the charge control circuit 101 of fig. 2 may also be a +12-M power supply, and accordingly, if the power supply of the relay K2 is a +12-M power supply, the relay K2 is controlled by the main control MCU1 of the main board, in order to improve the cross adjustment rate, the dynamic load of the +12-D or VDD conversion circuit is increased according to the actual test condition in the normal working state, and is turned off in the standby state; the enable pin of the first chip U1 in the +12v-M to VCC circuit 113 may also set an enable value through a pull-up resistor and disable through an optocoupler, and the enable pin of the third chip U3 in the VEE to +15v-M circuit 110 may also control its enable state through the main control chip MCU1 of the motherboard. As shown in fig. 3, another alternative control conversion circuit 117, +12v—m to VCC circuit 113, charge control circuit 101, VEE to +15v—m circuit 110 is provided.

In the control switching circuit 117 in fig. 3, the npn triode Q3 is adjusted by the driving relay K2 to drive the dynamic load resistor R17, the resistor R17 may be one resistor or may be replaced by a plurality of resistors, the resistance value may be selected according to the actual test crossover adjustment condition, and other principles are the same as the control switching circuit 117 in fig. 2.

In fig. 3, the enable voltage value is configured by the enable pin EN of the first chip U1 of the +12v-M VCC circuit 113 through the resistance values of the resistors R15 and R16, different resistance values may be configured with different enable voltage values, when the output side of the optocoupler U2 is conductive, the enable pin EN is equivalent to the ground of the pin EN, the first chip U1 is not enabled, the output VCC of the +12v-M VCC circuit 113 is 0V, when the output side of the optocoupler U2 is not conductive, the pin EN of the first chip U1 is connected with the resistors R15 and R16 and is in an enabled state, +12v-M VCC circuit 113 outputs a target voltage VCC, otherwise, the charging control circuit 101 in fig. 3 is similar to the charging control circuit 101 in fig. 2, except that the coil power of the relay K2 is adjusted to +12v-M, and the driving control is adjusted to the main control of the main board main control chip MCU 1.

The third chip U3 in the VEE-to- +15v-M circuit 110 of fig. 3 is connected to the main control chip MCU1 via the enable pin EN (network EN-CTRL), and the third chip U3 is enabled when the MCU1 outputs a high level, and EN is grounded via the resistor R19 and is in a disabled state when the MCU1 outputs a low level, or when the MCU1 is in a non-power state (i.e., the output VCC voltage of the +12v-to-M-to-VCC circuit is 0V).

According to another specific embodiment of the present application, there is also provided an air conditioner including an integral type variable frequency home appliance, which is the integral type variable frequency home appliance of the above embodiment.

According to another specific embodiment of the present application, a control method of an integrated variable frequency home appliance is provided. Specifically, the method comprises the following steps:

s01: receiving a shutdown signal, wherein the shutdown signal is used for closing a target electrical appliance;

s02: generating a control strategy set based on the shutdown signal, wherein the control strategy set is used for controlling the working state of a target component of the target electric appliance to meet a preset condition (the preset condition can be an initial position of the target component, and the initial position can be judged through an initial angle); s03: and under the condition that the working state of the target component meets the preset condition, the relay K1 in the charging circuit is controlled to be disconnected, the relay K2 in the charging circuit is controlled to be disconnected, the standby signal port of the main controller of the display panel is controlled to output a low-level signal, and the target electrical appliance enters a standby mode. The power supply scheme of the single switch power supply and the multiple output loops is adopted by the household appliance, so that low-power standby can be realized, and the output voltages of the multiple output loops of the switch power supply can be kept stable when normal operation is switched to standby. Wherein, the household appliance can be an integral variable frequency air conditioner.

Specifically, the control strategy set includes a first control strategy and a second control strategy, the target assembly includes a first target assembly and a second target assembly, the first control strategy is used for controlling the first target assembly to stop, the second control strategy is used for controlling the second target assembly to reset to an initial angle and closing the second target assembly, and the first target assembly includes at least one of the following: a compressor and a fan, the second target assembly comprising at least one of: an electronic expansion valve and a stepping wind sweeping motor.

Further, the control method further includes: receiving a starting signal, wherein the starting signal is received and acquired by a man-machine interaction circuit 205 of the display panel; the standby control port of the main control MCU2 of the display panel outputs a high-level signal; the first chip U1 of the +12V-M-to-VCC circuit 113 and the third chip U3 of the VEE-to- +15V-M circuit 110 are controlled to be enabled based on the high-level signal, and the relay K2 is controlled to be closed; judging whether the voltage of the rectification correction circuit 102 reaches a preset value; when it is determined that the voltage of the rectifying and correcting circuit 102 reaches the preset value, the relay K1 is controlled to be closed, and the second target component is controlled to be reset to the initial position and then is controlled to rotate to the target position. The arrangement is such that the output voltages of the output circuits of the switching power supply can be kept stable when the standby is switched to normal operation.

Specifically, the control method further includes: acquiring operation parameters of the target electrical appliance, wherein the operation parameters comprise load parameters controlled by the main board 100 and load parameters controlled by the display board 200; whether to turn on the dynamic load circuit 114 and the dynamic load circuit 202 is determined based on the operating parameters. The arrangement can realize that the output voltages of a plurality of output loops of the switching power supply are kept stable when in normal operation. The operation parameters include, but are not limited to, parameters such as the operation conditions of a compressor and a fan, the operation conditions of a stepping wind sweeping motor, the operation conditions of an electronic expansion valve, the operation conditions of a relay, the operation conditions of a UV lamp, the operation conditions of various chips and the like.

In another embodiment of the present application, as shown in fig. 4, the method comprises the steps of:

s200, the man-machine interaction circuit 205 of the display panel receives a starting signal and enters step S201;

s201, a standby control port of a main control MCU2 of the display panel outputs a high level, after the high level is converted by a control conversion circuit 117 of the main board, a relay K2 is closed for charging, meanwhile, a first chip U1 is enabled to output VCC, the main control MCU1 is enabled to work by power reset, a third chip U3 is enabled by VCC (or the main control MCU1 outputs the high level), a normal voltage +15V-M is output, and step S202 is entered;

S202, after the main control MCU1 is powered on and reset to work normally, establishing communication with a display panel, and entering step S203;

s203, judging whether the +VDC2 voltage of the rectification correction circuit 102 meets a preset value, if so, proceeding to step 204; if not, returning to the step S203; the preset value can be a set voltage threshold value, and the size of the preset value can be set according to actual requirements;

s204, the +VDC2 voltage of the rectification correction circuit 102 reaches a preset value, and the main control MCU1 of the main board controls the coil of the relay K1 to work, and contacts of the relay K1 are closed; the relay K1 and the relay K2 are in working states, namely, the +12V-M and +12V-D loops are not in a light load state, and when other loads of +12V-M and +12V-D are actually operated and adjusted, the voltage fluctuation of the non-feedback power supply loop +12V-M is small;

s205, resetting the electronic expansion valve and the stepping wind sweeping motor to an initial angle to close and then opening the electronic expansion valve and the stepping wind sweeping motor to a set angle;

s206, the controller enters a normal working state, executes a set working mode, judges according to actual conditions, and starts the dynamic load circuit 114 or the dynamic load circuit 202 to keep the voltage of the non-feedback output loop stable;

s207, receiving a shutdown signal, and entering step S208;

S208, controlling loads such as a compressor, a fan and the like to stop working, wherein the loads comprise dynamic loads, and then entering step S209;

s209, controlling the electronic expansion valve and the stepping wind sweeping motor to reset to an initial angle to be closed, and entering step S210;

s210, a main control MCU1 of the main board controls a driving signal of a relay K1 to output a low level, the relay K1 does not work, contacts of the relay K are disconnected, and step S211 is performed;

s211, a standby signal port of a main control MCU2 of the display panel outputs a low level, after the low level is converted by a control conversion circuit 117 of the main board, the first chip U1 and the third chip U3 are not enabled, VCC and +15V-M are all 0V, meanwhile, a relay K2 is not operated, and contacts of the relay K2 are disconnected, so far, three output loops of a switching power supply of the main board 100 only have +12V-D with loads and are light loads, +12V-M, VEE are all in idle states, a high-power compressor, a direct-current fan and related control circuits are all in a power-off state, and the power is 0;

s212, the controller enters a standby state, and the standby power consumption of the whole controller is low, namely, the household appliance enters a standby mode at the moment.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition to the foregoing, references in the specification to "one embodiment," "another embodiment," "an embodiment," etc., mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment described in general terms in the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is intended that such feature, structure, or characteristic be implemented within the scope of the invention.

In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An integrated variable frequency household appliance, comprising:

the main board (100), the main board (100) is provided with a switching power supply primary circuit (107), a switching power supply feedback circuit (108), a charging control circuit (101) and a switching power supply secondary output circuit (109), the switching power supply secondary output circuit (109) at least comprises a +12V-D output end and a +12V-M output end, wherein the output end of the switching power supply feedback circuit (108) is connected with the switching power supply primary circuit (107), the input end of the switching power supply feedback circuit (108) is connected with the +12V-D output end, a loop where the +12V-D output end is located is an isolation safety loop, the reference ground of the +12V-D output end is weak current, the loop where the +12V-M output end is located is a strong current loop, and the reference ground of the +12V-M output end is strong current;

the display panel (200), the said display panel (200) is connected with said main board (100) through the said +12V-D output end, the said main board (100) is supplied with power to the load of the said display panel (200) side at least through the said +12V-D output end, the said +12V-M output end is used for supplying power to the load of the said main board (100) side, the said display panel (200) communicates with said main board (100) through the communication circuit of the said main board (100);

The household appliance is provided with a standby mode and a working mode, and the main control MCU1 of the main board (100) and the main control MCU2 of the display board (200) control the household appliance to be in the standby mode, and the other output ends of the secondary output circuit (109) of the switching power supply are in an idle state under the condition that a loop where the +12V-D output end is located is in a light load state.

2. The integrated variable frequency household appliance according to claim 1, wherein the main control MCU1 of the main board (100) controls the household appliance to be in the standby mode, including controlling at least one relay in the charging control circuit (101) to be turned off, the standby signal port of the main control MCU2 of the display panel (200) outputs a low level signal, the low level signal is converted by the control conversion circuit (117) to disable a chip of the main board (100), and the household appliance enters the standby mode.

3. The integrated variable frequency household appliance according to claim 2, wherein the main board (100) is further provided with a rectification correction circuit (102), the charging control circuit (101) comprises a relay K1 and a relay K2, the input end of the relay K1 and the input end of the relay K2 are connected with a power live wire, the relay K1 and the relay K2 are connected with the rectification correction circuit (102), and at least one of the relay K1 and the relay K2 is connected with the +12v_m output end of the main board (100).

4. A unitary variable frequency household appliance according to claim 3, wherein said control switching circuit (117) comprises:

the access terminal is used for receiving an electric signal sent by the display panel (200), wherein the electric signal comprises at least one of a high-level signal and a low-level signal;

the base B of the first triode is connected with the access terminal through a resistor R11;

the base electrode B of the second triode is connected with the collector electrode C of the first triode through a resistor R10;

the base B of the third triode is connected with the collector C of the second triode through a resistor R8, the emitter E of the third triode is connected with the emitter E of the first triode, the emitter E of the third triode and the emitter E of the first triode are arranged in a weak current mode, the collector C of the third triode is connected with the relay K2, the relay K2 is connected with the +12V-D output end, and the relay K1 is connected with the +12V-M output end;

and a base B of the fourth triode is connected with a collector C of the second triode through a resistor R18, the collector C of the fourth triode is connected with the positive end of the input side of the optocoupler U2 and is connected with an emitter E of the second triode through a resistor R7, the emitter E of the second triode is connected with the VDD output end of the display panel (200), the emitter E of the fourth triode is connected with the negative end of the input side of the optocoupler U2 of the control conversion circuit (117) and is arranged in a weak current way, the emitter E of the output side of the optocoupler U2 is connected with a strong current way, and the collector C of the output side of the optocoupler U2 is connected with the EN pin of the chip U1 through a resistor R6.

5. A unitary variable frequency household appliance according to claim 3, wherein said control switching circuit (117) comprises:

the base B of the third triode is connected with the collector C of the second triode through a resistor R8, the emitter E of the third triode is connected with the emitter E of the first triode, the emitter E of the third triode and the emitter E of the first triode are arranged in a weak current mode, the collector C of the third triode is connected with the +12V-D output end through a resistor R17, and the relay K1 and the relay K2 are connected with the +12V-M output end;

the base B of the fourth triode is connected with the collector C of the second triode through a resistor R18, the collector C of the fourth triode is connected with the positive end of the input side of the optocoupler U2, and is connected with the emitter E of the second triode through a resistor R7, the emitter E of the second triode is connected with the VDD output end of the display panel (200), the emitter E of the fourth triode is connected with the negative end of the input side of the optocoupler U2 of the control conversion circuit (117) and is arranged in weak current, the emitter E of the output side of the optocoupler U2 is connected with strong current ground, the collector C of the output side of the optocoupler U2 is connected with the EN pin of the chip U1, the EN pin of the chip U1 is connected with the output end of +12V-M through a resistor R15, and the EN pin of the chip U1 is connected with strong current ground through a resistor R16.

6. The integrated variable frequency household appliance according to claim 4 or 5, wherein the control switching circuit (117) further comprises:

the resistor R9 is connected with the base electrode B of the second triode, and the other end of the resistor R9 is connected with the emitter electrode E of the second triode;

and/or the number of the groups of groups,

and one end of the capacitor C16 is connected with the positive end of the input side of the optical coupler U2, and the other end of the capacitor C16 is connected with the negative end of the input side of the optical coupler U2.

7. The integrated variable frequency household appliance according to claim 6, wherein the main board (100) is further provided with a +12v-M VCC circuit (113), the output of the optocoupler U2 is connected with the +12v-M VCC circuit (113), the +12v-M VCC circuit (113) is provided with a first chip U1, the +12v-M VCC circuit (113) has a +12v-M VCC output, the +12v-M VCC output is connected with at least one of a dynamic load circuit (114) and other loads (115) of VCC, the +12v-M VCC circuit (113) is electrically connected with the main control MCU1, wherein after the access terminal of the control conversion circuit (117) receives the electrical signal, the control conversion circuit (117) converts the electrical signal into a first signal for controlling the relay K2 to be closed for charging and a second signal for enabling the +12v-M VCC circuit to output a target voltage.

8. The integrated variable frequency household appliance of claim 7, wherein the switching power supply secondary output circuit (109) further comprises a VEE output terminal, the display panel (200) further comprises a master control MCU2 and a peripheral minimum circuit (206) thereof, the main board (100) further comprises a communication circuit (116) with the display panel and a VEE-to- +15v-M circuit (110), the VEE-to- +15v-M circuit (110) comprises a third chip U3, the VEE-to- +15v-M circuit (110) is connected with the VEE output terminal, and is connected with the output terminal of the +1v-M VCC circuit (113), the VEE-to- +15v-M circuit (110) has a +15v-M output terminal for connection with a peripheral load on the main board (100) side, the peripheral load on the main board (100) comprises at least a compressor IPM module and a blower IPM module, the communication circuit (116) with the display panel is connected with the master control circuit VCC, the circuit (113) is electrically connected with the VCC-to the display panel, and the +1v-M circuit (113) is electrically connected with the display panel, the +1v-to-M circuit (113) can be reset, and the voltage can be controlled from the +1v-M circuit (113), causing it to output the target voltage.

9. The integrated variable frequency household appliance of claim 8, wherein a high voltage frequency converter is provided in the switching power supply secondary output circuit (109), the high voltage frequency converter having a common output winding NP1, an output winding NP2, the output winding NP2 comprising a common output winding NP1, an output winding NP3, wherein the common output winding NP1 is provided corresponding to the +12v-M output, the output winding NP2 is provided corresponding to the VEE output, and the output winding NP3 is provided corresponding to the +12v-D output.

10. The integrated variable frequency home appliance of claim 9, wherein the integrated variable frequency home appliance comprises,

11. The integrated variable frequency household appliance of claim 8, wherein the display panel (200) further comprises a +12v-D load (201), a dynamic load circuit (202), a +12v-D to VDD circuit (203), other loads of VDD (204) and a human-computer interaction circuit (205), wherein the +12v-D load (201), the dynamic load circuit (202) and the +12v-D to VDD circuit (203) are connected to the +12v-D output, the +12v-D to VDD circuit (203) output comprises the VDD output, the VDD output is connected to the master MCU2, the dynamic load circuit (202), the VDD load and the human-computer interaction circuit (205), respectively, and the human-computer interaction circuit (205) is connected to the master MCU 2.

12. The integrated variable frequency household appliance according to claim 1, wherein the main board (100) is further provided with a switching power supply rectifying circuit (106) and a switching power supply primary circuit (107), the switching power supply rectifying circuit (106) is connected with an external power supply, the switching power supply primary circuit (107) is connected with the switching power supply rectifying circuit (106), and the switching power supply primary circuit (107) is connected with the switching power supply and the switching power supply secondary output circuit (109).

13. The integrated variable frequency household appliance of claim 1, wherein the total power output of the household appliance during the standby mode is P, wherein P is less than or equal to 0.5W.

14. An air conditioner comprising an integrated variable frequency home appliance, characterized in that the integrated variable frequency home appliance is an integrated variable frequency home appliance as claimed in any one of claims 1 to 13.

15. A control method of an integrated variable frequency household appliance, the method comprising:

receiving a shutdown signal, wherein the shutdown signal is used for closing a target electrical appliance;

generating a control strategy set based on the shutdown signal, wherein the control strategy set is used for controlling the working state of a target component of the target electric appliance to meet preset conditions;

And under the condition that the working state of the target component meets the preset condition, controlling the relay K1 in the charging circuit to be disconnected, controlling the relay K2 in the charging circuit to be disconnected, controlling the standby signal port of the main controller of the display panel to output a low-level signal, and enabling the target electric appliance to enter a standby mode.

16. The control method of claim 15, wherein the set of control strategies includes a first control strategy for controlling the first target component to shut down and a second control strategy for controlling the second target component to reset to an initial angle and shut down, the target component including a first target component and a second target component, wherein the first target component includes at least one of: a compressor and a fan, the second target assembly comprising at least one of: an electronic expansion valve and a stepping wind sweeping motor.

17. The control method according to claim 16, characterized in that the control method further comprises:

receiving a starting signal, wherein the starting signal is received and acquired by a man-machine interaction circuit (205) of a display panel;

Controlling the display panel to output a high-level signal;

controlling the first chip U1 and the third chip U3 to be enabled based on the high-level signal, and controlling the relay K2 to be closed;

judging whether the voltage of the rectification correction circuit (102) reaches a preset value or not;

and under the condition that the voltage of the rectification correction circuit (102) reaches a preset value, controlling the relay K1 to be closed, controlling the second target assembly to reset to the initial position, and controlling the second target assembly to rotate to the target position.

18. The control method according to claim 16, characterized in that the control method further comprises:

acquiring operation parameters of the target electrical appliance, wherein the operation parameters comprise load parameters controlled by a main board (100) and load parameters controlled by a display board (200);

and judging whether to start the dynamic load circuit or not based on the operation parameters.