Low-power-consumption control circuit of household electrical appliance

Abstract

The utility model provides a low-power-consumption control circuit of a household electrical appliance. Comprising a filtering module used for filtering an input power supply, a switch module used for controlling the on-off of the input power supply, a control module used for monitoring the operation state of the household electrical appliance and controlling the switch module, and a power supply conversion module used for converting the input power supply into a low-voltage power supply required by the control module. The switch module comprises a door control switch used for detecting the operation state of the household electrical appliance and a relay driving circuit used for realizing on-off of an input power supply, and when a door of the household electrical appliance is in an open state, the door control switch is closed and sends a signal to the control module, so that the household electrical appliance is powered on and quits a low-power-consumption state; when the household appliance is in a non-operation state and the door is closed for a period of time, the control module controls the relay driving circuit to be disconnected, the input power supply is cut off, and the household appliance enters a low-power-consumption state. The household electrical appliance can be automatically powered on or enter a low-power-consumption state according to the state, so that the use convenience and experience are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of household appliances, in particular to a low power consumption control circuit of household appliances. Background Art

[0002] Cooking appliances are usually plugged into a power source and are closed when not in use. The power consumption of these appliances ranges from 1 watt to 5 watts, resulting in a huge waste of electricity and adding unnecessary electricity bills to every household.

[0003] Chinese patent document No. CN202735879U disclosed a standby circuit for a cooking appliance in 2012, specifically including a 5V power cut-off circuit, which is arranged between a 5V load and a 5V power supply; and a main control chip, which is connected to the 5V power cut-off circuit, and is used to control the 5V power cut-off circuit to cut off the power supply of the 5V load when receiving a shutdown signal or a standby signal. In the above-mentioned patent document, although the solution can achieve low-power standby, it has high cost and complex circuit.

[0004] Therefore, further improvement is needed. Utility Model Content

[0005] Based on this, the purpose of the utility model is to provide a low-power consumption control circuit for household appliances to overcome the deficiencies in the prior art. The circuit has a simple structure and can greatly reduce the power consumption of cooking appliances.

[0006] A low-power consumption control circuit for a household appliance designed for this purpose comprises a filtering module for filtering an input power supply, a switch module for controlling the on and off of the input power supply, a control module for monitoring the operating state of the household appliance and controlling the switch module, and a power conversion module for converting the input power supply into a low-voltage power supply required by the control module. The switch module comprises a gate-controlled switch for detecting the operating state of the household appliance and a relay drive circuit for realizing the on and off of the input power supply. When the door of the household appliance is in an open state, the gate-controlled switch is closed and a signal is sent to the control module to power on the household appliance and exit the low-power consumption state. When the household appliance is in a non-operating state and the door is closed for a period of time, the control module controls the relay drive circuit to disconnect, cut off the input power supply, and put the household appliance into a low-power consumption state.

[0007] The low-power control circuit also includes a socket input end, the filter module is located between the AC input end and the socket input end, the filter module is connected to the L1 pin and the N1 pin of the socket input end, and the L2 pin and the N2 pin of the socket input end are electrically connected to the gate switch and the power conversion module.

[0008] The control module includes a main control MCU for receiving the state signal of the gate switch and controlling the opening and closing of the relay drive circuit, the gate switch has an input terminal f, a first output terminal g, a second output terminal h, and a switching mechanism for switching the input terminal f to be connected with the first output terminal g and the second output terminal h, the power conversion module has an x ​​terminal, a y terminal and a z terminal, the main control MCU has a u terminal, a v terminal and an i terminal, the relay drive circuit has a driving mechanism and a switching mechanism that are mutually linked, the driving mechanism has a c terminal and a b terminal, and the switching mechanism has The d end and the e end of the socket input end are electrically connected to the d end of the switch mechanism and the input end f of the gate switch respectively, the N2 end of the socket input end is electrically connected to the X end of the power conversion module, the y end of the power conversion module is electrically connected to the u end of the main control MCU, the z end of the power conversion module is electrically connected to the first output end g of the gate control switch and the e end of the switch mechanism respectively, the c end of the drive mechanism is electrically connected to the v end of the main control MCU, and the b end of the drive mechanism is electrically connected to the i end of the main control MCU.

[0009] The filtering module includes a live wire input terminal LIN, a neutral wire input terminal NIN, a live wire output terminal LOUT and a neutral wire output terminal NOUT, a fuse FUSE, a capacitor C1, a capacitor C2, a capacitor C3, a first induction coil L and a resistor R1. The live wire input terminal LIN, the fuse FUSE, the capacitor C1 and the neutral wire input terminal NIN are connected in series in sequence, and both ends of the capacitor C1 are connected in parallel with the input end of the first induction coil L. The live wire output terminal LOUT, the capacitor C3, the capacitor C2 and the neutral wire output terminal NOUT are connected in series in sequence, and both ends of the capacitor C3 and the capacitor C2 after being connected in series are respectively connected in parallel with the resistor R1 and the output end of the first induction coil L. A grounding terminal is provided between the capacitor C2 and the capacitor C3, the live wire output terminal LOUT is electrically connected to the L1 pin of the socket input terminal, and the neutral wire output terminal NOUT is electrically connected to the N1 pin of the socket input terminal.

[0010] The power conversion module includes a transformer for converting the input power supply AC power into high-voltage DC power, a rectifier circuit for converting the high-voltage DC power into low-voltage DC power, and a voltage stabilizing circuit for stabilizing the low-voltage DC voltage.

[0011] The door-controlled switch includes a mechanical switch or a sensor for detecting a switch state of the household appliance.

[0012] Compared with the prior art, the low power consumption control circuit of the household appliance in the above embodiment has the following advantages:

[0013] When the household appliance is powered on for the first time and the door is in a closed state, the door control switch is disconnected, and the relay drive circuit is in a disconnected state because it does not receive a signal from the control module. The input power cannot enter the power conversion module to power the household appliance, so that the household appliance is in a low power consumption state to avoid unnecessary energy consumption;

[0014] When the door of the household appliance is opened, the door control switch is closed, the input voltage is connected to the power conversion module, and the low-voltage power is provided to the control module. The control module receives the state signal of the door control switch, controls the relay drive circuit to close, and powers on the household appliance and exits the low-power state, ready to perform operations;

[0015] After the household appliance is powered on, the door of the household appliance is closed, and the door control switch is disconnected, but the control module continues to send a control signal to keep the relay drive circuit closed, so that the household appliance continues to be powered on and works normally;

[0016] If the household appliance is not operated for a long time after being powered on, the door control switch detects that the door of the household appliance is closed and no operation is performed, and the control module stops sending control signals, disconnects the relay drive circuit, cuts off the input voltage, and makes the household appliance re-enter the low power consumption state; BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and the description thereof are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 This is a low power consumption schematic diagram of a microwave oven in one embodiment of the utility model.

[0020] Figure 2 This is a circuit diagram of a filter module in one embodiment of the utility model.

[0021] Figure 3 This is a circuit diagram of a relay driving circuit in one embodiment of the utility model.

[0022] Figure 4 This is a circuit diagram of the main control MCU in one embodiment of the utility model.

[0023] Figure 5 This is a circuit diagram of a power conversion module in one embodiment of the utility model.

[0024] Figure 6 This is a circuit diagram of a crystal oscillator circuit in one embodiment of the utility model.

[0025] Figure 7 This is a circuit diagram of a programming interface in one embodiment of the utility model.

[0026] Figure 8 It is a circuit diagram of a display interface in one embodiment of the utility model.

[0027] Fig. 9 This is a circuit diagram of an encoder in one embodiment of the utility model. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0029] like Figure 1-Figure 9 As shown, a low-power control circuit for a household appliance is provided, comprising a filter module 1 for filtering an input power supply, a switch module 2 for controlling the on and off of the input power supply, a control module 3 for monitoring the operating state of the household appliance and controlling the switch module 2, and a power conversion module 4 for converting the input power supply into a low-voltage power supply required by the control module 3. The switch module 2 comprises a gate-controlled switch 201 for detecting the operating state of the household appliance and a relay drive circuit 202 for realizing the on and off of the input power supply. When the door of the household appliance is in an open state, the gate-controlled switch 201 is closed and sends a signal to the control module 3, so that the household appliance is powered on and exits the low-power state; when the household appliance is in a non-operating state and the door is closed for a period of time, the control module 3 controls the relay drive circuit 202 to disconnect, cut off the input power supply, and put the household appliance into a low-power state.

[0030] Specifically, when using a household appliance, the user only needs to open or close the door, and the household appliance can automatically power on or enter a low-power state according to the state, thereby improving the convenience and experience of use, realizing intelligent low-power management of household appliances, and improving the energy-saving effect, safety and user experience of the appliances; after the power cord of the household appliance is plugged into a powered socket, it is powered on for the first time; when the door of the household appliance is in a closed state, the door-controlled switch 201 is in an off state, and the relay drive circuit 202 is also in an off state because it does not receive the level signal control of the control module 3, so the input voltage of the mains after passing through the filter module 1 is cut off, and the household appliance is in a low-power state at this time;

[0031] When the door of the household appliance is in an open state, the gate switch 201 is closed, the input voltage is connected, and the power enters the power conversion module 4. The power conversion module 4 provides a 5V voltage to the control module 3. After the control module 3 obtains the voltage signal, it sends a control signal to close the relay drive circuit 202. After the relay drive circuit 202 is closed, the input voltage enters the household appliance through the gate switch 201 or the relay drive circuit 202, so that the household appliance is powered on and exits the low power consumption state and enters the operable state;

[0032] After the household appliance is powered on, the door of the household appliance is closed. At this time, the door control switch 201 is disconnected, but the control module 3 continues to send a control signal, and the relay drive circuit 202 remains in a closed state. Therefore, the household appliance is still powered on and can operate normally (such as heating food);

[0033] After the household appliance is powered on and the door is closed and no operation is performed for a long time, the control module 3 will control the relay drive circuit 202 to disconnect, the input voltage is cut off, and the household appliance enters the low power consumption state again. To restart the household appliance, the door needs to be reopened to close the door control switch 201 again.

[0034] Household appliances may include microwave ovens, ovens, steamers, steam-bake ovens, microwave steam-bake all-in-one machines, rice cookers or air fryers, etc. Preferably, a microwave oven is used as an example for description in this embodiment.

[0035] Further, if Figure 1 As shown, the low power consumption control circuit also includes a socket input terminal 5, the filter module 1 is located between the AC input terminal and the socket input terminal 5, the filter module 1 is connected to the L1 pin and the N1 pin of the socket input terminal 5, and the L2 pin and the N2 pin of the socket input terminal 5 are electrically connected to the gate switch 201 and the power conversion module 4.

[0036] Specifically, the filter module 1 is responsible for processing the input AC power voltage, filtering out grid noise and fluctuations, and ensuring the stability of the output voltage; when the AC power is supplied through the socket input terminal 5, it first passes through the filter module 1, and the filtered power is transmitted through the L1 pin and N1 pin of the input terminal, and then sent from the L2 pin and N2 pin to the low-power door opening control circuit a. The low-power door opening control circuit a automatically switches to the low-power mode, which can significantly reduce the energy consumption of the device when it is not in use.

[0037] Further, if Figure 1As shown, the control module 3 includes a main control MCU 301 for receiving a state signal of the gate switch 201 and controlling the opening and closing of the relay drive circuit 202. The gate switch 201 has an input terminal f, a first output terminal g, a second output terminal h, and a switching mechanism for switching the input terminal f to be connected with the first output terminal g and the second output terminal h. The power conversion module 4 has an x ​​terminal, a y terminal, and a z terminal. The main control MCU 301 has a u terminal, a v terminal, and an i terminal. The relay drive circuit 202 has a driving mechanism and a switch mechanism that are mutually linked. The driving mechanism has a c terminal and a b terminal. The switch mechanism The structure has a d end and an e end, the L2 pin of the socket input terminal 5 is electrically connected to the d end of the switch mechanism and the input terminal f of the gate switch 201 respectively, the N2 end of the socket input terminal 5 is electrically connected to the X end of the power conversion module 4, the y end of the power conversion module 4 is electrically connected to the u end of the main control MCU301, the z end of the power conversion module 4 is electrically connected to the first output terminal g of the gate switch 201 and the e end of the switch mechanism respectively, the c end of the driving mechanism is electrically connected to the v end of the main control MCU301, and the b end of the driving mechanism is electrically connected to the i end of the main control MCU301.

[0038] Specifically, the oven door of the microwave oven is in an open state: when the oven door of the microwave oven is in an open state, the input terminal f of the gate-controlled switch 201 is connected to the first output terminal g, the mains power is connected to the input terminal f of the gate-controlled switch 201 through the L2 pin of the socket input terminal 5, and then reaches the z terminal of the power conversion module 4 through the first output terminal g; the power conversion module 4 converts the mains power into a low-voltage power supply (such as 5V), and supplies power to the u terminal of the main control MCU 301 through the y terminal; the microwave oven is powered on and exits the low-power state. After the main control MCU 301 obtains the low-voltage power supply, it can control the microwave oven to work and also send a control signal to control the driving mechanism of the relay drive circuit 202 through the v terminal and the i terminal. The driving mechanism controls the opening and closing of the switch mechanism to close the relay drive circuit 202; after the relay drive circuit 202 is closed, the input power of the mains power after passing through the filter module 1 can enter the power conversion module through the gate-controlled switch 201, and can also enter the main circuit of the microwave oven through the L2 pin and the N2 pin of the socket input terminal 5 through the relay drive circuit 202. Powers up the microwave oven and exits the low power consumption state into an operational state.

[0039] Closing the oven door after the microwave oven is powered on: After the microwave oven is powered on, the oven door of the microwave oven is closed. At this time, the input terminal f of the door control switch 201 is connected to the second output terminal h, but because the main control MCU301 continues to send a control signal, the relay drive circuit 202 remains in a closed state. Therefore, the microwave oven is still powered on and can operate normally (such as heating food).

[0040] Standby state: If the microwave oven door is closed after being powered on and no operation is performed for a long time, the main control MCU301 will control the driving mechanism of the relay drive circuit 202 to disconnect the relay drive circuit 202; after the relay drive circuit 202 is disconnected, the input voltage is cut off, and the household appliance enters the low power consumption state again.

[0041] If the microwave oven is to be restarted, the oven door needs to be reopened so that the input terminal f of the door-controlled switch 201 is connected to the first output terminal g again.

[0042] Further, if Figure 3 and Figure 4 As shown, the relay driving circuit 202 includes relay RY1, relay RY2, relay RY3, relay RY4, relay RY5, transistor Q1, gate control socket door, resistor R15, resistor R17, resistor R18, resistor R23, resistor R21, resistor R22, diode D15, capacitor CZ0 and chip IC2; the main control MCU302 includes chip IC3.

[0043] Specifically, the model of chip IC3 is: IC-SH79F1617.

[0044] Specifically, the model of chip IC2 is: ULN2003CB.

[0045] Pin 1 of the gate control socket door is connected to the emitter of transistor Q1, and the collector of transistor Q1 is connected in series with pins 1 of relay RY1, relay RY2 and relay RY3 respectively;

[0046] Pin 2 of relay RY1 is connected to pin 16 of chip IC2; pin 2 of relay RY2 is connected to pin 15 of chip IC2; pin 2 of relay RY3 is connected to pin 14 of chip IC2;

[0047] The control end of relay RY1 is connected to the 16th pin of chip IC3; the control end of relay RY2 is connected to the 15th pin of chip IC3; the control end of relay RY3 is connected to the 17th pin of chip IC3; the control end of relay RY4 is connected to the 21st pin of chip IC3; the control end of relay RY5 is connected to the 18th pin of chip IC3;

[0048] Pin 1 of relay RY4 and pin 1 of relay RY5 are connected in series, pin 2 of relay RY4 is connected to pin 13 of chip IC2, pin 4 of relay RY4 is connected to pin L2 of socket input terminal 5, and pin 2 of relay RY5 is connected to pin 12 of chip IC2;

[0049] The base of transistor Q1 is connected in series with resistor R21 and diode D15, and pin 2 of gate control socket door, resistor R22 and pin 6 of chip IC2 are connected in series, and one end of resistor R21 is connected between pin 2 of gate control socket door and resistor R22.

[0050] One end of resistor R15 and resistor R18 are connected to pin 11 of chip IC2, one end of resistor R17 and resistor R23 are connected to pin 10 of chip IC2, the other end of resistor R15 and resistor R23 are connected to +5V, the other end of resistor R18 is connected to pin 19 of chip IC3, the other end of resistor R17 and one end of capacitor CZ0 are connected to pin 20 of chip IC3, and the other end of capacitor CZ0 is grounded.

[0051] Specifically, transistor Q1 is used to control the on and off of relays RY1, RY2, and RY3. Relays RY1, RY2, RY3, RY4, and RY5 control the power-on status of different circuit parts and respond to the control command of the main control MCU302. When the state of the door control seat door changes, the signal is transmitted to the chip IC2 through the resistor R22. The signal processed by the chip IC2 is adjusted by the resistor R21 and the diode D15 to control the switch state of the transistor Q1. The on and off of the transistor Q1 directly affects the working state of the relays RY1, RY2, and RY3, thereby controlling the on and off of the corresponding circuits.

[0052] Chip IC2 is a ULN2003 Darlington tube. 12V is supplied through pin 9. According to the signals from pins 1 to 7, the control relays RY1, RY2, RY3, RY4, and RY5 are turned on and off. The 5V lines R15, R23, R18, and R17 play the role of pulling up and preventing misjudgment in the detection circuit.

[0053] Further, if Figure 2 As shown, the filtering module 1 includes a live wire input terminal LIN, a neutral wire input terminal NIN, a live wire output terminal LOUT and a neutral wire output terminal NOUT, a fuse FUSE, a capacitor C1, a capacitor C2, a capacitor C3, a first induction coil L and a resistor R1. The live wire input terminal LIN, the fuse FUSE, the capacitor C1 and the neutral wire input terminal NIN are connected in series in sequence, and both ends of the capacitor C1 are connected in parallel with the input end of the first induction coil L. The live wire output terminal LOUT, the capacitor C3, the capacitor C2 and the neutral wire output terminal NOUT are connected in series in sequence, and both ends of the capacitor C3 and the capacitor C2 after being connected in series are respectively connected in parallel with the resistor R1 and the output end of the first induction coil L. A grounding terminal is provided between the capacitor C2 and the capacitor C3, the live wire output terminal LOUT is electrically connected to the L1 pin of the socket input terminal 5, and the neutral wire output terminal NOUT is electrically connected to the N1 pin of the socket input terminal 5.

[0054] Specifically, the current enters the filter module 1 from the AC power through the live wire input terminal LIN, first passes through the fuse, and when the current is normal, continues to flow through the capacitor C1 for preliminary high-frequency noise filtering. The capacitor C1 is connected in parallel to the first induction coil L to further enhance the noise suppression effect; the processed current passes through the live wire output terminal LOUT and is additionally filtered by capacitors C3 and C2 to improve the stability of the power supply, and then flows to the L1 pin of the socket input terminal; at the same time, the neutral wire NIN is directly connected to the neutral wire output terminal NOUT, and finally flows to the N1 pin of the socket input terminal; the fuse FUSE acts as an overload protection in the circuit. When the current passing through exceeds the set value, the fuse blows, thereby cutting off the power supply to prevent overcurrent from damaging subsequent circuit components.

[0055] Further, if Figure 5 As shown, the power conversion module 4 includes a transformer for converting input power into low-voltage AC power, a rectifier circuit 401 for converting low-voltage AC power into low-voltage DC power, and a voltage stabilizing circuit 402 for stabilizing the low-voltage DC voltage.

[0056] Further, if Figure 3 and Figure 5 As shown, the power conversion module 4 includes an AC power input socket AC_IN, and the rectifier circuit 401 includes a first varistor RV1, a second varistor RZ1, a third varistor RZ2, an adjustable resistor VR1, a bridge stack IC4, an optical coupler UZ1, a second induction coil L1, an electrolytic capacitor EC1, an electrolytic capacitor EC2, and a capacitor CZ1; the voltage stabilizing circuit 402 includes an optical coupler UZ2, an electrolytic capacitor EC5, a transformer T1, a chip IC1, an electrolytic capacitor EC3, an electrolytic capacitor EC4, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C5, a capacitor C7, a safety capacitor CY1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R10, a diode D9, a diode D10, a diode D11, a diode D12, and a voltage stabilizing diode ZD1;

[0057] The N2 pin of the socket input terminal 5 is connected to the 3 pin of the AC power input socket AC_IN, the 2 pin of the AC power input socket AC_IN is connected to the 3 pin of the relay RY4, and the 5 pin of the AC power input socket AC_IN is connected to the 4 pin of the relay RY5;

[0058] One end of the first varistor RV1 is connected to one end of the adjustable resistor VR1 and pin 1 of the bridge stack IC4, the other end of the first varistor RV1 is connected to pin 1 of the AC power input socket AC_IN, and pin 4 of the AC power input socket AC_IN is connected to the other end of the adjustable resistor VR1 and pin 2 of the bridge stack IC4;

[0059] Pin 1 of the optocoupler UZ1 is connected to one end of the second varistor RZ1, the other end of the second varistor RZ1 is connected to the other end of the adjustable resistor VR1, pin 2 of the optocoupler UZ1 is grounded, pin 3 of the optocoupler UZ1, the third varistor RZ2, and the capacitor CZ1 are connected in series and grounded in sequence, pin 7 of the chip IC2 is connected between the third varistor RZ2 and the capacitor CZ1, and pin 4 of the optocoupler UZ1 is connected to +5V;

[0060] One end of the second induction coil L1 is connected to the negative electrode of the electrolytic capacitor EC1 and the 3rd pin of the bridge stack IC4, the other end of the second induction coil L1 is connected to the negative electrode of the electrolytic capacitor EC2 and grounded, the 4th pin of the bridge stack IC4 is connected in series with the positive electrode of the electrolytic capacitor EC1, the positive electrode of the electrolytic capacitor EC2, the resistor R1, the resistor R2, one end of the capacitor C1 and the 1st pin of the transformer T1, the other end of the resistor R1, the resistor R2 and the capacitor C1 are all connected to the negative electrode of the diode D10, the positive electrode of the diode D10 is connected to the 3rd pin of the transformer T1, one end of the safety capacitor CY1 is connected to one end of the capacitor C1, and the other end of the safety capacitor CY1 is grounded;

[0061] Pin 4 of transformer T1 is connected to the positive electrode of diode D9, the negative electrode of diode D10 is connected to one end of resistor R3, the other end of resistor R3 is connected to the positive electrode of electrolytic capacitor EC3, one end of capacitor C2 and pin 3 of chip IC1, the negative electrode of electrolytic capacitor EC3 and the other end of capacitor C2 are grounded;

[0062] Resistor R4, resistor R5, pin 1 of chip IC1 and pin 2 of chip IC1 are connected in parallel and then grounded;

[0063] Pin 5 of chip IC1, pin 6 of chip IC1, pin 7 of chip IC1 and pin 8 of chip IC1 are connected in series and then connected to pin 3 of transformer T1 and the positive electrode of diode D10;

[0064] Pin 10 of transformer T1 is connected to one end of resistor R10 and the positive electrode of diode D12, the other end of resistor R10 is connected to one end of capacitor C7, the other end of capacitor C7 and the negative electrode of diode D12 are connected to the positive electrode of electrolytic capacitor EC5 and one end of resistor R8 and connected to +12V, the negative electrode of electrolytic capacitor EC5 and the other end of resistor R8 are grounded;

[0065] Pin 9 of transformer T1 is connected to the cathode of diode D11, the anode of electrolytic capacitor EC4, resistor R6 and one end of capacitor C5 and connected to pin 6 of chip IC3, pin 8 of transformer T1 is connected to the anode of diode D11, and pin 6 of transformer T1 is connected to the cathode of electrolytic capacitor EC4;

[0066] The other end of the resistor R6, the voltage zener diode ZD1 and the resistor R7 are connected in series and grounded;

[0067] Pin 1 of the optocoupler UZ2 is connected between the voltage zener diode ZD1 and the resistor R7, pin 2 of the optocoupler UZ2 is grounded, pin 3 of the optocoupler UZ2 is grounded, pin 4 of the optocoupler UZ2 and pin 4 of the chip IC1 are respectively connected to one end of the capacitor C3, and the other end of the capacitor C3 is grounded.

[0068] Specifically, when the AC power is input through AC_IN, the power is turned on or off by the control of relays RY4 and RY5; the current is first adjusted and protected by the adjustable resistor VR1 and the varistor RV1, and then flows into the bridge stack IC4, and the chip converts the AC into DC; the converted DC voltage is further adjusted by the varistor RZ1, and then transmitted to the main control circuit by the optocoupler UZ1. The optocoupler UZ1 ensures the safe isolation of the signal to prevent high voltage from damaging the control circuit; the optocoupler UZ1 is connected to the chip IC2 through the capacitor CZ1 and the varistor RZ2 to ensure stable and clear signal transmission.

[0069] Chip IC1 works together with transformer T1 to ensure the accuracy and stability of power output by finely regulating current and voltage.

[0070] Specifically, the model of chip IC1 is: PN8147H.

[0071] Further, if Figure 4 and Figure 6 As shown, the control module 3 also includes a crystal oscillator circuit, which includes a safety capacitor CX1, a safety capacitor CX2, a wirewound resistor RX and a safety capacitor X1. The safety capacitor CX1, the safety capacitor CX2, the wirewound resistor RX and the safety capacitor X1 are connected in parallel and connected to pin 4 of the chip IC3 and pin 5 of the chip IC3.

[0072] Specifically, the crystal oscillator circuit is used to provide a stable clock signal to the main control MCU, which is the basis for the operation of the MCU.

[0073] Further, if Figure 4 and Figure 7 As shown, the control module 3 also includes a burning interface, which includes a socket CON2, wherein pin 4 of the socket CON2 is connected to pin 1 of the chip IC3, pin 5 of the chip IC3 is grounded, and pin 6 of the chip IC3 is connected to +5V.

[0074] Further, if Figure 4 and Figure 8 As shown, the control module 3 also includes a display interface, which includes a socket CON3, pin 1 of the socket CON3 is connected to +5V, pin 2 of the socket CON3 is grounded, pin 5 of the socket CON3 is connected to pin 2 of the chip IC3, and pin 6 of the socket CON3 is connected to pin 3 of the chip IC3.

[0075] Further, if Figure 4 and Fig. 9 As shown, the control module 3 also includes an encoder, which includes a socket CON4, a cathode resistor RK1, a cathode resistor RK2, a cathode resistor RK3, a cathode resistor RK4, a cathode resistor RK5, a cathode resistor RK6, a cathode resistor RK7, a cathode resistor RK8, a cathode resistor RK9, a cathode resistor RK10, a switch SW1, a switch SW2, a switch SW3, a switch SW4, a switch SW5, a contactor CK1, a contactor CK2, a contactor CK3, a contactor CK4 and a contactor CK5;

[0076] Pin 1 of socket CON4, switch SW5 and pin 22 of chip IC3 are connected in series in sequence; Pin 2 of socket CON4, switch SW4 and pin 23 of chip IC3 are connected in series in sequence; Pin 3 of socket CON4, switch SW3 and pin 24 of chip IC3 are connected in series in sequence; Pin 1 of socket CON4, switch SW2 and pin 25 of chip IC3 are connected in series in sequence; Pin 1 of socket CON4, switch SW1 and pin 26 of chip IC3 are connected in series in sequence; Pin 6 of socket CON4, cathode resistor RK5 and contactor CK5 are connected in series and grounded, and one end of cathode resistor RK6 is connected to pin 6 of socket CON4; Pin 7 of socket CON4, cathode resistor RK4 and contactor CK 4 is connected in series and grounded, one end of the cathode resistor RK7 is connected to the 7th pin of the socket CON4; the 8th pin of the socket CON4, the cathode resistor RK3, and the contactor CK3 are connected in series and grounded, one end of the cathode resistor RK8 is connected to the 8th pin of the socket CON4; the 9th pin of the socket CON4, the cathode resistor RK2, and the contactor CK2 are connected in series and grounded, one end of the cathode resistor RK9 is connected to the 9th pin of the socket CON4, the 10th pin of the socket CON4 is connected in series with the cathode resistor RK1 and the contactor CK1 and grounded, one end of the cathode resistor RK10 is connected to the 10th pin of the socket CON4; the other ends of the cathode resistors RK6, RK7, RK8, RK9 and RK10 are connected to +5V.

[0077] Furthermore, the door control switch 201 includes a mechanical switch or a sensor for detecting the switch state of the household appliance.

[0078] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0079] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0080] In the present invention, unless otherwise clearly defined and specified, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0081] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0082] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0083] It should also be understood that when explaining the connection relationship or positional relationship of elements, although not explicitly described, the connection relationship and positional relationship are interpreted as including an error range, which should be within the acceptable deviation range of a specific value determined by those skilled in the art. For example, "approximately", "approximately" or "substantially" may mean within one or more standard deviations, which are not limited here.

[0084] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0085] The above embodiments only express several implementation methods of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A low power consumption control circuit for household appliances, characterized in that: The household appliance comprises a filter module (1) for filtering an input power supply, a switch module (2) for controlling the on / off of the input power supply, a control module (3) for monitoring the operating state of the household appliance and controlling the switch module (2), and a power conversion module (4) for converting the input power supply into a low-voltage power supply required by the control module (3). The switch module (2) comprises a door-controlled switch (201) for detecting the operating state of the household appliance and a relay drive circuit (202) for realizing the on / off of the input power supply. When the door of the household appliance is in an open state, the door-controlled switch (201) is closed and sends a signal to the control module (3), so that the household appliance is powered on and exits a low power consumption state. When the household appliance is in a non-operating state and the door is closed for a period of time, the control module (3) controls the relay drive circuit (202) to be disconnected, cuts off the input power supply, and causes the household appliance to enter a low power consumption state.

2. The low power consumption control circuit for household appliances according to claim 1, characterized in that: The low power consumption control circuit further comprises a socket input terminal (5), the filter module (1) being located between the mains input terminal and the socket input terminal (5), the filter module (1) being connected to the L1 pin and the N1 pin of the socket input terminal (5), and the L2 pin and the N2 pin of the socket input terminal (5) being electrically connected to the gate-controlled switch (201) and the power conversion module (4).

3. The low power consumption control circuit for household appliances according to claim 2, characterized in that: The control module (3) comprises a main control MCU (301) for receiving a state signal of the gate-controlled switch (201) and controlling the opening and closing of the relay drive circuit (202); the gate-controlled switch (201) has an input terminal f, a first output terminal g, a second output terminal h, and a switching mechanism for switching the input terminal f to be connected with the first output terminal g and the second output terminal h; the power conversion module (4) has an x ​​terminal, a y terminal, and a z terminal; the main control MCU (301) has a u terminal, a v terminal, and an i terminal; the relay drive circuit (202) has a driving mechanism and a switching mechanism that are linked to each other; the driving mechanism has a c terminal and a b terminal; the switching mechanism has a d terminal and e ends, the L2 pin of the socket input end (5) is electrically connected to the d end of the switch mechanism and the input end f of the gate-controlled switch (201) respectively, the N2 end of the socket input end (5) is electrically connected to the X end of the power conversion module (4), the y end of the power conversion module (4) is electrically connected to the u end of the main control MCU (301), the z end of the power conversion module (4) is electrically connected to the first output end g of the gate-controlled switch (201) and the e end of the switch mechanism respectively, the c end of the drive mechanism is electrically connected to the v end of the main control MCU (301), and the b end of the drive mechanism is electrically connected to the i end of the main control MCU (301).

4. The low power consumption control circuit for household appliances according to claim 2, characterized in that: The filtering module (1) comprises a live wire input terminal LIN, a neutral wire input terminal NIN, a live wire output terminal LOUT and a neutral wire output terminal NOUT, a fuse FUSE, a capacitor C1, a capacitor C2, a capacitor C3, a first induction coil L and a resistor R1. The live wire input terminal LIN, the fuse FUSE, the capacitor C1 and the neutral wire input terminal NIN are connected in series in sequence. Both ends of the capacitor C1 are connected in parallel with the input end of the first induction coil L. The live wire output terminal LOUT, the capacitor C3, the capacitor C2 and the neutral wire output terminal NOUT are connected in series in sequence. Both ends of the capacitor C3 and the capacitor C2 connected in series are respectively connected in parallel with the resistor R1 and the output end of the first induction coil L. A ground terminal is provided between the capacitor C2 and the capacitor C3. The live wire output terminal LOUT is electrically connected to the L1 pin of the socket input terminal (5). The neutral wire output terminal NOUT is electrically connected to the N1 pin of the socket input terminal (5).

5. The low power consumption control circuit for household appliances according to claim 1, characterized in that: The power conversion module (4) comprises a transformer for converting input power supply mains electricity into high-voltage direct current, a rectifier circuit (401) for converting high-voltage direct current into low-voltage direct current, and a voltage stabilizing circuit (402) for stabilizing the low-voltage direct current voltage.

6. The low power consumption control circuit for household appliances according to claim 1, characterized in that: The door-controlled switch (201) comprises a mechanical switch or a sensor for detecting the switch state of the household appliance.

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