CN220067210U - Power supply control circuit and household appliance - Google Patents

Abstract

The utility model discloses a power supply control circuit and a household appliance, and belongs to the technical field of power supplies. The power supply control circuit includes: the first switch is arranged between the input end of the power utilization circuit and the output end of the first power supply circuit, the input end of the first power supply circuit is electrically connected with the output end of the second power supply circuit, the first power supply circuit is configured to provide a first power supply, and the second power supply circuit is configured to provide a second power supply; and the detection circuit is electrically connected with the first switch and is configured to detect the input state of the second power supply circuit and control the on-off of the first switch according to the input state. According to the power supply control circuit, the first switch is arranged to control the power supply of the first power supply circuit to the power utilization circuit of the rear stage, the detection circuit is arranged to control the on-off of the first switch, and after the power supply wire of the electric appliance is pulled out, the power supply input of the power utilization circuit is cut off by disconnecting the first switch, so that the power utilization circuit is prevented from being in a sub-working state.

Description

Power supply control circuit and household appliance

Technical Field

The utility model belongs to the technical field of power supplies, and particularly relates to a power supply control circuit and a household appliance.

Background

The supply voltage required by the MCU (Microcontroller Unit, micro control unit) in the household appliance is low, typically 3.3V or 5V. Therefore, the front end of the MCU is provided with a voltage unit for reducing the voltage, and the voltage unit reduces the output power of the front-end power supply unit to supply power for the MCU.

Because the input end and the output end of the voltage unit are conventionally provided with the capacitor, after the power line of the household appliance is pulled out, the voltage of the input end and the output end of the voltage unit can be kept for a period of time, so that the MCU is not timely powered off and is in a sub-working state. In this state, the operating logic of the MCU is easily confused, and an abnormality may occur in the electrical appliance. For example, a power indicator light of an appliance remains on after power is off, affecting the user experience.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides the power supply control circuit and the household appliance, wherein the power supply control circuit cuts off the power supply input of the power utilization circuit after the power supply wire of the appliance is pulled out, so that the power utilization circuit is prevented from being in a sub-working state.

In a first aspect, the present utility model provides a power supply control circuit comprising: the first switch is arranged between the input end of the power utilization circuit and the output end of the first power supply circuit, the input end of the first power supply circuit is electrically connected with the output end of the second power supply circuit, the first power supply circuit is configured to provide a first power supply, and the second power supply circuit is configured to provide a second power supply; and the detection circuit is electrically connected with the first switch and is configured to detect the input state of the second power supply circuit and control the on-off of the first switch according to the input state.

According to the power supply control circuit, the first switch is arranged to control the power supply of the first power supply circuit to the power utilization circuit of the rear stage, the detection circuit is arranged to control the on-off of the first switch, and after the power supply wire of the electric appliance is pulled out, the power supply input of the power utilization circuit is cut off by disconnecting the first switch, so that the power utilization circuit is prevented from being in a sub-working state.

According to one embodiment of the present utility model, a detection circuit includes: a first capacitor; the charging and discharging circuit is electrically connected with the first capacitor and is configured to detect the input state of the second power supply circuit, charge the first capacitor when the input state is power-on, and discharge the first capacitor when the input state is power-off; the driving circuit is electrically connected with the first capacitor and the first switch respectively and is configured to control the first switch to be turned on when the voltage of the first capacitor reaches the target voltage.

According to one embodiment of the present utility model, a charge and discharge circuit includes: the first end of the second switch is electrically connected with the first power supply end; the first end of the first resistor is electrically connected with the second end of the second switch, and the second end of the first resistor is electrically connected with the first end of the first capacitor; and the sampling circuit is electrically connected with the power line and is configured to control the second switch to be turned on by utilizing the power transmitted by the power line, and the power line is electrically connected with the input end of the second power circuit.

According to an embodiment of the present utility model, the charge-discharge circuit further includes: the first end of the second resistor is electrically connected with the second end of the first capacitor, the second end of the second resistor is electrically connected with the second end of the first capacitor, and the second end of the second resistor is grounded.

According to one embodiment of the utility model, the power line comprises a live wire and a neutral wire, and the sampling circuit comprises: the anode of the first diode is electrically connected with the live wire, and the cathode of the first diode is electrically connected with the second switch; the cathode of the second diode is electrically connected with the cathode of the first diode; and the first end of the third resistor is electrically connected with the anode of the second diode, and the second end of the third resistor is electrically connected with the zero line.

According to one embodiment of the utility model, the second switch is an optocoupler, the positive electrode of the luminous tube of the optocoupler is electrically connected with the negative electrode of the first diode, the negative electrode of the luminous tube of the optocoupler is electrically connected with the positive electrode of the second diode, the positive electrode of the receiving tube of the optocoupler is electrically connected with the first power end, and the negative electrode of the receiving tube of the optocoupler is electrically connected with the first end of the first resistor.

According to one embodiment of the present utility model, the charge-discharge circuit further includes a fifth resistor, a first end of the fifth resistor is electrically connected to the first end of the first resistor, and a second end of the fifth resistor is grounded.

According to one embodiment of the present utility model, the charge-discharge circuit further includes a third diode, an anode of the third diode is electrically connected to a cathode of the receiving tube of the optocoupler, and a cathode of the third diode is electrically connected to the first end of the first resistor.

According to one embodiment of the present utility model, a driving circuit includes: a sixth resistor, a first end of the sixth resistor is electrically connected with the second power supply end, a second end of the sixth resistor is electrically connected with the control end of the first switch, and the first switch is configured to be turned on when the control end is at a low level and turned off when the control end is at a high level; the first end of the third switch is electrically connected with the second end of the sixth resistor, the second end of the third switch is grounded, the control end of the third switch is electrically connected with the first end of the first capacitor, and the third switch is configured to be turned on when the control end is at a high level and turned off when the control end is at a low level.

According to one embodiment of the utility model, the first switch is a P-type MOSFET transistor and the second switch is an N-type MOSFET transistor.

In a second aspect, the present utility model provides a power supply control circuit, an input end of a first power supply circuit is electrically connected with an output end of a second power supply circuit, an output end of the first power supply circuit is electrically connected with an input end of an electric power utilization circuit, the first power supply circuit is configured to provide a first power supply, the second power supply circuit is configured to provide a second power supply, and an input end and/or an output end of the first power supply circuit is connected with a discharge resistor; the power supply control circuit includes: the first end of the fourth switch is electrically connected with the first end of the discharge resistor, and the second end of the fourth switch is grounded; and the detection circuit is connected with the fourth switch and is configured to detect the input state of the second power supply circuit, control the fourth switch to be disconnected when the input state is power-on and control the fourth switch to be connected when the input state is power-down.

According to the power supply control circuit, the fourth switch is arranged to control the discharge of the input side or the output side of the first power supply circuit, the detection circuit is arranged to control the on-off of the fourth switch, and after the power line of the electric appliance is pulled out, the fourth switch is turned on to enable the input side or the output side of the first power supply circuit to discharge, so that the power supply which is rapidly conveyed to the power supply circuit is rapidly consumed, and the power supply circuit is prevented from being in a sub-working state.

In a third aspect, the present utility model provides a household appliance comprising a power control circuit according to any one of the above embodiments.

According to the household appliance disclosed by the utility model, after the power supply is pulled out, the power supply circuit can rapidly stop supplying power to the rear-stage circuit, so that abnormal operation of equipment is avoided, and the user experience is improved.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic diagram of a power control circuit according to an embodiment of the present utility model;

FIG. 2 is a second schematic diagram of a power control circuit according to an embodiment of the present utility model;

FIG. 3 is a third schematic diagram of a power control circuit according to an embodiment of the present utility model;

FIG. 4 is a schematic diagram of a power control circuit according to an embodiment of the present utility model;

FIG. 5 is a schematic diagram of a voltage waveform provided by an embodiment of the present utility model;

fig. 6 is a schematic diagram of a power control circuit according to an embodiment of the present utility model.

Reference numerals:

a power supply control circuit 100, a first switch 110, a detection circuit 120, a charge-discharge circuit 130, a driving circuit 140, a second switch 150, a sampling circuit 160, a third switch 170, and a fourth switch 180;

a power consumption circuit 200, a first power supply circuit 300, a second power supply circuit 400;

the power supply comprises first to third capacitors C1 to C3, first to sixth resistors R1 to R2, first to second power supply terminals VCC1 to VCC2, first to third diodes D1 to D3, first to second power switching tubes Q1 to Q2, first to second electrolytic capacitors EC1 to EC2, an inductor L, an optocoupler OC, a power supply chip U, a fire wire ACL, a zero line CAN and a discharge resistor RE.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

Referring to fig. 1, one embodiment of the present utility model provides a power control circuit 100. In the present embodiment, the power control circuit 100 is disposed between an input terminal of the power consumption circuit 200 and an output terminal of the first power circuit 300, and the input terminal of the first power circuit 300 is electrically connected to the output terminal of the second power circuit 400; the power control circuit 100 includes a first switch 110 and a detection circuit 120; the first switch 110 is disposed between an input end of the power consumption circuit 200 and an output end of the first power supply circuit 300, the first power supply circuit 300 is configured to provide a first power supply, and the second power supply circuit 400 is configured to provide a second power supply; the detection circuit 120 is electrically connected to the first switch 110, and is configured to detect an input state of the second power circuit 400, and control the first switch 110 to be turned on or off according to the input state.

It will be appreciated that there are many levels of power conversion in a typical appliance to power devices having different supply voltage requirements in the appliance. The first power supply circuit 300 in this embodiment is a circuit next to the second power supply circuit 400, and the first power supply circuit 300 obtains the first power supply by converting the second power supply. The voltage of the first power supply may be equal to or less than that of the second power supply, for example, the first power supply may be 5V, and the second power supply may be 24V.

In some embodiments, the power circuit 200 may be a master circuit of the electrical appliance, the master circuit including an MCU or the like, and the second power source may be used to power the MCU. The first power circuit 300 may be a DCDC circuit, and has a step-down function, in which both input and output are dc. The second power circuit 400 may be a flyback switching power supply, which has a rectifying and filtering function. Of course, the power consumption circuit 200, the first power supply circuit 300 and the second power supply circuit 400 may be other types of circuits, and related structures and principles thereof are well-known and are not described herein.

In the present embodiment, the input states of the second power supply circuit 400 include power up and power down. Wherein, power-up means that there is a power input at the input end of the second power circuit 400, and power-down means that there is no power input at the input end of the second power circuit 400. The second power supply circuit 400 is powered up rather than the electric appliance, and the power failure of the second power supply circuit 400 is equivalent to the power failure of the electric appliance, which can be caused by the fact that the user pulls out the power line of the electric appliance.

In some embodiments, the input of the second power circuit 400 is connected to the power line of the appliance, so the input state of the second power circuit 400 can be detected by detecting whether a current is present on the input or the power line of the second power circuit 400.

In other embodiments, the input terminal of the second power supply circuit 400 is connected to the output terminal of the previous stage power supply circuit, so that the input state of the second power supply circuit 400 can be detected by detecting whether the previous stage power supply circuit inputs or outputs power.

It should be noted that, the detection circuit 120 may control the first switch 110 to be turned on when the input state is powered on, so as to ensure the normal power supply of the power utilization circuit 200. Since the first switch 110 is turned off when power is turned off, even if the first power supply circuit 300 continues to output the first power supply, the power utilization circuit 200 cannot be connected to the first power supply, so that the power utilization circuit 200 is timely powered off. In addition, the detection circuit 120 may control the first switch 110 to be turned off when the input state is power down, so as to cut off the power supply of the power consumption circuit 200.

According to the power supply control circuit 100 of the present utility model, the first switch 110 is provided to control the power supply of the first power supply circuit 300 to the power supply circuit 200 of the subsequent stage, and the detection circuit 120 is provided to control the on/off of the first switch 110, and after the power supply line of the electric appliance is disconnected, the power supply input of the power supply circuit 200 is cut off by disconnecting the first switch 110, so that the power supply circuit 200 is prevented from being in a sub-operation state.

Referring to fig. 2, in some embodiments, the detection circuit 120 includes a first capacitor C1, a charge-discharge circuit 130, and a drive circuit 140; the charge-discharge circuit 130 is electrically connected to the first capacitor C1, and is configured to detect an input state of the second power supply circuit 200, charge the first capacitor C1 when the input state is power-up, and discharge the first capacitor C1 when the input state is power-down; the driving circuit 140 is electrically connected to the first capacitor C1 and the first switch 110, and is configured to control the first switch 110 to be turned on when the voltage of the first capacitor C1 reaches the target voltage.

The driving circuit 140 controls the first switch 110 to be turned on or off according to the voltage across the first capacitor C1. When the voltage of the first capacitor C1 is greater than or equal to the target voltage, the driving circuit 140 sends a first signal to the first switch 110, where the first signal is used to drive the first switch 100 to be turned on; when the voltage of the first capacitor C1 is smaller than the euro target voltage, the driving circuit 140 transmits a second signal to the first switch 110, and the second signal is used to drive the first switch 100 to be turned off. The first signal may be high, and the second signal may be low, or vice versa.

The detection circuit 120 operates as follows: after the electric appliance is powered on, the first capacitor C1 starts to charge, and when the voltage of the first capacitor C1 reaches the target voltage, the first switch 110 is turned on, and the power circuit 200 is connected to the first power supply provided by the first power circuit 300. If the electrical appliance is powered down, the first capacitor C1 starts to discharge, and when the voltage of the first capacitor C1 is smaller than the target voltage, the first switch 110 is turned off, and the power circuit 200 cannot be connected to the first power supply provided by the first power circuit 300.

In some embodiments, the target voltage may be close to the voltage after the first capacitor C1 is full. If the first capacitor C1 is 5V after being full, the target voltage may be 4.5V. Since the first capacitor C1 is switched between charging and amplifying, a target voltage less than the full voltage ensures that the output of the driving circuit 140 is not changed even if slightly discharged after the first capacitor C1 is full.

Referring to fig. 3, in some embodiments, the charge-discharge circuit 130 includes a second switch 150, a first resistor R1, a second resistor R2, and a sampling circuit 160, a first terminal of the second switch 150 is electrically connected to the first power supply terminal VCC 1; a first end of the first resistor R1 is electrically connected to a second end of the second switch 150, and a second end of the first resistor R1 is electrically connected to a first end of the first capacitor C1; the first end of the second resistor R2 is electrically connected with the second end of the first capacitor C1, the second end of the second resistor R2 is electrically connected with the second end of the first capacitor C1, and the second end of the second resistor R2 is grounded; the sampling circuit 160 is electrically connected to a power line and configured to control the second switch 150 to be turned on by a power transmitted through the power line, and the power line is electrically connected to an input terminal of the second power circuit 400.

It is understood that the power cord may be an electrical cord with a plug of the electrical appliance, and the power cord may be connected to a power supply for the electrical appliance after the power cord is plugged into a power socket. The power line indicates that the input state of the second power circuit 200 is powered up when the power line is connected to the power source, and indicates that the input state of the second power circuit 200 is powered down when the power line is not connected to the power source.

In some embodiments, the sampling circuit 160 may convert the power on the power line into a sampling signal that is used to control the second switch 150 to be turned on or off. The sampling signal may be high, if there is a power supply on the power line, for controlling the second switch 150 to be turned on; in the absence of power on the power line, the sample signal may be low, which is used to control the second switch 150 to end up.

It can be appreciated that when the second switch 150 is turned on, the first power terminal VCC1 charges the first capacitor C1 through the first resistor R1, and the first capacitor C1 discharges through the second resistor R2. The charging speed can be made greater than the discharging speed by setting the resistance values of the first resistor R1 and the second resistor R2. When the second switch 150 is turned off, the first capacitor C1 is discharged through the second resistor R2.

In some embodiments, the first power supply terminal VCC1 may be connected to an output terminal of the first power supply circuit 300 to be connected to the first power supply. Alternatively, the first power supply terminal VCC1 may be connected to an input terminal of the first power supply circuit 300 or an output terminal of the second power supply circuit 400 to be connected to the second power supply. Of course, the first power source terminal VCC1 may also be supplied in other manners.

Referring to fig. 4, in some embodiments, the power line includes a live line ACL and a neutral line ACN, the sampling circuit 160 includes a first diode D1, a second diode D2, a third resistor R3, and a fourth resistor R4, the anode of the first diode D1 is electrically connected to the live line ACL, and the cathode of the first diode D1 is electrically connected to the second switch 150; the cathode of the second diode D2 is electrically connected with the cathode of the first diode D1; the first end of the third resistor R3 is electrically connected with the anode of the second diode D2; the first end of the fourth resistor R4 is electrically connected to the second end of the third resistor R3, and the second end of the fourth resistor R4 is electrically connected to the zero line ACN.

It can be appreciated that, since the power source of most electric appliances is ac, in order to facilitate direct detection of the power line, a rectifying circuit is formed by using the first diode D1 and the second diode D2 to sample the ac signal, and the rectified signal is used to drive the second switch 150.

In some embodiments, the second switch 150 is an optocoupler OC, the positive electrode of the light emitting tube of the optocoupler OC is electrically connected to the negative electrode of the first diode D1, the negative electrode of the light emitting tube of the optocoupler OC is electrically connected to the positive electrode of the second diode D2, the positive electrode of the receiving tube of the optocoupler OC is electrically connected to the first power supply terminal VCC1, and the negative electrode of the receiving tube of the optocoupler OC is electrically connected to the first end of the first resistor R1.

It can be appreciated that, since the voltage on the power line is higher, and the voltages of the power circuit 200 and the first power circuit 300 are lower, the optocoupler OC can perform an isolation function, so as to realize control between the high voltage and the low voltage.

Referring to fig. 5, a waveform A1 represents a voltage waveform of a negative electrode of the first diode D1, a waveform A2 represents a voltage waveform of a negative electrode of a receiving tube of the optocoupler OC, and a waveform A3 represents a voltage waveform of a first end of the first capacitor C1. In the positive half cycle of the alternating current signal, the negative electrode of the first diode D1 is high voltage, the optocoupler OC is conducted, and the first power end VCC1 charges the first capacitor C1 through the first resistor R1; at the negative half cycle of the ac signal, the optocoupler OC is disconnected and the first capacitor C1 is discharged. By configuring the charge/discharge rate of the first capacitor C1, the charge rate can be made larger than the discharge rate in one cycle of the ac signal. After a plurality of cycles, the voltage of the first capacitor C1 may reach the target voltage.

In some embodiments, the charge-discharge circuit 130 further includes a fifth resistor R5, a first end of the fifth resistor R5 is electrically connected to the first end of the first resistor R1, and a second end of the fifth resistor R5 is grounded.

The fifth resistor R5 plays a role in pull-down, and after the power line is powered down, the negative electrode of the receiving tube of the optocoupler OC is always at a low level, so that the first capacitor C1 discharges.

In some embodiments, the charge-discharge circuit 130 further includes a third diode D3, an anode of the third diode D3 is electrically connected to a cathode of the receiving tube of the optocoupler OC, and a cathode of the third diode D3 is electrically connected to the first end of the first resistor R1.

The anode of the third diode D3 is also electrically connected to the first end of the fifth resistor R5. When the first capacitor C1 discharges, due to the blocking effect of the third diode D3, the first capacitor C1 can only discharge through the second resistor, so that the first capacitor is prevented from simultaneously discharging the fifth resistor R5, which results in too high discharge speed and incapability of charging.

With continued reference to fig. 4, in some embodiments, the driving circuit 140 includes a sixth resistor R6 and a third switch 170, the first terminal of the sixth resistor R6 is electrically connected to the second power supply terminal VCC2, the second terminal of the sixth resistor R6 is electrically connected to the control terminal of the first switch 110, and the first switch 110 is configured to be turned on when the control terminal is low and turned off when the control terminal is high; the first terminal of the third switch 170 is electrically connected to the second terminal of the sixth resistor R6, the second terminal of the third switch 170 is grounded, the control terminal of the third switch 170 is electrically connected to the first terminal of the first capacitor C1, and the third switch 170 is configured to be turned on when the control terminal is at a high level and turned off when the control terminal is at a low level.

In this embodiment, the first switch 110 may include a first power switching transistor Q1, and the third switch 170 may include a second power switching transistor Q2. The first power switch Q1 may be a P-type MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor, metal-Oxide semiconductor field effect transistor), and the second power switch Q2 may be an N-type MOSFET. Of course, the first switch 110 and the third switch 170 may also be other types of switching elements, such as a transistor or an IGBT (Insulated Gate Bipolar Transistor ), and the like.

In the present embodiment, the second power supply terminal VCC2 may be electrically connected to an input terminal or an output terminal of the first power supply circuit 300. Since the voltage at the input or output of the first power circuit 300 will remain for a while when the electric appliance is powered down, the voltage at the input or output of the first power circuit 300 can be used to provide a high level for the first switch 110 to turn off the first switch 110.

It can be understood that when the electric appliance is powered on, the first capacitor C1 is charged to the target voltage, the third switch 170 is turned on, the first switch 110 is turned on, and the power circuit 200 is connected to the first power supply; when the electric appliance is powered down, the first capacitor C1 is discharged below the target voltage, the third switch 170 is turned off, the first switch 110 is turned off, and the power circuit 200 stops accessing the first power supply.

With continued reference to fig. 4, as an example, the first power supply circuit 300 may include a power supply chip U, a second capacitor C2, a third capacitor C3, a first electrolytic capacitor EC1, a second electrolytic capacitor EC2, and an inductance L. The input pin IN of the power chip U is respectively and electrically connected with the first end of the second capacitor C2 and the first end of the first electrolytic capacitor EC1, the output pin OUT of the power chip U is electrically connected with the first end of the inductor L, the second end of the inductor L is respectively and electrically connected with the first end of the third capacitor C3 and the first end of the second electrolytic capacitor EC2, the second end of the second capacitor C2, the second end of the first electrolytic capacitor EC1, the second end of the third capacitor C3 and the second end of the second electrolytic capacitor EC2 are grounded.

The input pin IN of the power chip U serves as an input terminal of the first power circuit 300, and the input pin IN is connected to a second power source of 24V. The power supply chip U obtains a first power supply of 5V for the second power supply, and the second end of the inductor L serves as an output end of the first power supply circuit 300 to supply the power of 5V to the subsequent stage. The power chip U has already established technology, and this embodiment is not described here in detail.

It will be appreciated that due to the presence of the second capacitor C2, the third capacitor C3, the first electrolytic capacitor EC1 and the second electrolytic capacitor EC2, the power supply of 24V and 5V will remain for a while after the electrical appliance is powered down. The drain of the first power switching tube Q1 is electrically connected to the power consumption circuit 200 at the subsequent stage, and at this time, the source of the first power switching tube Q1 is kept at 5V by turning off the first power switching tube Q1, but the drain of the first power switching tube Q1 is at a low voltage, and the power consumption circuit 200 has no power input and stops working.

Referring to fig. 6, an embodiment of the present utility model further provides a power control circuit 100, wherein an input terminal of the first power circuit 300 is electrically connected to an output terminal of the second power circuit 400, an output terminal of the first power circuit 300 is electrically connected to an input terminal of the power utilization circuit 200, the first power circuit 300 is configured to provide a first power supply, the second power circuit 400 is configured to provide a second power supply, and a discharge resistor RE is connected to an input terminal and/or an output terminal of the first power circuit 200; the power control circuit 100 includes a fourth switch 180 and a detection circuit 120, a first end of the fourth switch 180 is electrically connected to a first end of the discharge resistor RE, and a second end of the fourth switch 180 is grounded; the detection circuit 120 is electrically connected to the fourth switch 180, and is configured to detect an input state of the second power supply circuit 400, and control the fourth switch 180 to be turned on when the input state is power-down.

In this embodiment, the detection circuit 120 may have the same configuration as in the above-described embodiments. Since the fourth switch 180 is opposite to the turn-off logic of the first switch 110, the detection circuit 120 in the above embodiments may be adapted by setting the fourth switch 180 type, for example, the fourth switch 180 may be an N-type MOSFET. The detection circuit 120, the power consumption circuit 200, the first power supply circuit 300 and the second power supply circuit 400 may be described in detail with reference to the foregoing descriptions, and the description of this embodiment is omitted herein.

It will be appreciated that when the fourth switch 180 is turned on, the first terminal of the discharge resistor RE is grounded, and the input terminal and/or the output terminal of the first power circuit 200 may be rapidly discharged through the discharge resistor RE. After the discharge is completed, the power circuit 200 has no power input.

The smaller the resistance value of the discharge resistor RE, the faster the discharge speed. To reduce power consumption when the appliance is powered up, the detection circuit 120 may be turned off by the fourth switch 180, and the discharge resistor RE does not operate.

According to the power control circuit 100 of the present utility model, the fourth switch 180 is provided to control the discharge of the input side or the output side of the first power circuit 300, and the detection circuit 120 is provided to control the on/off of the fourth switch 180, and after the power line of the electric appliance is disconnected, the fourth switch 180 is turned on to discharge the input side or the output side of the first power circuit 300, so that the power supplied to the power circuit 200 is rapidly consumed, and the power circuit 200 is prevented from being in a sub-operation state.

An embodiment of the present utility model also provides a household appliance comprising the power control circuit 100 according to any one of the above embodiments.

In some embodiments, the household appliance may be a fryer, oven, or the like. The household appliance further includes the power consumption circuit 200, the first power supply circuit 300 and the second power supply circuit 400, and the specific structures and principles of the power supply control circuit 100, the power consumption circuit 200, the first power supply circuit 300 and the second power supply circuit 400 may refer to the above embodiments, and this embodiment is not repeated herein.

According to the household appliance disclosed by the utility model, after the power supply is pulled out, the power supply circuit can rapidly stop supplying power to the rear-stage circuit, so that abnormal operation of equipment is avoided, and the user experience is improved.

The terms first, second and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged, as appropriate, such that embodiments of the present utility model may be implemented in sequences other than those illustrated or described herein, and that the objects identified by "first," "second," etc. are generally of a type, and are not limited to the number of objects, such as the first object may be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (11)

1. A power supply control circuit, comprising:

the first switch is arranged between the input end of the power utilization circuit and the output end of the first power supply circuit, the input end of the first power supply circuit is electrically connected with the output end of the second power supply circuit, the first power supply circuit is configured to provide a first power supply, and the second power supply circuit is configured to provide a second power supply;

the detection circuit is electrically connected with the first switch and is configured to detect the input state of the second power supply circuit and control the on-off of the first switch according to the input state;

the detection circuit includes:

a first capacitor;

the charging and discharging circuit is electrically connected with the first capacitor and is configured to detect the input state of the second power supply circuit, charge the first capacitor when the input state is power-on, and discharge the first capacitor when the input state is power-off;

and the driving circuit is electrically connected with the first capacitor and the first switch respectively and is configured to control the first switch to be turned on when the voltage of the first capacitor reaches a target voltage.

2. The power supply control circuit according to claim 1, wherein the charge-discharge circuit includes:

the first end of the second switch is electrically connected with the first power supply end;

a first resistor, wherein a first end of the first resistor is electrically connected with a second end of the second switch, and a second end of the first resistor is electrically connected with a first end of the first capacitor;

and the sampling circuit is electrically connected with the power line and is configured to control the second switch to be turned on by utilizing a power transmitted by the power line, and the power line is electrically connected with the input end of the second power circuit.

3. The power supply control circuit of claim 2, wherein the charge-discharge circuit further comprises:

the first end of the second resistor is electrically connected with the second end of the first capacitor, the second end of the second resistor is electrically connected with the second end of the first capacitor, and the second end of the second resistor is grounded.

4. The power control circuit of claim 2 wherein the power cord comprises a hot wire and a neutral wire, the sampling circuit comprising:

the anode of the first diode is electrically connected with the live wire, and the cathode of the first diode is electrically connected with the second switch;

a second diode, the cathode of which is electrically connected with the cathode of the first diode;

and the first end of the third resistor is electrically connected with the anode of the second diode, and the second end of the third resistor is electrically connected with the zero line.

5. The power control circuit of claim 4, wherein the second switch is an optocoupler, a positive electrode of a light emitting tube of the optocoupler is electrically connected with a negative electrode of the first diode, a negative electrode of the light emitting tube of the optocoupler is electrically connected with a positive electrode of the second diode, a positive electrode of a receiving tube of the optocoupler is electrically connected with the first power supply terminal, and a negative electrode of the receiving tube of the optocoupler is electrically connected with the first terminal of the first resistor.

6. The power control circuit of claim 5, wherein the charge-discharge circuit further comprises a fifth resistor, a first end of the fifth resistor being electrically connected to the first end of the first resistor, a second end of the fifth resistor being grounded.

7. The power control circuit of claim 6, wherein the charge-discharge circuit further comprises a third diode, an anode of the third diode being electrically connected to a negative electrode of the receiving tube of the optocoupler, a negative electrode of the third diode being electrically connected to the first end of the first resistor.

8. The power supply control circuit according to any one of claims 2 to 7, wherein the drive circuit includes:

a sixth resistor, a first end of which is electrically connected to the second power supply end, a second end of which is electrically connected to the control end of the first switch, the first switch being configured to be turned on when the control end is at a low level and turned off when the control end is at a high level;

the first end of the third switch is electrically connected with the second end of the sixth resistor, the second end of the third switch is grounded, the control end of the third switch is electrically connected with the first end of the first capacitor, and the third switch is configured to be turned on when the control end is at a high level and turned off when the control end is at a low level.

9. The power control circuit of claim 8 wherein the first switch is a P-type MOSFET and the second switch is an N-type MOSFET.

10. The power supply control circuit is characterized in that an input end of a first power supply circuit is electrically connected with an output end of a second power supply circuit, the output end of the first power supply circuit is electrically connected with an input end of an electric circuit, the first power supply circuit is configured to provide a first power supply, the second power supply circuit is configured to provide a second power supply, and the input end and/or the output end of the first power supply circuit is connected with a discharge resistor; the power supply control circuit includes:

a fourth switch, a first end of which is electrically connected with the first end of the discharge resistor, and a second end of which is grounded;

the detection circuit is connected with the fourth switch and is configured to detect the input state of the second power supply circuit and control the fourth switch to be turned on when the input state is power failure;

the detection circuit includes:

a first capacitor;

the charging and discharging circuit is electrically connected with the first capacitor and is configured to detect the input state of the second power supply circuit, charge the first capacitor when the input state is power-on, and discharge the first capacitor when the input state is power-off;

and the driving circuit is respectively connected with the first capacitor and the fourth switch and is configured to control the fourth switch to be turned on when the voltage of the first capacitor is lower than the target voltage.

11. A household appliance, characterized by comprising the power supply control circuit according to any one of claims 1-10.