CN103677034B - The stand-by circuit of household electrical appliance and standby controlling method - Google Patents
The stand-by circuit of household electrical appliance and standby controlling method Download PDFInfo
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- CN103677034B CN103677034B CN201210322032.4A CN201210322032A CN103677034B CN 103677034 B CN103677034 B CN 103677034B CN 201210322032 A CN201210322032 A CN 201210322032A CN 103677034 B CN103677034 B CN 103677034B
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Abstract
The invention discloses a kind of stand-by circuit and standby controlling method of household electrical appliance, the stand-by circuit of these household electrical appliance comprises: 5V power cutting circuit, is arranged between 5V load and 5V power supply; And main control chip, being connected with 5V power cutting circuit, cutting off the power supply of 5V load for the control 5V power cutting circuit when receiving off signal or standby signal.By the present invention, between 5V power supply and 5V load, be provided with 5V power cutting circuit, thus make 5V power supply when standby be only the devices such as main control chip to power, and do not give other 5V load supplyings, and then reach energy-conservation effect.
Description
Technical field
The present invention relates to field of household appliances, in particular to a kind of stand-by circuit and standby controlling method of household electrical appliance.
Background technology
In prior art, the stand-by power consumption of household electrical appliance is higher.According to the social investigation display of family's standby energy consumption that Regius professor completes, family's standby energy consumption level on average takies 8% of power consumption total amount.Therefore, reduce the stand-by power consumption of household electronic products, concerning energy saving, have very important significance, huge economic benefit will be brought to society.At present, the design proposal of the design proposal of low-power consumption standby as shown in Figure 1 that usually adopts of household electrical appliance or low-power consumption standby as shown in Figure 2.As shown in Figure 1, in this stand-by circuit, only comprise a road out-put supply, the feedback circuit of Switching Power Supply adopts TL431 to control, and can realize voltage accurately and export control.In this circuit, the power supply (+12V) of 12V load is exported by Switching Power Supply secondary and provides, and the power supply (+5V) of the 5V loads such as main control chip, remote-control receiving circuit, key press detecting circuit is provided through 7805 conversion decompressions by 12V.When main control chip receives off signal or the standby signal of remote control circuit, or button off signal or standby signal time, main control chip enters holding state, at this moment, 12V load quits work, but 5V load also in working order, stand-by power consumption can be caused higher, generally can only accomplish that 1W is standby.The difference of circuit shown in Fig. 2 and Fig. 1 is that the feedback circuit that TL431 is formed is changed to the feedback circuit be made up of stabilivolt, and the circuit shown in other principle with Fig. 1 is identical.By the circuit shown in Fig. 1 and Fig. 2, the power consumption of household electrical appliance can be reduced to a certain extent, but the effect of the reduction power consumption that these two kinds of circuit can play is also very limited.
For the problem that household electrical appliance stand-by power consumption in prior art is higher, at present effective solution is not yet proposed.
Summary of the invention
The invention provides a kind of stand-by circuit and standby controlling method of household electrical appliance, at least to solve the problem that in prior art, household electrical appliance stand-by power consumption is higher.
To achieve these goals, according to an aspect of the present invention, a kind of stand-by circuit of household electrical appliance is provided.
Stand-by circuit according to household electrical appliance of the present invention comprises: 5V power cutting circuit, is arranged between 5V load and 5V power supply; And main control chip, being connected with 5V power cutting circuit, cutting off the power supply of 5V load for the control 5V power cutting circuit when receiving off signal or standby signal.
Further, 5V power cutting circuit comprises: the first switch, and Enable Pin is connected with main control chip, and input end is connected with 5V power supply, and output terminal is connected with 5V load.
Further, first switch is the electronic switch with low conducting internal resistance and low conduction voltage drop, wherein, the first input end of electronic switch is connected with 5V power supply respectively with the second input end, first earth terminal of input end side and the second earth terminal of output terminal side are connected to ground respectively, first electric capacity is connected between input end and ground, and the second electric capacity is connected between output terminal and ground.
Further, stand-by circuit also comprises: output circuit, for providing output voltage; And DC turns DC circuit, is arranged between output circuit and main control chip.
Further, DC turns DC circuit and comprises: SN1106046D chip, and VIN end is connected with output circuit, and LX end is connected with main control chip by inductance; First electric capacity, first end is connected to the BOOT end of SN1106046D chip, and the second end is connected to the LX end of SN1106046D chip; Second electric capacity, first end is connected to the ROSC end of SN1106046D chip and ROSC end to be held with GND and is connected, and the SS that the second end is connected to SN1106046D chip holds; Diode, positive pole is connected to the GND end of SN1106046D chip, and negative pole is connected to the LX end of SN1106046D chip; Resistance, first end is connected to the COMP end of SN1106046D chip; 3rd electric capacity, first end is connected to the second end of resistance, and the second end is connected to the GND end of SN1106046D chip; Inductance, first end is connected to the LX end of SN1106046D chip, and the second end is connected to the VSENSE end of SN1106046D chip; And the 4th electric capacity, the 5th electric capacity and the 6th electric capacity three Capacitance parallel connections, the first end of the 4th electric capacity is connected to the second end of inductance, and the second end is connected to the first end of the second electric capacity.
Further, stand-by circuit also comprises: output circuit, for providing output voltage; Controlled feedback circuit, is connected with output circuit, for regulation output voltage; Readiness control circuit, is connected with controlled feedback circuit and main control chip respectively; And main control chip is also for when receiving off signal or standby signal, control readiness control circuit by controlled feedback circuit conditioning output voltage.
Further, readiness control circuit comprises: the first resistance, and when the first resistor coupled in parallel is between the voltage input end and reference source of controlled feedback circuit, controlled feedback circuit turns down output voltage; And second switch, for connecting or disconnect the parallel branch at the first resistance place.
Further, second switch comprises PNP triode, one NPN triode and the 2nd NPN triode, wherein, the emitter of PNP triode is connected with the voltage input end of controlled feedback circuit, the collector of PNP triode is connected with the first resistance, the collector of the one NPN triode is connected with the base stage of PNP triode, the emitter of the one NPN triode is connected to ground, the base stage of the one NPN triode is connected with 5V power supply, the collector of the 2nd NPN triode is connected with 5V power supply, the emitter of the 2nd NPN triode is connected to ground, the base stage of the 2nd NPN triode is connected with main control chip.
Further, second switch also comprises: the second resistance, is connected between the base stage of PNP triode and the collector of a NPN triode; 3rd resistance, between the base stage being connected to a NPN triode and 5V power supply; 4th resistance, first end is connected to 5V power supply, and the second end is connected between the collector of the 3rd resistance and the 2nd NPN triode; And the 5th resistance, between the base stage being connected to the 2nd NPN triode and main control chip.
To achieve these goals, according to another aspect of the present invention, a kind of standby controlling method of household electrical appliance is provided.The method can realize based on the readiness control circuit of household electrical appliance provided by the invention.
Idle method according to household electrical appliance of the present invention comprises: receive off signal or standby signal; And control 5V power cutting circuit cuts off the power supply of 5V load, wherein, 5V power cutting circuit is arranged between 5V load and 5V power supply.
Further, the power supply that control 5V power cutting circuit cuts off 5V load comprises: the connection between the input and output cutting off electronic switch U1 in 5V power cutting circuit.
Further, after reception off signal or standby signal, said method also comprises: the partial pressure value increasing reference source in controlled feedback circuit; Determine the difference of the partial pressure value of reference source and the reference value of reference source; And difference is fed back to output circuit to reduce the input voltage that DC turns DC circuit.
The device such as main control chip due to household electrical appliance adopts 5V power supply to power, therefore 5V power supply is in conducting state always, therefore there is power consumption in 5V load always, the present invention is provided with 5V power cutting circuit between 5V power supply and 5V load, thus make 5V power supply when standby be only main control chip, remote-control receiving circuit, key press detecting circuit and readiness control circuit these when standby, need the 5V load supplying of work, and do not give telecommunication circuit, memory chip, I/O switches the 5V load supplying that chip and pilot lamp driving chip etc. do not need work when standby, therefore the problem that in technology, household electrical appliance stand-by power consumption is higher is solved, and then reach energy-conservation effect.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the circuit diagram of the stand-by circuit of a kind of household electrical appliance of the prior art;
Fig. 2 is the circuit diagram of the stand-by circuit of another kind of household electrical appliance of the prior art;
Fig. 3 is the structured flowchart of the stand-by circuit of household electrical appliance according to the embodiment of the present invention;
Fig. 4 is the structured flowchart of the stand-by circuit of household electrical appliance according to the preferred embodiment of the invention;
Fig. 5 is the circuit diagram of the stand-by circuit of household electrical appliance according to first preferred embodiment of the invention;
Fig. 6 is the circuit diagram of the stand-by circuit of household electrical appliance according to second preferred embodiment of the invention; And
Fig. 7 is the process flow diagram of the standby controlling method of household electrical appliance according to the embodiment of the present invention.
Embodiment
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
Embodiments provide a kind of stand-by circuit of household electrical appliance, below the stand-by circuit of the household electrical appliance that the embodiment of the present invention provides is introduced.
Fig. 3 is the structured flowchart of the stand-by circuit of household electrical appliance according to the embodiment of the present invention.
As shown in Figure 3, the stand-by circuit of these household electrical appliance comprises 5V power cutting circuit 206 and main control chip 205.
5V power cutting circuit 206 is arranged between 5V load and 5V power supply.
Main control chip 205 is connected with 5V power cutting circuit 206, cuts off the power supply of 5V load for the control 5V power cutting circuit 206 when receiving off signal or standby signal.
In the present embodiment, 5V power cutting circuit 206 is provided with between 5V power supply and 5V load, thus make 5V power supply when standby be only the devices such as main control chip to power, and do not give other 5V load supplyings, therefore solve the problem that in prior art, household electrical appliance stand-by power consumption is higher, and then reach energy-conservation effect.
Particularly, 5V power cutting circuit 206 comprises the first switch, and the Enable Pin of the first switch is connected with main control chip, and input end is connected with 5V power supply, and output terminal is connected with 5V load.By the first switch, the conducting between 5V load and power supply and disconnection can be realized easily.
Further, the first switch in the present embodiment can for having the electronic switch of low conducting internal resistance and low conduction voltage drop, be U1, this electronic switch has the feature of low conducting internal resistance and low conduction voltage drop, U1 can be TPS22969 electronic switch, wherein, the first input end of TPS22969 electronic switch is connected with 5V power supply respectively with the second input end, first earth terminal of input end side and the second earth terminal of output terminal side are connected to ground respectively, first electric capacity C5 is connected between input end and ground, and the second electric capacity C7 is connected between output terminal and ground.
Stand-by circuit in the present embodiment also comprises output circuit and DC turns DC circuit, and output circuit is used for providing output voltage, and output circuit comprises Switching Power Supply primary part 100 and secondary output circuit 200 two parts.DC turns DC circuit 201 and is arranged between output circuit and main control chip 205, particularly, can be arranged between secondary output circuit 200 and main control chip 205.
The efficiency of DC is turned in order to improve DC, preferably, DC turns DC circuit and comprises SN1106046D chip, and the concrete annexation of this circuit is: the VIN end of SN1106046D chip is connected with output circuit as input end, and LX end is connected with main control chip by inductance L 1 as output terminal.VSENSE end, as feedback end, is held for making LX and can accurately be exported 5V voltage by inductance L 1; The first end of the first electric capacity C9 is connected to the BOOT end of SN1106046D chip, and the second end is connected to the LX end of SN1106046D chip; The first end of the second electric capacity C12 is connected to the ROSC end of SN1106046D chip and ROSC end is held with GND and is connected, and the SS that the second end is connected to SN1106046D chip holds; The positive pole of diode D1 is connected to the GND end of SN1106046D chip, and negative pole is connected to the LX end of SN1106046D chip; The first end of resistance R21 is connected to the COMP end of SN1106046D chip; The first end of the 3rd electric capacity C14 is connected to second end of resistance R21, and the second end is connected to the GND end of SN1106046D chip; The first end of inductance L 1 is connected to the LX end of SN1106046D chip, and the second end is connected to the VSENSE end of SN1106046D chip; 4th electric capacity, the 5th electric capacity and the 6th electric capacity three Capacitance parallel connections, the first end of the 4th electric capacity C1 is connected to the second end of inductance, and the second end is connected to the first end of the second electric capacity C12.SN1106046D chip is the chip of a high conversion efficiency, and the conversion efficiency of its when underloading (time standby) is more than 80%, and during underloading, its input voltage reliably can also export 5V when 5.3V ~ 6.5V.
In order to make the satisfactory voltage of output voltage, preferably, stand-by circuit, except comprising output circuit, also comprises controlled feedback circuit 209 and readiness control circuit 208.Output circuit is used for providing output voltage.Controlled feedback circuit 209 is connected with output circuit, for regulation output voltage.Readiness control circuit 208 is connected with controlled feedback circuit 209 and main control chip 205 respectively.Main control chip 205, also for when receiving off signal or standby signal, controls readiness control circuit 208 by controlled feedback circuit 209 regulation output voltage.
Particularly, readiness control circuit comprises the first resistance and second switch, and when the first resistor coupled in parallel is between the voltage input end and reference source of controlled feedback circuit 209, controlled feedback circuit 209 turns down output voltage, in the present embodiment, the first resistance can be connected by R106 and R107 and be realized.Second switch is for connecting or disconnect the parallel branch at the first resistance place.
Further, second switch comprises PNP triode Q6, one NPN triode Q5 and the 2nd NPN triode Q7, wherein, the emitter of PNP triode Q6 is connected with the voltage input end of controlled feedback circuit, the collector of PNP triode Q6 is connected with the first resistance, the collector of the one NPN triode Q5 is connected with the base stage of PNP triode Q6, the emitter of the one NPN triode Q5 is connected to ground, the base stage of the one NPN triode Q5 is connected with 5V power supply, the collector of the 2nd NPN triode Q7 is connected with 5V power supply, the emitter of the 2nd NPN triode Q7 is connected to ground, the base stage of the 2nd NPN triode Q7 is connected with main control chip.
Further, second switch also comprises the second resistance, the 3rd resistance, the 4th resistance and the 5th resistance, and in the present embodiment, the second resistance R108 is connected between the base stage of PNP triode and the collector of a NPN triode Q5; Between the base stage that 3rd resistance R111 is connected to a NPN triode Q5 and 5V power supply; The first end of the 4th resistance R109 is connected to 5V power supply, and the second end is connected between the collector of the 3rd resistance R111 and the 2nd NPN triode Q7; Between the base stage that 5th resistance R110 is connected to the 2nd NPN triode Q7 and main control chip 205.
Fig. 4 is the structured flowchart of the stand-by circuit of household electrical appliance according to the preferred embodiment of the invention.This embodiment can as preferred implementation embodiment illustrated in fig. 3.
As shown in Figure 4, the stand-by circuit of these household electrical appliance comprises Switching Power Supply primary part 100, secondary output circuit 200, DC turn DC circuit 201,12V load 202, remote-control receiving circuit 203, key press detecting circuit 204, main control chip 205,5V cut off circuit 206,5V load circuit 207, readiness control circuit 208 and controlled feedback circuit 209.
As can be seen from Figure 4, electric current flows to secondary output circuit 200 from Switching Power Supply primary part 100, flow out with the direct current of 12V, a direct current part of 12V is 12V load supplying, a part flows into controlled feedback circuit 209 and forms backfeed loop, another part turns DC circuit 201 through DC and changes into 5V direct current, part 5V direct current is remote-control receiving circuit 203, key press detecting circuit 204 and main control chip 205 are powered, part 5V direct current cuts off circuit 206 by 5V and flows into 5V load circuit 207, some flows into readiness control circuit 208, the output voltage of secondary output circuit 200 is regulated by readiness control circuit 208.
Fig. 5 is the circuit diagram of the stand-by circuit of household electrical appliance according to first preferred embodiment of the invention.This embodiment can as preferred implementation embodiment illustrated in fig. 3.
As shown in Figure 5, the stand-by circuit Switching Power Supply primary part 100 of household electrical appliance, secondary output circuit 200, DC turn DC circuit 201,12V load 202, remote-control receiving circuit 203, key press detecting circuit 204, main control chip 205,5V cut off circuit 206,5V load circuit 207, readiness control circuit 208 and controlled feedback circuit 209.
Wherein, Switching Power Supply primary part 100 and secondary output circuit 200, DC turn DC circuit 201, readiness control circuit 208 and controlled feedback circuit 209 and are connected, for above-mentioned several circuit is powered, and can by forming backfeed loop with controlled feedback circuit 209, the output voltage of gauge tap power supply, makes the satisfactory voltage of output voltage.
Main control chip 205 is when normal operating conditions, and Opportunity awaiting control for linear signal exports as high level, and cut off in circuit 206 at 5V, the Enable Pin because of electronic switch U1 obtains high level signal, U1 meeting conducting, and 5V load obtains+5V2 power supply; In readiness control circuit 208, because Opportunity awaiting control for linear signal is high level, NPN triode Q7 conducting, the base stage of NPN triode Q5 is pulled to low level, Q5 ends, correspondingly Q6 also ends and does not work, be equivalent to readiness control circuit 208 not and controlled feedback circuit 209 form path, at this moment, the secondary output circuit 200 of controlled feedback circuit 209 gauge tap power supply exports normal voltage+12V, for 12V load 202, as the power supply such as relay, stepper motor, normal voltage+12V can also provide normal rated voltage source for DC turns DC circuit 201.
Main control chip 205 receives off signal or the standby signal of remote-control receiving circuit 203, or after the off signal of key press detecting circuit 204 or standby signal, enters holding state.Under holding state, main control chip 205 enters sleep pattern, and in a sleep mode, main control chip 205 consumes few energy, generally can reach several microamperes to 30 microamperes ranks, namely only keeps the detection to remote signal, push button signalling.Main control chip 205 (can require to arrange according to different chip) and detect these two signals once in certain time interval, if receive these two kinds of signals or wherein a kind of, main control chip 205 just can wake up.Main control chip 205 is when standby, and the equal output low level of its all I/O, 12V load does not work, and reduces stand-by power consumption.
Cut off in circuit 206 at 5V, Opportunity awaiting control for linear signal is low level, electronic switch U1(has low conducting internal resistance and low conduction voltage drop, the TPS22969 of such as TI, also can be that other have the device of similar functions) Enable Pin voltage be low level, connection between the input and output of cut-out U1, power supply+the 5V2 of 5V load will be cut off, 5V load does not work, in the present embodiment, by remote-control receiving circuit 203, key press detecting circuit 204, the 5V power supply of readiness control circuit 208 and main control chip 205 is considered as+5V1, the power supply of other 5V loads is considered as+5V2, when U1 is in conducting state, + 5V1 and+5V2 approximately equal, when U1 is in off-state ,+5V2 is 0.Therefore, when holding state, in 5V circuit, only have remote-control receiving circuit 203, key press detecting circuit 204, readiness control circuit 208 and main control chip 205 in work, these circuit only consume extremely low power consumption when standby.
Because Opportunity awaiting control for linear signal is low level, in readiness control circuit 208, NPN triode Q7 ends, + 5V1 is by resistance R109, R111 driving N PN triode Q5, triode Q5 conducting, thus make the emitter of PNP triode Q6 and base stage there is pressure reduction, make PNP triode Q6 conducting, resistance R106, resistance R5 in R107 and controlled feedback circuit 209, R8 forms parallel circuit, resistance R106, R107, R5, after R8 parallel connection, resistance value reduces, reference source U7(TL431) voltage that sampled by resistance R4 will be raised, sampled voltage and U7(TL431) reference value 2.5V compare, through U7(TL431) amplification of internal error amplifier, switch chip U10 is fed back to through optocoupler U6, switch chip U10 will automatic adjustment switch pulsed frequency or pulse width, the secondary output voltage of Switching Power Supply is reduced, to make reference source U7(TL431) voltage that sampled by resistance R4 is 2.5V, thus make in the standby state, secondary output voltage+the 12V of Switching Power Supply is dragged down below 12V, specifically be pulled down to how many V, the requirement that can turn DC chip according to DC is arranged, ensure that DC turns DC chip and when standby, reliably exports 5V to remote-control receiving circuit 203, key press detecting circuit 204, readiness control circuit 208 and main control chip 205 provide power supply.Usually, by the resistance of adjusting resistance R106, R107, R5, R8, R4, the secondary output voltage+12V of Switching Power Supply can be pulled down to 5.2V ~ 9V.When so just can be implemented in standby, input voltage DC being turned DC chip reduces, thus is greatly reduced by stand-by power consumption.
DC turns in DC circuit 201, DC-DC chip U3(is such as: the SN1106046D of TI, also can be that other have the device of similar functions) be the chip of a high conversion efficiency, it is when underloading, namely conversion efficiency time standby is more than 80%, and during underloading, its input voltage reliably can also export 5V when 5.3V ~ 6.5V.Like this when standby, the resistance of R106, R107, R5, R8, the R4 in readiness control circuit 208 and controlled feedback circuit 209 can be adjusted, make the input voltage of U3 be reduced to 5.3V ~ 6.5V, reduce stand-by power consumption further.
In Switching Power Supply primary part 100, switch chip U10 enters the mode of operation of hop cycle or frequency jitter, reduces the idling consumption of Switching Power Supply part as far as possible.
Fig. 6 is the circuit diagram of the stand-by circuit of household electrical appliance according to second preferred embodiment of the invention.This embodiment can as preferred implementation embodiment illustrated in fig. 3.
As shown in Figure 6, this preferred embodiment is to eliminate key press detecting circuit 204 with the difference of the first preferred embodiment, thus the detection eliminated push button signalling, for the household electrical appliances of certain model, the air-conditioning of such as certain model, only by remote pilot, therefore, cancel the detection to push button signalling, simplify the structure of the stand-by circuit of household electrical appliance.
The embodiment of the present invention additionally provides a kind of standby controlling method of household electrical appliance, and the stand-by circuit of the household electrical appliance that this control method can provide based on above-described embodiment realizes.
Fig. 7 is the process flow diagram of the standby controlling method of household electrical appliance according to the embodiment of the present invention.As shown in Figure 7, this control method comprises the following steps that S702 is to step S704.
Step S702, receives off signal or standby signal.
Off signal in the present embodiment or standby signal are recorded by remote-control receiving circuit or key press detecting circuit.
Particularly, in this step, the connection between the input and output can cutting off electronic switch U1 in 5V power cutting circuit.
As shown in Figure 5, cut off in circuit 206 at 5V, Opportunity awaiting control for linear signal is low level, electronic switch U1(has low conducting internal resistance and low conduction voltage drop, the TPS22969 of such as TI, also can be that other have the device of similar functions) Enable Pin voltage be low level, connection between the input and output of cut-out U1, power supply+the 5V2 of 5V load will be cut off, 5V load does not work, in the present embodiment, by remote-control receiving circuit 203, key press detecting circuit 204, the 5V power supply of readiness control circuit 208 and main control chip 205 is considered as+5V1, the power supply of other 5V loads is considered as+5V2, when U1 is in conducting state, + 5V1 and+5V2 approximately equal, when U1 is in off-state ,+5V2 is 0.Therefore, when holding state, in 5V circuit, only have remote-control receiving circuit 203, key press detecting circuit 204, readiness control circuit 208 and main control chip 205 in work, these circuit only consume extremely low power consumption when standby.
Step S704, control 5V power cutting circuit cuts off the power supply of 5V load, and wherein, 5V power cutting circuit is arranged between 5V load and 5V power supply.
5V cut-out circuit in the present embodiment can be that the 5V provided in the embodiment corresponding to Fig. 5 to Fig. 6 cuts off circuit.
In order to obtain 5V power supply easily, preferably, before reception off signal or standby signal, said method also comprises: control DC turns DC circuit and 12V voltage transitions become 5V voltage to obtain 5V power supply.
In order to when standby, input voltage DC being turned DC chip reduces, and preferably, turn DC circuit at controls DC and 12V voltage transitions to be become 5V voltage with after obtaining 5V power supply, said method also comprises: the partial pressure value of reference source in increase controlled feedback circuit; Determine the difference of the partial pressure value of reference source and the reference value of reference source; And difference is fed back to output circuit to reduce the input voltage that DC turns DC circuit.
As shown in Figure 5, because Opportunity awaiting control for linear signal is low level, in readiness control circuit 208, NPN triode Q7 ends, + 5V1 is by resistance R109, R111 driving N PN triode Q5, triode Q5 conducting, thus make the emitter of PNP triode Q6 and base stage there is pressure reduction, make PNP triode Q6 conducting, resistance R106, resistance R5 in R107 and controlled feedback circuit 209, R8 forms parallel circuit, resistance R106, R107, R5, after R8 parallel connection, resistance value reduces, reference source U7(TL431) voltage that sampled by resistance R4 will be raised, sampled voltage and U7(TL431) reference value 2.5V compare, through U7(TL431) amplification of internal error amplifier, switch chip U10 is fed back to through optocoupler U6, switch chip U10 will automatic adjustment switch pulsed frequency or pulse width, the secondary output voltage of Switching Power Supply is reduced, to make reference source U7(TL431) voltage that sampled by resistance R4 is 2.5V, thus make in the standby state, secondary output voltage+the 12V of Switching Power Supply is dragged down below 12V, specifically be pulled down to how many V, the requirement that can turn DC chip according to DC is arranged, ensure that DC turns DC chip and when standby, reliably exports 5V to remote-control receiving circuit 203, key press detecting circuit 204, readiness control circuit 208 and main control chip 205 provide power supply.Usually, by the resistance of adjusting resistance R106, R107, R5, R8, R4, the secondary output voltage+12V of Switching Power Supply can be pulled down to 5.2V ~ 9V.When so just can be implemented in standby, input voltage DC being turned DC chip reduces, thus is greatly reduced by stand-by power consumption.
As can be seen from the above description, the embodiment of the present invention can reach the effect reducing energy consumption preferably.
It should be noted that, can perform in the computer system of such as one group of computer executable instructions in the step shown in the process flow diagram of accompanying drawing, and, although show logical order in flow charts, but in some cases, can be different from the step shown or described by order execution herein.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, wherein, the circuit that Switching Power Supply primary part 100, DC turn DC circuit 201,5V cuts off circuit 206, readiness control circuit 208, controlled feedback circuit 209 can have same function by other substitutes, and does not limit above form.For a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a stand-by circuit for household electrical appliance, is characterized in that, comprising:
5V power cutting circuit, is arranged between 5V load and 5V power supply; And
Main control chip, is connected with described 5V power cutting circuit, cuts off the power supply of described 5V load for controlling described 5V power cutting circuit when receiving off signal or standby signal, wherein,
Described 5V power cutting circuit comprises:
First switch, Enable Pin is connected with described main control chip, and input end is connected with described 5V power supply, and output terminal is connected with described 5V load,
Described first switch is the electronic switch with low conducting internal resistance and low conduction voltage drop, wherein, the first input end of described electronic switch is connected with described 5V power supply respectively with the second input end, first earth terminal of input end side and the second earth terminal of output terminal side are connected to ground respectively, first electric capacity is connected between described input end and ground, and the second electric capacity is connected between output terminal and ground.
2. the stand-by circuit of household electrical appliance according to claim 1, is characterized in that, described stand-by circuit also comprises:
Output circuit, for providing output voltage; And
DC turns DC circuit, is arranged between described output circuit and described main control chip.
3. the stand-by circuit of household electrical appliance according to claim 2, is characterized in that, described DC turns DC circuit and comprises:
SN1106046D chip, VIN end is connected with described output circuit, and LX end is connected with described main control chip by inductance;
First electric capacity, first end is connected to the BOOT end of described SN1106046D chip, and the second end is connected to the LX end of described SN1106046D chip;
Second electric capacity, first end is connected to the ROSC end of described SN1106046D chip and ROSC end to be held with GND and is connected, and the SS that the second end is connected to described SN1106046D chip holds;
Diode, positive pole is connected to the GND end of described SN1106046D chip, and negative pole is connected to the LX end of described SN1106046D chip;
Resistance, first end is connected to the COMP end of described SN1106046D chip;
3rd electric capacity, first end is connected to the second end of described resistance, and the second end is connected to the GND end of described SN1106046D chip;
Inductance, first end is connected to the LX end of described SN1106046D chip, and the second end is connected to the VSENSE end of described SN1106046D chip; And
4th electric capacity, the 5th electric capacity and the 6th electric capacity three Capacitance parallel connections, the first end of described 4th electric capacity is connected to the second end of described inductance, and the second end is connected to the first end of described second electric capacity.
4. the stand-by circuit of household electrical appliance according to claim 1, is characterized in that, described stand-by circuit also comprises:
Output circuit, for providing output voltage;
Controlled feedback circuit, is connected with described output circuit, for regulating described output voltage;
Readiness control circuit, is connected with described controlled feedback circuit and described main control chip respectively; And
Described main control chip, also for when receiving off signal or standby signal, controls described readiness control circuit by output voltage described in described controlled feedback circuit conditioning.
5. the stand-by circuit of household electrical appliance according to claim 4, is characterized in that, described readiness control circuit comprises:
First resistance, when described first resistor coupled in parallel is between the voltage input end and reference source of described controlled feedback circuit, described controlled feedback circuit turns down described output voltage; And
Second switch, for connecting or disconnect the parallel branch at described first resistance place.
6. the stand-by circuit of household electrical appliance according to claim 5, is characterized in that,
Described second switch comprises PNP triode, a NPN triode and the 2nd NPN triode, wherein,
The emitter of described PNP triode is connected with the voltage input end of described controlled feedback circuit, and the collector of described PNP triode is connected with described first resistance,
The collector of a described NPN triode is connected with the base stage of described PNP triode, and the emitter of a described NPN triode is connected to ground, and the base stage of a described NPN triode is connected with described 5V power supply,
The collector of described 2nd NPN triode is connected with described 5V power supply, and the emitter of described 2nd NPN triode is connected to ground, and the base stage of described 2nd NPN triode is connected with described main control chip.
7. the stand-by circuit of household electrical appliance according to claim 6, is characterized in that, described second switch also comprises:
Second resistance, is connected between the base stage of described PNP triode and the collector of a described NPN triode;
3rd resistance, between the base stage being connected to a described NPN triode and described 5V power supply;
4th resistance, first end is connected to described 5V power supply, and the second end is connected between the collector of described 3rd resistance and described 2nd NPN triode; And
5th resistance, between the base stage being connected to described 2nd NPN triode and described main control chip.
8. a standby controlling method for household electrical appliance, is applied to the stand-by circuit of household electrical appliance, it is characterized in that, comprising:
Receive off signal or standby signal; And
Control 5V power cutting circuit cuts off the power supply of described 5V load, and wherein, described 5V power cutting circuit is arranged between 5V load and 5V power supply,
Wherein, after reception off signal or standby signal, described method also comprises:
Increase the partial pressure value of reference source in controlled feedback circuit;
Determine the difference of the partial pressure value of described reference source and the reference value of described reference source; And
Described difference is fed back to output circuit to reduce the input voltage that DC turns DC circuit.
9. the standby controlling method of household electrical appliance according to claim 8, is characterized in that, the power supply that control 5V power cutting circuit cuts off described 5V load comprises:
Connection between the input and output cutting off electronic switch U1 in described 5V power cutting circuit.
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| CN201210322032.4A CN103677034B (en) | 2012-09-03 | 2012-09-03 | The stand-by circuit of household electrical appliance and standby controlling method |
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| CN201210322032.4A CN103677034B (en) | 2012-09-03 | 2012-09-03 | The stand-by circuit of household electrical appliance and standby controlling method |
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| CN105302214B (en) * | 2015-10-22 | 2017-11-28 | 珠海格力电器股份有限公司 | Readiness control circuit, standby controlling method and electric equipment |
| CN110233563B (en) * | 2019-07-24 | 2024-01-16 | 浙江德力西电器有限公司 | Frequency modulation circuit and switching power supply |
| CN112910274A (en) * | 2020-12-14 | 2021-06-04 | 杭州先途电子有限公司 | Controller |
| CN113612369B (en) * | 2021-07-29 | 2022-12-09 | 海信冰箱有限公司 | Power supply circuit, household appliance and control method for household appliance |
| CN113467268B (en) * | 2021-07-29 | 2022-12-09 | 海信冰箱有限公司 | Control method for household appliance and household appliance |
| WO2023005643A1 (en) * | 2021-07-29 | 2023-02-02 | 海信冰箱有限公司 | Household electrical appliance and control method therefor |
| CN114690878B (en) * | 2021-12-27 | 2023-09-19 | 深圳微步信息股份有限公司 | 3.3V, 5V voltage output control circuit |
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