CN103677034A - Standby circuit of household appliance and standby control method - Google Patents
Standby circuit of household appliance and standby control method Download PDFInfo
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- CN103677034A CN103677034A CN201210322032.4A CN201210322032A CN103677034A CN 103677034 A CN103677034 A CN 103677034A CN 201210322032 A CN201210322032 A CN 201210322032A CN 103677034 A CN103677034 A CN 103677034A
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Abstract
The invention discloses a standby circuit of a household appliance and a standby control method. The standby circuit of the household appliance comprises a 5V power dump circuit and a main control chip, wherein the 5V power dump circuit is arranged between a 5V load and a 5V power supply, and the main control chip is connected with the 5V power dump circuit and used for controlling the 5V power dump circuit to cut off power supplied to the 5V load when the main control chip receives a shutdown signal or a standby signal. By means of the standby circuit of the household appliance, the 5V power dump circuit is arranged between the 5V power supply and the 5V load, so that the 5V power supply only supplies power to the main control chip and other devices and does not supply power to other 5V loads when the household appliance is in a standby state, and therefore the energy-saving effect is achieved.
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.The social investigation demonstration of the Yi Xiang family standby energy consumption completing according to Regius professor, 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, will bring huge economic benefit to society.The design proposal of the low-power consumption standby as shown in Figure 1 that at present, household electrical appliance adopt conventionally or the as shown in Figure 2 design proposal of low-power consumption standby.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-output accurately and control.In this circuit, the power supply of 12V load (+12V) is provided by the output of Switching Power Supply secondary, 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 when button off signal or standby signal, main control chip enters holding state, at this moment, 12V load quits work, but 5V load also in working order, can cause stand-by power consumption higher, generally can only accomplish 1W 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 being comprised of stabilivolt, and other principles are identical with the circuit shown in Fig. 1.By the circuit shown in Fig. 1 and Fig. 2, can reduce to a certain extent the power consumption of household electrical appliance, still, the effect of the reduction power consumption that these two kinds of circuit can play is also very limited.
For the higher problem of household electrical appliance stand-by power consumption in prior art, effective solution is not yet proposed at present.
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 higher problem of household electrical appliance stand-by power consumption in prior art.
To achieve these goals, according to an aspect of the present invention, provide a kind of stand-by circuit of household electrical appliance.
According to the stand-by circuit of household electrical appliance of the present invention, comprise: 5V power cutting circuit, is arranged between 5V load and 5V power supply; And main control chip, be connected with 5V power cutting circuit, for control 5V power cutting circuit when receiving off signal or standby signal, cut off the power supply of 5V load.
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, the 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, the first earth terminal of input end one side is connected with ground respectively with the second earth terminal of output terminal one side, the 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 output voltage is provided; And DC turns DC circuit, be 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; The 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; The second electric capacity, ROSC end and ROSC end that first end is connected to SN1106046D chip are connected with GND end, and the second end is connected to the SS end of SN1106046D chip; 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; The 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 three Capacitance parallel connections of the 6th electric capacity, 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 output voltage is provided; Controlled feedback circuit, is connected with output circuit, for regulation output voltage; Readiness control circuit, is connected with main control chip with controlled feedback circuit respectively; And main control chip is also for when receiving off signal or standby signal, controls readiness control circuit by controlled feedback circuit conditioning output voltage.
Further, readiness control circuit comprises: the first resistance, and when the first resistance is connected in parallel between the voltage input end of controlled feedback circuit and reference source, controlled feedback circuit is turned down output voltage; And second switch, for connecting or disconnect the parallel branch at the first resistance place.
Further, second switch comprises PNP triode, the 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 with 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 with 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; The 3rd resistance, is connected between the base stage and 5V power supply of a NPN triode; The 4th resistance, first end is connected to 5V power supply, and the second end is connected between the 3rd resistance and the collector of the 2nd NPN triode; And the 5th resistance, be connected between the base stage and main control chip of the 2nd NPN triode.
To achieve these goals, according to another aspect of the present invention, provide a kind of standby controlling method of household electrical appliance.The method can realize by the readiness control circuit based on household electrical appliance provided by the invention.
According to the idle method of household electrical appliance of the present invention, comprise: receive off signal or standby signal; And control the power supply that 5V power cutting circuit cuts off 5V load, wherein, 5V power cutting circuit is arranged between 5V load and 5V power supply.
Further, the power supply of control 5V power cutting circuit cut-out 5V load comprises: the connection in cut-out 5V power cutting circuit between the input and output of electronic switch U1.
Further, after receiving off signal or standby signal, said method also comprises: the partial pressure value that increases 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 DC, turn the input voltage of DC circuit.
Because the device employing 5V power supplys such as main control chip of household electrical appliance are powered, therefore 5V power supply is always in conducting state, therefore in 5V load, there is power consumption always, the present invention is provided with 5V power cutting circuit between 5V power supply and 5V load, thereby making 5V power supply when standby is only main control chip, remote-control receiving circuit, these need the 5V load supplying of work key press detecting circuit and readiness control circuit when standby, and to 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 solved the higher problem of household electrical appliance stand-by power consumption in technology, and then reached energy-conservation effect.
Accompanying drawing explanation
The accompanying drawing that forms the application's a part is used to provide a further understanding of the present invention, and schematic description and description of the present invention is used 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 according to the structured flowchart of the stand-by circuit of the household electrical appliance of 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 according to the circuit diagram of the stand-by circuit of the household electrical appliance of first preferred embodiment of the invention;
Fig. 6 is according to the circuit diagram of the stand-by circuit of the household electrical appliance of second preferred embodiment of the invention; And
Fig. 7 is according to the process flow diagram of the standby controlling method of the household electrical appliance of the embodiment of the present invention.
Embodiment
It should be noted that, in the situation that not conflicting, embodiment and the feature in embodiment in the application can combine mutually.Describe below with reference to the accompanying drawings and in conjunction with the embodiments the present invention in detail.
The embodiment of the present invention provides a kind of stand-by circuit of household electrical appliance, below the stand-by circuit of household electrical appliance that the embodiment of the present invention is provided be introduced.
Fig. 3 is according to the structured flowchart of the stand-by circuit of the household electrical appliance of 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.
In the present embodiment, between 5V power supply and 5V load, be provided with 5V power cutting circuit 206, thereby making 5V power supply when standby is only the device power supplies such as main control chip, and to other 5V load supplyings, therefore solve the higher problem of household electrical appliance stand-by power consumption in prior art, and then reached 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, can realize easily conducting and disconnection between 5V load and power supply.
Further, the first switch in the present embodiment can be 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, the first earth terminal of input end one side is connected with ground respectively with the second earth terminal of output terminal one side, the first capacitor C 5 is connected between input end and ground, and the second capacitor C 7 is connected between output terminal and ground.
Stand-by circuit in the present embodiment also comprises that output circuit and DC turn 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.
In order to improve DC, turn the efficiency of 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 is as feedback end, for making LX end can accurately export 5V voltage by inductance L 1; The first end of the first capacitor C 9 is connected to the BOOT end of SN1106046D chip, and the second end is connected to the LX end of SN1106046D chip; ROSC end and ROSC end that the first end of the second capacitor C 12 is connected to SN1106046D chip are connected with GND end, and the second end is connected to the SS end of SN1106046D chip; 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 R 21 is connected to the COMP end of SN1106046D chip; The first end of the 3rd capacitor C 14 is connected to the second end of resistance R 21, 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; The 4th electric capacity, the 5th electric capacity and three Capacitance parallel connections of the 6th electric capacity, the first end of the 4th capacitor C 1 is connected to the second end of inductance, and the second end is connected to the first end of the second capacitor C 12.SN1106046D chip is the chip of a high conversion efficiency, and when underloading, the conversion efficiency of (during standby) is more than 80% for it, and during underloading, its input voltage can also reliable output 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 main control chip 205 with controlled feedback circuit 209 respectively.Main control chip 205, also for when receiving off signal or standby signal, is controlled readiness control circuit 208 by controlled feedback circuit 209 regulation output voltages.
Particularly, readiness control circuit comprises the first resistance and second switch, and when the first resistance is connected in parallel between the voltage input end of controlled feedback circuit 209 and reference source, controlled feedback circuit 209 is turned down output voltage, in the present embodiment, the first resistance can be realized by R106 and R107 series connection.Second switch is for connecting or disconnect the parallel branch at the first resistance place.
Further, second switch comprises PNP triode Q6, the 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 with 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 with 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 R 108 is connected between the base stage of PNP triode and the collector of a NPN triode Q5; The 3rd resistance R 111 is connected between the base stage and 5V power supply of a NPN triode Q5; The first end of the 4th resistance R 109 is connected to 5V power supply, and the second end is connected between the 3rd resistance R 111 and the collector of the 2nd NPN triode Q7; The 5th resistance R 110 is connected between the base stage and main control chip 205 of the 2nd NPN triode Q7.
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 be used as preferred implementation embodiment illustrated in fig. 3.
As shown in Figure 4, the stand-by circuit of these household electrical appliance comprises that 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- out 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, direct current with 12V flows out, 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 power supplies, part 5V direct current cuts off circuit 206 by 5V and flows into 5V load circuit 207, some flows into readiness control circuit 208, by readiness control circuit 208, regulate the output voltage of secondary output circuit 200.
Fig. 5 is according to the circuit diagram of the stand-by circuit of the household electrical appliance of first preferred embodiment of the invention.This embodiment can be used as preferred implementation embodiment illustrated in fig. 3.
As shown in Figure 5, stand-by circuit Switching Power Supply primary part 100, secondary output circuit 200, the DC of household electrical appliance turn DC circuit 201,12V load 202, remote-control receiving circuit 203, key press detecting circuit 204, main control chip 205,5V cut- out circuit 206,5V load circuit 207, readiness control circuit 208 and controlled feedback circuit 209.
Wherein, Switching Power Supply primary part 100 turns DC circuit 201, readiness control circuit 208 and controlled feedback circuit 209 with secondary output circuit 200, DC and is connected, for above-mentioned several circuit supplies, and can be by forming backfeed loop with controlled feedback circuit 209, the output voltage of gauge tap power supply, makes the satisfactory voltage of output voltage.
At 5V, cut off in circuit 206, 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 TI for example, also can be other devices with 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 is not worked, in the present embodiment, by remote-control receiving circuit 203, key press detecting circuit 204, be considered as+the 5V1 of 5V power supply of readiness control circuit 208 and main control chip 205, by be considered as+5V2 of the power supply of other 5V loads, when U1 is during in conducting state, + 5V1 and+5V2 approximately equal, when U1 is during 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 cut-off, + 5V1 is by resistance R 109, R111 driving N PN triode Q5, triode Q5 conducting, thereby make emitter and the base stage of PNP triode Q6 have pressure reduction, make PNP triode Q6 conducting, resistance R 106, resistance R 5 in R107 and controlled feedback circuit 209, R8 forms parallel circuit, resistance R 106, R107, R5, after R8 parallel connection, resistance value reduces, reference source U7(TL431) voltage sampling by resistance R 4 will raise, sampled voltage and U7(TL431) reference value 2.5V comparison, through U7(TL431) amplification of internal error amplifier, through optocoupler U6, feed back to switch chip U10, switch chip U10 will automatic adjustment switch pulsed frequency or pulse width, the secondary output voltage of Switching Power Supply is reduced, so that reference source U7(TL431) voltage sampling by resistance R 4 is 2.5V, thereby make under holding 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 arranges, guarantee 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, can pass through the resistance of adjusting resistance R106, R107, R5, R8, R4, the secondary output voltage+12V of Switching Power Supply is pulled down to 5.2V ~ 9V.So just can realize when standby, the input voltage that DC is turned to DC chip reduces, thereby stand-by power consumption is reduced greatly.
DC turns in DC circuit 201, DC-DC chip U3(is for example: the SN1106046D of TI, also can be other devices with similar functions) be the chip of a high conversion efficiency, it is when underloading, conversion efficiency while being standby is more than 80%, and during underloading, its input voltage can also reliable output 5V when 5.3V ~ 6.5V.Like this when standby, can adjust the resistance of R106, R107 in readiness control circuit 208 and controlled feedback circuit 209, R5, R8, R4, make the input voltage of U3 be reduced to 5.3V ~ 6.5V, further reduce stand-by power consumption.
In Switching Power Supply primary part 100, switch chip U10 enters the mode of operation of hop cycle or frequency jitter, reduces as far as possible the idling consumption of Switching Power Supply part.
Fig. 6 is according to the circuit diagram of the stand-by circuit of the household electrical appliance of second preferred embodiment of the invention.This embodiment can be used as preferred implementation embodiment illustrated in fig. 3.
As shown in Figure 6, this preferred embodiment is to have omitted key press detecting circuit 204 with the difference of the first preferred embodiment, thereby cancelled the detection to push button signalling, household electrical appliances for certain model, for example the air-conditioning of certain model, only can control by remote control, therefore, the detection of cancellation to push button signalling, has simplified the structure of the stand-by circuit of household electrical appliance.
The embodiment of the present invention also 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 is realized.
Fig. 7 is according to the process flow diagram of the standby controlling method of the household electrical appliance of 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, can cut off the connection between the input and output of electronic switch U1 in 5V power cutting circuit.
As shown in Figure 5, at 5V, cut off in circuit 206, 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 TI for example, also can be other devices with 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 is not worked, in the present embodiment, by remote-control receiving circuit 203, key press detecting circuit 204, be considered as+the 5V1 of 5V power supply of readiness control circuit 208 and main control chip 205, by be considered as+5V2 of the power supply of other 5V loads, when U1 is during in conducting state, + 5V1 and+5V2 approximately equal, when U1 is during 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, controls the power supply that 5V power cutting circuit cuts off 5V load, and wherein, 5V power cutting circuit is arranged between 5V load and 5V power supply.
It can be that the 5V providing in the corresponding embodiment of Fig. 5 to Fig. 6 cuts off circuit that 5V in the present embodiment cuts off circuit.
In order to obtain easily 5V power supply, preferably, before receiving off signal or standby signal, said method also comprises: control DC turns DC circuit and becomes 5V voltage to obtain 5V power supply 12V voltage transitions.
For when the standby, the input voltage that DC is turned to DC chip reduces, and preferably, turns DC circuit and 12V voltage transitions is become 5V voltage with after obtaining 5V power supply controlling DC, and said method also comprises: the partial pressure value that increases 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 DC, turn the input voltage of 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 cut-off, + 5V1 is by resistance R 109, R111 driving N PN triode Q5, triode Q5 conducting, thereby make emitter and the base stage of PNP triode Q6 have pressure reduction, make PNP triode Q6 conducting, resistance R 106, resistance R 5 in R107 and controlled feedback circuit 209, R8 forms parallel circuit, resistance R 106, R107, R5, after R8 parallel connection, resistance value reduces, reference source U7(TL431) voltage sampling by resistance R 4 will raise, sampled voltage and U7(TL431) reference value 2.5V comparison, through U7(TL431) amplification of internal error amplifier, through optocoupler U6, feed back to switch chip U10, switch chip U10 will automatic adjustment switch pulsed frequency or pulse width, the secondary output voltage of Switching Power Supply is reduced, so that reference source U7(TL431) voltage sampling by resistance R 4 is 2.5V, thereby make under holding 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 arranges, guarantee 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, can pass through the resistance of adjusting resistance R106, R107, R5, R8, R4, the secondary output voltage+12V of Switching Power Supply is pulled down to 5.2V ~ 9V.So just can realize when standby, the input voltage that DC is turned to DC chip reduces, thereby stand-by power consumption is reduced greatly.
As can be seen from the above description, the embodiment of the present invention can reach the effect that reduces energy consumption preferably.
It should be noted that, in the step shown in the process flow diagram of accompanying drawing, can in the computer system such as one group of computer executable instructions, carry out, and, although there is shown logical order in flow process, but in some cases, can carry out shown or described step with the order being different from herein.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, wherein, Switching Power Supply primary part 100, DC turn DC circuit 201,5V to be cut off the circuit that circuit 206, readiness control circuit 208, controlled feedback circuit 209 can have same function by other and 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 modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (12)
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 control described 5V power cutting circuit when receiving off signal or standby signal.
2. the stand-by circuit of household electrical appliance according to claim 1, is characterized in that, described 5V power cutting circuit comprises:
The 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.
3. the stand-by circuit of household electrical appliance according to claim 2, is characterized in that,
Described the 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, the first earth terminal of input end one side is connected with ground respectively with the second earth terminal of output terminal one side, the first electric capacity is connected between described input end and ground, and the second electric capacity is connected between output terminal and ground.
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; And
DC turns DC circuit, is arranged between described output circuit and described main control chip.
5. the stand-by circuit of household electrical appliance according to claim 4, 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;
The 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;
The second electric capacity, ROSC end and ROSC end that first end is connected to described SN1106046D chip are connected with GND end, and the second end is connected to the SS end of described SN1106046D chip;
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;
The 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
The 4th electric capacity, the 5th electric capacity and three Capacitance parallel connections of the 6th electric capacity, the first end of described the 4th electric capacity is connected to the second end of described inductance, and the second end is connected to the first end of described the second electric capacity.
6. 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 main control chip with described controlled feedback circuit respectively; And
Described main control chip, also for when receiving off signal or standby signal, is controlled described readiness control circuit by output voltage described in described controlled feedback circuit conditioning.
7. the stand-by circuit of household electrical appliance according to claim 6, is characterized in that, described readiness control circuit comprises:
The first resistance, when described the first resistance is connected in parallel between the voltage input end of described controlled feedback circuit and reference source, described controlled feedback circuit is turned down described output voltage; And
Second switch, for connecting or disconnect the parallel branch at described the first resistance place.
8. the stand-by circuit of household electrical appliance according to claim 7, 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 the 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 with ground, and the base stage of a described NPN triode is connected with described 5V power supply,
The collector of described the 2nd NPN triode is connected with described 5V power supply, and the emitter of described the 2nd NPN triode is connected with ground, and the base stage of described the 2nd NPN triode is connected with described main control chip.
9. the stand-by circuit of household electrical appliance according to claim 8, is characterized in that, described second switch also comprises:
The second resistance, is connected between the base stage of described PNP triode and the collector of a described NPN triode;
The 3rd resistance, is connected between the base stage and described 5V power supply of a described NPN triode;
The 4th resistance, first end is connected to described 5V power supply, and the second end is connected between described the 3rd resistance and the collector of described the 2nd NPN triode; And
The 5th resistance, is connected between the base stage and described main control chip of described the 2nd NPN triode.
10. 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 the power supply that 5V power cutting circuit cuts off described 5V load, wherein, described 5V power cutting circuit is arranged between 5V load and 5V power supply.
The standby controlling method of 11. household electrical appliance according to claim 10, is characterized in that, the power supply that control 5V power cutting circuit cuts off described 5V load comprises:
Cut off the connection between the input and output of electronic switch U1 in described 5V power cutting circuit.
The standby controlling method of 12. household electrical appliance according to claim 10, is characterized in that, after receiving 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 and to reduce described DC, turn the input voltage of DC circuit.
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