CN202455269U - Switch power supply with standby switching circuit - Google Patents
Switch power supply with standby switching circuit Download PDFInfo
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- CN202455269U CN202455269U CN201120401232XU CN201120401232U CN202455269U CN 202455269 U CN202455269 U CN 202455269U CN 201120401232X U CN201120401232X U CN 201120401232XU CN 201120401232 U CN201120401232 U CN 201120401232U CN 202455269 U CN202455269 U CN 202455269U
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- power supply
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The present utility model discloses a switch power supply with a standby switching circuit, and a switch power supply circuit. The switch power supply circuit is provided to obviously reduce standby power consumption of the switch power supply. The switch power supply comprises a switch power supply control chip, a power supply primary coil I, a power supply primary coil II, a power supply primary coil III, at least two power supply secondary coils, and a power supply secondary coil sampling and feedback circuit; the voltage output end of the switch power supply control chip is connected with the voltage input end of the power supply primary coil I; and the circuit also comprises a power supply primary standby switching circuit and a power supply secondary standby switching circuit. When in standby mode, the power supply working mode is changed by the switching circuits, a power supply primary high voltage circuit is changed into power supply chip supply voltage, a secondary high voltage circuit is changed into voltage needed by a standby one-chip microcomputer, and other voltage is greatly reduced and basically in a power off state.
Description
Technical field
The utility model relates to a kind of switching power circuit, particularly a kind of switching power circuit that can significantly reduce stand-by power consumption.
Background technology
At present, household appliances have become requisite thing in our daily life, and it basically all will use Switching Power Supply, all require energy-saving and emission-reduction, increasing market all to require complete machine when standby, to reduce stand-by power consumption now both at home and abroad.Existing Switching Power Supply standby mode generally is that the household electrical appliances main circuit gets into low-power consumption mode or switch power source output voltage is partly added the switch control model.These two kinds of patterns all have certain defective, get into low-power consumption mode for main circuit, because power supply is also exported normal plurality of voltages, cause the stand-by power consumption of product bigger; Add the switch pattern for the power supply output, though can solve the stand-by power consumption problem, cost is than higher, complicated circuit.
Fig. 1 is the existing switching power circuit that does not have the standby commutation circuit, comprises Switching Power Supply control chip, power supply primary coil one, power supply primary coil two, at least 1 power supply secondary coil, power supply secondary coil sampling feedback circuit; The voltage output end of Switching Power Supply control chip is connected with the voltage input end of power supply primary coil one; Power supply primary coil two is to the power supply of Switching Power Supply control chip, and power supply secondary coil three is used for powering load, and the sampling end of power supply secondary coil sampling feedback circuit and FEEDBACK CONTROL end are connected with the voltage output end of power supply secondary coil one simultaneously.Certainly, according to the electricity consumption needs, the different power supply secondary coil of a plurality of output voltages can also be set.
The utility model content
The goal of the invention of the utility model is: the problem to above-mentioned existence provides a kind of Switching Power Supply that can significantly reduce the Switching Power Supply stand-by power consumption.
The technical scheme that the utility model adopts is such: a kind of Switching Power Supply with standby commutation circuit; Comprise Switching Power Supply control chip, power supply primary coil one, power supply primary coil two, power supply primary coil three, at least 2 power supply secondary coils, power supply secondary coil sampling feedback circuit; The voltage output end of Switching Power Supply control chip is connected with the voltage input end of power supply primary coil one; Also comprise elementary standby commutation circuit of power supply and the secondary standby commutation circuit of power supply;
The power input of Switching Power Supply control chip is connected with the voltage output end of power supply primary coil two through first diode; The anode of first diode is connected with the voltage output end of power supply primary coil two, and the negative electrode of first diode is connected with the power input of Switching Power Supply control chip;
The elementary standby commutation circuit of said power supply comprises power input and standby switching signal output; Power input is connected with power supply primary coil three voltage output ends, and said standby switching signal output is connected between the power input and first diode cathode of said Switching Power Supply control chip;
The sampling end of power supply secondary coil sampling feedback circuit is connected with the voltage output end of power supply secondary coil one through second diode, and the FEEDBACK CONTROL end of power supply secondary coil sampling feedback circuit is connected with the voltage output end of power supply secondary coil one through the 3rd diode; And the anode of second diode, the 3rd diode all is connected with the voltage output end of power supply secondary coil one;
The secondary standby commutation circuit of said power supply comprises signal input end, standby power output and switching circuit; The sampling end of power supply secondary coil sampling feedback circuit and FEEDBACK CONTROL end are connected with the voltage output end of power supply secondary coil two through said switching circuit simultaneously; Said signal input end is used for the conducting or the disconnection of control switch circuit;
The ratio r of the voltage of the voltage of said power supply secondary coil two outputs and one output of power supply secondary coil is greater than 1.
Preferably, the elementary standby commutation circuit of said power supply inside comprises voltage-stabiliser tube, first switch triode, the 4th diode, the 5th diode; The anode of the 4th diode is connected with the voltage output end of power supply primary coil three, and its negative electrode is connected to the collector electrode of first switch triode; The negative electrode of voltage-stabiliser tube is connected to the negative electrode of the 4th diode, the plus earth of voltage-stabiliser tube; And the negative electrode of voltage-stabiliser tube also is connected with the base stage of first switch triode; The emitter of first switch triode is connected with the anode of the 5th diode, and the negative electrode of the 5th diode is connected between the power input and first diode cathode of said Switching Power Supply control chip;
The voltage that power supply primary coil three is exported when the power supply operate as normal should satisfy this voltage dwindle r doubly after, still greater than the voltage on the said voltage-stabiliser tube.
Preferably, the secondary standby commutation circuit of said power supply inside also comprises the 3rd switch triode; And said switching circuit is the second switch triode, and its emitter is connected with the voltage output end of power supply secondary coil two, and its collector electrode is connected with the sampling end and the FEEDBACK CONTROL end of power supply secondary coil sampling feedback circuit; The very said standby power output of the current collection of second switch triode;
The base stage of the 3rd switch triode is a signal input end, its grounded emitter, and its collector electrode is connected with the base stage of second switch triode.
Preferably, said power supply secondary coil sampling feedback circuit comprises first resistance, second resistance and fixing output three terminal regulator; Wherein first resistance is connected with second resistor group, the other end ground connection of second resistance, and the other end of first resistance is said sampling end; The voltage of first resistance and the second electric resistance partial pressure gained exports the sampling pin of fixing output three terminal regulator to, and the voltage output pin of fixing output three terminal regulator is described FEEDBACK CONTROL end.
Preferably, the voltage of power supply primary coil two outputs is 18V, and the voltage of power supply primary coil three outputs is 100V, and the voltage of power supply secondary coil one output is 5V, and the voltage of power supply secondary coil two outputs is 40V; The output voltage of said fixedly output three terminal regulator is 5V, and first resistance equates with the resistance of second resistance.
In sum, owing to adopted technique scheme, the beneficial effect of the utility model is:
1, circuit structure is simple, cost is low, reliability is high, can be widely used in various power supplys;
2, a kind of brand-new power supply standby mode has been proposed; Under ideal case; The standby commutation circuit conducting of power supply primary and secondary; Simultaneously become the low pressure (like 5V) that single-chip microcomputer and remote control equipment need to the high-tension circuit of power supply secondary coil, the voltage that all the other power supplys are exported will reduce (generally be normal voltage about 1/5 to 1/10) greatly, promptly be equivalent to off state.At this time the entire circuit system has only a small amount of low-power consumption components and parts work such as single-chip microcomputer and remote control equipment, and stand-by power consumption is reduced greatly, generally has only about 0.2W.
Description of drawings
Fig. 1 is the switching power circuit that does not have the standby commutation circuit.
Fig. 2 is the switching power circuit that has increased the standby commutation circuit
Embodiment
Below in conjunction with accompanying drawing, the utility model is done detailed explanation.
For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
As shown in Figure 2, the utility model has increased by 1 power supply primary coil and 1 power supply secondary coil, power supply primary coil standby commutation circuit, power supply secondary coil standby commutation circuit on circuit base shown in Figure 1.
Concrete circuit structure is: the power input of Switching Power Supply control chip is connected with the voltage output end of power supply primary coil two through diode D08; The anode of diode D08 is connected with the voltage output end of power supply primary coil two, and the negative electrode of diode D08 is connected with the power input of Switching Power Supply control chip.
The elementary standby commutation circuit of said power supply comprises power input and standby switching signal output; Power input is connected with power supply primary coil three voltage output ends, and said standby switching signal output is connected between the power input and diode D08 negative electrode of said Switching Power Supply control chip.
The sampling end of power supply secondary coil sampling feedback circuit is connected with the voltage output end of power supply secondary coil one through diode D12, and the FEEDBACK CONTROL end of power supply secondary coil sampling feedback circuit is connected with the voltage output end of power supply secondary coil one through diode D11; And the anode of diode D12, diode D11 all is connected with the voltage output end of power supply secondary coil one.
The secondary standby commutation circuit of said power supply comprises signal input end SB, standby power output SB5V and switching circuit; The sampling section of power supply secondary coil sampling feedback circuit and FEEDBACK CONTROL end are connected with the voltage output end of power supply secondary coil two through said switching circuit simultaneously; Said signal input end SB is used to receive the control signal of MCU output, the conducting of control switch circuit or disconnection.
Power supply primary coil three is a high-tension coil with power supply secondary coil two.During standby, commutation circuit changes power mode, and power supply primary coil three is the power supply of Switching Power Supply control chip, and power supply secondary coil two is required voltage such as single-chip microcomputer during for standby, and all the other voltages are because reduction greatly is in off-position basically.
A specific embodiment of the elementary standby commutation circuit of power supply is that its inside comprises voltage-stabiliser tube D05, switch triode Q01, diode D06, diode D07; The anode of diode D06 is connected with the voltage output end of power supply primary coil three, and its negative electrode is connected to the collector electrode of switch triode Q01; The negative electrode of voltage-stabiliser tube D05 is connected to the negative electrode of diode D06, the plus earth of voltage-stabiliser tube D05 through a resistance; And the negative electrode of voltage-stabiliser tube D05 also is connected with the base stage of switch triode Q01; The emitter of switch triode Q01 is connected with the anode of diode D07, and the negative electrode of diode D07 is connected between the power input and diode D08 negative electrode of said Switching Power Supply control chip.
A specific embodiment of the secondary standby commutation circuit of power supply is that its inside also comprises switch triode Q03.And said switching circuit is switch triode Q02, and its emitter is connected with the voltage output end of power supply secondary coil two, and its collector electrode is connected with the sampling end and the FEEDBACK CONTROL end of power supply secondary coil sampling feedback circuit; The very said standby power output of the current collection of switch triode Q02 SB5V.
The base stage of switch triode Q03 is signal input end SB, its grounded emitter, and its collector electrode is connected with the base stage of switch triode Q02.
A specific embodiment of power supply secondary coil sampling feedback circuit is that it comprises resistance R 10, resistance R 16 and fixing output three terminal regulator N03; Wherein resistance R 10 is connected for 16 groups with resistance R, the other end ground connection of resistance R 16, and the other end of resistance R 10 is said sampling end; Resistance R 10 exports the fixing sampling pin 1 of exporting three terminal regulator N03 to the voltage of resistance R 16 dividing potential drop gained, and the voltage output pin 3 of fixing output three terminal regulator N03 is described FEEDBACK CONTROL end.
Below set forth the utility model circuit working principle: for the ease of explanation; Might as well set when whole power circuit operate as normal; The voltage of power supply primary coil two outputs is 18V; The voltage of power supply primary coil three outputs is 100V, and the voltage of power supply secondary coil one output is 5V, and the voltage of power supply secondary coil two outputs is 40V.During the power supply operate as normal, MCU exports a low level to the SB end, not conducting of Q03, and Q02 can conducting yet so.At this moment power supply secondary coil one is exported 5V, voltages such as SB5V.When this state, because not conducting of Q02, SB5V is that power supply secondary coil one output 5V voltage obtains the SB5V voltage that magnitude of voltage is about 4.8V through diode D12 step-down.Be about 40V behind the power supply process D16 rectifying and wave-filtering of power supply secondary coil two outputs in addition.During the power supply operate as normal; (voltage after the general voltage stabilizing is lower than the voltage behind the D06 rectifying and wave-filtering to high pressure behind the D06 rectifying and wave-filtering (about 100V) through voltage-stabiliser tube D05; Elect the 15V voltage stabilizing didoe as like voltage-stabiliser tube D05) about the anodal about 15V of voltage that produces of switch triode Q01 base stage; Switch triode Q01 is in cut-off state, and promptly the operating voltage Vcc of the Switching Power Supply control chip of power supply primary coil supplies with (18V) after by the D08 rectifying and wave-filtering.
When whole power circuit needed standby, MCU sent out a high level signal and holds to SB, after the SB signal becomes high level; Drive Q03 and make its conducting, also conducting of Q02 at this moment, promptly power supply secondary coil two is through D16 output 40V voltage; 40V voltage is sampled through R10 and R16 through Q02 again, because the inner reference voltage of fixing output three terminal regulator N03 is 2.5V; The voltage of resistance R 10, resistance R 16 samplings is greater than 2.5V; The FEEDBACK CONTROL pin 3 of fixing output three terminal regulator N03 will be adjusted the voltage of power supply secondary coil two outputs, i.e. the voltage of D16 output is fixed as 5V, and then SB5V end output 5V voltage supplies single-chip microprocessor MCU and remote control equipment etc.Because the voltage of power supply secondary coil two outputs is about 40V during the power supply operate as normal; When the voltage of power supply secondary coil two output becomes 5V (reduce to original 1/8) like this; The output voltage of all the other power supply secondary coils also is reduced to original about 1/8 in proportion; For example: the voltage of power supply secondary coil one output is 5/8V, promptly is equivalent to be in off state.Be that holding state has only the SB5V end to MCU and remote control equipment etc. 5V to be provided voltage, MCU and remote control power consumption are very low during owing to standby, so stand-by power consumption is just very low, generally between 0.2 ~ 0.3W.
When being in holding state; Because the voltage that power supply primary coil two is exported after through the D08 rectifying and wave-filtering is reduced to 1/8 original (18/8V), so the voltage of power supply primary coil two outputs can not be to satisfy Switching Power Supply control chip work power supply needs, but when this state; The voltage that power supply primary coil three is exported after through the D06 rectification is about about 16V; Voltage after the voltage-stabiliser tube D05 voltage stabilizing still is 15V, and switch triode Q01 conducting at this moment obtains about 16V left and right sides voltage at the D07 positive pole; This voltage provides operating voltage to chip, and at this moment diode D08 ends.
Be not difficult to learn by the foregoing circuit operation principle; If will realize after MCU holds the switching signal of output high level to SB; Commutation circuit can realize holding state smoothly, and necessary technology characteristic is that the ratio a of the voltage exported of voltage and the power supply secondary coil one of said power supply secondary coil two outputs should be greater than 1, in the time of could realizing holding state like this; The voltage of power supply secondary coil two outputs is dragged down by power supply secondary coil sampling feedback circuit; Power supply secondary coil two dwindles according to a certain percentage, and then causes all the other each power supply secondary coil output voltages by same reduced scale, so that switching power circuit gets into holding state.The voltage that power supply primary coil three is exported when the power supply operate as normal should satisfy this voltage dwindle r doubly after; Still greater than the voltage on the voltage-stabiliser tube D05; Could guarantee like this when holding state; Switch triode Q01 can conducting, and then is supplied power to the Switching Power Supply control chip through D06, D07 by power supply primary coil three.
The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; Any modification of being done within all spirit and principles at the utility model, be equal to replacement and improvement etc., all should be included within the protection range of the utility model.
Claims (5)
1. the Switching Power Supply with standby commutation circuit comprises Switching Power Supply control chip, power supply primary coil one, power supply primary coil two, power supply primary coil three, at least 2 power supply secondary coils, power supply secondary coil sampling feedback circuit; The voltage output end of Switching Power Supply control chip is connected with the voltage input end of power supply primary coil one; It is characterized in that, also comprise elementary standby commutation circuit of power supply and the secondary standby commutation circuit of power supply;
The power input of Switching Power Supply control chip is connected with the voltage output end of power supply primary coil two through first diode; The anode of first diode is connected with the voltage output end of power supply primary coil two, and the negative electrode of first diode is connected with the power input of Switching Power Supply control chip;
The elementary standby commutation circuit of said power supply comprises power input and standby switching signal output; Power input is connected with power supply primary coil three voltage output ends, and said standby switching signal output is connected between the power input and first diode cathode of said Switching Power Supply control chip;
The sampling end of power supply secondary coil sampling feedback circuit is connected with the voltage output end of power supply secondary coil one through second diode, and the FEEDBACK CONTROL end of power supply secondary coil sampling feedback circuit is connected with the voltage output end of power supply secondary coil one through the 3rd diode; And the anode of second diode, the 3rd diode all is connected with the voltage output end of power supply secondary coil one;
The secondary standby commutation circuit of said power supply comprises signal input end, standby power output and switching circuit; The sampling end of power supply secondary coil sampling feedback circuit and FEEDBACK CONTROL end are connected with the voltage output end of power supply secondary coil two through said switching circuit simultaneously; Said signal input end is used for the conducting or the disconnection of control switch circuit;
The ratio r of the voltage of the voltage of said power supply secondary coil two outputs and one output of power supply secondary coil is greater than 1.
2. the Switching Power Supply with standby commutation circuit according to claim 1 is characterized in that, the elementary standby commutation circuit of said power supply inside comprises voltage-stabiliser tube, first switch triode, the 4th diode, the 5th diode; The anode of the 4th diode is connected with the voltage output end of power supply primary coil three, and its negative electrode is connected to the collector electrode of first switch triode; The negative electrode of voltage-stabiliser tube is connected to the negative electrode of the 4th diode, the plus earth of voltage-stabiliser tube; And the negative electrode of voltage-stabiliser tube also is connected with the base stage of first switch triode; The emitter of first switch triode is connected with the anode of the 5th diode, and the negative electrode of the 5th diode is connected between the power input and first diode cathode of said Switching Power Supply control chip;
The voltage that power supply primary coil three is exported when the power supply operate as normal should satisfy this voltage dwindle r doubly after, still greater than the voltage on the said voltage-stabiliser tube.
3. the Switching Power Supply with standby commutation circuit according to claim 1 and 2 is characterized in that, the secondary standby commutation circuit of said power supply inside also comprises the 3rd switch triode; And said switching circuit is the second switch triode, and its emitter is connected with the voltage output end of power supply secondary coil two, and its collector electrode is connected with the sampling end and the FEEDBACK CONTROL end of power supply secondary coil sampling feedback circuit; The very said standby power output of the current collection of second switch triode;
The base stage of the 3rd switch triode is a signal input end, its grounded emitter, and its collector electrode is connected with the base stage of second switch triode.
4. the Switching Power Supply with standby commutation circuit according to claim 3 is characterized in that, said power supply secondary coil sampling feedback circuit comprises first resistance, second resistance and fixing output three terminal regulator; Wherein first resistance is connected with second resistor group, the other end ground connection of second resistance, and the other end of first resistance is said sampling end; The voltage of first resistance and the second electric resistance partial pressure gained exports the sampling pin of fixing output three terminal regulator to, and the voltage output pin of fixing output three terminal regulator is described FEEDBACK CONTROL end.
5. the Switching Power Supply with standby commutation circuit according to claim 4; It is characterized in that; The voltage of power supply primary coil two outputs is 18V; The voltage of power supply primary coil three outputs is 100V, and the voltage of power supply secondary coil one output is 5V, and the voltage of power supply secondary coil two outputs is 40V; The output voltage of said fixedly output three terminal regulator is 5V, and first resistance equates with the resistance of second resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120401232XU CN202455269U (en) | 2011-10-20 | 2011-10-20 | Switch power supply with standby switching circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120401232XU CN202455269U (en) | 2011-10-20 | 2011-10-20 | Switch power supply with standby switching circuit |
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| Publication Number | Publication Date |
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| CN202455269U true CN202455269U (en) | 2012-09-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201120401232XU Expired - Lifetime CN202455269U (en) | 2011-10-20 | 2011-10-20 | Switch power supply with standby switching circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106849688A (en) * | 2017-02-14 | 2017-06-13 | 深圳市华星光电技术有限公司 | A kind of circuit and liquid crystal display device for reducing power supply power consumption |
| CN110601316A (en) * | 2019-10-16 | 2019-12-20 | 上海广为美线电源电器有限公司 | Low-frequency charging circuit and charging equipment with double voltage input automatic switching functions |
| CN112087145A (en) * | 2020-09-07 | 2020-12-15 | 青岛鼎信通讯股份有限公司 | Isolation DC-DC circuit applied to electric power product |
-
2011
- 2011-10-20 CN CN201120401232XU patent/CN202455269U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106849688A (en) * | 2017-02-14 | 2017-06-13 | 深圳市华星光电技术有限公司 | A kind of circuit and liquid crystal display device for reducing power supply power consumption |
| CN110601316A (en) * | 2019-10-16 | 2019-12-20 | 上海广为美线电源电器有限公司 | Low-frequency charging circuit and charging equipment with double voltage input automatic switching functions |
| CN112087145A (en) * | 2020-09-07 | 2020-12-15 | 青岛鼎信通讯股份有限公司 | Isolation DC-DC circuit applied to electric power product |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120926 |
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| CX01 | Expiry of patent term |