CN102386766B - A kind of Switching Power Supply - Google Patents
A kind of Switching Power Supply Download PDFInfo
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- CN102386766B CN102386766B CN201010268919.0A CN201010268919A CN102386766B CN 102386766 B CN102386766 B CN 102386766B CN 201010268919 A CN201010268919 A CN 201010268919A CN 102386766 B CN102386766 B CN 102386766B
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- 238000005516 engineering process Methods 0.000 description 2
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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 invention discloses a kind of Switching Power Supply, comprise feedback control loop, described feedback control loop comprises: feedback resistance R1, R2, reference voltage stabilizing source, optocoupler and compensating circuit, it is characterized in that, described Switching Power Supply also comprises the voltage modulation circuit be connected in parallel with described feedback resistance R1, and this voltage modulation circuit comprises voltage modulated resistance R7 and state modulating part; Wherein, described voltage modulation circuit, when equipment is normal operating conditions residing for described Switching Power Supply, disconnects being connected in parallel of described voltage modulation circuit and described feedback resistance R1 by described state modulating part; When residing for described Switching Power Supply, equipment is holding state, by being connected in parallel of voltage modulation circuit described in the conducting of described state modulating part and described feedback resistance R1.Switching Power Supply provided by the invention, by the size of flexible adjustment feedback resistance, solves standby voltage that Switching Power Supply exports and standby required voltage difference greatly and then the problem of influential system efficiency.
Description
Technical field
The present invention relates to electronic information technical field, particularly relate to a kind of Switching Power Supply.
Background technology
In current LED television system, two parts must be comprised: Switching Power Supply and signal-processing board.In general design, require that TV has holding state, can normally be started by remote control or other control when holding state, this requires that Switching Power Supply inputs the constant direct current in normal situation Xia You mono-road at AC and exports, be designated as Vo1, require Vo1 energy continued power under television standby state, the control section (CPU) of inhibit signal disposable plates normally works.
In the system had, Vo1 should as standby power, again for other purposes, such as power amplifier etc., so Vo1 can be defined as 12V, by the power management of signal-processing board, Vo1 is converted into the more low-voltage (such as 3.3V) of standby needs, is designated as Vstb.
As shown in Figure 1, be the circuit diagram of feedback control loop in LED television Switching Power Supply in prior art, as shown in the figure, R1, R2 are feedback resistance, and N2 is a reference voltage stabilizing source, and N1 is optocoupler, and R9, R6, C2 and C1 form the compensating circuit in feedback control loop.
The output voltage Vo1 of this Switching Power Supply roughly determines have by the reference voltage (being designated as Vref) of N2 and the dividing potential drop of R1, R2:
When the change in voltage of Vo, be embodied in the curent change between the diode (1-2) in N1, in N1, the change of diode current causes the change of phototriode (4-3) electric current, cause the change of feedback transformer FB, by the duty ratio that the change detecting FB regulates transformer to drive, realize the stable output of Vo voltage.Namely realize loop by this feedback control loop to control, reach the object of stable Vo1, wherein the size of Vo1 can set by regulating R1 or R2.
At present, along with popularizing of LED television, the energy-saving and cost-reducing requirement of TV is improved constantly, higher requirement be it is also proposed for TV power problems in the standby state.As mentioned above, power required voltage Vstb much smaller than Vo1 under general television standby state, and be converted into the process of Vstb from Vo1 in signal-processing board and will bring more loss, that is, between holding state demand voltage Vstb and power supply effective supply voltage Vo1, pressure reduction is too large, the efficiency of influential system.
Summary of the invention
The invention provides a kind of switching power circuit, in order to solve standby voltage that the Switching Power Supply that exists in prior art exports and standby required voltage difference greatly and then the problem of influential system efficiency.
Concrete, the invention provides a kind of switching power circuit, comprise feedback control loop, described feedback control loop comprises: feedback resistance R1, R2, and reference voltage stabilizing source, optocoupler and compensating circuit, is characterized in that,
Described Switching Power Supply also comprises the voltage modulation circuit be connected in parallel with described feedback resistance R1, and this voltage modulation circuit comprises voltage modulated resistance R7 and state modulating part;
Described voltage modulation circuit, when equipment is normal operating conditions residing for described Switching Power Supply, disconnects being connected in parallel of described voltage modulation circuit and described feedback resistance R1 by described state modulating part; When residing for described Switching Power Supply, equipment is holding state, by being connected in parallel of voltage modulation circuit described in the conducting of described state modulating part and described feedback resistance R1.
Wherein, when residing for described Switching Power Supply, equipment is holding state, described switch power source output voltage is:
in formula
vref is the reference voltage value of described reference voltage stabilizing source.
Particularly, above-mentioned state modulating part is be connected on the switch in the shunt circuit that is made up of described feedback resistance R1 and described voltage modulation circuit.In the unlatching of this switch or the equipment residing for described Switching Power Supply of closedown, signal-processing board controls according to the state of described equipment.
Or,
Described state modulating part comprises: high/low level controling signal source, triode Q1 and triode Q2;
Described high/low level controling signal source, be connected with the base stage of described triode Q2, for exporting high-level control signal when equipment is normal operating conditions residing for described Switching Power Supply, the output low level control signal when equipment is holding state residing for described Switching Power Supply;
The base stage of described triode Q2 is connected with described high/low level controling signal source, grounded emitter, and collector electrode is connected with the base stage of voltage input end with described triode Q1 respectively;
The base stage of described triode Q1 is connected with the collector electrode of described voltage input end with described triode Q2 respectively, and the collector and emitter of described triode Q1 is arranged in the shunt circuit be made up of described feedback resistance R1 and described voltage modulated resistance R7.
Further, described state modulating part also comprises circuit protection resistance; Described circuit protection resistance is arranged between described high/low level controling signal source and the base stage of described triode Q2, and between the base stage being arranged in the collector electrode of described voltage input end and described triode Q2, triode Q1.
When high/low level controling signal source described in state modulating part of the present invention exports high-level control signal, described triode Q2 conducting, triode Q1 end, and make that described voltage modulation circuit and described feedback resistance R1's be connected in parallel disconnection;
When described in described state modulating part, high/low level controling signal source sends low level control signal, described triode Q2 ends, triode Q1 conducting, makes that described voltage modulation circuit and described feedback resistance R1's be connected in parallel conducting.
Wherein, described high/low level controling signal source exports high-level control signal or low level control signal, and in equipment residing for described Switching Power Supply, signal-processing board controls to export according to the state of described equipment.
Equipment residing for Switching Power Supply of the present invention is LED television.
Beneficial effect of the present invention is as follows:
Switching Power Supply provided by the invention, output voltage is Vo1 in normal operating conditions, meet the requirement of signal processing system, in the standby state, can adjust the value of voltage modulated resistance R7, the voltage Vo1 that Switching Power Supply is exported reduces, and final output voltage is the demand of other element in compatible system both, turn reduce and pressure reduction between Vstb, reduce the power consumption of system.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the circuit diagram of feedback control loop in prior art breaker in middle power supply;
Fig. 2 is the circuit structure diagram of a kind of Switching Power Supply provided by the invention;
The circuit structure diagram of a kind of Switching Power Supply that Fig. 3 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
In order to solve problems of the prior art, the invention provides a kind of Switching Power Supply, as shown in Figure 2, comprise: feedback control loop, described feedback control loop comprises: feedback resistance R1, R2, reference voltage stabilizing source N2, optocoupler N1 and compensating circuit, further, described Switching Power Supply also comprises the voltage modulation circuit be connected in parallel with described feedback resistance R1, and this voltage modulation circuit comprises voltage modulated resistance R7 and state modulating part;
Concrete, voltage modulation circuit when equipment residing for Switching Power Supply is normal operating conditions, by being connected in parallel of state modulating part off voltage modulation circuit and feedback resistance; When equipment residing for Switching Power Supply is holding state, by being connected in parallel of state modulating part conducting voltage modulation circuit and described feedback resistance.
Wherein, when residing for described Switching Power Supply, equipment is holding state, described switch power source output voltage is:
in formula
vref is the reference voltage value of reference voltage stabilizing source N2.
Switching Power Supply of the present invention in normal operating conditions output voltage is Vo1, meet the requirement of signal processing system, in the standby state, the value of voltage modulated resistance R7 can be adjusted, the voltage Vo1 that Switching Power Supply is exported reduces, final output voltage is the demand of other element in compatible system both, turn reduces and pressure reduction between Vstb, reduces the power consumption of system.
Provide the present invention's preferred embodiment according to Fig. 3 below, and combine the description to embodiment, provide ins and outs of the present invention further, the specific implementation process of the method provided of the present invention can be described better.
The embodiment of the present invention provides a kind of Switching Power Supply, this Switching Power Supply output voltage when normal work is Vo1, meet the requirement of signal processing system, output voltage is made to reduce as Vo2 in the standby state, make this magnitude of voltage both meet the requirement of system, the power consumption of system can be reduced again in the standby state.
As shown in Figure 3, be the structure chart of the Switching Power Supply that the embodiment of the present invention provides, this Switching Power Supply comprises feedback control loop and voltage modulation circuit;
Preferably, described voltage modulation circuit is primarily of voltage modulated resistance R7 and state modulating part composition, and wherein, state modulating part mainly comprises high/low level controling signal source POWER_ON, triode Q1 and triode Q2; Preferably, this state modulating part also comprises circuit protection resistance R3, R4 and R5.Wherein said "/" represents the implication of "or".
Wherein, high/low level controling signal source POWER_ON is used for exporting high level signal and low level signal respectively according to the normal operating conditions of LED television system and holding state; Preferably, this high/low level controling signal source is controlled to export according to the state of television system by the signal-processing board of LED television system.
Based on foregoing circuit structured flowchart, below the specific implementation process of Switching Power Supply adjustment Vo1 is described in detail:
When LED television is in normal operating conditions, POWER_ON exports high level, now triode Q2 saturation conduction, is dragged down by the collector voltage of triode Q2, and now, the voltage Vo of voltage input end input gets back to ground by R4, triode Q2; And now triode Q1 base voltage is low, triode Q1 ends, and R7 is equivalent to open circuit, and the voltage modulation circuit newly increased does not impact feedback control loop.Wherein, R4 resistance demand fulfillment triode Q2 saturation conduction and circuital current do not cause damage to other device;
When LED television is in holding state, POWER_ON output low level, now, triode Q2 base voltage is low, triode Q2 ends, the voltage Vo of voltage input end input is added to triode Q1 base stage by R4 and R3, and make triode Q1 saturation conduction, Vo voltage is by adding to the reference edge of reference voltage stabilizing source N2 after R1 and R7 parallel connection, i.e. 1 pin, now be equivalent to R1 and resistance R7, R1//R7 is designated as R1 ', now has:
in formula
vref is the reference voltage value of described reference voltage stabilizing source.
The present invention is exactly the change by feedback control loop resistance, and the output voltage under adjustment holding state, due to the voltage Vo2 < Vo1 after adjustment, makes the system power dissipation under holding state reduce.The value that wherein occurrence of Vo2 can change R7 adjusts, and then obtains the demand of other element in both compatible systems, turn reduces and pressure reduction between Vstb.
It should be noted that, realizing the Switching Power Supply adjustment that voltage exports in the standby state by above-mentioned voltage modulation circuit is only one preferably implementation, the present invention is not limited in this kind of implementation, such as, Switching Power Supply of the present invention is in parallel with the feedback resistance in feedback control loop after one switch and voltage modulated resistance R7 can also being connected, the open and close of its breaker in middle are controlled by the signal-processing board of LED television, be specially, signal-processing board is when LED electrical is considered as holding state, closing switch instruction is sent to switch, conducting R7 and R1 is connected in parallel, signal-processing board, when LED electrical is considered as normal operating conditions, sends to switch and opens switch command, disconnect being connected in parallel of R7 and R1.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (6)
1. a Switching Power Supply, comprises feedback control loop, and described feedback control loop comprises: feedback resistance R1, R2, and reference voltage stabilizing source, optocoupler and compensating circuit, is characterized in that,
Described Switching Power Supply also comprises the voltage modulation circuit be connected in parallel with described feedback resistance R1, and this voltage modulation circuit comprises voltage modulated resistance R7 and state modulating part; Described state modulating part comprises: high/low level controling signal source, triode Q1 and triode Q2;
Described high/low level controling signal source, be connected with the base stage of described triode Q2, for exporting high-level control signal when equipment is normal operating conditions residing for described Switching Power Supply, the output low level control signal when equipment is holding state residing for described Switching Power Supply;
The base stage of described triode Q2 is connected with described high/low level controling signal source, grounded emitter, and collector electrode is connected with the base stage of voltage input end with described triode Q1 respectively;
The base stage of described triode Q1 is connected with the collector electrode of described voltage input end with described triode Q2 respectively, and the collector and emitter of described triode Q1 is arranged in the shunt circuit be made up of described feedback resistance R1 and described voltage modulated resistance R7;
Described voltage modulation circuit, when equipment is normal operating conditions residing for described Switching Power Supply, disconnects being connected in parallel of described voltage modulation circuit and described feedback resistance R1 by described state modulating part; When residing for described Switching Power Supply, equipment is holding state, by being connected in parallel of voltage modulation circuit described in the conducting of described state modulating part and described feedback resistance R1;
Wherein, when residing for described Switching Power Supply, equipment is holding state, described switch power source output voltage is:
in formula
vref is the reference voltage value of described reference voltage stabilizing source.
2. Switching Power Supply as claimed in claim 1, it is characterized in that, described state modulating part also comprises circuit protection resistance; Described circuit protection resistance is arranged between described high/low level controling signal source and the base stage of described triode Q2, and between the base stage being arranged in the collector electrode of described voltage input end and described triode Q2, triode Q1.
3. Switching Power Supply as claimed in claim 2, is characterized in that,
When high/low level controling signal source described in described state modulating part exports high-level control signal, described triode Q2 conducting, triode Q1 end, and make that described voltage modulation circuit and described feedback resistance R1's be connected in parallel disconnection;
When described in described state modulating part, high/low level controling signal source sends low level control signal, described triode Q2 ends, triode Q1 conducting, makes that described voltage modulation circuit and described feedback resistance R1's be connected in parallel conducting.
4. Switching Power Supply as claimed in claim 1, is characterized in that, described high/low level controling signal source exports high-level control signal or low level control signal, and in equipment residing for described Switching Power Supply, signal-processing board controls to export according to the state of described equipment.
5. Switching Power Supply as claimed in claim 2 or claim 3, it is characterized in that, described high/low level controling signal source exports high-level control signal or low level control signal, and in equipment residing for described Switching Power Supply, signal-processing board controls to export according to the state of described equipment.
6. Switching Power Supply as claimed in claim 1, it is characterized in that, equipment residing for described Switching Power Supply is LED television.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010268919.0A CN102386766B (en) | 2010-09-01 | 2010-09-01 | A kind of Switching Power Supply |
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| CN201010268919.0A CN102386766B (en) | 2010-09-01 | 2010-09-01 | A kind of Switching Power Supply |
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| CN102386766B true CN102386766B (en) | 2016-03-16 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103051232B (en) * | 2012-12-07 | 2015-10-21 | 京东方科技集团股份有限公司 | A kind of inverter and display unit |
| CN105322587B (en) * | 2014-07-28 | 2019-02-26 | 神讯电脑(昆山)有限公司 | Mobile electric power device and its current output method |
| EP3068025B1 (en) | 2015-03-10 | 2018-09-19 | Nxp B.V. | Switch mode power supplies, control arrangements therefor and methods of operating thereof |
| CN112865491A (en) * | 2021-01-07 | 2021-05-28 | 珠海格力电器股份有限公司 | Switching power supply capable of reducing standby power consumption |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2824470Y (en) * | 2005-09-30 | 2006-10-04 | 海信集团有限公司 | Power output voltage regulating circuit and television with same |
| CN201491155U (en) * | 2009-06-25 | 2010-05-26 | 青岛海信电器股份有限公司 | Power supply circuit and television with same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2005341709A (en) * | 2004-05-27 | 2005-12-08 | Shihen Tech Corp | Power supply unit |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2824470Y (en) * | 2005-09-30 | 2006-10-04 | 海信集团有限公司 | Power output voltage regulating circuit and television with same |
| CN201491155U (en) * | 2009-06-25 | 2010-05-26 | 青岛海信电器股份有限公司 | Power supply circuit and television with same |
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