CN204733079U - A kind of power amplifier power supply circuits and TV power panel - Google Patents
A kind of power amplifier power supply circuits and TV power panel Download PDFInfo
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- CN204733079U CN204733079U CN201520428574.9U CN201520428574U CN204733079U CN 204733079 U CN204733079 U CN 204733079U CN 201520428574 U CN201520428574 U CN 201520428574U CN 204733079 U CN204733079 U CN 204733079U
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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
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The utility model is applicable to field of power supplies, provide a kind of power amplifier power supply circuits and TV power panel, this circuit and isolation drive and resonant circuit and LED-backlit controls and output circuit is of coupled connections, comprising: from isolation drive and resonant circuit with LED-backlit controls and obtain the alternation sensing unit of alternating current the common transformer of output circuit; Rectification unit, first, second input of rectification unit is connected with first, second output of alternation sensing unit respectively; Energy-storage units, the input of energy-storage units is connected with the output of rectification unit, and the output of energy-storage units provides electric energy to load.It is that power amplifier is powered that the utility model extracts winding from the transformer of LED backlight control circuit, due to resonant circuit, to export reverse spike little, therefore can select withstand voltage lower rectifier diode, reduce the capacity of filter capacitor, save switching tube simultaneously, ensureing high efficiency while, effectively reduce cost, improve reliability.
Description
Technical field
The utility model belongs to field of power supplies, particularly relates to a kind of power amplifier power supply circuits and TV power panel.
Background technology
Existing 24V TV (television, TV) power panel power amplifier power supply circuits mainly go out to export through over commutation filtering after a winding by flyback is secondary, although the flyback that many group voltage exports is most effective can reach about 82%, but overall line architecture is too complicated, and design cost is high.
In addition, in order to coordinate the energy saving requirement of present society, when giving main board power supply, TV power panel needs to export with switching circuit shuts down to reduce standby power in the standby state, therefore need the metal-oxide-semiconductor selecting resistance to very high surge currents, but not only cost is high to select high pressure resistant metal-oxide-semiconductor, and still exists when multiple switching machine owing to impacting the risk causing device failure, reliability is poor, cannot meet the current market demand.
Utility model content
The object of the utility model embodiment is to provide a kind of power amplifier power supply circuits, and be intended to solve existing power supply plate power amplifier power supply circuits efficiency low, cost is high, the problem of poor reliability.
The utility model embodiment is achieved in that a kind of power amplifier power supply circuits, and with isolation drive and resonant circuit with LED-backlit controls and output circuit is of coupled connections, described power amplifier power supply circuits comprise:
From isolation drive and resonant circuit and LED-backlit control and output circuit common transformer obtain the alternation sensing unit of alternating current;
By the rectification unit of described AC rectification, the first input end of described rectification unit, the second input are connected with the first output of described alternation sensing unit, the second output respectively;
Utilize the energy-storage units of alternating current charging, the input of described energy-storage units is connected with the output of described rectification unit, and the output of described energy-storage units provides electric energy to load.
Further, described alternation sensing unit comprises:
First winding and the second winding;
Described first winding and described isolation drive and resonant circuit and described LED-backlit controls and the magnetic core sharing a transformer of output circuit, the Same Name of Ends of described first winding is the first output of described alternation sensing unit, the different name end ground connection of described first winding;
Described second winding and described isolation drive and resonant circuit and described LED-backlit controls and the magnetic core sharing a transformer of output circuit, the Same Name of Ends of described second winding is the second output of described alternation sensing unit, the different name end ground connection of described second winding.
Further, described rectification unit comprises:
Diode D2 and diode D3;
The anode of described diode D2 is the first input end of described rectification unit, and the negative electrode of described diode D2 is that the output of described rectification unit is connected with the negative electrode of described diode D3, and the anode of described diode D3 is the second input of described rectification unit.
Further, described energy-storage units is electric capacity C1, and one end of described electric capacity C1 is the output of described energy-storage units, the other end ground connection of described electric capacity C1.
Further, described power amplifier power supply circuits also comprise resistance R3, and one end of described resistance R3 is connected with the output of described energy-storage units, the other end ground connection of described resistance R3.
Further, described power amplifier power supply circuits also comprise electric capacity C2, and one end of described electric capacity C2 is connected with the output of described energy-storage units, the other end ground connection of described electric capacity C2.
Further, described power amplifier power supply circuits also comprise an interface, and described interface is connected with the output of described energy-storage units.
Another object of the utility model embodiment is, provides a kind of TV power panel adopting above-mentioned power amplifier power supply circuits.
The utility model embodiment is taken out a winding and is powered to power amplifier in the transformer LED-backlit control and output circuit, due to resonant circuit, to export reverse spike little, therefore rectifier diode can select withstand voltage lower pipe, and the capacity of filter capacitor can be reduced, save switching over metal-oxide-semiconductor simultaneously, ensureing high efficiency while, effectively reduce cost, improve reliability.
Accompanying drawing explanation
The structure chart of the power amplifier power supply circuits that Fig. 1 provides for the utility model embodiment;
The exemplary circuit structure chart of the power amplifier power supply circuits that Fig. 2 provides for the utility model embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.In addition, if below in described each execution mode of the utility model involved technical characteristic do not form conflict each other and just can mutually combine.
It is that power amplifier is powered that the utility model embodiment extracts winding from the transformer of LED backlight control circuit, due to resonant circuit, to export reverse spike little, therefore can select withstand voltage lower rectifier diode, reduce the capacity of filter capacitor, save switching tube simultaneously, ensureing high efficiency while, effectively reduce cost, improve reliability.
Current large-sized TV power panel Shi Fenliangge department composition, one is that two is power to backlight LED to mainboard and T-CON plate power pack.
Backlight LED powers because power is large, so be all adopt resonance architectural schemes substantially, efficient and circuit simple, but waste resource a little to separately backlight power supply, therefore the utility model embodiment is taken out a winding and is powered to power amplifier in transformer backlight resonant circuit.
Below in conjunction with specific embodiment, realization of the present utility model is described in detail:
Fig. 1 shows the structure of the power amplifier power supply circuits that the utility model embodiment provides, and for convenience of explanation, illustrate only the part relevant to the utility model.
As the utility model one embodiment, these power amplifier power supply circuits 1 are with isolation drive and resonant circuit 2 and LED-backlit controls and output circuit 3 is of coupled connections,
These power amplifier power supply circuits 1 comprise:
Alternation sensing unit 11, for obtaining alternating current in the common transformer T2 from isolation drive and resonant circuit 2 and LED-backlit control and output circuit 3;
Rectification unit 12, for by AC rectification, the first input end of rectification unit 12, the second input are connected with the first output of alternation sensing unit 11, the second output respectively;
Energy-storage units 13, for utilizing alternating current charging, the input of energy-storage units 13 is connected with the output of rectification unit 12, and the output of energy-storage units 13 provides (+24V) electric energy to load.
The utility model embodiment is taken out a winding and is powered to power amplifier in the transformer T2 LED-backlit control and output circuit 3, owing to being resonant circuit, export reverse spike little, therefore rectifier diode D2, D3 can select the pipe of withstand voltage 150V, and the capacity of filter capacitor C1, C2 also can reduce, Simultaneous Switching switches metal-oxide-semiconductor and also can save, and effectively reduces cost.
Can expect, the utility model embodiment can also adopt Flyback configuration to realize, if take Flyback configuration rectifier diode need select the pipe of withstand voltage 400V.
Because the embodiment of the present invention adopts half-bridge resonance framework, therefore efficiency can reach more than 93%, in one-period diode D2 (upper half), diode D3 (lower half) in turn conducting be that electric capacity C1 charges, and corresponding circuit of reversed excitation can only one-period work half ripple.
Fig. 2 shows the exemplary circuit structure of the power amplifier power supply circuits that the utility model embodiment provides, and for convenience of explanation, illustrate only the part relevant to the utility model.
Isolation drive and resonant circuit 2 form elementary overall architecture by switching tube Q1, switching tube Q4, the second transformer T2, electric capacity C8, and be aided with some resistance R1, R2, R4-R13, electric capacity C3, C4 realize, wherein T1 is isolation drive transformer, drive singal, by secondary generation, is coupled to through transformer T1 and elementaryly removes driving switch pipe Q1, switching tube Q4.
LED-backlit controls and output circuit 3 realizes controlling primarily of process chip U1 (BD9211F), and include the generation of drive singal, control and the LED of LED current voltage open the functions such as short-circuit protection.
As the utility model one embodiment, this alternation sensing unit 11 comprises:
First winding 1A and the second winding 2A;
First winding 1A and isolation drive and resonant circuit 2 and LED-backlit controls and the magnetic core sharing a transformer T2 of output circuit 3, the Same Name of Ends of the first winding 1A is the first output of alternation sensing unit 11, the different name end ground connection of the first winding 1A;
Second winding 2A and isolation drive and resonant circuit 2 and LED-backlit controls and the magnetic core sharing a transformer T2 of output circuit 3, the Same Name of Ends of the second winding 2A is the second output of alternation sensing unit 11, the different name end ground connection of the second winding 2A.
As the utility model one embodiment, this rectification unit 12 comprises:
Diode D2 and diode D3;
The anode of diode D2 is the first input end of rectification unit 12, and the negative electrode of diode D2 is that the output of rectification unit 12 is connected with the negative electrode of diode D3, and the anode of diode D3 is the second input of rectification unit 12.
As the utility model one embodiment, this energy-storage units 13 is electric capacity C1, and one end of electric capacity C1 is the output of energy-storage units 13, the other end ground connection of electric capacity C1.
Preferably, these power amplifier power supply circuits 1 also comprise resistance R3, and one end of resistance R3 is connected with the output of energy-storage units 13, the other end ground connection of resistance R3.
Preferably, these power amplifier power supply circuits 1 also comprise electric capacity C2, and one end of electric capacity C2 is connected with the output of energy-storage units 13, the other end ground connection of electric capacity C2.
Preferably, these power amplifier power supply circuits 1 also comprise an interface JP1, and this interface JP1 is connected with the output of energy-storage units 13.
The operation principle of power amplifier power supply circuits 1 is as follows:
When the switching tube Q1 conducting in isolation drive and resonant circuit 2, switching tube Q2 ends, electric current flows to transformer T2 through switching tube Q1, for resonant capacitance C8 charges, winding 1A can produce corresponding AC energy simultaneously, through diode D2 rectification, charge to electric capacity C1, electric capacity C1 provide energy to load;
When the switching tube Q1 in isolation drive and resonant circuit 2 ends, switching tube Q2 conducting, the electric energy that electric capacity C8 stores is through the armature winding of transformer T2, discharge over the ground through switching tube Q2 again, simultaneously winding 2A can produce corresponding electric energy and charges to electric capacity C1 through diode D3 rectification, the magnitude of voltage now exported is obtained by the turn ratio of control transformer T2, and the fluctuation of output voltage can control in the scope of 10%.
Resistance R3 is dummy load, to electric capacity C1 discharging function when can play stable output and shut down.
Another object of the utility model embodiment is, provides a kind of TV power panel adopting above-mentioned power amplifier power supply circuits.
The utility model embodiment is taken out a winding and is powered to power amplifier in the transformer T2 LED-backlit control and output circuit 3, owing to being resonant circuit, export reverse spike little, therefore rectifier diode can select the pipe of withstand voltage 150V, and the capacity of filter capacitor can be reduced, save switching over metal-oxide-semiconductor simultaneously, ensureing high efficiency while, effectively reduce cost, improve reliability.
These are only preferred embodiment of the present utility model, not in order to limit the utility model, all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection range of the present utility model.
Claims (8)
1. power amplifier power supply circuits, with isolation drive and resonant circuit with LED-backlit controls and output circuit is of coupled connections, it is characterized in that, described power amplifier power supply circuits comprise:
From isolation drive and resonant circuit and LED-backlit control and output circuit common transformer obtain the alternation sensing unit of alternating current;
By the rectification unit of described AC rectification, the first input end of described rectification unit, the second input are connected with the first output of described alternation sensing unit, the second output respectively;
Utilize the energy-storage units of alternating current charging, the input of described energy-storage units is connected with the output of described rectification unit, and the output of described energy-storage units provides electric energy to load.
2. power amplifier power supply circuits as claimed in claim 1, it is characterized in that, described alternation sensing unit comprises:
First winding and the second winding;
Described first winding and described isolation drive and resonant circuit and described LED-backlit controls and the magnetic core sharing a transformer of output circuit, the Same Name of Ends of described first winding is the first output of described alternation sensing unit, the different name end ground connection of described first winding;
Described second winding and described isolation drive and resonant circuit and described LED-backlit controls and the magnetic core sharing a transformer of output circuit, the Same Name of Ends of described second winding is the second output of described alternation sensing unit, the different name end ground connection of described second winding.
3. power amplifier power supply circuits as claimed in claim 1, it is characterized in that, described rectification unit comprises:
Diode D2 and diode D3;
The anode of described diode D2 is the first input end of described rectification unit, and the negative electrode of described diode D2 is that the output of described rectification unit is connected with the negative electrode of described diode D3, and the anode of described diode D3 is the second input of described rectification unit.
4. power amplifier power supply circuits as claimed in claim 1, it is characterized in that, described energy-storage units is electric capacity C1, and one end of described electric capacity C1 is the output of described energy-storage units, the other end ground connection of described electric capacity C1.
5. power amplifier power supply circuits as claimed in claim 1, it is characterized in that, described power amplifier power supply circuits also comprise resistance R3, and one end of described resistance R3 is connected with the output of described energy-storage units, the other end ground connection of described resistance R3.
6. power amplifier power supply circuits as claimed in claim 1, it is characterized in that, described power amplifier power supply circuits also comprise electric capacity C2, and one end of described electric capacity C2 is connected with the output of described energy-storage units, the other end ground connection of described electric capacity C2.
7. power amplifier power supply circuits as claimed in claim 1, it is characterized in that, described power amplifier power supply circuits also comprise an interface, and described interface is connected with the output of described energy-storage units.
8. a TV power panel, is characterized in that, described TV power panel comprises the power amplifier power supply circuits as described in any one of claim 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520428574.9U CN204733079U (en) | 2015-06-19 | 2015-06-19 | A kind of power amplifier power supply circuits and TV power panel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520428574.9U CN204733079U (en) | 2015-06-19 | 2015-06-19 | A kind of power amplifier power supply circuits and TV power panel |
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| CN204733079U true CN204733079U (en) | 2015-10-28 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105281577A (en) * | 2015-06-19 | 2016-01-27 | 惠科电子（深圳）有限公司 | Power amplifier power supply circuit and TV power strip |
| CN107395022A (en) * | 2017-07-25 | 2017-11-24 | 杭州士兰微电子股份有限公司 | Mode of resonance switch converters and its control method |
| CN109935214A (en) * | 2019-04-24 | 2019-06-25 | 合肥惠科金扬科技有限公司 | A kind of backlight drive circuit and backlight drive device |
-
2015
- 2015-06-19 CN CN201520428574.9U patent/CN204733079U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105281577A (en) * | 2015-06-19 | 2016-01-27 | 惠科电子（深圳）有限公司 | Power amplifier power supply circuit and TV power strip |
| CN107395022A (en) * | 2017-07-25 | 2017-11-24 | 杭州士兰微电子股份有限公司 | Mode of resonance switch converters and its control method |
| CN107395022B (en) * | 2017-07-25 | 2023-08-08 | 杭州士兰微电子股份有限公司 | Resonant switching converter and control method thereof |
| CN109935214A (en) * | 2019-04-24 | 2019-06-25 | 合肥惠科金扬科技有限公司 | A kind of backlight drive circuit and backlight drive device |
| CN109935214B (en) * | 2019-04-24 | 2023-10-20 | 合肥惠科金扬科技有限公司 | Backlight driving circuit and backlight driving device |
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| C14 | Grant of patent or utility model | ||
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| CP01 | Change in the name or title of a patent holder |
Address after: 518000 Guangdong city of Shenzhen province Baoan District Shiyan street water Tamura Private Industrial Park Industrial Park, building 1 HKC 2, 3 Patentee after: Aucan Limited by Share Ltd Address before: 518000 Guangdong city of Shenzhen province Baoan District Shiyan street water Tamura Private Industrial Park Industrial Park, building 1 HKC 2, 3 Patentee before: HKC Electronic (Shenzhen) Co., Ltd. |