CN201001089Y - Power supply device - Google Patents

Power supply device Download PDF

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Publication number
CN201001089Y
CN201001089Y CNU2006201600988U CN200620160098U CN201001089Y CN 201001089 Y CN201001089 Y CN 201001089Y CN U2006201600988 U CNU2006201600988 U CN U2006201600988U CN 200620160098 U CN200620160098 U CN 200620160098U CN 201001089 Y CN201001089 Y CN 201001089Y
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CN
China
Prior art keywords
transformer
former limit
circuit
winding
secondary winding
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CNU2006201600988U
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Chinese (zh)
Inventor
杨东平
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Individual
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Individual
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Publication date
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Priority to CNU2006201600988U priority Critical patent/CN201001089Y/en
Priority to PCT/CN2007/070851 priority patent/WO2008064594A1/en
Application granted granted Critical
Publication of CN201001089Y publication Critical patent/CN201001089Y/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33561—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having more than one ouput with independent control
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/4225—Arrangements for improving power factor of AC input using a non-isolated boost converter
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The utility model discloses a power device, which comprises a first transformer and a second transformer, wherein after the primary winding of the first transformer is connected in parallel with the primary winding of the second transformer, the input end is connected with the output end of a multi-switch transfer circuit, the first transformer comprises a primary winding and at least a secondary winding, at least a secondary winding is coupled with the primary winding; the second transformer comprises a primary winding and at least a secondary winding, the secondary winding is loosely coupled with the primary winding, the output of the secondary winding is connected with a capacitance, the secondary winding and the capacitance are formed an oscillating circuit to drive the load together. The power device the utility model provides can realize the two-way independent output, the power cost is decreased and the power consumption is reduced.

Description

A kind of supply unit
Technical field
The utility model relates to appliance field, the supply unit of a kind of two-way output that is specifically related to use in the electrical equipment.
Background technology
Liquid crystal indicator comprises backlight module and liquid crystal panel, and backlight module is used to described non-luminous liquid crystal panel own that light source is provided.No matter backlight module or liquid crystal panel, all needing power supply is its power supply.
Consult Fig. 1, application scenario at some liquid crystal indicator, in the application as the two-in-one power supply of LCD TV, except providing the high-voltage alternating driving power for the fluorescent tube in the backlight module, the low-voltage DC that also needs an isolation is provided is to the control in the liquid crystal panel and image processing circuit and power amplifier power supply, and this low-voltage dc power supply is called the control power supply.
Control power supply output 18～24V direct current is exported 12V to power amplifier among the figure, 5V, and the 5VSTB direct current is to control and image processing circuit.
After the AC rectification input, also must between rectification circuit and lamp tube drive circuit, add a circuit of power factor correction usually, so liquid crystal television power supply generally have three more powerful power circuits at least in addition.In these three power circuits, lamp tube drive circuit and circuit of power factor correction are single because of controlling object, the circuit standard of comparison; And the control power supply because the difference of subscriber line circuit, sequential difference, output voltage each is different and standard is the poorest, thereby be unfavorable for the unified and large-scale production of standard of liquid crystal indicator power supply.Described in addition three large power supply costs are also higher, and conversion efficiency is also poor.
The utility model content
The technical problems to be solved in the utility model provide the output of a kind of two-way, supply unit cheaply.
For solving the problems of the technologies described above, the purpose of this utility model is achieved through the following technical solutions:
A kind of supply unit, comprise first transformer and second transformer, the former limit winding of first transformer is in parallel with the former limit winding of second transformer, input termination after the former limit winding of described first transformer and the former limit winding parallel connection of second transformer exchanges, described first transformer comprises former limit winding and at least one secondary winding, described at least one secondary winding and former limit winding close-coupled; Described second transformer comprises former limit winding and at least one secondary winding, described secondary winding and former limit winding loose couplings, and described secondary winding output connects electric capacity, and described secondary winding and described electric capacity constitute oscillating circuit, drive load together.
Preferably, described at least one and the closely-coupled secondary winding of former limit winding quantity are two, and the serial connection diode, constitute full-wave rectifying circuit.
Preferably, described supply unit further is included as described transformer the many switch transformed circuits that exchange input is provided.
Preferably, described many switch transformed circuits are push-pull circuit topology, half-bridge circuit topology or full-bridge circuit topological circuit.
Preferably, further comprise circuit of power factor correction, its output high voltage direct current is to the input of described many switch transformed circuits.
Above technical scheme as can be seen, supply unit provided by the utility model comprises two transformers, the former limit winding of first transformer is in parallel with the former limit winding of second transformer, the former limit winding of first transformer and secondary winding close-coupled, its secondary winding can be used for powering to subscriber line circuit, the former limit winding of second transformer and secondary winding loose couplings, its secondary winding can be used for driving fluorescent tube.Compare the existing power supply technology, omitted more powerful control power supply, thereby reduced the cost of power supply.In addition, former limit winding and secondary winding close-coupled because of first transformer, the low-voltage dc voltage of its secondary winding rectification output and the control frequency of many switch transformed circuits are irrelevant, its stability depends on the stability of circuit of power factor correction output, but normal power supply is given power amplifier, to user's DC/DC circuit supply, provide control and needed various voltages of image processing circuit and sequential simultaneously.The output of the secondary winding of second transformer then directly is controlled by the control frequency of many switch transformed circuits, can change lamp tube current, thus control brightness.Two-way output can be distinguished independent control like this, is mutual decoupling zero.When many switch transformed circuits adopted the bridge circuit topology, owing to realized zero voltage switch, the switching loss of power tube effectively reduced.Like this, just realized the supply unit of a kind of low cost, the output of high efficiency two-way.
Description of drawings
Fig. 1 is the circuit theory diagrams of prior art liquid crystal television power supply device;
Fig. 2 is the schematic diagram of supply unit provided by the utility model;
Fig. 3 is the circuit diagram of supply unit provided by the utility model;
Fig. 4 is the closely-coupled generalized section of transformer provided by the utility model;
Fig. 5 is the loosely-coupled generalized section of transformer provided by the utility model;
Fig. 6 is the circuit diagram of embodiment provided by the utility model;
Fig. 7 is the circuit diagram of push-pull circuit provided by the utility model and transformer combination;
Fig. 8 is the circuit diagram of half-bridge circuit provided by the utility model and transformer combination;
Fig. 9 is the circuit diagram of quasi-semibridge circuit provided by the utility model and transformer combination;
Figure 10 is the circuit diagram of quasi-semibridge circuit provided by the utility model and transformer combination;
Figure 11 is the circuit diagram of full-bridge circuit provided by the utility model and transformer combination.
Embodiment
Fig. 2 is the schematic diagram of supply unit provided by the utility model, basic principle is: adopt two transformers in the lamp tube drive circuit, the output of relative set two-way, one, first transformer former limit winding and secondary winding close-coupled, its secondary winding output low-voltage DC is pressed onto power amplifier and control circuit, and its low-voltage dc voltage and switching frequency are irrelevant, and stability depends on the stable of circuit of power factor correction PFC output voltage; Its two, the second transformer former limit winding and secondary winding loose couplings, its secondary winding removes to drive fluorescent tube, can control lamp tube current by changing switching frequency.As long as a very low power standby power is set like this, just can omit the more powerful control power supply in the two-in-one power supply of prior art LCD TV shown in Figure 1.
Fig. 3 is the circuit diagram of supply unit provided by the utility model, this supply unit comprises the rectification circuit that gets access to grid, connect rectification circuit direct current output circuit of power factor correction, meet many switch transformed circuits, the transformer T of the output of circuit of power factor correction high voltage direct current 1Former limit winding and transformer T 2Former limit winding and connect many switch transformed circuits;
Described transformer T 1Comprise a former limit winding N 1With secondary winding N 2And N 2', secondary winding N 2And N 2' and former limit winding N 1Close-coupled, described former limit winding N 1Input connect many switches switched circuit and exchange output, secondary winding N 2And N 2' be connected in series diode respectively, constitute full-wave rectifying circuit, resistance R 1With capacitor C 1And the output of connection full-wave rectifying circuit;
Because transformer T 1Former limit winding N 1With secondary winding N 2And N 2' close-coupled, to former limit winding N 1With secondary winding N 2, N 1And N 2Between impedance very little, drive the transformer secondary winding N of other circuit 2Rectifier output voltage be:
V 2＝V 1×N 2/N 1
As seen N 2Rectifier output voltage V 2Only be decided by input voltage V 1With the no-load voltage ratio of transformer, irrelevant with switching frequency; Described input voltage V 1For connecing the output voltage of many switch transformed circuits; As seen from the above analysis, as long as V 1Stable, V 2Will stablize, in actual applications V 1Stationary value can be controlled in 5%, so V 2Stationary value also can be controlled in 5%, but normal power supply is given amplifying circuit, satisfies user's needs.
Described transformer T 2Comprise a former limit winding N 21With a secondary winding N 22, described former limit winding N 21Input connect many switches switched circuit and exchange output, secondary winding N 22With former limit winding N 21Loose couplings, fluorescent tube R LWith capacitor C 22Serial connection, last and capacitor C 21And connection secondary winding N 22
Because transformer T 2Limit, Central Plains winding N 21With secondary winding N 22Loose couplings, N 21And N 22Leakage inductance form described inductance L, with capacitor C 21And C 22Constitute resonant circuit, drive described fluorescent tube R L, pass through R LElectric current be the function of frequency, increase with frequency and reduce, thereby realize dimming function, therefore can control lamp current and brightness by the mode that changes frequency.
Consult Fig. 4, described secondary winding N 2With former limit winding N 1Close-coupled is meant secondary winding N 2With former limit winding N 1Be positioned at same concentric plan, N 2Be positioned at N 1Form the concentric circles sandwich structure between the winding.
Consult Fig. 5, described secondary winding N 22With former limit winding N 21Loose couplings is meant former limit winding N 21With secondary winding N 22Not in same concentric plan, and secondary winding N 22With former limit winding N 21Separate, form at least creepage distance greater than 6mm.
Many switching circuits can adopt push-pull circuit topology, full-bridge circuit topological circuit or half-bridge circuit topology, and below with the half-bridge circuit topology for example, with reference to Fig. 6, many switching circuits adopt half-bridge circuit topology, transformer T 1Former limit winding N 1With transformer T 2Former limit winding N 21And the output of connection half-bridge circuit; T 2The secondary winding voltage feeds back to frequency conversion control circuit and drive circuit, and drive circuit signal processing such as amplifies to the consequential signal of frequency conversion control circuit, and the output of drive circuit meets field effect transistor Q respectively 1Grid and field effect transistor Q 2Grid, Q 1Source electrode and Q 2Drain electrode connects, capacitor C 01With C 02Series connection, and C 01With Q 1Drain electrode connect C 02With Q 2Source electrode connect T 1Former limit winding and T 2The winding parallel connection of former limit, one termination Q 1Source electrode, another termination C 01With C 02The mid point that connects; Also can utilize fluorescent tube R LCurrent feedback to frequency conversion control circuit and drive circuit, do not influence realization of the present utility model.
Many switching circuits adopt push-pull circuits, with the circuit diagram of transformer combination as shown in Figure 7, switch S 1And S 2The variation of switching frequency can control fluorescent tube R LThe variation of electric current;
Many switching circuits adopt half-bridge circuits, with the circuit diagram of transformer combination as shown in Figure 8, switch S 1And S 2The variation of switching frequency can control fluorescent tube R LThe variation of electric current;
Many switching circuits adopt the quasi-semibridge circuit, with circuit diagram such as Fig. 9 or shown in Figure 10 of transformer combination, switch S 1And S 2The variation of switching frequency can control fluorescent tube R LThe variation of electric current;
Many switching circuits adopt full-bridge circuits, with the circuit diagram of transformer combination as shown in figure 11, switch S 1, S 2, S 3And S 4The variation of switching frequency can control fluorescent tube R LThe variation of electric current.
Below as can be seen, supply unit provided by the utility model needs two transformer T 1And T 2, be respectively applied for and drive fluorescent tube and subscriber line circuit, compare the existing power supply technology, omitted and be specifically designed to the high-power control power supply that drives subscriber line circuit, saved production cost.Power to cpu circuit as long as replenish a very low power standby power, can realize application and other similar application of the two-in-one power supply of LCD TV, cost greatly reduces, and power consumption effectively reduces.
Because the semi-bridge alternation circuit still is operated in the zero voltage switch state, so conversion efficiency is still very high, the efficient of whole supply unit also is improved.Because of T 1Former limit winding and secondary winding close-coupled, the low-voltage dc voltage of its secondary winding rectification output and the control frequency of many switch transformed circuits are irrelevant, its stability depends on the stability of circuit of power factor correction output, can satisfy customer requirements, its low-voltage dc voltage is designed in any one magnitude of voltage among 18～24V, can directly power to power amplifier.Can increase some simple DC/DC varying circuits get final product on user circuit board as for control and the needed various control voltages of image processing circuit, controlling voltage and sequential thereof so just can be by controlling and image processing circuit directly be controlled.
After adopting supply unit provided by the utility model, liquid crystal television power supply can directly provide by liquid crystal display screen manufacturer is supporting, have only a 5V standby voltage and start 18～24V voltage that export the back for user's interface, the user can save a large amount of time and efforts on power supply, and the cost of liquid crystal television power supply reduces greatly because of large-scale standardized production.After this transformer formed a whole as supply unit and liquid crystal display screen, the output of power supply can be normalized to a kind of voltage, is easy to the formation standard, was user-friendly to, thereby laid the foundation for producing in enormous quantities.
Except the application on liquid crystal television power supply, supply unit provided by the utility model also can be applied in similar occasion.
More than a kind of supply unit provided by the utility model is described in detail, used specific case herein principle of the present utility model and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present utility model and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present utility model, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model.

Claims (5)

1, a kind of supply unit, it is characterized in that: comprise first transformer and second transformer, the former limit winding of first transformer is in parallel with the former limit winding of second transformer, input termination after the former limit winding of described first transformer and the former limit winding parallel connection of second transformer exchanges, described first transformer comprises former limit winding and at least one secondary winding, described at least one secondary winding and former limit winding close-coupled; Described second transformer comprises former limit winding and at least one secondary winding, described secondary winding and former limit winding loose couplings, and described secondary winding output connects electric capacity, and described secondary winding and described electric capacity constitute oscillating circuit, drive load together.
2, supply unit according to claim 1 is characterized in that: described at least one and the closely-coupled secondary winding of former limit winding quantity are two, and the serial connection diode, constitute full-wave rectifying circuit.
3, supply unit according to claim 2 is characterized in that, further is included as described transformer the many switch transformed circuits that exchange input are provided.
4, supply unit according to claim 3 is characterized in that, described many switch transformed circuits are push-pull circuit topology, half-bridge circuit topology or full-bridge circuit topological circuit.
5, supply unit according to claim 3 is characterized in that, further comprises circuit of power factor correction, and its output high voltage direct current is to the input of described many switch transformed circuits.
CNU2006201600988U 2006-11-28 2006-11-28 Power supply device Expired - Fee Related CN201001089Y (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CNU2006201600988U CN201001089Y (en) 2006-11-28 2006-11-28 Power supply device
PCT/CN2007/070851 WO2008064594A1 (en) 2006-11-28 2007-10-09 A power supply device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNU2006201600988U CN201001089Y (en) 2006-11-28 2006-11-28 Power supply device

Publications (1)

Publication Number Publication Date
CN201001089Y true CN201001089Y (en) 2008-01-02

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CNU2006201600988U Expired - Fee Related CN201001089Y (en) 2006-11-28 2006-11-28 Power supply device

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WO (1) WO2008064594A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102013810A (en) * 2010-12-30 2011-04-13 南京航空航天大学 Double-circuit double-tube forward shock combined converter with output midpoint
CN102013809A (en) * 2010-12-30 2011-04-13 南京航空航天大学 Double-line double-tube normal shock direct current converter with transformer with two secondary sides
CN102056378A (en) * 2009-11-03 2011-05-11 英特赛尔美国股份有限公司 Led driver with open loop dimming control
CN103259992A (en) * 2013-04-01 2013-08-21 青岛海信电器股份有限公司 Stand-by power source circuit and stand-by method
CN116491057A (en) * 2020-11-23 2023-07-25 华为数字能源技术有限公司 Asymmetric impedance network for 3-port bi-directional isolated DC-DC converter

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4628426A (en) * 1985-10-31 1986-12-09 General Electric Company Dual output DC-DC converter with independently controllable output voltages
US6373722B1 (en) * 2000-06-05 2002-04-16 International Business Machines Corporation Power supply system for providing an auxiliary output voltage
DE20019056U1 (en) * 2000-11-09 2001-02-15 Power-One Ag, Uster DC-DC CONVERTER
JP4626338B2 (en) * 2005-02-25 2011-02-09 サンケン電気株式会社 DC converter

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102056378A (en) * 2009-11-03 2011-05-11 英特赛尔美国股份有限公司 Led driver with open loop dimming control
CN102056378B (en) * 2009-11-03 2014-11-26 英特赛尔美国股份有限公司 LED driver with open loop dimming control
CN102013810A (en) * 2010-12-30 2011-04-13 南京航空航天大学 Double-circuit double-tube forward shock combined converter with output midpoint
CN102013809A (en) * 2010-12-30 2011-04-13 南京航空航天大学 Double-line double-tube normal shock direct current converter with transformer with two secondary sides
CN103259992A (en) * 2013-04-01 2013-08-21 青岛海信电器股份有限公司 Stand-by power source circuit and stand-by method
CN103259992B (en) * 2013-04-01 2016-02-10 青岛海信电器股份有限公司 Standby power circuit and idle method
CN116491057A (en) * 2020-11-23 2023-07-25 华为数字能源技术有限公司 Asymmetric impedance network for 3-port bi-directional isolated DC-DC converter

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C14 Grant of patent or utility model
GR01 Patent grant
C17 Cessation of patent right
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20080102

Termination date: 20121128