WO2008064594A1 - Dispositif d'alimentation - Google Patents

Dispositif d'alimentation Download PDF

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Publication number
WO2008064594A1
WO2008064594A1 PCT/CN2007/070851 CN2007070851W WO2008064594A1 WO 2008064594 A1 WO2008064594 A1 WO 2008064594A1 CN 2007070851 W CN2007070851 W CN 2007070851W WO 2008064594 A1 WO2008064594 A1 WO 2008064594A1
Authority
WO
WIPO (PCT)
Prior art keywords
transformer
secondary winding
primary winding
circuit
winding
Prior art date
Application number
PCT/CN2007/070851
Other languages
English (en)
Chinese (zh)
Inventor
Dongping Yang
Original Assignee
Dongping Yang
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Dongping Yang filed Critical Dongping Yang
Publication of WO2008064594A1 publication Critical patent/WO2008064594A1/fr

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Classifications

    • 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

Definitions

  • the utility model relates to the field of electrical appliances, in particular to a two-output power supply device used in an electric appliance.
  • the liquid crystal display device includes a backlight module and a liquid crystal panel, and the backlight module is configured to provide a light source for the liquid crystal panel that does not emit light by itself. Regardless of the backlight module or the LCD panel, power is required to supply it.
  • liquid crystal display devices such as LCD TV two-in-one power supply applications
  • LCD TV two-in-one power supply applications in addition to providing high-voltage AC drive power for the lamps in the backlight module, it is also necessary to provide an isolated low-voltage DC power supply to the LCD.
  • the control and image processing circuits in the panel and the power amplifier circuit are powered.
  • the low voltage DC power supply is called a control power supply.
  • control power supply outputs 18 ⁇ 24V DC to the power amplifier circuit, and outputs 12V, 5V, 5VSTB DC to the control and image processing circuits.
  • the LCD TV power supply generally has at least three power circuits with larger power.
  • the lamp driving circuit and the power factor correction circuit have a single control circuit and the circuit is relatively standard; and the control power supply has the worst standard because of different user circuits, different timings, and different output voltages, thus not Conducive to standardization and mass production of power supply for liquid crystal display devices.
  • the three high-power power sources are also high in cost and the conversion efficiency is also poor.
  • the technical problem to be solved by the present invention is to provide a two-output, low-cost power supply device.
  • the utility model relates to a power supply device, which comprises a first transformer and a second transformer.
  • the primary winding of the first transformer is connected in parallel with the primary winding of the second transformer, and the primary winding and the second transformer of the first transformer
  • the input terminal of the primary winding of the voltage device is connected in parallel with the alternating current;
  • the first transformer includes a primary winding and at least one secondary winding, the at least one secondary winding and the primary winding are tightly coupled;
  • the second transformer includes a primary winding and a secondary winding, the secondary winding and the primary winding are loosely coupled, the secondary winding output is connected to a capacitor, and the secondary winding and the capacitor form an oscillating circuit and are driven together load.
  • the at least one secondary winding has a number of secondary windings that are tightly coupled to the primary winding, and is diode-connected to form a full-wave rectifier circuit.
  • the power supply unit further includes a multi-switch conversion circuit that provides an AC input to the transformer.
  • the multi-switch conversion circuit is a push-pull circuit topology, a half-bridge circuit topology or a full-bridge circuit topology circuit.
  • a power factor correction circuit that outputs a high voltage direct current to the input of said multi-switch conversion circuit.
  • the at least one secondary winding is closely coupled to the primary winding, wherein the secondary winding and the primary winding are located in the same concentric plane, and the secondary winding is located between the primary windings to form a concentric circular sandwich structure;
  • the decoupling of the secondary winding from the primary winding means that the primary winding and the secondary winding are not in the same concentric plane, and the secondary winding is spaced apart from the primary winding to form a creepage distance of at least greater than 6 mm.
  • the power supply device provided by the utility model comprises two transformers, the primary winding of the first transformer is connected in parallel with the primary winding of the second transformer, and the primary winding and the secondary winding of the first transformer are tightly coupled.
  • the secondary winding can be used to supply power to the user circuit; the primary winding and the secondary winding of the second transformer are loosely coupled, and the secondary winding can be used to drive the lamp.
  • the power supply of the larger power is omitted, thereby reducing the cost of the power supply.
  • the low voltage DC voltage of the secondary winding rectified output is independent of the control frequency of the multi-switching conversion circuit, and its stability depends on the stability of the output of the power factor correction circuit. It can supply power to the power amplifier circuit and supply power to the user's DC/DC circuit, providing various voltages and timings required for control and image processing circuits.
  • the second transformer The output of the side winding is directly controlled by the control frequency of the multi-switching conversion circuit, and the current of the lamp can be changed to control the brightness.
  • the two outputs can be independently controlled and decoupled from each other.
  • the multi-switching conversion circuit uses the bridge circuit topology, since the zero voltage switching is realized, the switching loss of the power tube is effectively reduced. In this way, a low-cost, high-efficiency two-output power supply unit is realized.
  • FIG. 1 is a circuit schematic diagram of a power supply device of a prior art liquid crystal television
  • FIG. 2 is a schematic diagram of a power supply device provided by the present invention.
  • FIG. 3 is a circuit diagram of a power supply device provided by the present invention.
  • Figure 4 is a schematic cross-sectional view showing the tight coupling of the transformer provided by the present invention.
  • Figure 5 is a schematic cross-sectional view showing the loose coupling of the transformer provided by the present invention.
  • Figure 6 is a circuit diagram of an embodiment of the present invention.
  • FIG. 7 is a circuit diagram of a combination of a push-pull circuit and a transformer provided by the present invention.
  • FIG. 8 is a circuit diagram of a combination of a half bridge circuit and a transformer provided by the present invention.
  • FIG. 9 is a circuit diagram of a quasi-half bridge circuit and a transformer combination provided by the present invention.
  • FIG. 10 is a circuit diagram of a quasi-half bridge circuit and a transformer combination provided by the present invention
  • FIG. 11 is a circuit diagram of a full bridge circuit and a transformer combination provided by the present invention.
  • FIG. 2 is a schematic diagram of a power supply device provided by the present invention, wherein: two transformers are used in the lamp driving circuit, and two outputs are correspondingly arranged.
  • the primary winding of the first transformer is tightly coupled with the secondary winding.
  • the secondary winding outputs a low-voltage DC voltage to the power amplifier and the control circuit, and the low-voltage DC voltage is independent of the switching frequency, and the stability depends on the stability of the power factor correction circuit PFC output voltage;
  • the second transformer primary winding and the secondary winding ⁇ Dispersion its secondary winding drives the lamp, and the lamp current can be controlled by changing the switching frequency.
  • the control power of the larger power in the two-in-one power supply of the prior art LCD TV shown in Fig. 1 can be omitted.
  • the power supply device includes a rectifier circuit connected to the power grid, a power factor correction circuit connected to the DC output of the rectifier circuit, a multi-switch conversion circuit connected to the power factor correction circuit, and a high-voltage DC output, and a transformer.
  • the primary winding of ⁇ and the primary winding of transformer ⁇ 2 are connected to a multi-switch conversion circuit;
  • the transformer ⁇ includes a primary winding and a secondary winding N 2 and ⁇ 2 ', and the secondary windings ⁇ 2 and ⁇ 2 ' are tightly coupled to the primary winding, and the input of the primary winding is connected to a multi-switch switching circuit.
  • the secondary windings N 2 and ⁇ 2 ' are respectively connected in series with the diode D o D 2 to form a full-wave rectifier circuit, and the resistor and the capacitor d are coupled to the output of the full-wave rectifier circuit;
  • the impedance between the primary winding and the secondary winding N 2 is small, and the rectified output voltage of the transformer secondary winding N 2 driving the other circuits is:
  • the rectified output voltage of the secondary winding ⁇ 2 is only determined by the input voltage and the transformer ratio, independent of the switching frequency; the input voltage is the output voltage of the multi-switch conversion circuit; as can be seen from the above analysis, as long as it is stable, It will be stable. In practical applications, the stable value can be controlled within 5%, so the stable value can be controlled within 5%, and the power can be normally supplied to the amplifier circuit to meet the needs of users.
  • the transformer ⁇ 2 includes a primary winding ⁇ 21 and a secondary winding ⁇ 22 , the input of the primary winding ⁇ 21 is connected to the AC output of the multi-switch switching circuit, and the secondary winding ⁇ 22 is loosely coupled to the primary winding ⁇ 21 , the capacitor C 22 in series with the lamp, and finally the capacitor C 21 is coupled a secondary winding N 22.
  • the driving The lamp R L Since the transformer winding T 2 Central v 21 v 22 and the loose coupling secondary winding, the primary winding and the secondary winding 21 v v 22 forming the leakage inductance of the inductor L, the capacitor 21 billion and 22 billion form a resonance circuit, the driving The lamp R L , the current passing through the lamp R L is a function of frequency, and decreases with increasing frequency, thereby realizing the dimming function, so that the lamp current and brightness can be controlled by changing the frequency.
  • the secondary winding N 2 is tightly coupled to the primary winding, which means that the secondary winding N 2 and the primary winding are located in the same concentric plane, and the secondary winding N 2 is located between the primary windings to form a concentric circle. Sandwich structure.
  • the loose coupling of the secondary winding N 22 with the primary winding N 21 means that the primary winding N 21 and the secondary winding N 22 are not in the same concentric plane, and the secondary winding N 22 and the primary winding The N 21 is spaced apart to form a creepage giant that is at least greater than 6 mm.
  • the multi-switch circuit can use the push-pull circuit topology, the full-bridge circuit topology circuit or the half-bridge circuit topology.
  • the multi-switch circuit uses a push-pull circuit, and the circuit diagram combined with the transformer is shown in Figure 7.
  • the change of the switching frequency of the switches Si and S 2 can control the change of the lamp R L current;
  • the multi-switch circuit uses a half-bridge circuit, and the circuit diagram combined with the transformer is shown in Fig. 8.
  • the change of the switching frequency of the switches Si and S 2 can control the change of the lamp R L current;
  • the multi-switch circuit uses a quasi-half bridge circuit, and the circuit diagram combined with the transformer is shown in FIG. 9 or FIG. 10, and the change of the switching frequency of the switch and S 2 can control the change of the lamp R L current;
  • the multi-switch circuit uses a full-bridge circuit.
  • the circuit diagram combined with the transformer is shown in Fig. 11.
  • the change of the switching frequency of the switches s 1 S 2 , S 3 and S 4 can control the change of the lamp RL current.
  • the power supply device requires two transformers 1 ⁇ and ⁇ 2 for respectively driving the lamp tube and the user circuit, and omitting a large dedicated for driving the user circuit compared to the existing power supply technology.
  • Power control power supply saves production costs.
  • the utility model only needs to supplement a small power standby power supply to supply power to the CPU circuit, thereby realizing the application of the liquid crystal television two-in-one power supply and the like, and the cost is greatly reduced, and the power consumption is effectively reduced.
  • the half-bridge conversion circuit Since the half-bridge conversion circuit is still operating in the zero voltage switching state, the conversion efficiency is still high, and the efficiency of the entire power supply device is also improved. Because the primary winding and the secondary winding of the transformer ⁇ are tightly coupled, the low-voltage DC voltage of the secondary winding rectified output is independent of the control frequency of the multi-switching conversion circuit, and its stability depends on the stability of the output of the power factor correction circuit. To meet user requirements, its low-voltage DC voltage is designed to be any voltage between 18-24V, which can directly supply power to the power amplifier circuit. As for the various control voltages required for control and image processing circuits, it can be added to the user circuit board. Add some simple DC/DC change circuits so that the control voltage and its timing can be directly controlled by the control and image processing circuits.
  • the liquid crystal television power supply can be directly provided by the liquid crystal panel manufacturer, and the user interface has only one 5V standby voltage and 18 24V voltage output after startup, and the user can save a large amount of power on the power supply. Time and effort, and the cost of LCD TV power supplies is greatly reduced due to large-scale standardized production.
  • the output of the power supply can be normalized into a voltage, which is easy to form a standard and is convenient for the user to use, thereby laying a foundation for mass production.
  • the power supply device provided by the present invention can also be applied to similar applications.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

La présente invention concerne un dispositif d'alimentation qui comprend un premier transformateur (T1) avec un enroulement principal (N1) et au moins un enroulement secondaire couplé de manière serrée (N2, N2') et un second transformateur (T2) avec un enroulement principal (N21) et un enroulement secondaire (N22) couplés de manière lâche. L'enroulement principal du premier transformateur est raccordé en parallèle à l'enroulement principal du transformateur secondaire et les bornes d'entrée raccordées en parallèle sont couplées aux sorties d'un circuit convertisseur multi-commutateur (3). La sortie de l'enroulement secondaire du second transformateur est munie de condensateurs (C21, C22), l'enroulement secondaire et les condensateurs sont formés dans un circuit d'oscillation pour commander une charge (RL).
PCT/CN2007/070851 2006-11-28 2007-10-09 Dispositif d'alimentation WO2008064594A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CNU2006201600988U CN201001089Y (zh) 2006-11-28 2006-11-28 一种电源装置
CN200620160098.8 2006-11-28

Publications (1)

Publication Number Publication Date
WO2008064594A1 true WO2008064594A1 (fr) 2008-06-05

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Application Number Title Priority Date Filing Date
PCT/CN2007/070851 WO2008064594A1 (fr) 2006-11-28 2007-10-09 Dispositif d'alimentation

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CN (1) CN201001089Y (fr)
WO (1) WO2008064594A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8344657B2 (en) * 2009-11-03 2013-01-01 Intersil Americas Inc. LED driver with open loop dimming control
CN102013809A (zh) * 2010-12-30 2011-04-13 南京航空航天大学 变压器带两路副边的双路双管正激直流变换器
CN102013810A (zh) * 2010-12-30 2011-04-13 南京航空航天大学 带输出中点的双路双管正激组合变换器
CN103259992B (zh) * 2013-04-01 2016-02-10 青岛海信电器股份有限公司 待机电源电路及待机方法

Citations (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
US20020071291A1 (en) * 2000-11-09 2002-06-13 Power-One Ag DC-DC converter
US20060193155A1 (en) * 2005-02-25 2006-08-31 Sanken Electric Co., Ltd. DC converter

Patent Citations (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
US20020071291A1 (en) * 2000-11-09 2002-06-13 Power-One Ag DC-DC converter
US20060193155A1 (en) * 2005-02-25 2006-08-31 Sanken Electric Co., Ltd. DC converter

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Publication number Publication date
CN201001089Y (zh) 2008-01-02

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