CN201490893U - Auto-excitation type half-bridge resonant switching power supply - Google Patents
Auto-excitation type half-bridge resonant switching power supply Download PDFInfo
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- CN201490893U CN201490893U CN2009201866504U CN200920186650U CN201490893U CN 201490893 U CN201490893 U CN 201490893U CN 2009201866504 U CN2009201866504 U CN 2009201866504U CN 200920186650 U CN200920186650 U CN 200920186650U CN 201490893 U CN201490893 U CN 201490893U
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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 utility model discloses an auto-excitation type half-bridge resonant switching power supply comprising a power transformer B2. The power supply is characterized in that a half-bridge auto-excitation type resonant converter circuit connected with the primary winding N1, N2 and Nf of the power transformer B2. Due to the adoption of the above structure, compared with the prior art, the utility model has the following advantages that (1) an isolated gate bipolar transistor is adopted in the half-bridge auto-excitation type resonant converter circuit, thereby accelerating the switching speed, reducing switching loss, and improving the dynamic characteristics of the circuit; (2) The isolated gate bipolar transistor is operated under the zero-current state by designing a series resonant inductor and a resonant capacitor reasonably for reducing the influence of the distribution parameters of a main power transformer operated under the unsaturated state, thereby having the advantages of small switching stress, high efficiency, few sharp points in ripple waves and no load short circuit, and overcoming the adverse effects of the low-frequency vibration of the main power transformer at the rest period; and (3) the auto-excitation type transformer is operated under the saturated state, two isolated gate bipolar transistors can be ensured to be conducted by turns, so as to prevent the occurrence of the half-bridge through phenomenon.
Description
Technical field:
The utility model relates to Switching Power Supply, specifically relates to a kind of auto-excitation type half-bridge resonance Switching Power Supply.
Background technology:
The working method of the big more options separate excitation of traditional half-bridge switch power source, it forms the two group pulse drive circuits driving of two triodes of half-bridge by the additional auxiliary low pressure DC power supply of the needs that separate, because the straight-through Switching Power Supply that makes of half-bridge takes place and damages in the existence of time-delay often; In, also need to add pre-promotion level and isolation drive transformer during high-power output, cause machine volume to increase, efficient and reliability reduce.Though and common auto-excitation type half-bridge switch power source can be avoided above problem, but be difficult to solve the adverse effect that main power transformer caused owing to low-frequency oscillation in stand-down again.
The utility model content:
Technical problem to be solved in the utility model is, at the deficiencies in the prior art, a kind of auto-excitation type half-bridge resonance Switching Power Supply is provided, avoid power transformer in the low-frequency oscillation that produce stand-down, eliminated power transformer and led directly to and the damage switching tube by issuable bias phenomenon of distributed constant and half-bridge.
For solving the problems of the technologies described above, the technical solution of the utility model is a kind of auto-excitation type half-bridge resonance Switching Power Supply, comprise power transformer B2, it is characterized in that: be provided with the half-bridge self-excitation controlled resonant converter circuit that is connected with the elementary winding N1 of power transformer B2, N2, Nf in the described Switching Power Supply, described converter circuit comprises igbt T1, T2, self-excitation transformer B1, and the resonant capacitance C6 that is connected in series with resonant inductance L1 forms.The drain electrode of the source electrode of igbt T1 and igbt T2 is joined, the drain electrode of igbt T1 connects rectifier power source D1 positive pole, the source electrode of igbt T2 connects rectifier power source D1 negative pole, and the grid of igbt T1, T2 links to each other with secondary winding N7, the N8 of self-excitation transformer B1 with speed-up capacitor C12, C13 by current-limiting resistance R3, R4 respectively; Starting of oscillation biasing resistor R2 links to each other with igbt T2 grid by bidirectional diode D3 with capacitor C 4 serial connections point, constitute start-up circuit, resistance R 6, capacitor C 15 are attempted by the serial connection common point of igbt T1, T2 and being connected between the common point of resonant capacitance C6 and the elementary winding N1 of power transformer B2, constitute igbt drain electrode peak voltage and absorb circuit.
A kind of auto-excitation type half-bridge resonance Switching Power Supply, the elementary winding N2 of described power transformer B2 constitutes the shunt circuit with the elementary winding N5 of self-excitation transformer B1 and links to each other with the elementary winding N1 of power transformer B2, the common port of N2, the elementary winding N2 of power transformer B2 is 1 circle winding, the elementary winding Nf of power transformer B2 is the feedback winding, and the elementary winding N6 by phase-shift delay circuit and the resistance R 5 that connects and capacitor C 14 and self-excitation transformer B1 is connected to form the positive feedback control loop.
A kind of auto-excitation type half-bridge resonance Switching Power Supply, described resonant inductance L1 is connected on the common point with the elementary winding N1 of power transformer B2 with the serial connection point that resonance capacitor C 6 is serially connected in dividing potential drop filter capacitor C2, C3.
A kind of auto-excitation type half-bridge resonance Switching Power Supply, described self-excitation transformer B1 adopts annular ferrite core.
A kind of auto-excitation type half-bridge resonance Switching Power Supply owing to adopt said structure, compared with prior art has the following advantages; (1) adopts igbt (IGBT) in the half-bridge self-excitation controlled resonant converter circuit, the existence that adds igbt T1, T2 grid capacitance C12, C13 can acceleration switch speed, reduce switching loss, prevent the conducting altogether of two igbts, improved the dynamic characteristic of circuit; (2) main power transformer is operated in undersaturated condition, for reducing its effects of distribution parameters, by appropriate design series resonance inductance L 1 and resonance capacitor C 6, make igbt be operated in zero current condition, it is little to have switch stress, the efficient height, and spine is few in the ripple, and the advantage of not being afraid of load short circuits, overcome the adverse effect of main power transformer in low-frequency oscillation stand-down; (3) shunt circuit of the elementary winding N5 formation of employing elementary winding N2 of power transformer and self-excitation transformer B1, improved the elementary impulse waveform of power transformer B2, prevent that power supply is in zero load during to fully loaded the variation, because the variation of electric current causes the self-excitation transformer primary inductance to change, and then influences self-oscillatory frequency; (4) self-excitation transformer is operated in saturation condition, has guaranteed that two igbts take turns conducting, thereby has stoped the generation of the straight-through phenomenon of half-bridge.
Description of drawings
Below in conjunction with accompanying drawing and concrete execution mode the utility model is described in further detail;
Fig. 1 is the functional-block diagram of a kind of auto-excitation type half-bridge resonance of the utility model Switching Power Supply,
Fig. 2 is the electrical block diagram of a kind of auto-excitation type half-bridge resonance of the utility model Switching Power Supply.
Embodiment
As shown in Figure 1 and Figure 2, in the present embodiment, alternating voltage obtains direct voltage through rectifier bridge D1 and capacitor C 1 rectifying and wave-filtering on capacitor C 1.Constitute half-bridge self-excitation series resonant converter circuit by igbt (IGBT) T1, T2, self-excitation transformer B1, power transformer B2 and series resonance inductance L 1 and resonance capacitor C 6.Wherein, the drain electrode of the source electrode of igbt T1 and igbt T2 is joined, the drain electrode of igbt T1 connects rectifier power source D1 positive pole, the source electrode of igbt T2 connects rectifier power source D1 negative pole, and two tube grids link to each other with two secondary winding of self-excitation transformer B1 with speed-up capacitor C12, C13 by current-limiting resistance R3, R4 respectively; The elementary winding N2 of power transformer B2 is directly in parallel with the elementary winding N5 of self-excitation transformer B1, links to each other with the common port of igbt T2 with igbt T1 then.Main power insulated gate bipolar transistor T1, T2 adopt the autoexcitation Driving technique, use annular ferrite core to make self-excitation transformer B1.Series resonance inductance L 1 and resonance capacitor C 6 are serially connected between the elementary winding N1 of the mid point of dividing potential drop filter capacitor C2, capacitor C 3 and power transformer B2.Resistance R 6, capacitor C 15 are attempted by between the common point of the common point of two igbts and resonant capacitance C6 and the elementary winding N1 of power transformer B2, constitute switching tube drain electrode peak voltage and absorb circuit, prevent to damage the IGBT pipe because of the too high generation second breakdown of peak voltage.The elementary winding N5 of the elementary winding N2 of power transformer B2 and self-excitation transformer B1 constitutes the shunt circuit, the elementary winding N2 of power transformer B2 is only around 1 circle, can improve the elementary impulse waveform of power transformer B2, prevent power supply zero load during to fully loaded the variation because the variation of electric current, cause the self-excitation transformer primary inductance to change, and then influence self-oscillatory frequency.
Starting of oscillation biasing resistor R2, charging capacitor C4, bidirectional diode D3 constitute start-up circuit.After bidirectional diode D3 conducting, igbt T2 conducting, bidirectional diode D3 disconnects afterwards; The elementary winding N1 conducting of power transformer B2 gives capacitor C 3 chargings, and igbt T2 continues to add heavily conducting, and igbt T1 turn-offs.After circuit start, when capacitor C 3 chargings finish, the feedback winding Nf inductive primary winding N1 electric current of power transformer B2 and conducting, by phase-shift delay circuitous resistance R5, capacitor C 14 makes the N6 winding conducting of self-excitation transformer B1, the secondary winding N7 of self-excitation transformer B1, the drive pulse signal of N8 coupling output two-way phase phasic difference 180 degree, drive igbt T1 and igbt T2 respectively, at this moment igbt T1 conducting, and igbt T2 ends, the elementary winding N1 reverse-conducting of power transformer B2 gives capacitor C 2 chargings afterwards, igbt T1 continues to add heavily conducting, and igbt T2 turn-offs.When capacitor C 2 chargings finish, the feedback winding Nf inductive primary winding N1 reverse current of power transformer B2 and conducting, by phase-shift delay network resistor R5, capacitor C 14 makes the elementary winding N6 conducting of self-excitation transformer B1, the inferior grade coupled output of self-excitation transformer B1 and the two-way pulse that last time phase place was opposite, at this moment igbt T1 ends and igbt T2 conducting, go round and begin again then, adopt the elementary winding N6 of power transformer B2 feedback winding Nf and self-excitation transformer B1 to constitute the positive feedback control loop, self-excitation transformer B1 design work is in saturation condition, guarantee igbt T1 and igbt T2 one after the other conducting, thereby prevent the generation of the straight-through phenomenon of half-bridge.Secondary winding N3, the N4 of power transformer B2 exports the DC power supply of different electric pressures respectively by rectification circuit.
Adopt self-excited half-bridge series resonant converter circuit, make the IGBT pipe be operated in zero current condition, it is little to have a switch stress, the efficient height, and spine is few in the ripple, and the advantage of not being afraid of load short circuits, has overcome the adverse effect of transformer in low-frequency oscillation stand-down; Spike absorbs the peak voltage that network has reduced the IGBT pipe, and with the temperature rise control of power transformer B2 in 10 ℃; Adopt start-up circuit to need not to force starting of oscillation just can work, reduced the use of components and parts, machine volume reduces, and efficient and reliability improve greatly; Carrying load ability is strong, active device is less, easy production, easy care, extends in other miniaturization high pressure low current, the application scenario of high power switching power supply, has certain practical value.
In conjunction with the accompanying drawings the utility model has been carried out exemplary description above; obvious specific implementation of the present utility model is not subjected to the restriction of aforesaid way; as long as adopted the improvement of the various unsubstantialities that method of the present utility model design and technical scheme carry out; or design of the present utility model and technical scheme are directly applied to other occasion without improving, all within protection range of the present utility model.
Claims (4)
1. auto-excitation type half-bridge resonance Switching Power Supply, comprise power transformer B2, it is characterized in that: be provided with elementary winding N1 in the described Switching Power Supply with power transformer B2, N2, the Nf half-bridge self-excitation controlled resonant converter circuit that is connected, described converter circuit comprises igbt T1, T2, self-excitation transformer B1, and the resonant capacitance C6 that is connected in series with resonant inductance L1 forms, the drain electrode of the source electrode of igbt T1 and igbt T2 is joined, the drain electrode of igbt T1 connects rectifier power source D1 positive pole, the source electrode of igbt T2 meets rectifier power source D1 negative pole, igbt T1, the grid of T2 is respectively by current-limiting resistance R3, R4 and speed-up capacitor C12, the secondary winding N7 of C13 and self-excitation transformer B1, N8 links to each other; Starting of oscillation biasing resistor R2 links to each other with igbt T2 grid by bidirectional diode D3 with capacitor C 4 serial connections point, constitute start-up circuit, resistance R 6, capacitor C 15 be attempted by igbt T1, T2, being connected between the common point of serial connection common point and resonant capacitance C6 and the elementary winding N1 of power transformer B2, constitute igbt drain electrode peak voltage and absorb circuit.
2. a kind of auto-excitation type half-bridge resonance Switching Power Supply according to claim 1, it is characterized in that: the elementary winding N2 of described power transformer B2 constitutes the shunt circuit with the elementary winding N5 of self-excitation transformer B1 and links to each other with the elementary winding N1 of power transformer B2, the common port of N2, the elementary winding N2 of power transformer B2 is 1 circle winding, the elementary winding Nf of power transformer B2 is the feedback winding, and the elementary winding N6 by phase-shift delay circuit and the resistance R 5 that connects and capacitor C 14 and self-excitation transformer B1 is connected to form the positive feedback control loop.
3. a kind of auto-excitation type half-bridge resonance Switching Power Supply according to claim 1 is characterized in that: the serial connection point that described resonant inductance L1 and resonance capacitor C 6 are serially connected in dividing potential drop filter capacitor C2, C3 is connected between the common point with the elementary winding N1 of power transformer B2.
4. a kind of auto-excitation type half-bridge resonance Switching Power Supply according to claim 1 and 2 is characterized in that: described self-excitation transformer B1 adopts annular ferrite core.
Priority Applications (1)
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CN2009201866504U CN201490893U (en) | 2009-07-29 | 2009-07-29 | Auto-excitation type half-bridge resonant switching power supply |
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CN2009201866504U CN201490893U (en) | 2009-07-29 | 2009-07-29 | Auto-excitation type half-bridge resonant switching power supply |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104052287A (en) * | 2013-03-14 | 2014-09-17 | 株式会社东芝 | Dc-dc converter |
CN104993688A (en) * | 2015-07-08 | 2015-10-21 | 武汉华中数控股份有限公司 | Half-bridge circuit |
CN110277925A (en) * | 2019-07-03 | 2019-09-24 | 嘉兴福气多温控床有限公司 | The power circuit of temperature control waistband |
CN110350802A (en) * | 2019-07-31 | 2019-10-18 | 福州福光百特自动化设备有限公司 | A kind of dual transformer self-excited oscillation type half-bridge driven multiplication of voltage translation circuit |
CN113227801A (en) * | 2018-11-07 | 2021-08-06 | 威电科技有限公司 | Derivative voltage and current sensing device |
-
2009
- 2009-07-29 CN CN2009201866504U patent/CN201490893U/en not_active Expired - Fee Related
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104052287A (en) * | 2013-03-14 | 2014-09-17 | 株式会社东芝 | Dc-dc converter |
CN104993688A (en) * | 2015-07-08 | 2015-10-21 | 武汉华中数控股份有限公司 | Half-bridge circuit |
CN113227801A (en) * | 2018-11-07 | 2021-08-06 | 威电科技有限公司 | Derivative voltage and current sensing device |
CN110277925A (en) * | 2019-07-03 | 2019-09-24 | 嘉兴福气多温控床有限公司 | The power circuit of temperature control waistband |
CN110350802A (en) * | 2019-07-31 | 2019-10-18 | 福州福光百特自动化设备有限公司 | A kind of dual transformer self-excited oscillation type half-bridge driven multiplication of voltage translation circuit |
CN110350802B (en) * | 2019-07-31 | 2024-04-05 | 福州福光百特自动化设备有限公司 | Double-transformer self-oscillation type half-bridge driving voltage-multiplying conversion circuit |
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