CN206195631U - Efficient half -bridge resonance AC DC converter - Google Patents

Efficient half -bridge resonance AC DC converter Download PDF

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Publication number
CN206195631U
CN206195631U CN201621049393.6U CN201621049393U CN206195631U CN 206195631 U CN206195631 U CN 206195631U CN 201621049393 U CN201621049393 U CN 201621049393U CN 206195631 U CN206195631 U CN 206195631U
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CN
China
Prior art keywords
circuit
converter
efficient
transformer
bridge
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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
CN201621049393.6U
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Chinese (zh)
Inventor
王硕
王旭东
于勇
谢瑞
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Harbin University of Science and Technology
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Harbin University of Science and Technology
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Priority to CN201621049393.6U priority Critical patent/CN206195631U/en
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Expired - Fee Related legal-status Critical Current
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10Technologies 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

Abstract

The utility model discloses an efficient half -bridge resonance AC DC converter, including boost PFC power correction unit, direct current BUS capacitors, transformer once incline circuit and secondary side circuit, its characterized in that: once inclining, two power switchs pipe qp1 constitute half -bridge inverter circuit with qp2 in the circuit, drain electrode of lower power switch pipe qp2 and resonant inductance LR, and the transformer once inclines inductance lm establishes ties with resonant capacitor CRC and constitutes the return circuit, and auxiliary switch QA and supplementary electric capacity CRA establish ties the auxiliary device and the resonant capacitor CRC that constitute and connect in parallel, and transformer secondary side circuit is full wave rectifier circuit.

Description

A kind of efficient half-bridge resonance AC-DC converter
Technical field
The utility model is related to switch power technology field, particularly a kind of efficient half-bridge resonance AC-DC converter.
Background technology
Half-bridge resonance formula DC/DC converters are few due to circuit element quantity, small volume, high efficiency and high power density etc. Advantage, is widely used in DC-DC converter, particularly Active Power Factor Correction Technology PFC and LLC resonant modes DC/DC Converter composition topological structure turn into distributed power supply system main flow topological structure, and be widely used in server power supply, The fields such as the communication power supply and Aero-Space of electronic communication equipment.
Output voltage stabilization can be kept under input voltage range wider in order to meet DC/DC sides, is particularly serviced Device power supply is in the case of power down holding, it is ensured that the safety of load data, as shown in figure 1, generally needing transformer in design Magnetizing inductance is smaller to ensure output voltage stabilization obtaining larger output voltage gain.However, larger magnetizing inductance is resulted in Half-bridge logical link control (LLC) resonant circuit primary side produces larger conduction and switching loss in normal operating conditions, to efficient requirement Produce influence.
To solve that converter switches loss can be reduced in the case of larger magnetizing inductance, transducer effciency is improved Meanwhile, can make converter that maximum output voltage yield value is reached when DC bus-bar voltage is minimum again, keep output voltage steady Fixed, existing method such as, in failure retention time, no-load voltage ratio is changed by increasing the Circuit Fault on Secondary Transformer number of turn, obtains converter The mode of high voltage gain, but be the increase in circuit complexity and reduce inverter power density, boost pulse width modulation mode With the mode that asymmetric pulse widths modulate LLC half bridge resonant, both modes are only suitable in small-power applications, and Extra PWM control methods increased complexity, therefore several method all has certain limitation.
The content of the invention
Problem to be solved in the utility model is to overcome existing technological deficiency, it is proposed that a kind of efficient half-bridge resonance AC-DC converter, in the case of from larger magnetizing inductance, reduces switching loss, while improving efficiency, can fall again Output voltage stabilization is kept when electric.
In order to solve the above problems, the technical solution adopted in the utility model is:A kind of efficient half-bridge resonance AC-DC becomes Parallel operation, including Boost PFC capability correction units, dc-link capacitance, lateral circuit of transformer and secondary side circuit, once Two power switch pipe Q in lateral circuitp1And Qp2Constitute half-bridge inversion circuit, lower power switch pipe Qp2Drain electrode and resonant inductance LR, Transformer primary side inductance LmWith resonant capacitance CRCLoop in series, auxiliary switch QAWith auxiliary capacitor CRAWhat is be composed in series is auxiliary Help device and resonant capacitance CRCParallel connection, transformer secondary lateral circuit be full-wave rectifying circuit, by auxiliary switch driver element come The shut-off of auxiliary switch is controlled so as to change resonant capacitance, output voltage gain is improved.
Two half-bridge power switch pipe input signals of transformer primary side are complementary, and switching frequency is identical and adjustable, by adjusting Switching frequency is saved to adjust output voltage.
Preferably, the auxiliary switch in the power switch pipe and servicing unit is MOSFET or IGBT.
The beneficial effects of the utility model are:Opened by installing an auxiliary at transformer primary side resonant capacitance two ends The mode with electric capacity is closed, converter is realized in normal operation, using relatively large magnetizing inductance transformer, biography is reduced Lead and switching loss, improve transducer effciency.On the other hand, when bus capacitor voltage is less than reference value, especially in power down feelings Under condition, increase resonant capacitance by opening auxiliary switch so that output voltage obtains larger gain, meet low dc bus electricity Pressure output voltage keeps normal, is that load data has safely provided protection.
Brief description of the drawings
Fig. 1 is the efficient half-bridge resonance AC-DC converter structural representation of the utility model.
Fig. 2 is principle assumption diagram of the DC-DC parts equipped with auxiliary capacitor.
Fig. 3 is the input voltage under power-down conditions, DC bus-bar voltage, and output voltage waveform.
Fig. 4 be converter in normal operation, basic circuit schematic diagram.
When Fig. 5 is too low DC bus-bar voltage, or the basic circuit schematic diagram in the case of power down holding.
Specific embodiment
The utility model is further described below in conjunction with the accompanying drawings:As shown in figure 1, a kind of efficient half-bridge resonance AC- DC converters, including Boost PFC capability correction units, dc-link capacitance, lateral circuit of transformer and secondary side circuit, As shown in Fig. 2 two power switch pipe Q in a lateral circuitp1And Qp2Constitute half-bridge inversion circuit, lower power switch pipe Qp2Leakage Pole and resonant inductance LR, transformer primary side inductance LmWith resonant capacitance CRCLoop in series, auxiliary switch QAAnd auxiliary capacitor CRAThe servicing unit being composed in series and resonant capacitance CRCParallel connection, the pass of auxiliary switch is controlled by auxiliary switch driver element Break so as to change resonant capacitance, improve output voltage gain.
Two power switch pipe input signals are complementary in half-bridge circuit described in transformer primary side, and switching frequency is identical and can Adjust, output voltage is adjusted by adjusting switching frequency.
Preferably, the auxiliary switch in described two power switch pipes and servicing unit is MOSFET or IGBT.
The beneficial effects of the utility model are:One auxiliary switch and electricity are installed by primary side resonant capacitance two ends The mode of appearance, realizes converter in normal operation, using relatively large magnetizing inductance transformer, reduces conduction and opens Loss is closed, transducer effciency is improve, on the other hand, when bus capacitor voltage is less than reference value, especially under power-down conditions, led to Cross opening auxiliary switch increase resonant capacitance so that output voltage obtains larger gain, meet defeated under low DC bus-bar voltage Go out voltage and keep normal, be that load data has safely provided protection.
As shown in figure 3, remaining in that normal working voltage when voltage is relatively low, protected in power down to meet server power supply Hold in the time, DC/DC sides can keep output voltage stabilization under input voltage range wider, it usually needs transformer is smaller Magnetizing inductance obtains larger output voltage gain, however, this has resulted in half-bridge logical link control (LLC) resonant circuit primary side in normal work Make state and produce larger conduction and switching loss, require to produce influence on efficient.
In order to select larger magnetizing inductance, improve transducer effciency while, can meet again DC bus-bar voltage it is too low when, Output voltage obtains larger gain, is that load data has safely provided protection, adds the auxiliary of auxiliary switch driver element control Help device.
Under normal condition, as shown in figure 4, QAShut-off, the voltage at parasitic capacitance two ends is approximately resonant capacitance both end voltage, Switch QAParasitic diode reversely end, parasitic capacitance is connected with auxiliary capacitor, auxiliary because resonant capacitance size is approximately constant Help device to have no influence to LLC converter normal works, reduce switching loss, improve efficiency.
Under power down hold mode, as shown in figure 5, associated drive circuitry input voltage is compared with reference voltage, reference Voltage is the minimum value that nominal input voltage is allowed, and when power down occurs, DC bus-bar voltage is reduced to minimum value, and auxiliary switch drives Dynamic output high level, QAOpen, resonant capacitance increase, Q reduces, M increases, so as to ensure to meet under larger transformer inductance The requirement of voltage gain.
The above, is to combine specific preferred embodiment further detailed description of the utility model, no Can assert that specific implementation of the present utility model is confined to these explanations, for the professional skill of the utility model art For art personnel, some simple modifications, equivalent variations and remodeling are made without departing from the concept of the premise utility, and Performance or purposes are identical, still fall within protection domain of the present utility model.

Claims (3)

1. a kind of efficient half-bridge resonance AC-DC converter, including Boost PFC capability correction units, dc-link capacitance becomes Lateral circuit of depressor and secondary side circuit, it is characterised in that:Two power switch pipe Q in lateral circuitp1And Qp2Constitute half Bridge inverter circuit, lower power switch pipe Qp2Drain electrode and resonant inductance LR, transformer primary side inductance LmWith resonant capacitance CRCSeries connection Constitute loop, auxiliary switch QAWith auxiliary capacitor CRAThe servicing unit being composed in series and resonant capacitance CRCParallel connection, transformer secondary Lateral circuit is full-wave rectifying circuit.
2. a kind of efficient half-bridge resonance AC-DC converter according to claim 1, it is characterised in that:Transformer primary side Upper and lower two power switch pipe Q in half-bridge circuitp1And Qp2Input signal is complementary signal.
3. a kind of efficient half-bridge resonance AC-DC converter according to claim 1, it is characterised in that:Described two power Switching tube Qp1、Qp2With the auxiliary switch Q in servicing unitAIt is MOSFET or IGBT.
CN201621049393.6U 2016-09-12 2016-09-12 Efficient half -bridge resonance AC DC converter Expired - Fee Related CN206195631U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201621049393.6U CN206195631U (en) 2016-09-12 2016-09-12 Efficient half -bridge resonance AC DC converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201621049393.6U CN206195631U (en) 2016-09-12 2016-09-12 Efficient half -bridge resonance AC DC converter

Publications (1)

Publication Number Publication Date
CN206195631U true CN206195631U (en) 2017-05-24

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107612329A (en) * 2017-09-23 2018-01-19 天津大学 A kind of double half-bridge DC DC converters of isolated form Boost
CN107911027A (en) * 2017-12-19 2018-04-13 哈尔滨工业大学 It is a kind of to determine frequency quasi resonant convertor
CN110808681A (en) * 2019-11-13 2020-02-18 杭州优特电源有限公司 Passive PFC resonant converter and control method thereof
CN111342670A (en) * 2020-04-07 2020-06-26 珠海格力电器股份有限公司 Half-bridge converter and control method thereof
CN112583280A (en) * 2021-02-25 2021-03-30 杭州优特电源有限公司 Resonant converter

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107612329A (en) * 2017-09-23 2018-01-19 天津大学 A kind of double half-bridge DC DC converters of isolated form Boost
CN107911027A (en) * 2017-12-19 2018-04-13 哈尔滨工业大学 It is a kind of to determine frequency quasi resonant convertor
CN110808681A (en) * 2019-11-13 2020-02-18 杭州优特电源有限公司 Passive PFC resonant converter and control method thereof
CN110808681B (en) * 2019-11-13 2021-06-29 杭州优特电源有限公司 Passive PFC resonant converter and control method thereof
CN111342670A (en) * 2020-04-07 2020-06-26 珠海格力电器股份有限公司 Half-bridge converter and control method thereof
CN111342670B (en) * 2020-04-07 2020-12-25 珠海格力电器股份有限公司 Half-bridge converter and control method thereof
CN112583280A (en) * 2021-02-25 2021-03-30 杭州优特电源有限公司 Resonant converter

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Granted publication date: 20170524

Termination date: 20180912