CN104467439A - LLC soft switching method for improving switching power supply efficiency - Google Patents
LLC soft switching method for improving switching power supply efficiency Download PDFInfo
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- CN104467439A CN104467439A CN201410716637.0A CN201410716637A CN104467439A CN 104467439 A CN104467439 A CN 104467439A CN 201410716637 A CN201410716637 A CN 201410716637A CN 104467439 A CN104467439 A CN 104467439A
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- field effect
- effect transistor
- llc
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- soft
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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
- H02M3/33507—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 with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—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 with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
-
- 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
- H02M3/33569—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 several active switching elements
-
- 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)
- Dc-Dc Converters (AREA)
- Rectifiers (AREA)
Abstract
The invention discloses an LLC soft switching method for improving switching power supply efficiency. An LLC main topological structure comprises a field effect transistor V1 and a field effect transistor V2, the source electrode of the field effect transistor V1 is connected with the drain electrode of the field effect transistor V2 in series, a capacitor C2 is connected between the drain electrode of the field effect transistor V1 and the source electrode of the field effect transistor V1 in parallel, a capacitor C3 is connected between the drain electrode of the field effect transistor V2 and the source electrode of the field effect transistor V2 in parallel, an input capacitor CD1 is connected between the drain electrode of the field effect transistor V1 and the source electrode of the field effect transistor V2 in series, a resonant inductor L6 is electrically connected with a node between the source electrode of the field effect transistor V1 and the drain electrode of the field effect transistor V2, the resonant inductor L6 is connected with a terminal of a primary winding of a transformer, and a resonant capacitor C1 is connected between the other terminal of the primary winding of the transformer and the source electrode of the field effect transistor V2. The LLC soft switching method has the advantage of improving switching power supply efficiency.
Description
Technical field
The present invention relates to communication power supply field, particularly, relate to a kind of LLC soft-switching process of high switch power efficiency.
Background technology
Communication power supply is by the development of nearly decades, from phase-controlled power, hard switching high frequency switch power, to the soft switch high-frequency Switching Power Supply that zero-voltage zero-current switches, the high efficiency high frequency switch power of New Topological circuit till now again, efficiency one tunnel of communication power supply promotes, improved efficiency from early stage 70% ~ 80% to recent 90% more till now 96% system effectiveness, energy-saving effect is remarkable, for outstanding contribution is made in energy-saving and emission-reduction.In recent years, operator starts batch use high efficiency communication power supply in communication base station.
At present, three kinds are mainly contained at the power supply of communication online operation: linear power supply, phase-controlled power and Switching Power Supply.Wherein, Switching Power Supply, because of its technical characterstic, has that volume is little, efficiency is high, lightweightly realizes modularized design (usually adopting N+1 backup), system reliability advantages of higher, become the most popular power-supply device of the communications industry.From the development of Switching Power Supply, its marginal technological break-through occuping leading position in communication power supply is impelled to comprise:
(1) flow equalize technology makes Switching Power Supply can form unprecedented big current system by multiple module paralleling, and improves the reliability of system;
(2) development of switching circuit, makes the frequency of Switching Power Supply efficiency while improving constantly also get a promotion, and the transform power of each module is constantly increased, and particularly after soft switch technique application, effect is more obvious;
(3) power factor correction technology effectively improves the power factor of Switching Power Supply, constantly strengthens the epoch in environmental consciousness, and this is that it occupy the key of leading position;
(4) intellectuality brings great convenience to maintenance work, improves maintenance quality, makes it enjoy favor.In today that market competition is growing more intense, communication power supply just strides forward towards intellectuality, low cost, high power density direction.Along with the fast development of electronic devices and components, add the breakthrough of some key technologies, present Communication Power Equipment with than compared with several years ago, be all greatly improved in every respect.
But improve further along with energy-conservation energy-saving and cost-reducing and user cuts operating costs, the demand improving conversion efficiency further to communication power supply is also original stronger, and current Switching Power Supply developed into for the 5th generation after the technology application such as carborundum (SiC) device and novel magnetic materials (as non-crystalline material) etc., advanced circuit topology, DSP be digital control: high-efficiency power.
Switching Power Supply work is generally divided into following a few step
1, input rectifying: lead directly to rectifier bridge by input AC or direct current and become direct current and be stored in elementary electric capacity.
2, high frequency chopping: by control loop control switch device high speed break-make, the direct current held is cut into interchange and AC energy is coupled to secondary by transformer from primary electrical.
3, secondary commutation filtering: be coupled to secondary alternating current and be supplied to load use by diode rectification, output capacitance filtering.
4, feed back: output voltage or electric current return control loop through sampling feedback, control to export by the duty ratio of high-speed switching devices work or frequency the stationary value (dynamic stability) reaching expectation.
In high frequency chopping loss, switching device is not 0 impedance when complete conducting, and this causes on switching device, have some heating loss.
In addition, in the process turned on and off, switching device generally all can through linear zone.If there is voltage at switching tube two ends or has electric current to flow through in the process breaker in middle device turned off when opening, then switching loss can be produced.Hard switching loss is comprised in switching loss.
Summary of the invention
From diode fabrication process, between the grid of MOSFET and source electrode, parasitic capacitance must be had.Which results in when driven MOS FET, the voltage between MOSFET grid source electrode slowly rises.This just determines the place that MOSFET two ends in this process have voltage and current to intersect, as shown in Figure 2 a and 2 b,
arrive
between moment, the voltage at switching device two ends and the electric current passed through have the place of intersection.Loss (holding loss) can be produced on switching device.The energy of loss is:
；
?
arrive
in the moment, if switching device has electric current to pass through, also can produce loss (pass loss) on switching device.The energy of loss is:
。
The energy of upper area loss can not be transferred to secondary by transformer, but is lost by the mode of heating.Not only hindering the raising of Switching Power Supply whole efficiency, and bring larger heat radiation pressure to switching device, making the power that people have to by strengthening fin or increase cooling fan.This all makes switch power efficiency further reduce.
The object of the invention is to, for the problems referred to above, propose a kind of LLC soft-switching process of high switch power efficiency, to realize the advantage improving switch power efficiency.
For achieving the above object, the technical solution used in the present invention is:
A kind of LLC soft-switching process improving switch power efficiency, the main topological structure of described LLC, comprise field effect transistor V1 and field effect transistor V2, the source electrode of described field effect transistor V1 and the drain series of field effect transistor V2, shunt capacitance C2 between the drain electrode of described field effect transistor V1 and source electrode, shunt capacitance C3 between the drain electrode of described field effect transistor V2 and source electrode, connect between the drain electrode of described field effect transistor V1 and the source electrode of field effect transistor V2 input capacitance CD1, node between the source electrode of described field effect transistor V1 and the drain electrode of field effect transistor V2 is electrically connected resonant inductance L6, resonant inductance L6 is connected with a terminal of the first winding of transformer, series resonant capacitance C1 between another terminal of the first winding of transformer and the source electrode of field effect transistor V2,
Described LLC soft-switching process comprises:
Control field effect transistor V1 open-minded, field effect transistor V 2 turns off, and described input capacitance CD1 charges to C3, when electric capacity C3 be charged to consistent with input capacitance CD1 voltage after, realize the step of the soft switching to described field effect transistor V1;
After described field effect transistor V1 soft switching, the afterflow effect of resonant inductance L6 makes have electric current to flow through in the LLC loop be made up of the first winding of resonant inductance L6, transformer and resonant capacitance C1, thus the electric charge on electric capacity C3 is taken away, and due to the clamping action of field effect transistor V 2, the electric current flowing through LLC loop can to electric capacity C3 reverse charging, control field effect transistor V 2 to open, realize field effect transistor V 2 no-voltage open-minded, namely the soft of field effect transistor V 2 opens step;
Before LLC loop current oppositely, control to close field effect transistor V 2, by the ground voltage clamper between the source electrode of field effect transistor V 2 and drain electrode at about 0.5V, thus realize the step of field effect transistor V 2 soft switching;
After field effect transistor V 2 soft switching, LLC loop current starts oppositely, and reverse electric current charges to electric capacity C3, until the voltage of input capacitance CD1 and electric capacity C3 is equal, one part of current is gone by the anti-input capacitance CD1 that is poured into of field effect transistor V1; Take away the electric charge on electric capacity C2 simultaneously, by the voltage clamping at electric capacity C2 two ends to about 0.5V, now control to open field effect transistor V1, thus the no-voltage realizing field effect transistor V1 is open-minded, namely realizes the soft step opened of field effect transistor V1.
According to a preferred embodiment of the invention, link control module on described field effect transistor V1 and field effect transistor V2, described control module realizes the accurate open and close controlling to field effect transistor V1 and field effect transistor V2.
Technical scheme of the present invention has following beneficial effect:
Technical scheme of the present invention, by LLC soft-switching process, makes switching device avoid the place of voltage and current intersection when opening or closing, thus reduces the switching loss produced in the process opened or turn off.Reach the object improving switch power efficiency.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is the main topological structure schematic diagram of the LLC described in the embodiment of the present invention;
Fig. 2 a and Fig. 2 b is the graph of relation of MOSFET tube voltage and electric current.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.
So-called Sofe Switch is exactly the place allowing switching device avoid voltage and current intersection when opening or closing in fact.Such as select
open-minded when being zero, in selection
turn off when being zero.Character from calculus:
；
The main topological structure of LLC as shown in Figure 1, comprise field effect transistor V1 and field effect transistor V2, the source electrode of field effect transistor V1 and the drain series of field effect transistor V2, shunt capacitance C2 between the drain electrode of field effect transistor V1 and source electrode, shunt capacitance C3 between the drain electrode of field effect transistor V2 and source electrode, connect between the drain electrode of field effect transistor V1 and the source electrode of field effect transistor V2 input capacitance CD1, node between the source electrode of field effect transistor V1 and the drain electrode of field effect transistor V2 is electrically connected resonant inductance L6, resonant inductance L6 is connected with a terminal of the first winding of transformer; Series resonant capacitance C1 between another terminal of the first winding of transformer and the source electrode of field effect transistor V2;
LLC soft-switching process comprises:
Control field effect transistor V1 open-minded, field effect transistor V 2 turns off, and input capacitance CD1 charges to C3, when electric capacity C3 be charged to consistent with input capacitance CD1 voltage after, realize the step of the soft switching to described field effect transistor V1;
After field effect transistor V1 soft switching, the afterflow effect of resonant inductance L6 makes have electric current to flow through in the LLC loop be made up of the first winding of resonant inductance L6, transformer and resonant capacitance C1, thus the electric charge on electric capacity C3 is taken away, and due to the clamping action of field effect transistor V 2, the electric current flowing through LLC loop can to electric capacity C3 reverse charging, control field effect transistor V 2 to open, realize field effect transistor V 2 no-voltage open-minded, namely the soft of field effect transistor V 2 opens step;
Before LLC loop current oppositely, control to close field effect transistor V 2, by the ground voltage clamper between the source electrode of field effect transistor V 2 and drain electrode at about 0.5V, thus realize the step of field effect transistor V 2 soft switching;
After field effect transistor V 2 soft switching, LLC loop current starts oppositely, and reverse electric current charges to electric capacity C3, until the voltage of input capacitance CD1 and electric capacity C3 is equal, one part of current is gone by the anti-input capacitance CD1 that is poured into of field effect transistor V1; Take away the electric charge on electric capacity C2 simultaneously, by the voltage clamping at electric capacity C2 two ends to about 0.5V, now control to open field effect transistor V1, thus the no-voltage realizing field effect transistor V1 is open-minded, namely realizes the soft step opened of field effect transistor V1.
Link control module on field effect transistor V1 and field effect transistor V2, described control module realizes the accurate open and close controlling to field effect transistor V1 and field effect transistor V2.
Realize Sofe Switch, key is to seize the opportunity.In order to get hold of this opportunity, first, need elementary operating state to feed back to control end.Moreover, need the parameter adjusting LLC loop to make put controlled terminal the opportunity of opening, turning off and clearly perceived by feedback.And then reach effective control.
The relative inductance of induction reactance of transformer is larger, and the power fallen on the transformer is higher, and power output is higher, and efficiency is also higher.If but resonant inductance is too little relative to transformer, hard switching situation will be made serious all the more.Reduce overall efficiency on the contrary.Through experimental verification for many years, confirm that overall efficiency is the highest when inductance and primary induction reactance ratio are 1:5, namely the induction reactance of resonant inductance L6 and the first winding of transformer is than being 1:5.Also be not easy to occur hard switching situation.
Resonant inductance L6 and power output are inversely proportional to.And under the operating frequency determined, primary return electric current is larger, just require that resonant capacitance C1 is larger; Input electrochemical capacitor CD1 voltage is higher, just requires that resonant capacitance C1 capacity is less.
Last it is noted that the foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although with reference to previous embodiment to invention has been detailed description, for a person skilled in the art, it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (2)
1. one kind is improved the LLC soft-switching process of switch power efficiency, it is characterized in that, the main topological structure of described LLC, comprise field effect transistor V1 and field effect transistor V2, the source electrode of described field effect transistor V1 and the drain series of field effect transistor V2, shunt capacitance C2 between the drain electrode of described field effect transistor V1 and source electrode, shunt capacitance C3 between the drain electrode of described field effect transistor V2 and source electrode, connect between the drain electrode of described field effect transistor V1 and the source electrode of field effect transistor V2 input capacitance CD1, node between the source electrode of described field effect transistor V1 and the drain electrode of field effect transistor V2 is electrically connected resonant inductance L6, resonant inductance L6 is connected with a terminal of the first winding of transformer, series resonant capacitance C1 between another terminal of the first winding of transformer and the source electrode of field effect transistor V2,
Described LLC soft-switching process comprises:
Control field effect transistor V1 open-minded, field effect transistor V 2 turns off, and described input capacitance CD1 charges to C3, when electric capacity C3 be charged to consistent with input capacitance CD1 voltage after, realize the step of the soft switching to described field effect transistor V1;
After described field effect transistor V1 soft switching, the afterflow effect of resonant inductance L6 makes have electric current to flow through in the LLC loop be made up of the first winding of resonant inductance L6, transformer and resonant capacitance C1, thus the electric charge on electric capacity C3 is taken away, and due to the clamping action of field effect transistor V 2, the electric current flowing through LLC loop can to electric capacity C3 reverse charging, control field effect transistor V 2 to open, realize field effect transistor V 2 no-voltage open-minded, namely the soft of field effect transistor V 2 opens step;
Before LLC loop current oppositely, control to close field effect transistor V 2, by the ground voltage clamper between the source electrode of field effect transistor V 2 and drain electrode at about 0.5V, thus realize the step of field effect transistor V 2 soft switching;
After field effect transistor V 2 soft switching, LLC loop current starts oppositely, and reverse electric current charges to electric capacity C3, until the voltage of input capacitance CD1 and electric capacity C3 is equal, one part of current is gone by the anti-input capacitance CD1 that is poured into of field effect transistor V1; Take away the electric charge on electric capacity C2 simultaneously, by the voltage clamping at electric capacity C2 two ends to about 0.5V, now control to open field effect transistor V1, thus the no-voltage realizing field effect transistor V1 is open-minded, namely realizes the soft step opened of field effect transistor V1.
2. the LLC soft-switching process of raising switch power efficiency according to claim 1, it is characterized in that, link control module on described field effect transistor V1 and field effect transistor V2, described control module realizes the accurate open and close controlling to field effect transistor V1 and field effect transistor V2.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410716637.0A CN104467439A (en) | 2014-12-02 | 2014-12-02 | LLC soft switching method for improving switching power supply efficiency |
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| CN201410716637.0A CN104467439A (en) | 2014-12-02 | 2014-12-02 | LLC soft switching method for improving switching power supply efficiency |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105048812A (en) * | 2015-07-17 | 2015-11-11 | 许继电源有限公司 | LLC resonant circuit |
| CN106411105A (en) * | 2016-06-17 | 2017-02-15 | 安徽长远绿色能源有限公司 | Soft-switching circuit topology based on charging and discharging of capacitor |
| CN108111024A (en) * | 2018-01-24 | 2018-06-01 | 深圳市英能达电子有限公司 | A kind of switching power circuit and its Switching Power Supply |
| WO2019051820A1 (en) * | 2017-09-18 | 2019-03-21 | 深圳欣锐科技股份有限公司 | Soft switch circuit |
| CN112217274A (en) * | 2020-09-03 | 2021-01-12 | 深圳市领灿科技有限公司 | Double-backup power circuit |
-
2014
- 2014-12-02 CN CN201410716637.0A patent/CN104467439A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| 任丽君: "LLC半桥变换器的优化设计与同步整流技术的研究", 《中国优秀硕士学位论文全文数据库（工程科技Ⅱ辑）》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105048812A (en) * | 2015-07-17 | 2015-11-11 | 许继电源有限公司 | LLC resonant circuit |
| CN105048812B (en) * | 2015-07-17 | 2018-09-28 | 许继电源有限公司 | A kind of LLC resonance circuits |
| CN106411105A (en) * | 2016-06-17 | 2017-02-15 | 安徽长远绿色能源有限公司 | Soft-switching circuit topology based on charging and discharging of capacitor |
| CN106411105B (en) * | 2016-06-17 | 2019-03-15 | 安徽长远绿色能源有限公司 | A kind of soft switch circuit topology based on capacitor charge and discharge |
| WO2019051820A1 (en) * | 2017-09-18 | 2019-03-21 | 深圳欣锐科技股份有限公司 | Soft switch circuit |
| CN108111024A (en) * | 2018-01-24 | 2018-06-01 | 深圳市英能达电子有限公司 | A kind of switching power circuit and its Switching Power Supply |
| CN112217274A (en) * | 2020-09-03 | 2021-01-12 | 深圳市领灿科技有限公司 | Double-backup power circuit |
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Application publication date: 20150325 |