CN107846146A - A kind of power circuit - Google Patents
A kind of power circuit Download PDFInfo
- Publication number
- CN107846146A CN107846146A CN201710878039.7A CN201710878039A CN107846146A CN 107846146 A CN107846146 A CN 107846146A CN 201710878039 A CN201710878039 A CN 201710878039A CN 107846146 A CN107846146 A CN 107846146A
- Authority
- CN
- China
- Prior art keywords
- circuit
- transformer
- power circuit
- source
- switch
- 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.)
- Pending
Links
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
Abstract
The invention provides a kind of power circuit,Dc source connects the transformer with resonant capacitor via the on-off circuit,The secondary windings of transformer exists as the output of power circuit,Wherein,On-off circuit is arranged between dc source and the armature winding of transformer,And there is multiple switch part,Each switch sections include at least one switch element that connection is connected with half-bridge connection or full-bridge,It is arranged on including the switch sections in on-off circuit,In the closed circuit of the armature winding of dc source and transformer,For making the switch element in on-off circuit perform the control unit of ON/OFF operations respectively,And control unit keeps switch element in off position,So that the terminal voltage lifting pressure of resonant capacitor reaches predetermined value and exceedes the scheduled time,Then the output target voltage further according to power circuit performs the pulse width of the drive signal of PWM control operation switch elements.
Description
Background technology
The present invention relates to power circuit field, its especially a kind of initial voltage accuracy rate that can improve power circuit with
And the power circuit of conversion ratio.The switching power unit of such as dc-dc is characterised by high efficiency, while compact and light
Just, and
And it is widely used as the power supply of various electronic installations and device in recent years.
As such switching power unit, electricity is carried out using transformer usually using primary-side circuitry and secondary-side circuitry
The structure of insulation.In such switching power unit, it is known to which several systems are used to DC electric power being converted into high-frequency AC
Electric power and the circuit configuration for converting thereof into DC electric power.Simplest construction is unidirectional normal shock method, wherein switch elements in series
The armature winding of transformer is connected to, and switch element is actuated to turn on and ended so that electric current intermittently passes through primary
Winding.Although the advantages of this method is, not only configuration is simple, and controls stabilization, because the utilization ratio of transformer is low,
The problem of power conversion efficiency is low be present.And in general power supply all has a problem that, exactly it is not sufficiently stable in start voltage,
The job insecurity for causing power supply to load.The present invention just proposes a solution, and it greatly improves the conversion effect of power supply
Rate and start electricity
Press stability.
The content of the invention
One aspect of the present invention provides a kind of power circuit, and the power circuit includes dc source, on-off circuit, transformation
Device and resonant capacitor, it is characterised in that
The dc source connects the transformer, the secondary windings of the transformer with resonant capacitor via the on-off circuit
Exist as the output of the power circuit, wherein,
The on-off circuit is arranged between the armature winding of the dc source and transformer, and has multiple switch part,
Each switch sections include at least one switch element that connection is connected with half-bridge connection or full-bridge;
The resonating capacitor, it is arranged on the armature winding for including the switch sections in on-off circuit, dc source and transformer
Closed circuit in;
For making the switch element in on-off circuit perform the control unit of ON/OFF operations respectively, during the power work,
At least comprise the following steps in startup stage：
Described control unit keeps switch element in off position so that the terminal voltage lifting pressure of the resonant capacitor reaches pre-
Definite value simultaneously exceedes the scheduled time, and then the output target voltage further according to the power circuit is performed and opened described in PWM control operations
Element is closed, to change the pulse width for the drive signal that be supplied to the switch element.
Wherein, each cycle of the PWM operations includes keeping the resonance for the armature winding and capacitor for including transformer
State.
The present invention possesses following technique effect：Its one side greatly reduces the switch resistance of power supply, improves power supply
Conversion efficiency；On the other hand improve power supply start when voltage the degree of accuracy, reduce power circuit start when voltage not
It is stable.
Embodiment
Embodiment one.
Present embodiments provide a kind of power circuit, the power circuit include dc source, on-off circuit, transformer with
And resonant capacitor, the dc source connect the transformer with resonant capacitor via the on-off circuit, the transformer
Secondary windings exists as the output of the power circuit, wherein,
The on-off circuit is arranged between the armature winding of the dc source and transformer, and has multiple switch part,
Each switch sections include at least one switch element that connection is connected with half-bridge connection or full-bridge;
The resonating capacitor, it is arranged on the armature winding for including the switch sections in on-off circuit, dc source and transformer
Closed circuit in;In the present embodiment, on-off circuit is the inverter of half-bridge, and such closed circuit is it is to be understood that direct current
Source and half-bridge switch element, resonating capacitor, the armature winding of transformer constitute the loop of a closure, resonating capacitor
Size is set according to the armature winding of transformer so that the two can be configured selection in resonance under output frequency.
For making the switch element in on-off circuit perform the control unit of ON/OFF operations, the power work respectively
When,
At least comprise the following steps in startup stage：
Described control unit keeps switch element in off position so that the terminal voltage lifting pressure of the resonant capacitor reaches pre-
Definite value simultaneously exceedes the scheduled time, and then the output target voltage further according to the power circuit is performed and opened described in PWM control operations
Element is closed, to change the pulse width for the drive signal that be supplied to the switch element.
Wherein, each cycle of the PWM operations includes keeping the resonance for the armature winding and capacitor for including transformer
State.
Embodiment two.
Present embodiments provide a kind of power circuit, the power circuit include dc source, on-off circuit, transformer with
And resonant capacitor, the dc source connect the transformer with resonant capacitor via the on-off circuit, the transformer
Secondary windings exists as the output of the power circuit, wherein,
The on-off circuit is arranged between the armature winding of the dc source and transformer, and has multiple switch part,
Each switch sections include at least one switch element that connection is connected with half-bridge connection or full-bridge;
The resonating capacitor, it is arranged on the armature winding for including the switch sections in on-off circuit, dc source and transformer
Closed circuit in;In the present embodiment, the closed circuit forms a forward converter.
For making the switch element in on-off circuit perform the control unit of ON/OFF operations, the power work respectively
When,
At least comprise the following steps in startup stage：
Described control unit keeps switch element in off position so that the terminal voltage lifting pressure of the resonant capacitor reaches pre-
Definite value simultaneously exceedes the scheduled time, and then the output target voltage further according to the power circuit is performed and opened described in PWM control operations
Element is closed, to change the pulse width for the drive signal that be supplied to the switch element.
Wherein, each cycle of the PWM operations includes keeping the resonance for the armature winding and capacitor for including transformer
State.
Claims (2)
1. a kind of power circuit, the power circuit includes dc source, on-off circuit, transformer and resonant capacitor, and it is special
Sign is,
The dc source connects the transformer, the secondary windings of the transformer with resonant capacitor via the on-off circuit
Exist as the output of the power circuit, wherein,
The on-off circuit is arranged between the armature winding of the dc source and transformer, and has multiple switch part,
Each switch sections include at least one switch element that connection is connected with half-bridge connection or full-bridge;
The resonating capacitor, it is arranged on the armature winding for including the switch sections in on-off circuit, dc source and transformer
Closed circuit in;
For making the switch element in on-off circuit perform the control unit of ON/OFF operations respectively, during the power work,
At least comprise the following steps in startup stage：
Described control unit keeps switch element in off position so that the terminal voltage lifting pressure of the resonant capacitor reaches pre-
Definite value simultaneously exceedes the scheduled time, and then the output target voltage further according to the power circuit is performed and opened described in PWM control operations
Element is closed, to change the pulse width for the drive signal that be supplied to the switch element.
2. power circuit as claimed in claim 1, it is characterised in that each cycle of the PWM operations includes including holding
The armature winding of transformer and the resonant condition of capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710878039.7A CN107846146A (en) | 2017-09-26 | 2017-09-26 | A kind of power circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710878039.7A CN107846146A (en) | 2017-09-26 | 2017-09-26 | A kind of power circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107846146A true CN107846146A (en) | 2018-03-27 |
Family
ID=61661921
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710878039.7A Pending CN107846146A (en) | 2017-09-26 | 2017-09-26 | A kind of power circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107846146A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1636309A (en) * | 2000-11-20 | 2005-07-06 | 皇家菲利浦电子有限公司 | Voltage clamping system and method for a dc/dc power converter |
| CN102097952A (en) * | 2009-12-09 | 2011-06-15 | 株式会社理光 | Power supply unit, image forming apparatus and power supply control method |
| CN102497108A (en) * | 2011-12-26 | 2012-06-13 | 南京航空航天大学 | LLC resonance type push-pull forward conversion topology |
| CN103891123A (en) * | 2011-10-25 | 2014-06-25 | 株式会社村田制作所 | Inverter device |
| CN106208756A (en) * | 2015-05-19 | 2016-12-07 | 英飞凌科技奥地利有限公司 | Temporary power origin system and method |
-
2017
- 2017-09-26 CN CN201710878039.7A patent/CN107846146A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1636309A (en) * | 2000-11-20 | 2005-07-06 | 皇家菲利浦电子有限公司 | Voltage clamping system and method for a dc/dc power converter |
| CN102097952A (en) * | 2009-12-09 | 2011-06-15 | 株式会社理光 | Power supply unit, image forming apparatus and power supply control method |
| CN103891123A (en) * | 2011-10-25 | 2014-06-25 | 株式会社村田制作所 | Inverter device |
| CN102497108A (en) * | 2011-12-26 | 2012-06-13 | 南京航空航天大学 | LLC resonance type push-pull forward conversion topology |
| CN106208756A (en) * | 2015-05-19 | 2016-12-07 | 英飞凌科技奥地利有限公司 | Temporary power origin system and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180327 |
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| WD01 | Invention patent application deemed withdrawn after publication |