CN85103829A - Switching elements with the through-flow code converter of free oscillation - Google Patents
Switching elements with the through-flow code converter of free oscillation Download PDFInfo
- Publication number
- CN85103829A CN85103829A CN85103829.8A CN85103829A CN85103829A CN 85103829 A CN85103829 A CN 85103829A CN 85103829 A CN85103829 A CN 85103829A CN 85103829 A CN85103829 A CN 85103829A
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- China
- Prior art keywords
- switching elements
- switching transistor
- transformer
- voltage
- electric capacity
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Abstract
The invention relates to switching elements, it has and input ac voltage (UE) is become the rectifier (BG) of direct voltage (UG) and one contains switching transistor (T
1) and transformer () inverter.According to the invention inverter be one free-running, through-flow type inverter, wherein switching transistor (T
1) be not switched under the current status having.
Description
Switching elements is in very large range made power supply at present and is used, with the power supply of 50Hz mutually, it is easier to make, still less, more cheap.
General known switching elements has transformer, and its primary coil can pass through the switching transistor stored energy, and from a winding of its secondary side or a plurality of winding energy is taken out with the form of one or more constant voltage.Transformer is the part of through-flow code converter or obstructive type converter.The structure of this quasi-converter and principle all by Joo, chim W ü tehule work, have been done detailed description in the chapter 2.1 of the book of being sold by ε Xnpert publishing house in 1979 " switching elements ".
The switching elements major part is operated in 16 to 50KHz the frequency range.Because electric current present, voltage curve has big upper punch composition, must close and connect big electric current in addition, and therefore high voltage will consider to produce in (long wave) frequency range significant the interference more than 150KHz.Because interference may be diffused in the common network or the width of cloth is mapped to the space, therefore the interfering frequency characteristic there is relevant regulation.
In order to be suppressed at asymmetric interference voltage in the electrical network, in Switching Power Supply, has shielding between the primary and secondary of transformer.Shielding can be made up of the Copper Foil that insulation is placed on the elementary winding.Obstructive type inverter power supply parts have a transformer that has air-gap, when high-power in the iron core of transformer and shielding the big eddy current loss of generation.Therefore (see W ü △ te hube works) in the ordinary course of things, be not to use Copper Foil but use a so-called traverse net, make like this transformer that uses for the obstructive type converter so spend money, costliness.
Known through-flow code converter has in fact by fixed frequency control, cycling switching transistor, and not having the transformer that air-gap is arranged, its elementary winding is placed on the collector loop of switching transistor, and takes out direct voltage at secondary winding by rectifier.Because circuit is with given switching frequency work, so switching transistor ON time point has been determined in advance under the sort circuit principle.Schematic circuit has shortcoming like this; switching transistor is switched on when electric current is arranged; fly-wheel diode changes blocking state into when electric current is arranged in the secondary side loop; this produces high radio interference voltage on the electrical network lead; use this inverter circuit in the message instrument of in mechanics of communication, using; and carry out electric current when isolating according to protection level 2, when promptly not making property-line, these instruments do not have the elimination interference performance on the maximum boundary value interference level of desired category-B.
The task of invention is to provide a kind of switching elements of isolating electric current, small disturbing pulse only occurs during use on the connection lead, and it has the transformer of a small eddy current loss.
This task can creatively solve by the described technical characterictic of characteristic in claim 1.
Be that according to the advantage of inventing the switching elements of making because collector current is a triangular wave, inverter goes to disturb easily.
Thus, switching transistor is not connected when having electric current, and switching loss has reduced.
Thus, the switching power source device of being done according to invention has only a through-flow code converter, for the elementary winding of shielded transformer, only need use an easily metallic film of processing.
According to an embodiment shown in the accompanying drawings invention is described below.
Switching elements shown in the figure is a through-flow code converter, and input ac voltage UE is added in its two input E
1And E
2On.Bridge type rectification circuit BG makes 1 and 2 ends present direct voltage UG to alternating voltage UE rectification, and holding 1 opposite end 2 is positive potentials.Direct voltage UG is connected on end 1 and holds capacitor C between 2
1Filter is flat.In addition by resistance R
1And R
2The series circuit of forming reaches by elementary winding W
1, switching transistor T
1The series circuit of collector electrode emitting stage road through forming all be attempted by end 1 and hold between 2, one does not mark specially, resistance R
1And resistance R
2Between dividing point and the base stage of switching transistor link.
Transformer
Comprised elementary winding W
1, degaussing winding W
2, control winding W
3With secondary winding W
4Elementary winding W
1With secondary winding W
2Polarity identical, control winding W
3With degaussing winding W
4Polarity opposite with them.Degaussing winding W
2With diode D
1Polyphone is connected on end 1 and holds between 2, and wherein the negative electrode of diode and end 1 link.
At switching transistor T
1Base stage and hold 2 between be connected to oxide-semiconductor control transistors T
2The collector emitter branch road.Oxide-semiconductor control transistors T
2Base stage pass through capacitor C
3, by by resistance R
4With control winding W
3Link with end 2.Resistance R
4With diode D
2Be in parallel the anode of diode and oxide-semiconductor control transistors T
2Base stage connect connection, and its negative electrode is by by capacitor C
2And resistance R
3The series circuit and the switching transistor T that form
1Base stage link.
Resistance R
3And capacitor C
2Acting in conjunction control switch transistor T
1Conducting state, and capacitor C
3And resistance R
4And diode D
2The control switch transistor T
1Closed condition.
Secondary winding W
4An end by rectifier diode D
3Inductance coil L and output terminals A
1Link.Secondary winding W
4The other end directly and output terminals A
2Link.Output terminals A
2Again through a sustained diode
2Negative electrode along its rectification direction and rectifier diode links, and puts down in output terminals A in order to filter
1A
2On the output dc voltage UA that obtains, between terminal, be connected to capacitor C
4, at terminal A
1A
2Between also be associated with a load resistance RL, outer user of its symbolic expression.
The working method of switching elements will be described below.
Through the AC-input voltage UE of over commutation, promptly direct voltage UG is through the elementary winding W of transformer
1, be reverse into voltage under the switching transistor with certain frequency.When connecting Switching Power Supply, capacitor C
2Pass through resistance R
1, R
3With control winding W
3Charging.When reaching switching transistor T
1The threshold voltage of base stage the time, it begins conducting, through-flow code converter is started working.
As switching transistor T
1When being in conducting phase, energy is sent to transformer
Primary side, rectifier diodes D simultaneously
3Admittance and sustained diode
2Be closed, the direct current by passing through in inductance L can be implemented in capacitor C like this
4Last taking-up output dc voltage.When current flowing, load resistance R not only
LAbsorb energy, inductance also is so, and it is stored as magnetic energy.Current peak in primary coil is by inductance L, the loss resistance sum in the primary and secondary loop, switching transistor T
1ON time and output dc voltage UA determine.Equally at switching transistor T
1Conducting state the time, at transformer
The primary side capacitor C
3By control winding W
3The inductance current resistance R of flowing through
4Charging is at capacitor C
3Be charged to control transistor T
2The base stage threshold voltage time, it is with the conducting of pulsed ground, transistor T
1Close, like this switching transistor T
1ON time in fact by resistance R
4And capacitor C
3The time constant that forms has determined.At switching transistor T
1Dwell period, be negative voltage at the current potential of the relative bridge rectifier BG of its base stage end 2, the base voltage upset is because control winding W under the switching transistor
3The voltage upset causes.The pass closed procedure of switching transistor is introduced by oxide-semiconductor control transistors, and by control winding W
3When degaussing, keeping always.
At transistor T
1The switching stage, at transformer
Secondary coil side rectifier diode D
3Reverse bias, thereby do not have electric current.Owing to stored energy in the inductance L, electric current continues by inductance in same direction, load resistance RL and the fly-wheel diode that begins conducting until now.
Magnetic energy in that the switching transistor conducting phase is absorbed by transformer core passes through degaussing coil W at the switching transistor dwell period
2With diode D
1Flow back to voltage source, promptly flow back to capacitor C
1At transformer
After the degaussing and do not have a switching transistor T under the state of electric current at fly-wheel diode
1Restart admittance, at the switching transistor dwell period, the negative voltage that its base stage presents removes after degaussing.Pass through resistance R
3With control winding W
3Capacitor C
2Again charging, switching transistor reenters conducting phase.At switching transistor T
1When dwell period begins, diode D
2Make C
3Discharge rapidly.
Be not determine switching transistor T in advance according to the thought of inventing the Switching Power Supply of being done
1ON time and its switching frequency, at transformer
There is not under the state of electric current switching transistor T with fly-wheel diode after the degaussing
1Again with conducting voluntarily.Switching transistor T like this
1Not when electric current is arranged, to connect, in elementary level loop, flowing like this and eliminating the triangular waveform collector current that disturbs easily.
Switching transistor T in switching elements of the present invention
1Connect in the given time, after turn-on time, promptly in the transformer degaussing of switching transistor down periods, after degaussing, and in sustained diode
4Switching transistor T when not having electric current
1Again conducting utilizes control winding W
3Can know that in fact demagnetization finishes.
Any adjustable thyristor can be as switching transistor T
1In Switching Power Supply of the present invention, use.
The label detail list
T
1Switching transistor
T
2Oxide-semiconductor control transistors
W
1Elementary winding
W
2The demagnetization winding
W
3The control winding
W
4Secondary winding
Transformer
The BG bridge rectifier
UE input alternating voltage
UA output alternating voltage
D
1D
2Diode
D
3Rectifier diode
D
4Fly-wheel diode
The L inductance
The RL load resistance
E
1E
2Input
A
1A
2Output
The UG direct voltage
C
1To C
4Electric capacity
R
1To R
4Resistance
Errata
CPEL855259
Errata
CPEL855259
Errata
CPEL855259
Claims (7)
1, switching elements has a rectifier (BG) that input voltage (UE) is become direct voltage (UG), and one contains switching transistor (T
1) with the inverter of transformer, it is characterized in that: inverter is by free-running through-flow type inverter, wherein switching transistor (T
1) be to connect under the state of electric current not having.
According to the switching elements of claim 1, it is characterized in that 2, the part of direct voltage (UG) is added in switching transistor (T
1) base stage, transformer
Has a control winding (W
3), switching transistor (T
1) conducting controlled stage circuit and closing control level circuit arranged, use the demagnetization transformer (
) time, switching transistor is by conducting controlled stage circuit and control winding (W
3) be switched on, and after controlled ON time, by closing control level circuit flow through control winding (W
3) inductive current close again.
3, according to the switching elements of claim 1 or 2, it is characterized in that: conducting controlled stage circuit is by a resistance (R
3) and electric capacity (C
2) be composed in series.
4, according to any switching elements in the claim 1 to 3, it is characterized in that: closing control circuit is by oxide-semiconductor control transistors (T
2) electric capacity (C
3) and resistance (R
4) form, the on-time is by resistance (R
4) and electric capacity (C
3) decision.
5, according to any switching elements in the claim 1 to 4, it is characterized in that: diode (D
2) and resistance (R
4) parallel connection, can make capacitor C
3At transformer
When beginning, demagnetization discharges rapidly.
6, according to any switching elements in the claim 1 to 4, it is characterized in that: the DC-to-AC converter secondary side has direct current rectifier diode (D
3), continuous number diode (D
4) and an electric capacity (C
4), electric capacity (C wherein
4) be used for the output voltage that flat ripple obtains, and two diode (D
3, D
4) as producing and keep output dc voltage (UA).
7, according to the switching elements of claim 6, it is characterized in that: at secondary side electric capacity (C
4) the preceding inductance that is connected to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85103829 CN1009787B (en) | 1985-05-11 | 1985-05-11 | Switching elements of free oscillatory passage converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85103829 CN1009787B (en) | 1985-05-11 | 1985-05-11 | Switching elements of free oscillatory passage converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85103829A true CN85103829A (en) | 1986-11-05 |
| CN1009787B CN1009787B (en) | 1990-09-26 |
Family
ID=4793464
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 85103829 Expired CN1009787B (en) | 1985-05-11 | 1985-05-11 | Switching elements of free oscillatory passage converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1009787B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1074604C (en) * | 1998-08-20 | 2001-11-07 | 深圳市安圣电气有限公司 | Zero-switching loss switching voltage regulator |
| CN107481838A (en) * | 2015-03-04 | 2017-12-15 | 江苏理工学院 | Switch transformer assembly with primary coil and switch power supply |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2283947Y (en) * | 1996-09-02 | 1998-06-10 | 江智煌 | Power supply device |
-
1985
- 1985-05-11 CN CN 85103829 patent/CN1009787B/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1074604C (en) * | 1998-08-20 | 2001-11-07 | 深圳市安圣电气有限公司 | Zero-switching loss switching voltage regulator |
| CN107481838A (en) * | 2015-03-04 | 2017-12-15 | 江苏理工学院 | Switch transformer assembly with primary coil and switch power supply |
| CN107481838B (en) * | 2015-03-04 | 2020-05-01 | 江苏理工学院 | Switch transformer assembly with primary coil and switch power supply |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1009787B (en) | 1990-09-26 |
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| SE01 | Entry into force of request for substantive examination | ||
| C13 | Decision | ||
| C14 | Grant of patent or utility model | ||
| C19 | Lapse of patent right due to non-payment of the annual fee |