CN1050625A - Self-excitation switching mode voltage stablizer - Google Patents
Self-excitation switching mode voltage stablizer Download PDFInfo
- Publication number
- CN1050625A CN1050625A CN 90106164 CN90106164A CN1050625A CN 1050625 A CN1050625 A CN 1050625A CN 90106164 CN90106164 CN 90106164 CN 90106164 A CN90106164 A CN 90106164A CN 1050625 A CN1050625 A CN 1050625A
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- CN
- China
- Prior art keywords
- switching tube
- turn
- self
- controllable silicon
- mode voltage
- 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.)
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Abstract
A kind of self-excitation switching mode voltage stablizer is made up of input rectifying filtering circuit, switch transformer, switching tube and control circuit thereof and output rectifier and filter, it is characterized in that switching tube does not rely on positive feedback to turn-off voluntarily, but by shutoff signal that the controllable silicon conducting produced through electric capacity or transformer coupled to switching tube base stage and it is turn-offed by force.The present invention can be used for various self-excitation switching mode voltage stablizers.
Description
The present invention is a self-excitation switching mode voltage stablizer.
Existing self-excitation switching mode voltage stablizer generally all is to rely on positive feedback conducting and positive feedback to turn-off.Rely on the electric current of positive feedback on-off switching tube that two shortcomings are arranged: the energy loss that 1. will increase turn off process.Because in order to reduce interference, often need to adopt buffer circuit, so that switching tube collector voltage when turn-offing slowly rises.Because the voltage on the tickler is directly proportional with the voltage on the transformer, so the slow rising of collector voltage must cause the slow decline of base voltage, this just makes the collector current turn-off time prolong, and turn-off power loss increases.2. rely on positive feedback to turn-off, make switching tube can't avoid the explosive area of second breakdown.Though because buffer circuit can make collector voltage rise slowly, collector current decline meanwhile also slows down thereupon,, make it to still have the danger of second breakdown so switching tube will pass through high voltage, big Current Zone.
Purpose of the present invention will overcome above shortcoming exactly, makes self-excitation switching mode voltage stablizer in the slow rising of switching tube collector voltage, and collector current still can turn-off rapidly, thereby reduces switching loss, and makes switching tube avoid the explosive area of second breakdown.
Self-excitation switching mode voltage stablizer of the present invention is made up of output rectifier and filter, switch transformer, switching tube and control circuit thereof and output rectifier and filter.It is characterized in that switching tube does not rely on positive feedback to turn-off voluntarily, but switching tube is turn-offed by force by the silicon controlled conducting.The silicon controlled ON time is then controlled by sampling amplification circuit.
The invention has the advantages that it has nothing to do the shutoff of switching tube collector current in the self-activated switch power supply and the speed of collector voltage rising.Under the slow situation about rising of collector voltage, the electric current of collector still can turn-off rapidly.Measurement points out that behind employing the present invention, when collector current turn-offed fully, collector voltage rose less than 10% of peak value, has so both reduced the energy loss of switching process, had eliminated the danger of switching tube generation second breakdown simultaneously again.In addition, adopt the controllable silicon on-off switching tube with usually between switching tube base stage and emitter a triode in parallel make switching tube withdraw from the saturation region as variable resistor to turn-off by positive feedback then and compare, the former control is more rapid effective.So the Switching Power Supply that adopts the present invention to make has extremely wide voltage stabilized range, the comparable general integrated three-terminal regulator of AC ripple is littler, reaches below the 1mV.
Accompanying drawing is the electrical schematic diagram of a kind of embodiment of the present invention.BG among the figure
1Be switching tube, T is a switch transformer, L
1Be the positive feedback coil, SCR is a controllable silicon.The circuit working principle is as follows: power after bridge rectifier filtering road work of alternating current, R
3Bias current is provided, when SCR does not work, L
1On feedback voltage pass through R
1Through capacitor C
1Be coupled to BG
1Base stage, form self-sustained oscillation, D
1For base current provides DC channel, to replenish the electric charge that base current is taken away.At BG
1During conducting, A point current potential is for just, if SCR conducting this moment, the A point voltage will descend suddenly, produces one and turn-offs signal, and this shutoff signal passes through C
1Be coupled to BG
1Base stage, make switching tube BG
1Turn-off immediately.BG
2Efferent duct for the sampling amplification.The ON time of SCR also is switching tube BG
1Turn-off time controlled by it.C
2Be timing capacitor, D
2Be clamp diode, R
2Be compensating resistance.
The shutoff signal that controllable silicon produces also can be sent to the base stage of switching tube by transformer or photoelectrical coupler, makes its shutoff.Principle of work is with last identical.
Also available triggering element or the element circuit with similar characteristics of controllable silicon in the circuit replaces.
Claims (4)
1, a kind of self-excitation switching mode voltage stablizer, form by input rectifying filtering circuit, switch transformer, switching tube and control circuit thereof and output rectifier and filter, it is characterized in that switching tube does not rely on positive feedback to turn-off voluntarily, but the shutoff signal that produces by the controllable silicon conducting is through being capacitively coupled to the base stage of switching tube, and it is turn-offed by force, the silicon controlled conducting is then controlled by sampling amplification circuit.
2, power supply according to claim 1 is characterized in that shutoff signal that the controllable silicon conducting produces is not by electric capacity but by transformer coupled base stage to switching tube it is turn-offed by force.
3, power supply according to claim 1 is characterized in that shutoff signal that the controllable silicon conducting produces is not by electric capacity but by the base stage that photoelectrical coupler is sent to switching tube it is turn-offed by force.
4, as power supply as described in the claim 1,2,3, turn-offing signal is not to be produced by controllable silicon, but produce by triggering element with similar characteristics or element circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90106164 CN1050625A (en) | 1990-10-17 | 1990-10-17 | Self-excitation switching mode voltage stablizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90106164 CN1050625A (en) | 1990-10-17 | 1990-10-17 | Self-excitation switching mode voltage stablizer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1050625A true CN1050625A (en) | 1991-04-10 |
Family
ID=4879861
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90106164 Pending CN1050625A (en) | 1990-10-17 | 1990-10-17 | Self-excitation switching mode voltage stablizer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1050625A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1067187C (en) * | 1994-09-03 | 2001-06-13 | 黄得泰 | Self excited switch source with overcurrent protection |
| CN100454739C (en) * | 2004-05-18 | 2009-01-21 | 上海美芝欧加电器有限公司 | Self-exciting switching power supply |
-
1990
- 1990-10-17 CN CN 90106164 patent/CN1050625A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1067187C (en) * | 1994-09-03 | 2001-06-13 | 黄得泰 | Self excited switch source with overcurrent protection |
| CN100454739C (en) * | 2004-05-18 | 2009-01-21 | 上海美芝欧加电器有限公司 | Self-exciting switching power supply |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |