CN203423625U - Pulse transformer coupling parallel switch mode LED display voltage stabilizing circuit - Google Patents
Pulse transformer coupling parallel switch mode LED display voltage stabilizing circuit Download PDFInfo
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- CN203423625U CN203423625U CN201320543576.3U CN201320543576U CN203423625U CN 203423625 U CN203423625 U CN 203423625U CN 201320543576 U CN201320543576 U CN 201320543576U CN 203423625 U CN203423625 U CN 203423625U
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Abstract
The utility model discloses a pulse transformer coupling parallel switch mode LED display voltage stabilizing circuit. The pulse transformer coupling parallel switch mode LED display voltage stabilizing circuit comprises a sampling circuit, a comparison amplifier, a pulse width circuit, a resistor R1, a capacitor C1, a diode VT1, a diode VD1 and a pulse transformer T1, wherein an inductor L1 of the pulse transformer T1 is connected with the pulse width circuit through the diode VT1, the pulse width circuit is connected with the sampling circuit through the comparison amplifier, one end of an inductor L2 of the pulse transformer T1 is connected with one end of the capacitor C1, the sampling circuit and one end of the resistor R1 through the diode VD1, the other end of the resistor R1 is in grounding connection, and the other end of the inductor L2 of the pulse transformer T1 and the other end of the capacitor C1 are connected and are in grounding connection. The pulse transformer coupling parallel switch mode LED display voltage stabilizing circuit employs the pulse coupling transformer, an alternating current electrical network and a load circuit of the voltage stabilizing circuit are isolated, a circuit of a secondary winding loop of the pulse transformer is a cold base board, and debugging and maintenance are convenient.
Description
technical field
The utility model relates to light-emitting diode display voltage stabilizing circuit, especially a kind of pulse transformer coupling paralleling switch type light-emitting diode display voltage stabilizing circuit.
background technology
Pulse transformer has the characteristic of common transformer, and just operating current is pulse current.Pulse transformer is a kind of broadband transformer.Pulse transformer, because mainly consider that waveform transmits problem.Even if be equally wide band transformer, but as long as waveform can meet design requirement, magnetic core also can be operated in nonlinear area.Therefore, its profile can be done little more much with transformer than communication.Also have, except passing through highpowerpulse, the loss of transformer is generally also little.Therefore, the size of the magnetic core of getting depends on that when pulse is passed through, whether magnetic flux is saturated, or depends on whether the temperature rise that iron loss causes surpasses permissible value.
In switching mode voltage stabilizing circuit, adjust pipe and be operated on off state, thereby power consumption is little, circuit efficiency is high, and parallel is one of basic switch change-over pattern.
summary of the invention
The purpose of this utility model is to provide a kind of pulse transformer coupling paralleling switch type light-emitting diode display voltage stabilizing circuit that adds a pulse transformer on paralleling switch type voltage stabilizing circuit, the function of stablizing light-emitting diode display voltage is provided, and pulse transformer is comprised of winding, secondary winding and a positive feedback winding.
The utility model solves the technical scheme that its technical problem adopts:
Pulse transformer coupling paralleling switch type light-emitting diode display voltage stabilizing circuit, it is characterized in that comprising: sample circuit, comparison amplifier, pulse width modulation circuit, resistance R 1, capacitor C 1, diode VT1, diode VD1, pulse transformer T1, the inductance L 1 of pulse transformer T1 is connected with pulse width modulation circuit by diode VT1, pulse width modulation circuit is connected with sample circuit by comparison amplifier, inductance L 2 one end of pulse transformer T1 are by one end of diode VD1 and capacitor C 1, sample circuit, one end of resistance R 1 is connected, the other end ground connection of resistance R 1, inductance L 2 other ends of pulse transformer T1 are connected with the other end of capacitor C 1 and ground connection, the inductance L 3 of pulse transformer T1 is connected with sample circuit, sample circuit ground connection.
The beneficial effects of the utility model are: in paralleling switch type voltage stabilizing circuit, adopt pulse-couple transformer, between AC network and the load circuit of voltage stabilizing circuit, isolate, the circuit in pulse transformer secondary winding loop is cold base plate, for debugging and repairing provide convenience.
accompanying drawing explanation
In conjunction with the accompanying drawings and embodiments the utility model is further illustrated.
Fig. 1 is design philosophy theory diagram of the present utility model.
Fig. 2 is the circuit diagram of the utility model pulse transformer coupling paralleling switch type voltage stabilizing circuit.
embodiment
Principle of the present utility model is that paralleling switch type voltage stabilizing circuit adds pulse transformer to form pulse transformer coupling paralleling switch type voltage stabilizing circuit.
As shown in Figure 2, pulse transformer coupling paralleling switch type light-emitting diode display voltage stabilizing circuit, it is characterized in that comprising: sample circuit, comparison amplifier, pulse width modulation circuit, resistance R 1, capacitor C 1, diode VT1, diode VD1, pulse transformer T1, the inductance L 1 of pulse transformer T1 is connected with pulse width modulation circuit by diode VT1, pulse width modulation circuit is connected with sample circuit by comparison amplifier, inductance L 2 one end of pulse transformer T1 are by one end of diode VD1 and capacitor C 1, sample circuit, one end of resistance R 1 is connected, the other end ground connection of resistance R 1, inductance L 2 other ends of pulse transformer T1 are connected with the other end of capacitor C 1 and ground connection, the inductance L 3 of pulse transformer T1 is connected with sample circuit, sample circuit ground connection.
The utility model is many pulse transformer T1 in paralleling switch type voltage stabilizing circuit.Inductance L 1, inductance L 2, inductance L 3 has formed pulse transformer T1, wherein inductance L 1 is energy storage inductor, for a winding of pulse transformer T1, inductance L 2 is secondary winding of pulse transformer T1, and inductance L 3 is positive feedback windings, be used for starting switch diode, when switching on power, allow diode VT1 enter conducting state, diode VT1 is switching diode, and diode VD1 is impulse commutation diode, capacitor C 1 is filter capacitor, and resistance R 1 is the load resistance of voltage stabilizing circuit.
The effect of sample circuit is that the direct voltage size variation of voltage stabilizing circuit output is measured to sample out, then sampling voltage is sent into comparison amplifier circuit.The DC voltage change amount of taking out from sample circuit, the situation of the large minor swing of reaction voltage stabilizing circuit VD.
The effect of comparison amplifier is that two input voltages are compared.Two signals of input comparison amplifier are sampling voltage and reference voltage, and these two signals compare in comparison amplifier, when result relatively has error, and comparison amplifier output error voltage.
Pulse width modulation circuit is used for controlling diode VT1 conducting and cut-off, by the output voltage size of diode VT1 control switch voltage stabilizing circuit, regulated output voltage.
Pulse transformer T1 has the characteristic of common transformer, and just operating current is pulse current.Its course of work is described below:
(1) diode VT1 base stage switching pulse is between high period, diode VT1 conducting, the electric current that input voltage Ui produces forms loop by collector electrode, the emitter of the diode VT1 of inductance L 1 and conducting, and now by electric energy, the form with magnetic energy is stored in inductance L 1.From circuit, the Same Name of Ends mark of inductance L 1 and inductance L 2 can be known, due to the current collection of diode VT1 low level very, so diode VD1 is low level just very, diode VD1 cut-off, provides direct-current working volts by the stored electric energy of capacitor C 1 for load circuit during this.
(2) the base stage switching pulse of diode VT1 is between low period, diode VT1 cut-off, inductance L 1 produces inverse electromotive force, its polarity be upper negative under just, this pulse voltage is by transformer coupled to inductance L 2, its polarity is upper just lower bearing, this electromotive force makes diode VD1 forward bias and conducting, the electric current that electromotive force produces flows through diode VD1, to capacitor C 1 charging, completes the process that the magnetic energy in inductance L 1 is converted to the electric energy in capacitor C 1 during this.
Claims (1)
1. pulse transformer coupling paralleling switch type light-emitting diode display voltage stabilizing circuit, it is characterized in that comprising: sample circuit, comparison amplifier, pulse width modulation circuit, resistance R 1, capacitor C 1, diode VT1, diode VD1, pulse transformer T1, the inductance L 1 of pulse transformer T1 is connected with pulse width modulation circuit by diode VT1, pulse width modulation circuit is connected with sample circuit by comparison amplifier, inductance L 2 one end of pulse transformer T1 are by one end of diode VD1 and capacitor C 1, sample circuit, one end of resistance R 1 is connected, the other end ground connection of resistance R 1, inductance L 2 other ends of pulse transformer T1 are connected with the other end of capacitor C 1 and ground connection, the inductance L 3 of pulse transformer T1 is connected with sample circuit, sample circuit ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320543576.3U CN203423625U (en) | 2013-09-03 | 2013-09-03 | Pulse transformer coupling parallel switch mode LED display voltage stabilizing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320543576.3U CN203423625U (en) | 2013-09-03 | 2013-09-03 | Pulse transformer coupling parallel switch mode LED display voltage stabilizing circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203423625U true CN203423625U (en) | 2014-02-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320543576.3U Expired - Fee Related CN203423625U (en) | 2013-09-03 | 2013-09-03 | Pulse transformer coupling parallel switch mode LED display voltage stabilizing circuit |
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| CN (1) | CN203423625U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107306086A (en) * | 2016-04-22 | 2017-10-31 | 德州仪器德国股份有限公司 | DC/DC converters |
-
2013
- 2013-09-03 CN CN201320543576.3U patent/CN203423625U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107306086A (en) * | 2016-04-22 | 2017-10-31 | 德州仪器德国股份有限公司 | DC/DC converters |
| CN107306086B (en) * | 2016-04-22 | 2020-12-08 | 德州仪器德国股份有限公司 | DC/DC converter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140205 Termination date: 20170903 |