CN103066858B - A kind of voltage feedback type half-bridge circuit - Google Patents
A kind of voltage feedback type half-bridge circuit Download PDFInfo
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- CN103066858B CN103066858B CN201310022642.7A CN201310022642A CN103066858B CN 103066858 B CN103066858 B CN 103066858B CN 201310022642 A CN201310022642 A CN 201310022642A CN 103066858 B CN103066858 B CN 103066858B
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Abstract
The invention discloses a kind of voltage feedback type half-bridge circuit, including input circuit, EMI circuit; current rectifying and wave filtering circuit; start-up circuit, protection circuit and higher-order of oscillation inverter circuit, wherein; described input circuit; EMI circuit, current rectifying and wave filtering circuit, start-up circuit; protection circuit and higher-order of oscillation inverter circuit are sequentially connected with, and described higher-order of oscillation inverter circuit is voltage feedback type higher-order of oscillation inverter circuit.The present invention still can work when zero load, uses the present invention can expand the range of half-bridge circuit, can be used for the power supply etc. of low-voltage LED light source or access control system, and practicality is high.
Description
Technical field
The present invention relates to a kind of half-bridge circuit, in particular a kind of voltage feedback type half-bridge circuit.
Background technology
Half-bridge circuit of the prior art is generally current feedback half-bridge circuit, this circuit arranges two vibration windings, an induction coil and a high frequency generator, the electric current by induction coil is made to change by the curent change of high frequency generator, thus affect the curent change in vibration winding, realize current feedback, this circuit operationally must have the load of certain power in outfan connection, the most actually used very inconvenient.The load transformer scope utilizing current feedback half-bridge circuit to make is little, directly limit the range of transformator, and this transformator typically can only be used as the supporting power supply of lamp decoration product.
Therefore, prior art has yet to be improved and developed.
Summary of the invention
It is an object of the invention to provide a kind of voltage feedback type half-bridge circuit, being used for solving half-bridge circuit band of the prior art, to carry scope little, purposes single and in-convenience in use etc. technical problem.
Technical scheme is as follows: a kind of voltage feedback type half-bridge circuit, including input circuit, EMI circuit; current rectifying and wave filtering circuit; start-up circuit, protection circuit and higher-order of oscillation inverter circuit, wherein; described input circuit; EMI circuit, current rectifying and wave filtering circuit, start-up circuit; protection circuit and higher-order of oscillation inverter circuit are sequentially connected with, and described higher-order of oscillation inverter circuit is voltage feedback type higher-order of oscillation inverter circuit.
Described voltage feedback type half-bridge circuit, wherein, described voltage feedback type higher-order of oscillation inverter circuit includes two audions, two vibration windings and a high frequency transformer；Described audion connects one to one with vibration winding respectively, and described vibration winding one end is directly connected with one end of the input coil of high frequency transformer, and the vibration winding other end is connected with the other end of the input coil of high frequency transformer by audion.
Described voltage feedback type half-bridge circuit, wherein, described voltage feedback type higher-order of oscillation inverter circuit includes four audions, two vibration windings and a high frequency transformer；Described audion is divided into two groups, and in same group, audion is connected in parallel；Two groups of audions are connected with two vibration windings respectively, and described vibration winding one end is directly connected with one end of the input coil of high frequency transformer, and the vibration winding other end is connected with the other end of the input coil of high frequency transformer by audion group.
Described voltage feedback type half-bridge circuit, wherein, the emitter and collector of one of them audion described is connected with the collector and emitter of another audion respectively；The emitter stage of said two audion connects the two ends of the input coil of high frequency transformer respectively, said two vibration winding two ends are connected with base stage and the emitter stage of two audions respectively, be in series with coupling electric capacity and drive current-limiting resistance between described vibration winding one end and the base stage of audion.
Described voltage feedback type half-bridge circuit, wherein, is provided with protection module between the base stage and emitter stage of described audion.
Described voltage feedback type half-bridge circuit; wherein; described protection module includes two anti-saturation diodes and a protection inductance; described anti-saturation diode one end is connected with transistor base; the two anti-saturation diode other ends are connected on described coupling electric capacity two ends respectively; described coupling electric capacity one end is connected with vibration winding, and the other end is connected with protection inductance one end, and the described protection inductance other end is connected with transistor emitter.
Described voltage feedback type half-bridge circuit; wherein; described voltage feedback type half-bridge circuit also includes the back discharge diode of two protection audions; said two back discharge diode one end is connected with input coil one end of high frequency transformer, and two back discharge diode other ends are connected with the colelctor electrode of an audion and the emitter stage of another audion respectively；Said two back discharge diode is parallel with back discharge electric capacity respectively.
Described voltage feedback type half-bridge circuit, wherein, described voltage feedback type half-bridge circuit also includes two protection diodes, and said two protects the diode collector and emitter respectively with two audions to be connected.
Beneficial effects of the present invention: the present invention is by arranging two vibration windings, two audions corresponding with vibration winding and a high frequency transformer in electric current, and two vibration windings are directly connected with high frequency transformer, realize voltage feedback type circuit, voltage is still had to export when realizing circuit zero load, expand the range of half-bridge circuit, the present invention is of many uses, can be used for the power supply etc. of low-voltage LED light source or access control system, and practicality is high.
Accompanying drawing explanation
Fig. 1 is the circuit module figure of voltage feedback type half-bridge circuit in the present invention.
Fig. 2 is the circuit diagram of the voltage feedback type higher-order of oscillation inverter circuit of voltage feedback type half-bridge circuit in the present invention.
Detailed description of the invention
For making the purpose of the present invention, technical scheme and advantage clearer, clear and definite, the present invention is described in more detail for the embodiment that develops simultaneously referring to the drawings.
Such as Fig. 1; the present invention includes input circuit, EMI circuit (electromagnetism anti-interference filtration circuit), current rectifying and wave filtering circuit; start-up circuit; protection circuit and higher-order of oscillation inverter circuit, described input circuit, EMI circuit; current rectifying and wave filtering circuit; start-up circuit, protection circuit and higher-order of oscillation inverter circuit are sequentially connected with, and the higher-order of oscillation inverter circuit in the present invention is voltage feedback type higher-order of oscillation inverter circuit.
Such as Fig. 2, it it is the circuit diagram of the voltage feedback type higher-order of oscillation inverter circuit of voltage feedback type half-bridge circuit in the present invention.Figure includes two vibration winding TR-2 and TR-3; two audion N1 and N2; one high frequency transformer; four anti-saturation diodes D6, D7, D8 and D9, two coupling electric capacity C8 and C9, two drive current-limiting resistance R4 and R5; two protection inductance L2 and L3; two back discharge diode D10 and D11, two back discharge electric capacity C10 and C11, two protection diode D13 and D14；High frequency amplifier input coil is TR-1.When being embodied as, it is also possible to four audions of configuration as required.
Vibration winding TR-2, coupling electric capacity C8 and driving current-limiting resistance R4 are connected in series between base stage and the emitter stage of audion N1, form oscillation circuit；Vibration winding TR-3, coupling electric capacity C9 and driving current-limiting resistance R5 are connected in series between base stage and the emitter stage of audion N2, form oscillation circuit.The colelctor electrode of the emitter stage connecting triode N2 of audion N1, the emitter stage of audion N1 is also connected with one end of high frequency amplifier input coil TR-1 simultaneously；The colelctor electrode of audion N1 is connected by the other end of back discharge electric capacity C10 and high frequency amplifier input coil TR-1；The emitter stage of audion N2 is connected with back discharge electric capacity C10 by back discharge electric capacity C11.By above-mentioned connected mode, it is achieved voltage feedback type higher-order of oscillation inverter circuit, when the both end voltage of high frequency transformer input coil TR-1 changes, directly feed back to vibration winding TR-2 or TR-3 by audion N1 or N2.Voltage feedback type half-bridge circuit of the present invention, when outfan does not connects load, still has voltage to export, and can make power supply and use, it is adaptable to the equipment such as the power supply of low-voltage LED light source or access control system.
Further, arranging protection module between the base stage and emitter stage of audion N1 and N2, described protection module includes four anti-saturation diodes D6, D7, D8 and D9, two protection inductance L2 and L3.The base stage of described anti-saturation diode D6 one end connecting triode N1; the other end connects coupling electric capacity C8 and is connected with vibration winding TR-2 one end; the other end of coupling electric capacity C8 connects anti-saturation diode D7 and protection inductance L2; described anti-saturation diode D7 is connected in parallel on driving current-limiting resistance R4 two ends; one end of described protection inductance L2 is connected with driving current-limiting resistance R4, the emitter stage of protection inductance L2 other end connecting triode N1.The base stage of described anti-saturation diode D8 one end connecting triode N2; the other end connects coupling electric capacity C9 and is connected with vibration winding TR-3 one end; the other end of coupling electric capacity C9 connects anti-saturation diode D9 and protection inductance L3; described anti-saturation diode D9 is connected in parallel on driving current-limiting resistance R5 two ends; one end of described protection inductance L3 is connected with driving current-limiting resistance R5, the emitter stage of protection inductance L3 other end connecting triode N2.This protection module not only can protect audion N1 and N2, it is to avoid audion burns out, it is also possible to audion plays anti-saturation effect.
Further, voltage feedback type higher-order of oscillation inverter circuit in the present embodiment also includes two back discharge diode D10 and D11, described back discharge diode D10 is connected in parallel on back discharge electric capacity C10 two ends, and described back discharge diode D11 is connected in parallel on back discharge electric capacity C11 two ends.Audion is played a protective role by back discharge diode D10 and D11, it is to avoid during high frequency transformer outfan short circuit, electric current is excessive burns audion.
In order to protect audion N1 and N2 further, prevent audion to be reversed voltage breakdown or damage, be connected to respectively protect diode D13 and D14 between the collector and emitter of audion N1 and N2.
In actual application, can connect one output feedback capacity C13 between the colelctor electrode of the outfan of high frequency transformer and audion N1, beneficially regulate output voltage by output voltage, it is to avoid output voltage is excessive to be caused output voltage excessive and burn out equipment.
The present invention is by arranging two vibration windings, two audions corresponding with vibration winding and a high frequency transformer in electric current, and two vibration windings are directly connected with high frequency transformer, realize voltage feedback type circuit, voltage is still had to export when realizing circuit zero load, expand the range of half-bridge circuit, the present invention is of many uses, can be used for the power supply etc. of low-voltage LED light source or access control system, and practicality is high.In actual production, by two vibration winding TR-2 and TR-3 are integrated on high frequency transformer TR-1, on the one hand realizing Voltage Feedback, the band increasing transformator carries scope, on the other hand can reduce the volume of transformer finished products, facilitate client to use.
It should be appreciated that the application of the present invention is not limited to above-mentioned citing, for those of ordinary skills, can be improved according to the above description or convert, all these modifications and variations all should belong to the protection domain of claims of the present invention.
Claims (4)
1. a voltage feedback type half-bridge circuit, including input circuit, EMI circuit; current rectifying and wave filtering circuit; start-up circuit, protection circuit and higher-order of oscillation inverter circuit, it is characterised in that; described input circuit; EMI circuit, current rectifying and wave filtering circuit, start-up circuit; protection circuit and higher-order of oscillation inverter circuit are sequentially connected with, and described higher-order of oscillation inverter circuit is voltage feedback type higher-order of oscillation inverter circuit；
Described voltage feedback type higher-order of oscillation inverter circuit includes the first audion, the second audion, the first vibration winding, the second vibration winding and high frequency transformer；The emitter stage of described first audion and the colelctor electrode of the second audion connect, and the colelctor electrode of described first audion and the emitter stage of the second audion connect；The emitter stage of described first audion and the second audion connects the two ends of the input coil of high frequency transformer respectively, described first vibration winding two ends are connected with base stage and the emitter stage of the first audion respectively, and described second vibration winding two ends are connected with emitter stage and the base stage of the second audion respectively；It is in series with coupling electric capacity between described first, second vibration winding one end and the base stage of first, second audion and drives current-limiting resistance；The first described vibration windings in series is between the base stage and emitter stage of the first audion, described second vibration windings in series is between the base stage and emitter stage of the second audion, described first vibration winding one end is directly connected with one end of the input coil of high frequency transformer, the first vibration winding other end is connected with the other end of the input coil of high frequency transformer by colelctor electrode one end of the first audion, described second vibration winding one end is directly connected with the other end of the input coil of high frequency transformer, the second vibration winding other end is connected with one end of the input coil of high frequency transformer by colelctor electrode one end of the second audion；
Wherein, described voltage feedback type half-bridge circuit also includes the back discharge diode of two protection audions; said two back discharge diode one end is connected with input coil one end of high frequency transformer, and two back discharge diode other ends are connected with the colelctor electrode of the first audion and the emitter stage of the second audion respectively；Said two back discharge diode is parallel with back discharge electric capacity respectively.
Voltage feedback type half-bridge circuit the most according to claim 1, it is characterised in that be provided with protection module between base stage and the emitter stage of the first or second audion.
Voltage feedback type half-bridge circuit the most according to claim 2; it is characterized in that; described protection module includes two anti-saturation diodes and a protection inductance; described anti-saturation diode one end is connected with transistor base; the two anti-saturation diode other ends are connected on coupling electric capacity two ends respectively; described coupling electric capacity one end is connected with vibration winding, and the other end is connected with protection inductance one end, and the described protection inductance other end is connected with transistor emitter.
Voltage feedback type half-bridge circuit the most according to claim 1, it is characterised in that described voltage feedback type half-bridge circuit also includes two protection diodes, said two protects the diode collector and emitter respectively with first, second audion to be connected.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310022642.7A CN103066858B (en) | 2013-01-22 | 2013-01-22 | A kind of voltage feedback type half-bridge circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310022642.7A CN103066858B (en) | 2013-01-22 | 2013-01-22 | A kind of voltage feedback type half-bridge circuit |
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| CN103066858A CN103066858A (en) | 2013-04-24 |
| CN103066858B true CN103066858B (en) | 2016-09-07 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2660780Y (en) * | 2003-11-24 | 2004-12-01 | 郑清吉 | Electronic transformer |
| CN202150984U (en) * | 2011-07-04 | 2012-02-22 | 上海明岱电子电器有限公司 | High power factor electronic ballast |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009176522A (en) * | 2008-01-23 | 2009-08-06 | Senseki Koden Kagi Kofun Yugenkoshi | Dimming circuit of discharge lamp |
| CN201830511U (en) * | 2010-09-03 | 2011-05-11 | 北京朗波尔光电股份有限公司 | High-frequency electronic transformer for low-voltage high-power light emitting diode (LED) spot lamp |
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- 2013-01-22 CN CN201310022642.7A patent/CN103066858B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2660780Y (en) * | 2003-11-24 | 2004-12-01 | 郑清吉 | Electronic transformer |
| CN202150984U (en) * | 2011-07-04 | 2012-02-22 | 上海明岱电子电器有限公司 | High power factor electronic ballast |
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| CN103066858A (en) | 2013-04-24 |
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