CN202150806U - AC input miniwatt isolation fixed output high-voltage power supply circuit - Google Patents
AC input miniwatt isolation fixed output high-voltage power supply circuit Download PDFInfo
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- CN202150806U CN202150806U CN201120270967U CN201120270967U CN202150806U CN 202150806 U CN202150806 U CN 202150806U CN 201120270967 U CN201120270967 U CN 201120270967U CN 201120270967 U CN201120270967 U CN 201120270967U CN 202150806 U CN202150806 U CN 202150806U
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Abstract
The utility model relates to an AC input miniwatt isolation fixed output high-voltage power supply circuit, comprising an output rectification filter circuit, an input rectification filter circuit, a switch control and driving circuit and an output high voltage feedback circuit, wherein the switch control and driving circuit is respectively connected with the input rectification filter circuit, the output high voltage feedback circuit and the output rectification filter circuit, and the output rectification filter circuit is connected with the output high voltage feedback circuit. Beneficial effects of the high-voltage power supply circuit are that supply voltage scope is wide, and both AC and DC are available; the peripheral circuit is simple, few components are used, and manufacturing is easy; and miniaturization of the AC power supply miniwatt high-voltage power supply is realized while guaranteeing the main technical index parameters of the high-voltage power supply, thereby providing convenience for PCB design and modular production.
Description
Technical field
The utility model relates to a kind of interchange input small-power that is mainly used in fields such as industry, agricultural, national defence, scientific research and medical treatment and isolates fixing output high-voltage power circuit.
Background technology
Low-power high-voltage power supply product on the market, great majority are direct current supply, because direct current supply power volume than Alternating Current Power Supply can reduce a lot, and work is more safe and reliable.The volume of traditional Alternating Current Power Supply low-power high-voltage power supply is generally bigger on the market, and job security, reliability are relatively poor, and is along with development in science and technology, more and more to the demand of Alternating Current Power Supply high voltage source.
Summary of the invention
In order to adapt to development, to meet the need of market, the utility model provides the interchange input small-power that a kind of high pressure output stability is good, machine volume is little, simple and practical and safe and reliable to isolate fixing output high-voltage power circuit.
The utility model is for realizing above-mentioned purpose; The technical scheme of being taked is: a kind of interchange input small-power is isolated fixing output high-voltage power circuit; Comprise output rectifier and filter; It is characterized in that: also comprise input rectifying filter circuit, switch control and drive circuit, output high pressure feedback circuit; Said switch control and drive circuit are connected with input rectifying filter circuit, output high pressure feedback circuit, output rectifier and filter respectively, and said output rectifier and filter is connected with output high pressure feedback circuit; In the said input rectifying filter circuit; Supply and AC input L connects the positive pole of diode D1 and the negative pole of diode D3 respectively; Supply and AC input N connects the positive pole of diode D2 and the negative pole of diode D4 respectively through resistance R 1, connects the positive pole of capacitor C 1 and capacitor C 3 after the negative pole of diode D1 and diode D2 links to each other respectively, and resistance R 2 is parallelly connected with inductance L 1; After linking to each other, the positive pole of diode D3 and diode D4 connects the negative pole of capacitor C 2 and an end of inductance L 1 respectively; The negative pole of another termination capacitor C 4 of inductance L 1, the positive pole of capacitor C 4 connects the negative pole of capacitor C 3, and the positive pole of capacitor C 2 connects the negative pole of capacitor C 1; In said switch control and the drive circuit; Resistance R 3 is parallelly connected with capacitor C 5; The end of the end of the same name 1 terminating resistor R3 of transformer TRF primary coil Lp1; The negative pole of another terminating diode D5 of resistance R 3; Different name end 2 ends of transformer TRF primary coil Lp1 connect the positive pole of diode D5 and the internal switch pipe drain D end of control chip U1 respectively, and the bypass end BP of a termination control chip U1 of capacitor C 6 end, the other end of capacitor C 6 connect the negative pole of capacitor C 4 in internal switch pipe source S end and the input rectifying filter circuit of control chip U1 respectively; In the said output high pressure feedback circuit; The positive pole of the different name end 5 terminating diode D8 of transformer TRF secondary coil Ls1; Resistance R 5 is parallelly connected with capacitor C 9; The negative pole difference connecting resistance R6 of diode D8 and an end of resistance R 7, the positive pole of capacitor C 9; End of the same name 6 ends of transformer TRF secondary coil Ls1 link to each other with the negative pole of capacitor C 9 and meet high pressure output ground HGND; Anodal 1 pin of the interior light emitting diodes of another termination photoelectrical coupler U2 of resistance R 6; The other end of resistance R 7 connects interior light emitting diodes negative pole 2 pin of photoelectrical coupler U2, negative electrode 3 pin of adjustable reference source U3, an end of capacitor C 10 respectively; The control utmost point 1 pin of adjustable reference source U3 is connecting resistance R10 and an end of resistance R 11, the other end of capacitor C 10 respectively, anode 2 pin of adjustable reference source U3 link to each other with the other end of an end of capacitor C 12 and resistance R 11 and connect high pressure export HGND, the other end of resistance R 10 passes through resistance R 9 and resistance R 8 and links to each other with high-voltage output end HVOUT in the output rectifier and filter; Inside output triode emitter 3 pin of photoelectrical coupler U2 connect the internal switch pipe source S end of control chip U1 in the control of the other end, switch and the drive circuit of capacitor C 12 respectively, and what inside output triode collector electrode 4 pin of photoelectrical coupler U2 met control chip U1 in switch control and the drive circuit enables control end EN end.
The beneficial effect of the utility model is: the input power supply voltage range wide, but and AC and DC dual-purpose; Peripheral circuit is simple, uses components and parts few, is easy to make; Under the situation that guarantees high voltage source the key technical indexes parameter, realize the miniaturization of Alternating Current Power Supply low-power high-voltage power supply, be convenient to PCB design and modularization production.
Description of drawings
Fig. 1 is that the circuit of the utility model connects block diagram.
Fig. 2 is the circuit theory diagrams of the utility model.
Embodiment
Like Fig. 1, shown in 2; Exchange the input small-power and isolate fixing output high-voltage power circuit; Comprise output rectifier and filter; Also comprise input rectifying filter circuit, switch control and drive circuit, output high pressure feedback circuit, switch control and drive circuit are connected with input rectifying filter circuit, output high pressure feedback circuit, output rectifier and filter respectively, and output rectifier and filter is connected with output high pressure feedback circuit; In the input rectifying filter circuit; Supply and AC input L connects the positive pole of diode D1 and the negative pole of diode D3 respectively; Supply and AC input N connects the positive pole of diode D2 and the negative pole of diode D4 respectively through resistance R 1, connects the positive pole of capacitor C 1 and capacitor C 3 after the negative pole of diode D1 and diode D2 links to each other respectively, and resistance R 2 is parallelly connected with inductance L 1; After linking to each other, the positive pole of diode D3 and diode D4 connects the negative pole of capacitor C 2 and an end of inductance L 1 respectively; The negative pole of another termination capacitor C 4 of inductance L 1, the positive pole of capacitor C 4 connects the negative pole of capacitor C 3, and the positive pole of capacitor C 2 connects the negative pole of capacitor C 1; In switch control and the drive circuit; Resistance R 3 is parallelly connected with capacitor C 5; The end of the end of the same name 1 terminating resistor R3 of transformer TRF primary coil Lp1; The negative pole of another terminating diode D5 of resistance R 3; Different name end 2 ends of transformer TRF primary coil Lp1 connect the positive pole of diode D5 and the internal switch pipe drain D end of control chip U1 respectively, and the bypass end BP of a termination control chip U1 of capacitor C 6 end, the other end of capacitor C 6 connect the negative pole of capacitor C 4 in internal switch pipe source S end and the input rectifying filter circuit of control chip U1 respectively; In the output high pressure feedback circuit; The positive pole of the different name end 5 terminating diode D8 of transformer TRF secondary coil Ls1; Resistance R 5 is parallelly connected with capacitor C 9; The negative pole difference connecting resistance R6 of diode D8 and an end of resistance R 7, the positive pole of capacitor C 9; End of the same name 6 ends of transformer TRF secondary coil Ls1 link to each other with the negative pole of capacitor C 9 and meet high pressure output ground HGND; Anodal 1 pin of the interior light emitting diodes of another termination photoelectrical coupler U2 of resistance R 6; The other end of resistance R 7 connects interior light emitting diodes negative pole 2 pin of photoelectrical coupler U2, negative electrode 3 pin of adjustable reference source U3, an end of capacitor C 10 respectively; The control utmost point 1 pin of adjustable reference source U3 is connecting resistance R10 and an end of resistance R 11, the other end of capacitor C 10 respectively, anode 2 pin of adjustable reference source U3 link to each other with the other end of an end of capacitor C 12 and resistance R 11 and connect high pressure export HGND, the other end of resistance R 10 passes through resistance R 9 and resistance R 8 and links to each other with high-voltage output end HVOUT in the output rectifier and filter; Inside output triode emitter 3 pin of photoelectrical coupler U2 connect the internal switch pipe source S end of control chip U1 in the control of the other end, switch and the drive circuit of capacitor C 12 respectively, and what inside output triode collector electrode 4 pin of photoelectrical coupler U2 met control chip U1 in switch control and the drive circuit enables control end EN end.
This high voltage source master control chip adopts four end single-chip switching controller TNY255G, and it has characteristics such as switch operating frequency height, small-power output, high efficiency, control mode be simple, has under-voltage, overcurrent, defencive function such as overheated simultaneously.The power supply input is isolated with high-voltage output circuit fully, guarantees the fail safe and the reliability of power supply long-term work.In this high voltage source production,, should select the components and parts of low noise, low temperature drift, good stability for use for guaranteeing the key technical indexes; According to the size of output high pressure, appropriate design PCB handles transformer line pack arrangement technology, technique for coiling and High-Voltage Insulation well, guarantees that the isolation between input and output is withstand voltage.
Operation principle: TNY255G control chip U1 is a kind of small-power, high efficiency four end single-chip switching controllers, and its inside is integrated with control circuit and metal-oxide-semiconductor field effect transistor.It adopts by all peak current limit patterns, limits maximum ON time, and this electric current is a fixed value (about 280mA), and the variation with other signal does not change, and is fit to make the high voltage source below the 10W.The BP pin of TNY255G control chip U1 is the bypass end, external filter capacitor C6, and during operate as normal, portion's metal-oxide-semiconductor conduction period is that control circuit provides energy within it; The D pin of control chip U1 is the drain electrode of inner metal-oxide-semiconductor, and is that startup and steady operation provide operating current; The S pin of control chip U1 is the source electrode of inner metal-oxide-semiconductor; The EN pin of control chip U1 is for enabling control end, under the operate as normal, and when this pin is high level, inner metal-oxide-semiconductor conducting, on the contrary inner metal-oxide-semiconductor turn-offs.After alternating supply voltage process diode D1～D4 bridge rectifier and the capacitor C 1～C4 filtering, produce the direct voltage about 300V.Resistance R 1 is a fusing resistor; Constitute the High-frequency Interference filter by inductance L 1, damping resistance R2 and filter capacitor C1～C4; Form the inner metal-oxide-semiconductor drain electrode of control chip U1 clamping protective circuit by resistance R 3, capacitor C 5 and diode D5.Secondary coil Ls1, diode D8 and capacitor C 9 etc. by transformer TRF are formed accessory power supply, for the control circuit of high pressure outlet side provides electric energy.The sampled signal that output high pressure HVOUT obtains through resistance R 8 ~ R11, through adjustable reference source U3 and photoelectrical coupler U2, what be sent to control chip U1 enables control end EN, regulates duty ratio, thereby carries out voltage control to exporting high pressure.
Claims (1)
1. one kind exchanges the fixing output of input small-power isolation high-voltage power circuit; Comprise output rectifier and filter; It is characterized in that: also comprise input rectifying filter circuit, switch control and drive circuit, output high pressure feedback circuit; Said switch control and drive circuit are connected with input rectifying filter circuit, output high pressure feedback circuit, output rectifier and filter respectively, and said output rectifier and filter is connected with output high pressure feedback circuit;
In the said input rectifying filter circuit; Supply and AC input L connects the positive pole of diode D1 and the negative pole of diode D3 respectively; Supply and AC input N connects the positive pole of diode D2 and the negative pole of diode D4 respectively through resistance R 1, connects the positive pole of capacitor C 1 and capacitor C 3 after the negative pole of diode D1 and diode D2 links to each other respectively, and resistance R 2 is parallelly connected with inductance L 1; After linking to each other, the positive pole of diode D3 and diode D4 connects the negative pole of capacitor C 2 and an end of inductance L 1 respectively; The negative pole of another termination capacitor C 4 of inductance L 1, the positive pole of capacitor C 4 connects the negative pole of capacitor C 3, and the positive pole of capacitor C 2 connects the negative pole of capacitor C 1;
In said switch control and the drive circuit; Resistance R 3 is parallelly connected with capacitor C 5; The end of the end of the same name 1 terminating resistor R3 of transformer TRF primary coil Lp1; The negative pole of another terminating diode D5 of resistance R 3; Different name end 2 ends of transformer TRF primary coil Lp1 connect the positive pole of diode D5 and the internal switch pipe drain D end of control chip U1 respectively, and the bypass end BP of a termination control chip U1 of capacitor C 6 end, the other end of capacitor C 6 connect the negative pole of capacitor C 4 in internal switch pipe source S end and the input rectifying filter circuit of control chip U1 respectively;
In the said output high pressure feedback circuit; The positive pole of the different name end 5 terminating diode D8 of transformer TRF secondary coil Ls1; Resistance R 5 is parallelly connected with capacitor C 9; The negative pole difference connecting resistance R6 of diode D8 and an end of resistance R 7, the positive pole of capacitor C 9; End of the same name 6 ends of transformer TRF secondary coil Ls1 link to each other with the negative pole of capacitor C 9 and meet high pressure output ground HGND; Anodal 1 pin of the interior light emitting diodes of another termination photoelectrical coupler U2 of resistance R 6; The other end of resistance R 7 connects interior light emitting diodes negative pole 2 pin of photoelectrical coupler U2, negative electrode 3 pin of adjustable reference source U3, an end of capacitor C 10 respectively; The control utmost point 1 pin of adjustable reference source U3 is connecting resistance R10 and an end of resistance R 11, the other end of capacitor C 10 respectively, anode 2 pin of adjustable reference source U3 link to each other with the other end of an end of capacitor C 12 and resistance R 11 and connect high pressure export HGND, the other end of resistance R 10 passes through resistance R 9 and resistance R 8 and links to each other with high-voltage output end HVOUT in the output rectifier and filter; Inside output triode emitter 3 pin of photoelectrical coupler U2 connect the internal switch pipe source S end of control chip U1 in the control of the other end, switch and the drive circuit of capacitor C 12 respectively, and what inside output triode collector electrode 4 pin of photoelectrical coupler U2 met control chip U1 in switch control and the drive circuit enables control end EN end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120270967U CN202150806U (en) | 2011-07-28 | 2011-07-28 | AC input miniwatt isolation fixed output high-voltage power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120270967U CN202150806U (en) | 2011-07-28 | 2011-07-28 | AC input miniwatt isolation fixed output high-voltage power supply circuit |
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| Publication Number | Publication Date |
|---|---|
| CN202150806U true CN202150806U (en) | 2012-02-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120270967U Withdrawn - After Issue CN202150806U (en) | 2011-07-28 | 2011-07-28 | AC input miniwatt isolation fixed output high-voltage power supply circuit |
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| CN (1) | CN202150806U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102270933A (en) * | 2011-07-28 | 2011-12-07 | 天津市东文高压电源厂 | High voltage power circuit with AC input and low-power isolated fixed output |
| CN104242616A (en) * | 2014-10-15 | 2014-12-24 | 国家电网公司 | Power supply circuit of multi-functional electric energy meter |
-
2011
- 2011-07-28 CN CN201120270967U patent/CN202150806U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102270933A (en) * | 2011-07-28 | 2011-12-07 | 天津市东文高压电源厂 | High voltage power circuit with AC input and low-power isolated fixed output |
| CN102270933B (en) * | 2011-07-28 | 2013-04-17 | 东文高压电源（天津）有限公司 | High voltage power circuit with AC input and low-power isolated fixed output |
| CN104242616A (en) * | 2014-10-15 | 2014-12-24 | 国家电网公司 | Power supply circuit of multi-functional electric energy meter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120222 Effective date of abandoning: 20130417 |
|
| RGAV | Abandon patent right to avoid regrant |