CN102891609A - Negative polarity fixed output high-voltage power circuit consisting of TL431 - Google Patents
Negative polarity fixed output high-voltage power circuit consisting of TL431 Download PDFInfo
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- CN102891609A CN102891609A CN2012104298345A CN201210429834A CN102891609A CN 102891609 A CN102891609 A CN 102891609A CN 2012104298345 A CN2012104298345 A CN 2012104298345A CN 201210429834 A CN201210429834 A CN 201210429834A CN 102891609 A CN102891609 A CN 102891609A
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Abstract
The invention relates to a negative polarity fixed output high-voltage power circuit consisting of TL431, which is used for multiple related measuring instruments in the fields of industry, environment protection, medical treatment, military project and the like and serves as a high-voltage source. The negative polarity fixed output high-voltage power circuit comprises a high-voltage output circuit and also comprises a high-voltage control and driving circuit, an overcurrent protection circuit, wherein the high-voltage control and driving circuit is respectively connected with the overcurrent protection circuit and the high-voltage output circuit; and the high-voltage output circuit is connected with the overcurrent protection circuit. The negative polarity fixed output high-voltage power circuit has the beneficial effects that a special control chip is not required, the circuit is novel in concept and simple in principle, fewer components are used, and the high-voltage power circuit is extremely small in overall dimension, light in weight, high in reliability and stability and easy to mount.
Description
Technical field
The present invention relates to a kind of multiple measurement of correlation instrument for fields such as industry, environmental protection, medical treatment and military projects as the fixing output of the negative polarity high-voltage power circuit that is consisted of by TL431 of high-voltage power supply.
Background technology
Miniature, the low-power high-voltage power supply is of many uses, it is applied to multiple analysis to measure instrument, instrumentation in the various fields.Along with the miniaturization of various instrument and meter equipment and the expansion of function and usage, original small-power negative high voltage power source is withdrawn from the market more gradually because of its volume weight, market is more and more to demand miniature, small-power negative polarity output high voltage source, require overall dimension more and more less, weight is more and more lighter, guarantee to meet customer need and the prerequisite of electrical performance indexes under, miniaturization, microminiaturization, variation become development trend miniature, the low-power high-voltage power supply.
Summary of the invention
In view of existing market actual conditions and Future Development trend, the invention provides a kind of circuit simple, use that components and parts are few, good reliability and stability, miniature volume, the fixing output of the negative polarity high-voltage power circuit that uses TL431 to consist of.
The present invention for achieving the above object, the technical scheme of taking is: the fixing output of the negative polarity that a kind of TL431 consists of high-voltage power circuit, comprise high-voltage output circuit, it is characterized in that: also comprise high voltage control and drive circuit, current foldback circuit, described high voltage control and drive circuit are connected with high-voltage output circuit with current foldback circuit respectively, and described high-voltage output circuit is connected with current foldback circuit;
In described high voltage control and the drive circuit, the positive pole of diode D8 connects for electrical input+Vin, one end of inductance L 1 connects respectively the negative pole of diode D8, the emitter of triode T1, one end of resistance R 6 and capacitor C 12, the other end of inductance L 1 connects respectively the positive pole of capacitor C 14, different name end 1 pin of transformer TRF primary coil Lp1, the negative pole of capacitor C 14 meets input ground GND, Same Name of Ends 2 pin of transformer TRF primary coil Lp1 connect the collector electrode of triode T2, different name end 3 pin of transformer TRF primary coil Lp2 connect the base stage of triode T2, Same Name of Ends 4 pin of transformer TRF primary coil Lp2 connect respectively an end of capacitor C 15 and resistance R 1 by resistance R 2, the other end of capacitor C 15 links to each other with the emitter of triode T2 and meets input ground GND, the collector electrode of another termination triode T1 of resistance R 1 and the other end of capacitor C 12, the base stage of triode T1 connects the emitter of triode T3 by resistance R 3, resistance R 5 and capacitor C 11 parallel connections, the end of the base stage connecting resistance R5 of triode T3, the negative electrode 3 pin difference connecting resistance R4 of controlled a reference source U2 and an end of capacitor C 10, the other end of resistance R 5, another termination power supply input+Vin of resistance R 4, the control utmost point 1 pin difference connecting resistance R9 of controlled a reference source U2 and an end of resistance R 11, the negative pole of diode D9, the other end of capacitor C 10, anode 2 pin of controlled a reference source U2 link to each other with the positive pole of diode D9 and meet input ground GND, resistance R 12 and capacitor C 9 parallel connections, the end of the other end connecting resistance R12 of resistance R 11, an end A point of capacitor C 7 in another termination high-voltage output circuit of resistance R 12, the end of the other end connecting resistance R10 of resistance R 9, the negative electrode 3 pin difference connecting resistance R7 of controlled a reference source U1 and an end of capacitor C 13, the other end of resistance R 6 and resistance R 10, the control utmost point 1 pin of controlled a reference source U1 is the end of connecting resistance R8 respectively, the other end of resistance R 7, anode 2 pin of controlled a reference source U1 link to each other with the other end of resistance R 8 and capacitor C 13 and meet input ground GND;
In the described current foldback circuit; the collector electrode of triode T4 connects negative electrode 3 pin of controlled a reference source U1 in high voltage control and the drive circuit; the base stage difference connecting resistance R13 of triode T4 and an end of capacitor C 8; the emitter of triode T4 links to each other with the other end of capacitor C 8 and meets input ground GND; the negative pole of diode D1 in the end of the other end difference connecting resistance R14 of resistance R 13, the positive pole of diode D7, the high-voltage output circuit, the negative pole of another terminating diode D7 of resistance R 14 also connects High voltage output ground HG end.
The invention has the beneficial effects as follows: need not special integrated circuit, circuit is novel, and principle is simple, uses components and parts less, very little overall dimension, very light weight, good reliability and stability, is easy to install.
Description of drawings
Fig. 1 is that circuit of the present invention connects block diagram;
Fig. 2 is circuit theory diagrams of the present invention.
Embodiment
As shown in Figure 1, 2; the fixing output of the negative polarity that TL431 consists of high-voltage power circuit; comprise high-voltage output circuit; also comprise high voltage control and drive circuit, current foldback circuit; high voltage control and drive circuit are connected with high-voltage output circuit with current foldback circuit respectively, and high-voltage output circuit is connected with current foldback circuit.
In above-mentioned high voltage control and the drive circuit, the positive pole of diode D8 connects for electrical input+Vin, one end of inductance L 1 connects respectively the negative pole of diode D8, the emitter of triode T1, one end of resistance R 6 and capacitor C 12, the other end of inductance L 1 connects respectively the positive pole of capacitor C 14, different name end 1 pin of transformer TRF primary coil Lp1, the negative pole of capacitor C 14 meets input ground GND, Same Name of Ends 2 pin of transformer TRF primary coil Lp1 connect the collector electrode of triode T2, different name end 3 pin of transformer TRF primary coil Lp2 connect the base stage of triode T2, Same Name of Ends 4 pin of transformer TRF primary coil Lp2 connect respectively an end of capacitor C 15 and resistance R 1 by resistance R 2, the other end of capacitor C 15 links to each other with the emitter of triode T2 and meets input ground GND, the collector electrode of another termination triode T1 of resistance R 1 and the other end of capacitor C 12, the base stage of triode T1 connects the emitter of triode T3 by resistance R 3, resistance R 5 and capacitor C 11 parallel connections, the end of the base stage connecting resistance R5 of triode T3, the negative electrode 3 pin difference connecting resistance R4 of controlled a reference source U2 and an end of capacitor C 10, the other end of resistance R 5, another termination power supply input+Vin of resistance R 4, the control utmost point 1 pin difference connecting resistance R9 of controlled a reference source U2 and an end of resistance R 11, the negative pole of diode D9, the other end of capacitor C 10, anode 2 pin of controlled a reference source U2 link to each other with the positive pole of diode D9 and meet input ground GND, resistance R 12 and capacitor C 9 parallel connections, the end of the other end connecting resistance R12 of resistance R 11, an end A point of capacitor C 7 in another termination high-voltage output circuit of resistance R 12, the end of the other end connecting resistance R10 of resistance R 9, the negative electrode 3 pin difference connecting resistance R7 of controlled a reference source U1 and an end of capacitor C 13, the other end of resistance R 6 and resistance R 10, the control utmost point 1 pin of controlled a reference source U1 is the end of connecting resistance R8 respectively, the other end of resistance R 7, anode 2 pin of controlled a reference source U1 link to each other with the other end of resistance R 8 and capacitor C 13 and meet input ground GND.
In the above-mentioned current foldback circuit; the collector electrode of triode T4 connects negative electrode 3 pin of controlled a reference source U1 in high voltage control and the drive circuit; the base stage difference connecting resistance R13 of triode T4 and an end of capacitor C 8; the emitter of triode T4 links to each other with the other end of capacitor C 8 and meets input ground GND; the negative pole of diode D1 in the end of the other end difference connecting resistance R14 of resistance R 13, the positive pole of diode D7, the high-voltage output circuit, the negative pole of another terminating diode D7 of resistance R 14 also connects High voltage output ground HG end.
The model of controlled a reference source U1, controlled a reference source U2 is: TL431.
The control drive circuit adopts the self-oscillation mode, and consists of high pressure FEEDBACK CONTROL link with two controlled a reference source U1 of Themaincontroller and controlled a reference source U2 etc., and the output overcurrent protection is arranged, and circuit is novel, simple in structure.
Select the SMD components of low noise, Low Drift Temperature, good stability; Adopt the multi-layer PCB layout, at utmost reduce overall dimension, weight reduction; Guarantee transformer wire pack arrangement technique, technique for coiling and High-Voltage Insulation processing, make it reliable and stable.
Operation principle
Form self-maintained circuit by the elementary main coil Lp1 of transformer TRF, feedback coil Lp2, triode T2 and capacitor C 15 etc.Behind the plugged, by oscillator work, elementary generation high-frequency pulse voltage, and be coupled to its secondary coil Ls1 by transformer TRF, the ac pulse voltage at its two ends produces high pressure after cockcroft-walton voltage multiplier and filtering.The output high pressure obtains the high pressure sampled signal by resistance R 11, resistance R 12 and resistance R 9, resistance R 10, and deliver to control end 1 pin of controlled a reference source U2 through level shift, consist of voltage feedback circuit via controlled a reference source U2, triode T3, triode T1 etc., the operating state of control generator, and then the output of control, stable high voltage.
In the normal output situation, at the sampled voltage that is proportional to output current that resistance R 14 obtains, deficiency is so that triode T4 conducting, and this moment, triode T4 was in cut-off state; When output current during greater than the output protection electric current; the output current sampled voltage that obtains in resistance R 14; make triode T4 conducting; so that the control utmost point 1 pin current potential of controlled a reference source U2 reduces; and then the negative electrode 3 pin current potentials that make controlled a reference source U2 approach power supply input voltage+Vin; triode T3, triode T1 cut-off, thus close oscillating circuit, play a protective role.
It is anti-that the acting as of diode D8 prevents inputting termination; 1 pair of high frequency of oscillation alternating voltage of inductance L plays the isolation barrier effect, reduces high-frequency ac working pulse voltage to the interference of control circuit and supply power voltage; The amplitude that act as restriction output current sampled voltage of diode D7; The effect of diode D9 is to prevent that the control utmost point of controlled a reference source U2 1 pin current potential is for negative.
Claims (1)
1. the negative polarity of a TL431 formation is fixed the output high-voltage power circuit, comprise high-voltage output circuit, it is characterized in that: also comprise high voltage control and drive circuit, current foldback circuit, described high voltage control and drive circuit are connected with high-voltage output circuit with current foldback circuit respectively, and described high-voltage output circuit is connected with current foldback circuit;
In described high voltage control and the drive circuit, the positive pole of diode D8 connects for electrical input+Vin, one end of inductance L 1 connects respectively the negative pole of diode D8, the emitter of triode T1, one end of resistance R 6 and capacitor C 12, the other end of inductance L 1 connects respectively the positive pole of capacitor C 14, different name end 1 pin of transformer TRF primary coil Lp1, the negative pole of capacitor C 14 meets input ground GND, Same Name of Ends 2 pin of transformer TRF primary coil Lp1 connect the collector electrode of triode T2, different name end 3 pin of transformer TRF primary coil Lp2 connect the base stage of triode T2, Same Name of Ends 4 pin of transformer TRF primary coil Lp2 connect respectively an end of capacitor C 15 and resistance R 1 by resistance R 2, the other end of capacitor C 15 links to each other with the emitter of triode T2 and meets input ground GND, the collector electrode of another termination triode T1 of resistance R 1 and the other end of capacitor C 12, the base stage of triode T1 connects the emitter of triode T3 by resistance R 3, resistance R 5 and capacitor C 11 parallel connections, the end of the base stage connecting resistance R5 of triode T3, the negative electrode 3 pin difference connecting resistance R4 of controlled a reference source U2 and an end of capacitor C 10, the other end of resistance R 5, another termination power supply input+Vin of resistance R 4, the control utmost point 1 pin difference connecting resistance R9 of controlled a reference source U2 and an end of resistance R 11, the negative pole of diode D9, the other end of capacitor C 10, anode 2 pin of controlled a reference source U2 link to each other with the positive pole of diode D9 and meet input ground GND, resistance R 12 and capacitor C 9 parallel connections, the end of the other end connecting resistance R12 of resistance R 11, an end A point of capacitor C 7 in another termination high-voltage output circuit of resistance R 12, the end of the other end connecting resistance R10 of resistance R 9, the negative electrode 3 pin difference connecting resistance R7 of controlled a reference source U1 and an end of capacitor C 13, the other end of resistance R 6 and resistance R 10, the control utmost point 1 pin of controlled a reference source U1 is the end of connecting resistance R8 respectively, the other end of resistance R 7, anode 2 pin of controlled a reference source U1 link to each other with the other end of resistance R 8 and capacitor C 13 and meet input ground GND;
In the described current foldback circuit; the collector electrode of triode T4 connects negative electrode 3 pin of controlled a reference source U1 in high voltage control and the drive circuit; the base stage difference connecting resistance R13 of triode T4 and an end of capacitor C 8; the emitter of triode T4 links to each other with the other end of capacitor C 8 and meets input ground GND; the negative pole of diode D1 in the end of the other end difference connecting resistance R14 of resistance R 13, the positive pole of diode D7, the high-voltage output circuit, the negative pole of another terminating diode D7 of resistance R 14 also connects High voltage output ground HG end.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012104298345A CN102891609A (en) | 2012-11-01 | 2012-11-01 | Negative polarity fixed output high-voltage power circuit consisting of TL431 |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012104298345A CN102891609A (en) | 2012-11-01 | 2012-11-01 | Negative polarity fixed output high-voltage power circuit consisting of TL431 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103414163A (en) * | 2013-08-26 | 2013-11-27 | 中国兵器工业集团第二一四研究所苏州研发中心 | Direct-current power supply output overcurrent protection device |
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| CN201039014Y (en) * | 2007-05-23 | 2008-03-19 | 陆启玉 | High-voltage static generator |
| CN101512885A (en) * | 2006-06-26 | 2009-08-19 | 巴特尔纪念研究院 | High voltage power supply |
| CN101807858A (en) * | 2010-05-06 | 2010-08-18 | 天津市东文高压电源厂 | Small two-way positive and negative output high-voltage module power |
| CN102332828A (en) * | 2011-09-19 | 2012-01-25 | 东文高压电源（天津）有限公司 | Simple micro fixed positive output high voltage power circuit |
| CN202889207U (en) * | 2012-11-01 | 2013-04-17 | 东文高压电源（天津）有限公司 | Negative polar fixed-output high-voltage power supply circuit composed of TL431 |
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2012
- 2012-11-01 CN CN2012104298345A patent/CN102891609A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101512885A (en) * | 2006-06-26 | 2009-08-19 | 巴特尔纪念研究院 | High voltage power supply |
| CN201039014Y (en) * | 2007-05-23 | 2008-03-19 | 陆启玉 | High-voltage static generator |
| CN101807858A (en) * | 2010-05-06 | 2010-08-18 | 天津市东文高压电源厂 | Small two-way positive and negative output high-voltage module power |
| CN102332828A (en) * | 2011-09-19 | 2012-01-25 | 东文高压电源（天津）有限公司 | Simple micro fixed positive output high voltage power circuit |
| CN202889207U (en) * | 2012-11-01 | 2013-04-17 | 东文高压电源（天津）有限公司 | Negative polar fixed-output high-voltage power supply circuit composed of TL431 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103414163A (en) * | 2013-08-26 | 2013-11-27 | 中国兵器工业集团第二一四研究所苏州研发中心 | Direct-current power supply output overcurrent protection device |
| CN103414163B (en) * | 2013-08-26 | 2016-12-28 | 中国兵器工业集团第二一四研究所苏州研发中心 | DC source output overcurrent protection device |
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Application publication date: 20130123 |