CN203691243U - Negative polarity adjustable high voltage supply circuit composed of TL5001A - Google Patents
Negative polarity adjustable high voltage supply circuit composed of TL5001A Download PDFInfo
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- CN203691243U CN203691243U CN201320841363.9U CN201320841363U CN203691243U CN 203691243 U CN203691243 U CN 203691243U CN 201320841363 U CN201320841363 U CN 201320841363U CN 203691243 U CN203691243 U CN 203691243U
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Abstract
The utility model relates to a negative polarity adjustable high voltage supply circuit composed of TL5001A. The negative polarity adjustable high voltage supply circuit includes a high-voltage output rectification filter circuit, a current foldback circuit, a driving control circuit, and an output enablement control circuit, and further includes an output voltage feedback and monitoring circuit, the high-voltage output rectification filter circuit is connected with the driving control circuit via the output voltage feedback and monitoring circuit and the current foldback circuit, the driving control circuit is connected with the high-voltage output rectification filter circuit, and the output enablement control circuit is connected with the output voltage feedback and monitoring circuit. The negative polarity adjustable high voltage supply circuit is advantageous in that the circuit is simple and novel in structure and is easy to miniaturize; the circuit is completely controlled by PWM power and a master control chip TL5001A integrates a PWM control circuit required by all functions of a single chip; the circuit has the functions of reference output, enablement control, output adjustment, output monitoring, and over-current short circuit protection, and the range of output voltage is wide and the long-term work performance is stable and reliable.
Description
Technical field
The utility model relates to a kind of a kind of negative polarity adjustable high voltage power supply circuit being made up of TL5001A being applied in the aspect instrument and equipments such as spectrum analysis, environmental monitoring, biotechnology and medical treatment.
Background technology
Low-power high-voltage power supply product on market is of a great variety, of many uses, but that many power supply products exist on circuit form is stereotyped, without there being new meaning, function is few, product structure is also similar.Along with the development of electronics technology, market proposes higher requirement to the technical performance of high voltage source, user is in the continuous novel small-power positive high voltage of demand power supply, and the application of small-power negative high voltage power source is also expanding, and it has the indices requirement identical with positive high voltage power supply.
Summary of the invention
In view of the conditions of demand of actual market, the utility model provides a kind of pulse width modulation controlled, multi-functional, stable and reliable for performance, a kind of negative polarity adjustable high voltage power supply circuit being made up of TL5001A easy to use.
The utility model for achieving the above object, the technical scheme of taking is: a kind of negative polarity adjustable high voltage power supply circuit being made up of TL5001A, comprise High voltage output current rectifying and wave filtering circuit, current foldback circuit, Drive and Control Circuit, output enable control circuit, it is characterized in that: also comprise output voltage feedback and observation circuit, described High voltage output current rectifying and wave filtering circuit feeds back and observation circuit by output voltage respectively, current foldback circuit is connected with Drive and Control Circuit, described Drive and Control Circuit is connected with High voltage output current rectifying and wave filtering circuit, described output enable control circuit is connected with output voltage feedback and observation circuit,
In described output voltage feedback and observation circuit, inverting input 2 pin of control chip U3A are connected with output 1 pin of control chip U3A and as negative output voltage monitoring side-Vd by resistance R 26, in parallel with capacitor C 24 after voltage stabilizing didoe D6 and D7 differential concatenation, in-phase input end 3 pin of control chip U3A connect respectively the positive pole of voltage stabilizing didoe D6, one end of resistance R 27, 4 pin of control chip U3A connect negative power supply, 8 pin of control chip U3A meet input positive supply voltage+Vin, the positive pole of voltage stabilizing didoe D7 meets input ground GND, the other end difference connecting resistance R7 of resistance R 27 and one end of R8, the other end of resistance R 7 meets the negative high voltage output-HV in High voltage output current rectifying and wave filtering circuit by resistance R 11 and R6, capacitor C 18 is in parallel with resistance R 14, the in-phase input end 5 pin difference connecting resistance R14 of control chip U2B and one end of R10, one end of capacitor C 17, the other end of resistance R 8, the positive pole of diode D2 in another termination High voltage output current rectifying and wave filtering circuit of capacitor C 17, another termination input ground GND of resistance R 14, resistance R 9 is in parallel with capacitor C 23, the inverting input 6 pin difference connecting resistance R9 of control chip U2B and one end of resistance R 13, another termination input ground GND of resistance R 9, one end of another termination capacitor C 19 of resistance R 13, output 7 pin one end of connecting resistance R12 respectively of control chip U2B, the other end of capacitor C 19, 4 pin of control chip U1 in another termination Drive and Control Circuit of resistance R 12, output 1 pin one end of connecting resistance R28 respectively of control chip U2A, the other end of resistance R 10, the other end of the inverting input 2 pin connecting resistance R28 of control chip U2A, in-phase input end 3 pin of control chip U2A are by one end of resistance R 15 difference connecting resistance R16 and capacitor C 20, the collector electrode of triode Q3 in output enable control circuit, another termination output of resistance R 16 regulates control end Vadj, another termination input ground GND of capacitor C 20, 4 pin of control chip U2A meet input ground GND, 8 pin of control chip U2A meet input positive supply voltage+Vin.
The beneficial effects of the utility model are: this negative high voltage power source circuit structure is simple, novel, is easy to miniaturization; Pwm power control completely, main control chip TL5001A has included the required pwm control circuit of all functions of monolithic chip in; Circuit has benchmark output, enables to control, export the functions such as adjusting, output monitoring, overcurrent short-circuit protection; Wide input voltage range, long-term work is stable and reliable for performance.
Brief description of the drawings
Fig. 1 is that circuit of the present utility model connects block diagram;
Fig. 2 is circuit theory diagrams of the present utility model.
Embodiment
As Fig. 1, shown in 2, a kind of negative polarity adjustable high voltage power supply circuit being formed by TL5001A, comprise High voltage output current rectifying and wave filtering circuit, current foldback circuit, Drive and Control Circuit, output enable control circuit, it is characterized in that: also comprise output voltage feedback and observation circuit, described High voltage output current rectifying and wave filtering circuit feeds back and observation circuit by output voltage respectively, current foldback circuit is connected with Drive and Control Circuit, described Drive and Control Circuit is connected with High voltage output current rectifying and wave filtering circuit, described output enable control circuit is connected with output voltage feedback and observation circuit,
In above-mentioned output voltage feedback and observation circuit, inverting input 2 pin of control chip U3A are connected with output 1 pin of control chip U3A and as negative output voltage monitoring side-Vd by resistance R 26, in parallel with capacitor C 24 after voltage stabilizing didoe D6 and D7 differential concatenation, in-phase input end 3 pin of control chip U3A connect respectively the positive pole of voltage stabilizing didoe D6, one end of resistance R 27, 4 pin of control chip U3A connect negative power supply, 8 pin of control chip U3A meet input positive supply voltage+Vin, the positive pole of voltage stabilizing didoe D7 meets input ground GND, the other end difference connecting resistance R7 of resistance R 27 and one end of R8, the other end of resistance R 7 meets the negative high voltage output-HV in High voltage output current rectifying and wave filtering circuit by resistance R 11 and R6, capacitor C 18 is in parallel with resistance R 14, the in-phase input end 5 pin difference connecting resistance R14 of control chip U2B and one end of R10, one end of capacitor C 17, the other end of resistance R 8, the positive pole of diode D2 in another termination High voltage output current rectifying and wave filtering circuit of capacitor C 17, another termination input ground GND of resistance R 14, resistance R 9 is in parallel with capacitor C 23, the inverting input 6 pin difference connecting resistance R9 of control chip U2B and one end of resistance R 13, another termination input ground GND of resistance R 9, one end of another termination capacitor C 19 of resistance R 13, output 7 pin one end of connecting resistance R12 respectively of control chip U2B, the other end of capacitor C 19, 4 pin of control chip U1 in another termination Drive and Control Circuit of resistance R 12, output 1 pin one end of connecting resistance R28 respectively of control chip U2A, the other end of resistance R 10, the other end of the inverting input 2 pin connecting resistance R28 of control chip U2A, in-phase input end 3 pin of control chip U2A are by one end of resistance R 15 difference connecting resistance R16 and capacitor C 20, the collector electrode of triode Q3 in output enable control circuit, another termination output of resistance R 16 regulates control end Vadj, another termination input ground GND of capacitor C 20, 4 pin of control chip U2A meet input ground GND, 8 pin of control chip U2A meet input positive supply voltage+Vin,
The model of pwm control circuit chip U1 is: TL5001A; The model of amplifier U2, U3 is: LM358.
Main control chip U1 is pulse width modulation power control circuit completely; though this chip pin is few; but function is complete; its inside has the circuit such as under-voltage locking, short-circuit protection; the wide input voltage range of 3.6V～40V, externally has the control ends such as Dead Time, operating frequency, short-circuit protection, frequency compensation, output feedback.The drive part of this power circuit adopts single-ended flyback, and is added with peak absorbance circuit, and integrated circuit is simple in structure, novel and be easy to miniaturization, externally has multiple function exits, is user-friendly to.
Operation principle
The kernel control chip U1 of power circuit adopts pulse-width modulation completely (PWM) integral control circuit chip.The feature of this chip is: the wide input voltage range of 3.6V～40V; The operating frequency range of 20KHz～500 KHz; Inside comprises an error amplifier, pressurizer, crystal oscillator, PWM comparator with Dead Time control input end, have under-voltage locking and short-circuit protection, open-collector output transistor; The Dead Time control of super scope; The reference voltage of ± 3% error etc.
The pwm control signal of the 1 pin output of control chip U1, drives high frequency transformer TRF primary coil Lp1 by P ditch MOS switch triode Q1, and high-frequency pulse current produces induced potential at its two ends, and is coupled to secondary by transformer TRF.The high-frequency pulse voltage that secondary coil Ls two ends obtain, by exporting negative high voltage after the High voltage output current rectifying and wave filtering circuit being made up of diode D1 ~ D4 and capacitor C 11 ~ C16 etc.
The voltage feedback signal that output negative high voltage obtains by output sample circuit, deliver to the in-phase input end of error amplifier U2B, together with regulating control voltage Vadj with output, control the output of U2B, and then by feedback end 4 pin of U1, control the duty ratio of U1 output pulse, finally reach the object of regulated output voltage.The negative follower output that the sampled voltage obtaining in resistance R 8 consists of amplifier U3A, as the monitoring voltage Vd of output negative high voltage.
In the time that output current is very little, the undertension at resistance R 23 two ends is so that triode Q2 conducting, and 6 pin (Dead Time control end) the DTC end of U1 is relative high potential; Along with the increase of output current, the voltage at resistance R 23 two ends increases, thereby the collector potential of triode Q2 is declined, and the 6 pin DTC terminal potentials of U1 decline, and reach the object of restriction output current.
In the time that Enable Pin EN is unsettled, amplifier U3B is output as negative potential, and triode Q3 cut-off, is normally exported without impact output regulation voltage Vadj; In the time of Enable Pin EN ground connection, amplifier U3B is output as high potential, and triode Q3 conducting regulates control voltage Vadj thereby close output, now without High voltage output.
In addition, resistance R 3 determines the operating frequency of U1, and the effect of capacitor C 17 is the dynamic responses that improve this high-voltage power circuit, and voltage stabilizing didoe D6 and D7 are double limiting, protection control chip U3A.
Claims (1)
1. the negative polarity adjustable high voltage power supply circuit being formed by TL5001A, comprise High voltage output current rectifying and wave filtering circuit, current foldback circuit, Drive and Control Circuit, output enable control circuit, it is characterized in that: also comprise output voltage feedback and observation circuit, described High voltage output current rectifying and wave filtering circuit feeds back by output voltage respectively and observation circuit, current foldback circuit are connected with Drive and Control Circuit, described Drive and Control Circuit is connected with High voltage output current rectifying and wave filtering circuit, and described output enable control circuit is connected with output voltage feedback and observation circuit;
In described output voltage feedback and observation circuit, inverting input 2 pin of control chip U3A are connected with output 1 pin of control chip U3A and as negative output voltage monitoring side-Vd by resistance R 26, in parallel with capacitor C 24 after voltage stabilizing didoe D6 and D7 differential concatenation, in-phase input end 3 pin of control chip U3A connect respectively the positive pole of voltage stabilizing didoe D6, one end of resistance R 27, 4 pin of control chip U3A connect negative power supply, 8 pin of control chip U3A meet input positive supply voltage+Vin, the positive pole of voltage stabilizing didoe D7 meets input ground GND, the other end difference connecting resistance R7 of resistance R 27 and one end of R8, the other end of resistance R 7 meets the negative high voltage output-HV in High voltage output current rectifying and wave filtering circuit by resistance R 11 and R6, capacitor C 18 is in parallel with resistance R 14, the in-phase input end 5 pin difference connecting resistance R14 of control chip U2B and one end of R10, one end of capacitor C 17, the other end of resistance R 8, the positive pole of diode D2 in another termination High voltage output current rectifying and wave filtering circuit of capacitor C 17, another termination input ground GND of resistance R 14, resistance R 9 is in parallel with capacitor C 23, the inverting input 6 pin difference connecting resistance R9 of control chip U2B and one end of resistance R 13, another termination input ground GND of resistance R 9, one end of another termination capacitor C 19 of resistance R 13, output 7 pin one end of connecting resistance R12 respectively of control chip U2B, the other end of capacitor C 19, 4 pin of control chip U1 in another termination Drive and Control Circuit of resistance R 12, output 1 pin one end of connecting resistance R28 respectively of control chip U2A, the other end of resistance R 10, the other end of the inverting input 2 pin connecting resistance R28 of control chip U2A, in-phase input end 3 pin of control chip U2A are by one end of resistance R 15 difference connecting resistance R16 and capacitor C 20, the collector electrode of triode Q3 in output enable control circuit, another termination output of resistance R 16 regulates control end Vadj, another termination input ground GND of capacitor C 20, 4 pin of control chip U2A meet input ground GND, 8 pin of control chip U2A meet input positive supply voltage+Vin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320841363.9U CN203691243U (en) | 2013-12-19 | 2013-12-19 | Negative polarity adjustable high voltage supply circuit composed of TL5001A |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320841363.9U CN203691243U (en) | 2013-12-19 | 2013-12-19 | Negative polarity adjustable high voltage supply circuit composed of TL5001A |
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| CN203691243U true CN203691243U (en) | 2014-07-02 |
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| CN201320841363.9U Expired - Lifetime CN203691243U (en) | 2013-12-19 | 2013-12-19 | Negative polarity adjustable high voltage supply circuit composed of TL5001A |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109274261A (en) * | 2018-11-30 | 2019-01-25 | 中国电子科技集团公司第四十三研究所 | A kind of non-isolated negative pressure output control circuit and control method |
-
2013
- 2013-12-19 CN CN201320841363.9U patent/CN203691243U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109274261A (en) * | 2018-11-30 | 2019-01-25 | 中国电子科技集团公司第四十三研究所 | A kind of non-isolated negative pressure output control circuit and control method |
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