CN202103597U

CN202103597U - Low-power negative high voltage power supply circuit with start/stop control and low power supply

Info

Publication number: CN202103597U
Application number: CN201120204026XU
Authority: CN
Inventors: 刘云滨; 殷生鸣; 于亮
Original assignee: TIANJIN DONGWEN HIGH VOLTAGE POWER SUPPLY FACTORY
Current assignee: Tianjin Dongwen High Voltage Power Supply Plant
Priority date: 2011-06-16
Filing date: 2011-06-16
Publication date: 2012-01-04
Anticipated expiration: 2021-06-16

Abstract

The utility model relates to a low-power negative high voltage power supply circuit with start/stop control and low power supply. The low-power negative high voltage power supply circuit comprises a self-recovery protection circuit, a voltage doubling rectifying and filtering circuit, a high voltage feedback circuit, an oscillation control and auxiliary drive circuit, and a lifting and start/stop control circuit, wherein the lifting and start/stop control circuit is respectively connected with the oscillation control and auxiliary drive circuit, the self-recovery protection circuit and the high voltage feedback circuit, and the oscillation control and auxiliary drive circuit is respectively connected with the self-recovery protection circuit and the high voltage feedback circuit via the voltage doubling rectifying and filtering circuit. Beneficial effects comprise that the low-power negative high voltage power supply circuit realizes the functions of starting, operating and stopping of a high voltage power supply under a low power supply voltage; a lifting part has a simple circuit structure, a small number of peripheral components, and a simple making process; and the low-power negative high voltage power supply circuit saves space while guarantees the index parameters of the power supply, thereby facilitating the design of a circuit board.

Description

A kind of have start and stop control, a low power supply small-power negative high voltage power source circuit

Technical field

The utility model relates to a kind of field high voltage sourcies such as industry, agricultural, national defence, scientific research and medical treatment that are widely used in, and particularly a kind of have start and stop control, a low power supply small-power negative high voltage power source circuit.

Background technology

Low-power high-voltage power supply product on the market; Most supply power voltage is all than higher, and (in the majority with 10～24V power supply) is along with development of science and technology; Except that constantly reducing overall dimension, reducing the Overall Power Consumption, more and more to the demand of low power supply high voltage power supply product.

Summary of the invention

In order to adapt to development, to meet the need of market, the utility model provides a kind of inside boost design, simple and practical, reliability stable higher have start and stop control, low power supply small-power negative high voltage power source circuit.

The utility model is for realizing above-mentioned purpose; The technical scheme of being taked is: a kind of have start and stop control, a low power supply small-power negative high voltage power source circuit; Comprise self-recovery protection circuit, voltage multiplying rectifier and filter circuit, high pressure feedback circuit; It is characterized in that: also comprise vibration control and process auxiliary drive circuit, lifting and starting or stopping control circuit; Said lifting and starting or stopping control circuit are connected with vibrate control and process auxiliary drive circuit, self-recovery protection circuit, high pressure feedback circuit respectively, and said vibration control and process auxiliary drive circuit are connected with the high pressure feedback circuit with the self-recovery protection circuit respectively through voltage multiplying rectifier and filter circuit; Input+the Vin that supplies power in said lifting and the starting or stopping control circuit meets an end of the positive pole of capacitor C 21, inductance L 2 and resistance R 26, the voltage input end Vin of control chip U4 respectively; The negative pole of capacitor C 21 meets input ground GND; The other end of resistance R 26 connect respectively an end, the triode T5 of capacitor C 2 collector electrode, control chip U4 enable control end SHDN; The other end of capacitor C 2 links to each other with the earth terminal G of control chip U4 and meets input ground GND; The other end of inductance L 2 meets the positive pole of diode D8, the internal switch end SW of control chip U4 respectively; The negative pole of diode D8 is connecting resistance R22, resistance R 23 and an end of resistance R 24 and the positive pole of capacitor C 20 respectively, the collector electrode of another termination triode T4 of resistance R 22, the negative pole of another terminating diode D9 of resistance R 23; The positive pole of diode D9 connects the base stage of triode T4; The other end of resistance R 24 is the end, the feedback input end FB of control chip U4 of connecting resistance R25 respectively, and the negative pole of capacitor C 20 links to each other with the other end of the emitter of triode T4, resistance R 25 respectively and meets input ground GND, and the base stage of triode T5 is distinguished an end of connecting resistance R6, resistance R 27; Another termination input ground GND of resistance R 27, another termination start and stop control end R/S of resistance R 6; 1 end of transformer TRF primary coil Lp connects an end of inductance L 1, the positive pole of capacitor C 3 respectively in said vibration control and the process auxiliary drive circuit; The negative pole of capacitor C 3 meets input ground GND; 1 pin of voltage stabilizing a reference source U3 link to each other with 3 pin and anodal while of the end of connecting resistance R2 and capacitor C 4 again as reference voltage output end Vref; The negative pole of capacitor C 4 links to each other with 2 pin of voltage stabilizing a reference source U3 and meets input ground GND; One end of resistance R 1 connect respectively diode D1 negative pole, capacitor C 5 positive pole, resistance R 3 and resistance R 5 an end, control chip U1 8 pin and as in-line power end Vcc; Resistance R 1 links to each other with the other end of resistance R 2 and connects the negative pole of diode D8 in the other end, lifting and the starting or stopping control circuit of inductance L 1; The drain electrode of the 2 termination triode T1 of transformer TRF primary coil Lp; Resistance R 7 is parallelly connected with diode D4, and the grid of triode T1 connects the positive pole of diode D4 and an end of capacitor C 6 respectively, the negative pole of diode D4 connect control chip U1 3 pin; The other end of capacitor C 6 links to each other with the source electrode of triode T1 and meets input ground GND; The other end of resistance R 3 respectively connecting resistance R4 an end and control chip U1 7 pin, the other end of resistance R 4 connect respectively capacitor C 1 an end, control chip U1 2 pin and 6 pin, the other end of capacitor C 1 respectively with the emitter of triode T3, control chip U1 1 pin link to each other and connect import GND; The other end of resistance R 5 connect respectively triode T3 collector electrode, control chip U1 4 pin, the base stage of triode T3 connect promote and starting or stopping control circuit in the collector electrode of triode T4.

The beneficial effect of the utility model is: realize startup, work and the closing function of high voltage source under low suppling voltage; The circuit of lift portion is simple, and peripheral component is few, is easy to make; Under the situation that guarantees power supply each item index parameter, save the space, be convenient to the design of circuit board.

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; A kind of have start and stop control, a low power supply small-power negative high voltage power source circuit; Comprise self-recovery protection circuit, voltage multiplying rectifier and filter circuit, high pressure feedback circuit; Also comprise vibration control and process auxiliary drive circuit, lifting and starting or stopping control circuit; Lifting and starting or stopping control circuit are connected with vibrate control and process auxiliary drive circuit, self-recovery protection circuit, high pressure feedback circuit respectively, and vibration control and process auxiliary drive circuit pass through voltage multiplying rectifier and filter circuit is connected with the high pressure feedback circuit with the self-recovery protection circuit respectively; Input+the Vin that supplies power in lifting and the starting or stopping control circuit meets an end of positive pole, inductance L 2 and the resistance R 26 of capacitor C 21, the voltage input end Vin of control chip U4 respectively; The negative pole of capacitor C 21 meets input ground GND; The other end of resistance R 26 connect respectively an end, the triode T5 of capacitor C 2 collector electrode, control chip U4 enable control end SHDN; The other end of capacitor C 2 links to each other with the earth terminal G of control chip U4 and meets input ground GND; The other end of inductance L 2 meets the positive pole of diode D8, the internal switch end SW of control chip U4 respectively; The negative pole of diode D8 is connecting resistance R22, resistance R 23 and an end of resistance R 24 and the positive pole of capacitor C 20 respectively, the collector electrode of another termination triode T4 of resistance R 22, the negative pole of another terminating diode D9 of resistance R 23; The positive pole of diode D9 connects the base stage of triode T4; The other end of resistance R 24 is the end, the feedback input end FB of control chip U4 of connecting resistance R25 respectively, and the negative pole of capacitor C 20 links to each other with the other end of the emitter of triode T4, resistance R 25 respectively and meets input ground GND, and the base stage of triode T5 is distinguished an end of connecting resistance R6, resistance R 27; Another termination input ground GND of resistance R 27, another termination start and stop control end R/S of resistance R 6; 1 end of transformer TRF primary coil Lp connects an end of inductance L 1, the positive pole of capacitor C 3 respectively in said vibration control and the process auxiliary drive circuit; The negative pole of capacitor C 3 meets input ground GND; 1 pin of voltage stabilizing a reference source U3 link to each other with 3 pin and anodal while of the end of connecting resistance R2 and capacitor C 4 again as reference voltage output end Vref; The negative pole of capacitor C 4 links to each other with 2 pin of voltage stabilizing a reference source U3 and meets input ground GND; One end of resistance R 1 connect respectively diode D1 negative pole, capacitor C 5 positive pole, resistance R 3 and resistance R 5 an end, control chip U1 8 pin and as in-line power end Vcc; Resistance R 1 links to each other with the other end of resistance R 2 and connects the negative pole of diode D8 in the other end, lifting and the starting or stopping control circuit of inductance L 1; The drain electrode of the 2 termination triode T1 of transformer TRF primary coil Lp; Resistance R 7 is parallelly connected with diode D4, and the grid of triode T1 connects the positive pole of diode D4 and an end of capacitor C 6 respectively, and the negative pole of diode D4 connects 3 pin of control chip U1; The other end of capacitor C 6 links to each other with the source electrode of triode T1 and meets input ground GND; The other end of resistance R 3 is the end and 7 pin of control chip U1 of connecting resistance R4 respectively, and the other end of resistance R 4 connects an end of capacitor C 1,2 pin and 6 pin of control chip U1 respectively, the other end of capacitor C 1 link to each other with 1 pin of the emitter of triode T3, control chip U1 respectively and connect import GND; The other end of resistance R 5 connects the collector electrode of triode T3,4 pin of control chip U1 respectively, and the base stage of triode T3 connects the collector electrode of triode T4 in lifting and the starting or stopping control circuit.

Voltage lifting circuit adopts SP6691 low-power consumption boost type DC-DC power supply changeover device chip, and it has, and output ripple is low, switching frequency and conversion efficiency advantages of higher, its boost state of output of control end may command that enables.

Main control circuit adopts SE555 time-base oscillation circuit, and circuit structure is simple, and control is convenient; Novel self-recovery protection circuit when high pressure output overloading or short circuit, is protected high voltage source well.

In this high voltage source production, should select control chip and other components and parts of low noise, low temperature drift, good stability for use; Rational PCB layout is guaranteed the independent pathway between each ' ', avoids crosstalking each other between each signal; Reliability and stability that high voltage source is long-term are guaranteed in good transformer line pack arrangement technology, technique for coiling and High-Voltage Insulation processing etc.

Operation principle

SP6691 control chip U4 is a low-power consumption boost type DC-DC power supply changeover device chip, and there is an integrated high-voltage power supply switch its inside, has very little shutoff quiescent current, and the operating voltage of chip is very low, and enables control end.This chip and inductance L 2, diode D8, resistance R 24 and resistance R 25 etc. are formed booster circuit, with very low supply power voltage rising several times, are that main high pressure DC-DC converter provides normal operating voltage.

Form oscillating circuit by SE555 control chip U1, capacitor C 1, resistance R 3 and resistance R 4 etc.; 3 pin output oscillation pulse signal from control chip U1; Through triode T1 driving transformer TRF primary coil Lp; Produce the high frequency of oscillation alternating voltage, and produce induced potential, be coupled to its secondary high-tension coil Ls through transformer TRF at its two ends; And behind the voltage multiplying rectifier and filter circuit via compositions such as diode D5, diode D6 and capacitor C 15, capacitor C 16, capacitor C 17, the high direct voltage of output smoothing.

High pressure sampled signal from feedback resistance R11, resistance R 19, resistance R 20 and capacitor C 10 acquisitions; Current potential with voltage-regulation input Vadj; Through the high pressure feedback circuit of forming by amplifier U2A etc.; Remove to control the 5 pin current potentials of control chip U1, change the frequency and the duty ratio of the 3 pin output pulse of control chip U1, the output high pressure is stablized.

Output current sampled signal from resistance R 21 obtains moves 6 pin that are added to amplifier U2B through resistance R 15 and through level, with the benchmark partial pressure potential of resistance R that is added to amplifier U2B 5 pin 16 and resistance R 17, and control amplifier U2B output.When the mean value of output current during greater than set point, 7 pin of amplifier U2B are high potential, and give capacitor C 11 chargings and be full of through diode D3 moment; Make triode T2 conducting through resistance R 13 simultaneously, the 5 pin current potentials of control chip U1 are pulled near zero potential, and then closing control output pulse; High pressure output is descended rapidly, and the mean value of output current is less than set point at this moment, and 7 pin of amplifier U2B become electronegative potential; Capacitor C 11 is slowly discharged through resistance R 13, triode T2; T2 ends until triode, and the 5 pin current potentials of control chip U1 also slowly rise, and high pressure output is risen gradually.

In addition, when when start and stop control end R/S adds a high level, the SHDN of SP6691 converter chip end is low level, and the work of boosting this moment stops, and triode T4 ends and triode T3 conducting, thereby closes high pressure output; 1 pair of high frequency of oscillation alternating voltage of inductance L plays the isolation barrier effect, reduces the interference of high-frequency ac working pulse to control circuit and supply power voltage.

Claims

1. one kind has start and stop control, low power supply small-power negative high voltage power source circuit; Comprise self-recovery protection circuit, voltage multiplying rectifier and filter circuit, high pressure feedback circuit; It is characterized in that: also comprise vibration control and process auxiliary drive circuit, lifting and starting or stopping control circuit; Said lifting and starting or stopping control circuit are connected with vibrate control and process auxiliary drive circuit, self-recovery protection circuit, high pressure feedback circuit respectively, and said vibration control and process auxiliary drive circuit are connected with the high pressure feedback circuit with the self-recovery protection circuit respectively through voltage multiplying rectifier and filter circuit;

Input+the Vin that supplies power in said lifting and the starting or stopping control circuit meets an end of the positive pole of capacitor C 21, inductance L 2 and resistance R 26, the voltage input end Vin of control chip U4 respectively; The negative pole of capacitor C 21 meets input ground GND; The other end of resistance R 26 connect respectively an end, the triode T5 of capacitor C 2 collector electrode, control chip U4 enable control end SHDN; The other end of capacitor C 2 links to each other with the earth terminal G of control chip U4 and meets input ground GND; The other end of inductance L 2 meets the positive pole of diode D8, the internal switch end SW of control chip U4 respectively; The negative pole of diode D8 is connecting resistance R22, resistance R 23 and an end of resistance R 24 and the positive pole of capacitor C 20 respectively, the collector electrode of another termination triode T4 of resistance R 22, the negative pole of another terminating diode D9 of resistance R 23; The positive pole of diode D9 connects the base stage of triode T4; The other end of resistance R 24 is the end, the feedback input end FB of control chip U4 of connecting resistance R25 respectively, and the negative pole of capacitor C 20 links to each other with the other end of the emitter of triode T4, resistance R 25 respectively and meets input ground GND, and the base stage of triode T5 is distinguished an end of connecting resistance R6, resistance R 27; Another termination input ground GND of resistance R 27, another termination start and stop control end R/S of resistance R 6;

1 end of transformer TRF primary coil Lp connects an end of inductance L 1, the positive pole of capacitor C 3 respectively in said vibration control and the process auxiliary drive circuit; The negative pole of capacitor C 3 meets input ground GND; 1 pin of voltage stabilizing a reference source U3 link to each other with 3 pin and anodal while of the end of connecting resistance R2 and capacitor C 4 again as reference voltage output end Vref; The negative pole of capacitor C 4 links to each other with 2 pin of voltage stabilizing a reference source U3 and meets input ground GND; One end of resistance R 1 connect respectively diode D1 negative pole, capacitor C 5 positive pole, resistance R 3 and resistance R 5 an end, control chip U1 8 pin and as in-line power end Vcc; Resistance R 1 links to each other with the other end of resistance R 2 and connects the negative pole of diode D8 in the other end, lifting and the starting or stopping control circuit of inductance L 1; The drain electrode of the 2 termination triode T1 of transformer TRF primary coil Lp; Resistance R 7 is parallelly connected with diode D4, and the grid of triode T1 connects the positive pole of diode D4 and an end of capacitor C 6 respectively, and the negative pole of diode D4 connects 3 pin of control chip U1; The other end of capacitor C 6 links to each other with the source electrode of triode T1 and meets input ground GND; The other end of resistance R 3 is the end and 7 pin of control chip U1 of connecting resistance R4 respectively, and the other end of resistance R 4 connects an end of capacitor C 1,2 pin and 6 pin of control chip U1 respectively, the other end of capacitor C 1 link to each other with 1 pin of the emitter of triode T3, control chip U1 respectively and connect import GND; The other end of resistance R 5 connects the collector electrode of triode T3,4 pin of control chip U1 respectively, and the base stage of triode T3 connects the collector electrode of triode T4 in lifting and the starting or stopping control circuit.