CN2335307Y - Guasi-resonating dc high-voltage generator with 75% high-voltage measuring button - Google Patents
Guasi-resonating dc high-voltage generator with 75% high-voltage measuring button Download PDFInfo
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- CN2335307Y CN2335307Y CN 97218200 CN97218200U CN2335307Y CN 2335307 Y CN2335307 Y CN 2335307Y CN 97218200 CN97218200 CN 97218200 CN 97218200 U CN97218200 U CN 97218200U CN 2335307 Y CN2335307 Y CN 2335307Y
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Abstract
The utility model relates to a quasi-resonating dc high voltage generator with a button for measuring 75 percent of high voltage, which is composed of a front level pulse-width modulation full bridge voltage regulator, a rear level quasi-resonating full bridge driver, a voltage doubler rectifier, and a reference voltage regulating circuit. The front level and the rear level voltage stabilizations are used, and the rear level is provided with an LC quasi-resonating type full bridge voltage raising driver and a button for measuring 75 percent of high voltage. The utility model has the advantages of simple operation, high efficiency, high reliability and high stability and is suitable for the measurement of leakage current in the field of an electric power system high voltage test.
Description
The utility model is a kind of quasi-resonance high voltage direct current generator that has 75% high-tension measurement button in the electric power system high voltage test field, form, and on guidance panel, have 75% high-tension measurement button by prime pulse-width modulation full-bridge voltage regulator, back level quasi-resonance full bridge driver, voltage-doubler rectifier, reference voltage regulating circuit.
Known measurement is all adopted single-stage PWM-type switch driver with high voltage direct current generator, because its voltage waveform is the abundant square wave of high fdrequency component, and voltage-doubler rectifier is a capacitive load for driver, a great current spike appears when this just makes each unlatching cycle of switch driver begin, this current spike usually makes step-up transformer magnetic flux saturated and make its serious heating, and make the driving tube overcurrent and damage, cause that high voltage direct current generator efficient is low, the reliability variation, ripple is big, voltage stability is poor.
In the electric power system high voltage test, often use high voltage direct current generator in order to measure the dc leakage-current of high-tension apparatus, particularly for zinc oxide arrester, measure reference voltage level V
1mALeakage current values under 75% voltage of (by direct current 1mA electric current time magnitude of voltage).When original high voltage direct current generator is measured zinc oxide arrester, write down the reference voltage level V of this moment in the time of being raised to high-tension current earlier for 1mA
1mA, calculate V again
1mA* 75% magnitude of voltage, and then voltage transferred to this value, the leakage current when reading this magnitude of voltage, to judge that whether qualified lightning arrester is, operating process is more loaded down with trivial details.
The purpose of this utility model is in order to overcome above-mentioned deficiency and to simplify the complicated processes of test zinc oxide arrester and design a kind of high efficiency, high reliability, high voltage stability, low ripple, high voltage direct current generator simple to operate.
The purpose of this utility model realizes by following circuit structure:
The quasi-resonance high voltage direct current generator that has 75% high-tension measurement button is made up of prime pulse-width modulation full-bridge voltage regulator, back level quasi-resonance full bridge driver, voltage-doubler rectifier, reference voltage regulating circuit.Power frequency AC becomes 0～200 volt adjustable low-voltage DC after the rectification of prime pulse-width modulation full-bridge voltage regulator, filtering, pwm switch voltage stabilizing, output to back level quasi-resonance full bridge driver, through after become the quasi sine high-frequency alternating current of about 10,000 volts peak after the inversion of level quasi-resonance full bridge driver, be added to the voltage-doubler rectifier input, at the output output high voltage direct current of voltage-doubler rectifier.The output voltage of level before and after the reference voltage regulating circuit is measured carries out error ratio with the reference voltage of setting up, and the work pulsewidth of level before and after the control plays the effect of voltage stabilizing and pressure regulation respectively.
The reference voltage regulating circuit is made up of pressure regulation potentiometer, partial pressure potential device, 75% high-tension measurement button, prime error comparator, back level error comparator, prime measuring resistance voltage divider, back level measuring resistance voltage divider and voltage measurement inverter.Switch by pressure regulation potentiometer and the determined reference voltage of partial pressure potential device by 75% high-tension measurement button, the prime measuring voltage that obtains at prime error comparator and prime measuring resistance voltage divider respectively, and the back level measuring voltage that obtains at back level error comparator and back level measuring resistance voltage divider and voltage measurement inverter compares, the error signal that obtains is controlled the work pulsewidth of prime pulse-width modulation full-bridge voltage regulator and back level quasi-resonance full bridge driver respectively, reaches the purpose of voltage stabilizing and 75% high-tension measurement.The input of partial pressure potential device is to be connected on the regulating arm output of pressure regulation potentiometer, forms the 75% fixed partial pressure ratio of any reference voltage of being set up by the pressure regulation potentiometer.For conveniently using and operating, 75% high-tension measurement button is installed on the guidance panel of this high voltage direct current generator.
In the loop of back level quasi-resonance full bridge driver, be serially connected with the resonant capacitance harmony in the quasi-resonant switching state.Resonant capacitance is to be composited by CBB electric capacity and the parallel connection of terylene high frequency capacitance, in order to reduce high-frequency loss, improves the conversion efficiency of high-voltage D.C. generator.Resonant inductance is to form with enamelled wire spaced winding on bar saltire insulation framework, and this structure is easy to dispel the heat and the adjustment of inductance value.The resonance frequency of LC resonant circuit is 1/2～1/4 of a back level quasi-resonance full bridge driver operating frequency.
Description of drawings of the present utility model:
Fig. 1 is a circuit diagram of the present utility model, [1] prime pulse-width modulation full-bridge voltage regulator among the figure, [2] back level quasi-resonance full bridge driver, [3] voltage-doubler rectifier, [4] reference voltage regulating circuit, [5] prime measuring resistance voltage divider, [6] prime error comparator, [7] back level measuring resistance voltage divider, [8] back level error comparator, [9] 75% high-tension measurement buttons, [10] pressure regulation potentiometer, [11] partial pressure potential device, [12] voltage measurement inverter, [13] resonant capacitance, [14] resonant inductance, [15] high-frequency step-up transformer.
Operation principle below in conjunction with the description of drawings circuit:
Prime pulse-width modulation full-bridge voltage regulator [1] is a kind of common PWM type switch voltage controller power source circuit, power frequency AC is after prime pulse-width modulation full-bridge voltage regulator [1] rectification, filtering, pwm switch voltage stabilizing, become adjustable low-voltage DC+Vt of 0～200 volt, output to back level quasi-resonance full bridge driver [2].Back level quasi-resonance full bridge driver [2] is a kind of quasi-resonance state of switch circuit that works in, and the operating voltage waveform is similar to sine wave, and its output high frequency transformer is the high-frequency step-up transformer [15] of a hypermutation ratio.Direct voltage+Vt through after after level quasi-resonance full bridge driver [2] and high-frequency step-up transformer [15] inversion, become the quasi sine high-frequency alternating current of about 10,000 volts peak, be added to the input of voltage-doubler rectifier [3], at the output output high voltage direct current of voltage-doubler rectifier [3].The output voltage of level before and after reference voltage regulating circuit [4] is measured carries out error ratio with the reference voltage of setting up, and the work pulsewidth of level before and after the control plays the effect of voltage stabilizing and pressure regulation respectively.
By determined reference voltage Va of pressure regulation potentiometer [10] and the reference voltage Vb that determines from the Va dividing potential drop by the partial pressure potential device, and switch by 75% high-tension measurement button [9] and to select to produce reference voltage Vc.Prime output voltage+Vt produces the prime measurement signal voltages through prime measuring resistance voltage divider [5], by prime error comparator [6] and reference voltage Vc relatively after, the pulsewidth of control prime pulse-width modulation full-bridge voltage regulator [1], make prime output voltage+Vt and the proportional variation of reference voltage Vc, reach the purpose of switch pressure regulation and voltage stabilizing.
Level output negative dc high voltage-HV in back is grade measurement signal voltages after back level measuring resistance voltage divider [7] and voltage measurement inverter [12] produce, by back level error comparator [8] and reference voltage Vc relatively after, the pulsewidth of the back level booster circuit that control back level quasi-resonance full bridge driver [2] and voltage-doubler rectifier [3] are formed makes back level output negative dc high voltage-HV and the proportional variation of reference voltage Vc.
The determined reference voltage Va of pressure regulation potentiometer [10] can adjust to from 0V+Vcc, the reference voltage Vb that partial pressure potential device [11] is determined from the Va dividing potential drop follows the variation of Va voltage, it is the 75% fixed partial pressure ratio of Va voltage, thereby reference voltage Va is at any magnitude of voltage, when 75% high-tension measurement button [9] was selected reference voltage Vb, reference voltage Vc was exactly 75% branch pressure voltage that reference voltage Va sets up voltage.The variation that prime output voltage+Vt and back level output negative dc high voltage-HV just follow reference voltage Vc produces the output voltage of 75% fixed partial pressure ratio, thereby realizes the singly-bound handoff functionality of 75% fixed partial pressure specific output voltage.In the leakage current operating process of measuring zinc oxide arrester, only need regulate pressure regulation potentiometer [10], the V when the level output current was 1mA after level output negative dc high voltage-HV reached after making
1mA, press 75% high-tension measurement button [9] then, output voltage is adjusted to 75% magnitude of voltage of reference voltage automatically, and the leakage current values that the back level output current value of reading this moment is zinc oxide arrester has realized zinc oxide arrester DC reference voltage V
1mAThe automatic measurement of * 75% leakage current values.
Because voltage-doubler rectifier [3] generally is to be formed by kenotron and high-voltage capacitance cascade, belong to capacitive load, and the no-load voltage ratio of high-frequency step-up transformer [15] is higher, has strengthened the capacitance of capacitive load, and causing work wave is that the operating current of generic drive of square wave is very high.The utility model is serially connected with the LC resonant circuit that resonant capacitance [13] and resonant inductance [14] are composed in series in the circuit loop of back level quasi-resonance full bridge driver [2].Make back level quasi-resonance full bridge driver [2] work in the quasi-resonant switching state, its work wave is a quasi-sine-wave, in each work period, makes capacitive load have suitable charging and discharging currents, reduce the operating current of back level quasi-resonance full bridge driver [2] greatly, improved efficient.Resonant capacitance [13] is to be composited with high-frequency loss little CBB electric capacity and the parallel connection of terylene high frequency capacitance, in order to reduce high-frequency loss, further improves the efficient of high pressure generator.Resonant inductance [14] is that the high strength enamelled wire spaced winding on bar saltire insulation framework with strands forms, and this structure is easy to the heat radiation of resonant inductance [14] and the adjustment of inductance value.The too high or too low advantage that all can not bring into play the quasi-resonance circuit effectively of the resonance frequency of LC resonant circuit, even can not starting of oscillation.Through testing the resonance frequency of determining the LC resonant circuit 1/2～1/4 the best for back grade quasi-resonance full bridge driver [2] operating frequency.
Claims (4)
1. a quasi-resonance high voltage direct current generator that has 75% high-tension measurement button is made up of prime pulse-width modulation full-bridge voltage regulator, back level quasi-resonance full bridge driver, voltage-doubler rectifier, reference voltage regulating circuit; It is characterized in that:
(1) the reference voltage regulating circuit is made up of pressure regulation potentiometer, partial pressure potential device, 75% high-tension measurement button, prime error comparator, back level error comparator, prime measuring resistance voltage divider, back level measuring resistance voltage divider and voltage measurement inverter; Switch by pressure regulation potentiometer and the determined reference voltage of partial pressure potential device by 75% high-tension measurement button, the prime measuring voltage that obtains at prime error comparator and prime measuring resistance voltage divider respectively, and the back level measuring voltage that obtains at back level error comparator and back level measuring resistance voltage divider and voltage measurement inverter compares, the error signal that obtains is controlled the work pulsewidth of prime pulse-width modulation full-bridge voltage regulator and back level quasi-resonance full bridge driver respectively, reaches the purpose of voltage stabilizing and 75% high-tension measurement;
(2) back level quasi-resonance full bridge driver works in the quasi-resonant switching state, has the LC resonant circuit that resonant capacitance and resonant inductance are composed in series in its circuit loop.
2. the quasi-resonance high voltage direct current generator that has 75% high-tension measurement button as claimed in claim 1 is characterized in that 75% high-tension measurement button is mounted in the diverter switch on the quasi-resonance high voltage direct current generator guidance panel that has 75% high-tension measurement button.
3. the quasi-resonance high voltage direct current generator that has 75% high-tension measurement button as claimed in claim 1, the input that it is characterized in that the partial pressure potential device is to be connected on the regulating arm output of pressure regulation potentiometer, forms the 75% fixed partial pressure ratio of any reference voltage of being set up by the pressure regulation potentiometer.
4. the quasi-resonance high voltage direct current generator that has 75% high-tension measurement button as claimed in claim 1, it is characterized in that resonant capacitance is to be composited by CBB electric capacity and the parallel connection of terylene high frequency capacitance, resonant inductance is to form with enamelled wire spaced winding on bar saltire insulation framework, and the resonance frequency of LC resonant circuit is 1/2～1/4 of a back level quasi-resonance full bridge driver operating frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97218200 CN2335307Y (en) | 1997-06-05 | 1997-06-05 | Guasi-resonating dc high-voltage generator with 75% high-voltage measuring button |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97218200 CN2335307Y (en) | 1997-06-05 | 1997-06-05 | Guasi-resonating dc high-voltage generator with 75% high-voltage measuring button |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2335307Y true CN2335307Y (en) | 1999-08-25 |
Family
ID=33934543
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97218200 Expired - Fee Related CN2335307Y (en) | 1997-06-05 | 1997-06-05 | Guasi-resonating dc high-voltage generator with 75% high-voltage measuring button |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2335307Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107329010A (en) * | 2016-04-28 | 2017-11-07 | 江苏新澳电力技术有限公司 | A kind of 10KV arresters automatic checkout system |
-
1997
- 1997-06-05 CN CN 97218200 patent/CN2335307Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107329010A (en) * | 2016-04-28 | 2017-11-07 | 江苏新澳电力技术有限公司 | A kind of 10KV arresters automatic checkout system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |