CN109412424B - Amplitude and frequency adjustable high-voltage sine wave power supply circuit and implementation method - Google Patents
Amplitude and frequency adjustable high-voltage sine wave power supply circuit and implementation method Download PDFInfo
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- CN109412424B CN109412424B CN201811572616.0A CN201811572616A CN109412424B CN 109412424 B CN109412424 B CN 109412424B CN 201811572616 A CN201811572616 A CN 201811572616A CN 109412424 B CN109412424 B CN 109412424B
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- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000012545 processing Methods 0.000 claims abstract description 53
- 230000003321 amplification Effects 0.000 claims abstract description 45
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 45
- 230000001105 regulatory effect Effects 0.000 claims abstract description 15
- 238000006243 chemical reaction Methods 0.000 claims abstract description 14
- 239000003990 capacitor Substances 0.000 claims description 24
- 102000007315 Telomeric Repeat Binding Protein 1 Human genes 0.000 claims description 6
- 108010033711 Telomeric Repeat Binding Protein 1 Proteins 0.000 claims description 6
- 238000004804 winding Methods 0.000 claims 1
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 abstract description 20
- 239000011787 zinc oxide Substances 0.000 abstract description 10
- 238000001514 detection method Methods 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 11
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
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- 238000011835 investigation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention relates to a high-voltage sine wave power supply circuit with adjustable amplitude and frequency and an implementation method thereof, when Alternating Current (AC) 220V is input, the power supply is provided for a power amplifying circuit through an AC/DC conversion circuit, the output of the power amplifying circuit is connected to the primary of a transformer, the output of the power amplifying circuit is boosted through the transformer, and the output end of the power amplifying circuit is connected with a lightning arrester valve plate. Meanwhile, voltage and current signals are acquired from the output end of the power amplification circuit, are fed back to the single chip microcomputer signal processing circuit through the acquisition signal processing circuit, and are compared with feedback signals through set signals to output sine waves of 0-1V and are connected to the power amplification circuit, so that closed loop control of the circuit is achieved. The power supply provides high voltage for voltage and current characteristic detection of the zinc oxide arrester, the amplitude of the power supply is regulated to an effective value of 10kv of alternating current from 0V, the effective output power can reach 100W, the whole course of output frequency accuracy can reach 0.05%, and the frequency can be regulated to 700Hz from 45 Hz.
Description
Technical Field
The invention relates to a high-voltage sine wave power circuit with adjustable amplitude and frequency for detecting the voltage and current characteristics of a zinc oxide arrester valve plate and used in the field of lightning protection of an electric power system and an implementation method thereof.
Background
Zinc oxide arresters are widely used in electrical power systems due to their good non-linear characteristics. In recent years, zinc oxide arresters have been exposed to explosion due to, for example, moisture caused by poor sealing during operation, and have been subjected to large-area power failure. And through the results of on-line monitoring and live testing, whether a power failure is caused or not is determined to carry out a direct current test, and whether the zinc oxide arrester has the defects of damp and the like is further determined.
However, although the direct current test is sensitive and effective, there is a bottleneck that the direct current characteristic and the alternating current characteristic of the zinc oxide material are different, and the voltage distribution situation of the direct current and the alternating current in the lightning arrester is also different, and the single direct current test cannot detect the insulation condition under the operation voltage, so that the alternating current leakage test on the zinc oxide lightning arrester is very important.
The high-voltage power supply circuit for providing alternating current for the zinc oxide lightning arrester in the market has large manufacturing difficulty and mostly unadjustable frequency, so that the comprehensiveness and accuracy of the alternating current test are reduced.
Disclosure of Invention
In view of the state of the art and the urgent need in the lightning protection field of the current power system, the invention provides a high-voltage sine wave power supply circuit with adjustable amplitude and frequency and an implementation method thereof, wherein the power supply circuit provides alternating voltage for a zinc oxide lightning arrester valve plate, the amplitude and frequency of the alternating voltage are adjustable, so that the alternating test of the lightning arrester is more comprehensive, and the result is more accurate.
The technical scheme adopted by the invention for realizing the purposes is as follows: the utility model provides an amplitude, frequency adjustable high voltage sine wave power supply circuit, includes AC/DC conversion circuit, power amplification circuit, transformer, singlechip signal processing circuit, its characterized in that: the system also comprises an acquisition signal processing circuit; the AC/DC conversion circuit is connected with the power amplification circuit, the power amplification circuit is respectively connected with the singlechip signal processing circuit, the transformer and the acquisition signal processing circuit, the acquisition signal processing circuit is connected with the singlechip signal processing circuit, and the secondary of the transformer directly outputs high voltage;
The acquisition signal processing circuit is specifically connected with: one end of a resistor R4 is connected with the output end Vo of the power amplifying circuit and one end of a switch S1 of the circuit, the other end of the resistor R4 is respectively connected with one end of a resistor R5, the other end of the switch S1 and the primary end of a transformer TRF1, the other end of the resistor R5 is respectively connected with one end of a capacitor C4 and 1 pin of a potentiometer W1, the other end of the capacitor C4 is connected with the ground, 2 pins and 3 pins of the potentiometer W1 are respectively connected with one end of an amplifier U2A, one end of a resistor R6 and one end of a resistor R7 after being short-circuited, the other end of the resistor R7 is respectively connected with the cathode of a diode D2 and one end of a resistor R8, the other end of the resistor R6 is respectively connected with the anode of a diode D3 and the 5 pins of an amplifier U2B, the cathode of the diode D3 is connected with the anode of the diode D2 and then connected with the 1 pin of the amplifier U2A, the 3 pins and 4 pins of the amplifier U2A are connected with the ground, the other end of the resistor R8 is respectively connected with one end of the resistor R9 and the 6 pins of the amplifier U2B, the other end of the resistor R9 is respectively connected with the 7 pin of the amplifier U2B, one end of the resistor R10 and the 1 pin of the potentiometer W3, the other end of the resistor R10 is respectively connected with the 2 pin of the amplifier U3A, the resistor R11 and one end of the capacitor C5, the other end of the resistor R11 is respectively connected with the 1 pin of the amplifier U3A, the resistor R12, one end of the resistor R13 and the 3 pin of the potentiometer W3, the 3 pin and the 4 pin of the amplifier U3 are connected with the ground, the output signal Vdis at the other end of the resistor R12 is connected with the Vdis in the singlechip signal processing circuit, the 2 pin of the potentiometer W3 is connected with one end of the resistor R17, the other end of the resistor R13 is respectively connected with one end of the capacitor C6 and the 6 pin of the amplifier U3B, the other end of the capacitor C6 is respectively connected with the 7 pin of the amplifier U3B and the 1 pin of the potentiometer W2, the 3 pin of the potentiometer W2 is connected with the ground, the 2 pin of the potentiometer W2 is connected with the 3 pin of the chip U1 in the power amplifying circuit, the 5 pin of the potentiometer U3B is respectively connected with the capacitor C7 and the resistor R14, the other end of the capacitor C7 is connected with the ground, the other end of the resistor R14 is connected with the 6 pin of the chip U11 in the singlechip signal processing circuit, the other end of the resistor R17 is respectively connected with one end of the capacitor C8, the resistor R16, the resistor R18 and one end of the resistor R19, the other end of the capacitor C8 is respectively connected with one end of the resistor R15 and the primary other end of the transformer TRF1, the other ends of the resistor R15 and the resistor R18 are connected with the ground, the other end of the resistor R19 is connected with the 3 pin of the amplifier U4A, the other end of the resistor R16 is connected with the 2 pin of the potentiometer W4, the 1 pin of the potentiometer W4 is connected with the ground, the 3 pin of the potentiometer W4 is connected with the 8 pin of the chip U1 in the power amplification circuit, the 4A 2 pin of the amplifier U4A is connected with the 2 pin of the potentiometer W5, the 1 pin of the potentiometer W5 is connected with the ground, the 3 pin of the potentiometer W5 is respectively connected with the positive electrode of the diode D4 through the resistor R20, one end of the resistor R21, the other end of the diode D4 is connected with the 1 pin of the amplifier U4A, the other end of the resistor R21 is connected with the other end of the resistor U4 is connected with the resistor U4A, the other end of the resistor R22 and the resistor C9 and the other end of the resistor U4 is connected with the resistor U4I 4B 4 through the resistor C9 and the resistor B7;
One end of a Relay and one end of a resistor R23 are respectively connected with +24V in the AC/DC conversion circuit, the other end of the Relay is connected with the collector electrode of a triode T1, the other end of the resistor R23 is connected with the base electrode of the triode T1, and the emitter electrode of the triode T1 is connected with the ground;
the models of the amplifier U2A, the amplifier U2B, the amplifier U3A, the amplifier U3B, the amplifier U4A and the amplifier U4B are LM358.
A realization method of a high-voltage sine wave power supply circuit with adjustable amplitude and frequency is characterized in that: when alternating current AC220V is input, the alternating current AC220V is converted into DC24V and DC + -48V through an AC/DC conversion circuit, the DC + -48V supplies power for a power amplification circuit, the DC24V is converted into DC12V through DC/DC, the power amplification circuit supplies power for an amplifier and a singlechip signal processing circuit, the output end of the power amplification circuit is connected to the primary of a transformer, the output end of the power amplification circuit is boosted through the transformer and is connected with a lightning arrester valve plate, voltage and current signals are collected from the output end of the power amplification circuit, the voltage and current signals are fed back to the singlechip signal processing circuit through a collection signal processing circuit, a set signal is compared with a feedback signal, the singlechip signal processing circuit outputs sine waves of 0-1V through a 14 pin of a chip U7, the singlechip signal processing circuit is provided with required frequency through program assembly, the potentiometer W5 of the collection signal processing circuit adjusts the output amplitude gain, the sine waves are input into a main circuit of the power amplification circuit through a1 pin of the power amplification circuit chip U1, and the input sine wave signals are amplified through the circuit and are output with 36 times of amplification power; the method comprises the steps of collecting and processing an alternating current signal at the output end of a power amplification circuit, obtaining a negative pressure signal after full-wave rectification of an absolute value amplification circuit by an collected standard sine wave signal, outputting a DC4V voltage feedback signal Vdis after passing through a zero comparator, regulating the voltage amplitude of the Vdis by regulating a potentiometer W1, inputting the Vdis to a singlechip signal circuit, outputting a Vadj signal and the Vdis by the singlechip signal processing circuit as two comparison signals of an amplifier U3B, feeding back the comparison result to the 3 pin of the power amplification circuit chip U1 through the 7 pin of the amplifier U3B, and regulating the output state of the power amplification circuit to form a complete control loop.
The beneficial effects of the invention are as follows: the invention is a high-voltage sine wave power supply circuit with adjustable amplitude and frequency, which can effectively improve the comprehensiveness and accuracy of alternating current test, the amplitude of the power supply is adjusted to 10kv (effective value) of alternating current from 0V, the effective output power can reach 100W, the whole course of the output frequency precision can reach 0.05 percent, the frequency adjustment range is wide, the frequency adjustment range is adjustable to 700Hz, the wide-range adjustment can meet various test requirements during the alternating current test, various sine wave power supplies with fixed amplitude and fixed frequency can be considered, the alternating current test is more convenient and effective, thereby improving the fault investigation efficiency and the accuracy of the power system, and providing theoretical basis for the improvement of a zinc oxide arrester.
Drawings
FIG. 1 is a schematic block diagram of the present invention;
Fig. 2 is a schematic diagram of the circuit of the present invention.
Detailed Description
As shown in fig. 1 and 2, a high-voltage sine wave power supply circuit with adjustable amplitude and frequency comprises an AC/DC conversion circuit, a power amplifying circuit, a transformer and a singlechip signal processing circuit, and is characterized in that: the system also comprises an acquisition signal processing circuit. The AC/DC conversion circuit is connected with the power amplification circuit, the power amplification circuit is respectively connected with the singlechip signal processing circuit, the transformer and the acquisition signal processing circuit, the acquisition signal processing circuit is connected with the singlechip signal processing circuit, and the secondary of the transformer directly outputs high voltage.
As shown in fig. 1 and 2, the acquisition signal processing circuit is specifically connected to: one end of a resistor R4 is connected with the output end Vo of the power amplifying circuit and one end of a switch S1 of the circuit, the other end of the resistor R4 is respectively connected with one end of a resistor R5, the other end of the switch S1 and the primary end of a transformer TRF1, the other end of the resistor R5 is respectively connected with one end of a capacitor C4 and 1 pin of a potentiometer W1, the other end of the capacitor C4 is connected with the ground, 2 pins and 3 pins of the potentiometer W1 are respectively connected with one end of an amplifier U2A, one end of a resistor R6 and one end of a resistor R7 after being short-circuited, the other end of the resistor R7 is respectively connected with the cathode of a diode D2 and one end of a resistor R8, the other end of the resistor R6 is respectively connected with the anode of a diode D3 and the 5 pins of an amplifier U2B, the cathode of the diode D3 is connected with the anode of the diode D2 and then connected with the 1 pin of the amplifier U2A, the 3 pins and 4 pins of the amplifier U2A are connected with the ground, the other end of the resistor R8 is respectively connected with one end of the resistor R9 and the 6 pins of the amplifier U2B, the other end of the resistor R9 is respectively connected with the 7 pin of the amplifier U2B, one end of the resistor R10 and the 1 pin of the potentiometer W3, the other end of the resistor R10 is respectively connected with the 2 pin of the amplifier U3A, the resistor R11 and one end of the capacitor C5, the other end of the resistor R11 is respectively connected with the 1 pin of the amplifier U3A, the resistor R12, one end of the resistor R13 and the 3 pin of the potentiometer W3, the 3 pin and the 4 pin of the amplifier U3 are connected with the ground, the output signal Vdis at the other end of the resistor R12 is connected with the Vdis in the singlechip signal processing circuit, the 2 pin of the potentiometer W3 is connected with one end of the resistor R17, the other end of the resistor R13 is respectively connected with one end of the capacitor C6 and the 6 pin of the amplifier U3B, the other end of the capacitor C6 is respectively connected with the 7 pin of the amplifier U3B and the 1 pin of the potentiometer W2, the 3 pin of the potentiometer W2 is connected with the ground, the 2 pin of the potentiometer W2 is connected with the 3 pin of the chip U1 in the power amplifying circuit, the 5 pin of the potentiometer U3B is respectively connected with the capacitor C7 and the resistor R14, the other end of the capacitor C7 is connected with the ground, the other end of the resistor R14 is connected with the 6 pin of the chip U11 in the singlechip signal processing circuit, the other end of the resistor R17 is respectively connected with one end of the capacitor C8, the resistor R16, the resistor R18 and one end of the resistor R19, the other end of the capacitor C8 is respectively connected with one end of the resistor R15 and the primary other end of the transformer TRF1, the other ends of the resistor R15 and the resistor R18 are connected with the ground, the other end of the resistor R19 is connected with the 3 pin of the amplifier U4A, the other end of the resistor R16 is connected with the 2 pin of the potentiometer W4, the 1 pin of the potentiometer W4 is connected with the ground, the 3 pin of the potentiometer W4 is connected with the 8 pin of the chip U1 in the power amplification circuit, the 4A 2 pin of the amplifier U4A is connected with the 2 pin of the potentiometer W5, the 1 pin of the potentiometer W5 is connected with the ground, the 3 pin of the potentiometer W5 is respectively connected with the positive electrode of the diode D4 through the resistor R20, one end of the resistor R21, the other end of the diode D4 is connected with the 1 pin of the amplifier U4A, the other end of the resistor R21 is connected with the other end of the resistor U4 is connected with the resistor U4A, the other end of the resistor R22 and the resistor C9 and the other end of the resistor U4 is connected with the resistor U4I 4B 4 through the resistor C9 and the resistor B7;
One end of a Relay and one end of a resistor R23 are respectively connected with +24V in the AC/DC conversion circuit, the other end of the Relay is connected with the collector electrode of a triode T1, the other end of the resistor R23 is connected with the base electrode of the triode T1, and the emitter electrode of the triode T1 is connected with the ground.
The acquisition signal processing circuit chip selects the comparator LM358, should consider its offset voltage when selecting, the chip that offset voltage is great need add zero compensation circuit (including in this circuit). For the selection of the potentiometer for compensation and adjustment, the reliability and stability of the potentiometer need to be considered in design because the potentiometer directly influences the accuracy of output voltage.
In the singlechip signal processing circuit, a sine wave control power amplifying circuit with the frequency of 0-1V is output through an AD9851 chip U7, after the sine wave frequency is programmed and set by the singlechip, the control end output of the AD9851 chip U7 is controlled through a C8051F005 chip U6, and the sine wave amplitude can be adjusted through a potentiometer W5.
Vdis in the acquisition signal processing circuit and Vadj in the singlechip signal processing circuit output voltage after passing through a comparator, the voltage is transmitted to an AD633 chip U1 in the power amplifier circuit, the amplitude of an output signal can be adjusted after the chip receives the signal, and the signal is amplified by the power amplifying part, so that the amplitude of the output voltage is adjusted.
When the circuit PCB is designed, primary working current is larger, so that primary power circuit design redundancy should meet primary derating, and circuit loss is reduced. Meanwhile, the heat dissipation of the power device can be considered to be close to the position of the shell or the bottom plate, so that the heat dissipation effect can be enhanced.
The power supply is innovative in that the acquired signals are sine wave alternating current signals, and through loop signal conversion, AC is changed into DC, DC is changed into AC, and AC-DC conversion control circuits, the control mode enables the sampled signals to be low-voltage signals without high-voltage interference, the sampled signals are more stable, a closed loop circuit is controlled more reliably, and the service life of the power supply is prolonged as a whole.
The invention collects signals and selects the signals to be arranged at the primary side of the transformer, thus reducing the difficulty, increasing the reliability of the power supply and not affecting the closed-loop control effect. The acquired sine wave signals are converted into full wave rectification signals through an absolute value circuit, the processed signals are output to direct current voltage through a comparator, and the direct current voltage and Vadj signals in a single chip microcomputer signal processing circuit are output after entering the comparator, so that the amplitude output by a power amplifying circuit is controlled, and a complete closed loop is formed.
The main working principle of the circuit is as follows:
the singlechip signal circuit outputs sine waves of 0-1V, the required frequency is set through program assembly, and the output amplitude gain is regulated through the potentiometer W5;
after passing through pin 1 of the power amplification circuit chip U1, the sine wave is input into a main circuit of the power amplification circuit, and the input sine wave signal is amplified and output through the circuit, wherein the amplification factor is 36 times;
The method comprises the steps of collecting and processing an alternating current signal at the output end of a power amplification circuit, obtaining a negative pressure signal after full-wave rectification of an absolute value amplification circuit by an collected standard sine wave signal, outputting a DC4V feedback signal Vdis after passing through a zero comparator, regulating the voltage amplitude of the Vdis by regulating a potentiometer W1, inputting the Vdis to a singlechip signal circuit, outputting a Vadj signal and the Vdis as two comparison signals of an amplifier U3B by a singlechip signal processing circuit, and feeding back the comparison result to the 3 pins of a power amplification circuit chip U1 through the 7 pins of the amplifier U3B so as to regulate the output state of the power amplification circuit, thereby forming a complete control loop.
Claims (2)
1. The utility model provides an amplitude, frequency adjustable high voltage sine wave power supply circuit, includes AC/DC conversion circuit, power amplification circuit, transformer, singlechip signal processing circuit, its characterized in that: the system also comprises an acquisition signal processing circuit; the AC/DC conversion circuit is connected with the power amplification circuit, the power amplification circuit is respectively connected with the singlechip signal processing circuit, the transformer and the acquisition signal processing circuit, the acquisition signal processing circuit is connected with the singlechip signal processing circuit, and the secondary of the transformer directly outputs high voltage;
The acquisition signal processing circuit is specifically connected with: one end of a resistor R4 is connected with the output end Vo of the power amplifying circuit and one end of a switch S1 of the circuit, the other end of the resistor R4 is respectively connected with one end of a resistor R5, the other end of the switch S1 and the primary end of a transformer TRF1, the other end of the resistor R5 is respectively connected with one end of a capacitor C4 and 1 pin of a potentiometer W1, the other end of the capacitor C4 is connected with the ground, the 2 pin adjusting end and 3 pin of the potentiometer W1 are respectively connected with one end of an amplifier U2A, a resistor R6 and one end of a resistor R7 after being short-circuited, the other end of the resistor R7 is respectively connected with the cathode of a diode D2 and one end of a resistor R8, the other end of the resistor R6 is respectively connected with the anode of a diode D3 and the 5 pin of an amplifier U2B, the cathode of the diode D3 is connected with the anode of the diode D2 and then connected with the 1 pin of the amplifier U2A, the 3 pin and 4 pin of the amplifier U2A are connected with the ground, the other end of the resistor R8 is respectively connected with one end of the resistor R9 and the 6 pin of the amplifier U2B, the other end of the resistor R9 is respectively connected with the 7 pin of the amplifier U2B, one end of the resistor R10 and the 1 pin of the potentiometer W3, the other end of the resistor R10 is respectively connected with the 2 pin of the amplifier U3A, the resistor R11 and one end of the capacitor C5, the other end of the resistor R11 is respectively connected with the 1 pin of the amplifier U3A, the resistor R12, one end of the resistor R13 and the 3 pin of the potentiometer W3, the 3 pin and the 4 pin of the amplifier U3 are connected with the ground, the output signal Vdis at the other end of the resistor R12 is connected with the Vdis in the singlechip signal processing circuit, the 2 pin regulating end of the potentiometer W3 is connected with one end of the resistor R17, the other end of the resistor R13 is respectively connected with one end of the capacitor C6 and the 6 pin of the amplifier U3B, the other end of the capacitor C6 is respectively connected with the 7 pin of the amplifier U3B and the 1 pin of the potentiometer W2, the 3 pin of the potentiometer W2 is connected with the ground, the 2 pin regulating end of the potentiometer W2 is connected with the 3 pin of the chip U1 in the power amplifying circuit, the other end of the resistor R14 is connected with the output end of the 6 pin of a chip U11 in the singlechip signal processing circuit, the other end of the resistor R17 is connected with one end of a capacitor C8, a resistor R16, a resistor R18 and a resistor R19, the other end of the resistor C8 is respectively connected with one end of a resistor R15 and the other end of a primary winding of a transformer TRF1, the other ends of the resistor R15 and the resistor R18 are connected with the ground, the other end of the resistor R19 is connected with the 3 pin of an amplifier U4A, the other end of the resistor R16 is connected with the 2 pin regulating end of a potentiometer W4, the 1 pin of the potentiometer W4 is connected with the ground, the 3 pin of the potentiometer W4 is connected with the 8 pin of the chip U1 in the power amplification circuit, the 4 pin of the amplifier U4A is connected with the ground, the 2 pin of the 2 pin regulating end of the potentiometer W5 is connected with the ground, the 3 pin of the potentiometer W5 is respectively connected with the positive electrode of a diode D4 through a resistor R20, the other end of the resistor R21, the resistor D4 is connected with the other end of the resistor D4B 4 and the other end of the resistor R4 is connected with the resistor C9, the other end of the resistor C4 is connected with the resistor U4I 4, the resistor B4 is connected with the other end of the resistor R4 is connected with the resistor C9 and the resistor I4 is connected with the other end of the resistor I9;
One end of a Relay and one end of a resistor R23 are respectively connected with +24V in the AC/DC conversion circuit, the other end of the Relay is connected with the collector electrode of a triode T1, the other end of the resistor R23 is connected with the base electrode of the triode T1, and the emitter electrode of the triode T1 is connected with the ground;
the models of the amplifier U2A, the amplifier U2B, the amplifier U3A, the amplifier U3B, the amplifier U4A and the amplifier U4B are LM358.
2. A method for implementing the amplitude and frequency adjustable high-voltage sine wave power supply circuit according to claim 1, characterized in that: when alternating current AC220V is input, the alternating current AC220V is converted into DC24V and DC + -48V through an AC/DC conversion circuit, the DC + -48V supplies power for a power amplification circuit, the DC24V is converted into DC12V through DC/DC, the power amplification circuit supplies power for an amplifier and a singlechip signal processing circuit, the output end of the power amplification circuit is connected to the primary of a transformer, the output end of the power amplification circuit is boosted through the transformer and is connected with a lightning arrester valve plate, voltage and current signals are collected from the output end of the power amplification circuit, the voltage and current signals are fed back to the singlechip signal processing circuit through a collection signal processing circuit, a set signal is compared with a feedback signal, the singlechip signal processing circuit outputs sine waves of 0-1V through a 14 pin of a chip U7, the singlechip signal processing circuit is assembled through a program and is input into a singlechip signal processing circuit chip U6 to set with required frequency, the potentiometer W5 of the collection signal processing circuit adjusts the output amplitude gain, the sine waves are input into a main circuit of the power amplification circuit through a1 pin of the power amplification circuit chip U1, and the input sine wave signals are amplified through the power amplification circuit and are output with 36 times of amplification; the method comprises the steps of collecting and processing an alternating current signal at the output end of a power amplification circuit, obtaining a negative pressure signal after full-wave rectification of an absolute value amplification circuit by an collected standard sine wave signal, outputting a DC4V voltage feedback signal Vdis after passing through a zero comparator, regulating the voltage amplitude of the Vdis by regulating a potentiometer W1, inputting the Vdis to a singlechip signal circuit, outputting a Vadj signal and the Vdis by the singlechip signal processing circuit as two comparison signals of an amplifier U3B, feeding back the comparison result to the 3 pin of the power amplification circuit chip U1 through the 7 pin of the amplifier U3B, and regulating the output state of the power amplification circuit to form a complete control loop.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811572616.0A CN109412424B (en) | 2018-12-21 | 2018-12-21 | Amplitude and frequency adjustable high-voltage sine wave power supply circuit and implementation method |
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| CN201811572616.0A CN109412424B (en) | 2018-12-21 | 2018-12-21 | Amplitude and frequency adjustable high-voltage sine wave power supply circuit and implementation method |
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| CN109412424A CN109412424A (en) | 2019-03-01 |
| CN109412424B true CN109412424B (en) | 2024-05-10 |
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| CN117134629B (en) * | 2023-10-26 | 2024-01-30 | 常州同惠电子股份有限公司 | Circuit system for outputting alternating voltage by linear alternating current power supply and working method |
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