CN114157154A - BUCK amplitude-modulated high-frequency high-voltage electrostatic power supply and working method thereof - Google Patents
BUCK amplitude-modulated high-frequency high-voltage electrostatic power supply and working method thereof Download PDFInfo
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- CN114157154A CN114157154A CN202111460099.XA CN202111460099A CN114157154A CN 114157154 A CN114157154 A CN 114157154A CN 202111460099 A CN202111460099 A CN 202111460099A CN 114157154 A CN114157154 A CN 114157154A
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- 238000000034 method Methods 0.000 title claims abstract description 13
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 12
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- 238000004804 winding Methods 0.000 claims description 12
- 230000000295 complement effect Effects 0.000 claims description 6
- 239000003990 capacitor Substances 0.000 claims description 4
- 238000009499 grossing Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 238000011017 operating method Methods 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 7
- 230000001276 controlling effect Effects 0.000 description 8
- 239000012716 precipitator Substances 0.000 description 8
- 230000001105 regulatory effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 239000000428 dust Substances 0.000 description 4
- 230000005684 electric field Effects 0.000 description 4
- 239000002131 composite material Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/145—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
- H02M7/155—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
- H02M7/162—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only in a bridge configuration
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/145—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
- H02M7/155—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
- H02M7/17—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only arranged for operation in parallel
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/539—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
- H02M7/5395—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
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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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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention relates to a BUCK amplitude-modulated high-frequency high-voltage electrostatic power supply and a working method thereof. According to the invention, the BUCK amplitude modulation technology and the high-frequency power supply technology are combined, so that the power factor of the traditional silicon controlled rectifier amplitude modulation power supply is improved, the amplitude modulation range is widened, the application scene of the high-frequency power supply is further widened, and the reliability and the adaptability of the high-frequency power supply to special working conditions are improved.
Description
Technical Field
The invention belongs to the technical field of power supplies, and particularly relates to a BUCK amplitude-modulated high-frequency high-voltage electrostatic power supply and a working method thereof.
Background
The traditional high-frequency high-voltage electrostatic power supply mostly adopts a high-frequency series resonance inverter circuit, and when the special working conditions that the electric field load variation range is large and spark discharge is frequently generated are faced, the generation of load spark discharge can be avoided only by continuously reducing the working frequency, so that the power supply works at a lower frequency, deviates from a designed working point, and the impedance of a transformer is reduced, and the electric energy conversion efficiency is reduced. Usually, in order to solve this problem, designers add a thyristor to rectify and regulate voltage at the front end of the inverter, and regulate the bus voltage by adjusting the conduction angle of the thyristor, thereby regulating the secondary high voltage applied to the load, so that the inverter can operate at the designed optimal operating frequency. This voltage regulation does improve the reliability of the device, but there are some disadvantages, such as when the bus voltage is regulated to be relatively low, the thyristor works at a large angle, and the power factor at the grid side is low, which is not allowed in some places, because many grid companies do not allow the device to work at the power factor lower than 0.9 for a long time, which wastes much power supply capacity; meanwhile, due to the limitation of various technologies, the regulation precision of the voltage regulation of the controllable silicon is not very high, the range of the direct-current voltage which can be regulated is limited generally, and the space for improving the adaptability of the load is limited.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a BUCK amplitude-modulated high-frequency high-voltage electrostatic power supply and a working method thereof, which can further improve the reliability and the adaptability of the high-frequency power supply and widen the application scene of the high-frequency power supply.
According to the first aspect of the technical scheme, the BUCK amplitude-modulated high-frequency high-voltage electrostatic power supply is characterized in that after power frequency rectification filtering, BUCK chopping and high-frequency filtering are adopted, direct-current bus voltage with amplitude modulated by the BUCK chopping is output, the direct-current bus voltage is connected with a series resonance inverter circuit formed by an IGBT full bridge and a capacitor inductor, pulse current is output by controlling the resonance inverter circuit to work through pulse, meanwhile, two groups of series resonance inverter circuits work cooperatively, pulse frequency of the pulse current is improved, and the amplitude-adjustable high-frequency high-voltage electrostatic power supply is obtained.
The BUCK amplitude-modulated high-frequency high-voltage electrostatic power supply comprises a power frequency filter circuit consisting of an uncontrolled rectifying circuit DB1, an L1 and a C1, an IGBTE chopper, a high-frequency filter circuit consisting of an L2 and a C2, a first electronic switch full-bridge circuit, a second electronic switch full-bridge circuit, a first series resonance inverter circuit, a second series resonance inverter circuit and a high-voltage silicon stack rectifying circuit.
Further, the uncontrolled rectifying circuit DB1 is used for rectifying the power frequency alternating current into power frequency pulsating direct current; the power frequency filter circuit consists of L1 and C1 and is used for processing power frequency pulsating direct current rectified by DB1 into smooth direct current; the IGBTE chopper is used for chopping the smooth direct current into high-frequency pulsating direct current with controllable effective value; the high-frequency filter circuit consists of L2 and C2 and is used for smoothing the high-frequency pulsating direct current output by the IGBTE chopper to obtain smooth direct current with controllable effective value; the first electronic switch full-bridge circuit is used for inverting the direct current of the bus voltage to obtain pulsating direct current; the second electronic switch full-bridge circuit is used for inverting the direct current of the bus voltage to obtain pulsating direct current with a phase difference of 180 degrees with the first electronic switch full-bridge circuit; the first series resonance inverter circuit is used for generating resonance by being combined with the first electronic switch full-bridge circuit to obtain pulse voltage with a certain width; the second series resonance inverter circuit is used for generating resonance by being combined with the second electronic switch full-bridge circuit to obtain pulse voltage with phase difference of 180 degrees with the first series resonance inverter circuit; and the high-voltage silicon stack rectifying circuit is used for rectifying the high-voltage alternating current output by the transformer into high-voltage direct current for load use.
Preferably, one side of the uncontrolled rectifying circuit DB1 is connected to a phase end of a three-phase working condition power grid A, B, C, and the other side of the uncontrolled rectifying circuit DB1 is connected to a power frequency filter circuit formed by an L1 and a C1. And the output end of the IGBTE chopper is connected with a high-frequency filter consisting of L2 and C2.
Furthermore, the first electronic switch full-bridge circuit and the second electronic switch full-bridge circuit are in symmetrical connection structures, and the first electronic switch full-bridge circuit and the second electronic switch full-bridge circuit are similar in structure and composition; the first electronic switch full-bridge circuit is a complementary symmetrical full-bridge circuit formed by IGBTA, IGBTa, IGBTB and IGBTb, and the second electronic switch full-bridge circuit is a complementary symmetrical full-bridge circuit formed by IGBTC, IGBTc, IGBTD and IGBTd. The common collector terminal of the first electronic switch full-bridge circuit is connected with the positive electrode of the bus voltage, the common emitter terminal is connected with the negative electrode of the bus voltage, and the alternating current output terminal is connected in parallel with the primary winding at the upper ends of the C3, L3 and T1 which are connected in series.
Preferably, the common collector terminal of the second electronic switch full-bridge circuit is connected with the positive electrode of the bus voltage, the common emitter terminal is connected with the negative electrode of the bus voltage, the alternating current output terminal is connected in parallel with the primary side windings at the lower ends of C4, L4 and T1 which are connected in series, the secondary side winding at the upper end of T1 is connected in parallel with the input end of a DB2 rectifier bridge, the secondary side winding at the lower end of T1 is connected in parallel with the input end of a DB3 rectifier bridge, and the output ends of the DB2 and DB3 rectifier bridges are connected in parallel and then serve as the output of the power supply.
According to a second aspect of the technical scheme, the invention provides a working method of the BUCK amplitude-modulated high-frequency high-voltage electrostatic power supply, in the method, the output power of the BUCK circuit is adjusted by controlling the turn-on duty ratio of the IGBT, and then the output voltage of the high-frequency filter is adjusted. Furthermore, after power frequency rectification filtering, BUCK chopping and high-frequency filtering, the direct-current bus voltage with the amplitude modulated by the BUCK chopping is output, the direct-current bus voltage is connected with a series resonance inverter circuit formed by an IGBT full bridge and a capacitance inductor, the pulse current is output by controlling the resonance inverter circuit to work through pulses, and meanwhile, two groups of series resonance inverter circuits work cooperatively, so that the pulse frequency of the pulse current is improved, and the high-frequency high-voltage power supply with the adjustable amplitude is obtained.
The technical advantages and beneficial effects of the BUCK amplitude-modulated high-frequency high-voltage electrostatic power supply and the working method thereof are as follows:
1. the BUCK amplitude modulation technology is used for replacing the original silicon controlled rectifier rectification amplitude modulation technology, and the problems of large harmonic interference, low power factor, narrow amplitude modulation range and the like of the traditional silicon controlled rectifier amplitude modulation are solved.
2. According to the invention, after power frequency rectification filtering, BUCK chopping and high-frequency filtering are adopted, direct-current bus voltage with amplitude modulated by the BUCK chopping is output, the direct-current bus voltage is connected with a series resonance inverter circuit formed by an IGBT full bridge and a capacitor inductor, pulse current is output by controlling the resonance inverter circuit to work through pulse, and meanwhile, two groups of series resonance inverter circuits work cooperatively, so that the pulse frequency of the pulse current is improved, and the high-frequency high-voltage power supply with adjustable amplitude is obtained.
3. The BUCK amplitude-modulated high-frequency high-voltage electrostatic power supply regulates the output power of the BUCK circuit by controlling the turn-on duty ratio of the IGBT, and further regulates the output voltage of the high-frequency filter.
4. Because the BUCK circuit works at a higher frequency, high-precision control can be realized easily, the linearity of the controlled duty ratio and the output direct-current voltage is good, the adjustable range of the bus voltage is widened, the peak value of the output voltage and current of the dust removal power supply is reduced, the discharging possibility is reduced, and the adaptability of the high-frequency power supply to the complex working condition is further improved.
5. The BUCK amplitude modulation mode of the invention has small harmonic interference to the power grid and high power factor because the front end adopts uncontrolled rectification. Meanwhile, BUCK amplitude modulation can easily realize high-precision control, the range of the regulated direct-current voltage is wide, the linearity is good, and the adaptability of a power supply can be further improved.
Drawings
FIG. 1 is a circuit diagram of a BUCK amplitude modulated high frequency high voltage electrostatic power supply according to the present invention.
FIG. 2 is a diagram showing the installation of an electrical tar precipitator using the multiple sets of composite high-frequency high-voltage electrostatic power supplies shown in FIG. 1.
FIG. 3 is a schematic diagram of the electrical tar precipitator of FIG. 2.
Detailed Description
The invention is further elucidated with reference to the drawings and the examples of embodiment. In the following detailed description, certain exemplary embodiments of the present invention are described by way of illustration only. Needless to say, a person skilled in the art realizes that the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.
The invention provides a BUCK amplitude modulation high-frequency high-voltage electrostatic power supply and a working method thereof, which solve the problems of low silicon controlled rectifier rectification power factor, narrow amplitude modulation range and the like by combining a BUCK amplitude modulation technology and a high-frequency power supply technology, further improve the adaptability of the high-frequency power supply to complex working conditions and widen the application scene of the high-frequency power supply.
The invention relates to a BUCK amplitude-modulated high-frequency high-voltage electrostatic power supply and a working method thereof.
The invention will be further explained with reference to the accompanying drawings, and the BUCK amplitude-modulated high-frequency high-voltage electrostatic power supply shown in fig. 1 comprises a power frequency filter circuit composed of an uncontrolled rectifier circuit DB1, an L1 and a C1, an IGBTE chopper, a high-frequency filter circuit composed of an L2 and a C2, a first electronic switch full-bridge circuit, a second electronic switch full-bridge circuit, a first series resonance inverter circuit, a second series resonance inverter circuit and a high-voltage silicon stack rectifier circuit, wherein:
and the uncontrolled rectifying circuit DB1 is used for rectifying the power frequency alternating current into power frequency pulsating direct current.
And the power frequency filter circuit consists of L1 and C1 and is used for processing the power frequency pulsating direct current rectified by DB1 into smooth direct current.
And the IGBTE chopper is used for chopping the smooth direct current into high-frequency pulsating direct current with controllable effective value.
And the high-frequency filter circuit consists of L2 and C2 and is used for smoothing the high-frequency pulsating direct current output by the IGBTE chopper to obtain a smooth direct current with a controllable effective value.
The first electronic switch full-bridge circuit is used for inverting the direct current of the bus voltage to obtain pulsating direct current.
And the second electronic switch full-bridge circuit is used for inverting the direct current of the bus voltage to obtain pulsating direct current with a phase difference of 180 degrees with the first electronic switch full-bridge circuit.
And the first series resonance inverter circuit is used for generating resonance by combining with the first electronic switch full-bridge circuit to obtain pulse voltage with a certain width.
And the second series resonance inverter circuit is used for generating resonance by being combined with the second electronic switch full-bridge circuit to obtain pulse voltage with the phase difference of 180 degrees with the first series resonance inverter circuit.
And the high-voltage silicon stack rectifying circuit is used for rectifying the high-voltage alternating current output by the transformer into high-voltage direct current for load use.
One side of the uncontrolled rectifying circuit DB1 is connected with the input end of a power grid, preferably connected to the phase line end of a three-phase working condition power grid A, B, C, and the working voltage of the uncontrolled rectifying circuit DB1 is 380V. The other side of the uncontrolled rectifying circuit DB1 is connected with a power frequency filter circuit formed by L1 and C1, specifically, L1 in the power frequency filter circuit formed by L1 and C1 is connected with the output end of the uncontrolled rectifying circuit DB1, a signal output from the uncontrolled rectifying circuit DB1 is transmitted to the IGBTE chopper through the inductor L1 and the middle end of the capacitor C1 after passing through the inductor L1, namely, the IGBTE chopper is connected at the rear stage of the power frequency filter circuit, the output end connected with the IGBTE chopper is connected with a diode D1, and the diode D1 is reversely connected between the output end and the ground end of the IGBTE chopper in series; and the output end of the IGBTE chopper is connected with a high-frequency filter consisting of L2 and C2.
The high-frequency filter composed of L2 and C2 is used for carrying out high-frequency filtering on an output signal of the IGBTE chopper and then transmitting the output signal to the first electronic switch full-bridge circuit and the second electronic switch full-bridge circuit, the first electronic switch full-bridge circuit and the second electronic switch full-bridge circuit are in symmetrical connection structures, and the first electronic switch full-bridge circuit and the second electronic switch full-bridge circuit are similar in structure and composition; the first electronic switch full-bridge circuit is a complementary symmetrical full-bridge circuit formed by IGBTA, IGBTa, IGBTB and IGBTb, and the second electronic switch full-bridge circuit is a complementary symmetrical full-bridge circuit formed by IGBTC, IGBTc, IGBTD and IGBTd.
The common collector terminal of the first electronic switch full-bridge circuit is connected with the positive electrode of the bus voltage, the common emitter terminal is connected with the negative electrode of the bus voltage, and the alternating current output terminal is connected in parallel with the primary winding at the upper ends of the C3, L3 and T1 which are connected in series.
The common collector terminal of the second electronic switch full-bridge circuit is connected with the positive electrode of the bus voltage, the common emitter terminal is connected with the negative electrode of the bus voltage, the alternating current output terminal is connected with the primary side windings at the lower ends of C4, L4 and T1 which are connected in series in parallel, the secondary side winding at the upper end of T1 is connected with the input end of a DB2 rectifier bridge in parallel, the secondary side winding at the lower end of T1 is connected with the input end of a DB3 rectifier bridge in parallel, and the output ends of the DB2 and DB3 rectifier bridges are connected in parallel and then used as the output of a power supply.
Further, the working method of the BUCK amplitude-modulated high-frequency high-voltage electrostatic power supply is provided, the BUCK amplitude-modulated high-frequency high-voltage electrostatic power supply adjusts the output power of the BUCK circuit by controlling the turn-on duty ratio of the IGBT, and further adjusts the output voltage of the high-frequency filter. Furthermore, after power frequency rectification filtering, BUCK chopping and high-frequency filtering, the direct-current bus voltage with the amplitude modulated by the BUCK chopping is output, the direct-current bus voltage is connected with a series resonance inverter circuit formed by an IGBT full bridge and a capacitance inductor, the pulse current is output by controlling the resonance inverter circuit to work through pulses, and meanwhile, two groups of series resonance inverter circuits work cooperatively, so that the pulse frequency of the pulse current is improved, and the high-frequency high-voltage power supply with the adjustable amplitude is obtained.
The working process is as follows:
step S1: after the working condition voltage is rectified by the uncontrolled rectifier circuit DB1, the output pulsating voltage passes through a power frequency filter circuit consisting of L1 and C1, and then smooth direct current voltage of about 510V is output;
step S2: the smooth direct current voltage of about 510V provides reliable energy for a post-stage IGBTE chopper (BUCK chopper circuit).
Step S3: the IGBTE of the IGBTE chopper (BUCK chopper circuit) works at a frequency of preferably 10K, the voltage at the rear end of the IGBTE is adjusted by adjusting the duty ratio of pulses of the IGBTE chopper, and the voltage at the rear end of the IGBTE is output to a high-frequency filter consisting of L2 and C2;
step S4: the high-frequency filter composed of L2 and C2 filters the high-frequency ripple voltage regulated by IGBTE into smooth direct-current voltage to obtain a target bus voltage value.
Step S5: the first electronic switch full-bridge circuit is used for inverting the direct current of the bus voltage to obtain pulsating direct current; the second electronic switch full-bridge circuit is also used for inverting the direct current of the bus voltage to obtain pulsating direct current with a phase difference of 180 degrees with the first electronic switch full-bridge circuit;
step S6: the first series resonance inverter circuit is used for generating resonance by combining with the first electronic switch full-bridge circuit to obtain pulse voltage with a certain width; the second series resonance inverter circuit is used for generating resonance by being combined with the second electronic switch full-bridge circuit to obtain pulse voltage with phase difference of 180 degrees with the first series resonance inverter circuit;
step S7: the high-voltage silicon stack rectifying circuit is used for rectifying high-voltage alternating current output by the transformer into high-voltage direct current for load use.
FIG. 2 is a diagram showing the installation of an electrical tar precipitator using the multiple sets of composite high-frequency high-voltage electrostatic power supplies shown in FIG. 1. FIG. 3 is a schematic diagram of the electrical tar precipitator of FIG. 2.
As shown in fig. 2 and 3, the high voltage power supply 23 is applied to the electrical tar precipitator, and specifically controls the input power supply to output high voltage direct current through the high voltage power supply 32 and to the cathode system in the electrical tar precipitator 33 through the indoor-arranged control cabinet 31. Under the action of the electric field force, the gas passing through the electric field completes the separation of positive and negative substances, and realizes the trapping of tar. The electrical tar precipitator 33 shown in fig. 3 and 2 comprises a straight cylindrical barrel 41, in which a honeycomb anode system 43 is arranged; a set of wires fixed by a frame is used as a cathode system 44, the high voltage power supply 32 is arranged on top of the apparatus, and the layers of the apparatus are equipped with platform ladders 46 to ensure the safety of the operator. In addition, auxiliary equipment such as instruments, control power supply and power transmission and the like are arranged. The upper hanger, the lower hanger and the adjusting device are used for ensuring that each corona polar line is positioned at the center of each electric field space. In order to prevent the surface of the insulator from dewing, an electric heating protection is arranged in the insulating box. The top of the electric tar precipitator is provided with a flushing system 45 which is used for periodically removing tar and dust adhered to the anode and the cathode. The gas-equalizing flow guide device 42 is one of the main factors influencing the dust removal efficiency of the equipment, so that the uniformity of the flow field in the equipment needs to achieve the designed effect, and the conditions of greatly reduced tar collecting efficiency, increased running resistance of the equipment and the like caused by uneven distribution of a velocity field and a pressure field are avoided; in order to ensure that the trapped tar has enough fluidity, the bottom of the device is provided with a steam heating pipe 40, so that the tar is effectively promoted to be discharged.
According to the BUCK amplitude-modulated high-frequency high-voltage electrostatic power supply, the output power of the BUCK circuit is adjusted by controlling the turn-on duty ratio of the IGBT, so that the output voltage of the high-frequency filter is adjusted, and the BUCK circuit works under direct-current voltage, so that harmonic interference on a power grid is small, and the power factor is high. Meanwhile, the BUCK circuit works at a high frequency, so that high-precision control can be easily realized, the linearity of the controlled duty ratio and the output direct-current voltage is good, the adjustable range of the bus voltage is widened, the peak value of the output voltage and current of the dust removal power supply is reduced, the discharging possibility is reduced, and the adaptability of the high-frequency power supply to the complex working condition is further improved.
Another innovation of the invention is that: the front end of the BUCK amplitude modulation mode adopts uncontrolled rectification, harmonic interference to a power grid is small, and the power factor is high. Meanwhile, BUCK amplitude modulation can easily realize high-precision control, the range of the regulated direct-current voltage is wide, the linearity is good, and the adaptability of a power supply can be further improved.
Compared with the prior art, the BUCK amplitude-modulated high-frequency high-voltage electrostatic power supply has the advantages that the amplitude is adjustable, the power factor is improved, the amplitude-modulated range is widened, and the adaptability of the power supply is further improved.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (10)
1. A BUCK amplitude-modulated high-frequency high-voltage electrostatic power supply is characterized in that after power frequency rectification filtering, BUCK chopping and high-frequency filtering are adopted, direct-current bus voltage with amplitude modulated by the BUCK chopping is output, a series resonance inverter circuit formed by an IGBT full bridge and a capacitance inductor outputs pulse current by controlling the resonance inverter circuit to work, and meanwhile, two groups of series resonance inverter circuits work cooperatively to improve pulse frequency of the pulse current and obtain the amplitude-adjustable high-frequency high-voltage power supply.
2. The BUCK amplitude-modulated high-frequency high-voltage electrostatic power supply as claimed in claim 1, which comprises an uncontrolled rectifier circuit DB1, a power frequency filter circuit composed of L1 and C1, an IGBTE chopper, a high-frequency filter circuit composed of L2 and C2, a first electronic switch full bridge circuit, a second electronic switch full bridge circuit, a first series resonance inverter circuit, a second series resonance inverter circuit and a high-voltage silicon stack rectifier circuit.
3. The BUCK amplitude-modulated high-frequency high-voltage electrostatic power supply as claimed in claim 2, wherein the uncontrolled rectifying circuit DB1 is used for rectifying power frequency alternating current into power frequency pulsating direct current;
the power frequency filter circuit consists of L1 and C1 and is used for processing power frequency pulsating direct current rectified by DB1 into smooth direct current;
the IGBTE chopper is used for chopping the smooth direct current into high-frequency pulsating direct current with controllable effective value;
the high-frequency filter circuit consists of L2 and C2 and is used for smoothing the high-frequency pulsating direct current output by the IGBTE chopper to obtain smooth direct current with controllable effective value;
the first electronic switch full-bridge circuit is used for inverting the direct current of the bus voltage to obtain pulsating direct current;
the second electronic switch full-bridge circuit is used for inverting the direct current of the bus voltage to obtain pulsating direct current with a phase difference of 180 degrees with the first electronic switch full-bridge circuit;
the first series resonance inverter circuit is used for generating resonance by being combined with the first electronic switch full-bridge circuit to obtain pulse voltage with a certain width;
the second series resonance inverter circuit is used for generating resonance by being combined with the second electronic switch full-bridge circuit to obtain pulse voltage with phase difference of 180 degrees with the first series resonance inverter circuit;
and the high-voltage silicon stack rectifying circuit is used for rectifying the high-voltage alternating current output by the transformer into high-voltage direct current for load use.
4. The BUCK amplitude-modulated high-frequency high-voltage electrostatic power supply as claimed in claim 3, wherein one side of the uncontrolled rectifying circuit DB1 is connected to a phase terminal of a three-phase working condition power grid A, B, C, and the other side of the uncontrolled rectifying circuit DB1 is connected to a power frequency filter circuit formed by an L1 and a C1.
5. The BUCK amplitude modulated high frequency high voltage electrostatic power supply as claimed in claim 3, wherein the IGBTE chopper output is connected to a high frequency filter consisting of L2, C2.
6. The BUCK amplitude-modulated high-frequency high-voltage electrostatic power supply as claimed in claim 3, wherein the first electronic switch full-bridge circuit and the second electronic switch full-bridge circuit are in a symmetrical connection structure, and the first electronic switch full-bridge circuit and the second electronic switch full-bridge circuit are similar in structure and composition; the first electronic switch full-bridge circuit is a complementary symmetrical full-bridge circuit formed by IGBTA, IGBTa, IGBTB and IGBTb, and the second electronic switch full-bridge circuit is a complementary symmetrical full-bridge circuit formed by IGBTC, IGBTc, IGBTD and IGBTd.
7. The BUCK amplitude-modulated high-frequency high-voltage electrostatic power supply as claimed in claim 6, wherein the common collector terminal of the first electronic switch full-bridge circuit is connected with the positive terminal of the bus voltage, the common emitter terminal is connected with the negative terminal of the bus voltage, and the AC output terminal is connected in parallel with the primary side winding at the upper ends of the serially connected C3, L3 and T1.
8. The BUCK amplitude-modulated high-frequency high-voltage electrostatic power supply as claimed in claim 6, wherein the common collector terminal of the second electronic switch full-bridge circuit is connected with the positive terminal of the bus voltage, the common emitter terminal is connected with the negative terminal of the bus voltage, the AC output terminal is connected in parallel with the primary side windings at the lower ends of C4, L4 and T1 which are connected in series, the secondary side winding at the upper end of T1 is connected in parallel with the input end of the DB2 rectifier bridge, the secondary side winding at the lower end of T1 is connected in parallel with the input end of the DB3 rectifier bridge, and the output ends of the DB2 and DB3 rectifier bridges are connected in parallel to serve as the output of the power supply.
9. A method for operating a BUCK amplitude modulated high frequency high voltage electrostatic supply as claimed in any one of claims 1 to 8, characterized in that the BUCK amplitude modulated high frequency high voltage electrostatic supply regulates the output power of the BUCK circuit by controlling the on duty cycle of the IGBT and thus the output voltage of the high frequency filter.
10. The operating method of the BUCK amplitude-modulated high-frequency high-voltage electrostatic power supply according to claim 9, wherein the dc bus voltage whose amplitude is modulated by BUCK chopping is output after the power frequency rectifying and filtering, the BUCK chopping and the high-frequency filtering, and then the series resonant inverter circuit formed by the IGBT full bridge and the capacitor inductor is connected, the pulse current is output by controlling the operation of the resonant inverter circuit through pulses, and simultaneously the two sets of series resonant inverter circuits work cooperatively, so that the pulse frequency of the pulse current is increased, and the high-frequency high-voltage power supply with adjustable amplitude is obtained.
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