CN211303422U - High-voltage power supply device for electric dust removal - Google Patents
High-voltage power supply device for electric dust removal Download PDFInfo
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- CN211303422U CN211303422U CN201921430703.2U CN201921430703U CN211303422U CN 211303422 U CN211303422 U CN 211303422U CN 201921430703 U CN201921430703 U CN 201921430703U CN 211303422 U CN211303422 U CN 211303422U
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Abstract
The utility model relates to a high voltage power supply unit is used in electric precipitation, high voltage power supply unit is used in electric precipitation and load connection, and high voltage power supply unit includes for the electric precipitation: the pulse power supply is used for providing instantaneous high-voltage pulse output; a high frequency power supply for providing a base DC voltage; the connecting device is respectively connected with the pulse power supply, the high-frequency power supply and the load; wherein, the connection or disconnection between any two of the pulse power supply, the high-frequency power supply and the load can be realized by operating the connecting device.
Description
Technical Field
The utility model relates to a power supply unit, in particular to high-voltage power supply unit for electric precipitation.
Background
In recent years, with the increase of the treatment of the national atmospheric pollution, the environmental emission standard of enterprises is also improved, and a plurality of industrial flue gas purification devices can not reach the new standard and face the situation of secondary modification. The main flue gas purification equipment in the current market is an electric dust remover.
The power supply unit is as the important part of high-voltage electrostatic precipitator, its performance directly influences electrostatic precipitator's dust removal effect, in order to improve dust removal effect, some new power technology are constantly being used in the electrostatic precipitator trade, fundamental wave stack excitation pulse power that appears for example in the last two years, adopt dual supply mode, use the high-power pulse technology of microsecond level, better dust removal effect has been gained, some problems have also been drawn forth to this kind of dual supply structure, because the high-pressure end of present electrostatic precipitator power is the connection high-voltage isolator, adopt single income single play mode, this kind of structure can lead to using the electrostatic precipitator of dual supply to have very big difficulty on switching power supply. In addition, a high-power IGBT module is used in the pulse power supply, an absorption circuit is required, and the conventional RCD absorption circuit is mostly adopted in the prior art, so that the loss is large and the structure is complex.
SUMMERY OF THE UTILITY MODEL
For solving the defect and not enough in the background art, the utility model provides a high-voltage power supply unit for electrostatic precipitation.
In order to achieve the above purpose, the utility model adopts the following technical scheme: the utility model provides a high voltage power supply unit for electrostatic precipitator, is connected with the load, and high voltage power supply unit for electrostatic precipitator includes: the pulse power supply is used for providing instantaneous high-voltage pulse output; a high frequency power supply for providing a base DC voltage; the connecting device is respectively connected with the pulse power supply, the high-frequency power supply and the load; wherein, the connection or disconnection between any two of the pulse power supply, the high-frequency power supply and the load can be realized by operating the connecting device.
Optionally, the three-phase alternating-current power supply supplies power to the load after passing through the pulse power supply and the high-frequency power supply, the pulse power supply comprises a first loop switch, a pulse power generator, a DSP controller, a detection circuit and a coupling circuit, and the pulse power generator is connected in parallel between the first loop switch and the coupling circuit;
the pulse power generator comprises a first rectification circuit, a first inverter circuit, an intermediate frequency transformer, a rectification filter circuit, an IGBT module and a pulse transformer which are sequentially connected in series;
the IGBT module and the first inverter circuit are connected with the DSP controller, the DSP controller is connected with the output end of the coupling circuit after being connected with the detection circuit in series,
the first loop switch is formed by connecting a circuit breaker and a contactor in series, and a three-phase alternating current power supply is supplied to the pulse power generator after passing through the first loop switch;
the coupling circuit adopts a high-voltage coupling capacitor as a coupling device,
the DSP controller includes PWM signal output and analog signal processing,
the detection circuit includes: a three-phase input voltage/input current detection circuit, an output fundamental voltage/current detection circuit, a direct current bus voltage detection circuit and an output pulse peak voltage/peak current detection circuit, wherein all detection circuits adopt an optical coupling isolation technology,
the IGBT module adopts an LC resonant soft switching technology;
the pulsed power supply employs LCD absorption technology.
Optionally, the DSP controller further includes a keyboard, a liquid crystal display unit, a storage unit, a communication interface unit, and a fault detection and protection unit.
Optionally, the high-frequency power supply includes a pre-charging circuit, a second rectifying circuit, a second inverter circuit, a high-frequency transformer, and a high-voltage rectifying circuit, which are connected in series in sequence.
Optionally, the high-frequency power supply further includes a second main circuit switch, and the three-phase ac power supply is supplied to the precharge circuit through the second main circuit switch.
Optionally, the connecting device includes a main structure box and an operation box, the operation box is disposed on a side wall of the main structure box, the main structure box is provided with two power supply inlets and a load outlet, a double-blade four-connection structure is further disposed in the main structure box, the double-blade four-connection structure includes four contacts and two blades, the four contacts are respectively a first contact connected to the pulse power supply, a second contact connected to the load, a third contact connected to the high-frequency power supply and a fourth contact grounded, the first blade is fixedly connected to the first contact, and the second blade is fixedly connected to the third contact.
Optionally, a sampling porcelain bottle is further arranged in the main structure box, and the sampling porcelain bottle is connected with a pulse power supply.
Optionally, the operation box includes a voltage sampler, a sampling plate, a first rotating hand wheel, a second rotating hand wheel and an oscilloscope, the voltage sampler is connected to the sampling porcelain bottle for receiving a sampling signal, the sampling plate is connected to the oscilloscope, the first rotating hand wheel controls the first switch blade on the first contact, and the second rotating hand wheel controls the second switch blade on the third contact.
The utility model also provides a working method of the high-voltage power supply device for electric precipitation,
when the connecting device is connected with the pulse power supply and the load, the pulse power supply independently provides voltage for the load;
when the connecting device is connected with the high-frequency power supply and the load, the high-frequency power supply independently provides voltage for the load; and
when the connecting device connects the pulse power supply, the high-frequency power supply and the load respectively, the pulse power supply and the high-frequency power supply are superposed to provide voltage for the load.
Optionally, the connecting device comprises a main structure box and an operation box, the operation box is arranged on the side wall of the main structure box, two power supply inlet ports and a load outlet port are arranged on the main structure box, a double-blade four-connection structure is further arranged in the main structure box, the double-blade four-connection structure comprises four contacts and two blades, the four contacts are respectively a first contact connected with a pulse power supply, a second contact connected with a load, a third contact connected with a high-frequency power supply and a fourth contact grounded, the first blade is fixedly connected to the first contact, the second blade is fixedly connected to the third contact,
when the two first switch blades and the second switch blade are both arranged on the fourth contact, the electric dust removing equipment is in a grounding state;
when the first knife switch is switched on the fourth contact, the second knife switch is switched on the second contact, and the pulse power supply independently provides voltage for the electric dust removal equipment;
when the second knife switch is switched on the fourth contact, the first knife switch is switched on the second contact, and the direct-current power supply independently provides voltage for the electric dust removal equipment;
when the two first knife switches and the second knife switch are both arranged on the second contact, the high-voltage pulse output by the pulse power supply is superposed on the direct-current voltage output by the direct-current power supply, and the superposed power supply is provided for a load.
Compared with the background technology, the utility model has the power type of superposing the high-voltage pulse power by the direct-current high-voltage fundamental wave, so that the high-voltage pulse power supply effectively solves the problem of absorbing medium and high specific resistance dust on the premise of ensuring low energy consumption, and meanwhile, the serious flashover can not be generated; in addition, because a form of superposing high-voltage pulse power on the direct-current high-voltage fundamental wave is adopted, the direct-current high-voltage fundamental wave can be greatly lower than the working voltage of other power supplies, the load potential is increased at the moment when the high-voltage pulse reaches, the dust is charged, and the charged dust moves to the anode plate under the load action formed by the high-voltage fundamental wave after the high-voltage pulse disappears, so that the energy consumption which is consumed in the load and does not participate in the charging of the dust is greatly reduced, the energy consumption is reduced, and the electric energy utilization rate is improved; the series resonance soft switching technology is adopted to reduce the switching loss, and the device has the functions of short-circuit protection, open-circuit protection, overvoltage and overcurrent protection, real-time input voltage adjustment to ensure stable output and the like, and has the functions of frequency modulation, amplitude modulation and width modulation, and the device has the characteristics of high dust removal efficiency, good energy consumption performance, high safety and reliability and the like.
Drawings
FIG. 1 is a schematic block diagram of a pulsed power supply according to a first embodiment;
FIG. 2 is a schematic diagram of an absorption loop of a pulsed power supply LCD according to a first embodiment;
FIG. 3 is a perspective view of the inside of the main structure box of the connecting device according to the first embodiment;
FIG. 4 is a sectional view of the inside of the main structure case of the connecting device according to the first embodiment;
FIG. 5 is a front view of an operation box of the connecting device of the first embodiment;
FIG. 6 is a side view of an operation box of the connecting device according to the first embodiment;
fig. 7 is a connection configuration diagram of the high-voltage power supply device for electric precipitation according to the first embodiment.
FIG. 8 is a functional block diagram of a pulse power supply according to the second embodiment;
FIG. 9 is one of the schematic circuit diagrams of the pulse power supply in the second embodiment;
FIG. 10 is a second schematic circuit diagram of the pulse power supply according to the second embodiment;
fig. 11 is a block diagram of a control system of the pulse power supply according to the second embodiment.
Detailed Description
Example one
Referring to fig. 1 and fig. 2, the pulse power source D1, C1, and L3 in the present embodiment form an LCD absorption loop, wherein C1 and L3 have a dc filtering function at the same time. Compared with the traditional RCD absorption circuit, the LCD absorption circuit has the advantages of small loss, simple structure, small number of components and parts and the like. The action process is as follows: when a load is in flashover, namely the load is suddenly short-circuited, a high current is suddenly generated at the high-voltage side of the TR2 pulse transformer, a high current is induced in the low-voltage coil, the current forms a loop through the resonant capacitor C2, the IGBT module S1 and the low-voltage coil of the pulse transformer, at the moment, the S1 enters the turn-off moment, a high peak is generated at two ends of Vce when the S1 is turned off, and at the moment, the absorption loop starts to act. When the voltage Vce rises and exceeds Vdc, the diode D1 is subjected to forward voltage drop and is quickly conducted, and the peak of Vce is quickly released to the filter capacitor C1, so that the effects of absorbing the peak and protecting S1 are achieved. Since the capacitance of C1 is much larger than that of C2 and C3, the absorption process does not raise the voltage of C1 too high. After the absorption action is finished, the energy absorbed by the C1 is transmitted to the load again through the pulse transformer by the action of S1, and the energy is not wasted.
Referring to fig. 3 to 7, a connection device according to an embodiment of the present disclosure includes a main structure box 1 and an operation box 2, the operation box 2 is disposed on a sidewall of the main structure box 1, the main structure box 1 is provided with two power inlets 3 and an electric field outlet 4, a dual-blade quad structure is further disposed in the main structure box 1, the dual-blade quad structure includes four contacts and two blades, the first contact is connected to a first power source, the second contact is connected to an electric field, the third contact is connected to a second power source, the fourth contact is grounded, the first blade is fixedly connected to the first contact, the second blade is fixedly connected to the third contact, a sampling porcelain bottle 5 is further disposed in the main structure box 1, and the sampling porcelain bottle 5 is connected to a high voltage input end;
the operation box 2 comprises a voltage sampler 9, a sampling plate 10, a first rotating hand wheel 11, a second rotating hand wheel 12 and an oscilloscope 13, wherein the voltage sampler 9 is connected with the sampling porcelain bottle 5 and used for receiving sampling signals, the sampling plate 10 is connected with the oscilloscope 13, the first rotating hand wheel 11 controls a first switch blade on a first contact, and the second rotating hand wheel 12 controls a second switch blade on a third contact;
and a first porcelain bottle 6 is arranged on the first contact, a second porcelain bottle 7 is arranged on the second contact, a third porcelain bottle 8 is arranged on the third contact, and the first knife switch and the second knife switch are respectively fixed at the tops of the first porcelain bottle 6 and the second porcelain bottle 7, can respectively act and are respectively connected with the second contact and the fourth contact.
The main structure case 1 adopts two to advance one and goes out and the mode of double knives quadruple, lies in that the switching power supply is convenient and can realize the function of fast switch ground connection or connecing the electric field, so the switch opens and shuts four kinds of selections altogether, is respectively:
(1) the first knife switch and the second knife switch are connected with a fourth contact: when the two first switch blades and the second switch blade are both arranged on the fourth contact, the electric dust removing equipment is in a grounding state;
(2) the first knife switch is connected with the fourth contact, the second knife switch is connected with the second contact: when the first knife switch is switched on the fourth contact, the second knife switch is switched on the second contact, and the pulse power supply independently provides voltage for the electric dust removal equipment;
(3) the first knife switch is connected with the second contact, the second knife switch is connected with the fourth contact: when the second knife switch is switched on the fourth contact, the first knife switch is switched on the second contact, and the direct-current power supply independently provides voltage for the electric dust removal equipment;
fourth, first plug-in strip, second plug-in strip all connect the second contact: when the two first knife switches and the second knife switch are both driven on the second contact, the high-voltage pulse output by the pulse power supply is superposed on the direct-current voltage output by the direct-current power supply, and the superposed power supply is provided for an electric dust removal electric field;
in conclusion, through the switching of the connecting device, the high-voltage power supply device can realize the power supply function in multiple modes and is suitable for different occasions. The pulse power supply is in an independent working mode, the output voltage is in a pure pulse mode, the instantaneous voltage and current output by the mode are large, the average voltage and the average current are small, the electric field flashover discharge is not easy to cause, and the pulse power supply is suitable for electric fields with small load capacity, low dust content and low flashover voltage. The high-frequency power supply works in a single mode: the output voltage is pure direct current high voltage, the mode has stable output voltage and output current and large output average power, and is suitable for electric fields with large load capacity, high smoke dust content and high current density requirement. Pulse power supply + high frequency power supply mode: the output voltage is direct current high voltage and high voltage pulse is superposed, the working mode is characterized in that the high voltage pulse can be superposed under the condition of maintaining the higher average value of the output voltage, so that the peak value of the output voltage is very high, the high specific resistance dust and the tiny dust can be charged and collected, the average value of the output current is also higher, the collection amount of the common dust is also higher, and the high-voltage pulse output device is suitable for a final-stage secondary-final-stage electric field of an electric dust collector, and is suitable for places with moderate dust content, small dust particle size, high specific resistance or other places difficult to charge.
The grounding or the electric field can be flexibly selected, the circuit can be switched, the type of the accessed power supply (such as a direct current power supply and a pulse power supply, and the required power supply can be selected automatically in actual use) can be selected, and the rapidness and the convenience brought by the structural innovation of the design are reflected.
Wherein the structure of double knives quadruple has used novel interlocking technique, if the plug-in strip has not hit the regulation position, under the chain protection of safety, the high pressure will unable start, at divide-shut brake in-process in addition, maintainer rotates the plug-in strip through the operation hand wheel in the switch box outside control box 2 and realizes that power selects and load switch, and above design is all for reducing the risk factor, the personal safety of guarantee maintainer.
The first rotating hand wheel 11 and the second rotating hand wheel 12 in the operation box 2 are respectively connected with the first knife switch and the second knife switch in the main structure box 1, the function is that the switch is switched on and off by manual operation, the operation box 2 integrates a high-voltage input voltage sampling function, a built-in voltage sampler 9 and a sampling plate 10 are used for converting sampling voltage and collecting voltage sampling signals, the voltage sampler 9 adopts a signal shielding technology, the built-in wire is short, the waveform of a high-voltage end can be conveniently observed by measuring the waveform of the sampling voltage, the sampling device has the characteristics of interference resistance, high precision, stable operation and the like, the specific sampling process is that a sampling porcelain bottle 5 in the main structure box 1 is connected with the high-voltage input end, the sampling porcelain bottle 5 can obtain 0-5V partial pressure in the operation box 2 after partial pressure, the low-voltage waveform on a sampling sample plate 10 in the operation box 2 can be analyzed by measuring the low-voltage waveform on the sampling plate 10, safe swift, greatly alleviateed maintainer's work load, operation box 2 still has external terminal row in addition, makes things convenient for outside wiring.
Example two
Refer to fig. 8. The embodiment provides a pulse power supply, a three-phase alternating current power supply supplies power to an electric field load of a dust remover after passing through the pulse power supply, the pulse power supply comprises a first loop switch, a pulse power generator, a high-frequency fundamental wave circuit, a DSP controller, a detection circuit and a coupling circuit, and the pulse power generator and the high-frequency fundamental wave circuit are connected in parallel between the first loop switch and the coupling circuit; the first loop switch is formed by connecting a circuit breaker and a contactor in series, and three-phase alternating current is divided into two paths to be respectively supplied to the high-frequency fundamental wave circuit and the pulse power generator after passing through the first loop switch; the pulse power generator is formed by sequentially connecting a first rectifying circuit, a first inverter circuit, an intermediate frequency transformer, a rectifying and filtering circuit, an IGBT module and a pulse transformer in series; the high-frequency fundamental wave circuit is formed by sequentially connecting a second rectifying circuit, a second inverter circuit, a high-frequency transformer and a high-voltage rectifying circuit in series; the first rectifying circuit and the second rectifying circuit are both bidirectional thyristor loops.
The pulse power supply is used for outputting high-voltage electric energy to the electric precipitation reactor and is used for charging and trapping dust in the reactor.
The input three-phase alternating current passes through a first loop switch, passes through a second rectifying circuit and is input to the input end of a primary winding of a high-frequency transformer, the secondary side of the high-frequency transformer is boosted and then passes through a high-voltage rectifying circuit consisting of 6 high-voltage silicon stacks to obtain negative direct-current high voltage, and the negative direct-current high voltage is filtered and then input to a coupling circuit part; a second rectification circuit in the high-frequency fundamental wave circuit, namely the bidirectional controllable silicon, is controlled by 6 paths of PWM signals sent by the DSP controller, and when the output voltage is too high or too low, the DSP controller adjusts the conduction angle of the bidirectional controllable silicon by changing the waveform of the PWM signals, thereby achieving the effect of adjusting the output voltage. The IGBT module, the first inverter circuit and the second inverter circuit are respectively connected with the DSP controller, and the DSP controller is connected with the output end of the coupling circuit after being connected with the detection circuit in series. The input three-phase alternating current reaches the primary side of the intermediate frequency transformer through the first loop switch and the second rectifying circuit, and generates direct-current bus voltage after being boosted by the transformer and rectified and filtered by the rectifying and filtering circuit; the voltage is boosted through the IGBT module and the pulse transformer to generate high-voltage pulse, and the high-voltage pulse is input to the coupling circuit part after being filtered.
The pulse power generator is limited by the maximum current of the IGBT module, and adopts two-stage boosting: the first stage is boosting of a power frequency transformer to obtain direct current bus voltage; the second stage is a pulse transformer for boosting voltage to obtain high-voltage pulse. The second rectification circuit in the pulse power generator, namely the bidirectional thyristor circuit, has the same control mode as the bidirectional thyristor in the high-frequency fundamental wave circuit, namely when the direct current bus voltage is too high or too low, the DSP controller adjusts the conduction angle of the bidirectional thyristor, thereby playing the role of adjusting the direct current bus voltage. A rectifying and filtering circuit of the pulse power generator comprises six high-voltage silicon stacks, and a high-voltage capacitor filters to obtain stable direct-current bus voltage so as to ensure the stability of the working environment of the IGBT. The IGBT module of the pulse power generator adopts the LC resonance type soft switching technology, so that the switching loss is effectively reduced. The circuit comprises an absorption loop, an overvoltage protection circuit, an overcurrent protection circuit and the like. The pulse power supply adopts an LCD absorption circuit, and the absorbed energy is used for pulse voltage output again, so that energy waste is avoided.
The coupling circuit adopts a high-voltage affinity capacitor as a coupling device.
The detection circuit includes: the device comprises a three-phase input voltage/input current detection circuit of a high-frequency fundamental wave circuit part, an output fundamental wave voltage/current detection circuit, a three-phase input voltage/input current detection circuit of a pulse power generator part, a direct-current bus voltage detection circuit and an output pulse peak voltage/peak current detection circuit, wherein all the detection circuits adopt an optical coupling isolation technology.
The DSP controller comprises a PWM signal output unit, an analog signal processing unit, a keyboard, a liquid crystal display unit, a storage unit, a communication interface unit and a fault detection and protection unit, so that the analog quantity of the detection circuit is acquired and processed and displayed on a liquid crystal display, and the conduction angle of the bidirectional triode thyristor is intelligently adjusted, so that the input voltage is adjusted; intelligently detecting faults and initiating protection when a fault occurs.
Please refer to fig. 9 to fig. 11. The principle of a pulse power supply is as follows: the first loop switch 1 is connected with a three-phase 380V/50HZ alternating current power supply, the first loop switch 1 is formed by connecting a circuit breaker and a contactor in series, and after the first loop switch 1 is closed, current is divided into A, B parts which flow into a high-voltage fundamental wave generator and a pulse power generator respectively. Part A: the bidirectional thyristor loop 2 is connected with the first loop switch 1 and the three-phase power frequency transformer 3, the bidirectional thyristor loop 2 adopts an integrated bidirectional thyristor structure, and the three-phase high-voltage silicon rectifier 4 is connected with the secondary of the three-phase power frequency transformer 3 and the electric dust collector 5. And part B: the bidirectional thyristor loop 6 is connected with the first loop switch 1 and the three-phase power frequency transformer 7, the three-phase high-voltage silicon rectifier 8 is connected with the three-phase power frequency transformer 7 and the pulse generation loop 9, the pulse transformer 10 is connected with the pulse generation loop 9 and the electric dust collector 5, and the electric dust collector 5 comprises a dust collector body, a filter resistor R1, a divider resistor R2 for output voltage detection, a R3 and an output current detection resistor R4. After the power supply is switched on, part A passes through a bidirectional thyristor loop 2 of which the conduction angle is controlled by a DSP controller through a circuit breaker and a contactor of a first loop switch 1, the input three-phase voltage is adjusted, then the input three-phase voltage is input into a three-phase power frequency transformer to be boosted, and the negative direct-current high-voltage fundamental wave is obtained through 6 high-voltage silicon stack bridge rectifiers; and the part B is subjected to input three-phase voltage adjustment through a bidirectional thyristor loop 6, then is subjected to boosting through a three-phase power frequency transformer 7, and then is subjected to bridge rectification through a high-voltage silicon stack 8 to obtain direct-current bus voltage, the direct-current bus voltage is subjected to pulse current generated by an IGBT pulse generation loop 9 and is input to the primary side of a pulse transformer 10, and negative high-voltage pulse is obtained after the direct-current bus voltage is boosted 10 through the pulse transformer. The high-voltage direct-current fundamental wave obtained from the path A and the negative high-voltage pulse obtained from the path B are coupled by a high-voltage capacitor to obtain a high-voltage power supply of fundamental wave superposed pulses, and the high-voltage power supply is output to the electric dust collector.
The control process of the high-voltage pulse power supply DSP controller is briefly described as follows: the controller takes TMS320F28335 as a main control unit and comprises a keyboard, a liquid crystal display unit, a storage unit, a communication interface, an analog signal processing unit, a PWM signal output unit, a fault detection and protection unit and the like. The CPU outputs a plurality of paths of PWM control signals to realize the stable output of the power supply, wherein the IGBT drives 1 path of PWM control signal, 6 paths of PWM control signals of the fundamental wave part bidirectional controllable silicon stack, 6 paths of PWM control signals of the pulse part bidirectional controllable silicon stack, 1 path of PWM control signal of the output voltage peak value detection circuit and 1 path of PWM control signal of the output current peak value detection circuit. The controller can realize the detection of three-phase input voltage, the detection of input current, the detection of pulse part direct current bus voltage, the detection of output voltage mean value, the detection of output current mean value, the detection of output voltage pulse peak value, the detection of output current pulse peak value, the detection of transformer oil temperature and the like. Detecting the obtained output voltage and current, and correspondingly adjusting a PWM signal sent to the fundamental wave bidirectional thyristor loop after AD conversion and CPU processing, thereby realizing the control of the fundamental wave of the output voltage; similarly, the detected output peak voltage, current and direct current bus voltage are subjected to AD conversion and CPU processing, and then PWM signals sent to the pulse part bidirectional thyristor loop are correspondingly adjusted, so that the direct current bus voltage is controlled, and further the output pulse amplitude is controlled.
Above only the utility model discloses an it is preferred embodiment, the utility model discloses a scope of protection not only limits in above-mentioned embodiment, and the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (8)
1. The utility model provides a high voltage power supply unit for electric precipitation, connects with the load, its characterized in that, high voltage power supply unit for electric precipitation includes:
the pulse power supply is used for providing instantaneous high-voltage pulse output;
a high frequency power supply for providing a base DC voltage;
the connecting device is respectively connected with the pulse power supply, the high-frequency power supply and the load;
wherein, the connection or disconnection between any two of the pulse power supply, the high frequency power supply and the load can be realized by operating the connecting device.
2. The high-voltage power supply device for electric precipitation according to claim 1, wherein a three-phase alternating current power supply supplies power to a load after passing through the pulse power supply and the high-frequency power supply, the pulse power supply comprises a first loop switch, a pulse power generator, a DSP controller, a detection circuit and a coupling circuit, and the pulse power generator is connected in parallel between the first loop switch and the coupling circuit;
the pulse power generator comprises a first rectifying circuit, a first inverter circuit, an intermediate frequency transformer, a rectifying and filtering circuit, an IGBT module and a pulse transformer which are sequentially connected in series;
the IGBT module and the first inverter circuit are both connected with the DSP controller, the DSP controller is connected with the output end of the coupling circuit after being connected with the detection circuit in series,
the first loop switch is formed by connecting a circuit breaker and a contactor in series, and the three-phase alternating current power supply is supplied to the pulse power generator after passing through the first loop switch;
the coupling circuit adopts a high-voltage coupling capacitor as a coupling device,
the DSP controller includes PWM signal output and analog signal processing,
the detection circuit includes: a three-phase input voltage/input current detection circuit, an output fundamental voltage/current detection circuit, a direct current bus voltage detection circuit and an output pulse peak voltage/peak current detection circuit, wherein all detection circuits adopt an optical coupling isolation technology,
the IGBT module adopts an LC resonant soft switching technology;
the pulse power supply adopts the LCD absorption technology.
3. The high-voltage power supply device for electric precipitation according to claim 2, wherein the DSP controller further comprises a keyboard, a liquid crystal display unit, a storage unit, a communication interface unit, and a fault detection and protection unit.
4. The high-voltage power supply device for electric precipitation according to claim 2, wherein the high-frequency power supply comprises a pre-charging loop, a second rectifying circuit, a second inverter circuit, a high-frequency transformer and a high-voltage rectifying circuit which are connected in series in sequence.
5. The high-voltage power supply device for electric precipitation according to claim 4, wherein the high-frequency power supply further comprises a second main circuit switch, and the three-phase alternating-current power supply is supplied to the pre-charging circuit after passing through the second main circuit switch.
6. The high-voltage power supply device for electric precipitation according to claim 1, wherein the connecting device comprises a main structure box and an operation box, the operation box is arranged on the side wall of the main structure box, the main structure box is provided with two power supply inlet ports and a load outlet port, a double-blade four-connection structure is further arranged in the main structure box, the double-blade four-connection structure comprises four contacts and two blades, the four contacts are respectively a first contact for connecting a pulse power supply, a second contact for connecting a load, a third contact for connecting a high-frequency power supply and a fourth contact for grounding, the first blade is fixedly connected to the first contact, and the second blade is fixedly connected to the third contact.
7. The high-voltage power supply device for electric precipitation according to claim 6, wherein a sampling porcelain bottle is further arranged in the main structure box, and the sampling porcelain bottle is connected with the pulse power supply.
8. The high-voltage power supply device for electric precipitation according to claim 7, wherein the operation box comprises a voltage sampler, a sampling plate, a first rotating hand wheel, a second rotating hand wheel and an oscilloscope, the voltage sampler is connected with a sampling porcelain bottle and used for receiving sampling signals, the sampling plate is connected with the oscilloscope, the first rotating hand wheel controls a first switch blade on the first contact, and the second rotating hand wheel controls a second switch blade on the third contact.
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| CN201920722373 | 2019-05-20 | ||
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110404685A (en) * | 2019-05-20 | 2019-11-05 | 浙江大维高新技术股份有限公司 | Electric precipitation high voltage power supply device and its working method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110404685A (en) * | 2019-05-20 | 2019-11-05 | 浙江大维高新技术股份有限公司 | Electric precipitation high voltage power supply device and its working method |
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