CN108927288A - A kind of high-pressure dust-cleaning power supply - Google Patents
A kind of high-pressure dust-cleaning power supply Download PDFInfo
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- CN108927288A CN108927288A CN201810610333.4A CN201810610333A CN108927288A CN 108927288 A CN108927288 A CN 108927288A CN 201810610333 A CN201810610333 A CN 201810610333A CN 108927288 A CN108927288 A CN 108927288A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
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- B03C3/66—Applications of electricity supply techniques
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Abstract
The invention discloses a kind of high-pressure dust-cleaning power supplys, including current rectifying and wave filtering circuit, circuit for power conversion, control module, switching tube drive module, auxiliary power circuit and spark flashover detection circuit；Current rectifying and wave filtering circuit is mainly to the improve and perfect of module rectification principle, improved module is enabled to efficiently accomplish rectified action and EMI filtering, stable voltage support is provided for the power conversion circuit and accessory power supply of rear class, switching tube drive module improves the driving capability of PWM wave in control module using isolating transformer, the PWM waveform for generating control module SG3525 directly controls the working condition of switching tube, control module carries out automation control to high voltage power supply by the detection signal of spark flashover detection circuit, the output voltage of power supply is reduced when finding that sparking phenomenon occurs for electric precipitator.Of the invention easy to use and energy automation control, it is environmentally protective.
Description
Technical field
The invention belongs to technical field of environment protection equipment, a kind of particularly height using novel spark flashover detection technique
Piezoelectricity dedusting power source.
Background technique
In the production activity of the mankind, with production-scale expansion, environmental pollution such as water pollution, air pollution, waste
Pollution, chemical contamination, noise pollution, thermal pollution etc. are on the rise, and dust is one of major pollutants in air pollutants.It is existing
Nowadays environmentally friendly topic has been introduced into public focus, and environmental protection has become the discussion hot spot of all trades and professions, in air treating
Field, country have also put into effect a series of policies, have promoted the all-round construction and development of environmental protection industry.High-pressure dust-cleaning power supply possesses dedusting
High-efficient, cleaning capacity is strong and the features such as will not causing secondary pollution to environment, therefore has uniqueness in terms of air cleaning
Advantage.
High voltage power supply is part most crucial in entire electric dust removal system, due to the feelings of electric precipitator work high voltage again
Under condition, disruptive discharge that gas or liquid medium occur along insulating surface.In order to make electrostatic precipitator work optimal
Operating condition makes efficiency of dust collection maintain optimum value, is necessarily required to that spark flashover is detected and controlled.
The electric precipitator of most operations is all to be run manually by operations staff according to unit operating condition at present.
The drawbacks of this manual method of operation is it will be apparent that if the control of electric precipitator working voltage is too low, it is possible to be led
Cause smoke emissioning concentration that discharge standard is not achieved.Secondly, most of electric dust-removing power supply control chip operation power supply is directly to pass through
Alternating current decompression is got, and the loss of power supply is increased, to reduce the efficiency of power supply entirety.
Therefore, for drawbacks described above present in currently available technology, it is really necessary to be studied, to provide a kind of side
Case solves defect existing in the prior art.
Summary of the invention
The present invention provides a kind of high-pressure dust-cleaning electricity with spark flashover detection circuit in view of the deficiencies in the prior art
Source is controlled to the output operating condition preferably to electric precipitator.
To achieve the above object, technical scheme is as follows：
A kind of high-pressure dust-cleaning power supply, including current rectifying and wave filtering circuit, circuit for power conversion, control module, switching tube drive mould
Block, auxiliary power circuit and spark flashover detection circuit, wherein the current rectifying and wave filtering circuit is connected with input is exchanged, and is used for
Rectification and EMI filtering are carried out to exchange input；The auxiliary power circuit is connected with current rectifying and wave filtering circuit, for exporting direct current
Voltage provides power supply for the control module and switching tube drive module；The power conversion circuit is connected with current rectifying and wave filtering circuit
It connects, for exporting high drive electrostatic precipitator；The spark flashover detection circuit is connected with High voltage output, for capturing height
Pressure dedusting power source spark flashover and sends spark flashover signal to the control module when exporting electric current；The control module
It is connect with switching tube drive module, for exporting control signal according to spark flashover signal to adjust the switching tube drive module
The driving signal of output；The switching tube drive module is connected with circuit for power conversion, for output drive signal to adjust
The high pressure of the circuit for power conversion output；
The current rectifying and wave filtering circuit includes fuse F1, resistance R1~R3, capacitor C1~C5, common mode inductance L1, rectification
Bridge D1；One end of fuse F1 is connect with input alternating current one end, the other end of fuse and one end, the first electricity of first resistor R1
Hold the 1st pin connection of one end of C1, one end of second resistance R2, common mode inductance L1, the other end and alternating current of first resistor R1
The 3rd pin connection of the other end of input, the electric other end of a capacitor C1, the other end of second resistance R2, common mode inductance L1, altogether
The 2nd pin of mould inductance L1 is connect with one end of the second capacitor C2, one end of the 4th capacitor C4, the 2nd pin of rectifier bridge D1, the
The other end of two capacitor C2 and one end connect and ground of third capacitor C3, the other end of third capacitor C3 is with common mode inductance L1's
The 4th pin connection of 4th pin, the other end of the 4th capacitor C4, rectifier bridge D1, the 3rd pin and 3rd resistor of rectifier bridge D1
The anode connection of one end of R3, the 5th capacitor C5, the 1st pin of rectifier bridge D1 and the other end, the 5th capacitor C5 of 3rd resistor R3
Cathode connect and ground end；The first resistor R1 is that varistor type selecting is 20D471K, and first capacitor C1 is X capacitor, the
Two capacitor C2 and third capacitor C3 are Y capacitance, and the 5th capacitor C5 is electrolytic capacitor；
The control module includes control chip U1, diode D2, capacitor C6~C10, resistance R4~R10；Control core
The 1st pin of piece U1 is connect with one end of one end of the 8th capacitor C8, the 6th resistance R6, and the one of the 2nd pin and the 5th resistance R5
One end connection at end, the 9th resistance R9, the 3rd pin floating, the 4th pin floating, one end of the 5th pin and the 6th capacitor C6, the
One end of four resistance R4 connects, and the 6th pin is connect with one end of the tenth resistance R10, the other end of the 7th pin and the 4th resistance R4
Connection, the 8th pin are connect with the anode of the 7th capacitor C7, and one end of the 9th pin and the tenth capacitor C11, the 8th capacitor C8's is another
One end connection of one end, the 9th capacitor C9, the 10th pin are connect with one end of the cathode of the second diode D2, the 9th resistance R9,
11st pin is connect with power source internal drive module, after the 12nd pin is connect with the other end of the 9th resistance R9 and is grounded, the 13rd
Pin is connect with one end of the 8th resistance R8, the drive module connection of the 14th pin and power source internal, the 15th pin and the 8th electricity
The other end connection of resistance R8 is followed by power supply VCC, and the 16th pin is connect with the other end of the 7th resistance R7；5th resistance R5's is another
End ground connection, the other end and the other end of the tenth resistance R10 of the 6th capacitor C6, the cathode of the 7th capacitor C7, the tenth capacitor C10
The other end connect and ground of the other end, the 9th resistance R9, the other end of the 6th resistance R6 and the other end of the 9th capacitor C9 connect
It connects, the other end of the tenth capacitor C10 connects power supply VCC, receiving end Fire_ of the anode of the second diode D2 as detection signal
Flag is connected with spark flashover detection circuit；The diode D2 is Schottky diode, and the 7th capacitor C7 is electrolytic capacitor,
Tenth resistance R10 is to adjust swept resistance, controls the model SG3525 of chip U1；
The switching tube drive module includes isolating transformer T1, diode D3~D8, triode Q1~Q4, metal-oxide-semiconductor
Q5~Q6, resistance R13~R17, capacitor C11；Base stage, the eleventh resistor of the base stage of first triode Q1 and the second triode Q2
One end of R11 connects, and the other end of eleventh resistor R11 is connect with 11 pins of control chip U1, the collection of the first triode Q1
Electrode is connect with ground terminal, and the collector of the second triode Q2 is connect with 15V voltage, the emitter and the two or three of the first triode Q1
The 1st pin connection of the emitter of pole pipe Q2, one end of thirteenth resistor R13, isolating transformer T1, thirteenth resistor R13's
The other end is connect with one end of the 11st capacitor C11, the base stage of the base stage of third transistor Q3 and the 4th triode Q4, the 12nd
One end of resistance R12 connects, and the other end of twelfth resistor R12 is connect with 12 pins of control chip U1, the 4th triode Q4
Collector connect with ground terminal, the collector of third transistor Q3 is connect with 15V voltage, the emitter of third transistor Q3 and
The 3rd pin connection of the emitter of four triode Q4, one end of the 11st capacitor C11, isolating transformer T1, isolating transformer T1
The 2nd pin connect with one end of the cathode of third diode D3, the 14th resistance R14, the 5th pin of isolating transformer T1 with
The drain electrode of the anode of 6th diode D6, one end of the 16th resistance R16, the source electrode of the first metal-oxide-semiconductor Q5, the second metal-oxide-semiconductor Q6 connects
It connects, the 6th pin of isolating transformer T1 is connect with one end of the cathode of the 4th diode D4, the 15th resistance R15, and transformation is isolated
The 4th pin of device T1 is connect simultaneously with the source electrode of the anode of the 8th diode D8, one end of the 17th resistance R17, the second metal-oxide-semiconductor Q5
Ground terminal, anode and the other end of the 14th resistance R14, the anode of the 5th diode D5, the 16th electricity of third diode D3
The grid connection of the other end, the first metal-oxide-semiconductor Q5 of R16 is hindered, the cathode of the 5th diode D5 and the cathode of the 6th diode D6 connect
It connects, anode, the 17th resistance R17 of the other end of the anode of the 4th diode D4 and the 15th resistance R15, the 7th diode D7
The other end, the second metal-oxide-semiconductor Q6 grid connection, the cathode of the 7th diode D7 connect with the cathode of the 8th diode D8, the
The drain electrode of one metal-oxide-semiconductor Q5 and the 310V busbar voltage of current rectifying and wave filtering circuit connect；The isolating transformer T1 uses EE22 magnetic core,
Armature winding and two secondary windings are respectively around 30 circles, no-load voltage ratio 1：1：1, triode Q1, Q3 be NPN type triode, triode Q2,
Q4 is PNP type triode, and diode D3, D4 model RS1M, diode D5~D8 are that pressure stabilizing is organ, metal-oxide-semiconductor Q5, Q6 model
For IRFP460；
The spark flashover detection circuit includes logic chip U2, diode D9~D12, resistance R18~R23, capacitor
C11~C12, NPN type triode Q7~Q8, spark inductive sensor L2；The 1st pin and the 2nd pin, the 20th of logic chip U2
One end connection of one end, the 12nd capacitor C12 of one resistance R21, the 3rd pin are connect with the 4th pin, the 5th pin and the 1st pin
Connection, the 6th pin are connect with the other end of the 9th pin, the 10th pin, the 12nd capacitor C12, the 7th pin ground connection, the 8th pin
The output end Fire_flag of the detection circuit, the 10th pin, the 12nd capacitor C12 are connected to the base stage of NPN diode Q8
Other end connection, the 12nd pin and the 13rd pin, one section of the second inductance L2, one section of the 18th resistance R18, the 9th 2 pole
The anode of pipe D9, the both ends of the 11st capacitor C11, the 20th resistance R20 both ends, the both ends of the 11st diode D11, NPN
The emitter connect and ground of type triode Q7, the 14th pin connect 5V power supply；The other end and the 18th resistance of second inductance L2
One end connection of the other end of R18, the 19th resistance R19, the other end of the 19th resistance R19 and the yin of the 9th diode D9
The base stage connection of pole, the anode of the tenth diode D10, NPN triode Q7, the cathode and NPN triode Q7 of the tenth diode D10
Collector connect and connect 5V power supply, the other end ground connection of the 21st resistance R21, the collector of NPN triode Q8 and second
The anode connection of one end, the 12nd diode D12 of 13 resistance R23, the emitter of NPN triode Q8 and the 12nd diode
The cathode connect and ground of D12, the other end of the 23rd resistance R23 are connect with 5V power supply；The logic chip U2 model
It is LED diode for SN74HC00, the 12nd diode D12, the second inductance is Spark plug optical fiber sensor inductance；The 5V power supply is by height
The accessory power supply of voltage source provides.
The device have the advantages that：
High-pressure dust-cleaning power supply of the invention can carry out automation tune to power supply output according to the output operating condition of electric precipitator
Section, does not need user and manually controls in real time.Power-supply system can accurately in real time carry out the working condition of electric precipitator
It monitors and controls, improves the whole efficiency of dust collection of electric precipitator, it is easy to operate, safe, with certain practical value.Simultaneously
Again the control chip circuit of high voltage power supply is designed, reduces the loss of power supply, improve the power of power supply entirety
Transfer efficiency.
Detailed description of the invention
Fig. 1 is the system block diagram of high-pressure dust-cleaning power supply of the present invention；
Fig. 2 is the circuit diagram of current rectifying and wave filtering circuit in the present invention；
Fig. 3 is the circuit diagram of control module in the present invention；
Fig. 4 is the circuit diagram of switching tube drive module in the present invention；
Fig. 5 is the circuit diagram of spark flashover detection circuit in the present invention.
Following specific embodiment will further illustrate the present invention in conjunction with above-mentioned attached drawing.
Specific embodiment
Technical solution provided by the invention is described further below with reference to attached drawing.
Referring to Fig. 1, it show the system block diagram of high-pressure dust-cleaning power supply of the present invention, including the conversion of current rectifying and wave filtering circuit, power
Circuit, control module, switching tube drive module, auxiliary power circuit and spark flashover detection circuit, wherein the rectifying and wave-filtering
Circuit is connected with input is exchanged, for carrying out rectification and EMI filtering to exchange input；The auxiliary power circuit and rectification are filtered
Wave circuit is connected, and provides power supply for exporting DC voltage for the control module and switching tube drive module；The power
Conversion circuit is connected with current rectifying and wave filtering circuit, for exporting high drive electrostatic precipitator；The spark flashover detection circuit
Being connected with High voltage output, spark flashover and sending spark flashover signal when for capturing high-pressure dust-cleaning electric power outputting current
To the control module；The control module is connect with switching tube drive module, is controlled for being exported according to spark flashover signal
Signal is to adjust the driving signal that the switching tube drive module exports；The switching tube drive module and circuit for power conversion phase
Connection adjusts the high pressure of the circuit for power conversion output for output drive signal.
Wherein, auxiliary power circuit is mainly that control module, switching tube drive module and its relevant control chip provide
Stable supply voltage uses the common accessory power supply of the prior art in current rectifying and wave filtering circuit in a preferred embodiment
Implementation design an isolated form DC-DC power source, due to flyback switching topology be suitable for small-power output operating condition and
Work efficiency is high, circuit structure is relatively simple, is suitable as the main circuit of accessory power supply.The auxiliary electricity of entire high-pressure dust-cleaning power supply
Source current is divided into two-way output：Major loop output voltage is 12V, and output power 9W provides for control module and drive module
DC voltage；Subloop output voltage is 5V, output power 3W, and control chip provides voltage.
In a preferred embodiment, circuit for power conversion uses the common complex resonance code converter of the prior art, from
And achieve the purpose that the high voltage output of rear class.
Such as Fig. 2, it show the circuit diagram of current rectifying and wave filtering circuit, including fuse F1, resistance R1~R3, capacitor C1~
C5, common mode inductance L1, rectifier bridge D1；One end of fuse F1 is connect with input alternating current one end, the other end of fuse and first
The 1st pin connection of one end of resistance R1, one end of first capacitor C1, one end of second resistance R2, common mode inductance L1, the first electricity
Hinder the other end, the common mode inductance of the other end of R1 and the other end of alternating current input, the other end of one capacitor C1 of electricity, second resistance R2
The 3rd pin of L1 connects, the 2nd pin of common mode inductance L1 and one end, one end of the 4th capacitor C4, rectifier bridge of the second capacitor C2
The 2nd pin of D1 connects, and the other end of the second capacitor C2 and one end connect and ground of third capacitor C3, third capacitor C3's is another
One end is connect with the 4th pin of the 4th pin of common mode inductance L1, the other end of the 4th capacitor C4, rectifier bridge D1, rectifier bridge D1's
3rd pin is connect with the anode of one end of 3rd resistor R3, the 5th capacitor C5, and the 1st pin of rectifier bridge D1 is with 3rd resistor R3's
The cathode connect and ground end of the other end, the 5th capacitor C5；It is 20D471K that the first resistor R1, which is varistor type selecting, the
One capacitor C1 is X capacitor, and the second capacitor C2 and third capacitor C3 are Y capacitance, and the 5th capacitor C5 is electrolytic capacitor.
Current rectifying and wave filtering circuit carries out rectifying and wave-filtering to the electric main of input, as the first part of high-pressure dust-cleaning power supply,
The superiority and inferiority of circuit design directly affects the output operating condition and performance indexes of power supply.Switching Power Supply is primarily present Conduction Interference
It is interfered with near-field thermal radiation, and di/dt and du/dt that these interference sources are mainly generated by power switch tube switch motion cause, together
When due in rectification circuit input current be it is interrupted, not only cause substantially reducing for input power factor, but also increase big
The higher hamonic wave of amount, the part so electromagnetic interface filter is very important in Switching Power Supply.Electromagnetic interface filter has to differential mode and is total to
Mode noise signal has apparent inhibiting effect, so differential mode filter and common-mode filter can generally be added.
Improve and perfect of the design of Fig. 2 mainly to module rectification principle, enables improved module effectively complete
It is filtered at rectified action and EMI, provides stable voltage support for the power dress mold changing block and accessory power supply of rear class.Rectification filter
It include the devices such as varistor, rectifier bridge, filter capacitor and electromagnetic interface filter in wave circuit, wherein R1 is model 20D-
The varistor of 471K.Varistor is that a kind of C-V characteristic is nonlinear resistance, when the similar emergency case such as lightning stroke occurs
When, filter module utilizes its nonlinear characteristic by unexpected raised voltage clamping to a relatively-stationary value, thus to rear
The module of grade plays a protective role.Common mode inductance L1 is that isolating transformer can be effectively isolated the dry of input and successive load
It disturbs.C4, C1 are safety X-type capacitor, and C2, C3 are safety Y type capacitor.Safety X capacitance connection is in the both ends of input circuit, Ke Yiyou
DM EMI in effect ground filtered input signal, and safety Y capacitance is then connected between phase line and ground wire, it is dry to the common mode of circuit
It disturbs and plays inhibiting effect, safety resistor can greatly improve the EMI ability of current rectifying and wave filtering circuit.EMI module rear is connected to whole
Bridge and electrolytic capacitor are flowed, so that exchange input electricity is converted to steady dc voltage by the rectifying and wave-filtering processing of full-bridge rectification.
Such as Fig. 3, the circuit diagram of shown position control module of the present invention, including control chip U1, diode D2, capacitor C6
~C10, resistance R4~R10；The 1st pin of control chip U1 is connect with one end of one end of the 8th capacitor C8, the 6th resistance R6,
2nd pin is connect with one end of one end of the 5th resistance R5, the 9th resistance R9, and the 3rd pin floating, the 4th pin floating, the 5th draws
Foot is connect with one end of one end of the 6th capacitor C6, the 4th resistance R4, and the 6th pin is connect with one end of the tenth resistance R10, and the 7th
Pin is connect with the other end of the 4th resistance R4, and the 8th pin is connect with the anode of the 7th capacitor C7, the 9th pin and the tenth capacitor
One end of C11, one end connection of the other end, the 9th capacitor C9 of the 8th capacitor C8, the yin of the 10th pin and the second diode D2
One end connection of pole, the 9th resistance R9, the 11st pin connect with power source internal drive module, the 12nd pin and the 9th resistance R9's
It after other end connection and is grounded, the 13rd pin is connect with one end of the 8th resistance R8, the driving mould of the 14th pin and power source internal
Block connection, the 15th pin is connect with the other end of the 8th resistance R8 is followed by power supply VCC, and the 16th pin is another with the 7th resistance R7's
End connection；The other end of 5th resistance R5 is grounded, the other end of the 6th capacitor C6 and the other end, the 7th electricity of the tenth resistance R10
Hold the other end connect and ground of the cathode of C7, the other end of the tenth capacitor C10, the 9th resistance R9, the 6th resistance R6's is another
End is connect with the other end of the 9th capacitor C9, and the other end of the tenth capacitor C10 connects power supply VCC, the anode of the second diode D2
Receiving end Fire_flag as detection signal is connected with spark flashover detection circuit；The diode D2 is Schottky two
Pole pipe, the 7th capacitor C7 are electrolytic capacitor, and the tenth resistance R10 is to adjust swept resistance, control the model SG3525 of chip U1.
In above-mentioned technical proposal, the present invention, as control chip, provides control waveform using SG3525 for drive module.
SG3525 is more suitable for applying in full-bridge inverting topology of the IGBT as power switch tube, and performance is stablized, and peripheral circuit device needs
It asks less and power consumption is smaller, more meet the design objective of this paper.
SG3525 chip belongs to monolithic type high integrated circuit, is mainly used in high frequency switch power, high-voltage inverter, big
The fields such as power charger.Impulse regulator required for all power switch tube control circuits of built-in chip type.Monolith chip
Inside contains reference voltage, error amplifier, pulse width regulator, oscillator with, soft starting circuit and output driving
The modules such as circuit.
The work characteristics of SG3525 is：
(1) possess the internal reference voltage of 5V ± 1%；
(2) possess very wide working frequency concussion range, working frequency can be selected in 100Hz~400kHz；
(3) inside, which possesses oscillation module, has the function of external sync；
(4) internal to contain soft starting circuit, possess the response time of 2S；
(5) output waveform possesses fixed dead time, realizes dead zone modulation by pin；
(6) under-voltage protecting circuit in chip, as power voltage insufficient 8V, chip will stop working, into locking
State；
(7) possess over-voltage, overcurrent and overheating protection module；
The great advantage of SG3525 is that inside possesses complete error amplification module and comparator, and error amplifying circuit is logical
A two-stage differential amplifier composition is crossed, 80dB open loop gain amplifier, the voltage collected by divider resistance are held up to
Signal accesses the inverting input terminal (1 foot) of SG3525, and the positive terminal (2 foot) of error amplifier is connected with reference power supply.Pass through
The error enlarging function of two-stage differential amplifier, completes the closed loop feedback of circuit system.Table 1 lists each pin of SG3525
Function.
Table 1 controls chip SG3525 Pin description
The SPWM signal of control chip output two-way complementation is sent to drive module, opens upper and lower bridge power using drive module
The output for closing pipe is isolated, and the same switching tube of high and low side all the way on main circuit will not be on state simultaneously, make high and low side
Switching tube to complete driving complementary.Control chip supply voltage is 12V, while having overcurrent, over-voltage and short-circuit protection.
SG3525 exports two-way drive waveforms by 11 feet (OUTA) and 14 feet (OUTB), passes through the cunning on 6 feet (R10)
The working frequency of dynamic rheostat R10 control output waveform.10 foot of chip (SD) is overcurrent protection pin, passes through reversed two pole
Pipe is connected with overcurrent acquisition signal.
According to system pulses frequency modulation(PFM) design needs, by 3 foot of useless pin (Sync) of SG3525,4 feet (OSC) with
Ground terminal is directly shorted.8 feet (Soft-StaR10) connect the capacitor of 4.7 μ F and are connected with ground wire, provide 50 μ A to soft start pin
Electric current makes chip operation in soft-start mode.The 12V of 15 feet (VCC) and 13 feet (VC) access accessory power supply powers.9 feet
(Comp) feedback network is accessed between 1 foot (VIO+), for guaranteeing the stabilization of feedback control loop.The present invention compensates net using II type
Network forms a compensator by R6, C8, C9 in figure.
Circuit controls working frequency size using C6, R10 and R4.The 5 foot other ends of C6 connection chip are grounded, and are cores
The concussion capacitor of piece.Its capacitance range is generated required for chip between 0.001uF~0.1uF by its charge and discharge
Sawtooth wave.R10 is concussion capacitance connection to 6 feet, its value determines the charging time of oscillating capacitance C6, and the resistance value the big, fills
The electric time is longer.Whole system realizes that output is adjustable by the control of R10, therefore its value is related to the model of output voltage
It encloses, is under normal circumstances 2k~150K Ω.R4 is that the dead zone resistance of chip is connected to 7 feet, its resistance value determines concussion capacitor
Discharge time.System determines the size of dead time by setting the value of R4, avoids bridge arm direct pass phenomenon, resistance value model
It is trapped among in 0~500 Ω.In a preferred embodiment, the value that C6, R4 has been determined by calculation is respectively 2.7nF, 100
Ω。
Such as Fig. 4, show the circuit diagram of switching tube drive module, including isolating transformer T1, diode D3~D8,
Triode Q1~Q4, metal-oxide-semiconductor Q5~Q6, resistance R13~R17, capacitor C11；The base stage and the second triode of first triode Q1
One end connection of the base stage, eleventh resistor R11 of Q2, the other end of eleventh resistor R11 and 11 pins of control chip U1 connect
It connects, the collector of the first triode Q1 is connect with ground terminal, and the collector of the second triode Q2 is connect with 15V voltage, the one or three pole
The emitter of the emitter of pipe Q1 and the second triode Q2, one end of thirteenth resistor R13, isolating transformer T1 the 1st pin
Connection, the other end of thirteenth resistor R13 are connect with one end of the 11st capacitor C11, the base stage of third transistor Q3 and the 4th
One end connection of the base stage, twelfth resistor R12 of triode Q4, the other end of twelfth resistor R12 and the 12 of control chip U1
Pin connection, the collector of the 4th triode Q4 are connect with ground terminal, and the collector of third transistor Q3 is connect with 15V voltage, the
The emitter of the emitter of three triode Q3 and the 4th triode Q4, one end of the 11st capacitor C11, isolating transformer T1
The connection of 3 pins, the 2nd pin of isolating transformer T1 are connect with one end of the cathode of third diode D3, the 14th resistance R14,
The 5th pin and the anode of the 6th diode D6 of isolating transformer T1, one end of the 16th resistance R16, the first metal-oxide-semiconductor Q5 source
The drain electrode connection of pole, the second metal-oxide-semiconductor Q6, the 6th pin of isolating transformer T1 and cathode, the 15th resistance of the 4th diode D4
One end of R15 connects, the anode of the 4th pin of isolating transformer T1 and the 8th diode D8, the 17th resistance R17 one end,
The other end of the source electrode connect and ground end of second metal-oxide-semiconductor Q5, the anode of third diode D3 and the 14th resistance R14, the 5th
The grid connection of the anode of diode D5, the other end of the 16th resistance R16, the first metal-oxide-semiconductor Q5, the cathode of the 5th diode D5
It is connect with the cathode of the 6th diode D6, the anode of the 4th diode D4 and the other end, the 7th diode of the 15th resistance R15
The grid connection of the anode of D7, the other end of the 17th resistance R17, the second metal-oxide-semiconductor Q6, the cathode and the 8th of the 7th diode D7
The cathode of diode D8 connects, and the drain electrode of the first metal-oxide-semiconductor Q5 and the 310V busbar voltage of current rectifying and wave filtering circuit connect；The isolation
Transformer T1 uses EE22 magnetic core, and armature winding and two secondary windings are respectively around 30 circles, no-load voltage ratio 1：1：1, triode Q1, Q3 are
NPN type triode, triode Q2, Q4 are PNP type triode, and diode D3, D4 model RS1M, diode D5~D8 are pressure stabilizing
For organ, metal-oxide-semiconductor Q5, Q6 model IRFP460.
The present invention drives metal-oxide-semiconductor IRFP460 using transformer, to improve the driving capability of PWM wave in control module.
Such as Fig. 5, it show the circuit diagram of spark flashover detection circuit of the present invention, including logic chip U2, diode
D9~D12, resistance R18~R23, capacitor C11~C12, NPN type triode Q7~Q8, spark inductive sensor L2；Logic chip U2
The 1st pin connect with one end of the 2nd pin, one end of the 21st resistance R21, the 12nd capacitor C12, the 3rd pin and the 4th
Pin connection, the 5th pin connect with the 1st pin, the 6th pin and the 9th pin, the 10th pin, the 12nd capacitor C12 the other end
The base stage of connection, the 7th pin ground connection, the 8th pin and NPN diode Q8 are connected to the output end Fire_flag of detection circuit,
The other end connection of 10th pin, the 12nd capacitor C12, the 12nd pin and the 13rd pin, one section of the second inductance L2, the 18th
One section, the anode of the 9th diode D9, the both ends of the 11st capacitor C11, the both ends of the 20th resistance R20, the tenth of resistance R18
The both ends of one diode D11, NPN type triode Q7 emitter connect and ground, the 14th pin connects 5V power supply；Second inductance L2
The other end connect with one end of the other end of the 18th resistance R18, the 19th resistance R19, the other end of the 19th resistance R19
It is connect with the cathode of the 9th diode D9, the anode of the tenth diode D10, the base stage of NPN triode Q7, the tenth diode D10
Cathode connect and connect 5V power supply with the collector of NPN triode Q7, the other end ground connection of the 21st resistance R21, tri- pole NPN
The collector of pipe Q8 is connect with the anode of one end of the 23rd resistance R23, the 12nd diode D12, the hair of NPN triode Q8
The other end of the cathode connect and ground of emitter-base bandgap grading and the 12nd diode D12, the 23rd resistance R23 is connect with 5V power supply；Institute
Logic chip U2 the model SN74HC00, the 12nd diode D12 stated is LED diode, and the second inductance is Spark plug optical fiber sensor electricity
Sense；The 5V power supply is provided by the accessory power supply of high voltage power supply.
Spark flashover refers under action of high voltage, the destructiveness that gas or liquid medium occur along insulating surface
Electric discharge, this also often occurs on electric precipitator.Spark flashover can be such that the electric current of load end increases rapidly and sparking occurs,
The efficiency of dust collection of deduster also can sharp fall.In order to make electrostatic precipitator work in optimal operating condition, make efficiency of dust collection
Optimum value is maintained, is necessarily required to that spark flashover is detected and controlled.
When electrostatic precipitator flashing flashover, the electric current in output loading can be increased rapidly, and voltage
Horse back is reduced.Flashover detection circuit of the present invention is exactly to be captured according to this characteristic to spark flashover.
Circuit incudes the output of transformer by inductive sensor L2, and transformer output line is worn from inductance circle center
It crosses.Since the curent change of electromagnetic induction phenomenon output end produces induced current on induction coil, to make system acquisition
To flashover signal, induced current becomes the voltage signal of induction, two poles in circuit by the partial pressure amplification of resistance R18 and R19
Pipe D9, D10 play clamped protective effect.The RC differential circuit of R21 and C12 composition utilizes the charge and discharge of capacitor, can be by rectangle
Wave becomes impulse wave, therefore only acquires when signal mutates suddenly and just have output, keeps the feedback of detection system more steady
It is fixed.U2 is that four tunnels 2 input positive NAND gate, includes four independent 2 input nand gates, can be with logical functionOrWhen detecting flashover, U2 can be exported in high level feedback to the indicator light of circuit, indicator light
Start to dodge contracting, and when flashover disappears, U2 can then export low level, system worked well.This circuit utilizes RC circuit
The logic behaviour of derivative characteristic and NAND gate greatly improves the spark flashover Detection accuracy of system, reduce missing inspection with
And the phenomenon that false retrieval, to improve the safety and controllability of deduster.
The course of work：
Line voltage is converted to the 310V voltage of bus by current rectifying and wave filtering circuit by power supply, and control module uses SG3525
The SPWM signal for generating 30kHz or so, is driven by switching tube drive module switch tube, in conjunction with spark flashover signal
Detection carries out feedback control to system.
Spark flashover detection circuit is monitored in real time by output operating condition of the inductive sensor L2 to high voltage power supply, transformer
Output line is passed through from inductance circle center.Since the curent change of electromagnetic induction phenomenon output end produces induction on induction coil
Electric current, to make system acquisition to flashover signal, voltage signal of the induced current by the partial pressure amplification of resistance as induction, electricity
Diode D9, D10 in road play clamped protective effect.The RC differential circuit of R21 and C12 composition utilizes the charge and discharge of capacitor,
Rectangular wave can be become to impulse wave, therefore only acquire when signal mutates suddenly and just have output, make detection system
It feeds back more stable.Logic chip is that four tunnels 2 input positive NAND gate, includes four independent 2 input nand gates, can hold
Row logical functionOrWhen detecting flashover, U2 can export high level, and Fire_flag believes at this time
It number is high level, feedback is on the indicator light of circuit, and indicator light starts to dodge contracting, and the 10th pin of power supply control chip U1 connects at this time
By high level, chip U1 starts to reduce working frequency control output voltage decline, and when flashover disappears, U2 then can be defeated
Low level out, indicator light are worked normally without prompt, control module.
The above description of the embodiment is only used to help understand the method for the present invention and its core ideas.It should be pointed out that pair
For those skilled in the art, without departing from the principle of the present invention, the present invention can also be carried out
Some improvements and modifications, these improvements and modifications also fall within the scope of protection of the claims of the present invention.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (2)
1. a kind of high-pressure dust-cleaning power supply, which is characterized in that including current rectifying and wave filtering circuit, circuit for power conversion, control module, switch
Pipe drive module, auxiliary power circuit and spark flashover detection circuit, wherein the current rectifying and wave filtering circuit is connected with input is exchanged
It connects, for carrying out rectification and EMI filtering to exchange input；The auxiliary power circuit is connected with current rectifying and wave filtering circuit, is used for
It exports DC voltage and provides power supply for the control module and switching tube drive module；The power conversion circuit and rectifying and wave-filtering
Circuit is connected, for exporting high drive electrostatic precipitator；The spark flashover detection circuit is connected with High voltage output, uses
When capturing high-pressure dust-cleaning electric power outputting current spark flashover and spark flashover signal is sent to the control module；It is described
Control module is connect with switching tube drive module, for exporting control signal according to spark flashover signal to adjust the switching tube
The driving signal of drive module output；The switching tube drive module is connected with circuit for power conversion, believes for output driving
Number to adjust the high pressure of circuit for power conversion output；
The current rectifying and wave filtering circuit includes fuse F1, resistance R1~R3, capacitor C1~C5, common mode inductance L1, rectifier bridge D1；
One end of fuse F1 is connect with input alternating current one end, the other end of fuse and one end, the first capacitor C1 of first resistor R1
One end, one end of second resistance R2, common mode inductance L1 the connection of the 1st pin, the other end and alternating current of first resistor R1 input
The other end, the electric other end of a capacitor C1, the other end of second resistance R2, common mode inductance L1 the connection of the 3rd pin, common mode electricity
The 2nd pin of sense L1 is connect with one end of the second capacitor C2, one end of the 4th capacitor C4, the 2nd pin of rectifier bridge D1, the second electricity
Hold the other end of C2 and one end connect and ground of third capacitor C3, the other end of third capacitor C3 and the 4th of common mode inductance L1
The 4th pin connection of pin, the other end of the 4th capacitor C4, rectifier bridge D1, the 3rd pin of rectifier bridge D1 is with 3rd resistor R3's
The other end of the anode connection of one end, the 5th capacitor C5, the 1st pin of rectifier bridge D1 and 3rd resistor R3, the 5th capacitor C5 it is negative
Pole connect and ground end；The first resistor R1 is that varistor type selecting is 20D471K, and first capacitor C1 is X capacitor, the second electricity
Holding C2 and third capacitor C3 is Y capacitance, and the 5th capacitor C5 is electrolytic capacitor；
The control module includes control chip U1, diode D2, capacitor C6~C10, resistance R4~R10；Control chip U1
The 1st pin connect with one end of one end of the 8th capacitor C8, the 6th resistance R6, one end of the 2nd pin and the 5th resistance R5,
One end of nine resistance R9 connects, the 3rd pin floating, the 4th pin floating, one end, the 4th resistance of the 5th pin and the 6th capacitor C6
One end of R4 connects, and the 6th pin is connect with one end of the tenth resistance R10, and the 7th pin is connect with the other end of the 4th resistance R4,
8th pin is connect with the anode of the 7th capacitor C7, one end of the 9th pin and the tenth capacitor C11, the other end of the 8th capacitor C8,
One end of 9th capacitor C9 connects, and the 10th pin is connect with one end of the cathode of the second diode D2, the 9th resistance R9, and the 11st draws
Foot is connect with power source internal switching tube drive module, after the 12nd pin is connect with the other end of the 9th resistance R9 and is grounded, the 13rd
Pin is connect with one end of the 8th resistance R8, the connection of the switching tube drive module of the 14th pin and power source internal, the 15th pin with
The other end connection of 8th resistance R8 is followed by power supply VCC, and the 16th pin is connect with the other end of the 7th resistance R7；5th resistance R5
Other end ground connection, it is the other end of the other end of the 6th capacitor C6 and the tenth resistance R10, the cathode of the 7th capacitor C7, the tenth electric
Hold the other end connect and ground of the other end of C10, the 9th resistance R9, the other end of the 6th resistance R6 is another with the 9th capacitor C9's
One end connection, the other end of the tenth capacitor C10 connect power supply VCC, reception of the anode of the second diode D2 as detection signal
End Fire_flag is connected with spark flashover detection circuit；The diode D2 is Schottky diode, and the 7th capacitor C7 is electricity
Capacitor is solved, the tenth resistance R10 is to adjust swept resistance, controls the model SG3525 of chip U1；
The switching tube drive module include isolating transformer T1, diode D3~D8, triode Q1~Q4, metal-oxide-semiconductor Q5~
Q6, resistance R13~R17, capacitor C11；The base stage of first triode Q1 and the base stage of the second triode Q2, eleventh resistor R11
One end connection, the other end of eleventh resistor R11 connect with 11 pins for controlling chip U1, the collector of the first triode Q1
It is connect with ground terminal, the collector of the second triode Q2 is connect with 15V voltage, the emitter and the second triode of the first triode Q1
The 1st pin connection of the emitter of Q2, one end of thirteenth resistor R13, isolating transformer T1, thirteenth resistor R13's is another
End is connect with one end of the 11st capacitor C11, base stage, the twelfth resistor of the base stage of third transistor Q3 and the 4th triode Q4
One end of R12 connects, and the other end of twelfth resistor R12 is connect with 12 pins of control chip U1, the collection of the 4th triode Q4
Electrode is connect with ground terminal, and the collector of third transistor Q3 is connect with 15V voltage, the emitter of third transistor Q3 and the four or three
The 3rd pin connection of the emitter of pole pipe Q4, one end of the 11st capacitor C11, isolating transformer T1, the of isolating transformer T1
2 pins are connect with one end of the cathode of third diode D3, the 14th resistance R14, the 5th pin of isolating transformer T1 and the 6th
The drain electrode connection of the anode of diode D6, one end of the 16th resistance R16, the source electrode of the first metal-oxide-semiconductor Q5, the second metal-oxide-semiconductor Q6, every
The 6th pin from transformer T1 is connect with one end of the cathode of the 4th diode D4, the 15th resistance R15, isolating transformer T1
The 4th pin and the anode of the 8th diode D8, one end of the 17th resistance R17, the second metal-oxide-semiconductor Q5 source electrode connect and ground
Anode, the 16th resistance R16 of the other end of end, the anode of third diode D3 and the 14th resistance R14, the 5th diode D5
The other end, the first metal-oxide-semiconductor Q5 grid connection, the cathode of the 5th diode D5 connect with the cathode of the 6th diode D6, the
The anode of four diode D4 and the other end of the 15th resistance R15, the anode of the 7th diode D7, the 17th resistance R17 it is another
The grid connection of one end, the second metal-oxide-semiconductor Q6, the cathode of the 7th diode D7 are connect with the cathode of the 8th diode D8, the first MOS
The drain electrode of pipe Q5 and the 310V busbar voltage of current rectifying and wave filtering circuit connect；The isolating transformer T1 uses EE22 magnetic core, primary
Winding and two secondary windings are respectively around 30 circles, no-load voltage ratio 1：1：1, triode Q1, Q3 are NPN type triode, and triode Q2, Q4 are
PNP type triode, diode D3, D4 model RS1M, diode D5~D8 are that pressure stabilizing is organ, metal-oxide-semiconductor Q5, Q6 model
IRFP460；
The spark flashover detection circuit include logic chip U2, diode D9~D12, resistance R18~R23, capacitor C11~
C12, NPN type triode Q7~Q8, spark inductive sensor L2；The 1st pin of logic chip U2 and the 2nd pin, the 21st electricity
One end of R21, one end connection of the 12nd capacitor C12 are hindered, the 3rd pin is connect with the 4th pin, and the 5th pin and the 1st pin connect
Connect, the 6th pin is connect with the other end of the 9th pin, the 10th pin, the 12nd capacitor C12, the 7th pin ground connection, the 8th pin with
The base stage of NPN diode Q8 is connected to the output end Fire_flag of the detection circuit, the 10th pin, the 12nd capacitor C12
Other end connection, the 12nd pin and the 13rd pin, one section of the second inductance L2, one section of the 18th resistance R18, the 9th diode
The anode of D9, the both ends of the 11st capacitor C11, the 20th resistance R20 both ends, the both ends of the 11st diode D11, NPN type
The emitter connect and ground of triode Q7, the 14th pin connect 5V power supply；The other end and the 18th resistance R18 of second inductance L2
The other end, the 19th resistance R19 one end connection, the cathode of the other end of the 19th resistance R19 and the 9th diode D9, the
The base stage connection of the anode, NPN triode Q7 of ten diode D10, the cathode of the tenth diode D10 and the collection of NPN triode Q7
Electrode connects and connects 5V power supply, the other end ground connection of the 21st resistance R21, the collector of NPN triode Q8 and the 23rd
The anode connection of one end of resistance R23, the 12nd diode D12, the emitter of NPN triode Q8 and the 12nd diode D12
Cathode connect and ground, the other end of the 23rd resistance R23 connect with 5V power supply；The logic chip U2 model
SN74HC00, the 12nd diode D12 are LED diode, and the second inductance is Spark plug optical fiber sensor inductance；The 5V power supply is by high pressure
The accessory power supply of power supply provides.
2. high-pressure dust-cleaning power supply according to claim 1, which is characterized in that the circuit for power conversion is become using full-bridge type
Parallel operation.
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| CN201810610333.4A CN108927288A (en) | 2018-06-14 | 2018-06-14 | A kind of high-pressure dust-cleaning power supply |
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| CN201810610333.4A CN108927288A (en) | 2018-06-14 | 2018-06-14 | A kind of high-pressure dust-cleaning power supply |
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| CN113241957A (en) * | 2021-04-20 | 2021-08-10 | 许昌学院 | Intelligent high-voltage corona control system |
| CN113315355A (en) * | 2021-07-02 | 2021-08-27 | 上海空间电源研究所 | High-reliability delay isolation driving circuit for spacecraft |
| CN113394997A (en) * | 2021-08-16 | 2021-09-14 | 南京威登等离子科技设备有限公司 | Digital constant-power high-voltage plasma power supply |
| CN114178052A (en) * | 2021-10-26 | 2022-03-15 | 无锡华德电子科技有限公司 | Electric precipitation control method and system based on transformer loss |
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