CN205921388U - Inverse parallel thyristor phase separating switched capacitor's zero passage triggers control circuit - Google Patents
Inverse parallel thyristor phase separating switched capacitor's zero passage triggers control circuit Download PDFInfo
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- CN205921388U CN205921388U CN201620514065.2U CN201620514065U CN205921388U CN 205921388 U CN205921388 U CN 205921388U CN 201620514065 U CN201620514065 U CN 201620514065U CN 205921388 U CN205921388 U CN 205921388U
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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
- Y02E40/30—Reactive power compensation
Abstract
The utility model discloses an inverse parallel thyristor phase separating switched capacitor's zero passage triggers control circuit, including input and output signals photoelectric isolation unit, control processing unit, zero -crossing detection unit and driving isolation unit, input and output signals photoelectric isolation unit generates low level control signal according to external control signal, sends for control processing unit, the zero -crossing detection unit detects the voltage at thyristor both ends, sends for control processing unit, the drive signal that signal that whether control processing unit equals according to the voltage at thyristor both ends and low level control signal generation control thyristor start, or the stop signal that closes of control thyristor send the unit for driving isolation, the driving isolation unit triggers according to drive signal drive thyristor zero passage to and trigger according to the zero passage of stop signal stop driving thyristor. Above -mentioned zero passage triggers the non - zero passage that control circuit can prevent the thyristor and triggers.
Description
Technical field
This utility model is related to reactive-load compensation and power quality controlling technical field, more particularly to a kind of inverse parallel crystalline substance lock
The zero cross fired control circuit of pipe split-phase switched capacitor.
Background technology
With socio-economic development and technological progress, the application of powerful power electronic equipment is so that in electrical network in a large number
Large Copacity reactive power disappearance, power factor is low, the increase of voltage x current harmonic content, imbalance of three-phase voltage etc., the quality of power supply
Deteriorate serious.And traditional catalyst switched capacitor reactive power compensating apparatus, in low-pressure high-power reactive-load compensation field
The requirement of reactive-load compensation rapidity, accuracy, economy, reliability cannot be met.Therefore as a kind of scheme of more optimization
Thyristor switchable capacitor (tsc) equipment is widely used in low-voltage power system high-power reactive-load compensation field.Should
Equipment can quickly follow load change, accurately and reliably switched capacitor, effective stabilisation systemss voltage, suppress or filter harmonic wave,
Improve power factor, improve system imbalance of three-phase voltage, improve system power quality.The core of thyristor switchable capacitor equipment
The heart is IGCT zero cross fired control circuit, and if the zero cross signal inaccurate, trigger timing of collection is unreasonable, then can lead to crystalline substance
The non-zero cross fired of brake tube, thus electrical network is produced shoving impact, or trigger pulse is unreasonable, secondary current flow, more can damage crystalline substance
Brake tube module.
Utility model content
The technical problems to be solved in the utility model is for above-mentioned the deficiencies in the prior art, provides one kind to be prevented from crystalline substance
The zero cross fired control circuit of the anti-parallel thyristor split-phase switched capacitor of the non-zero cross fired of brake tube, can extend the IGCT longevity
Life.
For solving above-mentioned technical problem, technical solution adopted in the utility model is: a kind of anti-parallel thyristor split-phase
The zero cross fired control circuit of switched capacitor, including input/output signal phototube coupling unit, control process unit, zero passage inspection
Survey unit and drive isolated location；Described control process unit respectively with described input/output signal phototube coupling unit, described
Zero passage detection unit and described driving isolated location connect；
Described input/output signal phototube coupling unit, for low level control signal is generated according to external control signal,
And it is sent to described control process unit；
Described zero passage detection unit, for detecting the voltage at IGCT two ends, and is sent to described control process unit；
Described control process unit, the whether equal signal of the voltage for receiving described IGCT two ends and described low electricity
Flat control signal, generates according to the whether equal signal of the voltage at described IGCT two ends and described low level control signal and controls
The drive signal that described IGCT starts, or control the stop signal of described IGCT closing, it is sent to described driving isolation single
Unit；
Described driving isolated location, for described IGCT zero cross fired is driven according to described drive signal, and according to
Described stop signal stops driving the zero cross fired of described IGCT.
Preferably, temperature detecting unit and air-blower control unit are also included；Described temperature detecting unit and described blower fan control
Unit processed is all connected with described control process unit；
Described temperature detecting unit, for detecting the Current Temperatures of described IGCT, and described Current Temperatures are sent to institute
State control process unit；
Described control process unit, is additionally operable to receive described Current Temperatures, and it is default to reach first in described Current Temperatures
During temperature, generate air-blower control signal；And control described crystalline substance lock is generated when described Current Temperatures are higher than the second preset temperature
The stop signal that pipe is closed；
Described air-blower control unit is used for controlling radiation air corresponding with described IGCT according to described air-blower control signal
Machine works；
Wherein, described second preset temperature is more than described first preset temperature.
Preferably, described air-blower control unit includes control relay, the first fly-wheel diode and filter capacitor；Described control
The negative pole of relay processed electrically connect with described output input signal Phototube Coupling unit, the positive pole of described control relay connection the
One external power supply, the normally opened node of output of described control relay connects the second external power supply, is that described cooling fan is powered；
Described first fly-wheel diode inverse parallel is at the two ends of described control relay；
Described filter capacitor is connected in parallel on the n pole exporting normally opened node and described second external power supply of described control relay
Between.
Preferably, described temperature detecting unit includes temperature sensing circuit, the first temperature switch protection circuit and the second temperature
Degree switch protecting circuit；Described temperature sensing circuit, described first temperature switch protection circuit and described second temperature switch are protected
Protection circuit is all connected with described control process unit；
Described temperature sensing circuit, for detecting the temperature of described IGCT；
Described first temperature switch protection circuit, is higher than described first preset temperature for the temperature in described IGCT
When, send the first signal to described control process unit；Described control process unit wind according to described first signal generation
Machine control signal；
Described second temperature switch protecting circuit, is higher than described second preset temperature for the temperature in described IGCT
When, send secondary signal to described control process unit；Described control process unit generates according to described secondary signal and controls institute
State the stop signal of IGCT closing.
Preferably, display unit and insulating power supply unit are also included；Described display unit is with described control process unit even
Connect；Described insulating power supply unit is described control process unit and described display unit is powered；
Described control process unit is additionally operable to when generating the stop signal controlling described IGCT closing, to described display
Unit sends fault message；Described display unit, for showing described fault message；
Described insulating power supply unit include the first isolating transformer, the first diode single-phase rectification bridge, three rectify voltages steady
Depressor, light emitting diode and first resistor；The primary side of described first isolating transformer is electrically connected with the 6th external power supply, secondary
Side is connected with the ac input end of described first diode single-phase rectification bridge；The direct current of described first diode single-phase rectification bridge is defeated
The input that the positive pole going out end rectifies Voltagre regulator with described three electrically connects, and negative pole rectifies connecing of Voltagre regulator with described three
Ground terminal electrically connects；Described light emitting diode is connected with described first resistor, and the light emitting diode after series connection and first resistor are in parallel
Between described three earth terminals rectifying Voltagre regulator and outfan.
Preferably, described insulating power supply unit also includes short-circuit protection fuse, the first flat wave capacitor, the first energy storage electricity
Appearance, the second flat wave capacitor and the second storage capacitor；
The primary side of described first isolating transformer passes through described short-circuit protection fuse and described 6th external power supply electricity
Connect；
Described first flat wave capacitor and described first storage capacitor are in parallel, and it is single-phase to be integrally connected in parallel on described first diode
Between the positive pole of rectifier bridge and negative pole；
Described second flat wave capacitor and described second storage capacitor are in parallel, and entirety is connected in parallel on described three and rectifies voltage voltage stabilizings
Between the output and ground of device.
Preferably, described input/output signal phototube coupling unit includes more than one input signal photoelectric isolating circuit
With more than one output signal photoelectric isolating circuit；
Each described input signal photoelectric isolating circuit all includes the first photo-coupler and the 4th pull-up resistor；Described first
First pin of photo-coupler is connected with the positive pole of the 7th external power supply, and second pin receives external control signal, the 3rd pin
Ground connection, the 4th pin is electrically connected with described control process unit, and is electrically connected with the 8th external power supply by the 4th pull-up resistor；
Each described output signal photoelectric isolating circuit all includes the second photo-coupler and the 5th pull-up resistor；Described second
First pin of photo-coupler is connected with described 8th external power supply by described 5th pull-up resistor, second pin and described control
Processing unit processed connects, and the 3rd pin is connected with the negative pole of described 7th external power supply, the 4th pin outputs level signals.
Preferably, described zero passage detection unit includes more than one zero cross detection circuit；Each described zero passage detection electricity
The corresponding phase voltage detecting described IGCT two ends in road；Each described zero cross detection circuit all include the 3rd photo-coupler, three
Pole pipe and current-limiting resistor voltage divider；Described IGCT includes two the first IGCTs in parallel and the second IGCT；
First pin of described 3rd photo-coupler is electrically connected with described IGCT by the 6th pull-up resistor, second pin
Electrically connect with the colelctor electrode of described audion, the 4th pin is electrically connected with described control process unit；The base stage of described audion
Electrically connect with described current-limiting resistor voltage divider；
The emitter-base bandgap grading of described audion is used for electrically connecting with the k pole of described first IGCT；
The other end of described current-limiting resistor voltage divider is used for electrically connecting with the k pole of described second IGCT.
Preferably, described zero cross detection circuit also includes resistance capaciting absorpting circuit and the second fly-wheel diode；Described capacitance-resistance is inhaled
Receive circuit and described second fly-wheel diode is in parallel；
Described resistance capaciting absorpting circuit is connected in parallel between base stage and the emitter stage of described audion；
Described second fly-wheel diode is connected in parallel between base stage and the emitter stage of described audion, and described second afterflow two
The positive pole of pole pipe is electrically connected with the emitter stage of described audion, the negative pole of described second fly-wheel diode and the base of described audion
Pole electrically connects.
Preferably, described driving isolated location includes more than one driving isolation circuit；Each described driving isolates electricity
Road corresponds to a described zero cross detection circuit；
Described driving isolation circuit all includes the second isolating transformer, the second diode single-phase rectification bridge, power are opened for each
Close pipe and the 4th photo-coupler；
The primary side of described second isolating transformer is electrically connected with the 9th external power supply, secondary side and described second diode
The ac input end of single-phase rectification bridge connects；
The described positive pole of DC output end of the second diode single-phase rectification bridge is electrically connected with the s pole of described power switch,
Negative pole is electrically connected with the d pole of described power switch；
First pin of described 4th photo-coupler connects the tenth external power supply, and second pin is electrically connected with control process unit
Connect, the 3rd pin is electrically connected with the d pole of described power switch, the 4th pin is electrically connected with the g pole of described power switch.
Using having the beneficial effects that technique scheme is generated: control process unit is in the voltage phase at IGCT two ends
Deng when, according to input/output signal phototube coupling unit send low level control signal generate control IGCT start driving
Signal；And when the voltage at IGCT two ends is unequal, generate the stop signal controlling IGCT to close, such that it is able to prevent
The non-zero cross fired of IGCT, reduces the impact of shoving that electrical network is produced, and preferably protects thyristor module.Thyristor series capacitor
Device equipment can achieve high-power quick, accurately, reliability, phase splitting compensation reactive power, single compensation branch road maximum up to 3 ×
175kvar.
Further, zero passage detection unit adopts IGCT both end voltage direct measurement mode, precise control, and zero crossing is examined
Surveying and controlling is not affected by harmonic voltage, electric current, frequency and condenser voltage discharge and recharge, stable and reliable in work.Temperature detection list
Unit, by detecting thyristor module temperature conditionss, controls cooling fan to start, and the timely cutoff thyristor when IGCT is overheated
Module, protection thyristor module and other equipment are not damaged by.And insulating power supply unit is carried out using in AC and driving side
Double isolation, it is possible to increase the reliability of circuit, are prevented effectively from and are only isolated in low-voltage direct side and isolating device mistake is occurred
Press the Failure risk puncturing.
Brief description
Fig. 1 is structural representation of the present utility model；
Fig. 2 is the circuit diagram of temperature sensing circuit in temperature detecting unit of the present utility model；
Fig. 3 is the circuit diagram of the first temperature switch protection circuit in temperature detecting unit of the present utility model；
Fig. 4 is the circuit diagram of second temperature switch protecting circuit in temperature detecting unit of the present utility model；
Fig. 5 is the circuit diagram of air-blower control unit of the present utility model；
Fig. 6 is the circuit diagram of insulating power supply unit of the present utility model；
Fig. 7 is the circuit of input signal photoelectric isolating circuit in input/output signal phototube coupling unit of the present utility model
Figure；
Fig. 8 is the circuit of output signal photoelectric isolating circuit in input/output signal phototube coupling unit of the present utility model
Figure；
Fig. 9 is the circuit diagram of a zero cross detection circuit in zero passage detection unit of the present utility model；
Figure 10 is the circuit diagram driving a driving isolation circuit in isolated location of the present utility model；
Figure 11 is the circuit diagram of single-chip microcomputer stc12c5608 of the present utility model.
Specific embodiment
With reference to the accompanying drawings and detailed description this utility model is described in further detail.
Referring to Fig. 1, in an embodiment, the zero cross fired control circuit of anti-parallel thyristor split-phase switched capacitor is permissible
Including: input/output signal phototube coupling unit 100, control process unit 300, zero passage detection unit 200 and driving isolation are single
Unit 400.Wherein, control process unit 300 respectively with input/output signal phototube coupling unit 100, zero passage detection unit 200 and
Isolated location 400 is driven to connect.Input/output signal phototube coupling unit 100, for generating low electricity according to external control signal
Flat control signal, and it is sent to control process unit 300.Zero passage detection unit 200, the voltage for detecting IGCT two ends is
No equal, and it is sent to control process unit 300.Control process unit 300, for receiving the voltage whether phase at IGCT two ends
Deng signal and low level control signal, the whether equal signal of the voltage according to IGCT two ends and low level control signal life
Become to control the drive signal that IGCT starts, or generate the stop signal controlling IGCT to close, be sent to driving isolated location
400.Drive isolated location 400, for driving IGCT zero cross fired according to drive signal, and stop driving according to stop signal
The zero cross fired of dynamic IGCT.Specifically, control process unit 300 is when the voltage at IGCT two ends is equal, according to low level
Control signal generates the drive signal controlling IGCT to start；When the voltage at IGCT two ends is unequal, generates and control brilliant lock
The stop signal that pipe is closed.
Referring to Fig. 1, in an embodiment, zero cross fired control circuit can also include temperature detecting unit 500 and blower fan
Control unit 600.Temperature detecting unit 500 and air-blower control unit 600 are all connected with control process unit 300.Temperature detection
Unit 500, for detecting the Current Temperatures of IGCT, and the Current Temperatures detecting is sent to control process unit 300.Control
Processing unit 300 processed receives this Current Temperatures, and temperature is higher than to generate air-blower control signal during the first preset temperature in this prior,
It is sent to air-blower control unit 600 by exporting input signal Phototube Coupling unit 100.
Further, control process unit 300 can be also used for temperature in this prior is higher than to generate during the second preset temperature
Control the stop signal that IGCT is closed.Air-blower control unit 600 is used for corresponding with IGCT according to the control of air-blower control signal
Cooling fan work.Wherein, the second preset temperature is more than the first preset temperature.For example, the first preset temperature can be 50 DEG C,
Second preset temperature can be 80 DEG C.
As a kind of embodiment, temperature detecting unit 500 can include temperature sensing circuit, the first temperature switch is protected
Protection circuit and second temperature switch protecting circuit.Wherein, temperature sensing circuit, the first temperature switch protection circuit and second temperature
Switch protecting circuit is all connected with control process unit 300.Temperature sensing circuit, for detecting the temperature of IGCT.First temperature
Degree switch protecting circuit, for when the temperature of IGCT is higher than the first preset temperature, sending first to control process unit 300
Signal.Control process unit 300 is according to the first signal generation air-blower control signal.Second temperature switch protecting circuit, for
When the temperature of IGCT is higher than the second preset temperature, send secondary signal to control process unit 300.Control process unit 300
The stop signal controlling IGCT to close is generated according to secondary signal.
Referring to Fig. 2, in an embodiment, temperature sensing circuit can include digital temperature sensor and the first pull-up resistor
r22.In the present embodiment, digital temperature sensor select model ds18b20 digital temperature sensor, but not as
Limit.First pin of digital temperature sensor ds18b20 is connected with the 3rd external power supply.Digital temperature sensor ds18b20's
Second pin is connected with control process unit 300, and is connected with the 3rd external power supply by the first pull-up resistor r22.Numeral temperature
The 3rd pin ground connection of degree sensor ds18b20.Wherein, the 3rd external power supply can be the external power supply of+5v.
Referring to Fig. 3, in an embodiment, the first temperature switch protection circuit can be included on the first temperature switch and second
Pull-up resistor r6.In the present embodiment, the first temperature switch can select model b050-10 temperature switch, but not as
Limit.First pin of the first temperature switch b050-10 is connected with control process unit 300, and by the second pull-up resistor r6 with
4th external power supply connects.The second pin ground connection of the first temperature switch b050-10.Wherein, the 4th external power supply can be+5v
External power supply.First temperature switch
Referring to Fig. 4, in an embodiment, second temperature switch protecting circuit can be included on second temperature switch and the 3rd
Pull-up resistor r7.In the present embodiment, second temperature switch can select model b080-10 temperature switch, but not as
Limit.The first pin that second temperature switchs b080-10 is connected with control process unit 300, and by the 3rd pull-up resistor r7 and
5th external power supply connects.Second temperature switchs the second pin ground connection of b080-10.Wherein, the 5th external power supply can be+5v
External power supply.
IGCT actual temperature value is detected by temperature sensing circuit, in order to start cooling fan and overtemperature prote.Pass through
First temperature switch protection circuit, the first temperature switch protection circuit realize dual-temperature protection.When IGCT temperature is more than
During one preset temperature (such as 50 DEG C), the first temperature switch b050-10 opens, and generates the first signal and is sent to control process unit
300.Control process unit 300 according to the first signal generation air-blower control signal, by exporting input signal Phototube Coupling unit
100 are sent to air-blower control unit 600.When IGCT temperature is more than the second preset temperature (80 DEG C), the 2nd b080-10 is normally closed
Node is opened, and generates secondary signal and is sent to control process unit 300.Control process unit 300 generates control according to secondary signal
The stop signal that combinations brake tube cuts out, thus protect IGCT.Setting temperature detecting unit 500, by detecting thyristor module
Temperature conditionss, to control cooling fan to start, and the timely cutoff thyristor module when IGCT is overheated, protect thyristor module
And other equipment is not damaged by.
Referring to Fig. 5, in an embodiment, air-blower control unit 600 can include control relay 610, the first afterflow two
Pole pipe d41 and filter capacitor c_fan.The negative pole of control relay 610 is electrically connected with output input signal Phototube Coupling unit 100
Connect.The positive pole of control relay 610 connects the first external power supply.The normally opened node of output of control relay 610 connects outside second
Connect power supply, be that cooling fan is powered.First fly-wheel diode d41 inverse parallel is at the two ends of control relay 610.First afterflow two
The negative pole of pole pipe d41 is connected with the first external power supply, the positive pole of the first fly-wheel diode d41 and the negative pole of control relay 610
Connect.Filter capacitor is connected in parallel between the normally opened node of output of control relay 610 and the n pole of the second external power supply.Wherein,
One external power supply can be the external power supply of+12v, and the second external power supply can be the external power supply of ac220v.
Referring to Fig. 1, in an embodiment, zero cross fired control circuit can also include display unit 700.Display unit
700 are connected with control process unit 300.Control process unit 300 is additionally operable to generating the stop signal controlling IGCT to close
When, send fault message to display unit 700.Display unit 300 is used for showing this fault message.
Referring to Fig. 1, in an embodiment, zero cross fired control circuit can also include insulating power supply unit 800.Isolation electricity
Source unit 800 is control process unit 300 and display unit 700 is powered.Specifically, referring to Fig. 6, can embodiment party as one kind
Formula, insulating power supply unit 800 can include the first isolating transformer tr0, the first diode single-phase rectification bridge 810, three rectifies electricity
Pressure manostat p0, light emitting diode pwr and first resistor r24.The primary side of the first isolating transformer tr0 and the 6th external power supply
Electrical connection, the secondary side of the first isolating transformer tr0 is connected with the ac input end of the first diode single-phase rectification bridge 810.The
The input that the positive pole of DC output end of one diode single-phase rectification bridge 810 rectifies Voltagre regulator p0 with three electrically connects.The
The earth terminal that the negative pole of DC output end of one diode single-phase rectification bridge 810 rectifies Voltagre regulator p0 with three electrically connects.Send out
Optical diode pwr is connected with first resistor r24, and the light emitting diode pwr after series connection and first resistor r24 are connected in parallel on three and rectify electricity
Between the earth terminal of pressure manostat p0 and outfan.Wherein, three inputs rectifying Voltagre regulator p0 are the vin in Fig. 6
End, three outfans rectifying Voltagre regulator p0 are the vout end in Fig. 6, and three earth terminals rectifying Voltagre regulator p0 are
Gnd end in Fig. 6.6th external power supply can be the external power supply of ac220v.
Further, referring to Fig. 6, insulating power supply unit 800 can also include short-circuit protection fuse fu, the first flat ripple electricity
Hold c101, the first storage capacitor e1, the second flat wave capacitor c102 and the second storage capacitor e2.The one of first isolating transformer tr0
Secondary side is electrically connected with the 6th external power supply by short-circuit protection fuse fu.First flat wave capacitor c101 and the first storage capacitor e1
Parallel connection, and be integrally connected in parallel between positive pole and the negative pole of the first diode single-phase rectification bridge 810.Second flat wave capacitor c102 and
Two storage capacitor e2 are in parallel, and entirety is connected in parallel between three output and grounds rectifying Voltagre regulator p0.
The insulating power supply circuit of insulating power supply unit 800 carries out double isolation using in AC and driving side, improves electricity
The reliability on road, can be prevented effectively from and only be isolated in low-voltage direct side and occurred the fault of isolating device over-voltage breakdown to endanger
Danger.
As a kind of embodiment, input/output signal phototube coupling unit 100 can include more than one input
Signal photoelectric isolating circuit and more than one output signal photoelectric isolating circuit.
Referring to Fig. 7, included as a example three input signal photoelectric isolating circuits by input/output signal phototube coupling unit 100
Illustrate.Each input signal photoelectric isolating circuit can all include the first photo-coupler (photo-coupler g1, photo-coupler g2
Or photo-coupler g3) and the 4th pull-up resistor (pull-up resistor r1, pull-up resistor r2 or pull-up resistor r3).First photo-coupler
First pin is connected with the positive pole of the 7th external power supply.The second pin of the first photo-coupler receives external control signal.First
3rd pin ground connection of photo-coupler.4th pin of the first photo-coupler is electrically connected with control process unit 300, and by the
Four pull-up resistors are electrically connected with the 8th external power supply.Wherein, the 7th external power supply can be the external power supply of+12v, and the 8th is external
Power supply can be the external power supply of+5v.8th external power supply is the working power of the first photo-coupler.In the present embodiment, first
Photo-coupler can select the photo-coupler of model tlp785, but is not limited thereto.
Referring to Fig. 8, included as a example two output signal photoelectric isolating circuits by input/output signal phototube coupling unit 100
Illustrate.Each output signal photoelectric isolating circuit can all include the second photo-coupler (photo-coupler g10 or photo-coupler
) and the 5th pull-up resistor (pull-up resistor r12 or pull-up resistor r13) g11.First pin of the second photo-coupler passes through on the 5th
Pull-up resistor is connected with the 8th external power supply, and the second pin of the second photo-coupler is connected with control process unit 300, the second optocoupler
3rd pin of clutch is connected with the negative pole of the 7th external power supply, the 4th pin outputs level signals of the second photo-coupler.Its
In, the second photo-coupler can select the photo-coupler of model tlp627, but is not limited thereto.
Specifically, input/output signal phototube coupling unit 100 can include three input signal photoelectric isolating circuits and
Two output signal photoelectric isolating circuits.Three input signal photoelectric isolating circuits correspond to a phase, b phase and c phase external control respectively
Input signal.Two output signal photoelectric isolating circuits correspond to air-blower control signal, thyristor driver fault output signal respectively.
As a kind of embodiment, zero passage detection unit 200 can include more than one zero cross detection circuit.Each
One phase voltage at zero cross detection circuit corresponding detection IGCT two ends.Referring to Fig. 9, in an embodiment, each zero passage detection electricity
Road can all include the 3rd photo-coupler g6, audion q1 and current-limiting resistor voltage divider.In the present embodiment, IGCT includes two simultaneously
First IGCT of connection and the second IGCT.First pin of the 3rd photo-coupler g6 passes through the 6th pull-up resistor r30 and first
The positive pole electrical connection of the driving insulating power supply of IGCT.The second pin of the 3rd photo-coupler g6 is electric with the colelctor electrode of audion q1
Connect.The 3rd pin ground connection of the 3rd photo-coupler g6.4th pin of the 3rd photo-coupler g6 and control process unit 100 electricity
Connect.The base stage of audion q1 is electrically connected with current-limiting resistor voltage divider.The emitter-base bandgap grading of audion q2 is used for extremely electric with the k of the first IGCT
Connect, and electrically connect with the negative pole of the driving insulating power supply of the first IGCT.The other end of current-limiting resistor voltage divider is used for and second
The k pole electrical connection of IGCT, and electrically connect with the negative pole of the driving insulating power supply of the second IGCT.
Further, referring to Fig. 9, zero cross detection circuit can also include resistance capaciting absorpting circuit 210 and the second afterflow two pole
Pipe d30.Resistance capaciting absorpting circuit 210 and the second fly-wheel diode d30 are in parallel.Resistance capaciting absorpting circuit 210 is connected in parallel on audion q1's
Between base stage and emitter stage.Second fly-wheel diode d30 inverse parallel is between the base stage of audion q1 and emitter stage.And second is continuous
The positive pole of stream diode d30 is electrically connected with the emitter stage of audion q1, and the negative pole of the second fly-wheel diode d30 is with audion q1's
Base stage electrically connects.Resistance capaciting absorpting circuit 210 can include electric capacity and the resistance being in parallel, electric capacity c14 as shown in Figure 9 and electricity
Resistance r28.
In the present embodiment, current-limiting resistor voltage divider can include multiple resistance being in series.For example, in Fig. 9, partial pressure current limliting electricity
Resistance includes resistance r101 to resistance r105, totally five resistance.In addition, the 3rd photo-coupler g6 can select model tlp627
Photoelectrical coupler, but be not limited thereto.The zero cross detection circuit of zero passage detection unit 200 adopts IGCT both end voltage direct
Metering system, precise control, zero passage electro-detection and control are not subject to harmonic voltage, electric current, frequency and condenser voltage charge and discharge film
Ring, stable and reliable in work.
Below, zero cross detection circuit is further described taking a phase zero cross detection circuit as a example.As shown in figure 9, a phase
Zero cross detection circuit mainly include photo-coupler tlp627, npn low-power transistor 9013 and current-limiting resistor voltage divider r101～
r105.X1, x2 are the drive end of two anti-parallel thyristors of a phase, and wherein 2 pins connect the k pole of IGCT, by anti-parallel thyristor
The k1 pole of 1 pipe is connected to the emitter-base bandgap grading of audion q1, and is connected with the driving insulating power supply negative pole of anti-parallel thyristor 1 pipe.Inverse parallel
The k2 pole of IGCT 2 pipe is connected to the base stage of audion q1 through current-limiting resistor voltage divider r101～r105 and biasing resistor r29, and with anti-
The driving insulating power supply negative pole of parallel thyristors 2 pipe is connected.The colelctor electrode of audion q1 is connected to 2 feet of photo-coupler tlp627.
1 foot of photo-coupler tlp627 is connected to, through the 6th pull-up resistor r30, the positive pole that anti-parallel thyristor 1 pipe drives insulating power supply.Light
4 feet of bonder tlp627 are connected to 5v working power positive pole, the 3 foot ground connection of photo-coupler tlp627, optocoupler through pull-up resistor r8
4 feet of clutch tlp627 are connected with control process unit 300.The base stage of audion q1 resistance capaciting absorpting circuit in parallel between emitter-base bandgap grading
210, one fly-wheel diode d30 of inverse parallel simultaneously.
Wherein, voltage u between k1, k2k2k1Voltage difference for anti-parallel thyristor two ends.When anti-parallel thyristor both end voltage
When equal, audion q1 ends, and 4 pins of photo-coupler g6 export high level signal to control process unit 300.Work as inverse parallel
When IGCT both end voltage is unequal, audion q1 turns on, and 4 pins of photo-coupler g6 export low level signal to control process
Unit 300.Thus, control process unit 300 receives IGCT a phase voltage zero cross signal.
In addition, b phase zero cross detection circuit is identical with a phase zero cross detection circuit structure with c phase zero cross detection circuit, b phase mistake
Zero testing circuit is identical with the operation principle of c phase zero passage detection, therefore will not be described here.
As a kind of embodiment, drive isolated location 400 can include more than one driving isolation circuit.Each
Isolation circuit is driven to correspond to a zero cross detection circuit.Referring to Figure 10, in an embodiment, each drives isolation circuit all to include
Second isolating transformer tr1, the second diode single-phase rectification bridge 410, power switch 420 and the 4th photo-coupler g12.Second every
Primary side from transformator tr1 is electrically connected with the 9th external power supply.The secondary side of the second isolating transformer tr1 and the second diode
The ac input end of single-phase rectification bridge 410 connects.The positive pole of DC output end of the second diode single-phase rectification bridge 410 and power
The s pole electrical connection of switch 420.The negative pole of DC output end of the second diode single-phase rectification bridge 410 and the d of power switch 420
Pole electrically connects.First pin of the 4th photo-coupler g12 connects the tenth external power supply.The second pin of the 4th photo-coupler g12 with
Control process unit 300 electrically connects.3rd pin of the 4th photo-coupler g12 is electrically connected with the d pole of power switch 420.4th
4th pin of photo-coupler g12 is electrically connected with the g pole of power switch.
In the present embodiment, the 4th photo-coupler g12 can select the photo-coupler of model tlp627, power switch 420
The power switch of model irf7416 can be selected.9th external power supply can be the external power supply of ac220v, the tenth external electricity
Source can be the external power supply of+5v.
Driven as a example isolation circuit by a phase below, be further described to driving isolation circuit.As shown in Figure 10, a phase
Isolation circuit is driven mainly to include isolating transformer tr1, diode single-phase rectification bridge 410, power switch 420(model
Irf7416), photo-coupler g12(model tlp627).Outside single-phase ac220v power supply is through isolating transformer tr1, diode list
Commutating phase bridge 410 and filter capacitor c104 and storage capacitor e4 produce trigger pulse.Control process unit 100 is through photo-coupler
Connect to g pole 4 foot of power switch 420 after g12 isolation.S pole 1,2,3 foot of power switch 420 connects to trigger pulse power supply
Positive pole.G, s interpolar parallel filtering resistance-capacitance circuit filtering of power switch 420.In the present embodiment, this filtering resistance-capacitance circuit includes
Electric capacity c11 and resistance r25.The filtered electric capacity c12 of d pole 5,6,7,8 foot of power switch 420 connects negative to trigger pulse power supply
Pole.The g1 pole of a phase IGCT 1 pipe is electrically connected to the d pole of power switch 420 through resistance r1a and resistance r1b.A phase IGCT 1 is managed
K1 pole connect to the negative pole of trigger pulse power supply.Between the g1 pole of a phase IGCT 1 pipe and k1 pole, parallel connection is by electric capacity c13 and electricity
The resistance capaciting absorpting circuit that resistance r27 is constituted, one fly-wheel diode d29 of inverse parallel simultaneously.
After control process unit 300 receives external control signal, output low level generates trigger, through optical coupling
Device g12 generates and drives isolation signals.The pmos1 conducting of power switch 420, x1 receives drive pulse signal, the first IGCT a
It is conducted.In addition, in the present embodiment, driving isolated location 400 to include a phase and drive isolation circuit, b phase to drive isolation circuit and c
Mutually drive isolation circuit.B phase drives isolation circuit to drive isolation circuit to drive isolation circuit composition identical with a phase with c phase, therefore
This repeats no more.
Referring to Figure 11, in an embodiment, control process unit 300 can be single-chip microcomputer stc12c5608.Specifically, single
3 feet of piece machine stc12c5608 connect the power-on reset signal of rc reset circuit generation.The 4 of single-chip microcomputer stc12c5608,5 foot warps
1,2 feet of external 4 pin terminal j-com and display unit 700 communicate.3,4 feet through j-com for the display unit 700 respectively with 5v and
Gnd is connected, and powers to display unit 700.The 6 of single-chip microcomputer stc12c5608,7 feet connect the crystal oscillator of 24m.Single-chip microcomputer stc12c5608
Other each pin and physical circuits of other units between annexation may be referred to accompanying drawing, here is no longer superfluous
State.Certainly, in other embodiments, control process unit 300 can be the single-chip microcomputer of other models, such as stc12c5620ad system
The single-chip microcomputer of row.
When there is the order controlling IGCT to put into a phase (or b phase, c phase) outside, 19 feet of single-chip microcomputer stc12c5608
(or 20,21 feet) can detect lasting low level signal.Then when 11 feet (or 12 feet, 17 feet) of single-chip microcomputer stc12c5608 are examined
(represent that a phase or b phase, c phase thyristor voltage are zero) when measuring high level signal, 10 feet of single-chip microcomputer stc12c5608,15 feet
(or 13 feet, 2 feet or 9 feet, 8 feet) output low level trigger controls a phase (b phase, c phase) anti-parallel thyristor 1,2 pipe conductings.
Simultaneously pass through detect a phase (b phase, c phase) zero cross detection circuit output to single-chip microcomputer stc12c5608 11 feet (or 12 feet, 17
Foot) whether signal be always high level signal, and to detect whether a phase IGCT (or b phase, c phase) is reliable and to trigger.If reliable touch
Send out, 10 feet of single-chip microcomputer stc12c5608,15 feet (or 13 feet, 2 feet or 9 feet, 8 feet) will persistently export low level trigger,
19(or 20,21 feet until single-chip microcomputer stc12c5608) high level signal is detected, 10 feet of single-chip microcomputer stc12c5608,15
Foot (or 13 feet, 2 feet or 9 feet, 8 feet) just can stop exporting lasting low level signal；Otherwise, stop output and continue low level letter
Number, single-chip microcomputer stc12c5608 generates triggering fault-signal, and 3,4 feet by single-chip microcomputer stc12c5608 and display unit
700 communications, show driving malfunction information on the interface of display unit 700.
Below taking a phase voltage as a example, the work process of zero cross fired control circuit is described.
It should be understood that having a phase to put into life when input/output signal phototube coupling unit 100 detects external control signal
When making (19 feet of single-chip microcomputer are to continue Low level effective signal), a phase voltage mistake is detected by a phase zero cross detection circuit simultaneously
Zero (11 feet of single-chip microcomputer detect high level signal), control process unit 300 generates the drive signal of a phase, drive signal warp
Crossing a phase drives isolation circuit to generate the trigger pulse of a phase IGCT.If now triggering successfully, the zero cross detection circuit of a phase
Continuous and effective signal (11 feet of single-chip microcomputer detect permanent High level signal) can be detected.If can't detect the zero passage letter of a phase
Number continuous and effective, then judge that a phase IGCT damages, control process unit 300 generates the stop signal controlling IGCT to close, and enters
Row protection is shut down.After input/output signal phototube coupling unit 100 detects the excision order of external control a phase, stop a first
Phase trigger, then whether the zero cross signal of detection a phase is invalid signals.Because if a phase IGCT reliable turn-off, then
IGCT both end voltage is unequal, and zero cross signal is invalid.
Example thyristor switchable capacitor (tsc) equipment of the present utility model can achieve high-power quick, accurately, reliable,
Phase splitting compensation reactive power, single compensation branch road maximum is up to 3 × 175kvar.The brilliant lock of 2 control 3 of the conversion according to utility model
Pipe switched capacitor (tsc) equipment can achieve that three phase reactive power is mended altogether, and single compensation branch road maximum is up to 400kvar.
By such scheme it is ensured that IGCT no-voltage reliably puts into, zero current is reliably excised, switching process no swell
Stream, no impacts to electrical network it is ensured that enabling accurate, quick, the reliable switching capacitance of IGCT after receiving external control signal
Device.Zero passage detection unit 200 adopts IGCT both end voltage direct measurement mode, precise control, zero-crossing examination and control not
Affected by harmonic voltage, electric current, frequency and condenser voltage discharge and recharge, stable and reliable in work.Further, temperature detecting unit
500 pass through to detect thyristor module temperature conditionss, control cooling fan to start, and the timely cutoff thyristor when IGCT is overheated
Module, protection thyristor module and other equipment are not damaged by.And insulating power supply unit 800 enters using in AC and driving side
The double isolation of row, it is possible to increase the reliability of circuit, is prevented effectively from and is only isolated in low-voltage direct side and isolating device is occurred
The Failure risk of over-voltage breakdown.
The foregoing is only preferred embodiment of the present utility model, not in order to limit this utility model, all this
Any modification, equivalent and improvement made within the spirit of utility model and principle etc., should be included in this utility model
Protection domain within.
Claims (10)
1. a kind of zero cross fired control circuit of anti-parallel thyristor split-phase switched capacitor is it is characterised in that inclusion input is defeated
Go out signal phototube coupling unit, control process unit, zero passage detection unit and drive isolated location；Described control process unit divides
It is not connected with described input/output signal phototube coupling unit, described zero passage detection unit and described driving isolated location；
Described input/output signal phototube coupling unit, for low level control signal is generated according to external control signal, concurrently
Give described control process unit；
Described zero passage detection unit, whether the voltage for detecting IGCT two ends is equal, and is sent to described control process list
Unit；
Described control process unit, the whether equal signal of the voltage for receiving described IGCT two ends and described low level control
Signal processed, according to the whether equal signal of the voltage at described IGCT two ends and described low level control signal generate and control
The drive signal that IGCT starts, or control the stop signal of described IGCT closing, it is sent to described driving isolated location；
Described driving isolated location, for driving described IGCT zero cross fired according to described drive signal, and according to described
Stop signal stops driving the zero cross fired of described IGCT.
2. the zero cross fired control circuit of anti-parallel thyristor split-phase switched capacitor according to claim 1, its feature
It is, also include temperature detecting unit and air-blower control unit；Described temperature detecting unit and described air-blower control unit all with
Described control process unit connects；
Described temperature detecting unit, for detecting the Current Temperatures of described IGCT, and described Current Temperatures are sent to described control
Processing unit processed；
Described control process unit, is additionally operable to receive described Current Temperatures, and is higher than to reach the first default temperature in described Current Temperatures
When spending, generate air-blower control signal；And the described IGCT of control is generated when described Current Temperatures are higher than the second preset temperature
The stop signal closed；
Described air-blower control unit is used for controlling cooling fan work corresponding with described IGCT according to described air-blower control signal
Make；
Wherein, described second preset temperature is more than described first preset temperature.
3. the zero cross fired control circuit of anti-parallel thyristor split-phase switched capacitor according to claim 2, its feature
It is, described air-blower control unit includes control relay, the first fly-wheel diode and filter capacitor；Described control relay
Negative pole is electrically connected with described output input signal Phototube Coupling unit, and the positive pole of described control relay connects the first external electricity
Source, the normally opened node of output of described control relay connects the second external power supply, is that described cooling fan is powered；
Described first fly-wheel diode inverse parallel is at the two ends of described control relay；
Described filter capacitor be connected in parallel on described control relay export normally opened node and described second external power supply n pole it
Between.
4. the zero cross fired control circuit of anti-parallel thyristor split-phase switched capacitor according to claim 2, its feature
It is, described temperature detecting unit includes temperature sensing circuit, the first temperature switch protection circuit and second temperature switch protection
Circuit；Described temperature sensing circuit, described first temperature switch protection circuit and described second temperature switch protecting circuit all with
Described control process unit connects；
Described temperature sensing circuit, for detecting the temperature of described IGCT；
Described first temperature switch protection circuit, for described IGCT temperature be higher than described first preset temperature when, to
Described control process unit sends the first signal；Described control process unit air-blower control according to described first signal generation
Signal；
Described second temperature switch protecting circuit, for described IGCT temperature be higher than described second preset temperature when, to
Described control process unit sends secondary signal；Described control process unit generates according to described secondary signal and controls described crystalline substance lock
The stop signal that pipe is closed.
5. the zero cross fired control circuit of anti-parallel thyristor split-phase switched capacitor according to claim 1, its feature
It is, also include display unit and insulating power supply unit；Described display unit is connected with described control process unit；Described isolation
Power subsystem is described control process unit and described display unit is powered；
Described control process unit is additionally operable to when generating the stop signal controlling described IGCT closing, to described display unit
Send fault message；Described display unit, for showing described fault message；
Described insulating power supply unit include the first isolating transformer, the first diode single-phase rectification bridge, three rectify Voltagre regulators,
Light emitting diode and first resistor；The primary side of described first isolating transformer is electrically connected with the 6th external power supply, and described first
The secondary side of isolating transformer is connected with the ac input end of described first diode single-phase rectification bridge；Described first diode list
The input that the positive pole of the DC output end of commutating phase bridge rectifies Voltagre regulator with described three electrically connects, described first diode
The earth terminal that the negative pole of the DC output end of single-phase rectification bridge rectifies Voltagre regulator with described three electrically connects；Described light-emitting diodes
Pipe is connected with described first resistor, and the light emitting diode after series connection and first resistor are connected in parallel on described three and rectify Voltagre regulator
Between earth terminal and outfan.
6. the zero cross fired control circuit of anti-parallel thyristor split-phase switched capacitor according to claim 5, its feature
It is, described insulating power supply unit also includes short-circuit protection fuse, the first flat wave capacitor, the first storage capacitor, the second flat ripple
Electric capacity and the second storage capacitor；
The primary side of described first isolating transformer is electrically connected with described 6th external power supply by described short-circuit protection fuse；
Described first flat wave capacitor and described first storage capacitor are in parallel, and entirety is connected in parallel on described first diode single-phase rectifier
Between the positive pole of bridge and negative pole；
Described second flat wave capacitor and described second storage capacitor are in parallel, and entirety is connected in parallel on described three and rectifies Voltagre regulators
Between output and ground.
7. the zero cross fired control circuit of anti-parallel thyristor split-phase switched capacitor according to claim 1, its feature
Be, described input/output signal phototube coupling unit include more than one input signal photoelectric isolating circuit and more than one
Output signal photoelectric isolating circuit；
Each described input signal photoelectric isolating circuit all includes the first photo-coupler and the 4th pull-up resistor；Described first optocoupler
First pin of clutch is connected with the positive pole of the 7th external power supply, and second pin receives external control signal, and the 3rd pin is grounded,
4th pin is electrically connected with described control process unit, and is electrically connected with the 8th external power supply by the 4th pull-up resistor；
Each described output signal photoelectric isolating circuit all includes the second photo-coupler and the 5th pull-up resistor；Described second optocoupler
First pin of clutch is connected with described 8th external power supply by described 5th pull-up resistor, at second pin and described control
Reason unit connects, and the 3rd pin is connected with the negative pole of described 7th external power supply, the 4th pin outputs level signals.
8. the zero cross fired control circuit of anti-parallel thyristor split-phase switched capacitor according to claim 1, its feature
It is, described zero passage detection unit includes more than one zero cross detection circuit；The corresponding detection of each described zero cross detection circuit
One phase voltage at described IGCT two ends；Each described zero cross detection circuit all includes the 3rd photo-coupler, audion and partial pressure
Current-limiting resistance；Described IGCT includes two the first IGCTs in parallel and the second IGCT；
First pin of described 3rd photo-coupler is electrically connected with described IGCT by the 6th pull-up resistor, second pin and institute
State the colelctor electrode electrical connection of audion, the 4th pin is electrically connected with described control process unit；The base stage of described audion and institute
State current-limiting resistor voltage divider electrical connection；
The emitter-base bandgap grading of described audion is used for electrically connecting with the k pole of described first IGCT；
The other end of described current-limiting resistor voltage divider is used for electrically connecting with the k pole of described second IGCT.
9. the zero cross fired control circuit of anti-parallel thyristor split-phase switched capacitor according to claim 8, its feature
It is, described zero cross detection circuit also includes resistance capaciting absorpting circuit and the second fly-wheel diode；Described resistance capaciting absorpting circuit and institute
State the second fly-wheel diode in parallel；
Described resistance capaciting absorpting circuit is connected in parallel between base stage and the emitter stage of described audion；
Described second fly-wheel diode is connected in parallel between base stage and the emitter stage of described audion, and described second fly-wheel diode
Positive pole electrically connect with the emitter stage of described audion, the base stage electricity of the negative pole of described second fly-wheel diode and described audion
Connect.
10. the zero cross fired control circuit of anti-parallel thyristor split-phase switched capacitor according to claim 8, its feature
It is, described driving isolated location includes more than one driving isolation circuit；Each described driving isolation circuit corresponds to one
Described zero cross detection circuit；
Each described driving isolation circuit all includes the second isolating transformer, the second diode single-phase rectification bridge, power switch pipe
With the 4th photo-coupler；
The primary side of described second isolating transformer is electrically connected with the 9th external power supply, and secondary side is single-phase with described second diode
The ac input end of rectifier bridge connects；
The described positive pole of DC output end of the second diode single-phase rectification bridge is electrically connected with the s pole of described power switch, negative pole
Electrically connect with the d pole of described power switch；
First pin of described 4th photo-coupler connects the tenth external power supply, and second pin is electrically connected with control process unit, the
Three pins are electrically connected with the d pole of described power switch, and the 4th pin is electrically connected with the g pole of described power switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620514065.2U CN205921388U (en) | 2016-05-31 | 2016-05-31 | Inverse parallel thyristor phase separating switched capacitor's zero passage triggers control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620514065.2U CN205921388U (en) | 2016-05-31 | 2016-05-31 | Inverse parallel thyristor phase separating switched capacitor's zero passage triggers control circuit |
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| Publication Number | Publication Date |
|---|---|
| CN205921388U true CN205921388U (en) | 2017-02-01 |
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|---|---|---|---|
| CN201620514065.2U Expired - Fee Related CN205921388U (en) | 2016-05-31 | 2016-05-31 | Inverse parallel thyristor phase separating switched capacitor's zero passage triggers control circuit |
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| CN (1) | CN205921388U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105896563A (en) * | 2016-05-31 | 2016-08-24 | 廊坊英博电气有限公司 | Zero-crossing trigger control circuit for anti-parallel thyristor split-phase switched capacitor |
| CN107395184A (en) * | 2017-08-28 | 2017-11-24 | 武汉华海通用电气有限公司 | One kind monitors integrated diode array driving power soft switch circuit |
-
2016
- 2016-05-31 CN CN201620514065.2U patent/CN205921388U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105896563A (en) * | 2016-05-31 | 2016-08-24 | 廊坊英博电气有限公司 | Zero-crossing trigger control circuit for anti-parallel thyristor split-phase switched capacitor |
| CN107395184A (en) * | 2017-08-28 | 2017-11-24 | 武汉华海通用电气有限公司 | One kind monitors integrated diode array driving power soft switch circuit |
| CN107395184B (en) * | 2017-08-28 | 2023-10-27 | 武汉华海通用电气有限公司 | Monitoring integrated diode array driving power soft switching circuit |
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