CN203774796U - Thyristor equal voltage switching trigger circuit - Google Patents
Thyristor equal voltage switching trigger circuit Download PDFInfo
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- CN203774796U CN203774796U CN201420104363.5U CN201420104363U CN203774796U CN 203774796 U CN203774796 U CN 203774796U CN 201420104363 U CN201420104363 U CN 201420104363U CN 203774796 U CN203774796 U CN 203774796U
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Abstract
The utility model discloses a thyristor equal voltage switching trigger circuit. The thyristor equal voltage switching trigger circuit is composed of a zero cross detection circuit, a switching control protection circuit, a signal sequence processing circuit, a driving isolation circuit, a peripheral power supply circuit, etc. During triggering and conduction of thyristors, the zero cross detection circuit is utilized to detect voltages at two ends of a switch of each thyristor, trigger pulse is produced for the C phase thyristor and the A phase thyristor on the basis of sequence requirements via the switching control protection circuit when the voltages at two ends of each thyristor are equal, triggering and conduction of the thyristors are realized through signal sequence processing circuit and the driving isolation circuit, and the A phase thyristor and the C phase thyristor are cut off by adopting corresponding control sequences. The trigger circuit helps to ensure equal voltage trigger of thyristors and is short in transient process, the trigger response time is less than 20ms, no inrush current exists in the trigger process, and reverse cut-off voltages are relatively low, so that reliable trigger of thyristors in the reactive dynamic compensation field is ensured.
Description
Technical field
The utility model has related to reactive power compensation and power quality controlling field, has related in particular to the isobaric switching circuits for triggering of a kind of thyristor.
Background technology
Along with the development of economy and technical merit, the continuous increase of network load, not only change network configuration and the power distribution of electric power system, and caused the reactive power distribution of system unreasonable, even may occur generally lower situation of the idle wretched insufficiency in some areas, voltage levvl.In addition, the reduction of power factor and voltage will make electric equipment be not fully utilized, and reduce network capacity, and cause that loss increases.Simultaneously due to the increase of the equipment of capacity, impact, nonlinear-load greatly such as arc furnace, large-sized rolling mills, voltage and the current harmonic content of electrical network are increased, worsen grid supply quality, even cause original Shunt Capacitor Unit and network system generation resonance, affect the safe and stable operation of system, therefore must adopt corresponding filtering compensation technology to realize the system of reactive power compensation and harmonic wave inhibition, thereby solve the deficiencies in the prior art.
In power system reactive power compensation, modal compensation equipment is thyristor switchable capacitor (TSC) at present, and it is mainly to be developed by fixed capacity compensation, belongs to parallel connection type compensation equipment.In thyristor switchable capacitor device, the design of thuristor throw-in and throw-off circuits for triggering is one of them important step, these circuits for triggering should ensure to produce trigger impulse when building-out capacitor voltage is consistent with line voltage and make thyristor conducting, now the voltage at thyristor two ends equates, electric capacity is now connected to the grid and can not produces and shove, otherwise, because can causing serious input, the unexpected variation of building-out capacitor voltage shoves, under extreme case, input is shoved and can be made building-out capacitor damage, and affects the reliably working of equipment.The zero cross fired chip of the MOC308 × series of at present more use MOTOROLA company carries out thyristor triggering, due to the effect of series reactor in thyristor switchable capacitor group, in the time that turn-offing, thyristor can produce larger reverse voltage (this magnitude of voltage can be greater than 1000V), the the highest withstand voltage of MOC308 × family device is 800V, the use so these zero cross fired chips need to be connected in the time of work, like this because the problem of the parameter consistency of different chips can cause series average-voltage problem, affect greatly the reliability of circuits for triggering, also affected the functional reliability of thyristor switchable capacitor group.Therefore, need to study a kind of thyristor gating circuit that can be applied in reactive-load dynamic compensation field, and ensure the opening-closing capacitor bank of isobaric no-flashy-flow, the switching response time should be less than 20ms.
Summary of the invention
For the deficiencies in the prior art, the purpose of this utility model is just to provide a kind of thyristor isobaric switching circuits for triggering, by zero cross detection circuit, thyristor both end voltage is detected, under the control of AT89C2051 single-chip microcomputer, after isolated drive circuit, realize the isobaric switching to thyristor, and signal sequence is designed separately to treatment circuit, thereby and be equipped with peripheral power supply circuit and ensure the reliably working of these circuits for triggering.
In order to realize above-mentioned object, the technical solution of the utility model is: the isobaric switching circuits for triggering of a kind of thyristor, by zero cross detection circuit, switching control protection electric circuit, signal sequence treatment circuit, driving isolation circuit and peripheral power supply the electric circuit constitute, described zero cross detection circuit comprises A phase thyristor switch zero cross detection circuit and C phase thyristor switch zero cross detection circuit, and be connected in switching control protection electric circuit, this switching control protection electric circuit comprises external control signal input circuit, AT89C2051 single chip circuit and MAX813L circuit, by input external control order, the zero passage detection signal that the low level control signal that described external control signal input circuit is produced and described zero cross detection circuit produce transfers to described AT89C2051 single chip circuit, this AT89C2051 single chip circuit is exported two groups and is spaced apart the low and high level pulse of 160us as the driving signal of A phase and C phase thyristor switch, described driving signal transfers to the signal sequence treatment circuit that is connected in switching control protection electric circuit, after carrying out sequential processing, signal sequence treatment circuit transfers to driving isolation circuit, and producing A phase and C phase thyristor switch driving triggering signal, described peripheral power supply circuit is connected to switching control protection electric circuit and driving isolation circuit.
As a kind of preferred version, an input of described A phase thyristor switch zero cross detection circuit is connected in the upper linker K2 of A phase thyristor switch, after 6 resistance series connection, be connected with the ac input end I1 that is formed rectifier by 4 1N4007 rectifier diodes, another ac input end I2 of this rectifier is connected in the bottom link K1 of A phase thyristor switch, the DC output end Q1 of this rectifier, Q2 is connected to 1 pin and 2 pin of MOC8050 photoelectrical coupler, 5 pin of described MOC8050 photoelectrical coupler are connected to positive source through pull-up resistor, 4 pin ground connection of MOC8050 photoelectrical coupler, 5 pin of described MOC8050 photoelectrical coupler transfer to 12 pin and 18 pin of AT89C2051 single-chip microcomputer, described C phase zero cross detection circuit is identical with the composition of A phase zero cross detection circuit, and 5 pin of the MOC8050 photoelectrical coupler of C phase zero cross detection circuit transfer to 13 pin and 19 pin of AT89C2051 single-chip microcomputer.
As a kind of preferred version, the external control signal of described external control signal input circuit is connected to 1 pin of TLP521 optocoupler after resistance and filter capacitor, 2 pin of described TLP521 optocoupler are connected to the common port of external control signal, 3 pin ground connection of TLP521 optocoupler, 4 pin of TLP521 optocoupler are connected to 5V power supply through pull-up resistor, 4 pin of TLP521 optocoupler are connected to 2 pin of AT89C2051 single-chip microcomputer, produce the trigger impulse of thyristor for control single chip computer; Described AT89C2051 single chip circuit a low level of 3 pin outputs, and light the LED light-emitting diode that 3 pin connect, this diode process resistance is to power supply, 4 pin of described AT89C2051 single-chip microcomputer and 5 pin connect the crystal oscillator of 24M, 1 pin of AT89C2051 single-chip microcomputer connects the power-on reset signal of the rc reset circuit generation being made up of resistance and electric capacity, simultaneously 1 pin of AT89C2051 single-chip microcomputer is also connected with 7 pin of the MAX813L reset chip of described MAX813L circuit, and 12 pin of AT89C2051 single-chip microcomputer are connected to 6 pin of MAX813L reset chip.
As a kind of preferred version, described signal sequence treatment circuit is by 74HC00, 74HC32 and resistance capacitance composition, 1 pin of described 74HC00 is connected to 2 pin of AT89C2051 single-chip microcomputer, and this signal is connected to after resistance and electric capacity capacitance-resistance filter to 2 pin of 74HC00, 3 pin of 74HC00 are connected to 1 pin and 4 pin of 74HC32, 8 pin of described AT89C2051 single-chip microcomputer, the pulse signal that 9 pin produce is delivered to 2 pin and 5 pin of 74HC32, the reset signal of the reset circuit being made up of resistance and electric capacity is connected to 12 pin and 10 pin of 74HC32, 3 pin of described 74HC32 are connected to 13 pin of 74HC32, 6 pin of 74HC32 are connected to 9 pin of 74HC32, 11 pin of 74HC32 and 8 pin are respectively as the triggering signal of A phase and C phase.
As a kind of preferred version, described driving isolation circuit comprises CNY17F-2 opto-coupler chip, IRF640 device, isolation drive transformer and peripheral circuit, using 11 pin of 74HC32 in described signal sequence treatment circuit and 8 pin respectively as the triggering signal of A phase and C phase, this triggering signal is after two CNY17F-2 high speed photo coupling isolation, produce the driving signal of two MOSFET as power amplifying device via two MOSFET pipes (IRF640), 1 pin of described IRF640 connects the driving signal through the isolation of CNY17F-2 high speed photo coupling, 3 pin of IRF640 are connected to the ground of 12V, 2 pin of IRF640 are connected on the former limit winding of isolation drive transformer, the other end of former limit winding is connected to 12V power supply, be parallel with the voltage stabilizing didoe of 12V and 1N4007 diode at the two ends of former limit winding for reverse afterflow, described isolation drive transformer two secondary windings that become be serially connected with respectively 1N4007 diode, the 1N4007 diode of absorption resistance and Absorption Capacitance and oppositely afterflow effect is connected to output simultaneously, this output is connected to respectively gate pole and the negative electrode of thyristor, described C phase driving isolation circuit is identical with A phase driving isolation circuit.
As a kind of preferred version, described peripheral power supply circuit is made up of LH10-10B12 modular power source and IB1205S2W insulating power supply module, the upper end of A phase thyristor switch and system zero line are connected to respectively to live wire and the zero line of LH10-10B12 modular power source 220V input, LH10-10B12 output can produce the power supply of 12V, the ground (AGBD) of 12V power supply and 12V power supply is connected to respectively to 1 pin and 2 pin of IB1205S2W simultaneously, 6 pin of IB1205S2W and 4 pin can produce the ground (GND) of working power and the 5V working power of 5V, simultaneously for these circuits for triggering provide 12V and AGND, two groups of working powers of 5V and GND.
The beneficial effects of the utility model: ensure the equipressure of thyristor to trigger, transient process is short, and the triggering response time is less than 20ms, trigger process no-flashy-flow and reverse shutoff voltage are less, thereby have ensured the reliable triggering of the thyristor in reactive-load dynamic compensation field.
Brief description of the drawings
Fig. 1 is the system configuration schematic diagram of the isobaric switching circuits for triggering of thyristor;
Fig. 2 is A phase zero cross detection circuit schematic diagram;
Fig. 3 is for being external control signal input circuit schematic diagram;
Fig. 4 is AT89C2051 single chip circuit schematic diagram;
Fig. 5 is MAX813L circuit diagram;
Fig. 6 is signal sequence treatment circuit schematic diagram one;
Fig. 7 is signal sequence treatment circuit schematic diagram two;
Fig. 8 is A phase driving isolation circuit diagram one;
Fig. 9 is A phase driving isolation circuit diagram two;
Figure 10 is peripheral power supply circuit diagram one;
Figure 11 is peripheral power supply circuit diagram two;
Description of reference numerals: zero cross detection circuit 1, switching control protection electric circuit 2, signal sequence treatment circuit 3, driving isolation circuit 4 and peripheral power supply circuit 5, A phase zero cross detection circuit 1-1, C phase zero cross detection circuit 1-2, external control signal input circuit 2-1, AT89C2051 single chip circuit 2-2, MAX813L circuit 2-3, A phase driving isolation circuit 4-1, C phase driving isolation circuit 4-2.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is further described.
Embodiment: Fig. 1 is the system configuration schematic diagram of the isobaric switching circuits for triggering of thyristor, the isobaric switching circuits for triggering of described thyristor are by zero cross detection circuit 1, switching control protection electric circuit 2, signal sequence treatment circuit 3, driving isolation circuit 4 and peripheral power supply circuit 5 form, described zero cross detection circuit 1 comprises A phase zero cross detection circuit 1-1 and C phase zero cross detection circuit 1-2, and be connected in switching control protection electric circuit 2, this switching control protection electric circuit 2 comprises external control signal input circuit 2-1, AT89C2051 single chip circuit 2-2 and MAX813L circuit 2-3, by input external control order, the zero passage detection signal that the low level control signal that described external control signal input circuit 2-1 is produced and described zero cross detection circuit 1 produce transfers to described AT89C2051 single chip circuit 2-2, this AT89C2051 single chip circuit 2-2 exports two groups and is spaced apart the low and high level pulse of 160us as the driving signal of A phase and C phase thyristor switch, described driving signal transfers to the signal sequence treatment circuit 3 that is connected in switching control protection electric circuit 2, after carrying out sequential processing, signal sequence treatment circuit 3 transfers to driving isolation circuit 4, and producing A phase and C phase thyristor switch driving triggering signal, described peripheral power supply circuit 5 is connected to switching control protection electric circuit 2 and driving isolation circuit 4.Fig. 2 is A phase zero cross detection circuit schematic diagram, an input of described A phase zero cross detection circuit is connected in the upper linker K2 of A phase thyristor switch, after 6 resistance series connection, be connected with the ac input end I1 that is formed rectifier by 4 1N4007 rectifier diodes, another ac input end I2 of this rectifier is connected in the bottom link K1 of A phase thyristor switch, the DC output end Q1 of this rectifier, Q2 is connected to 1 pin and 2 pin of MOC8050 photoelectrical coupler, 5 pin of described MOC8050 photoelectrical coupler are connected to positive source through pull-up resistor, 4 pin ground connection of MOC8050 photoelectrical coupler, in the time that the voltage at thyristor two ends equates, a 5V high level signal of 5 pin outputs of MOC8050 photoelectrical coupler, in the time that thyristor both end voltage is unequal, 5 pin output 0V low level signals of MOC8050 photoelectrical coupler, 5 pin of described MOC8050 photoelectrical coupler transfer to 12 pin and 18 pin of AT89C2051 single-chip microcomputer, described C phase zero cross detection circuit 1-2 is identical with the composition of A phase zero cross detection circuit 1-1, and 5 pin of the MOC8050 photoelectrical coupler of C phase zero cross detection circuit 1-2 transfer to 13 pin and 19 pin of AT89C2051 single-chip microcomputer.Single chip computer AT 89C2051 just can detect A phase and C phase thyristor both end voltage like this.As shown in Fig. 3, Fig. 4, Fig. 5, switching control protection electric circuit 2 is made up of external control signal input circuit 2-1, AT89C2051 single chip circuit 2-2, MAX813L circuit 2-3.Wherein, external control signal is connected to 1 pin of TLP521 optocoupler after resistance and filter capacitor, 2 pin of TLP521 optocoupler are connected to the common port of external control signal, 3 pin ground connection of TLP521 optocoupler, 4 pin of TLP521 optocoupler are connected to 5V power supply through pull-up resistor, and in the time that there is the control signal of controlling thyristor conducting outside, 4 pin of TLP521 optocoupler are 0V low level, otherwise this pin is 5V high level.4 pin of TLP521 optocoupler are delivered to 2 pin of AT89C2051 single-chip microcomputer, produced the trigger impulse of thyristor in order to control single chip computer.AT89C2051 single chip circuit 2-2 is the control core of these circuits for triggering, 12 pin of this single chip circuit, 18 pin and 13 pin and 19 pin can detect the both end voltage of A phase and C phase thyristor switch respectively, in the time that 2 pin of single-chip microcomputer detect low level signal, represent the outside control command that drops into thyristor that has, then in the time that 13 pin of AT89C2051 single-chip microcomputer and 19 pin are high level (when C phase thyristor both end voltage equates), the low and high level pulse that can be 160us at 9 pin output gaps of AT89C2051 single-chip microcomputer, high level and low level respectively account for 80us.Then, by judging whether whether the output signal of C phase zero cross detection circuit 1-2 be always high level and detect the reliably triggering of C phase.On the basis of reliably triggering mutually at C, in the time that 12 pin of AT89C2051 single-chip microcomputer and 18 pin are high level (when A phase thyristor both end voltage equates), the low and high level pulse that can be 160us at 8 pin output gaps of AT89C2051 single-chip microcomputer, high level and low level respectively account for 80us.Then, by judging whether whether the output signal of A phase zero cross detection circuit 1-1 be always high level and detect the reliably triggering of A phase, if the output signal of A phase zero cross detection circuit 1-1 is always high level, this trigger process completes, now, 8 pin of AT89C2051 single-chip microcomputer, 9 pin can continue the low and high level pulse that output gap is 160us, until 2 pin of AT89C2051 single-chip microcomputer just can stop exporting low and high level pulse while being high level, otherwise, stop producing low and high level pulse, and generation triggers rub-out signal, and export a low level at 3 pin of AT89C2051 single-chip microcomputer, and light the LED light-emitting diode that 3 pin connect and realize alarm.4 pin of AT89C2051 single-chip microcomputer and 5 pin connect the crystal oscillator of 24M, 1 pin of AT89C2051 single-chip microcomputer connects the power-on reset signal of the rc reset circuit generation being made up of resistance and electric capacity, simultaneously 1 pin of AT89C2051 single-chip microcomputer also with 7 pin of MAX813L reset chip, 12 pin of AT89C2051 single-chip microcomputer are connected to 6 pin of MAX813L reset chip, in Single Chip Microcomputer (SCM) program every 1ms, can allow 12 pin level states of AT89C2051 single-chip microcomputer overturn, realize the zero clearing to timer in MAX813L reset chip, when program is interfered or when operation exception, 12 pin a period of times of AT89C2051 single-chip microcomputer do not have level upset, so the sector-meeting of MAX813L reset coil produces the reset signal of high level automatically, make AT89C2051 monolithic processor resetting, so just ensure the functional reliability of these circuits for triggering.As Fig. 6, shown in Fig. 7, signal sequence treatment circuit 3 is by 74HC00(NAND gate), 74HC32(or door) and the circuit of resistance capacitance composition form, this signal sequence treatment circuit 3 mainly may cause the problem of thyristor false triggering to be processed to the variation that can cause AT89C2051 single-chip microcomputer pin level in the time that control circuit powers on, 1 pin of 74HC00 is connected to 2 pin of AT89C2051 single-chip microcomputer, and this signal is connected to after a resistance and electric capacity capacitance-resistance filter to 2 pin of 74HC00, like this when this circuits for triggering one powered on moment, 3 pin of 74HC00 remain high level, so just can not produce and produce wrong trigger impulse because the level of powered on moment changes, 3 pin of 74HC00 are connected to 1 pin and 4 pin of 74HC32, 8 pin of AT89C2051 single-chip microcomputer, the pulse signal that 9 pin produce is delivered to 2 pin and 5 pin of 74HC32, the reset signal of the reset circuit being made up of resistance and electric capacity is connected to 12 pin and 10 pin of 74HC32, 3 pin of 74HC32 are connected to 13 pin of 74HC32, 6 pin of 74HC32 are connected to 9 pin of 74HC32, 11 pin of 74HC32 and 8 pin are respectively as the triggering signal of A phase and C phase, like this in the time of single-chip microcomputer electrification reset, 11 pin and 8 pin of 74HC32 are always high level, can not cause because of the level translation of single-chip microcomputer output signal the false triggering of thyristor.As shown in Figure 8, Figure 9 using 11 pin of 74HC32 in signal sequence treatment circuit 3 and 8 pin respectively as the triggering signal of A phase and C phase, after two CNY17F-2 high speed photo coupling isolation, produce the driving signal of two MOSFET, two MOSFET pipes (IRF640) are as power amplifying device.1 pin of IRF640 connects the driving signal through the isolation of CNY17F-2 high speed photo coupling, 3 pin of IRF640 are connected to the ground of 12V, 2 pin of IRF640 are connected on the former limit winding of isolation drive transformer, the other end of former limit winding is connected to 12V power supply, be parallel with voltage stabilizing didoe and the 1N4007 diode (playing reverse afterflow effect) of 12V at the two ends of former limit winding, isolation drive transformer two secondary windings that become be serially connected with respectively 1N4007 diode, the 1N4007 diode of absorption resistance and Absorption Capacitance and oppositely afterflow effect is connected to output simultaneously, this output is connected to respectively gate pole and the negative electrode of thyristor.So just realize the isolation of thyristor is triggered and driven.As Figure 10, shown in Figure 11, in order to provide working power to this drive circuit, in the present invention, design peripheral power supply circuit 5, this power circuit is made up of LH10-10B12 modular power source and IB1205S2W insulating power supply module, the upper end of A phase thyristor switch and system zero line are connected to respectively to live wire and the zero line of the 220V input of LH10-10B12, LH10-10B12 output can produce the power supply of 12V, the ground (AGBD) of 12V power supply and 12V power supply is connected to respectively to 1 pin and 2 pin of IB1205S2W simultaneously, IB1205S2W6 pin and 4 pin can produce the ground (GND) of working power and the 5V working power of 5V, so just for these circuits for triggering provide 12V and AGND, two groups of working powers of 5V and GND, ensure the reliably working of these circuits for triggering.When concrete enforcement, this circuit designs mainly for the circuits for triggering of thuristor throw-in and throw-off compensation condenser, in the time that external control signal input circuit 2-1 detects that control command is effective, the zero cross signal of C phase can be detected by C phase zero cross detection circuit 1-2, in the time of C phase voltage zero passage, this phase thyristor both end voltage equates, now can be produced by AT89C2051 single chip circuit 2-2 the triggering signal of C phase, triggering signal is carried out after time delay and waveform processing through signal sequence treatment circuit 3, produce the trigger impulse of C phase thyristor through C phase driving isolation circuit 4-2, if now triggered successfully, the zero passage detection module of C phase can detect useful signal all the time, then, when in the time that A phase thyristor both end voltage equates, A phase zero cross detection circuit 1-1 detects zero cross signal, single chip circuit can produce triggering signal, by signal sequence process and driving isolation after form the trigger impulse of A phase thyristor, under the effect of trigger impulse, A is conducted.If after C triggers mutually, the zero cross signal that can't detect C phase is effective all the time, judges that C phase thyristor damages, and protects shutdown.After external control signal input circuit 2-1 detects that external control order is invalid, can first stop A phase triggering signal, whether the zero cross signal that then detects A phase exists, because if A phase thyristor reliable turn-off, thyristor both end voltage is unequal, invalid when zero cross signal, wait like this A can tube to have no progeny mutually, then stop the triggering of C phase.In turn off process, due to the self character of thyristor, ensure to turn-off compensation branch road when electric current is zero.This sampler can ensure reliably to trigger when thyristor both end voltage is equal, and reliable turn-off when electric current is zero can ensure that the transient process of switching process is the shortest, switching no-flashy-flow, and when shutoff, reverse voltage is minimum.
Finally it should be noted that, above embodiment is the non-limiting technical scheme in order to the technical solution of the utility model to be described only, those of ordinary skill in the art is to be understood that, those are modified to the technical solution of the utility model or are equal to replacement, and do not depart from aim and the scope of the technical program, all should be encompassed in the middle of claim scope of the present utility model.
Claims (6)
1. the isobaric switching circuits for triggering of thyristor, it is characterized in that: the isobaric switching circuits for triggering of described thyristor are by zero cross detection circuit (1), switching control protection electric circuit (2), signal sequence treatment circuit (3), driving isolation circuit (4) and peripheral power supply circuit (5) composition, described zero cross detection circuit (1) comprises A phase zero cross detection circuit (1-1) and C phase zero cross detection circuit (1-2), and be connected in switching control protection electric circuit (2), this switching control protection electric circuit (2) comprises external control signal input circuit (2-1), AT89C2051 single chip circuit (2-2) and MAX813L circuit (2-3), by input external control order, the zero passage detection signal that the low level control signal that described external control signal input circuit (2-1) is produced and described zero cross detection circuit (1) produce transfers to described AT89C2051 single chip circuit (2-2), this AT89C2051 single chip circuit (2-2) is exported two groups and is spaced apart the low and high level pulse of 160us as the driving signal of A phase and C phase thyristor switch, described driving signal transfers to the signal sequence treatment circuit (3) that is connected in switching control protection electric circuit (2), after carrying out sequential processing, signal sequence treatment circuit (3) transfers to driving isolation circuit (4), and producing A phase and C phase thyristor switch driving triggering signal, described peripheral power supply circuit (5) is connected to switching control protection electric circuit (2) and driving isolation circuit (4).
2. the isobaric switching circuits for triggering of a kind of thyristor according to claim 1, it is characterized in that: an input of described A phase zero cross detection circuit (1-1) is connected in the upper linker K2 of A phase thyristor switch, after 6 resistance series connection, be connected with the ac input end I1 that is formed rectifier by 4 1N4007 rectifier diodes, another ac input end I2 of this rectifier is connected in the bottom link K1 of A phase thyristor switch, the DC output end Q1 of this rectifier, Q2 is connected to 1 pin and 2 pin of MOC8050 photoelectrical coupler, 5 pin of described MOC8050 photoelectrical coupler are connected to positive source through pull-up resistor, 4 pin ground connection of MOC8050 photoelectrical coupler, 5 pin of described MOC8050 photoelectrical coupler transfer to 12 pin and 18 pin of AT89C2051 single-chip microcomputer, described C phase zero cross detection circuit (1-2) is identical with the composition of A phase zero cross detection circuit (1-1), and 5 pin of the MOC8050 photoelectrical coupler of C phase zero cross detection circuit (1-2) transfer to 13 pin and 19 pin of AT89C2051 single-chip microcomputer.
3. the isobaric switching circuits for triggering of a kind of thyristor according to claim 1, it is characterized in that: the external control signal of described external control signal input circuit (2-1) is connected to 1 pin of TLP521 optocoupler after resistance and filter capacitor, 2 pin of described TLP521 optocoupler are connected to the common port of external control signal, 3 pin ground connection of TLP521 optocoupler, 4 pin of TLP521 optocoupler are connected to 5V power supply through pull-up resistor, 4 pin of TLP521 optocoupler are connected to 2 pin of AT89C2051 single-chip microcomputer, produce the trigger impulse of thyristor for control single chip computer; Described AT89C2051 single chip circuit (2-2) a low level of 3 pin outputs, and light the LED light-emitting diode that 3 pin connect, this diode process resistance is to power supply, 4 pin of described AT89C2051 single-chip microcomputer and 5 pin connect the crystal oscillator of 24M, 1 pin of AT89C2051 single-chip microcomputer connects the power-on reset signal of the rc reset circuit generation being made up of resistance and electric capacity, simultaneously 1 pin of AT89C2051 single-chip microcomputer is also connected with 7 pin of the MAX813L reset chip of described MAX813L circuit (2-3), and 12 pin of AT89C2051 single-chip microcomputer are connected to 6 pin of MAX813L reset chip.
4. the isobaric switching circuits for triggering of a kind of thyristor according to claim 1, it is characterized in that: described signal sequence treatment circuit (3) is by 74HC00, 74HC32 and resistance capacitance composition, 1 pin of described 74HC00 is connected to 2 pin of AT89C2051 single-chip microcomputer, and this signal is connected to after resistance and electric capacity capacitance-resistance filter to 2 pin of 74HC00, 3 pin of 74HC00 are connected to 1 pin and 4 pin of 74HC32, 8 pin of described AT89C2051 single-chip microcomputer, the pulse signal that 9 pin produce is delivered to 2 pin and 5 pin of 74HC32, the reset signal of the reset circuit being made up of resistance and electric capacity is connected to 12 pin and 10 pin of 74HC32, 3 pin of described 74HC32 are connected to 13 pin of 74HC32, 6 pin of 74HC32 are connected to 9 pin of 74HC32, 11 pin of 74HC32 and 8 pin are respectively as the triggering signal of A phase and C phase.
5. the isobaric switching circuits for triggering of a kind of thyristor according to claim 1, it is characterized in that: described driving isolation circuit (4) comprises CNY17F-2 opto-coupler chip, IRF640 device, isolation drive transformer and peripheral circuit, using 11 pin of 74HC32 in described signal sequence treatment circuit (3) and 8 pin respectively as the triggering signal of A phase and C phase, this triggering signal is after two CNY17F-2 high speed photo coupling isolation, via two MOSFET pipes, the model of described MOSFET pipe is IRF640, produce the driving signal of two MOSFET as power amplifying device, 1 pin of described IRF640 connects the driving signal through the isolation of CNY17F-2 high speed photo coupling, 3 pin of IRF640 are connected to the ground of 12V, 2 pin of IRF640 are connected on the former limit winding of isolation drive transformer, the other end of former limit winding is connected to 12V power supply, be parallel with the voltage stabilizing didoe of 12V and 1N4007 diode at the two ends of former limit winding for reverse afterflow, described isolation drive transformer two secondary windings that become be serially connected with respectively 1N4007 diode, the 1N4007 diode of absorption resistance and Absorption Capacitance and oppositely afterflow effect is connected to output simultaneously, this output is connected to respectively gate pole and the negative electrode of thyristor, described C phase driving isolation circuit (4-2) is identical with A phase driving isolation circuit (4-1).
6. the isobaric switching circuits for triggering of a kind of thyristor according to claim 1, it is characterized in that: described peripheral power supply circuit (5) is made up of LH10-10B12 modular power source and IB1205S2W insulating power supply module, the upper end of A phase thyristor switch and system zero line are connected to respectively to live wire and the zero line of LH10-10B12 modular power source 220V input, LH10-10B12 output can produce the power supply of 12V, the ground (AGBD) of 12V power supply and 12V power supply is connected to respectively to 1 pin and 2 pin of IB1205S2W simultaneously, 6 pin of IB1205S2W and 4 pin can produce the ground (GND) of working power and the 5V working power of 5V, simultaneously for these circuits for triggering provide 12V and AGND, two groups of working powers of 5V and GND.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420104363.5U CN203774796U (en) | 2014-03-10 | 2014-03-10 | Thyristor equal voltage switching trigger circuit |
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| CN201420104363.5U CN203774796U (en) | 2014-03-10 | 2014-03-10 | Thyristor equal voltage switching trigger circuit |
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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 |
| CN115579886A (en) * | 2022-12-05 | 2023-01-06 | 中国电力科学研究院有限公司 | Method and device for quickly turning off thyristor |
-
2014
- 2014-03-10 CN CN201420104363.5U patent/CN203774796U/en not_active Expired - Fee Related
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 |
| CN115579886A (en) * | 2022-12-05 | 2023-01-06 | 中国电力科学研究院有限公司 | Method and device for quickly turning off thyristor |
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