CN106329891B - Trigger the pulse modulated circuit and method of thyristor - Google Patents
Trigger the pulse modulated circuit and method of thyristor Download PDFInfo
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- CN106329891B CN106329891B CN201610831914.1A CN201610831914A CN106329891B CN 106329891 B CN106329891 B CN 106329891B CN 201610831914 A CN201610831914 A CN 201610831914A CN 106329891 B CN106329891 B CN 106329891B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/06—Circuits specially adapted for rendering non-conductive gas discharge tubes or equivalent semiconductor devices, e.g. thyratrons, thyristors
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
Abstract
A kind of pulse modulated circuit triggering thyristor, comprising: impulse waveform generation circuit, modulated signal producing circuit and AND gate circuit.A method of triggering thyristor, comprising: establish impulse waveform generation circuit and modulated signal producing circuit；Pulse width modulated waveform is generated by impulse waveform generation circuit, and, pulse width modulating signal is generated by modulated signal producing circuit；Pulse width modulated waveform and pulse width modulating signal are subjected to logic and operation, generation obtains driving signal；Output drive signal is to thyristor to trigger thyristor.The pulse modulated circuit and method of above-mentioned triggering thyristor, the gate pole loss of the thyristor of driving chip can be greatly reduced while guaranteeing accurate Trigger Angle and trigger energy, that is, pulse operating time, the quality of pulse modulated circuit is improved, the circuit is simple and reliable and is easily achieved.
Description
Technical field
The present invention relates to trigger circuit technical fields, more particularly to a kind of pulse modulated circuit for triggering thyristor and side
Method.
Background technique
High voltage, high current and reliable and stable feature that thyristor can be born due to it and be widely used in electric power electricity
The fields such as son, motor control, high-power frequency conversion.In routinely application, generally by microcontroller such as DSP (at digital signal
Manage device, Digital Signal Processing), MCU (micro-control unit, Microcontroller Unit), FPGA it is (existing
Field programmable gate array, Field-Programmable Gate Array) etc. generations PWM (pulse width modulation, Pulse
Width Modulation) wave directly drives thyristor after level-one power amplification, so that turn on thyristors.
However, above-mentioned driving method has higher requirement to the performance with thyristor driver chip itself, due to driving
The full duty triggering within a triggering period of dynamic chip, when flowing through big driving chip electric current, long-play there is fever in circuit
The problem of even damaging, and then many adverse consequences such as motor is out of control, bridge circuit Shang Qiao and lower bridge simultaneously turn on are generated, no
It is able to satisfy the driving demand of circuit.
Summary of the invention
Based on this, it is necessary to the technical issues of for how to improve circuit quality, provide a kind of pulse for triggering thyristor
Modulation circuit and method.
It is a kind of trigger thyristor pulse modulated circuit, comprising: impulse waveform generation circuit, modulated signal producing circuit with
And AND gate circuit, the AND gate circuit connect with the impulse waveform generation circuit and the modulated signal producing circuit respectively
It connects；The impulse waveform generation circuit exports the pulse for generating pulse width modulated waveform, and to the AND gate circuit
Wide modulation waveform；The modulated signal producing circuit is used to generate pulse width modulating signal, and defeated to the AND gate circuit
The pulse width modulating signal out；The AND gate circuit is used for the pulse width modulated waveform and the pulse width tune
Signal processed carries out logic and operation to generate driving signal, and described to trigger for the driving signal to be output to thyristor
Thyristor.
The modulated signal producing circuit includes: the first self-oscillation circuit, the first frequency-selecting in one of the embodiments,
Circuit and the first filtering shaping circuit, first self-oscillation circuit is connect respectively with first frequency selection circuit and institute
The connection of the first filtering shaping circuit is stated, first frequency selection circuit is connect with first filtering shaping circuit, first filter
Wave shaping circuit is connect with the AND gate circuit；
First self-oscillation circuit is for respectively to first frequency selection circuit and first filter shape electricity
Road exports the first modulated pulse signal, and first frequency selection circuit is used to adjust the duty ratio of first modulated pulse signal,
The second modulated pulse signal is generated and exports, first filtering shaping circuit is used to export first self-oscillation circuit
First modulated pulse signal and first frequency selection circuit output second modulated pulse signal carry out shaping
Processing exports the pulse width modulating signal to the AND gate circuit to generate the pulse width modulating signal.
First self-oscillation circuit includes resistance R11, capacitor C11, phase inverter in one of the embodiments,
U11B, first frequency selection circuit include capacitor C12, resistance R12, first filtering shaping circuit include phase inverter U12B,
Phase inverter U13B and door U14A；One end of capacitor C11 is grounded, and the other end is connect with the input terminal of phase inverter U11B；Resistance R11
It is connect respectively with the input terminal of phase inverter U11B and output end；One end of capacitor C12 is connect with the output end of phase inverter U11B, separately
One end is connect with the input terminal of phase inverter U12B；One end of resistance R12 is connect with the input terminal of phase inverter U12B, another termination
Ground；The input terminal of phase inverter U13B is connect with the output end of phase inverter U12B, the output end of phase inverter U13B with door U14A's
Input terminal connection；The output end of phase inverter U11B is also connect with the input terminal of door U14A；With the output end of door U14A with it is described
The input terminal of AND gate circuit connects.
Phase inverter U12B and phase inverter U13B is schmitt inverter in one of the embodiments,.
The modulated signal producing circuit includes: the second self-oscillation circuit, the second frequency-selecting in one of the embodiments,
Circuit and the second filtering shaping circuit, second self-oscillation circuit are connect with second frequency selection circuit, and described second
Frequency selection circuit is connect with second filtering shaping circuit, and second filtering shaping circuit is connect with the AND gate circuit；
Second self-oscillation circuit exports the second modulated pulse signal, second choosing to second frequency selection circuit
Frequency circuit is used to adjust the duty ratio of second modulated pulse signal, generates and export the second modulated pulse signal, and described the
Second modulated pulse signal progress Shape correction that two filtering shaping circuits are used to export second frequency selection circuit with
The pulse width modulating signal is generated, and exports the pulse width modulating signal to the AND gate circuit.
Second self-oscillation circuit includes resistance R21, capacitor C21, phase inverter in one of the embodiments,
U21B, second frequency selection circuit include capacitor C22, resistance R22, second filtering shaping circuit include phase inverter U22B,
Phase inverter U23B；One end of capacitor C21 is grounded, and the other end is connect with the input terminal of phase inverter U21B；Resistance R21 respectively with reverse phase
The input terminal of device U21B is connected with output end；One end of capacitor C22 is connect with the output end of phase inverter U21B, the other end and reverse phase
The input terminal of device U22B connects；One end of resistance R22 is connect with the input terminal of phase inverter U22B, other end ground connection；Phase inverter
The input terminal of U23B is connect with the output end of phase inverter U22B, the input terminal of the output end of phase inverter U23B and the AND gate circuit
Connection.
Phase inverter U22B and phase inverter U23B is schmitt inverter in one of the embodiments,.
The impulse waveform generation circuit includes digital signal processor, micro-control unit in one of the embodiments,
Or field programmable gate array.
A method of triggering thyristor, comprising: establish impulse waveform generation circuit and modulated signal producing circuit；Pass through
The impulse waveform generation circuit generates pulse width modulated waveform, and, arteries and veins is generated by the modulated signal producing circuit
Rush bandwidth modulation signals；The pulse width modulated waveform and the pulse width modulating signal are subjected to logic and operation, it is raw
At obtaining driving signal；The driving signal is exported to thyristor to trigger the thyristor.
The output driving signal triggers the thyristor to thyristor in one of the embodiments, comprising:
Amplify the power of the driving signal；To the driving signal after the thyristor output power amplification with crystalline substance lock described in triggering and conducting
Pipe.
The pulse modulated circuit and method of above-mentioned triggering thyristor, impulse waveform generation circuit generate pulse width modulation wave
Shape, modulated signal producing circuit generate pulse width modulating signal, and AND gate circuit is by pulse width modulated waveform and pulse width
Modulated signal carries out logic and operation to generate driving signal, and to thyristor output driving signal, so that thyristor is triggered, it can
Know that the driving signal that generates after logic and operation is flash triggering, thyristor can be made sufficiently conductive, that improves trigger circuit can
By property, the crystalline substance of driving chip can be greatly reduced while guaranteeing accurate Trigger Angle and trigger energy, that is, pulse operating time
The gate pole of brake tube is lost, and improves the quality of pulse modulated circuit, the circuit is simple and reliable and is easily achieved.
Detailed description of the invention
Fig. 1 is the module diagram that the pulse modulated circuit of thyristor is triggered in one embodiment；
Fig. 1-2 is the module diagram that the pulse modulated circuit of thyristor is triggered in another embodiment；
Fig. 2 is the module diagram of modulated signal producing circuit in one embodiment；
Fig. 3 is the schematic illustration of modulated signal producing circuit in one embodiment；
Fig. 4 is the module diagram of modulated signal producing circuit in another embodiment；
Fig. 5 is the schematic illustration of modulated signal producing circuit in another embodiment；
Fig. 6 is the step schematic diagram that the method for thyristor is triggered in one embodiment.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing to the present invention
Specific embodiment be described in detail.Many details are explained in the following description in order to fully understand this hair
It is bright.But the invention can be embodied in many other ways as described herein, those skilled in the art can be not
Similar improvement is done in the case where violating intension of the present invention, therefore the present invention is not limited by the specific embodiments disclosed below.
Referring to Fig. 1, its module diagram for the pulse modulated circuit 10 of triggering thyristor in one embodiment, a kind of
Triggering thyristor pulse modulated circuit 10 include: impulse waveform generation circuit 101, modulated signal producing circuit 102 and with
Gate circuit 103, AND gate circuit 103 are connect with impulse waveform generation circuit 101 and modulated signal producing circuit 102 respectively.
Impulse waveform generation circuit 101 is used to generate pulse width modulated waveform, and wide to the output pulse of AND gate circuit 103
Spend modulation waveform.For example, pulse width modulated waveform, that is, PWM wave.
Modulated signal producing circuit 102 is used to generate pulse width modulating signal, and wide to the output pulse of AND gate circuit 103
Spend modulated signal.For example, pulse width modulating signal, that is, PWM modulation signal.
AND gate circuit 103 is used to pulse width modulated waveform and pulse width modulating signal carrying out logic and operation with life
At driving signal, and to 104 output drive signal of thyristor to trigger thyristor 104.
The pulse modulated circuit 10 of above-mentioned triggering thyristor, impulse waveform generation circuit 101 generate pulse width modulation wave
Shape, modulated signal producing circuit 102 generate pulse width modulating signal, and AND gate circuit 103 is by pulse width modulated waveform and arteries and veins
It rushes bandwidth modulation signals and carries out logic and operation to generate driving signal, and to thyristor output driving signal, to trigger crystalline substance
Brake tube, it is known that the driving signal generated after logic and operation is flash triggering, and thyristor can be made sufficiently conductive, improves triggering electricity
The reliability on road can greatly reduce driving core while guaranteeing accurate Trigger Angle and trigger energy, that is, pulse operating time
The gate pole of the thyristor of piece is lost, and improves the quality of pulse modulated circuit, the circuit is simple and reliable and is easily achieved.
For generate and output pulse width modulation waveform, for example, impulse waveform generation circuit include digital signal processor,
Micro-control unit or field programmable gate array.It is found that digital signal processor, micro-control unit and field programmable gate
Array can produce PWM wave.For example, impulse waveform generation circuit includes digital signal processor DSP, to generate PWM by DSP
Wave；For another example, impulse waveform generation circuit includes micro-control unit MCU, to generate PWM wave by MCU；For another example, impulse waveform produces
Raw circuit includes on-site programmable gate array FPGA, to generate PWM wave by FPGA.
For the on-state rate for improving thyristor, in an embodiment, the pulse width that modulated signal producing circuit generates modulates letter
Number there is predetermined width to keep thyristor abundant so that thyristor can reach within the action time of the pulse holds up column current
Conducting.It should be pointed out that the predetermined width of pulse width modulating signal can be determined according to the actual conditions of circuit.
Further, the pulse modulated circuit for triggering thyristor further includes power amplification circuit.Power amplification circuit with
The output end of gate circuit connects, for carrying out power amplification to the driving signal exported by AND gate circuit.In the present embodiment, power
Amplifying circuit can use existing circuit module, can also be repaired according to the actual needs of circuit to existing circuit module
Change.Driving signal known to so increases into its power after overpower amplifying circuit, and carrying load ability is stronger, further increases
The on-state rate of thyristor.
It is the module diagram that the pulse modulated circuit of thyristor is triggered in another embodiment referring to FIG. 1-2, this
In embodiment, impulse waveform generation circuit 101 includes i.e. DSP three road PWM waveforms of sending for digital signal processor DSP, i.e.,
PWM1 waveform, PWM2 waveform and PWM3 waveform.Modulated signal producing circuit 102 includes modulated signal producing circuit 1, modulation letter
Number generation circuit 2 and modulated signal producing circuit 3.AND gate circuit 103 is electric including AND gate circuit 1, AND gate circuit 2 and with door
Road 3.Driving circuit 105 includes thyristor 1, thyristor 2 and thyristor 3.It should be noted that driving circuit 105 is this reality
Apply the pulse modulated circuit circuit module to be driven of the triggering thyristor of example.
In the present embodiment, the pulse width that the waveform PWM1 and modulated signal producing circuit 1 that DSP is issued are generated modulates letter
AND gate circuit 1 is inputted number together, and output is to driving circuit 105 after the logic and operation of AND gate circuit 1, to trigger thyristor 1.
Similarly, the pulse width modulating signal that the waveform PWM2 and modulated signal producing circuit 2 that DSP is issued are generated inputs together and door
Circuit 2, output is to driving circuit 105 after the logic and operation of AND gate circuit 2, to trigger thyristor 2.Similarly, DSP is issued
The pulse width modulating signal that waveform PWM3 and modulated signal producing circuit 3 generate inputs AND gate circuit 3 together, electric with door
Output is to driving circuit 305 after the logic and operation on road 3, to trigger thyristor 3.In the present embodiment, DSP is simultaneously emitted by PWM1 wave
Shape, PWM2 waveform and PWM3 waveform guarantee accurate Trigger Angle to trigger thyristor 1, thyristor 2 and thyristor 3 simultaneously
With trigger energy to drive the driving circuit 105.
Referring to Fig. 2, its module diagram for modulated signal producing circuit 102 in one embodiment, for example, modulation letter
Number generation circuit 102 includes: the first self-oscillation circuit 201, the first frequency selection circuit 202 and the first filtering shaping circuit 203,
First self-oscillation circuit 201 is connect respectively with the first frequency selection circuit 202 and the connection of the first filtering shaping circuit 203, and first
Frequency selection circuit 202 is connect with the first filtering shaping circuit 203, and the first filtering shaping circuit 203 is connect with the AND gate circuit 103.
First self-oscillation circuit 201 is for defeated to the first frequency selection circuit 202 and the first filtering shaping circuit 203 respectively
First modulated pulse signal out, the first frequency selection circuit 202 are used to adjust the duty ratio of the first modulated pulse signal, generate and export
Second modulated pulse signal, the first modulation arteries and veins that the first filtering shaping circuit 203 is used to export the first self-oscillation circuit 201
The second modulated pulse signal for rushing signal and the output of the first frequency selection circuit 202 carries out Shape correction to generate pulse width modulation
Signal, and to 103 output pulse width modulated signal of AND gate circuit.
Referring to Fig. 3, its schematic illustration for modulated signal producing circuit in one embodiment, for example, the first self-excitation
Oscillating circuit includes resistance R11, capacitor C11, phase inverter U11B.For example, the first frequency selection circuit 202 includes capacitor C12, resistance
R12.For example, the first filtering shaping circuit 203 includes phase inverter U12B, phase inverter U13B and door U14A.In the present embodiment, electricity
Hindering the resistance value of R11 and resistance R12 for the capacitance of 10K, capacitor C11 and capacitor C12 is 10nF, phase inverter U11B, phase inverter
U12B and phase inverter U13B uses six tunnel schmidt trigger reverser 74LS14N, with door U14A using model 7408J and door
Circuit.It is appreciated that phase inverter U11B, phase inverter U12B and phase inverter U13B are schmitt inverter, circuit can be enhanced
Anti-interference ability avoids false triggering.
For example, one end of capacitor C11 is grounded, the other end is connect with the input terminal of phase inverter U11B.Resistance R11 is respectively and instead
The input terminal of phase device U11B is connected with output end.One end of capacitor C12 is connect with the output end of phase inverter U11B, the other end and anti-
The input terminal of phase device U12B connects.One end of resistance R12 is connect with the input terminal of phase inverter U12B, other end ground connection.Phase inverter
The input terminal of U13B is connect with the output end of phase inverter U12B, and the output end of phase inverter U13B connects with the input terminal of this and door U14A
It connects.The output end of phase inverter U11B be connect with this with the input terminal of door U14A.With the output end and the AND gate circuit 103 of door U14A
Input terminal connection.
It is appreciated that the first self-oscillation circuit 201 being made of resistance R11, capacitor C11, phase inverter U11B, by capacitor
First frequency selection circuit 202 of C12, resistance R12 composition and by phase inverter U12B, phase inverter U13B, formed with door U14A the
One filtering shaping circuit 203, circuit is simple and reliable, it is easy to accomplish.The electric current that first filtering shaping circuit is exported to AND gate circuit
I.e. rear class driving current can at most be reduced to original 10%, and the modulation pulse is flash triggering, than common PWM level
Triggering can make thyristor sufficiently conductive, improve the reliability of trigger circuit.It should be noted that flash refers to each modulation
Current amplitude in pulse period can achieve it is very high, be normal drive current several times, quickly and effectively to drive thyristor.Afterwards
The characteristic of the specific effect component related to thyristor etc. of the reduction degree of grade driving current is related, also can under normal conditions
It is reduced to original one third.
As shown in figure 3, in self-oscillation circuit, U11B is phase inverter, and R11 and C11 are respectively charge and discharge in the present embodiment
Resistance and capacitor, the voltage at the both ends initial time C11 are 0, and phase inverter U11B exports high level and gives capacitor C11 by R11
Charging, the voltage at the both ends capacitor C11 slowly increase, after being greater than the high level voltage of phase inverter U11B, phase inverter U11B output
0, capacitor C11 start to discharge over the ground by R11, and the voltage at the both ends capacitor C11 slowly reduces, when the low electricity for being lower than phase inverter U11B
When ordinary telegram is pressed, phase inverter U11B output 1 so recycles, just exports a series of modulated pulse signals.The frequency of modulated signal depends on
In the size of R, C.In specific application, the precision and driving chip of the Trigger Angle of actual thyristor gating circuit are considered as
Power consumption.Frequency is higher, and triggering angular accuracy is higher, and the loss of driving chip gate pole is bigger.Therefore, it is necessary to according to Practical Project need
It wants, seeks equalization point between Trigger Angle and power consumption.Ensure the sufficiently conductive gate pole loss that also reduce trigger circuit of thyristor,
And then improve the performance of thyristor gating circuit.
In frequency-selective network, the capacitance of capacitor C12 determines the duty ratio of the signal of final output, and capacitance is bigger,
Duty ratio is bigger, needs when design to be comprehensively considered according to driving power consumption and turn on thyristors angle triggering requirement.
In the filtering shaping circuit being made of U12B, U13B, U14A, U12B, U13B are schmitt inverter, pass through two
Grade reverse phase can carry out shaping to the pwm signal that frequency-selective network exports, and obtain ideal PWM waveform.By being incited somebody to action with door U14A
The output phase of output and self-maintained circuit after phase inverter and the reliability that this circuit output can be improved.
Referring to Fig. 4, its module diagram for modulated signal producing circuit in another embodiment, for example, modulation letter
Number generation circuit includes: the second self-oscillation circuit 401, the second frequency selection circuit 402 and the second filtering shaping circuit 403.Example
Such as, the second self-oscillation circuit 401 is connect with the second frequency selection circuit 402, the second frequency selection circuit 402 and the second filtering shaping circuit
403 connections, the second filtering shaping circuit 403 are connect with the AND gate circuit 103.
For example, the second self-oscillation circuit 401 is used to export the second modulated pulse signal to the second frequency selection circuit 402.The
Two frequency selection circuits 402 are used to adjust the duty ratio of the second modulated pulse signal, generate and export the second modulated pulse signal.Second
The second modulated pulse signal that filtering shaping circuit 403 is used to export the second frequency selection circuit 402 carries out Shape correction to generate
Pulse width modulating signal, and to 103 output pulse width modulated signal of AND gate circuit.
Referring to Fig. 5, its schematic illustration for modulated signal producing circuit in another embodiment, for example, second from
Swashing oscillating circuit 401 includes resistance R21, capacitor C21, phase inverter U21B, and the second frequency selection circuit 402 includes capacitor C22, resistance
R22, the second filtering shaping circuit 403 include phase inverter U22B, phase inverter U23B.In the present embodiment, resistance R21 and resistance R22
Resistance value be 10K, capacitor C21 and capacitor C22 capacitance be 10nF, phase inverter U21B, phase inverter U22B and phase inverter
U23B uses six tunnel schmidt trigger reverser 74LS14N.It is appreciated that phase inverter U21B, phase inverter U22B and phase inverter
U23B is schmitt inverter, and the anti-interference ability of circuit can be enhanced, avoid false triggering.
For example, one end of capacitor C21 is grounded, the other end is connect with the input terminal of phase inverter U21B.Resistance R21 is respectively and instead
The input terminal of phase device U21B is connected with output end.One end of capacitor C22 is connect with the output end of phase inverter U21B, the other end and anti-
The input terminal of phase device U22B connects.One end of resistance R22 is connect with the input terminal of phase inverter U22B, other end ground connection.Phase inverter
The input terminal of U23B is connect with the output end of phase inverter U22B, the input of the output end of phase inverter U23B and the AND gate circuit 103
End connection.
It is appreciated that the second self-oscillation circuit 401 being made of resistance R21, capacitor C21, phase inverter U21B, by capacitor
Second frequency selection circuit 402 of C22, resistance R22 composition and by phase inverter U22B, phase inverter U23B, formed with door U24A the
Two filtering shaping circuits 403, circuit is simple and reliable, it is easy to accomplish.The electric current that second filtering shaping circuit is exported to AND gate circuit
I.e. rear class driving current can at most be reduced to original 10%, and the modulation pulse is flash triggering, than common PWM level
Triggering can make thyristor sufficiently conductive, improve the reliability of trigger circuit.It should be noted that flash refers to each modulation
Current amplitude in pulse period can achieve it is very high, be normal drive current several times, quickly and effectively to drive thyristor.Afterwards
The characteristic of the specific effect component related to thyristor etc. of the reduction degree of grade driving current is related, also can under normal conditions
It is reduced to original one third.
As shown in figure 5, in self-oscillation circuit, U21B is phase inverter, and R21 and C21 are respectively charge and discharge in the present embodiment
Resistance and capacitor.The voltage at the both ends initial time C21 is 0, and phase inverter U21B exports high level and gives capacitor C21 by R21
Charging, the voltage at the both ends capacitor C21 slowly increase, after being greater than the high level voltage of phase inverter U21B, phase inverter output 0, and electricity
Holding C21 to start to discharge over the ground by R21, the voltage at both ends slowly reduces, when being lower than the low level voltage of phase inverter U21B,
Phase inverter output 1, so recycles, just exports a series of modulated pulse signals.The frequency of modulated signal depends on the size of R, C.
In specific application, the precision of the Trigger Angle of actual thyristor gating circuit and the power consumption of driving chip are considered as.Frequency
Higher, triggering angular accuracy is higher, and the loss of driving chip gate pole is bigger.Therefore, it is necessary to according to actual requirement of engineering, in Trigger Angle and
Seek equalization point between power consumption.Ensure the sufficiently conductive gate pole loss that also reduce trigger circuit of thyristor, and then improves brilliant lock
The performance of pipe trigger circuit.
In frequency-selective network, the capacitance of C5 determines the duty ratio of the signal of final output, and capacitance is bigger, duty ratio
It is bigger, it needs when design to be comprehensively considered according to driving power consumption and turn on thyristors angle triggering requirement.
In the filtering shaping circuit being made of U22B, U23B, U12B, U13B are schmitt inverter, anti-by two-stage
Can mutually shaping be carried out to the pwm signal that frequency-selective network exports, obtain ideal PWM waveform.Two will be formed by U22B, U23B
Grade inverter cricuit output directly as circuit output, to drive thyristor gating circuit.
Referring to Fig. 6, its step schematic diagram for the method 20 of triggering thyristor in one embodiment, the triggering thyristor
Method be applied to the various embodiments described above triggering thyristor pulse modulated circuit.For example, a kind of method for triggering thyristor
20 include:
Step S601: impulse waveform generation circuit and modulated signal producing circuit are established.
Specifically, impulse waveform generation circuit and modulated signal producing circuit are such as Fig. 3 or circuit shown in fig. 5.Pulse
Waveform generating circuit includes digital signal processor, micro-control unit or field programmable gate array.Modulated signal generates electricity
The pulse width modulating signal that road generates has predetermined width, so that thyristor can reach within the action time of the pulse
Column current is held up, keeps thyristor sufficiently conductive.
Step S602: generating pulse width modulated waveform by impulse waveform generation circuit, and, it is produced by modulated signal
Raw circuit evolving pulse width modulating signal.
Specifically, impulse waveform generation circuit exports pulse for generating pulse width modulated waveform, and to AND gate circuit
Wide modulation waveform.For example, pulse width modulated waveform, that is, PWM wave.Modulated signal producing circuit is for generating pulse width tune
Signal processed, and to AND gate circuit output pulse width modulated signal.For example, pulse width modulating signal, that is, PWM modulation signal.
Step S603: pulse width modulated waveform and pulse width modulating signal are subjected to logic and operation, generation obtains
Driving signal.
Specifically, establishing AND gate circuit.For example, AND gate circuit is such as Fig. 3 or circuit shown in fig. 5.AND gate circuit is used for
Pulse width modulated waveform and pulse width modulating signal are subjected to logic and operation to generate driving signal, and defeated to thyristor
Driving signal is out to trigger thyristor.
Step S604: output drive signal to thyristor is to trigger thyristor.
Specifically, impulse waveform generation circuit generates three tunnel pulse width modulated waveforms simultaneously, and exported to AND gate circuit
The three tunnels pulse width modulated waveform.For example, pulse width modulated waveform, that is, PWM wave.It is generated for example, setting up three modulated signals
Circuit, it is every to generate pulse width modulating signal all the way, and respectively to AND gate circuit output pulse width modulated signal.
The method 20 of above-mentioned triggering thyristor, impulse waveform generation circuit generate pulse width modulated waveform, modulated signal
Generation circuit generates pulse width modulating signal, and AND gate circuit carries out pulse width modulated waveform and pulse width modulating signal
Logic and operation is to generate driving signal, and to thyristor output driving signal, to trigger thyristor, it is known that logic and operation
The driving signal generated afterwards is flash triggering, and thyristor can be made sufficiently conductive, improve the reliability of trigger circuit, is guaranteeing essence
The gate pole damage of the thyristor of driving chip can be greatly reduced while true Trigger Angle and trigger energy, that is, pulse operating time
Consumption, improves the quality of pulse modulated circuit, the circuit is simple and reliable and is easily achieved.
In one embodiment, the step of output drive signal to thyristor is to trigger thyristor includes: amplification driving signal
Power；To the driving signal after thyristor output power amplification with triggering and conducting thyristor.
Specific: the pulse modulated circuit for triggering thyristor further includes power amplification circuit.Power amplification circuit with should be with
The output end of gate circuit connects, to amplify the power of the driving signal of AND gate circuit output.Know that driving signal is put into overpower
Its power increases after big circuit, and carrying load ability is stronger, further increases the on-state rate of thyristor.In this way, in thyristor
In trigger circuit, by microcontroller issue PWM wave and PWM modulation signal phase with, be then re-fed into driving chip progress power
Amplify and drives turn on thyristors.The pulse that modulated signal producing circuit generates has certain width, so that thyristor is at this
It can reach in pulse operating time and hold up column current, keep thyristor sufficiently conductive.
The present embodiment has the beneficial effect that
(1) driving power consumption is reduced, i.e. this method is guaranteeing accurate Trigger Angle and trigger energy, that is, pulse operating time
The gate pole loss of driving chip can be greatly reduced simultaneously.
(2) circuit is simple and effective is easily achieved, and rear class driving current at most can be reduced to original 10%, need to refer to
Out, the characteristic of the specific effect of the reduction component related to thyristor etc. of rear class driving current is related, under normal conditions
Also it can be reduced to original one third.It modulates pulse to trigger using flash, thyristor can be made to fill than common PWM level triggers
Divide conducting, improves the reliability of trigger circuit.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (9)
1. a kind of pulse modulated circuit for triggering thyristor (104) characterized by comprising impulse waveform generation circuit
(101), modulated signal producing circuit (102) and AND gate circuit (103), the AND gate circuit (103) respectively with the pulse
Waveform generating circuit (101) and the modulated signal producing circuit (102) connection；
The impulse waveform generation circuit (101) is used to generate pulse width modulated waveform, and defeated to the AND gate circuit (103)
The pulse width modulated waveform out；
The modulated signal producing circuit (102) is used to generate pulse width modulating signal, and defeated to the AND gate circuit (103)
The pulse width modulating signal out；
The AND gate circuit (103) is used to the pulse width modulated waveform and the pulse width modulating signal carrying out logic
With operation to generate driving signal, and for the driving signal to be output to thyristor (104) to trigger the thyristor
(104)；
Power amplification circuit, the input terminal of the power amplification circuit is connect with the output end of the AND gate circuit (103), described
The output end of power amplification circuit is connect with the thyristor (104), for the driving to being exported by the AND gate circuit (103)
Signal carries out power amplification, and the driving signal is output to the thyristor (104) to trigger the thyristor (104)；
The modulated signal producing circuit (102) include: the first self-oscillation circuit (201), the first frequency selection circuit (202) and
First filtering shaping circuit (203), first self-oscillation circuit (201) connect with first frequency selection circuit (202) respectively
It connects and first filtering shaping circuit (203) connection, first frequency selection circuit (202) and first filter shape is electric
Road (203) connection, first filtering shaping circuit (203) connect with the AND gate circuit (103)；
First self-oscillation circuit (201) is for respectively to first frequency selection circuit (202) and first filtering
Shaping circuit (203) exports the first modulated pulse signal, and first frequency selection circuit (202) is for adjusting the first modulation arteries and veins
The duty ratio for rushing signal, generates and exports the second modulated pulse signal, and first filtering shaping circuit (203) is used for described
First modulated pulse signal of first self-oscillation circuit (201) output and first frequency selection circuit (202) output
Second modulated pulse signal carry out Shape correction to generate the pulse width modulating signal, and it is wide to export the pulse
Modulated signal is spent to the AND gate circuit (103).
2. the pulse modulated circuit of triggering thyristor (104) according to claim 1, which is characterized in that described first certainly
Swashing oscillating circuit (201) includes resistance R11, capacitor C11, phase inverter U11B, and first frequency selection circuit (202) includes capacitor
C12, resistance R12, first filtering shaping circuit (203) include phase inverter U12B, phase inverter U13B and door U14A；
One end of capacitor C11 is grounded, and the other end is connect with the input terminal of phase inverter U11B；
Resistance R11 is connect with the input terminal of phase inverter U11B and output end respectively；
One end of capacitor C12 is connect with the output end of phase inverter U11B, and the other end is connect with the input terminal of phase inverter U12B；
One end of resistance R12 is connect with the input terminal of phase inverter U12B, other end ground connection；
The input terminal of phase inverter U13B is connect with the output end of phase inverter U12B, the output end of phase inverter U13B with door U14A's
Input terminal connection；
The output end of phase inverter U11B is also connect with the input terminal of door U14A；
It is connect with the output end of door U14A with the input terminal of the AND gate circuit (103).
3. the pulse modulated circuit of triggering thyristor (104) according to claim 2, which is characterized in that phase inverter U12B
It is schmitt inverter with phase inverter U13B.
4. a kind of pulse modulated circuit for triggering thyristor (104) characterized by comprising impulse waveform generation circuit
(101), modulated signal producing circuit (102) and AND gate circuit (103), the AND gate circuit (103) respectively with the pulse
Waveform generating circuit (101) and the modulated signal producing circuit (102) connection；
The impulse waveform generation circuit (101) is used to generate pulse width modulated waveform, and defeated to the AND gate circuit (103)
The pulse width modulated waveform out；
The modulated signal producing circuit (102) is used to generate pulse width modulating signal, and defeated to the AND gate circuit (103)
The pulse width modulating signal out；
The AND gate circuit (103) is used to the pulse width modulated waveform and the pulse width modulating signal carrying out logic
With operation to generate driving signal, and for the driving signal to be output to thyristor (104) to trigger the thyristor
(104)；
Power amplification circuit, the input terminal of the power amplification circuit is connect with the output end of the AND gate circuit (103), described
The output end of power amplification circuit is connect with the thyristor (104), for the driving to being exported by the AND gate circuit (103)
Signal carries out power amplification, and the driving signal is output to the thyristor (104) to trigger the thyristor (104)；
The modulated signal producing circuit (102) include: the second self-oscillation circuit (401), the second frequency selection circuit (402) and
Second filtering shaping circuit (403), second self-oscillation circuit (401) connect with second frequency selection circuit (402), institute
It states the second frequency selection circuit (402) to connect with second filtering shaping circuit (403), second filtering shaping circuit (403)
It is connect with the AND gate circuit (103)；
Second self-oscillation circuit (401), second frequency selection circuit of Xiang Suoshu (402) exports the second modulated pulse signal, described
Second frequency selection circuit (402) is used to adjust the duty ratio of second modulated pulse signal, generates and exports the second modulation pulse
Signal, the second modulation arteries and veins that second filtering shaping circuit (403) is used to export second frequency selection circuit (402)
It rushes signal and carries out Shape correction to generate the pulse width modulating signal, and export the arteries and veins to the AND gate circuit (103)
Rush bandwidth modulation signals.
5. the pulse modulated circuit of triggering thyristor (104) according to claim 4, which is characterized in that described second certainly
Swashing oscillating circuit (401) includes resistance R21, capacitor C21, phase inverter U21B, and second frequency selection circuit (402) includes capacitor
C22, resistance R22, second filtering shaping circuit (403) includes phase inverter U22B, phase inverter U23B；
One end of capacitor C21 is grounded, and the other end is connect with the input terminal of phase inverter U21B；
Resistance R21 is connect with the input terminal of phase inverter U21B and output end respectively；
One end of capacitor C22 is connect with the output end of phase inverter U21B, and the other end is connect with the input terminal of phase inverter U22B；
One end of resistance R22 is connect with the input terminal of phase inverter U22B, other end ground connection；
The input terminal of phase inverter U23B is connect with the output end of phase inverter U22B, the output end of phase inverter U23B and described and door electricity
The input terminal on road (103) connects.
6. the pulse modulated circuit of triggering thyristor (104) according to claim 5, which is characterized in that phase inverter U22B
It is schmitt inverter with phase inverter U23B.
7. the pulse modulated circuit or claim 4 of triggering thyristor (104) according to any one of claim 1 to 3
To the pulse modulated circuit of triggering thyristor (104) described in any one of 6, which is characterized in that the impulse waveform generates electricity
Road (101) includes digital signal processor, micro-control unit or field programmable gate array.
8. a kind of method of the triggering thyristor of the pulse modulated circuit of triggering thyristor (104) as claimed in claim 7,
It is characterized in that, comprising:
Establish impulse waveform generation circuit and modulated signal producing circuit；
Pulse width modulated waveform is generated by the impulse waveform generation circuit, and, electricity is generated by the modulated signal
Road generates pulse width modulating signal；
The pulse width modulated waveform and the pulse width modulating signal are subjected to logic and operation, generation obtains driving letter
Number；
The driving signal is exported to thyristor to trigger the thyristor.
9. the method for triggering thyristor according to claim 8, which is characterized in that the output driving signal to crystalline substance
Brake tube is to trigger the thyristor, comprising:
Amplify the power of the driving signal；
To the driving signal after the thyristor output power amplification with thyristor described in triggering and conducting.
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| CN201610831914.1A CN106329891B (en) | 2016-09-18 | 2016-09-18 | Trigger the pulse modulated circuit and method of thyristor |
| CN201910730467.4A CN110474520B (en) | 2016-09-18 | 2016-09-18 | Pulse modulation circuit and method for triggering thyristor |
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|---|---|
| CN106329891A (en) | 2017-01-11 |
| CN110474520A (en) | 2019-11-19 |
| CN110474520B (en) | 2021-03-23 |
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