CN107124172B - Thyristor trigger circuit - Google Patents
Thyristor trigger circuit Download PDFInfo
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- CN107124172B CN107124172B CN201710335299.XA CN201710335299A CN107124172B CN 107124172 B CN107124172 B CN 107124172B CN 201710335299 A CN201710335299 A CN 201710335299A CN 107124172 B CN107124172 B CN 107124172B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/72—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices having more than two PN junctions; having more than three electrodes; having more than one electrode connected to the same conductivity region
- H03K17/722—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices having more than two PN junctions; having more than three electrodes; having more than one electrode connected to the same conductivity region with galvanic isolation between the control circuit and the output circuit
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Abstract
The application discloses thyristor trigger circuit includes: the input end of the first stabilized voltage power supply is connected with the direct-current power supply, the output end of the first stabilized voltage power supply, one end of the first current-limiting resistor and one end of the second current-limiting resistor are connected with the second end of the input unit, the other end of the first current-limiting resistor is connected with the first end of the first output unit, and the other end of the second current-limiting resistor and the second end of the nth output unit are connected with the first end of the input unit; the final stage board circuit comprises n control circuits, the input end of each control circuit is respectively connected with the corresponding output unit and the corresponding thyristor, each control circuit comprises a strong trigger circuit, and n is a positive integer. Therefore, the trigger pulse circuit adopts a plurality of output units formed by the optocouplers to complete the photoelectric conversion of the pulse signal, realizes the safety isolation between the trigger pulse signal circuit and the control circuit, and ensures the trigger condition of the thyristor series circuit by adding the strong pulse trigger circuit in the control circuit.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a thyristor trigger circuit.
Background
With the development of power electronic equipment towards high voltage, large current and high power, a plurality of thyristors (thyristors) are connected in series and in parallel to be used as one arm in more and more occasions. In order to ensure the balance of voltage and current when each thyristor works, necessary measures need to be taken in the selection and use of devices.
When the series thyristors work, the voltage equalization of all devices is the most concerned problem. If one duty cycle of the series device is divided into five phases, it may include forward blocking, on, reverse recovery, and reverse blocking phases. In the forward and reverse blocking stages, the voltage distribution of the series devices is mainly determined by the blocking volt-ampere characteristics, i.e. the devices with hard characteristics and high blocking voltage under the same leakage current bear higher voltage. In the on-state, the device is transited from the off-state to the on-state, and if the on-time of the device is inconsistent, the later-on device bears overvoltage in a short time. In the reverse recovery stage, the device is transited from an on state to a reverse blocking state, and after a certain amount of reverse recovery charges are reversely extracted by the main current, the device recovers the reverse blocking capability. If the reverse recovery characteristics of the series devices are not identical, the first recovered device will experience an overvoltage.
According to the analysis, the voltage-sharing use of the series device mainly needs to solve the voltage distribution problem under the three states of forward and reverse blocking, turning on and recovering. In recent years, aiming at the series-parallel application requirements of thyristors in different fields, the consistency of the switching-on and recovery parameters of the devices is greatly improved through optimized design and process control, and meanwhile, series-parallel test equipment of medium and low frequency thyristors is developed to further screen the series-parallel devices.
In practical use of the series connection of thyristors, because parameters always have differences, necessary technical measures are required to improve the series use condition. The technical measures mainly comprise steady-state and dynamic voltage-sharing measures, thermal balance measures of series devices and gate trigger pulse measures; the technical problem to be solved by those skilled in the art is that of gate trigger pulse in high voltage application.
Disclosure of Invention
In view of this, the present invention provides a thyristor trigger circuit, which improves the pulse synchronization, ensures the safety isolation between the trigger pulse and the control circuit, and realizes the series triggering of the thyristor. The specific scheme is as follows:
a thyristor trigger circuit comprising: the trigger pulse circuit, the end plate circuit and the n thyristors are connected in series; the trigger pulse circuit comprises a first stabilized voltage power supply, a first current-limiting resistor, a second current-limiting resistor, n output units and an input unit which are connected with each other, wherein the input end of the first stabilized voltage power supply is connected with a direct-current power supply, the output end of the first stabilized voltage power supply, one end of the first current-limiting resistor and one end of the second current-limiting resistor are connected with the second end of the input unit, the other end of the first current-limiting resistor is connected with the first end of the first output unit, and the other end of the second current-limiting resistor and the second end of the nth output unit are connected with the first end of the input unit; the last-stage board circuit comprises n control circuits, the input end of each control circuit is respectively connected with the corresponding output unit, and the output end of each control circuit is respectively connected with the corresponding thyristor;
each output unit comprises a first capacitor and a first optocoupler, the first capacitor is connected with a light emitting diode of the first optocoupler in parallel, the anode of the light emitting diode is used as the first end of the output unit, the cathode of the light emitting diode is used as the second end of the output unit, each output unit is connected in series, and the second end of the previous output unit is connected with the first end of the next output unit; each control circuit comprises a strong trigger circuit, and n is a positive integer.
Preferably, the input unit includes a second capacitor and a second optocoupler, one end of the second capacitor, a second end of the second optocoupler and a fourth end of the second optocoupler are grounded, the other end of the second capacitor, a third end of the second optocoupler and an output end of the first voltage-stabilized power supply are connected, a first end of the second optocoupler serves as a first end of the input unit, and a third end of the second optocoupler serves as a second end of the input unit.
Preferably, the first voltage-stabilizing power supply comprises a three-terminal voltage-stabilizing tube, a first voltage-dividing resistor and a second voltage-dividing resistor, an input end of the three-terminal voltage-stabilizing tube is connected with a direct-current power supply, an output end of the three-terminal voltage-stabilizing tube is connected with one end of the first voltage-dividing resistor, the other end of the first voltage-dividing resistor is connected with one section of the second voltage-dividing resistor, the other end of the second voltage-dividing resistor is grounded, a third end of the three-terminal voltage-stabilizing tube is connected between the first voltage-dividing resistor and the second voltage-dividing resistor, an input end of the three-terminal voltage-stabilizing tube serves as an input end of the first voltage-stabilizing power supply, and an output end.
Preferably, the strong trigger circuit includes a first energy storage capacitor, a second energy storage capacitor and a resistor, the first energy storage capacitor is connected in parallel with the second energy storage capacitor, the first end of the resistor, the first end of the first energy storage capacitor and the first end of the second energy storage capacitor are connected with each other, the second end of the resistor is used as the input end of the strong trigger circuit, and the second end of the first energy storage capacitor is used as the output end of the strong trigger circuit.
Preferably, the trigger pulse circuit further comprises a first indicating circuit connected in series between the output terminal of the first voltage-stabilized power supply and the ground terminal; the first indicating circuit comprises a second resistor and a first light emitting diode, one end of the second resistor is connected with the output end of the first voltage stabilizing power supply, the other end of the second resistor is connected with the anode of the first light emitting diode, and the cathode of the first light emitting diode is grounded.
Preferably, each control circuit further comprises a second indicating circuit; the second indicating circuit comprises a third resistor and a second light emitting diode, one end of the third resistor, the output end of the strong trigger circuit and the output end of the steady-state signal output circuit are connected, the other end of the third resistor is connected with one end of the second light emitting diode, and the other end of the second light emitting diode is grounded.
Preferably, in the n control circuits, each control circuit includes a bridge rectifier module, an ac power input interface, a rectifier filter circuit, a second voltage-stabilized power supply, a photoelectric conversion unit, a signal amplification circuit, and a steady-state signal output circuit, which are connected in sequence; the alternating current power supply input interface, the bridge rectifier module and the rectifier filter circuit are sequentially connected in series, a first end of the signal amplification circuit is connected with a first end of the photoelectric conversion unit, a second end of the signal amplification circuit, an output end of the rectifier filter circuit and an input end of a second stabilized voltage power supply are connected, a third end of the signal amplification circuit, an input end of the strong trigger circuit and an input end of the steady-state signal output circuit are connected, an output end of the second stabilized voltage power supply is connected with a second end of the photoelectric conversion unit, the photoelectric conversion unit is connected with a corresponding output unit in the trigger pulse circuit, an output end of the strong trigger circuit is connected with an output end of the steady-state signal output circuit, and a third end of the steady-state signal output circuit is grounded.
Preferably, the photoelectric conversion unit includes a third capacitor and a third optical coupler; one end of the third capacitor is grounded with the second end of the third optocoupler, the other end of the third capacitor, the third end of the third optocoupler and the output end of the second voltage-stabilized power supply are connected, the fourth end of the third optocoupler is grounded, and the first end of the third optocoupler is connected with the first end of the amplifying circuit.
Preferably, the signal amplification circuit includes an amplification element, a fourth resistor, a fifth resistor, and a fourth capacitor; the first end of the amplifying element, one end of the fourth resistor and one end of the fifth resistor are connected, the second end of the amplifying element, the output end of the rectifying and filtering circuit and the third end of the second stabilized voltage power supply are connected, the third end of the amplifying element, the input end of the strong trigger circuit and the input end of the steady-state signal output circuit are connected, one end of the fourth capacitor is connected with the input end of the second stabilized voltage power supply, and the other end of the fourth capacitor is connected with the first end of the amplifying element.
Preferably, the steady-state signal output circuit includes a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, and a fifth capacitor, the sixth resistor is connected in series with the seventh resistor, the eighth resistor is connected in series with the ninth resistor, a series circuit of the sixth resistor and the seventh resistor is connected in parallel with a series circuit of the eighth resistor and the ninth resistor, a common end of the sixth resistor and the eighth resistor, an input end of the strong trigger circuit, and an output end of the signal amplification circuit are connected, a common end of the seventh resistor and the ninth resistor, one end of the fifth capacitor, and one end of the tenth resistor are connected, and the fifth capacitor and the tenth resistor are connected in parallel.
In the present invention, the thyristor trigger circuit includes: the trigger pulse circuit, the end plate circuit and the n thyristors are connected in series; the trigger pulse circuit comprises a first voltage-stabilizing power supply, a first current-limiting resistor, a second current-limiting resistor, n output units and an input unit which are connected with each other, wherein the input end of the first voltage-stabilizing power supply is connected with a direct-current power supply, the output end of the first voltage-stabilizing power supply, one end of the first current-limiting resistor and one end of the second current-limiting resistor are connected with the second end of the input unit, the other end of the first current-limiting resistor is connected with the first end of the first output unit, and the other end of the second current-limiting resistor and the second end of the nth output unit are connected with the first end of the input unit; the last-stage board circuit comprises n control circuits, the input end of each control circuit is respectively connected with the corresponding output unit, and the output end of each control circuit is respectively connected with the corresponding thyristor; each output unit comprises a first capacitor and a first optocoupler, the first capacitor is connected with a light emitting diode of the first optocoupler in parallel, the anode of the light emitting diode is used as the first end of the output unit, the cathode of the light emitting diode is used as the second end of the output unit, each output unit is connected in series, and the second end of the previous output unit is connected with the first end of the next output unit; each control circuit comprises a strong trigger circuit, and n is a positive integer. Therefore, the trigger pulse circuit adopts a plurality of output units formed by the optocouplers to complete the photoelectric conversion of the pulse signal, realizes the safety isolation between the trigger pulse signal circuit and the control circuit, and ensures the trigger condition of the thyristor series circuit by adding the strong pulse trigger circuit in the control circuit.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic diagram of a thyristor trigger circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a trigger pulse circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a control circuit according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention discloses a thyristor trigger circuit, which comprises the following components as shown in figure 1: the trigger pulse circuit, the end plate circuit and the n thyristors are connected in series; the trigger pulse circuit comprises a first stabilized voltage power supply 11, a first current limiting resistor R21, a second current limiting resistor R22, n output units and an input unit 12 which are connected with each other, wherein the input end of the first stabilized voltage power supply 11 is connected with a direct current power supply, the output end of the first stabilized voltage power supply 11, one end of a first current limiting resistor R21 and one end of a second current limiting resistor R22 are connected with the second end of the input unit 12, the other end of the first current limiting resistor R21 is connected with the first end of a first output unit O1, and the other end of the second current limiting resistor R22, the second end of an nth output unit On and the first end of the input unit 12 are connected; the last-stage board circuit comprises n control circuits, the input end of each control circuit is respectively connected with the corresponding output unit, and the output end of each control circuit is respectively connected with the corresponding thyristor;
each output unit comprises a first capacitor and a first optocoupler, the first capacitor is connected with a light emitting diode of the first optocoupler in parallel, the anode of the light emitting diode is used as the first end of the output unit, the cathode of the light emitting diode is used as the second end of the output unit, each output unit is connected in series, and the second end of the previous output unit is connected with the first end of the next output unit; each control circuit comprises a strong trigger circuit, and n is a positive integer.
Specifically, the trigger pulse circuit is connected with a direct-current power supply, the direct-current power supply is connected with an input end of a first stabilized power supply 11 in the trigger pulse circuit, the first stabilized power supply 11 generates a voltage which accords with the operation of the trigger pulse circuit to drive the operation of the trigger pulse circuit, an input unit 12 receives a pulse signal in an optical signal form provided by an optical fiber, converts the pulse signal in the optical signal form into a pulse signal in an electrical signal form, inputs the pulse signal into n series-connected output units, then enables the n series-connected output units to convert the pulse signal in the electrical signal form into the pulse signal in the optical signal form, outputs the pulse signal in the optical signal form to corresponding n control circuits in a final-stage board circuit, utilizes the propagation speed advantage of light, and adopts the series-connected trigger pulse circuit to enable the time difference to be less than or equal to 40ns after the input light splitting, so as to guarantee the high synchronism; after each control circuit receives the pulse signals in the form of the optical signals, the pulse signals in the form of the optical signals are converted into the pulse signals in the form of the electric signals, the pulse signals in the form of the electric signals pass through the strong trigger circuit, the strength of the pulse signals is improved, and the high-strength pulse signals are transmitted to the corresponding thyristors to conduct the thyristors.
For example, n is 5, there are 5 output units, 5 control circuits and 5 thyristors, the first output unit corresponds to the first control circuit, the first control circuit corresponds to the first thyristor, and so on, the fifth output unit corresponds to the fifth control circuit, and the fifth control circuit corresponds to the fifth thyristor, wherein the input unit of the trigger pulse circuit receives the pulse signal in the form of optical signal transmitted by the optical fiber, the input unit converts the pulse signal in the form of optical signal into the pulse signal in the form of electrical signal, and transmits it to the first output unit, the first output unit performs photoelectric conversion, and transmits the pulse signal to the first control circuit, and the pulse signal is passed through the strong trigger circuit in the first control circuit to obtain a high-intensity pulse signal, and finally transmits the high-intensity pulse signal to the thyristor, so that the thyristor is turned on.
It can be understood that the specific model and specification of each circuit component in the embodiment of the present invention are not limited, and can be set according to the actual needs of the user.
Therefore, the trigger pulse circuit adopts a plurality of output units formed by the optocouplers to complete the photoelectric conversion of the pulse signal, realizes the safety isolation between the trigger pulse signal circuit and the control circuit, and ensures the trigger condition of the thyristor series circuit by adding the strong pulse trigger circuit in the control circuit.
The embodiment of the invention discloses a specific thyristor trigger circuit, and compared with the previous embodiment, the technical scheme is further explained and optimized by the embodiment. Referring to fig. 2 and 3, specifically:
in an embodiment of the present invention, the input unit 12 in the trigger pulse circuit may specifically include a second capacitor C24 and a second optical coupler R2521, one end of the second capacitor C24, a second end of the second optical coupler R2521, and a fourth end of the second optical coupler R2521 are grounded, the other end of the second capacitor C24, a third end of the second optical coupler R2521, and an output end of the first regulated power supply 11 are connected, a first end of the second optical coupler R2521 is used as a first end of the input unit 12, and a third end of the second optical coupler R2521 is used as a second end of the input unit 12; and the second optical coupler R2521 is used for realizing photoelectric conversion, and converting the pulse signal in the form of an optical signal input by the optical fiber into an electric signal.
In this embodiment of the present invention, the first regulated power supply 11 in the trigger pulse circuit may include a three-terminal regulator tube U11, a first voltage-dividing resistor R33 and a second voltage-dividing resistor R34, an input end of the three-terminal regulator tube U11 is connected to the dc power supply, an output end of the three-terminal regulator tube U11 is connected to one end of the first voltage-dividing resistor R33, another end of the first voltage-dividing resistor R33 is connected to one section of the second voltage-dividing resistor R34, another end of the second voltage-dividing resistor R34 is grounded, a third end of the three-terminal regulator tube U11 is connected between the first voltage-dividing resistor R33 and the second voltage-dividing resistor R34, an input end of the three-terminal regulator tube U11 serves as an input end of the first regulated power supply 11, and an output end of the three-; the first voltage regulator 11 is used to supply a suitable operating voltage to the trigger pulse circuit.
In an embodiment of the present invention, the strong trigger circuit 21 in each control circuit in the last board circuit may include a first energy-storage capacitor C7, a second energy-storage capacitor C8, and a first resistor R7, the first energy-storage capacitor C7 is connected in parallel with the second energy-storage capacitor C8, a first end of the first resistor R7, a first end of the first energy-storage capacitor C7, and a first end of the second energy-storage capacitor C8 are connected to each other, a second end of the first resistor R7 serves as an input end of the strong trigger circuit 21, and a second end of the first energy-storage capacitor C7 serves as an output end of the strong trigger circuit 21.
When the first energy storage capacitor C7 may be an aluminum electrolytic capacitor, and the first energy storage capacitor C7 is an aluminum electrolytic capacitor, the positive electrode of the first energy storage capacitor C7 serves as the first end, and the negative electrode of the first energy storage capacitor C7 serves as the second end.
Furthermore, in the n control circuits in the previous embodiment, each control circuit may include a bridge rectifier module U1, an ac power input interface U2, a rectifier filter circuit 23, a second voltage-stabilized power supply 24, a photoelectric conversion unit 25, a signal amplification circuit 26, and a steady-state signal output circuit 27, which are connected in sequence; the alternating current power supply input interface U2, the bridge rectifier module U1 and the rectifier filter circuit 23 are sequentially connected in series, the first end of the signal amplification circuit 26 is connected with the first end of the photoelectric conversion unit 25, the second end of the signal amplification circuit 26, the output end of the rectifier filter circuit 23 and the input end of the second stabilized voltage power supply 24 are connected, the third end of the signal amplification circuit 26, the input end of the strong trigger circuit 21 and the input end of the steady-state signal output circuit 27 are connected, the output end of the second stabilized voltage power supply 24 is connected with the second end of the photoelectric conversion unit 25, the photoelectric conversion unit 25 is connected with a corresponding output unit in the trigger pulse circuit, the output end of the strong trigger circuit 21 is connected with the output end of the steady-state signal output circuit 27, and the third end of the steady-state; the gate of the corresponding thyristor G1 is connected to the output of the corresponding steady-state signal output circuit 27, and the cathode of the thyristor G1 is connected to the anode of another series-connected thyristor G1.
Specifically, the rectifying and filtering circuit 23 may include a sixth capacitor C2, a seventh capacitor C3, an eighth capacitor C1, and an eleventh resistor R1 connected in parallel, one end of the sixth capacitor C2, one end of the seventh capacitor C3, one end of the eighth capacitor C1, and one end of the eleventh resistor R1 are connected to the first output end of the bridge rectifying module U1, the other end of the sixth capacitor C2, the other end of the seventh capacitor C3, the other end of the eighth capacitor C1, the other end of the eleventh resistor R1, and the second output end of the bridge rectifying module U1 are grounded, and one end of the eleventh resistor R1 is used as the output end of the rectifying and filtering circuit 23.
The sixth capacitor C2 and the seventh capacitor C3 may be aluminum electrolytic capacitors, anodes of the sixth capacitor C2 and the seventh capacitor C3 serve as one end of the sixth capacitor C2 and the seventh capacitor C3, and cathodes of the sixth capacitor C2 and the seventh capacitor C3 serve as the other end of the sixth capacitor C2 and the seventh capacitor C3.
Specifically, the second regulated power supply 24 may include a three-terminal regulator U21, a first voltage-dividing resistor R2 and a second voltage-dividing resistor R3, an input terminal of the three-terminal regulator U21 serves as an input terminal of the second regulated power supply 24, an output terminal of the three-terminal regulator U21 serves as an output terminal of the second regulated power supply 24 and is connected to one end of the first voltage-dividing resistor R2, the other end of the first voltage-dividing resistor R2, one end of the second voltage-dividing resistor R3 and a third end of the three-terminal regulator U21 are connected, and the other end of the second voltage-dividing resistor R3 is grounded.
Specifically, the photoelectric conversion unit 25 may include a third capacitor C5 and a third optical coupler R2521; one end of the third capacitor C5 and the second end of the third optical coupler R2521 are grounded, the other end of the third capacitor C5, the third end of the third optical coupler R2521 and the output end of the second regulated power supply 24 are connected, the fourth end of the third optical coupler R2521 is grounded, and the first end of the third optical coupler R2521 is connected with the first end of the amplifying circuit.
Specifically, the signal amplification circuit 26 may include an amplification element Q1, a sixth resistor R4, a seventh resistor R6, and a fourth capacitor C4; the first end of the amplifying element Q1, one end of the sixth resistor R4 and one end of the seventh resistor R6 are connected, the second end of the amplifying element Q1, the output end of the rectifying and filtering circuit 23 and the third end of the second stabilized voltage power supply 24 are connected, the third end of the amplifying element Q1, the input end of the strong trigger circuit 21 and the input end of the steady-state signal output circuit 27 are connected, one end of the fourth capacitor C4 is connected with the input end of the second stabilized voltage power supply 24, and the other end of the fourth capacitor C4 is connected with the first end of the amplifying element Q1.
Specifically, the steady-state signal output circuit 27 may include a sixth resistor R12, a seventh resistor R9, an eighth resistor R11, a ninth resistor R8, a tenth resistor R10 and a fifth capacitor C8, the sixth resistor R12 and the seventh resistor R9 are connected in series, the eighth resistor R11 and the ninth resistor R8 are connected in series, a series circuit of the sixth resistor R12 and the seventh resistor R9 is connected in parallel with a series circuit of the eighth resistor R11 and the ninth resistor R8, a common terminal of the sixth resistor R12 and the eighth resistor R11, an input terminal of the strong trigger circuit 21 and an output terminal of the signal amplifying circuit 26 are connected, a common terminal of the seventh resistor R9 and the ninth resistor R8, one terminal of the fifth capacitor C8, one terminal of the tenth resistor R10 and a corresponding gate of the G1 are connected, the fifth capacitor C8 and the tenth capacitor R8 are connected in parallel, and the other terminal of the tenth resistor R8, the fifth thyristor C8 and a corresponding cathode 8 of the fifth thyristor 8 are connected to ground.
In practical application, in order to facilitate users to observe whether the thyristor trigger circuit operates normally or not and further distinguish that part of the circuit operates normally and has faults, an indicating circuit can be added in the trigger pulse circuit and each control circuit for prompting users whether each circuit operates normally or not.
Specifically, the trigger pulse circuit may further include a first indicator circuit 13 connected in series between the output terminal of the first regulated power supply 11 and the ground terminal; the first indicating circuit 13 includes a second resistor R45 and a first light emitting diode D4, one end of the second resistor R45 is connected to the output end of the first regulated power supply 11, the other end of the second resistor R45 is connected to the anode of the first light emitting diode D4, and the cathode of the first light emitting diode D4 is grounded; when the first light emitting diode D4 in the first indicating circuit 13 in the trigger pulse circuit emits light normally, it indicates that the trigger pulse circuit operates normally, and when the first light emitting diode D4 in the first indicating circuit 13 in the trigger pulse circuit does not emit light, it indicates that the trigger pulse circuit is faulty.
Specifically, each control circuit may further include a second indicating circuit 22; the second indicating circuit 22 comprises a third resistor R5 and a second light emitting diode D1, one end of the third resistor R5, the output end of the strong trigger circuit 21 and the output end of the steady-state signal output circuit 27 are connected, the other end of the third resistor R5 is connected with one end of the second light emitting diode D1, and the other end of the second light emitting diode D1 is grounded; when the second light emitting diode D1 in the second indicator circuit 22 in the control circuit emits light normally, it indicates that the control circuit is operating normally, and when the second light emitting diode D1 in the second indicator circuit 22 in the control circuit does not emit light, it indicates that the control circuit is faulty.
Therefore, a user can quickly judge whether each circuit has faults or not according to the running state of the light-emitting diode.
It can be understood that the specific model and specification of each circuit component in the embodiment of the present invention are not limited, and can be set according to the actual needs of the user.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The present invention provides a thyristor trigger circuit, and a principle and an implementation of the present invention are explained herein by using a specific example, and the description of the above embodiment is only used to help understand the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (9)
1. A thyristor trigger circuit, comprising: the trigger pulse circuit, the end plate circuit and the n thyristors are connected in series; the trigger pulse circuit comprises a first stabilized voltage power supply, a first current-limiting resistor, a second current-limiting resistor, n output units and an input unit which are connected with each other, wherein the input end of the first stabilized voltage power supply is connected with a direct-current power supply, the output end of the first stabilized voltage power supply, one end of the first current-limiting resistor and one end of the second current-limiting resistor are connected with the second end of the input unit, the other end of the first current-limiting resistor is connected with the first end of the first output unit, and the other end of the second current-limiting resistor and the second end of the nth output unit are connected with the first end of the input unit; the last-stage board circuit comprises n control circuits, the input end of each control circuit is respectively connected with the corresponding output unit, and the output end of each control circuit is respectively connected with the corresponding thyristor;
each output unit comprises a first capacitor and a first optocoupler, the first capacitor is connected with a light emitting diode of the first optocoupler in parallel, the anode of the light emitting diode is used as the first end of the output unit, the cathode of the light emitting diode is used as the second end of the output unit, each output unit is connected in series, and the second end of the previous output unit is connected with the first end of the next output unit; each control circuit comprises a strong trigger circuit, and n is a positive integer;
the strong trigger circuit comprises a first energy storage capacitor, a second energy storage capacitor and a first resistor, wherein the first energy storage capacitor is connected with the second energy storage capacitor in parallel, the first end of the first resistor, the first end of the first energy storage capacitor and the first end of the second energy storage capacitor are connected with each other, the second end of the first resistor is used as the input end of the strong trigger circuit, and the second end of the first energy storage capacitor is used as the output end of the strong trigger circuit;
the n output units connected in series convert pulse signals in the form of electric signals into pulse signals in the form of optical signals, output the pulse signals in the form of optical signals to corresponding n control circuits in the final stage board circuit, and the series trigger pulse circuit is adopted to enable the time difference of the input optical signals after light splitting to be less than or equal to 40 ns.
2. The thyristor trigger circuit according to claim 1, wherein the input unit comprises a second capacitor and a second optocoupler, one end of the second capacitor, a second end of the second optocoupler and a fourth end of the second optocoupler are grounded, the other end of the second capacitor, a third end of the second optocoupler and an output end of the first regulated power supply are connected, a first end of the second optocoupler serves as the first end of the input unit, and a third end of the second optocoupler serves as the second end of the input unit.
3. The thyristor trigger circuit according to claim 1, wherein the first regulated power supply comprises a three-terminal regulator tube, a first voltage-dividing resistor and a second voltage-dividing resistor, an input terminal of the three-terminal regulator tube is connected to the dc power supply, an output terminal of the three-terminal regulator tube is connected to one terminal of the first voltage-dividing resistor, the other terminal of the first voltage-dividing resistor is connected to one segment of the second voltage-dividing resistor, the other terminal of the second voltage-dividing resistor is grounded, a third terminal of the three-terminal regulator tube is connected between the first voltage-dividing resistor and the second voltage-dividing resistor, an input terminal of the three-terminal regulator tube serves as an input terminal of the first regulated power supply, and an output terminal of the three-terminal regulator tube serves as an output terminal of the first regulated power supply.
4. The thyristor trigger circuit of claim 1, wherein the trigger pulse circuit further comprises a first indicator circuit connected in series between the output terminal of the first regulated power supply and ground; the first indicating circuit comprises a second resistor and a first light emitting diode, one end of the second resistor is connected with the output end of the first voltage stabilizing power supply, the other end of the second resistor is connected with the anode of the first light emitting diode, and the cathode of the first light emitting diode is grounded.
5. A thyristor trigger circuit according to any one of claims 1 to 4, wherein each of the n control circuits comprises a bridge rectifier module, an AC power input interface, a rectifier filter circuit, a second regulated power supply, a photoelectric conversion unit, a signal amplification circuit and a steady-state signal output circuit which are connected in sequence; the alternating current power supply input interface, the bridge rectifier module and the rectifier filter circuit are sequentially connected in series, a first end of the signal amplification circuit is connected with a first end of the photoelectric conversion unit, a second end of the signal amplification circuit, an output end of the rectifier filter circuit and an input end of a second stabilized voltage power supply are connected, a third end of the signal amplification circuit, an input end of the strong trigger circuit and an input end of the steady-state signal output circuit are connected, an output end of the second stabilized voltage power supply is connected with a second end of the photoelectric conversion unit, the photoelectric conversion unit is connected with a corresponding output unit in the trigger pulse circuit, an output end of the strong trigger circuit is connected with an output end of the steady-state signal output circuit, and a third end of the steady-state signal output circuit is grounded.
6. The thyristor triggered circuit of claim 5, wherein each of the control circuits further comprises a second indicator circuit; the second indicating circuit comprises a third resistor and a second light emitting diode, one end of the third resistor, the output end of the strong trigger circuit and the output end of the steady-state signal output circuit are connected, the other end of the third resistor is connected with one end of the second light emitting diode, and the other end of the second light emitting diode is grounded.
7. The thyristor trigger circuit of claim 5, wherein the photoelectric conversion unit comprises a third capacitor and a third optocoupler; one end of the third capacitor is grounded with the second end of the third optocoupler, the other end of the third capacitor, the third end of the third optocoupler and the output end of the second voltage-stabilized power supply are connected, the fourth end of the third optocoupler is grounded, and the first end of the third optocoupler is connected with the first end of the amplifying circuit.
8. The thyristor triggered circuit of claim 7, wherein the signal amplification circuit comprises an amplification element, a fourth resistor, a fifth resistor, and a fourth capacitor; the first end of the amplifying element, one end of the fourth resistor and one end of the fifth resistor are connected, the second end of the amplifying element, the output end of the rectifying and filtering circuit and the third end of the second stabilized voltage power supply are connected, the third end of the amplifying element, the input end of the strong trigger circuit and the input end of the steady-state signal output circuit are connected, one end of the fourth capacitor is connected with the input end of the second stabilized voltage power supply, and the other end of the fourth capacitor is connected with the first end of the amplifying element.
9. The thyristor trigger circuit of claim 8, wherein the steady-state signal output circuit comprises a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, and a fifth capacitor, the sixth resistor and the seventh resistor are connected in series, the eighth resistor and the ninth resistor are connected in series, the series circuit of the sixth resistor and the seventh resistor and the series circuit of the eighth resistor and the ninth resistor are connected in parallel with each other, a common terminal of the sixth resistor and the eighth resistor, an input terminal of the strong trigger circuit, and an output terminal of the signal amplification circuit are connected, a common terminal of the seventh resistor and the ninth resistor, a terminal of the fifth capacitor, and a terminal of the tenth resistor are connected, and the fifth capacitor and the tenth resistor are connected in parallel.
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