CN218335983U - Trigger circuit for coupling drive signal of current transformer - Google Patents
Trigger circuit for coupling drive signal of current transformer Download PDFInfo
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- CN218335983U CN218335983U CN202222474470.4U CN202222474470U CN218335983U CN 218335983 U CN218335983 U CN 218335983U CN 202222474470 U CN202222474470 U CN 202222474470U CN 218335983 U CN218335983 U CN 218335983U
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Abstract
The utility model discloses a trigger circuit of current transformer coupling drive signal, including drive signal generating circuit and trigger pulse output circuit, trigger pulse output circuit includes current-limiting resistor R11, switch tube V3, diode V4, resistance R12 and a plurality of current transformer Tan, drive signal generating circuit output drive signal, it is connected to the G utmost point of switch tube V3 through current-limiting resistor R11, and the C utmost point of switch tube V3 is connected to the positive pole of diode V4 through resistance R12, and high voltage power supply is connected to diode V4's negative pole; the E pole of the switching tube V3 is grounded; and a wiring terminal is led out of the negative electrode of the diode V4 and is connected to the C electrode of the switching tube V3 through a lead, a plurality of current transformers are coupled on the lead, and the output end of each current transformer is used as the output end of the trigger signal to output the trigger signal. The utility model discloses simple structure, stable performance can export multichannel tributary pulse trigger signal.
Description
Technical Field
The utility model relates to a switch work trigger control field, in particular to current transformer coupling drive signal's trigger circuit.
Background
With the continuous development and progress of semiconductor device processing materials and manufacturing processes, the application of replacing a vacuum tube switch by a switch assembly formed by a semiconductor device is gradually widened. The switch assembly formed by the semiconductor devices is realized by adopting a series-parallel connection mode of a plurality of semiconductor switch tubes, and in order to effectively solve the problems of synchronism and potential isolation of trigger signals of a plurality of series-parallel switch tubes, the trigger signals can realize synchronous triggering of the plurality of switch tubes and electrical isolation of a high-voltage circuit and a low-voltage circuit by adopting an optical fiber transmission mode or a current pulse coupling mode, and can effectively inhibit interference of the outside on the trigger signals.
In the field of pulse power application, because charging and discharging of high voltage and large current of a system require that a plurality of groups of switches are connected in series to work, the driving power of a trigger driving signal needs to be correspondingly improved, and meanwhile, the capability of quickly conducting an IGBT (insulated gate bipolar translator) or other switching tubes is required. At the same time. The charging and discharging process of the system may also generate strong light and strong electromagnetic interference signals, which may affect both the low-voltage control circuit and the electronic components, and may cause malfunction of the devices or damage the devices under severe conditions, thereby causing abnormal operation of the system. How to realize the synchronous trigger control of the multi-way switch is the problem that the trigger circuit needs to consider, the trigger circuit in the prior art cannot realize accurate and anti-interference output of multi-way trigger signals to realize the drive of the switch, and cannot meet the requirement on the synchronous trigger control.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's not enough, provide a current transformer coupling drive signal's trigger circuit for output reliable and stable, can suppress interference, multichannel trigger signal.
In order to realize the purpose, the utility model discloses a technical scheme be: a trigger circuit of a current transformer coupling drive signal comprises a drive signal generating circuit and a trigger pulse output circuit, wherein the trigger pulse output circuit comprises a current-limiting resistor R11, a switching tube V3, a diode V4, a resistor R12 and a plurality of current transformers Tan, the drive signal generating circuit outputs a drive signal which is connected to a G pole of the switching tube V3 through the current-limiting resistor R11, a C pole of the switching tube V3 is connected to an anode of the diode V4 through the resistor R12, and a cathode of the diode V4 is connected with a high-voltage power supply; the E pole of the switch tube V3 is grounded; and a wiring terminal is led out of the negative electrode of the diode V4 and is connected to the C electrode of the switching tube V3 through a lead, a plurality of current transformers are coupled on the lead, and the output end of each current transformer is used as the output end of the trigger signal to output the trigger signal.
The driving signal generating circuit comprises a signal trigger isolating circuit, a first pulse shaping circuit, a second pulse shaping circuit and a signal amplifying circuit, wherein an external synchronous signal is input into the input end of the signal trigger isolating circuit, the output end of the signal trigger isolating circuit is connected with the first pulse shaping circuit, the output end of the first pulse shaping circuit is connected to the input end of the signal amplifying circuit through the second pulse shaping circuit, and the signal amplifying circuit outputs a driving signal after isolation and amplification to the trigger pulse output circuit.
The signal trigger isolation circuit isolates an external synchronous signal through an optocoupler and outputs the isolated external synchronous signal to the first pulse shaping circuit.
The first pulse shaping circuit adopts a monostable trigger N2 to shape the pulse signal, and the output end of the first pulse shaping circuit is connected to the second pulse shaping circuit.
The AND gate input end of the monostable trigger N2 is connected with the high-voltage power supply interlocking circuit; the high-voltage power supply interlocking circuit is used for outputting a corresponding level signal to the monostable trigger according to the state of the high-voltage power supply.
The high-voltage power supply interlocking circuit comprises a high-voltage power supply which is grounded through resistors R6 and R7 which are connected in series; a leading-out terminal between the resistors R6 and R7 is connected to a base electrode of the triode V2, a collector electrode of the triode V2 is connected to + VCC through the resistor R5, and an emitting electrode of the triode V is grounded; the leading-out terminal of the collector electrode of the V2 is connected to the base electrode of the triode V1, the emitter electrode of the V1 is grounded, the collector electrode of the V1 is connected with + VCC through a resistor R4, and the leading-out terminal between the collector electrode of the triode V1 and the resistor R4 is used as the output end of the high-voltage power supply interlocking circuit.
The second pulse shaping circuit comprises monostable triggers N3A and N3B, wherein the output end of the monostable trigger N3A is respectively connected to the input end of the signal amplification circuit and the input end of the monostable trigger N3B, and the output end of the monostable trigger N3B is connected to the AND gate input end of the monostable trigger N3A to form linkage.
The high voltage power supply comprises a transformer T, and the secondary side of the transformer is provided with three windings: the direct current positive pole that winding T1 formed after full-bridge rectification is connected to the C of switch tube V3 through electric capacity L1, its negative pole is connected to the positive pole that winding T2 formed after full-bridge rectification through resistance R15, the positive pole that winding T2 formed after full-bridge rectification draws forth high voltage power supply positive pole, high voltage power supply positive pole is connected to the negative pole that winding T2 formed after full-bridge rectification through electric capacity C4, this negative pole is connected to the positive pole of the 30V power that winding T3 formed through full-bridge rectification, the positive pole of the 30V power is earthed after the resistance R13, R14 that establish ties, the steady voltage controller drives the input side power supply of control transformer T through gathering the voltage signal between resistance R13, R14 with stable voltage output.
The utility model has the advantages that: the structure is simple, the performance is stable, and a multi-channel branch pulse trigger signal can be output to complete the conduction and synchronization of a plurality of switching tubes; the circuit is provided with the work of interlocking, demagnetization and the like, so that the stability, reliability and effectiveness of the circuit are ensured, and the circuit is completely suitable for synchronous triggering of multiple switch tubes.
Drawings
The contents of the expressions in the various figures of the present specification and the labels in the figures are briefly described as follows:
FIG. 1 is a schematic block diagram of the circuit of the present invention;
FIG. 2 is a schematic diagram of the circuit of the present invention;
fig. 3 is a schematic diagram of the power supply of the present invention.
Detailed Description
The following description of preferred embodiments of the invention will be made in further detail with reference to the accompanying drawings.
The embodiment mainly realizes a new trigger circuit to solve the problems that the trigger signal is easily interfered, the driving capability is insufficient and the work is unreliable. The trigger circuit of the current transformer coupling driving signal comprises a trigger signal isolation circuit, a pulse shaping circuit, a signal amplification circuit, a signal interlocking circuit, a trigger voltage interlocking circuit, an alternating current-direct current conversion circuit, a voltage stabilizing circuit, a voltage transformation circuit, a trigger pulse output circuit and a demagnetization circuit.
The trigger signal isolation circuit is connected to the pulse shaping circuit after receiving an external trigger pulse signal for isolation, and an output signal of the pulse shaping circuit is connected with the signal amplification circuit to realize the drive current amplification of the trigger signal and then provide drive for the conduction of a rear IGBT switch.
The alternating current-direct current conversion circuit converts alternating current commercial power 220V into direct current high voltage, converts the direct current voltage into the required direct current high voltage of +200V and direct current voltage of +30V through the direct current voltage stabilizing circuit and the voltage transformation circuit, and provides demagnetized direct current level for a magnetic core for performing isolation conversion on the trigger signal.
The voltage detection circuit detects the +200V voltage, the output of the detection circuit is connected to the pulse shaping circuit, and the output of the detection circuit and an external trigger signal are subjected to AND gate, so that the synchronous signal interlocking function is realized.
The demagnetization circuit is connected to one end of the trigger pulse output, when the trigger pulse is finished, the demagnetization level demagnetizes the magnetic core through the magnetic core loop of the trigger signal isolation conversion, and the phenomenon that the magnetic core is saturated cannot occur under high trigger frequency.
By adopting the circuit implementation form, the problem of strong electromagnetic interference on a low-voltage control circuit caused by the high-voltage and high-current charging and discharging working process in a pulse power system is effectively solved, the voltage amplitude of a driving signal and the rapid rise of the front edge of a trigger signal are improved, the reliability of low-voltage signal transmission is ensured, the stability of the system is improved, and the anti-interference requirement of the system is met. The specific circuit is introduced as follows:
as shown in fig. 1, 2, and 3, a trigger circuit for coupling a driving signal with a current transformer includes a driving signal generating circuit and a trigger pulse output circuit, where the trigger pulse output circuit includes a current limiting resistor R11, a switching tube V3, a diode V4, a resistor R12, and a plurality of current transformers Tan, the driving signal generating circuit outputs a driving signal, which is connected to a G pole of the switching tube V3 through the current limiting resistor R11, a C pole of the switching tube V3 is connected to an anode of the diode V4 through the resistor R12, and a cathode of the diode V4 is connected to a high-voltage power supply; the E pole of the switch tube V3 is grounded; and a wiring terminal is led out of the negative electrode of the diode V4 and is connected to the C electrode of the switching tube V3 through a lead, a plurality of current transformers are coupled on the lead, and the output end of each current transformer is used as the output end of the trigger signal to output the trigger signal.
The driving signal generating circuit comprises a signal trigger isolating circuit, a first pulse shaping circuit, a second pulse shaping circuit and a signal amplifying circuit, wherein an external synchronous signal is input into the input end of the signal trigger isolating circuit, the output end of the signal trigger isolating circuit is connected with the first pulse shaping circuit, the output end of the first pulse shaping circuit is connected to the input end of the signal amplifying circuit through the second pulse shaping circuit, and the signal amplifying circuit outputs a driving signal subjected to isolation amplification to the trigger pulse output circuit.
The signal triggering isolation circuit isolates the external synchronous signal through the optocoupler and outputs the isolated external synchronous signal to the first pulse shaping circuit.
The first pulse shaping circuit adopts a monostable trigger N2 to shape the pulse signal, and the output end of the first pulse shaping circuit is connected to the second pulse shaping circuit.
The AND gate input end of the monostable trigger N2 is connected with the high-voltage power supply interlocking circuit; the high-voltage power supply interlocking circuit is used for outputting a corresponding level signal to the monostable trigger according to the state of the high-voltage power supply.
The high-voltage power supply interlocking circuit comprises a high-voltage power supply which is grounded through resistors R6 and R7 connected in series; a terminal is led out between the resistors R6 and R7 and is connected to the base electrode of the triode V2, the collector electrode of the triode V2 is connected to + VCC through the resistor R5, and the emitter electrode of the triode V is grounded; the leading-out terminal of the collector electrode of the V2 is connected to the base electrode of the triode V1, the emitter electrode of the V1 is grounded, the collector electrode of the V1 is connected with + VCC through a resistor R4, and the leading-out terminal between the collector electrode of the triode V1 and the resistor R4 is used as the output end of the high-voltage power supply interlocking circuit.
The second pulse shaping circuit comprises monostable triggers N3A and N3B, wherein the output end of the monostable trigger N3A is respectively connected to the input end of the signal amplification circuit and the input end of the monostable trigger N3B, and the output end of the monostable trigger N3B is connected to the AND gate input end of the monostable trigger N3A to form linkage.
The high voltage power supply comprises a transformer T, the secondary side of which is provided with three windings: the direct current positive pole that winding T1 formed after full-bridge rectification is connected to the C of switch tube V3 through electric capacity L1, its negative pole is connected to the positive pole that winding T2 formed after full-bridge rectification through resistance R15, the positive pole that winding T2 formed after full-bridge rectification draws forth high voltage power supply positive pole, high voltage power supply positive pole is connected to the negative pole that winding T2 formed after full-bridge rectification through electric capacity C4, this negative pole is connected to the positive pole of the 30V power that winding T3 formed through full-bridge rectification, the positive pole of the 30V power is earthed after the resistance R13, R14 that establish ties, the steady voltage controller drives the input side power supply of control transformer T through gathering the voltage signal between resistance R13, R14 with stable voltage output.
The external synchronous signal is isolated by an isolation circuit N1 and sent to a pulse shaping circuit 1, the pulse shaping circuit shapes according to the input pulse signal, and the shaped signal is shaped again by an N3. Meanwhile, the N3:9 pulse signal and the N2:9 pulse signal phase are output-linked as an N3:6 pulse signal. After the shaped pulse signal is processed by the isolation amplification driving chip, a new driving signal is connected to the G pole of the IGBT switch V3 through a resistor R11 and serves as a driving signal of the IGBT switch V3. When V3 is switched on, +200V carries out rapid discharge through an external current transformer coupling circuit TA1 \8230, TAN then passes through a V3: CE-ground loop, and a direct-current power supply of +30V maintains the voltage flat top of a trigger signal; when V3 is turned off, L1 passes through Tan \8230andTA 1 charges +200V, and at the moment, the external current transformer coupling circuit can generate a small current signal in the direction opposite to the current direction of the trigger signal, so that the effect of demagnetizing an internal iron core of the external current transformer is achieved.
The alternating current-direct current conversion circuit rectifies alternating current through a V1 full-bridge rectifier and then discharges electricity through an IGBT (insulated gate bipolar transistor), alternating current transformation is completed through T1, three windings with different transformation ratios on the secondary side of a T1 transformer respectively convert the alternating current into required direct current levels through full-bridge rectification and filtering. The output direct current voltage is sampled, and the power supply controller is used as the control feedback of the alternating current-direct current conversion circuit, so that the effect of outputting a voltage-stabilizing direct current level by the rectification circuit is achieved.
Fig. 2 and 3 are schematic diagrams of the trigger circuit. The external trigger control signal is isolated by N1 and sent to N2:11 of the pulse shaping circuit 1. Meanwhile, a level signal output by the +200V voltage detection circuit is connected to N2:13 and an N2:11 level AND gate is used as a condition for outputting N2:9 pulses. The pulse waveform output by the N2:9 is sent to the N3:5, one path of the pulse waveform output by the N3:6 is sent to the isolation drive amplifier N4, wherein the resistor R8 and the capacitor C2 form a peripheral circuit of the monostable trigger N3 so as to control the 6 output pulse signal width of the monostable circuit N3, and the pulse signal width can adjust the parameter values of the resistor R8 and the capacitor C2 according to actual working requirements. The pulse signals output by the N3:6 input the N3:11 for reshaping again, the N3:9 output interlocking signal and the pulse signal AND gate of the N2:9 are used as the output interlocking of the N3:6 pulse signals, and the phenomenon that the N3:6 pins receive interference to cause circuit false triggering action is prevented. And N3:6 is connected with N4:2 and 4, and the drive signal subjected to isolation amplification is output in parallel through N4:5 and 7 and is connected to the G pole of the IGBT switch V3 through a current limiting resistor R11 to serve as a drive signal for turning on the V3. When V3 is on, +200V carries out fast discharge through external current transformer coupling circuit TA1 \8230, TAN then passes through the V3: CE-ground loop, so that the external current transformer couples a pulse front edge with a higher voltage regulation rate. Because an energy storage capacitor with a small capacitance value is connected in series between the +200V and the ground, the energy on the capacitor is quickly discharged, and at the moment, the +30V direct-current power supply continuously charges the capacitor, so that the effect of maintaining the flat top of the voltage of the trigger signal is achieved; when V3 is turned off, L1 triggers output power to pass through TAN \8230andTA 1 charges +200V, and at the moment, the external current transformer coupling circuit can generate a current signal with the current direction opposite to that of the trigger signal, so that the effect of demagnetizing an internal iron core of the external current transformer is achieved.
The alternating current-direct current conversion circuit rectifies alternating current through V1 full-bridge rectification, discharges electricity through IGBT and completes alternating current transformation through T1, three windings of different voltage outputs of a secondary stage of the T1 transformer respectively perform full-bridge rectification again, and respective alternating current signals are converted into required direct current levels. The voltage sampling is carried out on one end of the R14 in the direct-current voltage loop, the voltage is sent to the power supply controller, the driving pulse is output, the IGBT is switched on after the driving pulse signal is amplified and isolated by the isolation driving amplifier, and the driving signal is provided, so that the purpose of controlling the stability of three paths of direct-current output voltages is achieved. The voltage at one end of the R14 (the section connected with the R13) resistor is taken as the level input of the power controller, when the resistance value of the R14 is changed, the voltage amplitude of the sampling level is correspondingly changed, and the change of the sampling level can cause the driving frequency of the IGBT output by the power controller to follow the regular change, so that the rectified direct current level is stably output.
It is clear that the specific implementation of the invention is not restricted to the above-described embodiments, but that various insubstantial modifications of the inventive process concept and technical solutions are within the scope of protection of the invention.
Claims (8)
1. A trigger circuit of current transformer coupling drive signal which characterized in that: the trigger pulse output circuit comprises a current-limiting resistor R11, a switching tube V3, a diode V4, a resistor R12 and a plurality of current transformers Tan, wherein the driving signal generation circuit outputs a driving signal which is connected to a G pole of the switching tube V3 through the current-limiting resistor R11, a C pole of the switching tube V3 is connected to an anode of the diode V4 through the resistor R12, and a cathode of the diode V4 is connected with a high-voltage power supply; the E pole of the switch tube V3 is grounded; and a wiring terminal is led out of the negative electrode of the diode V4 and is connected to the C electrode of the switching tube V3 through a lead, a plurality of current transformers are coupled on the lead, and the output end of each current transformer is used as the output end of the trigger signal to output the trigger signal.
2. A current transformer drive signal coupling triggering circuit as recited in claim 1, wherein: the driving signal generating circuit comprises a signal trigger isolating circuit, a first pulse shaping circuit, a second pulse shaping circuit and a signal amplifying circuit, wherein an external synchronous signal is input into the input end of the signal trigger isolating circuit, the output end of the signal trigger isolating circuit is connected with the first pulse shaping circuit, the output end of the first pulse shaping circuit is connected to the input end of the signal amplifying circuit through the second pulse shaping circuit, and the signal amplifying circuit outputs a driving signal after isolation and amplification to the trigger pulse output circuit.
3. A current transformer drive signal coupling triggering circuit as recited in claim 2, wherein: and the signal trigger isolation circuit isolates an external synchronous signal through an optocoupler and outputs the isolated external synchronous signal to the first pulse shaping circuit.
4. A current transformer drive signal coupling triggering circuit as recited in claim 2, wherein: the first pulse shaping circuit adopts a monostable trigger N2 to shape a pulse signal, and the output end of the first pulse shaping circuit is connected to the second pulse shaping circuit.
5. The trigger circuit of claim 4, wherein the current transformer couples the driving signal, and further comprising: the AND gate input end of the monostable trigger N2 is connected with the high-voltage power supply interlocking circuit; the high-voltage power supply interlocking circuit is used for outputting a corresponding level signal to the monostable trigger according to the state of the high-voltage power supply.
6. The trigger circuit of claim 5, wherein the current transformer couples the driving signal, and further comprising: the high-voltage power supply interlocking circuit comprises a high-voltage power supply which is grounded through resistors R6 and R7 which are connected in series; a terminal is led out between the resistors R6 and R7 and is connected to the base electrode of the triode V2, the collector electrode of the triode V2 is connected to + VCC through the resistor R5, and the emitter electrode of the triode V is grounded; the leading-out terminal of the collector of the V2 is connected to the base electrode of the triode V1, the emitter of the V1 is grounded, the collector of the V1 is connected with + VCC through a resistor R4, and the leading-out terminal between the collector of the triode V1 and the resistor R4 is used as the output end of the high-voltage power supply interlocking circuit.
7. A current transformer drive signal coupling triggering circuit as recited in claim 2, wherein: the second pulse shaping circuit comprises monostable triggers N3A and N3B, wherein the output end of the monostable trigger N3A is respectively connected to the input end of the signal amplification circuit and the input end of the monostable trigger N3B, and the output end of the monostable trigger N3B is connected to the AND gate input end of the monostable trigger N3A to form linkage.
8. A triggering circuit for coupling a driving signal to a current transformer as claimed in claim 1 or 2, wherein: the high voltage power supply comprises a transformer T, and the secondary side of the transformer is provided with three windings: the direct current positive pole that winding T1 formed after full-bridge rectification is connected to the C of switch tube V3 through electric capacity L1, its negative pole is connected to the positive pole that winding T2 formed after full-bridge rectification through resistance R15, the positive pole that winding T2 formed after full-bridge rectification draws forth high voltage power supply positive pole, high voltage power supply positive pole is connected to the negative pole that winding T2 formed after full-bridge rectification through electric capacity C4, this negative pole is connected to the positive pole of the 30V power that winding T3 formed through full-bridge rectification, the positive pole of the 30V power is earthed after the resistance R13, R14 that establish ties, the steady voltage controller drives the input side power supply of control transformer T through gathering the voltage signal between resistance R13, R14 with stable voltage output.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222474470.4U CN218335983U (en) | 2022-09-19 | 2022-09-19 | Trigger circuit for coupling drive signal of current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222474470.4U CN218335983U (en) | 2022-09-19 | 2022-09-19 | Trigger circuit for coupling drive signal of current transformer |
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| CN218335983U true CN218335983U (en) | 2023-01-17 |
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| CN202222474470.4U Active CN218335983U (en) | 2022-09-19 | 2022-09-19 | Trigger circuit for coupling drive signal of current transformer |
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