CN220067214U - Intermediate frequency inversion modulation pulse trigger circuit - Google Patents
Intermediate frequency inversion modulation pulse trigger circuit Download PDFInfo
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- CN220067214U CN220067214U CN202320536130.1U CN202320536130U CN220067214U CN 220067214 U CN220067214 U CN 220067214U CN 202320536130 U CN202320536130 U CN 202320536130U CN 220067214 U CN220067214 U CN 220067214U
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Abstract
The intermediate frequency inversion modulation pulse trigger circuit is characterized in that the modulation pulse is changed into a plurality of pulses through an isolation loop, an electronic switch loop, a square wave modulation loop, a power amplification loop and a pulse shaping loop, so that the size of an isolation transformer T1 is reduced, the strength of the trigger pulse is improved, the whole working condition and abnormal conditions are not problematic, the trigger pulse normally works under high current, the pulse part is not influenced, and the undershoot caused by the adoption of the single pulse is avoided.
Description
Technical Field
The utility model relates to the technical field of intermediate frequency induction power supplies, in particular to an intermediate frequency inversion modulation pulse trigger circuit.
Background
As known, an intermediate frequency power supply is a static frequency conversion device, which can convert a three-phase power frequency power supply into a single-phase power supply, and the process of converting alternating current into direct current by the power supply needs to perform inversion of the current, and the proper start of the inversion needs to be triggered by an inversion pulse;
the existing inversion pulse triggering mode of the high-power intermediate-frequency power supply generally adopts a single pulse triggering mode, the mode can cause the weight and the volume of the power supply to be overlarge, in addition, the single pulse triggering mode also has the problem that the thyristor is not sufficiently conducted due to insufficient triggering power, and further, the thyristor, the power supply and the circuit triggered by the intermediate-frequency power supply pulse are damaged to cause great loss;
therefore, in view of the above, there is a need in the market for a modulation pulse trigger circuit that can meet the requirement that the thyristor is fully turned on and can reduce the weight and volume of the intermediate frequency power supply.
Disclosure of Invention
In order to overcome the defects in the background technology, the utility model discloses an intermediate frequency inversion modulation pulse trigger circuit.
In order to achieve the aim of the utility model, the utility model adopts the following technical scheme:
an intermediate frequency inversion modulation pulse trigger circuit comprises an isolation loop, an electronic switch loop, a square wave modulation loop, a power amplification loop and a pulse shaping loop; the isolation loop can carry out photoelectric isolation on the inversion pulse signals;
the electronic switching circuit can be switched on and off according to the width of the inversion pulse signal;
the square wave modulation loop can enable the high-frequency oscillation frequency square wave generator inside the square wave modulation loop to work according to the width of the inversion pulse signal;
the power amplification circuit can drive the transformer T1 and the pulse shaping circuit to work by using the inversion pulse signal;
the pulse shaping loop can shape the inversion pulse signal, so that the shaped inversion pulse signal is connected to the inversion thyristor.
Preferably, the signal isolation loop comprises a resistor R1, a resistor R2 and an optocoupler U1; one end of a resistor R1 is connected with impedance voltage of the inversion pulse signal, the other end of the resistor R1 is connected with one end of a resistor R2 and the negative electrode of an optical coupler U1 respectively, the other end of the resistor R2 is connected with rated voltage of the inversion pulse signal source and the positive electrode of the optical coupler U1 respectively, and the C electrode and the E electrode of the optical coupler U1 are connected with an electronic switch loop.
Preferably, the electronic switching circuit comprises a resistor R3, a resistor R4, a resistor R5 and a triode Q1; one end of a resistor R4 is connected with a C pole of the thermocouple U1, the other end of the resistor R4 is respectively connected with one end of a resistor R3 and a base electrode of a triode Q1, the other end of the resistor R3 is connected with an emitter electrode of the triode Q1 and a 15V power supply, a collector electrode of the triode Q1 is respectively connected with one end of a resistor R5 and a square wave modulation loop, and the other end of the resistor R5 is connected with an E pole of the thermocouple U1 and a ground wire.
Preferably, the square wave modulation loop comprises an integrated loop U2, a capacitor C1 and a resistor R6; the first pin of the integrated circuit U2 is connected with the emitter of the triode Q1, the second pin and the third pin of the integrated circuit U2 are connected with one ends of a capacitor C1 and a resistor R6, the other end of the capacitor C1 and the fourth pin of the integrated circuit U2 are connected with a ground wire, the fifth pin of the integrated circuit U2 and the other end of the capacitor R6 are connected with a power amplification circuit, and the sixth pin of the integrated circuit U2 is connected with 15V power supply.
Preferably, the power amplification loop comprises a resistor R7, a resistor R8, a resistor R9, a triode Q2, a triode Q3 and a triode Q4; one end of a resistor R7 is connected with a fifth pin of the integrated circuit U2 and a resistor R6 respectively, the other end of the resistor R7 is connected with bases of a triode Q2 and a triode Q3 respectively, a collector of the triode Q2 is connected with a 15V power supply, a collector of the triode Q3 is connected with a ground wire, an emitter of the triode Q2 and an emitter of the triode Q3 are connected with one end of the resistor R3, the other end of the resistor R3 is connected with a resistor R9 and a grid electrode of a MOS tube Q4 respectively, the other end of the resistor R9 and a source electrode of the MOS tube Q4 are connected with the ground wire, and a drain electrode of the MOS tube Q4 is connected with a transformer T1 and a pulse shaping circuit.
Preferably, the pulse shaping circuit comprises a diode D1, a diode D2, a diode D3, a diode D4, a capacitor C2 and a resistor R10, wherein the anode of the diode D2 is connected with the drain of the MOS transistor Q4 and one end of the winding on one side of the transformer T1 respectively, the cathode of the diode D2 is connected with the cathode of the diode D1, the anode of the diode D1 is connected with the 24V power supply and the other end of the winding on one side of the transformer T1 respectively, the anode of the diode D3 is connected with one end of the winding on the other side of the transformer T1, the resistor R10, the diode D4 and the capacitor C2 are connected in parallel, one end of the resistor R10, the cathode of the diode D4 and one end of the capacitor C2 are connected with the cathode of the diode D3 and the ground electrode of the circuit respectively, and the other end of the resistor R10, the anode of the diode D4 and the other end of the capacitor C2 are connected with the other end of the winding on the other side of the transformer T1 and the key store of the circuit respectively.
Preferably, the primary and secondary windings of the transformer T1 are flattened with a flattened T1 transformer T1 core.
Preferably, the primary winding of the transformer T1 is a secondary 20-turn winding formed by a primary 30-turn high voltage wire.
Preferably, the high-frequency core inside the transformer T1 is a special ferrite core.
Due to the adoption of the technical scheme, the utility model has the following beneficial effects:
according to the intermediate frequency inversion modulation pulse trigger circuit disclosed by the utility model, the single pulse is changed into a plurality of pulses through the modulation pulse, so that the size of the isolation transformer T1 is reduced, the strength of the trigger pulse is improved, the whole working condition and abnormal conditions are not problematic, the intermediate frequency inversion modulation pulse trigger circuit works normally under high current, the pulse part is not influenced, and the undershoot caused by the adoption of the single pulse is avoided;
in addition, the transformer T1 adopts a flattened magnetic core and a flattened coil high-voltage wire as a primary secondary coil, so as to reduce the distributed capacitance and leakage inductance of the transformer T1.
Drawings
FIG. 1 is a schematic diagram of a structure of the present utility model;
fig. 2 is a circuit diagram of the present circuit.
In the figure: 1. an isolation loop; 2. an electronic switching circuit; 3. a square wave modulation loop; 4. a power amplification loop; 5. a transformer; 6. a pulse shaping loop.
Description of the embodiments
In the description, it should be understood that, if there is an azimuth or positional relationship indicated by terms such as "upper", "lower", "front", "rear", "left", "right", etc., the drawings merely correspond to the drawings of the present utility model, and in order to facilitate description of the present utility model, it is not indicated or implied that the device or element referred to must have a specific azimuth:
the intermediate frequency inversion modulation pulse trigger circuit comprises an isolation loop 1, an electronic switch loop 2, a square wave modulation loop 3, a power amplification loop 4 and a pulse shaping loop 6, wherein the intermediate frequency inversion modulation pulse trigger circuit is described with reference to figures 1-2; the isolation loop 1 can carry out photoelectric isolation on the inversion pulse signals;
the electronic switching circuit 2 is capable of performing switching on and off in accordance with an inversion pulse signal width;
the square wave modulation loop 3 can enable the high-frequency oscillation frequency square wave generator inside the square wave modulation loop to work according to the width of the inversion pulse signal;
the power amplification circuit 4 can drive the inverter pulse signal driving transformer T15 and the pulse shaping circuit to work;
the pulse shaping circuit 6 can shape the inversion pulse signal, so that the shaped inversion pulse signal is connected to the inversion thyristor;
the modulating pulse of the circuit changes the single pulse into a plurality of pulses, thereby reducing the volume of the isolation transformer, improving the intensity of the triggering pulse, ensuring that the whole working condition and abnormal conditions are not problematic, normally working under high current, simultaneously not influencing the pulse part and avoiding the undershoot caused by adopting the single pulse.
One embodiment of the circuit is as follows: the signal isolation loop 1 comprises a resistor R1, a resistor R2 and an optical coupler U1; one end of a resistor R1 is connected with impedance voltage of the inversion pulse signal, the other end of the resistor R1 is connected with one end of a resistor R2 and the negative electrode of an optical coupler U1 respectively, the other end of the resistor R2 is connected with rated voltage of the inversion pulse signal source and the positive electrode of the optical coupler U1 respectively, and the C electrode and the E electrode of the optical coupler U1 are connected with an electronic switch loop.
The second embodiment of the circuit is: the electronic switching circuit 2 comprises a resistor R3, a resistor R4, a resistor R5 and a triode Q1; one end of a resistor R4 is connected with a C pole of the thermocouple U1, the other end of the resistor R4 is respectively connected with one end of a resistor R3 and a base electrode of a triode Q1, the other end of the resistor R3 is connected with an emitter electrode of the triode Q1 and a 15V power supply, a collector electrode of the triode Q1 is respectively connected with one end of a resistor R5 and a square wave modulation loop, and the other end of the resistor R5 is connected with an E pole of the thermocouple U1 and a ground wire.
A third embodiment of the present circuit is: the square wave modulation loop 3 comprises an integrated loop U2, a capacitor C1 and a resistor R6; the first pin of the integrated circuit U2 is connected with the emitter of the triode Q1, the second pin and the third pin of the integrated circuit U2 are connected with one ends of a capacitor C1 and a resistor R6, the other end of the capacitor C1 and the fourth pin of the integrated circuit U2 are connected with a ground wire, the fifth pin of the integrated circuit U2 and the other end of the capacitor R6 are connected with a power amplification circuit, and the sixth pin of the integrated circuit U2 is connected with 15V power supply.
A fourth embodiment of the present circuit is: the power amplification circuit 4 comprises a resistor R7, a resistor R8, a resistor R9, a triode Q2, a triode Q3 and a triode Q4; one end of a resistor R7 is connected with a fifth pin of the integrated circuit U2 and a resistor R6 respectively, the other end of the resistor R7 is connected with bases of a triode Q2 and a triode Q3 respectively, a collector of the triode Q2 is connected with a 15V power supply, a collector of the triode Q3 is connected with a ground wire, an emitter of the triode Q2 and an emitter of the triode Q3 are connected with one end of the resistor R3, the other end of the resistor R3 is connected with a resistor R9 and a grid electrode of a MOS tube Q4 respectively, the other end of the resistor R9 and a source electrode of the MOS tube Q4 are connected with the ground wire, and a drain electrode of the MOS tube Q4 is connected with a transformer T15 and a pulse shaping circuit.
A fifth embodiment of the present circuit is: the pulse shaping loop 6 comprises a diode D1, a diode D2, a diode D3, a diode D4, a capacitor C2 and a resistor R10, wherein the anode of the diode D2 is respectively connected with the drain electrode of the MOS tube Q4 and one end of a winding on one side of the transformer T15, the cathode of the diode D2 is connected with the cathode of the diode D1, the anode of the diode D1 is respectively connected with a 24V power supply and the other end of the winding on one side of the transformer T15, the anode of the diode D3 is connected with one end of the winding on the other side of the transformer T15, the resistor R10, the diode D4 and the capacitor C2 are connected in parallel, one end of the resistor R10, one end of the cathode of the diode D4 and one end of the capacitor C2 are respectively connected with the cathode of the diode D3 and the ground electrode of the circuit, and the other end of the resistor R10, the anode of the diode D4 and the other end of the capacitor C2 are respectively connected with the other end of the winding on the other side of the transformer T15 and the key electrode of the store circuit;
in addition, the primary coil and the secondary coil of the transformer T15 are flattened by a flattened T1 transformer magnetic core, so that the interference and the thermal effect caused by the resistance of the distributed capacitance of the transformer to high-energy harmonic waves are reduced; according to the requirement, the primary coil of the transformer T15 is formed into a secondary 20-turn winding by a primary 30-turn high-voltage wire so as to reduce the distributed capacitance and leakage inductance of the transformer; in particular, the high frequency core inside the transformer T15 is a specially made ferrite core.
The utility model has not been described in detail in the prior art, and it is apparent to those skilled in the art that the utility model is not limited to the details of the above-described exemplary embodiments, but that the utility model can be embodied in other specific forms without departing from the spirit or essential characteristics thereof; the present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (9)
1. An intermediate frequency inversion modulation pulse trigger circuit is characterized in that: the device comprises an isolation loop (1), an electronic switch loop (2), a square wave modulation loop (3), a power amplification loop (4), a transformer T1 (5) and a pulse shaping loop (6); the isolation loop (1) can carry out photoelectric isolation on the inversion pulse signals;
the electronic switching circuit (2) can perform switching on and off according to the inversion pulse signal width;
the square wave modulation loop (3) can enable a high-frequency oscillation frequency square wave generator in the square wave modulation loop to work according to the width of an inversion pulse signal;
the power amplification circuit (4) can enable the inversion pulse signal driving transformer T1 (5) and the pulse shaping circuit to work;
the pulse shaping loop (6) can shape the inversion pulse signal, so that the shaped inversion pulse signal is connected to the inversion thyristor.
2. The medium frequency inversion modulation pulse trigger circuit according to claim 1, wherein: the isolation loop (1) comprises a resistor R1, a resistor R2 and an optocoupler U1; one end of a resistor R1 is connected with impedance voltage of the inversion pulse signal, the other end of the resistor R1 is connected with one end of a resistor R2 and the negative electrode of an optical coupler U1 respectively, the other end of the resistor R2 is connected with rated voltage of the inversion pulse signal source and the positive electrode of the optical coupler U1 respectively, and the C electrode and the E electrode of the optical coupler U1 are connected with an electronic switch loop.
3. The medium frequency inversion modulation pulse trigger circuit according to claim 1, wherein: the electronic switching circuit (2) comprises a resistor R3, a resistor R4, a resistor R5 and a triode Q1; one end of a resistor R4 is connected with a C pole of the thermocouple U1, the other end of the resistor R4 is respectively connected with one end of a resistor R3 and a base electrode of a triode Q1, the other end of the resistor R3 is connected with an emitter electrode of the triode Q1 and a 15V power supply, a collector electrode of the triode Q1 is respectively connected with one end of a resistor R5 and a square wave modulation loop, and the other end of the resistor R5 is connected with an E pole of the thermocouple U1 and a ground wire.
4. The medium frequency inversion modulation pulse trigger circuit according to claim 1, wherein: the square wave modulation loop (3) comprises an integrated loop U2, a capacitor C1 and a resistor R6; the first pin of the integrated circuit U2 is connected with the emitter of the triode Q1, the second pin and the third pin of the integrated circuit U2 are connected with one ends of a capacitor C1 and a resistor R6, the other end of the capacitor C1 and the fourth pin of the integrated circuit U2 are connected with a ground wire, the fifth pin of the integrated circuit U2 and the other end of the capacitor R6 are connected with a power amplification circuit, and the sixth pin of the integrated circuit U2 is connected with 15V power supply.
5. The medium frequency inversion modulation pulse trigger circuit according to claim 1, wherein: the power amplification circuit (4) comprises a resistor R7, a resistor R8, a resistor R9, a triode Q2, a triode Q3 and a triode Q4; one end of a resistor R7 is connected with a fifth pin of the integrated circuit U2 and a resistor R6 respectively, the other end of the resistor R7 is connected with bases of a triode Q2 and a triode Q3 respectively, a collector of the triode Q2 is connected with a 15V power supply, a collector of the triode Q3 is connected with a ground wire, an emitter of the triode Q2 and an emitter of the triode Q3 are connected with one end of the resistor R3, the other end of the resistor R3 is connected with a resistor R9 and a grid electrode of a MOS tube Q4 respectively, the other end of the resistor R9 and a source electrode of the MOS tube Q4 are connected with the ground wire, and a drain electrode of the MOS tube Q4 is connected with a transformer T1 (5) and a pulse shaping circuit.
6. The medium frequency inversion modulation pulse trigger circuit according to claim 1, wherein: the pulse shaping loop (6) comprises a diode D1, a diode D2, a diode D3, a diode D4, a capacitor C2 and a resistor R10, wherein the anode of the diode D2 is respectively connected with the drain electrode of the MOS tube Q4 and one end of a winding on one side of the transformer T1 (5), the cathode of the diode D2 is connected with the cathode of the diode D1, the anode of the diode D1 is respectively connected with a 24V power supply and the other end of the winding on one side of the transformer T1 (5), the anode of the diode D3 is connected with one end of the winding on the other side of the transformer T1 (5), the resistor R10, the diode D4 and the capacitor C2 are connected in parallel, one end of the resistor R10, one end of the cathode of the diode D4 and one end of the capacitor C2 are respectively connected with the cathode of the diode D3 and one end of a local circuit, and the other end of the anode of the diode D4 and the other end of the capacitor C2 are respectively connected with the other end of the winding on the other side of the transformer T1 (5) and the key of the local store.
7. The medium frequency inversion modulation pulse trigger circuit according to claim 1, wherein: the primary and secondary coils of the transformer T1 (5) are flattened by flattening T1 transformer magnetic cores.
8. The medium frequency inversion modulation pulse trigger circuit according to claim 1, wherein: the primary coil of the transformer T1 (5) is composed of a primary 30-turn high-voltage wire, and a secondary 20-turn winding.
9. The medium frequency inversion modulation pulse trigger circuit according to claim 1, wherein: the high-frequency magnetic core inside the transformer T1 (5) is a specially-made ferrite magnetic core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320536130.1U CN220067214U (en) | 2023-03-20 | 2023-03-20 | Intermediate frequency inversion modulation pulse trigger circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320536130.1U CN220067214U (en) | 2023-03-20 | 2023-03-20 | Intermediate frequency inversion modulation pulse trigger circuit |
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| Publication Number | Publication Date |
|---|---|
| CN220067214U true CN220067214U (en) | 2023-11-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320536130.1U Active CN220067214U (en) | 2023-03-20 | 2023-03-20 | Intermediate frequency inversion modulation pulse trigger circuit |
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| CN (1) | CN220067214U (en) |
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- 2023-03-20 CN CN202320536130.1U patent/CN220067214U/en active Active
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