A high-frequency link power supply device for a pulse trigger circuit of a high-voltage medium-frequency power supply

Abstract

The present invention discloses a high-frequency link power supply device for a pulse trigger circuit of a high-voltage medium-frequency power supply, which is used to solve the problems that the structure and manufacturing of the power frequency method are large in weight and volume, complex, and the electromagnetic environment is rich in harmonics, and the usual high-frequency link power supply cannot be applied, and even causes large-area damage in a short time. At the same time of the damage, it also causes damage to the thyristor, power supply and circuit of the medium-frequency power supply, resulting in heavy losses. It includes a common-mode filtering circuit, a fixed-frequency control circuit, a resonant power conversion network circuit, a transformer Y1 and a rectifier filtering circuit. By separating the resonant inductor and the high-frequency link magnetic core, there will be no problems in the whole working condition and abnormal situation, and it can work normally under large dv / dt, di / dt and high-energy harmonics, and at the same time does not affect the pulse part, eliminating the mis-trigger caused by the use of the high-frequency link. The transformer uses 3 turns of high-voltage wire as the primary coil to reduce the distributed capacitance of the high-frequency transformer and resist the interference and thermal effect caused by high-energy harmonics.

Description

Technical Field

[0001] The present invention relates to the technical field of high-frequency link power supply, and particularly to a high-frequency link power supply device for a pulse trigger circuit of a high-voltage medium-frequency power supply. Background Art

[0002] At present, the high-voltage high-power medium-frequency power supplies generally adopt industrial-frequency isolation power supply. The industrial-frequency method has a large weight and volume, and the structure and production are complex. However, due to the large potential difference, dv / dt, and di / dt in the high-voltage high-power medium-frequency power supply, the power supply itself has strong EMC, rich harmonics, and complex electromagnetic environment. The usual high-frequency link power supply is not applicable, and even causes large-area damage in a short time. At the same time of damage, it also causes damage to the thyristor, power supply, and circuit of the medium-frequency power supply, resulting in heavy losses. Summary of the Invention

[0003] The purpose of the present invention is to provide a high-frequency link power supply device for a pulse trigger circuit of a high-voltage medium-frequency power supply; to solve the problems that the high-voltage high-power medium-frequency power supplies generally adopt industrial-frequency isolation power supply, the industrial-frequency method has a large weight and volume, the structure and production are complex, and the rich harmonics and complex electromagnetic environment make the usual high-frequency link power supply inapplicable, and even cause large-area damage in a short time. At the same time of damage, it also causes damage to the thyristor, power supply, and circuit of the medium-frequency power supply, resulting in heavy losses; by separating the resonant inductor and the high-frequency link magnetic core, there will be no problems in the whole working condition and abnormal situations, and it can work normally under large dv / dt, di / dt, and high-energy harmonics, and at the same time does not affect the pulse part, eliminating the mis-trigger caused by the adoption of the high-frequency link. The transformer uses 3 turns of high-voltage wire as the primary coil to reduce the distributed capacitance of the high-frequency transformer and resist the interference and thermal effect caused by high-energy harmonics;

[0004] The purpose of the present invention can be achieved by the following technical solutions: A high-frequency link power supply device for a pulse trigger circuit of a high-voltage medium-frequency power supply includes a common-mode filter circuit, a fixed-frequency control circuit, a resonant power conversion network circuit, a transformer T1, and a rectifier filter circuit;

[0005] The common-mode filter circuit includes capacitor C4, filter LB1, chip capacitor EC2, chip capacitor EC1, capacitor C5, chip IC1, capacitor C6, and chip capacitor EC3. One end of capacitor C4 is connected to terminal 1 of filter LB1 and the positive pole of the power input. The other end of capacitor C4 is connected to terminal 2 of filter LB1 and the negative pole of the voltage input. Terminal 3 of filter LB1 is connected in parallel with the positive pole of chip capacitor EC2, the positive pole of chip capacitor EC1, one end of capacitor C5, and the Vin pin of chip IC1, and then connected to the drain of field-effect transistor VT1 and one end of resistor R1. Terminal 4 of filter LB1 is connected in parallel with the negative pole of chip capacitor EC2, the negative pole of chip capacitor EC1, the other end of capacitor C5, the GND pin of chip IC1, one end of capacitor C6, the negative pole of chip capacitor EC3, one end of capacitor C9, the V- pin of frequency conversion control chip U1, the source of field-effect transistor VT2, one end of capacitor C8, one end of high-value resistor R4, and one end of varistor FD, and then passes through copper ring FB and is connected to one end of the primary coil of transformer T1. The Vout pin of chip IC1 is connected in parallel with the other end of capacitor C6, the positive pole of chip capacitor EC3, and the V+ pin of frequency conversion control chip U1, and then connected to the positive pole of diode VD1.

[0006] The fixed-frequency control circuit includes frequency conversion control chip U1, diode VD1, resistor R2, capacitor C1, and capacitor C9. The RT pin of frequency conversion control chip U1 is connected to one end of resistor R2. The other end of resistor R2 is connected in parallel with the CT pin of frequency conversion control chip U1 and then connected to the other end of capacitor C9. The L0 pin of frequency conversion control chip U1 is connected to the gate of field-effect transistor VT2. The VS pin of frequency conversion control chip U1 is connected in parallel with one end of capacitor C1 and the drain of field-effect transistor VT2, and then connected to the source of field-effect transistor VT1. The H0 pin of frequency conversion control chip U1 is connected to the gate of field-effect transistor VT1. The VB pin of frequency conversion control chip U1 is connected in parallel with the negative pole of diode VD1 and then connected to the other end of capacitor C1.

[0007] The resonant power conversion network circuit includes field-effect transistors VT1 and VT2, resistor R1, capacitors C2 and C3, resonant inductor Lr, resistor R3, and capacitor C8. The other end of resistor R1 is connected to one end of capacitor C2. The other end of capacitor C2 is connected in parallel with one end of capacitor C3 and then connected to one end of resistor R3. The other end of capacitor C3 is connected to one end of resonant inductor Lr. The other end of resonant inductor Lr is connected to the other end of the primary coil of transformer T1. The other end of resistor R3 is connected to the other end of capacitor C8.

[0008] The rectifying and filtering circuit includes diode VD2, diode VD3, chip capacitor EC4 and capacitor C7; the positive electrode of diode VD2 is connected to the first output terminal a of the secondary coil of transformer T1; the positive electrode of diode VD3 is connected to the second output terminal c of the secondary coil of transformer T1; the negative electrode of diode VD2, the negative electrode of diode VD3, the positive electrode of chip capacitor EC4 and one end of capacitor C7 are connected in parallel and then connected to the positive electrode of the power supply output; the other end of capacitor C7 is connected to the negative electrode of the voltage output, the negative electrode of chip capacitor EC4, one end of high-value resistor R6, the other end of varistor FD, copper ring FB and the center tap terminal b of the secondary coil of transformer T1;

[0009] The high-value resistor R4, high-value resistor R5 and high-value resistor R6 form a high-value resistor discharge circuit; the other end of high-value resistor R6 is connected in series with one end of high-value resistor R5; the other end of high-value resistor R5 is connected in series with the other end of high-value resistor R4;

[0010] The copper ring FB sleeved on the primary coil side of the transformer T1 is connected to the center tap terminal b of the secondary coil of the transformer T1 to form an equivalent Y capacitor;

[0011] The primary coil of the transformer T1 is a 3-turn winding composed of 3 turns of high-voltage wires; the high-frequency link magnetic core inside the transformer T1 is a special ferrite magnetic ring; the magnetic core of the resonant inductor Lr is an iron-silicon-aluminum magnetic core.

[0012] The beneficial effects of the present invention: for this high-frequency link power supply device, the copper ring FB sleeved on the primary coil side of the transformer is connected to the center tap terminal b of the secondary coil of the transformer to form an equivalent Y capacitor to conduct harmonics. The high-frequency link magnetic core inside the transformer is a special ferrite magnetic ring; the magnetic core of the resonant inductor is an iron-silicon-aluminum magnetic core; the resonant inductor and the high-frequency link magnetic core are separated, so that there will be no problems in the whole working condition and abnormal situations, and it can work normally under large dv / dt, di / dt and high-energy harmonics, and at the same time does not affect the pulse part, eliminating mis-triggering caused by the use of the high-frequency link. The transformer uses 3 turns of high-voltage wires as the primary coil to reduce the distributed capacitance of the high-frequency transformer to resist interference and thermal effects caused by high-energy harmonics. Description of the Drawings

[0013] The present invention will be further described below with reference to the drawings.

[0014] Figure 1 is the principle block diagram of a high-frequency link power supply device for a high-voltage intermediate-frequency power supply pulse trigger circuit of the present invention;

[0015] Figure 2 is the circuit diagram of a high-frequency link power supply device for a high-voltage intermediate-frequency power supply pulse trigger circuit of the present invention. Detailed Embodiments

[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0017] Please refer to Figure 1-2 As shown, the present invention is a high-frequency link power supply device for a high-voltage medium-frequency power pulse trigger circuit, including a common-mode filter circuit, a fixed-frequency control circuit, a resonant power conversion network circuit, a transformer T1, and a rectifier filter circuit;

[0018] The common-mode filter circuit includes a capacitor C4, a filter LB1, a chip capacitor EC2, a chip capacitor EC1, a capacitor C5, a chip IC1, a capacitor C6, and a chip capacitor EC3; one end of the capacitor C4 is connected to the 1 terminal of the filter LB1 and the positive pole of the power input; the other end of the capacitor C4 is connected to the 2 terminal of the filter LB1 and the negative pole of the voltage input; the 3 terminal of the filter LB1 is connected in parallel with the positive pole of the chip capacitor EC2, the positive pole of the chip capacitor EC1, one end of the capacitor C5, and the Vin pin of the chip IC1 and then connected to the drain of the field-effect transistor VT1 and one end of the resistor R1; the 4 terminal of the filter LB1 is connected in parallel with the negative pole of the chip capacitor EC2, the negative pole of the chip capacitor EC1, the other end of the capacitor C5, the GND pin of the chip IC1, one end of the capacitor C6, the negative pole of the chip capacitor EC3, one end of the capacitor C9, the V- pin of the frequency conversion control chip U1, the source of the field-effect transistor VT2, one end of the capacitor C8, one end of the high-value resistor R4, and one end of the varistor FD and then passes through the copper ring FB and is connected to one end of the primary coil of the transformer T1; the Vout pin of the chip IC1 is connected in parallel with the other end of the capacitor C6, the positive pole of the chip capacitor EC3, and the V+ pin of the frequency conversion control chip U1 and then connected to the positive pole of the diode VD1;

[0019] The fixed-frequency control circuit includes a frequency conversion control chip U1, a diode VD1, a resistor R2, a capacitor C1, and a capacitor C9; the RT pin of the frequency conversion control chip U1 is connected to one end of the resistor R2; the other end of the resistor R2 is connected in parallel with the CT pin of the frequency conversion control chip U1 and then connected to the other end of the capacitor C9; the L0 pin of the frequency conversion control chip U1 is connected to the gate of the field-effect transistor VT2; the VS pin of the frequency conversion control chip U1 is connected in parallel with one end of the capacitor C1 and the drain of the field-effect transistor VT2 and then connected to the source of the field-effect transistor VT1; the H0 pin of the frequency conversion control chip U1 is connected to the gate of the field-effect transistor VT1; the VB pin of the frequency conversion control chip U1 is connected in parallel with the negative pole of the diode VD1 and then connected to the other end of the capacitor C1;

[0020] The resonant power conversion network circuit includes a field-effect transistor VT1, a field-effect transistor VT2, a resistor R1, a capacitor C2, a capacitor C3, a resonant inductor Lr, a resistor R3, and a capacitor C8; the other end of the resistor R1 is connected to one end of the capacitor C2, the other end of the capacitor C2 is connected in parallel with one end of the capacitor C3 and then connected to one end of the resistor R3, the other end of the capacitor C3 is connected to one end of the resonant inductor Lr, and the other end of the resonant inductor Lr is connected to the other end of the primary coil of the transformer T1; the other end of the resistor R3 is connected to the other end of the capacitor C8;

[0021] The rectifier and filter circuit includes a diode VD2, a diode VD3, a chip capacitor EC4, and a capacitor C7; the positive electrode of the diode VD2 is connected to the first output terminal a of the secondary coil of the transformer T1; the positive electrode of the diode VD3 is connected to the second output terminal c of the secondary coil of the transformer T1; the negative electrode of the diode VD2, the negative electrode of the diode VD3, the positive electrode of the chip capacitor EC4, and one end of the capacitor C7 are connected in parallel and then connected to the positive electrode of the power supply output; the other end of the capacitor C7 is connected to the negative electrode of the voltage output, the negative electrode of the chip capacitor EC4, one end of the high-value resistor R6, the other end of the varistor FD, the copper ring FB, and the center tap terminal b of the secondary coil of the transformer T1;

[0022] The high-value resistors R4, R5, and R6 form a high-value resistor discharge circuit; the other end of the high-value resistor R6 is connected in series with one end of the high-value resistor R5; the other end of the high-value resistor R5 is connected in series with the other end of the high-value resistor R4; the overall circuit structure of the high-frequency link power supply device adopts a fixed-frequency LLC soft switch;

[0023] The copper ring FB sleeved on the primary coil side of the transformer T1 is connected to the center tap terminal b of the secondary coil of the transformer T1 to form an equivalent Y capacitor; the harmonic is guided through the equivalent Y capacitor;

[0024] The primary coil of the transformer T1 is a 3-turn winding composed of 3 turns of high-voltage wires; the transformer T1 uses 3 turns of high-voltage wires as the primary coil to reduce the distributed capacitance of the high-frequency transformer to resist the interference and thermal effects caused by high-energy harmonics; the high-frequency link magnetic core inside the transformer T1 is a special ferrite magnetic ring; the magnetic core of the resonant inductor Lr is an iron-silicon-aluminum magnetic core;

[0025] Working principle of the present invention: A copper ring FB sleeved on the primary coil side of transformer T1 is connected to the middle tap end b of the secondary coil of transformer T1 to form an equivalent Y capacitor for harmonic conduction. The high-frequency link magnetic core inside transformer T1 is a special ferrite magnetic ring; the magnetic core of resonance inductor Lr is a Sendust magnetic core; the resonance inductor Lr and the high-frequency link magnetic core are separated, so that there will be no problems in the whole working condition and abnormal situations, and it can work normally under large dv / dt, di / dt and high-energy harmonics, and at the same time does not affect the pulse part, eliminating mis-triggering caused by the use of high-frequency links. Transformer T1 uses 3 turns of high-voltage wire as the primary coil to reduce the distributed capacitance of the high-frequency transformer to resist interference and thermal effects caused by high-energy harmonics.

[0026] The above content is only an example and explanation of the structure of the present invention. Those skilled in the art of the present technology can make various modifications or supplements or use similar methods to replace the described specific embodiments, as long as they do not deviate from the structure of the invention or exceed the scope defined by this claim book, they should fall within the protection scope of the present invention.

Claims

1. A high-frequency link power supply device for a pulse trigger circuit of a high-voltage intermediate-frequency power supply, characterized in that, it includes a common-mode filtering circuit, a fixed-frequency control circuit, a resonant power conversion network circuit, a transformer T1, and a rectifier filtering circuit; The common-mode filtering circuit includes a capacitor C4, a filter LB1, a chip capacitor EC2, a chip capacitor EC1, a capacitor C5, a chip IC1, a capacitor C6, and a chip capacitor EC3; one end of the capacitor C4 is connected to the 1 terminal of the filter LB1 and the positive pole of the power input; the other end of the capacitor C4 is connected to the 2 terminal of the filter LB1 and the negative pole of the voltage input; the 3 terminal of the filter LB1 is connected in parallel with the positive pole of the chip capacitor EC2, the positive pole of the chip capacitor EC1, one end of the capacitor C5, and the Vin pin of the chip IC1 and then connected to the drain of the field effect transistor VT1 and one end of the resistor R1; the 4 terminal of the filter LB1 is connected in parallel with the negative pole of the chip capacitor EC2, the negative pole of the chip capacitor EC1, the other end of the capacitor C5, the GND pin of the chip IC1, one end of the capacitor C6, the negative pole of the chip capacitor EC3, one end of the capacitor C9, the V- pin of the variable-frequency control chip U1, the source of the field effect transistor VT2, one end of the capacitor C8, one end of the high-value resistor R4, and one end of the varistor FD and then passes through the copper ring FB and is connected to one end of the primary coil of the transformer T1; the Vout pin of the chip IC1 is connected in parallel with the other end of the capacitor C6, the positive pole of the chip capacitor EC3, and the V+ pin of the variable-frequency control chip U1 and then connected to the positive pole of the diode VD1; The fixed-frequency control circuit includes a variable-frequency control chip U1, a diode VD1, a resistor R2, a capacitor C1, and a capacitor C9; the RT pin of the variable-frequency control chip U1 is connected to one end of the resistor R2; the other end of the resistor R2 is connected in parallel with the CT pin of the variable-frequency control chip U1 and then connected to the other end of the capacitor C9; the L0 pin of the variable-frequency control chip U1 is connected to the gate of the field effect transistor VT2; the VS pin of the variable-frequency control chip U1 is connected in parallel with one end of the capacitor C1 and the drain of the field effect transistor VT2 and then connected to the source of the field effect transistor VT1; the H0 pin of the variable-frequency control chip U1 is connected to the gate of the field effect transistor VT1; the VB pin of the variable-frequency control chip U1 is connected in parallel with the negative pole of the diode VD1 and then connected to the other end of the capacitor C1; The resonant power conversion network circuit includes a field effect transistor VT1, a field effect transistor VT2, a resistor R1, a capacitor C2, a capacitor C3, a resonant inductor Lr, a resistor R3, and a capacitor C8; the other end of the resistor R1 is connected to one end of the capacitor C2, the other end of the capacitor C2 is connected in parallel with one end of the capacitor C3 and then connected to one end of the resistor R3, the other end of the capacitor C3 is connected to one end of the resonant inductor Lr, the other end of the resonant inductor Lr is connected to the other end of the primary coil of the transformer T1; the other end of the resistor R3 is connected to the other end of the capacitor C8; The rectifying and filtering circuit includes a diode VD2, a diode VD3, a chip capacitor EC4, and a capacitor C7; the positive electrode of the diode VD2 is connected to the first output terminal a of the secondary coil of the transformer T1; the positive electrode of the diode VD3 is connected to the second output terminal c of the secondary coil of the transformer T1; the negative electrode of the diode VD2, the negative electrode of the diode VD3, the positive electrode of the chip capacitor EC4, and one end of the capacitor C7 are connected in parallel and then connected to the positive electrode of the power supply output; the other end of the capacitor C7 is connected to the negative electrode of the voltage output, the negative electrode of the chip capacitor EC4, one end of a high-value resistor R6, the other end of a varistor FD, a copper ring FB, and the center tap terminal b of the secondary coil of the transformer T1; The high-value resistors R4, R5, and R6 form a high-value resistor discharge circuit; the other end of the high-value resistor R6 is connected in series with one end of the high-value resistor R5; the other end of the high-value resistor R5 is connected in series with the other end of the high-value resistor R4; The copper ring FB sleeved on the primary coil side of the transformer T1 is connected to the center tap terminal b of the secondary coil of the transformer T1 to form an equivalent Y capacitor; The primary coil of the transformer T1 is a 3-turn winding composed of 3 turns of high-voltage wires; the high-frequency link magnetic core inside the transformer T1 is a ferrite magnetic ring; the magnetic core of the resonant inductor Lr is an iron-silicon-aluminum magnetic core.

Images