CN-224233559-U - Transformer driving circuit

CN224233559UCN 224233559 UCN224233559 UCN 224233559UCN-224233559-U

Abstract

The utility model relates to the technical field of electronics and electrics, in particular to a transformer driving circuit which can overcome parasitic capacitance of a transformer in the opening and closing processes, reduce EMI and further improve the output quality of subsequent signals, and is characterized by comprising a driving component connected with a primary coil end of the transformer and a rectifying and filtering circuit connected with a secondary coil end of the transformer, the driving assembly comprises a triode Q1, a triode Q2, a diode D1 and a capacitor C1, wherein the triode Q1 is NPN, the triode Q2 is PNP, the triode Q1 and the triode Q2 form a push-pull circuit, the voltage-stabilizing diode D1 is connected between the e pole and the C pole of the triode Q2, the capacitor C1 is connected with the negative pole of the voltage-stabilizing diode D1, the other end of the capacitor C1 is connected with the primary coil of the transformer, and the other end of the primary coil of the transformer is grounded.

Inventors

FANG ZHENGYONG
SUN XUEYING
JIANG FENG

Assignees

山东新康威电子有限公司

Dates

Publication Date: 20260512
Application Date: 20250427

Claims (4)

1. The utility model provides a transformer drive circuit, its characterized in that is equipped with the drive assembly who links to each other with transformer primary coil end and the rectification filter circuit who links to each other with transformer secondary coil end, drive assembly includes triode Q1, triode Q2, diode D1, electric capacity C1, wherein triode Q1 is NPN, triode Q2 is PNP, triode Q1 and triode Q2 constitute push-pull circuit, connect zener diode D1 between triode Q2's the e utmost point and the C utmost point, electric capacity C1 links to each other with zener diode D1's negative pole back, the other end links to each other with transformer's primary coil, transformer's primary coil other end ground connection.
2. The transformer driving circuit according to claim 1, wherein the driving component further comprises a triode Q3, the triode Q3 adopts NPN type, the b pole of the triode Q3 is connected in series with a resistor R1, the other end of the resistor R1 is connected in series with a PWM signal input end, the e pole of the triode Q3 is grounded, the c pole of the triode Q3 is connected with a pull-up resistor R2, the other end of the pull-up resistor R2 is connected with a high potential 24V, a resistor R3 is connected between the resistor R1 and the PWM signal input end, the resistor R3 is connected in series with a resistor R4, the other end of the resistor R4 is connected with +24v, one end of a resistor R5 is connected between the resistor R3 and the resistor R4, the other end of the resistor R5 is grounded, the emitter of the triode Q3 is grounded, the resistor R7 and the resistor R6 are connected in parallel, the other end of the resistor R8 is connected in series with a base of the triode Q2, the other ends of the resistor R7 and the resistor R6 are both grounded, and one end of the resistor R9 is connected with the base of the triode Q1, and the other end is connected with the collector of the triode Q2.
3. The transformer driving circuit according to claim 1, wherein the secondary winding of the transformer is connected to a rectifying and filtering circuit, the rectifying and filtering circuit includes a diode D2, a capacitor C2, and a capacitor C3, wherein an anode of the diode D2 is connected to one end of the secondary winding, the other end of the secondary winding is grounded, and a cathode of the diode D2 is connected in series with the capacitor C2 and the capacitor C3, respectively, and then grounded.
4. The transformer driving circuit according to claim 1, wherein the transformer is a transformer with a split-type drawing skeleton, the transformer is provided with a skeleton, a coil and a magnetic core, the skeleton is a skeleton with a split-type drawing structure, the skeleton with a split-type drawing structure comprises an outer skeleton and a drawing sleeve, the outer skeleton is provided with a through hole, the drawing sleeve is located in the through hole in the center of the outer skeleton, the drawing sleeve and the inner wall of the through hole in the center of the outer skeleton are provided with gaps for winding the coil, the magnetic core is arranged in the drawing sleeve, the coil comprises a primary coil and a secondary coil, and the primary coil and the secondary coil are respectively wound on the outer wall of the drawing sleeve and the outer wall of the outer skeleton.

Description

Transformer driving circuit Technical field: The utility model relates to the technical field of electronics and electrics, in particular to a transformer driving circuit which can overcome parasitic capacitance of a transformer in the opening and closing processes, reduce EMI and further improve the output quality of subsequent signals. The background technology is as follows: The traditional transformer driving circuit can generate parasitic capacitance in the working process of the circuit due to poor coupling of primary and secondary coils of the transformer, unnecessary LC oscillation is generated, the EMI of the circuit is high, and the quality of a subsequent output signal is reduced. In order to improve the output quality of subsequent electric signals, it is imperative to reduce the parasitic capacitance of the transformer driving circuit. The invention comprises the following steps: Aiming at the defects and shortcomings in the prior art, the utility model provides the transformer driving circuit which has reasonable structure and low cost, and can obviously reduce unnecessary LC oscillation in the circuit, thereby improving the output quality of subsequent electric signals. The utility model is achieved by the following measures: The utility model provides a transformer drive circuit, its characterized in that is equipped with the drive assembly who links to each other with transformer primary coil end and the rectification filter circuit who links to each other with transformer secondary coil end, drive assembly includes triode Q1, triode Q2, diode D1, electric capacity C1, wherein triode Q1 is NPN, triode Q2 is PNP, triode Q1 and triode Q2 constitute push-pull circuit, connect zener diode D1 between triode Q2's the e utmost point and the C utmost point, electric capacity C1 links to each other with zener diode D1's negative pole back, the other end links to each other with transformer's primary coil, transformer's primary coil other end ground connection. The driving assembly further comprises a triode Q3, the triode Q3 is NPN type, the b pole of the triode Q3 is connected with a resistor R1 in series, the other end of the resistor R1 is connected with a PWM signal input end, the e pole of the triode Q3 is grounded, the c pole of the triode Q3 is connected with a pull-up resistor R2, the other end of the pull-up resistor R2 is connected with 24V high potential, a resistor R3 is connected between the resistor R1 and the PWM signal input end, the resistor R3 is connected with a resistor R4 in series, the other end of the resistor R4 is connected with +24V, one end of the resistor R5 is connected between the resistor R3 and the resistor R4, the other end of the resistor R5 is grounded, the emitter of the triode Q3 is connected with a resistor R8 in series after being connected in parallel, the other end of the resistor R8 is connected with the base of the triode Q2, the other ends of the resistor R7 and the other end of the resistor R6 are both grounded, one end of the resistor R9 is connected with the base of the triode Q1, and the other end of the resistor is connected with the collector of the triode Q2. The secondary coil of the transformer is connected with a rectifying and filtering circuit, the rectifying and filtering circuit comprises a diode D2, a capacitor C2 and a capacitor C3, wherein the positive electrode of the diode D2 is connected with one end of the secondary coil, the other end of the secondary coil is grounded, and the negative electrode of the diode D2 is respectively connected with the capacitor C2 and the capacitor C3 in series and then grounded. The transformer provided by the utility model can adopt a transformer with a drawing split type framework, the transformer is provided with the framework, the coil and the magnetic core, the framework adopts the framework with the drawing split type structure, the framework with the drawing split type structure comprises an outer framework and a drawing sleeve, the outer framework is provided with a through hole, the drawing sleeve is positioned in the through hole in the center of the outer framework, the inner walls of the through holes in the center of the drawing sleeve and the outer framework are provided with gaps for winding the coil, the magnetic core is arranged in the drawing sleeve, the coil comprises a primary coil and a secondary coil, the primary coil and the secondary coil are respectively wound on the outer wall of the drawing sleeve and the outer wall of the outer framework, and the number of turns of the primary coil or the secondary coil of the transformer can be flexibly adjusted by adjusting the number of turns of the coil on the outer wall of the drawing sleeve during operation. Compared with the prior art, the utility model has the remarkable advantages of reasonable structure, low cost, capability of remarkably reducing unnecessary LC oscillation in a circuit, further improving the output quality of subseque