CN-224204976-U - Output switching tube driving circuit

CN224204976UCN 224204976 UCN224204976 UCN 224204976UCN-224204976-U

Abstract

The application relates to an output switching tube driving circuit which comprises a first triode, a second triode and a switching tube, wherein an emitter of the first triode is connected with a third resistor, a base electrode of the first triode is connected with a common diode, a first resistor, a zener diode and the switching tube, a collector of the first triode and a collector of the second triode are commonly connected with the second resistor, an emitter of the second triode is also connected with the second resistor, a base electrode of the second triode is connected with a field switching tube, and the second resistor is connected with a first power supply input end. Compared with the traditional switching tube driving circuit, the switching tube driving circuit provided by the embodiment has the advantages of being strong in load capacity and capable of meeting high power requirements.

Inventors

CHEN JING
WU GUIDI

Assignees

厦门科司特电子股份有限公司

Dates

Publication Date: 20260505
Application Date: 20250508

Claims (1)

1. The output switching tube driving circuit is characterized by comprising a first triode, a second triode and a switching tube, wherein the emitter of the first triode is connected with a third resistor, the base of the first triode is connected with a common diode, a first resistor, a zener diode and the switching tube, the collector of the first triode and the collector of the second triode are commonly connected with the second resistor, the emitter of the second triode is also connected with the second resistor, and the base of the second triode is connected with the switching tube; When the switching tube driving circuit works, when a driving signal passes through the first resistor, the grid electrode and the source electrode of the switching tube are stabilized at a voltage due to the voltage stabilizing diode, so that enough driving current and voltage are provided for the switching tube, the switching tube is turned on, and the output signal of the switching tube is equal to the input signal; when the driving signal passes through the second resistor, driving current and voltage are provided for the triode, and after the switching tube is conducted, the potential of the base electrode and the potential of the collector electrode of the first triode are consistent, and the first triode is in a conducting state; When the driving signal of the switching tube is withdrawn, the potential of the grid electrode of the switching tube is lower, the switching tube is in an off state, the common diode reduces the off time, reduces the loss during the off, and the first triode and the second triode are in the off state due to the low potential of the base electrode.

Description

Output switching tube driving circuit Technical Field The utility model relates to the technical field of circuits, in particular to an output switching tube driving circuit. Background The switching tube driving circuit is a core component of the power electronic technology and has wide application in the fields of power management, motor control, inverter, illumination, industrial control and the like. In terms of a driving mode and circuit design of the switching tube driving circuit, direct driving is the simplest mode, but the mode often has the problem that the power requirement cannot be met, so that the driving circuit needs to have enough driving capability in terms of technical characteristics and requirements. In the related art, a switching tube driving circuit which is directly driven and has strong carrying capacity and can meet the high power requirement is lacking. Disclosure of utility model The application provides an output switching tube driving circuit which solves the problem that the existing output switching tube driving circuit cannot meet power requirements. To this end, in a first aspect, an embodiment of the present application provides an output switch driving circuit, including: The power supply comprises a first triode, a second triode and a switch tube, wherein the emitter of the first triode is connected with a third resistor, the base electrode of the first triode is connected with a common diode, the first resistor, a zener diode and the switch tube, and the collector of the first triode and the collector of the second triode are commonly connected with a second resistor; When the switch driving circuit works, when a driving signal passes through the first resistor, the grid electrode and the source electrode of the switch tube are stabilized at a voltage due to the voltage stabilizing diode, so that enough driving current and voltage are provided for the switch tube, the switch tube is turned on, and the output signal of the switch tube is equal to the input signal; when the driving signal passes through the second resistor, driving current and voltage are provided for the triode, the potential of the base electrode and the potential of the collector electrode of the first triode are basically consistent at the moment, and the first triode is in a conducting state; When the driving signal of the switching tube is withdrawn, the potential of the grid electrode of the switching tube is lower, the switching tube is in an off state, the common diode reduces the off time, reduces the loss during the off, and the first triode and the second triode are in the off state due to the low potential of the base electrode. According to the output switching tube driving circuit provided by the application, when a driving signal passes through the first resistor, the grid electrode and the source electrode of the switching tube are stabilized at a voltage due to the voltage stabilizing diode, so that enough driving current and voltage are provided for the switching tube, the switching tube is conducted, the output signal of the switching tube is equal to an input signal, when the driving signal passes through the second resistor, the driving current and the voltage are provided for the transistor, after the switching tube is conducted, the potential of the base electrode and the collector electrode of the first transistor are basically consistent, the first transistor is in a conducting state, the potential of the base electrode and the emitter electrode of the second transistor are consistent, the potential of the collector electrode is low, so that the second transistor is in an off state, the driving signal returns to an input signal through the first resistor, the first transistor and the third resistor, the third resistor is a sampling resistor, when the driving signal of the switching tube is withdrawn, the grid electrode potential of the switching tube is low, the switching tube is in an off state, the common diode reduces the turn-off time, and simultaneously reduces the loss when the switching tube is turned off, the first transistor and the second transistor are also in the off state due to the low potential of the base electrode. Based on the technical scheme provided by the embodiment of the application, the driving signal is mainly used for providing a driving signal for the switching tube and providing enough driving current and voltage for the switching tube so as to ensure that the switching tube reliably switches states. Compared with the traditional switching tube driving circuit, the switching tube driving circuit of the embodiment has strong load capacity and can meet the high power requirement although being directly driven. Drawings In order to more clearly illustrate the embodiments of the application or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will