Output switch tube driving circuit

Abstract

The utility model relates to an output switching tube driving circuit, which comprises a first triode, a second triode and a switching tube, and is characterized in that the emitter of the first triode is connected with a third resistor, and the base of the first triode is connected with a common diode, a first resistor, a voltage stabilizing diode and the switching tube; the collector of the first triode and the collector of the second triode are connected with a second resistor. The emitter of the second triode is also connected to the second resistor, and the base of the second triode is connected with the field switching tube; the second resistor is connected with the first power input end. Compared with a traditional switch tube driving circuit, the switch tube driving circuit provided by the embodiment has the advantages of being high in load capacity and capable of meeting the high-power requirement.

Description

Technical Field

[0001] This utility model relates to the field of circuit technology and is an output switch driving circuit. Background Technology

[0002] Switching transistor driver circuits are a core component of power electronics technology, widely used in power management, motor control, inverters, lighting, and industrial control. In terms of driving methods and circuit design, direct drive is the simplest approach, but it often fails to meet power requirements. Therefore, in terms of technical characteristics and requirements, the driver circuit needs to possess sufficient driving capability.

[0003] In related technologies, there is a lack of a switch driver circuit that can directly drive the transistor, has a strong load-carrying capacity, and can meet high power requirements. Utility Model Content

[0004] This application provides an output switch driver circuit to solve the problem that existing output switch driver circuits cannot meet power requirements.

[0005] Therefore, in a first aspect, embodiments of this application provide an output switch driving circuit, including:

[0006] The transistor consists of a first transistor, a second transistor, and a switching transistor. The emitter of the first transistor is connected to a third resistor. The base of the first transistor is connected to a general-purpose diode, a first resistor, a Zener diode, and the switching transistor. The collectors of the first and second transistors are connected to a second resistor. The emitter of the second transistor is also connected to the second resistor. The base of the second transistor is connected to the switching transistor. The second resistor is connected to the first power input terminal.

[0007] When this switch driver circuit is working, if a drive signal is applied to the switch transistor through the first resistor, the gate and source of the switch transistor are stabilized at a voltage due to the Zener diode, thus providing sufficient drive current and voltage to the switch transistor, causing it to turn on. At this time, the output signal of the switch transistor is equal to the input signal. When the drive signal passes through the second resistor, it provides drive current and voltage to the transistor. After the switch transistor turns on, the base and collector potentials of the first transistor are basically the same, and the first transistor is in the conducting state. The base and emitter potentials of the second transistor are the same, while the collector potential is low, so the second transistor is in the off state. At this time, the drive signal returns to the input signal through the first resistor, the first transistor, and the third resistor, where the third resistor is the sampling resistor.

[0008] When the drive signal for the switching transistor is removed, the gate potential of the switching transistor is low, and the switching transistor is in the off state. At this time, the ordinary diode reduces the turn-off time and reduces the loss during turn-off. The first transistor and the second transistor are also in the off state because their base potentials are low.

[0009] According to the output switch driving circuit provided in this application, when a driving signal is applied to the switch through the first resistor, the gate and source of the switch are stabilized at a voltage due to the Zener diode, thus providing sufficient driving current and voltage to the switch, causing the switch to conduct. At this time, the output signal of the switch is equal to the input signal. When the driving signal passes through the second resistor, it provides driving current and voltage to the transistor. After the switch is turned on, the base and collector potentials of the first transistor are basically the same, and the first transistor is in a conducting state. The base and emitter potentials of the second transistor are the same, and the collector potential is low, so the second transistor is in a turning-off state. At this time, the driving signal returns to the input signal through the first resistor, the first transistor, and the third resistor, where the third resistor is a sampling resistor. When the driving signal to the switch is removed, the gate potential of the switch is low, and the switch is in a turning-off state. At this time, the ordinary diode reduces the turn-off time and reduces the loss during turn-off. The first and second transistors are also in a turning-off state due to their low base potentials. The main feature of the technical solution provided in this application is to provide a drive signal to the switching transistor, thereby providing sufficient drive current and voltage to ensure reliable switching of the transistor. Compared to traditional switching transistor drive circuits, the switching transistor drive circuit in this embodiment, although a direct drive, has strong load-carrying capacity and can meet high power requirements. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without creative effort. In addition, in the drawings, the same parts use the same reference numerals, and the drawings are not drawn to scale.

[0011] Figure 1 This is a schematic diagram of an output switch driving circuit provided in one embodiment of the application. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0013] Figure 1 This application provides a schematic diagram of an output switch driving circuit according to an embodiment of the present application, referring to... Figure 1 As shown, the output switch driving circuit provided in this embodiment includes: a first transistor Q1, a second transistor Q2, and a switch Q3, where Q3 is a field-effect MOSFET. The emitter of the first transistor Q1 is connected to a third resistor R3, and the base of the first transistor Q1 is connected to a general diode D1, a first resistor R1, a Zener diode ZD1, and the switch Q3. The collector of the first transistor Q1 and the collector of the second transistor Q2 are connected to a second resistor R2. The emitter of the second transistor Q2 is also connected to the second resistor R2, and the base of the second transistor Q2 is connected to the switch Q3. The second resistor R2 is connected to the first power input terminal +30VCC.

[0014] In this switching transistor drive circuit, Q3 is the driven transistor. When a drive signal is applied to Q3 through the first resistor R1, the gate and source of Q3 are stabilized at a voltage due to the Zener diode ZD1, thus providing sufficient drive current and voltage to Q3, causing Q3 to conduct. At this time, the output signal of Q3 equals the input signal. When the drive signal passes through the second resistor R2, it provides drive current and voltage to the first transistor Q1 and the second transistor Q2. After Q3 conducts, the base and collector potentials of the first transistor are the same, and the first transistor is in a conducting state. The base and emitter potentials of the second transistor are the same, while the collector potential is low, so the second transistor is in a turning-off state. At this time, the drive signal returns to the input signal through the first resistor, the first transistor, and the third resistor. The third resistor is a sampling resistor.

[0015] When the drive signal for switch Q3 is removed, the gate potential of switch Q3 is low, and switch Q3 is in the off state. At this time, ordinary diode D1 reduces the turn-off time and reduces the loss during turn-off. The first transistor Q1 and the second transistor Q2 are also in the off state due to their low base potential.

[0016] This invention provides an output switch driving circuit, which mainly provides a driving signal to the switch, supplying a sufficiently large driving current and voltage to ensure reliable switching of the switch state. Compared with traditional direct drive circuits for switches, this switch driving circuit has the advantages of strong load-carrying capacity and the ability to meet high power requirements.

[0017] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0018] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. An output switch transistor driving circuit, characterized in that, include: The transistor consists of a first transistor, a second transistor, and a switching transistor. The emitter of the first transistor is connected to a third resistor. The base of the first transistor is connected to a general-purpose diode, a first resistor, a Zener diode, and the switching transistor. The collectors of the first and second transistors are connected to a second resistor. The emitter of the second transistor is also connected to the second resistor. The base of the second transistor is connected to the switching transistor. The second resistor is connected to the first power input terminal. When this switching transistor drive circuit is working, if a drive signal is applied to the switching transistor through the first resistor, the gate and source of the switching transistor are stabilized at a voltage due to the Zener diode, thus providing sufficient drive current and voltage to the switching transistor, causing it to conduct. At this time, the output signal of the switching transistor is equal to the input signal. When the drive signal passes through the second resistor, it provides drive current and voltage to the transistor. After the switching transistor is turned on, the base and collector potentials of the first transistor are the same, and the first transistor is in the conducting state. The base and emitter potentials of the second transistor are the same, while the collector potential is low, so the second transistor is in the off state. At this time, the drive signal returns to the input signal through the first resistor, the first transistor, and the third resistor. The third resistor is a sampling resistor. When the drive signal for the switching transistor is removed, the gate potential of the switching transistor is low, and the switching transistor is in the off state. At this time, the ordinary diode reduces the turn-off time and reduces the loss during turn-off. The first transistor and the second transistor are also in the off state because their base potentials are low.

Images