External reinforced push-pull output circuit

Abstract

The utility model discloses an external reinforced push-pull output circuit, which comprises a connector SCP, the connector SCP is connected with a first bipolar junction transistor Q1, the base electrode of the first bipolar junction transistor Q1 is connected with a second triode Q2 and a third triode Q3, the common end of the second triode Q2 and the third triode Q3 is connected with a fourth triode Q4, the base electrode of the fourth triode Q4 is connected with a COOL end, and the base electrode of the fourth triode Q4 is connected with a power supply. The collector electrode of the fourth triode Q4 is connected with a 12V end, the collector electrode of the second triode Q2 is connected with a grounding end GND, and the collector electrode of the third triode Q3 is connected with a 12V end. According to the circuit, when a high level is supplied through a COOL end, the first bipolar junction transistor Q1, the second triode Q2, the third triode Q3, the fourth triode Q4 are controlled to be switched on or switched off, the current capacity for driving a load is improved, the effect that a small current of a single-chip microcomputer controls a large current is achieved, the single-chip microcomputer is protected, and the service life of the single-chip microcomputer is prolonged.

Description

Technical Field

[0001] This utility model specifically relates to an externally reinforced push-pull output circuit. Background Technology

[0002] With the continuous advancement and innovation of science and technology, technologies in specific fields have been widely researched and applied. However, existing technologies still have many shortcomings in terms of production costs, such as the limited driving capability of ordinary microcontroller I / O ports. These problems restrict the development of this field and the expansion of its application scope. Summary of the Invention

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of this invention is to provide an externally reinforced push-pull output circuit that can increase the drive current capability, reduce production costs, protect the microcontroller, and extend its lifespan.

[0004] This utility model provides an externally enhanced push-pull output circuit, including a connector SCP. The connector SCP is connected to a first bipolar junction transistor Q1. The emitter of the first bipolar junction transistor Q1 is connected to a ground terminal GND. The base of the first bipolar junction transistor Q1 is connected to a second transistor Q2 and a third transistor Q3. The common terminal of the second transistor Q2 and the third transistor Q3 is connected to a fourth transistor Q4. The base of the fourth transistor Q4 is connected to a COOL terminal. The collector of the fourth transistor Q4 is connected to a 12V terminal. The collector of the second transistor Q2 is connected to a ground terminal GND. The collector of the third transistor Q3 is connected to a 12V terminal.

[0005] Specifically, the base of the fourth transistor Q4 is connected to the COOL terminal through a second resistor R2.

[0006] Specifically, the collector of the fourth transistor Q4 is connected to the 12V terminal through a third resistor R3.

[0007] Specifically, a first resistor R1 is connected to the common terminal between the emitter of the second transistor Q2 and the emitter of the third transistor Q3, and the first resistor R1 is connected to the base of the first bipolar junction transistor Q1.

[0008] Specifically, the collector of the first bipolar junction transistor Q1 is connected to pin 2 of the connector SCP via a first diode D1. A capacitor C1 is connected to the common terminal of the connector SCP and the first diode D1. An inductor L1 is connected to the capacitor C1. The inductor L1 is connected to the common terminal between the first diode D1 and the collector of the first bipolar junction transistor Q1.

[0009] Specifically, the capacitor C1 is connected in parallel with an electrolytic capacitor EC1, and the positive terminal of the electrolytic capacitor EC1 is connected to a 12V terminal.

[0010] The beneficial effects of this utility model are: when the COOL terminal is given a high level or a high level, this circuit controls the first bipolar junction transistor Q1, the second transistor Q2, the third transistor Q3 and the fourth transistor Q4 to conduct or disconnect, which can increase the driving current capability, reduce production costs, realize the function of controlling a large current with a small current from the microcontroller, better drive the load, protect the microcontroller and extend its life. Attached Figure Description

[0011] The above and / or additional aspects and advantages of this invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings.

[0012] Figure 1 This is the circuit diagram of this utility model. Detailed Implementation

[0013] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0014] The following is for reference. Figure 1 This invention describes an externally enhanced push-pull output circuit, comprising a connector SCP, to which a first bipolar junction transistor Q1 is connected. The emitter of the first bipolar junction transistor Q1 is connected to ground GND. The base of the first bipolar junction transistor Q1 is connected to a second transistor Q2 and a third transistor Q3. The common terminal of the second transistor Q2 and the third transistor Q3 is connected to a fourth transistor Q4. The base of the fourth transistor Q4 is connected to a COOL terminal. The collector of the fourth transistor Q4 is connected to a 12V terminal. The collector of the second transistor Q2 is connected to ground GND, and the collector of the third transistor Q3 is connected to a 12V terminal.

[0015] The SC92F8411 control chip has insufficient IO output capability with a 3.3V output. The selected second transistor Q2, third transistor Q3, and fourth transistor Q4 have a voltage withstand capability of 20V; the first bipolar junction transistor Q1 has a voltage withstand capability of 60V.

[0016] When the COOL terminal is given a high level, the third transistor Q4 is turned on, the 12V terminal is pulled to ground, the third transistor Q3 is closed, the second transistor Q2 is turned on, pulling the base of the first bipolar junction transistor Q1 to ground, and the first bipolar junction transistor Q1 is reliably not turned on.

[0017] When COOL is low, the third transistor Q4 is closed, the third transistor Q3 is turned on, the first bipolar junction transistor Q1 is turned on, and the second transistor Q2 is closed, outputting 12V to drive the load, and the load can output a large current; through the above technical solution, the current driving capability of the load can be increased.

[0018] The base of the fourth transistor Q4 in this circuit is connected to the COOL terminal through a second resistor R2, which serves to protect the fourth transistor Q4.

[0019] In this circuit, the collector of the fourth transistor Q4 is connected to the 12V terminal via a third resistor R3. The third resistor R3 acts as a voltage limiter to protect the fourth transistor Q4.

[0020] In this circuit, a first resistor R1 is connected to the common terminal between the emitter of the second transistor Q2 and the emitter of the third transistor Q3. The first resistor R1 is connected to the base of the first bipolar junction transistor Q1. The first resistor R1 acts as a voltage limiter to protect the first bipolar junction transistor Q1.

[0021] In this circuit, the collector of the first bipolar junction transistor Q1 is connected to pin 2 of the connector SCP via a first diode D1. A capacitor C1 is connected to the common terminal of the first diode D1, and an inductor L1 is connected to the common terminal between the first diode D1 and the collector of the first bipolar junction transistor Q1. The first diode D1 provides unidirectional current flow; the inductor L1 serves functions such as filtering, oscillation, delay, and notch filtering, as well as signal screening, noise filtering, current stabilization, and electromagnetic interference suppression.

[0022] In this circuit, capacitor C1 is connected in parallel with electrolytic capacitor EC1, and the positive terminal of electrolytic capacitor EC1 is connected to a 12V terminal. The combination of electrolytic capacitor EC1 and capacitor C1 has a strong energy storage capacity and can release a large amount of energy in a short time, making it suitable for applications requiring instantaneous high current.

[0023] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. one An externally reinforced push-pull output circuit, including a connector SCP, is characterized by: The connector SCP is connected to a first bipolar junction transistor Q1. The emitter of the first bipolar junction transistor Q1 is connected to ground GND. The base of the first bipolar junction transistor Q1 is connected to a second transistor Q2 and a third transistor Q3. The common terminal of the second transistor Q2 and the third transistor Q3 is connected to a fourth transistor Q4. The base of the fourth transistor Q4 is connected to the COOL terminal. The collector of the fourth transistor Q4 is connected to a 12V terminal. The collector of the second transistor Q2 is connected to ground GND. The collector of the third transistor Q3 is connected to a 12V terminal.

2. The externally reinforced push-pull output circuit according to claim 1, characterized in that: The base of the fourth transistor Q4 is connected to the COOL terminal via a second resistor R2.

3. The externally reinforced push-pull output circuit according to claim 1, characterized in that: The collector of the fourth transistor Q4 is connected to the 12V terminal through a third resistor R3.

4. The externally reinforced push-pull output circuit according to claim 1, characterized in that: A first resistor R1 is connected to the common terminal between the emitter of the second transistor Q2 and the emitter of the third transistor Q3. The first resistor R1 is connected to the base of the first bipolar junction transistor Q1.

5. The externally reinforced push-pull output circuit according to claim 1, characterized in that: The collector of the first bipolar junction transistor Q1 is connected to pin 2 of the connector SCP via a first diode D1. A capacitor C1 is connected to the common terminal of the connector SCP and the first diode D1. An inductor L1 is connected to the capacitor C1. The inductor L1 is connected to the common terminal between the first diode D1 and the collector of the first bipolar junction transistor Q1.

6. The externally reinforced push-pull output circuit according to claim 5, characterized in that: The capacitor C1 is connected in parallel with an electrolytic capacitor EC1, and the positive terminal of the electrolytic capacitor EC1 is connected to a 12V terminal.

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