阅读说明：本技术 一种控制器i/o口蜂鸣器驱动电路 (Buzzer driving circuit of I/O port of controller ) 是由 桑泉 陈徐州 于 2019-10-10 设计创作，主要内容包括：本发明公开一种控制器I/O口蜂鸣器驱动电路,包括限流电阻与三极管复合放大驱动电路,三极管复合放大驱动电路包含三极管V1与三极管V2,限流电阻串联在控制器I/O端与三极管V1的基极之间,三极管V1的集电极和三极管V2的集电极共同连接蜂鸣器的负极,蜂鸣器的正极连接供电电源正极,三级管V1的发射极连接三极管V2的基极,三极管V2的发射极连接供电电源GND端；由三极管V1与三极管V2构成三极管复合放大驱动电路,能够进行电流放大驱动蜂鸣器,且能够实现低压、高电流放大倍数的目的,本电路结构简单、成本低。(The invention discloses a buzzer driving circuit of an I/O port of a controller, which comprises a current-limiting resistor and a triode composite amplification driving circuit, wherein the triode composite amplification driving circuit comprises a triode V1 and a triode V2, the current-limiting resistor is connected between the I/O port of the controller and the base electrode of a triode V1 in series, the collector electrode of the triode V1 and the collector electrode of the triode V2 are connected with the negative electrode of the buzzer together, the positive electrode of the buzzer is connected with the positive electrode of a power supply, the emitter electrode of a triode V1 is connected with the base electrode of a triode V2, and the emitter electrode of the triode V2 is connected with the GND end of the power; the triode composite amplification driving circuit is formed by the triode V1 and the triode V2, can amplify current to drive the buzzer, can achieve the purpose of low voltage and high current amplification factor, and is simple in structure and low in cost.)

1. The utility model provides a controller I/O mouth buzzer drive circuit, which characterized in that, including current-limiting resistor and triode composite amplification drive circuit, triode composite amplification drive circuit contains triode V1 and triode V2, current-limiting resistor establishes ties between controller I/O end and the base of triode V1, the negative pole of buzzer is connected jointly to the collecting electrode of triode V1 and the collecting electrode of triode V2, the anodal power supply positive pole of connecting of buzzer, the base of triode V2 is connected to the projecting pole of triode V1, the projecting pole of triode V2 is connected power supply GND end.

Technical Field

The invention relates to the technical field of integrated circuit current driving devices, in particular to a buzzer driving circuit of an I/O port of a controller.

Background

The buzzer driving circuit is generally driven by direct current voltage and a triode, and the input direct current voltage is high and the current is large. For the I/O port of the controller of the integrated circuit, the level voltage is very low, the current is small and is not enough to drive the buzzer, and if the buzzer is driven, the great current amplification factor is needed.

Disclosure of Invention

The invention aims to provide a buzzer driving circuit of an I/O port of a controller, which has the advantages of low input voltage and large driving current and can drive a buzzer by a simple structure.

The technical scheme adopted by the invention for solving the technical problems is as follows:

the utility model provides a controller IO mouth buzzer drive circuit, including current-limiting resistor and triode composite amplification drive circuit, triode composite amplification drive circuit contains triode V1 and triode V2, current-limiting resistor establishes ties between controller IO end and the base of triode V1, the negative pole of buzzer is connected jointly to the collecting electrode of triode V1 and the collecting electrode of triode V2, the positive pole of buzzer is connected the power supply positive pole, the base of triode V2 is connected to the projecting pole of triode V1, the projecting pole of triode V2 is connected the power supply GND end.

The triode composite amplification driving circuit has the advantages that the triode V1 and the triode V2 form the triode composite amplification driving circuit, the current amplification driving buzzer can be carried out, the purposes of low voltage and high current amplification times can be achieved, and the circuit is simple in structure and low in cost.

Drawings

The invention is further illustrated with reference to the following figures and examples:

FIG. 1 is an electrical block diagram of the present invention;

fig. 2 is a circuit schematic of the present invention.

Detailed Description

Referring to fig. 1 and 2, the invention provides a buzzer driving circuit at an I/O port of a controller, which includes a current-limiting resistor R1 and a triode composite amplification driving circuit 1, wherein the triode composite amplification driving circuit 1 includes a triode V1 and a triode V2, the current-limiting resistor R1 is connected in series between an I/O port of the controller and a base of the triode V1, a collector of the triode V1 and a collector of the triode V2 are connected to a cathode of a buzzer BUZ, an anode of the buzzer BUZ is connected to an anode of a 12V power supply, an emitter of the triode V1 is connected to a base of the triode V2, and an emitter of the triode V2 is connected to a GND terminal of the power supply.

The triode composite amplification driving circuit is formed by the triode V1 and the triode V2, can amplify current to drive the buzzer, can achieve the purpose of low voltage and high current amplification factor, and is simple in structure and low in cost.

The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner; those skilled in the art can make numerous possible variations and modifications to the present teachings, or modify equivalent embodiments to equivalent variations, without departing from the scope of the present teachings, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent replacement, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention.