阅读说明：本技术 一种内置低电压启动驱动芯片的蜂鸣器 (Buzzer with built-in low-voltage starting driving chip ) 是由 张怀东 于 2020-03-16 设计创作，主要内容包括：本发明涉及一种内置低电压启动驱动芯片的蜂鸣器,包括集成电路驱动芯片、电容、单组电磁线圈、线路板、支架、磁环、振动片、正极针脚、负极针脚、壳体、密封胶,其中所述集成电路驱动芯片、电容、正极针脚、负极针脚焊接在线路板上,集成电路驱动芯片电源连接电容一端,电容另一端连接负极针脚,集成电路驱动芯片地线连接负极针脚,单组电磁线圈一端连接正极针脚,单组电磁线圈另一端连接集成电路驱动芯片的输出端,所述集成电路驱动芯片内部包含控制电路、PMOS管、振荡电路、整流电路、驱动电路,PMOS管起到低电压启动作用。本产品的技术方案具有启动电压低、抗干扰能力强、可靠性高和成本低的优点。(The invention relates to a buzzer with a built-in low-voltage starting driving chip, which comprises an integrated circuit driving chip, a capacitor, a single group of electromagnetic coils, a circuit board, a support, a magnetic ring, a vibrating reed, an anode pin, a cathode pin, a shell and sealant, wherein the integrated circuit driving chip, the capacitor, the anode pin and the cathode pin are welded on the circuit board, a power supply of the integrated circuit driving chip is connected with one end of the capacitor, the other end of the capacitor is connected with the cathode pin, a ground wire of the integrated circuit driving chip is connected with the cathode pin, one end of the single group of electromagnetic coils is connected with the anode pin, the other end of the single group of electromagnetic coils is connected with the output end of the integrated circuit driving chip, the integrated circuit driving chip internally comprises a control circuit, a PMOS (P. The technical scheme of the product has the advantages of low starting voltage, strong anti-interference capability, high reliability and low cost.)

1. A buzzer with a built-in low-voltage starting driving chip comprises an integrated circuit driving chip, a single-group electromagnetic coil, a capacitor, a circuit board, a support, a magnetic ring, a vibrating piece, an anode pin, a cathode pin, a shell and sealant.

2. The buzzer with the built-in low-voltage starting driving chip as claimed in claim 1, wherein said integrated circuit driving chip, capacitor, positive pin and negative pin are soldered on the circuit board.

3. The buzzer with the built-in low-voltage starting driving chip as claimed in claim 1, wherein the power supply of the integrated circuit driving chip is connected with one end of the capacitor, the other end of the capacitor is connected with the negative pin, the ground wire of the integrated circuit driving chip is connected with the negative pin, one end of the single group of electromagnetic coils is connected with the positive pin, and the other end of the single group of electromagnetic coils is connected with the output end of the integrated circuit driving chip.

4. The buzzer with a built-in low-voltage start-up driving chip as claimed in claim 1, wherein said integrated circuit driving chip has three pins, which are a power terminal, a ground terminal and an output terminal.

5. The buzzer with a built-in low-voltage start-up driving chip as claimed in claim 1, wherein said integrated circuit driving chip internally comprises a control circuit, a PMOS transistor, an oscillating circuit, a rectifying circuit, and a driving transistor.

6. The buzzer with a built-in low voltage start-up driver chip as claimed in claim 1, wherein said PMOS transistor inside said ic driver chip is used to lower the start-up voltage of said ic driver chip.

7. The integrated circuit driver chip of claim 6 wherein the PMOS transistor is replaced by a PNP transistor.

8. The buzzer with a built-in low voltage start-up driving chip as claimed in claim 1, wherein said integrated circuit driving chip is an integrated circuit using silicon material.

Technical Field

The invention relates to an electromagnetic buzzer, in particular to an active buzzer with a built-in low-voltage starting driving chip.

Background

Most of the existing electromagnetic type active buzzers still use triodes to form a double-set electromagnetic coil structure of a driving circuit, and have the defects of high cost, low reliability and the like; there is also a single-group electromagnetic coil structure using a chip as a driving circuit, but there are disadvantages such as high starting voltage and low reliability.

Disclosure of Invention

The invention aims to solve the defects of high starting voltage, low reliability and the like when an integrated circuit chip is used as an active buzzer driving circuit.

In order to solve the problem, the invention provides a buzzer with a built-in low-voltage starting driving chip, which comprises an integrated circuit driving chip, a capacitor, a single group of electromagnetic coils, a circuit board, a support, a magnetic ring, a vibrating piece, an anode pin, a cathode pin, a shell and sealant, wherein the integrated circuit driving chip, the capacitor, the anode pin and the cathode pin are welded on the circuit board, a power supply of the integrated circuit driving chip is connected with one end of the capacitor, the other end of the capacitor is connected with the cathode pin, a ground wire of the integrated circuit driving chip is connected with the cathode pin, one end of the single group of electromagnetic coils is connected with the anode pin, the other end of the single group of electromagnetic coils is connected with the output end of the integrated circuit driving chip, and the integrated circuit driving.

When the pin of the positive electrode of the buzzer is connected with the direct current positive electrode and the pin of the negative electrode of the buzzer is connected with the direct current negative electrode, the direct current positive electrode charges the capacitor through the single group of electromagnetic coils and the PMOS tube, the integrated circuit drives the internal oscillating circuit of the chip to work, and outputs a certain frequency signal to drive the single group of electromagnetic coils through the output end OUT through the driving circuit, so that the buzzer makes a sound, and the frequency of the sound is determined by the frequency of the integrated circuit driving the internal oscillating circuit of the chip.

Because the voltage drop generated by charging the capacitor by the PMOS tube is far less than that generated by charging the capacitor by the rectifying circuit, for example, the voltage drop generated by charging the capacitor by the diode serving as the rectifying circuit is about 0.5V, and the voltage drop generated by charging the capacitor by the PMOS tube is about 0.1V under the control of the internal control circuit of the integrated circuit driving chip, the starting voltage of the buzzer is effectively reduced, and if the integrated circuit driving chip does not contain a voltage reference source, the starting voltage is lower.

The capacitor has the functions of stabilizing the power supply voltage of the integrated circuit driving chip and effectively absorbing the peak voltage and the instantaneous large current generated by the single group of electromagnetic coils, and the reliability of the buzzer is effectively improved.

In order to further save cost, the integrated circuit driving chip is an integrated circuit using silicon material.

Preferably, the internal PMOS tube of the integrated circuit driving chip can be replaced by a PNP triode.

In conclusion, the invention has the following beneficial effects: a buzzer with a built-in low-voltage starting driving chip has the advantages of low starting voltage, high reliability and low cost.

Drawings

Fig. 1 is a schematic structural view of the present invention.

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

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1, the invention provides a buzzer with a built-in low-voltage start driving chip, which comprises an integrated circuit driving chip 10, a capacitor 11, a single group of electromagnetic coils 5, a circuit board 6, a bracket 3, a magnetic ring 4, a vibrating reed 2, an anode pin 8, a cathode pin 9, a shell 1 and a sealant 7.

In actual installation, as shown in fig. 1, the integrated circuit driving chip 10, the capacitor 11, the positive pin 8 and the negative pin 9 are soldered on the circuit board 6.

Referring to fig. 2, in conjunction with fig. 1, the circuit connection relationship is: the power supply of the integrated circuit driving chip 10 is connected with one end of the capacitor 11, the other end of the capacitor 11 is connected with the negative pin 9, the ground wire of the integrated circuit driving chip 10 is connected with the negative pin 9, one end of the single group of electromagnetic coils 5 is connected with the positive pin 8, and the other end of the single group of electromagnetic coils 5 is connected with the output end of the integrated circuit driving chip 10.

In conclusion, the invention has the following beneficial effects: a buzzer with a built-in low-voltage starting driving chip has the advantages of low starting voltage, high reliability and low cost.

The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.