阅读说明：本技术 一种内置带防反接和振荡器驱动芯片的蜂鸣器 (Built-in buzzer with reverse connection prevention and oscillator driving chip ) 是由 张怀东 于 2020-03-12 设计创作，主要内容包括：本发明涉及一种内置带防反接和振荡器驱动芯片的蜂鸣器,包括集成电路驱动芯片、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、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正极针脚,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限流电阻、振荡电路、整流电路、驱动电路,限流电阻起到防反接作用。本产品的技术方案具有防反接、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 built-in buzzer with an anti-reverse connection and an oscillator driving chip, which comprises an integrated circuit driving chip, a single group of electromagnetic coils, a circuit board, a support, a magnetic ring, a vibrating reed, a positive pin, a negative pin, a shell and sealant, wherein the integrated circuit driving chip, the positive pin and the negative pin are welded on the circuit board, a power supply of the integrated circuit driving chip is connected with the positive pin, a 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, 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 current limiting resistor, an oscillating circuit, a rectifying circuit and a driving. The technical scheme of the product has the advantages of reverse connection prevention, low starting voltage, strong anti-interference capability, high reliability and low cost.)

1. A built-in buzzer with an anti-reverse connection and oscillator driving chip comprises an integrated circuit driving chip, 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 anode pin and the cathode pin are welded on the circuit board, a power supply of the integrated circuit driving chip is connected with the anode 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, and the other end of the single group of electromagnetic coils is connected with the output end of the integrated circuit driving.

2. The buzzer with the anti-reverse connection and oscillator driving chip built in as claimed in claim 1, wherein said integrated circuit driving chip has three pins, which are power terminal, ground terminal and output terminal, said integrated circuit driving chip internally includes current limiting resistor, oscillating circuit, rectifying circuit and driving tube.

3. The buzzer with the anti-reverse connection and oscillator driving chip built in as claimed in claim 1, wherein the current limiting resistor inside the integrated circuit driving chip limits the current of the circuit modules such as the oscillating circuit, the driving circuit and the like inside the chip.

4. The buzzer with the anti-reverse connection and oscillator driving chip built in as claimed in claim 1, wherein the current limiting resistor inside the integrated circuit driving chip can be a resistor for respectively limiting the current of a plurality of integrated circuit chip internal circuit modules, or a resistor for limiting the current of all the integrated circuit chip internal circuit modules.

5. The circuit module such as oscillating circuit and driving circuit in chip of claim 3 is all functional modules of said IC driving chip that need current limiting.

6. The built-in buzzer with the reverse connection preventing and oscillator driving chip as claimed in claim 1, wherein the reverse connection preventing means that the buzzer is not damaged when the positive pin of the buzzer is connected with the negative direct current potential and the negative pin of the buzzer is connected with the positive direct current potential within the normal working voltage range of the buzzer.

7. The buzzer with the anti-reverse connection and the oscillator driving chip as claimed in claim 1, wherein the electronic components welded on the circuit board only comprise the integrated circuit driving chip, a single group of electromagnetic coils, a positive pin and a negative pin, and no resistor and capacitor.

8. The buzzer with the built-in anti-reverse connection and oscillator 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 anti-reverse connection and oscillator 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; the single-group electromagnetic coil structure adopting the chip as the driving circuit also has the defects of high starting voltage, no reverse connection and the like.

Chinese patent: 2016101552253, the integrated circuit chip contains a constant voltage power supply, which causes the starting voltage to be higher and the reverse connection is not prevented, the reverse connection is that the positive pin of the buzzer is connected with the negative potential of direct current in the normal working voltage range of the buzzer, the buzzer is not damaged when the negative pin of the buzzer is connected with the positive potential of direct current, and the reverse connection prevention is the basic requirement of the existing electromagnetic active buzzer.

Disclosure of Invention

The invention aims to reduce the cost and the volume and solve the defects of high starting voltage, no reverse connection and the like when an integrated circuit chip is used as an active buzzer driving circuit.

In order to solve the problems, the invention provides a built-in buzzer with an anti-reverse connection and oscillator driving chip, which comprises an integrated circuit driving chip, 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 anode pin and the cathode pin are welded on the circuit board, a power supply of the integrated circuit driving chip is connected with the anode 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 chip internally comprises a current-limiting resistor.

The reverse connection prevention of the buzzer means that the positive pin of the buzzer is connected with a direct current negative potential within the normal working voltage range of the buzzer, and the buzzer cannot be damaged when the negative pin of the buzzer is connected with a direct current positive potential. When the buzzer is reversely connected, namely the positive electrode pin of the buzzer is connected with a direct current negative potential, and the negative electrode pin of the buzzer is connected with a direct current positive potential, the current limiting resistor limits the current flowing through the integrated circuit driving chip, so that the chip and a system using the buzzer are prevented from being damaged.

When the positive pin of the buzzer is connected with a direct current positive potential and the negative pin of the buzzer is connected with a direct current negative potential, 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 of the oscillating circuit, so that the buzzer makes a sound, and the frequency of the sound is determined by the frequency of the internal oscillating circuit of the integrated circuit driving chip.

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

According to the invention, because the power supply of the integrated circuit driving chip is directly connected with the positive pin instead of being indirectly connected with the positive pin through the rectifying circuit, the current flowing through the current-limiting resistor is smaller when the integrated circuit driving chip is started, so that the starting voltage is lower, and if the integrated circuit driving chip does not contain a voltage reference source, the starting voltage is lower.

In conclusion, the invention has the following beneficial effects: a built-in buzzer with an anti-reverse connection and oscillator driving chip has the advantages of low starting voltage, anti-reverse connection 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 built-in buzzer with an anti-reverse connection and oscillator driving chip, which comprises an integrated circuit driving chip 10, 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 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 end VDD of the integrated circuit driving chip 10 is connected with the positive pin 8, the ground wire end GND 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 OUT of the integrated circuit driving chip 10. The integrated circuit driving chip 10 has three pins, which are a power supply terminal VDD, a ground terminal GND, and an output terminal OUT.

As shown in fig. 1, the ic driving chip 10 includes a current limiting resistor, an oscillating circuit, a rectifying circuit, and a driving tube.

Referring to fig. 2, with reference to fig. 1, when the positive pin 8 of the buzzer is connected to a positive dc potential, and the negative pin 9 of the buzzer is connected to a negative dc potential, the integrated circuit drives the internal oscillation circuit of the chip 10 to operate, and outputs a certain frequency signal to the driving circuit to drive the single group of electromagnetic coils 5 through the output terminal OUT, and the vibrating piece 2 makes a sound by the changing magnetic field, and the frequency of the sound is determined by the frequency of the internal oscillation circuit of the integrated circuit driving chip 10. Because the power of the integrated circuit driving chip 10 is directly connected with the positive pin 8, rather than being indirectly connected with the positive pin 8 through the rectifying circuit, the current flowing through the current-limiting resistor is smaller when the integrated circuit driving chip 10 is started, so the starting voltage is lower, if the integrated circuit driving chip 10 does not contain a voltage reference source, the starting voltage is lower, in the range of the operating voltage of the buzzer, the buzzer is reversely connected, namely the positive pin 8 of the buzzer is connected with a direct current negative potential, and when the negative pin 9 of the buzzer is connected with a direct current positive potential, the current flowing through the integrated circuit driving chip is limited by the current-limiting resistor inside the integrated circuit driving chip, thereby playing a role of preventing the chip and a system using the buzzer from being damaged.

In conclusion, the invention has the following beneficial effects: a built-in buzzer with an anti-reverse connection and an oscillator driving chip has the advantages of anti-reverse connection, low starting voltage 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.