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A buzzer drive circuit

A technology for driving circuits and buzzers, which is applied to instruments, sounding devices, etc., can solve the problems of inability to discharge energy, complex control circuit structures, and smaller sound pressure of piezoelectric buzzers, and achieve good consistency. , Improve the pass rate, good sound pressure consistency

Active Publication Date: 2022-01-07
SHENZHEN NANYUN MICROELECTRONICS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this solution is that the control circuit needs to add a judgment strategy to identify two different types of buzzers. The structure of the control circuit is complicated. In addition, the impedance of the discharge circuit through the 1K resistance is different from the impedance of the charging circuit, which will lead to When the duty cycle is large, the complete energy discharge cannot be achieved, so that there is a DC component at both ends of the piezoelectric buzzer, and this DC component will cause the sound pressure of the piezoelectric buzzer to decrease

Method used

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  • A buzzer drive circuit
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Embodiment 1

[0046] Such as figure 2 Shown is the circuit control logic block diagram of Embodiment 1 of the present invention, including a voltage follower, PWM comparator module 102, logic and drive module 103, oscillator 104, LDO module 105, loop control electronic switch 106, sampling circuit 107 , freewheeling electronic switch 108 , delay module 109 , first bootstrap module 110 . Wherein, the voltage follower includes a feedforward compensation module 100 and a controlled voltage source circuit 101 .

[0047] The reference terminal D of the loop control electronic switch 106 is connected to the negative terminal of the buzzer, and the output terminal S is grounded after passing through the sampling circuit 107 . The reference terminal D of the freewheeling electronic switch 108 is connected to the positive terminal of the buzzer 109 , and the output terminal S is connected to the negative terminal of the buzzer 109 , thereby being connected in parallel with the buzzer 109 . When t...

Embodiment 2

[0072] Figure 9 It is a circuit control logic block diagram of Embodiment 2 of the present invention, and the circuit principle of Embodiment 2 is to use a full-bridge solution. The advantage of the second embodiment is that the sound pressure of the piezoelectric buzzer is higher under the same input voltage VIN.

[0073] Compared with Embodiment 1, the circuit of Embodiment 2 has more first switching electronic switch 111 and second switching electronic switch 112, and controls electronic switch 106, freewheeling electronic switch 108, first switching electronic switch 111 and second switching electronic switch 112 through the loop. The electronic switch 112 constitutes a typical full bridge circuit structure. As shown in the figure, the first switching electronic switch 111 and the second switching electronic switch 112 both use MOS transistors, the gate of the MOS transistor is a control terminal, the drain is a reference terminal, and the source is an output terminal. ...

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Abstract

The invention discloses a buzzer driving circuit, which comprises a loop control electronic switch, a freewheeling electronic switch, a voltage follower, a PWM comparator module, a delay module, a logic and driving module, a sampling circuit and an oscillator; the voltage follower The input terminal of the device is connected to the positive pole of the input voltage, and the voltage follower outputs a comparison voltage to the inverting input terminal of the PWM comparator module; the sampling circuit samples the current on the series loop, and the sampling circuit outputs the sampling signal to the delay module, and the delay module outputs The voltage signal is sent to the non-inverting input terminal of the PWM comparator module; the output terminal of the PWM comparator module is connected to the reset terminal of the logic and driver module, the oscillator outputs the clock signal to the set terminal of the logic and driver module, and the output of the logic and driver module Terminal Q is connected to the control terminal of the loop control electronic switch, and the output terminal Q of the logic and drive module is not connected to the control terminal of the freewheeling electronic switch. The invention can drive electromagnetic buzzer and piezoelectric buzzer compatiblely.

Description

technical field [0001] The invention relates to a buzzer, in particular to a buzzer driving circuit. Background technique [0002] The traditional separately excited electromagnetic buzzer drive circuit generally adopts a single-tube drive mode, and the reset circuit generally uses a diode magnetic reset or an anti-peak clamp circuit to achieve magnetic reset. [0003] Such as the Chinese patent of the patent document authorization number CN104575479B, which discloses an active square wave drive circuit for an electromagnetic buzzer. The drive circuit adopts a single-tube drive structure, and its operating frequency and duty cycle are all fixed values; When an electromagnetic buzzer with fixed parameters uses this drive circuit, its specific current can only be configured for a specific input voltage by connecting a resistor in series with the input port; if the electromagnetic buzzer with configured parameters is applied to When other input voltages are used, the current f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10K9/125G10K9/13
CPCG10K9/125G10K9/13
Inventor 尹向阳黄天华
Owner SHENZHEN NANYUN MICROELECTRONICS CO LTD