Self-excited oscillation buzzer driving circuit
A driving circuit and self-oscillating technology, which is applied to instruments, sounding devices, etc., can solve problems such as brand quality decline, high development process costs, and high hardware costs, and achieve the goals of improving product reliability, shortening the development cycle, and reducing hardware costs. Effect
Pending Publication Date: 2020-12-25
VATTI CORP LTD
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Problems solved by technology
[0003] However, the existing piezoelectric buzzer circuit has the following disadvantages: high hardware cost, waste of IO resources of the single-chip microcomputer, etc.
In the past, many R&D personnel or enterprises ignored the innovation and improvement of this part of the application due to sticking to the rules and the limitations of technological improvement, which directly led to objective phenomena such as low product reliability, high development process costs, and brand quality decline.
Method used
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[0022] An embodiment of the present invention provides a self-oscillating buzzer drive circuit, such as figure 1 As shown, it includes a self-excited oscillation module 1 and a buzzer sounding module 2, the self-excited oscillation module 1 is electrically connected to the buzzer sounding module 2, and the self-excited oscillation module 1 is used to generate a PWM signal, thereby making the The buzzer sounding module 2 drives the buzzer to sound according to the PWM signal.
[0023] In this way, the self-excited oscillation module 1 changes the current direction of the transformer by turning on and off the internal triode to generate a PWM signal, and then makes the buzzer sounding module 2 drive the buzzer to sound according to the PWM signal, that is, through self-excited oscillation without The buzzer drive circuit controlled by the MCU realizes the output of the buzzer sound function of household appliances, realizes the resonant sound of the passive piezoelectric buzzer,...
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The invention discloses a self-excited oscillation buzzer driving circuit, which comprises a self-excited oscillation module and a buzzer sound production module, and is characterized in that the self-excited oscillation module is electrically connected with the buzzer sound production module, and the self-excited oscillation module is used for generating a PWM signal, so that the buzzer sound production module drives a buzzer to produce sound according to the PWM signal. According to the self-excited oscillation buzzer driving circuit, household appliance buzzing prompt tone function output is achieved through the self-excited oscillation buzzer driving circuit without MCU control, resonance sounding of a passive piezoelectric buzzer is achieved, single-chip microcomputer control is abandoned, hardware cost in the design process is reduced, development efficiency of developers is improved, and the self-excited oscillation buzzer driving circuit is suitable for popularization and application. The development period is shortened, and a foundation is laid for improving product reliability.
Description
technical field [0001] The invention belongs to the technical field of buzzers, and in particular relates to a self-oscillating buzzer drive circuit. Background technique [0002] Buzzers are installed in various kitchen appliances such as range hoods and steam ovens. The buzzer circuit on the market generally adopts a piezoelectric buzzer circuit controlled by "dual IO + triode". [0003] However, the existing piezoelectric buzzer circuit has the following disadvantages: high hardware cost, waste of IO resources of the single-chip microcomputer, and the like. In the past, many R&D personnel or enterprises ignored the innovation and improvement of this part of the application due to sticking to the rules and limitations of technological improvement, which directly led to objective phenomena such as low product reliability, high development process costs, and brand quality decline. Contents of the invention [0004] In order to solve the above-mentioned problems, the prese...
Claims
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IPC IPC(8): G10K9/122
CPCG10K9/122
Inventor 李耀聪潘叶江
Owner VATTI CORP LTD