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Buzzer driving circuit and calculator circuit with same

A driving circuit and buzzer technology, applied in computing, computers, digital computer parts, etc., can solve the problems of increasing manufacturing steps and production costs, and achieve the effects of reducing energy consumption, reducing requirements, and saving costs

Active Publication Date: 2013-03-20
CRM ICBG (WUXI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, an additional coupling capacitor must be added for each driving circuit in use, increasing manufacturing steps and production costs

Method used

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  • Buzzer driving circuit and calculator circuit with same
  • Buzzer driving circuit and calculator circuit with same
  • Buzzer driving circuit and calculator circuit with same

Examples

Experimental program
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Embodiment Construction

[0028] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

[0029] image 3 It is a structural block diagram of an embodiment of the key tone calculator circuit provided by the present invention. From image 3 It can be seen that the key tone calculator circuit 300 provided by the present invention includes the following parts:

[0030] 1. Power-on reset unit 310: used to generate a power-on reset signal so that the system executes a power-on reset initialization process. In the figure, VDD is the power supply voltage, and GND is the ground.

[0031] 2. Oscillator 320: A built-in RC oscillator is used to generate an oscillation clock for the system clock module 330 to generate various clock signals required by the system.

[0032] 3. System clock module 330: According to the oscillation clock input by the oscillator 320, vario...

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PUM

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Abstract

The invention provides a buzzer driving circuit which comprises an output unit. The output unit comprises a first key sound pin and a second key sound pin and is used for outputting a driving signal to a buzzer. The first key sound pin and the second key sound pin output opposite square waves when the buzzer works and output the same level when the buzzer is idle. The invention also provides a calculator circuit. The buzzer driving circuit provided by the invention is adopted in the calculator circuit. When the buzzer driving circuit and the calculator circuit with the buzzer driving circuit, which are provided by the invention, are used for the buzzer with low DC (direct current) impedance, the phenomenon of electric leakage which is commonly generated when the buzzer is idle cannot be generated.

Description

Technical field [0001] The present invention relates to the technical field of buzzer drive circuits, in particular to a piezoelectric buzzer drive circuit and a calculator circuit with the drive circuit. Background technique [0002] Among portable products, calculators are the most common one. From the perspective of pronunciation, it can be divided into non-sound calculator, key tone calculator, language calculator, etc. Among them, the key tone calculator generally sounds by driving a piezoelectric buzzer. Piezoelectric buzzer is made by vibrating the metal sheet by the ceramic sheet of piezoelectric effect. Piezoelectric buzzers generally adhere the piezoelectric ceramic sheet after high-voltage extreme pressure to the vibrating metal sheet. When an AC voltage is applied, the piezoelectric ceramic sheet undergoes mechanical deformation, expansion and contraction due to the piezoelectric effect, and uses this characteristic to make the metal sheet vibrate and make a sound....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10K9/12G06F15/02
Inventor 陈长华杨桂萍赵海薛中耿玲陆健
Owner CRM ICBG (WUXI) CO LTD
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