Output circuit capable of driving a vibration device
US5387875A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 21, 1994 |
| Grant date | Feb 7, 1995 |
| Priority date | — |
| Expiry date | Jan 21, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2460/03
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In an output circuit for pulse width modulation of an input signal and output of it to a predetermined vibrating section, power consumption is remarkably reduced with a comparatively simple configuration. The output circuit with a comparatively simple configuration which can drive a vibrating section at high efficiency without consuming unnecessary power can be realized by providing a polarity inverter circuit which inverts the polarity of an input signal and outputs it as an inverted input signal, comparing the instantaneous level of the input signal with that of the output signal from an oscillator circuit by a first comparator circuit, comparing the instantaneous level of the inverted input signal with that of an output signal from the oscillator circuit by a second comparator circuit, and thereafter, forming a drive signal based on the first and second comparison results and sending it to a drive section, thus obtaining the formation of a drive signal having a duty ratio corresponding to the instantaneous amplitude of the input signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.