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Title:
PWM出力回路
Document Type and Number:
Japanese Patent JP4704260
Kind Code:
B2
Abstract:
A PWM circuit includes a counter, a cycle register, a cycle detector, a pulse width register, a pulse width detector, an additional pulse width register, a voltage generator, a selector, and a voltage controller. The voltage controller controls the selector so as to add a first additional pulse at a first voltage to the end of a pulse width, based on a cycle detection signal outputted by the cycle detector, a pulse width detection signal outputted by the pulse width detector, and a set value indicating the first voltage of the first additional pulse outputted by the additional pulse register, thereby deciding a voltage outputted from the PWM circuit and a period in which the voltage is output.

Inventors:
Satoshi Matsui
Application Number:
JP2006086372A
Publication Date:
June 15, 2011
Filing Date:
March 27, 2006
Export Citation:
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Assignee:
Fujitsu Semiconductor Limited
International Classes:
H03K7/08; H03K4/02
Domestic Patent References:
JP7183779A
JP6235709A
JP6245217A
JP398470A
JP423511A
JP4275590A
Attorney, Agent or Firm:
Furuya Fumio
Toshihide Mori



 
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