发明授权
US07683597B2 PWM signal generating circuit and power supply apparatus comprising such PWM signal generating circuit
有权
PWM信号发生电路和包括这种PWM信号发生电路的电源装置
- 专利标题: PWM signal generating circuit and power supply apparatus comprising such PWM signal generating circuit
- 专利标题(中): PWM信号发生电路和包括这种PWM信号发生电路的电源装置
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申请号: US11865743申请日: 2007-10-02
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公开(公告)号: US07683597B2公开(公告)日: 2010-03-23
- 发明人: Takae Shimada , Fumikazu Takahashi , Hiroyuki Shoji , Yoshihide Takahashi , Wataru Mochizuki
- 申请人: Takae Shimada , Fumikazu Takahashi , Hiroyuki Shoji , Yoshihide Takahashi , Wataru Mochizuki
- 申请人地址: JP Kanagawa
- 专利权人: Hitachi Computer Peripherals Co., Ltd.
- 当前专利权人: Hitachi Computer Peripherals Co., Ltd.
- 当前专利权人地址: JP Kanagawa
- 代理机构: Antonelli, Terry, Stout & Kraus, LLP.
- 优先权: JP2006-270795 20061002
- 主分类号: G05F1/00
- IPC分类号: G05F1/00 ; H03K3/017
摘要:
To provide a power supply apparatus having high control resolution of an output power. A PWM signal generating circuit includes: a non-inverting element 31, and an inverting element 32; and further includes a counter 11 for performing count operation in response to rising of a clock signal, a counter 12 for performing count operation in response to falling of the clock signal, comparison circuits 21, 22, and a multiplexer 20. These circuit elements are controlled by PWM control means 10. As another circuit element, the PWM signal generating circuit includes a logical sum element 33. The PWM signal generating circuit serves to arbitrarily change both period and logic “H” time of a PWM signal to be outputted at a time interval which is one half of the clock period. Thus, there is provided a power supply apparatus in which resolution of a PWM signal has been improved within a broad duty range, and fine control of an output power has been performed within a broad output power range.