发明授权
- 专利标题: Pump drive circuit
- 专利标题(中): 泵驱动电路
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申请号: US437370申请日: 1982-10-28
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公开(公告)号: US4463269A公开(公告)日: 1984-07-31
- 发明人: Hiroyuki Yashima
- 申请人: Hiroyuki Yashima
- 申请人地址: JPX Tokyo
- 专利权人: Olympus Optical Co., Ltd.
- 当前专利权人: Olympus Optical Co., Ltd.
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX56-176235 19811102; JPX56-176916 19811104
- 主分类号: H02M1/10
- IPC分类号: H02M1/10 ; H02P4/00 ; H02J13/00 ; G05F5/00
摘要:
In a pump drive circuit, a power source voltage signal supplied to the pump is phase-controlled by a triac connected between the pump and the power source. The period of triggering the triac is determined by a time constant circuit of a UJT, a capacitor and a resistor circuit. The power source voltage signal has its frequency determined by a frequency discrimination circuit. The resistance value of the resistor circuit is selected in accordance with the result of the discrimination. Accordingly, the pump is applied with a voltage signal the phase of which is controlled in accordance with the power source frequency, and is thus driven to maintain a predetermined output.
公开/授权文献
- US5578437A Color photographic light-sensitive material 公开/授权日:1996-11-26