发明名称 |
SWITCHING POWER SUPPLY AND REGULATION CIRCUIT |
摘要 |
The present invention provides a switching power supply that enables a reduction in noise without the need for an anti-noise component such as a filter circuit. A secondary current on period detecting circuit detects a first period during which a secondary current flows, the secondary current starting to flow through a secondary winding after a switching element is turned off. A secondary current on duty control circuit oscillates a clock signal set turning on the switching element so as to maintain, at a constant value, an on duty ratio of the first period to a third period made up of the first period and a second period during which the secondary current does not flow. A secondary current on duty modulating circuit applies a modulation component to the on duty ratio to periodically modulate the on duty ratio and thus the oscillation frequency of the switching element.
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申请公布号 |
US2008309303(A1) |
申请公布日期 |
2008.12.18 |
申请号 |
US20080128652 |
申请日期 |
2008.05.29 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
MOROTA NAOHIKO;MORI YOSHIHIRO |
分类号 |
G05F1/10 |
主分类号 |
G05F1/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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