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US 4,156,273 AGranted
Protection of a switching regulator
AssigneesSanyo Electric Co., Ltd., Tokyo Sanyo Electric Co., Ltd.
InventorTakehisa Sato
Life of this patent
Estimating the term…
Abstract
A transformer coupled switching regulator power supply having current-limiting circuits and under-voltage detecting circuits on the primary side of the power transformer. The under-voltage detection circuit acts to substantially terminate the flow of current through the switching circuits in the case of a short circuit in the load.
Claims15
A switching regulator power supply, comprising:
- alternating current power supply means;
- first rectifying means coupled to said alternating current supply means for rectifying the alternating current output;
- means for generating high frequency pulses the duty cycle of which is variable as a function of a control signal;
- switching means coupled to said first rectifying means and responsive to the output of said high frequency pulse generating means for on/off controlling the rectified output from said first rectifying means;
- high frequency transformer means including a primary winding coupled to receive the output from said switching means, a secondary winding, and a first auxiliary winding on the primary winding side of said transformer means;
- second rectifying means coupled to said secondary winding of said high frequency transformer means for rectifying the transformed output from said high frequency transformer means;
- means for supplying the rectified output from said second rectifying means to said high frequency pulse generating means as said control signal;
- means operatively coupled to said switching means for detecting a current flowing through said switching means;
- means coupled to said first auxiliary winding for detecting a voltage corresponding to the output of said switching means;
- means coupled to said current detecting means and said voltage detecting means for detecting a difference between the output from said current detecting means and the output from said voltage detecting means;
- and
- means operatively coupled to said high frequency pulse generating means and responsive to the difference detected output from said difference detecting means for reducing the duty cycle of the high frequency pulse obtainable from said high frequency pulse generating means, whereby a current flowing through said switching means is controlled to a value less than a current value set by said current detecting means whenever a given value of overload occurs.
9 more elements
A switching regulator, comprising:
- alternate current power supply means;
- first rectifying means coupled to said alternate current power supply means for rectifying the alternate current output;
- means for generating high frequency pulses the duty cycle of which is variable as a function of a control signal;
- switching means coupled to said first rectifying means and responsive to the output of said high frequency pulse generating means for on/off controlling the rectified output from said first rectifying means;
- high frequency transformer means coupled to receive the output from said switching means, and including first auxiliary winding means;
- second rectifying means coupled to said high frequency transformer means for rectifying the transformed output from said high frequency transformer means;
- means for supplying the rectified output from said second rectifying means to said high frequency pulse generating means as said control signal;
- means operatively coupled to said switching means for detecting a current flowing through said switching means;
- means coupled to said current detecting means and said first auxiliary winding means for detecting a difference between the output from said current detecting means and the output from said first auxiliary winding means;
- means operatively coupled to said high frequency pulse generating means and responsive to the difference detected output from said difference detecting means for reducing the duty cycle of the high frequency pulse obtainable from said high frequency pulse generating means, whereby a current flowing through said switching means is controlled to a lesser value whenever a given value of overload occurs;
- and
- third rectifying means coupled to said first auxiliary winding means for withdrawing the rectified output to said difference detecting means in the polarity opposite to that of the output of said current detecting means.
9 more elements
Dependencies are inferred from the claim text.