Switching power supply system and process
First Claim
1. A switching power supply system comprising:
- a semiconductor switching device for selectively opening and closing a current path from a dc power source to a load;
an inductive component connected in series with the switching device;
a series combination of a first diode and a voltage clamp which are connected in series with each other, the series combination being connected in parallel to one of the switching device and the inductive component; and
a control circuit for controlling the switching device;
wherein the first diode has a carrier lifetime which is equal to or longer than a switching period of the switching device.
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Accused Products
Abstract
A switching power supply system comprises a semiconductor switching device for selectively opening and closing a current path from a dc power source to a load, an inductive component connected in series with the switching device, a series combination of a first diode and a voltage clamp, and a control circuit for controlling the switching device. The series combination is connected in parallel to the switching device or the inductive component such as a transformer or an inductor. The first diode has a carrier lifetime equal to or longer than the switching period of the switching device. A discharge circuit is connected between one terminal of the dc power source and a branch point between the first diode and the voltage clamp, and arranged to regulate an amount of energy returned from the voltage clamp to the dc power source.
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Citations
25 Claims
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1. A switching power supply system comprising:
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a semiconductor switching device for selectively opening and closing a current path from a dc power source to a load; an inductive component connected in series with the switching device; a series combination of a first diode and a voltage clamp which are connected in series with each other, the series combination being connected in parallel to one of the switching device and the inductive component; and a control circuit for controlling the switching device; wherein the first diode has a carrier lifetime which is equal to or longer than a switching period of the switching device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 20, 21, 22, 23, 24, 25)
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16. A control process for controlling a switching power supply system comprising a semiconductor switching device for periodically opening and closing a circuit for supplying power from a dc power source to a load, an inductive component connected in series with the switching device, a capacitive component connected across the switching device, a series combination of a first diode and a voltage clamp which are connected in series with each other, the series combination being connected in parallel to one of the switching device and the inductive component, and a control circuit for controlling the switching device, the control process comprising:
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a first step for transferring energy stored in the inductive component during an on period of the semiconductor switching device, to the voltage clamp during an off period of the switching device by utilizing forward conduction of the first diode; a second step for returning most of the energy stored in the voltage clamp through the inductive component to the dc power source by reverse conduction of the first diode; and a third step for turning on the semiconductor switching device after the second step, a switching period of the semiconductor switching device being shorter than a carrier lifetime of the first diode. - View Dependent Claims (17, 18, 19)
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Specification