Switched-mode power supply
First Claim
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1. A switched-mode power supply, comprising:
- a rectifier configuration having an output supplying a rectified voltage;
a transformer having a primary winding connected to said rectifier configuration and a secondary winding;
a switching transistor connected to said primary winding for a clocked application of the rectified voltage to said primary winding;
a drive unit for driving said switching transistor, said drive unit being coupled to said secondary winding and being D.C.-isolated from said switching transistor; and
a voltage source connected on a secondary side of said transformer for providing an operating voltage to said drive unit during a startup of the switched-mode power supply.
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Abstract
The invention relates to a switched mode power supply, whereby the number of components is reduced to a considerable extent in comparison with conventional switched mode power supplies. The switching transistor of the switched mode power supply is controlled by a processor on the secondary side of said switched mode power supply. Control thereof is determined by the software of the processor and can be slightly modified and adapted. The required processor functions can be taken over by a processor that is already contained in the device which is powered by the switched mode power supply.
13 Citations
5 Claims
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1. A switched-mode power supply, comprising:
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a rectifier configuration having an output supplying a rectified voltage;
a transformer having a primary winding connected to said rectifier configuration and a secondary winding;
a switching transistor connected to said primary winding for a clocked application of the rectified voltage to said primary winding;
a drive unit for driving said switching transistor, said drive unit being coupled to said secondary winding and being D.C.-isolated from said switching transistor; and
a voltage source connected on a secondary side of said transformer for providing an operating voltage to said drive unit during a startup of the switched-mode power supply. - View Dependent Claims (2, 3, 4, 5)
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Specification
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Current AssigneeSiemens AG
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Original AssigneeInfineon Technologies AG
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InventorsPreller, Peter
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Primary Examiner(s)Wong, Peter S.
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Assistant Examiner(s)Laxton, Gary L.
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Application NumberUS09/789,344Publication NumberTime in Patent Office259 DaysField of Search363/16, 363/20, 363/21.04, 363/21.08, 363/97, 363/131, 363/49US Class Current363/21.04CPC Class CodesH02M 3/33515 with digital control
