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US 6,208,532 B1Granted
Switched-mode power supply that clock-pulse controls a switching element for supplying a rectified AC voltage to a primary winding of a transformer of the power supply
AssigneeSiemens Aktiengesellschaft
InventorPeter Preller
Life of this patent
Estimating the term…
Abstract
The switched-mode power supply has a transformer with an E-shaped core. Each side limb of the core is surrounded by a winding. The flow of current through the secondary winding is controlled by the output voltage to be regulated. A control signal for controlling the switching frequency of the power supply is decoupled at the primary side winding. This makes it possible to dispense with an optical coupler which would otherwise be necessary.
Claims6
Switched-mode power supply, comprising:
- a transformer having a primary winding receiving a rectified AC voltage and a secondary winding outputting a rectified output voltage, said transformer having an E-shaped core with a middle limb surrounded by said primary winding and said secondary winding and with a first outer limb and a second outer limb;
- a first winding around said first outer limb for conducting a current controlled in dependence on the output voltage, and a second winding around said second outer limb for generating a control signal;
- a switching element connected to said primary winding of said transformer for supplying a rectified AC voltage to said primary winding;
- and
- a control device connected to said switching element for clock-pulse controlling said switching element in dependence on the control signal.
2 more elements
Dependencies are inferred from the claim text.