AC/DC power supply
OwnerCarmeli Adahaninventor
Life of this patent
Estimating the term…
Abstract
An AC/DC power supply includes an input sensing circuit for sensing whether the input connector is connected to an AC voltage source or to a relatively lower amplitude DC voltage source. When connected to the AC voltage source, a control circuit connects an input rectifier to the input circuit and also connects two primary windings of a power transformer in boosting relation to the output circuit. When the input connector is connected to the DC voltage source, the control circuit bypasses the input rectifier with respect to the input circuit, and connects only one of the primary windings to the output circuit while bypassing the other primary winding.
Claims18
An AC/DC power supply, comprising:
- an input connector for connection to an AC voltage source or a DC voltage source;
- an input rectifier;
- an output circuit including a power transformer having at least two primary windings;
- a switching circuit outputting pulses to the primary windings of the power transformer;
- an input sensing circuit for sensing whether said input connector is connected to said AC voltage source or said DC voltage source;
- and a control circuit controlled by said input sensing circuit and effective, when said input connector is connected to said AC voltage source, to connect said input rectifier to said input connector and also to connect both primary windings in boosting relation to the output circuit;
- and when said input connector is connected to said DC voltage source, to bypass said input rectifier with respect to said input circuit, and to connect only one of said primary windings to the output circuit while bypassing another primary winding, such that coupling to the output circuit is maximized when aid input connector is connected to an AC voltage source, and the Voltage drop in the power transformer is minimized when the input connector is connected to DC voltage source.
An AC/DC power supply connectable to an AC input voltage source or to a DC input voltage source of amplitude substantially lower than that of the AC input voltage source, comprising:
- a rectifier for rectifying the input when the input is AC;
- a power transformer including at least two primary windings;
- a switching circuit outputting pulses to the power transformer when the input is either AC or DC;
- an input sensing circuit for sensing the amplitude of the input voltage and for determining thereby whether the input is AC or DC;
- and a control circuit controlled by said input sensing circuit for controlling the power transformer to connect the two primary windings in boosting relation with respect to the output circuit when the input is AC, and to bypass one of the primary windings and the rectifier with respect to the output circuit when the input is DC.
Dependencies are inferred from the claim text.