Title: Power supply

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Abstract: A linear DC power supply provides high efficiency with substantially lower total capacitance than prior art linear DC power supplies. The power supply includes first and second input terminals, first and second output terminals, a center tap transformer, first and second capacitors, first and second charging circuits, and first and second discharging circuits. The center tap transformer has a primary connected to the first and second input terminals and has a secondary with first and second phase terminals and a center tap terminal which is connected to the second output terminal. The first charging circuit is connected to the secondary and the first capacitor to fully charge the first capacitor during a first portion of each cycle. Similarly, the second charging circuit is connected to the secondary for fully charging the second capacitor during a second portion of each cycle. The first discharging circuit connects the first capacitor to the first output terminal and permits the first capacitor to fully discharge during a third portion of each cycle. The second discharging circuit connects the second capacitor to the first output terminal and permits the second capacitor to fully discharge during a fourth portion of each cycle. The total capacitance of the power supply is significantly reduced by permitting the first and second capacitors to fully charge and discharge during each cycle. As a result, the differential voltage across the capacitors is much greater than in conventional linear power supplies, in which a DC voltage and a small ripple voltage are maintained across a filter capacitor.


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