US 8,411,475 B1 · Power supply converting AC to DC and using changing voltage of AC to force DC into a load

Abstract

A power supply to convert AC power to DC power with a relatively constant voltage and linear current delivery. The DC power may be positive or negative voltage, or both may be produced. A fluctuating voltage from an AC voltage source (e.g., a transformer) is utilized to charge and substantially discharge a storage device on a cycle by cycle basis. The voltage of the storage device continuously supplements the fluctuating voltage to result in relatively constant voltage. Unlike a typical power supply, (a) the discharge of the storage device forces power into a load, (b) total capacitance may be substantially less than (e.g., 1% or less of) the capacitance of a typical power supply, (c) a shunt capacitor is not required, and (d) the transformer may be continuously utilized throughout the entire cycle (rather than for only a brief portion of each cycle), which may reduce noise.

Claims13

Dependent claims

A power supply to convert Alternating Current (AC) power to Direct Current (DC) power having a relatively constant voltage, the power supply comprising:

a center tap transformer to provide AC power, wherein a center tap of the center tap transformer is connected to a common point and a return of a load;
a first capacitor connected directly to a first tap of the center tap transformer;
a first diode connected between a second tap of the center tap transformer and the first capacitor;
a second capacitor connected directly to the second tap of the center tap transformer;
and
a second diode connected between the first tap of the center tap transformer and the second capacitor,
wherein on a cycle by cycle basis:
the first capacitor is charged via its direct connection to the first tap and the first diode connected between the first capacitor and the second tap to twice maximum voltage from the common point,
the second capacitor is charged via its direct connection to the second tap and the second diode connected between the second capacitor and the first tap to twice the maximum voltage from the common point,
the first capacitor is forced to discharge into the load by its direct connection to the first tap, and
the second capacitor is forced to discharge into the load by its direct connection to the second tap.

8 more elements

A power supply to convert Alternating Current (AC) power to Direct Current (DC) power having a relatively constant voltage, the power supply comprising:

a transformer to provide AC power;
a first capacitor connected directly to a first tap of the transformer;
a first diode connected between a second tap of the transformer and the first capacitor;
a second capacitor connected directly to the second tap of the transformer;
a second diode connected between the first tap of the transformer and the second capacitor,
a third diode to connect the first tap of the transformer to a common point and a return of a load;
a fourth diode to connect the second tap to the common point and the return of the load;
and a shunt capacitor,
wherein the first and the second diodes are to convert the AC power to DC power having a first voltage that varies from the common point to a maximum voltage from the common point,
wherein on a cycle by cycle basis:
the first capacitor is charged by the second tap via the first diode,
the second capacitor is charged by the first tap via the second diode, the first capacitor is forced to discharge into the load by its direct connection to the first tap, and
the second capacitor is forced to discharge into the load by its direct connection to the second tap,
wherein discharging the first and the second capacitors provides a second voltage to supplement the first voltage for a portion of each cycle, and
wherein the shunt capacitor is to be charged by the transformer via the first diode and the second diode and to provide a third voltage for a portion of each cycle when the first voltage and the second voltage are is not being provided.

12 more elements

Dependencies are inferred from the claim text.

Power supply converting AC to DC and using changing voltage of AC to force DC into a load

Life of this patent

Power supply converting AC to DC and using changing voltage of AC to force DC into a load

Life of this patent

Abstract

Claims13