A power supply for converting a low DC voltage, in particular a DC voltage delivered from a sea water galvanic cell (or solar cell), into a DC voltage useful for normal electronic equipment includes a number of MOS-FET transistors connected in parallel to an output transformer. The transformer has a number of primary windings distributed on a toroidal ferrite core so as to interact with the secondary winding of the transformer.

A regulated switching power supply is disclosed in which the high current set point, during regulation, is the peak (170a) of the regulated current instead of the peak (170) of the line frequency noise. The alternating current (14) is rectified (44, 46) and filtered (52, 54) and the output voltage is sensed and fed back (80) to an error amplifier (86) which provides an error signal that is repsponsive to the output voltage. The current levels is sensed (160) and a current sensing signal is provi...

A power supply is provided, by which power consumption of an electrical apparatus having a normal mode and a standby mode is reduced by including a dedicated power converter for the standby mode, to increase operational efficiency by means of feeding back an output voltage in standby mode to supply a constant voltage. The power supply includes a DC power unit for outputting a DC voltage; a microcomputer for outputting a mode control signal according to the operational mode of the electrical appa...

There are provided an inductive load current control circuit for detecting and controlling a current flowing to an inductive load with high accuracy, and a power supply.The inductive load current control circuit includes first and second switch elements connected in series between an input voltage and a ground potential, an inductive load connected to a connection point between the first and second switch elements, a third switch element having one terminal connected to the connection point betw...

A rechargeable power supply including voltage protection means through voltage dependent disconnecting means. A rechargeable power supply comprises at least one rechargeable cell connectable to a power source, a Zener diode connected to the at least one cell, and a bipolar transistor or a FET for selectively disconnecting the Zener diode from the cell in order to reduce any discharge of the cell through the voltage protection means. The Zener diode and the transistor are connected together in se...

An output detection feedback section (5) for controlling the power supply output voltage of a converter unit (4) in response to an error signal Ve has an error amplifier (26) for outputting the error signal Ve, a phase compensation circuit (41), a state detection circuit (42), and a response compensation circuit (43) for setting the voltage of a capacitor (29) of the phase compensation circuit (41) to a predetermined value. When output voltage is switched, the output voltage is fixed at the pred...

The present invention is a power supply (10) that starts a load (20) with a heavy start-up power draw from a power grid (12) and then switches the load to a generator (22) for lower power draw operation thereby avoiding the need for a large capacity generator capable of initial start-up of the load (20). The power supply comprises a conductor (15) for connecting to a power grid, an electrical power generation device (30), an electrical power using device or load (20) and a switching mechanism (4...

A modular, low weight impedance dropping power supply with battery backup is disclosed that can be connected to a high voltage AC source and provide electrical power at a lower voltage. The design can be scaled over a wide range of input voltages and over a wide range of output voltages and delivered power.

In one embodiment, a foam ink supply includes: a chamber defined by a ceiling, a floor, and a wall between the ceiling and the floor; an outlet from the chamber; and a block of foam only partially filling the chamber, the block of foam positioned adjacent to the outlet and spaced apart from at least part of the wall.

A power supply, including a step-up converter, a resonant converter, and control unit. The step-up converter is connected to the resonant converter; the step-up converter and the resonant converter are each connected to the primary control unit.