A low dropout (LDO) regulator for generating an output voltage on an output from an input voltage of an input source. The LDO regulator including a switch module to generate the output voltage. The switch module including at least two parallel connected switches responsive to corresponding switch control signals to regulate a flow of energy from the input source to the output. Each of the switches having an on-state and an off-state. A digital controller to sense the output voltage and in response to generate the switch control signals such that the output voltage is regulated to a predetermined amplitude.

Digital low dropout regulator

A fluid cooled RF transmission cable, transformer primary or secondary winding, and induction heating coil incorporating litz cable is disclosed. The heating coil comprises: a litz cable including a bundle of mutually electrically insulated, intermixed wire filaments, and a coolant tube, surrounding the litz wire, for conveying a fluid for removing heat generated by the litz cable. Also a combined coolant and electrical connector for providing an electrical connection and coolant to an inductive heating coil including a coolant tube and a litz cable housed inside the coolant tube is described. The connector comprises a tubular conductive member having an inner bore extending through the member, a distal end of the member sealably joining a terminal end of the coolant tube, to place the inner bore in communication with inside of the coolant tube, the litz cable extending into the inner bore and terminating in a low resistance electrical connection to the member, a proximal end of the member adapted for connection to one of a coolant source and a coolant intake.

Fluid cooled litz coil inductive heater and connector therefor

A power inductor includes a magnetic core material having first and second ends. An inner cavity arranged in the magnetic core material extends from the first end to the second end. A conductor passes through the cavity. A slotted air gap arranged in the magnetic core material extends from the first end to the second end.

Power inductor with reduced DC current saturation

A control system comprises a DC/DC converter that includes first and second inductances, that receives a first DC voltage and that generates a second DC voltage. A control module selectively charges or discharges the first inductance while discharging or charging the second inductance during a first mode and one of charges both of the first and second inductances or discharges both of the first and second inductances during a second mode.

Closed-loop digital control system for a dc/dc converter

To prepare a re-usable lithographic printing plate for printing, an imaging deposit is projected on the plate surface by jet printing using an ejectable substance containing a heat fusible component. The substance forms an imaging deposit which is fused to the surface of the printing plate (1) using a variable frequency and variable power induction heater (5). After printing the imaging, the deposit can be removed from the surface of the printing plate (1) using the same variable frequency induction heater (5) but transferring heat energy at a higher effective energy level to the fusible substance.

Method and system for fusing printing image deposits on surfaces of a printing substrate, and removal thereof for re-use of the surface

A radio frequency induction heater for locally heating a metallic work piece. The induction heater comprises an elongated conductor surrounded by a core of magnetic material having a narrow slot formed therein serving as the inductor core air gap. The conductor is connected across a source of radio frequency current. The induction heater is located adjacent the metallic work piece with the inductor core air gap very near (and preferably in contact with) that portion of the metallic work piece to be heated. When the radio frequency current is caused to pass through the conductor, the gap concentrates the flux entering the work piece, inducing voltages in the work piece resulting in eddy currents which flow in the work piece along and parallel to the gap. This, in turn, results in the rapid local heating of a narrow band of the work piece.

Margerum David Earl

Papers

Radio frequency induction heating device