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Henk Houkes, Jan W Denneman, Pieter Postma: Discharge lamp with interference shielding. U S Philips Corporation, Robert S Smith, February 4, 1986: US04568859 (60 worldwide citation)

A discharge lamp having a sealed glass vessel filled with gas and a metal vapor, operated with a supply at a frequency of at least 20 kHz. An interference-suppressing conductive layer is arranged on a wall surface surrounding the discharge, and connected to an electric supply lead-in wire. Preferabl ...


2
Henk Houkes, Pieter Postma, Andreas G Van Veghel: Electrodeless low-pressure discharge lamp. U S Philips Corporation, Emmanuel J Lobato, February 23, 1988: US04727294 (47 worldwide citation)

An electrodeless low-pressure discharge lamp comprising a lamp vessel (1) which is sealed in a vacuum-tight manner and is filled with a metal vapor (for example mercury) and a rare gas, this lamp being provided with a core (4) of magnetic material (for example ferrite), while during operation of the ...


3
Henk Houkes, Pieter Postma, Andreas C Van Veghel: Electrodeless low-pressure discharge lamp. U S Philips Corporation, David R Treacy, December 1, 1987: US04710678 (42 worldwide citation)

An electrodeless low-pressure discharge lamp having a lamp vessel (1), a core (3) of magnetic material, a first winding (7) arranged to surround the core and connected to a high-frequency supply unit (4), one of the lead-in wires of this winding being electrically connected to a lead-in wire of a se ...


4
Henk Houkes: DC-AC converter for igniting and supplying a discharge lamp. U S Philips Corporation, David R Treacy, Bernard Franzblau, May 31, 1988: US04748383 (24 worldwide citation)

A DC-AC converter for igniting and supplying a low-pressure discharge lamp, e.g. an electrodeless low-pressure gas discharge lamp. The converter has two input terminals (9, 10) for connection to a d.c. voltage source. The input terminals are connected to a series arrangement controlled semiconductor ...


5
Franciscus H T Lammers, Henk Houkes, Paul R Veldman: High frequency ballast for a gas discharge lamp. U S Philips Corporation, Bernard Franzblau, June 19, 1990: US04935672 (18 worldwide citation)

A DC-AC converter for igniting and supplying a gas discharge lamp (1). The converter has two input terminals (C, D) to be connected to a DC voltage source. The input terminals are interconnected by means of a series arrangement that includes a load circuit comprising at least the lamp (1) and an ind ...


6
Henk Houkes: Frequency converter for supplying an electrodeless discharge lamp. U S Philips Corporation, Robert T Mayer, Bernard Franzblau, November 15, 1983: US04415838 (12 worldwide citation)

A frequency converter for supplying an electrodeless discharge lamp comprises a VMOS controlled semiconductor switching element and a parallel circuit including an electric coil coupled to a discharge path of the lamp. A control circuit of the switching element includes a transformer which, in combi ...


7
Henk Houkes: Circuit arrangement comprising a high-voltage power transistor. U S Philips Corporation, Thomas A Briody, William J Streeter, Edward W Goodman, October 7, 1980: US04227099 (7 worldwide citation)

A Darlington pair having a high-voltage power transistor for a line deflection circuit and/or a switched-mode power supply. The drive circuit comprises two current paths, namely a switch-on path coupled to the base electrode of the high-voltage power transistor and which comprises a switched-mode cu ...


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