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US 6,147,457 AGranted
Incandescent lamp with continuous high-frequency oscillations
AssigneeU.S. Philips Corporation
InventorsKlaus Lohn, Ulrich Boke, Bernd Hofmann
Life of this patent
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Abstract
An incandescent lamp with a low voltage burner (BM) and integrated voltage conversion means (VCM) having switching elements (Q1, Q2) driven by a separate control circuit (CC) comprising an integrated circuit (IC). The voltage conversion means are suitable for operation at a high temperature and causes only limited amounts of EMI.
Claims13
An incandescent lamp, comprising:
- a base for connection into a lamp socket, said base comprising a pair of base terminals for receiving an AC supply voltage with frequency f,
- voltage conversion means comprising:
- rectifying means having:
- input terminals coupled to said pair of base terminals and
- output terminals,
- capacitive means coupled to the output terminals and equipped with a first series arrangement comprising two capacitors,
- switching means coupled to the first series arrangement for generating a first high frequency voltage out of the voltage present over the first series arrangement, and
- transformer means, coupled to the switching means and comprising a primary winding and a secondary winding, for transforming the first high frequency voltage into a second high frequency voltage,
- low voltage incandescent burner means coupled to the secondary winding, and
- envelope means, comprising at least one translucent part, said envelope means being fastened to the base and together with the base enclosing the voltage conversion means and the low voltage incandescent burner means,
- characterized in that
- the voltage conversion means further comprises a control circuit comprising an integrated circuit for generating a control signal for rendering the switching means alternately conducting and non-conducting substantially independent of the frequency f of the AC supply voltage.
9 more elements
Voltage conversion means suitable for use in an incandescent lamp comprising:
- a rectifier having:
- input terminals coupled to an AC supply voltage with frequency f and
- output terminals,
- a series arrangement of capacitors operably coupled to the output terminals of the rectifier,
- a switch arrangement, operably coupled to the series arrangement that is configured to generate a first high frequency voltage, and
- a transformer, operably coupled to the switch arrangement and the series arrangement, comprising:
- a primary winding that receives the first high frequency voltage, and
- a secondary winding, that provides a corresponding second high frequency voltage that powers the incandescent lamp, and
- a control circuit that generates a control signal for controlling the switch arrangement substantially independent of the frequency f of the AC supply voltage.
6 more elements
An adapter for supplying an incandescent lamp, said incandescent lamp being equipped with a low voltage incandescent burner means and a lamp base,
- the adapter being configured to receive power from an AC supply voltage source at a frequency f, and to provide therefrom a high frequency voltage to the incandescent lamp,
- the adapter comprising:
- a rectifier having
- input terminals coupled to the AC supply voltage and
- output terminals,
- a series arrangement comprising two capacitors operably coupled to the output terminals of the rectifier,
- a switch arrangement, operably coupled to the series arrangement that is configured to provide the high frequency voltage to the incandescent lamp via a transformer, and
- a control circuit that is configured to generate a control signal for rendering the switching means alternately conducting and non-conducting substantially independent of the frequency f of the AC supply voltage.
5 more elements
Dependencies are inferred from the claim text.