High frequency inductive lamp and power oscillator

• US 6,949,887 B2
• Filed: 10/12/2001
• Issued: 09/27/2005
• Est. Priority Date: 01/13/1998
• Status: Expired due to Fees

• Current Assignee: Fusion Lighting, Inc.
• Original Assignee: Intel Corporation
• Inventors: Kirkpatrick, Douglas A., Gitsevich, Aleksandr
• Primary Examiner(s): Wong, Don
• Assistant Examiner(s): VU, JIMMY T
• Application Number:
  US09/975,552
• Publication Number:
  US 20020167282A1
• Time in Patent Office: 1,446 Days
• Field of Search: 315/5, 315/246, 315/247, 315/248, 315/291, 315/307, 315/224, 315/219, 363/124
• US Class Current: 315/248
• CPC Class Codes: H01J 61/025 Associated optical elements
• CPC Class Codes: H01J 61/12 Selection of substances for gas fillings; Specified operating pressure or temperature
• CPC Class Codes: H01J 61/125 having an halogenide as principal component
• CPC Class Codes: H01J 61/52 Cooling arrangements; Heating arrangements; Means for circulating gas or vapour within the discharge space heating or cooling arrangements to promote ionisation for starting H01J61/54
• CPC Class Codes: H01J 61/523 Heating or cooling particular parts of the lamp
• CPC Class Codes: H01J 65/044 the field being produced by a separate microwave unit
• CPC Class Codes: H01J 65/048 the field being produced by using an excitation coil
• CPC Class Codes: H05B 41/24 in which the lamp is fed by high frequency ac, or with separate oscillator frequencyH05B41/26 takes precedence
• CPC Class Codes: Y02B 20/00 Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

Abstract

An oscillator includes an amplifier having an input and an output, a feedback network connected between the input of the amplifier and the output of the amplifier, the feedback network being configured to provide suitable positive feedback from the output of the amplifier to the input of the amplifier to initiate and sustain an oscillating condition, and a tuning circuit connected to the input of the amplifier, wherein the tuning circuit is continuously variable and consists of solid state electrical components with no mechanically adjustable devices including a pair of diodes connected to each other at their respective cathodes with a control voltage connected at the junction of the diodes. Another oscillator includes an amplifier having an input and an output, a feedback network connected between the input of the amplifier and the output of the amplifier, the feedback network being configured to provide suitable positive feedback from the output of the amplifier to the input of the amplifier to initiate and sustain an oscillating condition, and transmission lines connected to the input of the amplifier with an input pad and a perpendicular transmission line extending from the input pad and forming a leg of a resonant “T”, and wherein the feedback network is coupled to the leg of the resonant “T”.

Claims

1. An oscillator, comprising:

an amplifier having an input and an output;

a feedback network connected between the input of the amplifier and the output of the amplifier, the feedback network being configured to provide suitable positive feedback from the output of the amplifier to the input of the amplifier to initiate and sustain an oscillating condition; and

a tuning circuit connected to the input of the amplifier, wherein the tuning circuit is continuously variable and consists of solid state electrical components with no mechanically adjustable devices including a pair of diodes connected to each other at their respective cathodes with a control voltage connected at the junction of the diodes.

2. An oscillator, comprising:

an amplifier having an input and an output;

a feedback network connected between the input of the amplifier and the output of the amplifier, the feedback network being configured to provide suitable positive feedback from the output of the amplifier to the input of the amplifier to initiate and sustain an oscillating condition; and

transmission lines connected to the input of the amplifier with an input pad and a perpendicular transmission line extending from the input pad and forming a leg of a resonant “

T”

, and wherein the feedback network is coupled to the leg of the resonant “

T”

.