EP0048977A2
Expired / Lapsed
EP
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Discharge lamp operating apparatus
Assignee: Toshiba Electric Equipment Corp
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Filing: 1981-09-25
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Granted: —
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Expires: 2001-09-25
Abstract
Abstract An inverter (6) generates a high frequency output having a pulsating envelope, and its output circuit includes two resonant circuits (20, 21), which are set such that their respective resonant frequencies (f1, f2) are made substantially equal and constant irrespective of the impedance of a high pressure discharge lamp (17).
Inventors
- 👤 Yasunobu Koshimura
- 👤 Nanjou Aoike
- 👤 Hisao Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 21:51
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/53; H02M7/537; H02M7/5383; H02M7/53832; H02M7/53835; H05; H05B; H05B41/00; H05B41/14; H05B41/26; H05B41/28; H05B41/288; H05B41/292; H05B41/2928; Y; Y02; Y02B; Y02B70/00; Y02B70/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
113 words
A discharge lamp operating apparatus comprising a high frequency generator (6) for generating a high frequency output having a pulsating envelope, and a discharge lamp (17) energized by said high frequency output, said high frequency generator (6) including a first and a second resonant circuit (20, 21) respectively having a first and a second resonant frequency (f l , f 2 ) corresponding to the maximum and minimum of the internal impedance of said discharge lamp (17) respectively, said first and second resonant frequencies (f l , f 2 ) being set within a stable operation frequency range which is between two adjacent acoustical resonance frequency ranges peculiar to said discharge lamp (17).
Claim 2
Dependent Claim
113 words
A discharge lamp operating apparatus comprising a high frequency generator (6) for generating a high frequency output having a pulsating envelope, and a discharge lamp (17) energized by said high frequency output, said high frequency generator (6) including a first and a second resonant circuit (20, 21) respectively having a first and a second resonant frequency (f l , f 2 ) corresponding to the maximum and minimum of the internal impedance of said discharge lamp (17) respectively, said first and second resonant frequencies (f l , f 2 ) being set within a stable operation frequency range which is between two adjacent acoustical resonance frequency ranges peculiar to said discharge lamp (17).
Claim 3
Dependent Claim
26 words
The discharge lamp operating apparatus according to claim 1, wherein said first and second resonant frequencies (f l , f 2 ) are set substantially equal.
Claim 4
Dependent Claim
35 words
The discharge lamp operating apparatus according to claim 1, wherein said discharge lamp (17) is a high pressure discharge lamp such as a high pressure sodium lamp, a mercury lamp and a metal halide lamp.
Claim 5
Dependent Claim
30 words
The discharge lamp operating apparatus according to claim 1, wherein said high frequency generator (6) is a push-pull transistor inverter including pair transistors (7, 8) and an output transformer (9).
Claim 6
Dependent Claim
43 words
The discharge lamp operating apparatus according to claim 4, wherein said output transformer (9) is a leakage transformer (9a) having a secondary winding (9a2) connected in series with a capacitor (16) and the discharge lamp (17) to form a first resonant circuit (20b).
Claim 7
Dependent Claim
49 words
The discharge lamp operating apparatus according to claim 1, wherein said first resonant circuit (20) includes the main winding (91) of said output transformer (9) and a capacitor (16), and said second resonant circuit (21) includes the main winding (91) of said output transformer (9) and a capacitor (12).
Claim 8
Dependent Claim
33 words
The discharge lamp operating apparatus according to claim 6, wherein said first resonant circuit (20) further comprises a further capacitor (40) connected across two intermediate taps (91c, 91d) of the main winding (91).
Claim 9
Dependent Claim
47 words
The discharge lamp operating apparatus according to claim 1, wherein said high frequency generator (6) is energized by a direct current voltage consisting of a pulsating voltage from a full-wave rectifier (2) and a direct current voltage obtained across a capacitor (3) superimposed upon said pulsating voltage.
Claim 10
Dependent Claim
85 words
The discharge lamp operating apparatus according to claim 1, wherein said high frequency generator (6) is energized by a direct current voltage consisting of a pulsating voltage obtained from a full-wave rectifier (2) and an auxiliary DC voltage generating circuit constituted with a transformer (30) with a primary winding connected across an AC power source (1), an auxiliary full-wave rectifier (31) for rectifying the output of the transformer (30), and a condenser (32) connected across the DC output terminals of the auxiliary full-wave rectifier (31).
References Cited (Backward Citations)
No citation records indexed.
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