Electric lamp and discharge devices: systems – With cathode or cathode heater supply circuit – Pulsating or a.c. supply to the cathode or heater circuit
Patent
1983-12-12
1986-07-29
Moore, David K.
Electric lamp and discharge devices: systems
With cathode or cathode heater supply circuit
Pulsating or a.c. supply to the cathode or heater circuit
315107, 315306, 315310, 315DIG5, 361106, H05B 4114
Patent
active
046032819
ABSTRACT:
A Varistor (which is a non-linear impedance means) is connected in series with the primary winding of a current-transformer; and this series-combination is connected across the fluorescent lamp to be started. Before the lamp starts, the voltage across it is limited in magnitude by the voltage-clamping effect of the Varistor; and the current then flowing through the Varistor is transformed by the current-transformer and applied by way of separate secondary windings to each of the lamp's cathodes for heating thereof. A special high-voltage tertiary winding on the current-transformer provides for lamp starting aid voltage.
Thus, the lamp may be gently and rapidly started in the Rapid-Start mode.
However, as soon as the lamp starts, the voltage across the lamp diminishes to a magnitude lower than that required for current to flow through the Varistor. Thus, as soon as the lamp has started, the power for heating the cathodes is removed; which thereby provides for the higher efficiency lamp operation normally associated with the Pre-Heat mode.
To prevent damage to the Varistor, which might occur if power is applied to a non-operative lamp, or while there is no lamp connected, a thermally responsive latching circuit breaker is thermally connected with the Varistor and arranged to disconnect power as soon as the temperature on the Varistor exceeds a pre-determined acceptable level.
The voltage-clamping characteristics of the Varistor are so chosen as to limit the lamp starting voltage to a magnitude suitable for effective lamp starting.
REFERENCES:
patent: 4017761 (1977-04-01), Woldring
patent: 4068281 (1978-01-01), Harnden, Jr.
patent: 4350929 (1982-09-01), Katoogi
patent: 4399391 (1983-08-01), Hammer et al.
DeLuca Vincent
Moore David K.
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