Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Silicon controlled rectifier ignition
Patent
1996-04-26
2000-04-18
Vu, David H.
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Silicon controlled rectifier ignition
315224, 327512, 361103, H05B 3700, H03K 1756
Patent
active
060519339
ABSTRACT:
A monolithically integrated power device for driving electrical loads includes a power stage having a high-voltage bipolar transistor and a low-voltage auxiliary transistor cascade-connected and inserted between a first power supply terminal and a second power supply terminal of the device. The power device also includes a driver circuit for the power stage having an input connected to an input terminal of the device. In accordance with the present invention the device includes a circuit for protection thereof against an excessive temperature rise and controlling power down of the power stage. It includes specifically a temperature sensing circuit which generates a signal dependent on the temperature present in the device, a comparator circuit which receives this signal and compares it with a reference voltage and at least a first switch circuit generating an interdiction signal when the temperature in the device exceeds a preset maximum value and which is interlocked with an output of the comparator circuit and connected functionally through its output to the power stage. The device is advantageously usable in a fluorescent lamp driving circuit, that is to say in the so-called "lamp ballast".
REFERENCES:
patent: 4677346 (1987-06-01), Roberts et al.
patent: 4692688 (1987-09-01), Stanojevic
patent: 4866350 (1989-09-01), Counts
patent: 4971921 (1990-11-01), Fukunaga et al.
patent: 5315214 (1994-05-01), Lesea
patent: 5424897 (1995-06-01), Mietus et al.
European Search Report from European Patent Application 95830167.3, filed Apr. 28, 1995.
Aiello Natale
La Barbera Atanasio
Palara Sergio
Consorzio per la Ricerca sulla Microelettronica nel Mezzogiorno
Galanthay Theodore E.
Morris James H.
SGS--Thomson Microelectronics S.r.l.
Vu David H.
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