H - Electricity – 05 – B
Patent
H - Electricity
05
B
H05B 41/26 (2006.01) H02M 3/158 (2006.01) H05B 41/288 (2006.01) H05B 41/38 (2006.01) H02M 7/48 (2006.01)
Patent
CA 2170827
To increase the operating efficiency of an operating circuit for a high-pressure discharge lamp (LP), current is supplied to the discharge lamp in discontinuous mode, that is, in pulses which start from a zero or null current level when the lamp is operating in normal state. Current flow through a choke coil (LD), which alternately stores and releases energy, is sensed, and a new energy pulse is supplied only when the current through the choke coil has decayed to zero or null, by controlling a pulse width modulation circuit (P2) which, in turn, controls a transistor (T2) which, in turn controls current flow through the coil (LD). The transistor (T2) is a field effect transistor which has its source terminal connected to the negative terminal of an intermediate coupling capacitor (C1) forming part of the power supply for the lamp. A free wheeling diode (D1) is provided, connected to the positive terminal of the intermediate circuit capacitor (C1). After energization, and ignition of the lamp, the lamp is operated in continuous mode, with continuous current flow, to shorten the run-on or warm-up period thereof, switch-over to the discontinued mode operation being gradual as voltage and current supplied to the lamp reach normal operating state.
Bernitz Franz
Haederle Markus
Hansmann Frank
Osterried Josef
Fetherstonhaugh & Co.
Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh
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