H - Electricity – 02 – H
Patent
H - Electricity
02
H
H02H 7/12 (2006.01) H05B 37/00 (2006.01) H05B 41/14 (2006.01) H02M 1/00 (2006.01)
Patent
CA 2538210
A circuit arrangement for protecting an electronic converter against overloads includes: - a low impedance path (R7, T1) selectively activatable to prevent ignition of the electronic converter, the low impedance path (R7, T1) including an electronic switch (T1), - a control capacitor (C2) whose charge voltage controls the electronic switch (T1), whereby the electronic switch (T1) is activated to prevent ignition of the electronic converter when the charge voltage of the control capacitor (C2) is above a given threshold, - a first generator (V+) for loading the control capacitor (C2), the first generator (V+) activatable in the presence of a first overload condition of the electronic converter, and - a second generator (V-) for further loading the control capacitor (C2), the second generator (V-) activatable in the presence of a second overload condition of the electronic converter, the second overload condition being heavier than the first overload condition. The first generator (V+) and the second generator (V-) are configured for charging the control capacitor (C2) as long as said electronic converter is ignited. As a consequence, in the case of the second overload condition, the charge voltage (Vc2) of the control capacitor (C2) reaches a higher level: the charge voltage (Vc2) of the control capacitor (C2) thus keeps the electronic switch (T1) activated to prevent ignition of the electronic converter for a longer time than in the case of the first overload condition.
Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh
Smart & Biggar
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