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US 5,291,082 AGranted
Low loss power switch
AssigneeCrouzet Automatismes
InventorsGeorges Revillet, Philippe Berge
Life of this patent
Estimating the term…
Abstract
A power switch comprising: at least one bipolar transistor (T1), the base of which is controlled through an amplifier 12 by a control signal (VC) and a sensor (10) of the current (I) flowing through the switch; at least one insulated gate bipolar transistor (IGBT) (T2) connected in parallel to said at least one bipolar transistor (T1), the gate of which is controlled by said control signal (VC); and means (S) for inhibiting the base control of said at least one bipolar transistor (T1) when the current flowing through the switch is lower than a predetermined value (I.sub.0).
Claims6
A power switch comprising:
- at least one bipolar transistor (T1), the collector and emitter of which define two ends of a power switch, the base of which is controlled through an amplifier (12) and an inhibiting means (S) by a control signal (VC);
- and a sensor (10) connected to one end of the switch for sensing current (I) flowing through the switch;
- and
- at least one insulated gate bipolar transistor (IGBT) (T2) connected in parallel to said at least one bipolar transistor (T1), the gate of which is controlled by said control signal (VC);
- wherein said inhibiting means (S) is controlled by said sensor for inhibiting the base control of said at least one bipolar transistor (T1) when the current flowing through the switch is lower than a predetermined value (I0) of the sensor.
2 more elements
Dependencies are inferred from the claim text.