Inverter with overload current protection
AssigneeAsea Brown Boveri AG
InventorHorst Gruning
Life of this patent
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Abstract
In an inverter with overload current projection, a half-bridge is divided in module form into two quarter-bridge branches. Disposed in the latter are a gate turn-off semiconductor component (7, 8), a freewheeling diode (9, 10) situated opposite with respect to a center point and a blocking capacitor (11, 12) in parallel with freewheeling diode (9, 10) and turn-off semiconductor component (7, 8). A measuring resistor (R1, R2) and a current-limiting component (L1, L2) are provided between a load terminal (3) of the bridge circuit and the center points of the quarter-bridge branches. The load current can be determined in a transient-free manner with the measuring resistors.
Claims8
An inverter having overload current protection, in which at least two turn-off semiconductor components (7, 8) are provided between a positive and a negative supply line (1, 2) in the sense of a half-bridge circuit, comprising:
- a) the half-bridge circuit divided into first and second quarter-bridge branches in which at least one freewheeling diode (9, 10) is provided opposite the semiconductor component (7, 8) with respect to a center point,
- b) a current-limiting component (L1, L2) disposed in each case between a load terminal (3) and the center points, and
- c) current measuring means provided between the center point and the current limiting components (L1, L2) for measuring the current flowing from each center point to the load terminal (3) for the purpose of re-triggering protection and detecting a load short circuit.
Dependencies are inferred from the claim text.