Circuit for switching current in a mainly inductive load
AssigneeU.S. Philips Corporation
InventorPatrick LeClerc
Life of this patent
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Abstract
An "H" type amplifier circuit uses at least two current mirrors for alternately feeding current into the load in one direction and the other direction. In order to accelerate the turn-on of the current mirrors, a capacitance is associated with each of the two current mirrors. Each capacitance is alternately coupled in parallel with the input of its associated current mirror when this current mirror delivers current, and is coupled to the supply voltage terminals when this current mirror delivers no current. The operation is effected by means of a set of switches.
Claims18
A circuit for switching a current in a toad, comprising at least two current mirrors each having an input and an output, which current mirrors are arranged to drive the load between two terminals of a power supply alternately in one direction or in the other direction via the output of one or the other of the current mirrors, which are each actuated alternately by means of a control current fed into the respective input, characterized in that each of the current mirrors has, associated with it, a capacitor and a set of switching devices, which are connected and actuated so as to couple the capacitor:
- in parallel with the input of its associated current mirror when this current mirror, receiving the control current, delivers current, and
- in between the power supply terminals when this current mirror does not deliver current.
Dependencies are inferred from the claim text.