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US 4,730,123 AGranted
Circuit for driving a capacitive load which provides low current consumption
AssigneeU.S. Philips Corporation
InventorsFritz A. Wegener, Manfred Albach
Life of this patent
Estimating the term…
Abstract
A circuit arrangement for driving a capcitive load comprises a control circuit (1), whose output is the collector of an output transistor (2). The collector is coupled through the gatesource path of a junction field effect transistor (5) and a resistor (6) connected parallel thereto to the capacitive load (8). The drain connection of the J-FET is connected to the supply voltage (Ub). The circuit permits rapid switching of the load while maintaining the current consumption relatively low.
Claims6
A circuit arrangement for operation of a capacitive load comprising:
- a control circuit including an output transistor having a collector connected to an output of the control circuit, a terminal for a source of supply voltage for the circuit arrangement, a junction field effect transistor having a drain, source and a gate, means coupling said output of the control circuit to said capacitive load via the gate-source path of said field effect transistor, a resistor connected in parallel with said gate-source path of the field effect transistor, means connecting the drain of the field effect transistor to said supply voltage terminal, and wherein the collector-emitter path of the output transistor is in parallel with the load so that the capacitive load will be discharged via said resistor and said output transistor when the output transistor is made to conduct.
Dependencies are inferred from the claim text.