Circuit for regulating current in an inductive load
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United States of America Patent
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Jul 31, 1990
Grant Date -
N/A
app pub date -
Nov 13, 1987
filing date -
Nov 26, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The circuit according to the invention comprises a hysteresis comparator 9 connected to a transistor 2 controlling the current flowing in an inductive load 1. The voltage taken across the terminals of a measurement resistor 3 is compared with a reference voltage established by a source 6. According to the invention, a feedback loop 10 establishes a proportional action of the transistor 2 on the current in the load 1 when the voltage at S exceeds a predetermined threshold. In this way an oscillation is obtained between two values on either side of a nominal value, these two values being associated with the thresholds of the hysteresis comparator. Application to the production of an integrated circuit for the control of the ignition coil of an internal combustion engine.
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