Current regulation circuit for inductive loads

Details Current regulation circuit for inductive loads Current regulation circuit for inductive loads

1991-02-05

1991-10-15

Beha, Jr., William H.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

323282, 323284, G05F 140

Patent

active

050577654

ABSTRACT:
An integrated circuit voltage chop circuit for regulating the current in an inductive load is of the type having a fixed off time. A current-sensing comparator produces a reset signal when the current through the driver exceeds a predetermined peak amplitude. A load driver transistor is turned on and off according to the state of a bistable memory elememt, e.g. a flip flop. An external capacitor and external series resistor are connected to the integrated circuit and they determine the driver off time. A voltage comparator having hysteresis produces a high output logic level when the capacitor charges to a predetermined voltage which sets the flip flop and begins to slowly discharge the capacitor. When the capacitor discharges to a lower predetermined voltage, the voltage comparator output goes to a low logic level turning on a shorting transistor that quickly discharges the capacitor completely. A logic gate with an output connected to the reset terminal of the flip flop resets the flip flop when both the output of the voltage comparator is in the low level and the output of the current-sensing comparator produces the reset signal. Thus during the period in which the capacitor is slowly discharging large transient current pulses due to charge storage in the load, i.e., in the recirculation diode and stray capacitance, are blocked from resetting the flip flop. The integrated circuit user may therefore adjust the blocking time by adjusting the external capacitor and then adjust the drive off time by adjusting the external resistor.

REFERENCES:
patent: 4215383 (1980-07-01), Boyd
patent: 4811188 (1989-03-01), Bees

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