Circuit for driving a load and for producing a signal indicative

Details Circuit for driving a load and for producing a signal indicative Circuit for driving a load and for producing a signal indicative

1990-11-05

1992-06-23

Wong, Peter S.

Electricity: power supply or regulation systems

Output level responsive

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

323285, 323908, 340458, G05F 1573

Patent

active

051246163

ABSTRACT:
A drive circuit for driving a capacitive load (4) and for producing a signal (FIG. 2b, 3b, 4b, 5b) indicative of the condition of the load, the circuit comprising: a FET (26) applying current to the load; a resistance (30) sensing the level of the applied current; a differential amplifier (32) detecting when the sensed level exceeds a predetermined threshold; and a bipolar transistor producing a control signal (FIG. 2b, 3b, 4b, 5b) to limit the applied current until the load current falls below the threshold, whereby the control signal is a pulse width modulated signal whose pulse width is indicative of the condition of the load.

REFERENCES:
patent: 4575673 (1986-03-01), Tedeschi et al.
patent: 4584555 (1986-04-01), Domorazek
patent: 4841219 (1989-06-01), Lonergan
patent: 4849683 (1989-07-01), Flolid

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