Robust gauge driving circuit with pulse modulated input

Details Robust gauge driving circuit with pulse modulated input Robust gauge driving circuit with pulse modulated input

1995-02-13

1997-12-16

Raevis, Robert

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With electromagnetic field

738663, G01P 348

Patent

active

056989741

ABSTRACT:
An input circuit for an automotive gauge driver receives a pulse width modulated or pulse frequency signal having a duty cycle representing a parameter to be displayed. A switching transistor controls an RC filter to develop an analog voltage proportional to the parameter. The input circuit biases the transistor to correctly respond to the input signal over a large range of supply voltage and where the ground potential differs from that of the source of the input signal. An output transistor means (or two) in series with a gauge coil (or two) is controlled by the analog voltage to provide coil current to effect linear gauge operation. Diodes in the input circuit limit the analog voltage range to end values which match the turn-on characteristics of the transistor means.

REFERENCES:
patent: 3832628 (1974-08-01), Pottebaum
patent: 4371834 (1983-02-01), Bezard et al.
patent: 4928060 (1990-05-01), Ito
patent: 5004976 (1991-04-01), Markow et al.
patent: 5309087 (1994-05-01), Markow et al.

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