Control method and circuit for valve device

Details Control method and circuit for valve device Control method and circuit for valve device

1998-07-02

2000-01-25

Lee, Kevin

Fluid handling

Processes

137486, 251 11, 60530, F16K 31126, G05D 706

Patent

active

060168242

ABSTRACT:
An analog voltage signal V.sub.A generated from a command signal generating device is converted to a PWM signal V.sub.B by a converter, and a drive transistor is ON/OFF controlled by the PWM signal V.sub.B, whereby a current is conducted to a heater. When the heater is heated, a fluid filling a chamber of the valve device is caused to expand, whereby a membrane approaches a nozzle and a flow amount of pressurized air introduced to the valve device is restricted. As a result, energy consumed by the drive transistor is reduced and energy efficiency is improved. Further, because the generated heat from the drive transistor is small, the fluid is not affected thereby and raised in temperature by the transistor heat, whereby the flow amount characteristics of the valve device can be controlled in a stable fashion.

REFERENCES:
patent: 3860169 (1975-01-01), Norman
patent: 4347976 (1982-09-01), Jakobsen
patent: 4475686 (1984-10-01), Huelle et al.
patent: 4821997 (1989-04-01), Zdeblick
patent: 4877051 (1989-10-01), Day
patent: 5190068 (1993-03-01), Philbin
patent: 5463876 (1995-11-01), Bessler et al.

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