Fast response control circuit
US4928048A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 28, 1988 |
| Grant date | May 22, 1990 |
| Priority date | — |
| Expiry date | Mar 28, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B7/02
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A fast response control circuit for providing an output signal in miminum time after receiving an enabling input signal. The control circuit includes an amplifier which provides an output signal having a magnitude determined by a variable input signal when the enabling input signal indicates that an output signal is desired. A feedback network and the amplifier together define a control loop which has a characteristic response time. When the enable signal is absent, a bias control biases a reactive component in the control loop so as to minimize this response time. The circuit is adapted for use in a fluid mass flow controller to provide rapid response to an enabling input signal, particularly when a very low fluid flow rate is desired.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.