One-terminal type level control circuit
US4476426A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jun 3, 1982 |
| Grant date | Oct 9, 1984 |
| Priority date | — |
| Expiry date | Jun 3, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H9/046
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A constant-current source transistor, which exhibits a constant-current characteristic corresponding to the power source voltage of a sensor and is connected to an input signal terminal of an input circuit, such as a microprocessor. A first transistor is connected so that it may supply a current from the power source of the input circuit to the constant-current source transistor, and a second transistor is connected in parallel to the constant-current source transistor. When the signal level at the input signal terminal exceeds a predetermined value, the second transistor is turned ON to effect level control so the input signal level may not become excessively high and damage the input circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.