Silicon controlled rectifier trigger circuit
US4333019A · kind A · utility
Inventor
Key dates
| Filing date | May 7, 1980 |
| Grant date | Jun 1, 1982 |
| Priority date | — |
| Expiry date | May 7, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/725
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A silicon controlled rectifier trigger circuit is responsive to an input AC voltage and provides at least one drive pulse per switch activation to a load circuit. Such load circuit advantageously includes an electric stapler or an electric brad driver. Such trigger circuit generally comprises: a two-position switch; first and second capacitors; first and second Zener diodes; a transistor; and a silicon controlled rectifier. The drive pulse is provided to the load circuit when the switch is in its second position; the first capacitor is charged by the input AC voltage when the switch is in its first position; the first Zener diode and the transistor are conductive when the input AC voltage is greater than a first predetermined value; the first and second Zener diodes are conductive and the transistor is non-conductive when the input AC voltage is greater than a second predetermined value; the second capacitor is interposed between the first Zener diode and the transistor; the silicon controlled rectifier is conductive when the transistor is conductive and when the switch is in its second position to provide the drive pulse to the load circuit. According to specific embodiments of th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.