Power failure protector circuit
US4530027A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 30, 1984 |
| Grant date | Jul 16, 1985 |
| Priority date | — |
| Expiry date | Mar 30, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H3/243
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A power failure protector circuit prevents spurious output signals from an electronic circuit when power to the electronic circuit is interrupted. The output of the electronic circuit is effectively blocked by a switch. The switch is turned off when the power supply is turned on and remains off until the power supply is interrupted. A capacitor is normally charged to the operating voltage of the power supply and when the power supply is interrupted, the capacitor discharges to turn the switch on during the interval when the operating voltages of the electronic circuit are decaying. The capacitor also provides a power source to maintain the operating voltages of the electronic circuit near normal for a short interval after the power supply is interrupted thus insuring correct operation of the electronic circuit until after the switch is turned on and the output from the circuit is blocked.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.