Method and apparatus for protecting a solenoid and its driving circuit in an electronic device
US7233478B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 7, 2004 |
| Grant date | Jun 19, 2007 |
| Priority date | — |
| Expiry date | May 18, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F27/402
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A circuit for protecting a solenoid and/or receipt printer in an electronic device, such as a point-of-sale terminal, includes a resistance and a capacitance. The resistance is electrically coupled in parallel with the capacitance, and the parallel network of resistance and capacitance is coupled in series with the solenoid. An energizing signal is applied to the parallel network to energize the solenoid. A method of protecting a solenoid and/or receipt printer in the electronic device includes the steps of coupling a resistance electrically in parallel with a capacitance, coupling the parallel network electrically in series with the solenoid, and applying an energizing signal to the parallel network to energize the solenoid. The capacitance preferably includes two polarized electrolytic capacitors electrically coupled in a back-to-back series configuration with common polarities connected to each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.