Performance and isolation improvements for digitally controlled AC attenuation and protection circuits
US9178352B2 · kind B2 · utility
1Cited by
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20Claims
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Key dates
| Filing date | Oct 20, 2014 |
| Grant date | Nov 3, 2015 |
| Priority date | — |
| Expiry date | Oct 20, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2217/0054
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A protection and attenuation circuit for sensitive AC loads is described. The circuit provides AC power protection and attenuation utilizing high-efficiency switch-mode techniques to attenuate an AC power signal by incorporating a bidirectional, transistorized switch driven from a pulse width modulation signal, PWM. The circuit monitors characteristics of the AC power signal driving a known load and characteristics of the load or other elements and determines the duty cycle of the pulse width modulated signal, PWM, based upon the duration and amplitude of the over-voltage, over-current, over-limit or other event.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.