Active damping circuit
US10225908B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 25, 2016 |
| Grant date | Mar 5, 2019 |
| Priority date | — |
| Expiry date | Feb 25, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/3575
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An active damping circuit is disclosed, which includes a peak current limiter, a drain source voltage limiter, a turn-on driver, a resistor shunt circuit, and a peak current sensor. The peak current sensor detects a rising edge of an input voltage from a phase cut dimmer by detecting a higher peak current. This drives a collector voltage of a second transistor of the peak current limiter low, which lowers a gate voltage of a first transistor of the peak current sensor, and forces it into a linear operating region, so it functions as a damping resistor. When the peak current sensor detects a decreased peak current, such that the turn-on edge of the input voltage is passed, the second transistor turns off, and the turn-on driver turns the first transistor on, such that the active damping circuit is waiting for a next edge of the input voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.