Current-shunting alternating current light-emitting diode driving circuit
US8773027B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 13, 2012 |
| Grant date | Jul 8, 2014 |
| Priority date | — |
| Expiry date | Mar 12, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/56
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A current-shunting AC LED driving circuit has a rectification unit, an LED unit, a voltage-controlled transistor, a shunt resistor, a current detection unit and a steady current control unit. The LED unit and the rectification unit constitute a power loop and acquire a pulsed DC power through the rectification unit. The voltage-controlled transistor and the current detection unit are serially connected to the power loop. The steady current control unit acquires an average loop current through the current detection unit to control the voltage-controlled transistor so that the LED unit can stably emit light. The shunt resistor is parallelly connected to the voltage-controlled transistor to constitute a current-shunting path to shunt the loop current flowing through the voltage-controlled transistor so as to reduce the power withstood by the voltage-controlled transistor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.