Applicant
SIGNIFY HOLDING B.V.
Grantee
SIGNIFY HOLDING B.V.
Primary examiner
Wei (Victor) Chan
Application number
15525547
Kind
B2
Document number
10397998
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Driver Circuit and Method

10397998 - 15525547 - USPTO

Application Nov 09, 2015 - Publication Aug 27, 2019

Priya Ranjan Mishra Rakeshbabu Panguloori

Abstract

A driver circuit has a driver unit (50) which provides a current for the load (51) based on an input voltage (10) comprising first and second terminals (10a, 10b). The driver unit (50) comprises a linear driver which comprises a current regulating element (Q3) between the input and the load, said element having a controllable resistive characteristic. A compensation unit (52) in series with the driver unit (50) and the input voltage provides a compensating voltage. This is used to control the voltage across the driver unit in dependence on the input voltage and operating conditions of the load. The compensation unit (52) comprises a switch mode power converter and a second capacitor (C2) as an energy source of the switch mode power converter, with the current regulating element (Q3), the load (51) and the second capacitor (C2) in series connection between the first and second terminals (10a, 10b). In this way, the operating range of the driver unit can be reduced to reduce power loss on the driver unit, and the compensating voltage can also be used with an energy harvesting system to increase overall system efficiency.

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