US 11,310,883 B2Granted

Electrolytic capacitorless, selectively dimmable LED driver

AssigneeThe Research Foundation for The State University of New York

InventorPritam Das

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Abstract

An apparatus method for driving light emitting diodes (LEDs), comprising: receiving an alternating current input; producing a DC current having a voltage with an AC-DC boost power-factor correction stage, having a variable-frequency operation, and a set of switches controlled in dependence on the voltage to limit a peak LED current; and producing an LED drive current with a DC-DC power conversion stage having a set of switches to selectively pulse-width modulate the LEDs to control a brightness, wherein the set of switches in the AC-DC boost power-factor correction stage and the set of switches in the DC-DC power conversion stage are each controlled to switch at zero current.

Claims20

Dependent claims

An electronic driver circuit, comprising:

an input configured to receive an alternating current input;
an AC-DC boost stage, having a first set of switches, the AC-DC boost stage producing a load-dependent instantaneous ripple voltage;
a DC-DC power conversion stage, having a second set of switches;
a coupling device configured to transfer power from the AC-DC boost stage to the DC-DC power conversion stage;
and
a controller configured to control:
the first set of switches in the AC-DC boost stage, to transfer power to the DC-DC power conversion stage, while limiting a peak current, and
the second set of switches in the DC-DC power conversion stage, to selectively pulse-width modulate an average current, a pulse width modulation frequency of the DC-DC power conversion stage being dependent on the load and the instantaneous ripple voltage,
wherein the first set of switches in the AC-DC boost stage and the second set of switches in the DC-DC power conversion stage are each controlled to switch at zero voltage;
and
an output configured to supply the pulse width modulated current.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/321,057Filed 14 May 2021 · continuation
Priority: 20 May 2019
Published: US 2021/0274617 A12 Sep 2021
Granted: 19 Apr 2022
Term ends: Not estimatedThe source records don’t support an estimate.

Classification15 codes

H02M 1/14
Details of apparatus for conversion: arrangements for reducing ripples from DC input or output
H02M 1/083
Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters: for the ignition at…
H02M 3/33569
Using semiconductor devices only: having several active switching elements
H02M 3/33571
Having several active switching elements: half-bridge at primary side of an isolation transformer

Family

Application62/850,071Us provisional application · filed 20 May 2019
Application16/875,821Parent of this continuation · filed 15 May 2020
US 11,013,083 B2Parent of this continuation · filed 18 May 2021
US 2021/0274617 A1Pre-grant publication · published 2 Sep 2021
US 2020/0375002 A1Published application
US 11,310,883 B2This patent

From the US filing history. Foreign family members aren’t listed.

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