Light emitting unit driving circuit and light emitting device
AssigneeOSRAM GmbH
InventorsHaixiang He, Wanchun Jiang, Martin Brueckel, Hu Wang
Life of this patent
Estimating the term…
Abstract
A light emitting unit driving circuit may include: an operating voltage supplying unit configured to supply a voltage input for the driving circuit; a driving unit coupled to the operating voltage supplying unit and configured to drive the light emitting unit to make the light emitting unit turn on or turn off; and a feedback control unit coupled between the driving unit and the light emitting unit, and configured to form a feedback loop together with the driving circuit and the light emitting unit to stabilize an operating current of the light emitting unit.
Claims9
A driving circuit for driving a light emitting unit to operate, the driving circuit comprising:
- an operating voltage supplying unit configured to supply a voltage input for the driving circuit;
- a driving unit coupled to the operating voltage supplying unit and configured to drive the light emitting unit to make the light emitting unit turn on or turn off;
- and
- a feedback control unit coupled between the driving unit and the light emitting unit, and configured to form a feedback loop together with the driving circuit and the light emitting unit to stabilize an operating current of the light emitting unit;
- wherein the driving unit comprises a switch unit and a soft switching on/off setting unit successively coupled in series between the operating voltage supplying unit and the driving unit,
- wherein the switch unit controls the soft switching on/off setting unit to operate in a soft switching on setting state or a soft switching off setting state so as to control soft switching on or off of the light emitting unit;
- and
- wherein the driving unit is configured to comprise a first transistor, a base thereof being connected to a positive input terminal of the operating voltage supplying unit, an emitter thereof being connected to the light emitting unit, and a base thereof being connected to a first setting terminal of the soft switching on/off setting unit via a first base resistor.
A light emitting device, comprising:
- at least one light emitting unit;
- and
- a driving circuit for driving the at least one light emitting unit to operate, the driving circuit comprising:
- an operating voltage supplying unit configured to supply a voltage input for the driving circuit;
- a driving unit coupled to the operating voltage supplying unit and configured to drive the light emitting unit to make the light emitting unit turn on or turn off;
- and
- a feedback control unit coupled between the driving unit and the light emitting unit, and configured to form a feedback loop together with the driving circuit and the light emitting unit to stabilize an operating current of the light emitting unit;
- wherein the driving unit comprises a switch unit and a soft switching on/off setting unit successively coupled in series between the operating voltage supplying unit and the driving unit,
- wherein the switch unit controls the soft switching on/off setting unit to operate in a soft switching on setting state or a soft switching off setting state so as to control soft switching on or off of the light emitting unit;
- and
- wherein the driving unit is configured to comprise a first transistor, a base thereof being connected to a positive input terminal of the operating voltage supplying unit, an emitter thereof being connected to the light emitting unit, and a base thereof being connected to a first setting terminal of the soft switching on/off setting unit via a first base resistor.
Dependencies are inferred from the claim text.