US 2019/0246466 A1Published application

Led driving circuit and method for balancing efficiency and power factor

AssigneeChina Resources Powtech (Shanghai) Co., Ltd.

InventorsJUN LIU, QUANQING WU, SHENGSHENG LU, GUOCHENG LI

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Abstract

A LED driving circuit and method for balancing efficiency and a power factor. The circuit comprises a voltage input module, an LED load, a constant current control module and a current turn-off slope control module for adjusting the turn-off slope of the current flowing through the LED load, such that a compromise between efficiency and power factor is achieved. When an input voltage is higher than a setting voltage, the current flowing through the LED load is turned off, such that the power consumption is reduced; in addition, the efficiency and power factor are balanced by adjusting the turn-off slope of the current. According to the present invention, a compensation capacitor is used to control the average current in an alternating current period and to limit peak current, thereby implementing constant power output within a wide range of input voltage.

Claims9

Dependent claims

A LED driving circuit for balancing efficiency and a power factor, characterized in that the LED driving circuit for balancing efficiency and a power factor at least comprises:

a voltage input module, an LED load, a constant current control module and a current turn-off slope control module;
wherein
the voltage input module is configured to provide an input voltage;
the LED load is connected to an output terminal of the voltage input module and is powered by the voltage input module;
the constant current control module is connected to an output terminal of the LED load to perform constant current control to the LED load;
the current turn-off slope control module is connected to an input terminal or an output terminal of the LED load, and when the input voltage is higher than a set voltage,
the current turn-off slope control module outputs a turn-off signal to linearly turn off the current flowing through the LED load and realize a compromise between efficiency and a power factor by adjusting the turn-off slope of the current flowing through the LED load.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/755,014Filed 30 Dec 2016
Priority: CN 201610457436.222 Jun 2016
Published: 8 Aug 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

H05B 45/355
Driver circuits: power factor correction [PFC]; Reactive power compensation
H05B 45/00
Circuit arrangements for operating light-emitting diodes [led]
H05B 45/46
With an active control inside an LED matrix: having LEDs disposed in parallel lines
H05B 45/48
With an active control inside an LED matrix: having LEDs organised in strings and incorporating parallel shunting devices

Family

US 10,595,368 B2Related patent
US 2019/0246466 A1This patent

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

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