US 2014/0152195 A1Published application

Method for Overcoming Excessively High Temperature of Constant Current Driving Chip and LED Light Bar Driving Circuit

AssigneeShenzhen China Star Optoelectronics Technology Co., Ltd.

InventorsHua Zhang, Fei Li

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Abstract

The invention provides a method for overcoming excessively high temperature of a constant current driving chip and an LED light bar driving circuit. The method includes (1) providing dual-channel constant current driving chips, each including first and second input pins, first and second output pins, and a control pin; (2) providing LED light bars, resistors, a control source, and a power source; (3) connecting ends of one light bar to the power source and the first input pin, connecting ends of another light bar to the power source and the second input pin, connecting ends of one resistor to the first output pin and grounding, connecting ends of another resistor to the second output pin and grounding, and connecting the control source to the control pin; (4) repeating step (3) until the light bars are connected; and (5) activating the control source and the power source to drive the light bars.

Claims9

Dependent claims

A method for overcoming excessively high temperature of a constant current driving chip, comprising the following steps:

(1) providing a plurality of constant current driving chips, wherein the constant current driving chips are dual-channel constant current driving chips and each of the constant current driving chips comprises a first input pin, a second input pin, a first output pin, a second output pin, and a control pin;
(2) providing a control source, a power source, and a plurality of LED light bars and a plurality of resistors both having a number corresponding to that of the constant current driving chips, each of the LED light bars having a positive terminal and a negative terminal;
(3) respectively connecting the positive terminal and the negative terminal of one of the LED light bars to the power source and the first input pin of one of the constant current driving chips and respectively connecting the positive terminal and the negative terminal of another one of the LED light bars to the power source and the second input pin of the constant current driving chip, also connecting an end of one of the resistors to the first output pin of the constant current driving chip and an opposite end to a grounding line, and also connecting an end of another one of the resistors to the second output pin of the constant current driving chip and an opposite end to the grounding line, connecting the control source to the control pin;
(4) repeating Step 3, until a predetermined number of the LED light bars are connected;
and
(5) activating the control source and the power source so as to apply the control source to control the corresponding LED light bars to conduct on or cut off.

3 more elements

A method for overcoming excessively high temperature of a constant current driving chip, comprising the following steps:

(1) providing a plurality of constant current driving chips, wherein the constant current driving chips are dual-channel constant current driving chips and each of the constant current driving chips comprises a first input pin, a second input pin, a first output pin, a second output pin, and a control pin;
(2) providing a control source, a power source, and a plurality of LED light bars and a plurality of resistors both having a number corresponding to that of the constant current driving chips, each of the LED light bars having a positive terminal and a negative terminal;
(3) respectively connecting the positive terminal and the negative terminal of one of the LED light bars to the power source and the first input pin of one of the constant current driving chips and respectively connecting the positive terminal and the negative terminal of another one of the LED light bars to the power source and the second input pin of the constant current driving chip, also connecting an end of one of the resistors to the first output pin of the constant current driving chip and an opposite end to a grounding line, and also connecting an end of another one of the resistors to the second output pin of the constant current driving chip and an opposite end to the grounding line, connecting the control source to the control pin;
(4) repeating Step 3, until a predetermined number of the LED light bars are connected;
and
(5) activating the control source and the power source so as to apply the control source to control the corresponding LED light bars to conduct on or cut off;
wherein each of the constant current driving chips integrates therein two field-effect transistors or two triodes;
wherein the control source supplies a high level or a low level to control the field-effect transistors or the triodes contained in the constant current driving chips to conduct on or cut off, the high level being greater than voltage of the drain terminal when the field-effect transistor is conducted on and being also greater than a threshold voltage of the field-effect transistor;
and
wherein the resistances of the resistors are determined according to predetermined brightness of the LED light bars.

7 more elements

Dependencies are inferred from the claim text.