# US 2014/0152195 A1 · Method for Overcoming Excessively High Temperature of Constant Current Driving Chip and LED Light Bar Driving Circuit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0152195 A1 - Document ID: US20140152195A1 - Status: Published application - Kind: A1 - Application number: 13/807,718 - Filed: 2012-11-25 - Published: 2014-06-05 - Earliest claimed: 2012-11-14 - Assignees: Shenzhen China Star Optoelectronics Technology Co., Ltd. - Applicants: Shenzhen China Star Optoelectronics Technology Co. Ltd. - Inventors: Hua Zhang; Fei Li - Web page: https://patentgrep.com/patent/US20140152195A1 ## CPC - H05B 45/10: Controlling the intensity of the light - H05B 45/46: having LEDs disposed in parallel lines - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL ## 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. ## Claims ### Claim 1 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. ### Claim 2 (depends on 1) The method for overcoming excessively high temperature of a constant current driving chip as claimed in claim 1, wherein each of the constant current driving chips integrates therein two field-effect transistors or two triodes. ### Claim 3 (depends on 2) The method for overcoming excessively high temperature of a constant current driving chip as claimed in claim 2, 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. ### Claim 4 (depends on 1) The method for overcoming excessively high temperature of a constant current driving chip as claimed in claim 1, wherein the resistances of the resistors are determined according to predetermined brightness of the LED light bars. ### Claim 5 An LED (light emitting diode) light bar driving circuit, comprising a power source, two LED light bars, a dual-channel constant current driving chip, two resistors, and a control source, each of the LED light bars comprising a positive terminal and a negative terminal, the constant current driving chip comprising a first input pin, a second input pin, a first output pin, a second output pin, and a control pin, the positive terminal and the negative terminal of one of the LED light bars being respectively connected to the power source and the first input pin of the constant current driving chip, the positive terminal and the negative terminal of another one of the LED light bars being respectively connected to the power source and the second input pin of the constant current driving chip, one of the resistors having an end connected to the first output pin of the constant current driving chip and an opposite end connected to a grounding line, another one of the resistors having an end connected to the second output pin of the constant current driving chip and an opposite end connected to the grounding line, the control pin being electrically connected to the control source. ### Claim 6 (depends on 5) The LED light bar driving circuit as claimed in claim 5, wherein each of the constant current driving chips integrates therein two field-effect transistors or two triodes. ### Claim 7 (depends on 6) The LED light bar driving circuit as claimed in claim 6, 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. ### Claim 8 (depends on 5) The LED light bar driving circuit as claimed in claim 5, wherein the resistances of the resistors are determined according to predetermined brightness of the LED light bars. ### Claim 9 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.