Lieyi Fang

Person

Shanghai, CN

People

Patents Grantslast 30 patents

Information Patent Grant
Systems and methods for power detection using at least a pulse-widt...
- Patent number 12,237,774
- Issue date Feb 25, 2025
- On-Bright Electronics (Shanghai) Co., Ltd.
- Penglin Yang
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Systems and methods of overvoltage protection for LED lighting
- Patent number 12,237,666
- Issue date Feb 25, 2025
- On-Bright Electronics (Shanghai) Co., Ltd.
- Zhuoyan Li
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Amplification systems and methods with one or more channels
- Patent number 12,218,632
- Issue date Feb 4, 2025
- On-Bright Electronics (Shanghai) Co., Ltd.
- Tingzhi Yuan
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Systems and methods for regulating LED currents
- Patent number 12,213,220
- Issue date Jan 28, 2025
- On-Bright Electronics (Shanghai) Co., Ltd.
- Jun Zhou
- H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Systems and methods for a controller for reducing power loss of pow...
- Patent number 12,057,764
- Issue date Aug 6, 2024
- On-Bright Electronics (Shanghai) Co., Ltd.
- Tuofu Liu
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Systems and methods for controlling gate voltage increase on primar...
- Patent number 12,047,007
- Issue date Jul 23, 2024
- On-Bright Electronics (Shanghai) Co., Ltd.
- Yuan Lin
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Systems and methods for low current detection
- Patent number 12,027,904
- Issue date Jul 2, 2024
- On-Bright Electronics (Shanghai) Co., Ltd.
- Qiang Luo
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Systems and methods for regulating LED currents
- Patent number 12,016,095
- Issue date Jun 18, 2024
- On-Bright Electronics (Shanghai) Co., Ltd.
- Jun Zhou
- H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Systems and methods for output current regulation in power conversi...
- Patent number 11,996,773
- Issue date May 28, 2024
- Guangzhou On-Bright Electronics Co., Ltd.
- Lieyi Fang
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Systems and methods for voltage compensation based on load conditio...
- Patent number 11,996,779
- Issue date May 28, 2024
- On-Bright Electronics (Shanghai) Co., Ltd.
- Wuping Lin
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Amplification systems and methods with distortion reductions
- Patent number 11,962,275
- Issue date Apr 16, 2024
- On-Bright Electronics (Shanghai) Co., Ltd.
- Tingzhi Yuan
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
LED lighting systems and methods for constant current control in va...
- Patent number 11,956,867
- Issue date Apr 9, 2024
- On-Bright Electronics (Shanghai) Co., Ltd.
- Lieyi Fang
- Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMA...
Information Patent Grant
Systems and methods for error amplification and processing
- Patent number 11,936,351
- Issue date Mar 19, 2024
- On-Bright Electronics (Shanghai) Co., Ltd.
- Yaozhang Chen
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Systems and methods for regulating power conversion systems with ou...
- Patent number 11,764,684
- Issue date Sep 19, 2023
- On-Bright Electronics (Shanghai) Co., Ltd.
- Yaming Cao
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Systems and methods for controlling synchronous rectification
- Patent number 11,764,697
- Issue date Sep 19, 2023
- On-Bright Electronics (Shanghai) Co., Ltd.
- Chunsheng Zhao
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Systems and methods for synchronous rectification of power supply s...
- Patent number 11,757,366
- Issue date Sep 12, 2023
- On-Bright Electronics (Shanghai) Co., Ltd.
- Yaming Cao
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Systems and methods for regulating LED currents
- Patent number 11,751,300
- Issue date Sep 5, 2023
- On-Bright Electronics (Shanghai) Co., Ltd.
- Jun Zhou
- H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Systems and methods for voltage compensation based on load conditio...
- Patent number 11,652,419
- Issue date May 16, 2023
- On-Bright Electronics (Shanghai) Co., Ltd.
- Wuping Lin
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Systems and methods for output current regulation in power conversi...
- Patent number 11,652,410
- Issue date May 16, 2023
- On-Bright Electronics (Shanghai) Co., Ltd.
- Qian Fang
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Systems and methods for output current regulation in power conversi...
- Patent number 11,626,797
- Issue date Apr 11, 2023
- Guangzhou ON-Bright Electronics Co., Ltd.
- Lieyi Fang
- G05 - CONTROLLING REGULATING
Information Patent Grant
Systems and methods for regulating power conversion systems with ou...
- Patent number 11,588,405
- Issue date Feb 21, 2023
- On-Bright Electronics (Shanghai) Co., Ltd.
- Yaming Cao
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Systems and methods for regulating power conversion systems with ou...
- Patent number 11,581,815
- Issue date Feb 14, 2023
- On-Bright Electronics (Shanghai) Co., Ltd.
- Yaming Cao
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Systems and methods for low current detection
- Patent number 11,563,335
- Issue date Jan 24, 2023
- On-Bright Electronics (Shanghai) Co., Ltd.
- Qiang Luo
- G01 - MEASURING TESTING
Information Patent Grant
Systems and methods for voltage compensation based on load conditio...
- Patent number 11,552,570
- Issue date Jan 10, 2023
- On-Bright Electronics (Shanghai) Co., Ltd.
- Wuping Lin
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Systems and methods for reducing power loss of power converters
- Patent number 11,532,983
- Issue date Dec 20, 2022
- On-Bright Electronics (Shanghai) Co., Ltd.
- Tuofu Liu
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Systems and methods for regulating LED currents
- Patent number 11,483,907
- Issue date Oct 25, 2022
- On-Bright Electronics (Shanghai) Co., Ltd.
- Jun Zhou
- H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
Information Patent Grant
System and method providing protection in the event of current sens...
- Patent number 11,356,025
- Issue date Jun 7, 2022
- On-Bright Electronics (Shanghai) Co., Ltd.
- Dongze Yang
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Systems and methods for current regulation in light-emitting-diode...
- Patent number 11,336,177
- Issue date May 17, 2022
- On-Bright Electronics (Shanghai) Co., Ltd.
- Meng Li
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
LED lighting systems and methods for constant current control in va...
- Patent number 11,317,482
- Issue date Apr 26, 2022
- On-Bright Electronics (Shanghai) Co., Ltd.
- Lieyi Fang
- Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMA...
Information Patent Grant
System and method providing over current protection based on duty c...
- Patent number 11,264,888
- Issue date Mar 1, 2022
- On-Bright Electronics (Shanghai) Co., Ltd.
- Chao Yao
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER

Patents Applicationslast 30 patents

Information Patent Application
CONSTANT-CURRENT SWITCH-MODE POWER CONVERTERS FOR LED LIGHTING AND...
- Publication number 20250024571
- Publication date Jan 16, 2025
- On-Bright Electronics (Shanghai) Co., Ltd.
- Liqiang Zhu
- H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
Information Patent Application
SYSTEMS AND METHODS FOR CONTROLLING GATE VOLTAGE INCREASE ON PRIMAR...
- Publication number 20240421714
- Publication date Dec 19, 2024
- On-Bright Electronics (Shanghai) Co., Ltd.
- YUAN LIN
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Application
SYSTEMS AND METHODS FOR ERROR AMPLIFICATION AND PROCESSING
- Publication number 20240250648
- Publication date Jul 25, 2024
- On-Bright Electronics (Shanghai) Co., Ltd.
- YAOZHANG CHEN
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Application
SYSTEMS AND METHODS FOR ERROR AMPLIFICATION AND PROCESSING
- Publication number 20240250649
- Publication date Jul 25, 2024
- On-Bright Electronics (Shanghai) Co., Ltd.
- YAOZHANG CHEN
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Application
SYSTEMS AND METHODS FOR CONTROLLING SYNCHRONOUS RECTIFICATION
- Publication number 20240072678
- Publication date Feb 29, 2024
- On-Bright Electronics (Shanghai) Co., Ltd.
- CHUNSHENG ZHAO
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Application
SYSTEMS AND METHODS FOR SYNCHRONOUS RECTIFICATION OF POWER SUPPLY S...
- Publication number 20240063724
- Publication date Feb 22, 2024
- On-Bright Electronics (Shanghai) Co., Ltd.
- YAMING CAO
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Application
SYSTEMS AND METHODS FOR REGULATING LED CURRENTS
- Publication number 20240057229
- Publication date Feb 15, 2024
- On-Bright Electronics (Shanghai) Co., Ltd.
- Jun Zhou
- Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMA...
Information Patent Application
SYSTEMS AND METHODS FOR DRIVING BIPOLAR TRANSISTORS RELATED TO POWE...
- Publication number 20240006999
- Publication date Jan 4, 2024
- ON-BRIGHT ELECTRONICS (SHANGHAI) CO, LTD.
- XIUHONG ZHANG
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Application
SYSTEMS AND METHODS FOR DRIVING BIPOLAR TRANSISTORS RELATED TO POWE...
- Publication number 20230369963
- Publication date Nov 16, 2023
- On-Bright Electronics (Shanghai) Co., Ltd.
- Xiuhong ZHANG
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Application
SYSTEMS AND METHODS FOR OUTPUT CURRENT REGULATION IN POWER CONVERSI...
- Publication number 20230336076
- Publication date Oct 19, 2023
- GUANGZHOU ON-BRIGHT ELECTRONICS CO., LTD.
- LIEYI FANG
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Application
CONTROLLERS AND METHODS FOR DETECTING AND ADJUSTING VOLTAGE DROPS R...
- Publication number 20230291315
- Publication date Sep 14, 2023
- On-Bright Electronics (Shanghai) Co., Ltd.
- PENGLIN YANG
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Application
SWITCH-MODE POWER CONVERTERS WITH CONTROL OF TURNING OFF TRANSISTOR...
- Publication number 20230283165
- Publication date Sep 7, 2023
- On-Bright Electronics (Shanghai) Co., Ltd.
- QIAN FANG
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Application
SYSTEMS AND METHODS FOR LOW CURRENT DETECTION
- Publication number 20230223780
- Publication date Jul 13, 2023
- On-Bright Electronics (Shanghai) Co., Ltd.
- Qiang Luo
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Application
SYSTEMS AND METHODS FOR REDUCING POWER LOSS OF POWER CONVERTERS
- Publication number 20230216403
- Publication date Jul 6, 2023
- On-Bright Electronics (Shanghai) Co., Ltd.
- Tuofu Liu
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Application
SYSTEMS AND METHODS FOR VOLTAGE COMPENSATION BASED ON LOAD CONDITIO...
- Publication number 20230216418
- Publication date Jul 6, 2023
- On-Bright Electronics (Shanghai) Co., Ltd.
- WUPING LIN
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Application
SYSTEMS AND METHODS FOR REGULATING LED CURRENTS
- Publication number 20230119958
- Publication date Apr 20, 2023
- On-Bright Electronics (Shanghai) Co., Ltd.
- Jun Zhou
- H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
Information Patent Application
SYSTEMS AND METHODS FOR POWER DETECTION
- Publication number 20230070846
- Publication date Mar 9, 2023
- On-Bright Electronics (Shanghai) Co., Ltd.
- PENGLIN YANG
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Application
SYSTEMS AND METHODS FOR CONTROLLING SYNCHRONOUS RECTIFIERS IN POWER...
- Publication number 20220329171
- Publication date Oct 13, 2022
- On-Bright Electronics (Shanghai) Co., Ltd.
- CHUNSHENG ZHAO
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Application
SYSTEMS AND METHODS FOR CONTROLLING GATE VOLTAGE INCREASE ON PRIMAR...
- Publication number 20220294355
- Publication date Sep 15, 2022
- On-Bright Electronics (Shanghai) Co., Ltd.
- YUAN LIN
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Application
SYSTEMS AND METHODS FOR VOLTAGE COMPENSATION BASED ON LOAD CONDITIO...
- Publication number 20220190729
- Publication date Jun 16, 2022
- On-Bright Electronics (Shanghai) Co., Ltd.
- WUPING LIN
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Application
AMPLIFICATION SYSTEMS AND METHODS WITH ONE OR MORE CHANNELS
- Publication number 20220190784
- Publication date Jun 16, 2022
- On-Bright Electronics (Shanghai) Co., Ltd.
- Tingzhi Yuan
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Application
SYSTEMS AND METHODS FOR VOLTAGE COMPENSATION BASED ON LOAD CONDITIO...
- Publication number 20220045616
- Publication date Feb 10, 2022
- On-Bright Electronics (Shanghai) Co., Ltd.
- WUPING LIN
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Application
LED LIGHTING SYSTEMS AND METHODS FOR CONSTANT CURRENT CONTROL IN VA...
- Publication number 20220039225
- Publication date Feb 3, 2022
- On-Bright Electronics (Shanghai) Co., Ltd.
- Lieyi Fang
- Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMA...
Information Patent Application
SYSTEMS AND METHODS FOR SYNCHRONOUS RECTIFICATION OF POWER SUPPLY S...
- Publication number 20210376746
- Publication date Dec 2, 2021
- On-Bright Electronics (Shanghai) Co., Ltd.
- YAMING CAO
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Application
SYSTEMS AND METHODS FOR REGULATING LED CURRENTS
- Publication number 20210282240
- Publication date Sep 9, 2021
- On-Bright Electronics (Shanghai) Co., Ltd.
- Jun Zhou
- Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMA...
Information Patent Application
SYSTEMS AND METHODS FOR LOW CURRENT DETECTION
- Publication number 20210226470
- Publication date Jul 22, 2021
- On-Bright Electronics (Shanghai) Co., Ltd.
- Qiang Luo
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Application
SYSTEMS AND METHODS FOR ERROR AMPLIFICATION AND PROCESSING
- Publication number 20210226596
- Publication date Jul 22, 2021
- On-Bright Electronics (Shanghai) Co., Ltd.
- YAOZHANG CHEN
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Application
SYSTEMS AND METHODS FOR CONTROLLING SYNCHRONOUS RECTIFICATION
- Publication number 20210226540
- Publication date Jul 22, 2021
- On-Bright Electronics (Shanghai) Co., Ltd.
- CHUNSHENG ZHAO
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Application
SYSTEMS AND METHODS OF OVERVOLTAGE PROTECTION FOR LED LIGHTING
- Publication number 20210104949
- Publication date Apr 8, 2021
- On-Bright Electronics (Shanghai) Co., Ltd.
- Zhuoyan Li
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Application
SYSTEMS AND METHODS FOR REGULATING LED CURRENTS
- Publication number 20210100081
- Publication date Apr 1, 2021
- On-Bright Electronics (Shanghai) Co., Ltd.
- Jun Zhou
- H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR

Person

Patents Grantslast 30 patents

Systems and methods for power detection using at least a pulse-widt...

Systems and methods of overvoltage protection for LED lighting

Amplification systems and methods with one or more channels

Systems and methods for regulating LED currents

Systems and methods for a controller for reducing power loss of pow...

Systems and methods for controlling gate voltage increase on primar...

Systems and methods for low current detection

Systems and methods for regulating LED currents

Systems and methods for output current regulation in power conversi...

Systems and methods for voltage compensation based on load conditio...

Amplification systems and methods with distortion reductions

LED lighting systems and methods for constant current control in va...

Systems and methods for error amplification and processing

Systems and methods for regulating power conversion systems with ou...

Systems and methods for controlling synchronous rectification

Systems and methods for synchronous rectification of power supply s...

Systems and methods for regulating LED currents

Systems and methods for voltage compensation based on load conditio...

Systems and methods for output current regulation in power conversi...

Systems and methods for output current regulation in power conversi...

Systems and methods for regulating power conversion systems with ou...

Systems and methods for regulating power conversion systems with ou...

Systems and methods for low current detection

Systems and methods for voltage compensation based on load conditio...

Systems and methods for reducing power loss of power converters

Systems and methods for regulating LED currents

System and method providing protection in the event of current sens...

Systems and methods for current regulation in light-emitting-diode...

LED lighting systems and methods for constant current control in va...

System and method providing over current protection based on duty c...

Patents Applicationslast 30 patents

CONSTANT-CURRENT SWITCH-MODE POWER CONVERTERS FOR LED LIGHTING AND...

SYSTEMS AND METHODS FOR CONTROLLING GATE VOLTAGE INCREASE ON PRIMAR...

SYSTEMS AND METHODS FOR ERROR AMPLIFICATION AND PROCESSING

SYSTEMS AND METHODS FOR ERROR AMPLIFICATION AND PROCESSING

SYSTEMS AND METHODS FOR CONTROLLING SYNCHRONOUS RECTIFICATION

SYSTEMS AND METHODS FOR SYNCHRONOUS RECTIFICATION OF POWER SUPPLY S...

SYSTEMS AND METHODS FOR REGULATING LED CURRENTS

SYSTEMS AND METHODS FOR DRIVING BIPOLAR TRANSISTORS RELATED TO POWE...

SYSTEMS AND METHODS FOR DRIVING BIPOLAR TRANSISTORS RELATED TO POWE...

SYSTEMS AND METHODS FOR OUTPUT CURRENT REGULATION IN POWER CONVERSI...

CONTROLLERS AND METHODS FOR DETECTING AND ADJUSTING VOLTAGE DROPS R...

SWITCH-MODE POWER CONVERTERS WITH CONTROL OF TURNING OFF TRANSISTOR...

SYSTEMS AND METHODS FOR LOW CURRENT DETECTION

SYSTEMS AND METHODS FOR REDUCING POWER LOSS OF POWER CONVERTERS

SYSTEMS AND METHODS FOR VOLTAGE COMPENSATION BASED ON LOAD CONDITIO...

SYSTEMS AND METHODS FOR REGULATING LED CURRENTS

SYSTEMS AND METHODS FOR POWER DETECTION

SYSTEMS AND METHODS FOR CONTROLLING SYNCHRONOUS RECTIFIERS IN POWER...

SYSTEMS AND METHODS FOR CONTROLLING GATE VOLTAGE INCREASE ON PRIMAR...

SYSTEMS AND METHODS FOR VOLTAGE COMPENSATION BASED ON LOAD CONDITIO...

AMPLIFICATION SYSTEMS AND METHODS WITH ONE OR MORE CHANNELS

SYSTEMS AND METHODS FOR VOLTAGE COMPENSATION BASED ON LOAD CONDITIO...

LED LIGHTING SYSTEMS AND METHODS FOR CONSTANT CURRENT CONTROL IN VA...

SYSTEMS AND METHODS FOR SYNCHRONOUS RECTIFICATION OF POWER SUPPLY S...

SYSTEMS AND METHODS FOR REGULATING LED CURRENTS

SYSTEMS AND METHODS FOR LOW CURRENT DETECTION

SYSTEMS AND METHODS FOR ERROR AMPLIFICATION AND PROCESSING

SYSTEMS AND METHODS FOR CONTROLLING SYNCHRONOUS RECTIFICATION

SYSTEMS AND METHODS OF OVERVOLTAGE PROTECTION FOR LED LIGHTING

SYSTEMS AND METHODS FOR REGULATING LED CURRENTS