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TWI457045B - Led device, led driving circuit and method - Google Patents

Led device, led driving circuit and method Download PDF

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Publication number
TWI457045B
TWI457045B TW100135367A TW100135367A TWI457045B TW I457045 B TWI457045 B TW I457045B TW 100135367 A TW100135367 A TW 100135367A TW 100135367 A TW100135367 A TW 100135367A TW I457045 B TWI457045 B TW I457045B
Authority
TW
Taiwan
Prior art keywords
pwm signal
frequency
duty cycle
output pwm
led driving
Prior art date
Application number
TW100135367A
Other languages
Chinese (zh)
Other versions
TW201311051A (en
Inventor
Hsing Chien Yang
Wen Hsin Cheng
Ying Hao Hsu
Lan Ting Hsu
Tsung Hau Chang
Original Assignee
Novatek Microelectronics Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Novatek Microelectronics Corp filed Critical Novatek Microelectronics Corp
Priority to US13/293,860 priority Critical patent/US8994277B2/en
Publication of TW201311051A publication Critical patent/TW201311051A/en
Priority to US14/058,951 priority patent/US9119249B2/en
Application granted granted Critical
Publication of TWI457045B publication Critical patent/TWI457045B/en

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  • Led Devices (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Claims (11)

一種發光二極體(LED)驅動電路，包括：一LED控制電路，用以在頻域上將一輸入脈寬調變(pulse width modulation，PWM)訊號往高頻方向平移以產生一輸出PWM訊號，該輸出PWM訊號之工作週期(duty cycle)實質上相同於該輸入PWM訊號之工作週期；以及一功率級(power stage)電路，用以依據該輸出PWM訊號輸出一LED驅動電流；其中該LED控制電路包括：一工作週期偵測電路，用以偵測該輸入PWM訊號之工作週期，該工作週期偵測電路包括：一RC電路；以及一類比數位轉換器，用以搭配該RC電路以得到該輸入PWM訊號之工作週期；以及一脈波產生電路，用以依據該輸入PWM訊號之工作週期與一預定頻率產生該輸出PWM訊號。 A light emitting diode (LED) driving circuit includes: an LED control circuit for shifting an input pulse width modulation (PWM) signal to a high frequency direction in the frequency domain to generate an output PWM signal The duty cycle of the output PWM signal is substantially the same as the duty cycle of the input PWM signal; and a power stage circuit for outputting an LED driving current according to the output PWM signal; wherein the LED The control circuit includes: a duty cycle detection circuit for detecting a duty cycle of the input PWM signal, the duty cycle detection circuit comprising: an RC circuit; and an analog-to-digital converter for matching the RC circuit to obtain a duty cycle of the input PWM signal; and a pulse wave generating circuit configured to generate the output PWM signal according to a duty cycle of the input PWM signal and a predetermined frequency. 如申請專利範圍第1項所述之LED驅動電路，其中該輸入PWM訊號在頻域由一原始頻率往該預定頻率平移而得到該輸出PWM訊號，該預定頻率高於該原始頻率。 The LED driving circuit of claim 1, wherein the input PWM signal is translated from the original frequency to the predetermined frequency in the frequency domain to obtain the output PWM signal, the predetermined frequency being higher than the original frequency. 如申請專利範圍第1項所述之LED驅動電路，其中該輸出PWM訊號之頻率高於20KHz。 The LED driving circuit of claim 1, wherein the frequency of the output PWM signal is higher than 20 kHz. 如申請專利範圍第1項所述之LED驅動電路，其中該輸出PWM訊號之頻率高於22KHz。 The LED driving circuit of claim 1, wherein the frequency of the output PWM signal is higher than 22 kHz. 如申請專利範圍第1項所述之LED驅動電路，其中該輸出PWM訊號之頻率高於25KHz。 The LED driving circuit of claim 1, wherein the frequency of the output PWM signal is higher than 25 kHz. 一種發光二極體(LED)裝置，包括：一至多串發光二極體；以及如申請專利範圍第1項所述之LED驅動電路，耦接至該一至多串發光二極體，並用以驅動該一至多串發光二極體。 A light-emitting diode (LED) device comprising: one or more strings of light-emitting diodes; and the LED driving circuit according to claim 1, coupled to the one or more strings of light-emitting diodes and used for driving The one or more strings of light emitting diodes. 一種LED驅動方法，包括：將一輸入PWM訊號往高頻方向平移以產生一輸出PWM訊號，該輸出PWM訊號之工作週期實質上相同於該輸入PWM訊號之工作週期，其中將該輸入PWM訊號往高頻方向平移以產生該輸出PWM訊號之步驟係包括：對輸入PWM訊號進行濾波以得到一類比訊號；轉換該類比訊號為一數位訊號，該數位訊號指示該輸入PWM訊號之工作週期；以及依據該輸入PWM訊號之工作週期與一預定頻率產生該輸出PWM訊號；以及依據該輸出PWM訊號輸出一LED驅動電流。 An LED driving method includes: translating an input PWM signal to a high frequency direction to generate an output PWM signal, wherein the output PWM signal has a duty cycle substantially the same as a duty cycle of the input PWM signal, wherein the input PWM signal is The step of translating the high frequency direction to generate the output PWM signal includes: filtering the input PWM signal to obtain a analog signal; converting the analog signal to a digital signal, the digital signal indicating a duty cycle of the input PWM signal; The duty cycle of the input PWM signal and the predetermined frequency generate the output PWM signal; and output an LED driving current according to the output PWM signal. 如申請專利範圍第7項所述之LED驅動方法，其中依據該輸入PWM訊號之工作週期與該預定頻率產生該輸出PWM訊號之步驟係包括：將該輸入PWM訊號在頻域由一原始頻率往該預定頻率平移而得到該輸出PWM訊號，該預定頻率高於該原始頻率。 The LED driving method of claim 7, wherein the step of generating the output PWM signal according to the duty cycle of the input PWM signal and the predetermined frequency comprises: the input PWM signal is in a frequency domain from an original frequency The predetermined frequency is translated to obtain the output PWM signal, the predetermined frequency being higher than the original frequency. 如申請專利範圍第7項所述之LED驅動方法，其中該輸出PWM訊號之頻率高於20KHz。 The LED driving method of claim 7, wherein the frequency of the output PWM signal is higher than 20 kHz. 如申請專利範圍第7項所述之LED驅動方法， 其中該輸出PWM訊號之頻率高於22KHz。 For example, the LED driving method described in claim 7 of the patent scope, The frequency of the output PWM signal is higher than 22KHz. 如申請專利範圍第7項所述之LED驅動方法，其中該輸出PWM訊號之頻率高於25KHz。 The LED driving method of claim 7, wherein the frequency of the output PWM signal is higher than 25 kHz.
TW100135367A 2011-08-30 2011-09-29 Led device, led driving circuit and method TWI457045B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US13/293,860 US8994277B2 (en) 2011-08-30 2011-11-10 LED device, LED driving circuit and method
US14/058,951 US9119249B2 (en) 2011-08-30 2013-10-21 LED device, LED driving circuit and method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US201161528793P 2011-08-30 2011-08-30

Publications (2)

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TW201311051A TW201311051A (en) 2013-03-01
TWI457045B true TWI457045B (en) 2014-10-11

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104575444B (en) * 2013-10-22 2017-11-03 神讯电脑(昆山)有限公司 Brightness controlling device and brightness control method
US11076464B2 (en) * 2019-09-06 2021-07-27 Novatek Microelectronics Corp. Control method and driving circuit for light emitting diode
CN110719017A (en) * 2019-09-12 2020-01-21 中车唐山机车车辆有限公司 Device and method for limiting junction temperature and reducing loss of traction converter switching device

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JP2010502166A (en) * 2006-08-28 2010-01-21 ティーアイアール テクノロジー エルピー PWM method and apparatus, and light source driven by them
TW201023148A (en) * 2008-12-08 2010-06-16 Chi Mei Optoelectronics Corp Driving circuit of backlight
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TW201117666A (en) * 2009-11-12 2011-05-16 Richtek Technology Corp Digital dimming device and digital dimming method

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CN101552548B (en) * 2008-12-15 2011-01-26 伊博电源（杭州）有限公司 Power supply control system
CN101449970B (en) * 2008-12-29 2013-01-16 天津大学 Bioelectric amplifier
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Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
JP2010502166A (en) * 2006-08-28 2010-01-21 ティーアイアール テクノロジー エルピー PWM method and apparatus, and light source driven by them
TW201023148A (en) * 2008-12-08 2010-06-16 Chi Mei Optoelectronics Corp Driving circuit of backlight
US20110032008A1 (en) * 2009-08-07 2011-02-10 Freescale Semiconductor, Inc. Pulse width modulation frequency conversion
TW201117666A (en) * 2009-11-12 2011-05-16 Richtek Technology Corp Digital dimming device and digital dimming method

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TW201311051A (en) 2013-03-01
CN102968957A (en) 2013-03-13

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