WO2021103799A1 - Procédé et dispositif de modulation d'impulsions en largeur (mil) - Google Patents

Procédé et dispositif de modulation d'impulsions en largeur (mil) Download PDF

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Publication number
WO2021103799A1
WO2021103799A1 PCT/CN2020/117964 CN2020117964W WO2021103799A1 WO 2021103799 A1 WO2021103799 A1 WO 2021103799A1 CN 2020117964 W CN2020117964 W CN 2020117964W WO 2021103799 A1 WO2021103799 A1 WO 2021103799A1
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WO
WIPO (PCT)
Prior art keywords
pwm
gray scale
gray
frame rate
refresh period
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Application number
PCT/CN2020/117964
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English (en)
Chinese (zh)
Inventor
黄荣丰
陈志曼
陈运筹
Original Assignee
广州市雅江光电设备有限公司
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Application filed by 广州市雅江光电设备有限公司 filed Critical 广州市雅江光电设备有限公司
Publication of WO2021103799A1 publication Critical patent/WO2021103799A1/fr

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/32—Pulse-control circuits
    • H05B45/325—Pulse-width modulation [PWM]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

Definitions

  • the present invention relates to the technical field of lamps, in particular to a PWM pulse width modulation method and device.
  • PWM pulse width modulation modulates the duty cycle of a series of pulses to equivalently obtain the waveform of a signal with a proportional power output.
  • the PWM modifiable gray scale GRAY GCLK/FREQ
  • the PWM gray scale GRAY is inversely proportional to the PWM refresh frequency FREQ, that is, the larger the PWM gray scale GRAY, the smaller the PWM frequency FREQ , So that the PWM gray scale GRAY and the PWM refresh frequency FREQ cannot be increased at the same time.
  • the embodiment of the present invention provides a PWM pulse width modulation method and device, which can increase the PWM gray scale GRAY and the PWM refresh frequency FREQ.
  • an embodiment of the present invention provides a PWM pulse width modulation method, which includes at least the following steps:
  • the PWM gray scale g is output in one PWM period t, and the refresh frequency FREQ is increased by reducing the PWM gray scale g, wherein the PWM gray scale g is less than or equal to the preset value Minimum PWM gray scale;
  • the method further includes:
  • the PWM pulse width is sequentially increased for modulation.
  • the modulation is performed by sequentially increasing the PWM pulse width within the frame rate refresh period T, specifically:
  • the frame rate refresh period T is greater than the PWM refresh period.
  • the embodiment of the present invention also provides a PWM pulse width modulation device, including a microprocessor, for:
  • the PWM gray scale g is output in one PWM period t, and the refresh frequency FREQ is increased by reducing the PWM gray scale g, wherein the PWM gray scale g is less than or equal to the preset value Minimum PWM gray scale;
  • the square microprocessor is also used for:
  • the PWM pulse width is sequentially increased for modulation.
  • microprocessor is also used for:
  • the frame rate refresh period T is greater than the PWM refresh period.
  • the present invention provides a PWM pulse width modulation method and device, any of the embodiments has the following beneficial effects:
  • the PWM gray scale GRAY can be increased, and the PWM refresh frequency FREQ can be increased.
  • Fig. 1 is a flow chart of the PWM pulse width modulation method in an embodiment of the present invention
  • FIG. 2 is a schematic diagram of the PWM pulse width sequentially increasing modulation principle diagram of the PWM pulse width modulation method in the embodiment of the present invention
  • Fig. 3 is a schematic diagram of the sequential incremental modulation of the PWM pulse width of the PWM pulse width modulation method in the embodiment of the present invention.
  • an embodiment of the present invention provides a PWM pulse width modulation method, which includes at least the following steps:
  • the method further includes:
  • the modulation is performed by sequentially increasing the PWM pulse width within the frame rate refresh period T, specifically:
  • the frame rate refresh period T is greater than the PWM refresh period.
  • Figure 2 demonstrates the PWM output waveform with increasing dimming gray.
  • the PWM dimming gray increases with the repetitive cycle of the period T.
  • the frame rate refresh period is T
  • the minimum PWM period is t
  • an embodiment of the present invention also provides a PWM pulse width modulation device, including a microprocessor, for:
  • the PWM gray scale g is output in one PWM period t, and the refresh frequency FREQ is increased by reducing the PWM gray scale g, wherein the PWM gray scale g is less than or equal to the preset value Minimum PWM gray scale;
  • the square microprocessor is also used for:
  • the PWM pulse width is sequentially increased for modulation.
  • microprocessor is also used for:
  • the frame rate refresh period T is greater than the PWM refresh period.
  • the present invention provides a PWM pulse width modulation method and device, which has the following beneficial effects:
  • Dimming gray scale GRAY is composed of the sum of multiple PWM gray scales
  • the PWM refresh frequency and frame rate are not equal, and the frame rate refresh period is greater than the PWM refresh period
  • the PWM pulse width increases in sequence with the grayscale increment. Within a frame rate refresh period, each PWM increases in sequence with the minimum grayscale.

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  • Liquid Crystal Display Device Control (AREA)
  • Liquid Crystal (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)

Abstract

L'invention concerne un procédé et un dispositif de modulation d'impulsions en largeur (MIL). Le procédé consiste à, quand une horloge (GCLK) est fixée à une valeur prédéfinie, délivrer en sortie des échelles de gris MIL(g) dans un cycle MIL (t), et augmenter une fréquence de rafraîchissement (FREQ) par réduction des échelles de gris MIL (g), les échelles de gris MLI (g) étant inférieures ou égales à une échelle de gris MIL minimale prédéfinie ; acquérir une échelle de gris de gradation (GRAY) lors de l'ajout d'un nombre N des échelles de gris MIL (g) et un cycle de rafraîchissement de fréquence d'image (T) pour sortie MLI, et augmenter l'échelle de gris de gradation (GRAY) par augmentation du cycle de rafraîchissement de fréquence d'image, N étant un nombre entier supérieur ou égal à 1. Les modes de réalisation de la présente invention augmentent l'échelle de gris (GRAY) pour MLI et augmentent en outre la fréquence de rafraîchissement (FREQ) de MIL.
PCT/CN2020/117964 2019-11-29 2020-09-26 Procédé et dispositif de modulation d'impulsions en largeur (mil) WO2021103799A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201911212228.6 2019-11-29
CN201911212228.6A CN110996449B (zh) 2019-11-29 2019-11-29 一种pwm脉冲宽度调制方法及装置

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WO2021103799A1 true WO2021103799A1 (fr) 2021-06-03

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WO (1) WO2021103799A1 (fr)

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CN110996449B (zh) * 2019-11-29 2021-12-21 广州市雅江光电设备有限公司 一种pwm脉冲宽度调制方法及装置
CN113851074B (zh) * 2020-06-28 2023-07-28 深圳市明微电子股份有限公司 一种led驱动脉冲调制方法及装置
CN116997051B (zh) * 2023-09-27 2023-12-08 中科(深圳)无线半导体有限公司 一种led调光方法和装置

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