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Method of driving light sources, and corresponding device and system

專利號(hào)
US11516900B2
公開日期
2022-11-29
申請(qǐng)人
OSRAM GmbH（DE Munich）
發(fā)明人
Francesco Angelin; Alessio Griffoni
IPC分類
H05B45/325; H05B45/10; H05B45/335
技術(shù)領(lǐng)域
pwm,vfm,frequency,in,modulation,signal,value,pulse,modulating,lighting
地域： Munich

摘要

A method for driving one or more electrically powered light sources, such as LED modules, may include applying a pulse-width-modulated signal thereto having a pulse-repetition frequency and a duty-cycle, the duty-cycle being selectively variable in order to vary the intensity of light emitted by the light source or light sources. To counter the occurrence of temporal light artefacts, or TLAs, the method may include frequency modulating the pulse-width-modulated signal (VPWM) by varying the pulse-repetition frequency thereof around a certain value between a lower frequency value and a higher frequency value, thus giving rise to a signal with combined FM/PWM modulation.

說明書

CROSS-REFERENCE TO RELATED APPLICATION

The present patent application claims priority, according to 35 U.S.C. § 119, from Italian Patent Application No. 102020000013171 filed on Jun. 3, 2020, the entire disclosure of which is incorporated herein by reference.

TECHNICAL FIELD

The present disclosure relates to lighting apparatuses.

One or more embodiments may find use, for example, in lighting systems that use electrically powered solid-state light sources, for example LED sources.

BACKGROUND

The rate at which solid-state lighting (SSL) sources can change the intensity of the light radiation emitted is one of the main drivers underlying the revolution that we are witnessing in the world of lighting and lighting applications.

Linked to the rate at which it is possible to change the intensity of the light radiation emitted is the direct transfer, whether desired or not, of the modulation of the driving current into a modulation of the luminous flux emitted.

This light modulation can give rise to changes in the perception of the environment.

In some applications, such as very specific entertainment, scientific, or industrial applications, such a change of perception due to modulation of the light may be a desired effect.

For the majority of applications and daily activities such a change may, instead, be detrimental and undesirable.

權(quán)利要求

1
The invention claimed is:1. A method, comprising:driving at least one electrically powered light source applying thereto a pulse width modulated signal having a pulse repetition frequency and a duty-cycle;selectively varying the duty cycle of the pulse width modulated signal to vary the light intensity emitted by the at least one electrically powered light source; andfrequency modulating the pulse width modulated signal varying the pulse repetition frequency thereof around a certain value between a lower frequency value and an upper frequency value;wherein the method comprises frequency modulating the pulse width modulated signal varying the pulse repetition frequency thereof between the lower frequency value and the upper frequency value with a non-uniform frequency variation keeping the pulse repetition frequency of the pulse width modulated signal between said certain value and said upper frequency value for times longer than the times the pulse repetition frequency of the pulse width modulated signal is kept between said certain value and said lower frequency value.2. The method of claim 1, wherein the upper frequency value is about 2 kHz.3. The method of claim 1, wherein said certain value is approximately 1700 Hz.4. The method of claim 1, wherein said certain value is the average value of said upper frequency value and said lower frequency value.5. A driver circuit configured to apply to at least one electrically powered light source a pulse width modulated signal having a pulse repetition frequency and a duty-cycle, wherein the driver circuit is configured to selectively vary the duty-cycle of the pulse width modulated signal to vary the light intensity emitted by the at least one electrically powered light source; wherein the driver circuit is configured to frequency modulate the pulse width modulated signal varying the pulse repetition frequency thereof around a certain value between a lower frequency value and an upper frequency value with the method of claim 1.6. The driver circuit of claim 5, further comprising a frequency modulator configured to produce a plurality of different frequency modulation signals to frequency modulate the pulse width modulated signal varying the pulse repetition frequency thereof around said certain value between said lower frequency value and said upper frequency value.7. A lighting system, comprising:a driver circuit according to claim 5, andat least one electrically powered light source coupled to said driver circuit to have applied thereto said pulse width modulated signal having the pulse repetition frequency thereof varying around a certain value between a lower frequency value and an upper frequency value.8. The lighting system of claim 7, wherein said at least one electrically powered light source comprises a solid state light source.9. The lighting system of claim 8, wherein said at least one electrically powered light source comprises a LED light source.
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