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Control method of lighting device using dc-dc converter and related circuit

A DC-DC, lighting device technology, applied in lighting devices, output power conversion devices, display devices, etc.

Active Publication Date: 2020-06-02
TEXAS INSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, unlike an analog loop, a digital loop only has some fixed possibility of the duty cycle of the PWM pulse when the duty cycle is changed in the form of a step change

Method used

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  • Control method of lighting device using dc-dc converter and related circuit
  • Control method of lighting device using dc-dc converter and related circuit
  • Control method of lighting device using dc-dc converter and related circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0013] The figures are not necessarily drawn to scale.

[0014] figure 1 is a block diagram of a pulse width modulated (PWM) lighting control circuit for driving a lighting device in an example scenario. Some example embodiments can be used with figure 1 Modifications and improvements in the PWM lighting control circuit are used together, and the reference Figure 2 to Figure 5 Some example embodiments are described.

[0015] like figure 1 As shown, a PWM lighting control circuit (hereinafter referred to as a control circuit) 100 provides a lighting control signal to a lighting device 150 . Illumination device 150 may be a light emitting diode (LED) or a light amplification by stimulated emission of radiation (LASER) device, as well as any other such light source used in time-of-flight (ToF) imaging applications. The lighting device 150 may also be used in other applications, such as lighting applications, flashes in cameras, optical communications, or any application inv...

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PUM

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Abstract

In an example of the described method (400) of controlling a lighting device by an output signal of a DC-DC converter, the output signal is controlled by a PWM signal. The method (400) includes receiving (405) a feedback signal corresponding to a change in the output signal relative to a predetermined output signal, and determining (410) a target duty cycle for the PWM signal based on the feedback signal. The PWM signal of the target duty cycle enables the DC-DC converter to generate a predetermined output signal. The method (400) includes providing (415) a PWM signal with an effective duty cycle equal to the target duty cycle within N switching pulses of the PWM signal to a DC-DC converter. The method (400) provides (420) by providing (420) M switching pulses of a first PWM signal of a first duty cycle, and by providing (425) N-M switching pulses of a second PWM signal of a second duty cycle. (415) PWM signal.

Description

[0001] The present invention relates to mechanisms for providing constant current drive to lighting devices such as LEDs and LASERs using DC-DC converters. Background technique [0002] Lighting devices, which are very low power consumption devices, are used in many applications, such as vehicles, household applications, indicators, data communications, and applications involving the use of light sources. Examples of these devices include, but are not exhaustive, light emitting devices (LEDs) and light amplification by stimulated emission of radiation (LASER) devices. These low power illuminators are also used as light sources in time-of-flight (ToF) imaging applications. A ToF camera works on the principle of illuminating an object by a light source and detecting the light reflected from the illuminated object. Additionally, an image of the illuminated object is constructed based on a phase difference between light emitted by the illumination device and light reflected from ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B47/17H05B47/165H05B44/00
CPCY10S362/80Y02B20/30H05B45/38H05B45/3725H05B45/375H05B45/385H05B41/3927G09G2320/064H02M3/156
Inventor B·帕蒂尔J·文卡塔拉曼
Owner TEXAS INSTR INC