Maximum dimming parameter collection system and method for lamp group with unknown rated current

Abstract

Disclosed are a maximum dimming parameter collection system and method for a lamp group with an unknown rated current. The lamp group comprises one lamp or more lamps connected in parallel at a constant voltage for operation. The maximum dimming parameter collection system comprises a dimming preset limited parameter and rated voltage preset module, an actual dimming parameter value collection module, a judgment module, a working pattern switching module, a limited current working module, an actual current value collection module and a maximum dimming parameter and dimming preset parameter value assignment module. By virtue of the maximum dimming parameter collection system, the maximum dimming parameter I<ref> of the lamp group with the unknown or changeable rated current can be collected in proper time, so that dimming within the full-range at any time is effective, and a phenomenon of a dead region occurring when the dimming amount is greater than 70% or 50% can be avoided, thereby further improving light use experience of a user.

Description

technical field [0001] The invention relates to the field of power supplies for LED lamps, in particular to a system and method for collecting maximum dimming parameters of a lamp group with unknown rated current. Background technique [0002] In general daily life, various lighting devices can be seen everywhere, for example, fluorescent lamps, street lamps, table lamps, art lamps and the like. Among the above-mentioned lighting devices, traditionally, most of them use tungsten filament bulbs as light sources. In recent years, light-emitting diodes (LEDs) have been used as a source of light due to advances in technology. What's more, in addition to lighting equipment, for general traffic signs, billboards, car lights, etc., light-emitting diodes are also used as light sources instead. As mentioned above, the advantage of using light-emitting diodes as a light source is that it saves power and has higher brightness, so it has gradually become popular in use. [0003] With...

AI Technical Summary

Problems solved by technology

In the prior art, there are many LED power supplies with variable output power that can change the output brightness of LED lamps. However, these LED power supplies give users a bad light experience in certain occasions, such as display lighting, such as In museums, many users like to use mobile phones or cameras to take pictures of displayed items. However, the existing LED power supply with variable output power makes the light source provided by LED lights often form a lot of noise in the photos taken by mobile phones or cameras. Streaks, the so-called "phase flicker", which distort the photo and affect the user's light experience

[0004] In the prior art, the brightness of the LED lamp is adjusted by adjusting the current, which can avoid the phase flicker, but this method is suitable for constant current lamps or lamp groups, but for The value is unknown, such as in a freezer or a showcase, the customer does not know how many lights are used to form a lighting group, but only wants to use a constant voltage dimming power supply for power supply, so the current flowing through the lighting system is unknown

If you still use the existing constant current dimming power supply, its maximum dimming current is often constant, which will make the output of the lamps have reached when the dimmer is adjusted to 70% or 50% or other ranges, that is, there is no full capacity. The brightest, the remaining 30% or 50% or even more dimming margin is redundant and ineffective, which will reduce the user's experience of using the lamp

The primary reason for the above phenomenon is that it is difficult for the dimming power supply to determine the maximum current of the lamp group whose rated current is unknown.

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