Constant-voltage lamp strip driving device based on constant-current power supply capable of configuring output current

Abstract

The invention relates to a constant-voltage lamp strip driving device based on a constant-current power supply capable of configuring output current, which comprises the constant-current power supply, a driver and a lamp strip, the constant-current power supply is connected with the lamp strip through the driver, and the lamp strip is a constant-voltage lamp strip or a constant-current lamp strip; and according to the device, the constant-current dimming power supply and the constant-voltage lamp strip are combined, so that a good dimming effect can be obtained at high and low brightness. Compared with the prior art, theconstant-voltage lamp strip driving device has the advantages that the brightness of the constant-voltage light strip driven by the constant-voltage dimming power supply is kept consistent under the condition of long-distance high brightness, and the brightness of the constant-current light strip driven by the constant-current dimming power supply is good in consistency under the condition of low brightness.

Description

technical field [0001] The invention relates to an LED strip driving device, in particular to a constant-voltage strip driving device based on a constant-current power supply with configurable output current. Background technique [0002] At present, the LED strips on the market can be divided into constant voltage LED strips and constant current LED strips according to the driving mode. The constant voltage LED light strip is suitable for constant voltage dimming power supply. The light strip specifications include DC12V, 24V, 36V, 48V, etc. The output voltage of the power supply needs to match the voltage of the light strip in advance; the constant current LED light strip is suitable for For the constant current dimming power supply, the power supply can be freely configured according to the current specification of the light strip. [0003] Since the light strip transmits current through the transmission line, there is line loss in both constant current and constant volt...

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Problems solved by technology

[0010] Since the series resistance R of the constant-voltage type light strip is much larger than the dynamic resistance r of the lamp bead of the constant-current type light strip, it can be known from the above two formulas that under the same long-distance high-brightness line loss, the constant-voltage light driven by the constant-voltage power supply The current consistency of the constant current light strip driven by the constant current power supply is better than that of the constant current light strip, but due to the high brightness, the human eye is not sensitive to the difference; while at low brightness, the line loss of the constant current light strip is sharp The brightness difference of the constant current LED strip driven by the constant current power supply is much better than that of the long-distance constant voltage LED strip driven by the constant voltage power supply

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