Constant-current control method for LED driving input-output low-voltage difference

A technology of LED driving and constant current control, applied in energy-saving control technology, electrical components, etc., can solve the problem of increasing current flowing through the lamp bead

Active Publication Date: 2020-03-06
深圳智芯半导体科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a constant current control method of LED drive input and output low pressure difference, which solves the problem of the increase of current flowing through the lamp bead or the flickering of the lamp when the output voltage drop of the lamp bead is close to the input voltage drop. The problem

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  • Constant-current control method for LED driving input-output low-voltage difference

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Embodiment Construction

[0030] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0031] Such as Figure 1 to Figure 8 As shown, a specific embodiment of the present invention is a constant current control method for LED drive input and output low voltage dropout, including an LED lamp, the LED lamp is electrically connected to a switching power supply drive control chip U1, a MOS turn-on time limiting module and a current detection comparator ; The switching power supply drive control chip U1 detects the current by CS, the MOS turn-on time limit module is provided with a TON limit circuit, and the current detection comparator controls the shutdown of the MOS Q1 by detecting the current in real time and the output stage of the error amplifier EA;

[0032] The constant current control method of LED driver input and output low voltage dropout is as follows:

[0033] a. When the MOS Q1 is turned on, the switching power supply drives the cont...

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Abstract

The invention relates to a constant-current control method for an LED driving input-output low-voltage difference, including an LED lamp, a switching power supply driving control chip U1, an MOS turn-on time limiting module, and a current detection comparator, wherein the switching power supply driving control chip U1 detects a current by a CS, the MOS turn-on time limiting module is provided witha TON limiting circuit, the current detection comparator controls the turning off of an MOS Q1 by detecting the current in real time and by the output stage of an error amplifier EA, the switching power supply can fix the turn-on time of the MOS Q1 when the input and output voltages are close to each other, the error amplifier EA can also adjust the turn-off time of the MOS or adjust the duty cycle of MOS Q1 to achieve a constant current. The constant-current control method effectively solves an increase in current flowing through a lamp bead or the flicking of the lamp bead when an output lamp voltage drop and an input voltage drop are close to each other.

Description

technical field [0001] The invention relates to the technical field of LED lighting, and more specifically refers to a constant current control method for LED drive input and output low pressure drop. Background technique [0002] Existing LEDs are more and more widely used in stage lighting, building lighting and garden lighting because of their advantages such as long service life, energy saving, environmental protection and pure color. Since the current LED DCDC constant current step-down scheme can achieve the purpose of multi-connection lamps, the voltage difference between the input voltage and the output lamp voltage will be very close. At this time, the DCDC will enter a switching state close to 100% duty cycle. The output current will increase significantly, and the internal current detection circuit of the chip is in an abnormal working state, which may easily cause flashing or even burn out the lamp beads. [0003] Currently common average current DCDC step-down ...

Claims

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Application Information

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IPC IPC(8): H05B45/30
CPCY02B20/40
Inventor 方曙谢靖吴东生
Owner 深圳智芯半导体科技有限公司
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