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LED linear drive topology

A linear drive and topology technology, applied to electrical components, electroluminescent light sources, lighting devices, etc., can solve problems such as damage, rise in junction temperature of LED lamp beads, and great influence on junction temperature

Active Publication Date: 2016-10-12
SHANGHAI SIMAX TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] It can be seen from the electrical characteristics of LEDs that the average forward current increases linearly with the increase of forward voltage, and a small change in the forward voltage of the LED after the forward conduction will cause a large change in the LED current, and The current has a great influence on the junction temperature of the LED. Excessive current can easily cause the junction temperature of the LED lamp bead to rise and be damaged.

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Embodiment Construction

[0024] see figure 1 , the content of the invention of this application is mainly based on solving the problem of self-detection transition switching in the linear driving scheme of lighting LED, and can realize the scheme that the total current flowing through the LED is basically constant, thereby reducing external components and reducing the cost of the scheme, and at the same time The processing and maintenance of the LED lighting device becomes simple. see figure 1 The basic schematic diagram of the multi-segment LED linear scheme, taking two-segment LED as an example, light-emitting diode D 11 and D 12 Series connection, LED D 11 There is a switching device M in series between the cathode and the ground terminal 11 and resistor R C1 and R C2 , LED D 12 There is a switching device M in series between the cathode and the ground terminal 12 and resistor R C2 , switching device M 11 and M 12 For example, it is composed of basic field effect transistors or bipolar t...

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Abstract

The invention mainly relates to an LED linear drive topology, comprising multiple levels of LEDs D1, D2...Dn and multi-level and multiple levels of current adjusting branches DRI1, DRI2...DRIN, which are connected in series, and a level of current adjusting branch DRIK is connected between a cathode terminal and a grounding terminal of any level of LED DK. Any level of current adjusting branch DRIK comprises a transistor QK and a sensing resistor RK, which are connected in series between the cathode terminal and the grounding terminal of the corresponding level of LED DK. A node at which the transistor QK and the sensing resistor RK in each level of current adjusting branch DRIK are interconnected is defined as a detecting node NODEK, and then each level of current adjusting branch DRIK further comprises a first operational amplifier AIK of which an inverting end is coupled to the detecting node NODEK and an output end is coupled to the control end of the transistor QK.

Description

technical field [0001] The present invention mainly relates to lighting electronic equipment, specifically, a LED linear drive topology and an LED lighting fixture with this topology are proposed. Background technique [0002] With the shortage of energy and the development of new technologies, cold light source LEDs with low operating voltage and high luminous efficiency are considered as new light sources for lighting. However, there are two key problems for the popularization and application of LED lighting equipment at present: one is the high price and the other is that the life of LED is greatly reduced due to the instability of the control circuit. According to statistics, about 70% of the failures of LED white light lighting fixtures are power supply problems, about 20% are circuit and structural problems, and less than 10% are LED single-tube quality problems. It also plays a decisive role, which requires choosing the most suitable AC-DC driver in the drive design....

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Application Information

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IPC IPC(8): H05B33/08H05B44/00H05B45/30H05B45/395
CPCH05B45/37Y02B20/30
Inventor 许明伟高智浩
Owner SHANGHAI SIMAX TECH CO LTD