LED constant-current drive circuit with double-drive unit and device
A constant current drive, double drive technology, applied in the direction of lamp circuit layout, lighting devices, electric light sources, etc., can solve the problem of affecting the light effect of far and near light, affecting the brightness and service life of LED, failing to meet the requirements of far and near light distribution, etc. problem, to achieve the effect of stable performance and simple structure
Active Publication Date: 2015-04-29
JIAXING GUANGTAI LIGHTING
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Problems solved by technology
However, the constant voltage control of traditional AC / DC or DC / DC cannot play the role of constant current, so it will affect the brightness and service life of the LED
[0004] At present, in order to save costs, one more drive circuit is used to complete the control of far and near light. By changing the resistance value of the sampling resistor, the size of the circuit voltage signal fed back to the drive circuit is changed, which affects the output of the drive circuit. The purpose of different light intensities, but the use of a drive circuit often fails to meet the light distribution requirements of far and near light, which affects the light effect of far and near light
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[0020] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments described here are only used to explain the present invention, not to limit the present invention.
[0021] Such as figure 1 as shown, figure 1 It is a block diagram of a specific embodiment of the LED constant current drive circuit using dual drive units of the present invention. An LED driving circuit provided by the present invention, such as figure 1 As shown, it includes a 12-85V DC power supply A, a reverse polarity protection unit B, a first constant current drive unit C, a second constant current drive unit E, a first lighting unit D, and a second lighting unit F; The power input terminal of the polarity protection unit B is electrically connected to the DC power supply A, and the power output ...
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The invention relates to an LED constant-current drive circuit with a double-drive unit and an LED device with the LED constant-current drive circuit. A DC power supply of the LED constant-current drive circuit provides two types of power, namely, the high-beam end power and the low-beam end power. Reversed polarity protection is conducted on the LED constant-current drive circuit through a reversed polarity protection unit. Voltage-drop constant-current processing is conducted on the high-beam end power through a first constant-current drive unit, and the high-beam end power where voltage-drop constant-current processing is conducted is provided for a first LED illumination unit so as to drive the first LED illumination unit. Voltage-drop constant-current processing is conducted on the high-beam end power or the low-beam end power through a second constant-current drive unit, and the high-beam end power or the low-beam end power where voltage-drop constant-current processing is conducted is provided for a second LED illumination unit so as to drive the second LED illumination unit. By means of the LED constant-current drive circuit and the LED device, no big fluctuation happens to currents flowing through LEDs, and the LED constant-current drive circuit and the LED device have the advantages of being simple in structure and stable in performance.
Description
technical field [0001] The invention relates to the field of LED automobile lighting, in particular to an LED constant current drive circuit using double drive units and an LED automobile lighting device comprising the circuit. The invention also includes an LED automobile lamp using the circuit. Background technique [0002] LED (LightEmittingDiode, light-emitting diode) lighting, as a new lighting technology, has attracted worldwide attention and is known as the third revolution in the history of human lighting. Compared with the relatively traditional halogen low-voltage lighting, the use of high-brightness LEDs as interior decoration lights, landscape lighting, and automotive lighting has many advantages. High-brightness LEDs can provide greater brightness with less power consumption, and have the characteristics of energy saving, environmental protection, shock resistance, long service life and quick turn-on. [0003] Due to the difference in ambient power supply volt...
Claims
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IPC IPC(8): H05B37/02
Inventor 朱成杰万海峰刘鹤鸣
Owner JIAXING GUANGTAI LIGHTING