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Digital LED drive circuit based on array open circuit number observation

A technology of LED drive and detection circuit, which is applied in the direction of lamp circuit layout, electric light source, lighting device, etc., and can solve the problems of complex control circuit and poor effect

Active Publication Date: 2014-08-13
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention proposes a digital LED drive circuit based on the observation of the number of open circuits in the array in order to solve the defects of poor effect or complicated control circuit

Method used

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  • Digital LED drive circuit based on array open circuit number observation
  • Digital LED drive circuit based on array open circuit number observation
  • Digital LED drive circuit based on array open circuit number observation

Examples

Experimental program
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specific Embodiment approach 1

[0012] Specific implementation mode one: combine figure 1 Describe this embodiment, this embodiment includes a power factor correction circuit 1, a half-bridge resonant circuit 2, several open-circuit fault detection circuits 3, a current sampling circuit 4 and a control circuit 5; the input end of the power factor correction circuit 1 is connected to an AC power supply , the half-bridge resonant circuit 2 includes a first capacitor C1 to a fourth capacitor C4, a first field effect transistor Q1, a second field effect transistor Q2, a first resistor R1 to a third resistor R3, an inductor L1 and a first diode D1 to the fourth diode D4; one output terminal of the power factor correction circuit 1 is simultaneously connected to one terminal of the first capacitor C1, the drain of the first field effect transistor Q1 and one terminal of the first resistor R1, and the other terminal of the first resistor R1 One end is connected to one end of the second capacitor C2, and the other e...

specific Embodiment approach 2

[0014] Specific implementation mode two: combination figure 2Describe this embodiment. The difference between this embodiment and the specific embodiment is that the power factor correction circuit 1 includes the fifth diode D5 to the eighth diode D8, the eighth capacitor C8 to the fourteenth capacitor C14, the ninth resistor R9 to the twentieth resistor R20, the first chip U1, the fifth triode Q5, the transformer LM3 and the sixth field effect transistor Q6; the anode of the fifth diode D5 is connected to the cathode of the seventh diode D7 for power One input terminal of the power factor correction circuit 1, the anode of the sixth diode D6 and the cathode of the eighth diode D8 are connected as the other input terminal of the power factor correction circuit 1, the cathode of the fifth diode D5, the cathode of the sixth diode D8 The cathode of the diode D6, one end of the eighth capacitor C8, and one end of the ninth resistor R9 are simultaneously connected to an input end ...

specific Embodiment approach 3

[0015] Specific implementation mode three: combination figure 1 and figure 2 Describe this embodiment, the difference between this embodiment and specific embodiment 1 or 2 is that the open fault detection circuit 3 includes a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7 and an optocoupler U; the fourth resistor One end of R4 is connected to one end of the seventh resistor R7 as an input end of the open fault detection circuit 3, and the other end of the seventh resistor R7 is connected to an input end of the optocoupler U as the other input end of the open circuit fault detection circuit 3, The other input end of the optocoupler U is connected to the other end of the fourth resistor R4, one output end of the optocoupler U is connected to the analog ground with one end of the sixth resistor R6, and the other end of the sixth resistor R6 is connected to the other end of the optocoupler U at the same time. One output end and one end of th...

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Abstract

A digital LED drive circuit based on array open circuit number observation relates to an LED drive circuit, overcomes defect of bad effect or quite complex control circuit, and comprises a power factor correcting circuit, a semi-bridge resonant circuit, a plurality of open circuit fault detection circuits, a current sampling circuit and a control circuit. A method is provided and comprises the following steps: automatically detecting faults in the open circuit of the LED; and automatically regulating current closed-loop reference value according to the number of open circuit LED strips. Both the simplicity and the low cost of the circuit are considered, and the contradiction is solved. The digital LED drive circuit has important significance in improving the reliability and lowering cost of an LED lamp. Since the range of the change of the supply voltage of an LED array is small during the regulation of the current, the resistance value of the LED is acquired according to a rated current according to each LED. According to the normal working state of a parallel branch, resonant inductance and the value of the fourth resistor, the total current reference value of different open circuit LED parallel units is calculated. Through detecting the number of the open circuit LED series units to regulating switch frequency, the constant current drive is achieved.

Description

technical field [0001] The invention relates to an LED driving circuit. Background technique [0002] With the continuous maturity of LED packaging technology and continuous improvement of manufacturing process, in the field of lighting, high-power LEDs have begun to be applied in large quantities. In 2009, my country implemented the "Ten Cities, Ten Thousand Lamps" project to promote the development of LEDs in China. LED street lighting has developed rapidly. At present, LED street lighting demonstration streets have been launched in many cities. [0003] The power of LED light sources for street lighting is mostly between 100W-200W. Since the power level of a single LED is relatively low, it is necessary to form an LED array by connecting in series and parallel. For LEDs, the optimal driving method is constant current power supply. However, many LED street lights in street lighting currently use constant voltage drivers, which has a great impact on the life of LEDs. [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02H05B37/03
Inventor 张相军徐殿国佟德军朱辉孙希艳杨华王懿杰王斌泽
Owner HARBIN INST OF TECH
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