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Visible light communication modulation method for power-separated single-stage LED drive circuit

A technology of LED driving and visible light communication, applied in electrical components and other directions, can solve problems such as harmonic pollution of power grid, and achieve the effect of improving communication speed, maintaining lighting intensity and circuit efficiency.

Active Publication Date: 2021-01-29
FUZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large number of power electronic devices connected to the power grid will inevitably cause serious harmonic pollution to the power grid

Method used

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  • Visible light communication modulation method for power-separated single-stage LED drive circuit
  • Visible light communication modulation method for power-separated single-stage LED drive circuit

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Embodiment Construction

[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] Such as figure 1 As shown, the present invention provides a power-separated single-stage LED drive circuit VLC modulation method, providing a single-stage LED drive circuit, including a single-phase AC input power supply u in , single-phase rectifier bridge DB, first power switch tube S 1 , the second power switch tube S 2 , the first power diode D 1 , the second power diode D 2 , the third power diode D 3 , the first inductance L 1 , the second inductance L 2 , the first output energy storage capacitor C S1 , the second output energy storage capacitor C S2 , output filter capacitor C O2 , Intermediate capacitance C n . A high frequency transformer Tx and an LED lamp load, wherein the high frequency transformer Tx includes a primary winding Np, a secondary main winding Ns1, and a secondary auxiliary winding Ns2.

[0...

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Abstract

The invention relates to a visible light communication modulation method for a power-separated single-stage LED drive circuit. A brightness parameter required by visible light communication is converted into a communication electric power reference through a relation transfer function, feedback communication electric power output by a voltage reduction Cuk circuit is sampled, an error signal is generated with the communication electric power reference Pref, a second PI compensation network formed by an error amplifier outputs a control signal, and a control loop PWM modulation unit obtains a driving signal to drive a second power switch tube to perform power modulation required by visible light communication brightness; lED feedback illumination electric power output by a flyback converteris sampled and compared with an electric power reference required by illumination to obtain an illumination electric power error signal, and the illumination electric power error signal passes through a first PI compensation network formed by an error amplifier, optical coupling isolation, a power factor correction PFC controller and the like. A PWM driving signal is obtained through modulation to drive the first power switch tube to modulate power required by AC network side power factor correction and LED illumination. The method is beneficial to keeping the illumination intensity constantand improving the communication rate.

Description

technical field [0001] The invention belongs to the technical fields of LED lighting driving power supply and visible light communication, and in particular relates to a power separation single-stage LED driving circuit modulation method for visible light communication. Background technique [0002] LED is one of the fourth-generation electric light sources with broad prospects because of its high efficiency, energy saving and environmental protection. Due to its steep volt-ampere characteristics, constant current control must be used to achieve the best lighting effect. Therefore, the research on LED drive circuits with high efficiency, high power factor and low ripple has important practical significance. [0003] With the rapid development of power electronic technology, power electronic devices have been widely used in industry and daily life. Due to the strong nonlinearity of the device, a large number of high-order harmonics are bound to be generated. A large number...

Claims

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Application Information

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IPC IPC(8): H05B45/325H05B45/345H05B47/195
CPCH05B45/325H05B45/345H05B47/195
Inventor 林维明唐松林慧聪
Owner FUZHOU UNIVERSITY