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

A technology of LED drive and visible light communication, applied in the direction of electrical components, etc., can solve problems such as harmonic pollution of the power grid, and achieve the effects of improving communication speed, circuit efficiency, and strong practicability

Active Publication Date: 2021-12-28
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

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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 power-separated single-stage LED drive circuit visible light communication modulation method. The luminance parameter required by visible light communication is converted into a communication electric power reference through a relational letter, and the sampling step-down Cuk circuit outputs and feeds back the communication electric power, which is compared with the communication electric power reference. P‑ref generates an error signal, and the second PI compensation network composed of an error amplifier outputs a control signal, and the control loop PWM modulation unit obtains the driving signal to drive the second power switch tube to perform power modulation required for brightness of visible light communication; sampling flyback The converter outputs the LED feedback lighting electric power, compares it with the reference electric power required for lighting, and obtains the lighting electric power error signal, which is modulated by the first PI compensation network formed by the error amplifier, optocoupler isolation, power factor correction PFC controller, etc. to obtain the PWM drive signal Driving the first power switch tube to modulate the AC power factor correction and power required by LED lighting. This method is beneficial to keep the illumination intensity constant while increasing 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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Patent Type & Authority Patents(China)
IPC IPC(8): H05B45/325H05B45/345H05B47/195
CPCH05B45/325H05B45/345H05B47/195
Inventor 林维明唐松林慧聪
Owner FUZHOU UNIV