Illumination-intensity-adjustable no flickering visible light communication transmitting end controller
A technology of visible light communication and light intensity, applied in the field of visible light communication, can solve the problems that LED lights are easy to enter flicker mode, harmful to users, etc., and achieve reliable signal transmission, short development cycle, and good robustness.
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Embodiment 1
[0034] A visible light communication transmitter controller with adjustable light intensity and no flicker, including a constant current source drive circuit and a digital RLL encoding module, the constant current source drive circuit includes a constant current source parameter selection device and a constant current source circuit, The digital RLL encoding module includes an RLL encoding mode selection device and an RLL encoding circuit; the constant current source circuit performs real-time adjustment of constant current parameters under the control of the constant current source parameter selection device; the RLL encoding circuit is in the RLL Under the control of the encoding mode selection device, the encoding mode is adjusted in real time.
[0035]The digital RLL coding module codes and modulates signals through non-stop switching modes, and periodically provides 'on / off' control logic to the constant current source drive circuit within a control cycle; all signals that...
Embodiment 2
[0038] A working method of the controller as described in embodiment 1, comprising the steps of:
[0039] 1) Utilize the digital RLL encoding module to channel encode, pre-equalize and modulate the digital signal;
[0040] 2) The digital RLL encoding module periodically provides the control logic of 'on / off' to the constant current source drive circuit within a control cycle through the non-stop switching mode encoding modulated signal;
[0041] 3) The constant current source driving circuit provides a constant current source for the controlled LED lamp: when the control signal sent by the digital RLL encoding module is in the 'on' control logic state, the LED lamp is turned on by the current source On; when the control signal sent by the digital RLL encoding module is in the 'off' control logic state, the LED light is in the off state.
Embodiment 3
[0043] The working method as described in Embodiment 2, the difference is that in step 1), the digital RLL encoding module includes but not limited to Manchester encoding, differential Manchester encoding, 4B / 6B encoding and 8B / 10B encoding.
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