Light source driving device

A light source driving device, comprising:

• a sensing unit and a processing unit, wherein the sensing unit at least comprises a microwave sensing module;
• the sensing unit is at least used for sensing whether any human activity exists within the action range based on microwave sensing according to a certain microwave sensing cycle, and periodically outputting a sensing signal to the processing unit;
• the processing unit is used for processing the sensing signal, so that the driving device can adaptively control the turn-on and turn-off of the light source and the brightness change of the light source
• the processing unit comprises a signal processing module, a control module and a power supply driving module;
• the signal processing module is used for processing a signal output by the sensing unit into a digital signal required by the control module and outputting the digital signal to the control module;
• the control module is used for outputting a control signal to the power supply driving module after conducting fuzzy operation on the received digital signal and comparing the digital signal with control strategies in a database;
• the power supply driving module is used for controlling the turn-on and turn-off of the light source and controlling the brightness change of the light source according to the control signal;
• wherein control strategies in a database comprise the following rules:
• (1) when the light source is in the turn-off state, if the digital signal is judged to be unchanged by comparing the current sensing moment with the sensing moment in the last cycle, a control signal in the turn-off state is maintained continuously, and the light source maintains the turn-off state;
• or else, a control signal is outputted and maintained, so that the working state of the light source is regulated to the working state corresponding to the current environment illuminance;
• and
• (2) when the light source is currently in a working state at a certain brightness level, if the digital signal is judged to be unchanged by comparing the current sensing moment with the sensing moment in the last cycle, a control signal in the current working state is maintained continuously, and the light source continues to maintain the working state at the current brightness level;
• if at a certain interval sensing moment after a certain interval of the current sensing moment, the digital signal is still judged to be unchanged within the whole certain interval, then a control signal is outputted, so that the working state of the light source is regulated to the working state with one level below the current brightness level;
• or else, a control signal is outputted, so that the working state of the light source is regulated to the working state with one level above the current brightness level, wherein
• the working state with one level below the current brightness level comprises the working state with the lowest brightness level being 0 and the light source being turned off;
• and
• the working state with one level above the current brightness level comprises the working state with the maximum brightness level being 100% and of the rated power.