Switching circuit system for adjusting brightness and method thereof

A switching circuit system comprising:

• a rectification circuit configured to convert an alternating current power supply to a direct current regulated power supply to supply voltage to the switching circuit system;
• a transformer connected to the rectification circuit;
• a light-emitting unit connected to the transformer;
• a touch panel comprising a plurality of touch sensors, each of the touch sensors corresponding to a particular location on the touch panel, and generating a signal in response to user touch;
• and
• a central processing unit (CPU) configured to determine that a first user operation is taken place on the touch panel when first and second touch signals from at least two touch sensors have been received within a predetermined time interval, and further determine a touch track according to the sequence in which the first and second touch signals were received when a first user operation is determined, the CPU further configured to direct the transformer to change the value of the voltage output to the light-emitting unit according to the determined touch track to control the switching circuit system to execute a first function.