Lighting drive, lighting system and control method

A lighting driver, comprising:

• a driver input adapted to receive an alternating current power supply from a fluorescent lighting ballast;
• a shunt device connected to the driver input and adapted to selectively shunt the power supply;
• a controller adapted to operate or not operate the shunt device;
• wherein the controller is adapted to operate the shunt device during a portion of a cycle of the alternating current power supply, such that a current is delivered to a lighting load only during the portion of the cycle of the alternating current power supply when the shunt device is not operated;
• and
• a zero crossing detector adapted to generate a detection signal and to provide the detection signal to the controller to operate the shunt device upon the detection signal, wherein said detection signal is a zero crossing detection signal,
• wherein the zero crossing detector comprises:
• a detection circuit adapted to analyze an input voltage at the driver input and generate the detection signal (ZCD) accordingly, when the input voltage is detected;
• and
• a correction circuit adapted to generate the detection signal (ZCD) after a time delay from an end of operating the shunt device, even when said input voltage is not detected, wherein said correction circuit is adapted to start to time a time constant corresponding to the time delay at the end of operating the shunt device and to generate the detection signal (ZCD) after the time constant expires when said input voltage is not detected.