Waveform shaping circuit for spurious harmonic suppression

A lighting system comprising:

• a lighting control unit in control communication with a luminaire, the lighting control unit including a line voltage input port and a neutral line input port;
• a data concentrator unit (DCU) in wireless communication with the lighting control unit;
• a waveform shaping circuit external to the lighting control unit and in serial electrical communication with input terminals of the lighting control unit;
• the waveform shaping circuit comprising:
• a line voltage input connectable to a line voltage power source;
• a line voltage output, the line voltage output connectable to the lighting control unit input voltage port;
• a neutral line input connectable to a neutral line of the line voltage power source;
• the waveform shaping circuit including an impedance matching network configured to alter an input impedance of the lighting control circuit;
• and
• the waveform shaping circuit including a capacitive element connected from the neutral line to a protected earth ground, the capacitive element configured to bypass spurious harmonics generated by operation of the lighting control unit.

A lighting system comprising:

• a lighting control unit in control communication with a luminaire, the lighting control unit including a line voltage input port and a neutral line input port;
• a data concentrator unit (DCU) in wireless communication with the lighting control unit;
• a waveform shaping external to the lighting control unit and in serial electrical communication with input terminals of the lighting control unit;
• the waveform shaping circuit comprising:
• a line voltage input connectable to a line voltage power source,
• a line voltage output, the line voltage output connectable to the lighting control unit input voltage port,
• a neutral line input connectable to a neutral line of the line voltage power source, and
• a neutral line output connectable to the lighting control unit neutral line input port;
• the waveform shaping circuit including an impedance matching network configured to alter an input impedance of the lighting control circuit;
• the impedance matching network is selected from the group consisting of:
• a first impedance matching network that includes a resistor in series with the line voltage input of the waveform shaping unit and a bypass switch in parallel with the resistor;
• and
• a second impedance matching network that includes a first ferrite choke surrounding the line voltage input and the neutral line input of the waveform shaping unit, a second ferrite choke surrounding the lighting control unit input line voltage port and the lighting control unit neutral line input port, a shunt capacitor located between the line voltage input and the neutral line input, a bypass capacitor located between the neutral line input and a protected earth ground, and a resistor in series between the neutral line input and the lighting control unit neutral line input port;
• and
• the shunt capacitor configured to bypass spurious harmonics generated by operation of the lighting control unit.