Driving device and illumination system

An illumination system comprising:

• a first illumination device comprising a plurality of filaments and turned on according to output power;
• a first converting module converting input power into direct current (DC) power, wherein the first converting module comprises a pair of first input terminals receiving the input power and a pair of first output terminals coupled to a first node and a second node and outputting the DC power;
• a first capacitor coupled between the first node and a third node;
• a second capacitor coupled between the second and third nodes;
• a first clamping module connected to a first specific capacitor in parallel, wherein the first specific capacitor is among the first and second capacitors;
• and
• a second converting module converting the DC power to generate the output power, wherein the second converting module comprises a second input terminal pair coupled to the first and second nodes and a second output terminal pair outputting the output power to turn on the illumination device, wherein the first capacitor is directly connected to the second capacitor.