Power supply apparatus for an LED lamp

A power supply apparatus for an LED lamp using an isolation transformer to convert a high voltage AC input signal into a low voltage AC signal and thus generate a driving voltage for driving an LED lamp, comprising:

• a waveform and frequency modulation module disposed on the primary side of the isolation transformer for modulating an input waveform and a frequency f, wherein the frequency f is ≧60 Hz;
• a secondary rectifier filter module disposed on the secondary side of the isolation transformer for converting the low voltage AC signal after passing through the isolation transformer into the driving voltage, wherein the driving voltage is a low voltage ripple signal and a peak-to-peak value ΔV of the low voltage ripple signal is ≧1 V;
• and
• the secondary rectifier filter module comprises a secondary rectifier circuit and a secondary filter circuit, and the secondary rectifier filter circuit has a non-electrolytic capacitor, wherein the non-electrolytic capacitor is a metalized polymer film capacitor or a Mylar capacitor.