Patent ID: 6956752

Claim:
A power supply apparatus, for converting an input voltage into a first output voltage and a second output voltage and for providing a predetermined power-on and/or power-off sequence, wherein the first output voltage and the second output voltage are put into and/or out of operation in a specific sequence, the power supply apparatus comprising a first converter unit having an input for receiving the input voltage, storage means coupled to said input for storing the input voltage, and an output for supplying the first output voltage, characterized in that the power supply apparatus further comprises a second converter unit having an input coupled to the output of the first converter unit, second storage means coupled to the input for storing a voltage applied to the input, and an output for supplying the second output voltage, wherein upon application of said input voltage to said power supply apparatus, voltage from said first converter unit increases to said first output voltage, and when the voltage from said first converter unit reaches a certain voltage, the voltage from said second converter unit increases to said second output voltage, and wherein upon removal of said input voltage from said power supply apparatus, said first converter unit begins to discharge said first storage means and eventually said output voltage drops below said first output voltage, and the second converter unit then begins to discharge said second storage unit until subsequently said output voltage drops below said second output voltage.