High voltage discharge lamp device

A device comprising:

• first and second step-up DC-DC converters connected to a power switch for supplying a first electric voltage and a second electric voltage, respectively;
• polarity switching means comprising a pair of switching means for alternatively switching between said first electric voltage and said second electric voltage, said first electric voltage having a polarity opposite to said second electric voltage;
• and
• a control circuit for changing a switched state of said pair of polarity switching means, wherein said pair of switching means operates in synchronization with ultra-low frequency signals generated by said control circuit.

A device comprising:

• first and second step-up DC-DC converters connected to a power switch for supplying a first electric voltage and a second electric voltage, respectively, said first electric voltage having a polarity opposite to said second electric voltage;
• a first transistor and a second transistor, connected to said first step-up DC-DC converter and said second step-up DC-DC converter respectively, wherein said first transistor and said second transistor alternatively switch between a first switched state in which said first transistor is on and said second transistor is off and said second electric voltage is supplied to a lamp, and a second switched state in which said first transistor is off and said second transistor is on and said first electric voltage is supplied to said lamp;
• and
• a control circuit for changing between said first switched state and said second switched state.