Power source for supplying DC voltage by converting AC voltage from AC source

A power source comprising:

• an input rectifier for rectifying an AC input voltage and supplying an input DC voltage across a first rectifier terminal and a second rectifier terminal,
• a transformer having a primary coil with a first primary terminal and a second primary terminal, and a secondary coil which outputs an output AC voltage,
• a first switching element having a first element terminal connected to said first primary terminal,
• a second switching element having a first element terminal connected to said second primary terminal,
• a capacitor having a first capacitor terminal connected to a second element terminal of said first switching element, and a second capacitor terminal connected to a second element terminal of said second switching element,
• a first diode having a first diode terminal connected to said second primary terminal, and a second diode terminal connected to said second element terminal of said first switching element,
• a second diode having a first diode terminal connected to said second element terminal of said second switching element, and a second diode terminal connected to said first primary terminal,
• a choke coil having a first coil terminal connected to said first rectifier terminal, and a second coil terminal connected to said second primary terminal,
• a connection between said second rectifier terminal and said second element terminal of said second switching element, and
• an output rectifier for rectifying said output AC voltage from said secondary coil, for supplying an output DC voltage.

A power source comprising:

• an input rectifier for rectifying an AC input voltage and supplying an input DC voltage across a first rectifier terminal and a second rectifier terminal,
• a transformer having a primary coil with a first primary terminal and a second primary terminal, and a secondary coil which outputs an output AC voltage,
• a first switching element having a first element terminal connected to said first primary terminal,
• a second switching element having a first element terminal connected to said first primary terminal,
• a capacitor having a first capacitor terminal connected to a second element terminal of said first switching element, and a second capacitor terminal connected to a second element terminal of said second switching element,
• a first diode having a first diode terminal connected to said first primary terminal, and a second diode terminal connected to said second element terminal of said first switching element,
• a second diode having a first diode terminal connected to said second element terminal of said second switching element, and a second diode terminal connected to said first primary terminal,
• a dividing capacitance comprising a series connection of a first dividing capacitor and a second dividing capacitor, a first capacitance terminal of said dividing capacitance being connected to said second element terminal of said first switching element, a second capacitance terminal of said dividing capacitance being connected to said second element terminal of said second switching element, and a common capacitance terminal between said first dividing capacitor and said second dividing capacitor being connected to said second primary terminal,
• a choke coil having a first coil terminal connected to said first rectifier terminal, and a second coil terminal connected to said first primary terminal,
• a connection between said second rectifier terminal and said second element terminal of said second switching element, and
• an output rectifier for rectifying said output AC voltage from said secondary coil, for supplying an output DC voltage.

A power source comprising:

• an input rectifier for rectifying an AC input voltage and supplying an input DC voltage across a first rectifier terminal and a second rectifier terminal,
• a transformer having a primary coil with a first primary terminal and a second primary terminal, and a secondary coil which outputs an output AC voltage,
• a choke coil having a first coil terminal connected to said first rectifier terminal, and a second coil terminal connected to one of said first primary terminal and said second primary terminal,
• a capacitor element providing a capacitance across said first primary terminal and said second primary terminal,
• a switching element in the form of a single electronic component and being connected to said input rectifier, said transformer and said choke coil to provide both control of said output AC voltage across an output of said transformer and feed-back of energy from said transformer to said choke coil,
• a diode element in the form of a single electronic component and being connected to said input rectifier, said transformer and said choke coil to provide both supply of energy accumulated in said choke coil to said capacitor element and flywheel feed-back of energy from said transformer to said capacitor element, and
• an output rectifier for rectifying said output AC voltage from said secondary coil, for supplying an output DC voltage.