Patent ID: 6967527

Claim:
A pulse width modulation amplifier which supplies to a load circuit an amplified output having been subjected to a pulse width modulation, comprising: a first series circuit including a first switching element connected to a positive pole side of a first direct-current power source, and a second switching element, one end of said load circuit being connected to a connecting point between said first switching element and said second switching element, a second series circuit including a third switching element connected to a positive pole side of a second direct-current power source, and a fourth switching element, the other end of said load circuit being connected to a connecting point between said third switching element and said fourth switching element, and a driving circuit which turns on a set of said first switching element and said fourth switching element, and a set of said second switching element and said third switching element, set-by-set, each of said sets being alternately put into on-state.