Wide input voltage range power supply with auto-transformers and piezoelectric transformer
AssigneeNEC Corporation
InventorYasuhei Shimada
Life of this patent
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Abstract
N-channel enhancement type switching transistors complementarily turn on and off in response to pulse signals complementary to each other so as to cause two auto-transformers to alternately supply secondary potentials to primary electrodes of a piezoelectric transformer, and the piezoelectric transformer supplies an alternating current signal to a load; the primary winding portion of each auto-transformer is dually used in the accumulation of current energy and the resonating phenomenon for generating the secondary potential, and, for this reason, the auto-transformers make the driving circuit for the load compact.
Claims4
A driving circuit for a load comprising:
- a first auto-transformer including a first winding having a first node splitting said first winding into a first primary winding portion connected to a power source and a first secondary winding portion;
- a second auto-transformer including a second winding having a second node splitting said second winding into a second primary winding portion connected to said power source and a second secondary winding portion;
- a first switching transistor including a first control node and a first current path connected between said first node and a constant voltage source;
- a second switching transistor including a second control node and a second current path connected between said second node and said constant voltage source;
- a piezoelectric transformer including primary electrodes respectively connected to said first secondary winding portion and said second secondary winding portion, and a secondary electrode connected to said load;
- and
- a pulse generating means for supplying a first pulse signal and a second pulse signal complementary to said first pulse signal to said first control node and said second control node, respectively.
Dependencies are inferred from the claim text.