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US 5,850,335 AGranted
Isolation-type switching power supply
AssigneeToko, Inc.
InventorTetushi Otake
Life of this patent
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AssigneeToko, Inc.
InventorTetushi Otake
Estimating the term…
A low-cost and highly reliable flyback isolation-type switching power supply comprises a main transformer and an auxiliary transformer. A secondary winding of the main transformer is connected in parallel with an input winding of the auxiliary transformer. A series network of a diode and a capacitor is connected between the terminals of an output winding of the auxiliary transformer, and a voltage corresponding to the output voltage of the power supply is obtained across the capacitor. The main transformer and the auxiliary transformer preferably share a core having a plurality of bobbin sections, with the windings of each transformer wound around respective different bobbin sections. The equivalent degree of coupling between the secondary winding and the output winding is thus sufficiently larger than the degree of coupling between the primary winding and the output winding.
An isolation-type switching power supply comprising:
An isolation-type switching power supply comprising:
An isolation-type switching power supply comprising a transformer having a primary winding and a secondary winding, and a switching element connected in series with the primary winding and turned on and off to induce a voltage in the secondary winding so that a dc output voltage is obtained by rectifying the voltage appearing in the secondary winding, the transformer comprising a core having a plurality of bobbin sections thereon with the magnetic path of the core decoupled at a partition between the bobbin sections, wherein part of the primary winding, the secondary winding and a tertiary winding are wound around one of the bobbin sections of the core and the remainder of the primary winding is wound around the other bobbin section, and wherein a dc voltage signal that is obtained by rectifying a voltage appearing in the tertiary winding is used as a feedback signal for on-duty control of the switching element.
Dependencies are inferred from the claim text.