Switching power supply unit
First Claim
1. A switching power supply unit converting a DC input voltage inputted from an input terminal pair into a DC output voltage, and outputting the generated DC output voltage from an output terminal pair, the switching power supply unit comprising:
- a transformer having a primary winding arranged on the input terminal pair side and a first and a second secondary windings arranged on the output terminal pair side, the first and a second secondary windings being connected in series to each other;
an inverter circuit arranged between the input terminal pair and the primary winding, and including switching elements; and
a rectifying-smoothing circuit arranged between the output terminal pair and the first and second secondary windings, and including first and second rectifying elements, first to third choke coils, and a capacitive element arranged between the output terminal pair;
whereinthe first rectifying element is arranged between a first junction and one end of the capacitive element, the first junction being defined as a junction of one end of the first secondary winding and one end of the second choke coil;
the second rectifying element is arranged between a second junction and the one end of the capacitive element, the second junction being defined as a junction of one end of the second secondary winding and one end of the third choke coil;
a third junction is connected to the one end of the first choke coil, the third junction being defined as a junction of the other end of the first secondary winding and the other end of second secondary winding; and
a fourth junction is connected to the other end of the capacitive element, the fourth junction being defined as a junction of the other end of the first choke coil, the other end of the second choke coil and the other end of the third choke coil.
1 Assignment
0 Petitions
Accused Products
Abstract
The switching power supply unit includes: a transformer having a primary winding and two secondary windings; and a rectifying-smoothing circuit having two rectifying elements, three choke coils and a capacitive element. A first rectifying element is between a junction of ends of the first secondary winding and the second choke coil, and one end of the capacitive element. A second rectifying element is between a junction of ends of the second secondary winding and the third choke coil, and the one end of the capacitive element. The other end of the first secondary winding and the other end of second secondary winding are connected to the one end of the first choke coil. The other end of the first choke coil, the other end of the second choke coil, and the other end of the third choke coil are connected to the other end of the capacitive element.
32 Citations
12 Claims
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1. A switching power supply unit converting a DC input voltage inputted from an input terminal pair into a DC output voltage, and outputting the generated DC output voltage from an output terminal pair, the switching power supply unit comprising:
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a transformer having a primary winding arranged on the input terminal pair side and a first and a second secondary windings arranged on the output terminal pair side, the first and a second secondary windings being connected in series to each other; an inverter circuit arranged between the input terminal pair and the primary winding, and including switching elements; and a rectifying-smoothing circuit arranged between the output terminal pair and the first and second secondary windings, and including first and second rectifying elements, first to third choke coils, and a capacitive element arranged between the output terminal pair; wherein the first rectifying element is arranged between a first junction and one end of the capacitive element, the first junction being defined as a junction of one end of the first secondary winding and one end of the second choke coil; the second rectifying element is arranged between a second junction and the one end of the capacitive element, the second junction being defined as a junction of one end of the second secondary winding and one end of the third choke coil; a third junction is connected to the one end of the first choke coil, the third junction being defined as a junction of the other end of the first secondary winding and the other end of second secondary winding; and a fourth junction is connected to the other end of the capacitive element, the fourth junction being defined as a junction of the other end of the first choke coil, the other end of the second choke coil and the other end of the third choke coil. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A switching power supply unit converting a DC input voltage inputted from an input terminal pair into a DC output voltage, and outputting the generated DC output voltage from an output terminal pair, the switching power supply unit comprising:
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a transformer having a primary winding arranged on the input terminal pair side and first to fourth secondary windings arranged on the output terminal pair side, the first to fourth secondary windings being connected in series to each other; an inverter circuit arranged between the input terminal pair and the primary winding, and including switching elements; and a first rectifying-smoothing circuit arranged between the output terminal pair and the first and second secondary windings, and including first and second rectifying elements, first to third choke coils, and a first capacitive element arranged between the output terminal pair; and a second rectifying-smoothing circuit arranged between the output terminal pair and the third and fourth secondary windings in parallel with the first rectifying-smoothing circuit, and including third and fourth rectifying elements, fourth to sixth choke coils, and a second capacitive element arranged between the output terminal pair; wherein the first rectifying element is arranged between a first junction and one end of the capacitive element, the first junction being defined as a junction of one end of the first secondary winding and one end of the second choke coil, the second rectifying element is arranged between a second junction and the one end of the capacitive element, the second junction being defined as a junction of one end of the second secondary winding and one end of the third choke coil, a third junction is connected to the one end of the first choke coil, the third junction being defined as a junction of the other end of the first secondary winding and the other end of second secondary winding, a fourth junction is connected to the other end of the capacitive element, the fourth junction being defined as a junction of the other end of the first choke coil, the other end of the second choke coil and the other end of the third choke coil, the third rectifying element is arranged between a fifth junction and one end of the second capacitive element, the fifth junction being defined as a junction of one end of the third secondary winding and one end of the fifth choke coil, the fourth rectifying element is arranged between a sixth junction and the one end of the second capacitive element, the sixth junction being defined as a junction of one end of the fourth secondary winding and one end of the sixth choke coil, a seventh junction is connected to the one end of the fourth choke coil, the seventh junction being defined as a junction of the other end of the third secondary winding and the other end of fourth secondary winding, and an eighth junction is connected to the other end of the first capacitive element, the eighth junction being defined as a junction of the other end of the fourth choke coil, the other end of the fifth choke coil and the other end of the sixth choke coil. - View Dependent Claims (11, 12)
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Specification