Power factor improvement circuit
AssigneeTDK Corporation
InventorYueQing WANG
Life of this patent
Estimating the term…
Abstract
A power factor improvement circuit is configured with two series circuits each having a switching element and a rectifying element connected in series. Two input terminals of a single-phase AC power source are respectively connected between the switching elements and the rectifying elements in the series circuits. An inductor element is connected between an output terminal of the power factor improvement circuit and two terminals, which are on the other side of the rectifying elements, of the switching elements. A capacitor element is connected between the output terminal and the two terminals. According to the above configuration, it is possible to decrease a loss of a bridge circuit and common-mode noise, and to provide a power factor improvement circuit in a smaller size.
Claims13
A power factor improvement circuit, comprising:
- a first series circuit in which a first switching element and a first rectifying element are serially connected;
- a second series circuit in which a second switching element and a second rectifying element are serially connected;
- a single-phase alternating current power source that has first and second input terminals, the first input terminal being connected to a first node between the first switching element and the first rectifying element, the second input terminal being connected to a second node between the second switching element and the second rectifying element;
- an inductor element that is connected between a terminal of the first switching element and a terminal of the second switching element, the terminal of the first switching element being on the other side of the first node, and the terminal of the second switching element being on the other side of the second node;
- a third rectifying element that is connected between the terminal of the first switching element and an output terminal;
- a fourth rectifying element that is connected between the terminal of the second switching element and the output terminal;
- and
- a first capacitor element that is connected between a terminal of the first rectifying element and the output terminal, the first capacitor also being connected between a terminal of the second rectifying element and the output terminal, the terminal of the first rectifying element being on the other side of the first node, and the terminal of the second rectifying element being on the other side of the second node.
A power factor improvement circuit, comprising:
- a first circuit;
- and
- at least one other circuit that is connected in parallel to the first circuit, each of the first circuit and the at least one other circuit including:
- a first series circuit in which a first switching element and a first rectifying element are serially connected;
- a second series circuit in which a second switching element and a second rectifying element are serially connected;
- a single-phase alternating current power source that has first and second input terminals, the first input terminal being connected to a first node between the first switching element and the first rectifying element, the second input terminal being connected to a second node between the second switching element and the second rectifying element;
- an inductor element that is connected between a terminal of the first switching element and a terminal of the second switching element, the terminal of the first switching element being on the other side of the first node, and the terminal of the second switching element being on the other side of the second node;
- a third rectifying element that is connected between the terminal of the first switching element and an output terminal;
- a fourth rectifying element that is connected between the terminal of the second switching element and the output terminal;
- and
- a first capacitor element that is connected between a terminal of the first rectifying element and the output, the first capacitor also being connected between a terminal of the second rectifying element and the output, the terminal of the first rectifying element being on the other side of the first node, and the terminal of the second rectifying element being on the other side of the second node.
Dependencies are inferred from the claim text.