| 摘要 |
Provided is a vehicle which enables a highly-efficient DC-DC converter and a highly-efficient power supply to a load, regardless of a power supply amount of to the load. When the power supply amount to a load R1 is a predetermined value or more, a control means 5 implements a first mode for making the switching elements S1 to S4 driven, and when the power supply amount of to the load R1 is the predetermined value or less, the control means 5 implements a second mode, for making the switching elements S3 and S4 stopped in an OFF state, and making only the switching elements S1 and S2 driven. |
| 主权项 |
1. A DC-DC converter, comprising:
a full bridge circuit, composed of a first switching leg connecting a first and a second switching elements in series, and a second switching leg connecting a third and a fourth switching elements in series, the first and second switching legs being connected in parallel, wherein DC terminals are provided between both ends of the first switching leg and between both ends of the second switching leg, and AC terminals are provided between the series connecting point of the first and the second switching elements, and the series connecting point of the third and the fourth switching elements; a rectifier circuit having a smoothing reactor; a first smoothing capacitor connected to a DC power source in parallel and connected to the DC terminals of the full bridge circuit; a second smoothing capacitor connected to a load in parallel, and connected to a DC terminals of the rectifier circuit; a primary winding connected to the AC terminals of the full bridge circuit; a secondary winding connected to an AC terminals of the rectifier circuit; a transformer for connecting magnetically the primary winding and the secondary winding; and a control means for controlling the full bridge circuit, wherein the first, second, third and fourth switching elements are each composed of a switch, an antiparallel diode connected to the switch in parallel, and a capacitor connected to the switch and the antiparallel diode in parallel, the DC-DC converter having a reactor component inserted between the AC terminals and the primary winding of the full bridge circuit in series; when power supply amount to the load is predetermined value or more, the control means implements a first mode for making the first, the second, the third and the fourth switching elements driven; and when power supply amount to the load is predetermined value or less, the control means implements a second mode for making one set of the switching elements of the switching leg at one side composing the first switching leg and the second switching leg stopped, in an OFF state, and for making one set of the switching elements of the switching leg at the other side composing the first switching leg and the second switching leg driven. |
