초록 ▼

A power transfer device includes a first current transferring section connected between a first AC power source and a load, a second current transferring section with first and second switches which have opposite conduction directions, connected in parallel, and connected between a second AC power s

A power transfer device includes a first current transferring section connected between a first AC power source and a load, a second current transferring section with first and second switches which have opposite conduction directions, connected in parallel, and connected between a second AC power source and the load; a current detector for detecting a current flowing from the first AC power source to the load; a generator for generating a power transfer signal instructing transfer from the first AC power source to the second AC power source; a current direction estimator for estimating the direction of a current which flows from the first AC power source to the load when the second current transferring section enters the conduction state after a time period; and a conduction signal generator for causing one of the first and second switches to be conductive, so that the current flowing from the first AC power source to the load is cancelled, and, thereafter, causing the other of the first and second switches to be conductive.

대표청구항 ▼

1. A power transfer device comprising:a first current transferring section connected between a first AC power source and a load, the first current transferring section switching current flow from the first AC power source to the load; a second current transferring section connected between a second

1. A power transfer device comprising:a first current transferring section connected between a first AC power source and a load, the first current transferring section switching current flow from the first AC power source to the load; a second current transferring section connected between a second AC power source and the load, the second current transferring section switching current flow from the second AC power supply to the load, the second current transferring section including first and second switches having respective current conducting directions, and connected in parallel and in reverse polarity; a current detector for detecting a current flow from the first AC power source to the load, the current detector outputting a detection signal; a power transfer signal generator for generating a power transfer signal for transfer of the load from the first AC power source to the second AC power source, the power transfer signal setting the first current transferring section to stop current flow from the first AC power source; a current direction estimator, responsive to the power transfer signal and the detection signal, estimating direction of a remaining current flow from the first AC power source to the load at a time when the second current transferring section first begins supplying current from the second power source by closing one of the first and second switches; and a conduction signal generator, responsive to the direction of the remaining current flow estimated by the current direction estimator, first closing the one of the first and second switches that supplies a current from the second AC power source that cancels the remaining current then flowing from the first AC power source to the load, and, thereafter, closing the other of the first and second switches to, whereby current flow through the first current transferring section is rapidly extinguished and the first and second AC power sources are not short-circuited during switching.