The contactless power supply

1. The contactless supply of power for transmission of electrical energy from the first coil to a second coil in a contactless manner by means of at least a magnetic coupling, comprising: - energy transfer circuit including a first coil, - a sensor adapted to measure the current flowing through energy transfer circuit, or to measure a voltage applied to the power transmission circuit, - means for estimating the energy transfer efficiency for estimating the energy transfer efficiency from the first coil to a second coil on a regular ove particular sensor value - battery, which vehicle power source; and a charge circuit including a second coil and charge - charge circuit including a second coil and charge the battery; u determining means for determining that the positional deviation between the first coil and the second coil falls within a range in which the battery can be charged if the power transmission efficiency, estimated by estimating the energy transfer efficiency means higher predetermined znacheniya.2. The contactless power supply according to Claim. 1 further comprising switching means connected between the battery and the charging circuit, and the switching means is in the OFF state during vehicle travel sredstva.3. The contactless power supply according to Claim. 1, wherein the estimating means estimates the energy transmission efficiency of energy transfer efficiency during vehicle travel sredstva.4. The contactless power feeding