The present invention relates to a magnetic coupling and contactless power transmission apparatus. In one embodiment, an apparatus can include: a sweep generator to generate a switching pulse signal for operation of bottom switches of a primary-side full-bridge switching circuit; a primary-side switching current zero-crossing detector to generate a primary-side current zero-crossing pulse signal when a primary-side switching current crosses zero; a primary-side PWM signal generator to generate a primary-side PWM signal per an input current to control a shut-off operation of top switches of the primary-side full-bridge switching circuit; in a first operation condition, a frequency of the switching pulse signal is higher than the primary-side current zero-crossing pulse signal, and the switching pulse signal controls a shut-off operation of the bottom switches of the primary-side full-bridge switching circuit.