Patent ID: 8288894
Filing Date: 2012-10-16
Classification: H01L,H04L

Abstract:
1. A power electronics equipment comprising: a switching device for making a current flow to a load or interrupting the current flowing to the load, said switching device having control terminals; a control circuit generating a control signal directing conduction and non-conduction of the switching device; a driver circuit for driving the control terminals of the switching device based on the control signal; and at least one air-cored insulating transformer insulating the control circuit from the driver circuit, each transformer comprising a primary winding generating a magnetic field and a secondary winding on a receiver side generating a voltage by a change of interlinkage of the magnetic field; wherein when the control circuit transmits the control signal to the switching device, the current flows through the primary winding of the transformer to create a signal magnetic flux, the secondary winding comprises a first secondary coil and a second secondary coil arranged adjacent to each other configured such that voltages generated by external magnetic flux intersecting the secondary winding are canceled and a voltage generated by the signal magnetic flux intersecting the secondary winding is increased, a winding direction of the first secondary coil is the same as a winding direction of the second secondary coil, the primary winding and the first secondary coil are arranged in a coaxial relationship, and the first secondary coil and the second secondary coil each comprises a head and a tail in which the head of the first secondary coil is connected to the head of the second secondary coil or the tail of the first secondary coil is connected to the tail of the second secondary coil.