Patent ID: 9712038
Date: 2017-07-18
CPC Classifications: H01F,H02M,H03K

Claim:
1. An insulated power supply apparatus, which is applied to at least one power converter circuit including a plurality of series connections of an upper arm switching element and a lower arm switching element, comprising: upper arm transformers which have a primary side coil connectable to a DC power supply and a secondary side coil which supplies drive voltage to the upper arm switching element, and which are provided on a substrate so as to individually correspond to the upper arm switching elements; a lower arm transformer which has a primary side coil connectable to the DC power supply and a secondary side coil which supplies drive voltage to the lower arm switching element, and which is provided on the substrate; and at least one power supply control section which has at least one voltage control switching element which is turned on or off to apply voltage of the DC power supply to the primary side coils of the upper arm transformers and the lower arm transformer, and an integrated circuit which turns on or off the voltage control switching element, and which is provided on the substrate, wherein at least one of the upper arm transformers is provided so as to be adjacent to the power supply control section when viewing a surface of the substrate from a front thereof, the apparatus further comprises an electric path which connects a detection terminal of the integrated circuit and an output section for output voltage of the secondary side coil included in the transformer, which is included in the upper arm transformers and is provided so as to be adjacent to the power supply control section and whose distance to the detection terminal is the shortest when viewing the surface of the substrate from the front thereof, and the integrated circuit turns on or off the voltage control switching element to perform feedback control so that the output voltage detected via the electric path reaches a target voltage.