Insulated power supply apparatus applied to power converter circuit including series connections of upper and lower arm switching elements

Patent metadata

Field	Value
Publication number	US-9712038-B2
Application number	US-201414495240-A
Country	US
Kind code	B2
Filing date	Sep 24, 2014
Priority date	Sep 24, 2013
Publication date	Jul 18, 2017
Grant date	Jul 18, 2017

Abstract

An insulated power supply apparatus includes an upper arm transformer which has a primary side coil and a secondary side coil, a lower arm transformer which has a primary side coil and a secondary side coil, and a power supply control section which has a voltage control switching element and an integrated circuit which turns on or off the voltage control switching element. At least one of the upper arm transformer and the lower arm transformer is adjacent to the power supply control section when viewing a surface of the substrate from a front thereof. An electric path transfers output voltage of the secondary side coil of the transformer adjacent to the power supply control section, to the integrated circuit. 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.

First claim

What is claimed is:

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.

2. The insulated power supply apparatus according to claim 1 , wherein
the power converter circuit includes a parallel connection of the series connections,
the apparatus further comprises:
a plurality of upper arm connection sections which connect the upper arm switching elements to the substrate and which are provided on the substrate so as to be arranged in line, when viewing the surface of the substrate from the front thereof; and
a plurality of lower arm connection sections which connect the lower arm switching elements to the substrate and which are provided on the substrate so as to be arranged in line and in a direction in which the upper arm connection sections are arranged, when viewing the surface of the substrate from the front thereof.

3. The insulated power supply apparatus according to claim 2 , wherein
the power supply control sections are provided so as to individually correspond to groups of the power converter circuits,
the upper arm connection sections are provided on the substrate so as to adjacent to the lower arm connection sections when viewing the surface of the substrate from the front thereof,
a first target control section which is at least one of the power supply control sections is provided at a side opposed to the lower arm connection sections corresponding to the first target control section with respect to the upper arm connection sections corresponding to the first target control section, when viewing the surface of the substrate from the front thereof, and
the upper arm transformers corresponding to the first target control section are provided, in an area sandwiched between the first target control section and the upper arm connection sections corresponding to the first target control section, so as to be adjacent to the first target control section, and in a direction in which the upper arm connection sections corresponding to the first target control section are arranged, and so as to be in line, when viewing the surface of the substrate from the front thereof.

4. The insulated power supply apparatus according to claim 2 , wherein
the power supply control sections are provided so as to individually correspond to groups of the power converter circuits,
the upper arm connection sections are provided on the substrate so as to be adjacent to the lower arm connection sections, when viewing the surface of the substrate from the front thereof,
the upper arm transformers corresponding to a second target control section which is at least one of the power supply control sections are provided, in a direction in which the upper arm connection sections corresponding to the second target control section are arranged, so as to be in line, when viewing the surface of the substrate from the front thereof, and
the second target control section is provided in an area which is sandwiched between the transformer, which is included in the upper arm transformers corresponding to the second target control section and which is closest to one side of the substrate positioned in a direction in which the upper arm connection sections are arranged, and the one side, when viewing the surface of the substrate from the front thereof.

5. The insulated power supply apparatus according to claim 1 , wherein
the primary side coils configuring the upper arm transformers and the lower arm transformer are connected in parallel.

6. The insulated power supply apparatus according to claim 1 , wherein
the DC power supply is a storage battery.

7. The insulated power supply apparatus according to claim 1 , wherein
the integrated circuit includes a forced operation means which, if the output voltage detected via the electric path exceeds a specified voltage, operates the voltage control switching element so as to forcibly stop supplying voltage from the DC power supply to the primary side coils configuring the upper arm transformers and the lower arm transformer.

8. The insulated power supply apparatus according to claim 1 , wherein
the primary side coils configuring the upper arm transformers and the lower arm transformer are connected in parallel,
the voltage control switching element is provided so as to form a closed circuit including the DC power supply, the parallel connection of the primary side coils, and the voltage control switching element, when the voltage control switching element is turned on.

9. The insulated power supply apparatus according to claim 1 , wherein
each of the primary side coils and the secondary side coils configuring the upper arm transformer and the lower arm transformers are provided with an insulation film,
each of the primary side coils and the secondary side coils is wound around a bobbin attached to a core configuring each of the upper arm transformer and the lower arm transformer, so as to be laminated.

10. The insulated power supply apparatus according to claim 1 , wherein
the lower arm transformer is common to the lower arm switching elements and includes the common secondary side coil which applies the drive voltage to the lower arm switching elements, and
a turn ratio of the secondary side coil to the primary side coil configuring the lower arm transformer is larger than a turn ratio of the secondary side coil to the primary side coil configuring the upper arm transformer.

11. The insulated power supply apparatus according to claim 1 , wherein
the core configuring the transformer which is a target of detection of output voltage via the electric path and is included in the upper arm transformers, and the core configuring at least one of the other upper arm transformers have the same shape.

12. The insulated power supply apparatus according to claim 11 , wherein
the number of turns of th

Assignees

• Denso Corp

Inventors

• Miyauchi Syun
• Maebara Tsuneo
• Shindo Yusuke
• Fukuta Junichi

Classifications

• H01F30/10

  Single-phase transformers (H01F30/16 takes precedence) · CPC title

• H02M2001/0006

  Electricity · mapped topic

• H02M3/33523

  with galvanic isolation between input and output of both the power stage and the feedback loop · CPC title

• H02M1/084 Primary

  using a control circuit common to several phases of a multi-phase system · CPC title

• H03K17/691

  using transformer coupling · CPC title