Power conversion device using PCB's

A power conversion device comprising:

• a casing to include a first inner surface and a second inner surface and being configured with the first inner surface and the second inner surface intersecting with each other;
• a first printed board fixed to the first inner surface of the casing;
• a second printed board fixed to the second inner surface;
• and
• a control circuit board disposed along the second printed board,
• wherein the control circuit board includes circuit wiring and a shield pattern opposite to the circuit wiring in a layer different from the circuit wiring, and
• the shield pattern at least partially overlaps the circuit wiring when viewed from an opposite direction in which the shield pattern is opposite to the circuit wiring.

A power conversion device comprising:

• a casing
• to include at least a first inner surface and a second inner surface;
• an
• electronic component to include a first component and a second component;
• a
• first printed board to include a first main surface on which the first component of the electronic component is mounted, and a second main surface opposite to the first main surface;
• a second printed board to include a third main surface on which the second component of the electronic component is mounted, and a fourth main surface opposite to the third main surface;
• and
• a control circuit board,
• wherein the second main surface of the first printed board is thermally connected to the first inner surface,
• the fourth main surface of the second printed board is thermally connected to the second inner surface,
• the second printed board extends in a direction from the second main surface toward the first main surface of the first printed board,
• the control circuit board is disposed along the second inner surface, and includes circuit wiring and a shield pattern opposite to the circuit wiring in a layer different from the circuit wiring, and
• the shield pattern at least partially overlaps the circuit wiring when viewed from an opposite direction in which the shield pattern is opposite to the circuit wiring.