Inverter-integrated electric compressor and circuit board, and method for manufacturing circuit board

A circuit board integrally incorporated as an inverter device in an inverter housing portion of an inverter-integrated electric compressor that compresses and discharges suctioned refrigerant, the circuit board comprising:

• an inverter circuit mounted on the circuit board;
• a current detection circuit, comprising:
• a current detection resistor serially connected to the inverter circuit and detects a current, and a first amplifier that amplifies and outputs a voltage appearing as a voltage drop in the current detection resistor, the current detection circuit detecting an input current flowing through the inverter circuit;
• and
• an offset correction circuit comprising a second amplifier that performs an offset correction of the first amplifier;
• the first amplifier and the second amplifier being integrated into a single integrated circuit,
• wherein:
• the current detection circuit further comprises a first peripheral component for adjusting a value of the first amplifier;
• and
• the offset correction circuit further comprises a second peripheral component for adjusting a value of the second amplifier;
• the first peripheral component of the current detection circuit and the second peripheral component of the offset correction circuit each comprising a resistor from a same lot in a manufacturing stage.

A method for manufacturing a circuit board integrally incorporated as an inverter device in an inverter housing portion of an inverter-integrated electric compressor that compresses and discharges a refrigerant suctioned into the inverter-integrated electric compressor, the method comprising the steps of:

• mounting an inverter circuit;
• and
• integrating a first amplifier of a current detection circuit that amplifies and outputs a voltage appearing as a voltage drop in a current detection resistor serially connected to the inverter circuit and detects a current, and a second amplifier of an offset correction circuit that performs offset correction of the first amplifier into a single integrated circuit;
• the current detection circuit comprising a first peripheral component for adjusting a value of the first amplifier;
• the offset correction circuit comprising a second peripheral component for adjusting a value of the second amplifier;
• and
• the first peripheral component of the current detection circuit and the second peripheral component of the offset correction circuit each comprising a resistor from a same lot in a manufacturing stage.