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

Patent metadata

Field	Value
Publication number	US-10673348-B2
Application number	US-201615764351-A
Country	US
Kind code	B2
Filing date	Aug 22, 2016
Priority date	Oct 19, 2015
Publication date	Jun 2, 2020
Grant date	Jun 2, 2020

Abstract

To improve the accuracy of detecting a current flowing through an electric compressor after operation of the electric compressor, the electric compressor having a large change in temperature before and after operation. An inverter-integrated electric compressor (1) that compresses and discharges a refrigerant suctioned therein, includes an inverter device (2) provided with a circuit board (60) mounted with an inverter circuit (40), the inverter device (2) being integrally incorporated in an inverter case. The circuit board (60) is provided with a current detection circuit (30) that detects an input current flowing through the inverter circuit (40), and an offset correction circuit (20). The current detection circuit (30) includes a shunt resistor (32) that is serially connected to the inverter circuit (40) and detects a current, and a first amplifier (31) that amplifies and outputs a voltage appearing as a voltage drop in the shunt resistor (32). The offset correction circuit (20) includes a second amplifier (21) that performs an offset correction of the first amplifier (31). The first amplifier (31) and the second amplifier (21) are integrated into a single integrated circuit.

First claim

The invention claimed is:

1. An inverter-integrated electric compressor that compresses and discharges a refrigerant suctioned into the inverter-integrated electric compressor, the inverter-integrated electric compressor comprising:
an inverter device provided with a circuit board mounted with an inverter circuit, the inverter device being integrally incorporated in an inverter housing portion;
the circuit board comprising:
a current detection circuit that comprises 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.

2. The inverter-integrated electric compressor according to claim 1 , wherein:
the first amplifier, the second amplifier, the resistor included in the first peripheral component, and the resistor included in the second peripheral component of the current detection circuit and the offset correction circuit are mounted on a same plane of the circuit board and provided to a same ground plane.

3. 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.

4. 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.

Assignees

• Mitsubishi Heavy Ind Thermal Systems Ltd

Inventors

• Ito Masato
• Aiba Kenichi
• Nakagami Takashi
• Watanabe Kyohei
• Nishikawa Naoki
• Saito Katsuhiro
• Shimizu Kenji

Classifications

• H02M2001/0009

  Electricity · mapped topic

• H02M7/003 Primary

  Constructional details, e.g. physical layout, assembly, wiring or busbar connections · CPC title

• F04C29/047 Primary

  Cooling of electronic devices installed inside the pump housing, e.g. inverters · CPC title

• H02M1/0009

  Devices or circuits for detecting current in a converter · CPC title

• F04C2240/40

  Electric motor · CPC title