Inverter circuit device with temperature detection circuit

• US 20040008457A1
• Filed: 06/30/2003
• Published: 01/15/2004
• Est. Priority Date: 07/04/2002
• Status: Active Grant

• Current Assignee: Semiconductor Components Industries LLC (ON Semiconductor Corporation)
• Original Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Inventors: Koike, Yasuhiro, Iimura, Junichi, Izutani, Soichi, Okawa, Katsumi
• Granted Patent: US 7,075,762 B2
• Time in Patent Office: Days
• US Class Current: 361/18
• CPC Class Codes: H02H 5/041 additionally responsive to excess current H02H5/048 takes precedence
• CPC Class Codes: H02H 5/042 using temperature dependent resistors
• CPC Class Codes: H02H 7/122 for inverters, i.e. dc/ac converters

Abstract

In order to enable overheat protection and overcurrent protection as well as temperature detection of an inverter circuit, an inverter circuit comprises a switching circuit 9 composed of a plurality of switching elements and a control circuit 1 for generating a control signal to be inputted into a drive circuit 2 to control a load, a temperature detecting element 12 for detecting a change in temperature of the inverter circuit is provided in a temperature detection circuit 10, and a temperature detection signal which changes according to a change in temperature of said inverter circuit, an overheat abnormal signal outputted upon a rise in temperature to a predetermined temperature or more, and an overcurrent abnormal signal outputted from an overcurrent protection FET 13 are outputted via one commonly used terminal.

Claims

1. An inverter circuit device with a temperature detection circuit comprising:

a switching circuit composed of a plurality of switching elements;

a drive circuit for driving said switching elements; and

a protection circuit which stops driving of said drive circuit and outputs an abnormal signal in regard to an overcurrent abnormality, wherein

a temperature detection circuit with a temperature detecting element is provided in said inverter circuit, and a temperature detection signal detected by said temperature detecting element and an abnormal signal from said protection circuit are outputted to a common terminal.

3. The inverter circuit device with a temperature detection circuit as set forth in claim 1 or claim 2, wherein

said inverter circuit and temperature detecting element are attached to the same heat sink print board.

4. The inverter circuit device with a temperature detection circuit as set forth in claim 3, wherein

said heat sink print board is an aluminum substrate on whose surface an oxide film is formed.

2. An inverter circuit device with a temperature detection circuit comprising:

a switching circuit composed of a plurality of switching elements;

a drive circuit for driving said switching elements; and

a protection circuit which stops driving of said drive circuit and outputs an abnormal signal in regard to an overcurrent abnormality, wherein

a temperature detection circuit with a temperature detecting element for detecting a change in temperature of said inverter circuit is provided, a temperature detection signal which changes according to a change in temperature of said inverter circuit is applied to a control circuit to change an electric current which flows through the inverter circuit according to a change in temperature, and an overheat abnormal signal which is generated from an overheat detection circuit when said inverter circuit is made a predetermined temperature or more is applied to said control circuit to stop operation of the inverter circuit.