Inverted circuit overcurrent protection device and hybrid integrated circuit device with the same incorporated

• US 20030227730A1
• Filed: 04/24/2003
• Published: 12/11/2003
• Est. Priority Date: 04/24/2002
• 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 7,136,269 B2
• Time in Patent Office: Days
• US Class Current: 361/93.1
• CPC Class Codes: H02H 3/006 Calibration or setting of parameters
• CPC Class Codes: H02H 7/1222 responsive to abnormalities in the input circuit, e.g. transients in the DC input

Abstract

An inverter circuit overcurrent protection device in which an overcurrent detection resistor (Rs) is incorporated in a hybrid integrated circuit, in which a detection voltage from the overcurrent detection resistor (Rs) is divided by voltage dividing resistors (R₁ and R₂) and is compared with a reference voltage in an overcurrent detection circuit, for carrying out an overcurrent protection, and an external resistor is connected in series or in parallel with one of the voltage dividing resistors (R₁ and R₂) to change a division ratio so that the level of overcurrent protection can be adjusted; and an embodiment wherein, in the vicinity of a current detection terminal, a first pad (P1) is connected to a detection voltage from the overcurrent detection resistance, a second pad (P2) is connected to a detection voltage from the amplifier, and a third pad (P3) is connected to the voltage dividing resistors, and a bonding wire (10) is connected between the current detection terminal one of said pads, to select one of a plurality of overcurrent protection devices.

Claims

1. An inverter circuit overcurrent protection device comprising:

a plurality of switching elements,

a drive circuit for driving the switching elements;

,

a control circuit which generates a control signal to be inputted into the drive circuit to control a load,

an overcurrent detection resistor connected to said switching element,

an overcurrent detection circuit,

an external resistor; and

one or more voltage dividing resistors;

wherein said drive circuit, said switching element and said overcurrent detection resistor are incorporated in a single hybrid integrated circuit; and

wherein a detection voltage from said overcurrent detection resistor is divided by said voltage dividing resistors and is compared with a reference voltage in said overcurrent detection circuit, for carrying out an overcurrent protection, and said external resistor is connected with one of said voltage dividing resistors to change the division ratio so that the level of said overcurrent protection can be adjusted.

2. The inverter circuit overcurrent protection device of claim 1, wherein said voltage dividing resistors are also incorporated in said single hybrid integrated circuit.

3. The inverter circuit overcurrent protection device of claim 1 wherein said external resistor is connected in series with one of said voltage dividing resistors, and the overcurrent protection level is lowered by increasing a divided voltage to be inputted into said overcurrent detection circuit.

4. The inverter circuit overcurrent protection device of claim 1 wherein said external resistor is connected in parallel with one of said voltage dividing resistors, and the overcurrent protection level is raised by decreasing a divided voltage to be inputted into said overcurrent detection circuit.

5. An inverter circuit overcurrent protection device comprising:

a plurality of switching elements,

a drive circuit for driving the switching elements,

a control circuit which generates a control signal to be inputted into the drive circuit to control a load,

an overcurrent detection resistor,

a detection voltage amplifier,

voltage dividing resistors, and

an overcurrent detection circuit;

wherein said switching element, said drive circuit, said switching elements and said overcurrent detection resistor are incorporated in a single hybrid integrated circuit, and

wherein a detection voltage from said overcurrent detection resistor is amplified by said amplifier, is divided by said voltage dividing resistors, and is compared with a reference voltage in said overcurrent detection circuit, and said external resistor is connected with one of said voltage dividing resistors to change the division ratio so that the level of said overcurrent protection can be adjusted.

6. The inverter circuit overcurrent protection device of claim 5, wherein said voltage dividing resistors are also incorporated in said single hybrid integrated circuit.

7. The inverter circuit overcurrent protection device of claim 5, wherein said external resistor is connected in series with one of said voltage dividing resistors, and the overcurrent protection level is lowered by increasing a divided voltage to be inputted into said overcurrent detection circuit.

8. The inverter circuit overcurrent protection device of claim 5, wherein said external resistor is connected in parallel with one of said voltage dividing resistors, and the overcurrent protection level is raised by decreasing a divided voltage to be inputted into said overcurrent detection circuit.

9. A hybrid integrated circuit device with an overcurrent protection circuit, comprising:

a plurality of switching elements,

a drive circuit for driving the switching elements,

a control circuit which generates a control signal to be inputted into the drive circuit to control a load,

an overcurrent detection resistor connected to the switching elements,

a detection voltage amplifier,

voltage dividing resistors,

an overcurrent detection circuit which compares a divided detection voltage with a reference voltage for carrying out an overcurrent protection,

a hybrid integrated circuit comprising a plurality of connection pads, and

a current detection terminal;

wherein, in the vicinity of said current detection terminal, a first pad connected to receive a detection voltage from said overcurrent detection resistance, a second pad is connected to receive a detection voltage from said amplifier, and a third pad is connected to said voltage dividing resistors.

10. The device of claim 9 further comprising a bonding wire connection between said current detection terminal and one of said pads.

11. The hybrid integrated circuit device with an overcurrent protection circuit of claim 9, wherein

when said current detection terminal is connected via a bonding wire to the pad connected to a detection voltage from said overcurrent detection resistor, for use with a separate overcurrent detection circuit outside the hybrid integrated circuit device.

12. The device of claim 11 in combination with an overcurrent detection circuit outside the hybrid integrated circuit device.

13. The hybrid integrated circuit device with an overcurrent protection circuit of claim 9, wherein

when said current detection terminal is connected to the pad connected via a bonding wire to a detection voltage from said amplifier, for use with a separate overcurrent detection circuit provided outside the hybrid integrated circuit device.

14. The device of claim 13 in combination with an overcurrent detection circuit outside the hybrid integrated circuit device.

15. The hybrid integrated circuit device with an overcurrent protection circuit of claim 9, wherein

when said current detection terminal is connected via a bonding wire to said third pad connected to said voltage dividing resistors, an amplifier for amplifying a detection voltage from said overcurrent detection resistor incorporated into said hybrid integrated circuit device, voltage dividing resistors for dividing said detection voltage, and an overcurrent detection circuit which compares a divided detection voltage with a reference voltage for carrying out an overcurrent protection are used, and to said current detection terminal, an external resistor is connected in series with the voltage dividing resistors to change a division ratio so as to adjust an overcurrent protection level.