Apparatus and method for detecting overcurrent in inverter

Abstract

An apparatus for sensing an overcurrent is provided. The apparatus for sensing an overcurrent includes an inverter converting a direct current (DC) into an alternating current (AC) and supplying the AC to a motor to allow the motor to operate; a current sensing unit provided on a connection between the inverter and the motor and measuring an overcurrent of a control current value output from the inverter; and a control unit checking with the current sensing unit whether the overcurrent is sensed, and determining whether to operate the inverter, wherein the control unit creating an interrupt service routine (ISR) for checking overcurrent information and checks the overcurrent information according to a created ISR, when the overcurrent is sensed through the current sensing unit.

Description

Technical field [0001] The present disclosure relates to an apparatus and method for detecting overcurrent in an inverter. Background technique [0002] Generally, a system to which a device such as an electric motor is applied often experiences overcurrent due to blockage (fault) or overload. [0003] In the case of a system that uses a weak current less than or equal to 3A, a normal current limiting circuit can prevent the overcurrent when the overcurrent rises. However, in the case of a device in which the instantaneous drive current rises to 10A or more, such as a brushless DC motor of an automated teller machine, a typical current limit circuit cannot cope with the instantaneous current rise, and therefore may damage the device driver. [0004] Moreover, since a typical current limit circuit uses an analog method, it will generate heat accumulation depending on the current flowing in the current limit circuit. When the current flowing in the current limiting circuit fluctuates...

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Problems solved by technology

However, in the case of devices where the momentary drive current rises to 10A or more, such as a brushless DC motor for an automated teller machine, typical current limiting circuits cannot cope with the momentary current rise and thus may damage the device driver

[0004] Also, since a typical current limiting circuit uses an analog method, depending on the current flowing in the current limiting circuit, there will be a build-up of heat

When the current flowing in the current limiting circuit fluctuates between current threshold values ​​at very short time intervals, disconnection and connection operations of the circuit are repeatedly performed, whereby there is a defect that heat due to overcurrent is accumulated and the device driver is corrupted

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