An overcurrent protection detection circuit applied to a high-power motor driver chip

Abstract

The invention discloses an overcurrent protection detection circuit applied to a high-power motor drive chip, comprising a MOSFET tube MI, a current sampling tube MII, a voltage comparator VC, a MOS tube M6 and a current comparator IC. The source of the MOSFET MI and the source of the power sampling tube MII are connected to the motor power supply voltage VBB, the gate of the MOSFET MI and the gate of the power sampling tube MII are connected together, and the drain of the MOSFET MI is connected to the power sampling tube MII The drains of the voltage comparator VC are respectively connected to the two input terminals of the voltage comparator VC, and the output terminal of the voltage comparator VC is connected to the input terminal of the current comparator IC, and are compared with the reference current Iref in the current comparator IC, and are performed according to the comparison result Maximum peak output current protection in motor current charging mode.

Description

technical field [0001] The invention relates to an overcurrent protection detection circuit for a motor drive chip, in particular to an overcurrent protection detection circuit for a high voltage and high power motor drive chip. Background technique [0002] In the application of electrode drive, in order to increase the output power of the motor, the current flowing through the motor coil of the motor is required to be large enough, which requires the drive circuit of the motor to have sufficient drive capability to provide sufficient drive current for the motor. While increasing the drive current, attention should also be paid to the safe operating current limit of the motor, which limits the overload current of the circuit, so it is necessary to monitor the peak current passing through the motor; inside the drive circuit, design an overcurrent The protection module synchronously detects the rising current flowing through the motor, and sets a safe working threshold, so th...

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Problems solved by technology

[0003] The rated current required by the motor of the motor is usually large, generally greater than 1A. Too much current is not easy to handle, and the technology is very difficult.

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