Overcurrent protection detection circuit applied to high-power motor drive chips

A technology of motor drive chip and overcurrent protection, which is applied in the direction of overcurrent protection, current/voltage measurement, and measurement devices, etc. It can solve the problems of difficult current handling, high technical difficulty, and large rated current.

Active Publication Date: 2014-03-12
JIAXING ZHONGRUN MICROELECTRONICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The rated current required by the motor of the motor is usually large, generally gre

Method used

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  • Overcurrent protection detection circuit applied to high-power motor drive chips
  • Overcurrent protection detection circuit applied to high-power motor drive chips
  • Overcurrent protection detection circuit applied to high-power motor drive chips

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Embodiment Construction

[0036] Below in conjunction with accompanying drawing, the embodiment of the present invention is described in detail: present embodiment implements under the premise of the technical scheme of the present invention, has provided detailed implementation and specific operation process, but protection scope of the present invention is not limited to the following the embodiment.

[0037] Such as figure 1 As shown, an overcurrent protection detection circuit applied to a high-power motor drive chip of the present invention includes a MOSFET MI, a current sampling tube MII, a MOS tube M6, a current source Itrip, a voltage comparator VC and a current comparator IC.

[0038] The source of the MOSFET MI is connected to the motor power supply voltage VBB, the gate is connected to the gate of the current sampling transistor MII, and the drain is respectively connected to the negative phase input terminal of the voltage comparator VC and the input terminal of the current source Itrip. ...

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Abstract

The invention discloses an overcurrent protection detection circuit applied to high-power motor drive chips. The overcurrent protection detection circuit comprises an MOSFET (metal-oxide-semiconductor field-effect transistor) MI, a current sampling tube MII, a voltage comparator VC, an MOS (metal oxide semiconductor) tube M6 and a current comparator IC. Source electrodes of the MOSFET MI and the current sampling tube MII are connected with motor current voltage VBB. Grid electrodes of the MOSFET MI and the current sampling tube MII are connected. Drain electrodes of the MOSFET MI and the current sampling tube MII are connected with two input ends of the voltage comparator VC respectively. The output end of the voltage comparator VC is connected with the input end of the current comparator IC, and sampling current is compared with reference current Iref in the current comparator IC. According to comparison results, protection to maximum-peak output current in a motor current charging mode is performed.

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...

Claims

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Application Information

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IPC IPC(8): H02H3/08G01R19/00
Inventor 陈路鹏王良坤朱铁柱张明星夏存宝黄武康
Owner JIAXING ZHONGRUN MICROELECTRONICS
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