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Brushless DC Motor Controller Overcurrent Protection Circuit

An overcurrent protection circuit, brushed DC motor technology, applied in emergency protection circuit devices, protections that respond to overcurrents, electrical components, etc. The protection circuit has problems such as false protection, and achieves the effect of suppressing high-frequency interference signals, ensuring normal operation, and preventing false protection.

Inactive Publication Date: 2016-11-23
BEIJING SHUGUANG AERO ELECTRICAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The disadvantage of the above-mentioned current protection circuit is: the precision of the current over-current protection is low, and false protection is prone to occur.
Using simple capacitor filtering, due to the large peak of current high-frequency interference signal, it is easy to cause false protection of the over-current protection circuit, so that the brushless DC motor cannot operate normally

Method used

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  • Brushless DC Motor Controller Overcurrent Protection Circuit
  • Brushless DC Motor Controller Overcurrent Protection Circuit
  • Brushless DC Motor Controller Overcurrent Protection Circuit

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Embodiment Construction

[0010] The present invention will be described in further detail below. see figure 2 , a brushless DC motor controller overcurrent protection circuit, characterized in that the overcurrent protection circuit is composed of a current sensor N, a comparator U1, an amplifier U2, a diode D, a capacitor C1 and resistors R1 to R9; one end of the resistor R1 is connected to Power supply -15V connection, the other end of the resistor R1 is connected to the inverting input terminal of the comparator U1, the resistor R2 is connected between the inverting input terminal and the output terminal of the comparator U1, the positive input terminal I+ of the current sensor N is connected to the power supply Positive connection, the negative input terminal I- of the current sensor N is connected to the positive power supply input terminal of the brushless DC motor, the signal output terminal of the current sensor N is respectively connected to the positive input terminal of the comparator U1 a...

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Abstract

The invention belongs to the design technology for an electric motor controller and relates to improvement of an overcurrent protection circuit for a controller of a brushless direct current motor. The overcurrent protection circuit is characterized by consisting of a current sensor N, a comparator U1, an amplifier U2, a diode D, a capacitor C1 and resistors R1 to R9. The overcurrent protection circuit has the advantages that the overcurent protection precision is high, the high-peak current high-frequency interference signals can be effectively inhibited, the mistake protection is prevented, and the normal operation of the brushless direct current motor is ensured.

Description

technical field [0001] The invention belongs to the motor controller design technology and relates to the improvement of an overcurrent protection circuit of a brushless DC motor controller. Background technique [0002] Most brushless DC motors need to limit the output current to prevent damage to the power switch and demagnetization of the permanent magnets of the motor caused by excessive current during starting or sudden reversal. It is also not allowed for the motor load current to be too high continuously. Therefore, an overcurrent protection sampling circuit is generally set in the brushless DC motor control circuit. For the current overcurrent protection circuit of a brushless DC motor controller, see figure 1 , which consists of a current sensor N, a resistor R10 and a capacitor C2. The positive input terminal I+ of the current sensor N is connected to the positive pole of the power supply, the negative input terminal I- of the current sensor N is connected to th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/00H02H3/08
Inventor 于淑炜
Owner BEIJING SHUGUANG AERO ELECTRICAL
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