Unlock instant, AI-driven research and patent intelligence for your innovation.

Motor controller overcurrent judgment and protection circuit

A motor controller and protection circuit technology, applied in emergency protection circuit devices, measuring current/voltage, instruments, etc., can solve the problem that the overcurrent of power devices cannot be measured in time, the overcurrent protection of power devices cannot be protected, and the overcurrent cannot be set. The current protection value and other issues are guaranteed to ensure safe and efficient operation, simple structure and low cost.

Active Publication Date: 2015-04-15
CHANGZHOU EASY DRIVE ELECTRICAL TECH CO LTD
View PDF5 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The reaction speed of overcurrent protection after software detection is slow, and the occurrence of overcurrent of power devices cannot be measured in time. It takes a long time to turn off the output signal after detection, and the time from overcurrent to damage of power devices is very short. , so software protection cannot provide overcurrent protection for power devices well
The oversaturation detection of the integrated driver chip can quickly detect and turn off quickly, but the overcurrent protection value cannot be set, and it cannot provide overcurrent protection for power devices well when the continuous large current does not cause oversaturation

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Motor controller overcurrent judgment and protection circuit
  • Motor controller overcurrent judgment and protection circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] An overcurrent judgment and protection circuit for a motor controller in this embodiment includes an overcurrent judgment circuit and an overcurrent protection circuit.

[0024] Such as figure 1 As shown, the overcurrent judgment circuit includes a first filter circuit, a second filter circuit, a forward current overcurrent protection value reference voltage conditioning circuit, a reverse current overcurrent protection value reference voltage conditioning circuit, and a comparator U1; The circuit is connected to the signal output terminal of the current sensor 1, and the second filter circuit is connected to the signal output terminal of the current sensor 2; the first filter circuit, the second filter circuit, the forward current overcurrent protection value reference voltage conditioning circuit, and the reverse The output terminals of the current overcurrent protection value reference voltage conditioning circuit are connected to the input terminal of the comparator...

Embodiment 2

[0035] On the basis of Embodiment 1, the overcurrent judging circuit of this embodiment further includes a first input signal conversion unit and a second input signal conversion unit for converting an input current signal into a voltage signal, wherein: the first input signal The conversion unit includes a resistor R5, one end of the resistor R5 is grounded, and the other end is connected to the signal output end of the current sensor one; the second input signal conversion unit includes a resistor R6, one end of the resistor R6 is grounded, and the other end is connected to the signal output end of the current sensor two.

[0036] In this embodiment, a first input signal conversion unit and a second input signal conversion unit are added, and the overcurrent judging circuit can be used to connect to a current output type current sensor, and has strong versatility. The output current signals of the current sensor 1 and the current sensor 2 are respectively converted into volta...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a motor controller overcurrent judgment and protection circuit which comprises an overcurrent judgment circuit and an overcurrent protection circuit. The overcurrent judgment circuit comprises a first filter circuit, a second filter circuit, a forward current overcurrent protection value reference voltage conditioning circuit, a reverse current overcurrent protection value reference voltage conditioning circuit and a comparator U1. The overcurrent protection circuit comprises a trigger retaining circuit connected with the output end of the overcurrent judgment circuit, and a reset circuit connected with the trigger retaining circuit. The input end of the reset circuit is also connected with a reset signal output end of a motor master control chip. The output end of the trigger retaining circuit is also connected with a power device driving chip. The motor controller overcurrent judgment and protection circuit has the advantages of being high in response speed, low in cost, capable of setting an overcurrent protection value according to demands, good in universality and capable of providing protection for a power device in time.

Description

technical field [0001] The invention relates to the field of circuits, in particular to an overcurrent judgment and protection circuit for a motor controller. Background technique [0002] The core components of motor controllers for new energy vehicles are power devices such as MOSFETs or IGBTs, and their development trend is high current and high power. The most common form of damage to power devices is overcurrent damage, so accurate measurement of the output current of the motor controller and reliable overcurrent protection based on accurate measurement are particularly important to ensure the safe operation of the motor controller. [0003] At present, the current of the controller can be accurately measured by relying on high-precision current sensors, but the commonly used forms of over-current protection are over-current protection based on software detection or simple over-current protection based on over-saturation detection of integrated driver chips . [0004]...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/085G01R19/165
Inventor 何勤冯霞陈宇李佳阳
Owner CHANGZHOU EASY DRIVE ELECTRICAL TECH CO LTD