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Servo driver IGBT over-current turn-off grading protection circuit

A servo driver, graded protection technology, applied in the protection, circuits, electrical components and other directions that react to overcurrent, can solve the problem of current output graded shutdown, etc., to reduce the response time and save the time for signal processing.

Active Publication Date: 2020-07-03
NINGBO ANXIN CNC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem in the prior art that it is impossible to perform graded shutdown according to the actual current output of the servo driver, and to avoid the inevitable signal delay of the processor for electrical signal processing when the traditional IGBT is turned off by overcurrent, the present invention proposes a servo Driver IGBT over-current shutdown classification protection circuit, including main controller, three-phase signal input module, comparator module, enable module, optocoupler module and drive module, of which:

Method used

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  • Servo driver IGBT over-current turn-off grading protection circuit
  • Servo driver IGBT over-current turn-off grading protection circuit
  • Servo driver IGBT over-current turn-off grading protection circuit

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Embodiment 1

[0042] In order to solve the problem in the prior art that it is impossible to perform graded shutdown according to the actual current output of the servo drive, and avoid the inevitable signal delay of the processor for electrical signal processing when the traditional IGBT is turned off by overcurrent, such as figure 1 and figure 2 As shown, the present invention proposes a servo driver IGBT over-current shutdown classification protection circuit, including a main controller, a three-phase signal input module, a comparator module, an enabling module, an optocoupler module and a driving module, wherein:

[0043] The three-phase signal input module is used to receive the current signal of the servo drive and output the current signal to the two input terminals of the comparator module;

[0044] The comparator module includes a first comparator and a second comparator, which are used to output electrical signals LOCK2 and LOCK1 respectively according to the current signal, and...

Embodiment 2

[0071] In order to better understand the circuit of the present invention, this embodiment takes the W phase as an example to illustrate the circuit, as Figure 3 to Figure 7 As shown, a servo driver IGBT over-current shut-off classification protection circuit.

[0072] When the servo driver is short-circuited, the Hall sensor detects a real-time sudden change of current, and at this time the Hall sensor outputs the WI-IGBT signal, which is the current signal (current detection signal) for the W-phase IGBT. After the signal is rectified by the rectifying diode group D2A, it is sent to the comparator module.

[0073] When the current signal exceeds the first preset range (that is, exceeds the upper limit or lower limit threshold, setting the threshold for hard shutdown), the LOCK2 signal output by the first comparator is a low-level signal, and at this time the second bus driver U2 After receiving this level signal, and when the LOCK2 signal is low, the bus driver U2 outputs a...

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Abstract

The invention discloses a servo driver IGBT over-current turn-off grading protection circuit, and particularly relates to the field of over-current protection. The circuit comprises a main controller,a three-phase signal input module, a comparator module, an enabling module, an optical coupler module and a driving module. The comparator module compares input signals, inputs the input signals to the enabling module and the optocoupler module under the condition that the input signals exceed different preset ranges, and sends electric signals to the driving module, so that hard turn-off or softturn-off operation is completed. According to the invention, on the basis of the soft turn-off function of the driving module, the trigger source of the soft turn-off judgment signal is added, and apure hardware circuit is utilized, so that the reaction delay of IGBT overcurrent turn-off is reduced, and the IGBT is better protected from being influenced by the overcurrent or overvoltage condition.

Description

technical field [0001] The invention relates to the field of over-current protection, in particular to a servo drive IGBT over-current shutdown hierarchical protection circuit. Background technique [0002] In industrial production, servo drives are widely used. The control and protection of the IGBT module is the core technical issue of the servo drive, especially when the drive is abnormal, it is very common for the IGBT to be short-circuited and damaged. [0003] The IGBT protection of medium and high-power servo drives, in the prior art, mainly detects the Vce voltage of the IGBT, and turns on the protection mechanism when Vce is overvoltage; and for the current detection, due to the large power of the servo drive, the current variation range is large, In the general IGBT protection link, it is difficult to realize the judgment of IGBT turn-off through current in a simple way. For this reason, the prior art usually uses the HALL sensor to detect the output current signa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/08H03K17/082
CPCH02H3/08H03K17/0826
Inventor 陈振宇陈赛虎周兵兵虞乾恒朱钜録张晓峰谢子方袁世博林中轩章江锋
Owner NINGBO ANXIN CNC TECH