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A hardware protection circuit with variable protection threshold

A hardware protection and circuit technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve problems such as inconvenience, and achieve the effect of improving applicability and convenient and quick modification

Inactive Publication Date: 2019-01-11
SUZHOU LVKON TRANSMISSION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Changing the threshold voltage requires changing V 1 , R 1 and R 2 The value of the actual application is inconvenient

Method used

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  • A hardware protection circuit with variable protection threshold
  • A hardware protection circuit with variable protection threshold

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Embodiment Construction

[0010] A hardware protection circuit with variable protection threshold, see figure 2 : The negative input terminal of the comparator U1 is connected to the RC filter circuit and then connected to the PWM signal. The cut-off frequency design value of the RC filter circuit is lower than the carrier frequency of the PWM. The PWM signal becomes a stable threshold voltage signal after being filtered by the RC circuit. The PWM signal is obtained by The duty cycle is generated by the control chip and changed through the set software. The positive input terminal of the comparator U1 is connected to the measured voltage signal. The output terminal of the comparator U1 is used to output the fault signal when it is at a high level. When the level is low, no fault signal is output.

[0011] The negative input terminal of the comparator U1 is connected in parallel with two lines, one of which is connected to a certain value resistor R3 and then connected to the PWM signal, and the other ...

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Abstract

The invention provides a hardware protection circuit with variable protection threshold, which adjusts the threshold voltage of a comparator by modifying the duty ratio of a PWM signal by software, thereby making the modification of the prefabricated voltage convenient and quick, and satisfying the requirement of practical application. The negative input of the comparator is connected to an RC filter circuit followed by a PWM signal. the cutoff frequency design value of the RC filter circuit is lower than the carrier frequency of the PWM, the PWM signal is filtered by the RC circuit to becomea stable threshold voltage signal. The PWM signal is generated by the control chip, the duty cycle is changed by the set software, the positive input terminal of the comparator is connected with the voltage signal to be measured, the output terminal of the comparator is used for outputting the fault signal at the high level, and the output terminal of the comparator is used for outputting the fault signal at the low level.

Description

technical field [0001] The invention relates to the technical field of hardware protection circuits, in particular to a hardware protection circuit with a variable protection threshold. Background technique [0002] The motor controller is equipped with a hardware protection circuit. When the measured voltage signal is higher than a certain threshold voltage, the comparator U 1 Generate a fault signal for fault protection. threshold voltage by reference voltage V 1 Partial pressure is obtained. Such as figure 1 shown, when the measured signal voltage is higher than V 1 R 2 / (R 1 +R 2 ), the comparator U 1 Output high level; when the measured signal voltage is lower than V 1 R 2 / (R 1 +R 2 ), the comparator U 1 Output low level, by detecting the fault signal output by the comparator, the relationship between the measured voltage signal and the threshold voltage can be judged. Changing the threshold voltage requires changing V 1 , R 1 and R 2 value, which is i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/09
CPCH02H7/09
Inventor 李磊张雷
Owner SUZHOU LVKON TRANSMISSION TECH CO LTD