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Load open circuit detection circuit and method for high-side intelligent power IC and application

A technology of open circuit detection and intelligent power, which is applied in the direction of measuring electrical variables, electronic circuit testing, measuring current/voltage, etc., can solve problems such as redundant voltage and repeated switching of power tubes, and achieve the effect of improving effectiveness

Pending Publication Date: 2022-07-29
合肥仙湖半导体科技有限公司
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AI Technical Summary

Problems solved by technology

The circuit adopts double judgment mode and hysteresis comparator to solve the problem of redundant voltage and detection error caused by traditional current detection, as well as the problem of repeated switching of power tube caused by external interference, and improves the accuracy and reliability of load open circuit detection

Method used

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  • Load open circuit detection circuit and method for high-side intelligent power IC and application
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  • Load open circuit detection circuit and method for high-side intelligent power IC and application

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Embodiment Construction

[0039] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, but not to limit the present invention.

[0040] like figure 1 Shown, an open-load detection circuit for high-side smart power ICs, including dual detection circuits:

[0041] By the power tube Mp and the hysteresis comparator OP 1 The formed first re-detection circuit is used to detect the voltage drop across the power device Mp;

[0042] By the detection tube Ms and the resistance R on its branch S and the comparator OP 2 The formed second detection circuit is used to detect the current on the resistor Rs.

[0043] In the technical scheme of the present invention, a double detection circuit is designed, when the first re-detection circuit outputs a low level, it will indicate that the circuit may have a f...

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Abstract

The invention discloses a load open circuit detection circuit, method and application for a high-side intelligent power IC, and the detection circuit comprises a dual detection circuit which comprises a first detection circuit composed of a power tube Mp and a hysteresis comparator OP1 and used for detecting the voltage drop at the two ends of a power device; and a second detection circuit formed by the detection tube Ms and a resistor RS and a comparator OP2 on a branch of the detection tube Ms is used for detecting the current on the resistor Rs. The circuit adopts a dual judgment mode and a hysteresis comparator, solves the problems of redundant voltage and detection errors caused by traditional current detection and the problem of repeated switching of a power tube caused by external interference, and improves the accuracy and reliability of load open circuit detection.

Description

technical field [0001] The invention relates to the technical field of electrical and electronic equipment control, and in particular to an open-load detection circuit, method and application for a high-side intelligent power IC. Background technique [0002] High-side power driver chips can achieve more functions by integrating control modules, driver modules and other protection circuit modules with power devices, and are widely used in new energy vehicles, automation control and other electronic products. In order to ensure the normal operation of the driver chip, various protection circuits need to be added. Among them, the load open circuit detection circuit sends a feedback signal to the system in time when an open circuit fault occurs in the load through real-time detection and feedback of the load status. This type of circuit generally detects the current on the load. The first method is to detect the current on the voltage divider resistor on the main path, but this...

Claims

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Application Information

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IPC IPC(8): G01R31/28G01R19/165
CPCG01R31/28G01R31/2851G01R19/165G01R19/16533
Inventor 黄明乐鲁怀贤
Owner 合肥仙湖半导体科技有限公司
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