Rapid overcurrent detection circuit applied to magnetic current sensor

Abstract

The present invention relates to a rapid overcurrent detection circuit, especially to a rapid overcurrent detection circuit applied to a magnetic current sensor which can ensure rapid response while achieving accurate detection with good overcurrent prompting. The rapid overcurrent detection circuit comprises a Hall device, a switching set, an amplifier and a signal processing circuit which are connected in series, the Hall device is configured to induct magnetic field signals, an overcurrent signal detection module is arranged at the middle portion of the amplifier and the signal processing circuit, the overcurrent signal detection module comprises two sets of high-speed comparers, input ends of the two sets of high-speed comparers are connected with the output end of the amplifier, output ends of the two sets of high-speed comparers are connected with input ends of corresponding gate circuits, the output ends of the gate circuits are connected with the input end of a digital processing module, the output end of the digital processing module is connected with the input end of the digital comparer, and the output end of the digital comparer outputs overcurrent indication signals.

Description

technical field [0001] The invention relates to a fast overcurrent detection circuit, in particular to a fast overcurrent detection circuit applied to a magnetic current sensor. Background technique [0002] The current sensor chip is a chip that uses semiconductor magnetic sensor (Hall, magnetoresistance) technology to obtain the amplitude and polarity of the current signal flowing through the conductor by sensing the magnetic field formed by the energized conductor inside (or outside) the chip. This chip is widely used in industrial control, home appliances, electric vehicles and other applications. [0003] Due to the semiconductor process, the Hall device has a large zero-drift voltage in application. In order to suppress the interference of the zero-drift voltage on the output signal, modulation methods such as the rotating current method are generally used to modulate the effective induction signal to a higher frequency, so that it can be separated from the lower-freq...

AI Technical Summary

Problems solved by technology

[0009] In order to solve the problem that over-current detection cannot be performed quickly and accurately, the present invention provides a fast over-current detection circuit applied to magnetic current sensors, which can realize accurate detection of over-current prompting and ensure fast response at the same time

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