Abstract
Electronic breakers or fuses are most widely used tools to protect the electric-driven facilities from overload or short circuit. However, they may suffer from two major drawbacks: (1) it normally takes more than 0.1 s to react, resulting in facilities not sufficiently protected, and (2) a higher rating size of breakers or fuses is demanded than expected due to lack of a surge current suppression mechanism. To overcome these problems, this paper proposes a fast large current electronic breaker based on the integration of current divider sensing and surge suppressing methods. The load surge current can be effectively suppressed by series negative temperature coefficient (NTC) thermistors. The load current is then divided into a small portion and converted to a voltage signal for amplification and comparison with the predefined threshold value, i.e., the maximum load tolerance current. AC power will be disconnected immediately by the switching circuit once the load current exceeds the tolerance value. The disconnection of power supply will continue for a period of time set by the timer. The experimental results verify that the proposed electronic breaker can provide a large load current protection up to 20 A under effective surge suppression within 10 ms.
Highlights
The growth of world economics has driven an increasing demand for industrial equipments and home appliances
The power supply can be cut off taking less than 10 ms whenever the overload or short circuit is detected
This paper has integrated surge current suppression and current divider sensing methods to realize a fast large current electronic breaker. It proves that the maximum surge current can be effectively suppressed below 20 A from 37.6 A
Summary
The growth of world economics has driven an increasing demand for industrial equipments and home appliances For this reason, the protection for such facilities has attracted more attention in recent years. The fuse is well known as a simple and cheap device used to interrupt fault currents instantly [4, 5] It has two major disadvantages: (1) it is a single-use device so that it is unrecoverable and (2) its reaction time may take more than 50 ms that is insufficiently fast to protect some facilities. The power supply can be cut off taking less than 10 ms whenever the overload or short circuit is detected This method is only suitable for applications in small-size loads like 3 A due to direct use of current sensor
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