Self-power direct current solid state circuit breaker based on normal open type SiC device

Abstract

The invention discloses a self-power direct current solid state circuit breaker based on a normal open type SiC device, belonging to the electrical equipment and electrical engineering technical field, and comprises a normal open type SiC power switch tube, a negative pressure turn-off circuit and an absorption circuit. The circuit breaker is characterized by employing the normal open type SiC power switch tube, and realizing overcurrent protection by detecting the drain-source voltage of the power switch tube; and utilizing the drain-source voltage under a fault state as the input power source of the negative pressure turn-off circuit, and realizing the self-power of the circuit breaker. Compared with a traditional solid state circuit breaker, the solid state circuit breaker of the invention does not need complex functional circuits such as a current detection device, a signal conditioning circuit and an auxiliary source circuit, thereby reducing the loss of the solid state circuit breaker, and increasing the response speed of the solid state circuit breaker.

Description

technical field [0001] The invention relates to a self-powered DC solid-state circuit breaker based on a normally-on SiC device, belonging to the technical fields of electrical equipment and electrical engineering. Background technique [0002] With the development of the national economy, today's society has put forward higher requirements for power systems and power transmission technologies. How to further improve the stability of the power grid and provide users with high-quality power has become the development direction of the power industry. As an important link in the transmission line, the circuit breaker's performance directly affects the normal operation of the power grid. A large number of mechanical circuit breakers are used in the current power transmission system. Although it has the advantages of stable conduction and strong load capacity, its shortcomings are becoming more and more prominent as users' requirements for power quality increase. Because it cann...

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Problems solved by technology

[0004] Si-based SSCB requires multiple functional circuits to realize the fast disconnection function, which is more complicated to realize

In addition, in high-current applications, the conduction loss of Si devices is high. When there is an open circuit fault, the instantaneous increase of fault current may cause the temperature rise of the device to exceed the junction temperature limit of the Si device, so that the Si-based SSCB cannot work reliably, and the system cannot be guaranteed. safe job

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