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

A solid-state circuit breaker, normally-on technology, applied in circuit devices, emergency protection circuit devices, electrical components, etc., can solve the problems of Si-based SSCBs that cannot work reliably, cannot guarantee the safe operation of the system, and high conduction loss of Si devices. Achieve the effect of eliminating the current detection device, reducing the loss and improving the reliability

Inactive Publication Date: 2016-04-20
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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AI Technical Summary

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 circu

Method used

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

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Embodiment Construction

[0034] In order to facilitate the understanding of the present invention, further explanation will be given below in conjunction with the accompanying drawings and specific embodiments as examples, and the embodiments do not constitute a limitation to the present invention.

[0035] The present invention provides a self-powered DC solid-state circuit breaker based on normally-on SiC devices, such as figure 1 As shown, it includes a normally-on SiC power switch tube, a current detection circuit, and a negative voltage shutdown circuit. The normally-on SiC power switch tube is used to realize overcurrent protection by detecting the drain-source voltage of the power switch tube; the drain-source voltage in the fault state is used as the input power supply of the negative voltage shutdown circuit to realize the self-power supply of the circuit breaker. Compared with traditional solid-state circuit breakers, this solid-state circuit breaker does not require complex current detectio...

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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...

Claims

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Application Information

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IPC IPC(8): H02H3/08H02H1/06
CPCH02H3/087H02H1/063
Inventor 王丹秦海鸿徐华娟董耀文
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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