Intrinsic safety output quasi-Z-source switching converter

Abstract

The invention provides an intrinsic safety output quasi-Z-source switching converter which comprises a Buck type DC / DC switching conversion circuit, a quasi-Z-source filter network and a safety barrier protection circuit which are connected in sequence; the quasi-Z-source filter network comprises an LC filter composed of an inductor and a capacitor, another inductor, another capacitor and a diode, wherein the diode is connected in series between the first inductor and the first capacitor, the second inductor is connected to the output end of the first capacitor, and the second capacitor is connected in parallel to two ends of the diode and the second inductor which are connected in series; the input end of the LC filter is the input end of the quasi-Z-source filter network; and the connecting end between the other inductor and the other capacitor is the output end of the quasi-Z-source filter network. The intrinsic safety output quasi-Z-source switching converter has the advantages that the energy releasing speed of a circuit is decreased through the quasi-Z-source filter network so as to be matched with the safety barrier protection speed, and the energy of sparks output by the circuit during failures can be further reduced, so that the capacity of an intrinsic safety power supply is improved; the circuit structure is simple, and the reliability is high; and the advantages of the invention are incomparable with those of the traditional technology.

Description

technical field [0001] The invention relates to an intrinsically safe power supply, in particular to an intrinsically safe output quasi-Z source switching converter. Background technique [0002] Intrinsically safe power supplies play a vital role in the implementation of key equipment such as communication, monitoring, alarm, and disaster prediction and prevention used in dangerous environments such as coal mines, petroleum, and chemicals. Due to the use of energy storage elements such as inductors and capacitors in AC / DC and DC / DC converters, when a short circuit or open circuit fault occurs at the output, the energy stored in the inductor and capacitor used for output filtering will pass through in a very short time. The short-circuit / open-circuit fault point is released, and the spark generated may ignite flammable and explosive gases. Therefore, a safety barrier circuit is usually added to the output part of the intrinsically safe power supply. The safety barrier limit...

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Problems solved by technology

[0006] However, no matter what kind of safety barrier circuit is used, there are still the following defects: there is always a certain delay time from the occurrence of a short circuit / open circuit fault of the power supply output to the safety barrier protection cutting off the energy output, so when a fault occurs, excessive energy is output and electric sparks are generated. still more likely

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