Full
Outline
In explosive hazardous environments, transient energy still transfers to the load when the semiconductor switching element of the current-intercepting intrinsically safe power supply cuts off the overcurrent main circuit. In view of this problem, a scheme was proposed to add transient suppression components in the overcurrent protection circuit to reduce the rising rate of short-circuit current and thereby suppress transient energy. Through the analysis of the short-circuit discharge process, a mathematical model of short-circuit discharge was established. Multisim was used to simulate and analyze protection circuits with different inductance values, and the nonlinear relationship between inductance parameters and transient energy was obtained. Increasing inductance can suppress the amplitude of transient current, but excessive inductance will prolong the protection response time, leading to energy accumulation. Based on the short-circuit discharge model, an intrinsically safe power supply was designed and fabricated. The test results show that increasing inductance can effectively suppress short-circuit current and transient energy. A 47 μH inductance can reduce the short-circuit current to 0.988 A and the transient energy to 1.17 μJ, which are 87.3% and 33.9% lower than those of the inductance-free circuit, respectively. Combined with the parallel freewheeling diode, the peak transient voltage has been limited within the safe threshold, which provides a theoretical and test basis for the transient suppression design of intrinsically safe power supplies.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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