Self-activating power device gaining energy from power line magnetic field

Abstract

The invention relates to a self-activate power source which obtains energy from high-energy electric magnetic field, which comprises an energy obtainer and a power source, wherein the energy obtainer is formed by an energy obtaining coil, a peak adsorption capacitor and a choke coil; the power source is formed by rectify circuit, accumulation capacitor or battery, stabilize module, and charge control circuit; the invention can obtain enough energy, without high-voltage sharp impulse to damage the rectify stabilize circuit, to support stable working power source for the separated electric inducer and other high-voltage circuit. The invention has low activate current, wider application and long service life, etc.

Description

Technical field [0001] The invention belongs to the technical field of electric power measurement, and relates to an energy transmission device that can be used to provide a stable working power supply for optically isolated electronic current transformers and other electrically isolated meters. Background technique [0002] In recent years, with the continuous improvement of grid capacity and voltage level, the research and development of electronic current transformers that use optical fiber transmission as primary and secondary insulation isolation has been highly valued at home and abroad. Among them, the structure of "active" current transformers It is generally recognized by the industry because of its superior performance and easy industrialization characteristics. However, how to obtain the primary side power supply is currently the biggest problem hindering the further development of this technology. In the past, domestic and foreign researchers generally used the method...

AI Technical Summary

Problems solved by technology

However, how to obtain the primary side power supply is currently the biggest problem hindering the further development of this technology. In the past, domestic and foreign researchers generally used the method of transmitting laser energy from the low-voltage side to the high-voltage side through an optical cable. For example, foreign ABB companies and domestic companies have emerged All products adopt the laser energy delivery scheme. The disadvantages in the implementation of this kind of scheme are: ①, the life cycle of the laser source is short, only 8000-10000 hours; ②, the laser source is expensive, accounting for more than half of the cost of the whole machine ; ③, on-site maintenance is difficult

However, due to the large dynamic range of the power line current, there are still two technical difficulties in the operation of the above scheme. One is that when the primary current is less than 3A, the self-excited power supply cannot obtain enough energy; the other is that when the primary current increases to When above thousands of amps, self-excited power supply is not easy to solve the problem of harmful temperature rise and high-voltage spikes causing damage to devices, thus hindering the self-excited power supply technology from entering a fully practical level

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