A micropower energy harvesting transformer device

Abstract

The invention discloses a micro-power energy taking transformer device. The micro-power energy taking transformer device comprises a transformer installation plate, wherein a transformer, an air discharge gap and a rectification bridge circuit are arranged on the installation plate, the transformer is connected with the air discharge gap and the rectification bridge circuit separately, the voltage of an input side of the transformer is limited by means of the air discharge gap in an approximate uniform electric field, the voltage of an output side of the transformer is limited by a diode with positive and negative conduction gate voltages in parallel connected to the transformer and an auxiliary winding sharing an iron core with an input winding and an output winding, the voltage of the air discharge gap in the uniform electric field is stable, an organic matter easy to be aged does not exist, the working lifetime is long, and the fabrication cost is low. Residual heat is dissipated onto the transformer with favorable cooling performance by a principle of magnetic field balance, residual cooling plates are not needed to be additionally arranged on the output side, the construction cost is reduced, and the device reliability is improved.

Description

technical field [0001] The invention specifically relates to the field of power grids, in particular to a micro-power energy harvesting transformer device. Background technique [0002] There are two problems when the power-taking device adopts the working principle of capacitor (or resistance, etc.) voltage division to obtain energy from the line: First, the power supply characteristics of the power-taking device are similar to the current source, and the change of the load can easily cause the output voltage of the transformer to fluctuate. fluctuation. Second, the transformer input side circuit of the power-taking device needs to withstand short-term power frequency overvoltages that are more than 7 times the rated voltage, and lightning strike overvoltages that are dozens of times or higher. These overvoltages not only affect the load but also seriously test the insulation of the transformer itself. [0003] At present, the main solution to the first problem is to make...

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Problems solved by technology

[0002] There are two problems when the power-taking device adopts the working principle of capacitor (or resistance, etc.) voltage division to obtain energy from the line: First, the power supply characteristics of the power-taking device are similar to the current source, and the change of the load can easily cause the output voltage of the transformer to fluctuate. fluctuation

The above solutions have the following problems: first, the energy extraction efficiency is low, and the cost of the transformer is high, which leads to a decrease in the cost performance of the power extraction device; second, the voltage limiting components in the electronic voltage limiting module tend to be overheated or require a large configuration The bulky heat sink and electronic components are prone to reverse breakdown and damage; the third is that the zinc oxide arrester is prone to material aging and failure

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