High-voltage wire magnetic field induction energy taking device for high-voltage transmission line online monitoring

Abstract

The invention discloses a high-voltage wire magnetic field induction energy taking device for high-voltage transmission line online monitoring. The device comprises a coil (1), a rectification circuit (2), a switching circuit (3), a control circuit (4) and an energy storage circuit (5), wherein the coil is sleeved on a high-voltage wire; alternating current is induced from the high-voltage wire and is fed to the rectification circuit by utilizing the electromagnetic induction principle, the alternating current is converted into direct current through the rectification circuit and charges the energy storage circuit, and the switching circuit (3) is connected in parallel at the output end of the rectification circuit (2); and the control circuit detects output voltage of the energy storage circuit, so that the on / off of the switching circuit is controlled, and the energy storage circuit outputs voltage and current. The application range of the energy taking device is reduced, and the power loss of the switching circuit is reduced; because the switching circuit is positioned in a switch-on state for a long time in actual use, and the magnetic induction intensity in a magnetic core of the coil is low, the power loss of the magnetic core is reduced; and because the whole power loss of the energy taking device is reduced, the service life of the device is prolonged, and the stability and the reliability of the device are greatly improved.

Description

technical field [0001] The invention relates to a wire magnetic field induction energy harvesting device, in particular to a high-voltage wire magnetic field induction energy harvesting device for on-line monitoring of high-voltage transmission lines. Background technique [0002] With the development of science and technology, various physical parameters of live detection lines are increasingly required in the field of high-voltage transmission lines. A considerable number of devices will be suspended on high-voltage transmission wires to measure physical parameters such as wire temperature and wire sag. Because these monitoring devices need to be installed directly on the high-voltage transmission line, what method to use to power the device is a problem that we need to focus on. At present, the power supply methods that are widely used mainly include solar power supply, battery power supply, magnetic field induction power supply, laser power supply, etc. The working prin...

AI Technical Summary

Problems solved by technology

Transistors, bidirectional thyristors and other components can work stably for a long time only when they are fully turned on or completely turned off. A large amount of power consumption is generated, causing the components to overheat and burn

[0008] The problem with the control strategy of the energy harvesting device described in Chinese invention patent 201110323678.x is that the control circuit forms an analog voltage feedback, and the strength of the control signal is proportional to the output voltage of the device, that is, the control signal is an analog quantity.

Therefore, there is a problem of the strength of the control signal. First, when the current of the transmission line is at a critical value (that is, the output voltage of the coil is near the maximum output voltage value), the control signal output from the control circuit is relatively weak, so that the triac is incomplete. It is turned on and not completely turned off, resulting in huge power consumption, which will soon cause the thyristor to burn out; secondly, because this control strategy forms a negative feedback, in practice, the output voltage of the device will gradually stabilize and the control signal will gradually become stable. In weak cases, especially the output voltage value will continue to change back and forth near the steady-state output voltage value, which will cause the bidirectional thyristor to be neither completely turned on nor completely turned off, and frequent transitions between the on state and the off state will occur. conversion, causing a large power dissipation, which burns

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