Energy-taking power supply circuit of cable temperature monitoring device

Abstract

The invention discloses an energy taking power supply of a cable temperature monitoring device. The energy taking power supply comprises an energy taking coil arranged on a cable in a sleeving manner, a rectification filtering circuit connected with a secondary side winding of the energy taking coil, a voltage stabilizing module connected with the rectification filtering circuit, and a supercapacitor connected with the voltage stabilizing module, wherein the voltage stabilizing module outputs direct current power. According to the energy taking power supply, the problem of a 'energy taking dead zone' caused by low current during energy taking of a current transformer is solved, namely if the current on the primary side is relatively low, the output voltage is low and can not meet the requirement on power supplying; the supercapacitor is used as a backup power supply of a monitoring system, and can be used in a place with insufficient induction energy taking; the problem that energy taking of the current transformer is saturated under high current, namely if the current on the primary side is relatively high, the output voltage is high; a wide-input DC-DC voltage stabilizing circuit is adopted for ensuring that 5V output voltage is stable; a DC-DC voltage reducing module has the advantages of high efficiency and small size compared with linear voltage stabilization.

Description

technical field [0001] The invention relates to the field of cable temperature monitoring on the side of an AC grid, in particular to an energy-taking power supply circuit of a cable temperature monitoring device. Background technique [0002] On-line monitoring of cable temperature is very important for system operation, but due to the large number of nodes, wide distribution, harsh environmental conditions, and difficult installation of monitoring equipment, the battery-powered mode of monitoring equipment is not suitable. Therefore, there is an urgent need for a stable, reliable, easy-to-install and maintenance-free power supply solution. The existing power supply methods for monitoring equipment suitable for transmission lines, such as solar energy and capacitor voltage division, are difficult to transplant to the power supply of cable monitoring systems. Other novel power supply methods, such as laser, microwave and ultrasonic, face problems of high cost, low conversio...

AI Technical Summary

Problems solved by technology

Therefore, it is necessary to solve the problems of current transformers such as low current variation, low energy extraction efficiency, and low reliability as soon as possible.

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