Ammeter power supply circuit and ammeter

Abstract

The invention provides an ammeter power supply circuit and an ammeter. The ammeter power supply circuit comprises a rectification filter circuit, a voltage regulating circuit, a high-frequency transformer, an output rectification circuit, an output filter circuit and a voltage feedback circuit. The voltage regulating circuit regulates the voltage of a high-voltage direct-current power supply according to a voltage regulating signal and outputs the regulated voltage to the high-frequency transformer; the high-frequency frequency converter carries out voltage reduction conversion on the high-voltage direct-current power supply after voltage regulation; a second high-frequency voltage pulse signal is output through a second secondary coil; the output rectification circuit rectifies a second high-frequency low-voltage pulse signal and then outputs the second high-frequency low-voltage pulse signal to the output filter circuit; the output filter circuit filters the rectified second high-frequency low-voltage pulse signal, low-voltage direct current is obtained and outputted, the voltage regulating circuit regulates the magnitude of the high-frequency voltage pulse signal output by the transformer according to the magnitude of the voltage outputted by the output rectification circuit, the conversion power is high, and when the input voltage changes, it is guaranteed that the output voltage is stable such that the voltage stabilizing range is widened.

Description

technical field [0001] The invention belongs to the technical field of electric meters, and in particular relates to a power supply circuit of electric meters and electric meters. Background technique [0002] As the functions of smart meters continue to increase, the increasingly developed communication methods are also rapidly applied to smart meters, including GPRS communication, carrier communication, wireless WIFI communication, Ethernet communication, optical fiber communication and so on. Among them, GPRS communication, wireless WFIF communication, Ethernet communication, etc. all have high requirements on the power and stability of the power supply. The traditional linear power supply cannot meet the requirements of high conversion power and wide voltage regulation range. Contents of the invention [0003] The purpose of the present invention is to provide a power supply circuit for an electric meter, aiming at solving the problem that the traditional linear power ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a power supply circuit for electric meters, which aims to solve the problem that the traditional linear power supply cannot meet the requirements of high conversion power and wide voltage stabilization range.

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