Electric energy meter and RC (Remote Control) power supply thereof

Abstract

The invention discloses an electric energy meter and an RC power supply of the electric energy meter. The RC power supply comprises a rectifying energy providing unit and a direct-current power conversion unit connected with the rectifying energy providing unit; the rectifying energy providing unit can process the electric energy provided by alternating-current power supply at the first half circle to acquire rectifying electric energy, and can send the rectified electric energy to the direct-current power conversion unit so as to be processed and then send the direct-current power to an output port; the RC power supply further comprises an accumulated energy providing unit which can process the electric energy provided by the alternating-current power supply at a second half circle to acquire accumulated energy, so that the accumulated energy and the rectifying electric energy can be sent to be direct-current power conversion unit at the first half circle of the alternating-current power supply, so as to be converted into direct-current power for outputting. According to the electric energy meter and the remote control power supply of the electric energy meter, the reliability can be effectively improved, and electric energy utilization efficiency can be improved.

Description

technical field [0001] The invention relates to power equipment, in particular to a power supply for an electric energy meter. Background technique [0002] Because the switching power supply has the advantages of high efficiency and high reliability, it is widely used in the current electric energy meter. However, the application of switching power supply will also bring some corresponding problems, such as high cost, large number of components and large PCB area occupied, and high switching frequency will cause electromagnetic interference problems. Due to the simple circuit and low cost of the RC power supply, it is also used in some low-cost, low-power energy meters. However, the existing RC power supply is connected between two AC power supply lines. An RC step-down circuit connected to a power supply line, a rectifier diode whose anode is connected in series with the RC step-down circuit, an electrolytic capacitor connected in series between the cathode of the rectifi...

AI Technical Summary

Problems solved by technology

However, the application of switching power supply will also bring some corresponding problems, such as high cost, large number of components and large PCB area occupied, and high switching frequency will bring electromagnetic interference problems

Due to the simple circuit and low cost of the RC power supply, it is also used in some low-cost, low-power energy meters. However, the existing RC power supply is connected between two AC power supply lines. An RC step-down circuit connected to a power supply line, a rectifier diode whose anode is connected in series with the RC step-down circuit, an electrolytic capacitor connected in series between the cathode of the rectifier diode and another power supply line, and the electrolytic capacitor connected in parallel A voltage stabilizing circuit, the output direct current of the voltage stabilizing circuit is used to power the microprocessor in the energy meter and other electrical circuits to work normally. The RC power supply of this structure can only make the rectifier diode conduct in one and a half cycles of the AC mains , charge the electrolytic capacitor and directly provide energy for the voltage regulator circuit. In the other half cycle of the AC mains, the rectifier diode is cut off. At this time, only the electricity stored in the electrolytic capacitor can provide energy for the voltage regulator circuit. Therefore, in order to meet For the normal operation of the electric circuit, it is necessary to choose a large-capacity electrolytic battery and a lower-value drop-down resistor to achieve the necessary energy storage, and the use of a smaller-value resistor will increase the energy consumption of the drop-down resistor itself. , which not only requires the selection of a higher power level drop resistor, thereby reducing the reliability of the electric energy meter, but also increases the overall power consumption of the electric energy meter, resulting in a waste of electric energy

[0003] It can be seen that the existing RC power supply has the problems of low reliability and low power utilization efficiency, which need to be improved

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