Power solution for three-phase four-wire smart meter

1 Introduction

The traditional three-phase four-wire smart meter solves the power supply requirements of high-voltage input and four-wire system, uses 3PCS power frequency transformer for voltage conversion, and then realizes DC voltage output through rectification and filtering circuit. The advantage of this scheme is cost. Low, the disadvantage is that it is bulky. At the same time, the operating voltages of three-phase four-wire smart meters vary greatly from country to country and from region to region. At present, some countries (such as China, Russia) have actual power supply voltages of 380VAC, while some countries (such as the United States) have reached 480VAC. If such a high supply voltage is directly connected to the 85-264VAC input AC/DC power supply through the line-line, the power supply will be damaged by overvoltage. As a result, conventional power supplies with 85-264 VAC inputs are no longer sufficient for this application. In order to meet the global single-phase or three-phase input voltage (100VAC~480VAC) and the small size of the smart meter, Jinshengyang has introduced a small-volume cost-effective switching power supply LS03-16BXXSS series with 90-528VAC input.

2, three-phase smart meter power solution

Jin Shengyang micro-power three-phase four-wire power supply LS03-16BxxSS or LD03-16BxxSS series can solve the problems of large size, complicated design and high input voltage of power frequency transformer. The following is a power solution for a three-phase smart meter.

Figure 1 Block diagram of three-phase four-wire smart meter

Figure (1) is a functional block diagram of a three-phase four-wire smart meter. It is mainly composed of EMC protection, power module, network module, human-computer interaction module, high-speed data processor, real-time clock, data interface and acquisition module. This program is recommended to use Jin Shengyang LS03-16BxxSS (or LD03-16BxxSS) series switching power supply. This power input voltage is 90-528VAC, which can be directly charged from any phase voltage or line voltage in the front-end three-phase input without damage to the module due to overvoltage. After being converted into an isolated DC power supply by LS03-16BxxSS, the LDO is converted to supply power to other functional modules of the system. Considering that the smart meter needs to provide information and exchange data to the external interface, in order to make the signal transmission stable and reliable, it is recommended to select a communication module with integrated isolated power supply, such as Jinshengyang TDX01D485 series 485 communication module, which can effectively suppress electromagnetic interference and eliminate ground loop. influences.

3, LS03-16BxxSS series module power supply introduction

The LS03-16BxxSS series is a small-volume switch module power supply provided by Jin Shengyang to customers. This series of power supplies has the advantages of global input voltage range, AC and DC, low power consumption, high efficiency, high reliability and safe isolation. At the same time, this series of power supplies also meet the international UL60950/EN60950 standard. It can be widely used in industrial control and power instrumentation, etc. where the volume is demanding, the input voltage is wide, and it is required to meet UL/CE certification and low EMC requirements.

Features:

● Ultra-wide input voltage: 90~ 528VAC

● AC and DC (the same terminal input voltage)

● 4000VAC high isolation voltage

● Small size, high power density

● Output short circuit, over current protection

● Industrial operating temperature range: -40 ° C ~ +85 ° C

● Compliance with UL60950/EN60950 certification standards

4, LD03-16Bxx series module power supply introduction

For wide-voltage input micro-power three-phase four-wire power supply, in order to meet the needs of different environmental applications, Jin Shengyang not only provides small size, high power density, economical SIP package, but also provides DIP package LD03-16Bxx with built-in EMC protection filter circuit. This product can meet the requirements of IEC 61000-6-3 and IEC 61000-6-1 without adding any EMC device under the condition that the environment is not very bad, which is convenient for customer system design.

Features:

● Ultra-wide input voltage: 90~ 528VAC/100~745VDC

● AC and DC (the same terminal input voltage)

● 3000VAC high isolation voltage

● Small size, high power density

● The bare metal product can meet the requirements of IEC 61000-6-1 and IEC 61000-6-3 EMC standards.

5, LO10-26D0512-04 three-phase four-wire power meter dedicated power supply

There are two ways to connect the meter to the grid, either directly or via a voltage transformer. If connected via a voltage transformer, the input voltage will be as low as 60V according to IEC 62052-11:2003. In order to meet the requirements of smart meter's lower input voltage and single-phase or three-phase input in the power industry, Jinshengyang has introduced a switching power supply with an ultra-wide input voltage range designed for three-phase four-wire power meter.

The LO10-26D0512-04 can operate at 65-460VAC or 90-650VDC ultra-wide input voltage, and meets the power requirements of rated voltage 380/220VAC (three-phase four-wire) and any two-wire operation. When the power supply system fails and the input overvoltage occurs, the power supply will automatically shut down, thus ensuring that the power supply and the terminal are not damaged.

Features:

● Three-phase four-wire ultra-wide input: 65~460VAC/90~650VDC

● Connect to any two lines of the three-phase four-wire power supply system, and the power supply works normally.

● Conduction / Radiation: CLASS B

● Group Pulse/Surge: Level 4

● With output short circuit, over current and input over voltage shutdown protection

● High efficiency, high reliability, low ripple noise, low standby power consumption

● Long life low impedance electrolytic capacitor

6, application notes

LS03-16BxxSS series power supply, if it is needed in the electromagnetic environment, in order to make the product work stably and not easily damaged by electromagnetic interference, it is recommended to add corresponding EMC peripheral circuit to the power input port to meet certain indicators of electromagnetic compatibility. Performance, as shown in Figure 5 for the recommended circuit for reference:

Note: Please refer to LS03-16BxxSS technical manual for specific component selection parameters.

7, summary

With the widespread popularity of smart meters around the world, not only does switching power supplies require small size, high reliability, etc., but switching power supplies are also compatible with multiple input voltages. With the advantages of technology platform and independent innovation capability, Jin Shengyang has carefully developed an isolated switching power supply that meets the global input voltage range, which brings convenience to the power supply design of power meters, fire monitoring and other industries.

Plastic Hairbrush

This brush is a plastic Hairbrush. It is mainly used for cleaning floor with Vacuum Cleaner. This brush is a brush with soft fur. The fur is very flexible,soft and comfortable. This brush also has PVC soft rubber roller. This design let you clean floor easily and protect the floor also. This brush is very popular in some countries that are floor with wooden floor and floor tile,it's the best choice. Now let's see some pictures blow.

Plastic Hairbrush, Round Plastic Hair Brush, Plastic Bristle Brush

Ningbo ChinaClean Household Appliances Manufacture Co., Ltd. , https://www.chinaclean-elec.com