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.
Three-phase smart meter power solutionJin 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 to an isolated DC power supply by LS03-16BxxSS, it is then supplied to other functional modules of the system through the conversion of the LDO. 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.
Application considerationsLS03-16BxxSS 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:
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.
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