Remote DC power monitoring system design

Probe current voltage pin 420*4450 head diameter 5.0 over current current and voltage pin

MOS power IC full range

GW MB10F 0.8A 1000V rectifier bridge

Programmable Package SG-8018CA(SG7050C) 0.67M~170M

Overview:
1 Introduction In the mid-1960s, American scientist Mass made a large number of experimental studies on the charging process of open batteries, and proposed an acceptable charging curve for batteries with the minimum outgas rate, as shown in Figure 1. Experiments have shown that if the charging current changes according to this curve, the charging time can be greatly shortened and the battery capacity and life are not affected. In principle, this curve is called the optimal charging curve. After the battery is discharged, it is returned to the working capacity by direct current through the battery in the opposite direction to the discharge current. This process is called battery charging. When the battery is charged, the positive pole of the battery is connected with the positive pole of the power supply, the negative pole of the battery is connected with the negative pole of the power supply, and the voltage of the charging power supply must be higher than the total electromotive force of the battery. There are two types of charging methods: constant current charging and constant voltage charging.

Substations, power plants, and communication equipment rooms need a stable and reliable DC power supply system to charge the battery and supply power to the control loop and the closing loop. The DC power supply manages battery charge and discharge, monitors switch status, and DC system operation to ensure safe and efficient operation of power supplies and equipment during operation. The power monitoring system has evolved from a simple monitoring function to a system with three remote and alarm functions, and a relatively complete management and remote monitoring function. The power monitoring system is based on the power monitoring and management scheme of the rail-mounted power monitoring instrument. The program is mainly composed of a touch screen, single-phase or three-phase AC signal acquisition unit and a transformer, which can collect and display voltage, current, active power, reactive power, power factor, harmonics and electric energy in real time for the data center power supply. “Energy saving and emission reduction” has become an important indicator to measure the sustainable development of enterprises in the future. With the expansion of telecommunications, banking, and large-scale enterprise services, the management and maintenance costs and rising electricity bills brought by the huge data centers have become a major problem for business executives.

2 system hardware design
2.1 Hardware circuit design The DC power system needs to collect multiple analog and digital quantities and requires multi-channel nodes and adjustable voltage output of 0 V to 4 V, that is, "four remote" function. The monitoring unit has two serial ports, one for connecting to the smart device and the other for communicating with the TC35i. The monitoring unit also requires a keyboard and LCD display. According to the above requirements, the system needs to add more peripherals based on the minimum system of the microcontroller. Using a single-chip microcomputer with a dual serial port to reduce the number of peripherals increases system cost and limits the versatility of the microcontroller itself. Its hardware schematic is shown in Figure 1.


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