Philippines Rectifier Power Supply

Philippines Rectifier Power Supply: TeleCommunication power is the key infrastructure of the entire telecommunication network, but the proportion of communication power in the entire communication industry is not large. The purchases of power products by telecom operators are mainly annual equipment maintenance and system equipment, among which the maintenance of power equipment usually accounts for a higher proportion of the purchase amount. The annual cost of telecom operators for the construction of power supply systems is relatively small. Unless the telecom system needs to be upgraded or expanded on a large scale, operators will increase the purchase of power supply equipment.
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+48V and -48V have the same voltage, but the current flows in different directions. +48V flows to 0V and V0 flows to -48V.
The -48V power supply system is only a communication power supply standard adopted by my country and most countries. Not all countries use this standard. For example, Russia uses a -60V power supply system, and some countries use a -24V power supply system. If the product is to be sold in these regions, it is necessary to take into account these different standards.
Lighting line 220V, power line 380V, 48v electric vehicle voltage, and other places need, 48, -48V is DC. Because the DC voltage of 36V is defined as a safe voltage internationally, weak currents are basically operated in integer multiples of 6, 6V/12V/24V, 36V and so on.
48V is generally used in the field of DC drive. It has a safe voltage, but it can provide larger capacity. Therefore, electric bicycles are generally driven by 36V and 48V.
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In the telephone era, the -48V power supply was applied to the central office to feed fixed telephones. Assuming that the link from the convergence point of the telephone office to the user is full of water vapor, and the insulation of various termination points and the cable itself is not good, this is a very common situation, such as in some damp pipes or manholes. The voltage of 48V is enough to electrolyze water. The electrolysis process is oxygen evolution at the positive electrode and hydrogen evolution at the negative electrode. The oxidation reaction of the positive metal material will be quite serious. Due to the existence of grounding, if the negative electrode is grounded, there is no potential between the negative electrode and the ground, and the positive electrode has a potential of 48V, and the positive electrode is rapidly oxidized after oxygen evolution. On the contrary, the positive electrode is grounded, there is no potential difference between the positive electrode and the ground, and the negative electrode is electrolyzed after the water is electrolyzed. As for the return path of the leakage current, the ground or the positive cable can be used, depending on the return impedance. In short, the corrosion of positive grounding to metal conductors such as cables is much less than that of negative grounding. It still seems reasonable to use a negative power system for communication power supplies.
Why use 48V? Generally speaking, no matter how high the voltage is, it is not safe enough. It has high requirements on the insulation level of cables, and is prone to breakdown problems in humid environments. If the voltage is too low and the current is too high, it is not suitable. In addition, considering the uninterruptible power supply system using lead-acid batteries, 48V is exactly 12 2V battery cells, and for small-capacity systems, using 12V batteries, only 4 are needed. The number of strings is reasonable and the battery pack is easy to balance. In short, it is the result of comprehensive consideration of all parties.
In the -48V power supply system, the AC mains is low-distributed and converted to DC 54.5-55V using the switching power supply, which floats the battery and supplies power to the equipment at the same time. Regarding the voltage of about 54V, it is mainly determined by the floating charge voltage of the lead-acid battery, about 2.2V per grid. Considering the charging and discharging platform of the battery, the actual allowable input voltage range of the device is generally wide, at least -40V~-57V for normal operation. Usually the limit is -36V~-62V. Of course, lithium batteries have also been used in the communications industry in recent years.
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Best Plus Power is a manufacturer and provider of dependable high efficiency power electronics, energy conversion systems and power supplies. Best Plus Power solutions include a complete line of high-efficiency rectifiers, inverters and DC power systems for mission critical applications. With over 10-Years experiences supporting customers in more than 60 countries, Best Plus Power is focused on bringing reliable power solutions to customers across all applications and environments, which specialize in Battery Chargers, Power Inverters, Power Supplies / Rectifiers, DC / DC Converters, Frequency Converters, and other Power supplies.
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