Thailand Rectifier Battery Charger

Thailand Rectifier Battery Charger: Why choose -48V as supply voltage instead of +48V?
The telecommunication power supply system is the heart of the communication system. A stable and reliable communication power supply system is the key to ensure the safe and reliable operation of the communication system. The communication circuit is interrupted and the communication system is paralyzed, resulting in great loss of economic and social benefits. Therefore, the communication power system occupies a very important position in the communication system.
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1. The voltage is relatively safe. For example, the human body is a 50K ohm resistor, the voltage is -48V, 48/50000=0.00096A=0.96mA, and the human body is in danger of life when it flows through 9mA.
2. the lineage of history. N years ago, when using electronic tubes and PNP germanium tubes, the positive grounding of the circuit was intuitive, simple and convenient. The anti-interference of the negative power supply is better, but this is the reason for a long time ago, and the current digital technology does not have high requirements for this, so now the equipment also uses a positive power supply, but considering the generality of the habit, it is mostly -48V
3. Grounding the positive pole of the power supply system can reduce the corrosion of the positive pole of the battery
4. Reduce system noise and interference.
5. The earth can be used as a loop for early communication, saving wires
6. In order to protect the cable from being corroded by the battery reaction, the cable must be negative.
7. The voltage is higher than -24V, which is conducive to power transmission and reduces loss
The telephone line environment is complex. Before the invention of the all-plastic cable, the line insulation was often poor. The negative power supply was less affected by the ground noise than the positive power supply. This habit is still in use today.
Why ground the positive pole? First of all, the power supply must be grounded, which can effectively avoid noise and other interference. Choosing a positive ground can minimize corrosion of the grounding device.
As for why 48V was chosen, 24V and 60V were originally used in communication, and then gradually unified to 48V. For voltages higher than 48V, it may cause personal injury. If it is lower than 48V, the current on the line of the load with the same power is too large. , It is necessary to choose a thicker power line, invest in playing, and the loss of line voltage drop will be large.
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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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Website: www.bestpluspower.com