Brief description of redundant power supply
The redundant power supply is a kind of power supply used in the network server. It is composed of two completely the same power supplies. The integrated ic controls the power supply to carry out web services. When a problem occurs in one power supply, the other power supply can immediately take over its work. After disassembling and installing the power supply, the two power supplies cooperate with each other. The redundant power supply is to better develop the scalability of the website server. In addition to network servers, disk array system applications are also very common.
RPS power supply (RedundantPowerSystem, redundant power system software) as part of the external DC power supply system power supply of the network switch
RPS can be used as a cluster server power supply for network switches or wired routers:
L If the RPS and the electrical equipment use the same AC power supply and distribution system, when the internal power supply of the electrical equipment finds an abnormality, RPS can once again implement a DC power supply system for the industrial equipment with difficult problems to ensure the normal operation of the industrial equipment;
L If the RPS and the electrical equipment use a different AC power supply and distribution system, it can also provide the DC power supply system again when the external AC power supply system power of the electrical equipment causes difficult problems to ensure the normal operation of all industrial equipment.
What is a redundant power supply? The difference between a redundant power supply and a UPS power supply?
Power supply redundancy can generally be used in planning schemes such as volume redundancy, redundant cold backup, parallel current sharing N+1 backup data information, redundant hot backup data information and other methods. Volume redundancy means that the very large load capacity of the power supply exceeds the specific load, which is not of great practical significance for improving stability.
Redundant cold backup means that the power supply is composed of many control modules with the same function. When everything is normal, one of the power supply systems is used. When it fails, the backup data module can run and start work immediately. The disadvantage of this type of method is that there is an interval time for power conversion, which can easily lead to a gap in the operating voltage required by the work.
N+1 backup with parallel current sharing means that the power supply is composed of many identical modules, and each module is connected in parallel through OR diodes, and each module supplies power to the industrial equipment system at the same time. This kind of planning scheme is not easy to damage the load power supply system when a power supply has a difficult problem, but a short-circuit fault at the load end is very easy to affect all modules. Redundant hot backup means that the power supply is composed of many modules and can work at the same time, but only one of them supplies power to the industrial equipment system, and the others are empty. When there is a problem with the main power supply, the backup data can take over immediately, and the output voltage fluctuation is very small.
For some uninterrupted operation processes as long as possible, high reliable system software, such as communication base station communication equipment, *industrial equipment, network servers, etc., generally try to have high reliable power supply. The redundant power supply design scheme is an important part here, and plays a key function in the expandable system software. Redundant power supplies are generally equipped with two power supplies. When a power supply causes a difficult problem, the other power supply can be put into operation immediately, without stopping all the normal operation of the industrial equipment. This is a bit similar to the basic concept of UPS power supply: when the working standard voltage is turned off, the power supply system is replaced by a rechargeable lithium battery. The difference between a redundant power supply and a UPS is mainly that it is powered by different power sources at the same time, while a UPS is a power supply system, and the other is standby anytime and anywhere, and will automatically switch when needed.
Traditional redundant power cord connection
The traditional redundant power supply scheme design is that two or more power supplies are anodized according to their respective connected diodes and output to the power supply system bus in parallel in an "OR" method. One power supply can work independently, and many power supplies can work together. When one of the power supplies causes a difficult problem, it is not easy to damage the output of the power system bus because of the unidirectional conduction characteristic of the diode.
In the specific redundant power supply system software, the general current is relatively large, which can guarantee dozens of A. Taking full consideration of the efficiency loss of the diode itself, Schottky diodes with lower loss and very large current are generally used, such as SR1620～SR1660 (rated voltage 16A). Generally, a heat pipe is installed on this type of diode to dissipate heat as much as possible.
The traditional scheme of applying diodes has a simple power supply circuit, but its original shortcomings: large power loss, serious heat, need to modify heat pipes to dissipate heat, and occupy a large volume. Because the power supply circuit generally has a large amount of current, the diode is in the forward conduction mode most of the time, and the efficiency loss caused by its loss cannot be ignored. The Schottky diode with the least loss also has 0.45V. When the current is large, such as 12A, there will be a power loss of 5W. Therefore, it is necessary to solve the heat rejection problem.
The current new redundant power supply plan is to use high-power MOSFET to replace the diode in the traditional power circuit. The on-off internal resistance of the MOSFET can reach several mΩ, which greatly reduces the loss. In the use of high power, not only a high-efficiency solution is completed, but also because there is no need to save heat pipe radiators, a lot of pcbpcb circuit boards are saved, and the heat source of industrial equipment is also reduced. Use the MOSFET in the power circuit as much as possible to have professional integrated ic manipulation.
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