Taking the filter capacitor in the motor drive application as an example, the input filter capacitor capacity is directly related to the drive voltage and the maximum power of the driver. Some calculations are required. If the capacitor capacity is too small, the drive performance is insufficient; and the capacity is insufficient. Too large increases the manufacturing cost. In engineering applications, there is a rule of thumb: the value of the filter capacitor is equal to the value of the drive power. However, it should be noted that this is only for single-phase 220V AC full-wave rectification drive applications.
First of all, from the RC time constant Ï„ of the capacitor, the resistance: The greater the Ï„, the smoother the voltage across the R, and the less the ripple voltage for the pulsating power supply. In engineering, ripple requirements can be met when the RC time constant satisfies the following conditions. T is the period of the pulsating power supply, and the cycle T after the full-wave rectification of the 50 Hz mains is: 10 mS.
Therefore, the above two formulas can be obtained; R is the equivalent load resistance; C is the filter capacitor capacity. Therefore, as long as the equivalent load resistance of the motor driver is obtained, the required capacitance of the filter capacitor can be calculated.
Bitcoin mining machines are one way to obtain bitcoins. Bitcoin is an online virtual currency created by open-source peer-to-peer software. Instead of being issued by a specific currency institution, and produced by the massive computation of a specific algorithm, the Bitcoin economy uses a distributed database of nodes throughout the P2P network to identify and record all transactions. The decentralized nature and algorithm of P2P can ensure that it is impossible to artificially manipulate the value of bitcoin by producing a large number of coins.
Any computer can become a mining machine, but the returns will be low, and it may not mine a single bitcoin in a decade. Many companies have developed specialized Bitcoin mining machines with special mining chips that are tens or hundreds of times faster than normal computers.
Currency system by the user (the user through the key control wallet), trade (trade will be broadcast to the whole currency network) and miners (generated by competition calculation agreed on each node of the chain block, block chain is a distributed public authority books, contains the currency network of all the transactions happened)
Bitcoin miners manage the Bitcoin network by solving the problem of proof-of-work mechanisms with a certain amount of work -- confirming transactions and preventing double payments. Because hashing is irreversible, finding the number of random adjustments required to match is difficult, requiring a trial-and-error process that can predict the total number of times. This is where the proof-of-work mechanism comes into play. When a node finds a solution that matches the requirement, it can broadcast its result to the whole network. Other nodes can then receive the newly solved data block and check whether it matches the rule. If the other nodes calculate the hash value and find that the requirement (the operation goal required by Bitcoin) is satisfied, then the data block is valid and the other nodes accept the data block.
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