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In circuit analysis, the parallel connection of power supplies is an important concept. When two or more power supplies are connected in parallel, what is the voltage relationship between them?
First, the basic concept of parallel power supply.
Parallel power supply, as the name suggests, refers to the positive and negative poles of two or more power supplies connected together separately to form a parallel circuit structure. In this configuration, each power supply independently supplies power to the circuit, and the total current of the circuit is the sum of the individual supply currents. But when the power supplies are connected in parallel, do they simply add up their voltages? The answer is no.
Second, the voltage characteristics of the parallel power supply.
Ideally, if two identical power supplies (i.e., the same voltage and internal resistance) are connected in parallel, then their output voltages will remain the same, equal to the voltage of a single power supply. This is because a parallel power supply is actually "boosted" on the current** rather than superimposed on the voltage. In other words, a parallel power supply increases the current capacity of the circuit, not the voltage.
However, in practice, the exact same power supply is rare. It is more common for two power supplies with different voltages or different internal resistance to be connected in parallel. In this case, the determination of the output voltage becomes complicated.
3. Parallel connection of power supplies of different voltages.
When two power supplies with different voltages are connected in parallel, the output voltage depends on several factors, including the internal resistance of the power supply, the impedance of the external circuitry, and how the power supplies are connected. In general, if the internal resistance of the two power supplies is very different, then the output voltage will be closer to the voltage of the power supply with the lower internal resistance. This is because a power supply with less internal resistance is able to provide more current, which leads to a dominant position in parallel circuits.
However, if the internal resistance of the two power supplies is similar, then the output voltage may be between the voltages of the two power supplies. The exact value depends on the impedance of the external circuit and the relative magnitude between the power supplies. In this case, it may be necessary to use complex circuit analysis methods to accurately calculate the output voltage.
Fourth, the practical application and precautions of parallel power supply.
In practical applications, parallel power supplies are often used to increase the current capacity of a circuit or to provide redundant power to increase the reliability of the system. For example, in a computer server or communications equipment, multiple power modules connected in parallel may be used to ensure that the device remains functional in the event of a single power failure.
However, there are a few things to keep in mind when using a parallel power supply:
Make sure the power supply has the same polarity. If the positive and negative poles are connected together incorrectly, it can cause a short circuit and damage the power supply or circuit.
Consider the internal resistance and current capacity of the power supply. If the internal resistance or current capacity of two power supplies is very different, then they may not be able to share the load efficiently, resulting in one power supply being overloaded and the other sitting idle.
Monitor the working status of the parallel power supply. By using instruments such as voltmeters and ammeters to monitor the output voltage and current of parallel power supplies in real time, potential problems can be found and solved in time.
V. Conclusions and prospects.
In summary, the voltage of two power supplies in parallel is not simply additive. In an ideal world, if two identical power supplies are connected in parallel, the output voltage remains the same; In practice, the output voltage depends on a number of factors, including the internal resistance of the power supply, the impedance of the external circuitry, and how the power supplies are connected. Therefore, these factors need to be carefully considered when using parallel power supplies, and appropriate measures should be taken to ensure the stability and reliability of the circuit.
Looking to the future, with the development of power electronics technology and the emergence of new power supply materials, we can expect more efficient, stable and reliable parallel power solutions. At the same time, with the popularization of smart grids and distributed generation systems, parallel power sources will play an increasingly important role in energy management and energy conservation and emission reduction.