Switching power supply, constant current power supply, resistance to the power supply where the benefits?
Roughly compare it
Switching power supply, RC power supply ----- these two, the general switching power supply to do greater power; resistance capacity of the power is generally micro power
Constant current power supply and the above species is not compared, the switching power supply can also be done
Capacitive power supply is a constant current power supply, the principle of its buck is the principle of "series circuit resistance divider law", the advantage is very low cost, the circuit is very simple, high efficiency in the case of constant load. It is more shortcomings, the first is the power supply circuit and its output is not isolated from the output, followed by the value of the voltage divider and the load current, not suitable for large changes in the load of the circuit (changes in efficiency will be reduced), not afraid Short circuit but fear of open circuit, and the power supply may be an instantaneous surge current, the surge current will flow through the load, it must be protected. The power factor of the circuit itself is very low.
Switching power supply efficiency, voltage, load regulation is better, suitable for power supply voltage and load current fluctuations in the larger occasions, compared to the traditional frequency transformer in terms of lighter weight, smaller size (very small power case Frequency transformer may be smaller). The disadvantage is that the switching power supply circuit is very complex, design, debugging are difficult, the cost of high power, high precision case higher, and switching power supply is high frequency power supply, interference will be more serious.
