Switching power supply and DC power supply difference
I think you should ask is the difference between switching power supply and linear DC power supply right?
Switching power supply is the unstable DC power through PWM or other means into a series of pulses, and then these pulses to rectify and filter to get a stable DC power supply, this approach is relatively efficient.
Linear power supply is through the way to get a stable power supply, low efficiency.
Switching power supply is through the switch on and off work, the output and input is not linear, the relationship is not obvious.
DC power supply is a step-down linear power supply, the output and input into a linear.
Just say it! 1 switching power supply regulator in the open and closed state of the linear power supply work in the amplification zone (specific cut-off, saturation, amplification, non-saturation in the transistor and MOSFET in the name difference) 2 switching power supply is to change the duty cycle to adjust the output According to the specific topology design can achieve step-up and step-down and linear power supply through the output sampling and reference voltage to compare the amplification to adjust the regulator tube can only step down 3 switching power supply efficiency is generally 80% of some can reach 95% linear power work to enlarge The device voltage drop is very large loss and therefore the efficiency of the lower volume of large 4 linear power supply input voltage adjustable range is relatively low
The advantages of linear power can be seen from these points: Wen Bo, noise low cost of low technology mature! Hope it helps you!
DC linear power supply is relatively heavy, filter capacitor head large, the overall volume. DC linear power supply is to adjust the tube divider to reduce the output voltage, so the burden of regulating the tube is heavy, heat and efficiency is low. But the dynamic response is very good, suitable for changes in load more frequent places, such as audio amplifier.
Switching power supply is relatively light weight, smaller size. Switching power supply is through the switch on and off the number of times or time to adjust the output power, efficiency than the linear power supply is higher, relatively small amount of heat, but the dynamic response is poor, suitable for more stable load place. Switching power supply filter capacitor due to the high frequency, so the interference of the power grid is very large.
