Why doesn't the power amplifier use switching power supply
Compared with the traditional linear regulated power supply, the closed power supply has many advantages, such as high conversion efficiency, high voltage and load stability, small size, light weight, etc., which can be clearly seen from the comparison of the items listed in the attached table. But in the high-end audio power amplifier, whether it is domestic or imported, why not use switching power supply? This article will talk about the author's opinion on this issue and discuss it with you. In the early 1980s, some foreign companies also used switching power supplies in power amplifiers, but they all gave up one after another. It is said that it is difficult to solve the electromagnetic interference of the switching power supply, and the large ripple is easy to cause problems such as sound dyeing. In the power amplifier, we hope that the power supply of the amplifier is a constant voltage source (this is one of the reasons why some enthusiasts like to use batteries to power the power amplifier), so that it is not easy to produce clipping distortion when dealing with large dynamic signals. Of course, it is not easy to make the power supply an approximate constant voltage source in actual production. Since the dynamic response of the linear regulated power supply is faster than that of the switching power supply, and the generated ripple is smaller than that of the switching power supply, from these two aspects, the linear regulated power supply is better than the switching power supply. In addition, the electromagnetic interference of switching power supply is greater than that of linear regulated power supply, which is more likely to deteriorate the sound quality and reduce the signal-to-noise ratio. From this aspect, it is not as good as using linear regulated power supply. Before analyzing the switching power supply that is prone to electromagnetic interference, let's understand some related concepts of switching power supply and linear regulated power supply.
Switching power amplifier restarts repeatedly
The power supply is broken. The power supply is unstable.
The second is to check on the DCDC power management side. However, there is basically no maintenance value.
The power amplifier uses a ring cow and a switching power supply, which has fewer faults
The power frequency transformer (including the ring cow) has a simple structure and a simple circuit. Compared with a switching power supply with a complex circuit, the failure rate should be lower. The failure rate of a good switching power supply is also very low, which is only relatively speaking.
