Analysis of the application of switching power supply in professional power amplifier

　　As we all know, the development of modern switching power supply technology is transforming traditional old electrical equipment on an unprecedented scale and has widely entered various fields of national economy and human life. It has the excellent qualities of high power density, small size, light weight, high efficiency, high reliability, low noise and low pollution, which greatly saves electric energy, reduces material consumption and cost, and significantly reduces electromagnetic interference. Just as the popular "inverter air conditioner", "refrigerator with more than 40% energy saving" in our daily life, and the common "arc welding, electrolysis, heating, charging, ultrasound, motor speed regulation" and other high-tech value-added products in industry are the result of using high-frequency switching power supply technology!

　　Let's review now: our modern high-frequency high-power switching voltage-stabilized power supply technology is actually a complex technology with a wide range of knowledge, a large span, high difficulty, and great risks. It can transform the strong and rough electricity provided by the power grid into high-stability precision electricity and fine electricity required by various electrical equipment and instruments, that is, provide voltage and current values ​​of different specifications. It is an important central power supply system in modern electronic equipment. Statistics show that nearly half of the common faults in electrical equipment are caused by power supply problems, which I think is not an exaggeration. Because the content involved in modern high-frequency switching power supplies spans multiple disciplines, such as intelligent control chip systems for microelectronics fine processing, and increasingly updated high-performance power devices and high-frequency transformer magnetic materials, amorphous and microcrystalline, etc., it is enough to prove the value of the high-tech content of this technology, which is beyond the reach of ordinary enterprises. Due to time constraints, I will not elaborate on it here.

The professional power amplifier switching power supply 　　I am talking about now is a new type of power supply that eliminates the large loop feedback of the modern high-frequency switching voltage-stabilized power supply, and eliminates the contradiction of insufficient power supply for the dynamic instantaneous output of the power amplifier caused by the sudden drop in the switching conversion rate caused by adjusting the switching pulse width due to the need for voltage stabilization. It is a newly developed patented technology FPA brand professional power amplifier dedicated switching power supply with no feedback, no voltage stabilization, and good floating load driving ability, which is the topic I am talking about today.

　　In addition to the above advantages, the "high-frequency switching power supply" specially matched with FPA professional power amplifier has a unique soft-on and soft-off and AC power factor correction (PFC) circuit unit, which absolutely eliminates the impact and pollution of the power grid caused by the switch, and increases the utilization rate of the AC power supply by more than 40%. The perfect protection circuit measures for over-voltage, under-voltage, overload, short circuit, etc. are also another highlight of this power supply. In addition, an intelligent voltage limiting circuit is also used to ensure that the machine completely eliminates clipping distortion under different loads (1Ω-16Ω) and different powers. In addition, the machine has a wide load range and can still work stably for a long time under a 2Ω load, so it has a wider adaptability. It also has a bridging function and an advanced temperature control system; what is more worth mentioning is that it also has the ability to automatically adapt to the sensitivity of the input signal of the whole machine (0dB~+20dB), and has a stronger adaptability to various sound sources. The maximum output power of this power supply is between 4000-5000W. At present, the highest DC voltage output of the power supply product is: ±75V, ±150V, and the single-side current is 30A, which fully meets the power supply of the second-order H-class professional power amplifier. The corresponding power amplifier output of this power supply is: 8Ω/85V, that is, 950W continuous effective power, 4Ω/70V, that is, 1200W continuous effective power. The corresponding company model of this amplifier is FPA brand CE1200, and the weight is only 1/4 of the traditional 2U chassis. Because the professional power amplifier using the switching power supply has many advantages, it represents the development direction of professional power amplifiers and is another excellent work of current professional power amplifiers.