Application of Switching Power Supply in Professional Power Amplifier
As is well known, the development of modern switch mode power supply technology is transforming traditional old electrical equipment on a large scale, widely entering various fields of national economy and human life. It has excellent qualities such as high power density, small size, light weight, high efficiency, high reliability, low noise, and low pollution, greatly saving electricity, reducing material consumption and costs, and significantly reducing electromagnetic interference. Just like the popular high-tech value-added products in our daily lives such as "variable frequency air conditioners", "refrigerators that save more than 40% of energy", and common industrial products such as "arc welding, electrolysis, heating, charging, ultrasound, and motor speed regulation", it is the result of using high-frequency switching power supply technology!
The professional power amplifier switch power supply I am talking about now is a new type of power supply that eliminates the contradiction of insufficient power supply for the dynamic instantaneous output of the power amplifier due to the need to adjust the switch pulse width caused by the need for voltage stabilization, by removing the large loop feedback on the basis of modern high-frequency switch stabilized power supply. It is a newly developed technology FPA brand professional power amplifier dedicated switching power supply with no feedback, no voltage regulation, and good floating load driving ability, which is the theme I will talk about today.
In addition to the above advantages, the FPA professional amplifier specialized matching "high-frequency switching power supply" also has a unique soft on/off and AC power factor correction (PFC) circuit unit, which eliminates the impact and pollution of the switch on the power grid, and increases the utilization rate of AC power supply by more than 40%. The comprehensive protection circuit measures for overvoltage, undervoltage, overload, short circuit, etc. are also another highlight of this power supply. In addition, an intelligent voltage limiting circuit is adopted to ensure that the machine completely eliminates clipping distortion under different loads (1 Ω -16 Ω) and powers. Also, the machine has a wide load range and can still operate stably for a long time under a 2 Ω load, making it more adaptable. It also has bridging function and advanced temperature control system; It is worth mentioning that it also has automatic adaptability to the sensitivity of the input signal of the whole machine (0dB~+20dB), and has stronger adaptability to various audio sources. The maximum output power of this power supply is between 4000-5000W. Currently, the power supply products output high DC voltage of ± 75V, ± 150V, and single-sided current of 30A, fully meeting the power supply of second-order H-class professional amplifiers. This power supply corresponds to amplifier outputs of 8 Ω/85V, which is 950W continuous effective power, and 4 Ω/70V, which is 1200W continuous effective power. The corresponding company model of this amplifier is FPA brand CE1200, and its weight is only a traditional 1/4, 2U chassis. Due to the numerous advantages of using switch power supplies in professional amplifiers, it represents the development direction of professional amplifiers and is another masterpiece of current professional amplifiers.
