Overview:
Power efficiency refers to the overall power utilization of the UPS, that is, the ratio of the UPS's externally absorbed power to the output power to the load. This value is closely related to the UPS power supply design line. The high-efficiency power supply can improve the efficiency of power consumption, and can reduce the power consumption and heat generation of the power supply to a certain extent. Generally, the power efficiency of an online UPS can generally reach more than 90%. If you need to add a large and medium capacity AC uninterruptible power supply equipment, it is best to use an online UPS with high power efficiency. The power efficiency of other UPS is about 80%. The EP harmonic absorption device can effectively protect the UPS from adverse effects on the electrical network.
The conversion efficiency is the ratio of the input power to the output power of the power supply: that is, the power conversion efficiency = the instantaneous output power provided by the power supply to the host / the instantaneous power of the input power supply × 100%. In general, PC power specifications have certain requirements for conversion efficiency. Initially, the power conversion efficiency is only about 60%. In Intel's ATX12V 1.3 power supply specification, the conversion efficiency of the power supply is specified to be no less than 68% at full load. In ATX 12V 2.01, higher requirements are placed on the conversion efficiency of the power supply- ─ Not less than 80%.
Variations in switching frequency, such as pulse frequency modulation (baked) with electronic filtering design, introduce many difficult inputs. Because there is no filter inductor, the output voltage is included on both ends of the attack and defense. Designers choose low rectifier diodes for rated voltage diodes. The power switch tube refers to a triode that can withstand large current, has small leakage current, and has good saturation conduction and cut-off characteristics under certain conditions, and can not consider its amplification performance. Its control is related to the magnitude or direction of the base current. Through the collector and emitter, the direction depends on whether it is an NPN or a PNP tube. Field effect transistors are generally used for electronic switches, and control is related to polarity. Therefore, when purchasing a power supply, you can get a general idea of ​​the power conversion efficiency from the power supply specifications it follows. However, when the load current increases and the burden of loss of inductance and capacitance is lacking, the load resonance technique is not suitable for high output current and low voltage. On the other hand, the voltage conversion technique uses a parasitic composition that is only one step away from the resonant characteristics of the antenna that switches the circuit switched on and off.
Crazy is due to the characteristics of PWM half-bridge inverter symmetry and simple configuration and zero voltage switching (zero voltage), using zero voltage conversion technology is one of the most common topologies. Due to analysis and design, and output power inductors, asymmetric half-bridge inverters are typically used for PWM high output current and low voltage applications such as computer and server power. An example of this crazy current amplifier and synchronous rectifier asymmetric half-bridge inverter and common features, some experimental results, samples for asymmetric topology power switch control.
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