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Tag: Power frequency UPS

Comparison of multi-superrectifier characteristics and the influence of load dual-input PF

Comparison of multi-superrectifier characteristics and the influence of load dual-input PF

Posted on June 16, 2022June 16, 2022 by admin

In the power frequency UPS, the commonly used SCR polyphase phase-controlled rectifier is a 12-phase two-phase superimposed rectifier, and the 18-phase three-phase superimposed rectifier and the 24-phase four-phase superimposed rectifier may be used. Their characteristic values ​​are compared in Table 1. It can be seen from this table that when the UPS is working at…

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The development process of ups uninterruptible power supply

Posted on August 3, 2021August 11, 2021 by admin

Since the advent of static UPS in the 1970s, from the initial SCR discrete UPS development to today’s use of fully-controlled power devices, the intelligent UPS has gone through a total of 40 years. During these 40 years, UPS has been It is developing in the direction of reducing volume and quality and improving performance…

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Recent Posts

  • Comparison of multi-superrectifier characteristics and the influence of load dual-input PF
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  • What is a 12-phase diode rectifier with transformer injected harmonics?
  • The working principle of the harmonic type SCR phase-controlled 12-phase rectifier

Categories

  • Basic knowledge of IGBT three-phase SPWM inverter
  • Basic knowledge of uninterruptible power supply
  • SCR polyphase phase controlled power frequency rectifier and three-phase boost single switch SPWM PFC rectifier

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AC filter circuit backup UPS Basic circuit of single-phase PWM inverter Basic structure of IGBT Cascade superposition of independent DC power supply Compensation for the influence of dead zone Composition of three-phase full-bridge SPWM inverter computer power Control method of the three-phase four-leg inverter current crest factor Development of inverter technology Double Fourier series analysis High frequency UPS industrial frequency UPS influence of dead zone on output voltage Influence of unbalanced load on DC input current fluctuation Instantaneous space current phasor control method using hysteresis comparator Inverter technology mains grid nature of the load Power frequency UPS power supply quality issues Precautions for using SCR PWM technology SCR multi-phase phase controlled rectifier SCR power switch time single phase capacitor filter rectifier space flux linkage phasor SPWM control SPWM control method SPWM modulation waveform SPWM soft-switching inverter technology Synchronous SPWM modulation The third generation UPS Three-phase half-bridge inverter Thyristor rectifier Transformer in UPS Two-level SPWM inverter Types of spwm multilevel inverters UPS applications Use gate resistance to control IGBT switch Various control methods of ups Working principle of the three-phase four-leg inverter Working principle of three-phase full-bridge SPWM inverter Working principle of three-phase half-bridge SPWM inverter
ups uninterruptible power supply is a UPS power supply that contains energy storage devices, which can be classified according to the characteristics of transformers and the structure of ups electrical circuit.