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Tag: High frequency UPS

Analysis of Three Phase Single Switch Boost PFC Rectifier Controlled by Variable Frequency PWM

Analysis of Three Phase Single Switch Boost PFC Rectifier Controlled by Variable Frequency PWM

Posted on September 28, 2022September 28, 2022 by admin

In 1993, Ucecla et al. studied the three-phase single switch Boost PFC rectifier controlled by DCM mode variable frequency PWM with variable switching frequency fs. Its circuit is shown in Fig1-1. This is a single switch three-phase PFC rectifier circuit with Boost input inductance L. For the convenience of analysis, it is assumed that: ①…

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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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Transformerless UPS and high frequency UPS

Transformerless UPS and high frequency UPS

Posted on October 8, 2021December 31, 2021 by admin

⑴ Transformerless UPSTransformerless UPS is a high-frequency UPS without isolation function. It can completely use no transformer. Its typical circuit is shown in Figure 1. The circuit is composed of a three-phase IGBT Boost SPWM high-frequency switching rectifier and a three-phase half-bridge IGBTSPWM high-frequency inverter through a battery (consisting of 67 batteries in series, with…

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Definition, performance comparison and characteristics of high frequency UPS and industrial frequency UPS

Definition, performance comparison and characteristics of high frequency UPS and industrial frequency UPS

Posted on September 18, 2021September 18, 2021 by admin

Definition, performance comparison and characteristics of high frequency UPS and industrial frequency UPS People are accustomed to call the third and fourth generation UPSs as power frequency UPS and high frequency UPS respectively. However, the definition of these two UPSs is not yet unified. Let’s talk about the definition of industrial frequency UPS and high…

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The development direction of ups uninterruptible power supply

Posted on August 11, 2021December 30, 2021 by admin

The key to UPS’s uninterrupted power supply is the introduction of energy storage batteries. When the mains power is normal, the poor quality AC power of the mains power is rectified into DC power through the rectifier. On the one hand, this DC power is transformed into constant voltage and constant frequency high-quality AC power…

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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

  • Why two three-phase single switch Boost SPWMPFCs are used for interleaving
  • Fixed switching frequency and variable switching frequency PFC rectifier
  • Analysis of Three Phase Single Switch Boost PFC Rectifier Controlled by Variable Frequency PWM
  • Detailed explanation of harmonic injection three-phase boost single-switch SPWMPFC rectifier
  • Explanation of three super boost single open sky SPWM PFC 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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12-Phase Diode Rectifier Using Transformer-Injected Harmonics 12-phase rectification AC filter circuit Active filter Carrier triangle wave Cascade superposition of independent DC power supply Compensation for the influence of dead zone Composition of three-phase full-bridge SPWM inverter Development of inverter technology Double Fourier series analysis filtering principle of the DC side active filter High frequency UPS influence of dead zone on output voltage Influence of Input Transformer Connection on Harmonic Current Influence of unbalanced load on DC input current fluctuation Instantaneous space current phasor control method using hysteresis comparator Inverter technology Non-linear load Power frequency UPS PWM technology Rectifier SCR12 Phase Rectifier SCR polyphase phase controlled power frequency rectifier Simulation results of three-phase four-wire inverter Sinusoidal modulation wave space flux linkage phasor SPWM control method SPWM control technology SPWM soft-switching inverter technology The Composition and Principle of Mains Input Multiphase Rectifier Three-level SPWM control according to line voltage Three-level SPWM inverter Three-level SPWM wave Three-level SPWM waveform Three-phase half-bridge inverter Thyristor rectifier Two-level SPWM control according to the phase voltage waveform Two-level SPWM inverter Types of SPWM Types of spwm multilevel inverters Unbalanced load of inverter 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.