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Category: Basic knowledge of uninterruptible power supply

the following will learn basic knowledge of uninterruptible power supply

Fixed switching frequency and variable switching frequency PFC rectifier

Why two three-phase single switch Boost SPWMPFCs are used for interleaving

Posted on September 30, 2022September 30, 2022 by admin

The THDi value of the mains input current can also be reduced by interleaving two three-phase Boost single switch SPWMPFC rectifiers, as shown in Figure 1-1.The idea of this interleaving is to make these two three-phase single switch PFC circuits work as close to the critical state of DCM and CCM as possible, and then…

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Fixed switching frequency and variable switching frequency PFC rectifier

Fixed switching frequency and variable switching frequency PFC rectifier

Posted on September 29, 2022September 29, 2022 by admin

Comparison of Fixed Switching Frequency and Variable Switching Frequency PFC RectifiersFor convenience, the input current at fixed switching frequency is also represented by phase voltage, that is, M ‘=√ 3M instead of M, as shown in Figure 1-1 From the average value equation of current ia at constant switching frequency and variable switching frequency, the…

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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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What is the control technology of UPS?

What is the control technology of UPS?

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

This site uniformly uses SPWM control technology for introduction for two reasons: one is to facilitate the comparison of different schemes; the other is because it is the most basic control technology. Other control technologies are derived from SPWM control technology. With the development of control theory and functional technology, various microcontrollers with excellent performance…

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Selection of Switching Devices for UPS

Selection of Switching Devices for UPS

Posted on November 16, 2021March 17, 2022 by admin

Switching devices for UPS should be selected based on the following factors: switching frequency, switching capacity, switching voltage and current, etc. The switching frequency should be considered first. Figure 1 shows the capacity range and operating frequency of various switching devices. When making a specific selection, you should first determine the switching frequency of the…

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What is an insulated gate bipolar transistor?

What is an insulated gate bipolar transistor?

Posted on November 10, 2021November 10, 2021 by admin

Insulated Gate Bipolar Transistor (IGBT) is a composite power switching device that combines power MOSFET and bipolar power transistor. It not only has the advantages of fast switching speed of MOSFET, high input impedance, low driving power and simple driving circuit, but also the advantages of large capacity and high blocking voltage of high-power bipolar…

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Main parameters and precautions of Silicon controlled rectifier

Main parameters and precautions of Silicon controlled rectifier

Posted on November 4, 2021March 17, 2022 by admin

Silicon controlled rectifier (SCR), also called thyristor, is the earliest semi-controlled switching device used in power electronics. ①The main parameters of SCR(1) Off-state repetitive peak voltage UDRM.UDRM refers to the maximum off-state pulse voltage with an open gate, the repetition rate is 50 times per second, and the duration of each time is not greater…

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Working conditions and volt-ampere characteristics of thyristors

Working conditions and volt-ampere characteristics of thyristors

Posted on October 28, 2021October 28, 2021 by admin

Thyristor is also called silicon controlled rectifier (SCR), the following is described as SCR (1) Working conditions of SCR. Because SCR has only two working states of on and off, it has switching characteristics. This characteristic requires certain conditions to be transformed. Such conditions are shown in Table 1. ① When the SCR bears the…

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Structure and working principle of silicon controlled rectifier

Structure and working principle of silicon controlled rectifier

Posted on October 22, 2021October 28, 2021 by admin

There are two main types of switching devices used in modern UPS, namely Thyristor (SCR) and IGBT. SCR is mainly used in multi-phase phase-controlled rectifiers and bypass switches. Let’s talk about the Thyristor (SCR) Thyristor (SCR), also called silicon controlled rectifier, is the earliest semi-controlled switching device used in power electronics. It is a four-layer…

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SPWM modulation wave and SPWM pulse width modulation

SPWM modulation wave and SPWM pulse width modulation

Posted on October 18, 2021October 18, 2021 by admin

(1) Characteristics of SPWM modulation waveThe rectifier and inverter in the UPS adopt SPWM control, and the obtained SPWM modulated wave has the following four characteristics.①The SPWM modulation waveform can be turned into a numerically stable quasi-sine wave waveform②By moving the phase of the sinusoidal modulation wave us, the phase of the SPWM modulation wave…

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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.