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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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Detailed explanation of harmonic injection three-phase boost single-switch SPWMPFC rectifier

Detailed explanation of harmonic injection three-phase boost single-switch SPWMPFC rectifier

Posted on July 20, 2022July 20, 2022 by admin

For the constant switching frequency and constant on-time (Ton) SPWMPFC rectifier introduced earlier, the 5th harmonic content of the mains input current is still on the high side. In 1995, Q. Huang proposed a variable control method of Ton. The method is to inject the 6th harmonic to change the duty cycle d, so as…

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three super boost single open sky SPWM PFC rectifier

Explanation of three super boost single open sky SPWM PFC rectifier

Posted on July 15, 2022July 15, 2022 by admin

In order to reduce input current harmonics and improve input power factor, a.r.prasad proposed a three-phase boost single switch SPWM PFC rectifier circuit in 1987, as shown in Figure 1-1. S in the figure is a single tube control switch, l is the input boost energy storage inductance, CD is the DC filter capacitor, and…

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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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Figure 4 - Test waveforms considering the presence of harmonics in the mains voltage

Application of 12-phase rectifier and passive and active filter in UPS

Posted on June 11, 2022June 11, 2022 by admin

Most of the SCR polyphase phase-controlled rectifiers used in three-phase high-power power frequency UPS use 12-phase rectifiers or 12-phase rectification + 11th harmonic passive filters, which have become a typical power frequency UPS circuit mode, which can Meet the requirements of the national standard GB/T 7260.3 for the harmonic content of the mains input current….

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Influence of Input Transformer Connection on Harmonic Current

Influence of Input Transformer Connection on Harmonic Current

Posted on June 1, 2022June 1, 2022 by admin

The variable amplitude 12-phase two-superimposed rectifier is the most widely used in UPS. When the harmonic injection technology is adopted, its application will be wider. For this reason, we will briefly introduce the influence of the input transformer on the harmonic current. Provide time reference. There are two ways to connect the main circuit of…

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What is a 12-phase diode rectifier with transformer injected harmonics?

What is a 12-phase diode rectifier with transformer injected harmonics?

Posted on May 20, 2022May 20, 2022 by admin

This time, we introduce a 12-phase diode rectifier technology that uses transformers to inject harmonics, which can make 12-phase diode rectifiers become 24-phase diode rectifiers to improve the input power factor of mains power. The harmonic injection circuit is composed of an injection transformer and a single-phase rectifier bridge. The circuit utilizes the characteristic that…

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The working principle of the harmonic type SCR phase-controlled 12-phase rectifier

The working principle of the harmonic type SCR phase-controlled 12-phase rectifier

Posted on May 9, 2022May 9, 2022 by admin

In order to further improve the mains input power factor of the SCR polyphase phase-controlled power frequency rectifier, reduce the waveform distortion rate THDi of the mains input current to less than 10%, and make the mains input current and the mains input voltage in the same phase, there is a A simple and effective…

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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.