Provide knowledge of UPS uninterruptible power supply, understand the classification of UPS uninterruptible power supply and UPS electrica Circuit, etc.
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…
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…
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…
(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…
Through the previous article, we know what PWM pulse width modulation technology is, then in this article, we will talk about the advantages of PWM pulse width modulation technology when used in voltage-type inverters. ① The main circuit device for voltage control can be omitted, and the output voltage and output frequency can be adjusted…
PWM pulse width modulation technology (Pulse Width Modulation, PWM) refers to the use of a reference wave (usually a sine wave, sometimes a trapezoidal wave or a sine wave or square wave injected with zero sequence harmonics) as a modulating wave (Modulating Wave) ), and F (F is the carrier ratio) times the frequency of…
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…
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…
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…
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…