3 phase online ups uninterruptible power supply electrical Circuit knowledge
Provide knowledge of UPS uninterruptible power supply, understand the classification of UPS uninterruptible power supply and UPS electrica Circuit, etc.
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…
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…
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…