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Simple uninterrupted power supply (UPS) designed _

 
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PostWysłany: Wto 9:26, 05 Kwi 2011    Temat postu: Simple uninterrupted power supply (UPS) designed _

Simple uninterrupted power supply (UPS) design


A simple block diagram of the source as follows: Figure 1UPS simple block diagram of the various parts of the design 2UPS 2.1 Charger: The battery charge current with the charging rate of the change, this addition to battery-powered charger, but also to provide the inverter all the power it needs, so at least take the DC output current 4.5A. After the battery is fully charged, if not then the load will naturally discharge, which must continue to complement part of the natural discharge of charge, In addition, when power is restored after a power failure, it must both inverter and battery supply current, so the charge Used for forward transform of the switching regulator circuit is the basic work of the AC input 24V output power supply with the same difference is of no use MOSFET and bipolar transistor design with, MOSn is the voltage control device, only rely on a set carrier conductivity, while the bipolar transistor is a current control device, there are two carriers involved in conduction. Although the principle of the two different control devices, but the composition and methods of analysis in the form of the circuit are very similar. [Received] 20GO a 09 a】 9 [Author] Huang death will be ([973 I). Female, Jingmen VOCATIONAL AND TECHNICAL EDUCATION assistant Luo Wei (] 973 a). Male, Hunan, Hubei and Yang, assistant professor of Jingmen Technical College 2.2 157 Ⅵ battery options: set power to ensure that time was 10min, powered by two 12V batteries in series. As in the case of discharge 5A 10rain, the optional standard lead-acid batteries PE1.9-12R. Standard voltage 12V, about 890g, the initial maximum current 0.47A. 23 converter design: here, converter refers to the inverter. It consists of two transistors and the output transformer oscillation circuit composed of white. Square wave generation circuit and the part of the waveform is shown in Figure 2, Figure 3 shows. . ) I-a J (E, 0) (Vt, 0) ln (V canthal 1.0) I ['Ic! _1 Wide] I reverse bias reverse bias generating circuit hoard around 2 million Singapore 3 wave around the circuit with input voltage Uin, through the startup resistor Rc are starting current flowing through this current into the transistor, the base current, due to the flow of current through R, the current value of the smaller, so the pilot through, so from Uin by the output transformer coil, a collector current flows, and the input voltage Uin added to the coil. Therefore, in the Nf EMF coil to the flow of the base, in-state, and thus the flux density increases, the voltage of the transformer to be square-wave voltage, but the transformer to achieve magnetic saturation after the collector current immediately becomes large, the base relative to the base current of the tube less than life, then Nf induced voltage drop, so that T1 closing rapidly, while the coil in the Nf reverse polarity on the counter-electromotive force, T2 turns on, then, and just as , causing the reverse magnetic saturation, thus creating alternating voltage, as transformers, transistors, resistor selection can determine the utility of the RMS. The overall 24-uninterrupted power supply circuit, see page 17 with photos, map the parameters to the input voltage is AC 125V, AC 120V output voltage is calculated. The electrical equipment requires AC voltage greater than 120V, you can use to achieve the step-up transformer; If you need less than the 120V AC voltage, to achieve step-down transformer is used. 3 charging problem needing attention and later restored power 3.1 power supply, to the discharged battery charge current is not too large,[link widoczny dla zalogowanych], the initial maximum current of 0.47A, so the initial charge current should be selected In this figure below. 32 If you then switch on the battery with the AC power switch is not linked, then the power supply when not, the battery will still power to the converter, which we do not want. [
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