The inverter converts DC power (battery, storage battery) into AC power (generally 220v50HZ sine or square wave). Emergency power supply generally inverts the DC battery into 220V AC.
Simply put, an inverter is an electronic device that converts low voltage (12 or 24 volts or 48 volts) direct current into 220 volts alternating current. Because we usually rectify 220 volt alternating current into direct current for use, and the inverter does the opposite, hence the name. We are in a “mobile” era, mobile office, mobile communication, mobile leisure and entertainment. When moving, people not only need low-voltage DC power supplied by batteries or batteries, but also need 220-volt AC power that is indispensable in our daily environment. Inverters can meet our needs.
A converter is an electrical device that changes the voltage, frequency, phase number and other quantities or characteristics of a power system. Including rectifiers (AC to DC), inverters (DC to AC), AC converters and DC converters. In addition to the main circuit (respectively, the rectifier circuit, the inverter circuit, the AC conversion circuit and the DC conversion circuit), the converter also needs a trigger circuit to control the on and off of the power switching element and a control circuit to realize the regulation and control of electric energy. The trigger circuit of the converter includes a pulse generator and a pulse output device. The former generates pulses of a certain frequency, a certain width or a certain phase according to the requirements of the control signal; the latter amplifies the level of this pulse into a driving signal suitable for the power switching elements in the converter. Trigger circuits can be divided into phase-controlled trigger circuits (used in controlled rectifiers, AC voltage regulators, direct frequency converters and active inverters,
chopper-controlled trigger circuits and frequency-controlled trigger circuits according to their control functions. The frequency control circuit using sine waves can not only control the output voltage of the inverter, but also improve the quality of the output voltage. The control circuit of the converter is divided into a loop control circuit and a closed-loop control circuit according to the control mode. The former is mainly used in some special equipment with low requirements; the latter has automatic control and adjustment functions and is widely used in various working machinery. According to the nature of the control signal, it is divided into analog control circuit and digital control circuit. Analog signals most commonly use DC voltage and current, which are easy to process and transform using electrical methods; digital signals are a set of signals whose information parameters have discrete values and discontinuous changes. Digital control has high precision, but the circuit is complex and expensive. Therefore, digital-analog hybrid control circuits are actually widely used. In addition, the use of microcomputer control circuits also has many advantages.
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