BOOK_CONTENT
From Digital Power Electronics and Applications

As described in Chapter 3, all DC/AC pulse-width-modulation (PWM) inverters are treated as a first-order-hold (FOH) element in digital control systems. We will discuss this model in various circuits in this Chapter.

6.1 INTRODUCTION

DC/AC inverters are a newly developed group of the power switching circuits applied in industrial applications in comparison with other power switching circuits. Although choppers were popular in DC/AC power supply long time ago, power DC/AC inverters were used in industrial application since later 1980s. Semiconductor manufacture development brought power devices, such as gate turn-off thyristor, Triac, bipolar transistor, insulated gate bipolar transistor and metal-oxide semiconductor field effected transistor (GTO, Triac, BT, IGBT, MOSFET, respectively) and so on, in higher switching frequency (say from thousands Hz upon few MHz) into the DC/AC power supply since 1980s. Due to the devices such as thyristor (silicon controlled rectifier, SCR) with low switching frequency, the corresponding equipment is low power rate.

Square-waveform DC/AC inverters were used in early ages before 1980s. In those equipment thyristors, GTOs andTriacs could be used in low-frequency switching operation. High-frequency/high-power devices such as power BTs and IGBTs were produced in the 1980s. The corresponding equipment implementing the PWM technique has large range of the output voltage and frequency, and low total harmonic distortion (THD). Nowadays, most DC/AC inverters are DC/AC PWM inverters in different prototypes.

DC/AC inverters are used for inverting DC power source into AC power applications. They are generally used in following applications:

  1. Variable voltage/frequency AC supplies in adjustable speed drives...

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Switching Power Supplies
Switching power supplies are DC sources that use a switching element (normally a power transistor) to generate the desired voltage. Switching power supplies are also called switch-mode products or switching mode power supplies (SMPS).
Power Supplies
Power supplies are electrical devices that deliver electric power to one or several loads. They generate the output power by converting an input signal into an output signal.
Solar Inverters
Solar Inverters or Photovoltaic (PV) Inverters are electrical devices that convert the direct current (DC) produced by a PV device (cell or array) into alternating current (AC).
Digital-to-Analog Converter (DAC) Chips
Digital-to-analog converter (DAC) chips convert digital signals that represent binary numbers into proportional analog voltages.

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