There are two types of inverters, square wave inverters […]
There are two types of inverters, square wave inverters and sine wave inverters. Although square wave inverters have simple structure and low cost, they are not suitable for inductive and capacitive circuits due to too many harmonics. The price of sine wave inverters on the market is generally high, which makes it difficult for some users to accept, thus restricting its promotion and application.
Sine wave pulse modulation is the key to sine wave inverters. They all need a sine wave generator. The sine wave generated by it is compared with the triangular wave (sawtooth wave) to realize sine wave modulation. There are many methods and ways to generate sine waves. There are two types of commonly used methods: analog and digital, which are implemented in different ways. For example, a sine wave oscillator circuit composed of a filter circuit and a positive feedback amplifier is the most commonly used classic circuit, but the adjustment is more complicated and the frequency accuracy is not high. There are also methods such as function generators to generate sine wave circuits. A sine wave pulse width modulation circuit composed of a large-scale application-specific integrated circuit and a single-chip microcomputer. Using EPROM and D/A conversion to generate a reference sinusoidal voltage is also a common method. Using DSP high-speed data processor to achieve pulse width modulation is the latest method. Due to the introduction of computer technology, a lot of software development and design work needs to be increased. Although the circuit complexity and cost have increased, it is indeed a big An excellent design method for capacity inverters.
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