Usually we use waveform analysis to analyze the rectifier circuit. The so-called waveform analysis method is based on the power supply voltage u2 and the control angle a and the nature of the load, and the load voltage ud, the load current id, and the voltage and current waveform diagrams of the rectifying elements are derived, thereby deriving the calculation formula and the quantitative relationship of the basic electric quantity.
The specific steps are:
1. Draw the schematic diagram of the main circuit and mark the power and component serial numbers;
2. Draw a phase (line) voltage waveform diagram to determine the natural commutation point;
3. Draw a trigger pulse at the corresponding position according to the control angle a, and indicate the corresponding serial number;
4. According to the working principle of the controllable rectifier circuit, draw waveforms such as load voltage ud, load current id, and SCR current iT;
5. According to the waveform diagram, the calculation formula of the basic power is derived;
6. Comprehensive evaluation of the rectifier circuit. For example: the advantages and disadvantages of the circuit; the controllable phase shift range of the circuit; whether the load current is continuous; the maximum positive and negative voltage values ​​that the rectifier component is subjected to; the ripple factor gw and the ripple coefficient gm of the rectified voltage ud.
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