Pure Sine Wave Inverter With Solar Energy

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As the two most basic components, resistors and capacitors are widely used in circuit design, and can achieve filtering, phase shifting, and step-down functions. This should be viewed separately according to the specific situation. Three commonly used functions are described below.

One of the functions: filtering

The characteristic of the capacitor is that the voltage at both ends cannot change abruptly, and it has the characteristic of hindering the rate of change of the voltage. This can be used to achieve filtering and smooth the output signal. Taking the NTC temperature measurement circuit as an example, the actual circuit is shown in the figure below.

The resistance of the NTC changes with the change of temperature. The single-chip microcomputer collects the voltage at both ends of the resistance to calculate the current ambient temperature. A capacitor is connected in parallel at both ends of the resistance, which can play a filtering role and make the output smoother and will not appear too large. fluctuation.

The second role: phase shift, filter

When designing an operational amplifier circuit, we will connect a capacitor in parallel with the feedback resistor at its feedback end. The resistor plays the role of adjusting the magnification, and is connected in parallel with the capacitor to form the role of a low-pass filter and the role of phase compensation to prevent self-excitation from increasing the zero point.

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