This is a regulated output voltage which is then given to the control circuit, which is a feedback circuit. The output signal from the switching section is again rectified and filtered, to get the required DC voltage. These are much efficient and hence the power conversion ratio is higher. The transformer used here are much smaller and lighter ones unlike the ones used for 60 Hz supply. Switching SectionĪ fast switching device such as a Power transistor or a MOSFET is employed in this section, which switches ON and OFF according to the variations and this output is given to the primary of the transformer present in this section. This unregulated dc is given to the central switching section of SMPS. This output will have many variations and the capacitance value of the capacitor should be higher to handle the input fluctuations.
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The AC input supply signal 50 Hz is given directly to the rectifier and filter circuit combination without using any transformer. Let us try to understand what happens at each stage of SMPS circuit. The working of SMPS can be understood by the following figure. The working of SMPS is simply understood by knowing that the transistor used in LPS is used to control the voltage drop while the transistor in SMPS is used as a controlled switch. are overcome by the implementation of Switched Mode Power Supplies. The disadvantages of LPS such as lower efficiency, the need for large value of capacitors to reduce ripples and heavy and costly transformers etc. But to overcome the disadvantages of Linear Power Supply system, the Switched Mode Power Supply (SMPS) is used. As the electrical noise is lower, the LPS is used in powering sensitive analog circuitry. In addition, they are also used in data acquisition and signal processing.Īll the power supply systems that needs simple regulation and where efficiency is not a concern, the LPS circuits are used. In spite of the above disadvantages, Linear Power Supplies are widely used in low-noise amplifiers, test equipment, control circuits. The block diagram of a Linear Power Supply is as shown in the following figure. We have already gone through different parts of a Linear Power supply.
![troubleshooting repairing switch mode power supplies ebook torrent troubleshooting repairing switch mode power supplies ebook torrent](https://www.cs.uic.edu/~spurohit/images/blinds2.png)
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The Linear Power Supply (LPS) is the regulated power supply which dissipates much heat in the series resistor to regulate the output voltage which has low ripple and low noise. This is the conventional method of obtaining DC out of the input AC supply. All these sections together make the Linear Power Supply. The topics discussed till now represent different sections of power supply unit.