Filtering a Switched Power Supply

As seen in the previous post, a simple switch or diode rectified output is still not a clean DC signal. The waveform contains AC components on top of the DC offset. The simplest methods for smoothing this output involve filtering through the use of passive storage elements such as capacitors or inductors. In essence, these components tend to smooth the […]

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Important Variables and Notation

In a power electronic system, several electrical quantities are of special interest. Efficiency has already been identified in previous posts. Maximum values of currents and voltages will be needed to determine the necessary device ratings. Energy flow is the underlying objective, and power and energy levels in each part of the system are very important. We are most interested in […]

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Power Electronics Summary and Future Developments

Much of the historical discussion in previous posts have described the special semiconductors used for power conversion circuits. The special energy processing applications addressed by power electronics have also been described. Not long ago, the devices were in many ways the limiting factor in converter design. The fast pace of change in devices has brought about entire new families of […]

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Power Electronics in Practice

The field of power electronics is relatively new as a distinct discipline, even though the applications and fundamental methods of a long history. As a special electrical engineering practice, it dates from about the time the SCR was introduced. The term was coined about 1970 to describe the subject as a cohesive discipline. Engineers active in power electronics are typically involved […]

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Power Supplies and DC-DC Conversion

Power supply circuits for radios, portable communications, television sets, and son on, are a commonplace although often neglected element of electrical equipment. This application dominates the power electronics industry in many ways, because of the huge quantities involved. Some typical supplies intended as components of larger systems are illustrated below. The earliest power supplies for vacuum tube electronics were rectifiers, […]

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