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Input Considerations
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From XP Power
It is important to confirm the AC voltage, frequency, and phase when selecting a power supply as these differ from region to region. If more than the specified level of voltage is applied, the power supply can be damaged. If the input voltage has a distorted wave, the unit will either not operate normally or will suffer a shortened life time. When a large value inductor is used as an input line filter or choke, a back emf can be generated when the supply is switched off. A high voltage can be applied to the input stage causing stress and damage to the power supply. For a switched mode psu even if the input voltage remains sinusoidal, the input current will be very distorted, with large peak values due to the charging of the main bulk capacitor. This distorted current waveform results in low input power factors. Further, a large ripple current will flow in the filter capacitors. Products & Services
Power rectifiers are electrical devices that convert alternating current (AC) to direct current (DC). They are an integral part of telecom rectifiers for the telecommunications industry, and in battery chargers, DC power systems, and other power system devices.
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Linear power supplies accept AC inputs and provide one or more DC outputs for a wide variety of computer and industrial applications. They use an active element (normally a power transistor) operating in its linear region to generate a desired voltage.
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Switching power supplies are DC sources that use a switching element (normally a power transistor) to generate the desired voltage. Switching power supplies are also called switch-mode products or switching mode power supplies (SMPS).
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Power supplies are devices that produce AC or DC power. This grouping includes current sources, DC power supplies, AC-DC adapters, DC-DC converters, AC power sources, and DC-AC inverters.
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Specialty or proprietary products and accessories related to power supplies.
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Topics of Interest
8.1 Power Factor Correction
Power factor correction, or PFC, is a term used with AC mains powered circuits. A good power factor is when the AC current is in phase with the AC voltage. A pure...
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When a low DC voltage source is used to power circuitry operating at high voltage levels, a step-up (boost) converter can be used. The input (lower voltage) is utilized to charge a passive component,...
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Much of the current resonant converter development effort seems to be
for half-bridge topologies, which will now be considered. The following
discussion is based on a classic article by R.
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A rectified voltage (or current) is a voltage with a DC value not equal to zero and without any change in polarity. A pure sine wave has a DC (or average) value of zero because the signal...
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5.1 Introduction
The analysis of the rectifier with capacitive load is a classical case of a 'circuit determined' switching function. The switching instances are circuit determined and they must be...
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