POWER SUPPLY ELECTRONICS PDF DOWNLOAD!
Power is the backbone of any electronic system and the power supply is what feeds the system. Choosing the right supply can be the critical difference between. Power supplies or power supply units, PSU, form an essential part of very many items of electronics equipment. The most common form takes in AC power from the mains supply and delivers a DC voltage to the item requiring power. Find great deals on eBay for Electronic Power Supply in Ham Radio Power Supplies. Shop with confidence.
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Switched-mode power supplies are usually power supply electronics, and to keep the output voltage constant, the power supply employs a feedback controller that monitors current drawn by the load.
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The switching duty cycle increases as power output requirements increase. SMPSs often include safety features such as current limiting or a crowbar circuit to help protect the device and the user from harm.
PC power supply electronics supplies often provide a power good signal to the motherboard; the absence of this signal prevents operation when abnormal supply voltages are present. Some SMPSs have an absolute limit on their minimum current output.
In a no-load condition the frequency of the power slicing circuit increases to great speed, causing the isolated transformer to act as a Tesla coilcausing damage due power supply electronics the resulting very high voltage power spikes.
Switched-mode supplies with protection circuits power supply electronics briefly turn on but then shut down when no load has been detected.
A very small low-power dummy load such as a ceramic power resistor or watt light bulb can be attached to the supply to allow it to run with no primary load attached. The switch-mode power supplies used in computers have historically had low power factors and have also been significant sources of line interference due to induced power line harmonics and transients.
In simple switch-mode power supplies, the input stage may distort the line voltage waveform, which can adversely affect other loads and result in poor power power supply electronics for other utility customersand power supply electronics unnecessary heating in wires and distribution equipment.
Furthermore, customers incur higher electric bills when operating lower power factor loads. To circumvent these problems, some computer switch-mode power supplies perform power factor correction, and may employ input filters or additional switching stages to reduce line interference.
Linear regulator[ edit ] The function of power supply electronics linear voltage regulator is to convert a varying DC voltage to a constant, often specific, lower DC voltage. In addition, they often provide a current limiting function to protect the power supply and load from overcurrent excessive, potentially destructive current.
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Typically the input transformer provides a step down function. It also isolates the output circuit from the power supply electronics supply. The power supply rectifier converts the incoming signal from an AC format into raw DC.
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Either half wave or more commonly full wave rectifiers may be used as they make use of both halves of the incoming AC signal.
The raw DC from the rectifier is far from constant falling power supply electronics zero power supply electronics the AC waveform crossed the zero axis, and then rising to its peak.
The addition power supply electronics a reservoir capacitor here fills in the troughs in the waveform, enabling the next stage of the power supply to operate. Large value capacitors are normally used within this stage.
This stage of the power supply takes the smoothed voltage and uses a regulator circuit to provide a constant output virtually regardless of the output current and any minor power supply electronics in power supply electronics input level.
Power supply regulation There are two basic forms of power supply used in electronics equipment: This form of power supply was the only type used many years ago. The Load current drawn from the supply output. To do these things the basic PSU has four main stages, illustrated in Fig.
Power Supply Basics
Modern power supplies have also increased greatly in their complexity, and can supply very stable output voltages controlled by feedback systems. Many power supply circuits also contain automatic safety circuits power supply electronics prevent dangerous over voltage or over current situations.
Each type of building block and power supply is covered in greater detail on other pages on this website.