Transformerless power supplies: purpose, features, principle of operation of the device

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2018-04-02 02:55:07

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Power supply Units for personal computers are being built without a transformer connection scheme to the network (in fact, it is the pulse power supply device). They are characterized by high efficiency, small dimensions and low weight. However, the transformerless power supply has a significant drawback - interference pulses that have a negative impact on other schemes, PC and other consumer electronic devices. So each such product is being seriously tested for electromagnetic compatibility with other equipment. In addition, transformerless power supply is not galvanically isolated in the part of electrical circuitry from supply voltage. This, in turn, requires the use of special security measures during the repair of such products.transformerless power supply

Transformerless power supply: main functional parts

The Device consists of the following components:

- network rectifier;

- noise filter;

schema trigger,

- capacitive filter;

- voltage Converter-based pulsed power inverter;

- the chain of formation of the output voltage;

- the scheme of management;

- chain formation and transfer feedback signals to the control circuit.universal power supplies

Additional items

Depending on the model and functionality, transformerless power supply may contain additional diagrams, such as a linear regulator in discrete or integrated design, overload protection on the input and output voltage and current and anti-interference circuit. In addition, these BP may enter the scheme for the formation of special control signals that provide coordination of work of the device with the supplied schema.

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Working Principle

Universal Pulse power supply for obtaining a DC voltage realize the triple transformation of the input voltage. First, it is rectified and smoothed. The result is a DC voltage, then there is the formation of rectangular pulses with a frequency component of tens of kilohertz. Thereafter, the resulting pulses transformirovalsya on the secondary side with an appropriate factor, and again there is a straightening and smoothing. The master node transformerless power supplies are a key voltage converters, first and foremost, their power part (output stage of high power). These cascades can be divided into single-cycle and two-stroke.regulated power supplies

Regulated power supply

To adjust the value of the output voltage in transformerless devices often use a technique of pulse-width modulation, which is to change the duration of pulses and pauses between them. Thus, the frequency of conversion remains unchanged. Ratio between such quantities as the pause duration and the pulse depends on the value of the output voltage. It is automatically changed to maintain the output voltage within the specified value.


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Alin Trodden - author of the article, editor
"Hi, I'm Alin Trodden. I write texts, read books, and look for impressions. And I'm not bad at telling you about it. I am always happy to participate in interesting projects."

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