Class of common DC regulated power supply and its choice method

　　Author ：Iflowpower – Portable Power Station Supplier

The advancement of human society is inseparable from all walks of life, and the update of various electronic products will not open our designer's efforts. In fact, many people will not understand the composition of electronic products, such as DC. Power Supply.

Stabilized power supply has many classification methods. According to the type of output power supply, there is a DC voltage regulator power supply and AC regulator power supply. According to the connection method of the regulator circuit and the load DC regulated power supply, it can be divided into series stadeling power and parallel power supply.

According to the operating state of the adjustment tube, there is a linear adjustment of the power supply and switch to adjust the power supply. According to circuit type, there is a simple voltage regulated power supply and feedback regulator power supply, etc. Such a variety of classification methods usually make the beginners feel confused and want to know where to start.

In fact, it should be said that these seemingly varied classification methods have certain correlations, as long as this correlation is clarified, the type of power supply can be distributed naturally. Since we are talking about the classification of regulated power, we should first understand the output of the power supply is output DC or alternating electricity. In this way, the first layer came out.

First, you should classify according to the output type of the power supply. The next classification is more troublesome. Is it classified according to the operating state of the regulator circuit and the load connection method or the adjuster? In fact, if you understand the electronic device around us, there will be two differences in the actual application of the stable power supply.

A wide variety of linear regulated power supplies, are widely used in a variety of relatively simple electronic devices, such as radios, small speakers, etc .; one is widely used in various complex electronic devices, such as large screens Color TV, microcomputer, etc. In this way, we can classify the second level according to the operating state of the adjustment tube.

The next third class class is classified according to the regulator circuit and the load connection mode. Since the characteristics of a variety of different circuits are too large, further subdivision is not easy to general, and should be classified according to the characteristics of each particular class. DC voltage regulator power supply can be divided into chemical power supplies, linearly stable power and switch type stable power supplies, which have various types: chemical power supply we usually use dry batteries, lead-acid batteries, nickel-cadmium, nickel-hydrogen, lithium ions Battery belongs to this, each has its own advantages.

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One common feature of linear regulated power supply linear regulated power supply is its power device regulator tube in linear area, relies on the pressure drop between the regulator tube to stabilize the output. Since the electrostatic loss of the adjustment tube is large, it is necessary to install a large heat sink to heat. Moreover, since the transformer operates in the power frequency (50 Hz), the weight is relatively large.

The advantages of this power supply are high stability, small ripple, high reliability, easy to make multi-channel, and sustainable output. The disadvantage is that it is large, cumbersome and the efficiency is relatively low. This stable power supply has many kinds.

From the output nature, it can be divided into a regulated power supply and a steady-state current power supply, as well as the voltage stabilization and steady current (dual steady) power supply integrated with voltage stability and steady state flow. In terms of output value, it can be divided into fixed-point output power supply, band switch adjustment and potentiometer continuous adjustment type. From the output instructions can be divided into pointer indication type and digital display type, etc.

Switch-type DC voltage regulator power supply and linear stable power supply are different stable power supplies to switch-type DC stabilization power supplies. Its circuit type is important including single-ended flying, single-ended, half-bridge, push-pull and full bridge. It is the fundamental difference between the linear power supply that its transformer does not work at work frequencies, but working at a few tens of kilohertz to several megabottomes.

The function tube does not work in a saturation and cutoff area (ie, the switch state); the switching power supply is named. The advantage of the switching power supply is small, light weight, stable and reliable; disadvantage is that the ripple is greater than the linear power supply (usually ≤1% Vo (PP), good ripple may exceed 10mV (PP) or less). Its power range can be from a few watts to thousands of tiles.

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