Types of DC regulated power supplies and their selection:
Regulated power supply classification methods, according to the type of output power supply DC regulated power supply and AC regulated power supply; according to the connection between the regulated circuit and the load DC regulated power supply series regulated power supply and parallel regulated power supply; according to the operating state of the adjustment tube linear regulated power supply and switching regulated power supply; according to the type of circuit is divided into a simple regulated power supply and feedback-type regulated power supply, and so on. So many ways to categorize the beginner often puzzled, do not know where to start. In fact, it should be said that these seemingly numerous classification methods have a certain hierarchical relationship between, as long as the level of natural can be divided into clear power supply categories.
Since we are talking about the classification of regulated power supply, then first of all, it should be clear what the output of the power supply, is the output of direct current or output alternating current. Thus the first level comes out, the first should be categorized according to the type of output of the power supply. The next classification is going to be a bit of trouble, is it classified according to the way the voltage regulator circuit is connected to the load or classified according to the operating state of the regulator tube? In fact, understand the electronic equipment around us will find that the actual application of regulated power supply there are two very different types, one is a variety of relatively simple electronic equipment in the widespread use of linear regulated power supply, such as radios, small stereos, etc.; a variety of complex electronic equipment in the widespread use of switching regulated power supply, such as large-screen color TVs, minicomputers, etc.. So it seems that the second level of classification we can be classified according to the operating state of the regulator. The next third level of classification is based on the connection between the voltage regulator circuit and the load to be classified. Subdivided further down due to a variety of different circuit characteristics are too different, it is not good to generalize, should be classified according to the characteristics of each specific category to distinguish.
DC regulated power supply can be divided into chemical power supply, linear stabilized power supply and switching type stabilized power supply according to the habit, and they have various different types:
Chemical power supply
We usually use dry batteries, lead-acid batteries, nickel-cadmium, nickel-metal hydride, lithium-ion batteries belong to this category, each with its own advantages and disadvantages. With the development of science and technology, and produced intelligent batteries; in the rechargeable battery materials, the United States developers found that a manganese iodide, with which you can create a cheap, compact, discharge time, many times after charging still maintains the performance of a good environmentally friendly rechargeable batteries.
Linear regulated power supply
Linear regulated power supply has a common feature is that its power device regulator works in the linear region, relying on the voltage drop between the regulator to stabilize the output. Due to the large static loss of the adjustment tube, it is necessary to install a large heat sink to give it heat dissipation. And because the transformer works on the frequency (50Hz), so the weight is larger.
The advantages of this type of power supply is high stability, small ripple, high reliability, easy to make multiple, continuously adjustable output finished product. Disadvantages are large, bulky, relatively low efficiency. This type of stabilized power supply and there are many kinds of output properties can be divided into voltage stabilized power supply and current stabilized power supply and voltage stabilized and current stabilized in one of the stabilized voltage and current stabilized (double stabilized) power supply. From the output value can be divided into fixed-point output power supply, band switch adjustable and potentiometer continuously adjustable type. From the output indication can be divided into pointer indication type and digital display type and so on.
Switching DC regulated power supply
With the linear regulated power supply is a different class of regulated power is switching DC regulated power supply, its circuit type is mainly single-ended flyback, single-ended forward, half-bridge, push-pull and full-bridge. The fundamental difference between it and the linear power supply is that it transformer does not work at the frequency but works in tens of kilohertz to several megahertz. Function tube is not working in the saturation and cut-off region that is the switching state; switching power supply is therefore named.
