Introduction to the composition of DC stabilized power supply
Introduction to DC Voltage Regulators
It is an electronic device that can provide stable DC power supply for the load. DC regulated power supply power supply is mostly AC power supply, when the AC power supply voltage or load resistance changes, the DC output voltage of the regulator will remain stable. DC regulated power supply with electronic equipment to high precision, high stability and high reliability of the direction of development, the power supply of electronic equipment put forward high requirements.
Due to the characteristics of electronic technology, electronic equipment on the power supply circuit is required to be able to provide continuous and stable, to meet the requirements of the load electrical energy, and usually require the provision of stable DC power. The power supply that provides this stable DC power is the DC regulated power supply. DC regulated power supply in the power supply technology occupies a very important position. In addition, many electronics enthusiasts at the beginning of the first encounter is to solve the problem of power supply, otherwise the circuit can not work, electronic production can not be carried out, learning can not begin.
DC regulated power supply classification
1. Linear
Linear stabilized power supply has a common feature is that its power device regulator tube work in the linear region, relying on the voltage drop between the regulator to stabilize the output. Because the adjustment tube static loss is large, need 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.
2. Switching type
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 switching state; switching power supply is therefore named.
The advantages of switching power supply is small size, light weight, stable and reliable; disadvantages relative to linear power supply ripple is large (generally ≤ 1% VO (P-P), good can be done more than ten mV (P-P) or less). Its power can be from a few watts - a few kilowatts have products.
