1. Linear
A common feature of linear stabilized power supply is that its power device regulator tube works in the linear region, and the output is stabilized by the voltage drop between the regulator tubes. Due to the large static loss of the adjustment tube, a large radiator needs to be installed to dissipate it. And because the transformer works on the power frequency (50Hz), the weight is large.
The advantages of this type of power supply are high stability, small ripple, high reliability, easy to make multiple channels, and output continuously adjustable finished products. The disadvantage is that it is bulky, bulky, and relatively inefficient. There are many kinds of this type of stable power supply, which can be divided into regulated power supply and regulated current power supply from the output nature, and regulated and stable current (bistable) power supply that integrates voltage regulation and current regulation. Judging from the output value, it can be divided into fixed-point output power supply, band switch adjustment type and potentiometer continuously adjustable type. From the output indication, it can be divided into pointer indication type and digital display type and so on.
2. Switch type
A type of stabilized power supply different from linear stabilized power supply is switching DC stabilized power supply. Its circuit types mainly include 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 the transformer does not work at the power frequency but works at tens of kilohertz to several megahertz. The function tube does not work in the saturation and cut-off region, that is, the switching state; the switching power supply is named after it.
The advantages of switching power supply are small size, light weight, stable and reliable; the disadvantage is that the ripple is larger than that of linear power supply (generally ≤1% VO (P-P), good can achieve more than ten mV (P-P) or less) . Its power can be from a few watts to several kilowatts.
