power adapters can be divided into these two categories

Power adapter manufacturer: power adapters can be divided into these two categories

Eahunt is a professional power adapter R & D manufacturer, national high-tech enterprises, with 20 + years of power supply production experience, the production of various types of small household appliances chargers, balance car chargers, USB chargers, etc., with a variety of specifications, certified power supply, welcome to come to consult. The next step is to introduce the classification of power adapters.

Power adapter can be divided into AC/DC and DC/DC two categories. as a secondary power supply DC/DC converter has been modularized, and the design technology and production process at home and abroad have been mature and standardized, and has been recognized by the user. but the primary power supply AC/DC, because of its own characteristics make the process of modularization, encountered a more complex technical problems and manufacturing process problems. the following Separately on the structure and characteristics of the two types of power adapters to be elaborated.

1. DC / DC class power adapter

DC / DC class power adapter is a fixed DC voltage into a variable DC voltage, also known as DC chopper. DC / DC class power adapter waveforms work in two ways: First, the pulse width modulation mode T is unchanged, change the frequency modulation mode t (general); Second, the frequency modulation mode t is unchanged and change the T (easy to produce interference). its specific circuits have the following categories

Buck circuit - buck chopper, the average output voltage Uo is less than the input voltage UD, the same polarity in and out; ② Boost circuit - boost chopper, the average output voltage Uo is less than the input voltage UD, the same polarity in and out.

③Buck-Boost circuits are buck or boost choppers whose average output voltage Uo is greater or less than the input voltage.

Cuk circuit - buck or boost chopper, the average output voltage Uo is greater or less than the input voltage UD, polarity polarity in and out of the opposite, inductive transmission.

2. Power adapter AC / DC converter

AC/DC converter is to convert AC to DC, the power current flow can be bi-directional. power current flow to the load of the transformation is called "rectification", the power current from the load back to the power supply is called "active inverter. AC/DC converter input for 50/60Hz alternating current, must be rectified, filtered, relatively large filtering electrolytic capacitors is essential. at the same time, due to safety issues, such as UL, CCEE and other standards and EMC directive restrictions (eg, IEC, FCC, CSA), AC input must be added to EMC filtering and the use of components in line with the safety standards, which restricts the AC/DC power supply This limits the AC/DC power supply further miniaturization of the volume.

In addition, due to the internal high-frequency, high-voltage, high-current switching action, making it more difficult to solve the EMC electromagnetic compatibility problems, but also on the internal high-density installation circuit design puts forward high requirements. due to the same reason, high-voltage, high-current switching makes the power supply operating loss increases, limiting the modularization of the process of the AC / DC converter. Make its efficiency to reach a certain degree of satisfaction

AC/DC converter can be divided into half-wave and full-wave circuits according to the circuit junction; according to the control characteristics of the circuit can be divided into uncontrollable, half-control and full-control of the three categories; according to the number of power supply phases can be divided into single-phase, three-phase and multi-phase; according to the circuit can be divided into one quadrant of the quadrant, two-quadrant, three-quadrant and four-quadrant operation.

Eahunt has the leading power supply production technology in China, the products have UL, CE, CB, FCC, GS, CCC, PSE, SAA, KC, BSMI and other international certifications, six energy-efficient power supply, quality is trustworthy.

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