At present, USB chargers, PD chargers, PD power adapters are developing in the direction of miniaturization, high efficiency, energy saving and environmental protection, multi-purpose, the correct understanding and selection of a variety of components is the basis for the development, design, production and production of chargers and power adapters to ensure that. Charger circuit board assembly of dozens to hundreds of components, they play a role are different, basically divided into two categories of special components and general-purpose components. Charger circuit in the type of general-purpose components and their main purposes are as follows:
It is used to filter out noise interference in the circuit, mostly ceramic capacitors.
Such as power decoupling capacitors, can prevent the generation of self-excited oscillation, such capacitors are mostly ceramic capacitors.
It is used to increase the switching speed of the transistor.
Including X capacitor and Y capacitor. 5.
It can filter out the common mode interference generated by the primary winding, secondary winding coupling capacitor, can be coupled from the primary side to the secondary side of the interference current to provide a return path to prevent the current through the secondary side of the coupling to earth.
It constitutes a differential circuit to obtain a sharp pulse.
Such as a pump capacitor in a polarity reversing DC/DC converter.
It can form RC-type and LC-type oscillators. 9.
It constitutes a phase-shifting circuit.
It constitutes a soft-start circuit, in the soft-start process so that the output voltage and output current is slowly built up.
It constitutes an RC-type frequency compensation network.
It constitutes a voltage doubling rectifier circuit with a diode.
It can eliminate self-excited oscillation of amplifier.
It is used to enhance the input stage of the power supply voltage, can also constitute a voltage feed-forward circuit.
They and resistors constitute RC-type delay circuits.
Capacitors used to form input circuit filters, output circuit filters, or auxiliary circuit filters, most of which are electrolytic capacitors.
It is also known as isolation capacitor, its role is to isolate the DC signal, only let the AC signal through. 18. interference suppression capacitor - also known as interference suppression capacitor.
In the EMI filter, respectively, to filter out the series mode and common mode interference.
It can filter out the grid between the series mode interference, commonly used in EMI filters, most of the high-voltage ceramic materials capacitors
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