Switch power supply design components function complete!

Nowadays, every aspect of life and all walks of life can not be separated from the use of switching Power Adapter. With the rapid development of switching power supply, switching power supply has been widely used in human applications with the characteristics of high efficiency, small size and convenience. However, the structure of switching power supply is not so simple. It is still difficult for beginners to develop switching power supply. There are many types of components used in switching power supply. The following is an introduction to the functions of components designed for switching power supply.

Switching power components are divided into you two classes, one is a general component, one is a special component!

One. Resistor:

1. Sampling resistance - constitutes the output voltage of the sampling circuit, the sampling voltage to the feedback circuit.

2. Voltage balancing resistance - plays a voltage balancing role in the symmetrical DC input circuit of the switching power supply, also known as balance resistance.

3. Voltage divider - constitute resistance voltage divider.

4. Drain resistance - when the power can be electromagnetic interference (EMI) filter capacitor stored charge discharge.

5. Current limiting resistance - plays the role of current limiting protection, such as used as a voltage regulator, optical coupler and input filter capacitor current limiting resistance.

6. Current detection resistor - Used with overcurrent protection circuit to limit the output current limit of switching power supply.

7. Shunt resistor - provides a bypass for current.

8. Load resistance: Load resistance (including equivalent load resistance) of the switching power supply.

9. Minimum load resistance - Minimum load resistance required to maintain the normal operation of the switching power supply to prevent the output voltage from being too high due to the open load.

10. False load - temporary load (such as resistance wire, cement resistance) when testing the performance indicators of the switching power supply.

11. Filter resistance - Used as filter resistance in LC filter, RC filter, π filter.

12. Bias resistance - provides bias to the control end of the switching power supply, or used to stabilize the operating point of the transistor.

13. Protection resistance - often used in RC type absorption circuit or VD, R, C clamp protection circuit.

14. Frequency compensation resistors - such as RC-type frequency compensation networks that make up error amplifiers.

15. Damping resistance -- prevents resonance in the circuit.

Two, inductor:

1. Filter inductance - constitute LC filter.

2. Energy storage inductor - often used in step-down or boost DC/DC converter circuit.

3. Oscillation inductance - constitute LC type oscillator.

4. Common-mode inductance, also known as common-mode choke, is often used in EMI filters to inhibit common-mode interference.

5. Series mode inductor - also known as series mode choke, it adopts single winding structure, generally in series in the input circuit of the switching power supply.

6. Frequency compensation inductance - constitute LC type, LCR type frequency compensation network.