Switching power supply Debug record two

1. The safety voltage is 36V.

2. Mains 220v, refers to a valid value, the peak is 1.414*220 to 311v.

The average value is 0.9*220.

3. Any kind of power supply, if their discharge direction is consistent, then the voltage will be superimposed.

4. Electrolytic capacitance accuracy is relatively poor, such as -+30% error,100uf capacitance in the 70~130uf is normal.

5.RN resistor ;PW power supply;

6. Resistance encoding table or Code table common standards are E12,E24,E96.

7. The larger the capacitance, the higher the charging current can be accepted, and the charging time will increase.

8. DC Filter capacitors are usually used to charge the capacitance of the power supply quickly, while the capacitance of the load discharge is relatively slow to achieve the DC filter.

9. Hardware-induced watchdog reset is: Crystal instability, power supply instability, reset pin uncertainty. Software-induced watchdog reset is: Dead loop, waiting statement, data overflow, feeding dog time is not enough.

10. The voltage value of electrolytic capacitor refers to the positive pressure of the anode to the negative electrode, the anode to the cathode is not resistant to much pressure.

11. The charging voltage of the inductor is not higher than the charging voltage, but the discharge voltage of the inductor can be higher than the charging voltage, so there will be an arc, so the transformer can complete the boost. The charge and discharge voltage of the capacitor is not higher than the supply voltage.

12. Usually we call the inductor with full power as the filter inductor, the inductor that is not charged is the energy storage inductor, and the energy storage inductor is very dangerous if it is fully charged, which is equivalent to a wire. Inductance is usually passive charge and discharge, to receive some control of the switch tube, capacitance is active charge and discharge.

13. Capacitance parallel capacity increased, voltage constant, capacitance series, capacity reduction, pressure increase.

Switching power supply Debug record two