What is the composition of switching power supply
What is the composition of switching power supply? It is composed of power frequency diode, high-frequency diode, triode, voltage stabilizing control, photoelectric control, resistance, various capacitors, vibration soup control integrated block, electromagnetic components, LGBT switching tube, etc.
What is the composition of switching power supply? The main component of switching power supply is electronic switch (FET or triode). First, the input terminal should have protection (fuse) filter (capacitor). After rectification (rectifier bridge), DC / AC conversion (transformer) rectifier output (rectifier diode) and then filtering (inductance and capacitance), there will be a stable output. What is the composition of the switching power supply? There is an auxiliary winding in the transformer part. The current and voltage sampling is carried out through the IC to control the duty cycle of the switch, so as to adjust the output current. This is only one of the schemes. The switching power supply as a whole is the filter rectification adjustment feedback control output rectification and filtering. The specific scheme is based on specific requirements. What is the composition of switching power supply? Do you know?
Functions of various components of switching power supply
Functions of various components of switching power supply, resistor:
1. Sampling resistance - the sampling circuit that forms the output voltage and sends the sampling voltage to the feedback circuit.
2. Voltage equalizing resistance - it plays the role of voltage equalizing in the symmetrical DC input circuit of switching power supply, also known as balance resistance.
3. Voltage divider resistance - constitutes a resistive voltage divider.
4. Discharge resistance - when power is off, the charge stored in the capacitor in the electromagnetic interference (EMI) filter can be discharged.
5. Current limiting resistor - plays the role of current limiting protection, such as the current limiting resistor used as voltage stabilizing tube, optical coupler and input filter capacitor.
6. Current detection resistance - used together with overcurrent protection circuit to limit the output current limit of switching power supply.
7. Shunt resistance - provide bypass for current.
8. Load resistance - load resistance of switching power supply (including equivalent load resistance).
9. Minimum load resistance - the minimum load resistance required to maintain the normal operation of switching power supply, which can avoid high output voltage due to open load.
10. False load - the load temporarily connected when testing the performance index of switching power supply (such as resistance wire and cement resistance).
11. Filter resistance - used as filter resistance in LC filter, RC filter and π filter.
12. Bias resistance - provides bias voltage to the control terminal of switching power supply, or is used to stabilize the operating point of transistor.
13. Protection resistance - commonly used in RC absorption circuit or VD, R and C clamp protection circuit.
14. Frequency compensation resistor - for example, RC type frequency compensation network constituting error amplifier.
15. Damping resistance - prevent resonance in the circuit.
