What are the common DC stabilized power supply capacitors? and its detailed introduction
The so-called capacitor is an electronic component that contains and releases charge. The basic functional principle of a capacitor is charging and discharging, and of course it also has functions such as rectification and oscillation. In addition, the structure of the capacitor is very simple, and it is mainly composed of two positive electrodes, a negative electrode and an insulating medium arranged between them, so the type of capacitor is mainly determined by the electrodes and the insulating medium, which are commonly used in DC stabilized power supply capacitors ? and its detailed introduction.
1. Filter capacitor: By using a filter to remove unnecessary AC components, the DC power supply connected between the positive and negative poles of the DC voltage can be smoothed. Large-capacity electrolytic capacitors are usually used, and are also used to stabilize DC power supplies, and other types of small capacitors are connected in parallel with the circuit to avoid high-frequency AC.
2. Decoupling capacitor: It is connected in parallel between the positive and negative poles of the power supply of the amplified DC power supply circuit to prevent the parasitic oscillation caused by the positive feedback caused by the internal resistance of the power supply.
3. Bypass capacitor: DC regulated power supply circuit for AC and DC signals. Either connect a capacitor in parallel across a resistor, or connect a specific point in the DC power supply circuit to a set AC signal with a common potential, or in the case of pulsed signals, attenuate the AC signal component by: Voltage drops to avoid resistance.
4. Coupling capacitor: In a DC regulated power supply circuit with AC signal processing, the DC power is separated to connect the signal source and the DC regulated power supply circuit after signal processing, or as a stage between two amplifiers and AC signals or pulses The inter-connection does not interfere with each other because it allows the signals to pass through the DC operating points of the preamplifier and postamplifier's DC regulated power supply circuits.
5. Tuning capacitor: Connect to both ends of the oscillation coil of the resonant DC stabilized power supply circuit, and select the oscillation frequency.
6. Pad capacitance: auxiliary capacitor, connected in series with the main capacitor of the resonant DC regulated power supply circuit. When set, the frequency range of the vibration signal is narrowed, and the vibration frequency at the low frequency end is significantly higher.
Crystal oscillator DC regulated power supply circuit and equivalent DC regulated power supply circuit
7. Compensation capacitor: auxiliary capacitor, connected in parallel with the main capacitor of the resonant DC regulated power supply circuit. By adjusting this capacitor, the frequency range of the vibration signal can be expanded.
8. Neutralization capacitor: neutralization capacitor: connected in parallel between the base and emitter of the transistor amplifier, it forms a negative feedback network and suppresses the self-excited oscillation caused by the capacitance between the transistors.
9. Frequency stabilizing capacitor: It plays a role in stabilizing the oscillation frequency in the DC regulated power supply circuit.
10. Time capacitance: a capacitor connected in series with the resistor R of the DC stabilized DC power supply circuit to determine the length of charging and discharging time.
11. Accelerating capacitor: connected to a DC regulated power supply circuit with oscillator feedback to speed up the positive feedback process and increase the amplitude of the oscillating signal.
12. Shorten the capacitor: In the DC stabilized UHF tuner power supply circuit, capacitors are connected in series to shorten the length of the oscillating inductor.
13. Rod capacitor: capacitor oscillates at 3 points In the DC stabilized power supply circuit, the capacitor connected in series with the inductance oscillation coil plays a role in eliminating the influence of transistor junction capacitance on frequency stability.
14. Silver capacitor: Capacitor 3-point oscillation In the regulated DC power supply circuit, the capacitor connected in parallel at both ends of the induction oscillating coil eliminates the influence of the junction capacitance of the transistor and makes the oscillator easier to vibrate.
15. Amplitude stabilizing capacitor: used in the frequency discriminator to stabilize the amplitude of the output signal.
16. Pre-emphasis capacitor: RC high-frequency component is very small. It is recommended to add network capacitors during processing of audio modulation signals to avoid attenuation and crossover losses.
17. De-emphasis capacitor: In order to restore the original audio signal, an RC capacitor must be set in the network to jointly attenuate the high-frequency components and noise generated by the pre-emphasis of the audio signal.
18. Phase shift capacitor: a capacitor used to change the phase of an AC signal.
19. Feedback Capacitor: A capacitor connected between the input and output terminals of the amplifier to return the output signal to the input terminal.
20. Downstream current limiting capacitor: connected in series with the AC circuit, using the capacitive reactance characteristics of the capacitor to limit the AC current relative to the AC current, thus forming a DC stable power supply circuit with voltage splitting.
21. Flyback capacitor: It is used in a DC stabilized power supply circuit with line scanning output. The line is connected between the collector and emitter of the line output tube to generate high-voltage, sawtooth-like reverse motion pulses. Its Dielectric strength typically exceeds 1500 volts.
22. S Correction Capacitor: Connected in series with the deflection yoke loop to correct extended linear distortion at the end of the receiver tube.
23. Bootstrap boost capacitor: Use the charging and discharging energy storage characteristics of the capacitor to increase the potential of a certain point in the regulated power supply circuit, so that the potential of this point is twice the value of the power supply voltage.
24. Bright spot elimination capacitor: installed in the DC stable power supply circuit of the video amplifier, used to eliminate the bright spots remaining when the picture tube is turned off.
25. Soft start capacitor: Usually connected to the switch base of the switching power supply to prevent excessive surge current or high peak voltage from being added to the switch base when the switch is turned on and damaged.
26. Starting capacitor: It is connected in series with the secondary winding of the single-phase motor to provide a phase-shifted starting AC voltage for the motor. After the motor works normally, the voltage is cut off by the secondary winding.
27. Running capacitor: It is connected in series with the secondary winding of the single-phase motor to provide phase-shifted alternating current for the secondary winding of the motor. When the motor is working normally, it is connected in series with the secondary winding.
