Capacitor is a kind of energy storage element, with the characteristics of "straight through AC, low frequency through high frequency", people in order to know and identify the capacitor in different circuits, according to its effect in the line and give it many titles, the following introduces the meaning of some commonly used titles.
1. Filter capacitor
It is connected between the positive and negative poles of the circuit to remove the useless communication current in the circuit, generally using large-capacity electrolytic capacitors, and also using other fixed capacitors.
2. Decoupling capacitor
It is connected between the positive and negative poles of the circuit to avoid the parasitic vibration caused by the positive reaction path formed by the internal resistance of the power supply.
3. Coupling capacitor
It is connected between the signal source and the signal processing circuit or two-stage amplifier to isolate the direct current, so that the communication current or pulsating signal passes through, so that the DC working point of the trusted amplifier does not affect each other.
4. Bypass capacitor
It is connected to both ends of the resistor or directly from a certain point to the common telecom, which sets up a path for the communication or pulsation signal in the AC and DC signals to avoid the voltage drop of the communication components when passing through the resistor.
5. Neutralize the capacitance
It is connected between the base and collector of the transistor and is used to overcome the self-excited vibration caused by the capacitance between the transistor poles.
6. Groove capacitor (tuned capacitor)
Capacitors connected to both ends of a resonant circuit or vibrating circuit.
7. Pad the capacitor
In the circuit, the frequency scale of the vibration signal can be reduced, and the capacitance of the vibration frequency at the low end can be significantly improved, which is connected in series with the main capacitor of the groove.
8. Compensate capacitance
In the vibration circuit, the capacitor that can increase the frequency scale of the vibration signal is connected in parallel with the main capacitor to play a supporting effect.
9. Reverse path capacitor
It is connected between the collector and the emitter of the inner output tube, and is used to generate the reverse path of the line scan sawtooth wave.
10. Self-bootstrap boost capacitor
Its energy storage is used to increase the potential of the circuit so that its potential value is higher than the power supply voltage that supplies power to that point.
11. "S" calibrate capacitor
It is connected in series in a deflection coil circuit and is used to correct the extension distortion on both sides.
12. Frequency stabilized capacitor
In a vibration circuit, a capacitor used to stabilize the vibration frequency.
13. Punctual capacitor
A capacitor that is connected in series with the resistor R in an RC punctual circuit for a short period of time.
14. Step-down current-limiting capacitor
It is connected in series in the communication circuit and is used to divide the voltage and limit the current of the capacitive reactance of the communication electric.
15. Shorten the capacitance
This capacitor is a capacitor that is connected in series in UHF high-frequency heads to shorten the length of the vibration inductance.
16. Clapped capacitors
In a capacitor three-point vibration circuit, the capacitor connected in series to the vibrating inductor coil improves frequency stability due to the influence of the capacitor of the transistor junction of the water transport.
17. Thira capacitors
In a capacitor three-point vibration circuit, the capacitor connected to both ends of the vibrating inductor coil is made easier to vibrate at the vibration frequency in order to eliminate the influence of the transistor junction capacitance.
18. Speed up the capacitance
It is connected to the vibration reaction circuit to speed up the positive reaction process and improve the vibration amplitude.
19. Pre-weighted capacitance
In order to avoid the attenuation or loss of the high-frequency weight during the modulation of the audio modulation signal, the capacitance in the RC network is appropriately increased by the high-frequency weight.
20. De-weighted capacitance
The capacitance in the RC network is attenuated along with the noise by attenuating the pre-raised portion of the audio signal and restoring the original appearance of the accompanying signal.
21. Amplitude stabilization capacitance
In the frequency discriminator, it is used to stabilize the output signal amplitude.
22. Spot reduction capacitance
In the picture tube accessory circuit, it is used to eliminate the capacitance of the shutdown bright spot.
23. Phase-shifting capacitance
A capacitor used to change the phase of a communication electrical signal.
24. Reaction capacitance
The capacitor 25, the soft-start capacitor that is used to react to the signal at the input and output terminals of the amplifier
Generally, it is connected to the base of the power switch to avoid the surge current or voltage added to the switch base when the machine is turned on and the switch is too large and damages the switch.
26. Starting capacitor
It is connected in series to the secondary winding of the single-phase motor, and the phase-shifting communication current for starting the secondary winding of the motor is supplied, and the motor is disconnected from the secondary winding when it is running normally.
27. Running capacitor
It is connected in series to the secondary winding of the single-phase motor, and the phase-shifting communication current is supplied to the secondary winding of the motor, and the secondary winding is still in the circuit when the motor is running normally.
Communicate safety porcelain dielectric capacitors
It is used to avoid antenna radio wave disturbance in the communication loop of electronic equipment, to avoid power supply noise of household appliances and other equipment, and to avoid electric shock when the equipment is faulty.
28. High-frequency and low-voltage porcelain dielectric capacitors
The CC1 series is a class of high-frequency and low-voltage porcelain dielectric capacitors, which are used in places with low loss and high capacitance stability or where the temperature coefficient is required to be clearly defined.
Such as: resonant circuit, high-frequency bypass, temperature compensation, control circuit time constant components, coupling elements with high stability requirements.
The CC81 series is a class of high-frequency and high-voltage porcelain dielectric capacitors, which are used in high-voltage resonant circuits above UR≥0.63KV, or in places where low loss and capacitance stability are required, or where the temperature coefficient is required to be clearly defined.
CT1 series is a class II low-frequency low-voltage porcelain dielectric capacitor, which is used in electrical appliances with low requirements for tgs value and capacity stability, such as low frequency, coupling, filtering, decoupling, etc., and can also be used as a time constant element in the control circuit.
The CT81 series is a Class II low-frequency and high-voltage porcelain dielectric capacitor. It is used in high-voltage bypass and coupling circuits, with large dielectric constant, large capacity and low loss.
CS1 series - three types of low-frequency low-voltage porcelain dielectric capacitors
It is used for broadband bypass coupling in ultra-high frequency and VHF circuits, and has the characteristics of high dielectric constant, small size and large capacity.
CT82 series - ultra-high voltage porcelain dielectric capacitors
It is mostly used in high-voltage bypasses that require ultra-high withstand voltage. It has small size, temperature resistance, and resistance
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