型号不同的电容在电路中有多种不同的应用，需要我们根据电容器所使用的环境选择适合的电容元器件。那么电容在电路中究竟有多少种应用呢？

　　Different types of capacitors have different applications in the circuit, so we need to choose the appropriate capacitor components according to the environment used by the capacitor. So how many kinds of applications do capacitors have in circuits?

　　1.滤波电容：它接在直流电压的正负极之间,以滤除直流电源中不需要的交流成分,使直流电平滑,通常采用大容量的电解电容,也可以在电路中同时并接其它类型的小容量电容以滤除高频交流电。

　　Filter capacitor: it is connected between the positive and negative poles of the DC voltage to filter out the unnecessary AC components in the DC power supply and make the DC level smooth. Generally, large capacity electrolytic capacitors can be used, and other types of small capacity capacitors can be connected in the circuit at the same time to filter out high-frequency AC power.

　　2.退耦电容：并接于放大电路的电源正负极之间,防止由电源内阻形成的正反馈而引起的寄生振荡。

　　Decoupling capacitor: it is connected between the positive and negative poles of the power supply of the amplifier circuit to prevent the parasitic oscillation caused by the positive feedback formed by the internal resistance of the power supply.

　　3.旁路电容：在交直流信号的电路中,将电容并接在电阻两端或由电路的某点跨接到公共电位上,为交流信号或脉冲信号设置一条通路,避免交流信号成分因通过电阻产生压降衰减。

　　Bypass capacitance: in the circuit of AC and DC signals, the capacitors are connected to both ends of the resistance in parallel or connected to the common potential from a certain point of the circuit, so as to set a path for AC signal or pulse signal, so as to avoid voltage drop attenuation of AC signal components due to resistance.

　　4.耦合电容：在交流信号处理电路中,用于连接信号源和信号处理电路或者作为两放大器的级间连接,用于隔断直流,让交流信号或脉冲信号通过,使前后级放大电路的直流工作点互不影响。

　　Coupling capacitance: in the AC signal processing circuit, it is used to connect the signal source and the signal processing circuit, or as the stage connection between two amplifiers. It is used to cut off the DC signal and let the AC signal or pulse signal pass through, so that the DC working points of the front and rear stage amplifier circuits do not affect each other.

　　5.调谐电容：连接在谐振电路的振荡线圈两端,起到选择振荡频率的作用。

　　Tuning capacitor: it is connected at both ends of the oscillation coil of the resonant circuit to select the oscillation frequency.

　　6.衬垫电容：与谐振电路主电容串联的辅助性电容,调整它可使振荡信号频率范围变小,并能显著地提高低频端的振荡频率。

　　Pad capacitor: an auxiliary capacitor in series with the main capacitor of the resonant circuit. Adjusting it can reduce the frequency range of the oscillation signal and significantly increase the oscillation frequency at the low frequency end.

　　7.补偿电容：与谐振电路主电容并联的辅助性电容,调整该电容能使振荡信号频率范围扩大。

　　Compensation capacitor: the auxiliary capacitor in parallel with the main capacitor of the resonant circuit. Adjusting the capacitor can expand the frequency range of the oscillation signal.

　　8.中和电容：并接在三极管放大器的基极与发射极之间,构成负反馈网络,以抑制三极管极间电容造成的自激振荡。

　　Neutralizing capacitance: it is connected in parallel between the base and emitter of the triode amplifier to form a negative feedback network to suppress the self-excited oscillation caused by the capacitance between the triode electrodes.

　　9.稳频电容：在振荡电路中,起稳定振荡频率的作用。

　　Frequency stabilizing capacitor: in the oscillation circuit, it can stabilize the oscillation frequency.

　　10.定时电容：在RC时间常数电路中与电阻R串联,共同决定充放电时间长短的电容。

　　Timing capacitor: it is connected with resistance R in series in RC time constant circuit to jointly determine the charging and discharging time.

　　11.加速电容：接在振荡器反馈电路中,使正反馈过程加速,提高振荡信号的幅度。

　　Accelerating capacitor: connected in the oscillator feedback circuit to accelerate the positive feedback process and increase the amplitude of the oscillation signal.

　　12.缩短电容：在UHF高频头电路中,为了缩短振荡电感器长度而串联的电容。

　　Shortening capacitance: in UHF high frequency head circuit, the capacitance in series to shorten the length of oscillation inductor.

　　13.克拉波电容：在电容三点式振荡电路中,与电感振荡线圈串联的电容,起到消除晶体管结电容对频率稳定性影响的作用。

　　Clapper capacitor: in a capacitor three-point oscillation circuit, a capacitor connected in series with an inductive oscillation coil to eliminate the effect of transistor junction capacitance on frequency stability.

　　14.锡拉电容：在电容三点式振荡电路中,与电感振荡线圈两端并联的电容,起到消除晶体管结电容的影响,使振荡器在高频端容易起振。

　　Scylla capacitor: in the capacitor three-point oscillation circuit, the capacitor connected in parallel with both ends of the inductance oscillation coil can eliminate the influence of transistor junction capacitance and make the oscillator easy to vibrate at the high frequency end.

　　15.稳幅电容：在鉴频器中,用于稳定输出信号的幅度。

　　Amplitude stabilizing capacitor: used to stabilize the amplitude of output signal in frequency discriminator.

　　16.预加重电容：为了避免音频调制信号在处理过程中造成对分频量衰减和丢失,而设置的RC高频分量提升网络电容。

　　Pre weighting capacitance: in order to avoid the attenuation and loss of frequency division caused by audio modulation signal in the process of processing, the RC high frequency component is set to enhance the network capacitance.

　　17.去加重电容：为了恢复原伴音信号,要求对音频信号中经预加重所提升的高频分量和噪声一起衰减掉,设置RC在网络中的电容。

　　De weighting capacitance: in order to recover the original accompanying sound signal, it is required to attenuate the high-frequency component and noise in the audio signal after pre emphasis, and set RC capacitance in the network.

　　18.移相电容：用于改变交流信号相位的电容。

　　Phase shifting capacitance: capacitance used to change the phase of AC signal.

　　19.反馈电容：跨接于放大器的输入与输出端之间,使输出信号回输到输入端的电容。

　　Feedback capacitance: the capacitance that is bridged between the input and output of the amplifier to make the output signal back to the input.

　　20.降压限流电容：串联在交流回路中,利用电容对交流电的容抗特性,对交流电进行限流,从而构成分压电路。

　　Step down current limiting capacitor: it is connected in series in the AC circuit to limit the AC current by using the capacitive reactance characteristics of the capacitor to AC, thus forming a voltage dividing circuit.

　　21.逆程电容：用于行扫描输出电路,并接在行输出管的集电极与发射极之间,以产生高压行扫描锯齿波逆程脉冲,其耐压一般在1500伏以上。

　　Reverse capacitance: it is used for line scan output circuit and connected between collector and emitter of row output tube to generate high voltage line scanning sawtooth wave reverse pulse. Its withstand voltage is generally above 1500 v.

　　22.S校正电容：串接在偏转线圈回路中,用于校正显象管边缘的延伸线性失真。

　　S correction capacitor: connected in series in the deflection coil loop to correct the extended linear distortion at the edge of the picture tube.

　　23.自举升压电容：利用电容器的充、放电储能特性提升电路某点的电位,使该点电位达到供电端电压值的2倍。

　　Bootstrap boost capacitor: the potential of a point in the circuit is raised by using the energy storage characteristics of the capacitor during charging and discharging, so that the potential at this point is twice the voltage value at the power supply terminal.

　　24.消亮点电容：设置在视放电路中,用于关机时消除显象管上残余亮点的电容。

　　Bright spot elimination capacitance: it is set in the video amplifier circuit and used to eliminate the residual bright spot on the display tube when shutting down.

　　25.软启动电容：一般接在开关电源的开关管基极上,防止在开启电源时,过大的浪涌电流或过高的峰值电压加到开关管基极上,导致开关管损坏。

　　Soft start capacitor: it is generally connected to the switch tube base of the switching power supply to prevent the switch tube from being damaged due to excessive surge current or high peak voltage added to the switch tube base when the power is turned on.

　　26.启动电容：串接在单相电动机的副绕组上,为电动机提供启动移相交流电压,在电动机正常运转后与副绕组断开。

　　Starting capacitor: it is connected in series on the secondary winding of single-phase motor to provide the motor with starting phase-shifting AC voltage, which is disconnected from the secondary winding after normal operation of the motor.

　　27.运转电容：与单相电动机的副绕组串联,为电动机副绕组提供移相交流电流。在电动机正常运行时,与副绕组保持串接。

　　Operating capacitance: it is connected in series with the secondary winding of a single-phase motor to provide phase-shifting AC current for the secondary winding of the motor. When the motor is in normal operation, it is connected with the secondary winding in series.

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