Replace The Capacitors Five Points For Attention

Mar 25, 2017

Capacitor is the failure phenomenon of easy leakage, short circuit, open circuit, capacitor internal lead poor contact (such as plate and wire connection).Especially the electrolytic capacitor, the failure rate much higher than other types of capacitor.The failure phenomenon of electrolytic capacitor often have leakage, capacity, reduce, breakdown, electrolyte leakage, etc.Damage should be with the original type of capacitor.But there are many types of capacitor, such as no same model should be substitute, substitute the matters needing attention are as follows:

1, substitute capacitor nominal value can be in the original on the basis of the nominal value of the capacitor is plus or minus 10% of the float, the power supply filter capacitance, bypass capacitors, etc., the floating range can also be bigger, but for some circuit capacitor must according to the original nominal value when substitution, otherwise will cause the circuit work properly.Such as resonant circuit, the time constant of the circuit capacitor must be according to the original nominal value substitution.Again like the TV tube cathode coupling capacitance, and release after the damage of capacitor is also must according to the original nominal value substitution, otherwise it will affect image quality.

2, the substitution of the rated voltage of capacitor must be greater than or equal to the rated voltage of capacitor to or greater than the actual circuit of the working voltage.

3, alternative frequency characteristic of the capacitor must meet the requirements of the actual circuit of the frequency, or use the high frequency characteristic of capacitor substitution low frequency characteristics of the capacitor.

Capacitor is the failure phenomenon of easy leakage, short circuit, open circuit, capacitor internal lead poor contact (such as plate and wire connection).Especially the electrolytic capacitor, the failure rate much higher than other types of capacitor.The failure phenomenon of electrolytic capacitor often have leakage, capacity, reduce, breakdown, electrolyte leakage, etc.Damage should be with the original type of capacitor.But there are many types of capacitor, such as no same model should be substitute, substitute the matters needing attention are as follows:

1, substitute capacitor nominal value can be in the original on the basis of the nominal value of the capacitor is plus or minus 10% of the float, the power supply filter capacitance, bypass capacitors, etc., the floating range can also be bigger, but for some circuit capacitor must according to the original nominal value when substitution, otherwise will cause the circuit work properly.Such as resonant circuit, the time constant of the circuit capacitor must be according to the original nominal value substitution.Again like the TV tube cathode coupling capacitance, and release after the damage of capacitor is also must according to the original nominal value substitution, otherwise it will affect image quality.

2, the substitution of the rated voltage of capacitor must be greater than or equal to the rated voltage of capacitor to or greater than the actual circuit of the working voltage.

3, alternative frequency characteristic of the capacitor must meet the requirements of the actual circuit of the frequency, or use the high frequency characteristic of capacitor substitution low frequency characteristics of the capacitor.

Capacitor is the failure phenomenon of easy leakage, short circuit, open circuit, capacitor internal lead poor contact (such as plate and wire connection).Especially the electrolytic capacitor, the failure rate much higher than other types of capacitor.The failure phenomenon of electrolytic capacitor often have leakage, capacity, reduce, breakdown, electrolyte leakage, etc.Damage should be with the original type of capacitor.But there are many types of capacitor, such as no same model should be substitute, substitute the matters needing attention are as follows:

1, substitute capacitor nominal value can be in the original on the basis of the nominal value of the capacitor is plus or minus 10% of the float, the power supply filter capacitance, bypass capacitors, etc., the floating range can also be bigger, but for some circuit capacitor must according to the original nominal value when substitution, otherwise will cause the circuit work properly.Such as resonant circuit, the time constant of the circuit capacitor must be according to the original nominal value substitution.Again like the TV tube cathode coupling capacitance, and release after the damage of capacitor is also must according to the original nominal value substitution, otherwise it will affect image quality.

2, the substitution of the rated voltage of capacitor must be greater than or equal to the rated voltage of capacitor to or greater than the actual circuit of the working voltage.

3, alternative frequency characteristic of the capacitor must meet the requirements of the actual circuit of the frequency, or use the high frequency characteristic of capacitor substitution low frequency characteristics of the capacitor.

4, mica capacitor, ceramic capacitor can be substitution paper condenser.Ceramic capacitor can be substitution mica capacitor and glass glaze capacitor.Tantalum electrolytic capacitor can be substitution of aluminium electrolytic capacitor.

5, there is no suitable capacitor substitution, can use a capacitor in series, in parallel to obtain suitable capacitance.If the pressure value of the capacitor is not enough, also can be used in a series of methods to improve the withstand voltage value.Such as circuit needs to be more than 25 v voltage, electric capacity of 500uF capacitor.only 1000uF / 16v capacitor, two to 1000 uF /16 v capacitor in series.Series pressure can be got after 32v, the electric capacity of 500 uf equivalent capacitor.

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