What is a capacitor
Capacitor, usually referred to as 'the ability of its hold charge for capacitance, represented by the letter' C '.
Definition 1: capacitor, just as its name implies, is & lsquo;
Containers of electric & rsquo;
, is a kind of hold charge device.
English name: capacitor.
Capacitor is one of the extensive use of electronic components in electronic equipment, widely used in the circuit in the isolation pass-through, coupling, bypass, filtering, tuning circuit, energy conversion, control, etc.
Definition 2: capacitor, any two insulation and interval of conductor (close to each other
Including the conductor)
Among all constitute a capacitor.
With the changing of electronic information technology, digital electronic products renewal speed is faster and faster, with flat screen TV,
LCD and PDP)
, notebook computers, digital cameras and other products of consumer electronics production volume continues to grow, to drive the capacitor industry growth.
This article covers the repair methods of the two capacitor common faults.
One, a capacitor failure phenomenon: capacitance open, breakdown, leakage, after electrify breakdown failure reason 1, components after open circuit, open circuit capacitor without the effect of capacitor.
Different capacitor in the circuit fault, open circuit circuit of different specific failure phenomenon.
Such filtering capacitor hum appears after the open circuit, coupling capacitance silent after open circuit, etc.
2, components breakdown capacitor after the breakdown, losing the role of the capacitor, the capacitor for pathways between two pins, blocking effect of capacitor disappear, circuit of the dc fault occurs, thus affect the communication work state.
3, components leakage capacitor leakage, led to the decrease of the capacitor insulation performance between the two plates, the plates, and leakage resistance between direct current flow through capacitor, straight insulation performance of capacitors, capacitor capacity declined.
When the coupling capacitor leakage, will lead to large noise.
This is a small capacitor failure high incidence of failure, but also difficult to fault detection.
4, after electrify breakdown capacitor plus working voltage, breakdown, it again when the power is characterized by no breakdown, multimeter testing as it does not breakdown characteristics, current situation measuring dc voltage at the ends of the capacitor is zero or low, capacitance performance deteriorate.
Repair method 1, capacitance internal open circuit, switch components;
Capacitance external connection open and good welding again.
2, breakdown, capacitor.
3, capacitor leakage, change new.
4, after electrify breakdown, change new.
Second, for the maintenance of electrolytic capacitor is one of the fixed capacitor, electrolytic capacitor its failure characteristics and failure characteristics of fixed capacitor have many similarities, due to the particularity of electrolytic capacitor, electrolytic capacitor fault characteristics and has many differences.
In the circuit, high failure rate of electrolytic capacitor.
Fault phenomenon: capacitor poles fault reason 1, not electricity, breakdown, internal short circuit capacitor.
2, an unpowered normal, after electrify breakdown, capacitor external wire short circuit.
Repair method 1, change the new components.
2, capacitor outer wiring short circuit, check short-circuit point, disconnect.
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