First of all, according to the actual situation of products for Power factor correction capacitor diagnosis, analysis of the source of interference and mutual interference ways and means. According to analysis results, targeted for rectification.
     Generally the main methods are as follows several rectification.
In a weakened source of interference to find the source of interference on the basis of the source of interference to be permitted within the scope of the weakening of the general weakening source of the following methods:
IC's in a Vcc and GND between the decoupling capacitor, the capacitor in the capacity of 0.01 μ F jujube 0.1 μ F between capacitor installation attention to the lead, so the shorter the better.
B guarantee sensitivity and signal to noise ratio in the circumstances and attenuator. Such as VCD, DVD video disc machines in the crystal, which affected more in the electromagnetic compatibility, reducing its rate of one of the ways is feasible, but it is not the only solution.
C have an indirect method is to make the signal line to stay away from the interference source.
2 wire and cable classification in the electronic equipment, line coupling is an important way to cause interference is an important reason, because of the frequency of factors can be roughly divided into high and low frequency coupling coupling. By coupling different ways, the rectification methods are different, Power factor correction capacitor and discussed separately below:
(1) low frequency coupling low-frequency coupling is guiding line length is equal to or less than 1 / 16 of the wavelength, the coupling can be divided into low-frequency electric and magnetic fields coupling, the physical model of the electric field coupling is capacitive coupling, the main purpose of rectification is reduced Distribution coupling capacitor coupling, or reduced volume, use the following method:
A circuit increased spacing decreased distributed capacitance is the most effective method.
B high conductivity additional shielding enclosures, and single-point grounding shielding enclosures can be effectively inhibit low-frequency electric field interference.
C additional filter can reduce the coupling between the two circuits of.
D lower input impedance, such as CMOS high input impedance of the circuit, the electric field of an extremely sensitive interference, in the allowable range and internal input capacitance or resistance to a lower resistance. The magnetic field coupling is inductively coupled physical model, primarily through its coupling between the lines to the distribution of mutual inductance coupling, it is the primary means of rectification damage or Power factor correction capacitor reduce the volume of their coupling, generally use the following:
Supplementary a filter in the filter, additional attention should be paid to filter input and output impedance and frequency response.
B decreased sensitive loop circuit and the source of the loop, that is, as far as possible, the signal or carrier line with the loop around or twist in one.
C increase of two circuit spacing, in order to soften the line to reduce the mutual inductance coupling between volume.
D if possible, as far as possible, and the source of sensitive circuit loop orthogonal plane orthogonal to reduce or close to the coupling of the two circuits.
E materials with high permeability to wrap up sensitive lines, the magnetic field can be an effective solution interference problems, it is noteworthy that to a closed magnetic circuit and to reduce the reluctance of the magnetic circuit will be more effective.
(2) high-frequency coupling high frequency coupling is longer than 1 / 4 wavelength due to the alignment of a circuit voltage and current standing will enhance coupling of, the following methods may be addressed:
A grounding line as short as possible, using as far as possible with ground-shell contact.
B rearrange the input and output line filter to prevent the coupling between the input and output lines to ensure that the filtering effect of the same filter worse.
C shielded cable shielding layer using multi-point grounding.
D will be connected with the hanging pin and received potential and to prevent the antenna effect.

3 Improved ground system ideal is a zero-impedance ground zero potential physical entities, it is not only a signal point of reference, current flow and voltage drop will not become obsolete. In the specific electrical and electronic equipment, this ideal ground did not exist when the current flowing through earth would surely arise when voltage drop. Accordingly base line interference may be forming mechanism can be attributed to the following two points: First, reduce impedance and low impedance power feeder. Second, the correct choice of the barrier and grounding loop by grounding to a suspension points, a single point grounding, more grounded, mixed ground. If sensitive mainly from the interference of external space or system shell, the suspension could be at solving them, but suspended the equipment easily static accumulation, to the extent that when the charge will, static discharge, suspension and it is not appropriate for general electronic equipment. Apply to a single point grounding low-frequency circuit, in order to prevent the frequency currents and other spurious signals in the current online points to a potential difference between the signal ground and power isolation and safety ground in the power line is located to the single-point connection. Single point grounding apply mainly to the frequency of less than 3 MHz. Multi-point grounding high-frequency signal is the only practical grounding in the RF transmission line will show characteristics, in order for the effectiveness of multi-point grounding, when the grounding conductor length exceeding the maximum frequency of 1 / 8 wavelength, multi-point, such as the need for a grounding Potential ground plane. Grounding more applicable to more than 300 KHz. Mixed grounding in the application of high-frequency since there in the low-frequency electronic circuits.