Polyphase pulse rectifier. The method of polyphase rectification can be adopted when the condition allows or requires the harmonic to be limited in a relatively small way. The 12-phase pulse rectifier THDV is about 10 to 15 and 18 phase pulse rectified, the THDV of which is about 3 to 8, meeting the

Equipped with source power filter. In addition to the traditional LC filter is still in use, an important trend of harmonic suppression is the use of active power filter. In series or parallel to the main circuit, the harmonic current is detected from the compensation object in real time, and the co

Installation of appropriate reactor. The input power factor of the converter depends on the AC-DC conversion circuit system inside the device. The parallel power factor can be used to correct the DC reactor, and the power side of the AC reactor can be connected in series. The THDV of the incoming cu

The primary task of PCB design is to properly select the size of the circuit board. Because the connection between components is too long, the impedance of the line increases and the anti-interference ability decreases. Is not conducive to heat dissipation, and the line is too thin and dense, easy t

Wiring principle of Power supply and ground. Whether the power supply and ground wiring of PCB is reasonable is the key to reduce the electromagnetic interference of the whole circuit board. The design of power cord and ground wire is a problem that cannot be ignored in PCB, and it is often the most

According to the principle of circuit functional unit layout of the umbrella components of the circuit:(1) Each functional circuit should determine the corresponding position according to the flow direction of the signals between them, so as to make the wiring convenient;(2) Each functional circuit

Principles for determining the location of special components:.(1) The heating element should be placed in a position conducive to heat dissipation, such as the edge of the PCB, and away from the microprocessor chip;(2) Special high-frequency elements should be placed next to each other so as to sho

In the operation of capacitors, if there is an occasional "crackling" discharge sound inside the capacitor, this is due to the sound produced when the dielectric breaks down and self-heals after the capacitor is impacted by the power grid. This situation will not affect the normal use of the cap

Capacitor housing is sealed. Generally internal media is not leakage. However, it is sometimes found that after the capacitor has been running for a period of time, a small amount of oil stains appear around the outlet terminal on the cover of the capacitor, which is due to the fact that the rem

With the increase of operation time, the capacitance of low-voltage capacitor will decrease, and the average attenuation rate of capacitance in five years is less than 1 %/ year. Since the capacitance is directly proportional to the working current of the capacitor, during daily inspection, attentio