Power Factor Correction (Pfc) To Prevent Harmonics In The Rectifier Circuit; Continuous Variable Rotations And The Cooling Fan; Dc/Dc Converter - Kenwood TS-990S In-Depth Manual

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Power Factor Correction (PFC) to Prevent Harmonics in the Rectifier Circuit

A switching power supply typically produces large harmonics in a rectifier circuit by its switching operation, causing

reduction of the power factor, and harmonics reflected back to the AC input side may cause noise and other

disturbances to external devices.

The TS‑990S employs a rectifier circuit of the Power Factor Correction (PFC) method to make current waveforms close

to the sine wave in order to prevent reduction of the power factor and disturbances due to power supply harmonics and

conform to international power supply harmonics regulations.

Fig. 44 Difference in Rectified Waveforms with/without Application of Power Factor Correction (PFC)

The temperature of the switching power supply block is subject to regular monitoring, and the cooling fan rotations are

continuously changed for the best‑suited cooling, increasing the cooling efficiency and reducing the cooling fan noise.

For the power feed to the respective blocks, a DC/DC converter is employed. In comparison with a regulator for power

feed on conventional transceivers, it generates less heat and requires less power consumption.

TRANSMISSION 04

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