88 PCR-M
Appendix
Active filter
A circuit used to reduce the input current distortion factor (harmonic current). This
filter is used in the input power-supply block of the PCR-M. It is a switching-
controlled active filter. The use of the filter improves the power factor (0.9 (typical
value)).
Capacitor input-type rectifying (circuit) load
A load that is equipped with a rectifying circuit shown in Fig. A-8 (b). This type of
load draws current as shown in Fig. A-8 (a).
The input current peak value is generally approximately two to three times the rms
value, and the flow angle (current flow period) is 20 deg. to 90 deg., centering on the
output voltage peak (phase angle: 90 deg. or 270 deg.).
Fig.A-8 Capacitor input-type rectifying (circuit) load
■ Examples of major capacitor input-type rectifying loads
Household electric appliances
TV sets, video equipment such as VCRs, audio equipment, microwave ovens,
inverter air conditioners, and inverter lighting equipment
Office automation equipment
PCs, facsimiles, CAD systems, etc.
Others
Mainframe computers, factory automation equipment, communication
equipment, and other devices and equipment equipped with a switching power
supply
Voltage
Input current
Voltage
Input current
(a)
(b)
Input current
Input current
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