Kenwood TS-590SG Manual

Also see for TS-590SG: Reference guide Setting manual Setting manual Instruction manual Instruction manual

Contents

OPTIONAL ACCESSORY 09719.2 Rectifier Circuit● Adopts a PFC Circuit that does not Produce Harmonics in an AC Rectifier CircuitA switching power supply typically produces large harmonics in the rectifier circuit by its switching operation whichcompromises the phase factor and may cause noise and other disturbances to external devices due to the harmonics thatare reflected back to the AC input side.PS-60 incorporates a PFC-rectifier circuit that produces a rectified waveform close to a sine wave and prevents acompromise of phase factor and disturbances caused by harmonics.● Miniaturized Size by Employing an Interleaved Switching SchemeBy turning On and Off the FET switches on the master and slave sides alternately, the burden on each element is lessenedand reliability is improved.9.3 Switching Circuit, Constant-voltage Circuit and Protection CircuitIn the switching circuit, a full-wave current resonance type PFM control circuit is adopted to alternately turn On and Off twoFETs in a 50 % duty cycle. By defining a certain period of time after both FETs are turned Off, a soft switching operation,in which no current is made to flow at the point of switchover, is made possible to reduce noise.Figure 9-2 Comparing Rectification WaveformsA high switching frequency (about 500 kHz) is chosen to enable miniaturization of the transformer for highly-efficient DCconversion.The DC output voltage after the conversion is monitored by the detection circuit to be compared with the reference voltagein the PFM control circuit in order to control the switching frequency for stabilizing the output voltage. If an overvoltage isdetected, the switching of power source stops so as to suspend the DC output.Also, output current is monitored by the detection circuit and if an overcurrent is detected, the switching frequency is shiftedto droop the output voltage and the operation is transited to produce intermittent output.Figure 9-3 Circuit Diagram

/ 76

Related manuals for Kenwood TS-590SG