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5.1 General and Circuit Description
Composition: EUB-5500 power is composed of the following units.
1.
Power unit circuit description:
1. LINE FILTER (Line filter block)
Removes noise on the AC line.
2. TRANS (Transformer block)
Switches over voltage so that each circuit can operate in optimum voltage as well as
isolates the primary and secondary circuits.
unit.(120℃)
3. PFC CIRCUIT (PFC circuit block)
Consists of PFC circuit and protection circuit. The PFC circuit suppresses harmonics
as well as improves distortion of voltage waveform and current wave height value to
realize power-factor improvement.
The protection circuit shuts off input by a signal from the overvoltage protection
circuit.
4. MAIN CONVERTER CIRCUIT (Main converter circuit block)
The switching conversion system converts power to voltage and supplies it to each DC
converter via transformer.
5. RECTIFICATION AND SMOOTHING CIRCUIT (Rectification and smoothing circuit
block)
After rectifying by the diode, the power is smoothed by the capacitor to get DC source.
6. REGULATOR CIRCUIT (Regulation circuit block)
The series type regulator system stabilizes DC output and reduces output ripples.
7. OVER CURRENT PROTECTION CIRCUIT (Overcurrent protection circuit block)
When the load is short-circuited or overcurrent occurs, this circuit protects the load or
power circuit.
8. OVER VOLTAGE PROTECTION CIRCUIT (Overvoltage protection circuit block)
Protects the load and power circuit when output voltage exceeds over the rating.
9． Filter Circuit
The noise from main converter is reduced by this circuit.
10 Chopper circuit
This circuit provide stable DC output for digital circuit.
Section 5 Power Unit
HM-071C
: Main power unit.
HM-071K
: DC-DC converter unit.
A temperature fuse is built in the
5 - 1
L1E-EA0229
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