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MICOM function and circuit description
5-2. Circuit description
5-2-1. Power circuit
The power circuit consists of the noise attenuation part and the SMPS (Switch Mode Power Supply) part. The SMPS
consists of the rectifier (BD1 & CE1) to convert AC voltage to DC voltage, switching part (IC3) to switch the converted DC
voltage, transformer to transmit energy of the first side of the switching end to the second side, the secondary power to
supply power to MICOM and IC, and the feedback part (IC4) to feedback the secondary voltage to the first side of the
transformer in order to maintain the secondary voltage constant.
Caution
: High voltage (DC 310V) is maintained in this circuit. Wait at least 3 minutes after unplugging to allow the
current to dissipate. There is a danger of electric shock.
5-2-2. Oscillation circuit
The oscillation circuit provides the clock signal for
synchronization and calculation of time in relation
to the logic elements of microprocessor IC1
(MICOM). OSC1 must always use the original
OSC1
CSTLS4M00G53
rated parts, because if the specification changes,
the timing generated will not be correct, causing
erratic functioning of the microprocessor.
5-2-3. Reset circuit
The reset circuit allows the entire process to be
started from the initial status by resetting the
various elements within the MICOM (IC1), such as
RAM, whenever power is applied to the unit. Low
voltage is applied to the reset terminal for 10ms at
the beginning of the power input. The reset
terminal has a voltage of 5 V during general
operation. (If the reset operation fails, the
microprocessor will not operate.)
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