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8. Operation Principle of Circuit
8-1) Power Source Part
When power is supplied, electric wave is rectified through BD1 to generate voltage of
about DC 300V.Top S/W is automatically switched to the optimum condition according to
load condition of the second part.
When electricity flows between D and S of the top S/W, electricity is generated inside
the trans, and wnen the power between D and S is turned off, electricity which is
deserted at trans is transmitted to the second part.
This process is repeated to maintain the fixed voltage of 12V by C102 of the second
part. This power supplies electricity to power source of 5V, relay and display, and it
allows operation of main PCB possible.
8-2) Oscillation Circuit Part
Terminal
Oscillation Frequency
Xout(#31)
Itis oscillation circuit for synchronism clock generation and time calculation on
information sending/receiving of internal elements. It does not carry out its normal
function because timing system of MICOM alters in case the specification of resonator
changes.
8-3) Reset Circuit Part
)
M
;
|
|
Terminal |
Voltage
|
|
C
Vee
DC 5V
O
M
RESET
|
DC SV
Reset circuit is a circuit which allows the whole program operate on an initial
position by initializing several parts such as RAM inside of MICOM when power is
applied to MICOM. When
power is supplied, the reset terminal voltage becomes
several tens us
"LOW" state compared with Vcc voltage (DC 5V) of MICOM, and it
maintains
"HIGH" (Vcc voltage) state in normal operation condition.
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