27
1100.. CCIIRRCCUUIITT DDEESSCCRRIIPPTTIIOONN
10-1. Power source part
10-2. Oscillation circuit part
10-3. Reset circuit part
AC 220V input power is reduced by passing through LVT(DC-TRANS), this power is changed to DC voltage through
rectification diode. After this, DC 12V leveled by 1000uF/35V capacitor and settled by regulator 7812 is output and in use
for relay and panel PCB driving power, input power and refrigerator control.
Another the second of LVT(DC-trans) is leveled by rectification diode and 1000uF/35V capacitor, and controlled to set
voltage by OP amp, constant voltage TR circuit, and then supplies a settled voltage to BLDC motor.
Oscillation circuit is for clock occurrence for synchronism to the information transmission/reception of MICOM
internal elements and for time calculation. If the resonator spec is changed, normal function is not performed
because of the changing of MICOM timing system.
Terminal Oscillation frequency
Xin(#30)
Xout(#31)
4MHz
4MHz
Terminal Voltage
Vcc
RESET
DC 5V
DC 5V
Power source Used circuit
Vcc(DC 5V)
+2V(DC 12V)
BLDC(DC 12V)
Surrounding power of MICOM and sensor detection part
Relay driving part, panel display part
OP AMP, TR constant voltage circuit use(BLDC fan motor drive)
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