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Circuit Descriptions
10-1) Source Power Circuit
10-2) Oscillator Circuit
10-3) Reset Circuit
Terminal Oscillation Frequency
Xin(#30)
Xout(#31)
4MHz
4MHz
This circuit shows SMPS(Switch Mode Power Supply) which converts AC input voltage (115V, 60Hz) to a high DC
voltage (170V). The input AC source power is converted to DC through a wave rectifier (BD1) and the converted DC
power will generate a constant waveform on the switching transformer using a high speed (100KHz) switching motion of
TOP223Y. The D104 will rectify the generated voltage and transform into a steady 12V DC source power used for the
digital display panel and relays. The regulator (KA7805) finally transforms into 5V DC source power for the control board
and sensor’s circuits.
Caution) Be careful to handle this circuit due to high voltages (AC115V, DC170V)
This is oscillator circuit to generate synchronous clocks used to calculate the time for the microprocessor operation.
Note) If the specification of a resonator changes, micro-processor can not work properly.
The reset circuit is to initialize the values RAM ＆ other sectors of micro-processor. When the power is engaged initially,
the reset voltage becomes “Low,” and it keeps “High” in the normal operation.
Terminal Voltage
Vcc
RESET
DC 5V
DC 5V