Operation manual
CPU panel circuit
CPU panel may work with main functions in two CPUs. U2, main control chip, may
function to receive the startup signal and plate mode signal, send the mode signal and PWM
signal for control power, control every light via operation of 7219 on the display panel, and
scan the keyboard. Main control CPU is also to receive the feedback signal on power, voltage
and current and control the output of final power. U10, feedback chip, may function to receive
the feedback signal from the relay and feedback signal on power, voltage and current and
activate the alarm in case of upset. Two CPU chips are linked in the way of bus.
Voltage and current feedback from the output panel on CPU panel are converted between
d.c. and a.c. via AD536 and combined to power value via AD633.
Plate detection circuits are also provided on CPU panel.
The signal routing from CPU panel to the power panel is isolated with optical
coupling 521.
Circuit of display panel
Display panel may function to receive the signal from main control chip on the control
panel, activate every lamp and button and control the indication of nixie tube via a MAX7219.
Circuit of switch power panel
Switch power panel may function to provide power supply to the power amplifier based
on the principle of switch power supply. The panel will receive a PWM signal from CPU
panel and convert it to d.c. signal to be transferred to U1001 (UC3825 high-speed PWM
controller), producing two alternating square waves being not overlapped. Driven by U1003
and U1004 (7667), it is sent to the coil T1001 and T1002, and then used to activate four
VMOS tubes (IRF840) via the coil. On the other hand, alternating current may obtain a direct
voltage through bridge rectification circuit (BR1001) and filter circuit, and then is conducted
over the bridge circuit in a rotation manner structured by four VMOS tubes (840). Later, it
will be output via transformer T1003 in a push-pull manner, bridge rectified by the diode
(U860) and finally provide the d.c. voltage via L, C filter as required for the power amplifier.
Circuit of power panel
Power panel may function to output the appropriate power tube driving signal according
to the mode as provided by CPU panel and output the power plus the power amplification
power supply from the power panel. Power driving signal comprises VMOS tube (IRF510)
and driving coil T2001 and T2002. Power output circuit may operate with full bridge power
amplification circuit structured of 4 VMOS tubes (PMN1160). On the power panel, there are
circuits used to restrict short-circuit current and high-frequency drain current. In case of pretty
Heal Force EB03
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