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The signal from the current controlled monostable multivibrator switches transistorsQI1,Q12,andQ13onandoffthroughdrivingtransistorQ10. When thetransistorsareswitched on, thecurrentsteadilyincreasesthroughcoilL andtheload. Whenthetransistorsareswitchedoff,thecurrentflowsthrough diode D5 and steadily decreases. Thus, the switching duty cycle controls the average current. A summary of the circuit operation is as follows: The cell current is sensed by the current sensing resistor and compared withthecurrentcontrolcircuitsignal. Thedifference(error)changesthe monostable multivibrator, thus changing the duty cycle of the power switching circuitryandcorrectingtheloadcurrenttoreducetheerror. Figure4isa schematicdiagramofthecontrolcircuit. GatesG1andG2formtheastable multivibrator. Q1 buffers the output to the power circuitry. Amplifier Al formsthevoltagecontrolledcurrentsource. Q5isthecurrentsourcefor the current control circuit and Q2, Q3, and Q4 provide current control by switchingindifferentemitterresistanceforQ5. Q9actsasalowvalue currentsourceforzenerdiodeD5. Thezenervoltageisusedasthebase reference for Q5 and also for Q6, which provides power to the digital cir- cuits. Q7,Q8,andD4areusedtodisablethepowersupplywhentheon-off control signal is off or low. 2.4 SAFETY CIRCUITS Safety circuits, as shown in Figure 5, are provided to automatically shutdownthesystemunderabnormaloperatingconditions. Inanautomatic safety shutdown, electrolysis module power is turned off, the electrolyte pump, water feed system and system reset are turned off, nitrogen purge to the module comeson,andthecauseofshutdownisindicatedonthefrontpanel. The"on" command signal for those components controlled by the automatic shutdown logic isgatedwithan"operate"signal. Whenthe"operate"signalisinalogical "false" state, these inhibit gates command the system to the "off" condition. Thus,normalsystemoperationdependsonalogic"true""Operate"signal. The "operate" signal is derived from the F output of a nor-gate memory latch. ThislatchisidentifiedasZ1oncardW2. Thecircuitisnormallyina 11PDF Image | WATER ELECTROLYSIS SYSTEM REFURBISHMENT
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