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These currents are maintained over a module voltage range of 13.5 to 17.5 voltsandasupplyvoltagerangeof25-31voltswithanefficiencygreaterthan 75%- Module4istheonlymodulewhichcanbeoperatedintheStandbyMode. In thismode,itcanonlybeoperatedatthelowcurrentvalue. Intheon-mode,all modulescanbemanuallyoperatedateitherhighorlowcurrent. Inthenormal automatic mode of operation, an external signal determines the high or low current value. The current controlled switching regulation consists of a control circuit mounted on a plug-in circuit board and the external power circuitry. Each control circuit board contains two identical control circuits. Figure 2 is a control circuit block diagram. The power supply provides regulated power for all blocks except the voltage controlledcurrentsource. Aninputsignalfromtheon-offcontrollogicdisables the power supply which stops drive signals to the power circuitry. The astable multivibrationgenerates a positive square wave signal of about 13 KHz for about 10% duty cycle. Either this signal or a similar externally generated signal drives the current controlled monostable multivibrator. The monostable period of this multi- vibratoriscontrolledbythevoltagecontrolledcurrentsource. Theoutputis buffered and used to drive the power circuitry. The voltage controlled current source has two input signals, the voltage across the current sensing resistor and the current from the current control circuit. Theoutputisacurrentproportionaltothedifferencebetweenthese twosignals. Thisoutputcontrolsthepowercircuitdutycyclethroughthe current controlled monostable multivibrator. The current controlled circuit provides three levels of control current for the voltage controlled current source, a standby level and two higher current levelsascontrolledbycurrentcontrollogicdigitalsignals. Figure3isa schematic diagram of the power circuitry. 9PDF Image | WATER ELECTROLYSIS SYSTEM REFURBISHMENT
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