Basic Components – Semiconducting Materials And P–N Junctions – The Transistor’s Principle – Some Types Of Transistors – Bipolar Transistor General Modes – Transistor Devices In Switching Mode – Thyristors – Optocouplers – Electromagnetic Relays – Reference – Secondary Power Supplies – Introduction – Comparative Characteristics Of Linear And Switchmode – Power Supplies – Problems With Electrolytic Capacitors – Introduction – Design Features Of Aluminum Electrolytic – Capacitors – Design Features Of Tantalum Electrolytic Capacitors – Conclusions And Recommendations – References – Battery Chargers – Purpose And Modes Of Operation Of Battery Chargers – Arrangement And Principle Of Operation Of A Classical Bc – On Thyristors – Bcs With A Function Of Discharging The Battery – Bcs With Two Rates Of Output Voltage – Principle Of Action Of Bc With A Highfrequency Link – Ferroresonanttype Bcs – Autoreclosing Of A Bc – A Problem Of High Capacitance On Bc Output Ports – Arrangement Of Alarm About Failure Of Transformers In – Control Unit Of Bc – Problems Of Electromagnetic Relays In Bcs A Device To Monitor Proper Ventilator Functionality In Sites – With Batteries – References – Uninterruptable Power Supply – Diversity Of Uninterruptable Power Supplies – Static Switch – Inverter .
