single transformer inverterchargerchang

An inverter circuit design may be quite incomplete if it`s without an appropriate integrated battery charger circuit. Though you may find many inverters having an integral battery charger, the section will mostly employ a separate transformer for implementing it. The following article describes a unique design which utilizes the inverter trans
single transformer inverterchargerchang - schematic

former for power inverting as well as for charging the battery. The circuit diagram below shows a design where a single power transformer is used for inverting purpose as well as for charging the battery when mains is present. The good thing about the circuit is that the transformer doesn`t employ separate winding for this, rather works with the same input winding and reverts DC to the battery with the help of a few DPDT relays. The inverter section can be easiy recognized in the diagram, R1 to R6, including the T1 and T2 forms a general astable multivibrator circuit for producing the required 50 or 60 Hz pulses. These pulses drive the mosfets alternately which in turn saturate the transformer by switching the battery voltage in it. Thesecondary ofthe transformer generates the corresponding magnitude of AC which is finally used for operating the connected appliances. In this position the mosfets get linked with the transformer input winding, and thea battery with the circuit so that the inverter starts oscillating and the output appliances gets the AC power from the battery. Also due to the action of RL2 the mosfets get disconnected from the transformer, while the the lower tap connects with D6. Since the center is already connected to battery positive, the inclusion of D6 provides a half wave rectified voltage to the battery, which is effectively filtered by C3 so that the battery is able to get the required sufficient...

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