Battery Converter and Inverter Project

Innovatia Off-Grid Power System Architecture

3 by 4 Inch Micromodules interconnect through shared buses

Outputs to the 170 V DC HVBus - the power system backbone

Scalable in 1 kW increments with external heat sink and fan

Extensive protection: input under- and over-voltage, overcurrent (transient and steady-state), overtemperature; fan control and driver

24 V Battery Bank - can be used with other voltages by resizing MOSFETs, transformer, input inductor, sense resistance, and storage capacitors

No Microcomputer; no Custom Parts - all through-hole technology can be maintained on site in case of failure

BCV401 Battery Converter Control

performs PWM and protection functions, including fan (temperature) control. 

The BCV401 supplies low-voltage power and the fault bus to BCV402 and INV401.

BCV402 Battery Converter Power

performs power conversion to 170 V HVBus for input to inverter.

The BCV401 and BCV402 are based on a new and better converter power circuit, the Boost Push-Pull (BPP) circuit. With a series inductor from the battery, it is immune to battery cable transient effects. The BPP immediately boosts the voltage to higher than the low battery voltage. The current is reduced with it and high-current circuitry minimized. The input inductor also protects the power switches from high-current transients that could destroy them. It is also the most efficient converter circuit topology that has yet to be discovered. Innovatia leads off-grid power conversion  technology in its application of the BPP converter circuit to battery conversion.

BCV402 boards can be paralleled to scale up power output. Nominal design is for 500 W per board. An external heat sink and fan (shared with other modules) complete the subsystem.

INV401 Inverter

The INV401 works with the BCV401 to output 50 Hz/60 Hz 120V rms sinusoidal voltage. The sine-wave is generated by a digital-analog circuit in segments of 20 per cycle. INV401 boards synchronize to the power-line and can be paralleled for increased power capability. Each board is designed to input 1200 W of power and is rated at a nominal 1000 W..

Project Status

Circuit-board prototypes are built and being developed. All circuits of the INV401 are working but the module needs additional testing. The BCV402 transformer is being built.

It is too early in the project to distribute a complete manual, though preliminary additional information is available to Assistants. A series of articles is being featured at on this Volksinverter project. Check there for detailed information.

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