Inverter/Yoonseo Design/H Bridge

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What is an H Bridge

"An H bridge is an electronic circuit that enables a voltage to be applied across a load in either direction." See the H Bridge wikipedia page.

Important Design Considerations

General Concerns

Avoid ground loop by having floating grounds (only on certain grounds -- need to clarify).

What Switches to Use

Likely use MOSFET, NPN (off until switched). See MOSFET.


Operating Rds = Resistance from Drain to Source while Gate activated. Needs to be low for efficiency.

Switching Rds = Resistance from Drain to Source needs to be low during the switch (to avoid excessive thermal build up during the switch-on).

See: MOSFETs and MOSFET drivers

What Length of Wire

Important because high frequency of signal creates inductance via EMF. Make sure all wires leading to gates are the same length, and make the wires as short as possible to minimize the inductance.

What Resistors

Resistance gauged for maximum voltage and current that is acceptable by the MOSFET. Greater the power, the faster the switching speed, because the mosfet gate to source acts like a capacitor. Keep gate resistors close as possible to MOSFET gate.

Position of Wires

Keep signal wires from power wires.