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We have been involved in inverter design for numerous applications and power ratings.  Our company, ML Electronics Ltd, is based in the UK and provides various power supply design services (mW to 100kW).

MLE has in-house capability to produce an extremely wide range of robust & reliable inverter products.  This includes both linear and digital topologies providing high efficiencies of up to 95% with low thermal and electrical stress factors.

We can produce stand alone, rack or rail mount inverters.

EMC is an important aspect in inverter design and we have considerable expertise in this area.  Our development philosophy fully incorporates EMC considerations from initial concept and we have in house pre-compliance test equipment to aid the development process.

Case study - 10VA Triple output 50Hz sinusoidal inverter

Here a PIC16C54 calculates in real time the 20KHz Pulse Width Modulated (PWM) drive waveform for a low cost inverter power supply design with a high quality sinusoidal output. By using the PIC and a MOSFET push-pull bridge an advantage is gained over traditional analogue control circuits both in cost and complexity. All control functions such as current limit (with well-defined characteristics) and under voltage lockout are provided by the PIC. There is no need to provide active dc flux balance as the drive waveforms are digitally exact, as is the frequency. As the PIC uses a single fetch per instruction it is not possible to get 'hung up' by executing data rather than instructions, and with a built in watchdog a very robust solution is possible. Although a pre-production unit (supplied to a UK client) is shown here, this inverter is now in manufacture.