technologies

Battery management systems (BMS)

I specialise in the application of both lead-acid and lithium ion battery systems. BMS's carry out the following functions:

• preserve battery integrity
• protect users & systems from the consequences of abuse
• prevent operation outside of the battery's capabilities
• prioritise resources; consumers, power sources, energy storage
• provide status information to the user
• interchange data with other systems
• many microcontroller based

typical system parameters: 12V & 24V, 100Ahr to 600A-hr capacity, up to 300 amps.

DC-DC power conversion

I have conceived & designed a large range of specialised DC-DC converters:

• single & bi-directional
• up convert, down convert, line stabilisation
• battery equalisation
• battery charging; lead-acid, nickel metal-hydride, lithium ion
• regulated DC supplies
• many with microcontroller based housekeeping

typical system parameters: 12V, 24V, up to 60 amps, 1kW.

DC-AC power conversion

I have conceived & designed a large range of both standard & specialised DC-AC inverters:

• pure sine wave, switch mode
• quasi-sine wave, switch mode
• single phase, three phase
• including soft start for powering motors
• for use on vehicles, including electric vehicles, railways, military aircraft

typical system parameters: voltages from 12VDC to 96VDC, 110 & 230VAC output, 50, 60 & 400Hz, up to 6kW

AC-DC power conversion:

Design of AC switch-mode power converters for:

• multi-output supplies for host equipment
• battery charging; lead acid, nickel metal-hydride, lithium ion
• single phase, three phase

typical system parameters: 110, 230 & 400VAC, up to 400VDC, up to 1kW

Uninterruptible power supplies:

Design of UPS's:

• 230VAC to 230VAC pure sine on-line switch mode (with patent)
• 230VAC to 400VDC on-line switch mode
• 24VDC to 24VDC, 300 amps

Telecommunications equipment:

Design of:

• Telephones
• Facsimile machines
• Modems
• Printers
• Data terminal equipment

Radio communications equipment:

Design of radio frequency transmitters & receivers:

• voice
• voice & video
• FM & VSB
• HF, VHF, UHF & microwave