A dimmable induction lamp driver IC was developed. It is a mixed signal design with a digital front-end driving an analog circuit that fires and controls the induction lamp plasma. Line-voltage drivers were combined with low-voltage digital logic on one die.
The drive circuitry monitors and changes the magnetic drive in real time based on the varying, negative impedance load.
Mixed Signal Breadboard Development
An FPGA development platform was used to create the digital waveforms and dim profile
The FPGA drove a high voltage analog card that fires the lamp
A custom analog board was made to provided flicker-free dimming function with the actual induction bulb prior to integration into an IC
A dimmable CFL ballast IC was developed. It is a mixed signal design with a digital front-end driving an analog circuit that fires a compact fluorescent lamp (CFL). Dimming levels down to 5% without reducing lamp lifetime was achieved.
Lambda CFL Driver - Mixed Signal ASIC (iSine product)
Prior to release to Silicon, a development platform consisting of an FPGA board driving an analog board ‘prototyped’ the lamp drive.
Using the prototype board, many revisions were made to adjust the circuit to work well with a variety of CFL bulbs.
A complex feedback and control function was completed using synthesized, phase aligned active current control, and pulse burst envelope shaping
The final design was implemented in a mixed-signal IC