I have a project where I am trying to find a means of powering a sensor with the following requirements: 24-30 V and a regulated constant current of 2 mA (about 60 mW). The latter requirement I will handle with a constant-current diode.
The source power will come from a USB port (5V up to 200 mA).
My problem is that I need a low-cost method of DC-DC up conversion with very low EMI characteristics and was looking for something more novel than a traditional switched-mode converter. Also, low heat generation and light weight would be desired.
I am not an electrical engineer and wondered what my options were.
I have some crazy ideas such as electric-light-electric conversion (such as LEDs wired in parallel sandwiched with photovoltaic cells in series), but was hoping there might be a conventional way of doing this.