High Efficiency Inverter for portable fluorescent tube
Disclaimer
The output of the inverter is more than 120VAC. Do not attempt construction of a device such as this unless entirely familiar with high-power electronics as well as proper safety procedures. The author specifically disclaims any and all liabilities associated with the construction and use of such devices. The design is presented here in the interests of providing information on experiments only.
Royer inverter is a high efficiency inverter. It uses resonant push pull configuration with a supply inductor to stabilize its oscillation. The conversion efficiency can reach 80% with appropriate selection of the transistors. The circuit below was reverse-engineered from a commercial flatbed scanner. I used the inverter module and the lamp to build a light stick. The module is so small that it can be put into a electric tooth brush. I build another one with the parts I have and put it into a flash light. The schematic diagram is shown below.
Tooth Brush Mod - Construction steps
1. Cut the tooth brush top and remove the motor.
2. Solder hook-up wires to the switch.
3. secure the fluorescent tube to tooth brush and solder the wires to the inverter module.
4. put the module in place.
5. Completed.
Flash Light Mod - Construction steps
1. Remove the starter from the fluorescent tube and secure the tube onto a flash light with hot glue..
2. Wind the transformer. The AA battery here has nothing to do but shows the size of the toroidal core.
3. Assemble the circuit and install the transformer in place.
4. segregate the wires with paper. The transistors have heatsinks installed.
5. Wrap the assembly properly.
5. Completed.
6. Notes:
6.1 Caution: High voltage is present at the primary winding. It could be dangerous.
6.2 If the circuit doesn't work, swap the polarity of one of the low voltage windings.
6.3 The transistor needs to be installed on a heat sink.
6.4 The circuit draws more than 0.7A current.
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End of the project
