You've got microjoules divided by milliseconds, don't you mean millijoules by milliseconds? Ergo .12 mjoules/2msec = 0.06 mwatts

 

Not if their pulses are more frequent. What of they can run at 1kHz?

We are still just guessing at the overall application you are dealing with. Better questions get better answers.

One push then it's all over, to create 120 uJoules to send 1 packet of a digital code to a paired receiver. ISM Band of frequencies of transmission. 868 0r 915 MHz.

My device one push then it's all over, generates 23,4 volts peak at 46 Hertz for 200 msec to send 5 packets of digital information. More transmissions better chance of signals getting to the receiver in case of interference. The receiver functions to close a relay contact and power up a light or motor or any other electrical load. Battery-less and wireless remote control switching.

Would you trade me 5 packets for one packet?

 

Is that 200 msec with 23 volts......or 200 msec for 23 volts to fall? Why not clearly explain and show us what you're doing. You starting question was about efficiency.....but we don't know what to compare it to....except those figures.....without context.

You seem to know what you are comparing....but we don't. We need to know specs on other device too.....not just yours.

So our answers will be out of your context.....til you share your context with us.

 

Is that 200 msec with 23 volts......or 200 msec for 23 volts to fall? Why not clearly explain and show us what you're doing. You starting question was about efficiency.....but we don't know what to compare it to....except those figures.....without context.

You seem to know what you are comparing....but we don't. We need to know specs on other device too.....not just yours.

So our answers will be out of your context.....til you share your context with us.

Firstly, the energy harvesting generators (EHG) in question perform the task of replacing an electromechanical wired-in switch with a battery-less and wireless version. The transmitters are powered by these EHGs.
The German company has an EHG that produces upon a single push, a 2 msec pulse of 15 Vp. It supplies enough power to cause the 868 MHz transmitter to send one packet of digital info with RF transmit power of 0dBm.
On one push, our EHG generates 30 Vpp (a continuous sine wave) for 200 msec that powers our 868 MHz transmitter to send 5 packets of digital info with RF transmit power of +13 dBm.