The McEk LENR Controller (Gerard McEk)

The following article was submitted by Gerard McEk

Since Andrea Rossi presented his E-Cat in 2011, there were rumors of him using a kind of additional control other than just the triac-based heater coil controller. Many people saw the E-Cat nearby, but there has never been a serious indication that such an additional device was installed or needed, although Defkalion did add such an apparatus to their Hyperion, and Brillouin also use some kind of electromagnetic stimulation.

It is not unlikely that EM or just magnetic fields may play a role in LENR. About a year ago Rossi has mentioned that the E-Cat requires AC and not DC. This and the other issues like the recent LENR replication failures of MFMP and others, as well as discussions I had with various people on this and other sites have brought me to the thought that LENR may require some magnetic stimulation (high δI/δT) as well as some control to dampen LENR when it starts to run away. Recently these thoughts have cumulated to a novel  LENR controller design, which should have all the features in it to stimulate and damp the LENR process and that is what I like to present on this forum. I would welcome your opinions to help me come to a final design. I know this is not a cheap controller. It is meant for properly equipped labs to give them handles to change some (maybe) essential parameters ‘on the fly’. Please see the drawing below.

I can clearly not give any guarantee that this controller enhances the probability of a stable LENR reaction, but it has all the features to prove or disprove that LENR can be influenced by short current pulses and short circuiting the heating coil.

The controller has the following features:

  1. Frequency control from 50 to 1000 Hz (AC). ( I could have added DC also to it, but I do not want it to make more complicated than needed and Rossi said LENR only works on AC).
  2. Manual temperature setting. (I do not want to build-in complex temperature trace control yet).
  3. The output power to the heating coil is AC Pulse Width Modulated. Depending on the set temperature and the measured temperature a build-in PID loop controls the width of the opening. Too much power (5 or 3 kW) or current will shut-off the IGBT’s at all times.
  4. The PWM power pulses can be as short a 10 µsec and the current up to 300 amps. This type of control will generate a lot of harmonics and these are obviously linked to the chosen frequency.
  5. There is a manual control for the DC voltage. The thought behind this is that you adjust this voltage such that you never exceed the maximum current of 300 Amps. It also directly influences the proportional factor of the PID loop which is compensated for this to avoid an unstable control loop.
  6. Two types of Thermocouples can be connected: a T-type (till 1200 oC) and a S –type (till 1600 oC). It has further an analogue input, in case another type of temperature measurement is used (0-1500 oC = 1- 10 V). The controller includes a selection switch for this.
  7. The controller shall have a check on the proper working of the thermocouples. In case of failure the controller will switch off and signal this.
  8. The controller can be connected to standard mains (240 V AC 50 Hz Phase/Zero) or in another version to power mains (400 V AC 50 Hz 3Ph). Proper switches and fusing shall be supplied.
  9. As long as the temperature is less than 5 degrees over the set temperature normal PWM control is maintained. Above that the two top IGBT’s switch off and the two bottom IGBT’s start to PWM control a short circuit (SC) of the heater coil. The coil is fully and continuously short circuited if the temperature is more than 100 degrees in excess of the set temperature (Tset), in a simple linear control (Tset ->Tset+100 = 0% -> 100% SC).


In the past I have worked with companies able to make these type of converters quite reliably. I will try to involve them in this design.

  • Sean

    There is a lot more to the ECAT invention and a lot more EM frequency trial and error should be made up to the gigahertz range. Other quantum elements are at play including electromagnet stimulation. I have been reading about the EM Drive by British aerospace engineer Roger Shawyer. Nasa has now proved its existence and despite similar scepticism like Rossi had with his ECAT invention, Roger Shawyer
    has also been proved right. Studying the science behind the EM drive, there is mention of the effect being made in tune with the right frequency and resonance. This is what seems to be needed with the ECAT. So there is lots more room for all to experiment including your circuitry. As the EM drive has shown signs of a warp bubble inside the chamber, along with the fact that that if Roger Shawyer plans to develop a EM drive at a potential trust to a magnitude of 5, the ECAT will go hand in hand with the EM drive. Keep up the good work. The future is with us.

    • Facepalm

      “Roger Shawyer has also been proved right.”

    • artefact

      When I read on the spaceflight emdrive page that they want to use a magnetron next because it produces a bit dirtier spectrum (which seems to work better) than what they use now I had to think of the e-cat replications and the use of pid controlers now to get dirtier input.

    • Gerard McEk

      I agree that LENR may be more effectively triggered by other (higher) frequencies, however, Rossi seems to have succeeded without it, or by using low resistance coils in combination with triac based power controllers. My thought is that maybe high dI/dt (and controlled short circuiting of the coil) could be the key and that is what I like to pursue.

    • James Andrew Rovnak

      I think you are right on Sean! I know Godes & Rossi have used high frequency EM both mentioning it in the past! The Deep Breather paper at ICCF19 also goes there!

  • Ted-X

    What about connecting a variable capacitor to the ends of the coil? The resonance and the harmonics could be controlled by changing the capacitance.

    • sven

      I imagine that if the frequency matters in stimulating nanopowder, that frequency would need to be in the microwave spectrum. Maybe it is the “kick” that maters, so the closer to impulse shaped form we get the better, a little like laser that charges but doesn’t fire until the kick comes. As nobody knows what is going on, the best design would allow the most freedom of choice.

  • Gerard McEk

    yes, I am sure this can possibly be reprogrammed to fit some of our requirements and will be more affordable than the McEk controller, but especially the high currents I have in mind, cannot be achieved with this. For the McEk controler, powerful IGBT’s are required and you will not a commercial controller with the powerful IGBT’s and a small sized rectifier stage in it. But it was a good thought.

  • Gerard McEk

    You would not find mosfets capable to handle that kind of voltages and currents. I believe IGBT’s are the best choice, but I surely will discuss this with the supplier, thanks for your comment.

  • Gerard McEk

    I believe that a high dI/dt (dH/dt) could be the key. That is not reachable with multi winding coils, because of the inductivity of this coil, unless you use a much higher voltage.

  • Just a reminder:
    5 Feb 2013:
    Q: “I have a specific question that may have interesting implications: does the E-Cat and the HotCat need AC electric power to work, or also DC power can be used? You said that also the gas powered models need an electrical drive: is it also AC in this case?”
    A: “AC or DC are both usable, with specific adaptations.” (A.R.)

  • James Andrew Rovnak

    Yes! I think higher frequency content will stimulate DBs or SPPs to initiate & control the LENR process producing power. I think both Godes & Rossi use EM stimulation in their systems.

  • Gerard McEk

    I want to have something in excess of what Andrea uses. This is quite special and there are not many firms in the world who can make this for the specified voltages and currents. The company where I will go to has this expertise and I hope they will be co-operative in this challenge.

    • Robert Ellefson

      I think you are optimizing for the wrong parameter here. More current does not equal more goodness, if you are seeking magnetic stimulus. Half the current with twice the number of turns in your coil will produce the same field intensity, for example, and reducing your coil diameter will strengthen it even further without altering the current. You need to design and specify your coil before you can optimize the coil driver like this. I strongly suggest you consider optimizing dI/dt instead of maximizing I.