The new CRO-SM2 is an advanced, ultra compact digital induction heater circuit and ZVS transformer driver designed for embedded applications.
- Optional OLED display for showing frequency, power, and error codes. (Sold separately)
- Adjustable power levels
- Digital protection circuits
- Simple on/off push button operation
- Auto heat regulation or workpiece detection using external connections or sensors
- Ultra compact & efficient
New CRO-SM2: Digital control Induction Heater & Power Resonator
Our new CRO-SM2 induction heater circuit will automatically drive reactive circuits (coil and parallel capacitor) at their resonant frequency. This is ideal for making a DIY Induction Heater or Solid State Tesla Coil. The new digital control system allows for advanced protection and interfacing with displays.
The power stage of the CRO-SM2 will keep the system in resonance even when something changes like adding metal to an induction heater coil. The digital circuits monitor the frequency and power levels to make sure it will keep working smoothly, and also for sending information to a display such as the resonant frequency, current, error codes and more.
The optional display can be very useful for experimentation as it allows the operating parameters to be monitored during use. We also offer a customisation service where we can write custom firmware for alternate displays or for interfacing with other devices.
Available as circuit only, or fitted with either a 50x50x13 mm heatsink, or a 50x80x27 mm heatink for higher power use. If mounting on your own heatsink, you must use a thermal interface material to prevent short circuit.
To use this circuit for induction heating, you will also need a suitable choke, induction heater coil, and PSU.
The CRO-SM2 is a compact induction heater module designed to work with a wide range of coil sizes and operating frequencies to give maximum performance in a highly compact package.
When used with our Induction Coil Assembly, or Induction Coil KIT (for making your own custom coil) the circuit should draw around 3.5A from a 12V supply if there is no metal object within the coil. When adding something to be heated, the current will increase significantly and will vary with the size of the object and the material it is made from. If using the KIT version of the coil assembly, the amount of standby current will depend entirely on how you build it. We can also build custom induction heater coil configurations to suit your requirements.
Our transformer kit is a great partner for the CRO-SM2 as it allows for more flexibility on coil design.
The power output can be selected (for temperature control) at four levels 25%, 50%, 75%, and 100%. At powers below 100%, the output is modulated by turning off and on every second.
- Automatically resonates low impedance reactive circuits
- Wide supply voltage range (12V – 26V)
- Digital Control
- Self protection from under voltage, over voltage, over current, overheating, and resonance failure,
- ZVS (Zero Voltage Switching)
- Current up to 20A continuous*, 70A peak
- Optional OLED Display
- High quality double layer PTH, 2oz Copper PCB
- Dimensions: L50 x W50 x H8 mm (without heatsink)
- Induction Heating: Materials Research, Nanoparticles
- Flameless non-contact heating
- Ammo case annealing
- DRSSTC (Solid State Tesla Coils)
- DC-AC Power Inverters
- Resonant Energy Experiments
- Wireless Power Transmission
- And more…
How hot can I get my metal part with the CRO-SM2?
The temperature rise in the material depends on many factors such as what the material is, the size, shape, how quickly it looses heat to the surroundings, operating frequency, and the dimensions of the heating coil. We can not answer questions relating to specific heating projects as there are too many variables to consider. If you consider that using a 24V input and your system pulls 10A, Then there is potentially 240W of heating power in the system (ignoring losses). You can get a rough idea using our Heater Power Calculator. In one test for a customer, the circuit successfully heated a block of graphite to 850°C using only a 12V supply with less than 100W of power input.
Can you make me a more powerful version?
Please see our new CRO-2, high power induction heater circuit.
DIY Induction Heater