I am an electronics hobbyist and could use a recommendation for a simple, compact 12V oscillation circuit capable of triggering a 12V electro-mechanical relay on demand.
The DUT is a 12VDC, battery-powered ZVS induction heating device that I made. It's activated by closing a N.O. SPST tactile switch which operates a 12V relay. It's very straightforward: pressing the button turns on the ZVS heater circuit, releasing it turns it off. The relay has a minimum coil activation voltage of 7.5V, and the relay stays engaged until the tactile switch is released or power falls below ~7.5V. Typical usage duration is 6-8 seconds per heating event.
I would like to add an oscillation circuit to my device so that when the tactile switch is closed the relay oscillates the ZVS circuit instead of operating it continuously. The frequency of oscillation cannot exceed 40kHZ, and in fact a much slower oscillation of <1kHZ would be preferred. I would also prefer a 50/50 duty cycle as a starting point if possible, as I won't know the best frequency until I can get the device to operate in this manner.
Finally, I am very limited by space on my circuit board and will need to make this the smallest oscillating circuit I can manage. I am comfortable working with SMD components and was looking at using the LTC1799 oscillator for this project (LTC1799 datasheet), but I quickly realized I'm not entirely sure how to make it work for this application and figured this might be a good time to ask for some help.
Thanks for any info one can share on this!
The DUT is a 12VDC, battery-powered ZVS induction heating device that I made. It's activated by closing a N.O. SPST tactile switch which operates a 12V relay. It's very straightforward: pressing the button turns on the ZVS heater circuit, releasing it turns it off. The relay has a minimum coil activation voltage of 7.5V, and the relay stays engaged until the tactile switch is released or power falls below ~7.5V. Typical usage duration is 6-8 seconds per heating event.
I would like to add an oscillation circuit to my device so that when the tactile switch is closed the relay oscillates the ZVS circuit instead of operating it continuously. The frequency of oscillation cannot exceed 40kHZ, and in fact a much slower oscillation of <1kHZ would be preferred. I would also prefer a 50/50 duty cycle as a starting point if possible, as I won't know the best frequency until I can get the device to operate in this manner.
Finally, I am very limited by space on my circuit board and will need to make this the smallest oscillating circuit I can manage. I am comfortable working with SMD components and was looking at using the LTC1799 oscillator for this project (LTC1799 datasheet), but I quickly realized I'm not entirely sure how to make it work for this application and figured this might be a good time to ask for some help.
Thanks for any info one can share on this!