Q of LC circuit

Jessica Shaw · 2011-12-15T17:39:48+00:00

Hi,The load schematic is at the following linkI am driving it using the H brdige circuit . What is the best way tocalculate the Q of this Load. I read the following article aboutmeasuring Q of this circuitThe article says that inorder to measure the Q, I need a transformerand a function generator. I do not have a transformer but I am usinga function generator. Plus the article talks about LC circuit and myload is helmholtz coils.The link for helmholtz coils is as followsAnd I am driving it by using H dridge at 100KHz ( resonant frequency).The inductors are 50uH each.The problem is that H brdige MOSFETS get hot. And I am thinking thatmay be the circuit can not be tuned or is not tuned because of itsunusual load , helmholtz coils.My questions are1. Can I measure the Q of the circuit using this article?2. If not what is the best way to do it.3. How can I keep my MOSFETS cool ? any circuit change. I know I canput heat sinks and cooling fan .4. LC networks when resonating do not need much energy but thiscircuit probably demanding lots of energy. Is this because of theinductor L1 (AS SHOWN IN THE SCHEMATIC)?Any suggestions will be highly appreciated.jess