SLVAFK1 January   2025 INA228 , INA232 , INA234 , INA236 , INA237 , INA238 , MSPM0C1103 , MSPM0C1103-Q1 , MSPM0C1104 , MSPM0C1104-Q1 , MSPM0C1105 , MSPM0C1106 , MSPM0G1105 , MSPM0G1106 , MSPM0G1107 , MSPM0G1505 , MSPM0G1506 , MSPM0G1507 , MSPM0G1518 , MSPM0G1519 , MSPM0G3105 , MSPM0G3105-Q1 , MSPM0G3106 , MSPM0G3106-Q1 , MSPM0G3107 , MSPM0G3107-Q1 , MSPM0G3505 , MSPM0G3505-Q1 , MSPM0G3506 , MSPM0G3506-Q1 , MSPM0G3507 , MSPM0G3507-Q1 , MSPM0G3518 , MSPM0G3518-Q1 , MSPM0G3519 , MSPM0G3519-Q1 , MSPM0H3216 , MSPM0L1105 , MSPM0L1106 , MSPM0L1117 , MSPM0L1227 , MSPM0L1228 , MSPM0L1228-Q1 , MSPM0L1303 , MSPM0L1304 , MSPM0L1304-Q1 , MSPM0L1305 , MSPM0L1305-Q1 , MSPM0L1306 , MSPM0L1306-Q1 , MSPM0L1343 , MSPM0L1344 , MSPM0L1345 , MSPM0L1346 , MSPM0L2227 , MSPM0L2228 , MSPM0L2228-Q1 , TPS62866 , TPS62868 , TPS62869 , TPS6286A06 , TPS6286A08 , TPS6286A10 , TPS6286B08 , TPS6286B10

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Traditional Heater Control
  5. 2Constant Power Heater Control
  6. 3Hardware Implementation
  7. 4Software Implementation
  8. 5Software Algorithm Flow Chart
  9. 6Results
  10. 7Summary and Adaptations
  11. 8References

2 Constant Power Heater Control

The temperature of a resistive heating element is directly proportional to the power applied. Measuring the electrical power can be mechanically much simpler than measuring the temperature. Driving the element with constant power delivers constant temperature and adjusting the power adjusts the temperature. Unfortunately, the resistance of the heating element can vary significantly between batches and also changes over temperature. This means that both voltage and current need to be measured and the voltage applied needs to be adjusted to maintain constant power as the heater element resistance changes as seen in Figure 2-1. The DC/DC converter controlling the applied voltage draws an average current from the supply which can extend the battery life.

Constant Power Heater Control Figure 2-1 Constant Power Heater Control