Fig. 1. Flowchart of temperature control

Fig. 2. Flowchart of self-tuning

Fig. 3. Results of voltage acquisition. (a) SDADC 1 voltage acquisition; (b) SDADC 2 voltage acquisition; (c) dual-channel voltage acquisition

Fig. 4. Measurement temperature based on dual-channel voltage acquisition

Fig. 5. Effect of single filter. (a) Median; (b) mean; (c) first-order Kalman

Fig. 6. Flowchart of improved comprehensive Kalman filter algorithm based on 3σ criterion

Fig. 7. Effect of improved comprehensive Kalman filter based on 3σ criterion. (a) Constant temperature filter; (b) filter response characteristics, illustration shows the enlarged image at the frame line

Fig. 8. Comparison between original sampling and improved comprehensive Kalman filter sampling. (a) Rapid change of temperature; (b) constant temperature

Fig. 9. Test platform

Fig. 10. Temperature control data curves

Fig. 11. Temperature control curves of constant temperature control system under different environmental temperatures. (a) 50 ℃; (b) 0 ℃