| 摘要 |
<p>A method for automatic calibration of the power of electromagnetic oven includes the following steps: 1) selecting two current test values within a range of working current of the electromagnetic oven, making it operate in the case of the current test values and zero, detecting voltage values of current signals under the three operation states; calculating, by a CPU, a coefficient k and an intercept b according to a formula y (i) =k×i+b using the three sets of data, and storing them; 2) during operation, calculating, by the CPU, a current current signal i using a voltage value y (i) of the current current signal detected by the current detection and collection circuit and the coefficient k and intercept b, according to a formula i = 1/k×y (i) -b/k, and in turn calculating a current power using the current current signal and a current voltage signal. A calibration program is built in the chip for setting a parameter and automatically colleting and calculating the calibration parameter; during operation, the current or power may be automatically calibrated, which provides an accurate basis for adjusting the power of electromagnetic oven. The mode in which a conventional potentiometer is adopted for calibration may be replaced by the present invention, which results in reduction of cost and improvement of the reliability.</p> |
