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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN2383 датащи(PDF) 22 Page - STMicroelectronics |
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AN2383 датащи(HTML) 22 Page - STMicroelectronics |
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22 / 39 page  Measurements at PWM frequency AN2383 22/39 Doc ID 12433 Rev 3 6.2 Working level 1 Figure 13. System working at level 1 Level 1 is the first and the lowest power working level. The PWM signal frequency, previously set to 60 kHz, smoothly decreases until the working current for level 1 is reached. As seen before, the PWM frequency is not constant and is adjusted in real-time to keep the current level constant. Natural changes such as the iron dilatation or the water warming up, slightly modify the resonant frequency and therefore the current delivered. For the 22 cm-diameter iron pot used for the test, level 1 means a PWM frequency of around 48.5 kHz, but variations of several kilohertz are possible and necessary in order to keep the current level constant. In this test, level 1 features a 40 ampere peak-to-peak current (I-PLATE, 20 ampere per division). PVM UP-G LW-G I - PLATE |
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