An optimal selection of induction heater capacitance by Lee J. PDF

By Lee J.

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A standing wave mode is clearly visible along the edge plot (Figure 32a),and the peak fields are much higher than the bottom plot (Figure 32b). A set of tests at a variety of frequencies (both resonant and non-resonant) confirmed this analysis. CONCLUSIONS AND RECOMMENDATIONS A number of conclusions can be drawn from these results. The main conclusion is that decoupling capacitors should be distributed across the entire board to help reduce the board resonances. These board resonances are the main decoupling problem at high frequencies (above about 20 MHz).

There was no clear improvement with this configuration, and in fact, the fully populated board results were better, especially at low frequencies (below 400 MHz). Resistive Decoupling Around Board Edge A set of experiments were conducted with a resistor-capacitor combination placed around the outer edge of the test board. 2 ohm resistor. 01uf capacitor case was also reploted on Figure 29 for reference. There was some improvement in the S21 at higher frequencies with the R-C decoupling combination.

Resistive Decoupling Around Board Edge A set of experiments were conducted with a resistor-capacitor combination placed around the outer edge of the test board. 2 ohm resistor. 01uf capacitor case was also reploted on Figure 29 for reference. There was some improvement in the S21 at higher frequencies with the R-C decoupling combination. However, lower frequencies were significantly better with the fully distributed capacitor configuration. EMISSIONS AROUND THE EDGE OF THE BOARD It was determined that the primary emissions from the test board was around the edge of the board, rather than off the top or bottom plane.

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An optimal selection of induction heater capacitance considering dissipation loss caused by ESR by Lee J.


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