Abstract
In this paper, an isolated multi-input single-output (MISO) converter is developed and applied to a thermoelectric energy conversion system to harvest thermal energy. The thermoelectric generators have individual maximum power point tracking functions. Furthermore, such a converter has a high step-up voltage conversion ratio. In addition, the presented converter is imposed on the thermoelectric energy conversion system with the three-point weighting strategy adopted to realize the maximum power point tracking (MPPT). In this paper, the basic principles of this converter are first described and analyzed, and finally some simulated and experimental results are offered to verify the feasibility and effectiveness of such a thermal energy harvesting system.
Highlights
As generally recognized, from the point of view of industrial applications, 50% of generated electricity is used, while the remainder is wasted via heat
From (27), it can be seen that if KL ≥ Kcrit_L(Da) holds, L works in CCM; if not, L will work in the discontinuous current mode (DCM)
Lm will operate in CCM; if not, Lm will work in DCM
Summary
From the point of view of industrial applications, 50% of generated electricity is used, while the remainder is wasted via heat. To construct a single-stage thermoelectric energy conversion system with multiple TEG inputs, a high step-up converter is indispensable. The circuit concept displayed in [12] is derived from [14], and this converter adopts only a single inductor to obtain a result identical to that of [14], decreasing the size significantly; this converter employs an elementary circuit configuration, resulting in the voltage gain not being high; the control of such a converter is relatively complicated. In [20], a single coupled inductor was used to harvest energy from multiple heat sources; the duty cycle for each input has its own limitations, and the overall voltage gain is determined only by the turns ratio. An isolated MISOC circuit is proposed and imposed on a thermoelectric energy conversion system
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