| 摘要 |
According to the present invention a bus voltage limiter (10) is connected between a photovoltaic solar panel array (14) and a load (18) to limit the output voltage to a fixed dc reference voltage (V ref). The limiter includes a pulse width modulator (20) which controls the duty cycle of a power switch (22) from 0% to 100% to maintain a substantially constant output voltage V ref. A coupled inductor type boost DC to DC converter (26) includes a pair of main winding (26A,26B) which cooperate with the duty cycle modulated power switch to provide the output voltage. An auxiliary winding (26C) provides input ripple current cancellation in conjunction with a second inductor (30) and a dc blocking capacitor (32).
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