| 摘要 |
A DC power circuit for converting an input DC voltage into a predetermined output DC voltage includes a first switching device for switching a DC input voltage, an inductance device connected to an output terminal of the first switching device, a second switching device connected to an output terminal of the inductance device for switching an output from the inductance device, a driver circuit for comparing the output DC voltage with a first reference voltage to drive the first and second switching devices in accordance with the comparison, and a control circuit for comparing the input DC voltage with a second reference voltage to enable the driver circuit to selectively drive either the first or second switching device in accordance with the comparison. The control circuit primes or enables the second switching device to thereby step up the input DC voltage to produce a resultant output voltage from the inductance device when the input DC voltage is lower than the second reference voltage, and primes or enables the first switching device to thereby step down the input DC voltage to produce the resultant output voltage from the inductance device when the input DC voltage is higher than the second reference voltage.
|
