| 摘要 |
A DC-DC power converter including a bridge converter, a switching controller, a current sensing device, a current amplifier, and a PWM generator. The switching controller controls switching of the bridge converter based on a PWM signal. The current sensing device provides an average current signal indicative of an average output current of the bridge converter. The current amplifier compares the average current signal with a current reference signal and outputs an overload signal indicative thereof. The PWM generator generates the PWM signal and modifies the duty cycle of the PWM signal when the overload signal indicates an overload condition. The bridge converter may be implemented as either a half-bridge or a full-bridge converter. The current is sensed at the output or at the transformer primary. The sensed current may be processed to provide a signal proportional to average output current.
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