Abstract: A buck-boost power converter includes a power stage to convert an input voltage to an output voltage, an error amplifier to generate an error signal according to a reference voltage and a feedback signal proportional to the output voltage, a ramp generator to provide two ramp signals, and two comparators to generate two control signals according to the error signal and the two ramp signals to drive the power stage. By using feed-forward technique, one of the two ramp signals has a peak varying with the input voltage and the other ramp signal has a valley varying with the input voltage, so that the power converter has fast line response.

Abstract: A buck-boost power converter includes a power stage to convert an input voltage to an output voltage, an error amplifier to generate an error signal according to a reference voltage and a feedback signal proportional to the output voltage, a ramp generator to provide two ramp signals, and two comparators to generate two control signals according to the error signal and the two ramp signals to drive the power stage. By using feed-forward technique, one of the two ramp signals has a peak varying with the input voltage and the other ramp signal has a valley varying with the input voltage, so that the power converter has fast line response.

Abstract: A toothpick assembly includes a rectangular plastic envelope having a rectangular bottom, a rectangular upper top panel, a rectangular lower top panel, a rectangular left panel formed with a slit, and a rectangular right panel formed with a tongue configured to fit in said slit, and six plastic toothpick sheets each having six toothpicks separated at an upper portion and joined together at a root portion, a breaking line being pressed between said upper portion and said root portion, said plastic toothpick sheets being stacked up and affixed to said bottom panel, whereby the toothpick assembly is convenient to carry and sanitary in use.