Abstract: A power module includes an outer shell, a circuit board, plural electronic components and a power transmission interface. The power transmission interface is electrically connected with the plural electronic components and partially exposed outside the outer shell. The outer shell includes a first lateral plate and a second lateral plate. The second lateral plate includes a first protrusion portion and a second protrusion portion. The first protrusion portion and the second protrusion portion are protruded relative to the first lateral plate and respectively located at two opposite edges of the second lateral plate. After fastening elements are respectively penetrated through a first fixing slot of the first protrusion portion and a second fixing slot of the second protrusion portion and tightened into a case of an electronic device, the power module is fixed and installed on an inner surface of the case.

Abstract: A power module includes an outer shell, a circuit board, plural electronic components and a power transmission interface. The power transmission interface is electrically connected with the plural electronic components and partially exposed outside the outer shell. The outer shell includes a first lateral plate and a second lateral plate. The second lateral plate includes a first protrusion portion and a second protrusion portion. The first protrusion portion and the second protrusion portion are protruded relative to the first lateral plate and respectively located at two opposite edges of the second lateral plate. After fastening elements are respectively penetrated through a first fixing slot of the first protrusion portion and a second fixing slot of the second protrusion portion and tightened into a case of an electronic device, the power module is fixed and installed on an inner surface of the case.

Abstract: The present invention is concerned with a switching power supply that utilizes an oscillator frequency tuner to broaden the maximum duty cycle of the switching control circuit and thus enhance its load driving capability. The oscillator frequency tuner includes a plurality of capacitors connected between a reference voltage output of the switching control circuit and a ground terminal, at least one bypass switch coupled across at least one of the capacitors for controlling the charging and discharging operation of the capacitor coupled therewith, and a bypass switch controller for controlling a switching state of the bypass switch. When the switching power supply is operating under a peak load condition, the bypass switch controller receives a feedback control signal and instructs the bypass switch to bypass current, and thus reducing the equivalent timing capacitance of the switching control circuit for increasing the maximum duty cycle of the switching control circuit.