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Leadtrend Technology Corporation

Tzu Chen Lin

Ming-Chang Tsou

A control method in use of a flyback power converter is disclosed to provide an operation power source supplying power to a power controller controlling a main power switch. The flyback power converter has a transformer with a primary winding and an auxiliary winding. The main power switch and the primary winding are connected in series. A chopper switch and a buffer inductor are connected in series between the auxiliary winding and the power controller. The power controller turns ON the main power switch for an ON time to energize the transformer, and turns ON the chopper switch for at least a time period during the ON time, so that during the time period the buffer inductor conducts an induced current flowing from the auxiliary winding and through the chopper switch, to build up the operation power source.

Flyback power converters and control methods thereof

Disclosed is a self-rotational exerciser including a fixed stand and a rotational frame freely rotatably connected to the fixed stand via two pivots. The rotational frame includes two elongated side posts, a seat lever connected to lower ends of the side posts, and a foot confining device downward extending from the seat lever for confining a user's feet thereto. A handle lever is connected between upper portions of the side posts for the user to grip. A stand-up position of the user on the rotational frame gives the rotational frame a center of gravity higher than the two pivots and therefore allows the rotational frame to rotate whenever the user tilts his/her body forward or backward. A sitting position or other positions of the user on the rotational frame that give the latter a center of gravity lower than the two pivots shall allow the rotational frame to stay in still either in a normal postion, an upside-down position, or an angularly inclined position. Without any help from an outcoming force, the rotational frame of the exerciser can be freely rotated or kept in still in any direction at different rotational speed just by the user's different body positions and movements of different parts of the body.

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Zhubei, Taiwan

Tzu Chen Lin