Abstract: An uninterrupted power supply with improved circuit arrangement includes a controller, a detecting circuit and a control circuit. When the incoming AC voltage is normal and in a positive half-wave cycle, an input pin of the controller detects the actual voltage level of the secondary voltage of a transformer. When the incoming AC voltage is in a negative half-wave cycle, the input pin of the controller receives a sinusoidal input waveform voltage based on the voltage Vcc which acts as a reference voltage, and the controller processes the sinusoidal input waveform voltage by subtracting the secondary voltage of the transformer from the voltage reference Vcc to obtain a sinusoidal half-wave voltage with positive half-wave cycle. The controller combines the positive and negative half-wave cycle signals to obtain a composite voltage, and then calculates the RMS value of the composite voltage so as to determine the changing situation of the incoming AC voltage.

Abstract: The present invention relates to an improving circuit of uninterruptible power system which especially improve the flyback circuit and charging circuit.

Abstract: An improved photoelectric sensor for an X-Y input device, the input device including vertical and horizontal slotted discs at ends of respective vertical and horizontal shafts, the discs being situated adjacent but not touching one another, is made up of a single photoelectric sensor and a single LED installed on opposite sides of the portions of the slotted discs that are adjacent each other, with the photosensor including four photoelectric sensor areas A, B, C, and D located on a single chip and having a width corresponding to the width of a slot or slotted wall of the slotted disc such that the rotation direction of the respective discs can be determined by whether the phase difference between signals generated by sensors A and B, and between signals generated by sensors C and D, is positive or negative.

Abstract: An improved uninterruptible power system including a UPS auto off circuit, a current limit protecting circuit, a power on overload protecting circuit, a simple charging circuit, a relay driver circuit, an external power voltage detecting circuit, a driver circuit, and a synchronizing circuit.

Abstract: An assembled photomechanical mouse structure including a bottom casing, an upper cover associated with the bottom casing, a circuit board enclosed by the bottom casing and upper cover, a ball member, two slotted discs, an idle roller, and a photoelectrical set composed of an LED and a double-chip phototransistor, wherein the bottom casing is integrally formed with stepped supports for fitting the circuit board thereon, two shaft posts and a roller support, and the circuit board is located on a front section of the bottom casing, extending from front end thereof only to the position of the slotted discs , on one side of the circuit board adjacent to the slotted discs being formed with an X direction and a Y direction rectangular slots whereby the LED and phototransistor are disposed on two opposite sides of each of the slots, the shaft post being formed with a shaft hole and a slant slide channel located thereabove, whereby the slotted disc can be pushed through the slant guide channels of two opposite shaft p

Abstract: A touch-control mouse provides rapid and accurate control of the positioning of a cursor on a computer display screen, and includes a laminated touch-control film assembly, an aluminum supporting board, a press button switch set, a signal processing circuit board, and a dust-protective hanging case. Drawing using a finger on x-axis and y-axis resistance planes of the laminated touch-control film assembly results in variable potential value for x, y coordinates. The value of potential variation is calculated through a single-chip microprocessor to indicate relative direction, speed and amount of displacement on x, y coordinates. The signal of the relative direction, speed and amount of displacement is further is further sent by the single-chip microprocessor through a standard RS-232 connector to one of the serial communications ports of a PC to rapidly and accurately control the positioning of the cursor on the computer display screen.