Abstract: A fan motor control device comprises a clock signal generator and a drive unit. The clock signal generator generates a low-frequency clock signal. A frequency of low-frequency clock signal is less than 23 KHz. The drive unit converts the low-frequency clock signal to a high-frequency drive signal and outputs the high-frequency drive signal to drive the fan motor. A frequency of the high-frequency drive signal is higher than 23 KHz.

Abstract: A cable winding mechanism with reduced friction includes a cable, a case, a reel disc, a spring device, a roller and a friction-reducing member. The case includes a first case element and a second case element, wherein a cable locking structure is formed in an inner surface of the second case element. The reel disc has a confining groove. The roller is movable along the confining groove of the reel disc. When a pulling operation of the cable causes the roller to move in the cable locking structure of the second case element, a desired length of the cable is pulled out and locked. When the roller is detached from the cable locking structure, the cable pulled outside the case is rewound on the reel disc. The friction-reducing member is disposed on the reel disc for reducing friction during the process of pulling out or rewinding the cable.

Abstract: An active droop current sharing technique combined with current limiting function is employed in a parallel power supply. The parallel power supply is characterized with a current sensing amplifier that generates a current feedback signal representing a difference between a nominal output voltage and a fractional output voltage. The current sensing amplifier is coupled to a threshold level generator providing a threshold level defining a voltage level corresponding to a maximum allowed output current of the parallel power supply. If the voltage level of the current feedback signal exceeds the threshold level, the threshold level generator is turned on and the current feedback signal is coupled to a switching controller to adjust the output voltage of the power converter for properly addressing the current imbalance among plural parallel power supplies.

Abstract: An inverter system includes a comparator unit receiving an analog input voltage signal and compared with at least one threshold voltage value to determine a voltage range of the analog input voltage signal. An amplifier unit receives and amplifies the analog input voltage signal. A feedback-controlling gain unit adjusts a voltage gain of the amplifier unit according to the voltage range of the analog input voltage signal. An analog-to-digital converter unit converts an analog signal outputted from the amplifier unit into a digital count. A microcontroller unit is electrically connected with the analog-to-digital converter unit and the comparator unit. The microcontroller unit receives an indicating signal outputted from the comparator unit to know the voltage range of the analog input voltage signal. The microcontroller unit receives a digital count outputted from the analog-to-digital converter unit to correctly calculate an original value of the analog input voltage signal.

Abstract: Disclosed is an uninterruptible power supply including a controller; a first switch circuit; a second switch circuit; a transformer having a first winding connected to a load and the first switch circuit and a second winding connected to the second switch circuit; an energy accumulation device; a DC-DC converter for boosting a DC voltage outputted from the energy accumulation device; an inverter for converting a boosted DC voltage into a first AC voltage and delivering the AC voltage to the first winding. When the energy accumulation device is supplying power, the second winding generates a second AC voltage in response to the first AC voltage, thereby the second AC voltage can regulate the voltage level of the first AC voltage which is delivered to the load according to the connection status between the second switch circuit and the second winding.

Abstract: The present invention relates to a surface-mount connector for electrically interconnecting a first circuit board and a second circuit board. The surface-mount connector includes a first end part and a second end part. The first end part is bonded onto the first circuit board. The second end part has a sidewall and a receptacle defined within the sidewall for receiving a solder bump therein. The solder bump is partially protruded from the sidewall and bonded onto the second circuit board such that the first circuit board and the second circuit board are electrically connected to each other.

Abstract: A projection device is provided. The projection device comprises a heat source, a housing, and a cooling system. The cooling system is disposed inside the housing of the projection device. The housing comprises at least one outlet and at least one inlet. The cooling system comprises a first cooling device and a second cooling device, wherein the first cooling device is adapted to guide the air outside the housing from the inlet to the outlet, while the second cooling device is disposed adjacent to the outlet and inhales the air outside the housing through the outlet to cooperatively dissipate the heat generated by the heat source of the projection device.

Abstract: A fan housing. The fan housing mounted on a frame of a system includes a main body, a first section, a second section and a fixing portion. Both the first and second sections are disposed on the main body. A gap is formed between the first and second sections. The fixing portion is formed in the gap.

Abstract: A dual motor structure of a dual fan includes a first stator structure, a first rotor structure, a first bearing, a second stator structure, a second rotor structure and a second bearing. The first stator structure has a first bearing tube. The first rotor structure has a first shaft inserted into the first bearing tube. The first bearing is telescope onto the first shaft, and is mounted in the first bearing tube. The second stator structure has a second bearing tube. The second rotor structure has a second shaft inserted into the second bearing tube. The second bearing is telescope onto the second shaft, and is mounted in the second bearing tube. The first shaft is positioned corresponding to the second shaft to generate a magnetic interaction therebetween.

Abstract: A bathroom ventilator fan with the soft-start function includes an impeller and a motor. The motor is coupled to the impeller for driving the impeller to rotate. The motor has a control module for driving and controlling the rotation speed of the motor according to a soft-start signal. The soft-start signal includes a soft-start section and a target-driving section. The control module slowly increases the rotation speed of the motor from the soft-start section to reach the target-driving section.

Abstract: A motor and a motor speed control system are disclosed. Two power signal lines and one feedback/speed-control signal line are coupled between a control device and the motor. The two power signal lines electrically connect the control device to the motor. The feedback/speed-control signal line bi-directionally transmits signals coming from the control device to the motor and from the motor to the control device.

Abstract: A contrast adjustable projector apparatus including a body, a light source, an illumination unit, a lens assembly and a regulation device is disclosed. The light source is disposed in the body for generating light beams. The illumination unit connects the light source and the lens assembly to guide the light beams to project onto the lens assembly. The illumination unit includes a digital micromirror device (DMD) which is controlled by a controller to rotate at a specific angle according to the transmitted signals, thereby projecting the light beams transmitting from the light source as an on-state light, a flat state light or an off-state light. The regulation device is provided at an outer side of the lens assembly to adjustably shield at least a part of flat state light which is incident to a light inlet, in order to the contrast of the light emitted out of the lens assembly.

Abstract: A heat dissipating system includes a fan set and a monitoring module. The fan set has at least one fan. The monitoring module has at least one sensing unit, a controlling unit and a setting unit. The setting unit sets a plurality of parameter values. The controlling unit controls a rotation speed of the fan according to the parameter values and/or at least one measured value sensed by the sensing unit.

Abstract: The present invention discloses a power supply device with low standby loss. The power supply device comprises a main power converter and an auxiliary power converter. The main power converter comprises a bulk capacitor. The main power converter connects parallelly with the auxiliary power converter. When the power supply device is in a standby mode, the main converter is turned off and the auxiliary converter provides the output to the outputting load and the bulk capacitor. Moreover, when the power supply device is in a normal mode, the main converter and the auxiliary converter together provide the output to an outputting load. Under a normal mode, the main converter provides most of the power and the auxiliary converter operates in a power-limited finite value such that the topology of the power supply device achieves a low standby loss.

Abstract: An electronic device includes a main body, a plug and a fixing member. The main body includes a plug-receiving portion and a plurality of conductive portions. The plug-receiving portion is defined by a first sidewall, a second sidewall and a bottom surface. The first sidewall is opposed to the second sidewall. The bottom surface is connected to the first sidewall and the second sidewall. An inclined angle between the bottom surface and at least one of the first sidewall and the second sidewall is smaller than 90 degrees. The plug includes a plurality of conductive terminals, a first slant corresponding to the first sidewall, and a second slant corresponding to the second sidewall. The fixing member is used for facilitating fixing the plug in the plug-receiving portion of the main body such that the conductive terminals of the plug are electrically connected to the conductive portions of the main body.

Abstract: A motor includes a motor body and a housing for covering and accommodating the motor body. The housing includes a seat and a cover. The seat has at least one first connecting portion disposed at the circumference of the seat, and the cover has at least one second connecting portion disposed at the circumference of the cover and corresponding to the first connecting portion. The first and second connecting portions are connected by the relative movement of the seat and the cover, so that the seat and the cover can be combined tightly.

Abstract: A transformer. The transformer comprises a bobbin, a first core and a second core. The bobbin comprises a primary winding area and a secondary winding area. The first core is disposed in the bobbin. The second core is mounted on the bobbin. The second core comprises a plurality of first protrusions which are disposed at two sides of the bobbin. A second protrusion is integrally formed on the second core and is disposed between the first protrusions. The second protrusion is disposed between the primary winding area and the secondary winding area.

Abstract: A heat dissipation module includes a first heat dissipation apparatus, a second heat dissipation apparatus, and a flow direction controlling structure. The first heat dissipation apparatus and the second heat dissipation apparatus are symmetrically disposed. The flow direction controlling structure has several rotatable elements disposed between the first heat dissipation apparatus and the second heat dissipation apparatus. Each of the rotatable elements has a fixed end and a correspondingly movable end for guiding airflow. The rotatable elements can be sheet-shaped, wing-shaped, arc-shaped or nonlinear in cross section. The thickness of the rotatable elements varies or decreases from the fixed end to the movable end. The rotatable elements overlap an adjacent rotatable element so as to selectively seal the heat dissipation apparatuses.

Abstract: A controlling apparatus for gate driving signal controls a gate of a power unit through a photo coupler includes a processor, a gate-controlling IC electrically connected to the processor and sending a gate driving signal of the processor to the gate, a transistor switch electrically connected to the photo coupler, and an isolation multiple input unit. The isolation multiple input unit has one output end connected to the processor, and connected to the gate-controlling IC through a hardware enable jumper. The transistor switch is controlled by a second control signal to turn off the gate. When hardware enable jumper is removed, the isolation multiple input unit is able to disable the gate-controlling IC for safety concern. When safety is not concern, the hardware enable jumper can be mounted to enable the gate-controlling IC. At this moment, the isolation multiple input unit can provide addition input.

Abstract: A chip package mechanism. A substrate is disposed in a receiving chamber of a base. A chip is disposed on a target surface of the substrate. A plurality of supporting elements is disposed on the target surface and surrounds the chip. A gap for receiving the chip is created in the receiving chamber and between the target surface and the base by means of the supporting elements. A barricade is disposed in the gap to separate glue filled in the receiving chamber from contacting the chip. Outside water and particles cannot enter the chip package mechanism. The chip thus has a prolonged lifespan after packaged in the chip package mechanism.