Abstract:
The present invention relates to a control system for an electrostatically-driven microelectromechanical device, which uses multiple electrodes to control the microelectromechanical device, i.e. the lower driven electrode of a capacitor with known two parallel driven electrodes is cut into a number of small electrodes. By selecting an electrode pattern for a desired electrostatic force, it is capable of altering the non-linearity of the device based on various applications and achieving a characteristic such as a linear driven, digital driven, or ultimately optimal driven manners, which is able to reach high operation accuracy for the existing circuit that only possesses a limited accuracy.
Abstract:
A smart electric heating device comprises a storage unit, a first heating unit, a second heating unit, a control unit and a first temperature sensing unit. With the first temperature sensing unit to obtain an ambient temperature, the control unit compares the ambient temperature with a maximum increased temperature and a set temperature for controlling the first heating unit and the second heating unit to actuate. In this way, each user can use hot water of sufficient temperature better.
Abstract:
A cooling fan (100) includes a frame (10), a circuit board (20) and a rotor (30). The frame includes a housing (12) and a plate (14) connecting with the housing. The circuit board is mounted on the plate. The rotor is received in the housing and includes a hollow hub (32) and a plurality of blades (38) extending from the hub. A plurality of light emitting diodes (40) is mounted on the circuit board. When the rotor rotates, each LED projects light towards the rotor and to the frame so that the light will be reflected and deflected by the fan whereby the whole fan glows and produces a fantastic visual effect.
Abstract:
A heat dissipation device (100) comprises a heat sink (10) and a fan (40) mounted on the heat sink (10). The heat sink (10) comprises a central core (12), a plurality of branches (122) radially extending outwardly from a periphery of the core (12) and a plurality of fins (14) extending from of the core (12) and the branches (122). The fan (40) comprises a plurality of blades (404). The branches (122) and the fins (14) extend and are oriented in a direction opposite to a rotation direction of the blades (404) of the fan (40).
Abstract:
A smart electric heating device comprises a storage unit, a first heating unit, a second heating unit, a control unit and a first temperature sensing unit. With the first temperature sensing unit to obtain an ambient temperature, the control unit compares the ambient temperature with a maximum increased temperature and a set temperature for controlling the first heating unit and the second heating unit to actuate. In this way, each user can use hot water of sufficient temperature better.
Abstract:
A heat dissipation device includes a heat conducting member (10) adapted for contacting with a heat generating electronic device and a fin unit (30). The fin unit defines a central hole (300) therein and consists of a plurality of fins (31) around the central hole and clasping each other. The fin unit fits around a periphery of the heat conducting member via the heat conducting member extending in the central hole of the fin unit. A clip (40) engages with the heat conducting member and the fin unit for providing a pressure to the fin unit such that the fin unit is intimately fastened to the heat conducting member.
Abstract:
A heat sink includes a base plate and a plurality of thin-sheet fins. The base plate has a plurality of recesses and protruding ribs formed between every two recesses. The protruding ribs are spaced by the respective recesses with an equal space. Each thin-sheet fin comprises a folded engaging portion and a dissipating portion connecting with the engaging portion. The engaging portion has a first extending portion and a second extending portion parallel to the first extending portion and connecting with the first extending portion. The engaging portions are inserted into the recesses of the base plate and abut against a bottom of the recesses.
Abstract:
A heat sink includes a first array of fins defining a plurality of first channels therebetween, a second array of fins disposed at opposite sides of the first array of fins, and a plurality of grooves extending through the first array of fins and the second array of fins. The second array of fins defines a plurality of second channels therebetween. The grooves are intersected with the first channels and the second channels. A bottom extremity of each groove has a curved shape facing upwardly and laterally. A portion of an airflow generated by a fan mounted on a top of the heat sink flows laterally and downwardly through the grooves to leave the heat sink.