Abstract: A feedback circuit for push-pull inverters aims to improve the existing push-pull inverters that provide input electricity to a discharge lamp at a phase difference of 180 degrees without feedback electricity to regulate frequency signals and cannot effectively control uniform luminance of the discharge lamp. The invention includes a feedback device to get a detection electricity of the driving electricity of the discharge lamp through non-contact coupling induction. The detection electricity is transformed by the feedback device and output to a frequency control unit. The control unit can regulate and output the frequency signal in response to the luminance of the discharge lamp to timely adjust input electricity of a push-pull inverter.

Abstract: The present invention discloses a push-pull inverter circuit comprising a transformer with a power output end coupled to a load and two power input ends, and a power driver unit is connected between the two power output ends and a power supply unit, and the power driver unit receives a power signal and outputs two sets of drive signals having same frequency and opposite phase to the two power input ends as to constitute an inverter circuit that adopts a push-pull voltage drive signal to drive the transformer to operate and improve the output power of the transformer.

Abstract: A multi-instruction transverse input device includes a hand-control unit and two anchor members located on two sides of the hand-control unit to generate instruction signals. The hand-control unit is mounted onto a base. Each anchor member includes a leg coupler which contains a plurality of legs. The hand-control unit is held on the base and movable transversely so that when it is moved leftwards or rightwards by user's hands, a first conductive element is compressed to form an electric connection on the leg coupler on each side. Thereby the screen picture is moved transversely. The invention is compact and simply structured, and can be fabricated and assembled easily.

Abstract: An input device with a multi-direction type scroll wheel includes a multi-direction command type switch and a scroll wheel for controlling the switch to output a command. The switch includes a base, a controller, and a pair of positioning bodies. An interior of each positioning bodies is provided with a contacting lead set. An interior of the scroll wheel provided with a guiding portion. When the scroll wheel is rotated forward or backward, moved leftward or rightward, or moved upward or downward, the controller is simultaneously moved by the guiding portion in accordance with the motion of the scroll wheel, thereby electrically connecting the contacting lead sets so as to generate various command signals. The prevent invention achieves the object of outputting various command signals by utilizing multi-direction operation of a single scroll wheel and has the advantages of minimization, simple structure and assembly, and easy operation.

Abstract: A gas discharge lamp dimming control method aims to provide a dimming period after a start period when a gas discharge lamp is ignited. The dimming period has a duty voltage set initially or corresponding to a remained dimming value in a pervious OFF condition of the gas discharge lamp. Hence the gas discharge lamp is provided with electric energy and maintained in a start condition in the dimming period at any dimming value setting. The duty voltage during the dimming period lasts a length equal to that of the dimming period to allow the gas discharge lamp to gradually restore the required dimming illumination in the start condition and achieve a maximum dimming range.

Abstract: An electrically connecting structure of piezo-electric plates includes a circuit board and a plurality of piezo-electric plates disposed on and electrically connected to the circuit board. Anodes of power input of the piezo-electric plates of the present invention are individually electrically connected to the circuit board, the cathodes of power input of the plurality of piezo-electric plates are electrically connected together for forming a circuit of power input of electrical connection of the plurality of piezo-electric plate and the circuit board.

Abstract: An unevenly illuminated keyboard has a mask element between a luminous element and keycaps which are illuminated by the luminous element. The mask element has a permeable zone corresponding to each keycap and an impermeable zone on the neighboring area of the keycap but not beneath thereof such that the light emitted from the luminous element projects and illuminates the individual keycap to form the unevenly illuminated keyboard that illuminates only the keycaps.

Abstract: An audio/video playback control system of liquid crystal display television (LCD TV) is provided to control an audio signal system, an image display system and a backlight source system of an LCD TV, and the control system uses an audio/video control unit to maintain an activated status in normal conditions, and the audio/video control unit receives a signal transmitted from an external control interface to determine whether or not to output an activate signal to activate the audio processing unit or activate the video processing unit and the backlight source system, or jointly activate the audio processing unit, the video processing unit and backlight source system, so as to achieve the digital control of the LCD TV and the power-saving purpose.

Abstract: A means for being electrically connected to an electrode of a piezo-electric plate is adapted for connecting the piezo-electric plate to a circuit board disposed under the piezo-electric plate. The piezo-electric plate and the circuit board are respectively provided with a first electrode and a second electrode corresponding to the first electrode. The means includes a conductive element and an elastic element. The conductive element includes at least two connecting surfaces electrically connected to each other and respectively electrically connected to the first electrode and the second electrode. The elastic element is joined with the conductive element and located between the piezo-electric plate and the circuit board.

Abstract: An electrically connecting structure of piezo-electric plates includes a circuit board and a plurality of piezo-electric plates disposed on and electrically connected to the circuit board. Anodes of power input of the piezo-electric plates of the present invention are individually electrically connected to the circuit board, the cathodes of power input of the plurality of piezo-electric plates are electrically connected together for forming a circuit of power input of electrical connection of the plurality of piezo-electric plate and the circuit board.

Abstract: A gas discharge lamp dimming control method aims to provide a dimming period after a start period when a gas discharge lamp is ignited. The dimming period has a duty voltage set initially or corresponding to a remained dimming value in a pervious OFF condition of the gas discharge lamp. Hence the gas discharge lamp is provided with electric energy and maintained in a start condition in the dimming period at any dimming value setting. The duty voltage during the dimming period lasts a length equal to that of the dimming period to allow the gas discharge lamp to gradually restore the required dimming illumination in the start condition and achieve a maximum dimming range.

Abstract: A piezoelectric blade protection structure for a plurality of juxtaposed piezoelectric blades mounting onto a circuit board to provide protection and anchoring effect for the piezoelectric blades. A protection member is mounted onto the vibration nodes of the piezoelectric blades to prevent the piezoelectric blades from broken by improper impact of external forces. The protection member, piezoelectric blades and circuit board are interposed respectively by a upper elastic element and a lower elastic element to provide a desired vibration space and anchoring for the piezoelectric blades.

Abstract: A pulsating current inverter control circuit aims to convert AC power provided by an external electric source to a pulsating current through a rectification unit. The inverter has a control unit outputting an operation frequency to an actuation unit to divide the pulsating current to a plurality of electric pulse waves to drive a transformer to perform voltage transformation and drive a load. An inspection unit has a preset reference electricity value to compare with the pulsating current and output an activation signal and a deactivation signal to activate or deactivate the actuation unit. The transformer stops performing voltage transformation while the actuation unit is deactivated. Thus the transformer can output power to drive the load. The inspection unit can output a comparison signal to the control unit to alter the conductive interval of the operation frequency so that the inverter can output steady electricity in different AC environments.

Abstract: A piezoelectric power supply has a piezoelectric transformer circuit configuration which is alterable flexibly according to varying loading power requirements. It includes a control unit (control IC), a power switch (MOSFET) and an inductor to drive a piezoelectric transformer unit to actuate a high voltage and power load such as a cold cathode fluorescent lamp. The piezoelectric transformer unit consists of a plurality of piezoelectric transformers coupled in parallel. The specification of the piezoelectric transformers (single sheet piezoelectric transformers or low level laminated piezoelectric transformers) and parallel coupling number may be altered according to the required power of the load to change the voltage and current output by the piezoelectric transformers.

Abstract: The present invention discloses a power driver circuit of display panel. The present invention adopts a power controller, and a resident power system, which is coupled to an alternating power source, provides resident power for the power controller. When receiving an external on/off signal, the power controller will output driving signals to initiate or close the low-voltage power converter system and the high-voltage power converter system to determine whether a low-voltage power and a high-voltage power are output to drive the display panel. Thereby, when the display panel is in off state, only the resident power system works. Thus, the power-saving demand of environmental protection is satisfied.

Abstract: A method for controlling an inverter under altering voltage aims to change the electric conductive interval of the electric conductive cycle of the inverter corresponding to alteration of an input voltage so that the dimming duty cycle, electric conductive cycle and transformer oscillation duty cycle of the inverter can be maintained at a selected level. Thereby when the input voltage is altered, the existing dimming range can be maintained and actuation electricity output is stabilized. The transformer can be protected and the life span of the load can be extended.

Abstract: A pulsating current inverter control circuit aims to convert AC power provided by an external electric source to a pulsating current through a rectification unit. The inverter has a control unit which outputs an operation frequency to an actuation unit to divide the pulsating current to a plurality of electric pulse waves to drive a transformer to perform voltage transformation and drive a load. The invention further includes an inspection unit which has a preset reference electricity value to compare with the pulsating current and output an activation signal and a deactivation signal to activate or deactivate the actuation unit so that the transformer stops performing voltage transformation while the actuation unit is deactivated. Thus the transformer can output power to drive the load as desired.

Abstract: The present invention pertains to a method of determining a working voltage of an inverter, which utilizes a rectifying method to transform an alternating current into a pulse direct current, and then via a working frequency, divides a direct current cycle, which ranges in a lowest voltage–highest voltage–lowest voltage manner, into multiple continuous voltage pulses. The inverter receives each one of the multiple continuous voltage pulses and acts in response to each one of the multiple continuous voltage pulses and corresponding to the voltage cycle ranging between the lowest voltage and the highest voltage to output a variable voltage signal to a load. Thus, the working voltage of the inverter is analogous to the input voltage of the alternating current, and a power-factor regulating effect can be accomplished directly by the inverter.

Abstract: A detachable backlight module of LCD TV comprises a casing with a detaching opening, a screen disposed in the front section of the casing, a detachable lamp rack disposed behind the screen and corresponding to the detaching opening, and a main circuit board disposed behind the detachable lamp rack; the main circuit board drives an illumination unit on the detachable lamp rack to evenly diffuse the light produced by the illumination unit through the screen to a plane light source and the detachable lamp rack can be detached from the detachable opening easily, and the foregoing constitute the detachable backlight module of a LCD television.

Abstract: A piezoelectric blade anchoring structure includes piezoelectric blades mounting onto a circuit board. The piezoelectric blade has electric contacts to connect electrically with conductive members located on the circuit board. A protection plate is provided to keep the conductive member in contact with the electric contact in normal conditions to avoid gaps from occurring between the piezoelectric blades and the conductive members and resulting in breaking off, and prevent oxidation and damage so that the piezoelectric blades and the circuit board can maintain a desired electric connection.