Abstract: A method and apparatus for modulating light of CCFLs that couples frequency alteration and pulse width modulation (PWM) approaches to change output voltage and current of a piezoelectric transformer to modulate the luminosity of a CCFL. The invention includes a PWM controller to alter operation cycle and a frequency control IC to change resonant frequency that drives the piezoelectric transformer at different operation cycles thereby to modulate the luminosity of the CCFL and improve the life span of the piezoelectric transformer.

Abstract: The present invention pertains to an inverter driving circuitry, which receives an input power signal from a power unit and outputs another power signal to drive a load to operate. The inverter driving circuitry is designed to be that a sinusoidal-wave signal generator receives a power signal, and outputs a sinusoidal-wave frequency signal to a signal amplifier in order to provide a gain and output a driving signal, and a transformer unit receives the driving signal to perform a power transformation and output another power signal to drive a load to operate. Thereby, the inverter driving circuitry of the present invention can take the place of a conventional design comprising pulse width modulators (PWM), power switches (MOSFET) and inductances (L), and achieves that the transformer unit is driven to operate by a standard sinusoidal-wave frequency driving signal.

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: Provided is a power supply apparatus in AV equipment. The apparatus is coupled to an AC input and comprises a first power circuit comprising a first rectifier coupled to the AC input for generating a rectified DC, a predetermined power supply unit, a first power supply unit being in parallel with the predetermined power supply unit and coupled to a grounded first load, and a switch coupled to both the power supply units; and a second power circuit being in parallel with the first power circuit and comprising a second rectifier coupled to the AC input for generating a rectified DC, and a second power supply unit coupled to a grounded second load. Both the first and second loads are activated by the first and second power supply units for prohibiting fluctuation voltage occurred on the second load from transmitting to and interfering with the first load.

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 power supply circuit device for eliminating electrical interference which is connected to an AC input and comprises a first power circuit comprising a first rectifier connected to the AC input for generating a rectified DC, a predetermined power supply unit, a first power supply unit being in parallel with the predetermined power supply unit and connected to a first load, and a switch connected to both the power supply units; and a second power circuit being in parallel with the first power circuit and comprising a second rectifier connected to the AC input for generating the rectified DC, and a second power supply unit connected to a second load. Both the first and second loads are activated by the first and second power supply units for prohibiting fluctuation voltage occurred on the second load from transmitting to the first load and interfering therewith.

Abstract: A silver contact fixing structure for conductive blades aims at providing a retaining force on a silver contact so that the silver contact is more secure and does not break loose when subject to striking. The silver contact is built in a fastening section formed on a conductive blade. The fastening section has at least two fixing zones connecting to each other and a bucking end adjacent to the fixing zones to increase the retaining force between the silver contact and the conductive blade so that the silver contact does not break loose easily thereby increasing the service life thereof.

Abstract: A scroll wheel device with a thin film type command switch mainly replaces conventional optical grating switch during rotation of a wheel for outputting a signal. The thin film type command switch is a flexible circuit board, and is provided with a circuit arrangement corresponding to a rotating trajectory of the wheel. The wheel is provided with a pressing portion which is simultaneously driven during rotation of the wheel and pressing the thin film type command switch for outputting different command signals. The thin film type command switch of the present invention can decrease the manufacturing cost and save the installation space of the scroll wheel device.

Abstract: A wheel type mechanical instruction switch employs a simple mechanical contact leg structure to replace conventional button switches to output instructions. The invention has a wheel coupling with a contact leg which is moveable to the left side and the right side with the movement of the wheel to form a selected displacement, and a conductive leg located respectively within the left and right displacement. When a force sways the wheel, the contact leg is moved to connect to the conductive leg to generate an instruction signal. The structure is easy to fabricate at a lower cost.

Abstract: A mechanical wheel instruction apparatus to replace the conventional wheel structure that uses a grating switch to output signal. The invention has a mechanical conductive terminal set to output instruction signals when become conductive. The apparatus of the invention has a wheel which has a rotation side with convex sections located on the perimeter in an equally spaced manner. Every two neighboring convex sections are interposed by a concave section. A base board is provided to electrically connect to a contact leg assembly which has a forward contact leg and a reverse contact leg located on the convex sections and a common contact leg located on the concave section. When the wheel is subject to a force and rotates, the convex section pushes the forward contact leg and the reverse contact leg to contact the common contact leg to output a forward rotation instruction and a reverse rotation instruction. The invention may be fabricated at a lower cost than the grating switch and save installation space.

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 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.

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: A power supply apparatus capable of providing medium voltage direct current to provide medium voltage and low voltage direct current includes a power supply input unit, a rectification unit and a conversion unit. The power supply input unit delivers AC voltage to the rectification unit which rectifies and outputs medium voltage DC. A portion of the medium voltage DC is further transformed by the conversion unit such that the whole DC power supply apparatus not only supplies low voltage power also directly supplies medium voltage power to enhance flexibility and efficiency of power supply for information appliances in the PC era.

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: An improved LCD back light panel lamp connecting structure arranges a high voltage end and a feedback end of adjacent cold cathode fluorescent lamp (CCFL) modules alternately, and the feedback end of the CCFL is coupled to a single return board. The return board is coupled to a pulse width modulation (PWM) control unit so that the two return boards feed back the current to the PWM control unit. The high voltage end of the CCFL is coupled to a transformer.

Abstract: An improved LCD back light panel lamp connecting structure comprises cold cathode fluorescent lamps (CCFL), and adjacent CCFL modules having high voltage ends and feedback ends arranged alternately, and the feedback ends on both sides of the CCFLs respectively coupled to two return boards. The feedback end of the CCFL is coupled to a proximate return board, and the return board is disposed separately at both ends of the CCFLs. Two return boards are coupled to a pulse width modulation (PWM) control unit so that the two return boards feed back the current to the PWM control unit. The high voltage end of the CCFL is coupled to a transformer.

Abstract: A piezoelectric blades anchoring structure includes an electric input leg which has a resilient end in contact with the piezoelectric blades in normal conditions and a connection end inserting in a circuit board. The resilient end is covered by a protection plate which also covers the electric contact of the piezoelectric blades and is bonded to the piezoelectric blades. The structure thus formed can prevent oxidation from taking place on the electric contact and the electric input leg, and protect the electric input leg from being damaged, and achieve improved electric connection between the piezoelectric blades and the circuit board.

Abstract: A current control apparatus for fluorescent lamps adopted for use on high voltage actuated a fluorescent lamp includes a high frequency pulse modulator to provide voltage distribution signals, a power switch which is a MOSFET to output actuation signals, a conversion unit to receive the voltage distribution signals and perform voltage transformation, a piezoelectric transformer to receive the transformed voltage and perform voltage transformer, and the fluorescent lamp connecting to the piezoelectric transformer. The high frequency pulse modulator obtains a feedback current from the output ends of the fluorescent lamps through the signal processor to redistribute current and maintain evenness of the current in the fluorescent lamp.