Midas Wei Trading Co., Ltd.

Champion Elite Company Limited

Miezo Inc.

Simtrans Tech Inc

Yuan-Ping Liu

Kai-wen Cheng

Tao-Chin Wei

Wei-Ren Lai

Chao-Ting Wu

Wei-Hsun Wang

Chiao-Yu Hsiao

Chung-chun Ho

Wen-Jong Wu

Nai-Chang Wu

Chang-Heng Tsai

Yi Cheng Liu

Tao-chin Wei

Yi-Cheng Liu

An electrostatic discharge device including at least two conductive materials isolated from each other and at least one electrostatic eliminator. The conductive materials are located outside two opposite side walls of an insulated fluid-carrying member and separated from the side walls thereof. When electrostatic charges are accumulated on the insulated fluid-carrying member, the electrostatic charges form an electrostatic voltage on the conductive materials. The electrostatic eliminator is electrically connected to the conductive materials and directly disconnected from a grounding terminal. The electrostatic eliminator releases and eliminates the electrostatic charges by the conductive materials to reduce the electrostatic voltage. In addition, the insulated fluid-carrying member can also be replaced by an insulation container. When the insulation container is used, induction electrodes can replace the conductive materials in the insulation container. The electrostatic discharge device effectively releases static electricity and avoids noise interference from the grounding terminal.

Discharge device

An electrostatic discharge device includes at least two conductive materials and at least one electrostatic eliminating circuit. The conductive materials are attached to the outer wall of an insulating hollow tube. The conductive materials separate from each other and overlap in a radial direction of the insulating hollow tube. Static charges are accumulated on the insulating hollow tube to form an electrostatic voltage across the conductive materials. The electrostatic eliminating circuit is electrically connected to the conductive materials and disconnected from a grounding terminal. The electrostatic eliminating circuit receives and eliminates the static charges through the conductive materials to reduce the electrostatic voltage.

Electrostatic discharge device

A composite case of an airborne ultrasonic transducer for transmitting, receiving, or both of ultrasound in atmospheric environment at an ultrasound pressure level is disclosed. The case comprises a first case component and at least a second case component. The second case component is made of a material different from the first case component having an acoustic impedance smaller than that of said first case component and is structurally connected to the first case component for reducing said mechanical quality factor while maintaining said ultrasound pressure level. The connection between the first and second case components is by strong bonding at an interface between the components so that the strong bonding forms a composite structure for the case.

Ultrasonic transducer with composite case

USB connector

The present invention discloses a piezoelectric loudspeaker. The piezoelectric loudspeaker comprises a sound producing plate, a resonant sound-box, a surround and a reflective sound-box. The sound producing plate comprises a piezoelectric ceramic element. The resonant sound-box includes a first opening comprising a first carrying part. The sound producing plate is disposed on the first carrying part. A cavity resonator is formed between the sound producing plate and the resonant sound-box. The surround is disposed between the first carrying part and the sound producing plate. The reflective sound-box includes a second opening and a reflective output opening. The second opening comprises a second carrying part. The resonant sound-box is disposed on the second carrying part. A reflective cavity body is formed between the resonant sound-box and the reflective sound-box, and the reflective cavity body is connected the reflective output opening.

Piezoelectric loudspeaker

A zero-voltage-switching (ZVS) piezoelectric driving circuit, suitable for use in a switching type power converter. It receives an input DC voltage from a half-bridge driving circuit, and through switching of an high-side switch set and a low-side switch set of the half-bridge driving circuit, converts it to an AC voltage and provides it to a piezoelectric element to drive a load. Wherein, a shunt circuit is connected electrically between the half-bridge driving circuit and the piezoelectric element for zero-voltage-switching (ZVS). Namely, when the high-side switch set and the low-side switch set are both switched off, the shunt circuit resonates with its parasitic capacitance, so that the high-side switch set and the low-side switch set perform ZVS, thus realizing ZVS in a wide range of frequency and a large range of load.

Zero-voltage-switching (ZVS) piezoelectric driving circuit

A piezoelectric resonant LED driving circuit, wherein a rectifier is used to rectify an AC voltage provided by the supply main into a DC voltage. Then, a quasi-resonant switching module performs resonance by means of the DC voltage to produce an induced current, to raise resonance frequency to operation frequency of a piezoelectric oscillator. Finally, the piezoelectric oscillator performs resonance and filtering using the induced current, to generate a sine wave current. Then, the sine wave current is rectified to output a DC current to drive an LED module.

Piezoelectric resonator light-emitting-diode (LED) driving circuit

Growing community of inventors

Taipei, Taiwan

Yuan-Ping Liu