公开(公告)号：WO1998034286A1

公开(公告)日：1998-08-06

申请号：PCT/US1997020384

申请日：1997-11-04

Applicant: MOTOROLA INC.

Inventor： MOTOROLA INC. ,  HUANG, Jin ,  MIDYA, Pallab ,  MANCINI, Brian, M.

IPC: H01L41/08

CPC classification number: H01L41/044 ,  H01L41/107

Abstract: A transformer circuit (10) for a piezoelectric transformer (12) having dual inputs which can piezoelectrically interfere with one another to provide adjustable output gain. The transformer circuit (10) provides two pulse-position-modulated input signals (18, 20) which are substantially identical waveforms, but being phase shifted from one another. When the signals (18, 20) constructively interfere maximum gain is achieved. When the two signals (18, 20) destructively interfere minimum gain is achieved. The waveforms may be of any arbitrary type including square, sine, triangle, sawtooth or irregular. Both input signals (18, 20) are at a resonant frequency of the piezoelectric transformer (12) and have a fifty percent duty cycle so as to always provide highest efficiency within the transformer (12). In addition, when the two input signals (18, 20) destructively interfere with each other piezoelectrically, the input impedance of the transformer (12) rises so as to lessen power dissipation within the transformer (12) which subsequently reduces adverse heating effects.

Abstract translation: 一种用于压电变压器（12）的变压器电路（10），具有可以彼此压电干扰以提供可调输出增益的双输入。 变压器电路（10）提供两个脉冲位置调制的输入信号（18,20），它们是基本相同的波形，但彼此相移。 当信号（18,20）构造上干扰最大增益时。 当两个信号（18,20）破坏性地干扰最小增益时。 波形可以是包括正方形，正弦，三角形，锯齿形或不规则的任意类型。 两个输入信号（18,20）处于压电变压器（12）的谐振频率处，并具有百分之五十的占空比，从而始终在变压器（12）内提供最高的效率。 此外，当两个输入信号（18,20）以压电方式相互干涉地干扰时，变压器（12）的输入阻抗上升，以便减小变压器（12）内的功率耗散，从而降低不利的加热效应。

公开(公告)号：WO1997032345A1

公开(公告)日：1997-09-04

申请号：PCT/US1996019796

申请日：1996-12-13

Applicant: MOTOROLA INC.

Inventor： MOTOROLA INC. ,  HUANG, Jin ,  MANCINI, Brian, M.

IPC: H01L41/08

CPC classification number: H01L41/107

Abstract: A piezoelectric transformer (10) operating in a thickness-shear vibration mode (26). The piezoelectric transformer (10) comprises a lithium niobate substrate (12) having first and second acoustically coupled portions (16, 22), and a plurality of substantially opposing pairs of primary and secondary electrodes (14, 20) disposed thereon. An input AC voltage applied to the primary electrode pairs (14) exciting a thickness-shear vibration (26) which couples to the secondary electrode pairs (20) producing an output AC voltage therebetween. The primary and secondary electrodes (14, 20) being electrically connected in various combinations of parallel and series connections to provide a desired step-up or step-down voltage transfer ratio.

Abstract translation: 一种以厚度 - 剪切振动模式（26）工作的压电变压器（10）。 压电变压器（10）包括具有第一和第二声耦合部分（16,22）的铌酸锂衬底（12），以及设置在其上的多个基本相对的初级和次级电极对（14,20）。 施加到主电极对（14）的输入AC电压激励耦合到次级电极对（20）的厚度 - 剪切振动（26），从而在它们之间产生输出AC电压。 初级和次级电极（14,20）以并联和串联连接的各种组合电连接以提供期望的升压或降压电压传递比。