Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1998-12-17
1999-11-16
Han, Y. J.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310366, 363 15, 363 95, H01L 4108, H02M 322
Patent
active
059863846
ABSTRACT:
A self-oscillation type signal converter includes a piezoelectric ceramic, four electrodes P.sub.A, P.sub.B, Q.sub.C and Q.sub.D, a load resistance R consisting of N parts R.sub.i (i=1, 2, . . . , N), N-1 terminals T.sub.i {i=1, 2, . . . , (N-1)} between two parts R.sub.i and R.sub.(i+1), two terminals T.sub.0 and T.sub.N, formed on the electrodes Q.sub.C and Q.sub.D, respectively, a switch, a vibration circuit connected between the electrodes P.sub.A and P.sub.B, and a rectification circuit connected between two of all the terminals T.sub.0, T.sub.i and T.sub.N, via the switch. The electrodes P.sub.A, P.sub.B, Q.sub.C and Q.sub.D are formed on four side surfaces A, B, C and D, of the piezoelectric ceramic, respectively. The load resistance R is connected between the terminals T.sub.0 and T.sub.N. The piezoelectric ceramic, the electrodes P.sub.A, P.sub.B, Q.sub.C and Q.sub.D, form a piezoelectric vibrator. When a high-frequency electric signal E.sub.IN with a voltage V.sub.IN is applied to the electrodes P.sub.A and P.sub.B from the vibration circuit, the piezoelectric vibrator is vibrated. An acoustic vibration in the piezoelectric vibrator is transduced to an electric signal E.sub.OUT with a voltage V.sub.OUT. The voltage V.sub.OUT is equal to the sum of N voltages V.sub.i (i=1, 2, . . . , N) corresponding to the parts R.sub.i, respectively. Thus, a pair, composed of two of all the terminals T.sub.0, T.sub.i and T.sub.N, delivers an electric signal, with a voltage between two terminals which make the pair, toward the rectification circuit via the switch The rectification circuit rectifies the electric signal delivered from the pair of terminals, and generates a direct current power.
REFERENCES:
patent: 4939402 (1990-07-01), Hirayama et al.
patent: 5329200 (1994-07-01), Zaitsu
patent: 5424935 (1995-06-01), Wu
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