Pulse frequency modulation drive circuit for piezoelectric transformer
US6016052A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 3, 1998 |
| Grant date | Jan 18, 2000 |
| Priority date | — |
| Expiry date | Apr 3, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B70/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A pulse frequency modulation drive circuit (1114) for a piezoelectric transformer (1102) is provided. Circuit (1114) includes a piezoelectric transformer (1102) having a resonant frequency and an input and an output section. A frequency feedback network connected to the piezoelectric transformer (1102) and an output level sense (1112) connected to the piezoelectric transformer (1102) is also provided. A drive circuit (1114) has a first switch (S.sub.1) and a third switch (S.sub.3) having a capacitance (1118) therebetween. A second switch (S.sub.2) and a fourth switch (S.sub.4) connect a supply voltage (V.sub.IN) to each of a pair of inductors (L.sub.1 and L.sub.2) and the second switch (S.sub.2) and the fourth switch (S.sub.4) are driven 180.degree. out of phase at the resonant frequency of the piezoelectric transformer (1102).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.