Title:
A SAWTOOTH WAVE GENERATING APPARATUS, A METHOD OF GENERATING SAWTOOTH WAVE, A CONSTANT CURRENT CIRCUIT, AND A METHOD OF ADJUSTING AMOUNT OF CURRENT FROM THE SAME
Document Type and Number:
WIPO Patent Application WO2004062104
Kind Code:
A3
Abstract:
A sawtooth wave generating apparatus 1 includes a base frequency generating section 10 and a frequency generating section 20 for generating the frequency of a reference signal, a sawtooth wave forming section 30 which forms a sawtooth wave based on the reference signal, a voltage comparator 60 which compares the voltage value of the sawtooth wave formed by the sawtooth wave forming section 30 with a predetermined voltage value, a phase comparator 70 which compares the phase of the output signal from the voltage comparator 60 with the phase of the reference signal, and a low-pass filter (LPF) 80 which cuts out a high frequency component of the output signal from the phase comparator 70, and feeds back the resulting output signal to the sawtooth wave forming section 30.
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Inventors:
TAKEUCHI KESATOSHI (JP)
Application Number:
PCT/JP2003/016823
Publication Date:
October 14, 2004
Filing Date:
December 25, 2003
Export Citation:
Assignee:
SEIKO EPSON CORP (JP)
TAKEUCHI KESATOSHI (JP)
TAKEUCHI KESATOSHI (JP)
International Classes:
H03K4/50; H03K4/501; H03K4/502; H03L7/099; H03K3/0231; (IPC1-7): H03K4/00
Domestic Patent References:
| WO1993024996A1 | 1993-12-09 |
Foreign References:
| US5455493A | 1995-10-03 | |||
| EP0574982A1 | 1993-12-22 | |||
| US6369665B1 | 2002-04-09 | |||
| DE3607217A1 | 1987-09-10 | |||
| US6147550A | 2000-11-14 | |||
| US5469092A | 1995-11-21 | |||
| US5083079A | 1992-01-21 |
Other References:
KNOPPER G J: "TRIGGERED SAWTOOTH GENERATOR", ELEKTOR ELECTRONICS, ELEKTOR PUBLISHERS LTD. CANTERBURY, GB, vol. 17, no. 191, 1 July 1991 (1991-07-01), pages 66 - 67, XP000235698, ISSN: 0268-4519
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