Driving device and driving method of capacitive load and liquid jet printing apparatus
US7746127B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 1, 2008 |
| Grant date | Jun 29, 2010 |
| Priority date | — |
| Expiry date | Jan 19, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K7/08
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A driving device of a capacitive load includes a modulator that executes pulse modulation on a drive waveform signal. An inductor performs low-pass filtering on the modulated drive waveform signal and outputs the low-pass filtered signal as a drive signal towards a load capacitor as the capacitive load. A load selection control circuit selects a load capacitor and a dummy load capacitor to be connected to the inductor so that a sum of the capacitances of the selected load capacitor and dummy load capacitor is kept within a predetermined range. A feedback circuit executes a filtering process on the drive signal so that a frequency characteristic of a passing band of the drive signal becomes substantially flat. The resulting signal is provided to the modulator as a feedback signal. The modulator executes the pulse modulation on a difference value between the drive waveform signal and the feedback signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.