{
  "$type": "site.standard.document",
  "description": "Pulse signal generating circuitry (120) generates a pulse signal (iii) for the primary side of a piezoelectric transformer (101). A voltage dependent upon the frequency of the pulse signal is output from the secondary side. The circuitry compares an output voltage (Vout) with a target voltage and…",
  "path": "/patents/1011460",
  "publishedAt": "2011-06-29T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "G03G21/00",
    "CANON KK [JP]"
  ],
  "textContent": "Pulse signal generating circuitry (120) generates a pulse signal (iii) for the primary side of a piezoelectric transformer (101). A voltage dependent upon the frequency of the pulse signal is output from the secondary side. The circuitry compares an output voltage (Vout) with a target voltage and changes the frequency of the pulse signal (iii) in dependence upon the comparison results. In a fine adjustment operation the pulse-signal frequency is adjusted, starting from an initial frequency, so as to tend to maintain the output voltage at or close to the target voltage. Prior to the fine adjustment operation, a sweep operation is carried out to set the initial frequency. The pulse-signal frequency is changed step by step from a first frequency to a second frequency at which the output voltage crosses the target voltage. A rate of change of the pulse-signal frequency in the sweep operation is greater than that in at least part of the fine adjustment operation to speed up the rise of the output voltage.",
  "title": "Pulse signal generating circuitry, high-voltage power supplying apparatus and image forming apparatus having the same"
}