{
  "$type": "site.standard.document",
  "description": "A vehicle burglar alarm circuit includes a transformer (Tr1) including an input unit having taps (tp1,tp2) and a center tap (tp3), and an output unit magnetically coupled to the input unit; a first and a second power source (1,2) each having one electrode connected to the center tap (tp3) to…",
  "path": "/patents/1007676",
  "publishedAt": "2011-11-23T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60R25/10",
    "PANASONIC ELEC WORKS CO LTD [JP]"
  ],
  "textContent": "A vehicle burglar alarm circuit includes a transformer (Tr1) including an input unit having taps (tp1,tp2) and a center tap (tp3), and an output unit magnetically coupled to the input unit; a first and a second power source (1,2) each having one electrode connected to the center tap (tp3) to respectively output a higher voltage (V1) and a lower voltage (V2); a driving unit (4) including switching elements (Q1,Q2) respectively having one end connected to the taps and another end respectively connected to the other electrodes of the power sources; a PWM controller (3a) outputting signals by which the switching elements (Q1,Q2) are alternately turned on and off; and a power source selecting unit for selecting one of the power sources. The PWM controller (3a) generates a first on-duty ratio when the first power source (1) is selected and a second on-duty ratio when the second power source (2) is selected such that the first on-duty ratio is smaller than the second on-duty ratio.",
  "title": "Vehicle burglar alarm circuit"
}