Title:
車両盗難警報音駆動回路
Document Type and Number:
Japanese Patent JP5432817
Kind Code:
B2
Abstract:
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.
Inventors:
Yutaka Abe
Application Number:
JP2010116672A
Publication Date:
March 05, 2014
Filing Date:
May 20, 2010
Export Citation:
Assignee:
Panasonic Corporation
International Classes:
G10K9/12; B60Q5/00; B60R25/10; B60R25/104; B60R25/40; G08B13/00; G08B15/00; G10K9/122
Domestic Patent References:
| JP2004130942A | ||||
| JP2007011244A |
Attorney, Agent or Firm:
Keisei Nishikawa