| 摘要 |
PURPOSE: A car audio burglar alarm is provided to generate an alarm when a car audio is separated or when a battery power line is cut, and to make a battery voltage be maintained at a possible start state always. CONSTITUTION: A car audio burglar alarm comprises an ignition key switch part(10) which outputs a key signal indicating an operation position of an ignition key. A battery switch(40) is installed between a battery(30) and a power consumption device(30) of a vehicle, and supplies a battery power to the power consumption device(30). A reset button(50) is operated by a user, and resets the battery switch(40) so as to be switched on. A speaker(60) generates a burglary alarm sound and a charge alarm sound corresponding to a burglary alarm signal and a charge alarm signal, respectively. A light emitting diode(LED) part(70) is operated according to a reset signal of a high level, and informs the driver that a battery(20) is at a possible start state. A micro computer(90) checks a present battery voltage variation value periodically by communicating with a car audio(80), and outputs the burglary alarm signal according to the result. The micro computer(90) outputs the reset signal and the charge alarm signal according to a state of the reset button(50), a result of analyzing a key signal of the ignition key switch part(70), and a result of checking a present battery voltage.
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