| 摘要 |
PURPOSE: A control circuit for a traffic sign post is provided to solve an error that the traffic sign is not emitted at night through detection of luminance of a street lamp projected on the traffic sign. CONSTITUTION: In a control circuit for a traffic sign post, a photoelectromotive force input unit(100) transmits photoelectromotive voltage to a controller and determines the charge state of a battery unit. The photoelectromotive force input unit is connected to the battery unit and outputs the photoelectromotive force. The battery unit includes a battery which is charged by the photoelectromotive force. A regulator(130) controls the output voltage of the battery to be stable. An illuminance sensor(140) outputs a signal to the controller according to ambient illuminance. |
