| 摘要 |
An apparatus for stabilizing a peak voltage of a car is provided to allow a driver to recognize that a battery voltage is less than a reference voltage by generating a warning signal. A ripple voltage removing condenser(10) is connected to a positive pole(4) of a battery and removes a ripple voltage with a high peak value from a discharge voltage of the battery. A filter condenser(11) is connected to the ripple voltage removing condenser in parallel and removes a high frequency generated from the discharge voltage of the battery. A charging and discharging condenser(12) is connected to the ripple voltage removing condenser in parallel, charged by the discharge voltage of the battery, and discharged according to a control signal of a CPU(Central Processing Unit)(40). A constant voltage circuit unit(20) stabilizes the discharge voltage of the battery. An LED(Light Emitting Diode) display unit(30) is connected to R, G, and B LEDs(31,32,33) in parallel and turned on according to the control signal of the CPU to display an operation state of a circuit. The CPU senses voltage of the battery and controls an FET(Field Effect Transistor) and a voltage control transistor to discharge instantaneous voltage required for a car. A voltage dividing unit(41) divides the voltage of the battery by a predetermined ratio so that the CPU stably recognizes the voltage of the battery. A noise removing condenser(42) removes noise of the voltage transmitted to the CPU. A stabilizing diode(43) and a protection fuse(44) prevent damage to the CPU due to a counter electromotive force. A discharge control FET(50) receives the control signal of the CPU and controls the discharge amount of the voltage stored in the charging and discharging condenser with a PWM(Pulse Width Modulation) method according to a switching signal of a discharge control transistor.
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