| 摘要 |
An output voltage varying apparatus is provided to control a bit size of the digital input data as a user requests by using a digital to analog converter converting the digital input data into analog data and a microprocessor outputting the digital input data. A microprocessor(10) outputs digital input data by a program. A digital to analog converter(20) receives digital input data and converts the received digital input data into analog data. A first comparison unit outputs an activated comparison signal if the analog data is larger than the output voltage and outputs inactivated comparison signal if the analog data is smaller than the output voltage by comparing the analog data with the output voltage. A pulse generator(30) outputs a pulse signal with a predetermined frequency. A control signal generator receive the comparison and the pulse signal and outputs inactivated control signal if the comparison signal is inactivated, and outputs the pulse signal to a control signal if the comparison signal is activated. A switching unit is off if the control signal is inactivated, and is on if the control signal is activated. One terminal of a capacitor is connected to an output voltage and other terminal of the capacitor is connected to the ground voltage. |
