Simple numerical control DC source
Abstract: To design a simple digital display digital DC power supply, including the digital control part, D / A conversion part and an adjustable voltage part. The are circuit of the digital part is amposed of two cascaded BCD code plus / minus counter CD40192; its preset input D0 ~ D3 dial code annects BCD switch to antitude preset voltage function.The CD4060 is joined to complete the continuous scanning of the automatic voltage, then the digital part comes up with 8HZ pulse frequency and the composition of CD4011 and CD4069-gated.D / A conversion part uses the right to resistance that the price is very low.while three-terminal voltage regulator circuit Module CW7805 is adopted by the adjustable regulator. The Multisim2001 is used to simulate and test the entire circuit , the output voltage value which uses three digital tabe display is step controled by pressing button,and the value can be increased or decreased continuously or directly changes to a set voltage value if the time of pressing button is longer. Test results show that the design to meet the design requirements, with a certain degree of practical value.
Keywords: Digital Control; digital display; regulated power supply;