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1、设计制作一个简易的可编程直流稳压电源（A simple programmable DC regulated power supply is designed and made）CatalogThe first part is system design1.1 design topics and requirements. Three1.2 overall design plan. Three1.2.1 design ideas. ThreeDemonstration and comparison of 1.2.2 schemes. FourThe second part is the unit
2、 circuit design2.1 unit circuit and its operation principle or function explanation. TenSelection and calculation of 2.2 unit circuit components. NineteenThe third part is the whole machine circuit3.1 whole machine circuit diagram. Twenty-one3.2 component list. Twenty-twoThe fourth part is the test
3、of performance index4.1 circuit debugging. Twenty-three4.1.1 test instruments and equipment. Twenty-three4.1.2 function index test and measurement data. Twenty-three4.1.3 fault analysis and processing. Twenty-four4.2 circuit implementation functions and system instructions. Twenty-fourThe fifth part
4、 is the summary of curriculum design. Twenty-fiveThe first part is system design1.1 design topics and requirementsDesign topic: design and make a simple programmable DC stabilized voltage power supply.1, basic functions: (1) can realize 5V, 9V, 12V and 15V programmable DC stabilized power supply;(2)
5、 load current: IO=500mA;(3) ripple voltage: VO10mV;(4) single 15V transformer is used as power input.2. Play part: (1) select and maintain any designated voltage, keep the time of 4S, return to the state after being kept.(2) display the current voltage by digital tube, with 0, 1, 2, 3, respectively,
6、 5V, 9V, 12V, 15V.1.2 overall design plan1.2.1 design ideasAccording to the function of the circuit, the whole circuit can be divided into six parts: the clock pulse circuit, the holding circuit, the counting circuit, the logic control circuit, the power output circuit and the display circuit. Each
7、module has one or several major chips or devices.For the clock generation circuit, first of all to design a cycle of 1s clock pulse signal, select NE555 and some resistors and capacitors into a cycle of 1s multivibrator, mainly for the counting circuit to provide part of the clock.Keep the circuit d
8、esign and the design of pulse circuit using similar circuit composed of NE555, but the principle is the 555 circuit design into a monostable circuit, through the switch trigger output 4S transient. Since the transient state is high, an inverter is necessary. The output of the inverter is connected w
9、ith the P terminal of the counting circuit 74LS161 to form a 4S holding circuit. The circuit is mainly used to realize when the selected output voltage is kept, the holding time is 4S, and the circuit is returned to the state after being kept.The counting circuit consists of four bit binary 74LS161
10、chips, and the counting circuit also has the function of holding. The clock input is input by the clock circuit, and the output terminal can control the loop conversion of the 4 voltage outputs only with two bit low.The logic control circuit is mainly used to control the counter in the corresponding
11、 value on the logic gate circuit is used for detecting the four key state, the number of preset and to convey information to the counter, so as to control the analog switch strobe corresponding channel access resistance and corresponding control voltage output.The main power part is mainly composed
12、of LM317 and a resistor connected between the output terminal and adjust the end LM317 generate a constant current, 4 different resistance between the terminal and the public, to control the analog switch on the constant current through the corresponding resistance resistance of different voltage.Th
13、e common triode of the 4 resistors is controlled by a switch, and the triode is controlled by an analog switch, and the analog switch is controlled by a counter to drive the circuit through the circuit.The display circuit is mainly composed of CD4511 and digital tube, and CD4511 is a special decoder dedicated to converting two - decimal code (BCD) into seven segment display. The input can be directly connected with the
