A digital program-controlled constant current source
A program-controlled constant current source, digital technology, applied in control/regulating systems, regulating electrical variables, instruments, etc., can solve problems such as easily damaged loads and circuits, failure to take protective measures in time, and burnout of power tubes.
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Embodiment 1
[0039] Embodiment 1 Overall structure of the system
[0040] Such as figure 1 and Figure 12 As shown, the system structure includes MCU module 1, display module 2, indicator module 3, button module 4, encoder module 5, PC program control module 6, soft start module 7, digital-to-analog conversion module 8, output module 9, sampling monitoring Module 10 and front panel 11.
Embodiment 2
[0041] Embodiment 2 Single-chip microcomputer module
[0042] Such as figure 2 As shown, the structure of the single-chip microcomputer module 1 is that the power supply terminal and the ground terminal of the single-chip microcomputer U1 are connected to +5V power supply and digital ground respectively, the power supply terminal is also connected to the digital ground through the capacitor C1, and the crystal oscillator Y1 is connected between the port X1 and the port X2. Port X1 and port X2 are also connected to digital ground through capacitor C2 and capacitor C3 respectively, and ports P00 to port P07 are respectively connected to +5V power supply through resistors R1 to R8. ), P1 mouth (P10~P17), P2 mouth (P20~P27) are common input / output ports, use P0 mouth in the present invention as the data exchange mouth of single-chip microcomputer and A / D, D / A and display chip, P2 Each pin of the port and P3 port is used as the control terminal to realize the coordinated work of ...
Embodiment 3
[0043] Embodiment 3 Display module
[0044] Such as image 3As shown, the structure of the display module 2 is that the ports D0-D7 of the display screen U2 are respectively connected to the ports P00-P07 of the single-chip microcomputer U1, and the ports EN, port R / W and port RS of the display screen U2 are connected to the single-chip microcomputer respectively. Port P10, port WR and port RD of U1, port VL and port BL- of display screen U2 are connected to digital ground, port BL+ is connected to the sliding wire end of sliding rheostat P1, port VDD and port VSS are respectively connected to +5V power supply and digital ground, A capacitor C4 is also connected between the port VDD and the port VSS, one end of the sliding rheostat P1 is connected to a +5V power supply, and the other end is connected to a digital ground. The model of the display screen U2 is LCD1602, which is a 16*2 integrated liquid crystal display with 14 pins in total. The port VDD and the port VSS are the...
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