Recall that I first tried DIY CNC power supply in 2011, when I chose STC's MCU, the display digital tube, PCB also played, and PCB board took more than 500, because this is a work experience. Not enough, so after the PCB came back, I found many problems. Many components did not choose well. The CNC power supply was not finally made, but this time I also learned a lot of things to lay the foundation for many aspects of the work. Later, due to work reasons, DIY's plan was temporarily put aside, PCB was eating ash on one side, but the feeling of DIY CNC power supply was like a seed buried in my heart, and the environment adapts to sprout at any time.
Recently, the idea of ​​DIY CNC power supply has sprouted. I really do a system thing once, even if I end up with a flawed thing, I just want to do it once, I will not regret it after I experienced it, or else I will always There is a knot. At this time, I have been working for a few years, and I have seen more things. I have already accumulated a lot of things, so I have done a lot more smoothly. I have to stop and go through the non-stop revision and upgrade. Finally, the CNC power supply is made. After testing, I found it satisfactory.
The characteristics of CNC power supply:
1. Conventional adjustable DC power supply, 0-30V/0-5A adjustable
2. There is a fuel gauge function, such as charging the battery, you can calculate the amount of electricity and power
3. It is possible to set the upper limit of voltage and current, and alarm protection if it exceeds
4. Pulse output can be set to achieve continuous power-on and power-off of the external circuit
5. There is serial communication
The CNC power supply is mainly composed of the following parts:
1. Display panel. 12 button switches, 1 no limit knob switch, 2 4 digit LED displays, 1 128*64 LCD
2, the main control board. The main control IC STM32F103VC (includes two channels of 12bit DA to adjust voltage and current), expands two 16-bit AD conversion chip TM7705 (compatible with AD7705) to check current and voltage, one 485 communication interface, one 232 to USB interface, multiple IO output control output .
3. Power board. 3 relays control transformer winding switching, rectification and filtering, 2 power MOS IRF250 realizes step-down constant current, op amp constitutes voltage and current control loop drive power MOS, and an NTC sense MOS temperature is connected with main control board.
4, transformer, with the ring cattle 220V AC power transformer into 0~7~21~36V dual 20V single 9V several voltage output, 0~7~21~36V is the source of output voltage, dual 20V is the op amp, fan, The working power of the relay, single 9V is the power supply of the main control board.
Why do you like to use ferrite magnets? Because it does not rust, does not oxidize, does not corrode and is absolutely environmentally friendly.
Why don't ferrite magnets rust?
The chemical name of ferrite magnet is iron tetroxide. The main components are: Fe3O4. It is already an oxide of iron, so it is very difficult to be oxidized again. Other magnets (the main component is iron) are made of magnetized metal iron or other elements. Like other iron and steel, they can be oxidized and rusted, and the oxidized part will lose their magnetism.
What are the advantages (advantages) of ferrite magnets
1. Low cost, low price. Raw material cost is cheap.
2. Good temperature stability. It can be used in temperatures of -40 degrees Celsius and +350 degrees Celsius.
3. It is just mentioned that it does not rust.
4. The demagnetization curve is approximately a straight line.
5. Light weight, density is (4.6-5.1) X103kg/M3
6. The anisotropy constant of the magnetic crystal is large.
7. Large coercivity Hc (between AlNiCo alloy material and rare earth cobalt permanent magnet material)
8. High resistivity.
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