Like so many of us I have many device that are connected through a wall charger/adapter in the range of 3,3-20v using 0.15-3A current. I intend to combine all of them in a single box unit using one AC voltage source (220-230V@50Hz). I have already brought a high current (25amps) smps power supply which I have used with a multiple step down voltage regulators for a kind of test phase.
Now I would like to extend to safety and usability of that setup. There is a nice idea somewhere on the web, someone has made a pcb that precisely mounts on the screw terminals on the metal enclosed smps power supplies. I would like to extend on that idea, to make a box for the pcb that has a C14 socket double pole switch and a power meter on the ac side. On the DC side I would like to make some type of inexpensive medium current connection (5A) which could be freely obtained. First I tough of using some of these connectors used for RC car batteries, but they are all cable to cable, so it will most likely be some Molex Mini-Fit Jr or similar, pitch 4.2mm is rated at 13A which is enough even if the cable is not properly crimped. Seems to me that the connector is to big, so if anyone has an other idea, it is most welcome. It needs to be that the connector must have the locking clip and some orientation marker, and there should be readily available horizontal pcb connector male connector.
On the DC side I also intend to have a current measurement for each channel (probably 12 channels) and a relay for each channel. All the control signals would go over a i2c capable multiplexer to an arduino (probably some circuit that already has a library made by someone), and all the current sensors should be INA219 (according to datasheet there are 16 i2c channels available).
On each cable to the end device there will be a small box with a step-up (XL60009 based boards) or step-down (LM2596 and MP1854 based boards) board with appropriate voltage selected for that device.
The device should also have a rtc with a battery for time tracking, some memory for local log file, probably 1-2 temperature sensors, but I have not yet thought in that direction, because these elements are easy to add at the end.
Now, the questions:
What ic should I use for ac current measurement? I have taken a look at TI MSP430AFE2x3, ST STPM01, AD ADE7753, Atmel 90E24, but I cannot really see what makes one better then another for my use case. What I need is a device with some kind of digital output, prefer a device which works with arduino with available library (AD/Atmel), and it should not be BGA case ( have successfully hand soldered 0.65mm tsop smd-s, but bga is beyond me).
For the relays there are a few options available, one is a regular relay. The other is a regular relay with a selectable output between NO and NC, so the devices which are almost always on can use the NO output, and the devices which are sometimes on, to use the NC output. The third option is to use the double latching relays, which are expensive and need appropriate driving circuits. My first idea was the latching relay, but then, it is not a battery powered circuit, and the current consumption is not on the first place, the idea is more to minimize the heat sources, and avoid a relay being powered 24/7. What are your toughts?
Any ideas, suggestions, thoughts that have not been mentioned, are also welcome.
Thank you
Now I would like to extend to safety and usability of that setup. There is a nice idea somewhere on the web, someone has made a pcb that precisely mounts on the screw terminals on the metal enclosed smps power supplies. I would like to extend on that idea, to make a box for the pcb that has a C14 socket double pole switch and a power meter on the ac side. On the DC side I would like to make some type of inexpensive medium current connection (5A) which could be freely obtained. First I tough of using some of these connectors used for RC car batteries, but they are all cable to cable, so it will most likely be some Molex Mini-Fit Jr or similar, pitch 4.2mm is rated at 13A which is enough even if the cable is not properly crimped. Seems to me that the connector is to big, so if anyone has an other idea, it is most welcome. It needs to be that the connector must have the locking clip and some orientation marker, and there should be readily available horizontal pcb connector male connector.
On the DC side I also intend to have a current measurement for each channel (probably 12 channels) and a relay for each channel. All the control signals would go over a i2c capable multiplexer to an arduino (probably some circuit that already has a library made by someone), and all the current sensors should be INA219 (according to datasheet there are 16 i2c channels available).
On each cable to the end device there will be a small box with a step-up (XL60009 based boards) or step-down (LM2596 and MP1854 based boards) board with appropriate voltage selected for that device.
The device should also have a rtc with a battery for time tracking, some memory for local log file, probably 1-2 temperature sensors, but I have not yet thought in that direction, because these elements are easy to add at the end.
Now, the questions:
What ic should I use for ac current measurement? I have taken a look at TI MSP430AFE2x3, ST STPM01, AD ADE7753, Atmel 90E24, but I cannot really see what makes one better then another for my use case. What I need is a device with some kind of digital output, prefer a device which works with arduino with available library (AD/Atmel), and it should not be BGA case ( have successfully hand soldered 0.65mm tsop smd-s, but bga is beyond me).
For the relays there are a few options available, one is a regular relay. The other is a regular relay with a selectable output between NO and NC, so the devices which are almost always on can use the NO output, and the devices which are sometimes on, to use the NC output. The third option is to use the double latching relays, which are expensive and need appropriate driving circuits. My first idea was the latching relay, but then, it is not a battery powered circuit, and the current consumption is not on the first place, the idea is more to minimize the heat sources, and avoid a relay being powered 24/7. What are your toughts?
Any ideas, suggestions, thoughts that have not been mentioned, are also welcome.
Thank you