2 layers44.2 × 29.3 mm
2 layers27.9 × 33 mm
SolarPowerInterrupter
Marcus10110/SolarPowerInterrupterQuick and dirty PCB that will turn OFF a relay when USB power is appled.
- Size
- 27.9 × 33 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 21
- Nets
- 19
- Pads
- 63
- Tracks, vias
- 111, 14
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 9 Aug 2022
- Updated
- 14 Aug 2022
Overview
SolarPowerInterrupter is an open-source printed circuit board by Marcus10110, from the Marcus10110/SolarPowerInterrupter repository on GitHub. It is a 2-layer board of 27.9 × 33 mm with 21 parts on 19 nets, routed with 111 tracks and 14 vias.
It is built around the BSS138 and BSS84. Its parts include 8 resistors, 3 diodes, 3 transistors, 2 connectors and 2 fuses. It belongs with the power boards of this library.
Main components
2README
Readme.mdSolar Power Interrupter PCB
Purpose
We will be charging the camp battery from both solar and generators. However, we do not want to attempt to charge the battery from two source at once, since they are unable to cooperate. To avoid this situation, the solar charger should automatically be disengaged when the generator is turned on. The solar charger connection instructions says to connect the battery before the solar panels. Therefore to turn off the solar charger, we should disconnect the panels from the solar charger.
This connection is approximately a maximum of 100V and 12A, DC.
The generator is detected by the presence of 5V from a USB charger connected to the generator.
When the 5V is not present, the relay should be conducting. The current required to turn on the relay will be provided by the battery.
The solar power interrupter will effectively logically invert the input from the USB charger, and switch on/off the relay using the battery voltage and a high side switch.
Parts:
- P-channel MOSFET: BSS84
- N-channel MOSFET: BSS138
Features:
- Input RC filter in case the USB-C input flickers on and off while the generator starts or stops.
- Polyfuse on USB input
- Polyfuse on battery input
Review Points:
- Check Vgs and Vds absolute maximums, must survive max battery voltage (25V)
- Vgs out of range on both!:
- Fix: add voltage dividers. [Done]
- Vgs out of range on both!:
- Check that the pin numbering in the schematic, PCB, and data sheet are consistent.
- Check relay behavior - do I need a current limiting resistor on the input? should one be added anyway for safety?
- Verify USB-C connector CC connections.
- Verify PCB silk screen matches connections.
- Is the battery safe from all failures?
- Is the 5V USB supply safe from all failures?
- All parts have part numbers!
Images
Note, some small changes have been made since these images were captured.
Parts
21| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 5.1K | Resistor_SMD:R_0805_2012Metric | R1, R2 |
| 2 | 56k | Resistor_SMD:R_0805_2012Metric | R4, R8 |
| 2 | BSS138 | Package_TO_SOT_SMD:SOT-23 | Q1, Q2 |
| 2 | D_Zener | Diode_SMD:D_SOD-123 | D1, D2 |
| 2 | MountingHole | MountingHole:MountingHole_4.3mm_M4 | H1, H2 |
| 1 | 10K | Resistor_SMD:R_0805_2012Metric | R3 |
| 1 | 10k | Resistor_SMD:R_0805_2012Metric | R5 |
| 1 | 2.7K | Resistor_SMD:R_0805_2012Metric | R7 |
| 1 | 4.7u | Capacitor_SMD:C_0805_2012Metric | C1 |
| 1 | 6.2K | Resistor_SMD:R_0805_2012Metric | R6 |
| 1 | BSS84 | Package_TO_SOT_SMD:SOT-23 | Q3 |
| 1 | Batt Fuse | Fuse:Fuse_0805_2012Metric_Pad1.15x1.40mm_HandSolder | F2 |
| 1 | D_TVS | Diode_SMD:D_SMB | D3 |
| 1 | Screw_Terminal_01x04 | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-1,5-4_1x04_P5.00mm_Horizontal | J2 |
| 1 | USB Fuse | Fuse:Fuse_0805_2012Metric_Pad1.15x1.40mm_HandSolder | F1 |
| 1 | USB_C_Receptacle_USB2.0 | Connector_USB:USB_C_Receptacle_GCT_USB4085 | J1 |
Questions
How big is the SolarPowerInterrupter PCB?
It measures 27.9 × 33 mm and has 2 copper layers, 1.6 mm thick.
What parts does the SolarPowerInterrupter use?
21 parts, built around the BSS138 and BSS84. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the SolarPowerInterrupter KiCad files?
From the Marcus10110/SolarPowerInterrupter repository on GitHub, at the commit this page was made from: the board is solar power interrupter.kicad_pcb and its schematic solar power interrupter.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the SolarPowerInterrupter design in my own project?
Its repository states no licence, so its author keeps all rights: ask Marcus10110 before reusing the design.
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