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--- lab:ninjascc:hardware [2016/03/17 07:04] – chrono
+++ lab:ninjascc:hardware [2016/04/02 09:13] (current) – chrono
@@ Line 3: / Line 3: @@
 {{:lab:ninjascc:ninjascc.sch.svg|}}
-# Design Specifications
-Desired NinjaSCC Specs to have a common frame of reference during design and
-documentation phase.
-## Electrical
+^   Parameter    ^   Value   ^
+|     Layers     |     2     |
+|   Thickness    |   2 mm    |
+|     Copper     |   70 µm   |
+|   Silkscreen   |   White   |
+|   Soldermask   |   Black   |
+|  Substrate HQ  |  P96/P26  |
+|  Substrate MQ  |   IS410   |
+|  Substrate LQ  |    FR4    |
-### PV Input
-| Symbol           | Parameter                  | Min  | Typ  | Max  | Unit |
-|:----------------:|:--------------------------:|:----:|:----:|:----:|:----:|
-| V<sub>MPP</sub>  | PV MPP Voltage             | 11.5 |  18  | 36   | V    |
-| V<sub>OC</sub>   | PV Open-Circuit Voltage    |      |      | 45   | V    |
-| I<sub>SC</sub>   | PV Short-Circuit Current   |      |      | 15   | A    |
-| P<sub>MPP</sub>  | PV MPP Power               |      |      | 250  | W    |
-| -                | Panel/Cell Configuration   |  18  |  36  | 72   | Cells|
-### Battery
-| Symbol           | Parameter                  | Min  | Typ  | Max  | Unit |
-|:----------------:|:--------------------------:|:----:|:----:|:----:|:----:|
-| V<sub>Bat</sub>  | Charge Voltage             | 5    | 13.4 | 45   | V    |
-| I<sub>Bat</sub>  | Charge Current             |      |      | 15   | A    |
-| Ripple<sub>rms</sub> | Output Ripple RMS  |      |  15  |    | mV  |
-| Ripple<sub>p-p</sub> | Output Ripple P-P  |      |  40  |    | mV  |
-NinjaSCC will by default fall into a 12V system. Any other check, charge,
-equalize and float setpoints can easily be overriden in software to leave
-more headroom for all kinds of use-cases and many battery types like lead-acid,
-gel,agm and lithium battery packs in the 12V to 36V range.
-Output Current/Voltage ripple and RF noise need to be kept at a minimum, to
-increase battery lifetime and allow RF sensitive devices, like remote
-SDRs, to be powered by NinjaSCC as well.
-### Load
-| Symbol           | Parameter                  | Min  | Typ  | Max  | Unit |
-|:----------------:|:--------------------------:|:----:|:----:|:----:|:----:|
-| V<sub>Load</sub> | Output Voltage             | 5    |      | 45   | V    |
-| I<sub>Load</sub> | Cont. Output Current       |      |      | 15   | A    |
-### Efficiency
-| Symbol               | Parameter                | Min  | Typ  | Max  | Unit |
-|:--------------------:|:------------------------:|:----:|:----:|:----:|:----:|
-| BK-MPP<sub>Eff</sub> | Buck-Mode MPP Efficiency |      | 98.5 |      | %    |
-| BST-MPP<sub>Eff</sub>| Boost-Mode MPP Efficiency|      | 98.5 |      | %    |
-| TR<sub>Eff</sub>     | Transit Efficiency       |      | 99.5 |      | %    |
-## Environment
-| Symbol           | Parameter                  | Min  | Typ  | Max  | Unit |
-|:----------------:|:--------------------------:|:----:|:----:|:----:|:----:|
-| Temp             | Operating Temperature      | -40  |  25  |  85  | °C   |
-| OTP              | Overtemperature Protection |      | +85  |      | °C   |
-| OVP              | Overvoltage Protection     |      |      | 45   | V    |
-## PCB
-| Parameter            | Value    |
-|:--------------------:|:--------:|
-| Layers               |  2       |
-| Thickness            |  2 mm    |
-| Copper               |  70 µm   |
-| Silkscreen           |  White   |
-| Soldermask           |  Black   |
-| Substrate HQ         | P96/P26  |
-| Substrate MQ         |  IS410   |
-| Substrate LQ         |   FR4    |
-## Protection
-### Electrical
-  * Short-Current [HW]
-  * Over-Voltage [HW+SW]
-  * Over-Current [HW+SW]
-  * Adjustable Current Limiter [HW+SW]
-  * LVD (Low-Voltage Disconnect) [SW]
-  * Undesired/Fatal Back-Channel DC GND return (High-Side Load Switch) [HW]
-  * Electromagnetic and Lightning induced extraneous Voltage Transients [HW]
-  * Local ESD  [HW]
-### Environmental
-  * Battery Temperature Monitoring (via external 100k thermistor)
-  * PV Panel Temperature Monitoring (optional)
-  * PCB Temperature Monitoring
-  * Over-Temperature controlled Shutdown
-  * Fan-Control
-  * Assembly PU-Coating
-## Modes of Operation
-Based on real-time assessment of the operating conditions, NinjaSCC dynamically
-determines the optimal operating mode in order to track the maximum power point
-of the PV panel, keeping overall conversion efficiency close to 99%.
-  * MPP Tracking Buck-Only (BK)
-  * MPP Tracking Boost-Only (BST)
-  * MPP Tracking Buck-Boost-Interleaved (BB)
-  * Transit (TR)
-## Controller
-Since Arduinos have been around for a while and have a very broad
-spectrum of documentation, HOWTOs and open-source code to learn from, the
-AVR ATMega32U4 8-Bit Microcontroller (with built-in USB support so that
-we can [give FTDI the finger](https://hackaday.com/tag/ftdigate/)) was
-chosen as the main controller in a fully Arduino-Micro compatible
-configuration, while adding a couple of protective features to it.
-This way, NinjaSCC can be used and flashed over USB like any other
-Arduino-Micro board.
-## Monitoring & Metrics
-Constantly monitor and collect all relevant system metrics and operating
-parameters and deliver a high-resolution, real-time metrics stream
-over USB to be live-viewed and/or shipped into a metrics storage engine
-like [influxdb](https://github.com/influxdata/influxdb) to achieve full
-real-time, remote system awareness, gather long-term data to optimize
-the system even further and have a means to analyze/identify sub-optimal
-operating conditions which might lead to failure like: Battery temperatures
-that are consistently above ambient may indicate high ripple, overcharging
-or internal cell shorting.
-## Remote Control
-Any DC/DC regulation parameter can be overriden in software by remote
-controlling NinjaSCC over USB, so playing and experimenting on a live,
-working converter with instant metric feedback will be a great opportunity
-to study its behaviour while changing parameters and operating modes
-manually. And of course a fun and hands-on learning assistance while
-teaching buck/boost technology to others.
-## Resilience
-Designed in a built-to-last approach, almost all components have been
-selected in a range between automotive qualified and up to
-aerospace/military grade quality. A non-profit approach is the key here,
-because this way the focus gets back where it should belong: On the
-product and the component quality it is made of. With attention to detail
-and without undue compromise.
-To further decrease the chance of total system failure, most important
-system blocks and components have been set up n+1 redundant, wherever
-possible and reasonable.
-NinjaSCC must withstand gale force sub-arctic winds at -40°C while still
-providing power to the camera you've put out there for over a year,
-to make a movie about glacier calving or you are in a remote desert at
-+55°C ambient temperature and need power to operate your water pump.
-When you're truely off-grid, this is the device that must not fail
-(or at last reasonably max out the chance that it does), because murphy
-dictates: it usually does so at the worst possible point in time.

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