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--- lab:ninjascc:hardware [2016/03/25 20:23] – chrono
+++ lab:ninjascc:hardware [2016/04/02 09:13] (current) – chrono
@@ Line 1: / Line 1: @@
-====== NinjaSCC Hardware Design Specifications ======
+====== NinjaSCC Hardware ======
 {{:lab:ninjascc:ninjascc.sch.svg|}}
-Desired NinjaSCC Specs to have a common frame of reference during design and
-documentation phase.
-===== Electrical =====
-==== PV Input ====
-^                   Symbol                    ^         Parameter          ^  Min   ^  Typ  ^  Max  ^  Unit   ^
-|  V<html><sub></html>MPP<html></sub></html>  |       PV MPP Voltage       |  11.5  |  18   |  36   |    V    |
-|  V<html><sub></html>OC<html></sub></html>   |  PV Open-Circuit Voltage   |        |       |  45   |    V    |
-|  I<html><sub></html>SC<html></sub></html>   |  PV Short-Circuit Current  |        |       |  15   |    A    |
-|  P<html><sub></html>MPP<html></sub></html>  |        PV MPP Power        |        |       |  250  |    W    |
-|                      -                      |  Panel/Cell Configuration  |   18   |  36   |  72   |  Cells  |
-==== Battery ====
-^                      Symbol                      ^      Parameter      ^  Min  ^  Typ   ^  Max  ^  Unit  ^
-|    V<html><sub></html>Bat<html></sub></html>     |   Charge Voltage    |   5   |  13.4  |  45   |   V    |
-|    I<html><sub></html>Bat<html></sub></html>     |   Charge Current    |       |        |  15   |   A    |
-|  Ripple<html><sub></html>rms<html></sub></html>  |  Output Ripple RMS  |       |   15   |       |   mV   |
-|  Ripple<html><sub></html>p-p<html></sub></html>  |  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<html><sub></html>Load<html></sub></html>  |     Output Voltage     |   5   |       |  45   |   V    |
-|  I<html><sub></html>Load<html></sub></html>  |  Cont. Output Current  |       |       |  15   |   A    |
-==== Efficiency ====
-^                      Symbol                       ^          Parameter          ^  Min  ^  Typ   ^  Max  ^  Unit  ^
-|  BK-MPP<html><sub></html>Eff<html></sub></html>   |  Buck-Mode MPP Efficiency   |       |  98.5  |       |   %    |
-|  BST-MPP<html><sub></html>Eff<html></sub></html>  |  Boost-Mode MPP Efficiency  |       |  98.5  |       |   %    |
-|    TR<html><sub></html>Eff<html></sub></html>     |     Transit Efficiency      |       |  99.5  |       |   %    |
-==== ADC ====
--bit ARef 5V (Arduino)
--bit ARef 5V (4 channel external ADC via I2C)
-===== 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   ^
@@ Line 72: / Line 15: @@
 |  Substrate LQ  |    FR4    |
-===== Protection =====
-==== Electrical ====
-  * Short-Circuit [HW]
-  * Over-Voltage [HW+SW]
-  * Over-Current [HW+SW]
-  * Adjustable Current Limiter [HW+SW]
-  * LVD (Low-Voltage Disconnect of Load) [SW]
-  * UVLO (Under-Voltage Lock-Out) [HW]
-  * Uncontrolled 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 [[https://hackaday.com/tag/ftdigate/|give FTDI the finger]]) 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.
-===== Dedicated USB Charging Port (DCP) =====
-As other USB power sources, like most wall warts and auto adapters,
-NinjSCC does not enumerate the USB output port. Charging can begin
-immediately, without any digital communication/negotiation, as defined
-in the supplementary USB Battery Charging Specification, Rev 1.1,
-/15/2009 (BC1.1).
-  * Supply 5V up to 1.5A
-  * DCP mode identified by a short between D+ to D-
-  * Short-Circuit, Over-Voltage, Over-Current, Over-Temperature protected
-  * Shares EN pin with Load Switch to maintain LVD ability by default,
-but can be selected with a solder bridge/0R
-===== 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 [[https://github.com/influxdata/influxdb|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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