Hardware » Helios

h1. Eval

"https://www.seesslen.net/redmine/projects/slonce/wiki/Office":See

Warum alles zusammen?

RTC aktiviert MCU via Batterien. Muss LED-Traffo aktivieren. Können unterschiedliche Traffos fur unterschiedliche Lampen-Typen (kalt/warm) sein.

h2. New Features compared to Mainswitch/CANSwitch

* More current

* Fix Wakeup

** Beim Mainswitch gab der Power-button einen Stromimpuls auf den ACQxxx und auf einen GPIO. Wenn das system von extern gespest wurde und die MCU schlafen war, konnte sie nicht wieder aufgewekt werden.

* Periodic wakeups to make measurements: RTC

** RTC_OUT gibt spannung auf den ENABLE des MAX5200

* Programmed wakeup for plant lights and light-buzzer

* Diode ? Voltage-Drop issue

** Ideal diode with Mosfet

* High voltage (24V)? Transceiver halten 14-16V an CAN-HI/CAN_Low aus.

** Akku: ACCU-BPE1.3-12/BP

** TS78L05CX-RFG (Fuer 12V)

** "Fuer 24V":https://www.reichelt.de/de/de/shop/produkt/spannungsregler_fest_3_3_v_sot-23-115940

** Different connectors

* Global Timeserver; It already has batteries 

* Real touch keys

** Why? In addition to increase illumination. But thats what candis was for.

* Over-Temperature power off (PCB/Box)

* Buzzer?

** indicate peridoc on/off during day time

* External Solid State Relais for high power switching like Horo

* 4 Sectionen: SZ, WZ, MEMS, ?

** Switching sounds valid. But not sure.

** Stoeren ungepowerte Platinen CAN? Sollten sie nicht.

** Erzwingt Sternkonstelation

h2. Components

Ideal Diode:

* VN7140ASTR; up to 0,280 ohm, 0,120 Ohm typical

* LTC4412; 2,9V; TME 2.60EUro; External P-MOSFET needed; Waere perfekt gewesen; load sharing

* TPS2410 N.A.

* LM5050

* MAX40200; 1A only, no external MOSFET

* LM74700; 1.27€; perfekt; load sharing

--LTC4412 is the only available--

Temperature:

TMP1075; TMP1075NDRLR; 0,31€

Muesste noch viel rumliegen haben

Power measurement:

INA228AIDGSR; 3.63EUro

h2. Calculations

* 240V/600mA eigentlich ausreichend; 144W

* AQH3213A 

* STM32F030K6T6 should draw 20µA in stop

* 700mAh=700000µAh

* 700000µAh/20µA=3500h=1458d=ca 4 years

h2. MCU

* "Find":https://www.tme.eu/de/katalog/st-mikrocontroller_112866/?params=375:1453589,1453450,1853043,1634756,1634761,1938598,1473784,1613924;3461:1979124,1979125

* STM32F072C8T6

** 2V, ok, Entladeaschlussspannung

** Nur LQFP48; 4.53Euro

** 1,85 € Reichelt STM32F072CBT6 128KB Flash

** RTC_OUT out PC13

* STM32H503CBT6, "STM32H503KBU6":https://www.tme.eu/Document/e92fcde7cdebb20ebbd5639f57dc7863/stm32h503cb.pdf

** 3.20Euro

* Fuer VBAT wird beim STM32H503KBU6 auch FQFP48 benoetigt.

h2. Regulator boards

h3. Number of LED drivers

Living room has 4 lamps, maybe 6 later.

h3. Electrical design

Optokopler needs 10mA, 1.38V_F.

Powermeter needs common ground anyways to measure voltage.

"All TME":https://www.tme.eu/de/katalog/smd-operationsverstarker_112843/?params=2613:1508643_integrierten-schaltkreises-art:spannungs-und-stromuberwachung&onlyInStock=1

h3. Regulators

LDB350 hat 9 ~ 36VDC EIngang und 2-40V Ausgang.

h2. Issues

h3. Wie Straenge schalten

* 4 x LTC4412 umstaendlich, E.g. status ruecklesen

* Jeweils 2 Mosfets notwendig um zu isolieren, klein + gross

* Wozu Stränge? 2 direkt verbundene Buchsen reichen nicht? Auch nur um sich allenfalls Verteiler zu sparen.

h3. USB interface?

* Usable with Raspberry or so.

* Should at least work along with CAN

h3. Light optional

* Media does not need light. The name is "helios". Use CANSwitch then.

* But having the regulators in batteries is nice. They work even without MCU board.

* 4xPWM

* 2xTerminals; IN+OUT

* Switch can be done on helios, only for first block

** If the switch is also on the blocks, Single power supply can be used

** Do i really have multiple power supplys for different LEDs? Could be, an active one for High power and an small one for nice ambience. 

** Smaller power supply for bus only?

* Must not connect Grounds of different power supplys

Das mit IDC oder aehnlichem zu machen klingt nice. Dann gehen theoretisch 4x4 (4xNetzteile schalten), man braucht 'nur' 4xPWM, Kaskadierung.

Alternativ 'addresse' einstellbar. Dann ist man noch flexibler, e.g.

8 x kalt, 8 x warm.

8 x Zimmer, 4 x Tisch.

"B2B-Steckverbinder":https://www.tme.eu/de/katalog/platine-zu-platine-steckverbinder_100569

Kabel: 4xPWM, 4xSwitch VDD, GND -> 10P

DIP-Switches: DS04254204BKSMT

Steck-Verbinder: FTSH10501FDV007KP; ZL231-10PG (THT) (SMD expensive)

Kabel: DS1052-102B2NA2015

h2. Netzteile

Beleuchtung: 

GLP GPV-60-36 (Reichelt 16,95Euro)

60 W, 36 V DC, 1,67 A; der koennte eh "nur" 4,771428571 COBs betreiben.

For Bus:

GLP GPV-20-12

LPC2412CV

h2. Go 12V

Device should be prepared to provide 12V-Bus.

Voltage regulator needs v_in > 15V for this.

https://cdn-reichelt.de/documents/datenblatt/A200/LM2576T_ADJG.pdf

LM2576 can do this. 3A. Jumper for voltage possible. 1,15Euro; LM2576R-ADJ-TT

Fuer die 3V3: LDI8119-3.3EN-DIO; Eingang 1,8...18V

h2. 5V

5V braucht es ohnehin fuer SSR zum schalten und fuer die USB-charger-bar.

At least high power SSRs need 5V as gate voltage. A level shifter is needed.

74LVC4245A; 50mA should be enough; High power SSR needs cam 16mA. LDB-350 needs 1mA, 2V-10V

"List at TME":https://www.tme.eu/de/katalog/spannungsregler-dc-dc-schaltungen_100220/?params=365:1443462,1455068,2077593,1450000,1443628,1502191,1443463,1455073,2077617,1443635,1498627,1443636,1444026,1443531,2077498,1455077,1444027,1481928,1443532,1450037,1444029,1443641,1493298,1492896,1492968,1450041,1450265,1455114,1498182,1455113,1499757,1521916,1502257&onlyInStock=1&productListOrderDir=ASC&productListOrderBy=1000014

VOUT = VREF ( 1 + R2/R1 )

R2 = R1 (VOUT/VREF -1)

where VREF = 1.23V, R1 between 1.0k and 5.0k

R2=12k

R1=3,9K

1,23 × (1 + (12000 / 3900)) ≈ 5,014615385V

h2. 12V

TI itself recommends

LMR51430, LM76003, TLVM13630; higher switching speeds for smaller coils.

A4403GEUTR-T; klein, < 1 Euro

L7987; etwas komplizierter; < 2 Euro; Schafft VOUT=VIN, also 12V Netzteile fuer VBUS=12V moeglich. 

3A; 1.5MHz; PGOOD koennte MOSFET schalten, also Bus spannungsfrei bei Unter-/Ueberspannung. Bei max. 61V geht auch 48V Netzteil.

AOZ1284PI; simpler; <70Cent; 2Mhz; 4A; funktioniert nicht mit 12V Netzteilen bzw. 5V USB Netzteilen. Manche Devices koennen theoretisch 12V und 5V.

IHLP2525CZER100M01 Induktion, 2 in Serie

DE1207-27

DE1207-10

"List at TME":https://www.tme.eu/de/katalog/spannungsregler-dc-dc-schaltungen_100220/?params=624:2077615,1502014,1502029,1895352,2077463,1895323,1895173,1544465;144:1906047,1752668,2077462,1752496,1440773;365:1443628,1443463,2077617,1443635,1443531&onlyInStock=1

When having 5V+12V, USB charging bar can be reactivated.

Der 12V teil sollte komplett optional sein.

h2. 5V I2C

System is a little bit inconsistent.

5V PWM signals but 3V I2C. Add level shifter.

PCA9306DCTR

h2. Issues

VDD transition

On start the battery is feeding vdd via perfect diode.

The MCU starts. The RTC must not be reconfigured till other pin is taking care the battery will keep feeding VDD.

A pin from VDD is switching the SSR.

Power supply feeds 2xL7987, one producing 5V. An LDI8119xxEN then veeds VDD again.

The SSR must be powerable by 2V and by 3,3V.

IF=5mA; VF=1.2; R=1,2/0,005=240Ohm;  

Rvor = ( V - Vf ) / If; (1,8-1,2)/0,005=120 Ohm-> *120Ohm*

3,3/120+240=9mA

(3,0-1,2)/0,005=360Ohm -> *330Ohm*

3,3/330+240=0,005789mA

Does INA228 work to measure single LED on 3,3V? Smallest current which can be meassured?

h2. Current measuring

* One INA228 per driver board

* INA228 for 5V, 12V, 3,3V, VBus