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Prepare for v1.2 

* Remove voltage buffer Opamp after TL431PK because it may oscillate
* Replace TL431PK with TL431LI. Stabilized by very large capacitance (> 10uF)
* Add panic passives to differential amplifier in order to avoid oscillaton. Values as they are now should work.
* Remove external ADC. Tests with version v1.1 show that the precision of the STM's ADC is sufficient, (once all oscillations are damped by modifying the circuit)
* Power whole OpAmp circuit with 3.3 volts in order to eliminate the need for the clamping diode at the ADC pin. This diode showed a high reverse current over temperature, which affected the measurement.
This commit is contained in:
Mario Hüttel 2020-02-05 18:30:34 +01:00
parent ae4c0afbf9
commit fa6782c21d
5 changed files with 5480 additions and 7828 deletions
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1182
frontend.sch
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117
reflow-oven-control-pcb-cache.lib
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@ -61,30 +61,6 @@ X ~ 4 300 0 100 L 50 50 1 1 O
ENDDRAW
ENDDEF
#
# Analog_ADC_MCP3551-EMS
#
DEF Analog_ADC_MCP3551-EMS U 0 40 Y Y 1 F N
F0 "U" -450 300 50 H V L CNN
F1 "Analog_ADC_MCP3551-EMS" 200 300 50 H V L CNN
F2 "" 0 0 50 H I C CIN
F3 "" 0 0 50 H I C CNN
ALIAS MCP3551-EMS
$FPLIST
MSOP*
$ENDFPLIST
DRAW
P 7 0 1 10 -200 250 350 250 350 0 350 -250 -200 -250 -450 0 -200 250 f
X Vref 1 -100 -400 150 U 50 50 1 1 I
X Vin+ 2 -500 100 150 R 50 50 1 1 P
X Vin- 3 -500 -100 150 R 50 50 1 1 P
X Vss 4 100 -400 150 U 50 50 1 1 W
X SCK 5 500 100 150 L 50 50 1 1 I
X SDO/~RDY~ 6 500 0 150 L 50 50 1 1 O
X ~CS~ 7 500 -100 150 L 50 50 1 1 I
X Vdd 8 100 400 150 D 50 50 1 1 W
ENDDRAW
ENDDEF
#
# Connector_Generic_Conn_01x02
#
DEF Connector_Generic_Conn_01x02 J 0 40 Y N 1 F N
@ -495,26 +471,6 @@ X SB 4 400 200 300 L 50 50 1 1 P
ENDDRAW
ENDDEF
#
# Diode_1N4448W
#
DEF Diode_1N4448W D 0 40 N N 1 F N
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F1 "Diode_1N4448W" 0 -100 50 H V C CNN
F2 "Diode_SMD:D_SOD-123" 0 -175 50 H I C CNN
F3 "" 0 0 50 H I C CNN
ALIAS 1N4148W BAV16W 1N4448W MMSD4148
$FPLIST
D*SOD?123*
$ENDFPLIST
DRAW
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P 2 0 1 0 50 0 -50 0 N
P 4 0 1 8 50 50 50 -50 -50 0 50 50 N
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X A 2 150 0 100 L 50 50 1 1 P
ENDDRAW
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#
# Jumper_SolderJumper_2_Open
#
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@ -537,6 +493,33 @@ X B 2 150 0 100 L 50 50 1 1 P
ENDDRAW
ENDDEF
#
# Jumper_SolderJumper_3_Open
#
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F2 "" 0 0 50 H I C CNN
F3 "" 0 0 50 H I C CNN
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$ENDFPLIST
DRAW
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A -40 0 40 901 -901 0 1 0 F -40 40 -40 -40
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A 40 0 40 -899 899 0 1 0 F 40 -40 40 40
S -20 40 20 -40 0 1 0 F
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P 2 0 1 0 100 0 80 0 N
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ENDDRAW
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#
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#
DEF MCU_ST_STM32F4_STM32F407VETx U 0 20 Y Y 1 F N
@ -734,23 +717,23 @@ X IO1 6 -500 100 200 R 50 50 1 1 P
ENDDRAW
ENDDEF
#
# Reference_Voltage_TL431PK
# Reference_Voltage_TL431DBZ
#
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DEF Reference_Voltage_TL431DBZ U 0 20 N N 1 F N
F0 "U" -100 100 50 H V C CNN
F1 "Reference_Voltage_TL431PK" 0 -100 50 H V C CNN
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F1 "Reference_Voltage_TL431DBZ" 0 -100 50 H V C CNN
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SOT*89*
SOT?23*
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DRAW
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P 3 0 1 0 -30 30 30 0 -30 -30 F
P 4 0 1 10 20 -40 30 -30 30 30 30 30 N
X REF 1 0 100 100 D 50 50 1 1 P
X A 2 -100 0 50 R 50 50 1 1 P
X K 3 100 0 50 L 50 50 1 1 P
X K 1 100 0 100 L 50 50 1 1 P
X REF 2 0 100 100 D 50 50 1 1 P
X A 3 -100 0 100 R 50 50 1 1 P
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ENDDEF
#
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ENDDRAW
ENDDEF
#
# power_+3.3VA
#
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F1 "power_+3.3VA" 0 140 50 H V C CNN
F2 "" 0 0 50 H I C CNN
F3 "" 0 0 50 H I C CNN
DRAW
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P 2 0 1 0 0 0 0 100 N
P 2 0 1 0 0 100 30 50 N
X +3.3VA 1 0 0 0 U 50 50 1 1 W N
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ENDDEF
#
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#
DEF power_+3V3 #PWR 0 0 Y Y 1 F P
@ -910,21 +908,6 @@ X +5V 1 0 0 0 U 50 50 1 1 W N
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#
# power_+5VA
#
DEF power_+5VA #PWR 0 0 Y Y 1 F P
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F1 "power_+5VA" 0 140 50 H V C CNN
F2 "" 0 0 50 H I C CNN
F3 "" 0 0 50 H I C CNN
DRAW
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P 2 0 1 0 0 0 0 100 N
P 2 0 1 0 0 100 30 50 N
X +5VA 1 0 0 0 U 50 50 1 1 W N
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#
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#
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11652
reflow-oven-control-pcb.kicad_pcb
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225
reflow-oven-control-pcb.sch
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$Descr A4 11693 8268
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Sheet 3 3
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Title "Reflow Oven Controller"
Date "2019-09-02"
Rev "v1.0"
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