KNX-Transceiver - Versionsgeschichte

Berrij: Berrij verschob die Seite KNX nach KNX-Transceiver

2025-10-18T18:19:03Z

Berrij verschob die Seite KNX nach KNX-Transceiver

Thoto: /* Results */

2018-09-21T22:18:18Z

‎Results

Thoto am 21. September 2018 um 22:16 Uhr

2018-09-21T22:16:37Z

Thoto am 21. September 2018 um 21:35 Uhr

2018-09-21T21:35:09Z

Thoto: /* MOSFET based transmitter cirucit */

2018-06-25T20:09:04Z

‎MOSFET based transmitter cirucit

Thoto: /* MOSFET based transmitter cirucit */

2018-06-25T20:05:12Z

‎MOSFET based transmitter cirucit

Thoto am 25. Juni 2018 um 20:04 Uhr

2018-06-25T20:04:43Z

Mat: /* Software Requirements */

2018-06-24T18:05:04Z

‎Software Requirements

Thoto am 23. Juni 2018 um 17:58 Uhr

2018-06-23T17:58:10Z

Thoto am 23. Juni 2018 um 17:41 Uhr

2018-06-23T17:41:20Z

@@ Zeile 61: / Zeile 61: @@
 === Results ===
 The simulation contains measurements of the time t_active of a pulse according to DIN EN 50090-5-2 section 5.2 and the according voltage levels on the bus. The plot of the transient simulation below shows the bus voltage (green coloured graph) when
-* 35µs-70µs: the MOSFET circuit generates a "0"-pulse
+* 35µs .. 70µs: the MOSFET circuit generates a "0"-pulse
-* 218us-251µs: the BJT circuit generates a "0"-pulse
+* 218us .. 251µs: the BJT circuit generates a "0"-pulse
-* 416µs-451µs: both generate a pulse at the same time
+* 416µs .. 451µs: both generate a pulse at the same time
 Simultaneously the current through resistor R1 is measured (red graph) which indicates the times the MOSFET is activated. At t=250µs there is an unwanted current due to the high voltage peak of the power compensation pulse on the bus. The long current fall time is visible as well.
 [[File:Knx-mosfet-sim1.png|thumb|center|600px|axis labels to be added soon ... Y axis: current: -1..23mA (lines on right side), voltage: 22..56V (grid, left side); X axis: 0..700us, 50us grid size]]

← Nächstältere Version		Version vom 21. September 2018, 22:16 Uhr
Zeile 58:		Zeile 58:

	If you have any issues building or need instructions right now just write a short mail to [[User:thoto\|thoto]].		If you have any issues building or need instructions right now just write a short mail to [[User:thoto\|thoto]].
		+
		+	=== Results ===
		+	The simulation contains measurements of the time t_active of a pulse according to DIN EN 50090-5-2 section 5.2 and the according voltage levels on the bus. The plot of the transient simulation below shows the bus voltage (green coloured graph) when
		+	* 35µs-70µs: the MOSFET circuit generates a "0"-pulse
		+	* 218us-251µs: the BJT circuit generates a "0"-pulse
		+	* 416µs-451µs: both generate a pulse at the same time
		+
		+	Simultaneously the current through resistor R1 is measured (red graph) which indicates the times the MOSFET is activated. At t=250µs there is an unwanted current due to the high voltage peak of the power compensation pulse on the bus. The long current fall time is visible as well.
		+	[[File:Knx-mosfet-sim1.png\|thumb\|center\|600px\|axis labels to be added soon ... Y axis: current: -1..23mA (lines on right side), voltage: 22..56V (grid, left side); X axis: 0..700us, 50us grid size]]

@@ Zeile 11: / Zeile 11: @@
 |download    = https://devtal.de/knx/knx.git/
 }}
-STUB!
+A KNX bus terminal block can be plugged in on the top of the board by the two contacts on the left side. The pin header on the other side provides a digital interface to be connected to a microcontroller and terminals to utilize the bus powering feature of KNX.
 == MOSFET based transmitter circuit ==
 === Introduction ===

@@ Zeile 14: / Zeile 14: @@
 STUB!
-== MOSFET based transmitter cirucit ==
+== MOSFET based transmitter circuit ==
 === Introduction ===
-The simulation shows the basic characteristics of the MOSFET based transmitter circuit compared to the original BCP52 PNP-BJT based one. We wanted to evaluate this because wanted to play around with MOSFET a bit and lower price and heat dissipation of the transmitter. Therefore the circuit is quite hacked together and also shows some bad behaviour:
+The simulation shows the basic characteristics of the MOSFET based transmitter circuit compared to the original BCP52 PNP-BJT based one. We wanted to evaluate this because we wanted to play around with MOSFETs a bit and lower the price and heat dissipation of the transmitter. Therefore the circuit is quite hacked together and also shows some bad behavior:
 * the circuit drains around 6mA of current to ground when the voltage spikes generated by the inductance reach its peak value -- even if the signal is not generated by the MOSFET itself but by another transmitter
-* there is a short dip in voltage just at the beginning of the pulse
+* there is a short dip in voltage just at the beginning of the pulse. It is inside tolerance declared by the specification.
-* we did not evaluate behaviour of parts due to manufacturing tolerances and over temperature range but expect bad results. (Quick simulations of the circuit at different temperatures show that it does its job quite well from -20°C to 80°C.)
+* we did not evaluate behavior of parts due to manufacturing tolerances and over temperature range but expect bad results. (Quick simulations of the circuit at different temperatures show that it does its job quite well from -20°C to 80°C.)
 * it does not match the requirements in EN 50090-5-2:2004 pp. 40 since t_active is longer than 35us. That is mainly due to the low voltage drop from the gate. This may be fixed in software.

@@ Zeile 21: / Zeile 21: @@
 * there is a short dip in voltage just at the beginning of the pulse
 * we did not evaluate behaviour of parts due to manufacturing tolerances and over temperature range but expect bad results. (Quick simulations of the circuit at different temperatures show that it does its job quite well from -20°C to 80°C.)
-* it does not match the requirements in EN 50090-5-2:2004 pp. 40 since t_active is longer than 35us. That is mainly due to the low voltage drop from the gate.
+* it does not match the requirements in EN 50090-5-2:2004 pp. 40 since t_active is longer than 35us. That is mainly due to the low voltage drop from the gate. This may be fixed in software.
 There are measurements inside the simulation verifying the characteristics against the parameters in the specification.

← Nächstältere Version	Version vom 18. Oktober 2025, 18:19 Uhr
(kein Unterschied)

← Nächstältere Version		Version vom 24. Juni 2018, 18:05 Uhr
Zeile 44:		Zeile 44:
	To run the simulation you should use at least KiCAD 5.0.0rc2 with SPICE simulation enabled and ngspice-28. It may be possible to generate a netlist and use ngspice manually, but this is not tested yet.		To run the simulation you should use at least KiCAD 5.0.0rc2 with SPICE simulation enabled and ngspice-28. It may be possible to generate a netlist and use ngspice manually, but this is not tested yet.

−	Note on Debian support: The SPICE simulation part of KiCAD 5 is explicitly disabled in the official Debian unstable/sid KiCAD packages at the moment (2018-06-14). You need to modify both the ngspice and KiCAD packages and build them yourselves to enable building ''libngspice.so'' and enable the use of libngspice in KiCAD. If these changes should not be included in the official packages in near future, we will release build instructions and maybe a Docker image to simplify installation. In the meantime you could try building it yourself ~~or may try to~~ use the ~~latest AUR packages of~~ ngspice and KiCAD 5 ~~on Archlinux~~. If you have any issues building or need instructions right now just write a short mail to [[User:thoto\|thoto]].	+	Note on Debian support: The SPICE simulation part of KiCAD 5 is explicitly disabled in the official Debian unstable/sid KiCAD packages at the moment (2018-06-14). You need to modify both the ngspice and KiCAD packages and build them yourselves to enable building ''libngspice.so'' and enable the use of libngspice in KiCAD. If these changes should not be included in the official packages in the near future, we will release build instructions and maybe a Docker image to simplify installation. In the meantime you could try building it yourself.
		+
		+	If you are using Arch Linux you can use the official ngspice package, which includes the shared library support and build the AUR kicad-git package for KiCAD 5 as long as it isn't officially released.
		+
		+	If you have any issues building or need instructions right now just write a short mail to [[User:thoto\|thoto]].

← Nächstältere Version		Version vom 23. Juni 2018, 17:58 Uhr
Zeile 23:		Zeile 23:

	=== Description of parts in MOSFET circuit ===		=== Description of parts in MOSFET circuit ===
		+
		+	<!--
		+	* D1 and D2 ensure that the bus and supply voltage are always positive in the circuit.
		+	* R6 and R7 are used for current measurements in simulation.
		+	* D3 establishes a potential of V_bus-3.9V at the gate of M1. Therefore the potential at the FET gate is adjusted to just below U_th and the (very small) initial current into the gate is reduced which improves the switching behaviour. Without D3 there would be a dip in V_bus when M1 is switched on.
		+	* D4 generates a voltage of Vconst - 10V - U_R2 at the gate of the FET. The FET has U_th \in [-2,-4] V, so in average 6.3V voltage drop with respect to Vbus are generated (also notice U_D1 and U_D2!) when triggering M1.
		+	-->

	* D1 und D2 sorgen dafür, dass die Spannung am Bus und die Versorgungspannung immer positiv sind.		* D1 und D2 sorgen dafür, dass die Spannung am Bus und die Versorgungspannung immer positiv sind.