RoboCup: Kicker Board 2013 - Revision history

Cwehmeyer3 at 02:36, 14 June 2018

2018-06-14T02:36:42Z

Rosawa3: /* Parts list */

2017-05-18T02:42:49Z

‎Parts list

Rosawa3 at 02:39, 18 May 2017

2017-05-18T02:39:53Z

Rosawa3 at 02:39, 18 May 2017

2017-05-18T02:39:17Z

Rosawa3 at 02:33, 18 May 2017

2017-05-18T02:33:55Z

Rosawa3: /* Flyback Converter */ removed inaccurate content

2017-03-03T19:32:29Z

‎Flyback Converter: removed inaccurate content

Rosawa3: /* Flyback Converter */ correcting information

2017-03-03T16:42:19Z

‎Flyback Converter: correcting information

Rosawa3: /* Kicker Charger */ removed mention of discharge controller

2017-03-03T16:34:57Z

‎Kicker Charger: removed mention of discharge controller

Rosawa3: /* Transformer Overview */ removed inaccurate information

2017-03-03T16:32:18Z

‎Transformer Overview: removed inaccurate information

Rosawa3: /* Kicker Charger */ correction of information

2017-03-03T16:31:11Z

‎Kicker Charger: correction of information

← Older revision		Revision as of 02:36, 14 June 2018
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−	[[Category:RoboCup]] [[Category~~:Electrical]] [[Category:Year~~: 2013-2014]]	+	[[Category:RoboCup]] [[Category:2013-2014]]

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 == <span style="font-size: large;"><span id="docs-internal-guid-ec51a860-0670-e694-6338-04481fb2f24a"><span style="font-family: Arial; color: rgb(0, 0, 0); vertical-align: baseline; white-space: pre-wrap; background-color: transparent;">Parts list</span></span></span> ==
-<span id="docs-internal-guid-ec51a860-0670-e694-6338-04481fb2f24a"><span style="font-size: 15px; font-family: Arial; color: rgb(0, 0, 0); vertical-align: baseline; white-space: pre-wrap; background-color: transparent;">Disclaimer: Some of the parts are not used in the final kicker board, but are printed on the mini board that is removed to make room for the capacitors. The parts list can be downloaded [http://wiki.robojackets.org/mediawiki/Media%3AKicker%20parts.pdf here].</span></span>
+<span id="docs-internal-guid-ec51a860-0670-e694-6338-04481fb2f24a"><span style="font-size: 15px; font-family: Arial; color: rgb(0, 0, 0); vertical-align: baseline; white-space: pre-wrap; background-color: transparent;">Disclaimer: Some of the parts are not used in the final kicker board, but are printed on the mini board that is removed to make room for the capacitors. [[RC13KickerElectronics|Here]] is a list of major parts.</span></span>
 == <span style="font-size:large;"><span id="docs-internal-guid-ec51a860-0670-e694-6338-04481fb2f24a"><span style="font-family: Arial; color: rgb(0, 0, 0); vertical-align: baseline; white-space: pre-wrap; background-color: transparent;">References</span></span></span> ==

← Older revision		Revision as of 02:39, 18 May 2017
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−	[[Category:RoboCup]] [[Category:Electrical]] [[Category:Year: 2014~~-2015~~]]	+	[[Category:RoboCup]] [[Category:Electrical]] [[Category:Year: 2013-2014]]

← Older revision		Revision as of 02:39, 18 May 2017
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	<li><span id="docs-internal-guid-ec51a860-0670-e694-6338-04481fb2f24a">[http://en.wikipedia.org/wiki/%C4%86uk_converter <span style="color: rgb(17, 85, 204); text-decoration: underline; vertical-align: baseline; white-space: pre-wrap; background-color: transparent;">http://en.wikipedia.org/wiki/%C4%86uk_converter</span>]</span></li>		<li><span id="docs-internal-guid-ec51a860-0670-e694-6338-04481fb2f24a">[http://en.wikipedia.org/wiki/%C4%86uk_converter <span style="color: rgb(17, 85, 204); text-decoration: underline; vertical-align: baseline; white-space: pre-wrap; background-color: transparent;">http://en.wikipedia.org/wiki/%C4%86uk_converter</span>]</span></li>
	</ol>		</ol>
		+
		+
		+	[[Category:RoboCup]] [[Category:Electrical]] [[Category:Year: 2014-2015]]

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 === Flyback Controller ===
-The flyback controller that is on the board is a LT3757 [4]. This chip modulates the duty cycle of the priamry side switch based ont he feedback voltage to regulate the output voltage.
+The flyback controller that is on the board is a LT3757. This chip modulates the duty cycle of the priamry side switch based ont he feedback voltage to regulate the output voltage.
 === LT3757/Converter controller ===
-The converter controller that is on the board is a LT3757 [4]. This chip manages the switching of our Buck-boost converter. When the supply loop has reached full capacity it will lock the supply loop. When the potential is transferred to the capacitors the supply loop is again unlocked. The LT3757 is an integrated circuit that uses inputs to determine precisely when to switch in order maximize power transfer. We can not do this manually or with our FPGA [5] and CPU [6] because of the asymptotic nature of capacitors and inductors. Unfortunately the LT3757 was designed for a resistive load, and while it can handle capacitive loads quite well there may be other chips that do it even better. We are looking at other possibilities and may improve on this component in the future.
+The converter controller that is on the board is a LT3757. This chip manages the switching of our Buck-boost converter. When the supply loop has reached full capacity it will lock the supply loop. When the potential is transferred to the capacitors the supply loop is again unlocked. The LT3757 is an integrated circuit that uses inputs to determine precisely when to switch in order maximize power transfer. We can not do this manually or with our FPGA and CPU because of the asymptotic nature of capacitors and inductors. Unfortunately the LT3757 was designed for a resistive load, and while it can handle capacitive loads quite well there may be other chips that do it even better. We are looking at other possibilities and may improve on this component in the future.
 === Other converter methods ===
-It has been suggested that other converter types may be able to charge the capacitors faster. A boost converter [7] may allow us to create a higher voltage potential. This would allow a faster transfer from the inductor to the capacitor. The other converter that has been looked at is the cuk converter [8]. A cuk converter might be able to allow the capacitors to be charged while other inductors are charging which would increase the rate of power transfer without raising the voltage across the capacitor. The electrical team is looking at these and other possibilities to improve on these systems in the future.
+It has been suggested that other converter types may be able to charge the capacitors faster. A boost converter may allow us to create a higher voltage potential. This would allow a faster transfer from the inductor to the capacitor. The other converter that has been looked at is the cuk converter. A cuk converter might be able to allow the capacitors to be charged while other inductors are charging which would increase the rate of power transfer without raising the voltage across the capacitor. The electrical team is looking at these and other possibilities to improve on these systems in the future.
 == Voltage Monitor ==

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 This is the kicker board's charging circutry. This allows the board to charge large capacitors up to a very high voltage. This part of the board consists of two main components: the bank capacitors and the flyback regulator. The bank capacitor is charged up to a high voltage and allows a high peak power delivery. The flyback controller is used to convert a low voltage, high current input to a high voltage, low current output.
-=== Flyback Converter ===
+=== Flyback Controller ===
-First, the supply voltage charges the primary side of the flyback transformer to some potential energy. The primary side circuit is then opened. This causes the magnetic field to collapse. Since the primary side is opened, this collapse induces a current in the secondary winding. This induced current charges the bank capacitors. The diode rectifies the current such that the bank capacitors will not backdrive the system. This process is repeated until the feedback voltage from the capacitors reaches the target value.
+The flyback controller that is on the board is a LT3757 [4]. This chip modulates the duty cycle of the priamry side switch based ont he feedback voltage to regulate the output voltage.
 === LT3757/Converter controller ===

@@ Line 14: / Line 14: @@
 === Flyback Converter ===
-The board currently uses a flyback [3] or buck-boost converter along with a transformer to create a very high voltage which we can store in the capacitors. A boost converter allows the output voltage to increase above what can be supplied as input. A very high voltage potential must be reached as soon as possible. This is done through a process of transferring potential energy.
+The board currently uses a flyback [3] converter to create a very high voltage which we can store in the capacitors. The flyback converter allows the output voltage to increase above what can be supplied by the input. This is done through a process of transferring potential energy.
-First the supply voltage charges the transformer to some potential energy specified by the LT3757. The load loop is effectively locked in place by the potential of our capacitive load and a diode which prevents current from being discharged over the capacitors. The supply loop is then locked with a transistor by the LT3757. This forces all of the potential gathered in the transistor into the load loop. Not all of potential energy is transferred because there is already potential energy on the capacitors from the last round of charging. Once enough energy has been transferred to the capacitors the LT3757 will open up the supply loop. This restarts our process recharging the supply loop.
+First, the supply voltage charges the primary side of the flyback transformer to some potential energy. The primary side circuit is then opened. This causes the magnetic field to collapse. Since the primary side is opened, this collapse induces a current in the secondary winding. This induced current charges the bank capacitors. The diode rectifies the current such that the bank capacitors will not backdrive the system. This process is repeated until the feedback voltage from the capacitors reaches the target value.
 === LT3757/Converter controller ===

@@ Line 11: / Line 11: @@
 [[File:Kicker charger.PNG|thumb|center|1200px]]
-This is the kicker board's charging circutry. This allows the board to charge large capacitors up to a very high voltage. This part of the board consists of three main components: bank capacitors, flyback regulator, and the discharge control. The bank capacitor is charged up to a high voltage and allows a high peak power delivery. The flyback controller is used to convert a low voltage, high current input to a high voltage, low current output. The final component is the discharge control to release the enrgy stored in the capacitors to the solenoid.
+This is the kicker board's charging circutry. This allows the board to charge large capacitors up to a very high voltage. This part of the board consists of two main components: the bank capacitors and the flyback regulator. The bank capacitor is charged up to a high voltage and allows a high peak power delivery. The flyback controller is used to convert a low voltage, high current input to a high voltage, low current output.
 === Flyback Converter ===

← Older revision		Revision as of 16:32, 3 March 2017
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	This is the kicker board's charging circutry. This allows the board to charge large capacitors up to a very high voltage. This part of the board consists of three main components: bank capacitors, flyback regulator, and the discharge control. The bank capacitor is charged up to a high voltage and allows a high peak power delivery. The flyback controller is used to convert a low voltage, high current input to a high voltage, low current output. The final component is the discharge control to release the enrgy stored in the capacitors to the solenoid.		This is the kicker board's charging circutry. This allows the board to charge large capacitors up to a very high voltage. This part of the board consists of three main components: bank capacitors, flyback regulator, and the discharge control. The bank capacitor is charged up to a high voltage and allows a high peak power delivery. The flyback controller is used to convert a low voltage, high current input to a high voltage, low current output. The final component is the discharge control to release the enrgy stored in the capacitors to the solenoid.
−
−	~~=== Transformer Overview ===~~
−
−	In the charger design of our kicker board a transformer [1] is used to increase the voltage potential of capacitors. For the design of this board we can think of a transformer as two inductors  with a shared potential energy. This means that we can transfer energy from one inductor to the other freely. These inductors [2] do not have to be identical. In fact it is the difference in inductance that allows the transistor to magnify voltage. For the charger of the transformer, we use the relationship that E = 1/2LI^2, where L is the inductance and I is the current. This allows us to change the current by having a difference in inductance acording to an inverse square root relationship. We can use this current multiplication to create a voltage multiplication effect. This is an ideal transformer, so in reality not all of the energy is transferred.

	=== Flyback Converter ===		=== Flyback Converter ===