Changes for page ACCU MB

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  • powestage.png
  • under_construction.png

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22	22
23	23	=== Powersupply ===
24	24
25		-The powersupply is the standard powersupply for Align Racing PCB's, for details see [[this>>https://www.youtube.com/watch?v=QDia3e12czc]] Wiki page.
	25	+{{info}}
	26	+This PCB uses the Align Racing default powersupply, for details see [[this>>https://www.youtube.com/watch?v=QDia3e12czc]] Wiki page.
	27	+{{/info}}
26	26
27	27	=== Powerstages ===
28	28
	31	+All the powerstages are a high-side P-channel MOSFET switch with a N-channel MOSFET gate drive.
29	29
	33	+* N-channel: DMN65D8L-7
	34	+* P-channel: DMP3125L-13
	35	+
	36	+There are five powerstage for
	37	+
	38	+* AIR+
	39	+* AIR-
	40	+* Precharge
	41	+* AMS error
	42	+* IMD error
	43	+
	44	+Powerstage layout:
	45	+
	46	+[[image:powestage.png||height="273" width="240"]]
	47	+
30	30	=== Error latch ===
31	31
	50	+The BMS and IMD both produce a +5V digital signal to indicate "OK" state. Each signal has its own lach logic and powerstage. If the error signal is pulled to 0V the error is latched, which disables the relevant powerstage. In order to clear the error the error signal needs to go back to +5V and a error reset button has to be pressed. On startup, a RC circuit combined with a smith trigger sends a reset pulse, this is done to prevent the need for pressing the reset button each time the LV system is enabled. A demonstration of the error latch logic can be found [[here>>https://www.falstad.com/circuit/circuitjs.html?ctz=CQAgjCAMB0l5BOJyWoeGAmOmDsuBmSADkwDYlcQBWSGkAFgJoFMBaMMAKACVwxM-QcTqdBdOgzrUosmNS7YqBAmXAJBRBusHaA9gGsuAZyFmwZUQLkgAZgEMANsZaLIVC1cFgNZ-UYBzcEsQAmJtT0Y4OS4AY2C6FTVIsO0I9mJGaGR8YmoyCgJMKTAZGDgIGG4AJwTQ1RAENSTZMHhIN2UGlMgIkO0AemrjABdOupafTQbB4bG+JpBMYkzFzHybKXoJKGgFWsWWtZXW+C4gtgZM1UzL6-CY0zvQslur0OxWkBHqgFdXACEUQY2joAGUADR8ACKEIG0OBETAAB1jABBABCyIAjpjkQA7NqogD8xJxkBR+IpJLJ2KJVMgNPJlLc126-QsdUkvW0ZS4ACNGIxiiAOL0lgQqB1BZhZYwCDJrJgCOgOgAPUXEKjrZhsTJ4CARQTVFguEaogz4+wAB2tqOtAFPkQTjAB3ACWI1iAAt7fZ8SxHFwNQJtRtsBB1ugjSBrb9HI5fnbjHoAqjbO7HCMWNVgy9vJKosktjGAMIAESkIIFS2VSzajBkZHEebIzBE4AY6GIzBjGIAsmCBgBJfvl1HGd0BK1B2qRMR1SKidrnRchee4NQSLi2RgdlrUawtIrgPa7SCYVeHzTUQTXl6ZbdKRrNBpkbQtWajAD67vxcbGZ9niKOhnmWTIvxGX9-1+QD3BoI9PnvcChSGH8-wArhamPB5jwaZcVyCHCPxmaJtz4FoUMojYdi2Mo5D2LgwFIUJcJmE8WgkM8wGgApQmgFRtiw+VpjUK5EnwjA4DiepXzkpYTlBWB4AgNgCGyBBN0wBBVAQXoVBWLdlMqLgABNQnFY9xRQwRTJYBx4zGV0LJI+TOK4ZytAUtk1BQjpPIaYjZKgGtqFveUZHIQRlVVPNJSoKQ7wYQ1PhjPQAzYYxvT0c1jBNM1nXxAAKfKWBGbNqlRRx7C9b0WHxVFfnxOzKuMUZ7GqEYkwASh3GhljqahNwmbwz3KS9aiG4teWGxYCOkybZrUKa91OM5d3fOhFk21bktPMpYEvZyVveZs0kfDyaCWkAdrmq9hrAYaVqmGJJoGyJxK5KT-JujZTsUi7juG95qBBVaOj4UHzoQ3RH1kLYRR2eQmObG6AbR1ZfJAOyHKzNhHBYczKgYilhNeTGMc7UFvtXcmqcppcQsFXBOUwUpG0yHwQucz6PpPJc8wYPjfHyLaZBjMFy1Le09FdHMJxGewAlcIA]].
32	32
33	33	=== SDC ===
34	34
	54	+There are several parts of the SDC passing through the motherboard
35	35
	56	+* DCDC 24V and ground >LVMS
	57	+* BSPD(HV Box)->HV Interlock
	58	+* HV interlock->AMS and IMD errors
	59	+* AMS and IMD errors->Emergency stop right
	60	+* TSMS->SDC end
	61	+
	62	+The end of the SDC powers is the power input to the powerstages of the AIR and precharge relays. A capacitor is used to energize the coils for a short time after the SDC is broken. This is done prevent the contacts from breaking wile conducting significant current as this reduces the lifespan of the AIR relays. The capacitor charge and discharge circuit looks like this.
	63	+
	64	+[[image:image.png||alt="Im sorry, but it seems Vetle has eaten the image that was supposed to go here, please bother him into making a replacement." height="257" width="352"]]
	65	+
36	36	=== AIR Relays ===
37	37
	68	+There are two air relays, one for the + side of the ACCU and one for the - side of the ACCU. They are energized by a powerstage activated by the BMS.
38	38
39		-=== Precharge Relays ===
	70	+They are type: <TBA>
40	40
	72	+=== Precharge Relay and logic ===
41	41
	74	+The precharge relay and logic is used to charge the car size of the hight voltage system throught a PTC resistor to 95% of the actual TS ACCU voltage before closing the second AIR relay. (Requiered by EV 5.7) This eliminates the inrush current that would otherwise occur due to charging the capacitors in the inverters.
	75	+
	76	+{{mathjax}}
	77	+$$I(t)=\frac{E}{R}\cdot e^{-\frac{r}{RC}}$$
	78	+{{/mathjax}}
	79	+
	80	+(% class="wikigeneratedid" %)
	81	+The charging current of a capacitor with respect to time is shown above. Without the precharge PTC the resitance is very low, making the inrish current very large. By charging the capacitors through the PTC, the inrush current is reduced to acceptable levels.
	82	+
	83	+(% class="wikigeneratedid" %)
	84	+The precharge relay can only dissipate 100W of power, therefor the precharge relay only provides galvanic isolation (required by EV 5.6.2). A MOSFET switches the charging current after the precharge relay coil has been energized and before the precharge relay coil is de-energized. This prevents the precharge relay from switching large currents thus prolonging the life of its contacts. The logic that switches the gate of the MOSFET works by <STIAN PLS HELP!>
	85	+
	86	+(% class="wikigeneratedid" %)
	87	+The precarge sequence is as follows:
	88	+
	89	+1. AIR+ Closes
	90	+1. The precharge relay closes
	91	+1. The precharge MOSFET switches the precharge power
	92	+1. AIR- Closes after the car side voltage is > 95% of ACCU side voltage
	93	+
42	42	== Pinout ==
	95	+
	96	+[[image:under_construction.png||height="366" width="300"]]

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