Gregski wrote: ↑Sun Jan 21, 2024 4:29 pmno idea what this man is saying, but thought perhaps our Slavic/Korean viewers would appreciate it:
0:00
Hello friends from the YouTube channel, I am Ángel Unda. Here is a video of the hybrid system from hybrid vehicles.
0:10
In this case we are going to talk about the inverter-converter. Here we have a couple of Toyota inverter-converters.
0:16
As you see here, this would be the part that we have on the table.
0:21
We are going to describe its parts and functioning. It’s going to be brief, obviously, this is complex.
0:29
This is the power electronics that allows the hybrid and electric vehicles to run.
0:35
This inverter-converter is the one receiving, through this connection over here, the voltage of the high voltage battery,
0:44
positive and negative poles,
0:46
and here they are connected in 3 phase, the 3 cables of the motor-generators, MG1 and MG2.
0:55
You have seen this part, the high voltage battery system, in another video of our channel.
1:01
If battery voltage is applied here, the inverter-converter will make different functions.
1:08
One of the functions is converting, which consists of modifying the voltage values.
1:14
On the one hand, it has the booster function, which is amplifying the battery voltage.
1:19
Recall that the battery has 200V (actually 201.6V, but we talk about 200V to make it easier).
1:27
Those 200V are elevated to around 700-750V with the booster function. To do so, several part inside here are needed.
1:36
This would be one of the converting functions.
1:39
On the other hand, we have the lower or buck converting, which is the reduction of the voltage,
1:45
to go from 200V to this little screw that you can see here, which is the 14V connection, this is, from 200V to 14.4V.
1:56
The voltage regulating function that would be done by any alternator is here made by the lower or buck component,
2:06
which is on the bottom part of the inverter-converter.
2:11
So we have those 2 functions as converter: elevate (booster function) and reduce (lower or buck function).
2:17
The booster function is for feeding the motor-generators with higher voltage
2:25
and the lower function is for feeding the battery of the 14V by means of the connection to the fuse box.
2:34
Note that if we have a 200V battery, we can always go to 14V with the right component.
2:40
Besides, we have the inverting function, which is in charge of converting the direct current (DC) to alternate current (AC) for the motor-generator;
2:49
and from AC, generated by the motors, to DC, this is, it allows to make motor function, motor-generator MG, and generation function.
3:00
So the inverter is the brain of this system, it’s very interesting.
3:07
Here we have another inverter, which we opened (a special tool is needed) just to show you how it’s inside, how complex it seems to be.
3:21
The battery voltage would be connected here. Here we have an output towards the compressor of the air conditioning system.
3:28
These would be the 3 phase connections for the motor-generators, and down here we have the connection for the 14V.
3:36
Remember that we need to make the booster function, and to do so we need a reactive coil, which is on the bottom part of the inverter,
3:45
and some power capacitors that you can see here on the cover. For the lower function, it’s all below the inverter, on the metallic pan.
3:55
And for the inverting fuction we have a set of IGBTs with diodes, which are down here.
4:03
Here is the parts that are refrigerated by water, because they generate much heat.
4:10
Here we can see the current clamps to know the phases intensities.
4:14
We can also see the connection of the inverter control unit.
4:21
And some connections for filter type capacitors.
4:25
So this inverter is the most interesting part of the hybrid and electric vehicles,
4:32
because it’s the key for this vehicle to run and especially to make the regeneration or the regenerative breaking,
4:42
this is, when the motor-generators generate current, the inverter is the one rectifying it and sending it at the corresponding voltage to charge the high voltage battery.
4:55
As you can see inside here are the capacitors set.
5:02
This goes this way, as a cover.
5:05
If anyone wants more information, in our on-site Toyota hybrid courses we disassemble all in detail, we explain all the functioning of the components, etc.
5:17
(not only the inverter but also the battery and transaxle).
5:22
This little cover over here is the one to be removed to access the connections.
5:28
Here you can see, for example, that the connection for the compressor comes this way, is has a protection fuse.
5:37
This would be the protection fuse for the compressor.
5:41
When removing this cover, we can find here 2 pins for a micro, see here the connections, for a pilot circuit,
5:52
which informs the unit if someone has opened the cover and, therefore, disconnects the high voltage system.
6:01
In our courses we also explain how to safely handle this vehicles, very important, because we already know that the battery is a 200V high voltage system.
6:13
We need to know how to handle it and know the safety measures to prevent an accident. But inside here we also have high voltage that is accumulated in the capacitors.
6:23
So once we disconnect the battery we also have to make sure the capacitors are discharged.
6:28
That was a quick description of the inverter. As you can see, there are many parts inside.
6:39
We explain each of those parts in our Toyota expert courses. Visit our website to check the next date of these courses.
6:52
This inverter, from my point of view, is the most interesting part of the hybrid vehicles and also the most complex to understand, actually.
7:00
Shortly we will record another video explaining the motor-generators to complete the hybrid system,
7:09
and finally understand the battery, inverter and motor-generator.
7:13
See you soon in the next video, thank you very much for following us.