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Hello,
Microcontroller: STM32F303CBT6
What will drive: Dual active bridge (operation based on phase shift between bridges)
Timers used: TIM1 (primary side), TIM8 (secondary side)
As far as I understand, one timer is set as a Master, the second as a Slave, and between them you can adjust the...
Hello.
I'm studying the principle of transformer calculation for Dual Active Bridge converter.
Primary/Secondary turns 36:23
Selected core ETD 54/28/19 N87 (I haven't decided on the size of the air gap yet)
Question: Is it possible to pre-calculate the values of leakage inductance and...
@BradtheRad , Thank you for the answer!
For example - resistive load.
An example that I understand:
Vin: 800VDC, Vout range: 200-500VDC, transform ratio N = 1.6.
Initially, the transformer reduces the output voltage to 500 Volts (800 / 1.6), then we can adjust it even lower through the...
@FvM, Thank you for the answer!
I'm just learning how this converter works and I don't know all its features. I only know about the main method: phase shift. I also heard about flux-balancing.
It is not clear how by increasing the phase shift from 0 to a certain value I can both increase and...
@Easy peasy, Thank you for the answer!
For example. Purpose: Input 400 VDC, output range 200-500 VDC. Transforer ratio 1.2 (decrease).
With a phase shift of 0, the output voltage will be about 333VDC (Vin / N = 1.2).
Is it possible to achieve an output range that has values both above and below...
Hello,
I study this converter through these articles (1 , 2).
Attached is the DAB model for LTSpice.
I usually see these converters working in buck mode (input bus with constant voltage PFC, maximum output voltage is achieved through the turn ratio when the phase shift is 0). For example...
@Easy peasy, Thank you!
At the moment, I was planning to use only one inductor.
There is a more powerful (ETD)
B66367G2000X187
Approximately 9.8 turns and a maximum saturation current of 48A.
The only thing is that in its datasheet the AL and ue values are indicated only for half of the...
@barry , @KlausST , @FvM , @Easy peasy ,
Thank you for the answers!
Sorry to answer a little late. During this time, I additionally studied everything about inductors and began to better understand some of the details.
For this, I chose a ferrite of size RM14 with an air gap of 1 mm. Its...
Hi,
I'm selecting ferrite core to create a resonant inductor in an LLC converter.
Required parameters of the inductor:
1) Inductance - 18.2uH
2) Max current - 13A (3.3kW)
3) Frequency range(min-max) - 100-400kHz
I'm only now dealing closely with the construction of inductors.
After studying...
After a while, I rechecked the formulas and it turned out yes, they are similar. In the first formula, I misidentified the last parenthesis of the divider. (I counted it as fn to the -1)
I have plotted gain plots in Octave on several formulas:
Octave code...
@Easy peasy , @BradtheRad ,
Thank you for the answer!
Yes, the power is about 2kW, so I chose Full-Bridge.
Didn't know about LT-Spice, it should help!
@BradtheRad , yes.
For example, a full-bridge gives a range of +Vin...- Vin (+400...-400VDC), and a half-bridge only half of +Vin...GND...
Hello,
After reviewing various LLC converter design books, I have identified several different voltage gain formulas.
1) Half-Bridge Gain Equation (YouTube)
Result: 0.90
2) TI LLC handbook (I did not understand what j is, so I did not take it into account in the calculations.)
Result: 0.87...
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