I created a draft of a blog article. And I tried to edit or delete it, but I couldn't. I attached a screenshot of that time.
If possible, could you please delete this draft?
None of the threads the MEMS Microphones forum can be opened:
They all give an error "An invalid set of parameters has been specified in the url."Show Less
I'm currently comparing the Full-Bridge LLC (FB-LLC) and the Half-Bridge LLC (HB-LLC) and I'm wondering until when the usage of the HB-LLC makes sense.
HB-LLC has multiple advantages over FB-LLC. Especially when splitting the resonance capacitance Cr. This would apply more stress to the capacitance, but it also stabilizes the input dc-link voltage more. Additionally it would prevent incomplete body diode reverse recovery, which can damage the power FET due to large current caused by the high reverse recovery charge.
Therefore it seems that the HB-LLC is the more reliable and more forgiving topology.
The FB-LLC has the main advantage that it uses the whole input voltage Vin, when the HB-LLC only uses half of it Vin/2. This reduces the current stress on the components in the FB-LLC. Due to the lower current and the two more switches the heat dissipation would be less and more distributed.
With a combination of phase-shifting and frequency variation the input voltage range of the FB-LLC can be increased.
One issue in a full-bridge LLC relates to holding the input voltage bus constant enough not to effect the resonant waveforms. 
The formulas also indicate that a smaller Cr and Lm is needed in the FB-LLC, while the Lr gets bigger. This would decrease the resonance circuit, but the bridge would get bigger and more expensive due to the higher component count.
For a high power LLC converter (1.5kW) the appropriate topology would be the FB-LLC.
But when I run the numbers for the HB-LLC topology than the current of the equivalent load on the primary winding side is only 8.33A. The magnetizing current is 3.44A and the resonant current is 9.01A. These current stress values seem as manageable.
Am I missing something or is the HB-LLC here still a good choice?
Best regardsShow Less
As I found a mistake in the schematic of my sample project,
I posted the correction and comments this morning.
Then I could not find the page and when finally I found the page, it's marked as [ SPAM ]
I wonder what should I do with this.
my Merus Amp HAT sometimes stops working. To Boot the Pi doesnt help everytime. Same error one different PiOS SD-Cards. For now im not able to fix it.
Starting a MP3 seem to work. Time is running, but there ist no sound. I used different player, which all worked a few day ago.
PiOS 32bit 04.04.2022
**** Liste der Hardware-Geräte (PLAYBACK) ****
Karte 0: sndrpimerusamp [snd_rpi_merus_amp], Gerät 0: Merus Audio Amp ma120x0p-amp-0 [Merus Audio Amp ma120x0p-amp-0]
Sub-Gerät #0: subdevice #0
0 [sndrpimerusamp ]: RPi-simple - snd_rpi_merus_amp
alsamixer freezes and lock all values at 208 (see pic)
dmesg throws a lot of errors of this type:
ma120x0p 1-0020: ASoC: error at snd_soc_component_update_bits on ma120x0p.1-0020: -121
ma120x0p 1-0020: ASoC: error at soc_component_read_no_lock on ma120x0p.1-0020: -121
What can i do?
Best AndiShow Less
We want to make a rechargeable street light. Its have two sections. Battery charger and DC to DC converter. When electric supply is present the LiFePO4 Battery will be charged. If electric supply is not available in evening or night time, the street light will be ON by battery backup and Its will be OFF in day time. We will be use a 4 volt 0.10 Amp solar chip to sense dusk and down. Street lights will be operate as per dusk down. Its have the following features-
1) Input Operating working voltage------85 V to 300 V AC ( 300v to 450 volt stand by mode).
2) Output Voltage----------------------Its have two types outputs-------------
(A) Driver Output Voltage-------- Suitable for the charging of 12.8V, 20 AH Lithium phosphate LiFePO4 Battery. Battery will be charged within 5 hours. Driver wattage is not less than 80 watt.
(B) Boost converter Output---------- 40 watt ( 36 Volt, 1.12 Amp) suitable to operate 40 watt 36 volt LED strings.
3) Cut Off and protections---------------- Low and high cut off requirements in both sections (Charger and DC to DC converter). All protections also needs whose requirements in LED Street Lights. Charger and DC to DC converter will be operate in CV CC mode. Max current limit of the charger will 5 amp and converter max current limit will 1.5 amp.
4) Dc to DC converter--------Suitable to operate by 12.8 volt LiFePO4 battery. It's "ON" only during the night period. To sense day or night we will use a 4 volt 0.1 Amp Solar Chip when the solar chip voltage is greater than 1 volt then the light is "OFF" and when the solar chip voltage is less than 1 volt the Light will be "ON".Tempreture sensor can use to protect the driver from over heat.
Please design the very compact and strong driver suitable for avobe all feature. If possible design by using microcontroller.
Hi, Seems everything I look at is locked and the reply button is greyed out. I got a message when I tried to reply to a post that said " Sorry, either you cannot reply to the topic or you have not verified your email address by clicking on the verification link in the email we sent you when you registered". I have been a member since Sept 22, 2021. I cant find the original registration email. How do I get permission to reply to a post?
I saw a board called Community Translation, but there was no explanation on how to participate, so I'm asking.
I'm curious to see if I'll be working on translating English documents into other languages if I participate there.
I would like to translate it into Korean if possible, but I am curious about how to participate.Show Less
this new feature is very annoying, it takes away 1/3 of the screen on mobile device. Please consider reviewing it.