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absalom-muc / MHI-AC-Ctrl

Reads and writes data (e.g. power, mode, fan status etc.) from/to a Mitsubishi Heavy Industries (MHI) air conditioner (AC) via SPI controlled by MQTT
MIT License
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TSR 1-2450e in pcb design #102

Closed hjkoster400d closed 1 year ago

hjkoster400d commented 2 years ago

Hi there,

First of all, thanks for sharing this awesome project. I was wondering if you considered using the tsr 1-2450e instead of the non-e variant. The e variant has built-in capacitors so it removes the need for the 2 external ones.

Any thoughts?

Greets Rik

absalom-muc commented 2 years ago

Thank you for pointing me to TSR1-2450e. Have you found a comparison TSR1-2450 vs. TSR1-2450e? Spontaneously I found only that TSR1-2450e has a slightly lower Voltage Set Accuracy of +/-4% compared to TSR1-2450 of +/-2% (which should be no issue for our application). For both an internal filter with internal capacitor is mentioned.

In general, I don't know if the planned 22µ and the 100n capacitor are needed. According to the datasheet of TSR1-2450 for input voltage higher than 32 VDC (we have 12V) the external capacitor is needed and the 100n capacitor is not mentioned. However, I added them from the beginning to reduce noise. I could imagine that they are unnecessary. But to be honest, I was not motivated to make exhaustive tests without the external capacitors.

hjkoster400d commented 2 years ago

The e-variant has a bit less efficiëncy (92% instead of 94%) also the noise reduction is a bit better when using the 1-2450. But the price of the e-variant is lower, and it saves the 'need' for the external capacitors. I've some additional pcb's laying around, i will try to put a 2450e and let you know the results.

absalom-muc commented 1 year ago

@FloR012 confirmed that it works with the 'E'-version.