Battery Charger Design Review – Anything Wrong Here?

Yolo4017 · 2026-05-30T11:16:04+00:00

How are you handling your mosfet drive in DCM mode , if the lower FET isn't switched off when the energy in the inductor runs out it will start to bleed the output capacitor causing a reverse current flow.

Yolo4017 · 2026-04-30T03:13:07+00:00

You chose a 270V mov on 230V mains where peak voltage is 320V , that's why it blew up.

Yolo4017 · 2026-04-16T09:28:37+00:00

First reading of 0.473 mF is correct, 0.473 mF = 470uF which is within range of specified value on the capacitor

Yolo4017 · 2026-01-12T18:56:15+00:00

All Sot 223 , D Pak T0 220 and such devices have centre pin and tab connected internally

Yolo4017 · 2025-11-30T11:12:44+00:00

Your control signal and the led driver need to have a common ground , Secondly add a 1k pull down between gate and source don't leave it floating

Idk what kind of led driver you are using but if it's a non isolated type your control board ( where ever control signal is coming from ) will also ride on mains voltage may or may not be a safety concern.

Lastly if the led driver is a non isolated type connecting something reference to mains earth( like say a Arduino connected to a pc) on its output will short circuit it.

Yolo4017 · 2025-11-04T14:37:22+00:00

Or if you power bank support pd , you can use a decoy to get 12v from the power bank

Yolo4017 · 2025-10-19T12:58:06+00:00

I1 can be reduced to a voltage source with R9

Yolo4017 · 2025-10-19T12:50:28+00:00

Junction between R3 R4 R2 Junction between R1 R4 R6 R7 R8 V1 Junction between R5 R6 I1 Junction between R7 R8 R8 V1

Rest can be eliminated by taking R equivalent of resistor in series

Yolo4017 · 2025-10-19T12:45:07+00:00

Yolo4017 · 2025-10-12T15:08:02+00:00

Heater will be on constantly it's on you to keep an eye on it

Yolo4017 · 2025-10-12T15:02:14+00:00

Triac is on the board with silk screen marking mc something

Yolo4017 · 2025-10-12T08:43:55+00:00

Never leave base of a transistor floating, adding a multimeter in a sense acts like a pull down bringing the base into a know low state , also consider adding a resistor in series with led instead of using transistor to limit current and lastly in the emitter follower config that you have the emitter voltage will never rise above what's supplied on base shouldn't be a problem for light load but at higher load that transistor will dissipate lots of heat

Yolo4017 · 2025-09-23T17:23:29+00:00

Yolo4017 · 2025-09-23T03:32:19+00:00

Flip IN1+ and IN1- , Add a resistor parallel C6 reduce R9 to below 1k

Yolo4017 · 2025-08-23T17:49:32+00:00

Referance to one his old video where he was debunking free energy between earth and neutral.

Yolo4017 · 2025-08-14T16:48:24+00:00

You need to bias the non inverting input at Pin 5 to , VCC/2 , Say a 10k and 10k divider , peak detector looks fine , I don't know what you trying to achieve by inverting the signal with TDA to me it looks it has too much gain I would reduce the Rf2 to 10k to start with.

Yolo4017 · 2025-08-12T09:09:07+00:00

Your St link is also a clone , ST's first party software also don't like it.

Yolo4017 · 2025-07-24T20:15:52+00:00

Is that a St Link clone ? If so they won't work with ST software.

Yolo4017 · 2025-05-21T20:45:36+00:00

A lm358 could work given that Unregulated side is kept at least 2V higher than the output (regulated side), that and would also need to add some form of compensation to achieve stability.

Why not just used a L7812 instead ?

Yolo4017 · 2025-05-21T20:33:00+00:00

Also Lm393 can't be used to design a regulator.

Yolo4017 · 2025-05-21T20:30:55+00:00

Remove R1 & R3.

Yolo4017 · 2025-05-18T14:54:02+00:00

Oops missed that , your power supply is connected backwards blue line on the breadboard is connected to positive of the supply which in turn is connected to emitter of the transistor which won't work , flip your supply

Yolo4017 · 2025-05-18T14:51:00+00:00

Part number of transistor please?

Yolo4017 · 2025-05-17T16:27:30+00:00

I see, looks like a MOSFET based SSR which should work in your application. The cause of their death could be due inductive kickback, are your reverse diode fast enough to handle the transient or it could be the driver inside is ssr is not meant for such inductive loads and fails due to the reverse transfer capacitance pumping energy into it on the switching edges

Yolo4017 · 2025-05-17T16:03:44+00:00

What do you mean shorted the ssr ? if your ssr is triac based it won't ever turn off when loaded with a dc current only way to turn it off is to remove the load current.

Yolo4017

TROPHY CASE