Modifying Parkside PLG 20 A1 Charger for Continuous Operation with Converted Batteries

Hi
Have any of you ever converted a drill charger so that it works all the time? I have a Parkside 20V charger, the charger only works when it detects a battery. This works reliably through the voltage difference on the 3 pins. I need to use this charger for another battery, which I converted from Ni-Mh cells to Li-Ion (max voltage 21 V, BMS with load balancer), unfortunately I do not have a charger for it.

The problem is that I don't know what to connect to this Wednesday pin on the charger to force charging (only 2 wires go to my battery and BMS). I want to make some kind of switch and an extra socket to keep the current mechanism and switch to charging another battery if necessary. How to make the charger give the target voltage? Now when you turn it on, it is in standby mode, it starts charging after connecting the battery dedicated to it.
Regards

What chips are used in the charger? The picture of the underside of the plate is illegible.

This is exactly what it looks like:

Hello
I have the same charger that was more seriously damaged.
I replaced the transistor with 5n60, abs10 bridge diode, a few more smd resistors, the copper bus between Drain 5n60 and the ferrite transformer. But powered by an electric lamp - the circuit still does not work, and the lamp lights up at maximum. Measure voltave acros there is a small smd element - with the body code q2se does anyone know what this is?

measure capacitor voltage 47µ/400V = 0V.
I think the power transistor is constantly unlocked.

Danas sam zamenio Q2SE sa LD7536, i punjač je proradio. Nadam se da će nekome pomoći

Dodano po 43 [sekunde]:

Today I replaced the Q2SE with the LD7536, and the charger worked. I hope it will help someone

Hi @jama1234 ,

Did you find a solution ?
I've the same problem.

jama1234 wrote:

Have any of you ever converted a drill charger so that it works all the time? I have a Parkside 20V charger, the charger only works when it detects a battery. This works reliably through the voltage difference on the 3 pins. I need to use this charger for another battery, which I converted from Ni-Mh cells to Li-Ion (max voltage 21 V, BMS with load balancer), unfortunately I do not have a charger for it.

The charger with the battery communicates with this third pin by means of some series of pulses repeated cyclically, which is rather impossible to cheat.
Question to my colleague @xanderkg what was the fault before replacing this driver?

A charger should be used for the purpose it was built. Makes no point to use it for something else, since it is programmed to behave in a specified manner: e.g: first stage constant voltage, then constant current...etc. Therefore what you will connect at its output, will not work properly.

Hey
Helpful information. Thanks to the photos posted, I was able to fix the charger.
I replaced the burnt ABS10 rectifier bridge and the T3.15 A fuse and the charger works .
Thank you and best regards, Jasiek

>>18221073
Hi. Q5 is a dual P-MOS (usually 4935/4953), trigger it to "on" state or short the DS terminals (PIN 5 to 8 on SO-8 case) so your battery will be always (or when needed) connected to 21VDC, therefore charging constantly. However, consider somehow monitoring the state as overcharging/exceeding the charging time could result in fireworks. Cheers

Hello all!!

Any idea about the PWM driver? on label is written Q2SK.


KR
**Solved**

Replaced with LD7536

Does anyone know what the U2 IC and transistors Q6, Q11 are?

>>19593843 Good Morning I have same problem . I change many components , the integrated PWM ic1 QBRG dont work . Thank you . I try to replaced with LD7536. I will tell. Have nice day .
>>20370702

Added after 44 [minutes]:

>>21140564 Hello. Q6, Q11 are BJT-NPN Transistor (hFE=290, Ube=700mV, Ic=6,2mA). About U2, on my PCB mark (9ARF) , it must be a Correction Error Amplifier , like Kia431, or TL431. There no schematic reference to have responce. I just look the pin connection on the PCB.