Dear Colleagues, I would like to ask you to explain the operation principle and practical suitability (advantages) of the additional Q1 transistor as I believe - current source? Does it improve the stabilization of the output voltage? greetings Charles

This current source on Q1 stabilizes the current flowing through DZ1, which causes that the voltage on these Zener diodes = 285V is more stable - because it reduces the effect of supply voltage, including grid voltage at Uwa = 280V. It's just that there is an error because the R5 value is too big - 560 Ohm gives the source current around 1mA, and it should be about 5-10mA. In addition, the value of R7 in combination with C5 and C6 will cause Uwy to slowly increase after switching on.

This can be an advantage of the system.

Maybe - there is a soft starter in the form of Rly1, Rly2, R1 - switched on after 40 / 60sec. But I just pay attention to it, just like the error R5.

myself No, I misunderstood. Increase R7 and C5, or use Rly2 delay (and increase R1 if necessary).

Right, even a small current value for diodes has come to me ... And can you still improve - increase the rise time?

Reduce capacity - especially C4,5,6, reduce R7 (or even shorten it), R2 and R3.

Hello, I have probably expressed myself wrong ... I meant to increase the time of increasing the output voltage, and reducing the capacity is probably the opposite effect?

anode voltage supplyLithium Ion 18650 Capacity Checker - Adam's Arduino Projects

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#1 15784037 03 Jul 2016 15:42

arsonus arsonus

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Post #1
15784037 03 Jul 2016 15:42

Dear Colleagues,

I would like to ask you to explain the operation principle and practical suitability (advantages) of the additional Q1 transistor as I believe
- current source?
Does it improve the stabilization of the output voltage?

greetings
Charles

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#2 15784100 03 Jul 2016 16:19

Anonymous Anonymous

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Post #2
15784100 03 Jul 2016 16:19

This current source on Q1 stabilizes the current flowing through DZ1, which causes that the voltage on these Zener diodes = 285V is more stable - because it reduces the effect of supply voltage, including grid voltage at Uwa = 280V.

It's just that there is an error because the R5 value is too big - 560 Ohm gives the source current around 1mA, and it should be about 5-10mA.
In addition, the value of R7 in combination with C5 and C6 will cause Uwy to slowly increase after switching on.
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#3 15784122 03 Jul 2016 16:36

jdubowski jdubowski

Tube devices specialist

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Post #3
15784122 03 Jul 2016 16:36

trymer01 wrote:
In addition - the value of R7 in combination with C5 and the value of C6 will cause that Uwa will slowly grow after switching on.

This can be an advantage of the system.
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#4 15784186 03 Jul 2016 17:07

Anonymous Anonymous

Level 1

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Post #4
15784186 03 Jul 2016 17:07

jdubowski wrote:
This can be an advantage of the system.

Maybe - there is a soft starter in the form of Rly1, Rly2, R1 - switched on after 40 / 60sec.
But I just pay attention to it, just like the error R5.
#5 15784204 03 Jul 2016 17:18

arsonus arsonus

Level 10

» | Topic author Helpful post? (0)

Post #5
15784204 03 Jul 2016 17:18

trymer01 wrote:
This current source on Q1 stabilizes the current flowing through DZ1, which causes that the voltage at these Zener diodes = 285V is more stable - because it reduces the effect of supply voltage, including grid voltage at Uwa = 280V.

It's just that there is an error because the R5 value is too big - 560 Ohm gives the source current around 1mA, and it should be about 5-10mA.
In addition, the value of R7 in combination with C5 and C6 will cause Uwy to slowly increase after switching on.

Right, even a small current value for diodes has come to me ...
And can you still improve - increase the rise time?
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#6 15784300 03 Jul 2016 18:01

Anonymous Anonymous

Level 1

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Post #6
15784300 03 Jul 2016 18:01

arsonus wrote:
can still be improved - increase the rise time?

Reduce capacity - especially C4,5,6, reduce R7 (or even shorten it), R2 and R3.
#7 15784345 03 Jul 2016 18:21

arsonus arsonus

Level 10

» | Topic author Helpful post? (0)

Post #7
15784345 03 Jul 2016 18:21

Hello,
I have probably expressed myself wrong ... I meant to increase the time of increasing the output voltage, and reducing the capacity is probably the opposite effect?
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#8 15784358 03 Jul 2016 18:28

Anonymous Anonymous

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Post #8
15784358 03 Jul 2016 18:28

arsonus wrote:
I think I did not
myself

No, I misunderstood.

arsonus wrote:
I wanted to increase the rise time of the output voltage

Increase R7 and C5, or use Rly2 delay (and increase R1 if necessary).

#9 15784384 03 Jul 2016 18:39

arsonus arsonus

Level 10

Post #9

15784384 03 Jul 2016 18:39

... now everything is clear on the subject
Thank you for the explanation and best regards
Charles

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Topic summary

The discussion centers around the operation principle and advantages of an additional Q1 transistor in a lithium-ion 18650 capacity checker circuit. The Q1 transistor serves as a current source that stabilizes the current through Zener diodes (DZ1), enhancing the stability of the output voltage at 285V by mitigating the effects of supply voltage fluctuations. However, it was noted that the resistor R5 is incorrectly sized, leading to insufficient current (1mA instead of the desired 5-10mA). Suggestions were made to adjust component values, such as reducing the capacitance of C4, C5, and C6, and modifying R7 to improve the rise time of the output voltage. The conversation concluded with the author expressing gratitude for the clarifications provided.
Summary generated by the language model.