Pages: [1]   Go Down
Author Topic: HELP! battery charger circuit design  (Read 865 times)
0 Members and 1 Guest are viewing this topic.
Offline Offline
Newbie
*
Karma: 0
Posts: 19
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

I have a circuit that is connect to a battery and a charger
See picture below.




What I need is when I disconnect the battery the charger is also disconnected from the circuit.  How can I do this?

Logged

United Kingdom
Offline Offline
Tesla Member
***
Karma: 224
Posts: 6619
Hofstadter's Law: It always takes longer than you expect, even when you take into account Hofstadter's Law.
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

Does the circuit include a voltage regulator? Or maybe it can handle a certain amount of overvoltage in some other way? What type of battery is it?

Depending on the answers to the previous questions, you may be able to detect that the battery is disconnected by detecting excessive voltage output from the charger, and use that to disconnect the circuit.
Logged

Formal verification of safety-critical software, software development, and electronic design and prototyping. See http://www.eschertech.com. Please do not ask for unpaid help via PM, use the forum.

Offline Offline
Newbie
*
Karma: 0
Posts: 19
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Yes it does include a voltage regulator from the charger to the circuit.  However, is this only accomplished with an increase in voltage detection?
Logged

Left Coast, CA (USA)
Offline Offline
Brattain Member
*****
Karma: 361
Posts: 17294
Measurement changes behavior
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Quote
What I need is when I disconnect the battery the charger is also disconnected from the circuit.  How can I do this?

Perhaps a DPST switch, one pole for the battery and one pole for the charger?

Lefty
Logged

Offline Offline
Newbie
*
Karma: 0
Posts: 19
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Quote
Perhaps a DPST switch, one pole for the battery and one pole for the charger?

What DPST switch (an image would help) can I use that once I remove the battery the power is cut off to the circuit.  I was thinking of a relay however it keeps latching which is not good.
« Last Edit: March 16, 2013, 03:28:17 pm by baligena » Logged

Left Coast, CA (USA)
Offline Offline
Brattain Member
*****
Karma: 361
Posts: 17294
Measurement changes behavior
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Quote
Perhaps a DPST switch, one pole for the battery and one pole for the charger?

What DPST switch (an image would help) can I use that once I remove the battery the power is cut off to the circuit.  I was thinking of a relay however it keeps latching which is not good.

You mean like this?

http://www.kpsec.freeuk.com/symbols/swdpst.gif

http://images.wikia.com/guitarbuilding/images/6/6a/DPST_Switch.jpg

Lefty
Logged

Pages: [1]   Go Up
Jump to: