Quank
New Member
Hi everybody!
I'm trying to build a battery discharger. The main goal is to discharge a battery LiPo of 40AH in aprox 4 o 5 hours (at aprox a 15A pace!).
The battery gives 3.7 V aprox when is charged and decreases its voltage as will discharging.
The nature of the battery implies not to discharge beyond 2.8 V (to preserve charging properties).
The circuit I've attached in this thread connects the battery to 2 power resistances, of 0.5 Ohm each, in parallel. In order to disconnect the battery when voltage is too low, I use a transistor and 2 relays. The transistor is switched when the comparator detects that the voltage is too low. The comparator uses a diode to set the voltage reference and a voltage divisor for comparing the voltage.
I built the circuit and it works perfectly when no resistances are connected. When I connect the resistances the relays start to vibrate a lot when the voltage is upper than 2.8 V. How I can prevent relays vibration?
Thank you in advance.
Quank
I'm trying to build a battery discharger. The main goal is to discharge a battery LiPo of 40AH in aprox 4 o 5 hours (at aprox a 15A pace!).
The battery gives 3.7 V aprox when is charged and decreases its voltage as will discharging.
The nature of the battery implies not to discharge beyond 2.8 V (to preserve charging properties).
The circuit I've attached in this thread connects the battery to 2 power resistances, of 0.5 Ohm each, in parallel. In order to disconnect the battery when voltage is too low, I use a transistor and 2 relays. The transistor is switched when the comparator detects that the voltage is too low. The comparator uses a diode to set the voltage reference and a voltage divisor for comparing the voltage.
I built the circuit and it works perfectly when no resistances are connected. When I connect the resistances the relays start to vibrate a lot when the voltage is upper than 2.8 V. How I can prevent relays vibration?
Thank you in advance.
Quank