The calculation for fixing the reference voltage for U1:A as follows The voltage obtained from these dividers in turn feeds the reference voltage to the individual Opamp U1:A,U1:B…U1:D. In order to fix the reference voltage for these charge levels a simple voltage divider is constructed using the resistors R2,R3,R4,R5 and R6. The next step is to fix the reference voltage for each charge levels 100%,75%,50% and 25%. Using the status of the LED’s the charge level of the battery is determined. We have used U1:A with Blue LED for 100% indication, U1:B with Green for 75%, U1:C with Yellow for 50% and U1:D with Red for 25% of charge level. Thus we obtained a output voltage of about regulated 5.1V from the battery.Ĭircuits Library - 220+ practical circuitsĪ quad Opamp IC LM324 was used as an comparator or activator for the charge indication LED’s. Once it is connected a 1N4733A a 5.1V, 1W Zener diode is used to regulate the voltage along with a series resistor R1 which controls the current flow through zener. Initially connect the battery for charge testing to the circuit. For easier understanding let’s analyze the circuit in a step by step manner. The Voltage measured to the corresponding charge levels forms very important reference to the above circuit. You can find these details in the datasheet of the manufacturer, almost all 12V batteries carries the same properties but datasheet is always worth looking for. Now for a typical 12V battery the voltage at various charge levels will be Voltage measured I am going to take a 12V Li battery and keeping it as an example, the design the battery charge indicator circuit is explained below. Let’s design a simple circuit to know the percentage of charge in a battery. Failure to that may cause the battery dead, so now you would’ve known that knowing the charge in the battery is very necessary to keep the battery alive. ![]() Li batteries should be used in such a way that always 20% of the battery’s charge is left before recharging it. Li batteries proves to be very useful source of power but for long lasting performance you need to look on to key parameters carefully. In fact you can build one with minimal components and little sweat. But its not necessary you have to buy one of these modules to use your Li battery in a effective way. These kind of indicators generally measures the voltage in the battery and indicate the charge by turning up any appropriate LED’s. The fused supply wire and the QuickLink cable are both included in the package, avoiding the need for a separate connection kit.įor more information, please download the brochure from the link below, or check this YouTube video for general installation information.Battery charge indicator circuits are very useful modules for efficient use of the Li batteries. Furthermore, the battery minus cable must be interrupted in order to insert the shunt into the high current circuit. The installation time is minimal, requiring only one supply wire to the intelligent shunt base and a single plug and play ‘QuickLink’ cable between the shunt base and the control/display unit (CDU). So any lead- or lithium based battery from 12V up to 48V can be monitored. The Expert Modular battery monitor can measure DC currents up to 600Amps (500Amp continuous) and voltages up to 70Vdc. The inputs for battery bank 2 and 3 can also be configured for other purposes, like mid-point voltage measurement, keyswitch input or backlight control. The Expert Modular can monitor up to three battery banks. The end results are transferred to the Control and Display Unit (CDU) over a digital cable connection, ensuring the highest immunity against external interference even in harsh industrial applications. ![]() All measurements and calculations are made inside the active shunt module, resulting in the highest accuracy. Unlike the well known TBS Expert Lite and Expert Pro battery monitors which are based on a passive shunt for current measurement, the new Expert Modular solution is equipped with an active shunt module. ![]() The Expert Modular is compatible with lead based and Lithium batteries (LiFePO4). It also offers a large amount of additional features to optimally supervise your battery system and control external equipment. This advanced battery monitor not only shows the true state of charge of your battery system.
0 Comments
Leave a Reply. |