Advanced Linear Devices Releases a New Device for Balancing Supercapacitor
The use of multiple supercapacitor cell modules has increased in recent years to meet the needs of storing higher voltage systems. A number of industrial systems today require high-current energy storage that necessitates the use of multiple supercapacitor cells.
Safe balancing of voltage is necessary to ensure the extended life of the staked supercapacitors. A new board developed by Advanced Linear Devices Inc. (ALD) specifically addresses this issue.
SABMB6 – An Insight Look
SABMB6, the new device manufactured by ALD, is 15.24 mm by 40.64 mm in size. The board can join both two-channel PCBs i.e. SABMB2, and also four-channel PCBs i.e. SABMB16. These multiple channels can be cascaded using mix-and-match reconfigurability, which auto-balance the supercapacitor cells in the stacks.
ALD’s new board is made of an FR4 RoHS-compliant material. The operating temperature range of the device is -400C to +850C.
The new board has the option of installing reverse-biased external power diodes. These diodes can be installed to reduce the current transients inside the circuit. Moreover, the board is also available as a blank PCB to which designers can insert custom SAB MOSFETs. This reduces the need for a significant modification of the PCB.
Supercapacitor Auto Balancing Feature
One of the highlights of ALD’s new board the SABMB6 that have the ability to balance up to six supercapacitors. The latest six-channel board can support almost any size supercapacitors.
The SABMB6 can perform supercapacitor auto-balancing (SAB) that protects the circuit from over-voltage. It targets 12-V battery applications whereby the cells are stacked in parallel or series. Up to six supercapacitors can be connected in a stack using the device.
The supercapacitor cells are balanced automatically by ALD9100XX SAB MOSFETs. There are three MOSFETs present on the board that balances the cells by equalizing the leakage current in every cell.
The board allows charging and also discharging current of the supercapacitor cells. This allows the currents to pass through the cells directly resulting in zero leakage. This prevents dissipation of additional power that is used by the circuitry.
How SABMB6 Auto Balances Leakage Current?
When MOSFET is connected across a supercapacitor, an increase in the supercapacitor’s voltage results in a decrease in the RDS(ON). This will decrease the voltage resulting in a decrease in IDS(ON). The auto-balancing in supercapacitor occurs automatically.
The auto-balancing works for different types of supercapacitors with different current leakage characteristics. The balancing results in the reduced current drain. The device can automatically adjust to different environmental changes including time and temperature that may contribute to current leakage.
In case of a stack with different supercapacitor in series, multiple arrays of SAB MOSFET balance the leakage in the current. This prevents the fluctuating voltage from damaging the circuit.
By offering a plug-and-play solution, ALD’s SABMB6 can balance the leakage of the current in the supercapacitor. This will save effort and time of designers in integrating auto-balancing feature when designing the board.
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