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Power Electronics Europe News
Over-voltage protection is added to supercapacitor balancing PCBs
Claiming to transform the balancing of large supercapacitors, the company now offers its precision dual-channel SABMBOVP2XX family, which automatically balance supercapacitors, with over-voltage protection (OVP). It enables energy-efficient supercapacitor balancing for for products that require low-loss energy power, leakage current regulation, and OVP,such as automotive, transportation, automation, data centers, and power grids.

Supercapacitor cells typically operate at a nominal recommended working voltage. However, voltages that exceed the maximum rating for a prolonged period will reduce cell operating life. Each supercapacitors has tolerance differences in capacitance value, internal resistance, and leakage current. When two or more are connected, either in a series or in parallel, these differences cause an imbalance in cell voltages that must be addressed so that no one cell exceeds its maximum rated voltage.

The OVP board is believed to be the only commercially available balancing scheme that manages both over-voltage and leakage current. The board’s circuit offers matched precision push–pull voltage/current action, which is ideal for cells with a minimal amount of energy loss, says the company.

The SABMBOVP2XX PCBs enable sophisticated precision voltage clamp circuits with extremely high current gains, for balancing large supercapacitors that are stacked in a series, from two to hundreds of cells and with values of 0.1F to 3,000F.

The SABMBOVP2XX PCB is populated with one of the company’s ALD9100XXSALI Supercapacitor Auto Balancing (SAB) MOSFETs, which specify the circuit threshold or clamping voltage to balance the circuit with near-zero charge loss. The balancing output current from the SAB MOSFET is amplified to produce (nominally) 1mA of balancing output current at Vin, which is equal to the rated SAB MOSFET threshold.

The PCBs are compact, measuring 15.24 x 40.64mm (0.6 x 1.6 inches). Operating temperature range is -40 to 85°C. The PCBs are made with RoHS-compliant FR4 material and supplied ready for mounting a single ALD9100XX, eight-lead SOIC.



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