The primary goal of this text is to assist design engineers in choosing the fitting battery administration and charging IC and finishing their proof of idea (PoC) part. The sources supplied embrace schematics, invoice of fabric (BOM), design recordsdata, GUI interface software program, and so on
The lithium-ion (Li-ion) cell is among the most typical vitality sources in right this moment’s battery-driven world. Li-ion cells have good vitality density and will be recharged. However they’re very unstable and thus require specialised chargers to maintain the battery and gadget secure.
The primary goal of this text is to assist design engineers in choosing the fitting battery administration and charging IC and finishing their proof of idea (PoC) part. The sources supplied embrace schematics, invoice of fabric (BOM), design recordsdata, GUI interface software program, and so on.
All of the reference designs within the article can be utilized as unbiased cell chargers. Among the designs are sufficiently small to be built-in right into a product as a sub-system for charging an in-built battery.
On this article, we’ll talk about the important parameters of every of the Li-ion chargers. Desk 1 lists the vital parameters of all of the charging reference designs.
The TI TIDA-00590 is a quick charger reference design module from Texas Devices. It’s able to quick charging a single Li-ion cell with 5A cost present with low thermal finances. The circuit design has been examined by TI and makes use of the EVM GUI and getting began information.
TIDA 00590 utilises two charging ICs marked as U1 and U2 in a twin IC configuration, which offers greater than their 5A most cost present and distributes the warmth loss throughout the board extra effectively. The charging IC bq25890/2 is a extremely built-in 5A switch-mode battery cost administration and system energy path administration gadget for single-cell Li-ion and Li-polymer batteries.
To realize greater effectivity, the module affords a low impedance energy path, which additionally reduces battery charging time whereas extending the battery life throughout discharging part. The IC additionally integrates enter present optimiser (ICO) and resistance compensation (IRCOMP) to ship most charging energy to the battery.
The module is over 90% environment friendly with a most effectivity of about 94%. The effectivity of the charger decreases because the cost present is elevated.
This gadget helps numerous enter sources, which embrace a normal USB host port, USB charging port, and USB compliant adjustable excessive voltage adaptor. Moreover, it makes use of MaxCharge handshake utilizing D+/D– pins and DSEL pin for USB change management.
The gadget is compliant with USB 2.0 and USB 3.0 energy specs with enter present and voltage regulation. The charger options a number of security options, together with battery temperature adverse thermistor monitoring, charging security timer, overvoltage/overcurrent protections, undervoltage safety, and over-discharge safety.
The charger additionally employs a TS3USB221A, which is a high-bandwidth change that requires a 3.3V provide. Since there are two charging ICs with a single USB I/O for the charger, each the facility administration ICs must work in sync and must switch information concurrently. Subsequently, there’s a necessity for a USB hub or controllers.
The TS3USB221A answer can successfully broaden the restricted USB I/O by switching between a number of USB buses to interface them to a single USB hub or controller. The change works as a multiplexer; it takes a single USB enter and offers output to each the bq25890/2 charging ICs. To supply a 3.3V output to the TS3USB221A, an LDO LP2985AIM5-3.3/NOPB is used.
The module is appropriate to be used in cell phones, cameras, tablets, standalone chargers, and so on. Yow will discover all of the sources for TIDA 00590 by scanning the QR code.
The MCP1630 Li-ion charger is a flexible charger design able to charging as much as two single-cell Li-ion battery packs in a parallel configuration. The facility prepare used for the MCP1630 is a SEPIC. The module can take inputs wherever from 10V to 28V and as much as 16 modules will be daisy-chained for charging extra cells.
The MCP1630 multi-bay Li-ion charger has the flexibleness to optimise the charging algorithm for brand spanking new battery expertise and add proprietary options by coding the microcontroller. The charger affords a number of charging options, reminiscent of enter overvoltage safety, battery overvoltage safety, thermal shutdown, battery-temperature monitoring, and battery-pack fault monitoring. It may additionally detect the standing of the battery together with the insertion and elimination of the battery pack.
The mind of the charger is PIC18F2410. which is an enhanced flash microcontroller with 10-bit A/D. The microcontroller runs at a frequency of 40MHz and offers excessive computational efficiency together with decrease energy consumption.
The reference design additionally has programming header pins required for updating the firmware of the microcontroller. It additionally employs a twin op-amp MCP6292. The battery charger mechanically detects the insertion or elimination of a battery pack.