Dual-Level Float-Cum-Boost Charger with Pre-Charge for 12V – 3 to 6Ah Sealed Lead Acid (SLA) Batteries

This SLA Battery charger project is the right choice if you want to obtain maximum battery service life and capacity, along with acceptable recharge time and economy, constant current, constant voltage, and even charge a deeply discharged battery. The project contains all the necessary circuitry to optimally control the charging of valve-regulated lead-acid batteries. The circuit controls the charging current as well as the charging voltage to safely and efficiently charge the battery, maximizing battery capacity and life. The circuit is configured as a simple dual-voltage float-cum-boost charge controller. It is configured for charging 3 to 6Ah, 12V SLA batteries with dual-level float-cum-boost charger with pre-charge function and provides 500mA current output. The circuit also helps to charge deeply discharged batteries with pre-charge function. In this function Pin 12 (CE) detects the battery voltage, if the voltage at pin12 (CE) is bellow V-ref (2.3V), enable comparator permits a pre-charge current IPRE to flow from the PRE-CHG pin through Resistor R7 into the battery. Once the battery voltage rises above a safe threshold, the comparator disables the pre-charge function and IC performs the dual-level charging operations. Connector CN1 provided for supply input, CN2 battery, D3, D2 operation indictor, Jumper J1 connected to GND. Transistor Q1 requires an appropriate heatsink.

Note: The project is configured to charge 12V, 3- 6Ah batteries, but the circuit can charge higher (Ah) current and voltage batteries with few changes, carefully refer to the datasheet of the IC for various options and configurations.

The project is built using BQ24450 IC from Texas instruments, which has built-in precision voltage reference that is especially temperature-compensated to track the characteristics of lead-acid cells, and maintains optimum charging voltage over an extended temperature range without using any external components. The ICs low current consumption allows for accurate temperature monitoring by minimizing self-heating effects. The project is configured to charge a 3-5Ah battery with dual-level float-cum-boost charge with pre-charge, but IC can support a wide range of battery capacities and charging currents, limited only by the selection of the external pass transistor. The versatile driver for the external pass transistor supports both NPN and PNP types and provides at least 25mA of base drive. In addition to the voltage- and current-regulating amplifiers, the IC features comparators that monitor the charging voltage and current. These comparators feed into an internal state machine that sequences the charge cycle. Some of these comparator outputs are made available as status signals at external pins of the IC. These status and control pins can be connected to a processor, or they can be connected up in flexible ways for standalone applications.

Charging LED1, LED2

  • STAT1 ON (LED D3-ON), STAT 2 OFF (LED D2- OFF) >> Bulk Charge Condition
  • STAT1 ON (LED D3-ON), STAT 2 ON (LED D2-ON)>> Boost Mode Condition
  • STAT1 OFF (LED D3-OFF), STAT 2 OFF (LED D2-OFF) >> Float Mode Condition

Features

  • Operating Power Supply 16V to 18V DC, 1A
  • Load Battery 12V DC – 3Ah to 6Ah
  • Maximum Current Output 500mA
  • Float Voltage 13.8V, Boost Voltage 14.7V
  • Pre-Charge Current 10 mA
  • PCB Dimensions 63.98 x 39.85 mm

Schematic

Parts List

NO.QNTY.REF.DESCMANUFACTURERSUPPLIERPART NO
12CN1,CN22 PIN SCREW TERMINALS 5.08MM PITCHPOENIXDIGIKEY277-1247-ND
21C11uF/25V SMD SIZE 1206 OR 10uF/50V ELECTROLYTIC MURATA/YAGEODIGIKEY
31C20.1uF/50V SMD SIZE 0805MURATA/YAGEODIGIKEY
44R2,C3,R5,R14DNPDIGIKEYOMIT
51D1MBRS360ON SEMIDIGIKEYMBRS360T3GOSCT-ND
62D2,D3LED SMD SIZE 0805OSRAMDIGIKEY475-1415-1-ND
71J1JUMPER/SHUNTSULINSDIGIKEYS9001-ND
81Q1TIP32G TO220ON SEMIDIGIKEYTIP32GOS-ND
93Q2,Q3,Q5BC847 SMD SOT23-3NEXPERIADIGIKEY1727-2924-1-ND
101Q4FDN327N SOT23-3ON SEMIELEMENT141471048
111R10.5E /2W SMD 2512STAKEPOLEDIGIKEYCSRN2512FKR500CT-ND
121R3DNPOMIT
131R4215K 1% SMD SIZE 0805MURATA/YAGEODIGIKEY
146R6,R9,R12,R19,R20,R230E SMD SIZE 0805MURATA/YAGEODIGIKEY
151R7187E 1% SMD SIZE 0805MURATA/YAGEODIGIKEY
162R8,R17330K 1% SMD SIZE 0805MURATA/YAGEODIGIKEY
171R10715E 1% SMD SIZE 0805MURATA/YAGEODIGIKEY
181R1116.9K 1% SMD SIZE 0805MURATA/YAGEODIGIKEY
191R13590K 1% SMD SIZE 0805MURATA/YAGEODIGIKEY
201R1546.4K 1% SMD SIZE 0805MURATA/YAGEODIGIKEY
212R16,R21270K 1% SMD SIZE 0805MURATA/YAGEODIGIKEY
222R18,R221.5K 5% SMD SIZE 0805MURATA/YAGEODIGIKEY
231U1BQ24450DWTRTIDIGIKEY296-24367-1-ND

Connections

Gerber View

Photos

Video

BQ24450 Datasheet

Powerful and extremely miniaturised motion controllers

With the new MC3001 motion controllers, available as MC 3001 B (board-to-board connectors) or MC3001P (28-pin plug connector), FAULHABER rounds out the MC V3.0 generation of controllers at the lower end of the performance spectrum. The controllers are extremely miniaturised and, with 1.4 amperes in continuous operation and up to 5 amperes peak current, are very powerful. They are designed as slaves for control and positioning tasks of DC-micromotors, linear DC servomotors or brushless DC-motors.

The new MC 3001 are unhoused versions of the FAULHABER motion controllers and, by means of the integrated output stage with optimized current measurement, can control DC-micromotors, linear DC-servomotors or brushless DC-motors from the FAULHABER product line from 6 to 30 millimeters. They are configured here via the FAULHABER Motion Manager software V6 (version 6.8 and higher). The very good EMC behaviour of the new motion controllers has been certified by external laboratories.

Miniaturisation and dynamics

With an overall height from 2.6 millimeters and a format from 16×27 millimeters, the new motion controllers are extremely miniaturised. They feature very high control dynamics and can be operated with 1.4 amperes in continuous operation and with up to 5 amperes peak current. With the new variants, FAULHABER has rounded off its motion controller portfolio at the lower end.

In spite of their extremely compact design, the just thumb-sized controllers feature the same functionality as well as the same interfaces (RS232 and CANopen) and encoder interfaces as the other more powerful products of the MC V3.0 generation. As an intelligent driver module, they are especially well suited for installation in customer-specific applications. The full thermal protection of the motors is ensured with the integrated thermal models and by means of the high PWM frequency.

The ideal fields of use of the new motion controllers of the MC 3001 series are applications from the areas of robotics, automation technology, machine construction as well as medical and laboratory technology. Applications in these areas often have limited space yet call for high control dynamics and high performance.

Two variants available

They are available in two variants: the MC3001 B can be plugged into a motherboard with three micro board-to-board connectors whereas the MC3001 P can be plugged in via a 28-pin plug connector. To help customers quickly and easily get to work on the development of their drive system, FAULHABER offers a starter kit that includes, among other things, a motherboard and makes it easier to get started. In addition, up to six different motherboard variants (depending on the variant of the motion controller and the used motor) are available. To meet specific customer needs, other boards can be created that may also include, e.g., an EtherCAT interface.

The motion controllers are designed for slave operation and can be easily and quickly combined with a number of higher-level master systems via standard interfaces. After basic commissioning via Motion Manager, the controllers can alternatively also be operated at any time in stand-alone mode by means of integrated sequence programs.

more information: https://www.faulhaber.com/en/news-events/news/new-motion-controllers-mc-3001-p-and-mc-3001-b/

3.5” SBC Powered by Intel® Atom x6000 Series Processors

IBASE Technology Inc. a world-leading manufacturer of industrial motherboards and embedded systems, today announces the IB836 3.5-inch single-board computer powered by robust Intel® Atomä x6000 Series (formerly Elkhart Lake) processors to meet the demands of critical real-time computing in applications spanning the retail, transport, industrial automation, and medical sectors.

To support the next generation of IoT solutions, IBASE’s IB836 comes with three processor variants with a TDP range of 6W to 12W, a maximum of 3.0GHz burst frequency, up to 50% improved CPU performance, and up to two times enhancement in graphics from the previous generation. The SBC has two DDR4 memory slots with a 32GB capacity and in-band error-correcting code (IBECC) functionality that corrects single-bit memory errors in standard, non-ECC memory. Three independent displays can be driven with up to 4Kp60 resolutions via two DisplayPort (DP & Type C) and one eDP or LVDS output.

Rich I/O connectivity and expansion capabilities on the IB836 allow connection to numerous peripherals and include 3x GbE, 2x USB 2.0, 4x USB 3.1, 2x SATA III, 1x M.2 and 1x mPCIe interface, as well as three Gigabit Ethernet ports for high-speed connections to wired devices. Measuring 102mm by 147mm, the board operates on a 9V~36V wide range power input and extended temperature range of -40 to +85°C.

IB836 FEATURES:

  • Onboard Intel® Atom™ x6000 Series processor (Elkhart Lake platform)
  • 2x DDR4-3200 SO-DIMM, Max.32GB, support IBECC
  • Support 2x DisplayPort (DP and Type-C), eDP or 24-bit dual-channel LVDS
  • 3x Intel PCI-E GbE LAN
  • 2x USB 2.0, 4x USB 3.1, 2x SATA III
  • 1x M.2 sockets (E-Key), 1x Mini PCI-E slot (Full size)
  • Watchdog timer, Digital I/O, TPM (2.0), mSATA (share with SATA port)
  • Wide-range operating temperature from -40°C to 85°C

IB836 is currently available with Intel Atom x6425E, x6413E or x6211E processor. Other features comprise TPM to enable applications to run securely and EuP/ErP power saving and intelligent scheduler to improve environmental performance.

For more information, please visit: www.ibase.com.tw

Beacon EmbeddedWorks Announces New i.MX 8M Mini Development Kit

Beacon EmbeddedWorks is excited to announce our latest new product, our i.MX 8M Mini Development Kit. Specially designed to streamline product development with our i.MX 8M Mini System on Module (SOM), the full-featured, high-performance solution includes all the necessary features to jumpstart evaluation and development. The comprehensive kit includes an LCD touchscreen panel, HDMI port, stereo input/output jacks, ethernet connectors, USB ports, PC card expansions, and all necessary cables. Fully tested and pre-certified, the SOM & Dev Kit are ideal for demanding applications where reliability and regulatory compliance are essential.

Not only do Beacon EmbeddedWorks Dev Kits provide an extensive array of hardware components, they come fully supported by our suite of software programs and Board Support Packages (BSPs). Developers can monitor and control power usage with our Wattson™ power measurement application, achieve rapid start-up with our LogicLoader™ bootloader, and select from some of today’s most popular BSPs including Android, Linux, and Windows Embedded CE. Design risk is reduced while accelerating time to market with a complete hardware and software package curated specifically to support our i.MX 8M Mini SOM.

The included SOM is based on NXP’s i.MX 8M Mini processor with a fully configurable architecture up to quad-core. Packing connectivity features including Bluetooth, Wireless, and Ethernet with a built-in secure element, the SOM is equipped to perform in highly connected environments. It further offers multimedia capabilities including camera, audio, and display. The compact SOM packs all these features into a small form factor at only 28mm x 38mm, enabling its use as a comprehensive embedded system for cutting-edge wearables and handheld devices. Whether implemented as an off-the-shelf SOM or a custom-tailored solution, rest assured knowing that Beacon EmbeddedWorks provides in-house support for the full product lifecycle.

This latest solution from Beacon EmbeddedWorks marks a continuation of our commitment to supporting customers with everything they need to transform their innovative ideas into complete devices ready to compete in today’s markets. The kit adds to Beacon EmbeddedWorks’ expanding collection of new releases alongside high-performance Renesas RZ/G2-based SOMs, long-lasting Inflexion Zynq SOMs, and industry-leading small form-factor Torpedo™ SOMs. Visit our complete product catalogue for more information on the latest embedded systems from Beacon EmbeddedWorks.

To learn more, visit beaconembedded.com

Solo V2 – Your Safety Net Against Phishing

A campaign was launched on Kickstarter for an open security key to protect your Gmail, Twitter, GitHub & more called Solo V2. Solo V2 is from the team that brought the first open-source FIDO2 security key. Modern security solutions are often expensive, making them unavailable to many. However, you can easily protect yourself from a compromised account thanks to the Solo V2 security key. Solo V2 helps reduces the risk of security breaches, as over 80% of all breaches are caused by passwords compromised through phishing email attacks. Talking about Solo V2, the company says :

“Our goal with Solo V2 is to harden physical security of the device itself while providing all the protections that come with 2FA or passwordless login.”

The Solo V2 is a complete redesign of the original FIDO2 security key. They designed the hardware to be more physically robust, the NFC performance is increased, and uses a brand new microcontroller by NXP with enhanced security features, and the firmware has been rewritten in Rust to be more modular/reusable by the community and to reduce the attack surface. Solo V2 is easy to use. No need to install any software. You can use your V2 immediately. You just have to follow the following steps:

  1. Log onto the website you desire to register your Solo V2 on and go to security settings.
  2. Typically, there is an option for enabling 2FA. In that selection, there will be an option to add a security key. Click on that, and follow the instructions to register the key.
  3. Once registered, the next time you log in to your account the interface will request you to insert the security key and touch the button to authenticate.

Solo V2 is offering the first-ever reversible USB-A connector. This connector enables you to insert the key into a USB Port,  and also helps you to decide what side you want to face up. This fixes the problem of having a key be oriented with the LED light not facing the operator.

The Solo V2 features 3 touch buttons that eliminate the stress of depressing buttons, like what’s applicable in the first version. This allows for easier activation. Solo V2 features an innovative antenna design, which enhances its performance, improving the range and field strength. Solo V2’s design strengthens the weak points that are usually present at the base of the USB connector and the PCB.  Solo V2 supports firmware upgrades. This enables users and enterprise customers to commit to the company’s authenticator knowing that they will have access and benefit from the improvements the company makes to the firmware down the road. Thanks to Solo supporting the new FIDO2 standard, you get the strongest, most secure login with protection against phishing, account takeover, and other online attacks.

About software updates, the company says:

“We believe that software must be up-to-date to be secure. Like laptops and mobile phones, security keys are adding more and more functionality, and therefore won’t be exempt from bugs and vulnerabilities. Since our very first model, all of our keys support signed firmware updates. Each device can only update to the latest firmware that has been securely signed by SoloKeys.”

The company really paid attention to the durability of the v2 series. They made it one of the most robust keys on the market. Its Components are assembled on a module, inserted in a cavity, and sealed with a layer of epoxy. This makes the keys waterproof and tamper-resistant. Its hard, robust exterior shell house inputs like USB, buttons, NFC. It has an internal PCB that contains all the sensitive circuits and a secure microcontroller. Its internal PCB is housed inside the external PCB & sealed shut using transparent epoxy.

Preventing breaches can save corporations millions of dollars. Protection from phishing can save you from major problems and personal security concerns.

For more information about the Solo V2, visit the campaign page on Kickstarter.

PowerFlex + 750W DC laboratory power supply launched

Aim TTi have introduced the first of the new QPX Powerflex+ platform. The 750W compact Bench and System DC Power supply implements a new color touch screen providing entry via touch, keypad or rotary control interface. In a compact 3U half rack bench or system compatible case.

QPX series laboratory power supplies are designed to provide flexibility in the choice of voltage and current to meet multiple diverse applications.

The new Aim TTi QPX750SP is a single output DC power supply with a maximum output power of 750 watts. It is suited to both bench-top and system applications. Voltages up to 80V and currents up to 50A are available within a defined power envelope. QPX750SP provides an added safety feature where voltages above 50V require authorization from the user to comply with SELV.

A conventional PSU has a fixed current limit giving a power capability that reduces directly with the output voltage. The Aim-TTi PowerFlex+ regulation systems enable higher currents to be generated at lower voltages within an overall power limit envelope. The output can provide more than six times the current of a conventional PSU of the same maximum voltage and power.

A balanced multi-phase converter system minimizes ripple and improves dynamic performance. This provides unusually low noise for the power level coupled with a good transient response.

In addition to the 1mV 10mA resolution metering the display gives a reading for total power. Operation limits can be set as V, I or W.

Equivalent resistance measurement of the load enables low resistance measurements to be made at high currents, using the remote sense terminals to create a four-terminal connection. This gives more reliable results for certain component types, such as magnetics and cables harness.

A comprehensive array of interfaces including USB, LAN /LXi and Quasi-analogue are standard. GPIB is available as a factory or custom fit option. QPX750SP is compatible with Aim-TTi Test Bridge software, providing graphical remote instrument control, logging and sequencing.

The QPX750SP is housed in a compact 3U half-rack width case with front ventilation and low noise fan-assisted cooling. Front and rear output and sense terminals. The Aim-TTi RM460 4U Rack houses two half rack 3U Aim-TTi products, providing full ventilation with top and bottom 1/2U rack spacing.

more information: https://www.aimtti.com/product-category/dc-power-supplies/aim-qpxseries

15V to 60V – Three-Phase Brushless DC Motor Pre-Driver

The project presented here is a three-phase BLDC motor pre-driver. The project consists of 3x half-bridge IR2101 driver IC and 6 channel high current N-MOSFETS. The project can be configured as 3 independent half-bridges H-bridge for a brushed DC motor, or a single high current brushless motor driver. The rotor position can be detected using 3 hall sensors assembled in the motor. Hall-effect shaft position sensors are used to control the switching sequence of the three 1/2 bridge outputs. The bridge voltage can vary between 15V and 60V and the maximum summed bridge current is 10A with a large size heat-sink and sufficient airflow using a fan. This motor driver can be used for multiple applications including e-bikes, battery-powered tools, electric power steering, wheelchairs, or any other application, where a BLDC motor is utilized

15V to 60V – Three-Phase Brushless DC Motor Pre-Driver – [Link]

5G Cellular Modem M.2 Adapter for Mini-PCIe Slots on SBCs

5G is the latest technology in the cellular communication space, offering faster speeds, lower latency, and enhanced capacity. 5G modems for embedded applications are largely being released in the M.2 form factor. Gateworks single board computers use Mini-PCIe slots for cellular and WiFi connectivity.

To accommodate these new 5G modems, Gateworks has released a flexible Mini-PCIe to M.2 adapter that supports modems up to 52mm in length. The M.2 slot is a B-Key slot that supports USB 2.0 & 3.0 depending on the model, with PCIe signalling optional. Dual Nano SIM slots are available on the backside of the card.

Telit 5G Modem using M.2 Adapter on Mini-PCIe slot on Gateworks GW6200 SBC

5G M.2 Cellular Modem Adapter Highlights:

  • Converts Mini-PCIe slot to M.2 B-Key Slot
  • Supports various size M.2 Cards30, 42, 50 & 52mm long 5G M.2 Modems (30mm wide & less)
  • Offers Dual Nano SIM slots
  • Supports both USB 2.0 and 3.0 (varies by model)
  • PCIe can optionally be supported at the time of order

View Product Page and Request Pricing

A Tiny Sensor In GE Development Could Enable Smartphones To Detect COVID-19 Coronavirus

A promising technology is arising in GE’s research labs. by Daniel Kruger & Dorothy Pomerantz @ ge.com

GE researchers are working on a sensor smaller than a fingertip that could find viruses and pathogens in the air. Led by Radislav Potyrailo, a principal scientist at GE Research in Niskayuna, New York, the team received a two-year research grant from the National Institutes of Health to build the tiny device.

The finished project will produce a microchip smaller than a dime with nanowells, or tiny pores, that can only be activated by a particular molecule — in this case, a molecule from the coronavirus causing COVID-19. “In each of those nanowells there are bioreceptors that are designed to recognize only the virus particle they were designed for,” Potyrailo says. “If some flu particle or pollen or bacterium appears, it won’t be recognized. It’s like a lock and key.”

read more

EA uniTFs035-ATC Mini Touch Panel

Display Visions’ 3.5″ intelligent IPS TFT display module includes graphics development software

EA Display Visions’ 3.5″ intelligent EA uniTFTs035-ATC display module is an all-in-one implementation of the display, microcontroller unit, and touchscreen. The module includes everything needed to directly control an application and expedite the development, prototyping, and deployment of an HMI/GUI. Design an HMI/GUI using the easy-to-use drag-and-drop uniTFT DESIGNER graphics development software and simple ASCII text-based instructions. Thanks to the integrated input/output and fast graphics controller, the display modules are ready to run without additional peripherals. They can be controlled via USB, SPI, I²C, and RS232. The IPS panels with all-angle color stability (AACS) technology keep contrast and colors stable even at oblique viewing angles. These displays are not subject to the inverse tilt effect that is inherent in the widely used TN displays. With a maximum brightness of more than 1,000 cd/m², they are readable even in direct sunlight or under bright surgical lights. The capacitive touch surface of the uniTFT recognizes multi-finger gestures and reacts reliably when used with thin gloves.

Contents

  • 3.5″ integrated capacitive touch intelligent display module
  • uniTFT DESIGNER (graphics software, download under Tools)

Features

  • 3.5″ IPS TFT 480×320
  • Included PCAP touch panel optically bonded
  • Free, easy-to-use uniTFT DESIGNER graphics development software
  • AACS-display (all-angle color stability, optimized backlight, and IPS TFT-panel over widest viewing angle)
  • Super-bright LED backlight over 800 cd/m²
  • Object-oriented screen layout
  • Change object during runtime: size, shape, color, and content
  • Animate and move objects
  • Alpha-blending
  • Single supply 3.3 V or directly through USB
  • Fonts: ASCII and Unicode
  • Serial interfaces: USB, RS232, SPI, and I²C
  • Eight digital, freely definable I/Os built-in, expandable up to 136
  • Four analog inputs
  • Time (RTC), battery-buffered
  • Flash memory as storage for pictures, fonts, menus, and log files
  • Internal functions for calculation as well as programmability
  • Speaker for tone feedback built-in
  • RoHS, REACH, and CE compliant
  • Temperature range: -20°C to +70°C
  • Waterproof mounting

more information: https://www.displayvisions.us

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