Path: EDN Asia >> Design Ideas
Communications/Network

Supporting telecom power supply during brownouts

22 Mar 2016 | Samuel Kerem

Learn how to use a charge pump so that the energy stored in a small capacitor can support the operation of a brick telecom power supply during brownouts.

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Design Ideas
  • Automotive
  • Communications/Network
  • Computing/Peripherals
  • Consumer Electronics
  • IC/Board/Systems Design
  • Industrial/Mil/Aero
  • Medical
  • Power/Smart Energy
  • Test & Measurement
Education & Training

• Use driver ICs smart thermal protection to extend LED lighting lifeNEW!
In this webinar, you will learn about the different ways to extend the lifetime of LED systems—from the basic to the very advanced methods…

• A system solution for high power SMPS
you will learn about: What is a system? SMPS design and typical requirements; Infineon's products for SMPS design; A demo for the highest SMPS efficiency…

Automotive

Voltage transient protection for switching regulators 15/04/2016
This circuit provides a highly cost-effective method for clamping an input voltage from a battery input with transients as high as 50V to take advantage of a 20V, 3MHz regulator.

Replacing master vibrator for Model T and TT Ford 12/02/2015
Here is a possible solution that does not require any permanent modification to the Model T. We cover some revisions to make the circuit easier to build and more efficient.

Repurposing switcher for HB-LED flashing beacon 11/08/2014
A classic, low-cost switcher IC is repurposed to flash a high-brightness LED in this minimal-parts-count design idea. The heart of the circuit is an MC34063 originally intended for DC-DC converters.

EMS testing with pulsed power supply device 01/07/2014
A smart hardware device can be retrofitted to any commercially available test-bench power supply module for testing engine management systems in critical power failure conditions.

Communications/Network

Simplifying software-defined radio with filter 26/04/2016
Find out how to use Linear Technology LTC1992 filter to replace four op amps in the signal chain of a software-defined radio.

Supporting telecom power supply during brownouts 22/03/2016
Learn how to use a charge pump so that the energy stored in a small capacitor can support the operation of a brick telecom power supply during brownouts.

IF output signal switch reduces noise in shortwave receivers 27/01/2014
This article describes how putting a signal switch in a mixer's IF output can serve as an effective noise suppression strategy for shortwave radio receivers.

LEDs light LAN-cable tester 01/03/2011
Cable and connector faults are relatively common in LANs. To test straight- or cross-link 10BaseT, 100BaseT, or gigabit UTP and STP cables.

Microcontroller drives DSEC motors 01/02/2011
Eutelsat defined the DSEC control protocol, which has been in existence since 1998. DSEC motors offer a resolution angle as high as 0.1 degrees. This makes them useful as low-cost alternatives to stepper motors.

Computing/Peripherals

How to control a dc motor using your PC 23/04/2015
In this article, we show how a circuit can be utilised to control the speed of a 5V permanent-magnet dc motor through the parallel port of a PC.

PSoC-based audio spectrum analyser using NeoPixels 16/09/2014
Due to constrained timing requirements, controlling a string of NeoPixels can be a little tricky. Fortunately, a UDB-based driver is available for use with Cypress Semiconductor's PSoC devices.

Water and vandal-proof keypad design 02/05/2014
Here's a clever and low-cost method to create a rugged UI.

Eliminating guesswork in 3D printer levelling 11/04/2014
The writer proposes a device that can be placed on the rails and used to measure the platform to print head height at each adjustment point in order to improve bed levelling for 3D printers.

One wire delivers power, data to LCD module 06/02/2014
Here's a cheap solution if you need to connect a small remote LCD display, or yourµC has run out of I/O pins.

Fabricating a high-resolution sensor-to-USB interface 03/01/2012
The design is based on a $8 microcontroller that features an 8051 architecture as well as a PGA (programmable-gain amplifier) and a 24bit sigma-delta ADC.

Consumer Electronics

Designing a home health care monitoring device 09/05/2016
Here is a case study on upgrading a health monitoring device used by patients who are managing their care at home.

The lowdown on LED strips 04/05/2016
The biggest problem the author found with the two LED strip types he evaluated is that the conductor resistance is simply too high. Read on to find out more.

Energising low-power devices wirelessly 27/04/2016
Here is a simple approach to wirelessly transmitting energy to low-power devices at distances as great as 10 cm.

Interfacing MIDI instruments to PC via USB port 29/03/2016
Find out how you can interface musical-instrument-digital-interface-equipped musical instruments to a PC via a USB port.

Creating illusions with primary colours 07/03/2016
When we watch TV, we seem to see a variety of colours. But those are really just a matrix of picture elements with green, red and blue trio of light emitting sources activated at varying intensities.

Forced quenching boosts three-transistor FM tuner 07/03/2016
It is quite impressive to have an FM tuner can be built using one transistor. This design idea is the luxury three-transistor version of that!

Boosting acoustic efficiency 05/01/2016
In this article, we show how to enhance what might be called the acoustic efficiency, which is a turn of phrase that may sound like a good thing, but it is NOT.

Designing electrochromatic circuits 24/12/2015
Here's a tutorial to get you started making your own electrochromatic circuit, which uses electricity to make something change colour.

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IC/Board/Systems Design

I2C interface features improved noise margin 20/05/2016
Find out how you can use optoisolators to galvanically isolate the slave devices on an I2C bus from the master device.

Testing reverse-recovery behaviour of diodes 19/05/2016
Testing the reverse-recovery time of diodes yourself proves beneficial because you cannot easily compare data sheets from different manufacturers.

Inverting sample-and-hold amp sans external resistors 18/05/2016
Eliminating external feedback resistors in an inverting sample-and-hold amplifier permits it to exploit the full bandwidth of its op amps.

Single IC forms low-cost inductance tester 18/05/2016
In this article, we show how to build a reliable, low-cost, and simple inductance tester. The basis for the tester is a Pierce buffered CMOS oscillator.

Arduino crosses over from hobbyists to professionals 16/05/2016
Every Arduino board and derivative has a standard hardware interface that allows custom designed electronics to be stacked on top of the processor board to yield the prototype of an embedded system.

Nonvolatile digital potentiometer gates logic signal 13/05/2016
Here is a simple alternative to a nonvolatile gating function you typically implement using programmable-array logic, gate-array logic, or a complex-programmable-logic device.

Swapping bits boosts performance of FPGA-PWM counter 12/05/2016
A simple change to the specification of an FPGA counter lowers the ripple of a PWM counter functioning as a DAC.

CPLD's internal oscillator does autocalibration 11/05/2016
Read about an autocalibration sequence that synchronises a CPLD's internal oscillator with an external crystal oscillator, enabling ±0.3% accuracy.

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Industrial/Mil/Aero

Relays get rid of high-voltage noise 12/05/2016
Here is a practical approach to reducing high-voltage-induced noise. A simple relay circuit cancels noise in the actuator stage of a scanning electron microscope.

Proportional power control for industrial apps 19/02/2016
In this design idea, we look into a pulsed current mirror made up of discrete transistors that drives LEDs from a low voltage, avoiding thermal runaway.

Precision temp-control with TEC Seebeck-voltage sampling 04/02/2016
Read about a thermoelectronic design that directly measures the heat flux through the TEC and then uses the measurement to better estimate and cancel the effects of thermal impedances.

MCU measures resistance without ADC 01/02/2016
In this article, we demonstrate how to configure the I/O ports of a microcontroller as an astable multi-vibrator so you can measure the resistance of a resistive sensor.

Self-resetting circuit breaker needs few parts 28/01/2016
Read about a circuit breaker that pulses power through a pass transistor when the current gets too high, thus protecting the part from excessive heat.

Enable bidirectional control for stepper motors 30/07/2015
Read about a circuit that lets you control bipolar stepper motors and run them in both rotations. It can be used in automatic devices and as an evaluation circuit for testing stepper motors.

MCU serial port measures pulse width 01/06/2015
The algorithm measures the duration between two consecutive rising edges. The microcontroller detects a rising edge or a falling edge when a received byte is neither 0xff nor 0x00.

MCU supervises 0- to 20-mA protection circuit 30/04/2015
Here's a look at a circuit that provides protection that is much faster than a fuse, wherein a microcontroller replaces fuses and trip circuits.

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Medical

Designing a home health care monitoring device 09/05/2016
Here is a case study on upgrading a health monitoring device used by patients who are managing their care at home.

Sudden impact wearable design wins Element14's first prize 11/08/2015
Cosmin Iorga's impact and injury reporting device measures EEG and ECG and reports it via GSM as needed. Iorga is the first-place winner of Element14's Sudden Impact design challenge.

How to generate rotating magnetic fields electronically 10/08/2015
Find out how you can use a microcontroller and a full-bridge driver to generate variable magnetic fields without mechanical elements.

Pulse oximetry design for wearable heart monitor 23/09/2014
Here's a simple design of pulse oximetry that can be used as a stand-alone device, with the ability of monitoring heart rate and oxygen saturation.

Inductive sensing for biomedical applications 01/07/2014
A left-handed antenna based biosensor has the advantages of real-time detection, small feature size, reduced sample volume, and minor environmental disturbance.

Inductive sensing for sleep posture analysis 27/06/2014
Embedding inductive coils under an off-the-shelf mattress pad creates a multi-point position and pressure sensing system for sleep-posture analysis.

Designing non-invasive blood glucose monitor 04/11/2013
Diabetics can bid goodbye to the finger-prick if we can create non-invasive glucometers as described here.

Power/Smart Energy

PSRR testing with analysers sans dc-bias ports 20/05/2016
Here's a technique that involves the use of an analyser that has no dc-bias port but that can characterise frequency response as low as 10 or even 1Hz.

Simple inrush-current limiter mitigates surges 19/05/2016
Read about an alternative circuit that effectively limits inrush current and does not add an extra source of heat to the power-supply package.

Cascaded converter enhances LED-drive capability 17/05/2016
Here's a look at a design idea that powers 24 white or ultraviolet LEDs in series at approximately 20 mA.

Voltage doubler uses push-pull dc/dc converter features 17/05/2016
Here is a minimal-parts-count, wide-range voltage doubler using the inherent voltage-doubling characteristics of a one-transformer push-pull dc/dc converter.

Dual transistor boosts current-sense circuit 16/05/2016
In this article, we demonstrate a two-transistor circuit that eliminates variation in output due to temperature.

Monitoring, balancing large lithium-ion batteries 16/05/2016
In this article, we provide one strategy for protecting and balancing large, high-voltage batteries.

WLED driver operates down to 1.2V supply voltage 13/05/2016
This circuit trumps commercially available LED drivers, which bottom out at 2.5V input voltage, by operating at voltages as low as 1V.

Relays get rid of high-voltage noise 12/05/2016
Here is a practical approach to reducing high-voltage-induced noise. A simple relay circuit cancels noise in the actuator stage of a scanning electron microscope.

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Test & Measurement

PSRR testing with analysers sans dc-bias ports 20/05/2016
Here's a technique that involves the use of an analyser that has no dc-bias port but that can characterise frequency response as low as 10 or even 1Hz.

Single IC forms low-cost inductance tester 18/05/2016
In this article, we show how to build a reliable, low-cost, and simple inductance tester. The basis for the tester is a Pierce buffered CMOS oscillator.

CPLD's internal oscillator does autocalibration 11/05/2016
Read about an autocalibration sequence that synchronises a CPLD's internal oscillator with an external crystal oscillator, enabling ±0.3% accuracy.

Circuits guard outputs against over-voltage 04/05/2016
Find out how to add a solid-state relay and control circuitry to an amplifier's output to provide over-voltage protection.

Low-cost way to measure motor speed 29/04/2016
In this article, we present a microcontroller-based circuit that provides both an LCD readout and an analogue motor-speed output.

Mixed-signal-THD analyser for power-line distortion 28/04/2016
To measure this distortion, you can use a mixed-signal-THD analyser to monitor the fundamental frequency amplitude and the second-, third-, fourth-, and fifth-harmonic content of the input signal.

Thermoelectric-cooler unipolar drive achieves stable temp 26/04/2016
Peltier devices can both heat and cool, depending on the direction of current flow. This article shows an implementation of the concept in a high-performance PID-feedback loop.

Nulling out background illumination 25/04/2016
In optical spectroscopy, a correct intensity measurement of the probe beam is crucial during material characterisation.

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Tech Impact

Regional Roundup
Control this smart glass with the blink of an eye
K-Glass 2 detects users' eye movements to point the cursor to recognise computer icons or objects in the Internet, and uses winks for commands. The researchers call this interface the "i-Mouse."

GlobalFoundries extends grants to Singapore students
ARM, Tencent Games team up to improve mobile gaming


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