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Look For These Features To Avoid Damaging Your Power Supply

Look For These Features To Avoid Damaging Your Power Supply

Many of today’s power components come equipped with built-in protection features that will turn the device off when fault conditions occur. They can also include remote status signals that alert users to certain operating conditions or functions that may require adjustment or regulation. This blog post provides a summary of some of the most common built-in protections and status signals found in power components:

  • Overtemperature Protection. When internal components heat a DC/DC converter beyond a set temperature, this control shuts the converter down to protect both the converter and downstream components against failure.
  • Short Circuit Protection. This feature monitors the output power rails and shuts off the output power when a short circuit occurs.
  • Power Fail. A signal that indicates a loss of main input power or a drop in voltage below a threshold where the power supply will not provide adequate power. The converter will continue to operate for a few milliseconds to store data or to allow the system’s backup power to take over before shutdown.
  • Power Good. As a system powers up, the Power Good feature will prevent the system from operating until a set output voltage is achieved. This thwarts any potential damage that can happen when running at an improper voltage.
  • Inhibit and Enable. There may be times when the user needs to take action to turn the output voltage on or off without using a relay. Specifically, Inhibit induces the user to turn off the output voltage, while Enable means the user must turn on the output voltage.
  • Remote ON/OFF. Many devices require the DC/DC converter to be enabled or disabled intermittently, such as components that run on standby power. This function can also turn the converter off to protect against damaging inrush currents. The way you implement remote ON/OFF will vary depending on the converter and its logic. This blog post provides more information about remote ON/OFF including the types of logic involved.

AC/DC Power Supplies Offer Monitoring and Built-in Protection Features

You can find some of these monitoring and protection features in our new UIA600 AC/DC switching power supply. This 600-W unit offers input voltage ranges of 90 to 264V AC or 120 to 370V AC. It also includes a 12V DC output voltage, power factor of >0.95 and efficiency up to 93 percent. The power supply’s Power Good output voltage range is from 3.7 to ~7.5V, and the device turns off from 0 to ~1V output voltage. It also offers remote control protection, configured as +RC / -RC: Power ON=open; Power OFF=short.

Additional built-in safeguards include overtemperature, overload and short circuit protection, and each activates the auto-recovery feature when the condition is resolved. The UIA600 also features a current share function to provide more current to power a load while using a constant voltage.

Get Started Today

To make sure your power supply doesn’t suffer harm from adverse conditions, remember to look over the manufacturer’s datasheet for built-in protections and status signals. With the right adjustments and regulation, both the power supply and downstream components can avoid damage. Our UIA600 AC/DC switching power supply offers many of these protective features, along with a current-sharing function for parallel connections. Our engineers are ready to assist you in selecting the best switching power supply for your application.

For more information about Daburn Electronics’ Polytron Devices UIA600 AC/DC switching power supplies, download our datasheet.

Protect Your SMD Power Product From Damaging Moisture

Protect Your SMD Power Product From Damaging Moisture

When it comes to mounting components to circuit boards, surface mount technology saves board space and assembly time. Advantages include higher component density, resulting in smaller circuits and faster circuit speeds, plus shock and vibration resistance, and low noise. Because of these and other benefits, surface mount-packaged (SMD) components are a logical choice for automated assembly. However moisture can cause a “popcorn effect” during solder reflow.

In order to help OEMs take proper care when handling and storing moisture-sensitive devices, the Association Connecting Electronic Industries created the IPC-M-109 Moisture-sensitive Component Standards and Guideline Manual. Among its seven documents, IPC-M-109 defines moisture sensitivity levels (MSLs), with each numerical level corresponding to the part’s risk of incurring the popcorn effect: Level 1 is the lowest risk, and Level 6 indicates the highest risk. Each level determines how long a moisture-sensitive device can be exposed to ambient room conditions (≤30°C and 85 percent relative humidity at Level 1; all other levels: ≤30°C and 60 percent relative humidity).

Find out the Product’s Floor Life

Many vendors list MSL information under the “Environmental” section of the datasheet. For example, the datasheet for Daburn Electronics' Polytron Devices MTWA4 Series of 3.5-watt DC-DC converters for medical applications indicates they are available in a 0.95 x 0.57 x 0.40-inch miniature SMD package and carry an MSL level of 2. That means it can be stored, mounted and reflowed within one year of “floor life” outside of a moisture barrier bag at less than or equal to 30°C and 60 percent relative humidity. Should the part exceed its floor life, that moisture will have to be baked out, slowly, before assembly. In addition to their miniature size, the MTWA4 converters provide 5,000 Vac input to output 2 MOPP isolation and remote ON/OFF. Their voltage input range (4.5 to 12V DC) makes them well-suited for portable devices. The MTWA4 Series of SMD-packaged DC-DC converters is well-suited for automated assembly and can satisfy various input and output requirements.

When using a surface mount component in your design, manufacturability and reliability depend on proper storage. Be sure to check the manufacturer’s datasheet for the part’s numerical moisture sensitivity level (MSL) in order to determine its floor life, and to refer to IPC J-STD-020 and J-STD-033 for other storage and handling procedures based on the MSL. The better informed you are about moisture levels according to JEDEC/IPC standards, you’ll have more certainty that your part will perform as intended.

To learn more, get in touch with our technical staff.

Save Time and Effort With Custom Linear AC/DC Power Supplies

Save Time and Effort With Custom Linear AC/DC Power Supplies

If you need a custom AC/DC power supply that offers low noise and ripple, simplicity, reliability and economy, chances are the ever-popular switching power supply won’t satisfy all your needs — especially when it comes to low noise. Thankfully, there are still power supply manufacturers that can provide an AC/DC linear power supply that can satisfy requirements for industrial, medical and other critical low noise applications.

Manufacturers typically focus their efforts on switching power supplies, so finding a vendor that offers custom linear supplies can be a challenge. The Polytron Devices Division of Daburn Electronics is one of a few suppliers that are committed to customizing linear power supplies. When specifying a custom AC/DC linear power supply, these are the factors to look for in a vendor:

  • A solid legacy of producing AC/DC linear power supplies
  • A commitment to AC/DC linear power supplies
  • The ability to satisfy high power requirements
  • The ability to provide many types of modifications to linear power supplies
  • Engineering expertise
  • Volume advantages to keep costs low

How We Can Tailor a Linear Supply To Your Needs

As other manufacturers de-emphasize or even phase out linear power supplies, we're building on the legacy of our P3 and P5 Series low noise, precision linear power supplies — continuously available since 1969 — by expanding customization capabilities and upgrading our original designs for medical applications.

At Polytron Devices, we're well-known for low-noise medical and industrial linear power supplies. We can satisfy a wide range of custom needs such as:

  • Providing multiple output voltages in a single model
  • Adding programmability or ON/OFF switches
  • Adding a variety of types such as open frame, desktop and wall plug-in models, in addition to enclosed units for harsh environments

We have also upgraded our power capability. Our previous offering had a range of 1 to 30 watts, maximum, while our latest supplies now cover 1 to 450 watts, maximum. Our engineering staff is available to assist you throughout the process. Simply send us your tech specs and we’ll suggest solutions for your unique requirements, create evaluation samples, safety-test the unit and help ensure regulatory approvals for IT equipment and medical equipment.

We’ll also work to get your custom unit to you when you need it while keeping costs in check. For example, transformers are the most expensive part of the linear power supply. But thanks to our strong relationships with transformer manufacturers, we have access to large quantities of transformers to get them fast and cost-effectively. We also accommodate blanket orders so you can lock in quantity pricing while receiving your product as you need it.

Saving You Time and Effort

Because most power supply manufacturers focus on switching-type supplies, specifying a custom linear AC/DC power supply has become a challenge for designers. We can meet your linear power supply needs with custom units tailored to your application. When you work with our engineers and sales support team, you’ll save time, effort and money so you can get your product to market faster.

For more information about our custom linear AC/DC power supplies, contact us.

What You Should Know About the New IEC 62368-1 Safety Standard

What You Should Know About the New IEC 62368-1 Safety Standard

Technology is all about change, and the design standards for IT and AV equipment are changing with the times as well. IT and AV devices share many similarities, so the International Electrotechnical Commission replaced its longstanding IEC 60950-1 IT equipment safety standard and IEC 60065 AV standard with the new IEC 62368-1 safety standard.

This single standard is a dramatic shift in compliance requirements for IT and AV equipment designers. Here’s a brief overview of just some of the many facets of IEC 62368-1:

  • It’s a hazard-based standard. IEC 62368-1 is a hazard-based, rather than a prescriptive, approach to compliance, with an emphasis on protecting users who come into contact with equipment during operation, installation or maintenance. OEMs must identify potential sources of injury and safeguards that can reduce the likelihood of pain, injury, fire and other incidents.
  • The focus extends beyond products. Not only does IEC 62368-1 cover IT and AV products, but it also covers components and subsystems. Designers purchasing power supplies, components built into equipment or standalone power supplies and adapters should verify the products comply with IEC 62368-1.
  • It has future energy sources in mind. As technology advances, so do energy sources. That’s why IEC 62368-1 requires engineers to identify energy sources and label them as Class 1, 2 or 3 based on a source’s effect on the body, as well as its effect on combustible materials. Engineers must also identify the existing safeguards for each energy source and determine their efficacy.
  • IEC 62368-1 has arrived. IEC 62368-1 superseded IEC 60950‐1 and IEC 60065 on December 20, 2020. Going forward, OEMs have to certify that their new IT and AV equipment satisfies the IEC/UL 62368 standard in order to access major markets.

IEC 62368-1-Compliant DC/DC Converters for Railway Applications

The Polytron Devices division of Daburn Electronics is committed to helping OEMs ensure compliance, starting with a new line of 200-watt DC/DC converters. The HWC200 Series half-brick DC/DC converter offers a 10:1 ultra wide input range to accommodate a broad range of power systems typically found in railway environments. Other features include:

  • A hold-up function
  • 3,000V AC reinforced insulation
  • Primary pulse output
  • Remote ON/OFF
  • Over voltage, over current, short-circuit and over temperature protection

The 10:1 ultra wide input makes the HWC200 well-suited for railway applications because it can accommodate a broad range of power systems. In addition to meeting IEC/UL/EN 62368-1, this RoHS and REACH-compliant DC/DC converter carries the CE mark and meets EN50155 and EN45545-2 standards for railways, as well as EN55032 and EN50121-3-2 for EMC in railway environments.

Meet the Latest Global Safety Standards

When selecting DC/DC converters for new IT and AV equipment, make sure they meet the latest global safety standards. Our HWC200 Series DC/DC converters are IEC/UL/EN 62368-1 certified and also satisfy various railway standards. And, we can furnish the applicable documentation upon request.

For more information about the HWC Series of IEC 62368-1-compliant DC/DC converters, visit our product page.

Constant Current, Constant Voltage DC/DC Converters Prevent Component Damage

Constant Current/Constant Voltage DC/DC Converters Prevent Component Damage

While many DC/DC converters maintain a constant voltage output, some devices in a design may instead call for steady current. For instance, LEDs require a constant current to prevent burn out. Other components that operate from a constant current include batteries and supercapacitors. Here are the things you need to know about DC/DC converters that provide both constant current and constant voltage (CC/CV) regulation.

DC/DC converters with a constant current mode use a resistor and feedback loop to deliver a steady output current which is unaffected by load variations. Similarly, a constant voltage mode uses a control loop to provide steady voltage output even when load resistance varies.

Ensure Steady Power for Railway Applications

Polytron Devices’ FWB(D) Series of DC/DC converters for railway applications offers constant current and constant voltage capabilities to ensure steady power delivery. The 150W devices can operate at up to 200W with 20 percent output voltage adjustability, and the output current can operate 1.1 times and above when in CC mode. It also provides hiccup protection mode to facilitate recovery from an overcurrent condition if the output resistance is short.

The FWB(D) Series comes in a 3.68 by 2.07 by 0.067-inch wall mount package and accepts 4:1 wide input voltages of 9-36, 18-75 and 43-160V DC and provides adjustable output voltage from 12 to 48V DC with no minimum load required. In addition to offering constant current and constant voltage modes, the series also features:

  • High efficiency up to 89 percent.
  • Built-in EN55011 and EN55022 Class A filter.
  • Input to output isolation: 2,250V DC.
  • Six-sided continuous shield.
  • UL60950-1, EN60950-1, IEC60950-1 and EN50155 approvals.
  • CE Marked.
  • RoHS and REACH compliance.

Achieve Optimal Operation and Reliability

Constant current/constant voltage DC/DC converters can provide steady voltage if needed or can vary that voltage to guard against high currents, depending on your application. Polytron Devices’ FWB(D) Series DC/DC converters combine voltage and current regulation with exceptional power conversion characteristics so the components you use in your railway applications can operate with optimum performance and reliability.

For more information about Polytron Devices’ FWB(D) Series constant voltage/constant current DC/DC converters, visit our product page.

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