Protect your device againist high power blog

Protect Your Device Against High Power

Published: 2nd March 2022

Introduction

Electronic devices are increasingly power-hungry. Consumers are demanding more functionality and features from everyday electronics. To meet this demand, engineers build devices that do more than ever before. These devices consume more power to fuel the new capabilities. Overvoltage (OV) and overcurrent (OC) are important security features in power supplies. Using these features lets you protect the device under test (DUT) from a higher voltage than the DUT’s design was meant to handle.

As the power capabilities of devices increase, the power required in test environments must also increase. You are likely to need a higher power in your DC power supplies for a wide variety of high-power test applications such as high-power DC-to-DC converters, batteries, uninterruptible power supplies, electric vehicles, and more.

Extra care is necessary when working with devices that use higher power, are reactive, or simply store energy. These devices are notorious for damaging themselves and the surrounding equipment. Fortunately, modern bench power supplies can protect against this damage.

Overvoltage and overcurrent protection

When working with high power, choosing a DC power supply that can protect the DUT when the voltage or current level exceeds a certain safety threshold is important. When the output exceeds a specific voltage or current level, the power supply must be able to recognize this event and properly disable the output. Overvoltage and overcurrent protection are two common features that can do this. It is critical to use these two features when working with high power. Overvoltage protects the device under test when the power supply exceeds the preset voltage limit. You can determine this preset voltage and program it on the front panel. When the power supply’s output exceeds the preset voltage limit, it disables the output, and an overvoltage indicator will appear. By default, overvoltage protection is typically always on unless specified otherwise. By default, most power supplies ship in that state from the factory. Make sure to set and turn on your overvoltage protection limit as a safety feature in your test setup.

Power supplies also have an overcurrent protection feature that works in a similar manner. Instead of monitoring voltage, overcurrent protection monitors the current that flows out of a power supply and disables the output if the current exceeds a certain present threshold. It does this in a slightly different way than that of overvoltage protection.

The preset over-current protection limit is the current limit setting itself. Once the current flowing through a power supply reaches the current limit setting, it enters into a constant current operating mode. The voltage usually goes down in constant current mode, and the current remains at the current limit setting. If
overcurrent protection is enabled; it will shut down the output to prevent too much current from flowing out. Typically, overcurrent protection is always off by default, and it is in that state when shipped from the factory. When necessary, use the overcurrent protection feature to safeguard your setup.

Protect Your Device Against Overpower

Overvoltage and overcurrent protection works well for protecting a device that has a single maximum voltage and current — some devices’ maximum current changes with the voltage. An example is a DC-to-DC converter, as its input can accept a range of voltages, and it provides a regulated voltage output. Every DC-to-DC converter has a maximum power rating. An increase in voltage will cause the max current to decrease. For example, take a 12 V to 19 V / 2 A converter that can handle a 9 V to 18 V input.

A power supply can test the input 9 V to 18 V, but the maximum current limit needs to be set independently for each voltage step, A current acceptable with a 9 V input would be damaging at 17 V, so the current limit needs to vary with the input voltage, as shown in Table 1. The max input power is set at 50 W to handle the inefficiencies and transient currents.

Table 1. Reducing the maximum current as voltage increases protects the converter from overpowering

Power supplies, like the Keysight E36200 Series autoranging power supply, support output LISTs. Output LISTs enable you to vary the output with a series of steps. Each step defines a voltage-current combination along with a dwell time and synchronizing triggers. A dwell time holds each step for the specified period before advancing to the next step.

With the power supply powering the converter in our example above, the output of the converter powers a 19 V, 2 A load.

Figure 2. An output LIST is a series of steps with an individual voltage, current, and dwell time

The power supply measures the actual voltage and current for each step and logs it. To characterize your device, multiply the actual voltage and current values and see how the power consumption changes. For this DC-to-DC converter, the input power is 44.8 W with an 8 V input, and 43.3 W with an 18 V input. We now have an accurate picture of our convertor’s performance. LIST mode is useful for setting a series of voltage-current combinations and protecting a device from overpower.

Summary

Testing in a high-power environment introduces a set of new challenges. Overvoltage and overcurrent protection are important features for power supplies. It can protect your DUT from a voltage higher than the design was meant to handle. When it comes to power supplies, choose one with the necessary capabilities and safety features to meet your testing needs.

MCS Test are an approved UK partner for Keysight
Content Source: Protect Your Device Against High Power | Keysight Blogs

category.title

Keysight E36231A 200W Autoranging Power Supply, 30V, 20A

200W, 1 Channel DC Power Supply

The E36200 series consists of two 200 W single output power supplies and two 400 W dual output power supplies. Autoranging technology provides the highest current available at all output voltage. Power devices with up to 40A (E36233A) or voltage up to 120V (E36234A) using auto-parallel or auto-series to internally connect the two outputs into a single output with twice the power. A single output supply can power devices requiring up to 200W. A dual supply provides two independent 200W channels.

Find out more about Keysight E36231A 200W Autoranging Power Supply, 30V, 20A
category.title

Keysight E36232A 200W Autoranging Power Supply, 60V, 10A

DC power supply, single-output, auto-range

The E36200 series consists of two 200 W single output power supplies and two 400 W dual output power supplies. Autoranging technology provides the highest current available at all output voltage. Power devices with up to 40A (E36233A) or voltage up to 120V (E36234A) using auto-parallel or auto-series to internally connect the two outputs into a single output with twice the power. A single output supply can power devices requiring up to 200W. A dual supply provides two independent 200W channels.

Find out more about Keysight E36232A 200W Autoranging Power Supply, 60V, 10A
category.title

Keysight E36233A 400W Autoranging Dual Output Power Supply, 30V, 20A

Free Keysight U1733C Handheld LCR Meter when you purchase this product!

The E36200 series consists of two 200 W single output power supplies and two 400 W dual output power supplies. Autoranging technology provides the highest current available at all output voltage.

Find out more about Keysight E36233A 400W Autoranging Dual Output Power Supply, 30V, 20A
category.title

Keysight E36234A 400W Autoranging Dual Output Power Supply, 60V, 10A

Free Keysight U1733C Handheld LCR Meter when you purchase this product!

The E36200 series consists of two 200 W single output power supplies and two 400 W dual output power supplies. Autoranging technology provides the highest current available at all output voltage.

Find out more about Keysight E36234A 400W Autoranging Dual Output Power Supply, 60V, 10A

You Might also like

Wi Fi 6 E Matters What Is Contention Based Protocol Test

Wi-Fi 6E Matters: What Is Contention-Based Protocol Test?

Every wireless device must obtain approval from the Federal Communications Commission (FCC) before it can be launched in the U.S. and many other countries around the world that follow the FCC.

Read more
The I2 S Protocol and Why Digital Audio is Everywhere

The I2S Protocol and Why Digital Audio is Everywhere

When digital audio was first introduced in the 1970s, it was regarded with suspicion and dismissed as sterile and lifeless. Even today, audiophiles swear by purely analog systems, despite the technical advantages of digital audio quality.

Read more
Guidelines to Redeem and Activate your Path Wave Bench Vue Software License

Guidelines to Redeem and Activate your PathWave BenchVue Software License

PathWave BenchVue software gives you the capability to easily control your instruments and perform in-depth analysis on your measurements. Besides that, the PathWave BenchVue software apps supports more than 700 Keysight Instruments and are continually expanding.

Read more

Sign up for the MCS Newsletter

You will receive all the latest test & measurement news and rental offers.