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Archive for 2021

Necessity of Grounding Output Terminal for DC/AC Power Supply

Posted on: June 23rd, 2021 by Doug Lovell
Necessity of Grounding Output Terminal for DC/AC Power Supply 23/06/2021
Power supply has the following three output terminals: - DC power supply: Positive/negative terminals and Ground (GND) terminal - AC power supply: L/N terminals and GND terminal. Upon using both power supplies, it is necessary to determine whether either of positive or negative terminals or L/N terminals is connected to the GND terminal. As our factory default; - DC power supply: Depending on ...

How to Minimise Power Supply Noise in Test Systems

Posted on: June 23rd, 2021 by Doug Lovell
How to Minimise Power Supply Noise in Test Systems 23/06/2021
Noise is an unwanted but inevitable problem in test systems including power supply sources, except batteries, which are low-noise power sources. Some amount of noise is always generated or relayed by power supplies; however, a power supply is a device that supplies power to another device, and not intended to be used by itself. Power supply noise should be low enough so as not to interfere with th...

DC Electronic Load – Part 2: Basic Operation Mode and Principle (1)

Posted on: June 23rd, 2021 by Doug Lovell
DC Electronic Load – Part 2: Basic Operation Mode and Principle (1) 23/06/2021
As described in Part 1, electronic loads can act as a variable resistor and regulate a current depending on your applications. With this function, electronic loads can be used as substitute for high-power components. To fulfill this function and test DUTs effectively, there are four operation modes for electronic loads: 1) constant current 2) constant resistance 3) constant voltage and 4) constant...

What Makes a Good Power Supply?

Posted on: June 23rd, 2021 by Doug Lovell
What Makes a Good Power Supply? 23/06/2021
DC or AC regulated power supplies (hereinafter called ‘power supply’) can be classified into eight types and four categories in accordance with the output source (DC or AC), output range, polarity or circuit method as shown in Table 1. In this...

What It Takes to Keep Regulated DC Power Supply Stable Part 2: Load Conditions

Posted on: June 23rd, 2021 by Doug Lovell
What It Takes to Keep Regulated DC Power Supply Stable Part 2: Load Conditions 23/06/2021
Basically, a regulated DC power supply (referred as DC power supply) is an electrical device that provides a constant output voltage; however, sometimes it cannot remain stable. There might be some factors that affect the stability of the DC power supply, and Part 1 previously focused on one of them: how you connect cables on a system. Here in Part 2, we look at one other important factor that nee...

How to Select a Right DC Power Supply Part 2: Key Considerations

Posted on: June 23rd, 2021 by Doug Lovell
How to Select a Right DC Power Supply Part 2: Key Considerations 23/06/2021
Welcome back to Part 2 of this series! Part 1 is all about the functions and characteristics of DC power supplies. In Part 2 here, we will take a look at the considerations when selecting a right power supply. 1. Key Considerations There are too many considerations when selecting a DC power supply. This makes it hard to select a right power supply without any understanding, whic...

Voltage Interruption Waveforms Provided by PCR-LE Series

Posted on: June 23rd, 2021 by Doug Lovell
Voltage Interruption Waveforms Provided by PCR-LE Series 23/06/2021
In an AC circuit, power supply interruption can be mainly divided into two types: it occurs with low impedance or with high impedance. The power supply interruption with low impedance is a short-circuit interruption. A short circuit is an unintended path to flow a current with typically very low impedance. Whereas, the power supply interruption with high impedance is an open-circuit interruption....

How to Reduce Power Supply Noise

Posted on: June 23rd, 2021 by Doug Lovell
How to Reduce Power Supply Noise 23/06/2021
In a test system, AC power supply is one of the significant components that can create test sequences for output and supply source to DUT. However, the power supply may cause a noise issue during test. There is some noise interference such as conducted noise and magnetic field that may enter into the test system. This article focuses on a noise terminal voltage at an input and output terminal whi...

DC Electronic Load – Part 6: Application and Example (2)

Posted on: June 23rd, 2021 by Doug Lovell
DC Electronic Load – Part 6: Application and Example (2) 23/06/2021
Continuing from the previous white paper, here are three more effective applications and examples of electronic loads. 6-1. Applying the Load to a Motor Figure 6-1 shows a block diagram illustrating an example of the DC motor test system. In this system, the test motor (DUT) is driven by the DC power supply. The coupling is connected to the DUT and another motor in order to app...

Single-phase Three-wire Output from One AC Power Supply

Posted on: June 23rd, 2021 by Doug Lovell
Single-phase Three-wire Output from One AC Power Supply 23/06/2021
A single-phase three-wire output can be achieved usually by connecting two AC power supplies. However, if you need to output from one AC power supply and the required current through DUT is small, you can output it by configuring the following circuit. 1. Single-phase Three-wire System In the figure below, R1=R2. Appropriate resistance for power supply should be applied on R1 an...

What It Takes to Keep Regulated DC Power Supply Stable Part 1: Connecting Cable

Posted on: June 23rd, 2021 by Doug Lovell
What It Takes to Keep Regulated DC Power Supply Stable Part 1: Connecting Cable 23/06/2021
A regulated DC power supply (referred as DC power supply) is an electrical device to convert AC into a constant DC. Its function is to maintain a constant output voltage, however, unfortunately even if you use an intelligent DC power supply, improper wiring can mess up a whole system operation or performance. In this white paper, we explain the best practices for connecting a power cable and load...

Switching Function Improvement in PLZ5W Series

Posted on: June 23rd, 2021 by Doug Lovell
23/06/2021
PLZ5W Series features a switching current function to repetitively fluctuate between two current levels, and this function has been improved as compared with the previous model of PLZ4W Series for the following characteristics: 1) Switching speed 2) Switching waveform quality * In PLZ4W Series, the switching speed tends to become slow when connecting a resistance load. Here you will find th...

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