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DC Power Supply Sinks Current when Output is Turned Off

DC Power Supply Sinks Current when Output is Turned Off

When using a DC power supply for charging a load such as battery or capacitor, it is important to note that the DC power supply absorbs a current from such loads when the output is turned off. Here we are going to further explain this power supply’s behaviour; DC power supply, in general, comprises a bleeder circuit to discharge a power supply’s electrolytic capacitor at its output terminal. I...

DC Power Supply Sinks Current when Output is Turned Off

How to use the voltage correction function on frequency response

The PCR-WE can output up to 5 kHz, but it has frequency response as shown in the figure below. The response is about -3dB at 5kHz. For example, the waveform in the figure below is for 120 Vrms, 5 kHz. ...

DC Power Supply Sinks Current when Output is Turned Off

DC Electronic Load – Part 1: What is a DC Electronic Load?

Beginners who have never used an electronic load may well get confused with the difference between electronic loads and power supplies. They sometimes wonder ‘why the electronic load does not provide any output...?’ While similar in appearance, electronic loads are totally different from power supplies. It is not often you get to see them but it is suitable for specific applications such as w...

DC Power Supply Sinks Current when Output is Turned Off

Two Methods to Absorb Motor’s Regenerative Current Using Electronic Load

There are two methods to absorb motor’s regenerative current; Voltage Clipping Method and Bleeder Method. The following describes the characteristics, functions and precaution for the methods. Fig.1 illustrates the typical test system. 1...

DC Power Supply Sinks Current when Output is Turned Off

Choosing Electronic Load that Best Fits Your Switch Testing System

The switch on/off testing can be performed with a combination of DC power supply and electronic load (See Figure 1). To successfully conduct the testing, it is important to know that the current flow through the switch varies by the electronic load specifications or settings. Especially during the life testing, you should be aware that it may affect the lifetime of test switch. This white paper s...

DC Power Supply Sinks Current when Output is Turned Off

How to use the power line disturbance simulation function of PCR-WE

Voltage dips, short interruptions and voltage variations immunity tests of the IEC 61000-4-11 standard can be easily tested using the power line disturbance simulation function of PCR-WE. As an example, it explains how to set the voltage dip test. You can easily execute tests under the test conditions specified in the standard in a few steps. ...

DC Power Supply Sinks Current when Output is Turned Off

How Does Surge Suppression Work in PCR-LE/LE2 Series?

PCR-LE/LE2 Series feature the Surge Suppression function that involves the process of protecting PCR-LE/LE2 from voltage spike. You can choose Surge Suppression to turn on or off depending on your load condition. If you want to avoid any voltage overshooting or undershooting, always set Surge Suppression to on. However, when you use a load with regenerative feedback (e.g. capacitive load or batte...

DC Power Supply Sinks Current when Output is Turned Off

Necessity of Grounding Output Terminal for DC/AC Power Supply

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 ...

DC Power Supply Sinks Current when Output is Turned Off

How to Minimise Power Supply Noise in Test Systems

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 Power Supply Sinks Current when Output is Turned Off

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

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...

DC Power Supply Sinks Current when Output is Turned Off

What Makes a Good Power Supply?

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...

DC Power Supply Sinks Current when Output is Turned Off

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

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...

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