The electronic load verifying the LED driver not only has the functions of a general electronic load (CC, CR, CV, CP), but also must be able to simulate the load characteristics of the LED, set the forward bias (Vd) and the on-resistance ( Rd), etc. In addition, the built-in dimming control signal output is convenient for the PWM dimming test of the LED driver.

The dedicated electronic loads that GW Instek supports for LED driver testing are as follows:

• Must be installed on  3302G mainframe [single channel], 3305G [two channels] or 3300G [four channels], and the mainframe has 150 sets of store/recall memory
• 341G LED DC Electronic Load Simulator 300V, 24A, 300W
• 3342G LED DC Electronic Load Simulator 500V, 12A, 300W
• 3343G LED DC Electronic Load Simulator 500V, 24A, 300W
• 3345G LED DC Electronic Load Simulator 120V, 4A, 150W
• 3346G LED DC Electronic Load Simulator 120V, 12A, 300W
• 33401G LED DC Electronic Load Simulator 500V, 6A, 150W*2
• 33402G LED DC Electronic Load Simulator 120V, 2A, 75Wx2
• 33403G LED DC Electronic Load Simulator 120V, 6A, 150Wx2

• The power input dimming frequency of 3345G & 33402G can reach 25KHz, which is the fastest and widest bandwidth electronic load in the market
• The dimming control output of 3345G & 33402G is DC~10KHz (other models are DC~1kHz)

Single phase 220V (B type)

3kW model

Terminal rated voltage and current: 400V, 41A

Locking screw: M4

Locking terminal restrictions: inner diameter greater than 4mm, outer diameter less than 9mm

Part No.: 39BT-00301301 (BLOCK TERMINAL 0168-2303, 300V, 30A ,3P ,RoHS)

4.5kW, 6kW models

Terminal rated voltage and current: 1000V, 76A

Locking screw: M5

Locking terminal restrictions: inner diameter greater than 5mm, outer diameter less than 13mm

Part No.: 39BT-00301401 (BLOCK TERMINAL 0168-4103,600V,115A ,3P ,RoHS)

Three-phase 220V (C type)

4.5W, 6kW models

Terminal rated voltage and current: 1000V, 76A

Locking screw: M5

Locking terminal restrictions: inner diameter greater than 5mm, outer diameter less than 13mm

Part No: 39BT-00401501 (BLOCK TERMINAL 0168-4104, 600V, 115A ,4P ,RoHS)

Three-phase 400V (D type)

4.5W, 6kW models

Terminal rated voltage and current: 1000V, 76A

Locking screw: M5

Locking terminal restrictions: inner diameter greater than 5mm, outer diameter less than 13mm

Part No.: 39BT-00500701 (BLOCK TERMINAL 0168-4105, 600V, 115A ,5P ,RoHS)

For other details, please refer to the link below:

https://paper.dropbox.com/doc/PSU-3KW6KW-AC-input-terminal-specification-rfm3pTQd7P6jo3BDIYBi0

The measurement function of the ASR series AC/DC power supply can be performed through the free software to perform data logging (Data Logger)

The software diagram is as follows

Figure 1 Data logging of ASR measurement parameters

Figure 2 Harmonic data logging

For free software, please click the link below, file download option, registered members can download for free after login

https://www.gwinstek.com/en-global/products/detail/ASR-3000

Fan is a component that ensures heat dissipation and ensures the normal operation of the power supply.

The PSU series power supply will stop output when there is a fan fail message.

When the fan is in the critical state of failure, the phenomenon of good and bad sometimes causes the failure prompt of Fan Fail indicator to flash.

When your power supply keeps showing Fan Fail prompt, please contact your nearest GW Instek Service Center services@goodwill.com.tw 

Routine maintenance precautions:

1. Avoid dust accumulation in the fan
2. There is a certain cooling distance between the fan and the desktop or wall

The power supply over-voltage protection (OVP) is designed as a DUT protection mechanism to avoid supplying excessive voltage to the device under test (DUT) or circuit under test (DUC).

Three possible overvoltage (OVP) scenarios are provided below.

Scenario 1: Users forget that the overvoltage protection was set for the last project, and the voltage of this test project is higher than the overvoltage protection setting value.

For example: the OVP of the last project was set to 12.5V, the required voltage of this project is 15V, and the set output voltage is higher than the 12.5V of the overvoltage protection, so the power supply starts the protection mechanism to stop the output.

Scenario 2: After connecting the remote compensation, the output of the power supply is higher than the overvoltage protection setting value due to compensation

For example: the working voltage of the circuit is 12V, and the overvoltage protection is set to 12.5V. Due to the excessive loss from wiring, a voltage drop of 0.6V is caused on the wiring, resulting in only 11.4V voltage of the DUT. The power supply starts to compensate, and the compensation reaches 12.5V, the DUT is 11.9V, and the overvoltage setting value of 12.5V is exceeded after compensation, so the power supply starts the protection mechanism to stop the output.

Scenario 3: Due to the inductance of the test lead, at the moment of the power supply switching or the moment of the programmable voltage change, the stray components on the lead cause LC resonance, and the transient voltage during the voltage change exceeds the OVP protection voltage setting value.

For the APS-7000 series, single step time of Sequence or Simulation is 3600 seconds (1 hour).

If your application requires a sequence or a simulation step time of more than 1 hour, you can use the Jump function to achieve it.

In addition to installing the driver for the APS-1102A, your computer must also have NI-VISA installed.

Mission Critical applications such as communication equipment rooms (such as 4G, 5G base stations) and data centers (IDC) will have a great impact due to power failure. Therefore, such constructions will have emergency power supplies such as UPS. In order to save energy, these data centers also desire to directly use regenerative energy or the DC voltage of the UPS to reduce the consumption of the conversion.

Therefore, in addition to AC input, the current power supply also supports 48V DC input LVDC and 180~400V DC input HVDC. When testing this type of power supply, the conventional AC power supply does not have the DC mode, so it is difficult to perform the test.

GW Instek ASR-2000 series and ASR-3000 series AC/DC power supplies are instruments developed for the above applications.

Precautions for purchasing AC and DC power supply:

1. Whether the DC power is the same as the AC power (commonly known as the DC full power): The DC output power of most products is only 80% of the AC output power, and there are even 50% of the AC output power. GW Instek ASR-2000 and ASR-3000 are designed for full power without reduction.
   
   

2. Whether it can be seamlessly converted from AC output to DC output: Most AC/ DC power supplies turn off AC and then turn on DC, so there will be a power outage at the moment of conversion. GW Instek ASR-2000 and ASR-3000 are seamless transition designs.

Connecting the power supply to the device under test (DUT or DUC) requires an additional test lead, and the resistance of the test lead will cause a slight voltage drop, so that the DUT cannot get the expected output voltage. In order to improve this problem, the power supply is designed with the function of Remote Sense. The remote sense function senses the actual voltage value received by the DUT through the additional wiring of S+ and S-.

Take the 3.3V output as an example, because the voltage drop of the wire, there is only 3.2V left on the circuit under test. Through the report of the remote sense, the power supply will increase the output until the voltage reported by the remote sense is 3.3V, this design can eliminate the voltage drop of the wire.

Precautions on using Remote Sense:

1. Remote Sense cannot be disconnected. Once the remote sense is disconnected, if it reports that there is no voltage at the DUT, the power supply will continuously increase the output to compensate. The remote sense still reports no voltage due to disconnection, and the power supply will increase the voltage again, which may lead to circuit overvoltage and burn. In order to avoid this problem, the remote sense design of many power supplies of GW Instek has the design of compensation upper limit.
   
   
2. If the output of the power supply uses an external switch to connect to the DUT, take a precaution on the wiring of the remote sense.

Test fuses and circuit breakers need transient current to test whether the operation is normal.

It is a design issue when it does not disconnect as the function  

It is a quality issue when it does not connect as the function

GW Instek electronic loads with the Turbo mode can help users to verify these two issues at the most appropriate cost.

Turbo mode can provide double the rated current or power in a short time (1 second).

Electronic loads with the Turbo mode include:

AEL-5000系列GW Instek brand: The AEL-5000 series

3310G系列，3350G系列，3270系列，3282系列Prodigit brand: the 3310G series, the 3350G series, the 3270 series, the 3282 series

Other applications of Turbo mode: Short circuit of AC power supply, OCP, OPP test

The basic element of an electronic load is a MOSFET, which is a voltage-controlled variable resistor.

The electronic load is an important device for testing the transient response of the power supply. If we simplify the electronic load as a MOSFET, when the MOSFET is connected to the power supply, the voltage of the power supply must reach the MOSFET Vds voltage before current flows through it. . Therefore, the electronic load cannot be started at zero voltage from its basic structure.

How do you accomplish a zero voltage startup application?

You only need to connect a power supply in series to offset the voltage change of Vds to start at zero voltage.

Possible applications: supercapacitors, fuel cells

PEL-3211 booster can only be connected in parallel with PEL-3111.

Five PEL-3111 units can be connected in parallel or PEL-3111 can be combined with PEL-3211*4

A maximum of five electronic loads of the same type as PEL-3021 or PEL-3041 can be connected in parallel.

Five PEL-3021 units can be connected in parallel

Five PEL-3041 units can be connected in parallel

The same is true for H series high pressure models

Application keyword: parallel connection of electronic loads