Traditional testing methods typically require multiple instruments working together, resulting in complex wiring and limited control precision. By using two high-performance bidirectional DC power supplies with analog control functionality, such tests can be performed efficiently and accurately.

Recently, a customer proposed a testing requirement: to use two IT6000C series bidirectional DC power supplies to generate a 20 Hz sine wave with positive and negative current variation, and apply it to a self-developed IGBT module to evaluate its performance under AC current conditions. The customer connects the IGBT module in series between the two power supplies—one operating as a source and the other as a load—to achieve bidirectional current flow.

The schematic diagram of the customer’s wiring is as follows:

In this test, the IT6000C series bidirectional DC power supplies demonstrated several key advantages:

High-precision analog control capability
The IT6000C supports analog control interfaces (0–5 V / 0–10 V) for real-time control of output current or voltage. By using an external signal generator to produce a 20 Hz sine wave signal and feeding it into the analog control port of the power supply, users can precisely control the output current to follow a sinusoidal pattern. The transition between positive and negative current is smooth and seamless, with no step delays, greatly enhancing waveform accuracy and reliability.

Bidirectional energy flow – multifunctional in one unit
This series features true bidirectional operation—it can function as a source to deliver power or as a sink to absorb power, with energy fed back to the grid for high efficiency and energy savings. In this test, one unit operates in sourcing mode to provide positive current, while the other operates in sinking mode to absorb negative current. Together, they form a complete current loop, perfectly simulating the bidirectional current conditions that an IGBT experiences in real-world circuits.

High bandwidth and fast response
The IT6000C offers high control bandwidth and rapid dynamic response. With selectable CV (constant voltage) and CC (constant current) priority modes, the power supply can remain stable in either control loop. It can accurately reproduce low-frequency sine waves in the 20–100 Hz range, maintaining distortion-free, stable output during current transitions—fully meeting the dynamic performance requirements of low-frequency AC testing.

Multiple operating modes and protection mechanisms
In addition to conventional constant voltage (CV) and constant current (CC) modes, the IT6000C also supports various composite modes and sequence functions, allowing users to flexibly configure output waveforms. Meanwhile, multiple built-in protection mechanisms—such as overvoltage, overcurrent, and overtemperature protection—ensure safe and reliable operation throughout the testing process. This makes the IT6000C particularly suitable for high-power and high-reliability device verification.

After implementing the IT6000C series into their testing setup, the customer reported that no additional load devices or complex conditioning circuits were required. With just two power supplies and an analog control signal, a complete testing environment could be established quickly, significantly simplifying wiring and operation. The test results were stable and repeatable, with highly reliable data that fully met their requirements for verifying the bidirectional current capability of the IGBT module.

In conclusion, the IT6000C series bidirectional DC power supply not only excels in conventional power testing but also demonstrates outstanding versatility and reliability in bidirectional dynamic testing of power devices. It is an ideal choice for performing high-performance power electronics testing in both industrial and laboratory environments.