IN Brief:
- The EDC family comprises 1.5 kW and 3 kW DC-DC models with nominal 60 V or 130 V outputs.
- RS-485 Modbus RTU and analogue interfaces provide programmable voltage, current and operating diagnostics.
- Series or parallel arrangements and leader/follower control support larger DC conversion systems.
TDK-Lambda has introduced the EDC series of programmable DC-DC power supplies for applications using distributed direct-current power. The family combines 1.5 kW and 3 kW models with selectable 60 V or 130 V nominal outputs, constant-voltage and constant-current control, and communications for monitoring multiple devices. The range is intended for systems in which energy storage, renewable generation or industrial equipment already operates on a DC bus and requires a different regulated voltage for the connected load.
The EDCL1500 range accepts 70–220 V DC input, while the EDCM3000 models are designed for 160–420 V DC. At the output, the 1.5 kW versions provide nominal combinations of 60 V at 25 A or 130 V at 11.6 A; their 3 kW counterparts are specified at 60 V and 50 A or 130 V and 23.2 A. Output voltage and current are programmable within the applicable model limits, supporting either regulated voltage delivery or controlled current to a compatible load.
DC distribution can avoid some intermediate conversion stages when a source and load can be connected through an appropriately designed DC-DC converter. Photovoltaic generation and battery storage both inherently produce or store DC energy, while many electronic loads ultimately use DC internally. Converting DC into alternating current for transport through one part of a system and converting it back can introduce additional equipment and losses. The electrical architecture still needs to account for voltage matching, isolation, protection, switching and the conditions under which direct-current conversion is suitable.
The EDC series addresses voltage and current matching through constant-voltage and constant-current operation. A constant-voltage configuration maintains a selected output level as load current changes within the converter’s capabilities. Constant-current regulation provides a controlled current for compatible processes or charging arrangements. Hydrogen generation and high-power battery charging are among the applications identified by the manufacturer, alongside switchgear systems and solid-oxide fuel-cell installations. Each demands its own protection strategy and control parameters.
Up to three EDC units can be connected in series and up to ten in parallel, according to TDK-Lambda. Series operation increases the available output voltage, while parallel operation increases the combined current capability when the units are controlled and protected appropriately. Leader/follower control and automatic identification are intended to support coordinated operation across a group. The allowable total voltage, current and fault response still depend on the configured installation, rather than on the number of connected converters alone.
Remote operation uses RS-485 communication with Modbus RTU, a common industrial protocol that can link converters to a supervisory controller. The interface provides status information, operating hours, power-on hours, alarm records and fault histories. Monitoring those values can help maintenance teams identify repeated shutdowns or operating conditions associated with a problem, while the controller can coordinate settings across an installation. The system remains dependent on appropriate addressing, network termination, fault handling and control logic.
The supplies also accept 1–5 V and 4–20 mA analogue control signals, allowing a programmable controller to set parameters through conventional industrial wiring. A serial link provides more detailed status and fault information, while an analogue reference can be useful where the existing control system has no Modbus interface. In either case, cable routing, scaling, shielding and fail-safe behaviour must be established during integration, especially where current regulation is used in a process or charging application.
The units measure 270 × 150 × 61 mm and are housed in enclosed packages. TDK-Lambda specifies a typical efficiency of 91% for the EDCL1500-60 and 93% for the EDCM3000-60, with efficiency figures tied to the particular model and test conditions. The company also cites conservative electrolytic-capacitor operating temperatures as part of its long-life design and provides a seven-year warranty for the series. Thermal design, cooling arrangements and installation conditions remain relevant when multiple converters are installed in a confined enclosure.
The initial product range lists four models, covering both power ratings and both output-voltage options, alongside communication manuals, datasheets and mechanical drawings. Its configurable control interfaces and coordinated-unit operation provide defined integration options for systems using multiple DC voltage levels. Installation design must still establish the required input protection, operating temperature and load behaviour before the converters are placed into service.
