Lambda / TDK / EMI EMHP 400-70

The Lambda/TDK EMI EMHP 400-70 is a three-phase AC input SCR-type DC power supply delivering 28 kW of regulated power at up to 400 V and 70 A. Built on regulated SCR phase control topology, this high-power unIt has constant voltage/constant current regulation with automatic crossover, meeting the demands of industrial and laboratory applications requiring stable bulk power delivery.

Technical Specifications

Power Output: 28 kW

Output Voltage: 0–400 V maximum

Output Current: 0–70 A maximum

Input Voltage: 460 VAC ±10% (30–60 Hz); operates within full specification 440–480 VAC

Topology: Regulated SCR phase control with three-phase AC input

DC Output Ripple: 70 mVrms @ 60 Hz

Voltage/Current Regulation: ±0.1% line and load regulation; ±0.05% stability over 8 hours

Transient Response: Output recovers to within 1% of final value within 200 ms for load steps between 50% and 100% rated current

Cooling: Forced air

Key Features

Constant voltage and constant current modes with seamless automatic crossover

Fully programmable via remote resistance, voltage, or current control

Output voltage and current metering provided

Overvoltage, overtemperature, and overcurrent protection

RFI protection integrated

Circuit breaker and contactor interlock control

Optional digital programming via IEEE 488 or RS232 (consult factory)

Phase-to-phase balance requirement: +2% for ripple specification

Phase-to-phase rotation sequence of AC input not required

Typical Applications Industrial test and burn-in environments, laboratory power delivery systems, and demanding applications requiring high-current DC regulation and minimal output ripple.

Compatibility & Integration Accepts three-phase 460 VAC ±10% input (30–60 Hz) across a 440–480 VAC operating window. Supports external control programming and optional IEEE 488/RS232 interfaces. Note: This product line is not recommended for new designs; TDK-Lambda recommends evaluating Genesys™ or GENESYS+™ series alternatives.