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 provides 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.