Modular Power Systems

Modular Power Systems use standard building blocks to implement a total solution. An ac to dc "supply" can be implemented in one enclosure or broken up thoughout a system for a distributed power architecture. Greatest benefits include:

• A high degree of flexibility
• Quick Time to Market
• Low design in costs
• Minimal NRE

Motor Controllers

Most servo systems run off three phase power. PFC allows higher usage (up to 3kW) off a single phase system. Clean distortion free power allows for:

• More efficient AC power utilization
• Better performance (especially for accelerating large inertial loads)

System Upgrade for CE Compliance

Most power supplies that accept a wide range AC input (85-265 VAC) can also run of a high voltage DC input (380 VDC) with little or no modification. The addition of an MFE module can enable a system to be upgraded with PFC for little or no power supply redesign (critical for systems with custom power supplies). Its integral EMI filtering could permit hardware trade-offs in some systems.

Optional Chassis Mount I/F

An optional chassis mount interface is available which provides a pair of VDE approved terminal blocks for interfacing electrically to the module. This option is ideal for system upgrade or any application where a printed circuit board is not necessary.

The option is denoted by a "-01" suffix. (ex: MFE250-01)

Power Factor Correction

Power Factor is the ratio of the real power (in watts) divided by the apparent power (in volt-amperes). It has a maximum value of 1.0.

A typical power supply draws non-sinusoidal current off the AC line resulting in:

• Large surges of current
• Low power factor (~0.6)
• Harmonic noise generated onto the line
• Voltage and Current Distortion (THD)

Power factor correction shapes the input current to be sinusoidal. It does this by integrating high frequency currents through the boost converter over the entire 360 degrees of the input sine wave.

A power factor corrected power supply controls its input current resultng in:

• A sinusoidal input current
• High power factor (~1)
• Minimal harmonic noise generated onto the line
• Low THD (<10%)