VanGuard PSMU-350-3

Working Principle

1. Universal AC input filtered by two-stage EMI suppression circuit to eliminate conducted noise
2. PFC pre-regulator maintains stable DC bus voltage across wide input voltage fluctuation
3. Resonant full-bridge power stage achieves high efficiency low-loss high-frequency conversion
4. Three separate isolated transformer secondary circuits generate independent voltage rail outputs
5. Each output channel has dedicated feedback control loop and discrete OVP/OCP protection circuit
6. Digital power management IC monitors all channel voltage, current and temperature, triggers fault latch protection when out of safe operating range

Detailed Technical Performance Parameters

• AC Input Range: 90–264 VAC single-phase, 47–63Hz worldwide grid compatibility
• Total Rated Combined Output Power: 350 W maximum aggregate power across 3 channels
• 3 Independent Isolated Output Channels (Standard Configuration):

  Channel 1: +12 VDC / 18 A max

  Channel 2: +24 VDC / 6 A max

  Channel 3: +5 VDC / 10 A max

• Single Channel Overload Protection: 115–135% rated channel current, latch shutdown auto-recovery
• Global Overvoltage Protection: Each channel independent OVP threshold, no cross-channel fault propagation
• Efficiency: Peak efficiency 93.5% at 60–80% rated load
• Hold-Up Time: ≥20 ms @ 110VAC full rated load
• Cooling System: Dual temperature-controlled 40mm DC cooling fans, speed variable based on internal temperature
• Operating Ambient Temperature: 0°C ~ +50°C; derate 2.5% power per °C above 50°C
• Input-Output Isolation: 3000 VAC reinforced isolation per channel
• EMC Compliance: EN 55032 Class B industrial and laboratory equipment standard
• MTBF: 210,000 hours at 25°C nominal load

Material & Structural Characteristics

1. Chassis Housing: 1U height 19-inch rack-mount steel frame, black anti-static coating
2. Heat Dissipation Structure: Integrated aluminum extrusion heat sink along power semiconductors
3. Internal PCB: Multi-layer FR4 printed circuit board with tin-lead free high-temperature solder
4. Cooling Fans: Dual ball-bearing variable speed fans with dust filter mesh at air intake
5. Output Terminal Interface: Screw lock terminal blocks for each independent voltage channel
6. Front Panel: Power status LED, global fault alarm LED, DC-OK remote signal pin header
7. Mechanical Dimensions: 44.5mm (1U) × 482.6mm (19-inch rack width) × 260mm depth

Key Functional Features

1. Three fully galvanically isolated output channels eliminate cross-load voltage interference between different voltage devices
2. Independent channel protection prevents single load short-circuit from crashing other equipment power rails
3. Wide universal AC input supports laboratory and factory global power grid without voltage selection switch
4. Variable speed fan minimizes acoustic noise under light load operation
5. Remote power inhibit signal for external system power sequencing control
6. DC-OK logic signal output for host system power integrity monitoring
7. Hot-swap compatible rack slot design for rapid power unit replacement without full rack shutdown
8. Active power factor correction PF ≥0.92 reduces input harmonic distortion

Main Application Scenarios

• Industrial automated test bench multi-voltage control hardware power supply
• 19-inch rack-mounted industrial PC, data acquisition DAQ equipment power feed
• Laboratory automated measurement and inspection instrumentation racks
• Factory communication gateway, edge computing server multi-rail power supply
• Automated optical inspection (AOI) machine rack integrated power system

Installation Specifications

1. Mount unit into standard 19-inch EIA rack with front panel mounting screws, ensure horizontal level installation
2. Leave minimum 1 rack unit empty space above and below unit for airflow circulation
3. Air intake front panel filter mesh must face cool ambient air intake direction
4. Input AC wiring minimum 1.5mm² copper wire; each output channel wire sized per maximum channel current rating
5. Connect rack ground bus to unit rear earth terminal with 4mm² ground wire
6. Avoid installing adjacent to high heat generating equipment such as servo drives and power resistors

Usage & Maintenance Guidelines

1. Sum of all three channel output power cannot exceed total 350W rated aggregate limit
2. Clean fan intake dust filter mesh every 3 months to prevent airflow blockage and overheating
3. Do not operate unit at ambient temperature above 50°C without additional forced cabinet cooling
4. Verify each channel load polarity before power energization to avoid reverse voltage damage
5. Allow 15-minute cooling period after continuous full-load operation before rack removal
6. Replace dual cooling fans every 24 months to maintain thermal dissipation performance