PIONEER MAGNETICS PM3398B

Thickened extruded aluminum alloy integrated rack shell, the metal rack serves as both mechanical protection frame and auxiliary heat dissipation channel for internal power conversion components. The front panel is equipped with detachable drawer-type power connector module, realizing hot plugging and quick module replacement without cutting off the entire rack power supply bus.

Large-size low-loss soft magnetic ferrite planar core is the universal core component of all PM3398B variant modules. Multi-layer thick copper foil parallel laminated windings are adopted for high-current output variants, effectively reducing high-frequency AC copper loss and heat generation under large current working conditions. The magnetic core assembly is fixed on the bottom aluminum alloy heat dissipation baseplate with high thermal conductivity insulating adhesive, transferring internal heat to the rack shell for forced air cooling heat exchange.

Thick copper layer industrial FR4 printed circuit board carries all high-power switching tubes, rectifier bridge stacks, large-capacity filter electrolytic capacitors and PWM power control chips. All high-current circuit traces adopt widened thick copper layout to minimize circuit resistance and avoid abnormal heating under continuous large current load.

Independent sealed air duct partition design inside the aluminum rack shell, the built-in cooling fan forms directional airflow circulation through the air duct, sequentially passing the planar magnetic core assembly, power switching tube heat sinks and filter capacitor bank to take away heat generated by each high-power heating component, realizing uniform overall internal temperature distribution without local hot spot overheating phenomenon.

Three-phase or single-phase alternating current input passes through front-end EMI filter network to eliminate grid high-frequency interference noise, then enters full-bridge rectifier circuit to convert AC into raw DC voltage. The built-in active power factor correction control circuit dynamically adjusts input current waveform to synchronize with input AC voltage phase, eliminating input current harmonic distortion and improving power utilization efficiency of industrial power grid.

PFC stabilized high-voltage DC bus voltage is sent to high-power full-bridge MOSFET switching tube array controlled by high-frequency PWM main control chip. The chip dynamically adjusts switching duty cycle and phase shift control logic according to real-time output voltage and current sampling feedback signals to realize closed-loop output voltage and current double closed-loop regulation. High-frequency pulsed power energy is transmitted to the secondary side through the large-size planar magnetic core assembly, which provides complete galvanic isolation between input high-voltage bus and low-voltage output load side.

High-frequency alternating current induced on transformer secondary multi-parallel copper foil windings is converted to smooth low-voltage direct current through synchronous rectifier MOSFET array with low forward voltage drop, reducing rectification power loss compared with traditional diode rectifier circuits. Multi-stage LC low-pass filter network composed of high-current filter inductors and low-ESR high-capacity electrolytic capacitors eliminates high-frequency switching ripple noise on output DC voltage, providing clean stable DC power for rear-end industrial load equipment.

Multiple independent real-time sampling monitoring circuits continuously collect input bus voltage, output load voltage, output load current and internal component temperature data during the entire power conversion cycle. Once any electrical or thermal operating parameter exceeds preset safe threshold values, the protection control logic immediately cuts off main PWM switching tube drive signals to lock power conversion output, avoiding permanent burnout damage to planar magnetic windings, power switching tubes and filter capacitors caused by overload, short-circuit or over-temperature faults. After fault elimination and module cooling, the protection logic automatically resets to restore normal power conversion operation.

When multiple PM3398B variant modules are connected in parallel redundant configuration, internal current sharing control circuit automatically distributes balanced load current among all parallel modules to avoid single module overload operation. Front panel reserved fault signal output dry contact interface transmits real-time module fault status signals to upper industrial SCADA monitoring system, realizing remote real-time power supply equipment operation status monitoring and fault early warning alarm functions.

The PM3398B series modules are designed exclusively for standard industrial 5-inch rack cabinet horizontal installation; vertical or upside-down mounting is strictly prohibited, which will block internal cooling fan directional airflow circulation and lead to serious internal hot spot overheating.

Reserve minimum 30 mm vertical empty clearance space above and below the rack-mounted module to ensure unobstructed hot air exhaust and cold air intake for forced air cooling system. Do not install high heat-generating equipment such as servo drive power modules, contactor banks and high-power resistance load boxes within 15 cm horizontal distance of the module rack shell to avoid external high-temperature radiation superimposing internal heat load.

The standard Elcon drawer-type hot-plug power connector must be fully inserted and locked into the front panel connector socket after module rack installation, confirm connector locking buckle is fully engaged to prevent loose contact under equipment vibration environment causing abnormal heating and power supply interruption faults.

Input three-phase/single-phase AC power wiring adopts high-current shielded twisted power cable with wire cross-section matched to module rated input current; all input power cable shielding layers must be reliably connected to electrical cabinet main protective earth ground bus bar to suppress power grid high-frequency electromagnetic interference.

Output load power wiring uses thick low-resistance copper cable with cross-section corresponding to module maximum output current rating; separate positive and negative output wiring layout, avoid long-distance parallel bundling of input high-voltage power cables and output low-voltage load cables to prevent cross-channel voltage coupling interference leading to output voltage fluctuation instability.

The aluminum alloy rack shell of each PM3398B module must be connected to cabinet protective earth ground bus bar with dedicated thick ground wire to eliminate static electricity accumulation on metal rack and reduce electromagnetic radiation interference to surrounding sensitive industrial control equipment.

All PM3398B variant modules must be installed inside fully sealed dust-proof industrial electrical rack cabinets; open rack installation exposed to factory metal cutting dust, machine tool oil mist, corrosive acid/alkali chemical gas and direct water splash is forbidden, these contaminants will corrode internal circuit board traces, planar magnetic winding insulation layers and cooling fan bearing components, leading to permanent module hardware failure.

Avoid installing the module rack near equipment cooling fan exhaust outlets; high-speed exhaust airflow carrying dust particles will continuously accumulate on module front panel connectors and internal cooling air duct filter screens, blocking cooling airflow and gradually reducing heat dissipation efficiency during long-term continuous operation.