Three Phase PWM Rectifier SQL60A Bridge Diode 60A Aluminum Case for Industrial Power Supply

SQL60A Three-Phase Bridge Rectifier — 60A, Aluminum Case, Industrial Power Supply

The SQL60A is a three-phase bridge rectifier module rated at 60A continuous forward current, housed in an aluminium case for efficient heat dissipation. It converts three-phase AC input (3Φ AC) to DC output using six internal rectifier diodes in a full-wave bridge configuration, providing smooth DC output with low ripple compared to single-phase rectification. Suitable for industrial power supplies, three-phase motor drives, inverters, and welding equipment requiring high-current DC rectification from three-phase mains.

Technical Specifications

Parameter	Value
Model	SQL60A
Configuration	Three-phase full-wave bridge (6-diode)
Continuous Forward Current (IF)	60A
Peak Repetitive Reverse Voltage (VRRM)	Check datasheet (typically 600V–1200V)
Forward Voltage Drop (VF)	~1.1V per diode at rated current
Operating Temperature	−40°C to +150°C (junction)
Case	Aluminium (bolt-down, heatsink compatible)
Terminals	3 × AC input (U, V, W) + DC+ and DC− output
Mounting	Bolt-down to heatsink (M5 bolt)
Certification	CE, RoHS

Three-Phase Rectification Reference

Parameter	Formula / Value
DC Output Voltage (no load)	V_DC = 1.35 × V_AC(line-to-line)
Example: 380V 3Φ input	V_DC ≈ 513V DC (no load)
Example: 220V 3Φ input	V_DC ≈ 297V DC (no load)
Ripple Frequency	6 × mains frequency (300Hz at 50Hz mains)
Ripple Factor	~4% (much lower than single-phase)

Typical Applications

• Industrial Power Supply: Three-phase AC-to-DC rectification for industrial DC power supplies, battery chargers, and electroplating power supplies
• Variable Frequency Drive (VFD): Input rectifier stage for three-phase VFD motor drives converting 380V 3Φ AC to DC bus voltage
• Welding Equipment: High-current DC rectifier for three-phase MIG, TIG, and MMA welding power sources
• Induction Heating: DC bus rectifier for three-phase induction heating power supplies
• UPS Systems: Three-phase rectifier for industrial UPS and power conditioning equipment

Installation Notes

• Mount the SQL60A to a heatsink using thermal compound and an M5 bolt for adequate heat dissipation at rated current
• Connect three-phase AC input to terminals U, V, W (phase sequence does not affect DC output polarity)
• Connect DC load between DC+ and DC− output terminals
• Add a bulk electrolytic capacitor across DC+ and DC− to reduce output ripple
• Ensure the heatsink thermal resistance is adequate to keep junction temperature below 150°C at rated load

FAQ

Q: Does the SQL60A require a heatsink?
A: Yes. At rated 60A current, the SQL60A dissipates approximately 66W (6 diodes × 1.1V × 10A each). A heatsink with thermal resistance ≤1.5°C/W is required to keep junction temperature within safe limits at full load.

Q: Can the SQL60A be used for single-phase rectification?
A: Yes. Connect single-phase AC to any two of the three AC input terminals (e.g., U and V) and leave the third terminal (W) unconnected. This uses 4 of the 6 internal diodes as a single-phase bridge rectifier, with a reduced current rating.

Package Contents

• 1 × SQL60A three-phase bridge rectifier module (aluminium case)

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