Corsair RMi Series 1000 W Review 29

Corsair RMi Series 1000 W Review

Load Regulation, Hold-up Time & Inrush Current »

A Look Inside & Component Analysis

Before reading this page, we strongly suggest a look at this article, which will help you understand the internal components of a PSU much better. Our main tool for the disassembly of the PSU is a Thermaltronics TMT-9000S soldering and rework station. It is of extreme quality and is equipped with a matching de-soldering gun. With such equipment in hand, breaking apart every PSU is like a walk in the park!

Corsair RM1000i Parts Description
Primary Side
Transient Filter6x Y caps, 2x X caps, 2x CM chokes,
1x MOV
Bridge Rectifier(s)2x GBJ25L06 (600V, 25A @ 100°C)
Inrush Current ProtectionNTC Thermistor
APFC Mosfets3x Vishay Siliconix SIHF22N60E (650V, 13A @ 100°C, 0.18Ω @ 25°C)
APFC Boost Diode1x CREE C3D10060A (600V, 14A @ 135°C)
Hold-up Cap(s)2x Nippon Chemi-Con (400V, 680uF & 470uF or 1150uF combined, 105°C, KMR series, 2000h @ 105°C).
Main Switchers2x Vishay Siliconix SiHG30N60E (650V, 18A @ 100°C, 0.125Ω @ 25°C)
APFC ControllerInfineon ICE3PCS01G - CM03X
Switching ControllerInfineon ICE2HS01G
TopologyPrimary side: Half-Bridge & LLC Resonant Converter
Secondary side: Synchronous Rectification & DC-DC converters
Secondary Side
+12V8x Sinopower SM4021NAKP (40V, 100A @ 100°C, 2.7mΩ ) @ VGS=6V)
5V & 3.3VDC-DC Converters: 4x M3006D & 2x M3004D fets
PWM Controllers: 1x APW7159
Filtering CapacitorsElectrolytics: Chemi-Con (105°C, KZE series)
Polymers: Chemi-Con
Supervisor ICWeltrend WT7502 & 2x Weltrend WT7518
Fan ModelNR135P (12 V, 0.22 A, fluid dynamic bearing)
5VSB Circuit
Rectifying DiodePFR20V45CT (45V, 20A, VF: 0.42V max @ 125°C)
Standby PWM Controller-

This is actually a HX1000i with some component changes that lowered efficiency a tad while boosting performance everywhere else. The RM1000i, for example, not only uses exclusive Japanese capacitors and has much larger bulk capacitors (1150uF combined capacity vs 940uF of the HX1000i), which will significant increase hold-up time. We don't know the actual reasons behind these changes, but Corsair made a point of further improving the platform in some rather crucial areas, which is very strange considering the RMi line is situated below the HXi series.

This unit's heatsinks are very small and the secondary side doesn't even come with a proper heatsink. CWT's latest design approach, it seems to work well in even semi-passive PSUs, and Corsair is obviously very confident about the design's reliability or the unit wouldn't come with a seven year warranty.

The first part of the AC receptacle hosts two Y caps, and the main PCB holds another four Y caps, two X caps, and two CM chokes. There is also an MOV to protect the unit against spikes from the power grid.

The two GBJ25L06 bridge rectifiers are installed on a small dedicated heatsink.

The APFC converter utilizes three Vishay Siliconix SIHF22N60E fets and a CREE C3D10060A boost diodes. Both bulk caps are provided by Chemi-Con (400V, 680uF & 470uF or 1150uF combined, 105°C, KMR series, 2000h @ 105°C) and their combined capacity is very large for even a 1 kW PSU, which is good.

The main switchers are two Vishay Siliconix SiHG30N60E fets that are supported by an LLC resonant converter.

Here is the NTC thermistor that protects the unit against large inrush currents.

The APFC controller, an Infineon ICE3PCS01G, and a CM03X Green PFC controller are on a vertical daughter board that also hosts the resonant controller, an Infineon ICE2HS01G IC.

As has already been noted, there are no proper heatsinks in the secondary side. The mosfets that regulate the +12V rail, eight Sinopower SM4021NAKPs, installed on two vertical daughter-boards, are cooled by the bus-bars that transfer power to and from them. All electrolytic caps are also by Chemi-Con; these caps are rated at 105°C.

Both VRMs (Voltage Regulation Modules) are installed on this large vertical PCB. Their common PWM controller is an Anpec APW7159, and each VRM comes with two M3006Ds and one M3004D.

A Weltrend WT7502 supervisor IC is installed on the mainboard. There are also two WT7518 supervisor ICs on the modular PCB; these probably provide OCP for the +12V rail once you enable multi-rail mode through Corsair Link.

The SBR that regulates the 5VSB rail is a PFR20V45CT that can handle up to 20A of current.

This board hosts the MCU (PIC32MX) that allows the PSU to communicate with the Corsair Link software. This PSU's platform is controlled by analog components; however, it also features a digital interface to transmit data about its state. The digital interface even allows you to control the cooling fan. The Corsair Link software provides interesting options as it can be used to monitor and log fan speed and current or +3.3V, +5V, and +12V voltages. You can also monitor power-out, check power-in and efficiency or enable and disable OCP on the +12V rails.

The modular PCB's primary side is only covered in polymer filtering caps by Chemi-Con. The HX1000i uses Apaq and Enesol here, which might be good as well, but we strongly believe that these Chemi-Cons are even better. Several thick cables on the back of the modular board transfer power from the main PCB to the modular sockets.

Soldering quality is very good. We didn't spot any long component leads.

The RM1000i uses the same fan as the HX1000i. It is a very quiet fan at even higher speeds, and its model number is NR135P (12 V, 0.22 A). Under normal ambient temperatures, the fan speed won't exceed 1200 RPM even with a full load, and only a worst-case scenario (>48°C ambient and a full-load for a very long time) will have it operate at around 1550 RPM.
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May 24th, 2022 05:48 EDT change timezone

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