Load control of the primary rails
The following graphs show the voltage values of the main busbars recorded over a range of 60 W up to the maximum specified load and the deviation (in percent) for the same load range. Tight load regulation is an essential feature for any power supply as it allows constant voltage levels despite load changes. Here, potent graphics cards and CPUs often act like fire accelerators and, with a bit of bad luck, operation becomes unexpectedly unstable.
Load regulation is satisfactory at +12 V and 5 V and tight at 3.3 V. The measurement curves show this quite clearly:
Ripple
Ripple represents the AC fluctuations (periodic) and noise (random) that occur in the DC rails of power supplies. Ripple significantly shortens the life of capacitors by increasing their temperature; a 10 °C increase, for example, can shorten the life of a capacitor by up to 50 %. Ripple also plays an important role in the stability of the overall system, especially when overclocked. The limits for the residual ripple are 120 mV (+12V) and 50 mV (+5V, +3.3V and 5VSB) according to the ATX specification.
Ripple Measurements – Corsair RM850x | |||||
---|---|---|---|---|---|
Test | 12 V | 5 V | 3.3 V | 5VSB | Pass/Fail |
10% Load | 4.5 mV | 3.5 mV | 2.7 mV | 5.3 mV | Passport |
20% Load | 7.1 mV | 3.4 mV | 3.2 mV | 5.8 mV | Passport |
30% Load | 7.0 mV | 3.7 mV | 2.8 mV | 5.3 mV | Passport |
40% Load | 6.4 mV | 3.6 mV | 3.2 mV | 5.3 mV | Passport |
50% Load | 6.1 mV | 6.1 mV | 7.4 mV | 7.3 mV | Passport |
60% Load | 5.5 mV | 3.9 mV | 3.4 mV | 5.3 mV | Passport |
70% Load | 5.6 mV | 4.3 mV | 3.8 mV | 6.1 mV | Passport |
80% Load | 5.9 mV | 4.7 mV | 7.1 mV | 5.8 mV | Passport |
90% Load | 5.8 mV | 5.2 mV | 8.1 mV | 5.9 mV | Passport |
100% Load | 9.1 mV | 5.5 mV | 8.8 mV | 6.8 mV | Passport |
110% Load | 8.9 mV | 5.4 mV | 7.4 mV | 6.5 mV | Passport |
Crossload 1 | 5.0 mV | 4.3 mV | 7.5 mV | 5.9 mV | Passport |
Crossload 2 | 8.2 mV | 5.1 mV | 6.0 mV | 6.3 mV | Passport |
Ripple at 100% load
Ripple at 110% load
Ripple Crossload 1
Ripple Crossload 2
- 1 - Unboxing, Vorstellung und technische Daten
- 2 - Anschluss-Kabel und Kabel-Management
- 3 - Innerer Aufbau und Komponenten
- 4 - Spannungsregulation und Restwelligkeit (Ripple)
- 5 - Effizienz
- 6 - Geräuschemission und Lüfterdrehzahlen
- 7 - Crossload im Detail
- 8 - Timing Tests
- 9 - Erweiterte Transienten-Tests
- 10 - Schutzfunktionen, Power Sequencing, EMV
- 11 - Zusammenfassung und Fazit
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