Jou Jye BITWIN BW-B520JL 520W Review 0

Jou Jye BITWIN BW-B520JL 520W Review

Transient Response Tests »

Test Setup

All measurements are performed utilizing a custom designed and built load tester, called Faganas, which is able to stress PSUs up to 1800 Watts. We also use a DS1M12 (Stingray) oscilloscope, a CHY 502 thermometer, a Fluke 175 multimeter and an Instek GPM-8212 power meter. Furthermore, in our setup we have included a wooden box, which along with a heating element is used as a Hot Box. Finally, we have at our disposal three electronic loads (Array 3711A, 300W), a Rigol 1052E oscilloscope and a CEM DT-8852 sound level meter. In the near future we plan to acquire six additional loads to complete our new test set up, which with the help of our custom built software will have the same capabilities with the, ultra expensive, Chroma ATEs.

Voltage Regulation Charts

The following charts show the voltage values of the main rails, recorded over a range from 60W to the maximum specified load, and the deviation (in percent), when compared with the voltage values at 60W load.







Efficiency Chart

In this chart you will find the efficiency of BW-B520JL at low loads and at loads equal to 20-100% of PSU’s maximum rated load.



Voltage Regulation and Efficiency Measurements

The first set of tests reveals the stability of voltage rails and the efficiency of BW-B520JL. The applied load equals to (approximately) 20%, 40%, 50%, 60%, 80% and 100%, of the maximum load that the PSU can handle. In addition, we conduct two more tests. In the first we stress the two minor rails (5V & 3.3V) with the maximum load that our tester can apply to these rails, while the load at +12V is only 2A and in the second test we dial the maximum load that +12V can handle while load at minor rails is minimum.

Voltage Regulation & Efficiency Testing Data
Jou Jye BW-B520JL
Test12 V5 V3.3 VPower
(DC/AC)
EfficiencyTemp
(In/Out)
PF/AC
Volts
20% Load7.960A1.997A2.206A114.76W85.20 %37.6 °C0.968
12.214V5.074V3.356V134.70W40.1 °C233.7V
40% Load14.086A4.870A6.115A216.84W86.79 %38.5 °C0.988
12.224V5.003V3.318V249.85W41.3 °C233.1V
50% Load16.276A6.757A8.184A259.79W86.44 %39.7 °C0.991
12.245V4.960V3.296V300.55W42.9 °C233.3V
60% Load22.178A6.773A8.178A331.09W86.47 %39.9 °C0.993
12.199V4.968V3.288V382.90W44.9 °C232.0V
80% Load28.105A8.897A9.744A417.94W84.78 %41.7 °C0.989
12.181V4.927V3.259V493.00W47.3 °C219.1V
100% Load37.421A8.887A9.735A527.77W84.50 %44.1 °C0.994
12.090V4.920V3.249V624.60W52.3 °C231.8V
Crossload 12.097A18.874A17.217A169.65W76.73 %43.2 °C0.986
12.707V4.632V3.228V221.10W47.7 °C232.9V
Crossload 242.162A2.036A2.166A517.99W85.16 %48.1 °C0.994
11.870V5.104V3.296V608.25W55.4 °C232.3V

Voltage regulation at +12V is close to 1% and for the minor rails is a little over 3%. Efficiency peaks at 86.79% with 40% load. A strange thing we noticed one the +12V line is that through 20%-50% load instead of dropping, the voltage was increasing. Group regulation has something to do with this. The latter is also responsible for the bad results in our Crossload 1 test. When we pushed the minor rails too much, voltage at +12V went sky high. However this scenario will never be reproduced by a contemporary PC, even though it's mentioned in the ATX specification. Typical computer systems draw power mainly from +12V rail and only a few Amperes from 5V and 3.3V. (note: at CL1 tests we exceeded by a small margin, 13.36W, the maximum combined rated capacity of the minor rails).

Efficiency at Low Loads

In the next tests, we measure the efficiency of BW-B520JL at loads much lower than 20% of its maximum rated load (the lowest load that the 80 Plus Standard measures). The loads that we dial are (approximately) 40, 65 and 90W. This is important for scenarios in which a typical office PC is in idle with power saving turned on.

Efficiency at Low Loads
Jou Jye BW-B520JL
Test #12 V5 V3.3 VPower
(DC/AC)
EfficiencyPF/AC
Volts
11.983A1.965A2.215A41.74W74.40 %0.875
12.280V5.058V3.362V56.10W235.2V
24.011A1.972A2.211A66.54W80.51 %0.931
12.247V5.066V3.358V82.65W234.5V
36.050A1.975A2.208A91.37W83.94 %0.955
12.224V5.068V3.355V108.85W234.1V

Efficiency in tests#2 and #3 are satisfactory since the result is above the 80% limit. In test#1 we expected a little higher efficiency, but on the other hand we shouldn't forget that this PSU is only Bronze rated.

Power Consumption in Idle & Standby

In the table below you will find the power consumption and the voltage values of all rails (except -12V), when the PSU is in idle mode (on but without any load at its rails) and the power consumption when the PSU is in standby (without any load at 5VSB).

Idle / Standby
Jou Jye BW-B520JL
Mode12 V5 V3.3 V5VSBPower (AC)PF/AC Volts
Idle12.191V5.136V3.385V5.050V5.440W0.283
235.4V
Standby 0.44W0.025
232.1V

At idle power consumption is low and in standby mode is well under 1W, the limit that the 2010 EuP (European Guideline on Energy using Products) sets.
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May 21st, 2024 21:36 EDT change timezone

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