Product Upgrade Notice: UHP-1000/1500/2500 & PHP-3500 Upgraded with Over Temperature Automatic De-rating Function
The conduction-cooled UHP family is MEAN WELL new generation of industrial control power supply, and its unique fanless design has been well received by the market since release. UHP family 1000W and above products (UHP-1000/1500/2500 & PHP-3500) come with the Programmable Current (PC) function, which allows the output current to be modulated between 20%~100% by applying an external 1~5VDC control signal. One common application for the PC function is the charging application. Customers can use the PC function to control the charge rate of batteries. During the charging operation, if the temperature is too high, traditional over-temperature protection will shut-off the output power completely until the temperature cools down. The upgraded UHP-1000/1500/2500 & PHP-3500 will have automatic output power de-rating when operated with the PC function, which will effectively improve product reliability and still charge the batteries at a slower rate to maintain equipment operation.
Figure 1 shows the new de-rating curve added to the UHP-1000 specification sheet. When the power supply is operating under PC mode and full load conditions, the output current will de-rate to 50% when the operating temperature exceeds the maximum ambient temperature. If the temperature continues to rise, then the output will shut-off until the power supply is cool enough to be re-powered on. Figure 2 is the new de-rating curve of UHP-1500/2500 & PHP-3500, which is slightly different from the UHP-1000 automatic de-rating curve. Firstly, the automatic de-rating will activate when either PC function or communication protocol is utilized. Secondly, there will be a de-rating of 10%/℃ when the temperature rises from T1 to T2.
The upgrade has been implemented to new productions of UHP-1000/1500/2500 starting November 6th, 2019 (Production Lot: W1912A). PHP-3500’s standard products already have this function built-in. All over-temperature incurred by the product upgrade will be absorbed by MEAN WELL, and the product price will not be adjusted. If you have any questions about the product upgrade, please reference the newest product specification sheet posted on the MEAN WELL public website or check with your MEAN WELL sales representative.
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