USB输出电压有没有要求
大家好,有没有哪位高手知道USB输出电压也是有要求的?是不是要求4.75~5.25V,是哪里有这样的规定?请高人指点迷津。From Wiki:
USB supplies bus power across VBUS and GND at a nominal voltage 5 V ± 5%, at supply, to power USB devices.
Power is sourced solely from upstream devices or hosts, and is consumed solely by downstream devices.
USB provides for various voltage drops and losses in providing bus power.
As such, the voltage at the hub port is specified to be in the range 5.00 +0.25 /−0.60 V by USB 2.0, and 5.00 +0.25 / −0.55 V by USB 3.0.
Normal USB port:
5.0 +0.25 / -0.25 V
Hub port:
USB 2.0:5.0 +0.25 / -0.6 V
USB 3.0:5.0 +0.25 / -0.55 V H-RH大大回答的好呀~~ 这个只是USB行业规范,对于安全来说没有严格的要求 H-RH 发表于 2016-7-15 19:59 static/image/common/back.gif
From Wiki:
USB supplies bus power across VBUS and GND at a nominal voltage 5 V ± 5%, at supply,...
非常感谢:handshake 学习了:D 记得之前有人问过, 请参考USB规范标准。 H-RH 发表于 2016-7-15 19:59
From Wiki:
USB supplies bus power across VBUS and GND at a nominal voltage 5 V ± 5%, at supply,...
有快充功能的适配器的输出会大于5V,符合要求吗? zha 发表于 2017-8-22 16:48
有快充功能的适配器的输出会大于5V,符合要求吗?
QC 3.0 是有智能调节电压的, 能兼容普通 USB 装置,即会先检查被充电装置是否兼容 QC 3.0 才会提升电压至最适合之伏数! 想知道在做安规标准(例如60950,60065)的时候,是否也要满足这个要求。举个例,如果产品正常带载的情况下电压小于4.75V,产品是否也算是不合格?
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