In addition to the following clauses, this chapter of GB/T 19212.1-2016 applies to changes in input voltage settings: the following clauses are added to this chapter: based on the type of transformer supplying the corresponding output circuit, if the output voltage does not exceed the rated output voltage and the no-load output voltage does not exceed the output voltage deviation limit, a wider power supply voltage range (such as AC 100 V to AC 240 V) is allowed. This chapter of GB/T 19212.1-2016 applies to the output voltage and output current of the load. In addition to the following provisions, this chapter of GB/T 19212.1-2016 applies to the no-load output voltage: the following content is added to this chapter: at ambient temperature, when SMPS is connected to the rated power supply voltage at the rated power frequency, the no-load output voltage is measured. The no-load output voltage should not exceed: for SMPS with built-in separation transformers or autotransformers, it should be AC 1000 V or ripple free DC 1415 V-- For SMPS with built-in isolation transformers, it is AC 500 V or ripple free DC 708 V; For SMPS with built-in safety isolation transformers, it is AC 50V or ripple free DC 120V. For independent transformers, this output voltage limit also applies to the case of star series connection of output windings that are not predetermined to be interconnected. The difference between the no-load output voltage and the load output voltage should not be too large
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