IEC 61000-4-17 applies to low-voltage d.c. power ports of equipment supplied by external rectifier systems, or batteries that are being charged. The object of this standard is to establish a common and reproducible basis for testing, in a laboratory, electrical and electronic equipment when subjected to ripple voltages such as those generated by rectifier systems and/or auxiliary service battery chargers overlaying on d.c. power supply sources.
IEC 61000-4-17 defines
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test voltage waveform
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range of test levels
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test generator
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test set-up
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test procedure.
The test described by IEC 61000-4-17 hereafter applies to electrical or electronic equipment and systems. It also applies to modules or subsystems whenever the equipment under test (EUT) rated power is greater than the test generator capacity specified in clause 6. This test does not apply to equipment connected to battery charger systems incorporating switch-mode converters.
The preferred range of test levels, applicable to the d.c. power supply port of the equipment, are given in table 1.
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Level
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Percentage of the nominal d.c. voltage
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1
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2
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2
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5
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3
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10
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4
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15
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X (open level)
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x
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The test levels are a peak-to-peak voltage expressed as a percentage of the nominal d.c. voltage Ud.c.
The amplitude of the ripple voltage is represented in figure 1 by the difference Umax – Umin.
The frequency of the ripple is the power frequency or its multiple 2, 3 or 6, as specified by a product committee or according to the EUT manufacturer’s specifications or according to the characteristics of the rectifier system (see also clause A.2).
The waveform of the ripple voltage, at the output of the test generator, has a sinusoid-linear character. A sinusoidal-linear characteristic can be described as a part of a sine wave and a line, tangent to the decreasing side of the rectified wave, that intersects the rising edge of the following half-wave; the voltage difference between the peak value of the sine wave and the point of intersection to the following half-wave is the ripple voltage.
Test generator
The test generator shall be able to operate in continuous mode with the following main specifications:
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Output voltage range (up to 360 V)
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Output voltage change with load: (0 to rated current) less than 5%
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Output voltage waveform: alternating component at power frequency or its multiple, with a sinusoid-linear character, superimposed on the d.c. voltage
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Output current (steady-state): up to 25 A
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Peak output current capability: (maximum allowable duration 5 ms) +2.5/0.5 times the steady-state current
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Ripple frequency tolerance: +/- 1 %
The use of a generator with higher or lower voltage/current capability is allowed provided that the other specifications (waveform, change with load, peak output current/steady-state current ratio, etc.) are preserved. The test generator output power/current capability shall be at least 20% greater than the EUT power/current ratings. The generator must be able to produce positive and negative peak current with positive voltage output.
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