IEC 61204 pdf download.Low-voltage power supply devices, d.c. output – Performance characteristics
1.1 Scope and object
This international Standard describes a method for specifying requirements for low-voltage power supply devices (including switching types) providing d.c. output(s) up to 200 V d.c. at a power level of up to 30 kW, operating from a.c. or d.c. source voltages of up to 600 V. The devices are for use within class I equipment or for free-standing operation when used with adequate electrical and mechanical protection. This standard is intended to be used for all types of a.c. or d.c. driver power supplies with any number of outputs, specially produced for an unknown final application. In the case where power supplies are developed as a component of equipment covered by specific product standards, these standards apply; the additional application of IEC 61 204 may be useful as an option, especially if the performance characteristics are not sufficiently covered by the product standard. It permits to specify a power unit to meet a particular application by the specification of parameters at required performance levels, to establish the essential definitions related to this type of equipment, and to establish a selection of levels of performance. These levels are carefully graded to enable manufacturers and users to select and specify a range of power supply devices suitable for their application.
2 Presentation of performance characteristics
The performance characteristics are detailed in 3.1 to 8.1 and are in accordance with the performance criteria listed in table III of IEC 60478-2. The performance figure defines the maximum change (not typical) in the measured quantity which may be either positive or negative unless specified otherwise. Note that this implies that a 1 % change may mean a maximum difference of 2 % between quantities measured on a number of units. The performance parameters are measured at 25 °C unless otherwise stated. Tests relating to performance characteristics shall be as stated in table III of IEC 60478-2. Where a specific instruction appears to conflict with that indicated in table I or III, this standard shall take precedence. The performance characteristics presentation of table I illustrates a typical application. The indication of the present IEC publication subclause numbering is mandatory. The absence of a performance figure indicates that no requirements exist. Indicating the performance letter coding within brackets is optional.
3.1 Rated outputs and total output power The output voltages and performance levels of the unit shall be stated for each parameter. For a multiple output power supply, performance levels shall be indicated for each output. The manufacturer/(user) shall confirm/(specify) that the variations in output voltage of the unit comply with the stated limits given in 3.2 to 3.1 8, as appropriate, under the least favourable combination of source voltage, load and temperature at the stated output level of the unit. The manufacturer/(user) shall confirm/(specify) the minimum load value for the controlling output in a multiple output power supply that is required to maintain any other parameter within the specification. The nature of each output and its polarity, if fixed, shall also be stated or specified. If the loads are defined by the customer, then the rated value of these loads shall be used in performance measurements. In all other cases, the output to be measured shall be at maximum, other outputs at 50 % of their rated output load, and voltage input of the power supply shall be at rated value. The manufacturer/(user) shall confirm/(specify) the total output power at one of the preferred high ambient operating temperatures of 3.2.