This standard specifies the method for determining the technical requirements for low-voltage power supply equipment (including switching type) with an output DC voltage below 250V, power less than 30kW, and powered by an AC or DC source voltage below 600V. When used for electrical or mechanical protection, the device is used within the scope of Class I equipment or operates independently. This standard covers all types of equipment powered by AC or DC, of ??any number of outputs, including power equipment used in military, industrial, communications and commercial applications. Special cases apply to medical and toys. This standard does not apply to underwater and similar special occasions, nor does it apply to medical equipment with live parts that can extend into the human body. GB 17478-1998 Characteristics and safety requirements for low-voltage DC power supply equipment GB17478-1998 Standard download and decompression password: www.bzxz.net

GB17478—1998 | | tt | This standard will serve as a standard for all types of low-voltage DC power supply equipment with AC or DC input and any output value. This standard makes mandatory requirements for the safety of power supplies. The ambient temperature, frequency, impact, collision, vibration and other contents of this standard have been modified according to the corresponding national standards. Appendix A, Appendix B, Appendix C, Appendix D, Appendix E and Appendix F of this standard are all appendices of the standard. The difference between this standard and the IEC standard is the addition of Appendix E and Appendix F, which are translations of the relevant provisions of the relevant IEC standards cited in this standard.
This standard will be implemented from the date of issuance, with a transition period of one year. This standard was proposed by the Ministry of Machinery Industry of the People's Republic of China. This standard is under the jurisdiction of the National Power Electronics Standardization Technical Committee. The units responsible for drafting this standard: Xi'an Electric Power Rectifier Factory, Qingdao Rectifier General Factory. Units participating in the drafting of this standard: Xi'an Power Electronics Technology Research Institute, Shanghai Jingda Voltage Regulator Factory, Shanghai Instrument Research Institute. The main drafters of this standard: Pan Jingyi, Zhou Shijian, Zhou Guanyun, Lu Jun, Zhang Hua, and Zhang Yinfu. This standard is entrusted to the National Power Electronics Standardization Technical Committee to be responsible for interpretation. GB17478-1998
IEC Preface
1) The International Electrotechnical Commission (IEC) is a worldwide standardization organization composed of all national electrotechnical committees (IEC National Committees). The purpose of the IEC is to promote international cooperation on all issues of standardization in the field of electricity and electronics. IEC achieves this purpose by publishing international standards. The preparatory work is done by technical committees and may be participated by any IEC National Committee interested in the project involved. International organizations, governmental organizations and non-governmental organizations related to IEC can also participate in the preparatory work. The International Electrotechnical Commission (IEC) and the International Organization for Standardization (ISO) work closely together based on the agreement reached between the two organizations. 2) The formal resolutions or agreements of the International Electrotechnical Commission (IEC) on technical issues are formulated by technical committees in which all national committees that are particularly concerned about the issue participate. It expresses as much as possible the international understanding of the issues involved. unanimous opinion. 3) These resolutions or agreements are for international use in the form of recommended standards and are accepted by national committees in this sense. 4) In order to promote international unification, IEC expresses the hope that each national committee should adopt the contents of IEC recommended standards as their own national regulations to the extent permitted by their domestic circumstances. Inconsistencies between IEC recommended standards and corresponding national standards should be clearly pointed out in the provisions of national standards as much as possible.
The international standard IEC1204 is formulated by the "Stabilized Power Supply" Group of the 22E Subcommittee of the IEC22 Technical Committee "Power Electronics". The contents of this standard are based on the following documents: Draft International Standard
22E(CO)24
All votes to approve this standard are indicated in the voting report in the table above. Voting report
22E(CO)26
1 Overview
1.1 Scope
National Standard of the People's Republic of China
Characteristics and safety requirements for low-voltage DC power supply equipment Low-voltage power supply devices,dcoutput-Performance characteristics and safety requirementsGB 174781998
eqvIEC1204:1993
This standard specifies that the output DC voltage is below 250V, the power is less than 30kW, and it is powered by an AC or DC source below 600V Method for determining technical requirements for voltage-powered low-voltage power supply equipment (including switching type). When used for electrical or mechanical protection, the device is used within the scope of Class I equipment, or operates independently.
This standard covers all types of equipment powered by AC or DC, of ??any number of outputs, including power equipment used in military, industrial, communications and commercial applications. Suitable for medical and toys under special circumstances. This standard does not apply to underwater and similar special occasions, nor does it apply to medical equipment with live parts that can extend into the human body. This standard allows the specification of technical parameters that can meet the technical performance level required for specialized power supply equipment, and establishes basic definitions related to this type of equipment, as well as determines specific technical requirements. It enables manufacturers and users to select and determine the applicable scope of their power supply equipment based on specified technical requirements. However, the indicators given in each sub-clause of the current IEC publications must be adhered to. 1.2 Referenced standards
The provisions contained in the following standards constitute provisions of this standard by being quoted in this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision and parties using this standard should explore the possibility of using the latest version of the standard listed below. GB156-1993 Standard Voltage (neqIEC38:1983) GB/T2423.1-1989 Basic Environmental Testing Procedures for Electrical and Electronic Products Test A: Low Temperature Test Method (eqv IEC 68-2-1:1974)
GB/T2423. 2—1989
Basic Environmental Testing Procedures for Electrical and Electronic Products Test B: High Temperature Test Method
(eqvIEC68-2-2:1974)
GB/T2423.3--1993 Electrical and Electronics Product Basic Environmental Testing Procedure Test Ca: Constant Humidity and Heat Test Method
(eqvIEC68-2-3:1969)
GB/T2423.5-1995 Environmental Testing of Electrical and Electronic Products Part 2: Test Method Test Ea and Guide: Impact (idt IEC68-2-27:1987)
GB/T2423.6-1995 Environmental testing of electrical and electronic products Part 2: Test methods Test Eb and Guide: Impact (idt IEC 68 -2-29:1987)
GB/T2423.10—1995
5 Environmental Testing of Electrical and Electronic Products
Part 2: Test Method Test Fc and Guidelines: Vibration (Sinusoidal )(idtIEC68-2-6:1982)
GB/T3047.1-1995
Basic dimension series for panels, shelves and cabinets with a height of 20mm GB/T3859.1-1993 Regulations on basic requirements for semiconductor converters (eqvIEC146-1-1:1991) GB/T3859.2-1993 Application Guidelines for Semiconductor Converters (eqvIEC146-1-2:1991) GB/T3907-1983||tt| |3 Basic Measurement Methods for Industrial Radio Interference
National Bureau of Quality and Technical Supervision approved on 24 August 1998 for implementation on 1999-09-01
GB17478—1998
GB/T4365—1995 Electromagnetic Compatibility Terminology (idtIEC50(161):1990) GB/T4798.1-1986 Electrical and electronic products application environmental conditions: storage GB/T4798.2-1996 Electrical and electronic products application environmental conditions: transportation (neqIEC721-3-2:1985) GB/ T4942.2—1993
GB/T13926.4—1992
GB/T16935.1--1997
IEC 478-1:1974
IEC478-2: 1986 | | tt | Electromagnetic compatibility of process measurement and control devices Electrical fast transient/burst requirements (idtIEC801-4:1988)
Insulation coordination of equipment within low-voltage systems
(idt IEC 664-1:1992)
Part One: Principles, Requirements and Tests
DC Output Regulated Power Supply
Part One: Terms and Definitions
Part Two: Ratings and Performance||tt ||DC output regulated power supply
Part 3: Reference level and measurement of conducted electromagnetic interference DC output regulated power supply
DC output regulated power supply
DC output regulated power supply
Sound level meter
IEC651:1979
IEC950:1991
Part 4: Tests other than radio frequency interference
Part 5: Near-field magnetic component measurements
Safety of information technology equipment, including commercial electrical equipment MIL-HDBK- 217E: 1974 Electronic Equipment Reliability Prediction 1.3 Definition 1
Except for items redefined in this standard, the definitions in IEC950 and IEC478-11 apply to this standard. 1.3.1 Electromagnetic interference Electromagnetic interference is an unwanted signal or electromagnetic disturbance that may cause damage to useful signals. 1.3.2 Radio interference radiointerference is electromagnetic interference in the radio frequency band.
1.3.3 Conducted interference conducted interference is electromagnetic interference that propagates along a conductor.
1.3.4 Radiated interference Radiated interference is electromagnetic interference that propagates through space in the form of electromagnetic waves. 1.3.5 Interference source: Any component, device, device, equipment, system or natural phenomenon that produces electromagnetic interference. 1.3.6 Industrial interference Industrial interference refers to the electromagnetic interference generated by various electrical and electronic equipment or systems. 2 Representation of performance characteristics
For detailed description of characteristics, see 3.1~8.1, and for performance indicators, see IEC478-2:1986 Table 27. The performance number is defined as the maximum (atypical) amount of change in the measured value. Unless otherwise stated, measured values ??may be positive or negative. Note that a measurement change of 1% in the case of multiple devices means that the maximum variation between devices can be up to 2%. Unless otherwise specified, performance parameters are measured at 25°C. Tests related to performance characteristics are in accordance with the provisions of IEC478-2:1986. If there is a conflict between special terms and Table 1 of this standard or Table I of IEC478-2:1986, this standard should take precedence. Adoption instructions:
1] Since IEC478-1 and IEC950 currently do not have corresponding national standards. For ease of use, this standard places the translation of IEC478-1:1974 in Appendix E (the appendix of the standard).
2] For ease of use, the translation of the performance indicators shown in Table I of IEC478-2:1986 is placed in Appendix F (the appendix of the standard). GB17478-1998
The characteristics shown in Table 1 illustrate a typical application. The contents of this standard's provisions in the table are mandatory. Performance values ??that are not indicated are not required. The words in brackets are optional. 1 Representation of characteristics
Table 1
3.1
3.2
3.3
3. 4
3.5
3.6| |tt||3.7
3.8
3.9
3.10
3.11
3.12
3.13
3.14||tt ||3.15
Rated output
Total output power
Working environment temperature range
Storage environment range
Source voltage and frequency
Source Current
Actual root mean square value RMS
Repetition peak
Surge peak
Harmonic distortion factor
Power factor
Efficiency||tt ||Source regulation rate
Load change
Load regulation rate
Basic error
Output voltage adjustability
Range
Resolution
Periodic and random deviations
a) Source frequency
b) Switching frequency
c) Total (30MHz)
Interaction effects (Cross regulation)
Load change
Temperature coefficient
Maintenance time
Start-up time
Turn-on (turn-off) overshoot
Main output: 5V
1: 12V
Auxiliary circuit
Auxiliary circuit 2: 24V
1000W (55℃)
Low: 0℃ (D)
High: 50℃(D)
150A
15A
8A
(When the high temperature is 70C, the rated value exceeding 50C will be attenuated by 2.5%/C ), internal fan forced cooling
-40C~+85C(A)
Low: 88V~132V(C)
High: 176V~264V(C)
Frequency range: 48Hz~63Hz(B)
Input 88V; 20 A, input 176V: 10A
Input 88V: 50A, input 176V: 25A
30A|| tt||0. 65
0.65
70%
Main output
0.1%(A)
0%~100%(A)| |tt||0.2%(A)
N/A
80%~120%
1%
0.1%(A)
0.5 %(A)
1%(B)
0.2%(A)
0%~100%(A)
0.02%/℃(B)| |tt||20ms(A)
1s
None
(C)
(A)
Auxiliary output
0.1% (A)
0%~100% (A)
0.2%(A)
N/A
80%~120%
1 %
0.1%(A)
0.5%(A)
1% (B)
0.2%(A)
0%~100 %(A)
0.02%/C(B)
N/A
1s
None
(C)
( A)
3.16
3.17
3.18
3.19
4
5.2
5. 4||tt| |6.1
6.2
6.3
6.4
6.5
3 Performance
Transient response to load current changes||tt| |Voltage deviation
Recovery time
Load change
Output over-voltage protection
Electronic suppression
Output over-current protection
Mean trouble-free Time (MTBF)
Safety requirements
Conducted electromagnetic interference (EMI)
Transient input voltage
Remote control
Remote measurement||tt ||Mechanical Characteristics
Series operation
Parallel operation
3.1 Rated output power and total output power
GB17478—1998
Table 1 (End)| |tt||Main output
5% (B)
1ms (A)
50%~100% (D)
110%~130%(C )
Constant current
Auxiliary output
(E)
(B)
(A)
65000hMIL-HDBK-217E, 25C,Gb
Protection level: 1
Overvoltage type: 1
Pollution degree: 2
IEC478-3:1989
2 kv(D )
Curve A
Resistance control (A) and voltage control (B)
500mV (A)
203mmX127mmX330mm
250V
The output voltage and performance level of equal current sharing (A)
equipment should be specified for each parameter. For multiple output power supplies, the performance level of each output should be stated.
The manufacturer or user should confirm or specify that the variation range of the equipment output voltage complies with 3.2~3.18 regulations. Where appropriate, device output levels stated are those at the most adverse combination of supply voltage, load and temperature. For adjustable output, the manufacturer or user should confirm or specify the minimum load of the multi-channel output power supply. At this time, other parameters are required to remain within the technical conditions. Even for fixed outputs, the performance of each output and its polarity should be stated or specified, and if the loads are specified by the user, then the ratings of these loads should be used in performance measurements. In the case of multiple loads, the measured output should be the maximum value, other outputs should be measured at 50% of the rated output load, and the input voltage of the power supply should be the rated value. The manufacturer or user should confirm or state the total output power operating ambient temperature range at a high ambient temperature proposed in 3.2
3.2
The operating temperature range of the equipment should be specified, and the following should be given priority A type of range. The manufacturer should confirm that the power supply can operate continuously under the most adverse environmental conditions given the maximum temperature, maximum rated power and natural cooling (natural air cooling) at an altitude of 2000m. It is clearly stated that when the temperature increases, the output current and output power should be reduced. If the power supply uses forced air cooling or conduction cooling, the operating conditions should be clearly defined, and the equipment will be tested under these cooling conditions. Low temperature: A
B
c
D
E
-40℃
-25℃
-10 ℃
oc
+5c
High temperature: A
B
c
D
E||tt| |+85℃
+70℃
+55℃
+50℃
+40℃
GB17478—1998
Environment The temperature is defined as the final steady-state temperature when the power supply dissipates maximum power. For convection cooling, this temperature is measured 50mm below the power supply; for forced air cooling, this temperature is measured at the air inlet. 3.3 Storage and transportation ambient temperature range
The manufacturer should confirm the temperature range of the equipment storage. A: -40℃~+70℃; B: -25℃~+55℃. The manufacturer should confirm the temperature range for equipment transportation. A: 40℃～+70℃; B: -25℃～+70℃. If pre-treatment is required before use due to the risk of condensation, the manufacturer should explain the measures to be taken. The manufacturer should confirm the relative humidity range within which the equipment will be stored. A: 10%~100%; B: 5%~95%
The manufacturer should determine the relative humidity range during equipment transportation according to Table 1 in GB/T4798.2-1996. 3.4 Source voltage and frequency
The range of acceptable source voltage values ??for the device should be determined, with priority given to one or more of the ones given below. -GB156-1993 regulations:
Priority source voltage range:
Single-phase AC (ac): Wide value range: A
85V~264V
85V~ 132V
Low value range: B
C
88V~132V
93V~132V
D
E
High value range: B
C
D
90V~110V
170V~264V
176V~264 V
187V~264V
195V~264V
E
207V~253V
F
48Hz~440Hz
Frequency range: A
B
48Hz~63Hz
The above values ??contain tolerances. If manual control range changes are required, they should be clearly specified. Three-phase AC (ac): The three-phase AC power grid should give priority to the specified values ????of GB156. Direct current (dc): The specified value of GB156 should be given priority. Other values ??and ranges are allowed, but should be clearly specified and agreed between user and supplier. Another approach is to specify the nominal input voltage and tolerance. 3.5
Source current
specifies the following parameters under nominal and most unfavorable conditions: a) root mean square value (rms) of the source current; b) source repetitive peak current (only applicable to AC power supply ): c) Surge peak current 2];
d) Harmonic distortion factor (THD) of the source current waveform; e) Power factor (input W/input VA) (only for AC source); Adoption instructions:
1] In the case of non-sinusoidal waves, care should be taken to use a measuring instrument that can give a true rms reading. 2] When measuring the peak surge current, the charging current flowing into the EMI suppression capacitor in the first thousandth of a second after the switch is turned on is ignored. f) Efficiency.
GB17478-1998
If the most unfavorable conditions do not include the maximum load, the actual load should be specified. Perform acceptance inspection on the specified performance according to Chapter 12 of IEC478-4:1976. 3.6 Source effect (source regulation rate)
Within the specified range of source voltage and frequency, when the power supply specifies the output voltage, the regulation rate when each output load reaches 50% of the maximum load should be specified, and is specified as follows One of the priority values: A
B
c
D
E
0.1%
0.2%
0.5 %
1%
Not specified
According to Chapter 2 of IEC478-4:1976, the specified performance shall be subject to acceptance inspection. 3.7
Load effect (load regulation)
For each output, within the specified load range and at the most unfavorable supply voltage, the load regulation shall be as specified, and the following priority values ??shall be selected One:
Load Regulation
A0.2%
B0.5%
1%
D5%
E10%
Load change
A0%~100%
B10%~100%
C25%~100%
D50%~100%||tt ||If the adjustment rate is non-linear, it is recommended to give the relationship between the measured parameters in graph form. The test was conducted under two different load settings as follows. Setting 1: All outputs are 100% full load. Use 1a when the total power rating is exceeded: Setting 1a: Except for one load change, all other outputs are 50% of full load or loads equal to the percentage of full power; setting 2: Except for one change, all other outputs are at minimum load. Perform acceptance inspection on the specified performance according to Chapter 1 of IEC478-4:1976. 3.8 Output voltage tolerance (basic error) - For constant output at nominal source voltage and each output at half rated load, the output voltage tolerance will be determined according to one of the following given priority values: A0.5%|| tt||B 1%
C 2%
D5%
E10%
According to the performance specified by the test circuit in Figure 6 of IEC478-4:1976 Carry out inspection. 3.9 Adjustability of output voltage
The adjustment range and resolution of each adjustable output should be determined under the conditions of nominal source voltage and half load. If adjusting one output will affect other outputs, its adjustability should be stated. 3.10 Periodic and random deviations
The ripple and noise performance of each output should be specified as follows, and one of the following priority values ??should be selected: A0.5% (peak-to-peak)
B1% Peak-to-peak)
C2%(peak-to-peak)bZxz.net
D5%(peak-to-peak)
E10%(peak-to-peak)
GB17478—1998|| tt|| should give the following three types of periodic and random changes: a) low-frequency noise:
source frequency and its harmonics (for AC sources only); b) switching noise: ||tt| |Switching frequency and its harmonics;
c) includes the total deviation of the spike pulse (use measuring equipment with sufficient bandwidth). Test the specified performance according to the method of Appendix A (standard appendix). It is worth noting that the methods and definitions shown in Appendix A are different from those of IEC478-4.
If special weighting is applicable in areas such as communications, its measurement methods and detailed results should be added to the above description. 3.11 Interaction effect (cross regulation rate) Within the specified load range, for a multi-channel output power supply, if the load change of one output can cause voltage changes of other channels, it should be explained, and one of the following priority values ??should be selected: || tt||cross adjustment rate
A0.2%
B2%
C 5%
D10%
E20%
Load change
A0%100%||tt ||B10%~100%
C25%~100%
D50%~100%
The following two situations need to be considered for the interaction effect: 1) All outputs are 100% full load, Use 1a when the total power rating is exceeded; 1a) Except for one way of load change, all other outputs are 50% of full load or equal percentage loads that reach full power; 2) Except for one way of change, all other outputs are minimum load . Perform acceptance inspection on the specified performance according to Chapter 1 of IEC478-4:1976. 3.12 Temperature coefficient
The temperature coefficient should be specified and one of the following priority values ??should be selected: A0.01%/℃
B0.02%/℃C
C0.05%/℃
In practical applications, the temperature coefficient is a controllable parameter, and it is recommended to use a graph in which the output voltage changes with temperature. Test the specified performance according to Chapter 6 of IEC478-4:1976. 3.13 Maintenance time (off-delay time) Starting from the nominal output voltage and output power, at the lowest source voltage of 10%, the output voltage maintenance time is within the specified nominal range. For DC input, the actual maintenance time should be specified. For AC input, the maintenance time is specified as one of the following times: A is greater than 20ms starting from the adjacent zero-crossing point; after the power supply voltage is interrupted; B is 20ms starting from the adjacent zero-crossing point. ;
C starts 10ms from the adjacent zero-crossing point;
D is less than 10ms.
Test the specified performance according to the test circuit in Figure 6 of IEC478-4:1976. 3.14 After the power-on time (on-on delay time) source is turned on, the time it takes for the output voltage to enter the specified bandwidth should be specified and specified as one of the following priority values: A0.1s
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