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QC/T 1152-2021 PDF EnglishSearch result: QC/T 1152-2021_English: PDF (QC/T1152-2021)
QC/T1152-2021 (QCT1152-2021): PDF in EnglishQC/T 1152-2021 QC AUTOMOBILE INDUSTRY STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 43.140 CCS T 85 Specification of DC/DC converter for electric motorcycles and electric mopeds ISSUED ON: AUGUST 21, 2021 IMPLEMENTED ON: FEBRUARY 01, 2022 Issued by: Ministry of Industry and Information Technology of PRC Specification of DC/DC converter for electric motorcycles and electric mopeds 1 Scope This document specifies the product model compilation, requirements, test methods, markings of DC/DC converter for electric motorcycles and electric mopeds. This document applies to DC/DC converters for electric motorcycles and electric mopeds. 2 Normative references The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, for dated references, only the version corresponding to the date applies to this document; for undated references, the latest version (including all amendments) is applicable to this document. GB/T 2423.1 Environmental testing - Part 2: Test methods - Tests A: Cold GB/T 2423.2 Environmental testing - Part 2: Test methods - Tests B: Dry heat GB/T 2423.5 Environmental testing - Part 2: Test methods - Test Ea and guidance: Shock GB/T 2423.17 Environmental testing for electric and electronic products - Part 2: Test method - Test Ka: Salt mist GB/T 2423.34-2012 Environmental testing - Part 2: Test methods - Test Z/AD: Composite temperature/humidity cyclic test GB/T 4208 Degrees of protection provided by enclosure (IP code) GB 34660 Road vehicles - Requirements and test methods of electromagnetic compatibility QC/T 680-2014 General technical specifications for voltage regulators for motorcycles and mopeds QC/T 792-2007 Motors and controllers for electric motorcycles and electric mopeds 3.6 Rated power Under the specified environmental conditions, rated voltage, continuous operation, the maximum power at which the DC/DC converter can work continuously, after reaching thermal stabilization under the temperature rise limit. 3.7 Peak power The maximum power that the DC/DC converter can work continuously, under the specified environmental conditions and within the specified time. 3.8 Thermal equilibrium The state under which the temperature rise of the heating part of the DC/DC converter casing does not change by more than 1 K within 0.5 h. Note: Thermal equilibrium can be defined by a time-temperature rise diagram, that is, the connecting line -- between the start and end points of adjacent intervals of 0.5 h has a gradient of 1 K or less than 1 K every 0.5 h, OR a gradient of 2 K or less than 2 K every 1 h. 3.9 Ripple factor Ratio -- of half the difference between the peak value and the valley value of the pulsating DC power TO the absolute value of the DC component. 3.10 Dynamic response time The time it takes for the system to change from a stable working state to another stable working state, after being stimulated. 4 Compilation of product model 4.1 General The model of the DC/DC converter shall be composed of two parts: product name code and performance parameter code. The model nomenclature of the DC/DC converter is as shown in Figure 1: Figure 1 -- Schematic diagram of model nomenclature 4.2 Product name code DC/DC converter product name code is ZB; if necessary, an extended name code can be added, after the basic name code; the two are separated by the symbol "-". The extended name code is: G - Isolated type. 4.3 Performance parameter code 4.3.1 The performance parameter code includes four parts: rated power code, nominal input voltage code, rated output voltage code, one-way and two-way code. The voltage unit indicated in the model name is V; the power unit is W. 4.3.2 The rated power, nominal input voltage, rated output voltage in the performance parameter code are all integer digits, of which the nominal input voltage and rated output voltage are 3 integer digits, the rated power is 4 integer digits; 0 is added in front, if its digit is insufficient. 4.3.3 For DC/DC converters with multiple outputs, all rated output voltage values shall be marked and separated by "/". 4.3.4 For two-way DC/DC converters, all nominal input voltage values and rated output voltage values shall be identified and separated by "/". 4.4 Example of product model Examples of product models are as follows: Example 1: ZB 0120-072-012 A: Indicates a one-way non-isolated DC-DC converter, which has a rated power of 120 W, a nominal input voltage of 72 V, a rated output voltage of 12 V. Example 2: ZB-G 1000-072-012/005 B: Indicates two-way isolated DC-DC converter, which has a rated power of 1000 W, a nominal input voltage of 72 V, a rated output voltage of 12 V/5 V, two-way, isolated. The two letters A and B represent one-way and two-way respectively Three Arabic numerals indicate rated output voltage Three Arabic numerals indicate nominal input voltage Four Arabic numerals indicate rated power ZB-G stands for isolated DC/DC converter 5.4 Environmental adaptability 5.4.1 Low temperature After the DC/DC converter is tested, according to the provisions of 6.5.1, under the environment of -25 °C ± 1 °C, the insulation resistance shall meet the requirements of Table 1; the electrical performance shall meet the requirements of 5.3.2 and 5.3.3. 5.4.2 High temperature After the DC/DC converter is tested according to the provisions of 6.5.2, under the environment of 60 °C ± 1 °C, the insulation resistance shall meet the requirements of Table 1; the electrical performance shall meet the requirements of 5.3.2 and 5.3.3. 5.4.3 Combined temperature/humidity cycle After the DC/DC converter is subjected to 2 cycles of combined temperature/humidity cycle test as specified in 6.5.3, the insulation resistance shall meet the requirements of Table 1; the electrical performance shall meet the requirements of 5.3.2 and 5.3.3, appearance rust shall not affect normal work. 5.4.4 Salt spray The DC/DC converter shall be subjected to the salt spray test as specified in 6.5.4. After the test is completed and allowed to stand, the electrical performance shall meet the requirements of 5.3.2 and 5.3.3. 5.4.5 Vibration The DC/DC converter shall be subjected to the vibration test, in accordance with the provisions of 6.5.5. The parts shall not be loose or damaged during the test. After the test, the electrical properties shall meet the requirements of 5.3.2 and 5.3.3. 5.4.6 Shock The DC/DC converter shall be subjected to the shock test, in accordance with the provisions of 6.5.6. The parts shall not be loose or damaged during the test. After the test, the electrical performance shall meet the requirements of 5.3.2 and 5.3.3. 5.4.7 Degree of protection The product's degree of protection of the DC/DC converter shall meet the requirements of IP55 in GB/T 4208. 5.5 Protection function 5.5.1 Output current limit protection The DC/DC converter shall have the output current limiting protection function. When the output load increases to the current limiting state, which is specified in the technical documents of the enterprise, the converter shall be able to enter the protection state. The output current shall be limited to the current limiting value range, which is specified in the technical documents of the enterprise, AND no longer increase. 5.5.2 Input undervoltage protection The DC/DC converter shall have the function of input under-voltage protection. When the input voltage is lower than the under-voltage protection value, which is specified in the technical documents of the enterprise, the converter shall be able to enter the protection state and no longer output. When the input voltage recovers from the under- voltage protection value to within the normal operating voltage range, which is specified in the enterprise's technical documents, the converter shall be able to automatically resume normal operation OR resume normal operation after restarting. 5.5.3 Output short circuit protection The DC/DC converter shall have output short-circuit protection function. When the output is short-circuited, the converter shall stop the output immediately. After the fault is removed, the converter shall be able to automatically resume normal operation OR resume normal operation after restarting. 5.6 Enable control For DC/DC converters, which are equipped with an enable switch, when the nominal input voltage is provided at the input, if turning on the enable switch, the converter shall start working; if turning off the enable switch, the converter shall enter the standby or off state. 5.7 Electromagnetic compatibility The electromagnetic radiation emission limit of DC/DC converter shall meet the requirements for electrical/electronic components (ESA) in GB 34660. The DC/DC converter is subjected to the electromagnetic radiation immunity test, according to the provisions of GB 34660, for the electrical/electronic components (ESA). The deviation of the rated output voltage before the test, during the test and after the test shall not exceed ±10%. 5.8 Service life Carry out the test according to the method of 6.9. The fault-free working time of the DC/DC converter shall not be less than 1000 h. During the test, when the DC/DC converter is not working, the terminals of the same independent circuit in the DC/DC converter shall be short-circuited. Use a voltage withstanding tester, to apply the following test voltage, between the terminals of each independent live circuit of the DC/DC converter and (ground) enclosure, as well as between the input circuit and the output circuit of the isolated DC/DC converter, for a duration of 1 min. Record the leakage current during the test. a) The frequency of the alternating current is 50 Hz ~ 60 Hz; the waveform is an actual sine wave; b) The capacity of the test equipment is not less than 0.5 kV·A.......Source: https://www.ChineseStandard.net/PDF.aspx/QCT1152-2021 |