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GB/T 24347-2021 (GB/T24347-2021, GBT 24347-2021, GBT24347-2021) & related versions
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GB/T 24347-2021: PDF in English (GBT 24347-2021)
GB/T 24347-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.080.01
CCS T 47
Replacing GB/T 24347-2009
DC/DC Converter for Electric Vehicles
ISSUED ON: AUGUST 20, 2021
IMPLEMENTED ON: MARCH 1, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative References ... 5 
3 Terms and Definitions ... 6 
4 Technical Requirements ... 7 
4.1 Appearance Requirements ... 7 
4.2 Input and Output Performance ... 8 
4.3 Protective Functions ... 9 
4.4 Environmental Adaptability ... 10 
4.5 Electromagnetic Compatibility ... 11 
4.6 Electrical Safety ... 14 
5 Test Methods ... 15 
5.1 Test Requirements ... 15 
5.2 Appearance Test ... 16 
5.3 Input and Output Performance Test ... 16 
5.4 Protective Functions Test ... 21 
5.5 Environmental Adaptability Test ... 24 
5.6 Electromagnetic Compatibility Test ... 25 
5.7 Electrical Safety Test ... 26 
Bibliography ... 28 
DC/DC Converter for Electric Vehicles
1 Scope
This Standard specifies the technical requirements and test methods of DC/DC
converter for electric vehicles.
This Standard is applicable to DC/DC converter for electric vehicles. Other circuits with
DC/DC conversion function may take this document as a reference.
2 Normative References
The contents of the following documents constitute indispensable clauses of this
document through normative references in the text. In terms of references with a
specified date, only versions with a specified date are applicable to this document. In
terms of references without a specified date, the latest version (including all the
modifications) is applicable to this document.
GB/T 18655-2018 Vehicles, Boats and Internal Combustion Engines - Radio
Disturbance Characteristics - Limits and Methods of Measurement for the Protection
of On-board Receivers
GB/T 19596 Terminology of Electric Vehicles
GB/T 19951 Road Vehicles - Disturbances Test Methods for Electrical / Electronic
Component from Electrostatic Discharge
GB/T 28046.3-2011 Road Vehicles - Environmental Conditions and Testing for
Electrical and Electronic Equipment - Part 3: Mechanical Loads
GB/T 28046.4-2011 Road Vehicles - Environmental Conditions and Testing for
Electrical and Electronic Equipment - Part 4: Climatic Loads
GB/T 29259 Road Vehicle - Electromagnetic Compatibility Terminology
ISO 7637-2:2011 Road Vehicles - Electrical Disturbances from Conduction and
Coupling - Part 2: Electrical Transient Conduction along Supply Lines Only
ISO 7637-3:2016 Road Vehicles - Electrical Disturbances from Conduction and
Coupling - Part 3: Electrical Transient Transmission by Capacitive and Inductive
Coupling via Lines Other Than Supply Lines
ISO 11452-2 Road Vehicles - Component Test Methods for Electrical Disturbances
from Narrowband Radiated Electromagnetic Energy - Part 2: Absorber-lined Shielded
Figure 1 -- Schematic Diagram of Overshoot and Response Time
3.3 Quiescent Current
Quiescent current refers to the current of the low-voltage battery consumed by the
DC/DC converter in the dormant state.
3.4 Weighted Efficiency
Weighted efficiency refers to the weighted average value of each efficiency of the load
spectrum corresponding to the DC/DC converter.
3.5 DC/DC for High Voltage Output
DC/DC for high voltage output refers to DC/DC converter with rated output voltage
level greater than 60 V and not greater than 1,500 V.
3.6 DC/DC for Low Voltage Output
DC/DC for low voltage output refers to DC/DC converter with rated output voltage level
not greater than 60 V.
3.7 Ripple Factor
Ripple factor refers to the ratio of the half of the difference between the peak value and
the valley value of the pulsating DC power to the absolute value of its DC component.
[source: GB/T 19826-2014, 3.8]
4 Technical Requirements
4.1 Appearance Requirements
4.1.1 The outer surface of the DC/DC converter for electric vehicles (hereinafter
referred to as “DC/DC”) shall manifest no obvious defects, for example, damage or
deformation.
4.1.2 The terminals or lead wires of the DC/DC shall be intact and undamaged; the
fastener connections shall not be loose.
4.1.3 The accessible surface of the DC/DC shall be free of rust, burrs, trimmings and
similar sharp edges.
4.1.4 The installation of the marks containing product information shall be upright and
firm, and the handwriting shall be clear.
4.2.5 Quiescent current
When the DC/DC does not have output, for the port that has a fixed electrical
connection with the low-voltage battery (cannot be controlled to disconnect), the
quiescent current shall not be greater than 3 mA.
4.2.6 Ripple factor of output voltage
The ripple factor of the DC/DC output voltage shall not be greater than 5%.
4.3 Protective Functions
4.3.1 Input overvoltage and undervoltage protection
When the DC/DC input voltage is greater than or equal to the overvoltage protection
value, or less than or equal to the undervoltage protection value, the output shall be
turned off or limited. After troubleshooting, the output can be automatically restored, or
after necessary human intervention.
The input overvoltage protection value and input undervoltage protection value shall
comply with the stipulations of the product technical documents.
4.3.2 Output overvoltage and undervoltage protection
When the DC/DC output voltage is greater than or equal to the overvoltage protection
value, or less than or equal to the undervoltage protection value, the output shall be
turned off or limited. After troubleshooting, the output can be automatically restored, or
after necessary human intervention.
The output overvoltage protection value and output undervoltage protection value shall
comply with the stipulations of the product technical documents.
4.3.3 Output short-circuit protection
For the DC/DC with short-circuit protection function, when a short-circuit occurs at the
DC/DC output terminal, the power output shall be turned off or limited. After
troubleshooting, the output can be automatically restored, or after necessary human
intervention.
4.3.4 Over-temperature protection
The DC/DC shall have over-temperature protection function. When the temperature of
the DC/DC temperature sampling point reaches the set value of the over-temperature
protection, the output shall be turned off or limited. After troubleshooting, the output
can be automatically restored, or after necessary human intervention.
The over-temperature protection value shall comply with the product technical
documents.
The high-temperature operation resistance of the DC/DC shall comply with the
requirements of 5.1.2.2 in GB/T 28046.4-2011.
4.4.4 Damp heat
4.4.4.1 Damp heat cycle
The damp heat cycle resistance of the DC/DC shall comply with the requirements of
5.6 in GB/T 28046.4-2011.
4.4.4.2 Steady-state damp heat
The steady-state damp heat resistance of the DC/DC shall comply with the
requirements of 5.7 in GB/T 28046.4-2011.
4.4.5 Salt spray
The salt spray resistance of the DC/DC shall comply with the requirements of 5.5 in
GB/T 28046.4-2011.
4.4.6 Vibration resistance
The vibration resistance of the DC/DC shall comply with the requirements of 4.1 in
GB/T 28046.3-2011.
4.4.7 Mechanical shock
The mechanical shock resistance of the DC/DC shall comply with the requirements of
4.2 in GB/T 28046.3-2011.
4.5 Electromagnetic Compatibility
4.5.1 Functional feature status
Functional feature status, which defines the expected target of functional features of
the device under test (DUT) in the test environment, is applicable to each independent
function of the DUT. It describes the working status of the expected function during and
after the test. Four functional feature statuses are provided below:
---Status I: the design function can be completed during and after the test;
---Status II: the design function cannot be completed during the test, but it can
automatically return to the normal status after the test;
---Status III: the design function cannot be completed during the test, but after the
test, through the simple operation of the testing personnel, it can return to the
normal status, for example, by turning on / off the DUT, or restarting;
---Status IV: the design function cannot be completed during the test, and more
4.5.3.1.1 For the measurement of unshielded systems and low-voltage artificial
network radio frequency ports through the conducted emission voltage method, the
limits shall comply with the limit requirements of Level-3 in Table 5 of GB/T 18655-2018,
or the stipulations of the product technical documents.
4.5.3.1.2 The measurement through the conducted voltage method by the shielded
power supply device shall comply with the limit requirements of Level-3 in Table I.1 of
GB/T 18655-2018, or the stipulations of the product technical documents.
4.5.3.1.3 The limits of the DC/DC conducted emission current probe method shall
comply with the limit requirements of Level-3 in Table 6 of GB/T 18655-2018, or the
stipulations of the product technical documents.
4.5.3.2 Radiated emission disturbance
The DC/DC radiated emission disturbance shall comply with the limit requirements of
Level-3 in Table 7 of GB/T 18655-2018, or the stipulations of the product technical
documents.
4.5.3.3 Electrical transient conduction disturbance along the power line
The electrical transient conduction disturbance of DC/DC along the power line shall
satisfy the requirements of Level III in Appendix B of ISO 7637-2:2011.
4.6 Electrical Safety
4.6.1 Insulation resistance
The insulation resistance of DC/DC shall satisfy the following requirements, or the
stipulations of the product technical documents.
a) The insulation resistance between each independent live circuit and the
ground (enclosure) shall be not less than 10 M;
b) The insulation resistance between the circuits without electrical connection
shall be not less than 10 M.
4.6.2 Voltage resistance
The voltage resistance between each independent circuit and the ground (enclosure)
and between the circuits without electrical connection shall comply with the stipulations
of Table 6. The duration of the voltage resistance test is 1 min; there shall be no
breakdown or arcing, and the leakage current limits shall comply with the stipulations
of the product technical documents.
---the DC/DC weighted efficiency, expressed in (%);
i---working condition No.;
n---total number of working conditions;
i---the efficiency of the DC/DC converter under i working condition, expressed in (%);
Pouti---the output power of the DC/DC converter under i working condition;
Pini---the input power of the DC/DC converter under i working condition;
wi---the load weight of the DC/DC converter under i working condition.
5.3.3 Rated power test
The test methods and steps are as follows:
a) In accordance with Figure 2, properly connect the test circuit. Make the
DC/DC working voltage value equal to the rated voltage value. Set the
electronic load to constant-current (or constant-resistance) load mode;
b) Adjust the load current, so that the product with the rated voltage is not less
than the rated power;
c) Continuously work for no less than 2 h. Every 0.5 h, record the output voltage
and the output current value; calculate the output power value.
5.3.4 Control error test
5.3.4.1 Voltage control error test
The test methods and steps are as follows:
a) In accordance with Figure 2, properly connect the test circuit. Set the
electronic load to constant-current (or constant-resistance) load mode;
b) Under the conditions of rated input and rated output, turn on the DC/DC; make
it work in a constant-voltage output state. The voltage is a certain set value
Uzo within the controlled range of the DC/DC;
c) Respectively adjust the input voltage to the minimum input voltage, the rated
input voltage and the maximum input voltage. Respectively adjust the output
load to 20% (or the minimum load given in the product technical documents),
50% and 100% of the load capacity under the current conditions. At this
moment, respectively measure the actual voltage Uz of the DC/DC. In
accordance with Formula (2), calculate the output voltage error:
b) Under the conditions of rated input, turn on the DC/DC; make it work under
the minimum load (load current is greater than zero);
c) Gradually adjust the DC input voltage to the overvoltage protection value or
the undervoltage protection value, until the DC/DC is turned off or the output
is limited;
d) Gradually adjust the DC input voltage from the overvoltage protection value
or the undervoltage protection value to the normal operating voltage range
and observe the DC/DC output status; or re-start the DC/DC under rated
conditions and observe its output status.
5.4.2 Output overvoltage and undervoltage protection test
5.4.2.1 Output overvoltage protection test
The test methods and steps are as follows:
a) In accordance with Figure 2, properly connect the test circuit. The output
terminal is connected to a DC voltage source;
b) Under the conditions of rated input, turn on the DC/DC. Set the output voltage
to the rated output voltage value;
c) Turn on the DC source at the output terminal; adjust the voltage source at the
output terminal to the output overvoltage protection value, until the DC/DC is
turned off or the output is limited;
d) Turn off the DC source at the output terminal and observe the DC/DC output
status; or re-start the DC/DC under rated conditions and observe its output
status.
5.4.2.2 DC output undervoltage protection test
The test methods and steps are as follows:
a) In accordance with Figure 2, properly connect the test circuit. Set the
electronic load to constant-resistance (or constant-voltage) load mode;
b) Under the conditions of rated input, turn on the DC/DC; make it work in the
output current limit state;
c) Reduce the resistance value of the electronic load (or reduce the voltage
setting value of the electronic load), so that the output voltage gradually
reaches the undervoltage protection value; observe the DC/DC output status;
d) Restore the electronic load resistance value to the rated load state (or set the
constant-voltage setting value to the DC/DC rated output voltage) and
observe the DC/DC output status; or re-start the DC/DC under rated
conditions and observe its output status.
5.4.3 Output short-circuit protection test
5.4.3.1 Short-circuit protection test before starting
The test methods and steps are as follows:
a) In accordance with Figure 2, properly connect the test circuit. Short-circuit the
DC/DC output DC positive and negative poles;
b) Under the conditions of rated input, turn on the DC/DC; check the DC/DC
status;
c) After the output short circuit is removed, observe its output status; or re-start
the DC/DC under rated conditions and observe its output status.
5.4.3.2 Short-circuit protection test during operation
The test methods and steps are as follows:
a) In accordance with Figure 2, properly connect the test circuit;
b) Under the conditions of rated input, turn on the DC/DC; make it in the rated
working state;
c) Short-circuit the output DC positive and negative poles; check the DC/DC
working status;
d) After the output short circuit is removed, observe its output status; or re-start
the DC/DC under rated conditions and observe its output status.
5.4.4 Overtemperature protection test
The DC/DC overtemperature protection test shall be performed in accordance with the
following methods:
---For air-cooled DC/DC, after the high-temperature operation test, continue to
gradually increase the temperature of test chamber to the over-temperature
protection value, observe and record the DC/DC working status. Restore the
test chamber to the temperature range, in which, the rated operation of the
DC/DC is possible, and the DC/DC can automatically restore the output or
restore the output after necessary human intervention.
---For liquid-cooled DC/DC, after the high-temperature operation test, gradually
increase the temperature of the coolant to the over-temperature protection
value, observe and record the DC/DC working status. Restore the temperature
5.5.4 Salt spray test
The salt spray test of the DC/DC shall be performed in accordance with the stipulations
of 5.5 in GB/T 28046.4-2011.
5.5.5 Vibration test
In accordance with the installation location, the vibration test of the DC/DC shall be
performed in accordance with the stipulations of 4.1 in GB/T 28046.3-2011.
NOTE: vibration test requires power-on test, which can be tested with small load.
5.5.6 Mechanical shock test
The mechanical shock test of the DC/DC under the non-working status shall be
performed in accordance with 4.2 in GB/T 28046.3-2011.
5.6 Electromagnetic Compatibility Test
5.6.1 Working status
When the DC/DC receives the electromagnetic compatibility test under the working
status, if there are no special requirements, the DC/DC works under the rated input
voltage and the rated output voltage, and the output power reaches 30% of the rated
power.
5.6.2 Electromagnetic immunity test
5.6.2.1 Electrostatic discharge immunity test
The test arrangement and test method shall comply with GB/T 19951.
5.6.2.2 Low-voltage electrical transient conduction immunity test along the
power line
The test arrangement and test method shall comply with the requirements of different
impulse tests on the low-voltage input power line in Chapter 4 of ISO 7637-2:2011.
5.6.2.3 Low-voltage conduction immunity test along the non-power line
The test arrangement and test method shall comply with the requirements of ISO 7637-
3:2016.
5.6.2.4 Anechoic chamber immunity test
The test arrangement and test method shall comply with the requirements of ISO
11452-2.
5.6.2.5 Bulk current injection (BCI) method immunity test
The test arrangement and test method shall comply with the requirements of ISO
11452-4.
5.6.2.6 Magnetic field immunity test
The test arrangement and test method shall comply with the requirements of ISO
11452-8:2015.
5.6.3 Electromagnetic emission disturbance test
5.6.3.1 Conducted emission disturbance test
The test arrangement and test method shall comply with the requirements of GB/T
18655-2018. The test shall be performed at the input port.
The voltage method is used to assess the characteristics of disturbance signals
transmitting along low-voltage power lines and high-voltage wiring harnesses.
The current probe method is used to assess the characteristics of disturbance signals
transmitting along low-voltage wiring harnesses.
5.6.3.2 Radiated emission disturbance test
The test arrangement and test method shall comply with the requirements of GB/T
18655-2018.
5.6.3.3 Low-voltage electrical transient conduction disturbance test along the
power line
The test arrangement and test method shall comply with the requirements of ISO 7637-
2:2011.
5.7 Electrical Safety Test
5.7.1 Insulation resistance test
When the DC/DC is not working, use an insulation resistance tester to measure the
insulation resistance of the DC/DC; apply a DC test voltage of 500 V and maintain a
steady-state value for 60 s, then, determine the insulation resistance.
5.7.2 Voltage resistance test
During the test, the terminals of the same independent circuit loop in the DC/DC shall
be short-circuited. In accordance with the voltage resistance value in Table 6, apply
the test voltage:
a) Between the terminal and the ground (enclosure);
b) Between circuits without electrical connection.
......

BASIC DATA
Standard ID GB/T 24347-2021 (GB/T24347-2021)
Description (Translated English) DC/DC converter for electric vehicles
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard T47
Classification of International Standard 43.080.01
Word Count Estimation 22,232
Date of Issue 2021-08-20
Date of Implementation 2022-03-01
Older Standard (superseded by this standard) GB/T 24347-2009
Drafting Organization Suzhou Inovance United Power System Co., Ltd., Beijing New Energy Automobile Co., Ltd., Huawei Technologies Co., Ltd., Shanghai Pandong Electric Technology Co., Ltd., China Automotive Technology Research Center Co., Ltd., Hangzhou Forte Technology Co., Ltd., Shanghai Weilai Automobile Co., Ltd., BYD Automobile Industry Co., Ltd., China Automotive Research Institute Automobile Inspection Center (Tianjin) Co., Ltd., Shenzhen Vmax New Energy Co., Ltd., Toyota Motor Investment (China) Co., Ltd., Delta Electronics Enterprise Management (Shanghai) Co., Ltd. , Pan-Asian Automotive Technology Center Co., Ltd., China FAW Co., Ltd., Alyons Automotive Research and Development (Shanghai) Co., Ltd., China Automotive Engineering Research Institute Co., Ltd., Qoros Automobile Co., Ltd., Chongqing Changan New Energy Automobile Technology Co., Ltd. Company, Zhengzhou Yutong
Administrative Organization National Automotive Standardization Technical Committee (SAC/TC 114)
Proposing organization Ministry of Industry and Information Technology of the People's Republic of China
Issuing agency(ies) State Administration for Market Regulation, National Standardization Administration