GB/T 24347-2021 English PDF (GBT24347-2021)

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GB/T 24347-2021: DC/DC converter for electric vehicles
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 r...