JB/T 7821-1995 Avalanche rectifier tubes and components for motor vehicles UB series bridge avalanche rectifier components for motor vehicles
Some standard content:
Mechanical Industry Standard of the People's Republic of China
Avalanche Rectifier Tubes and Components for Motor Vehicles
UB Series Bridge Avalanche Rectifier Components for Motor Vehicles 1 Subject Content and Scope of Application
JB/T7821-1995
This standard specifies the technical requirements, test methods, inspection regulations, marking, packaging and storage of environmentally rated UJB series bridge avalanche rectifier components for motor vehicles.
This standard applies to bridge avalanche rectifier components for motor vehicles such as automobiles and tractors, and also to bridge avalanche rectifier components (hereinafter referred to as components) fixed on internal combustion engines and used in conjunction with AC generators. 2 Reference standards
GB4937
GB4938
JB/T6305
ZBT35001
JB4159
JB/T7820-95
JB2864
3 Technical requirements
3.1 Model
Mechanical and climatic test methods for discrete semiconductor devices Acceptance and reliability of discrete semiconductor devices
Test method for heat sink for power semiconductor deviceUQ series bridge rectifier assembly for motor vehicle
Basic technical conditions for automotive electrical equipment
General technical conditions for tropical electrical products
ZB series 15A to 50A avalanche rectifier for motor vehiclePlating and chemical treatment layer for automobile
Test method for power semiconductor moduleThe model of rectifier three-phase bridge assembly shall comply with the provisions of Article 3.2.1 of JB/T6305. Example: The electrical connection form of the assembly is shown in Figure 1, the DC output current of the assembly is 75A, and the maximum ambient temperature is 95℃ (H grade). The model of this assembly shall be UBS75H.
3.2 The maximum rating of the auxiliary rectifier unit shall comply with Table 4 of JB/T6305. 3.3 The assembly shall be manufactured according to the drawings and design documents approved by the prescribed procedures, and the limit value and electrical characteristics of each rectifier in the assembly shall comply with the corresponding discrete device standards.
Approved by the Ministry of Machinery Industry on November 24, 1995
Implemented on July 1, 1996
UB series components are of Class I quality rating. 3.4 Limiting values (absolute maximum ratings)
The limiting values of components shall comply with the requirements of Tables 1 and 2. No.
Working environment temperature
Limit value
(Cooling wind speed 5m/s)
Storage temperature
Maximum equivalent junction temperature
Reverse repetitive peak voltage
Component DC output current
5min overload current
Reverse non-repetitive surge current (single tube), Tc=25℃tw=10ms, exponential waveform, duty cycle 1%
JB/T7821-1995
Symbol unit
The derating relationship curve between case temperature and forward average current is shown in Figure 2: Iea)
Note: When the working environment temperature is higher than Tbra, the component should be used at a derating rate. Table 2
Component installation thread diameter
Tightening force
3.5 Electrical characteristics
Minimum value
Threak
The characteristic values of the components shall comply with the provisions of Table 3. All characteristic values in the table are upper limit values. 60
Characteristics and conditions
Forward peak voltage
When the peak current is 100A
Maximum voltage
Reverse repetitive peak current,
VR=14V(A grade)
VR28V(B grade)
T,=25℃, when there is no forward dissipation
UB40~UB60,T,=150C
UB75~UB150,
T,=175℃
VRRM=14V(A grade),
VRM=28V(B grade)
When there is no forward dissipation
Avalanche breakdown voltage 1,
T,=25℃,
I=100mA
Avalanche breakdown voltage 2,
T,=150C,
Exponential pulse wave,
t=80μs,
Duty cycle 1%
Insulation withstand voltage 1min
Component thermal resistance
Environment reference point
Grade A VonR
Batch inspection and periodic inspection
Batch inspection
JB/T7821-1995
Given by the manufacturer
Each batch of products shall be inspected batch by batch according to Table 4. All inspection items are non-destructive. Table 4
Inspection items
Electrical characteristics
Inspection method
Visual inspection under normal lighting and normal vision,
2.4.1 Level 1 and
2.4.3 Level 1 of JB4159
JB/T6305
JB/T7820
Appendix C Appendix D
Inspection requirements
Marking is clear, surface coating No falling off
or damage, no loosening of fasteners, no cracks in insulating
Conform to Table 2
Conform to Table 2
AQL(I)
4.2 Cycle test
JB/T7821-1995
Cycle test is carried out according to Table 5, and the test items marked with (D) are destructive. All test items should be tested periodically for at least one batch of components every year. Solderability test should be carried out on a batch of components every three months. Table 5
Tests marked with (D) are destructive tests
Inspection or test
Dimensions
Mounting hole position
Tightening torque
Reverse repetitive peak current
Functional test
Final test:
Forward peak voltage
Reverse peak current
Weldability
(Applicable only to welding end
Insulation withstand voltage
Overload current
Final test
Forward peak voltage
Reverse peak current
Resistance to welding heat (D)
(Applicable only to welding end
Final test:
Forward peak voltage
Reverse peak current||tt t||Temperature change
Follow:
a. Cavity device
b. Non-cavity device
Appearance inspection
Steady-state heat diffusion
Final test:
Forward peak voltage
Reverse peak current
Reference standard
JB/T6305
Appendix C
GB4937
JB/T6305
Appendix D
Appendix B
GB4937
GB4937
GB4937
JB4159
GB4938
JB/T6305
Appendix C
T,- 25℃
Check with special tool
Check fasteners with force wrench
T. value according to Table 1
Wind speed 5m/s,
Lo according to rated value
Tinning method:
Solder 230±5℃
Immerse 2±0.5,
AC end and Add
voltage between positive and negative plates, all diodes and plates
open circuit, 550V
5min, 25℃
wind speed 5m/s
-40~i75℃
5 cycles
Fluorine oil pressurized leak detection
55℃24h
Relative humidity 90%~-98%||tt| |USLThe upper limit value in Table 3
The maximum value of the inspection requirement
Meet the design
Drawing requirements
No looseness, no slippage, meet
Meet Table 2
≤2USL
≤1.1USL
≤2USL
Good wetting
No flashover and short circuit
≤1.1USL
≤2USL
Meet Table 3
≤1.1USL
≤2USL
Surge rate≤0.1
Pacm*/s
Same as Table 4
≤1.1USL
≤2USL
≤1.1USL
≤1.1USL
Inspection or test
Final test:
Forward peak voltage
Reverse peak current
Electrical durability\
(working life)
Final test:
Forward peak voltage
Reverse peak current
Commercial storage
Final test:
Forward peak voltage
Reverse peak current
Reverse non-repetitive surge current
Final test ：
Forward peak voltage
Reverse peak current
IsRse1
JB/T78211995
Continued Table 5
Cited standards
ZBT35001
GB4938
GB4937
JB/T7820
Appendix D
On the generator
1000h,
Appendix B2.2
o=0.8Lomnx
Resistive load
175-gc
1000±30h
25℃, exponential pulse wave,
tw=10ms, duty cycle 1%
10 pulse waves
150℃, exponential pulse wave,
tw=80μs, duty cycle 1%,
10 pulse waves
Maximum value of inspection requirement
≤1.1USL
≤2U SL
≤1.1USL
≤1.1USL
≤2USL
Specially in accordance with the provisions of Table 3
≤1.1USL
≤2USL
Note: 1) This test is first conducted at n=3, c=0, and a 500h test is conducted. If e-1, then additional samples are added at n=6, c1, and another 500h test is conducted. 5
Characteristic curves (not for inspection)
The following curves should be given in the enterprise standards and product manuals. 5.1 Derating curve of ambient temperature and forward average current (when the wind speed is 5m/s). Forward volt-ampere characteristic curve.
Relationship curve of transient thermal impedance and time. Relationship curve of forward surge current and frequency. Relationship curve of maximum forward dissipated power, forward average current and conduction angle. Relationship curve of reverse surge current and reverse pulse duration. Relationship curve between reverse peak power dissipation and reverse duration. Relationship curve between reverse peak energy and reverse pulse duration. Reverse volt-ampere characteristic curve after breakdown (relationship between IeSM and V(BR)1, V(BR>2 and dynamic resistance). IRsm waveform.
Relationship curve between component thermal resistance and wind speed and wind resistance. Marking, packaging, storage
Marking on the product
Product model:
Manufacturer name code or trademark;
JB/T78211995
Terminal marking: AC terminal is represented by A, B, C, O, DC output plate is marked with red, black (green), factory date or inspection batch identification code; mark for matching generator model is given according to user requirements. Marking on packaging and instructions
6.1.1 Contents (except item c);
Number of this standard;
Moisture-proof and rain-proof mark.
6.2 Packaging
The packing box should be firm and the products should not move in the box to avoid damage during transportation. The total weight of the product after packing shall generally not exceed 50kg. 6.2.1
The packing box should contain a packing list and a product factory certificate. 6.2.2Www.bzxZ.net
During storage, the product must not be exposed to moisture, corrosion, heavy pressure, collision, and must not come into contact with acidic and alkaline corrosive substances and organic solvents. 6.4 Ordering information
Unless otherwise specified, the following information is required at least for ordering components: a.
Accurate model;
Appearance drawing ;
Quality assessment category is Class 1;
Others.
Batch range
9—15
16—25
51—90
91-150
151-280
281—500
501-1200
1201—3200
3201-10000
10001—35000
35001—150000
This table belongs to general inspection level 1,
②c: qualified judgment number; r: unqualified judgment numberJB/T7821 -1995
Appendix A
AQL sampling table
(Supplement)
The arrow indicates that the first sampling plan should be used. If the sample size at the corresponding point pointed by the arrow is equal to or greater than the batch, the batch should be inspected 100%.
B1 Overview
JB/T78211995
Appendix B
Component thermal resistance test method
(Supplement))
The avalanche rectifier components for motor vehicles generally adopt three-phase bridge connection, sometimes with additional circuits. The components are welded with the heat sink, and the heat sink (i.e., the shell) and the hot plate work in a forced air cooling environment. This test takes the components of the ordinary bridge rectifier circuit as an example to illustrate the thermal resistance test method of the junction to the environmental reference point.
B2 Basic requirements
B2.1 Thermal resistance test should be carried out under thermal equilibrium conditions. If the time from power application to measurement is doubled and the change in the measurement result is not greater than the specified error, thermal equilibrium can be considered to have been achieved. B2.2 Environmental conditions
B2.2.1 The component is tested in the duct. The wind speed in the duct is 5m/s. The inlet air temperature is taken as specified (L-level, M-level or H-level). The duct should have insulation and heat preservation layers, heating devices, constant temperature facilities and instruments for measuring wind speed, wind temperature and wind resistance. For details, see Article 2.1 of GB8446.2. B2.2.2 The duct is a circular tube shape with a length of 5m. The distance between the component and the inner wall of the duct is 5mm. Other requirements are shown in Figure B. Figures B1 and B2 are components of a single-layer heat sink and a double-layer heat sink, respectively. R-R,=R,R,=5mm, point A is the ambient temperature reference point, T., T, are the inlet and outlet wind temperature gauges, V is the anemometer, and P is the differential pressure gauge (wind resistance gauge).
JB/T7821-1995
B2.2.3 After the component is installed, before power is turned on, the temperatures of T., T, should be kept consistent. B3 The thermal resistance of the component is defined as the average thermal resistance of the three pairs of chips in the component (see B7.3) B4 The thermal resistance calculation formula:
Where: T,--ambient reference point temperature, ℃; T()---equivalent junction temperature measured by the thermistor parameter method; P--power loss measured by the wattmeter.
B5 Measurement circuit
Adjustable constant current source, this power supply should be able to output a load current I that makes the junction temperature of the chip in the measured component reach the rated junction temperature. The DC thermal current that monitors the junction temperature in the short interval when the load current is periodically interrupted. S;—Electronic switch that periodically interrupts the load current I. Pw-Wattmeter that indicates the power dissipated by I in the junction. Pv-—Voltmeter and tap switch for measuring thermistor voltage, which can measure the thermistor voltage of each rectifier tube separately. B6 Precautions
B6.1 When the component adopts a heat sink, when the load current I is converted to the reference current I, due to the transient voltage generated by the excess charge carriers, the thermistor voltage cannot be measured by Pv before the transient voltage disappears. It should be delayed for 0.5ms before measurement. B6.2 Thermistor current is selected as 1% of the component output current I. B6.3 The wire connecting the measured component should be as short as possible, the contact resistance should be as small as possible, and the cross-sectional area of the wire should be adapted to the current passing through. B7. Measurement procedure
B7.1 Use the method in Appendix A of JB6307.3 to measure the average thermal slope curve of the measured component. B7.2 Place the tested component in the air duct that complies with B2.2, fix it firmly, connect it with wires according to Figure B1, and ventilate and heat it. B7.3 After S: and S. are respectively directed to A and B, close S, heat the two rectifier tube chips 3 and 4 of the tested component, and after thermal equilibrium, Sz and S are respectively directed to B, D and A, E to measure the junction temperature of chips 3 and 4 and record the values of T. and P. After recording is completed, disconnect S, and direct S and S. to B, C or A, C respectively, repeat the above process, measure the junction temperature of chips 5, 6 and 1, 2 respectively, and take T., P, and T, of each chip.The average value of three records is used to calculate the thermal resistance value according to formula B1.
C1 Purpose
JB/T7821-1995
Appendix C
Component Function Test Method
(Supplement)
Under specified conditions, the rectification function of the rectifier component is tested according to the following circuit. G
C2 Test Conditions
Ambient temperature is in accordance with the corresponding value in Table 1;
Wind speed: 5m/s. The requirements for the wind tunnel are in accordance with B2.2.2. h.
C3 Test Procedure
Thermistor voltage V
a. Adjust the measurement conditions to the requirements of C2;
b. Close K and K to make the output of the tested component Io rated value. Adjust R to make the voltmeter indicate 14V (or 28V). After 3 minutes, disconnect K, K, and close K. , K.. Make the reverse peak voltage of 14V (or 28V) applied to the component for 10ms, adjust R, output IsM, disconnect K2, K., close K,, K, for 1min, repeat the above process for a total of 6min and then remove the component; test IRRm and VFM after the room temperature recovers for 30min; d. After K,, K; disconnect for the last two times, measure the junction temperature of each tube. The junction temperature measurement time shall not exceed 1s each time. 21
JB/T7821-1995
Appendix D
Component overload test method
(Supplement)
Purpose: Under specified conditions, test the ability of the component to withstand 5min overload current. The circuit schematic is the same as that of functional test C1.
Ambient temperature is 25℃, and other conditions are the same as those of functional test C2. D4
Test procedure
Adjust the test conditions to meet D3;
According to the procedure of C3b, make the component pass forward through Icov) and apply reverse voltage for 5 minutes, and monitor the junction temperature (should not exceed D5. After the test, restore at 25℃ for 2 hours, and measure VpM and IsRM1. Additional remarks:
This standard is proposed and managed by the Xi'an Power Electronics Technology Research Institute of the Ministry of Machinery Industry. This standard was drafted by Baoding Radio Experimental Factory, Shanghai Automotive Electrical General Factory, Changsha Automotive Electrical Research Institute, Xiangfan Instrument Component Factory, Xuzhou Rectifier Factory, and Jinhua Semiconductor Device Factory. The main drafters of this standard are: Zhang Hongzhuan, Shen Xingzu, Song Shimin, Li Weiyang, Li Wande, Zhang Zhenqin, and Jin Huangfu. 22
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