CN207133367U - The ageing test apparatus of vehicle-mounted DC/DC converters - Google Patents
The ageing test apparatus of vehicle-mounted DC/DC converters Download PDFInfo
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- CN207133367U CN207133367U CN201720668180.XU CN201720668180U CN207133367U CN 207133367 U CN207133367 U CN 207133367U CN 201720668180 U CN201720668180 U CN 201720668180U CN 207133367 U CN207133367 U CN 207133367U
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Abstract
The utility model provides a kind of ageing test apparatus of vehicle-mounted DC/DC converters, including：High-tension electricity modular converter, high-voltage alternating electric rectification is converted into high voltage direct current, and the both ends of the input side supplied to converter to be measured；Outlet side circuit, it will be exported after the outlet side series connection of the converter to be measured；Electric detection means is exported, detects the electric current and/or voltage of the outlet side circuit output；Input electric detection means, voltage of the detection supplied to the converter to be measured；Controller, the input connection output electric detection means and input electric detection means, output end connect the driver；Driver, input connect the controller, and output end is controlled s to the power supply inputted to the converter to be measured.
Description
Technical field
It the utility model is related to vehicle-mounted converter field, more particularly to a kind of degradation dress of vehicle-mounted DC/DC converters
Put.
Background technology
Vehicle-mounted DC/DC converters belong to automotive power electronic technology field, generally that electric automobile power battery is nominally defeated
The high voltage direct current (200~720VDC) gone out is transformed to low-voltage DC (12~48VDC), is widely used in electric automobile or mixed
In the secondary power supply module for closing electric automobile (EV＆HEV).And this patent is the degradation side on vehicle-mounted DC/DC converters
Case, the degradation being mainly used in before bulk article manufacture is offline, functionally by component or assembly quality dissatisfaction etc.
Substandard product screens, and belongs to vehicle electric power electronic manufacturing technology field.
In traditional degradation, usually using separate unit connection electronic load, the energy is so both wasted, reduces aging again
The efficiency of test.
Moreover, the domestic main pooled applications of DC/DC converters are in computer, industrial instrument, the neck such as space flight and automatic control equipment
Domain, especially 6~25W small-power industry rank lower pressure transducers it is most widely used.After 2000, with IC microelectric techniques
High speed development and PWM switching techniques tend to be ripe, DC/DC converters have been commercially produced in batches and power and switching frequency are fast
Speed lifting.But vehicle-mounted DC/DC converters aging technology is still within the products application stage of small-power low pressure, big work(at home
Rate high pressure aging technology also in blank and without formed can the application of actual mass product.
Utility model content
The technical problems to be solved in the utility model is how to realize the batch aging experiment of vehicle-mounted DC/DC converters.
In order to solve the above technical problems, present disclose provides a kind of ageing test apparatus of vehicle-mounted DC/DC converters, bag
Include：
High-tension electricity modular converter, high-voltage alternating electric rectification is converted into high voltage direct current, and is supplied to converter to be measured
The both ends of input side；
Outlet side circuit, it will be exported after the outlet side series connection of N number of converter to be measured；Wherein, N is any whole more than grade 2
Number；
Electric detection means is exported, detects the electric current and/or voltage of the outlet side circuit output；
Input electric detection means, electric current and/or voltage of the detection supplied to the converter to be measured；
Controller, according to the feedback of the output electric detection means and input electric detection means, export duty ratio corresponding
Pwm signal so that the converter to be measured works under specified aging current；
Driver, the pwm signal according to controller output is to defeated after the outlet side series connection of the converter to be measured
Go out power supply to be controlled.
In one of which embodiment, the controller includes constant current ring adjusting module, peak value comparison method module, cycle
Current limiting module；
The constant current ring adjusting module, entered based on the output electric detection means and/or the feedback for inputting electric detection means
Row constant current ring adjusts；
The peak value comparison method module, the input side current information based on the resulting converter to be measured carry out peak
It is worth current control；
The periodic current limits module, based on the input side current information of the resulting converter to be measured, by by
The individual cycle is limited electric current；
The input side current information obtains according to the turn ratio of the output electric detection means and the converter to be measured.
In one of which embodiment, the ageing test apparatus of described vehicle-mounted DC/DC converters also includes short-circuit protection
Module, according to the input side current information of the resulting converter to be measured, realize short-circuit protection.
In one of which embodiment, the ageing test apparatus of described vehicle-mounted DC/DC converters also includes overcurrent protection
Device, the feedback according to the detecting device for output current carry out overcurrent protection to the driver.
In one of which embodiment, the ageing test apparatus of described vehicle-mounted DC/DC converters also includes microprocessor,
The microprocessor connects the Enable Pin of the output electric detection means, input electric detection means and the controller respectively.
In one of which embodiment, the microprocessor, also by the controller Enable Pin to the controller
Switching frequency is controlled, so as to realize the control of constant pressure or constant current or invariable power.
In one of which embodiment, the ageing test apparatus of described vehicle-mounted DC/DC converters also includes the one or two pole
Pipe and the second diode, the input side of first diode connect the high-tension electricity modular converter, first diode
Outlet side is supplied to the converter to be measured, the input side of the outlet side circuit output to second diode, and described
The outlet side of two diodes is connected between outlet side and the converter to be measured of first diode.
In one of which embodiment, the ageing test apparatus of described vehicle-mounted DC/DC converters includes high-voltage region
With low-voltage region, at least provided with the high-tension electricity modular converter, and the high-tension electricity modulus of conversion in the high-voltage region
Circuit part between block and converter to be measured, the low-voltage region is at least provided with the outlet side circuit, the high voltage
It is electrically isolated between region and low-voltage region.
The disclosure considers simultaneously for degradation actual demand under the more vehicle-mounted DC/DC products immunization with gD DNA vaccine of set
Constant pressure and the current constant control requirement of every product to be aging, the high-low pressure of input-series and output-parallel mode is devised on hardware
Isolated topology circuit, while eliminate the power consumption heat-producing device such as electronic load, in embodiment, can also use self feed back and
The monitoring and diagnosis demarcating control program, employ startup function of regulation are circulated, running protection etc. under specified aging operating mode
Design, it ensure that the ideal effect of the reliability of aging of product process, security and energy-conservation.
Brief description of the drawings
Fig. 1 is the ageing test apparatus functional block diagram of vehicle-mounted DC/DC converters in the embodiment of the disclosure one；
Fig. 2 is the control schematic diagram of the ageing test apparatus of vehicle-mounted DC/DC converters in the embodiment of the disclosure one；
Fig. 3 is the schematic diagram of the ageing test apparatus of vehicle-mounted DC/DC converters in the embodiment of the disclosure one；
Fig. 4 is the schematic diagram of controller in the embodiment of the disclosure one.
Embodiment
The ageing test apparatus of vehicle-mounted DC/DC converters provided by the utility model is carried out below with reference to Fig. 1 to Fig. 4
Detailed description, it is the utility model optional embodiment, it is believed that those skilled in the art are not changing this practicality newly
In the range of type spirit and content, it can be modified and polished.
In order to introduce the device of disclosure offer, first it is introduced to following：
Existing DC/DC converters aging technology is mainly used in industrial circle and had the following disadvantages：
1), existing aging circuit design it is most with low power range (<1kw) low voltage product is main aging object, and pin
To the also no maturation of aging technology of high-power high voltage product (particularly automotive grade), and do not reach the other aging of automotive grade and want
Ask.But as electric powered steering EPS, electric brake EPB, the electrical equipment and electrical equipment such as electric air-conditioning EHVAC and start-stop ISG are progressively matched somebody with somebody
New-energy automobile is placed in, it is increasing to vehicle-mounted DC/DC power demands.
2), existing product is non-intelligentized control method design, mainly realizes on-off function and PWM arteries and veins using single switching device
The pure hardware circuit designs such as the harmonic wave communication function such as width modulation and LPF, lack the development and application of software controlling strategies,
Existing product technology and system schema belong to non intelligent type.
3), in order to avoid causing waste of energy using electronic load as far as possible, the series/parallel pattern of generally use is by energy
It is an energy conservation test technology to reclaim grid-connected design, but energy recovery efficiency, to the power grade sum of test product
The adaptability of amount and avoid circuit design iterations, and the convenience of practical operation is key problem in technology.Such as：Conventional different capacity
Grade or the connection in series-parallel pattern of varying number product need to compute repeatedly to form arrangement and poor universality, particularly point out
Be-in the case that serial or parallel connection pattern can not all realize that energy regenerating is grid-connected, it is also necessary to individually increase electronic load or tune
Die block realizes that pressure regulation is grid-connected.
4), existing ageing prod detection and control also rest on the schematic design phase, be far from setting in actual product
The function of OBD is realized on meter, let alone further relatively, the realization of the control function such as feedback and pulsewidth modulation；
5), existing ageing prod treats the startup function of ageing prod and is not coupled to complete machine control system synchronously also
In, be often divided into two steps perform and manual voltage regulation and rectification module at utmost saved so as to reach, energy recovery efficiency without
Method is accurately regulated and controled.
It can be seen that, it is contemplated that the actual demand of the DC/DC converter products of different capacity grade and different aging quantity, to enter
The reliability of one step enhancing aging stand control ring and the OBD and accuracy controlling of power circuit, improve energy recovery efficiency
And operability, the consideration in degradation stand adaptation power grade scope and quantity and cost optimization is widened, and use
The intelligent Control scheme of the disclosure is simultaneously applied in the degradation of actual product.
Present embodiments provide a kind of ageing test apparatus of vehicle-mounted DC/DC converters, can be directed to more than 1kW and more than
Vehicular high-power DC/DC converter products batch aging technology, the high electricity of output of vehicle mounted dynamic battery bag can also be directed to
Buckling is changed and concentrates on more than 300V aging of product experiment.
Including：
High-tension electricity modular converter, high-voltage alternating electric rectification is converted into high voltage direct current, and is supplied to converter to be measured
The both ends of input side；
Outlet side circuit, it will be exported after the outlet side series connection of the converter to be measured；
Export electric detection means, detect the electric current and/or voltage of the outlet side circuit output, it is illustrated that embodiment
In, especially include：
Detecting device for output current, detect the electric current of the outlet side circuit output；And output voltage detection means, inspection
Survey the voltage of the outlet side circuit output；
Input electric detection means, electric current and/or voltage of the detection supplied to the converter to be measured；Embodiment illustrated
In, especially including input voltage measurement device, voltage of the detection supplied to the converter to be measured；
Controller, according to the feedback of the output electric detection means and input electric detection means, export duty ratio corresponding
Pwm signal so that the converter to be measured works under specified aging current；
Driver, the pwm signal according to controller output is to defeated after the outlet side series connection of the converter to be measured
Go out power supply to be controlled.It can be seen that use overall control mode because aging current is small.
In one of which embodiment, driver is controlled by power device circuit to output power supply, the power
Device circuitry includes four power devices, and T1, T2, T3 and T4 respectively shown in Fig. 3, specific connected mode can be such as Fig. 3 institutes
Show, wherein, power device T1, T2, T3 and T4 can use field-effect transistor (Mosfet).
Because vehicle-mounted DC/DC converters need to configure the design objective of different automobile types, and form different power grades
Difference, while in view of the cost advantage of more DC/DC converters products aging simultaneously, therefore the input of this patent conceptual design
It is all adjustable with output voltage and electric current, so as to be suitable for the more of different capacity grade and varying number DC/DC products aging simultaneously
Aspect demand.So this embodiment introduces controller, detection means, driver etc..
In the embodiment of Fig. 1 signals, in low voltage starting block terminal, the detecting device for output current, output can be set
Voltage check device, input voltage measurement device, controller, driver and overcurrent protective device etc., the control system of Fig. 2 signals
Including the detecting device for output current, output voltage detection means, input voltage measurement device, controller, driver and mistake
Flow protection device.
In one of which embodiment, the controller includes constant current ring adjusting module, peak value comparison method module, cycle
Current limiting module；
The constant current ring adjusting module, entered based on the output electric detection means and/or the feedback for inputting electric detection means
Row constant current ring adjusts, and in embodiment, the feedback based on the detecting device for output current carries out constant current ring adjustment；It can
To have output current setting value and output electric current measure value including the second subtracter, respectively input, wherein, output electric current measure value
Can be direct measurement value, or conversion obtains；The outlet side of second subtracter exports the output current setting value and defeated
Go out the output current error signal of current detection value, be controlled according to the output current error, the control of constant current ring can be achieved.
In the embodiment of Fig. 4 signals, the output current error may be output to minimum value circuit.
The peak value comparison method module, the input side current information based on the resulting converter to be measured carry out peak
It is worth current control；In one of which embodiment, the peak value comparison method module can include the 3rd subtracter, and the described 3rd
The input input input electric cur- rent measure value of subtracter, another input inputs the output valve of minimum value circuit, described
Minimum value circuit distinguishes input and output voltage error and output current error, takes in both less error as the 3rd subtracter
Input, the 3rd subtracter determines peak point current according to input electric cur- rent measure value and the less error, and then exports
Controlled accordingly.Because its output can also react whether output current is constant current, so, it realizes constant current ring control jointly
System and peak value comparison method；In other optional embodiments, constant current ring adjusting module, which can also be exported individually, to be controlled.
The periodic current limits module, based on the input side current information of the resulting converter to be measured, by by
The individual cycle is limited electric current.In one of which embodiment, including the second comparator, its input side input input electricity respectively
Detected value and periodic current limit value one by one are flowed, passes through input electric cur- rent measure value and the comparison of periodic current limit value one by one, root
Exported according to comparative result, so as to realize control.
Constant current ring adjusting module, peak value comparison method module, periodic current limitation module can be inputted and defeated respectively
Go out, in the embodiment of Fig. 4 signals, it is combined together, and inputs to logical block and carries out judgement output, and it is according to described second
The output of comparator and the 3rd subtracter, corresponding pwm signal is produced, exported to driver.
The input side current information obtains according to the output electric detection means and/or input electric detection means, wherein
In a kind of embodiment, because the source of converter and the number of turn at secondary end are determination, so, the electrical parameter at both ends can pass through
The source of converter and secondary end turn ratio are converted into what is come, so as to which input side current information can be obtained according to detection means, and
Input current detecting device may not be detected.As long as realizing the acquisition of input side current information, no matter directly measuring or conversing
Come, without departure from the scope of protection of the utility model.
In one of which embodiment, the ageing test apparatus of described vehicle-mounted DC/DC converters also includes short-circuit protection
Module, according to the input side current information of the resulting converter to be measured, realize short-circuit protection.Specific embodiment
In, the second comparator, the second comparator difference input electric cur- rent measure value and current protection setting value, the second ratio can be included
Compared with the device current detection value and current protection setting value, according to driver, Ke Yishi described in comparative result output control
Existing short-circuit protection.
It can be seen that nominal mains electricity is converted to 400VDC through over commutation by 380VAC in the present embodiment, secondly by complete
Bridge switch copped wave, the present embodiment add the cycle on the basis of based on peak value comparison method module and constant current ring adjusting module
Current limiting module, the module make the current limit in cycle one by one to DC/DC full-bridge input side electric current, once excessively stream occurs
Situation, soon limitation driving PWM duty cycle, so as to limit output current, makes DC/DC converters remain operating in specified aging
Under current-mode, it not only ensure that the reliability of system but also taken into account functional requirement of the vehicle to DC/DC, further, since without using
Electronic load consumes DC/DC converter power outputs, is directly fed back to input, can cause input and AC/DC dc sources
Terminal voltage and current fluctuation, the present embodiment pass through microprocessor control by detecting output and the electric current and voltage change of input
Switching frequency processed reaches constant pressure, constant current and the stable operation of invariable power.
The present embodiment adds aging control on the basis of the adjusting module based on peak value comparison method module and constant current ring
The short circuit protection module of circuit processed, in the case of non-loaded startup, protection response speed is still not enough to both the above module
Protect ageing prod without damage.Therefore, high speed current foldback circuit all the way has been it is possible to additionally incorporate, that is, it is defeated to detect aging circuit full-bridge
Go out side electric current and high speed overcurrent protection is realized by hardware comparator, once short circuit overcurrent occurs, direct closing control circuit is simultaneously
Reporting fault, i.e., it is as follows：
In one of which embodiment, the ageing test apparatus of described vehicle-mounted DC/DC converters also includes overcurrent protection
Device, the feedback according to the detecting device for output current carry out overcurrent protection to the driver.
In one of which embodiment, the ageing test apparatus of described vehicle-mounted DC/DC converters also includes microprocessor,
The microprocessor connect respectively the detecting device for output current, output voltage detection means, input voltage measurement device, with
And the Enable Pin of the controller.
In one of which embodiment, the microprocessor, also by the controller Enable Pin to the controller
Switching frequency is controlled, so as to realize the control of constant pressure or constant current or invariable power.So pass through microprocessor controlling switch frequency
Rate reaches constant pressure, constant current and the stable operation of invariable power.
In one of which embodiment, the ageing test apparatus of described vehicle-mounted DC/DC converters also includes the one or two pole
Pipe and the second diode, the input side of first diode connect the high-tension electricity modular converter, first diode
Outlet side is supplied to the converter to be measured, the input side of the outlet side circuit output to second diode, and described
The outlet side of two diodes is connected between outlet side and the converter to be measured of first diode.DC/DC products can be achieved
HVDC feeder ear and the coupling control function of electric energy recovery end.
In one of which embodiment, the ageing test apparatus of described vehicle-mounted DC/DC converters includes high-voltage region
With low-voltage region, at least provided with the high-tension electricity modular converter, and the high-tension electricity modulus of conversion in the high-voltage region
Circuit part between block and converter to be measured, the low-voltage region is at least provided with the outlet side circuit, the high voltage
It is electrically isolated between region and low-voltage region.
Specifically optional embodiment can possess following effect to the disclosure：
1) bridge type topology circuit and current constant control strategy under high reliability current protection pattern, are employed, while is also examined
Consider various excessively streams or over-pressed operating mode and carried out self-test, protected, fault alarm and fast automatic restoration designing, including：Overload,
The operating modes such as overvoltage, under-voltage, short circuit, excess temperature；
2) in force, the ground wire of ageing test apparatus, utterly and relatively it is strictly separated, high voltage and low-voltage work(
Energy region has carried out being electrically isolated design, and the mutual inductance of aging stand and the interference free performance of self-induction has thus been effectively ensured；
3), power-supplying circuit software, that is, coupling control between power supply is increased, including：Feedback, filtering, constant pressure or perseverance
Stream；
4), fault logic diagnostic function, electric current, voltage and measured piece sensor are set；
5), mode of operation decision circuitry, including：Constant pressure, constant current or the switching of invariable power mode of operation；
6), ageing test apparatus is provided with supplementary controlled system, and the connection in series-parallel coupling for realizing product to be aging starts；
7) energy regenerating of closed loop, is realized with electric current loop compared to conventional open-loop ageing system design, this patent, can root
According to different capacity grade and product quantity to be aging configuration and in real time adjustment grid-connected voltage and energy recovery efficiency be maintained at 90%
More than.
In summary, the disclosure covers degradation actual demand under vehicle-mounted DC/DC products immunization with gD DNA vaccine for more, together
When consider constant pressure and the current constant control requirement of every product to be aging, input-series and output-parallel mode is devised on hardware
High and low voltage isolation topological circuit, while eliminate the power consumption heat-producing device such as electronic load, in embodiment, can also use
Self feed back and the monitoring and diagnosis demarcating control program, employ startup function of circulation regulation, are transported under specified aging operating mode
The designs such as row protection, ensure that the ideal effect of the reliability of aging of product process, security and energy-conservation.
Claims (8)
- A kind of 1. ageing test apparatus of vehicle-mounted DC/DC converters, it is characterised in that：Including：High-tension electricity modular converter, high-voltage alternating electric rectification is converted into high voltage direct current, and is supplied to the defeated of N number of converter to be measured Enter the both ends of side；Outlet side circuit, it will be exported after the outlet side series connection of N number of converter to be measured；Electric detection means is exported, detects the electric current and/or voltage of the outlet side circuit output；Input electric detection means, electric current and/or voltage of the detection supplied to the converter to be measured；Controller, the input connection output electric detection means and input electric detection means, output end connection driver；The driver, input connect the controller, and output end is controlled to the power supply inputted to the converter to be measured System.
- 2. the ageing test apparatus of vehicle-mounted DC/DC converters as claimed in claim 1, it is characterised in that：The controller bag Include constant current ring adjusting module, peak value comparison method module, periodic current limitation module；The constant current ring adjusting module, perseverance is carried out based on the output electric detection means and/or the feedback for inputting electric detection means Flow ring adjustment；The peak value comparison method module, the input side current information based on the resulting converter to be measured carry out peak value electricity Flow control；The periodic current limits module, based on the input side current information of the resulting converter to be measured, by all one by one Phase is limited electric current；The input side current information obtains according to the turn ratio of the output electric detection means and the converter to be measured.
- 3. the ageing test apparatus of vehicle-mounted DC/DC converters as claimed in claim 2, it is characterised in that：The controller is also Including short circuit protection module, the input side current information according to the resulting converter to be measured carries out short to the driver Protect on road.
- 4. the ageing test apparatus of vehicle-mounted DC/DC converters as claimed in claim 1, it is characterised in that：Also include excessively stream to protect Protection unit, the feedback according to the output electric detection means carry out overcurrent protection to the driver.
- 5. the ageing test apparatus of vehicle-mounted DC/DC converters as claimed in claim 1, it is characterised in that：Also include microprocessor Device, the microprocessor connect the enabled of the output electric detection means, input electric detection means and the controller respectively End.
- 6. the ageing test apparatus of vehicle-mounted DC/DC converters as claimed in claim 5, it is characterised in that：The microprocessor, Also the switching frequency of the controller is controlled by the controller Enable Pin, so as to realize constant pressure or constant current or permanent work( The control of rate.
- 7. the ageing test apparatus of vehicle-mounted DC/DC converters as claimed in claim 1, it is characterised in that：Also include the one or two Pole pipe and the second diode, the input side of first diode connect the high-tension electricity modular converter, first diode Outlet side be supplied to the converter to be measured, the input side of the outlet side circuit output to second diode is described The outlet side of second diode is connected between outlet side and the converter to be measured of first diode.
- 8. the ageing test apparatus of vehicle-mounted DC/DC converters as claimed in claim 1, it is characterised in that：Including high voltage region Domain and low-voltage region, changed at least provided with the high-tension electricity modular converter, and the high-tension electricity in the high-voltage region Circuit part between module and converter to be measured, the low-voltage region is at least provided with the outlet side circuit, the high electricity It is electrically isolated between intermediate pressure section and low-voltage region.
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| CN201720668180.XU CN207133367U (en) | 2017-06-09 | 2017-06-09 | The ageing test apparatus of vehicle-mounted DC/DC converters |
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| CN201720668180.XU CN207133367U (en) | 2017-06-09 | 2017-06-09 | The ageing test apparatus of vehicle-mounted DC/DC converters |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107064699A (en) * | 2017-06-09 | 2017-08-18 | 上海逸伏汽车电子科技有限公司 | The ageing test apparatus of vehicle-mounted DC/DC converters |
| CN110907846A (en) * | 2018-08-28 | 2020-03-24 | 比亚迪股份有限公司 | Test system and test method of DC/DC conversion module |
| CN112526275A (en) * | 2020-12-21 | 2021-03-19 | 中认英泰检测技术有限公司 | Self-adaptive electrical parameter testing system and method for quality safety monitoring |
| CN112925250A (en) * | 2021-03-05 | 2021-06-08 | 广州市微生物研究所有限公司 | Control method and control circuit for electrical parameter aging test of plasma air purifier |
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2017
- 2017-06-09 CN CN201720668180.XU patent/CN207133367U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107064699A (en) * | 2017-06-09 | 2017-08-18 | 上海逸伏汽车电子科技有限公司 | The ageing test apparatus of vehicle-mounted DC/DC converters |
| CN107064699B (en) * | 2017-06-09 | 2023-07-25 | 刘孝涛 | Aging test device of vehicle-mounted DC/DC converter |
| CN110907846A (en) * | 2018-08-28 | 2020-03-24 | 比亚迪股份有限公司 | Test system and test method of DC/DC conversion module |
| CN112526275A (en) * | 2020-12-21 | 2021-03-19 | 中认英泰检测技术有限公司 | Self-adaptive electrical parameter testing system and method for quality safety monitoring |
| CN112925250A (en) * | 2021-03-05 | 2021-06-08 | 广州市微生物研究所有限公司 | Control method and control circuit for electrical parameter aging test of plasma air purifier |
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| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Shenzhen Blue Sea Huateng Technology Co., Ltd. Assignor: Shanghai Yi Yi Automotive Electronic Technology Co., Ltd. Contract record no.: X2019440020010 Denomination of utility model: Aging Testing Device for Vehicle DC/DC Converter Granted publication date: 20180323 License type: Common License Record date: 20190911 |
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