CN112698993B - Method and device for measuring load of hard disk backboard - Google Patents
Method and device for measuring load of hard disk backboard Download PDFInfo
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Abstract
The invention discloses a method and a device for measuring the load of a hard disk backboard, wherein the method comprises the following steps: determining load current according to preset conditions by the upper computer and sending a control signal for configuring the load current to the signal expansion card through a communication interface of the upper computer; the signal expansion card decodes the control signal by using the microchip shunt circuit and sends the control signal to the corresponding pulling load card through the universal serial bus; configuring, by the pull-loading card, an input current of a hard disk connected to the pull-loading card as a load current based on a control signal, and collecting an actual working current and a working voltage of the hard disk to feed back to the signal expansion card as a collected signal; the signal expansion card uses a microchip to combine codes to acquire signals and feed the signals back to an upper computer; and extracting and processing the actual working current and working voltage from the acquired signals by the upper computer to generate a load measurement report. The invention can simultaneously carry and measure a plurality of hard disks on the single hard disk backboard, thereby improving the measurement accuracy and efficiency.
Description
Technical Field
The present invention relates to the field of storage, and in particular, to a method and an apparatus for measuring a load of a hard disk backplane.
Background
With the development of short videos, large data and cloud computing applications, generated data is more and more, the storage requirement on a server is particularly higher and higher, the number of hard disks is also more and more, and the current is also higher and more. When the hard disk is normally operated and powered on, the loss on the current transmission path becomes large. At present, in order to ensure the reliability of power supply, actual complete machine test is performed at each electric equipment end, and the reliability of the electric equipment is verified.
In the prior art, a hard disk with the largest power consumption is selected according to a product list during design, and compatibility test, pressure test and the like are performed. Meanwhile, carrying out a pull load test on a single power supply guide rail of the hard disk, if relevant conditions do not occur in the whole test process, defaulting to design to meet the requirements, and normally delivering the hard disk; or measuring the through-current condition of the whole cable according to the designed power supply cable, and evaluating the power supply capacity. However, the testing method is complex, the limit of a single hard disk interface and the loss of a backboard cannot be determined, and the method is only compatible with the single hard disk pull load test.
Aiming at the problems that the test means in the prior art is complex and only a single hard disk can be pulled, no effective solution is available at present.
Disclosure of Invention
In view of this, an object of the embodiments of the present invention is to provide a method and an apparatus for measuring a load of a hard disk backplane, which can simultaneously pull and measure a plurality of hard disks on a single hard disk backplane, thereby improving measurement accuracy and efficiency.
Based on the above purpose, a first aspect of the embodiments of the present invention provides a method for measuring a load of a hard disk backplane, including the following steps:
determining load current according to preset conditions and sending a control signal for configuring the load current to a signal expansion card through a communication interface of the upper computer;
the signal expansion card decodes the control signal by using the microchip shunt circuit and sends the control signal to the corresponding pulling load card through the universal serial bus;
configuring the input current of a hard disk connected to the pull-loading card into a load current by the pull-loading card by using a micro-control unit based on a control signal, and collecting the actual working current and working voltage of the hard disk to serve as a collection signal to be fed back to a signal expansion card;
the signal expansion card acquires signals by using microchip combining codes and feeds the signals back to an upper computer;
and extracting and processing the actual working current and the actual working voltage from the acquired signals by the upper computer to generate a load measurement report.
In some embodiments, configuring, by the load card, an input current of a hard disk connected to the load card as a load current based on the control signal using a micro control unit includes:
converting the control signal into a digital signal of the load current by using a micro-control unit so as to send the digital signal to a load pulling module;
and converting the digital signal of the load current into an analog signal by the load pulling module to be used as the input current of the hard disk.
In some embodiments, each of the pull load cards has a plurality of pull load modules disposed thereon, the plurality of pull load modules configured to work together to test the same hard disk or work separately to test a plurality of different hard disks.
In some embodiments, the load-pulling module includes an operational amplifier and a field effect transistor and is configured to adjust to pull the load current using a negative feedback approach.
In some embodiments, the pull-loading module further comprises a comparator and a transistor that limit the maximum operating voltage of the fet.
In some embodiments, the pull-up module further comprises a precision resistor that provides a pull-down resistance for the operational amplifier.
In some embodiments, the collecting, by the load card, the actual operating current and operating voltage of the hard disk using the micro control unit to be fed back to the signal expansion card as a collected signal comprises:
the voltage and current detection module collects the actual working current and working voltage of the hard disk through the load module;
and converting the actual working current and working voltage into digital signals serving as acquisition signals by using a micro-control unit so as to send the digital signals to the signal expansion card.
A second aspect of the embodiments of the present invention provides a hard disk backplane load measurement apparatus, including:
a processor; and
a memory storing program code executable by the processor, the program code when executed performing the steps of:
determining load current according to preset conditions by the upper computer and sending a control signal for configuring the load current to the signal expansion card through a communication interface of the upper computer;
the signal expansion card decodes the control signal by using the microchip shunt and sends the control signal to the corresponding pull load card through a universal serial bus;
configuring, by the pull-loading card, an input current of a hard disk connected to the pull-loading card as a load current based on a control signal, and collecting an actual working current and a working voltage of the hard disk to feed back to the signal expansion card as a collected signal;
the signal expansion card uses a microchip to combine codes to acquire signals and feed the signals back to an upper computer;
and extracting and processing the actual working current and working voltage from the acquired signals by the upper computer to generate a load measurement report.
In some embodiments, configuring, by the load card, an input current of a hard disk connected to the load card as a load current based on the control signal using a micro control unit includes:
converting the control signal into a digital signal of load current by using a micro-control unit so as to send the digital signal to a load pulling module;
and converting the digital signal of the load current into an analog signal by the load pulling module to be used as the input current of the hard disk.
In some embodiments, the load-pulling module comprises an operational amplifier and a field effect transistor and is configured to adjust to pull the load current using a negative feedback manner; the circuit also comprises a comparator and a triode which limit the maximum working voltage of the field effect transistor, and a precision resistor which provides a pull-down resistor for the operational amplifier.
The invention has the following beneficial technical effects: according to the method and the device for measuring the load of the hard disk backboard, the upper computer determines the load current according to the preset condition and sends the control signal for configuring the load current to the signal expansion card through the communication interface; the signal expansion card decodes the control signal by using the microchip shunt circuit and sends the control signal to the corresponding pulling load card through the universal serial bus; configuring, by the pull-loading card, an input current of a hard disk connected to the pull-loading card as a load current based on a control signal, and collecting an actual working current and a working voltage of the hard disk to feed back to the signal expansion card as a collected signal; the signal expansion card acquires signals by using microchip combining codes and feeds the signals back to an upper computer; the technical scheme that the upper computer extracts and processes actual working current and working voltage from the collected signals to generate the load measurement report can simultaneously pull and load and measure a plurality of hard disks on the single hard disk backboard, and measurement accuracy and efficiency are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic flow diagram of a method for measuring a load of a hard disk backplane according to the present invention;
fig. 2 is a schematic view of an overall structure of the hard disk backplane load measurement method provided by the present invention;
fig. 3 is a detailed structural schematic diagram of the hard disk backplane load measurement method provided by the present invention;
fig. 4 is a schematic structural diagram of a load pulling module of the hard disk backplane load measurement method provided by the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following embodiments of the present invention are described in further detail with reference to the accompanying drawings.
It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are used for distinguishing two entities with the same name but different names or different parameters, and it should be noted that "first" and "second" are merely for convenience of description and should not be construed as limitations of the embodiments of the present invention, and they are not described in any more detail in the following embodiments.
In view of the foregoing, a first aspect of the embodiments of the present invention provides an embodiment of a hard disk backplane load measurement method for simultaneously pulling and measuring multiple hard disks on a single hard disk backplane. Fig. 1 is a schematic flow chart of a hard disk backplane load measurement method provided by the present invention.
The method for measuring the load of the hard disk backboard, as shown in fig. 1, comprises the following steps:
step S101, determining load current according to preset conditions by an upper computer and sending a control signal for configuring the load current to a signal expansion card through a communication interface of the upper computer;
step S103, the signal expansion card decodes the control signal by using the microchip shunt circuit and sends the control signal to the corresponding pull load card through the universal serial bus;
step S105, configuring the input current of the hard disk connected to the load card into a load current by the load card by using the micro-control unit based on the control signal, and collecting the actual working current and working voltage of the hard disk to serve as a collection signal to be fed back to the signal expansion card;
s107, the signal expansion card acquires signals by using microchip combining codes and feeds the signals back to an upper computer;
and step S109, extracting and processing the actual working current and the actual working voltage from the acquired signals by the upper computer to generate a load measurement report.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), a Random Access Memory (RAM), or the like. Embodiments of the computer program may achieve the same or similar effects as any of the preceding method embodiments to which it corresponds.
In some embodiments, configuring, by the pull-up card, an input current of a hard disk connected to the pull-up card to a load current based on the control signal using a micro control unit includes:
converting the control signal into a digital signal of the load current by using a micro-control unit so as to send the digital signal to a load pulling module;
and converting the digital signal of the load current into an analog signal by the load pulling module to be used as the input current of the hard disk.
In some embodiments, each of the pull load cards has a plurality of pull load modules disposed thereon, the plurality of pull load modules configured to work together to test the same hard disk or work separately to test a plurality of different hard disks.
In some embodiments, the load-pulling module includes an operational amplifier and a field effect transistor and is configured to adjust to pull the load current using a negative feedback approach.
In some embodiments, the pull-up module further comprises a comparator and a transistor that limit the maximum operating voltage of the fet.
In some embodiments, the pull-up module further comprises a precision resistor that provides a pull-down resistance for the operational amplifier.
In some embodiments, the collecting, by the load card, the actual operating current and operating voltage of the hard disk using the micro control unit to be fed back to the signal expansion card as a collected signal comprises:
the voltage and current detection module collects the actual working current and working voltage of the hard disk through the pull load module;
and converting the actual working current and working voltage into digital signals serving as acquisition signals by using a micro-control unit so as to send the digital signals to the signal expansion card.
The following further illustrates embodiments of the invention in terms of specific examples. Referring to fig. 2, taking a single 4-port backplane as an example, the interaction mode of the upper computer, the signal expansion card and the pull load card is as follows:
the single pull-load card is inserted on the hard disk backboard, and the interface of the pull-load card adopts a general SAS or SATA interface and is directly connected on the hard disk backboard. The pull card is connected with the upper computer through the signal expansion card, and the signal expansion card decodes and distributes signals input by the upper computer to the pull cards below. During measurement, programs are set by the upper computer to correspond to different load currents, so that the function of carrying different currents by the carrying card is realized. The pulling load card collects the pulling load current information and the current voltage information and uploads the current information and the voltage information to the upper computer. And the upper computer realizes the automatic processing of data and the generation of a report through programming.
The specific structure of which is shown in fig. 3. The upper computer can write a test program, corresponding control data of province is output to the lower end through the communication interface aiming at the pull load condition of the hard disk, and the pull load module is controlled to carry out the pull load test of current. Meanwhile, the returned test data are sequenced and coded, and a test report is automatically generated, so that the test time is saved.
The signal expansion card comprises an input serial port, a MicroChip system and different communication USB interfaces. The input serial port mainly receives a control signal sent by an upper computer and transmits the control signal to the Microchip microsystem. Meanwhile, data returned by the test are transmitted to the upper computer. For a control signal input by an upper computer, after being received by an input serial port, the Microchip Micro system decodes the control signal and distributes information to different USB ports respectively, and the USB ports transmit the information to a pull-load card through a Micro USB wire. Meanwhile, aiming at the information of different pull-load cards input by the USB port, the MicroChip system transmits the information to an upper computer for processing through combining coding.
The load card comprises a communication interface, an MCU (single chip microcomputer/micro control unit), a load module and a voltage/current detection module. The communication interface transmits the signal output by the signal expansion card to the MCU, and the MCU outputs a corresponding digital signal to be transmitted to the pulling load module after processing, so that the pulling load module pulls out different current information; and meanwhile, the voltage and current information obtained by the MCU is output to the expansion module and finally transmitted to the upper computer. The MCU correspondingly outputs different current information to the load-pulling module to enable the load-pulling module to pull and load different current information. And meanwhile, the voltage/current information labels input by the voltage/current detection module are processed and then transmitted. The voltage/current detection module is mainly used for monitoring the voltage and the current of the pulling load module and inputting the voltage and the current to the MCU.
Different current gears are selected through the MCU, after conversion is carried out through the DA converter, the current gears correspond to different reference voltages (Vref 1), the current gears are connected to the positive electrode of the operational amplifier, the negative electrode of the operational amplifier is connected between the precision resistor R0 and the MOS Q0, and the MOS Q0 is driven to be in an open state through comparison, so that different current states are pulled out.
The circuit principle of the pull-load module is shown in fig. 4. The load pulling module connects the output voltage of the DA (analog-to-digital) converter to the positive pole of the operational amplifier as the reference voltage Vref1 of the operational amplifier. And converting the current detected by the precision resistor into a voltage Vfb, connecting the voltage Vfb to the negative electrode of the operational amplifier U0, and driving the starting of the rear end Q0 by differentiating. The two form a negative feedback system to control the output back end to correspondingly pull out the corresponding current, thereby realizing the pull-loading of different currents.
The comparator U1 is set mainly for the purpose of protecting Q0. After the allowed Q0 is set through Vref and the voltage corresponding to R0 when the maximum current passes, the derating coefficient is 80% of the derating coefficient commonly used in the industry. When the voltage of Vfb is greater than the set Vref, it represents that the maximum current passing at this time exceeds the maximum current allowed by Q0. At this moment, the comparator U1 outputs a high level to control the triode Q1 to be opened, so that the Q0 is closed, and the phenomenon that the Q0 is burnt due to overlarge current is avoided. Therefore, the condition that the pulling load card is burnt by misoperation in the using process is avoided.
It can be seen from the above embodiments that, in the hard disk backplane load measurement method provided by the embodiments of the present invention, the upper computer determines the load current according to the preset condition and sends the control signal configuring the load current to the signal expansion card through the communication interface thereof; the signal expansion card decodes the control signal by using the microchip shunt circuit and sends the control signal to the corresponding pulling load card through the universal serial bus; configuring, by the pull-loading card, an input current of a hard disk connected to the pull-loading card as a load current based on a control signal, and collecting an actual working current and a working voltage of the hard disk to feed back to the signal expansion card as a collected signal; the signal expansion card uses a microchip to combine codes to acquire signals and feed the signals back to an upper computer; the technical scheme that the upper computer extracts and processes actual working current and working voltage from the collected signals to generate the load measurement report can simultaneously pull and load and measure a plurality of hard disks on the single hard disk backboard, and measurement accuracy and efficiency are improved.
It should be noted that, the steps in the embodiments of the hard disk backplane load measurement method described above may be intersected, replaced, added, or deleted, and therefore, the hard disk backplane load measurement method based on these reasonable permutation and combination transformations shall also fall within the protection scope of the present invention, and shall not limit the protection scope of the present invention to the embodiments.
In view of the above, a second aspect of the embodiments of the present invention provides an embodiment of a hard disk backplane load measuring device for simultaneously pulling and measuring multiple hard disks on a single hard disk backplane. Hard disk backplate load measurement device includes:
a processor; and
a memory storing program code executable by the processor, the program code when executed performing the steps of:
determining load current according to preset conditions by the upper computer and sending a control signal for configuring the load current to the signal expansion card through a communication interface of the upper computer;
the signal expansion card decodes the control signal by using the microchip shunt circuit and sends the control signal to the corresponding pulling load card through the universal serial bus;
configuring, by the pull-loading card, an input current of a hard disk connected to the pull-loading card as a load current based on a control signal, and collecting an actual working current and a working voltage of the hard disk to feed back to the signal expansion card as a collected signal;
the signal expansion card uses a microchip to combine codes to acquire signals and feed the signals back to an upper computer;
and extracting and processing the actual working current and the actual working voltage from the acquired signals by the upper computer to generate a load measurement report.
In some embodiments, configuring, by the load card, an input current of a hard disk connected to the load card as a load current based on the control signal using a micro control unit includes:
converting the control signal into a digital signal of the load current by using a micro-control unit so as to send the digital signal to a load pulling module;
and converting the digital signal of the load current into an analog signal by the load pulling module to be used as the input current of the hard disk.
In some embodiments, the load-pulling module comprises an operational amplifier and a field effect transistor and is configured to adjust to pull the load current using a negative feedback manner; the circuit also comprises a comparator and a triode which limit the maximum working voltage of the field effect transistor, and a precision resistor which provides a pull-down resistor for the operational amplifier.
In conclusion, the embodiment of the invention solves the problem of complex test of the hard disk backboard, and the working condition of the backboard can be tested without building a complete machine; the situation that the load card is burnt due to misoperation in the test process is avoided, and the stability and the reliability of the load card are improved; the condition that the hard disks of the multiple back plates work simultaneously can be measured simultaneously, the limit condition of the hard disk back plates can be evaluated, and the working efficiency can be improved by quickly evaluating when the BOM is added at the front end in the later period; in addition, the testing means is simplified, the purchase cost of the equipment is reduced, the research and development cost is saved, and the testing efficiency is improved.
It can be seen from the foregoing embodiment that, in the hard disk backplane load measurement device provided in the embodiment of the present invention, the upper computer determines the load current according to the preset condition and sends the control signal configuring the load current to the signal expansion card through the communication interface thereof; the signal expansion card decodes the control signal by using the microchip shunt circuit and sends the control signal to the corresponding pulling load card through the universal serial bus; configuring, by the pull-loading card, an input current of a hard disk connected to the pull-loading card as a load current based on a control signal, and collecting an actual working current and a working voltage of the hard disk to feed back to the signal expansion card as a collected signal; the signal expansion card uses a microchip to combine codes to acquire signals and feed the signals back to an upper computer; the technical scheme that the upper computer extracts and processes actual working current and working voltage from the collected signals to generate the load measurement report can simultaneously pull and load and measure a plurality of hard disks on the single hard disk backboard, and measurement accuracy and efficiency are improved.
It should be particularly noted that, in the embodiment of the hard disk backplane load measurement apparatus, the embodiment of the hard disk backplane load measurement method is used to specifically describe the working process of each module, and a person skilled in the art can easily think that the modules are applied to other embodiments of the hard disk backplane load measurement method. Of course, since the steps in the embodiment of the hard disk backplane load measuring method may be mutually intersected, replaced, added, and deleted, the hard disk backplane load measuring apparatus with these reasonable permutation and combination changes shall also belong to the protection scope of the present invention, and shall not limit the protection scope of the present invention to the embodiment.
The foregoing are exemplary embodiments of the present disclosure, but it should be noted that various changes and modifications could be made herein without departing from the scope of the present disclosure as defined by the appended claims. The functions, steps and/or actions of the method claims in accordance with the disclosed embodiments described herein need not be performed in any particular order. Furthermore, although elements of the disclosed embodiments of the invention may be described or claimed in the singular, the plural is contemplated unless limitation to the singular is explicitly stated.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, of embodiments of the invention is limited to these examples; within the idea of an embodiment of the invention, also technical features in the above embodiment or in different embodiments may be combined and there are many other variations of the different aspects of an embodiment of the invention as described above, which are not provided in detail for the sake of brevity. Therefore, any omissions, modifications, substitutions, improvements, and the like that may be made without departing from the spirit and principles of the embodiments of the present invention are intended to be included within the scope of the embodiments of the present invention.
Claims (8)
1. A method for measuring the load of a hard disk backboard is characterized by comprising the following steps:
determining load current according to preset conditions by an upper computer and sending a control signal for configuring the load current to a signal expansion card through a communication interface of the upper computer;
decoding, by the signal expansion card, the control signal using a microchip shunt and sending to a corresponding pull load card through a universal serial bus;
configuring, by the pull-up card, an input current of a hard disk connected to the pull-up card as the load current based on the control signal using a micro control unit, and collecting an actual operating current and an operating voltage of the hard disk to be fed back to the signal expansion card as a collected signal;
the signal expansion card encodes the acquired signal by combining a microchip and feeds the encoded signal back to the upper computer;
the upper computer extracts and processes actual working current and working voltage from the collected signals to generate a load measurement report,
wherein configuring, by the pull-up card, an input current of a hard disk connected to the pull-up card to the load current based on the control signal using a micro control unit comprises:
converting the control signal into a digital signal of the load current by using the micro control unit to send the digital signal to a load pulling module;
and converting the digital signal of the load current into an analog signal by the load pulling module to be used as the input current of the hard disk.
2. The method of claim 1, wherein each of the loaders has a plurality of loaders disposed thereon, the plurality of loaders configured to work together to test a same hard disk or work separately to test a plurality of different hard disks.
3. The method of claim 1, wherein the pull-loading module comprises an operational amplifier and a field effect transistor and is configured to adjust to pull-load the load current using a negative feedback approach.
4. The method of claim 3, wherein the pull-up module further comprises a comparator and a transistor that limit a maximum operating voltage of the FET.
5. The method of claim 3, wherein the pull-up module further comprises a precision resistor that provides a pull-down resistance for the operational amplifier.
6. The method of claim 1, wherein collecting, by the load card, the actual operating current and operating voltage of the hard disk using a micro control unit to feed back to the signal expansion card as a collected signal comprises:
collecting the actual working current and working voltage of the hard disk by a voltage and current detection module through the pull load module;
and converting the actual working current and working voltage into digital signals serving as the acquisition signals by using the micro-control unit so as to be sent to the signal expansion card.
7. A hard disk backboard load measuring device is characterized by comprising:
a processor; and
a memory storing program code executable by the processor, the program code when executed performing the steps of:
determining load current according to preset conditions by an upper computer and sending a control signal for configuring the load current to a signal expansion card through a communication interface of the upper computer;
decoding, by the signal expansion card, the control signal using a microchip shunt and sending to a corresponding pull load card through a universal serial bus;
configuring, by the pull-up card, an input current of a hard disk connected to the pull-up card as the load current based on the control signal using a micro control unit, and collecting an actual operating current and an operating voltage of the hard disk to be fed back to the signal expansion card as a collected signal;
the signal expansion card encodes the acquired signal by combining a microchip and feeds the encoded signal back to the upper computer;
the upper computer extracts and processes actual working current and working voltage from the collected signals to generate a load measurement report,
configuring, by the pull-up card, an input current of a hard disk connected to the pull-up card to the load current based on the control signal using a micro control unit includes:
converting the control signal into a digital signal of the load current by using the micro control unit to be sent to a load pulling module;
and converting the digital signal of the load current into an analog signal by the load pulling module to be used as the input current of the hard disk.
8. The apparatus of claim 7, wherein the pull-loading module comprises an operational amplifier and a field effect transistor and is configured to adjust to pull-load the load current using a negative feedback manner; the circuit also comprises a comparator and a triode which limit the maximum working voltage of the field effect transistor, and a precision resistor which provides a pull-down resistor for the operational amplifier.
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| CN105068903A (en) * | 2015-08-13 | 2015-11-18 | 广州慧存电子科技有限公司 | Hard disk detection and repair system and apparatus |
| CN108152734A (en) * | 2018-03-20 | 2018-06-12 | 郑州市轨道交通有限公司运营分公司 | A kind of test system and test method for the maintenance of valve class |
| CN209895333U (en) * | 2019-06-28 | 2020-01-03 | 苏州浪潮智能科技有限公司 | Power supply testing device for hard disk backboard of server |
| CN111913414A (en) * | 2020-05-26 | 2020-11-10 | 温州长江汽车电子有限公司 | Virtual electronic load based on MCU |
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2020
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105068903A (en) * | 2015-08-13 | 2015-11-18 | 广州慧存电子科技有限公司 | Hard disk detection and repair system and apparatus |
| CN108152734A (en) * | 2018-03-20 | 2018-06-12 | 郑州市轨道交通有限公司运营分公司 | A kind of test system and test method for the maintenance of valve class |
| CN209895333U (en) * | 2019-06-28 | 2020-01-03 | 苏州浪潮智能科技有限公司 | Power supply testing device for hard disk backboard of server |
| CN111913414A (en) * | 2020-05-26 | 2020-11-10 | 温州长江汽车电子有限公司 | Virtual electronic load based on MCU |
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