CN109142929B - Power management device and implementation method thereof - Google Patents
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- CN109142929B CN109142929B CN201810999864.7A CN201810999864A CN109142929B CN 109142929 B CN109142929 B CN 109142929B CN 201810999864 A CN201810999864 A CN 201810999864A CN 109142929 B CN109142929 B CN 109142929B
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- 238000005259 measurement Methods 0.000 claims abstract description 10
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The disclosure provides a power management device and an implementation method thereof, and relates to the technical field of electronic devices. The power supply management device comprises a CPU, a voltage converter, a current measuring instrument, a resistance tester, an electric quantity measuring instrument, an input assembly, a switch switching assembly and a display. The CPU is used for receiving function selection performed by a user through the input assembly, controlling the voltage converter to perform voltage conversion according to the function selection, and controlling the switch switching assembly to be communicated with a connecting line between the voltage converter and the current measuring instrument, the resistance testing instrument or the electric quantity measuring instrument so as to realize a current measuring function, a resistance testing function or an electric quantity measuring function; wherein the function selection comprises selecting a current measurement function, a resistance test function or an electric quantity measurement function; the CPU is also used for receiving the detection result of the current measuring instrument, the resistance testing instrument or the electric quantity measuring instrument and sending the detection result to the display for displaying. The power management device and the implementation method thereof realize comprehensive functions.
Description
Technical Field
The present disclosure relates to the field of electronic device technologies, and in particular, to a power management device and an implementation method thereof.
Background
Nowadays, in many scenarios, different parameter measurements need to be performed on an electronic device to meet corresponding requirements, and therefore, a measurement apparatus with a relatively comprehensive function is developed as a user's requirement.
Disclosure of Invention
In view of the above, the present disclosure is directed to a power management device and a method for implementing the same.
In a first aspect, the present disclosure provides a power management device, including: the device comprises a CPU, a voltage converter, a current measuring instrument, a resistance tester, an electric quantity measuring instrument, an input assembly, a switch switching assembly and a display;
the voltage converter, the current measuring instrument, the resistance tester, the electric quantity measuring instrument, the input assembly, the switch switching assembly and the display are respectively electrically connected with the CPU, the voltage converter and the CPU are electrically connected with the power supply, and the switch switching assembly is connected among the voltage converter, the current measuring instrument, the resistance tester and the electric quantity measuring instrument;
the CPU is used for receiving function selection performed by a user through the input assembly, controlling the voltage converter to perform voltage conversion according to the function selection, controlling the switch switching assembly to be communicated with a connecting line between the voltage converter and the current measuring instrument, the resistance testing instrument or the electric quantity measuring instrument, and supplying power to the current measuring instrument, the resistance testing instrument or the electric quantity measuring instrument so as to realize a current measuring function, a resistance testing function or an electric quantity measuring function; wherein the function selection comprises selecting a current measurement function, a resistance test function or an electric quantity measurement function;
the CPU is also used for receiving the detection result of the current measuring instrument, the resistance tester or the electric quantity measuring instrument and sending the detection result to the display for displaying.
Optionally, the power supply is a socket connected with commercial power, and the voltage converter and the CPU are detachably connected to the socket through input power lines;
the input power line comprises a first cable used for being connected with a live wire end of the socket, a second cable used for being connected with a zero wire end of the socket and a third cable used for being connected with a ground wire end of the socket.
Optionally, the first cable, the second cable and the third cable are respectively connected with a plug, the first cable is connected with the live wire end of the socket through the plug, the second cable is connected with the live wire end of the socket through the plug, and the third cable is connected with the ground wire end of the socket through the plug.
Optionally, the CPU is further connected to a plurality of indicator lights, a correspondence relationship between each indicator light and the current measuring instrument, the resistance tester, and the electric quantity measuring instrument is stored in the CPU, and the CPU is configured to control the corresponding indicator light to be turned on after power is supplied to the current measuring instrument, the resistance tester, or the electric quantity measuring instrument.
Optionally, the voltage converter is further connected to an output power line, and the output power line is used for being connected to a socket for supplying power to external equipment;
the output power line comprises a fourth cable used for being connected with a live wire end of the socket, a fifth cable used for being connected with a null wire end of the socket, and a sixth cable used for being connected with a ground wire end of the socket.
Optionally, the output power line is detachably connected to the voltage converter;
the power management device comprises a plurality of groups of output power lines, and the length of each group of output power lines is different.
Optionally, the voltage converter is further connected with a USB interface.
Optionally, the power management device includes a hollow housing, the CPU, the voltage converter, the current measuring instrument, the resistance tester, the electric quantity measuring instrument, and the switch switching component are disposed in the housing, and the input component and the display are disposed in the housing in an embedded manner.
Optionally, the housing comprises a bottom, a top, a first side, a second side, a third side, and a fourth side, wherein the first side, the second side, the third side, and the fourth side are disposed between the bottom and the top to form a hollow rectangular parallelepiped structure, the first side and the second side are opposite, and the third side and the fourth side are opposite;
the CPU is arranged at the bottom, the voltage converter and the switch switching component are arranged at the first side, the current measuring instrument, the resistance testing instrument and the electric quantity measuring instrument are arranged at the second side, the display and the input component are arranged at the top in an embedded mode, and a heat dissipation channel is formed among the bottom, the top, the first side and the second side;
the third side and the fourth side are provided with heat dissipation holes.
In a second aspect, the present disclosure provides an implementation method of the foregoing power management apparatus, where the method includes:
the CPU receives a current measuring function, a resistance measuring function or an electric quantity measuring function selected by a user through an input assembly, controls the voltage converter to carry out voltage conversion, and controls the switch switching assembly to be communicated with a connecting line between the voltage converter and the current measuring instrument, the resistance measuring instrument or the electric quantity measuring instrument;
the voltage converter performs voltage conversion according to the control of the CPU, and the switch switching component is communicated with a connecting line between the voltage converter and the current measuring instrument, the resistance tester or the electric quantity measuring instrument according to the control of the CPU;
the current measuring instrument, the resistance tester or the electric quantity measuring instrument which is powered on carries out detection, and a detection result is sent to the CPU;
and the CPU receives the detection result and sends the detection result to the display for displaying.
According to the power management device and the implementation method thereof, the power management device is ingeniously designed, so that the CPU can be communicated with a connecting line between the voltage converter and the current measuring instrument, the resistance tester or the electric quantity measuring instrument through the switch switching assembly to supply power to the current measuring instrument, the resistance tester or the electric quantity measuring instrument, the current measuring function, the resistance testing function or the electric quantity measuring function is achieved, the functions are complete, and the implementation is convenient.
In order to make the aforementioned objects, features and advantages of the present disclosure more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
To more clearly illustrate the technical solutions of the present disclosure, the drawings needed for the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present disclosure, and therefore should not be considered as limiting the scope, and those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
Fig. 1 is a block diagram of a power management device according to the present disclosure.
Fig. 2 is another block diagram of a power management device according to the present disclosure.
Fig. 3 is a schematic structural diagram of a power management device according to the present disclosure.
Fig. 4 is a flowchart of an implementation method of a power management device according to the present disclosure.
Icon: 10-a housing; 11-a CPU; 12-a voltage converter; 13-a current meter; 14-resistance tester; 15-an electricity meter; 16-an input component; 17-a switch switching assembly; 18-a display; 19-an indicator light; 20-heat dissipation holes; 22-USB interface.
Detailed Description
The technical solutions in the present disclosure will be described clearly and completely with reference to the accompanying drawings in the present disclosure, and it is to be understood that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. The components of the present disclosure, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present disclosure, presented in the figures, is not intended to limit the scope of the claimed disclosure, but is merely representative of selected embodiments of the disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the disclosure without making creative efforts, shall fall within the protection scope of the disclosure.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
As shown in fig. 1, an embodiment of the present disclosure provides a power management device, including: a Central Processing Unit (CPU 11), a voltage converter 12, a current measuring instrument 13, a resistance tester 14, an electricity measuring instrument 15, an input module 16, a switch switching module 17 and a display 18.
The voltage converter 12, the current measuring instrument 13, the resistance tester 14, the electricity measuring instrument 15, the input component 16, the switch switching component 17 and the display 18 are respectively electrically connected with the CPU11, the voltage converter 12 and the CPU11 are electrically connected with a power supply, and the switch switching component 17 is connected between the voltage converter 12 and the current measuring instrument 13, the resistance tester 14 and the electricity measuring instrument 15.
The CPU11 stores therein working voltages respectively corresponding to the current measuring instrument 13, the resistance testing instrument 14, and the electric quantity measuring instrument 15, and the CPU11 is configured to receive a function selection performed by a user through the input component 16, control the voltage converter 12 to perform voltage conversion according to the function selection, and control the switch switching component 17 to connect a connection line between the voltage converter 12 and the current measuring instrument 13, the resistance testing instrument 14, or the electric quantity measuring instrument 15, so as to supply power to the current measuring instrument 13, the resistance testing instrument 14, or the electric quantity measuring instrument 15, thereby implementing a current measuring function, a resistance testing function, or an electric quantity measuring function. Wherein the function selection comprises selecting a current measurement function, a resistance test function, or an electrical quantity measurement function.
The CPU11 is further configured to receive a detection result of the current measuring instrument 13, the resistance measuring instrument 14, or the electric quantity measuring instrument 15, and send the detection result to the display 18 for displaying.
The input component 16 may be a plurality of keys, for example, one key corresponds to each of the current measuring instrument 13, the resistance measuring instrument 14 and the electric quantity measuring instrument 15, and the user operates the corresponding key to complete the function selection. For example, if the CPU11 receives a trigger signal that a key corresponding to the current measuring instrument 13 is operated, it determines that the current measuring function is selected, and controls the switch switching component 17 to connect the connection line between the voltage converter 12 and the current measuring instrument 13 to supply power to the current measuring instrument 13, so as to implement the current measuring function.
The working voltages corresponding to the current measuring instrument 13, the resistance measuring instrument 14 and the electric quantity measuring instrument 15 may be the same or different, and the disclosure does not limit this, and the CPU11 only needs to control the voltage converter 12 to convert the voltage of the power supply into the working voltages corresponding to the current measuring instrument 13, the resistance measuring instrument 14 and the electric quantity measuring instrument 15.
The current measuring instrument 13, the resistance measuring instrument 14, and the electric quantity measuring instrument 15 can be flexibly selected as long as they are devices capable of realizing the current measuring function, the resistance measuring function, and the electric quantity measuring function accordingly. For example, the current measuring instrument 13 may be a device including a current sensor. For another example, the current measuring instrument 13 may be model PZ80L-AT3, WS-100, or the like. The resistance tester 14 may be model No. LM61-CHB2000, VSN/AT-511, etc. The type of the electricity measuring instrument 15 can be KM20-CTF-400A, BT-168D and the like.
The switch switching component 17 can be flexibly selected as long as the connection between the voltage converter 12 and the current measuring instrument 13, the resistance tester 14 or the electric quantity measuring instrument 15 can be communicated. For example, the switch switching component 17 may be a relay component, the current measuring instrument 13, the resistance measuring instrument 14, and the electric quantity measuring instrument 15 correspond to one relay component respectively, and the CPU11 controls the normally open contact to be closed by controlling the coil of the relay component to be energized, so as to communicate with the connection line between the voltage converter 12 and the current measuring instrument 13, the resistance measuring instrument 14, or the electric quantity measuring instrument 15.
In the present disclosure, there are a number of options for the power source, for example, the power source may be a built-in battery that powers the voltage converter 12 and the CPU 11. For another example, the power source may be a socket connected to the mains, and the voltage converter 12 and the CPU11 are detachably connected to the socket through input power lines.
The input power line comprises a first cable used for being connected with a live wire end of the socket, a second cable used for being connected with a zero wire end of the socket and a third cable used for being connected with a ground wire end of the socket.
In order to realize convenient connection with the socket, the first cable, the second cable and the third cable can be connected with the plug respectively, the first cable passes through the plug connection the live wire end of socket, the second cable passes through the plug connection the zero line end of socket, the third cable passes through the plug connection the ground wire end of socket. The arrangement of first cable, second cable and third cable for power management device and three holes and two hole sockets homoenergetic are connected, improve the suitability.
Referring to fig. 2, the CPU11 may further be connected to a plurality of indicator lights 19, the CPU11 stores a corresponding relationship between each indicator light 19 and the current measuring instrument 13, the resistance testing instrument 14, and the electricity measuring instrument 15, and the CPU11 is configured to control the corresponding indicator light 19 to be turned on after power is supplied to the current measuring instrument 13, the resistance testing instrument 14, or the electricity measuring instrument 15. For example, the current measuring instrument 13, the resistance measuring instrument 14, and the electricity measuring instrument 15 may correspond to different colored indicator lamps 19, respectively, and the CPU11 controls the different colored indicator lamps 19 to light up, thereby indicating the operating states of the current measuring instrument 13, the resistance measuring instrument 14, and the electricity measuring instrument 15.
In order to improve the comprehensiveness of the power management device, the voltage converter 12 may further be connected with an output power line, and the output power line is used for connecting with a socket for supplying power to an external device. The output power line comprises a fourth cable used for being connected with a live wire end of the socket, a fifth cable used for being connected with a zero wire end of the socket and a sixth cable used for being connected with a ground wire end of the socket. The arrangement of fourth cable, fifth cable and sixth cable for power management device and three holes and two hole sockets homoenergetic are connected, improve the suitability.
The arrangement of the output power line enables the power management device to provide the voltage converted by the voltage converter 12 to the external equipment, thereby meeting the power consumption requirements of different external equipment.
Further, the output power line is detachably connected to the voltage converter 12. The power management device comprises a plurality of groups of output power lines, and the length of each group of output power lines is different. Through setting up the different output power cord of multiunit length for power management device can satisfy the power consumption demand apart from its external device of different distances, improves the suitability.
In order to further improve the comprehensiveness of the function of the power management apparatus, a Universal Serial Bus (USB) interface may be connected to the voltage converter 12, so as to supply power to an external device through the USB interface 22.
Referring to fig. 3, in the present disclosure, the power management device includes a hollow housing 10, the CPU11, the voltage converter 12, the current measuring instrument 13, the resistance measuring instrument 14, the electricity measuring instrument 15, and the switch switching component 17 are embedded in the housing 10, and the input component 16 and the display 18 are embedded in the housing 10. The casing 10 reliably protects the CPU11, the voltage converter 12, the current measuring instrument 13, the resistance measuring instrument 14, the electric quantity measuring instrument 15 and the switch switching component 17, and the service life of the power management device is prolonged.
Optionally, the housing 10 includes a bottom, a top, a first side, a second side, a third side, and a fourth side, wherein the first side, the second side, the third side, and the fourth side are disposed between the bottom and the top to form a hollow rectangular parallelepiped structure, the first side and the second side are opposite, and the third side and the fourth side are opposite. The CPU11 is installed on the bottom, the voltage converter 12 and the switch switching component 17 are installed on the first side, the current measuring instrument 13, the resistance tester 14 and the electric quantity measuring instrument 15 are installed on the second side, the display 18 and the input component 16 are installed on the top in an embedded manner, and a heat dissipation channel is formed among the bottom, the top, the first side and the second side. The third side and the fourth side are provided with heat dissipation holes 20.
The case 10 is designed to be a rectangular parallelepiped structure, each device is mounted on the bottom, the top, the first side and the second side of the case 10, no device is mounted on the third side and the fourth side, and the heat dissipation holes 20 are provided, so that heat dissipated by each device of the power management apparatus can be discharged through the heat dissipation holes 20 via the heat dissipation channels formed between the bottom, the top, the first side and the second side (see the arrow direction in fig. 3). This kind of structural design can effectively improve the radiating effect, avoids power management device thermal runaway to improve power management device safety in utilization and reliability, and then improve its life.
On the basis, as shown in fig. 4, the present disclosure further provides an implementation method of the foregoing power management apparatus, where the method includes the following steps.
And step S21, the CPU receives the current measuring function, the resistance measuring function or the electric quantity measuring function selected by the user through the input component, controls the voltage converter to carry out voltage conversion, and controls the switch switching component to be communicated with a connecting line between the voltage converter and the current measuring instrument, the resistance measuring instrument or the electric quantity measuring instrument.
And step S22, the voltage converter performs voltage conversion according to the control of the CPU, and the switch switching component is communicated with a connecting line between the voltage converter and the current measuring instrument, the resistance tester or the electric quantity measuring instrument according to the control of the CPU.
And step S23, detecting the current measuring instrument, the resistance testing instrument or the electric quantity measuring instrument which is powered on, and sending the detection result to the CPU.
And step S24, the CPU receives the detection result and sends the detection result to the display for displaying.
The power management device and the implementation method thereof provided by the disclosure skillfully design the power management device, so that a CPU can be communicated with a connecting line between a voltage converter and a current measuring instrument, a resistance tester or an electric quantity measuring instrument through a switch switching component to supply power to the current measuring instrument, the resistance tester or the electric quantity measuring instrument, thereby realizing a current measuring function, a resistance testing function or an electric quantity measuring function, and supplying power to external equipment through a USB interface and an output power line, and the power management device and the implementation method thereof have the advantages of complete functions and convenience in implementation. The safety positions of the devices are ingeniously designed, so that the power management device has a good heat dissipation effect, thermal runaway of the power management device is avoided, the use safety and reliability of the power management device are improved, and the service life of the power management device is prolonged.
In the several embodiments provided in the present disclosure, it should be understood that the disclosed apparatus and method may be implemented in other manners. The apparatus and method embodiments described above are illustrative only, as the flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, functional modules in the embodiments of the present disclosure may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing is illustrative of only alternative embodiments of the present disclosure and is not intended to limit the disclosure, which may be modified and varied by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (10)
1. A power management device, comprising: the device comprises a CPU, a voltage converter, a current measuring instrument, a resistance tester, an electric quantity measuring instrument, an input assembly, a switch switching assembly and a display;
the voltage converter, the current measuring instrument, the resistance tester, the electric quantity measuring instrument, the input assembly, the switch switching assembly and the display are respectively electrically connected with the CPU, the voltage converter and the CPU are electrically connected with the power supply, and the switch switching assembly is connected among the voltage converter, the current measuring instrument, the resistance tester and the electric quantity measuring instrument;
the CPU is used for receiving function selection performed by a user through the input assembly, controlling the voltage converter to perform voltage conversion according to the function selection, controlling the switch switching assembly to be communicated with a connecting line between the voltage converter and the current measuring instrument, the resistance testing instrument or the electric quantity measuring instrument, and supplying power to the current measuring instrument, the resistance testing instrument or the electric quantity measuring instrument so as to realize a current measuring function, a resistance testing function or an electric quantity measuring function; wherein the function selection comprises selecting a current measurement function, a resistance test function or an electric quantity measurement function;
the CPU is also used for receiving the detection result of the current measuring instrument, the resistance tester or the electric quantity measuring instrument and sending the detection result to the display for displaying.
2. The power management device of claim 1, wherein the power source is a socket connected to a mains supply, and the voltage converter and the CPU are detachably connected to the socket via an input power line;
the input power line comprises a first cable used for being connected with a live wire end of the socket, a second cable used for being connected with a zero wire end of the socket and a third cable used for being connected with a ground wire end of the socket.
3. The power management device of claim 2, wherein the first cable, the second cable and the third cable are respectively connected with a plug, the first cable is connected with a live wire end of the socket through a plug, the second cable is connected with a neutral wire end of the socket through a plug, and the third cable is connected with a ground wire end of the socket through a plug.
4. The power management device according to claim 1, wherein the CPU is further connected to a plurality of indicator lamps, the CPU stores therein correspondence between each indicator lamp and each of the current measuring instrument, the resistance measuring instrument, and the power measuring instrument, and the CPU is configured to control the corresponding indicator lamp to be turned on after power is supplied to the current measuring instrument, the resistance measuring instrument, or the power measuring instrument.
5. The power management device of claim 1, wherein the voltage converter is further connected to an output power line, and the output power line is used for connecting with a socket for supplying power to an external device;
the output power line comprises a fourth cable used for being connected with a live wire end of the socket, a fifth cable used for being connected with a null wire end of the socket, and a sixth cable used for being connected with a ground wire end of the socket.
6. The power management device of claim 5, wherein the output power line is detachably connected to the voltage converter;
the power management device comprises a plurality of groups of output power lines, and the length of each group of output power lines is different.
7. The power management device of claim 1, wherein a USB interface is further connected to the voltage converter.
8. The power management device according to any one of claims 1 to 7, wherein the power management device comprises a hollow housing, the CPU, the voltage converter, the current measuring instrument, the resistance tester, the electricity measuring instrument and the switch switching component are embedded in the housing, and the input component and the display are embedded in the housing.
9. The power management device of claim 8, wherein the housing comprises a bottom, a top, a first side, a second side, a third side, and a fourth side, wherein the first side, the second side, the third side, and the fourth side are disposed between the bottom and the top to form a hollow rectangular parallelepiped structure, the first side and the second side are opposite, and the third side and the fourth side are opposite;
the CPU is arranged at the bottom, the voltage converter and the switch switching component are arranged at the first side, the current measuring instrument, the resistance testing instrument and the electric quantity measuring instrument are arranged at the second side, the display and the input component are arranged at the top in an embedded mode, and a heat dissipation channel is formed among the bottom, the top, the first side and the second side;
the third side and the fourth side are provided with heat dissipation holes.
10. A method for implementing the power management device of any one of claims 1 to 9, the method comprising:
the CPU receives a current measuring function, a resistance measuring function or an electric quantity measuring function selected by a user through an input assembly, controls the voltage converter to carry out voltage conversion, and controls the switch switching assembly to be communicated with a connecting line between the voltage converter and the current measuring instrument, the resistance measuring instrument or the electric quantity measuring instrument;
the voltage converter performs voltage conversion according to the control of the CPU, and the switch switching component is communicated with a connecting line between the voltage converter and the current measuring instrument, the resistance tester or the electric quantity measuring instrument according to the control of the CPU;
the current measuring instrument, the resistance tester or the electric quantity measuring instrument which is powered on carries out detection, and a detection result is sent to the CPU;
and the CPU receives the detection result and sends the detection result to the display for displaying.
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| CN101957433B (en) * | 2009-07-15 | 2013-08-14 | 广达电脑股份有限公司 | Circuit and method for measuring battery electric quantity |
| CN102075015B (en) * | 2011-01-19 | 2012-08-15 | 中国海洋石油总公司 | Towline high voltage direct current (DC) power supply for geophysical exploration |
| CN202651882U (en) * | 2012-06-18 | 2013-01-02 | 浙江大学 | Power supply system of UAV remote sensing platform |
| CN106443460A (en) * | 2016-09-06 | 2017-02-22 | 北京小米移动软件有限公司 | Power supply management device |
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