CN204595584U - Current monitoring module - Google Patents
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- CN204595584U CN204595584U CN201520249280.XU CN201520249280U CN204595584U CN 204595584 U CN204595584 U CN 204595584U CN 201520249280 U CN201520249280 U CN 201520249280U CN 204595584 U CN204595584 U CN 204595584U
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 27
- 230000005389 magnetism Effects 0.000 claims abstract description 29
- 230000005611 electricity Effects 0.000 claims abstract description 14
- 238000012545 processing Methods 0.000 claims description 43
- 239000007769 metal material Substances 0.000 claims description 10
- 230000004907 flux Effects 0.000 claims 2
- 230000035945 sensitivity Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract 3
- 238000005259 measurement Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 9
- 239000004020 conductor Substances 0.000 description 4
- 238000005457 optimization Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 2
- 238000005253 cladding Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 239000013598 vector Substances 0.000 description 2
- 206010063385 Intellectualisation Diseases 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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Abstract
The utility model discloses current monitoring module, comprise current protection unit and Electro-metering unit, current protection unit comprises the first magnetism gathering rings, the first magnetic sensor chips and leakage current process chip, and Electro-metering unit comprises the second magnetism gathering rings, the second magnetic sensor chips, overcurrent process chip and electricity process chip; A kind of current monitoring module that simultaneously can realize overcurrent protection, earth leakage protection and electric quantity metering that the utility model proposes, and this module has higher precision and sensitivity and very little volume, accessible site is in the compact electric apparatus such as smart jack.
Description
Technical Field
The utility model relates to a current sensor field, especially current monitoring module.
Background
In the fields of home, industry, medical treatment and the like, the safety of power utilization is particularly important, so that the current and the electric quantity of system power supply and the leakage condition are monitored in real time, and if the leakage or the overload condition exists, accurate judgment and timely response must be made.
The current mainstream leakage current measurement adopts a mutual inductor which consists of a closed magnetic core and a coil, and the working mode of the leakage circuit breaker protector adopting the mutual inductor to detect the leakage current is as follows: two wires of the same loop penetrate through the magnetic core, and because the current on each wire is equal in magnitude and opposite in direction, the sum of the total current vectors is zero, when electric leakage occurs, the loop is branched, the sum of the current vectors penetrating through the magnetic core of the mutual inductor is not equal to zero any more, and the inductive potential is generated on the secondary side of the mutual inductor, so that an actuating mechanism is pushed to jump off the main loop, and the protection effect is achieved. The mutual inductor adopting the closed magnetic core has a defect in measuring leakage current, namely, the magnetic conductivity can be rapidly reduced and saturated under the action of a direct current component, and a sampling value is rapidly reduced, so that the phenomena of misjudgment and misjudgment appear, and great hidden danger is brought to the electricity utilization safety in the fields of home furnishing, industry, medical treatment and the like.
At present, a current sensor which takes a hall material as a sensitive element is adopted for mainstream current measurement, the hall current sensor usually comprises an open-loop magnetic gathering ring structure, a live wire penetrates through the center of the magnetic gathering ring, and the hall element measures the current of the wire by measuring the magnetic field intensity gathered to an opening of the magnetic gathering ring. However, the precision and sensitivity of the hall current sensor are very low, the size is large, the temperature characteristic is very poor, and the requirement of the modern household, industry, medical treatment and other fields on the high precision of current measurement cannot be met.
With the popularization of modern smart homes, higher requirements are placed on the size, multiple functions and intellectualization of household appliances, such as smart sockets (see patent of China publication No. CN 103187666A: smart sockets with a metering function) released by Hell corporation, and an electric quantity metering module can be integrated in the sockets. However, in the prior art, it has not been possible to integrate leakage detection, current measurement and power measurement in one module. From the above, the current monitoring device can not meet the requirements of modern home, industry and medical fields.
Disclosure of Invention
The utility model aims to solve the technical problem that overcome prior art not enough and provide current monitoring module, can realize overcurrent protection, earth leakage protection and electric quantity measurement simultaneously, and this module has higher precision and sensitivity and very little volume, can integrate in small-size electrical apparatus such as smart jack.
The utility model discloses a solve above-mentioned technical problem and adopt following technical scheme:
according to the utility model provides a current monitoring module, including current protection unit and power consumption measurement unit, the current protection unit includes first magnetism gathering ring, first magnetic sensor chip and leakage current processing chip, and the power consumption measurement unit includes second magnetism gathering ring, second magnetic sensor chip, overcurrent processing chip and electric quantity processing chip; wherein,
the first magnetism gathering ring is of an annular structure which is made of metal materials and provided with an air gap, and two current leads with opposite current flow directions penetrate through the inside of the first magnetism gathering ring;
the first magnetic sensor chip is positioned in the air gap of the first magnetic gathering ring and used for measuring the field intensity of the magnetic field gathered at the air gap of the first magnetic gathering ring and outputting a first electric signal to the leakage current processing chip;
the leakage current processing chip is used for processing the first electric signal and then outputting a leakage current signal;
the second focusing ring is an annular structure which is made of metal materials and provided with an air gap, and a current lead penetrates through the second focusing ring;
the second magnetic sensor chip is positioned in the air gap of the second focusing ring and used for measuring the field intensity of the magnetic field converged at the air gap of the second focusing ring and outputting a second electric signal to the overcurrent processing chip and the electric quantity processing chip;
the overcurrent processing chip is used for processing the second electric signal and then outputting a current signal;
and the electric quantity processing chip is used for outputting an electric quantity signal after the second electric signal is processed.
As a further optimization scheme of current monitoring module, all twine the degaussing coil on first gathering magnetic ring, the second gathering magnetic ring.
As the further optimization scheme of current monitoring module, still include cladding current protection unit and the shielded enclosure who uses the electric metering unit.
As a further optimization scheme of current monitoring module, shielding shell is metal material.
As a further optimization scheme of current monitoring module, first magnetic sensor chip, second magnetic sensor chip all are single resistance, half-bridge or full-bridge structure that comprises magnetic sensing element, magnetic sensing element is hall element, anisotropic magnetic resistance component, huge magnetic resistance component and/or magnetic tunnel junction component.
The utility model adopts the above technical scheme to compare with prior art, have following technological effect: the utility model provides a can realize overcurrent protection, earth leakage protection and electric quantity measurement's current monitoring module simultaneously, and this module has higher precision and sensitivity and very little volume, can integrate in small-size electrical apparatus such as smart jack.
Drawings
Fig. 1 is a schematic diagram of the operation of the current monitoring module according to the present invention.
Fig. 2 is a schematic structural diagram of the current monitoring module according to the present invention.
Fig. 3 is a schematic structural diagram of the current protection unit.
Fig. 4 is a schematic diagram of the structure of the electricity consumption metering unit.
Fig. 5 is a graph showing an output curve of the magnetic sensor chip.
The reference numerals in the figures are to be interpreted: 13-the current-in conductor, 14-the current-out conductor, 31-the value of the current I flowing through 13132-value of the current I flowing through 14251-current protection unit, 52-electricity consumption metering unit, 53-microprocessor, 54-relay, 17-shielding shell, 12 a-first magnetism-gathering ring in current protection unit, 12 b-second magnetism-gathering ring in electricity consumption metering unit, 1-first sensitive axis, 2-second sensitive axis, 11 a-first magnetic sensor chip, 11 b-second magnetic sensor chip, 15-leakage current processing chip, 18-electricity processing chip, 19-overcurrent processing chip, 21 a-first magnetic field, 21 b-second magnetic field.
Detailed Description
The technical scheme of the utility model is further explained in detail with the attached drawings as follows:
in order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The current monitoring module comprises a current protection unit 51 and an electricity consumption metering unit 52, wherein the current protection unit comprises a first magnetism gathering ring 12a, a first magnetic sensor chip 11a and a leakage current processing chip 15, and the electricity consumption metering unit comprises a second magnetism gathering ring 12b, a second magnetic sensor chip 11b, an overcurrent processing chip 19 and an electricity consumption processing chip 18; wherein,
the first magnetism gathering ring is of an annular structure which is made of metal materials and provided with an air gap, and two current leads with opposite current flow directions penetrate through the inside of the first magnetism gathering ring;
the first magnetic sensor chip is positioned in the air gap of the first magnetic gathering ring and used for measuring the field intensity of the magnetic field gathered at the air gap of the first magnetic gathering ring and outputting a first electric signal to the leakage current processing chip;
the leakage current processing chip is used for processing the first electric signal and then outputting a leakage current signal;
the second focusing ring is an annular structure which is made of metal materials and provided with an air gap, and a current lead penetrates through the second focusing ring;
the second magnetic sensor chip is positioned in the air gap of the second focusing ring and used for measuring the field intensity of the magnetic field converged at the air gap of the second focusing ring and outputting a second electric signal to the overcurrent processing chip and the electric quantity processing chip;
the overcurrent processing chip is used for processing the second electric signal and then outputting a current signal;
and the electric quantity processing chip is used for outputting an electric quantity signal after the second electric signal is processed.
The first magnetism gathering ring and the second magnetism gathering ring are respectively wound with a demagnetizing coil. The utility model discloses still include cladding current protection unit and the shielded enclosure 17 of power consumption measurement unit. The shielding shell is made of metal materials.
Fig. 1 is a schematic diagram of the current monitoring module provided by the present invention, and fig. 2 is a schematic diagram of the current monitoring module provided by the present invention. As shown in fig. 1 and 2, the utility model provides a current monitoring module includes current protection unit 51 and power consumption metering unit 52, current protection unit 51 is used for measuring the leakage current, and with the microprocessor 53 of leakage current output signal transmission to rear end, power consumption metering unit 52 is used for measuring electric current and electric quantity size, and with output signal transmission to the microprocessor 53 of rear end, microprocessor 53 judges whether the output signal of current protection unit 51 and power consumption metering unit 52 is safe, if there is the leakage current, or the electric current is too big, or the return circuit load is too big, microprocessor 53 cuts off the power consumption return circuit through control relay 54, guarantee power consumption safety.
Fig. 2 is a schematic structural diagram of the current monitoring module according to the present invention. The current leads 13 and 14 to be detected penetrate through a first magnetism gathering ring 12a in the current protection unit, the current lead 13 to be detected penetrates through a second magnetism gathering ring 12b in the electricity consumption metering unit, the first magnetism gathering ring and the second magnetism gathering ring are both metal ring structures with air gaps, a first magnetic sensor chip 11a and a second magnetic sensor chip 11b (shown in figures 3 and 4) are arranged at the air gaps, and sensitive shafts 1 and 2 of the first magnetic gathering ring and the second magnetism gathering ring are perpendicular to the cross sections of the first magnetism gathering ring 12a and the second magnetism gathering ring 12b and are parallel to a tangent line at the centers of the air gaps of the first magnetism gathering ring 12a and the second magnetism gathering ring 12 b. The sensitive axle is parallel with the tangent line that gathers magnetic ring air gap department is the utility model provides a current monitoring module's a design, but is not limited to this, and sensitive axle also can be perpendicular or be certain angle with the tangent line that gathers magnetic ring air gap department, gathers magnetic ring air gap department magnetic field through the measurement and measures along the component of sensitive axle direction, and the direction of sensitive axle 1 and sensitive axle 2 can be the same, also can be inequality.
The electricity consumption metering unit: the current inlet wire 13 is electrified with current I1(31) Thus produced around the wireAn induced magnetic field is generated, the second poly magnetic ring 12b collects the induced magnetic field at the air gap, the second magnetic sensing chip 11b induces the second magnetic field 21b, and then output is generated, and output signals of the second magnetic sensing chip are processed by the overcurrent processing chip 19 and the electric quantity processing chip 18 (not shown in fig. 2) and then are respectively output to the microprocessor 53.
A current protection unit: the current inlet wire 13 and the current outlet wire 14 are respectively a current inlet wire and a current outlet wire, and if no electric leakage occurs, the current value I of the current inlet wire 13 is equal to the current value I1(31) And the current value I of the electrically outgoing conductor 142(32) Equal and opposite directions, the resultant magnetic field generated near the current incoming wire 13 and the current outgoing wire 14 can be approximately zero, so the first magnetism collecting ring 12a does not generate an induced magnetic field, and the output of the first magnetic sensor chip 11a is zero. If there is leakage current, the current value I of the current-carrying wire 131And the current value I of the electrically outgoing conductor 142When the leakage current is not equal, the first magnetism gathering ring 12a gathers the magnetic field generated near the current conducting wires 13 and 14 to the air gap, the first magnetic sensing chip 11a senses the first magnetic field 21a, and then outputs the first magnetic field to the microprocessor 53, and the output signal of the first magnetic sensing chip is processed by the leakage current processing chip 15 (not shown in fig. 2) and then is output. Because the magnetic gathering ring structure with the air gap is adopted, the magnetic conductivity of the magnetic gathering ring cannot be rapidly attenuated under the action of the direct current component, and the saturation field of the magnetic gathering ring is much higher than that of a closed magnetic ring. In order to reduce hysteresis, the first magnetism focusing ring 12a and the second magnetism focusing ring 12b may be wound with a certain number of turns of coils.
In order to avoid interference of external current and magnetic field, the current monitoring module further comprises a shielding shell 17, wherein the shielding shell 17 is made of metal material, and the current protection unit 51 and the electricity metering unit 52 are covered in the shielding shell 17.
The over-current processing chip 19 and the leakage current processing chip 15 are of a common operational amplifier structure, and are directly connected with the first magnetic sensor chip 11a and the second magnetic sensor chip 11b to output current signals. The power processing chip 18 may be an existing mature power metering chip such as the power computing IC series available from HiTrendtech corporation. The input end of the electric quantity processing chip is respectively connected with the second magnetic core sensor chip 11b and the electric loop to output an electric quantity signal. The utility model provides a monitoring module is a sensor group who is used for providing output signal in fact, with electric leakage, overflow and electric quantity measurement integration in a sensor module, therefore microprocessor 53 and relay 54 do not include in this module. The microprocessor 53 may be a single chip microcomputer, and in actual use, related power consumption parameters may be set according to the purpose for customization, for example, in the patent of chinese publication No. CN 103187666A: ATT7037 chip from HiTrendtech corporation is used in smart outlets with metering capability.
The first magnetic sensor chip and the second magnetic sensor chip are of single-resistor, half-bridge or full-bridge structures formed by magnetic sensing elements, and the magnetic sensing elements are Hall elements, anisotropic magneto-resistance elements, giant magneto-resistance elements and/or magnetic tunnel junction elements. The magnetic sensing element can be a giant magnetoresistance element and/or a magnetic tunnel junction element with large saturation field and high precision. The giant magnetoresistance element and the magnetic tunnel junction element are magnetoresistance elements with resistance values changing along with the change of an external magnetic field, R-H (resistance value-external magnetic field) curves of the magnetoresistance elements in the prior art have the characteristics of low magnetic hysteresis, high saturation field and wide linear range, and compared with the traditional magnetic sensing elements such as an inductance coil and a Hall element, the giant magnetoresistance element and the magnetic tunnel junction element have higher precision and better temperature characteristics, and compared with an anisotropic magnetoresistance element, the giant magnetoresistance element and the magnetic tunnel junction element have higher saturation field and are optimal as sensing elements of leakage sensors.
The first magnetic sensor chip and the second magnetic sensor chip may be in a single resistor, half bridge or full bridge configuration. The bridge arm of the single resistor, the half bridge or the full bridge is formed by connecting one or more same magnetic sensing elements in series and/or in parallel, each bridge arm can be equivalent to a magneto resistor, and the magnetic field sensitive directions of the magnetic sensing elements in each bridge arm are the same. The single resistance structure comprises a magnetic resistor, the half-bridge structure is formed by connecting two magnetic resistors with the same physical property in series, the full-bridge structure is formed by connecting four magnetic resistors with the same physical property, and the single resistance structure is usedAnd introducing a stable voltage or current. The half-bridge or full-bridge structure is the optimal choice, and the output curve thereof is shown in fig. 5, and fig. 5 is a schematic output curve diagram of the magnetic sensor chip. Wherein, VMAX+And VMAX-Is the maximum output value, HSThe working area of the saturation field is the linear area of the output curve.
The structure diagram and the working principle of the giant magnetoresistance element and the magnetic tunnel element, and the specific working mode of the magnetic sensor chip can refer to chinese patent with publication number CN 103645369A: a current sensing device.
It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations to the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And such obvious changes and modifications which fall within the spirit of the invention are deemed to be covered by the present invention.
Claims (5)
1. The current monitoring module comprises a current protection unit and an electricity consumption metering unit, and is characterized in that the current protection unit comprises a first magnetism gathering ring, a first magnetic sensor chip and a leakage current processing chip, and the electricity consumption metering unit comprises a second magnetism gathering ring, a second magnetic sensor chip, an overcurrent processing chip and an electricity quantity processing chip; wherein,
the first magnetism gathering ring is of an annular structure which is made of metal materials and provided with an air gap, and two current leads with opposite current flow directions penetrate through the inside of the first magnetism gathering ring;
the first magnetic sensor chip is positioned in the air gap of the first magnetic gathering ring and used for measuring the field intensity of the magnetic field gathered at the air gap of the first magnetic gathering ring and outputting a first electric signal to the leakage current processing chip;
the leakage current processing chip is used for processing the first electric signal and then outputting a leakage current signal;
the second focusing ring is an annular structure which is made of metal materials and provided with an air gap, and a current lead penetrates through the second focusing ring;
the second magnetic sensor chip is positioned in the air gap of the second focusing ring and used for measuring the field intensity of the magnetic field converged at the air gap of the second focusing ring and outputting a second electric signal to the overcurrent processing chip and the electric quantity processing chip;
the overcurrent processing chip is used for processing the second electric signal and then outputting a current signal;
and the electric quantity processing chip is used for outputting an electric quantity signal after the second electric signal is processed.
2. The current monitoring module of claim 1, wherein the first magnetic flux concentrating ring and the second magnetic flux concentrating ring are wound with degaussing coils.
3. The current monitoring module of claim 1, further comprising a shielded enclosure encasing the current protection unit and the electricity usage metering unit.
4. The current monitoring module of claim 3, wherein the shielding shell is a metallic material.
5. The current monitoring module according to any one of claims 1-4, wherein the first magnetic sensor chip and the second magnetic sensor chip are each a single resistor, a half-bridge or a full-bridge structure formed by magnetic sensing elements, and the magnetic sensing elements are Hall elements, anisotropic magnetoresistive elements, giant magnetoresistive elements and/or magnetic tunnel junction elements.
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| CN201520249280.XU CN204595584U (en) | 2015-04-22 | 2015-04-22 | Current monitoring module |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104880987A (en) * | 2015-04-22 | 2015-09-02 | 无锡乐尔科技有限公司 | Current monitoring module |
| CN105932490A (en) * | 2016-06-07 | 2016-09-07 | 西安交通大学 | MEMS switch based USB electric leakage protection chip |
| JP2018007549A (en) * | 2016-07-01 | 2018-01-11 | ウェーバー‐スティーブン プロダクツ エルエルシー | Electric grill with current protection circuitry |
| CN108808621A (en) * | 2017-05-05 | 2018-11-13 | 韦伯-斯蒂芬产品有限公司 | Wireless control and status monitoring for the electric oven with current protecting circuit |
| US11454677B2 (en) | 2016-07-01 | 2022-09-27 | Weber-Stephen Products Llc | Wireless control and status monitoring for electric grill with current protection circuitry |
| US11703928B2 (en) | 2016-07-01 | 2023-07-18 | Weber-Stephen Products Llc | Digital power supply with wireless monitoring and control |
| US12137832B2 (en) | 2016-07-01 | 2024-11-12 | Weber-Stephen Products Llc | Digital power supply |
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2015
- 2015-04-22 CN CN201520249280.XU patent/CN204595584U/en active Active
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104880987A (en) * | 2015-04-22 | 2015-09-02 | 无锡乐尔科技有限公司 | Current monitoring module |
| CN105932490A (en) * | 2016-06-07 | 2016-09-07 | 西安交通大学 | MEMS switch based USB electric leakage protection chip |
| US10524312B2 (en) | 2016-07-01 | 2019-12-31 | Weber-Stephen Products Llc | Electric grill with current protection circuitry |
| EP3273558A3 (en) * | 2016-07-01 | 2018-04-25 | Weber-Stephen Products, LLC | Electric grill with current protection circuitry |
| JP2018007549A (en) * | 2016-07-01 | 2018-01-11 | ウェーバー‐スティーブン プロダクツ エルエルシー | Electric grill with current protection circuitry |
| US11454677B2 (en) | 2016-07-01 | 2022-09-27 | Weber-Stephen Products Llc | Wireless control and status monitoring for electric grill with current protection circuitry |
| US11622420B2 (en) | 2016-07-01 | 2023-04-04 | Weber-Stephen Products Llc | Electric grill with current protection circuitry |
| US11703928B2 (en) | 2016-07-01 | 2023-07-18 | Weber-Stephen Products Llc | Digital power supply with wireless monitoring and control |
| US11860240B2 (en) | 2016-07-01 | 2024-01-02 | Weber-Stephen Products Llc | Wireless control and status monitoring for electric grill with current protection circuitry |
| US12105572B2 (en) | 2016-07-01 | 2024-10-01 | Weber-Stephen Products Llc | Digital power supply with wireless monitoring and control |
| US12137832B2 (en) | 2016-07-01 | 2024-11-12 | Weber-Stephen Products Llc | Digital power supply |
| CN108808621A (en) * | 2017-05-05 | 2018-11-13 | 韦伯-斯蒂芬产品有限公司 | Wireless control and status monitoring for the electric oven with current protecting circuit |
| JP2018191504A (en) * | 2017-05-05 | 2018-11-29 | ウェーバー‐スティーブン プロダクツ エルエルシー | Radio control of electric grill having current protection circuit and situation monitoring |
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