CN114400907A - Radiation-resistant three-phase diode series dual-protection rectifying circuit - Google Patents
Radiation-resistant three-phase diode series dual-protection rectifying circuit Download PDFInfo
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- CN114400907A CN114400907A CN202111503711.7A CN202111503711A CN114400907A CN 114400907 A CN114400907 A CN 114400907A CN 202111503711 A CN202111503711 A CN 202111503711A CN 114400907 A CN114400907 A CN 114400907A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
- H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
- H02M7/06—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/044—Physical layout, materials not provided for elsewhere
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
- H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
- H02M7/06—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
- H02M7/062—Avoiding or suppressing excessive transient voltages or currents
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
Abstract
The invention provides an irradiation-resistant three-phase diode series double-protection rectifying circuit, which comprises: the input end of the first protection module is connected with a three-phase power supply, and the input end of the first protection module is used for performing anti-surge protection on three-phase voltage output by the three-phase power supply; the input end of the rectification output module is connected with the output end of the first protection module, the first output end of the rectification output module is connected with an external device, and the output voltage of the first protection module is rectified and supplies power to the external device through a plurality of diodes which are connected in series in pairs; and the input end of the second protection module is connected with the second output end of the rectification output module, the output end of the second protection module is grounded, and the circuit is subjected to anti-surge protection on the ground through the second protection module. The circuit has the advantages that the surge protection of three-phase voltage is realized by arranging the piezoresistor between the phase and the phase of the three-phase power supply, and the surge protection of the ground is realized by arranging the piezoresistor and the safety capacitor between the cathode output port and the grounding port.
Description
Technical Field
The invention relates to the technical field of three-phase rectifying circuits, in particular to an irradiation-resistant three-phase diode series double-protection rectifying circuit.
Background
The three-phase rectifier circuit is a circuit which carries out filtering rectification on input three-phase voltage and then outputs the three-phase voltage to an external device for power supply, and the three-phase rectifier circuit is used as a power supply end of the external device and has no negligibility to the safety problem of power supply.
However, most of the existing three-phase rectification circuits only rely on fuses or fuses for circuit protection, and the input three-phase voltage does not have a good anti-surge protection function, and the input three-phase voltage does not have a protection function at a circuit and a grounding end, so that the circuit is likely to be damaged.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an irradiation-resistant three-phase diode series double-protection rectifying circuit, which comprises:
the input end of the first protection module is connected with a three-phase power supply, and the first protection module is used for performing anti-surge protection on three-phase voltage output by the three-phase power supply;
the input end of the rectification output module is connected with the output end of the first protection module, the first output end of the rectification output module is connected with an external device, the rectification output module comprises a plurality of diodes which are connected in series in pairs, and the diodes rectify the output voltage of the first protection module and supply power to the external device;
and the input end of the second protection module is connected with the second output end of the rectification output module, the output end of the second protection module is grounded, and the circuit is subjected to anti-surge protection on the ground through the second protection module.
Preferably, the first protection module includes:
one end of the first fuse is connected with a first input port, and the other end of the first fuse is connected with a first input end of the rectification output module;
one end of the second fuse is connected with a second input port, and the other end of the second fuse is connected with a second input end of the rectification output module;
one end of the third fuse is connected with a third input port, and the other end of the third fuse is connected with a third input end of the rectification output module;
the first input port, the second input port and the third input port are used as input ends of the first protection module, and the other end of the first fuse, the other end of the second fuse and the other end of the third fuse are used as output ends of the first protection module;
when the three-phase voltage output by the three-phase power supply is larger than the fusing values of the first fuse, the second fuse and the third fuse, the first fuse, the second fuse and the third fuse control the circuit to be disconnected so as to perform overvoltage protection on the circuit.
Preferably, the first protection module further includes:
one end of the first voltage dependent resistor is respectively connected with the other end of the first fuse and the first input end of the rectification output module;
the second piezoresistor is connected in parallel with two ends of the first piezoresistor, one end of the second piezoresistor is respectively connected with one end of the first piezoresistor and the first input end of the rectification output module, and the other end of the first piezoresistor is respectively connected with the other end of the first piezoresistor and the second input end of the rectification output module;
one end of the third voltage dependent resistor is connected with the other end of the second fuse and the second input end of the rectification output module respectively, and the other end of the third voltage dependent resistor is connected with the other end of the third fuse and the third input end of the rectification output module respectively;
and the first voltage dependent resistor, the second voltage dependent resistor and the third voltage dependent resistor are used for carrying out anti-surge protection on the circuit.
Preferably, the first fuse, the second fuse and the third fuse are overcurrent fuses of 3.15 amperes and 500 volt specifications.
Preferably, the rectification output module includes:
the cathode of the first diode is connected with an anode output port;
the cathode of the second diode is connected with the anode of the first diode;
the cathode of the third diode is respectively connected with the output end of the first protection module and the anode of the second diode;
a cathode of the fourth diode is connected with an anode of the third diode, and an anode of the fourth diode is connected with a cathode output port;
a cathode of the fifth diode is connected with the anode output port;
the cathode of the sixth diode is connected with the anode of the fifth diode;
the cathode of the seventh diode is respectively connected with the output end of the first protection module and the anode of the sixth diode;
the cathode of the eighth diode is connected with the anode of the seventh diode, and the anode of the eighth diode is connected with the cathode output port;
a ninth diode, a cathode of the ninth diode is connected to the anode output port;
the cathode of the fifth diode is connected with the anode of the ninth diode;
the cathode of the eleventh diode is respectively connected with the output end of the first protection module and the anode of the twelfth diode;
a cathode of the twelfth diode is connected with an anode of the eleventh diode, and an anode of the twelfth diode is connected with the cathode output port;
an anode of the second diode and a cathode of the third diode serve as the first input end of the rectification output module, an anode of the sixth diode and a cathode of the seventh diode serve as the second input end of the rectification output module, an anode of the twelfth diode and the third input end of the eleventh diode serve as the anode output port and the cathode output port serve as the first output end of the rectification output module, and a cathode of the ninth diode and an anode of the twelfth diode serve as the second output end of the rectification output module;
the first diode, the second diode, the third diode, the fourth diode, the fifth diode, the sixth diode, the seventh diode, the eighth diode, the ninth diode, the twelfth diode, the eleventh diode, and the twelfth diode constitute a rectifier bridge circuit, and the output voltage of the first protection module is rectified by the rectifier bridge circuit and output to the external device.
Preferably, the rectification output module further includes:
one end of the first capacitor is connected with the cathode of the ninth diode and the anode output port respectively, and the other end of the first capacitor is connected with the anode of the twelfth diode and the cathode output port respectively;
the second capacitor is connected in parallel with two ends of the first capacitor;
the third capacitor is connected in parallel with two ends of the second capacitor;
the fourth capacitor is connected in parallel with two ends of the third capacitor;
the first capacitor, the second capacitor, the third capacitor and the fourth capacitor form a filter circuit, and the output voltage of the rectifier bridge circuit is filtered by the filter circuit and is output to the external device.
Preferably, the first diode, the second diode, the third diode, the fourth diode, the fifth diode, the sixth diode, the seventh diode, the eighth diode, the ninth diode, the twelfth diode, the eleventh diode, and the twelfth diode are all fast recovery diodes.
Preferably, the first capacitor, the second capacitor, the third capacitor and the fourth capacitor are all ceramic chip filter capacitors.
Preferably, the second protection module includes:
one end of the fourth voltage dependent resistor is connected with the second output end of the rectification output module, and the other end of the fourth voltage dependent resistor is connected with a grounding port;
one end of the fifth capacitor is connected with the second output end of the rectification output module;
one end of the sixth capacitor is connected with the other end of the fifth capacitor, and the other end of the sixth capacitor is respectively connected with the other end of the fourth piezoresistor and the grounding port;
one end of the fourth piezoresistor is used as the input end of the second protection module, and the grounding port is used as the output end of the second protection module;
and the fourth piezoresistor, the fifth capacitor and the sixth capacitor are used for carrying out anti-surge protection on the circuit to the ground.
Preferably, the fifth capacitor and the sixth capacitor are Y-type safety capacitors.
The technical scheme has the following advantages or beneficial effects: the circuit realizes the anti-surge protection of the output voltage of the three-phase power supply by connecting the piezoresistor in parallel between the phase and the phase of the three-phase power supply, realizes the anti-surge protection of the ground by arranging the piezoresistor and the safety capacitor between the cathode output port and the grounding port, and adopts the fast recovery diodes which are connected in series in pairs, thereby not only improving the rectification effect, but also meeting the requirement of radiation resistance.
Drawings
FIG. 1 is an electrical schematic diagram of the present circuit in a preferred embodiment of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present invention is not limited to the embodiment, and other embodiments may be included in the scope of the present invention as long as the gist of the present invention is satisfied.
In a preferred embodiment of the present invention, based on the above problems in the prior art, there is provided an irradiation-resistant three-phase diode series dual-protection rectifier circuit, as shown in fig. 1, including:
the input end of the first protection module 1 is connected with a three-phase power supply, and the first protection module 1 is used for performing anti-surge protection on three-phase voltage output by the three-phase power supply;
the input end of the rectification output module 2 is connected with the output end of the first protection module 1, the first output end of the rectification output module 2 is connected with an external device, the rectification output module comprises a plurality of diodes which are connected in series in pairs, and the diodes rectify the output voltage of the first protection module 1 and supply power to the external device;
and the input end of the second protection module 3 is connected with the second output end of the rectification output module 2, the output end of the second protection module 3 is grounded, and the circuit is subjected to anti-surge protection on the ground through the second protection module 3.
In a preferred embodiment of the present invention, the first protection module 1 comprises:
a first fuse F1, one end of the first fuse F1 is connected to a first input port L1, and the other end of the first fuse F1 is connected to the first input end of the rectification output module 2;
one end of a second fuse F2, one end of the second fuse F2 is connected to a second input port L2, and the other end of the second fuse F2 is connected to a second input end of the rectification output module 2;
one end of a third fuse F3, one end of the third fuse F3 is connected to a third input port L3, and the other end of the third fuse F3 is connected to a third input end of the rectification output module 2;
the first input port L1, the second input port L2, and the third input port L3 serve as input ends of the first protection module 1, and the other end of the first fuse F1, the other end of the second fuse F2, and the other end of the third fuse F3 serve as output ends of the first protection module 1;
when the three-phase voltage output by the three-phase power supply is greater than the fusing values of the first fuse F1, the second fuse F2 and the third fuse F3, the first fuse F1, the second fuse F2 and the third fuse F3 control the open circuit to perform overvoltage protection on the circuit.
Specifically, in the present embodiment, the first input port L1, the second input port L2, and the third input port L3 are used to input a three-phase voltage of 380 volts.
In a preferred embodiment of the present invention, the first protection module 1 further includes:
one end of the first voltage dependent resistor RV1 is connected to the other end of the first fuse F1 and the first input end of the rectification output module 2 respectively, and one end of the first voltage dependent resistor RV1 is connected to the second input end of the first fuse F1;
the second piezoresistor RV2, the second piezoresistor RV2 is connected in parallel with two ends of the first piezoresistor RV1, one end of the second piezoresistor RV2 is respectively connected with one end of the first piezoresistor RV1 and the first input end of the rectification output module 2, and the other end of the first piezoresistor RV1 is respectively connected with the other end of the first piezoresistor RV1 and the second input end of the rectification output module 2;
one end of a third voltage dependent resistor RV3, one end of the third voltage dependent resistor RV3 is respectively connected with the other end of the second fuse F2 and the second input end of the rectification output module 2, and the other end of the third voltage dependent resistor RV3 is respectively connected with the other end of the third fuse F3 and the third input end of the rectification output module 2;
the circuit is protected from surge through the first piezoresistor RV1, the second piezoresistor RV2 and the third piezoresistor RV 3.
Specifically, in the present embodiment, the first varistor RV1, the second varistor RV2, and the third varistor RV3 are all 1000VR varistors.
Preferably, the surge protection of the output voltage of the three-phase power supply is realized by connecting a voltage dependent resistor in parallel between the phases of the three-phase power supply.
Preferably, the varistor is a device having a transient voltage simulation function, and prevents the circuit from being damaged due to electrostatic discharge, surge and other transient currents, when the voltage across the varistor is higher than a certain value, the resistance of the varistor decreases rapidly, and a large current is conducted, so as to protect the circuit, and when the voltage across the varistor is lower than the working voltage value of the varistor, the resistance of the varistor is very high and is approximately open, so that the normal operation of the circuit is not affected.
In the preferred embodiment of the present invention, the first fuse F1, the second fuse F2 and the third fuse F3 are overcurrent fuses of 3.15 ampere and 500 volt specifications.
In a preferred embodiment of the present invention, the rectification output module 2 includes:
a first diode D1, wherein the cathode of the first diode D1 is connected with an anode output port V +;
a second diode D2, wherein the cathode of the second diode D2 is connected to the anode of the first diode D1;
a third diode D3, wherein the cathode of the third diode D3 is connected to the output terminal of the first protection module 1 and the anode of the second diode D2, respectively;
a fourth diode D4, wherein the cathode of the fourth diode D4 is connected to the anode of the third diode D3, and the anode of the fourth diode D4 is connected to a cathode output port V-;
a fifth diode D5, wherein the cathode of the fifth diode D5 is connected with the positive output port V +;
a sixth diode D6, wherein the cathode of the sixth diode D6 is connected to the anode of the fifth diode D5;
a seventh diode D7, wherein the cathode of the seventh diode D7 is connected to the output terminal of the first protection module 1 and the anode of the sixth diode D6, respectively;
an eighth diode D8, wherein the cathode of the eighth diode D8 is connected with the anode of the seventh diode D7, and the anode of the eighth diode D8 is connected with the cathode output port V-;
a ninth diode D9, wherein the cathode of the ninth diode D9 is connected to the positive output port V +;
a twelfth diode D10, the cathode of the twelfth diode D10 is connected to the anode of the ninth diode D9;
an eleventh diode D11, wherein the cathode of the eleventh diode D11 is connected to the output terminal of the first protection module 1 and the anode of the twelfth diode D10, respectively;
a twelfth diode D12, wherein the cathode of the twelfth diode D12 is connected with the anode of the eleventh diode D11, and the anode of the twelfth diode D12 is connected with the cathode output port V-;
the anode of the second diode D2 and the cathode of the third diode D3 are used as the first input end of the rectification output module 2, the anode of the sixth diode D6 and the cathode of the seventh diode D7 are used as the second input end of the rectification output module 2, the anode of the twelfth diode D10 and the third input end of the eleventh diode D11, the anode output port V + and the cathode output port V-are used as the first output end of the rectification output module 2, and the cathode of the ninth diode D9 and the anode of the twelfth diode D12 are used as the second output end of the rectification output module 2;
the first diode D1, the second diode D2, the third diode D3, the fourth diode D4, the fifth diode D5, the sixth diode D6, the seventh diode D7, the eighth diode D8, the ninth diode D9, the twelfth diode D10, the eleventh diode D11, and the twelfth diode D12 constitute a rectifier bridge circuit, and the output voltage of the first protection module 1 is rectified by the rectifier bridge circuit and output to an external device.
Specifically, in this embodiment, in the circuit, the first diode D1 is connected in series with the second diode D2, the third diode D3 is connected in series with the fourth diode D4, the fifth diode D5 is connected in series with the sixth diode D6, the seventh diode D7 is connected in series with the eighth diode D8, the ninth diode D9 is connected in series with the twelfth diode D10, and the eleventh diode D11 is connected in series with the twelfth diode D12, so as to form a rectifier bridge circuit, which makes the withstand voltage of the circuit higher and the performance more stable.
In a preferred embodiment of the present invention, the rectification output module 2 further includes:
one end of the first capacitor C1 is connected with a cathode and an anode output port V & lt- & gt of the ninth diode D9, and the other end of the first capacitor C1 is connected with an anode and a cathode output port V & lt- & gt of the twelfth diode D12;
a second capacitor C2, the second capacitor C2 is connected in parallel to two ends of the first capacitor C1;
a third capacitor C3, the third capacitor C3 is connected in parallel to two ends of the second capacitor C2;
a fourth capacitor C4, the fourth capacitor C4 is connected in parallel to two ends of the third capacitor C3;
the first capacitor C1, the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 form a filter circuit, and the output voltage of the rectifier bridge circuit is filtered by the filter circuit and is output to an external device.
In the preferred embodiment of the present invention, the first diode D1, the second diode D2, the third diode D3, the fourth diode D4, the fifth diode D5, the sixth diode D6, the seventh diode D7, the eighth diode D8, the ninth diode D9, the twelfth diode D10, the eleventh diode D11, and the twelfth diode D12 are all fast recovery diodes.
Specifically, in this embodiment, considering that the conventional rectifier diode cannot meet the irradiation requirement of 50KGy, the fast recovery diode is adopted in this embodiment to achieve the irradiation resistance requirement.
In the preferred embodiment of the present invention, the first capacitor C1, the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 are all ceramic filter capacitors.
Specifically, in this embodiment, four ceramic filter capacitors are connected in parallel between the positive output port V + and the negative output port V-for filtering, and considering that the conventional electrolytic capacitor or thin film capacitor cannot meet the irradiation requirement of 50KGy, the ceramic filter capacitors are adopted to achieve the irradiation resistance function.
In a preferred embodiment of the present invention, the second protection module 3 comprises:
one end of the fourth piezoresistor RV4 is connected with the second output end of the rectification output module 2, and the other end of the fourth piezoresistor RV4 is connected with a grounding port PD;
one end of the fifth capacitor CY1 is connected to the second output end of the rectification output module 2, and one end of the fifth capacitor CY1 is connected to the second output end of the rectification output module 2;
one end of a sixth capacitor CY2, one end of a sixth capacitor CY2 is connected to the other end of the fifth capacitor CY1, and the other end of the sixth capacitor CY2 is connected to the other end of the fourth varistor RV4 and the ground port PD;
one end of the fourth piezoresistor RV4 is used as the input end of the second protection module 3, and the ground port PD is used as the output end of the second protection module 3;
the circuit is protected against surge to the ground through the fourth piezoresistor RV4, the fifth capacitor CY1 and the sixth capacitor CY 2.
Specifically, in this embodiment, a fourth voltage dependent resistor RV4, a fifth capacitor CY1, and a sixth capacitor CY2 are disposed between the ground port PD and the negative output port V-, and the negative output port V-to-ground anti-surge protection is implemented by connecting the fourth voltage dependent resistor RV4, the fifth capacitor CY1, and the sixth capacitor CY2 in parallel.
In the preferred embodiment of the present invention, the fifth capacitor CY1 and the sixth capacitor CY2 are Y-type safety capacitors.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (10)
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111503711.7A CN114400907A (en) | 2021-12-09 | 2021-12-09 | Radiation-resistant three-phase diode series dual-protection rectifying circuit |
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| CN202111503711.7A CN114400907A (en) | 2021-12-09 | 2021-12-09 | Radiation-resistant three-phase diode series dual-protection rectifying circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114726242A (en) * | 2022-04-27 | 2022-07-08 | 华荣科技股份有限公司 | A radiation-resistant three-phase multiple protection rectifier circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114726242A (en) * | 2022-04-27 | 2022-07-08 | 华荣科技股份有限公司 | A radiation-resistant three-phase multiple protection rectifier circuit |
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Effective date of registration: 20220920 Address after: 201808 No. 555 treasure road, Shanghai, Jiading District Applicant after: Warom Technology Incorporated Company Applicant after: Mingzhi electrical appliances (Taicang) Co.,Ltd. Address before: 201808 No. 555 treasure road, Shanghai, Jiading District Applicant before: Warom Technology Incorporated Company |
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Inventor after: Zhao Apeng Inventor after: Huang Haihua Inventor after: Liu Gang Inventor after: Wang Yade Inventor after: Zhang Minggao Inventor after: Feng Xiaohua Inventor before: Wang Yade Inventor before: Zhou Qing Inventor before: Zhang Minggao Inventor before: Zheng Tianji Inventor before: Feng Xiaohua |
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Effective date of registration: 20241024 Address after: 518028, 15th Floor, Shenzhen Science and Technology Building, West Shangbu Middle Road, Futian District, Shenzhen City, Guangdong Province (1502-1504, 1506) Applicant after: CHINA NUCLEAR POWER TECHNOLOGY RESEARCH INSTITUTE Co.,Ltd. Country or region after: China Address before: 201808 No. 555 treasure road, Shanghai, Jiading District Applicant before: Warom Technology Incorporated Company Country or region before: China Applicant before: Mingzhi electrical appliances (Taicang) Co.,Ltd. |
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Application publication date: 20220426 |