CN107070259B - Power supply circuit for electric energy meter - Google Patents
Power supply circuit for electric energy meter Download PDFInfo
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- CN107070259B CN107070259B CN201611146135.4A CN201611146135A CN107070259B CN 107070259 B CN107070259 B CN 107070259B CN 201611146135 A CN201611146135 A CN 201611146135A CN 107070259 B CN107070259 B CN 107070259B
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- voltage stabilizing
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- power supply
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Classifications
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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
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
Abstract
The power supply circuit is used for the intelligent electric energy meter and comprises a transformer, a rectifying circuit and a voltage stabilizing circuit, wherein the voltage stabilizing circuit comprises a first voltage stabilizing circuit and a second voltage stabilizing circuit, and the transformer is sequentially connected with the rectifying circuit and the voltage stabilizing circuit; the primary coil of the transformer comprises a first coil and a second coil, the live wire L and the zero wire N of the power line are respectively connected with two ends of the first coil of the transformer, one end of the second coil of the transformer is connected with a node between the zero wire N of the power line, and the other end of the second coil of the transformer is respectively connected with a second voltage stabilizing circuit; the secondary coil of the transformer comprises a third coil and a fourth coil, and two ends of the third coil are connected with the rectifying circuit; both ends of the fourth coil are connected with the first voltage stabilizing circuit. The power supply circuit has the protection functions of lightning protection, zero line grounding prevention, zero line non-connection and the like, and has stronger anti-interference performance; the current is more stable, and the reliability of the electric energy meter is improved; and providing stable working voltage for each functional circuit or communication mode of the electric energy meter.
Description
Technical Field
The invention belongs to the technical field of electronic ammeter, and particularly relates to a power supply circuit for an electric energy meter.
Background
In daily life, the ordinary residential users are provided with the secondary electric energy meter, the common household electric energy meter is single in function, the wiring framework in the electric energy meter is reduced in order to reduce the occupied area of the PCB, the power circuit structure is simple, the stability and the anti-interference capability are poor, and the quality of the electronic electric energy meter is directly determined by the quality of the power system. In addition, along with the development and popularization of microelectronic technology and single chip microcomputer, the novel intelligent measurement and control technology is rapidly developed, the electronic electric energy meter taking the single chip microcomputer as a core shows obvious advantages, the traditional single power mode realizes the electric energy meter with single signal communication, the function is single, and the requirement of the existing social development cannot be met.
Disclosure of Invention
The invention aims to solve the problems of poor stability, single function and electromagnetic interference between circuits of the conventional power supply circuit, and provides a power supply circuit for an electric energy meter.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
the power supply circuit comprises a transformer, a rectifying circuit and a voltage stabilizing circuit, wherein the voltage stabilizing circuit comprises a first voltage stabilizing circuit and a second voltage stabilizing circuit, and the transformer is sequentially connected with the rectifying circuit and the voltage stabilizing circuit; the primary coil of the transformer comprises a first coil and a second coil, the live wire L and the zero wire N of the power line are respectively connected with two ends of the first coil of the transformer, one end of the second coil of the transformer is connected with a node between the zero wire N of the power line, and the other end of the second coil of the transformer is respectively connected with a second voltage stabilizing circuit; the secondary coil of the transformer comprises a third coil and a fourth coil, and two ends of the third coil are connected with the rectifying circuit; and two ends of the fourth coil are connected with the first voltage stabilizing circuit.
Further, the rectifying circuit comprises a rectifying bridge pile BD1 and an electrolytic capacitor EC1, the 6 pin and the 7 pin of the third coil are respectively connected with the 3 pin and the 4 pin of the input end of the rectifying bridge pile BD1, the positive electrode of the output end of the rectifying bridge pile BD1 is connected with the positive electrode of the electrolytic capacitor EC1, the negative electrode of the output end of the rectifying bridge pile BD1 is connected with the negative electrode of the electrolytic capacitor EC1, a power supply VDCC is output from a node between the positive electrode of the output end of the rectifying bridge pile BD1 and the positive electrode of the electrolytic capacitor EC1, and the node between the negative electrode of the output end of the rectifying bridge pile BD1 and the negative electrode of the electrolytic capacitor EC1 is grounded. The power supply VDCC output by the rectifying circuit supplies power for the carrier communication circuit and the load switch circuit.
Further, the first voltage stabilizing circuit includes a diode D3, a voltage stabilizing chip IC1, and a capacitor C51, the 9 pin and the 10 pin of the fourth coil are respectively connected with the positive pole of the diode D3 and the ground terminal 2 pin of the voltage stabilizing chip IC1, the negative pole of the diode D3 is connected with the input terminal 3 pin of the voltage stabilizing chip IC1, a capacitor C51 is serially connected between the ground terminal 2 pin of the voltage stabilizing chip IC1 and the output terminal 1 pin, a supply voltage +12v485 is output between the negative pole of the diode D3 and the input terminal 3 pin of the voltage stabilizing chip IC1, a supply voltage V485 is output at a node between the output terminal 1 pin of the voltage stabilizing chip IC1 and the capacitor C51, and a node between the ground terminal 2 pin of the voltage stabilizing chip IC1 and the capacitor C51 is grounded. (the ground is completely isolated from other digital ground and analog ground. The safety effect of preventing personal attack is taken.) the first voltage stabilizing circuit outputs voltage to supply power to the RS485 communication circuit after rectification by the diode D3 and voltage stabilization by the voltage stabilizing chip. The first voltage stabilizing circuit is connected with the RS485 communication circuit.
Furthermore, an electrolytic capacitor EC3 and a capacitor C44 are arranged in parallel between the ground terminal 2 pin of the voltage stabilizing chip IC1 and the input terminal 3 pin of the voltage stabilizing chip IC1, and the positive electrode of the electrolytic capacitor EC3 is connected with the input terminal 3 pin of the voltage stabilizing chip IC 1. EC3 and C44 have filtering decoupling function and stabilize the power supply circuit.
Further, the three circuits of the rectifying circuit, the first voltage stabilizing circuit and the second voltage stabilizing circuit are not commonly grounded. The voltage provided by the voltage circuit is stable and has good electromagnetic compatibility.
Further, the second voltage stabilizing circuit includes a diode D4, a voltage stabilizing chip IC2, and a capacitor C60, the 9 pin and the 10 pin of the fourth coil are respectively connected with the positive pole of the diode D3 and the ground terminal 2 pin of the voltage stabilizing chip IC2, the negative pole of the diode D4 is connected with the input terminal 3 pin of the voltage stabilizing chip IC2, a serial electrolytic capacitor EC5 and a capacitor C60 are connected in parallel between the ground terminal 2 pin and the output terminal 1 pin of the voltage stabilizing chip IC2, the positive pole of the electrolytic capacitor EC5 is connected with the output terminal 1 pin of the voltage stabilizing chip IC2, the node between the output terminal 1 pin of the voltage stabilizing chip IC2 and the capacitor C60 outputs a power supply voltage DVDD, and the node between the ground terminal 2 pin of the voltage stabilizing chip IC2, the electrolytic capacitor EC5 and the capacitor C60 is grounded. The power supply voltage DVDD is output to the intelligent circuit meter measuring chip circuit and the MCU chip part circuit after the rectification and voltage stabilization effect of the diode D3 and the voltage stabilization chip.
Furthermore, an electrolytic capacitor EC4 and a capacitor C58 are arranged in parallel between the ground terminal 2 pin of the voltage stabilizing chip IC2 and the input terminal 3 pin of the voltage stabilizing chip IC2, and the positive electrode of the electrolytic capacitor EC4 is connected with the input terminal 3 pin of the voltage stabilizing chip IC 2. The electrolytic capacitor EC4 and the capacitor C58 adopt capacitors with different sizes, have filtering decoupling function and stabilize the power supply circuit.
Further, the power supply circuit further comprises a power supply protection circuit, the power supply protection circuit comprises a piezoresistor RR1 and a thermistor RT1, the piezoresistor RR1 is connected in series between a live wire L line and a zero wire N line, two ends of the piezoresistor RR1 are respectively connected with a 5 pin and a 1 pin of a first coil of the transformer, and the thermistor RT1 is also connected between the piezoresistor RR1 and the 1 pin of the first coil.
Furthermore, a varistor Ra connected in parallel with the varistor RR1 is further arranged between the 5 pins and the 1 pin of the first coil of the transformer. The thermistor RT1 can also form three-leg components with the voltage dependent resistor Ra with the resistance value smaller than that of the thermistor RT1, and forms a more stable power protection circuit with the voltage dependent resistor RR 1. Particularly, the transformer and the whole power supply circuit are protected against lightning protection and zero line grounding or zero line non-connection. The thermistor RT1 is selected from three pins MZ1106E15 1-215 RM/10 D3 91.
Compared with the prior art, the invention has the beneficial effects that: the power supply circuit has the protection functions of lightning protection, zero line grounding prevention, zero line non-connection and the like, and has stronger anti-interference performance; the current is more stable, and the reliability of the electric energy meter is improved; and providing stable working voltage for each functional circuit or communication mode of the electric energy meter.
Drawings
Fig. 1 is a power circuit diagram of the present invention.
Detailed Description
The technical scheme of the invention is further described and illustrated by the following specific examples.
As shown in the figure, the power supply circuit comprises a power supply protection circuit, a transformer, a rectifying circuit, a first voltage stabilizing circuit and a second voltage stabilizing circuit, wherein a live wire L and a zero wire N are connected with a first coil of an input end of the transformer, a second coil of the input end of the transformer is connected with the second voltage stabilizing circuit, and a third coil and a fourth coil of an output end of the transformer are respectively connected with the rectifying circuit and the first voltage stabilizing circuit. The three circuits of the rectifying circuit, the first voltage stabilizing circuit and the second voltage stabilizing circuit are not commonly grounded. The power protection circuit is arranged between the live wire, the zero wire and the input end of the transformer.
In the rectifying circuit, 6 feet and 7 feet of the third coil are respectively connected with 3 feet and 4 feet of an input end of the rectifying bridge pile BD1, the positive electrode of an output end of the rectifying bridge pile BD1 is connected with the positive electrode of the electrolytic capacitor EC1, the negative electrode of the output end of the rectifying bridge pile BD1 is connected with the negative electrode of the electrolytic capacitor EC1, a power supply VDCC is output by a node between the positive electrode of the output end of the rectifying bridge pile BD1 and the positive electrode of the electrolytic capacitor EC1, and the node between the negative electrode of the output end of the rectifying bridge pile BD1 and the negative electrode of the electrolytic capacitor EC1 is grounded.
In the first voltage stabilizing circuit, a pin 9 and a pin 10 of a fourth coil are respectively connected with the positive electrode of a diode D3 and the ground end 2 pin of a voltage stabilizing chip IC1, the negative electrode of the diode D3 is connected with the input end 3 pin of the voltage stabilizing chip IC1, a capacitor C51 is connected in series between the ground end 2 pin and the output end 1 pin of the voltage stabilizing chip IC1, a power supply voltage +12V485 is output between the negative electrode of the diode D3 and the input end 3 pin of the voltage stabilizing chip IC1, a power supply voltage V485 is output at a node between the output end 1 pin of the voltage stabilizing chip IC1 and the capacitor C51, and a node between the ground end 2 pin of the voltage stabilizing chip IC1 and the capacitor C51 is grounded. An electrolytic capacitor EC3 and a capacitor C44 are arranged in parallel between the ground terminal 2 pin of the voltage stabilizing chip IC1 and the input terminal 3 pin of the voltage stabilizing chip IC1, and the anode of the electrolytic capacitor EC3 is connected with the input terminal 3 pin of the voltage stabilizing chip IC 1.
In the second voltage stabilizing circuit, a pin 9 and a pin 10 of a fourth coil are respectively connected with the positive electrode of a diode D3 and the ground end 2 pin of a voltage stabilizing chip IC2, the negative electrode of a diode D4 is connected with the input end 3 pin of the voltage stabilizing chip IC2, a series electrolytic capacitor EC5 and a capacitor C60 are connected in parallel between the ground end 2 pin and the output end 1 pin of the voltage stabilizing chip IC2, the positive electrode of the electrolytic capacitor EC5 is connected with the output end 1 pin of the voltage stabilizing chip IC2, a node between the output end 1 pin of the voltage stabilizing chip IC2 and the capacitor C60 outputs a power supply voltage DVDD, and the node between the ground end 2 pin of the voltage stabilizing chip IC2, the electrolytic capacitor EC5 and the capacitor C60 is grounded (is the analog ground of a metering chip of an electric energy meter). An electrolytic capacitor EC4 and a capacitor C58 are arranged in parallel between the ground terminal 2 pin of the voltage stabilizing chip IC2 and the input terminal 3 pin of the voltage stabilizing chip IC2, and the anode of the electrolytic capacitor EC4 is connected with the input terminal 3 pin of the voltage stabilizing chip IC 2.
The power supply protection circuit comprises a piezoresistor RR1 and a thermistor RT1, wherein the piezoresistor RR1 is connected in series between a live wire L line and a zero wire N line, two ends of the piezoresistor RR1 are respectively connected with a pin 5 and a pin 1 of a first coil of the transformer, and the thermistor RT1 is also connected between the piezoresistor RR1 and the pin 1 of the first coil.
The primary winding input of the transformer is 220VAC, the output of the 6 th pin and the 7 th pin of the secondary winding is 8V/220MA, and the output of the 9 th pin and the 10 th pin of the secondary winding is 11V/20mA. The varistor RR1 is a varistor S20K 420. The capacitor EC1 is 1000UF/35V/WL 12.5.25, and the rectifier bridge BD1 is MB10S MBS. Diode D3 and diode D4 are M7DO-214AC, capacitor EC4 is 220UF/35V/WL 10 x 12.5, capacitor EC3 is 100UF/50V/WL 8 x 11.5, capacitor EC5 is 100UF//10V/WL 5 x 11, and capacitor C44, capacitor C58, capacitor C51 and capacitor C60 are all 100NF 10%0603. The voltage stabilizing chip IC1 and the voltage stabilizing chip IC2 are 78L05SOT-89 long-electric type. The thermistor RT1 is selected from three pins MZ1106E15 1-215 RM/10 D3 91.
The rectification circuit of the power supply circuit is connected with the carrier communication module, the first voltage stabilizing circuit of the power supply circuit is connected with the RS485 communication module, and the second voltage stabilizing circuit is connected with the metering chip module. The metering chip module comprises a current sampling circuit of a zero line and a current sampling circuit of a fire wire.
The carrier communication module, the RS485 communication module and the metering chip module in this embodiment are common modules in the field.
The above description is not intended to limit the scope of the invention, but is intended to cover modifications and improvements made by those skilled in the art in light of the present teachings.
Claims (7)
1. The power supply circuit used on the intelligent electric energy meter is characterized by comprising a transformer, a rectifying circuit and a voltage stabilizing circuit, wherein the voltage stabilizing circuit comprises a first voltage stabilizing circuit and a second voltage stabilizing circuit, and the transformer is sequentially connected with the rectifying circuit and the voltage stabilizing circuit; the primary coil of the transformer comprises a first coil and a second coil, the live wire L and the zero wire N of the power line are respectively connected with two ends of the first coil of the transformer, one end of the second coil of the transformer is connected with a node between the zero wire N of the power line, and the other end of the second coil of the transformer is respectively connected with a second voltage stabilizing circuit; the secondary coil of the transformer comprises a third coil and a fourth coil, and two ends of the third coil are connected with the rectifying circuit; two ends of the fourth coil are connected with the first voltage stabilizing circuit; the power supply circuit further comprises a power supply protection circuit, the power supply protection circuit comprises a piezoresistor RR1 and a thermistor RT1, the piezoresistor RR1 is connected in series between a live wire L line and a zero wire N line, two ends of the piezoresistor RR1 are respectively connected with a pin 5 and a pin 1 of a first coil of the transformer, and the thermistor RT1 is also connected between the piezoresistor RR1 and the pin 1 of the first coil; a piezoresistor Ra connected in parallel with the piezoresistor RR1 is also arranged between the pin 5 and the pin 1 of the first coil of the transformer; the second voltage stabilizing circuit comprises a diode D4, a voltage stabilizing chip IC2 and a capacitor C60, wherein the pin 9 and the pin 10 of the fourth coil are respectively connected with the positive electrode of the diode D3 and the pin 2 of the grounding end of the voltage stabilizing chip IC2, the negative electrode of the diode D4 is connected with the pin 3 of the input end of the voltage stabilizing chip IC2, a series electrolytic capacitor EC5 and a capacitor C60 are arranged in parallel between the pin 2 of the grounding end and the pin 1 of the output end of the voltage stabilizing chip IC2, the positive electrode of the electrolytic capacitor EC5 is connected with the pin 1 of the output end of the voltage stabilizing chip IC2, the node between the pin 1 of the output end of the voltage stabilizing chip IC2 and the capacitor C60 outputs a power supply voltage DVDD, and the node between the pin 2 of the grounding end of the voltage stabilizing chip IC2, the electrolytic capacitor EC5 and the capacitor C60 is grounded; the power supply voltage DVDD is output to the intelligent circuit meter measuring chip circuit and the MCU chip part circuit after the rectification and voltage stabilization effect of the diode D3 and the voltage stabilization chip.
2. The power supply circuit for the intelligent ammeter according to claim 1, wherein the rectifying circuit comprises a rectifying bridge BD1 and an electrolytic capacitor EC1, the 6 pin and the 7 pin of the third coil are respectively connected with the 3 pin and the 4 pin of the input end of the rectifying bridge BD1, the positive electrode of the output end of the rectifying bridge BD1 is connected with the positive electrode of the electrolytic capacitor EC1, the negative electrode of the output end of the rectifying bridge BD1 is connected with the negative electrode of the electrolytic capacitor EC1, a node between the positive electrode of the output end of the rectifying bridge BD1 and the positive electrode of the electrolytic capacitor EC1 outputs a power supply VDCC, and a node between the negative electrode of the output end of the rectifying bridge BD1 and the negative electrode of the electrolytic capacitor EC1 is grounded.
3. The power supply circuit for the intelligent ammeter according to claim 2, wherein the first voltage stabilizing circuit comprises a diode D3, a voltage stabilizing chip IC1 and a capacitor C51, pins 9 and 10 of the fourth coil are respectively connected with the positive pole of the diode D3 and the ground terminal 2 pin of the voltage stabilizing chip IC1, the negative pole of the diode D3 is connected with the input terminal 3 pin of the voltage stabilizing chip IC1, the capacitor C51 is connected in series between the ground terminal 2 pin and the output terminal 1 pin of the voltage stabilizing chip IC1, a power supply voltage +12v485 is output between the negative pole of the diode D3 and the input terminal 3 pin of the voltage stabilizing chip IC1, a power supply voltage V485 is output at a node between the output terminal 1 pin of the voltage stabilizing chip IC1 and the capacitor C51, and a node between the ground terminal 2 pin of the voltage stabilizing chip IC1 and the capacitor C51 is grounded.
4. The power supply circuit for an intelligent electric energy meter according to claim 3, wherein an electrolytic capacitor EC3 and a capacitor C44 are arranged in parallel between the ground terminal 2 pin of the voltage stabilizing chip IC1 and the input terminal 3 pin of the voltage stabilizing chip IC1, and the positive electrode of the electrolytic capacitor EC3 is connected with the input terminal 3 pin of the voltage stabilizing chip IC 1.
5. The power circuit for an intelligent ammeter according to claim 1, wherein the three circuits of the rectifying circuit, the first voltage stabilizing circuit and the second voltage stabilizing circuit are not commonly grounded.
6. The power supply circuit for the intelligent ammeter according to claim 1, wherein an electrolytic capacitor EC4 and a capacitor C58 are arranged in parallel between the ground terminal 2 pin of the voltage stabilizing chip IC2 and the input terminal 3 pin of the voltage stabilizing chip IC2, and the positive electrode of the electrolytic capacitor EC4 is connected with the input terminal 3 pin of the voltage stabilizing chip IC 2.
7. The power supply circuit for intelligent ammeter according to claim 1, wherein the thermistor RT1 is selected from MZ1106E15 1-215 RM/10 D3 91 three pins.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611146135.4A CN107070259B (en) | 2016-12-13 | 2016-12-13 | Power supply circuit for electric energy meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611146135.4A CN107070259B (en) | 2016-12-13 | 2016-12-13 | Power supply circuit for electric energy meter |
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| Publication Number | Publication Date |
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| CN107070259A CN107070259A (en) | 2017-08-18 |
| CN107070259B true CN107070259B (en) | 2023-08-25 |
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| CN201611146135.4A Active CN107070259B (en) | 2016-12-13 | 2016-12-13 | Power supply circuit for electric energy meter |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108092529A (en) * | 2017-12-27 | 2018-05-29 | 浙江恒业电子有限公司 | A kind of Three phase electrical energy meter electricity source circuit |
| CN108233722B (en) * | 2018-03-23 | 2024-01-16 | 鲁东大学 | DC-DC direct-current voltage-stabilizing multipath power supply output circuit |
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| CN206650592U (en) * | 2016-12-13 | 2017-11-17 | 浙江恒业电子有限公司 | Power circuit for electric energy meter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108667292B (en) * | 2018-05-18 | 2022-02-15 | 重庆斯微奇电子技术有限公司 | Input voltage feedforward voltage type PWM control circuit |
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| CN2552047Y (en) * | 2002-06-19 | 2003-05-21 | 深圳市跨宏实业有限公司 | Switch power with wide input voltage range |
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