CN101742793B - Special high-voltage power supply of zinc element hollow cathode lamp - Google Patents
Special high-voltage power supply of zinc element hollow cathode lamp Download PDFInfo
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- CN101742793B CN101742793B CN 200910260201 CN200910260201A CN101742793B CN 101742793 B CN101742793 B CN 101742793B CN 200910260201 CN200910260201 CN 200910260201 CN 200910260201 A CN200910260201 A CN 200910260201A CN 101742793 B CN101742793 B CN 101742793B
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Abstract
The invention relates to a special high-voltage power supply of a zinc element hollow cathode lamp, which comprises a power supply circuit, wherein the power supply circuit is installed in a shell, and connectors and a connector state indicating lamp are welded on the power supply circuit; the power supply circuit forms a closed loop circuit by an auxiliary circuit, a prestabilizing control circuit, a prestabilizing drive circuit, an output control and feedback circuit and an output drive and output circuit; and the prestabilizing control circuit is connected with the prestabilizing drive circuit. The overall unit has the internal adjustment and external monitoring function on an anode current (a lamp current), good long-term stability, small temperature drift, high reliability, compact structure, small overall dimension relative to similar units, lighter weight and easy installation; and the output anode current has small ripple wave and high stabilized current precision.
Description
Technical field
The present invention relates to a kind of special high-voltage power supply of zinc element hollow cathode lamp that is widely used in Atomic Absorption Spectrometer, atomic absorption spectrophotometer, the atomic fluorescence analysis instrument.
Background technology
Existing zinc element hollow cathode lamp power source special product, control section adopt mostly that pulse-width modulation (PWM) mode is controlled, regulation output voltage and electric current.Owing to there being larger load dynamic range in the process of zinc lamp load from the build-up of luminance to the steady operation, and this single control mode can cause load effective power to descend, also can reduce the conversion efficiency of power supply and the useful life of lamp simultaneously, machine loss is increased, volume increases, and the stability of long-term work and reliability are affected.
Summary of the invention
In view of the deficiency that prior art exists, the invention provides a kind of circuit design rationally, reliability and the high special high-voltage power supply of zinc element hollow cathode lamp of stability.
The present invention for achieving the above object, the technical scheme of taking is: a kind of special high-voltage power supply of zinc element hollow cathode lamp, comprise the power circuit that is installed in the housing, it is characterized in that: be welded with connector, connector, connector status indicator lamp on the described power circuit; Power circuit forms closed loop circuit by auxiliary circuit, pre-steady control circuit, pre-steady drive circuit, output control and feedback circuit, output driving and output circuit, and pre-steady control circuit is connected with pre-steady drive circuit;
The termination Alternating Current Power Supply input L end of fuse F in the described auxiliary circuit, 1 pin of another termination alternating current filter FL, 2 pin of Alternating Current Power Supply input N termination alternating current filter FL, 3 pin of alternating current filter FL and 5 pin connect respectively 1 pin and 3 pin of rectifier bridge BG, 4 pin of alternating current filter FL connect the earth, and capacitor C 1 positive pole connects 2 pin of rectifier bridge BG, and the negative pole of capacitor C 1 links to each other with 4 pin of rectifier bridge BG and connects thermally;
2 pin of control chip U1 in the described pre-steady control circuit link to each other with 5 pin and connect thermally, the 1 pin difference connecting resistance R3 of control chip U1 and an end of capacitor C 7,4 pin of photoelectrical coupler U5, the other end of resistance R 3 and capacitor C 7 links to each other with 3 pin of photoelectrical coupler U5 and connects thermally, 1 pin of photoelectrical coupler U5 meets in-line power end Vcc, the end of the 6 pin connecting resistance R4 of control chip U1,7 pin of control chip U1 are the end of connecting resistance R1 respectively, the negative pole of capacitor C 5 positive poles and diode D3,8 pin of control chip U1 connect respectively the positive pole of capacitor C 4 and an end of resistance R 2, one end of another termination capacitor C 6 of resistance R 2 and 4 pin of control chip U1, the negative pole of capacitor C 4 and capacitor C 5 and the other end of capacitor C 6 link to each other and connect thermally, 2 pin of rectifier bridge BG in another termination auxiliary circuit of resistance R 1, the positive pole of diode D3 is the end of connecting resistance R5 respectively, the positive pole of the negative pole of diode D4 and capacitor C 8, the positive pole of another termination capacitor C 9 of resistance R 5 and the negative pole of diode D2, the positive pole of diode D2 connects 3 ends of ancillary coil, 4 termination capacitor C8 of ancillary coil and the negative pole of capacitor C 9, the positive pole of diode D4 reaches thermally;
After linking to each other, resistance R 6 in the described pre-steady drive circuit and an end of capacitor C 2 connect respectively 2 pin of rectifier bridge BG in 1 end of transformer TRF1 primary coil and the auxiliary circuit, after linking to each other, the other end of resistance R 6 and capacitor C 2 connects the negative pole of diode D1,2 ends of transformer TRF1 primary coil connect respectively the drain electrode of triode T1 and the positive pole of diode D1, the grid of triode T1 connects the other end of resistance R 4 in the pre-steady control circuit, the source electrode difference connecting resistance R7 of triode T1 and an end of resistance R 8, the other end of resistance R 7 connects respectively 3 pin of control chip U1 in an end of capacitor C 3 and the pre-steady control circuit, and resistance R 8 links to each other with the other end of capacitor C 3 and connects thermally;
13 pin of control chip U2 link to each other with 15 pin and meet in-line power end Vcc in described output control and the feedback circuit, 16 pin of control chip U2 connect the anodal of capacitor C 14 and as benchmark output Vr, the negative pole of capacitor C 14 connects cold ground, 1 pin of control chip U2 and 3 pin, 10 pin and 12 pin link to each other and connect cold ground, 6 pin of control chip U2 are by resistance R 21 ground connection, 7 pin of control chip U2 connect an end of capacitor C 21 and 5 pin of control chip U2 by resistance R 23,8 pin of control chip U2 connect an end of capacitor C 20, the 9 pin difference connecting resistance R22 of control chip U2 and an end of capacitor C 19, capacitor C 21, the other end of capacitor C 20 links to each other with the other end of resistance R 22 and capacitor C 19 and connects cold ground, the 1 pin difference connecting resistance R29 of amplifier U3A and an end of resistance R 30 and capacitor C 17, resistance R 29 links to each other with the other end of capacitor C 17 and connects respectively 2 pin of amplifier U3A and the end of resistance R 25 and R26, the 3 pin difference connecting resistance R27 of amplifier U3A and an end of R28 and capacitor C 18, another termination benchmark output Vr of resistance R 27, the other end of resistance R 28 connects cold ground by variable resistor W2, resistance R 26 links to each other with the other end of capacitor C 18 and connects cold ground, the base stage of another termination triode T4 of resistance R 30, triode T4 collector electrode connects cold ground, the emitter of triode T4 is by resistance R 31 2 pin of photoelectrical coupler U5 in the end of connecting resistance R24 and the pre-steady control circuit respectively, the positive pole of another terminating diode D6 of resistance R 24, the 7 pin difference connecting resistance R20 of amplifier U3B and an end of capacitor C 16, the negative pole of diode D6, resistance R 20 with connect 6 pin of amplifier U3B and an end of resistance R 19 after the other end of capacitor C 16 links to each other, the other end difference connecting resistance R17 of resistance R 19 and the end of R18, the pre-steady output Vout of another termination of resistance R 17,5 pin of amplifier U3B connect respectively an end of variable resistor W1 and resistance R 16, the cold ground of another termination of the other end of resistance R 16 and resistance R 18, the other end of variable resistor W1 meets benchmark output Vr by resistance R 15,1 pin of voltage stabilizing chip U4 meets pre-steady output Vout, 3 pin of U4 connect the anodal of capacitor C 15 and as in-line power end Vcc, the negative pole of capacitor C 15 connects 2 pin and the cold ground of voltage stabilizing chip U4,8 pin of amplifier U3A meet in-line power end Vcc, and 4 pin of amplifier U3A connect cold ground;
5 ends of transformer TRF1 secondary coil connect respectively the positive pole of capacitor C 10 and an end of inductance L 1 by diode D5 in described output driving and the output circuit, the other end of inductance L 1 connects respectively the positive pole of capacitor C 11, the pre-steady output end vo ut of one end of inductance L 2 and resistance R 32 and conduct, inductance L 2 other ends connect respectively the positive pole of capacitor C 12 and 2 ends of transformer TRF2 primary coil, capacitor C 10, the other end of the negative pole of capacitor C 11 and capacitor C 12 and resistance R 32 links to each other with 6 ends of transformer TRF1 secondary coil and connects cold ground, the drain electrode of triode T2 and triode T3 connects respectively 1 end and 3 ends of transformer TRF2 primary coil, the source electrode of triode T2 and triode T3 links to each other with an end of resistance R 11 and resistance R 12 and connects cold ground, the end of the grid difference connecting resistance R9 of triode T2 and the other end of resistance R 11, the end of the grid difference connecting resistance R10 of triode T3 and the other end of resistance R 12, the other end of resistance R 9 and resistance R 10 connects respectively 11 pin and 14 pin of control chip U2 in output control and the feedback circuit, 4 ends of transformer TRF2 secondary coil meet output Out1 by resistance R 13,5 ends of transformer TRF2 secondary coil connect respectively the positive pole of diode D7 and the negative pole of diode D8, the negative pole of diode D7 and diode D9 links to each other and an end of connecting resistance R14 and capacitor C 13 respectively, export the other end of resistance R 25 in control and the feedback circuit and export Idet as current detecting, the negative pole of the positive pole of diode D9 and diode D10 links to each other and as output Out2, the other end of the positive pole of diode D8 and diode D10 and resistance R 14 and capacitor C 13 links to each other and connects cold ground.
The invention has the beneficial effects as follows: complete machine antianode electric current (lamp current) has inner adjustable and external monitoring function; The anode current ripple of output is little, and precision of steady current is high; The long-time stability of complete machine are good, and temperature is floated little, and reliability is high; Compact overall structure, overall dimension is little on year-on-year basis, and weight is lighter, is easy to install.
Description of drawings
Fig. 1 is the main parallax stereogram of housing of the present invention.
Fig. 2 is the rear perspective view of housing of the present invention.
Fig. 3 is that circuit of the present invention connects block diagram and as Figure of abstract.
Fig. 4 is circuit theory diagrams of the present invention.
Embodiment
Shown in Fig. 1,2,3,4, special high-voltage power supply of zinc element hollow cathode lamp comprises the power circuit that is installed in the housing, it is characterized in that: be welded with connector 1, connector 2, connector 3 status indicator lamps 4 on the power circuit; Power circuit forms closed loop circuit by auxiliary circuit, pre-steady control circuit, pre-steady drive circuit, output control and feedback circuit, output driving and output circuit, and pre-steady control circuit is connected with pre-steady drive circuit;
The pre-steady output of this power supply adopts the current mode switch control chip of fixed frequency, regulates and control pre-steady output by its output duty cycle of FEEDBACK CONTROL.The sort circuit response time is fast, and current sense and limiting circuit are simple, flexible, can the establishment noise jamming.
The control chip of power supply complete machine output adopts fixed frequency, fixed pulse width, by FEEDBACK CONTROL, regulate the mode of its power supply amplitude.Sort circuit has very high conversion efficiency under larger load dynamic range.
Guarantee to input, export, the independent pathway between each ground of control etc.; Rational PCB layout; Good transformer production method; Select the components and parts of low noise, Low Drift Temperature, high stability; Insulation processing well; Improve the ground circuit structure design, ensure long-time stability and the reliability of complete machine power supply.
Work, the integrated design of build-up of luminance high pressure, complete machine adopts metal shell, and with frame ground, good electromagnetic shielding action is arranged, and improves the antijamming capability of power supply.
Operation principle:
Alternating Current Power Supply input (AC220V) obtains the approximately direct voltage of 300V by alternating current filter FL and rectifier bridge BG at capacitor C 1 two ends, as the power supply of pre-steady drive part.Simultaneously, start control chip U1 and complete machine power work through resistance R 1.
By control chip U1 and resistance R 2, capacitor C 6 grades form pre-steady control circuit, the control wave of exporting from 6 pin of control chip U1 is added on the grid of triode T1 pipe, and drive the primary coil of high frequency transformer TRF1 by its amplification, the sampled value that the triode T1 plumber who obtains from R8 simultaneously makes electric current is sent to 3 pin of control chip U1, the voltage of responding at the ancillary coil of transformer TRF1, by diode D2, capacitor C 9, resistance R 5, behind the rectifying and wave-filtering of diode D4 etc., again to control chip U1 power supply, as the voltage of keeping after the control chip U1 startup.
The control circuit that is comprised of control chip U2 and resistance R 21, capacitor C 21 etc. adopts open loop output, 11 pin and 14 pin by control chip U2, the control wave of output is added to respectively on the grid of triode T2 pipe and triode T3 pipe, and drive the primary coil of high frequency transformer TRF2 by their amplification, and the alternating voltage of the secondary coil of transformer TRF1 output, by rectification and the filtering of diode D5, capacitor C 10, inductance L 1, inductance L 2 etc., the direct voltage of acquisition is as the power supply of output driving part.
The ac high-voltage that produces at the secondary coil of transformer TRF2 is as the output of zinc lamp power supply, the lamp current of output, by diode D7, diode D8, diode D9, after the rectification of diode D10, current sampling signal in resistance R 14 acquisitions, by by resistance R 25, resistance R 26, resistance R 28, the current feedback circuit that variable resistor W2 and amplifier U3A etc. form with by resistance R 17, resistance R 18, the pre-steady output voltage feedback circuit that variable resistor W1 and amplifier U3B etc. form, deliver to together 1 pin of control chip U1 by photoelectrical coupler U5, control its output duty cycle, and then change the pre-surely amplitude of output voltage, finally finish the control of (zinc lamp) load voltage and electric current.
Claims (2)
1. special high-voltage power supply of zinc element hollow cathode lamp, comprise the power circuit that is installed in the housing, it is characterized in that: be welded with the first connector (1), the second connector (2), the 3rd connector (3), status indicator lamp (4) on the described power circuit; Power circuit forms closed loop circuit by auxiliary circuit, pre-steady control circuit, pre-steady drive circuit, output control and feedback circuit, output driving and output circuit, and pre-steady control circuit is connected with pre-steady drive circuit;
The termination Alternating Current Power Supply input L end of fuse F in the described auxiliary circuit, 1 pin of another termination alternating current filter FL, 2 pin of Alternating Current Power Supply input N termination alternating current filter FL, 3 pin of alternating current filter FL and 5 pin connect respectively 1 pin and 3 pin of rectifier bridge BG, 4 pin of alternating current filter FL connect the earth, capacitor C 1 positive pole connects 2 pin of rectifier bridge BG, and the negative pole of capacitor C 1 links to each other with 4 pin of rectifier bridge BG and connects thermally;
2 pin of control chip U1 in the described pre-steady control circuit link to each other with 5 pin and connect thermally, the 1 pin difference connecting resistance R3 of control chip U1 and an end of capacitor C 7,4 pin of photoelectrical coupler U5, the other end of resistance R 3 and capacitor C 7 links to each other with 3 pin of photoelectrical coupler U5 and connects thermally, 1 pin of photoelectrical coupler U5 meets in-line power end Vcc, the end of the 6 pin connecting resistance R4 of control chip U1,7 pin of control chip U1 are the end of connecting resistance R1 respectively, the negative pole of capacitor C 5 positive poles and diode D3,8 pin of control chip U1 connect respectively the positive pole of capacitor C 4 and an end of resistance R 2, one end of another termination capacitor C 6 of resistance R 2 and 4 pin of control chip U1, the negative pole of capacitor C 4 and capacitor C 5 and the other end of capacitor C 6 link to each other and connect thermally, 2 pin of rectifier bridge BG in another termination auxiliary circuit of resistance R 1, the positive pole of diode D3 is the end of connecting resistance R5 respectively, the positive pole of the negative pole of diode D4 and capacitor C 8, the positive pole of another termination capacitor C 9 of resistance R 5 and the negative pole of diode D2, the positive pole of diode D2 connects 3 ends of ancillary coil, 4 termination capacitor C8 of ancillary coil and the negative pole of capacitor C 9, the positive pole of diode D4 reaches thermally;
After linking to each other, resistance R 6 in the described pre-steady drive circuit and an end of capacitor C 2 connect respectively 2 pin of rectifier bridge BG in 1 end of transformer TRF1 primary coil and the auxiliary circuit, after linking to each other, the other end of resistance R 6 and capacitor C 2 connects the negative pole of diode D1,2 ends of transformer TRF1 primary coil connect respectively the drain electrode of triode T1 and the positive pole of diode D1, the grid of triode T1 connects the other end of resistance R 4 in the pre-steady control circuit, the source electrode difference connecting resistance R7 of triode T1 and an end of resistance R 8, the other end of resistance R 7 connects respectively 3 pin of control chip U1 in an end of capacitor C 3 and the pre-steady control circuit, and resistance R 8 links to each other with the other end of capacitor C 3 and connects thermally;
13 pin of control chip U2 link to each other with 15 pin and meet in-line power end Vcc in described output control and the feedback circuit, 16 pin of control chip U2 connect the anodal of capacitor C 14 and as benchmark output Vr, the negative pole of capacitor C 14 connects cold ground, 1 pin of control chip U2 and 3 pin, 10 pin and 12 pin link to each other and connect cold ground, 6 pin of control chip U2 are by resistance R 21 ground connection, 7 pin of control chip U2 connect an end of capacitor C 21 and 5 pin of control chip U2 by resistance R 23,8 pin of control chip U2 connect an end of capacitor C 20, the 9 pin difference connecting resistance R22 of control chip U2 and an end of capacitor C 19, capacitor C 21, the other end of capacitor C 20 links to each other with the other end of resistance R 22 and capacitor C 19 and connects cold ground, the 1 pin difference connecting resistance R29 of amplifier U3A and an end of resistance R 30 and capacitor C 17, resistance R 29 links to each other with the other end of capacitor C 17 and connects respectively 2 pin of amplifier U3A and the end of resistance R 25 and R26, the 3 pin difference connecting resistance R27 of amplifier U3A and an end of R28 and capacitor C 18, another termination benchmark output Vr of resistance R 27, the other end of resistance R 28 connects cold ground by variable resistor W2, resistance R 26 links to each other with the other end of capacitor C 18 and connects cold ground, the base stage of another termination triode T4 of resistance R 30, the collector electrode of triode T4 connects cold ground, the emitter of triode T4 is by resistance R 31 2 pin of photoelectrical coupler U5 in the end of connecting resistance R24 and the pre-steady control circuit respectively, the positive pole of another terminating diode D6 of resistance R 24, the 7 pin difference connecting resistance R20 of amplifier U3B and an end of capacitor C 16, the negative pole of diode D6, resistance R 20 with connect 6 pin of amplifier U3B and an end of resistance R 19 after the other end of capacitor C 16 links to each other, the other end difference connecting resistance R17 of resistance R 19 and the end of R18, the pre-steady output Vout of another termination of resistance R 17,5 pin of amplifier U3B connect respectively an end of variable resistor W1 and resistance R 16, the cold ground of another termination of the other end of resistance R 16 and resistance R 18, the other end of variable resistor W1 meets benchmark output Vr by resistance R 15,1 pin of voltage stabilizing chip U4 meets pre-steady output Vout, 3 pin of U4 connect the anodal of capacitor C 15 and as in-line power end Vcc, the negative pole of capacitor C 15 connects 2 pin and the cold ground of voltage stabilizing chip U4,8 pin of amplifier U3A meet in-line power end Vcc, and 4 pin of amplifier U3A connect cold ground;
5 ends of transformer TRF1 secondary coil connect respectively the positive pole of capacitor C 10 and an end of inductance L 1 by diode D5 in described output driving and the output circuit, the other end of inductance L 1 connects respectively the positive pole of capacitor C 11, the pre-steady output end vo ut of one end of inductance L 2 and resistance R 32 and conduct, inductance L 2 other ends connect respectively the positive pole of capacitor C 12 and 2 ends of transformer TRF2 primary coil, capacitor C 10, the other end of the negative pole of capacitor C 11 and capacitor C 12 and resistance R 32 links to each other with 6 ends of transformer TRF1 secondary coil and connects cold ground, the drain electrode of triode T2 and triode T3 connects respectively 1 end and 3 ends of transformer TRF2 primary coil, the source electrode of triode T2 and triode T3 links to each other with an end of resistance R 11 and resistance R 12 and connects cold ground, the end of the grid difference connecting resistance R9 of triode T2 and the other end of resistance R 11, the end of the grid difference connecting resistance R10 of triode T3 and the other end of resistance R 12, the other end of resistance R 9 and resistance R 10 connects respectively 11 pin and 14 pin of control chip U2 in output control and the feedback circuit, 4 ends of transformer TRF2 secondary coil meet output Out1 by resistance R 13,5 ends of transformer TRF2 secondary coil connect respectively the positive pole of diode D7 and the negative pole of diode D8, the negative pole of diode D7 and diode D9 links to each other and an end of connecting resistance R14 and capacitor C 13 respectively, the other end of resistance R 25 and as output electric current measure Idet in output control and the feedback circuit, the negative pole of the positive pole of diode D9 and diode D10 links to each other and as output Out2, the other end of the positive pole of diode D8 and diode D10 and resistance R 14 and capacitor C 13 links to each other and connects cold ground.
2. special high-voltage power supply of zinc element hollow cathode lamp according to claim 1, it is characterized in that: described the first connector (1), the second connector (2) and status indicator lamp (4) are fixed on a side of housing, the second connector (2) comprises output electric current measure Idet, reference ground GND, the first connector (1) comprises the earth end E, Alternating Current Power Supply input N end, Alternating Current Power Supply input L end, the 3rd connector (3) is fixed on the opposite side of housing, comprises High voltage output OUT1, High voltage output OUT2.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910260201 CN101742793B (en) | 2009-12-25 | 2009-12-25 | Special high-voltage power supply of zinc element hollow cathode lamp |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910260201 CN101742793B (en) | 2009-12-25 | 2009-12-25 | Special high-voltage power supply of zinc element hollow cathode lamp |
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| CN101742793A CN101742793A (en) | 2010-06-16 |
| CN101742793B true CN101742793B (en) | 2013-01-02 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI572164B (en) | 2012-07-06 | 2017-02-21 | 乾坤科技股份有限公司 | Network communication device |
| CN106061084B (en) * | 2016-08-15 | 2018-04-20 | 东文高压电源（天津）股份有限公司 | A kind of high accuracy mercury lamp high-voltage module power supply special |
| CN109573079A (en) * | 2017-09-29 | 2019-04-05 | 威盛视源智能科技（天津）有限公司 | A kind of forcible entry device being equipped on unmanned plane and its control circuit |
| CN114513872B (en) * | 2021-12-30 | 2023-08-01 | 杭州春来科技有限公司 | Combined hollow cathode lamp driving circuit for heavy metal analysis |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1383261A (en) * | 2001-04-23 | 2002-12-04 | 擎宏电子企业有限公司 | Pre-stabilized power supply equipment for final-stage power amplifier |
| CN201051719Y (en) * | 2007-06-26 | 2008-04-23 | 福州大学 | Controllable digital high-voltage power supply for current conversion technology |
| CN201577228U (en) * | 2009-12-25 | 2010-09-08 | 天津市东文高压电源厂 | Special high-voltage power supply for zinc hollow cathode lamp |
-
2009
- 2009-12-25 CN CN 200910260201 patent/CN101742793B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1383261A (en) * | 2001-04-23 | 2002-12-04 | 擎宏电子企业有限公司 | Pre-stabilized power supply equipment for final-stage power amplifier |
| CN201051719Y (en) * | 2007-06-26 | 2008-04-23 | 福州大学 | Controllable digital high-voltage power supply for current conversion technology |
| CN201577228U (en) * | 2009-12-25 | 2010-09-08 | 天津市东文高压电源厂 | Special high-voltage power supply for zinc hollow cathode lamp |
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| CN101742793A (en) | 2010-06-16 |
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Owner name: TIANJIN DONGWEN HIGH-VOLTAGE POWER SUPPLY CO., LTD Free format text: FORMER OWNER: TIANJIN DONGWEN HIGH VOLTAGE POWER SUPPLY CO., LTD. Effective date: 20120723 |
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Effective date of registration: 20120723 Address after: 300171, blue mansion, No. eleven, No. 47, Hedong Road, Hedong District, Tianjin, 8F Applicant after: Tianjin Dongwen High Voltage Power Supply Plant Address before: 300171, blue mansion, No. eleven, No. 47, Hedong Road, Hedong District, Tianjin, 8F Applicant before: Tianjin Dongwen High Voltage Power Supply Factory |
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Address after: 300220, Tianjin, Hexi District, 20 Dongting Road, Chen Tong Technology Business District Service Center 415-3 Patentee after: Wen Dong high voltage power supply (Tianjin) Limited by Share Ltd Address before: 300171, blue mansion, No. eleven, No. 47, Hedong Road, Hedong District, Tianjin, 8F Patentee before: Tianjin Dongwen High Voltage Power Supply Plant |