CN203457063U - High-frequency switching power supply output rectifier circuit - Google Patents
High-frequency switching power supply output rectifier circuit Download PDFInfo
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- CN203457063U CN203457063U CN201320569895.1U CN201320569895U CN203457063U CN 203457063 U CN203457063 U CN 203457063U CN 201320569895 U CN201320569895 U CN 201320569895U CN 203457063 U CN203457063 U CN 203457063U
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model provides a high-frequency switching power supply output rectifier circuit comprising an AC power failure detection circuit, a primary control circuit, a secondary control circuit, an isolation transmission circuit and a synchronous rectification power supply switch circuit, wherein the AC power failure detection circuit is used for detecting a disconnected signal of AC power input from an AC side, the primary control circuit is used for generating a control signal according to the AC power disconnected signal, the control signal is sent to the secondary control circuit via the isolation transmission circuit, and the secondary control circuit is used for receiving the control signal, outputting a high level, and controlling the synchronous rectification power supply switch circuit to control a synchronous rectification MOS transistor to cut off. According to the output synchronous rectification control technology, the technical problems that the synchronous rectification MOS transistor is broken down and damaged due to power-on and power-off of commercial power, output switching between no-load and full-load, voltage adjusting switching of output wide voltage and output short circuit in an LLC resonance topology switching power supply output small load state.
Description
Technical field
The utility model relates to output synchronous rectification control technology field, and particularly LLC resonance topological high frequency switch power output circuit of synchronous rectification, is a kind of circuit of the LLC of being arranged on resonance topological high frequency switch power output rectification.
Background technology
Traditional LLC(logical circuit control) resonance topological output rectification is a kind of high frequency switch power that utilizes diode rectification to reach output dc voltage, mainly has advantages of that output rectifier diode voltage stress is low.Its shortcoming is that the loss of output rectifier diode is large, the corresponding step-down of power-efficient.In the ever-increasing situation of output loading, also just larger with the loss of the higher output rectifier diode of load current rising, the temperature rise of power module is also just higher, and electric power resource availability declines.If power module long-term work at the state of high loss, causes at least following harmful effect: thereby 1, the lost of life of device affects machine life; 2, power module needs better radiating condition, causes cost to increase; 3, waste electric power resource.And there is defect in existing LLC resonance topological output synchronous rectification application, be embodied in that power supply exports that civil power under little load condition powers on, lower electricity, output no-load and fully loadedly switch, export wide voltage pressure regulation and switch, the very high punch through damage rectification metal-oxide-semiconductor that can cause devices voltage stress to become suddenly.
Summary of the invention
The present invention will solve: existing LLC resonance topological output synchronous rectification is applied in and in practical application scene, has the too high and technical problem of punch through damage rectification metal-oxide-semiconductor of voltage stress.
In order to solve above technical problem, the technical scheme that the present invention takes is: a kind of high frequency switch power output rectification circuit, be arranged on high frequency switch power LLC resonance topological output circuit of synchronous rectification, comprise AC dump testing circuit, former limit control circuit, secondary control circuit, isolation and transmission circuit and synchronous rectification switching circuit of power supply; Described AC dump testing circuit detects the signal of the alternating current disconnection of being inputted by AC; The signal that described former limit control circuit disconnects according to described alternating current produces control signal, described control signal is sent to described secondary control circuit through isolation and transmission circuit, described secondary control circuit receives control signal output high level, controls described synchronous rectification switching circuit of power supply and controls devices cut-off.
Further, in above-mentioned high frequency switch power output rectification circuit: described synchronous rectification switching circuit of power supply comprises diode D5, voltage-stabiliser tube ZD7, triode Q12, triode Q13, resistance R 241, resistance R 242, resistance R 243;
Described secondary control circuit receives the high electricity of control signal output and by resistance R 242, is linked into the base stage of triode Q13, the collector electrode of described triode Q13 connects power supply by resistance R 241, the grounded emitter of described triode Q13, voltage-stabiliser tube ZD7 is arranged between the collector electrode and emitter of described triode Q13, and the anode of voltage-stabiliser tube ZD7 connects the emitter of triode Q13;
The base stage of described triode Q12 connects the described collector electrode of triode Q13, the current collection collection of triode Q12 connects the grid that power supply, emitter connect described devices.
Further, in above-mentioned high frequency switch power output rectification circuit: described AC dump testing circuit comprises diode D1, diode D2, resistance R 9, resistance R 10, resistance R 11, capacitor C 5, capacitor C 18, resistance R 42, voltage-stabiliser tube ZD4;
Described diode D1 and the anode of diode D2 connect respectively the two poles of the earth of alternating current, and described diode D1 is connected with the negative electrode of diode D2;
Described resistance R 9, resistance R 10, resistance R 11 and resistance R 42 series windings form bleeder circuit;
Described diode D1 and the negative electrode of diode D2 are by described bleeder circuit ground connection;
Voltage-stabiliser tube ZD4 is in parallel with capacitor C 18, the plus earth of voltage-stabiliser tube ZD4;
Further, in above-mentioned high frequency switch power output rectification circuit: described isolation and transmission circuit comprises high speed photo coupling U17, that from the input pin of described high speed photo coupling U17, input is the control signal TX being produced by former limit control circuit, and output pin output signal RX connects secondary control circuit; Described output signal RX connects DC power supply through pull-up resistor R74.
Further, in above-mentioned high frequency switch power output rectification circuit: also comprise the mode of operation pin of the pulse width controller that is arranged on described logical circuit control resonant circuit and the isolation detection circuit between secondary control circuit, described isolation detection circuit comprises optocoupler U28, current-limiting resistance R145 and current-limiting resistance R186; DC power supply connects the anode of the light-emitting diode of described optocoupler U28 by current-limiting resistance R145, the negative electrode of light-emitting diode connects the mode of operation pin that described logical circuit is controlled the pulse width controller of resonant circuit; The anode of the photosensitive switch of the output of described optocoupler U28 connects power supply by current-limiting resistance R186, the minus earth of photosensitive switch, and the anode of photosensitive switch is output detection signal.
Output synchronous rectification control technology of the present utility model, owing to having used detection, isolation signal transmission, programming Control, electronic switching circuit technical scheme, thus solved that LLC resonance topological Switching Power Supply exports that civil power under little load condition powers on, lower electricity, output no-load and fully loadedly switch, export wide voltage pressure regulation switching, output short-circuit and cause the technical problem of devices punch through damage.
Below with reference to drawings and Examples, the utility model is described in detail.
Accompanying drawing explanation
Fig. 1 is the utility model output synchronous rectification control technology structured flowchart.
Fig. 2 is AC dump testing circuit and the former limit connecting circuit schematic diagram of the utility model embodiment.
Fig. 3 is the synchronous rectification switching circuit of power supply schematic diagram of the utility model embodiment.
Fig. 4 is the isolation and transmission circuit schematic diagram of the utility model embodiment.
Fig. 5 is the secondary control circuit schematic diagram of the utility model embodiment.
Fig. 6 is the isolation detection circuit schematic diagram of the present embodiment.
Embodiment
As shown in Figure 1: the present embodiment is a kind of output synchronous rectification control technology scheme, be arranged on high frequency switch power LLC resonance topological output circuit of synchronous rectification, as shown in Figure 1: comprise AC dump testing circuit, isolation and transmission circuit, isolation detection circuit, former limit control circuit, secondary control circuit, synchronous rectification switching circuit of power supply.
As shown in Figure 2, AC dump testing circuit comprises diode D1, diode D2, resistance R 9, resistance R 10, resistance R 11, capacitor C 5, capacitor C 18, resistance R 42, voltage-stabiliser tube ZD4; The anode of diode D1 and diode D2 connects respectively the two poles of the earth of alternating current, and diode D1 is connected with the negative electrode of diode D2; Resistance R 9, resistance R 10, resistance R 11 and resistance R 42 series windings form bleeder circuit; The negative electrode of diode D1 and diode D2 is by bleeder circuit ground connection; Capacitor C 5 and capacitor C 18 series windings, the other end of capacitor C 5 is connected with the tie point of resistance R 42 with resistance R 11, the other end ground connection of capacitor C 18; Voltage-stabiliser tube ZD4 is in parallel with capacitor C 18, the plus earth of voltage-stabiliser tube ZD4; Capacitor C 5 is AC dump signal output part with the tie point of capacitor C 18.
In the present embodiment, 17 pin that AC dump testing circuit is delivered to the processor chips U4 chip in the control circuit of former limit by the power-off signal detecting make a decision, and in the present embodiment, the model of these processor chips is PIC16F690.Due to the effect of U4 programming, 17 pin of U4 chip detect civil power power down, and its 10 pin can transfer to the 1 pin detection of secondary control circuit U14 by output communication signal through isolation and transmission circuit isolation, as shown in Figure 5.Due to the effect of U14 chip programming order, when its 1 pin receives power down signal of communication, 23 pin of U14 can be exported high level and turn-off synchronous rectification switching circuit of power supply, thereby control the cut-off of devices, have avoided the too high and problem damaged of civil power power down output synchronous rectification voltage stress.
As shown in Figure 4, isolation and transmission circuit comprises high speed photo coupling U17, and that from the input pin of described high speed photo coupling U17, input is the control signal TX being produced by former limit control circuit, and output pin output signal RX connects secondary control circuit; Described output signal RX connects DC power supply through pull-up resistor R74.
In the present embodiment; the model of high speed photo coupling U17 is 6N136; high speed photo coupling 6N136 is the photoelectric coupled device with good characteristic that Toshiba Corp produces; height infraluminescence pipe of encapsulation and phototriode in this model; have that volume is little, life-span length, strong interference immunity, isolation voltage are high, high-speed, with the feature such as TTL logic level compatibility, can be used for isolating the aspects such as circuit, switching circuit, digital-to-analogue conversion, logical circuit, long line transmission, overcurrent protection, high voltage control, level match, linearity amplification.
That synchronous rectification switching circuit of power supply in the present embodiment comprises diode D5, voltage-stabiliser tube ZD7, triode Q12, triode Q13, resistance R 241, resistance R 242, resistance R 243 as shown in Figure 3; Secondary control circuit receives the high electricity of control signal output and by resistance R 242, is linked into the base stage of triode Q13, the collector electrode of triode Q13 connects power supply by resistance R 241, the grounded emitter of triode Q13, voltage-stabiliser tube ZD7 is arranged between the collector electrode and emitter of described triode Q13, and the anode of voltage-stabiliser tube ZD7 connects the emitter of triode Q13; The base stage of triode Q12 connects the collector electrode of triode Q13, the current collection collection of triode Q12 connects the grid that power supply, emitter connect devices.
As shown in Figure 6, isolation detection circuit comprises optocoupler U28, current-limiting resistance R145 and current-limiting resistance R186; DC power supply connects the anode of the light-emitting diode of described optocoupler U28 by current-limiting resistance R145, the negative electrode of light-emitting diode connects the mode of operation pin that described logical circuit is controlled the pulse width controller of resonant circuit; The anode of the photosensitive switch of the output of described optocoupler U28 connects power supply by current-limiting resistance R186, the minus earth of photosensitive switch, and the anode of photosensitive switch is output detection signal.
In the present embodiment, isolation detection circuit comprises between 9 pin and secondary CPU testing circuit that are arranged on LLC resonant circuit pwm chip L6599, light-coupled isolation testing circuit is that the low and high level of (minute intermittent mode low level and continuous mode high level) under the 9 pin different working modes for detection of LLC resonant circuit pwm chip L6599 makes optocoupler cut-off or conducting, intermittent mode is due to the 9 pin low levels of L6599, at this moment optocoupler U28 conducting, on its 4 pin, level is dragged down, the corresponding step-down of 14 pin level of secondary CPU testing circuit U14 chip now, effect due to secondary CPU programming, the 14 pin input low levels when U14 chip, 23 pin of U14 chip will be exported high level, through R242 resistance, described synchronous rectification switching circuit of power supply is turn-offed again, thereby control the cut-off of devices, avoided LLC resonant circuit to be operated in exporting under intermittent mode the too high and problem damaged of synchronous rectification voltage stress.
Its course of work is summarized as follows:
When civil power powers on, secondary control circuit chip is due to the effect of programming, first first synchronous rectification switching circuit of power supply is turn-offed, control thus the cut-off of devices, to guarantee that LLC resonant circuit is operated in when powering on, under uncertain pattern, export the too high and problem damaged of synchronous rectification voltage stress, after after powering on, LLC resonant circuit works, whether the level that secondary control circuit reports according to light-coupled isolation testing circuit again opens output devices, if light-coupled isolation testing circuit detects 9 pin of LLC resonant circuit pwm chip L6599 and is operated under intermittent mode, light-coupled isolation testing circuit reports low level to be given to secondary CPU detection and control circuit detects, effect due to secondary CPU programming, when detecting pin, secondary CPU low level detected, its output pin can be exported high level synchronous rectification switching circuit of power supply is turn-offed, thereby control the cut-off of devices, if isolation detection circuit detects 9 pin of LLC resonant circuit pwm chip L6599 and is operated under continuous mode, isolation detection circuit reports high level to be given to secondary control circuit and detects, effect due to the CPU programming of secondary control circuit, CPU in secondary control circuit detects pin and high level detected, its output pin can output low level be opened synchronous rectification switching circuit of power supply, thereby it is open-minded to control devices again, while having avoided civil power to power on, LLC resonant power is operated under uncertain pattern, output devices is the technical problem of the too high damage of voltage stress because work.
When electric under civil power, AC dump testing circuit can send power-off signal to fast former limit control circuit and detect, effect due to the CPU programming in the control circuit of former limit, when detecting pin, cpu chip power-off signal detected, its chip output pin can report the detection of secondary control circuit through high speed photo coupling isolation and transmission circuit by output communication signal, cpu chip output pin through judgement in secondary control circuit turn-offs synchronous rectification switching circuit of power supply (being 10 persons of outstanding talent second to turn-offing this time course of synchronous rectification switching circuit of power supply from sending power-off signal) fast, thereby control devices cut-off work, devices while having avoided under civil power electricity is because work and the technical problem of the too high damage of voltage stress.
When pressure regulation switching is exported to LLC resonant power in backstage, CPU in secondary control circuit is due to the effect of programming, cpu chip when receiving pressure regulation instruction first output signal first synchronous rectification switching circuit of power supply is turn-offed, thereby control devices cut-off work, and then change benchmark is exported pressure regulation, according to the mode of operation of LLC resonant circuit after pressure regulation, judge whether to control devices more afterwards open-minded, as being operated in continuous mode, to control devices open-minded, while having avoided LLC resonant power to export pressure regulation switching, power work is under uncertain pattern, output devices is the technical problem of the too high damage of voltage stress because work.
In sum, this LLC resonance topological output synchronous rectification control technology circuit, safe design and Programming have been adopted, improved the reliability of LLC resonant power output devices, having solved civil power under the little load condition of output powers on, lower electricity, output no-load switches with fully loaded, export wide voltage pressure regulation and switch the technical problem that causes devices punch through damage, because this LLC resonance topological output synchronous rectification control technology circuit has adopted CPU Programming, peripheral components is few, control very intelligent, and the unnecessary pin of former limit and secondary cpu chip can be used as the electrifying timing sequence control of power supply, input mains supply over-voltage and under-voltage protection, overheat protector, can realize input voltage and report backstage, input power reports backstage, power supply temperature reports backstage, can also detect and output over-voltage protection as output voltage, with functions such as background communications, practicality and the reliability of LLC resonance topological output synchronous rectification control technology circuit have been embodied, also development trend and the cutting edge technology of current LLC resonance topological output synchronous rectification control technology have been represented.
Claims (5)
1. a high frequency switch power output rectification circuit, be arranged on high frequency switch power logical circuit and control on resonance topological output circuit of synchronous rectification, it is characterized in that: comprise AC dump testing circuit, former limit control circuit, secondary control circuit, isolation and transmission circuit and synchronous rectification switching circuit of power supply; Described AC dump testing circuit detects the signal of the alternating current disconnection of being inputted by AC; The signal that described former limit control circuit disconnects according to described alternating current produces control signal, described control signal is sent to described secondary control circuit through isolation and transmission circuit, described secondary control circuit receives control signal output high level, controls described synchronous rectification switching circuit of power supply and controls devices cut-off.
2. high frequency switch power output rectification circuit according to claim 1, is characterized in that: described synchronous rectification switching circuit of power supply comprises diode D5, voltage-stabiliser tube ZD7, triode Q12, triode Q13, resistance R 241, resistance R 242, resistance R 243;
Described secondary control circuit receives the high electricity of control signal output and by resistance R 242, is linked into the base stage of triode Q13, the collector electrode of described triode Q13 connects power supply by resistance R 241, the grounded emitter of described triode Q13, voltage-stabiliser tube ZD7 is arranged between the collector electrode and emitter of described triode Q13, and the anode of voltage-stabiliser tube ZD7 connects the emitter of triode Q13;
The base stage of described triode Q12 connects the described collector electrode of triode Q13, the current collection collection of triode Q12 connects the grid that power supply, emitter connect described devices.
3. high frequency switch power output rectification circuit according to claim 1, is characterized in that: described AC dump testing circuit comprises diode D1, diode D2, resistance R 9, resistance R 10, resistance R 11, capacitor C 5, capacitor C 18, resistance R 42, voltage-stabiliser tube ZD4;
Described diode D1 and the anode of diode D2 connect respectively the two poles of the earth of alternating current, and described diode D1 is connected with the negative electrode of diode D2;
Described resistance R 9, resistance R 10, resistance R 11 and resistance R 42 series windings form bleeder circuit;
Described diode D1 and the negative electrode of diode D2 are by described bleeder circuit ground connection;
Capacitor C 5 and capacitor C 18 series windings, the other end of capacitor C 5 is connected with the tie point of resistance R 42 with resistance R 11, the other end ground connection of capacitor C 18;
Voltage-stabiliser tube ZD4 is in parallel with capacitor C 18, the plus earth of voltage-stabiliser tube ZD4;
Capacitor C 5 is AC dump signal output part with the tie point of capacitor C 18.
4. high frequency switch power output rectification circuit according to claim 1, it is characterized in that: described isolation and transmission circuit comprises high speed photo coupling U17, that from the input pin of described high speed photo coupling U17, input is the control signal TX being produced by former limit control circuit, and output pin output signal RX connects secondary control circuit; Described output signal RX connects DC power supply through pull-up resistor R74.
5. according to arbitrary described high frequency switch power output rectification circuit in claim 1 to 4, it is characterized in that: also comprise the mode of operation pin of the pulse width controller that is arranged on described logical circuit control resonant circuit and the isolation detection circuit between secondary control circuit, described isolation detection circuit comprises optocoupler U28, current-limiting resistance R145 and current-limiting resistance R186; DC power supply connects the anode of the light-emitting diode of described optocoupler U28 by current-limiting resistance R145, the negative electrode of light-emitting diode connects the mode of operation pin that described logical circuit is controlled the pulse width controller of resonant circuit; The anode of the photosensitive switch of the output of described optocoupler U28 connects power supply by current-limiting resistance R186, the minus earth of photosensitive switch, and the anode of photosensitive switch is output detection signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320569895.1U CN203457063U (en) | 2013-09-13 | 2013-09-13 | High-frequency switching power supply output rectifier circuit |
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| CN201320569895.1U CN203457063U (en) | 2013-09-13 | 2013-09-13 | High-frequency switching power supply output rectifier circuit |
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| CN203457063U true CN203457063U (en) | 2014-02-26 |
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| CN201320569895.1U Expired - Lifetime CN203457063U (en) | 2013-09-13 | 2013-09-13 | High-frequency switching power supply output rectifier circuit |
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| CN107949095A (en) * | 2017-10-31 | 2018-04-20 | 浙江凯耀照明股份有限公司 | LED light High voltage output control device and control method |
| CN109560706A (en) * | 2017-09-27 | 2019-04-02 | 昱京能源科技股份有限公司 | PSR current control system under LLC framework |
| CN110289660A (en) * | 2019-07-23 | 2019-09-27 | 武汉洲际电讯科技股份有限公司 | Electric control circuit under a kind of communication power supply |
| CN110995007A (en) * | 2019-11-29 | 2020-04-10 | 北京航天长征飞行器研究所 | Isolated high-low voltage conversion self-holding circuit |
| WO2020151221A1 (en) * | 2019-01-24 | 2020-07-30 | 青岛海信电器股份有限公司 | Synchronous rectification circuit and display device |
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| WO2022002000A1 (en) * | 2020-06-30 | 2022-01-06 | 比亚迪半导体股份有限公司 | Undervoltage protection circuit and device |
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- 2013-09-13 CN CN201320569895.1U patent/CN203457063U/en not_active Expired - Lifetime
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| CN109560706A (en) * | 2017-09-27 | 2019-04-02 | 昱京能源科技股份有限公司 | PSR current control system under LLC framework |
| CN109560706B (en) * | 2017-09-27 | 2020-08-25 | 昱京能源科技股份有限公司 | PSR current control system under LLC framework |
| CN107949095A (en) * | 2017-10-31 | 2018-04-20 | 浙江凯耀照明股份有限公司 | LED light High voltage output control device and control method |
| WO2020151221A1 (en) * | 2019-01-24 | 2020-07-30 | 青岛海信电器股份有限公司 | Synchronous rectification circuit and display device |
| CN111478566A (en) * | 2019-01-24 | 2020-07-31 | 海信视像科技股份有限公司 | Synchronous rectification circuit and display device |
| US11075585B2 (en) | 2019-01-24 | 2021-07-27 | Hisense Visual Technology Co., Ltd. | Synchronous rectification circuit and display device |
| CN110289660A (en) * | 2019-07-23 | 2019-09-27 | 武汉洲际电讯科技股份有限公司 | Electric control circuit under a kind of communication power supply |
| CN110289660B (en) * | 2019-07-23 | 2024-04-26 | 武汉洲际电讯科技股份有限公司 | Power-down control circuit of communication power supply |
| CN110995007A (en) * | 2019-11-29 | 2020-04-10 | 北京航天长征飞行器研究所 | Isolated high-low voltage conversion self-holding circuit |
| WO2022002000A1 (en) * | 2020-06-30 | 2022-01-06 | 比亚迪半导体股份有限公司 | Undervoltage protection circuit and device |
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Address after: 518000 Floors 1-3 and 1-5 of Block A, Block B2, Jinweiyuan Industrial Plant, Longshan District, Pingshan New District, Shenzhen City, Guangdong Province Patentee after: SHENZHEN GOLD POWER TECHNOLOGY Co.,Ltd. Address before: 518000 First, Second and Fifth Floors of B2 Workshop of Fengyeyuan Industrial Plant, Liuxian Second Road, Baocheng 68 District, Baoan District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN GOLD POWER TECHNOLOGY Co.,Ltd. |
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Granted publication date: 20140226 |
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