CN102147651B - Uninterruptible power supply (UPS) - Google Patents
Uninterruptible power supply (UPS) Download PDFInfo
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- CN102147651B CN102147651B CN2010101103365A CN201010110336A CN102147651B CN 102147651 B CN102147651 B CN 102147651B CN 2010101103365 A CN2010101103365 A CN 2010101103365A CN 201010110336 A CN201010110336 A CN 201010110336A CN 102147651 B CN102147651 B CN 102147651B
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Abstract
The invention relates to an uninterruptible power supply (UPS). The UPS comprises a first rectifier which rectifies a mains alternating current. The UPS is characterized by further comprising a mains detector, a first oscillator, a second oscillator, an alternating current/direct current converter, a closed loop feedback device and a control and pulse width modulator, wherein the mains detector receives the mains alternating current and carries out voltage detection on the mains alternating current; the first oscillator and the second oscillator receive direct current signals output by the first rectifier and convert the direct current signals into alternating current signals; the alternating current/direct current converter receives the alternating current signals output by the first and second oscillators respectively and converts the alternating current signals into the direct current signals; the closed loop feedback device receives the direct current signal output by the alternating current/direct current converter; and the control and pulse width modulator receives the signals output by the mains detector and the closed loop feedback device respectively and controls the operation of the first and second oscillators respectively. The UPS has the advantages of high conversion efficiency, good reliability, low manufacturing cost, simple operation and no increase of any installation space; the UPS is placed in a computer case, so that an occupation space is small; the conversion process of electric energy is reduced, the service time of a battery is prolonged, and over 30 percent of the working time of a computer can be prolonged due to the same capacity of the battery, so that the aims of energy saving and environmental friendliness are fulfilled; and circuit design is reduced, the usage quantity of components is reduced, and the running reliability of the whole computer is improved.
Description
Technical field
The present invention relates to a kind of uninterrupted power source that is built in the energy-conserving and environment-protective in computer housing.
Background technology
Uninterrupted power source (Uninterruptible Power Supply) is called for short UPS.Be a kind of device that is serially connected with between civil power and consumer, include the energy storage device accumulator.When civil power was normal, UPS utilized the civil power electric energy, give consumer (load) power supply on one side, charge a battery on one side.When city's electrical anomaly or power failure, UPS is transformed into satisfactory alternating current powering load to the rectification electric energy of battery.
Present uninterrupted power source (UPS) all comprises a cover fairing, a cover charging and energy storage device, and a cover inverter is integrated into one independently in cabinet, or energy storage battery is external.Shortcoming be electric energy through twice conversion after, utilize benefit low, be unfavorable for energy-conserving and environment-protective; Change-over circuit is complicated, and reliability is low; Volume and weight are large, and manufacturing cost is high.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art and provide a kind of UPS conversion efficiency high, good reliability, low cost of manufacture takies independent little, simple to operate a kind of uninterrupted power source.
in order to achieve the above object, the present invention realizes like this, it is a kind of uninterrupted power source, comprise the first rectifier that city's alternating current is carried out rectification, one receives city's alternating current and it is carried out city's photodetector of voltage detecting, the direct current signal that one reception the first rectifier is exported and the first oscillator that converts thereof into AC signal, the second oscillator, one receives respectively first, the AC signal of two oscillator outputs also will be converted to the ac-dc conversion device of direct current signal again with it, one receives the close-loop feedback device of ac-dc conversion device output direct current signal, one receives respectively the signal of city's photodetector and the output of close-loop feedback device and controls respectively first, the control of two oscillator work and pulse width modulator, one receives the AC signal of the first oscillator or the output of the second oscillator and is converted into the second rectifier that the DC charging signal charges to internal battery, it is characterized in that: described control and pulse width modulator comprise to be controlled and PWM generator, and described control and PWM generator are with the relay R Y1 of two normally closed contacts, described the first oscillator comprises two groups of primary coils, the first field effect transistor and second field effect transistor of the first resistance to the four resistance, the 3rd electric capacity to the six electric capacity, the second electrochemical capacitor, the 5th diode, the 8th diode, transformer, the grid of the first field effect transistor connects a pin of control and PWM generator, and its grounded drain, its source electrode connect respectively the anode of the 5th diode and an end of the second resistance, the negative electrode of the 5th diode is by the second electrochemical capacitor ground connection, one end of another termination the 4th electric capacity of the second resistance, the other end of the 4th electric capacity is succeeded respectively an end of electrical equipment normally closed contact and an end of the 3rd electric capacity, the output terminal of another termination the first rectifier of this normally closed contact, two of one group of primary coil terminates at the two ends of the series circuit of the second resistance and the 4th electric capacity formation, one end of another termination the first resistance of the 3rd electric capacity, the other end of the first resistance is by the second electrochemical capacitor ground connection, the grid of the second field effect transistor connects another pin of control and PWM generator, and its grounded drain, its source electrode connect respectively the anode of the 8th diode and an end of the 4th resistance, the negative electrode of the 8th diode is by the second electrochemical capacitor ground connection, one end of another termination the 5th electric capacity of the 4th resistance, the other end of another termination the 4th electric capacity of the 5th electric capacity, two of another group primary coil terminates at the two ends of the series circuit of the 4th resistance and the 5th electric capacity formation, one end of another termination the 3rd resistance of the 6th electric capacity, the other end of the 3rd resistance is by the second electrochemical capacitor ground connection, the negative electrode of one termination the 5th diode of another normally closed contact of relay, the input end of another termination the first rectifier, described the second oscillator comprises third and fourth field effect transistor, one group of primary coil of transformer and the 9th electrochemical capacitor, the grid of third and fourth field effect transistor connects respectively to be controlled and the two ends of PWM generator, the equal ground connection of their drain electrode, and this connects respectively the two ends of this primary coil their source electrode two ends, described ac-dc conversion device comprises that four groups of secondary coils, the 6th diode, the 7th diode, the 9th diode, the tenth diode, the 11 diode, the 12 diode, the 15 diode, the 16 diode, the 4th inductance to the six inductance, the 3rd electrochemical capacitor of transformer are to electrochemical capacitor eight, the tenth electrochemical capacitor and 11 electrochemical capacitors, one termination transformer of the 9th above-mentioned electrochemical capacitor is one group of elementary center tap and connect the output terminal of the first rectifier, other end ground connection wherein, the anode of the 6th diode, seven diodes connects respectively the two ends of one group of secondary coil, the 3rd inductance and third and fourth electrochemical capacitor form the ∏ mode filter, the input termination the 6th of this ∏ mode filter, the negative electrode of seven diodes, it is output as required dc output end and is the signal input part of close-loop feedback device, nine, the anode of ten diodes connects respectively the two ends of another group secondary coil, and the 4th inductance and the 5th, six electrochemical capacitors form the ∏ mode filter, the input termination the 5th of this filter ∏ shape ripple device, the negative electrode of six diodes, and it is output as needed direct current output, the anode of the 11,12 diodes connects respectively the two ends of another group of secondary coil, the 5th inductance and the 7th, eight electrochemical capacitors form the ∏ mode filter, the negative electrode of input termination the 11,12 diodes of this ∏ mode filter, it is output as needed direct current output, the anode of the 15,16 diodes connects respectively the two ends of one group of secondary coil again, the 6th inductance and the tenth, 11 electrochemical capacitors form the ∏ mode filter, the negative electrode of input termination the 15,16 diodes of this ∏ mode filter, it is output as needed direct current output.
The present invention's advantage compared with prior art is, the UPS conversion efficiency is high, good reliability, and low cost of manufacture, simple to operate, do not increase any installing space, take up room little, UPS is placed in computer housing.Reduce the transformation of electrical energy process, extend service time of battery, equal battery capacity can extend the computer work time more than 30%, reaches the purpose of energy-conserving and environment-protective.Reduce circuit design, reduce the components and parts usage quantity, improve the complete machine operational reliability, extend the complete machine failure free time.
Description of drawings
Fig. 1 is circuit block diagram of the present invention;
Fig. 2 is the circuit theory diagrams of Fig. 1.
Embodiment
Below in conjunction with drawings and Examples, the present invention is done further detailed description:
as shown in Figure 1, a kind of energy-conserving and environment-protective uninterrupted power source, comprise the first rectifier 1 that city's alternating current is carried out rectification, one receives city's alternating current and it is carried out city's photodetector 4 of voltage detecting, the direct current signal that one reception the first rectifier 1 is exported and the first oscillator 2 that converts thereof into AC signal, the second oscillator 6, one receives respectively first, the AC signal of two oscillator outputs also will be converted to the ac-dc conversion device 3 of direct current signal again with it, one receives the close-loop feedback device 7 of ac-dc conversion device output direct current signal, one receives respectively the signal of city's photodetector and the output of close-loop feedback device and controls respectively first, the control of two oscillator work and pulse width modulator 5.During work, as more stable in city's alternating voltage, the first rectifier 1 and the first oscillator 2 work, ac-dc conversion device 3 alternating current of the first oscillator output is converted to direct voltage output and with this signal feedback to controlling and pulse width modulator 5, by controlling and pulse width modulator is adjusted the output pulse amplitude of the first rectifier; As unstable in city's alternating voltage, city's photodetector 4 detects the spread of voltage signal and it is outputed to and controls and pulse width modulator, control and pulse width modulator quit work the first oscillator 2, and the second oscillator 6 is worked, ac-dc conversion device 3 alternating current of the second oscillator output is converted to direct voltage output and with this signal feedback to controlling and pulse width modulator, by controlling and pulse width modulator is adjusted the output pulse amplitude of the second oscillator.
In the present embodiment, also comprise the AC signal that receives the first oscillator 2 or the second oscillator 6 outputs and be converted into the second rectifier 8 that the DC charging signal charges to internal battery.The second rectifier comprises the 15 diode D15, the 16 diode D16, the 4th resistance R 4, the 12 electrochemical capacitor E12 and one group of primary coil; The anode of the 15 diode D15, the 16 diode D16 connects respectively the two ends of this group primary coil, their negative electrode is connected and connects respectively an end of the 4th resistance R 4 and an end of the 12 electrochemical capacitor, the positive pole of the internal battery of the charging such as another termination of the 4th resistance, the other end ground connection of the 12 electrochemical capacitor, the minus earth of internal battery.
Control and pulse width modulator 5 comprise to be controlled and PWM generator, and described control and PWM generator are with the relay R Y1 of two normally closed contacts; Described the first oscillator 2 comprises two groups of primary coils, the first field effect transistor G1 and the second field effect transistor G2 of the first resistance R 1 to the 4th resistance R 4, the 3rd capacitor C 3 to the 6th capacitor C 6, the second electrochemical capacitor E2, the 5th diode D5, the 8th diode D8, transformer B; The G1 grid of the first field effect transistor connects a pin of control and PWM generator, and its grounded drain, its source electrode connect respectively the anode of the 5th diode D5 and an end of the second resistance R 2; The negative electrode of the 5th diode is by the second electrochemical capacitor ground connection; One end of another termination the 4th capacitor C 4 of the second resistance, the other end of the 4th electric capacity is succeeded respectively the end of electrical equipment normally closed contact RY1-2 and an end of the 3rd capacitor C 3, the output terminal of another termination the first rectifier 1 of this normally closed contact, two of primary coil terminates at the two ends of the series circuit of the second resistance R 2 and the 4th capacitor C 4 formations, one end of another termination the first resistance R 1 of the 3rd electric capacity, the other end of the first resistance is by the second electrochemical capacitor E2 ground connection; The grid of the second field effect transistor G2 connects another pin of control and PWM generator, and its grounded drain, its source electrode connect respectively the anode of the 8th diode D8 and an end of the 4th resistance R 4; The negative electrode of the 8th diode is by the second electrochemical capacitor E2 ground connection; One end of another termination the 5th capacitor C 5 of the 4th resistance, the other end of another termination the 4th electric capacity of the 5th electric capacity, two of another primary coil terminates at the two ends of the series circuit of the 4th resistance R 4 and the 5th capacitor C 5 formations, one end of another termination the 3rd resistance of the 6th capacitor C 6, the other end of the 3rd resistance R 3 is by the second electrochemical capacitor E2 ground connection; The negative electrode of termination the 5th diode D5 of another normally closed contact RY1-1 of relay, the input end of another termination the first rectifier 1.
The first rectifier 1 comprises first and second inductance L 1, L2, first and second capacitor C 1, C2, and the first electrochemical capacitor E1 reaches by first to fourth diode D1-D4; First and second inductance and first and second capacitor C 1, C2 consist of the ∏ mode filter, and first to fourth diode forms bridge rectifier, and the output terminal of rectifier is by the first electrochemical capacitor ground connection.
The second oscillator 6 comprises the 3rd field effect transistor G3, the 4th field effect transistor G4, one group of primary coil of transformer B and the 9th electrochemical capacitor E9, the grid of third and fourth field effect transistor connects respectively the two ends of control and PWM generator, the equal ground connection of their drain electrode, their source class connects the two ends of this group primary coil.
Ac-dc conversion device 3 comprises transformer B, the 6th diode D6, the 7th diode D7, the 9th diode D9, the tenth diode D10, the 11 diode D11, the 12 diode D12, the 15 diode D15, the 16 diode D16, the 4th inductance L 4 to the 6th inductance L 6 and the 3rd electrochemical capacitor E3 to the eight electrochemical capacitor E8, the tenth electrochemical capacitor E10 and the 11 electrochemical capacitor E11; Transformer has four groups of primary coils and four groups of secondary coils, and the termination transformer of the 9th above-mentioned electrochemical capacitor E9 is one group of elementary center tap and connect the output terminal of the first rectifier, other end ground connection wherein; Six, the anode of seven diode D6, D7 connects respectively the two ends of one group of secondary coil, the center tap ground connection of this secondary coil, the 3rd inductance L 3 and third and fourth electrochemical capacitor E3, E4 form the ∏ mode filter, the input termination the 6th of this ∏ mode filter, the negative electrode of seven diodes, it is output as required dc output end and is the signal input part of close-loop feedback device; Nine, the anode of ten diode D9, D10 connects respectively the two ends of another group secondary coil, the center tap ground connection of this secondary coil, the 4th inductance and the 5th, six electrochemical capacitors form the ∏ mode filter, the input termination the 5th of this ∏ mode filter, the negative electrode of six diodes, it is output as required dc output end; The anode of the 11,12 diode D11, D12 connects respectively the two ends of another group of secondary coil, the center tap ground connection of this secondary coil, the 5th inductance and the 7th, eight electrochemical capacitors form the ∏ mode filter, the negative electrode of input termination the 11,12 diodes of this ∏ mode filter, it is output as required dc output end; The anode of the 15,16 diode D15, D16 connects respectively the two ends of one group of secondary coil again, the center tap ground connection of this secondary coil, the 6th inductance and the tenth, 11 electrochemical capacitors form the ∏ mode filter, the negative electrode of input termination the 15,16 diodes of this ∏ mode filter, it is output as required dc output end.
The course of work of the present invention is:
1, normally (scope range of the fluctuation of voltage is+25% to civil power,-40%) time, civil power is through first and second inductance L 1, L2, first and second capacitor C 1, after C2 filtering, for rectifier D1-D4 and display provide energy, load can be filtered the higher hamonic wave of rectifier institute production capacity simultaneously, reduces the pollution to electrical network.direct current after rectification, the normally closed point of RY1 two through relay, conduction sends a telegram to first, two magnetron G1, G2, the 5th, eight diode D5, D8, first to fourth resistance R 1-R4, the the 3rd to the 6th capacitor C 3, the first oscillator that the primary coil of C6 and two groups of transformer B forms, controlled by governor circuit, form required alternating current, this alternating current is coupled to four groups of secondary coils through transformer B, via the 6th, the bridge rectifier rectification that the 9th D6-13 forms, again through providing the computer normal operation required DC voltage after the filter filtering that is formed by inductance L 3-L6 and electrochemical capacitor E3-E11, simultaneously through close-loop feedback device 7, feed back to and control and pulse width modulator 5 adjustment PWM components, reach the purpose of accurate control DC voltage, the alternating current that the first oscillator produces,,, charges to internal battery after the rectifier rectification that electrochemical capacitor E12 and the 4th resistance R 4 form through the 13,14 diode D13, D14 to transformer through transformer coupled.
2, (scope range of the fluctuation of voltage surpasses+25% as city's electrical anomaly,-40%) time, by such scheme: photodetector 4 parts in city's will detect the line voltage abnormal signal and pass to and control and pulse width modulator 5, control and pulse width modulator quit work first and second magnetron G1, G2, third and fourth magnetron G3, G4 start working, the normally closed contact of relay R Y disconnects, and display provides energy by transformer, the charge closing loop.The alternating current that is formed by third and fourth magnetron G3, G4 through transformer coupled to transformer secondary output, bridge rectifier rectification via the 6th to the 16 diode D6-16 composition, provide the computer normal operation required DC voltage after filter filtering through the 3rd to the 6th inductance L 3-L6, the 3rd to the 11 electrochemical capacitor E3-E11 composition again, feed back to the master control electric current through closed-loop feedback circuit simultaneously and adjust the PWM component, reach the purpose of accurate control DC voltage.
3, normal (scope range of the fluctuation of voltage+25% in city power recovery,-40%) press such scheme the time, photodetector loop, city is transmitted to the normal signal in city power recovery and controls and pulse width modulator, control and pulse width modulator are opened first and second magnetron, turn-off simultaneously third and fourth magnetron, and release relay RY1, complete machine is got back to the civil power normal operating conditions.
Claims (1)
1. uninterrupted power source, comprise the first rectifier that city's alternating current is carried out rectification, one receives city's alternating current and it is carried out city's photodetector (4) of voltage detecting, the direct current signal that one reception the first rectifier (1) is exported and the first oscillator (2) that converts thereof into AC signal, the second oscillator (6), one receives respectively first, the AC signal of two oscillator outputs also will be converted to the ac-dc conversion device (3) of direct current signal again with it, one receives the close-loop feedback device (7) of ac-dc conversion device output direct current signal, one receives respectively the signal of city's photodetector and the output of close-loop feedback device and controls respectively first, the control of two oscillator work and pulse width modulator (5), one receives the AC signal of the first oscillator (2) or the second oscillator (6) output and is converted into the second rectifier (8) that the DC charging signal charges to internal battery, it is characterized in that: described control and pulse width modulator (5) comprise to be controlled and PWM generator, and described control and PWM generator are with the relay R Y1 of two normally closed contacts, described the first oscillator (2) comprises two group primary coils, first field effect transistor (G1) and second field effect transistor (G2) of the first resistance (R1) to the 4th resistance (R4), the 3rd electric capacity (C3) to the 6th electric capacity (C6), the second electrochemical capacitor (E2), the 5th diode (D5), the 8th diode (D8), transformer (B), the grid of the first field effect transistor connects a pin of control and PWM generator, and its grounded drain, its source electrode connect respectively the anode of the 5th diode and an end of the second resistance, the negative electrode of the 5th diode is by the second electrochemical capacitor ground connection, one end of another termination the 4th electric capacity of the second resistance, the other end of the 4th electric capacity is succeeded respectively an end of electrical equipment normally closed contact (RY1-2) and an end of the 3rd electric capacity, the output terminal of another termination the first rectifier (1) of this normally closed contact, two of one group of primary coil terminates at the two ends of the series circuit of the second resistance and the 4th electric capacity formation, one end of another termination the first resistance of the 3rd electric capacity, the other end of the first resistance is by the second electrochemical capacitor (E2) ground connection, the grid of the second field effect transistor connects another pin of control and PWM generator, and its grounded drain, its source electrode connect respectively the anode of the 8th diode and an end of the 4th resistance, the negative electrode of the 8th diode is by the second electrochemical capacitor ground connection, one end of another termination the 5th electric capacity of the 4th resistance, the other end of another termination the 4th electric capacity of the 5th electric capacity, two of another group primary coil terminates at the two ends of the series circuit of the 4th resistance and the 5th electric capacity formation, one end of another termination the 3rd resistance of the 6th electric capacity, the other end of the 3rd resistance is by the second electrochemical capacitor (E2) ground connection, the negative electrode of one termination the 5th diode of another normally closed contact (RY1-1) of relay, the input end of another termination the first rectifier (1), described the second oscillator (6) comprises third and fourth field effect transistor (G3), (G4), one group of primary coil of transformer (B) and the 9th electrochemical capacitor (E9), the grid of third and fourth field effect transistor connects respectively the two ends of control and PWM generator, the equal ground connection of their drain electrode, this connects respectively the two ends of this primary coil their source electrode two ends, described ac-dc conversion device (3) comprises that four groups of secondary coils, the 6th diode, the 7th diode, the 9th diode, the tenth diode, the 11 diode, the 12 diode, the 15 diode, the 16 diode, the 4th inductance to the six inductance, the 3rd electrochemical capacitor of transformer (B) are to electrochemical capacitor eight, the tenth electrochemical capacitor and 11 electrochemical capacitors, one termination transformer of above-mentioned the 9th electrochemical capacitor (E9) is one group of elementary center tap and connect the output terminal of the first rectifier, other end ground connection wherein, six, the anode of seven diodes (D6), (D7) connects respectively the two ends of one group of secondary coil, the 3rd inductance and third and fourth electrochemical capacitor form the ∏ mode filter, the input termination the 6th of this ∏ mode filter, the negative electrode of seven diodes, it is output as required dc output end and is the signal input part of close-loop feedback device, nine, the anode of ten diodes (D9), (D10) connects respectively the two ends of another group secondary coil, the 4th inductance and the 5th, six electrochemical capacitors form the ∏ mode filter, the input termination the 5th of this filter ∏ shape ripple device, the negative electrode of six diodes, it is output as needed direct current output, the anode of the 11,12 diodes (D11), (D12) connects respectively the two ends of another group of secondary coil, the 5th inductance and the 7th, eight electrochemical capacitors form the ∏ mode filter, the negative electrode of input termination the 11,12 diodes of this ∏ mode filter, it is output as needed direct current output, the anode of the 15,16 diodes (D15), (D16) connects respectively the two ends of one group of secondary coil again, the 6th inductance and the tenth, 11 electrochemical capacitors form the ∏ mode filter, the negative electrode of input termination the 15,16 diodes of this ∏ mode filter, it is output as needed direct current output.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101103365A CN102147651B (en) | 2010-02-09 | 2010-02-09 | Uninterruptible power supply (UPS) |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101103365A CN102147651B (en) | 2010-02-09 | 2010-02-09 | Uninterruptible power supply (UPS) |
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| CN102147651A CN102147651A (en) | 2011-08-10 |
| CN102147651B true CN102147651B (en) | 2013-05-22 |
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| CN2010101103365A Expired - Fee Related CN102147651B (en) | 2010-02-09 | 2010-02-09 | Uninterruptible power supply (UPS) |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2508449Y (en) * | 2001-10-19 | 2002-08-28 | 周忠正 | Single chip computer controlled uninterruption power supply |
| CN2509766Y (en) * | 2001-05-09 | 2002-09-04 | 凌岩 | Switch source of double-channel power source input |
| CN2520604Y (en) * | 2001-06-09 | 2002-11-13 | 周忠正 | Uninterruption power source |
| CN2525717Y (en) * | 2001-10-19 | 2002-12-11 | 周忠正 | Silicon controlled uninterrupted power supply |
| CN2772095Y (en) * | 2004-11-19 | 2006-04-12 | 广东易事特集团有限公司 | Large-sized uniterruption power source |
| CN201393076Y (en) * | 2009-03-20 | 2010-01-27 | 深圳市捷益达电子有限公司 | Uninterrupted power supply two-machine redundancy parallel connection system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10126980A (en) * | 1996-10-17 | 1998-05-15 | Fuji Electric Co Ltd | Control circuit of uninterruptive power unit |
| US7898106B2 (en) * | 2008-07-16 | 2011-03-01 | International Business Machines Corporation | DC UPS configured as intrinsic power transfer switch |
-
2010
- 2010-02-09 CN CN2010101103365A patent/CN102147651B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2509766Y (en) * | 2001-05-09 | 2002-09-04 | 凌岩 | Switch source of double-channel power source input |
| CN2520604Y (en) * | 2001-06-09 | 2002-11-13 | 周忠正 | Uninterruption power source |
| CN2508449Y (en) * | 2001-10-19 | 2002-08-28 | 周忠正 | Single chip computer controlled uninterruption power supply |
| CN2525717Y (en) * | 2001-10-19 | 2002-12-11 | 周忠正 | Silicon controlled uninterrupted power supply |
| CN2772095Y (en) * | 2004-11-19 | 2006-04-12 | 广东易事特集团有限公司 | Large-sized uniterruption power source |
| CN201393076Y (en) * | 2009-03-20 | 2010-01-27 | 深圳市捷益达电子有限公司 | Uninterrupted power supply two-machine redundancy parallel connection system |
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