CN112104213A - Surge current suppression circuit - Google Patents
Surge current suppression circuit Download PDFInfo
- Publication number
- CN112104213A CN112104213A CN202010726858.1A CN202010726858A CN112104213A CN 112104213 A CN112104213 A CN 112104213A CN 202010726858 A CN202010726858 A CN 202010726858A CN 112104213 A CN112104213 A CN 112104213A
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- Prior art keywords
- circuit
- switch
- resistor
- current suppression
- inrush current
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- 230000001629 suppression Effects 0.000 title claims abstract description 68
- 238000006243 chemical reaction Methods 0.000 claims abstract description 46
- 239000003990 capacitor Substances 0.000 description 11
- 208000025274 Lightning injury Diseases 0.000 description 6
- 239000004065 semiconductor Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 101100334593 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) RAD27 gene Proteins 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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Classifications
-
- 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
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/005—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection avoiding undesired transient conditions
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
Abstract
The invention discloses an inrush current suppression circuit which comprises a first switch and a first resistor, wherein the first switch and the first resistor are connected in series to form the inrush current suppression circuit, and the inrush current suppression circuit is connected between the input positive pole and the output positive pole of a DC-DC conversion circuit in parallel. The surge current suppression circuit provided by the invention can effectively suppress surge current, is simple to control, and does not generate extra loss when the power supply normally works.
Description
Technical Field
The present invention relates to the field of switching power supplies, and more particularly to a surge current suppression circuit.
Background
As shown IN fig. 1, the AC-DC switching power supply includes a front-stage AC-DC circuit 11 and a rear-stage DC-DC circuit 12, the front-stage AC-DC circuit 11 is a full-bridge rectifier circuit and includes four rectifier diodes D1-D4, an input AC1-2 of the front-stage AC-DC circuit 11 is connected to an AC input power supply, an output of the front-stage AC-DC circuit is connected to an input IN1-2 of the rear-stage DC-DC circuit, and the rear-stage DC-DC circuit is a boost converter circuit and includes a capacitor C1, an inductor L1, a switch Q1, a diode D4, and a first resistor RTH connected IN series to the input AC1 for limiting an inrush current generated by the AC-DC switching power supply 10 at the moment of connecting to the AC input power supply. However, the first resistor RTH1 generates loss, which reduces the efficiency of the AC-DC switching power supply, and the loss of the first resistor RTH is more significant when the input voltage is low (e.g. 100 Vac). In the prior art, a relay RLY is connected in parallel to the first resistor RTH. When an input power supply is switched on, the relay RLY is switched off, and the first resistor RTH is connected in series in the circuit to reduce surge current; and after the AC-DC switching power supply is started, the relay RLY is closed, and the adverse effect of the first resistor RTH on the efficiency is eliminated. However, the introduction of the relay RLY increases the complexity of control, the relay RLY also has the problem of mechanical life, and in some occasions with harsh use environments, such as high-vibration occasions, the relay RLY can bring certain potential safety hazards.
Disclosure of Invention
The invention has been made in view of the above problems, and it is an object of the present invention to provide a surge current suppressing circuit in which a first resistor and a diode are connected in series and then connected in parallel between an anode input terminal and an anode output terminal of a DC-DC circuit, the diode is turned on at the moment when an input power is turned on, the surge current is suppressed by the first resistor, the diode is turned off after the power is normally operated, and the first resistor is cut off outside the circuit, thereby not affecting the operating efficiency of the power.
An inrush current suppression circuit comprises a first switch and a first resistor, wherein the first switch is connected with the first resistor in series, and the inrush current suppression circuit is connected between an input end and an output end of a power conversion circuit in parallel.
The electric energy conversion circuit is a DC-DC conversion circuit, and the surge current suppression circuit is connected in parallel between the input positive electrode and the output positive electrode of the DC-DC conversion circuit.
The first switch is connected in parallel between the input positive pole and the output positive pole of the DC-DC conversion circuit, and the first resistor is connected in series at the output end of the DC-DC conversion circuit.
The DC-DC conversion circuit is a DC-DC boost conversion circuit, the first switch is a diode, an anode of the first switch is connected to an input anode of the DC-DC conversion circuit, and a cathode of the first switch is connected to an output anode of the DC-DC conversion circuit.
And two ends of the first resistor are connected with a lightning stroke suppression circuit in parallel.
The DC-DC conversion circuit is a BOOST conversion circuit or a flyback conversion circuit.
The invention also provides an AC-DC switching power supply, which comprises an inrush current suppression circuit, a rectification circuit and a DC-DC conversion circuit, wherein the rectification circuit receives alternating current input, the output of the rectification circuit is connected with the input of the DC-DC conversion circuit, and the inrush current suppression circuit is connected with the input positive pole and the output positive pole of the DC-DC conversion circuit in parallel.
The inrush current suppression circuit comprises a second switch and a second resistor, wherein the second switch is connected in series with the second resistor, the second switch is a diode, the anode of the second switch is connected with the input anode of the DC-DC conversion circuit, and the cathode of the second switch is connected with the output anode of the DC-DC conversion circuit.
The second resistor is connected in series between the output ends of the DC-DC conversion circuit.
And two ends of the second resistor are connected with a lightning stroke suppression circuit in parallel.
The invention also provides an AC-DC switching power supply, which comprises an inrush current suppression circuit and an AC-DC conversion circuit, wherein the AC-DC conversion circuit comprises an alternating current input end and a direct current output end, the direct current output end comprises an output positive pole and an output negative pole, the first end of the inrush current suppression circuit is connected with one end of the alternating current input end of the AC-DC conversion circuit, and the second end of the inrush current suppression circuit is connected with the output positive pole of the AC-DC conversion circuit.
The AC-DC conversion circuit is a bridgeless PFC circuit, the surge current suppression circuit comprises a third switch and a third resistor, the third switch and the third resistor are connected in series, the third switch is a diode, the anode of the third switch is connected with one end of the alternating current input end of the AC-DC conversion circuit, and the cathode of the third switch is connected with the output anode of the AC-DC conversion circuit.
The first end of the surge current suppression circuit is connected with one end of an alternating current input end of the AC-DC conversion circuit and then connected with a fourth switch, the fourth switch is a diode, the first end of the surge current suppression circuit is connected with a cathode of the fourth switch, and an anode of the fourth switch is connected with an output cathode of the AC-DC switching power supply.
The third resistor is connected in series between the output ends of the AC-DC conversion circuit.
And two ends of the third resistor are connected with a lightning stroke suppression circuit in parallel.
The technical scheme of the invention has good surge current suppression function, does not generate extra loss when the switching power supply works normally, and does not influence the lightning protection performance of the circuit.
In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1 shows an inrush current suppression circuit in the prior art.
Fig. 2 is a configuration diagram of an inrush current suppression circuit according to a first embodiment of the present invention.
Fig. 3 is a configuration diagram of an inrush current suppression circuit according to a second embodiment of the present invention.
Fig. 4 shows a first specific example of the inrush current suppression circuit according to the first embodiment of the present invention.
Fig. 5 shows a second embodiment of the inrush current suppression circuit according to the first embodiment of the present invention.
Fig. 6 shows a third specific example of the inrush current suppression circuit according to the first embodiment of the present invention.
Fig. 7 shows a fourth specific example of the inrush current suppression circuit according to the first embodiment of the present invention.
Detailed Description
In order to make the purpose and technical solution of the embodiments of the present invention clearer, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
As shown IN fig. 2, the DC-DC boost converter circuit 23 includes an input positive electrode IN3 and an input negative electrode IN4, and further includes an output positive electrode OUT3 and an output negative electrode OUT4, the surge current suppression circuit 20 of the present invention includes a diode D6 and a first resistor RTH, the diode D6 is connected IN series with a resistor RTH, and the resistor RTH is a thermistor or a power resistor. One end of the inrush current suppression circuit 20 is connected to an input positive electrode IN3 of the DC-DC boost converter circuit, the other end of the inrush current suppression circuit 20 is connected to an output positive electrode OUT3 of the DC-DC boost converter circuit, more specifically, an anode of the diode D6 is connected to the input positive electrode IN3 of the DC-DC boost converter circuit, and a cathode of the diode D6 is connected to the output positive electrode OUT3 of the DC-DC boost converter circuit.
As shown IN fig. 3, the DC-DC buck converter circuit 33 includes an input positive electrode IN5 and an input negative electrode IN6, and further includes an output positive electrode OUT5 and an output negative electrode OUT6, and the surge current suppression circuit 30 of the present invention includes a diode D7 and a resistor RTH, which is a thermistor or a power resistor. The diode D7 and the resistor RTH are connected IN series, one end of the inrush current suppression circuit 30 is connected to the input positive electrode IN5 of the DC-DC buck converter circuit 33, the other end of the inrush current suppression circuit 30 is connected to the output positive electrode OUT5 of the DC-DC buck converter circuit 33, more specifically, the cathode of the diode D7 is connected to the input positive electrode IN5 of the DC-DC boost converter circuit 33, and the anode of the diode D7 is connected to the output positive electrode OUT5 of the DC-DC buck converter circuit 33.
As shown in fig. 4, which is a first specific example of the first embodiment shown in fig. 2 of the present invention, the DC-DC BOOST converter circuit 23 is a DC-DC BOOST converter circuit 42 in fig. 4, and is a circuit with a BOOST structure, the DC-DC BOOST converter circuit 42 includes a capacitor C1, an inductor L1, a switch Q1, a switch D5, and a capacitor C2, the capacitor C1 and the inductor L1 are connected in parallel with a series branch of the switch Q1, and the switch Q1 is connected in parallel with a series branch of the switch D5 and the capacitor C2. The switch Q1 is a controllable switch, such as an insulated gate bipolar transistor, a metal-oxide semiconductor field effect transistor, a semiconductor triode, etc., and the switch D5 is a freewheeling switch, such as an uncontrolled switch, e.g., a diode, or a controllable switch, such as a metal-oxide semiconductor field effect transistor, etc. The inrush current suppression circuit 40 includes the diode D6 and a resistor RTH, the diode D6 and the resistor RTH are connected in series, and the inrush current suppression circuit 40 is connected in parallel with the DC-DC boost conversion circuit 42. The anode of the diode D6 is connected to the input anode IN1 of the DC-DC boost converter circuit 42, and the cathode of the diode D6 is connected to the output anode OUT1 of the DC-DC boost converter circuit 42.
In this embodiment, a rectifying circuit 41 is connected in series at the front stage of the DC-DC boost converter circuit 42, the rectifying circuit 41 is a full-bridge rectifying circuit, and includes diodes D1/D2/D3/D4, and the diodes D1/D2/D3/D4 form a full-bridge rectifying circuit, which rectifies the AC power at the AC input end AC1-2 into DC power and outputs the DC power to the DC-DC boost converter circuit 42.
FIG. 5 is another embodiment of the present invention, which is different from the embodiment of FIG. 4 in that the surge current suppressing circuit 50 further includes a lightning strike suppressing circuit U1, and the lightning strike suppressing circuit U1 has a very large impedance when the voltage across the lightning strike suppressing circuit U1 is smaller than a predetermined value; when the voltage across the resistor is greater than a predetermined value, the impedance of the resistor is instantaneously lowered. The lightning strike suppression circuit U1 is a gas discharge tube or a voltage regulator tube or a voltage clamping transient suppression diode or a voltage dependent resistor or other devices.
In the above embodiment, at the moment when the AC input terminal AC1-2 is connected to the mains supply, the resistor RTH is used to suppress the surge current; when the power supply normally works, the voltage at the two ends of the capacitor C2 is higher than the voltage at the two ends of the capacitor C1, so that the diode D6 is cut off, no current flows in the resistor RTH, and no loss is generated; when a lightning strike occurs, the diode D6 and the lightning strike suppression circuit U1 together provide a low impedance return path for energy from the lightning strike to be absorbed by the C2.
Fig. 6 shows another embodiment of the present invention, which is different from fig. 5 in that a switch 601 of the inrush current suppression circuit 60 is connected in parallel with the DC-DC boost converter circuit 62, and a resistor 602 of the inrush current suppression circuit 60 is connected in series between the output terminals OUT1-2 of the DC-DC boost converter circuit 62. When the DC-DC boost converter circuit 62 is operating normally, the voltage at the IN1 terminal is higher than the voltage at the OUT1 terminal, so D6 is turned off; when a lightning strike occurs, D6 and U1 together provide a low impedance return path for the energy of the strike to be absorbed by C2.
In normal operation, a certain current flows through the RTH, but the effective value of the current is much smaller than that of the current on the ac input side, so that the loss caused by the RTH can be significantly reduced.
Fig. 7 is another specific embodiment of the present invention, where the boost converter circuit is a bridgeless PFC circuit, the bridgeless PFC circuit includes an inductor L2, a diode D9, a diode D10, a diode D11, a diode D12, a controllable switch Q2, and a controllable switch Q3, the diode D9 and the controllable switch Q2 are connected in series to form a first bridge arm unit, the diode D10 and the controllable switch Q3 are connected in series to form a second bridge arm unit, a first end of the inductor L2 is connected to an AC input terminal AC3, another end of the inductor L2 is connected to a bridge arm midpoint of the first bridge arm unit, the bridge arm midpoint of the second bridge arm unit is an AC input terminal AC4, an AC power is connected between AC power input terminals AC3-4, the first bridge arm unit and the second bridge arm unit are connected in parallel, and after the parallel connection, two ends of the first bridge arm unit and the second bridge arm unit are dc output terminals OUT7-8, and the capacitor C2 is connected with a capacitor C2 in parallel and is a filter capacitor. The surge current suppression circuit 70 is connected in parallel between an alternating current input end AC3 and a direct current output end OUT7, a diode D12 is connected in series between the alternating current input end AC3 and the direct current output end OUT8, the cathode of the diode D12 is connected with the alternating current input end AC3, and the anode of the diode D12 is connected with the direct current output end OUT 8.
The diode D12 is used for the input AC power to be positive half cycle at the input end AC3, the surge current suppression circuit 60 is connected in parallel between the AC input end AC3 and the dc output end OUT7, and for the input AC power to be negative half cycle at the input end AC3, the surge current suppression circuit is connected in parallel at two ends of the dc output end OU 7-8.
However, the present invention is not limited thereto, and the surge current suppression circuit 60 may be connected in parallel between the AC input terminal AC4 and the dc output terminal OUT7, and a diode D12 may be connected in series between the AC input terminal AC4 and the dc output terminal OUT8, a cathode of the diode D12 is connected to the AC input terminal AC4, and an anode of the diode D12 is connected to the dc output terminal OUT 8.
The surge current suppression circuit can use the first resistor to suppress surge current at the moment that the power conversion device is connected with commercial power; when the power supply works normally, current does not flow in the first resistor, so that the surge current suppression circuit remarkably reduces loss generated by the first resistor; when a lightning stroke occurs, the lightning stroke restraining unit can provide a low-impedance loop, and the energy of the lightning stroke is absorbed by the capacitor at the direct current output end.
Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.
Claims (15)
1. An inrush current suppression circuit is characterized by comprising a first switch and a first resistor, wherein the first switch is connected with the first resistor in series, and the inrush current suppression circuit is connected between an input end and an output end of a power conversion circuit in parallel.
2. The inrush current suppression circuit of claim 1, wherein the power conversion circuit is a DC-DC conversion circuit, and the inrush current suppression circuit is connected in parallel between an input positive pole and an output positive pole of the DC-DC conversion circuit.
3. The inrush current suppression circuit of claim 2, wherein the first switch is connected in parallel between an input positive terminal and an output positive terminal of the DC-DC converter circuit, and the first resistor is connected in series at an output terminal of the DC-DC converter circuit.
4. The inrush current suppression circuit of claim 2, wherein the DC-DC converter circuit is a DC-DC boost converter circuit, the first switch is a diode, an anode of the first switch is connected to an input anode of the DC-DC converter circuit, and a cathode of the first switch is connected to an output anode of the DC-DC converter circuit.
5. The inrush current suppression circuit of claim 1, wherein a lightning strike suppression circuit is connected in parallel across the first resistor.
6. The inrush current suppression circuit of claim 4, wherein the DC-DC converter circuit is a BOOST converter circuit or a flyback converter circuit.
7. An AC-DC switching power supply is characterized by comprising an inrush current suppression circuit, a rectification circuit and a DC-DC conversion circuit, wherein the rectification circuit receives an alternating current input, the output of the rectification circuit is connected with the input of the DC-DC conversion circuit, and the inrush current suppression circuit is connected with the input positive pole and the output positive pole of the DC-DC conversion circuit in parallel.
8. An AC-DC switching power supply according to claim 7, wherein the inrush current suppression circuit includes a second switch and a second resistor, the second switch and the second resistor being connected in series, the second switch being a diode, an anode of the second switch being connected to the input anode of the DC-DC conversion circuit, and a cathode of the second switch being connected to the output anode of the DC-DC conversion circuit.
9. An AC-DC switching power supply according to claim 8, wherein said second resistor is connected in series between output terminals of said DC-DC conversion circuit.
10. An AC-DC switching power supply according to claim 8 wherein a lightning strike suppression circuit is connected in parallel across said second resistor.
11. An AC-DC switching power supply is characterized by comprising an inrush current suppression circuit and an AC-DC conversion circuit, wherein the AC-DC conversion circuit comprises an alternating current input end and a direct current output end, the direct current output end comprises an output positive pole and an output negative pole, a first end of the inrush current suppression circuit is connected with one end of the alternating current input end of the AC-DC conversion circuit, and a second end of the inrush current suppression circuit is connected with the output positive pole of the AC-DC conversion circuit.
12. An AC-DC switching power supply according to claim 11, wherein the AC-DC converting circuit is a bridgeless PFC circuit, the inrush current suppressing circuit includes a third switch and a third resistor, the third switch and the third resistor are connected in series, the third switch is a diode, an anode of the third switch is connected to one end of the AC input terminal of the AC-DC converting circuit, and a cathode of the third switch is connected to an output anode of the AC-DC converting circuit.
13. An AC-DC switching power supply according to claim 11, wherein a first terminal of the inrush current suppression circuit is connected to one terminal of an AC input terminal of the AC-DC conversion circuit and then connected to a fourth switch, the fourth switch is a diode, the first terminal of the inrush current suppression circuit is connected to a cathode of the fourth switch, and an anode of the fourth switch is connected to a negative output terminal of the AC-DC switching power supply.
14. An AC-DC switching power supply according to claim 12, wherein said third resistor is connected in series between the output terminals of said AC-DC converting circuit.
15. An AC-DC switching power supply according to claim 12 wherein a lightning strike suppression circuit is connected in parallel across said third resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010726858.1A CN112104213A (en) | 2020-07-26 | 2020-07-26 | Surge current suppression circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010726858.1A CN112104213A (en) | 2020-07-26 | 2020-07-26 | Surge current suppression circuit |
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| Publication Number | Publication Date |
|---|---|
| CN112104213A true CN112104213A (en) | 2020-12-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010726858.1A Pending CN112104213A (en) | 2020-07-26 | 2020-07-26 | Surge current suppression circuit |
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| CN (1) | CN112104213A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115276396A (en) * | 2022-09-26 | 2022-11-01 | 长城电源技术有限公司 | Bridgeless PFC circuit with lightning surge protection |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101958657A (en) * | 2009-07-17 | 2011-01-26 | 华为技术有限公司 | Power supply switching circuit, equipment and alternate control method of power factor correction circuit |
| CN206585319U (en) * | 2017-03-13 | 2017-10-24 | 深圳Tcl新技术有限公司 | Anti-surging power circuit |
| CN109546853A (en) * | 2019-01-03 | 2019-03-29 | 浙江鲲悟科技有限公司 | The active PFC circuit and frequency changing driving system of Anti-surging |
| US20190326829A1 (en) * | 2017-01-06 | 2019-10-24 | Panasonic Intellectual Property Management Co., Ltd. | Ac-dc converter |
-
2020
- 2020-07-26 CN CN202010726858.1A patent/CN112104213A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101958657A (en) * | 2009-07-17 | 2011-01-26 | 华为技术有限公司 | Power supply switching circuit, equipment and alternate control method of power factor correction circuit |
| US20190326829A1 (en) * | 2017-01-06 | 2019-10-24 | Panasonic Intellectual Property Management Co., Ltd. | Ac-dc converter |
| CN206585319U (en) * | 2017-03-13 | 2017-10-24 | 深圳Tcl新技术有限公司 | Anti-surging power circuit |
| CN109546853A (en) * | 2019-01-03 | 2019-03-29 | 浙江鲲悟科技有限公司 | The active PFC circuit and frequency changing driving system of Anti-surging |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115276396A (en) * | 2022-09-26 | 2022-11-01 | 长城电源技术有限公司 | Bridgeless PFC circuit with lightning surge protection |
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