CN220107821U - Flyback power supply slow start output circuit - Google Patents
Flyback power supply slow start output circuit Download PDFInfo
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- CN220107821U CN220107821U CN202223469507.0U CN202223469507U CN220107821U CN 220107821 U CN220107821 U CN 220107821U CN 202223469507 U CN202223469507 U CN 202223469507U CN 220107821 U CN220107821 U CN 220107821U
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- 239000003990 capacitor Substances 0.000 claims abstract description 78
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 32
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 32
- 239000004065 semiconductor Substances 0.000 claims abstract description 32
- 230000005669 field effect Effects 0.000 claims abstract description 31
- 238000004804 winding Methods 0.000 claims description 16
- 238000001914 filtration Methods 0.000 claims description 8
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000002159 abnormal effect Effects 0.000 description 5
- 230000010355 oscillation Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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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
Abstract
The utility model provides a flyback power supply slow start output circuit, which comprises: a front-stage flyback switching power supply and a rear-stage delay output circuit; the front-stage flyback switching power supply rectifies through an AC power supply, then generates a stable direct-current power supply through flyback conversion, and the rear-stage delay output circuit controls the turn-on of the first metal-oxide semiconductor field effect transistor Q1 through a delay circuit consisting of a resistor R3 and a capacitor C4, so that the aim that the first metal-oxide semiconductor field effect transistor Q1 is turned on to supply power to a rear-end load after the power supply voltage reaches a set value is achieved. The beneficial effects of the utility model are as follows: according to the utility model, only few components are added at the rear stage of the front-stage flyback switching power supply, so that the influence of unstable output on the sensitive load at the rear stage can be well solved when the power supply is started; the design is simple and practical, and the processing and manufacturing are simple and practical.
Description
Technical Field
The utility model relates to the field of power supplies, in particular to a flyback power supply slow start output circuit.
Background
At present, no flyback switching power supply has slow start output. The output voltage is directly connected with the back-end load, when the output voltage reaches the sensitive load working voltage, the load is started to work, so that the instantaneous power is increased, the output voltage is possibly caused to vibrate, and the back-end sensitive load is abnormal in work. The output voltage oscillation may also cause auxiliary power supply voltage oscillation, thereby causing abnormal driving of the flyback power supply.
Disclosure of Invention
The utility model provides a flyback power supply slow start output circuit which is used for delaying the start output of a flyback switching power supply and preventing the problem of abnormal power supply start caused by abnormal work of a rear-end sensitive load and instantaneous low auxiliary power supply pulled down when the load is powered on due to insufficient power oscillation in the power-on process of the power supply.
The delay circuit can control the output of the power supply by controlling the post-stage metal-oxide semiconductor field effect transistor Q1, thereby controlling the output voltage to reach the expected value before supplying power to the post-stage
The flyback power supply slow start output circuit comprises: the flyback switching power supply comprises a rectifying filter circuit, a flyback transformer T1, a control circuit, an auxiliary power supply circuit, an output filter circuit and a feedback circuit, wherein the flyback transformer T1 comprises a primary winding, an auxiliary winding and a secondary winding, the primary winding comprises a fifth terminal and a sixth terminal, the auxiliary winding comprises a third terminal and a fourth terminal, the secondary winding comprises a first terminal, a second terminal and an eighth terminal, the first terminal and the second terminal are overlapped, the control circuit is electrically connected with the fifth terminal and the sixth terminal, one end of the auxiliary power supply circuit is electrically connected with the third terminal and the fourth terminal, the output filter circuit is electrically connected with the first terminal, the second terminal and the eighth terminal, the other end of the output filter circuit is electrically connected with one end of the rear-stage delay output circuit, and the other end of the rear-stage delay output circuit is respectively electrically connected with the feedback circuit and a load.
Further, the rectifying and filtering circuit comprises a safety F1, a rectifying bridge D1 and a capacitor C1, wherein the rectifying bridge D1 comprises a first input end, a second input end, a first output end and a second output end, the first input end of the rectifying bridge D1 is electrically connected with one end of the safety F1, the other end of the safety F1 is connected with an input terminal, the second input end of the rectifying bridge D1 is electrically connected with the second input terminal, and two ends of the capacitor C1 are respectively electrically connected with the first output end of the rectifying bridge D1, a sixth terminal of the flyback transformer T1 and the second output end of the rectifying bridge D1.
Further, the control circuit includes a current mode controller U1, a second metal-oxide semiconductor field effect transistor Q2, a resistor R5, a resistor R6, a resistor R9, a capacitor C6 and a capacitor C8, where a first pin of U1 is connected to one end of the resistor R6 and the feedback circuit, a second pin of U1 is connected to one end of the capacitor C6, one end of the capacitor C8 and to the ground, a third pin of U1 is connected to a source of the second metal-oxide semiconductor field effect transistor Q2 and one end of the resistor R5, another end of the resistor R5 is grounded, a fourth pin of U1 is connected to another end of the capacitor C8 and one end of the resistor R9, another end of the resistor R9 is connected to an eighth pin of U1 and another end of the capacitor C6, an eighth pin of U1 is also connected to another end of the resistor R6, a sixth pin of U1 is connected to a gate of the second metal-oxide semiconductor field effect transistor Q2, and a seventh pin of U1 is connected to the auxiliary power supply circuit.
Further, the current mode controller U1 is model UC2844.
Further, the auxiliary power supply circuit comprises a resistor R1, a resistor R7, a diode D3 and a capacitor C5, one end of the resistor R1 is connected with the rectifying and filtering circuit and the sixth terminal of the flyback transformer T1, the other end of the resistor R1 is connected with the control circuit, one end of the resistor R7 and one end of the capacitor C5, two ends of the diode D3 are respectively connected with the other end of the resistor R7 and the third terminal of the flyback transformer T1, and the other end of the capacitor C5 and the fourth terminal of the flyback transformer T1 are grounded.
Further, the output filter circuit comprises a diode D2, a capacitor C2 and a capacitor C3, the two ends of the diode D2 are respectively connected with a first terminal and a second terminal of the flyback transformer T1, one end of the capacitor C2 and one end of the capacitor C3, the other end of the capacitor C2 and the other end of the capacitor C3 are respectively connected with an eighth terminal of the flyback transformer T1 and grounded, the capacitor C2 and the capacitor C3 are connected in parallel, and the capacitor C3 is also connected with a rear-stage delay output circuit.
Further, the post-stage delay output circuit comprises a resistor R3, a resistor R4, a capacitor C4 and a first metal-oxide semiconductor field effect transistor Q1, one end of the resistor R3 is connected with the output filter circuit and one end of a load, the other end of the resistor R3 is respectively connected with one end of the resistor R4 and one end of the capacitor C4, a grid electrode of the first metal-oxide semiconductor field effect transistor Q1 is connected with the other end of the resistor R4, a source stage of the first metal-oxide semiconductor field effect transistor Q1 is connected with the output filter circuit, a drain electrode of the first metal-oxide semiconductor field effect transistor Q1 is respectively connected with the other end of the load and the ground, and one end of the load is also connected with the feedback circuit.
Further, the feedback circuit includes a resistor R8, a resistor R10, a resistor R11, a resistor R12 and a resistor R13, a capacitor C7, a voltage reference chip TL431 and an optocoupler chip, where an input end of the optocoupler chip is connected to one end of the resistor R8 and one end of the resistor R11, another end of the resistor R8 is connected to a post-stage delay output circuit and one end of the resistor R10, another end of the resistor R10 is connected to one end of the resistor R12, a second pin of the TL431 and one end of the resistor R13, two ends of the capacitor C7 are connected to another end of the resistor R11 and another end of the resistor R12, a first pin of the TL431 is connected to another end of the resistor R11 and another end of the optocoupler chip, a third pin of the TL431 is directly grounded, an output end of the optocoupler chip is connected to a control circuit, and an output end of the optocoupler chip is grounded.
Further, the output voltage range of the front-stage flyback switching power supply is 5.0V-20.0V.
Further, the first mosfet Q1 is an NMOS transistor.
The technical scheme provided by the utility model has the beneficial effects that:
1. the delay circuit can control the starting of the rear-stage first metal-oxide semiconductor field effect transistor Q1, so that the problem of output voltage oscillation caused by insufficient power when the power supply is electrified and slowly started is avoided.
2. The problem of auxiliary power supply oscillation caused by instantaneous increase of load in the power-on slow start process of the power supply is avoided
Drawings
The utility model will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic circuit diagram of a flyback power supply slow start output circuit according to an embodiment of the present utility model;
fig. 2 is a schematic diagram of a post-stage soft start output circuit according to an embodiment of the present utility model.
Detailed Description
For a clearer understanding of technical features, objects and effects of the present utility model, a detailed description of embodiments of the present utility model will be made with reference to the accompanying drawings.
The embodiment of the utility model provides a flyback power supply slow start output circuit, which solves the problem of abnormal work of a back-end sensitive load caused by insufficient instantaneous output power of the flyback power supply, and can better avoid the defect that the power supply is not stable to supply power to the load. Referring to fig. 1, fig. 1 is a schematic diagram of a flyback power supply slow start output circuit according to an embodiment of the utility model, which specifically includes: the switching power supply comprises a front-stage flyback switching power supply circuit (a part shown outside a black box in fig. 1) and a rear-stage delay output circuit (a part shown inside the black box in fig. 1), wherein the front-stage flyback switching power supply rectifies through an AC power supply, and then generates a stable direct current power supply through flyback conversion, in the rear-stage delay output circuit, a grid electrode of a first metal-oxide semiconductor field effect transistor Q1 controls the opening of the first metal-oxide semiconductor field effect transistor Q1 through a delay circuit formed by a resistor R3 and a capacitor C4, so that the first metal-oxide semiconductor field effect transistor Q1 is started to supply power to a rear-end load after the power supply voltage reaches a set value, and the first metal-oxide semiconductor field effect transistor Q1 is an NMOS (N-channel metal oxide semiconductor) transistor.
The front-stage flyback switching power supply comprises a rectifying and filtering circuit, a flyback transformer T1, a control circuit, an auxiliary power supply circuit, an output filtering circuit and a feedback circuit, wherein the rectifying and filtering circuit comprises a safety F1, a rectifying bridge D1 and a capacitor C1, the control circuit comprises a current mode controller U1, a second metal-oxide semiconductor field effect transistor Q2 and a resistor R5, the model of the current mode controller U1 is UC2844, the auxiliary power supply circuit comprises resistors R1 and R7, a diode D3 and a capacitor C5, the output filtering circuit comprises a diode D2, a capacitor C2 and a capacitor C3, and the feedback circuit comprises resistors R8, R10, R11, R12 and R13, a capacitor C7, a voltage reference chip TL431 and an optocoupler chip; the rear-stage delay output circuit comprises a resistor R3, a resistor R4, a capacitor C4 and a first metal-oxide semiconductor field effect transistor Q1; in fig. 1, VF represents voltage sampling feedback, COMP of a first pin of the CURRENT mode controller U1 represents compensation, VFB of a second pin represents voltage feedback, VREF of an eighth pin represents reference OUTPUT, RT/CT of a fourth pin provides oscillator frequency, CURRENT SENSE of a third pin represents CURRENT sampling, OUTPUT of a sixth pin represents OUTPUT, vcc of a seventh pin represents voltage, a fuse F1, a capacitor C1 and a resistor R1 are respectively connected to a rectifier bridge D1, R1 is also connected to a diode D3 through a resistor R7, a fifth terminal and a sixth terminal of the flyback transformer T1 are primary windings, the sixth terminal is connected to the capacitors C1 and R1, the fifth terminal is connected to a drain of the first metal-oxide semiconductor field effect transistor Q2, the source of Q2 is respectively connected to ground and the third pin of U1 through R5, CURRENT sampling is performed, a gate of the second metal-oxide semiconductor field effect transistor Q2 is connected to the sixth pin of U1, the third terminal and the fourth terminal of the flyback transformer T1 are auxiliary windings, the third terminal is connected with a diode D3 and a resistor R7, then the auxiliary windings are respectively grounded through a capacitor C5 and connected with a resistor R1, the fourth terminal is directly grounded, the resistor R6 is connected with the capacitor C6 and then grounded, the resistor R6 is also connected with a resistor R9 and a capacitor C8 which are connected in series and then grounded, a first pin of U1 is respectively connected with one end of the resistor R6 and one OUTPUT end of an optocoupler chip, a second pin of U1 is connected with one end of the capacitor C6, one end of the capacitor C8 and grounded, a third pin of U1 is respectively connected with a source stage of a second metal-oxide semiconductor field effect transistor Q2 and one end of the resistor R5, the other end of the resistor R5 is grounded, a fourth pin of U1 is respectively connected with the other end of the capacitor C8 and one end of the resistor R9, the other end of the resistor R9 is respectively connected with an eighth pin of U1 and the other end of the capacitor C6, the eighth pin of U1 is also connected with the other end of the resistor R6, the sixth pin of U1 is connected with the grid electrode of the second metal-oxide semiconductor field effect transistor Q2, and the seventh pin of U1 is connected with the resistor R1. The first terminal, the second terminal and the eighth terminal of the flyback transformer T1 are secondary windings, the first terminal and the second terminal are overlapped, the first terminal and the second terminal are connected with a diode D2, then connected with a capacitor C2 and a capacitor C3 which are connected in parallel, one end of the capacitor C4 is connected with a resistor R4, the other end of the capacitor C is grounded, the grid electrode of the first metal-oxide semiconductor field effect transistor Q1 is connected with the junction of one end of the resistor R3 and the capacitor C4 through the resistor R4, the other end of the resistor R3 is respectively connected with the diode D2 and a load, the capacitor C3 and the load are sequentially connected between the source electrode and the drain electrode of the Q1, one ends of the resistors R8 and R10 are connected with the resistor R3 and the load, the first input end of the optocoupler chip is respectively connected with one end of a resistor R8 and one end of a resistor R11, the other end of the resistor R8 is respectively connected with one end of a resistor R3, a capacitor C2, a capacitor C3, a diode D2 and one end of a resistor R10, the other end of the resistor R10 is respectively connected with one end of a resistor R12, the second pin 2 of the TL431 and one end of a resistor R13, the two ends of the capacitor C7 are respectively connected with the other end of the resistor R11 and the other end of the resistor R12, the first pin 1 of the TL431 is respectively connected with the other end of the resistor R11 and the second input end of the optocoupler chip, the third pin 3 of the TL431 and the other end of the resistor R13 are directly grounded, the output end of the optocoupler chip is connected with a control circuit, and the second output end of the optocoupler chip is grounded.
After the rear-stage delay output circuit of the part shown in the black box in fig. 1 is amplified, as shown in fig. 2, the flyback circuit charges the filter capacitor after being electrified by adjusting the values of the resistor R3 and the capacitor C4, and after the capacitor voltage reaches the set voltage, the delay circuit formed by the resistor R3 and the capacitor C4 can control the first metal-oxide semiconductor field effect transistor Q1 to be turned on to supply power to a load. The time of delay output can be controlled, so that the purpose of slow start output of the flyback power supply is achieved. The output voltage range of the front-stage flyback switching power supply is 5.0V-20.0V. In this embodiment, the first mosfet Q1 is an NMOS.
The beneficial effects of the utility model are as follows: according to the utility model, only few components are added at the rear stage of the front-stage flyback switching power supply, so that the influence of unstable output on the sensitive load at the rear stage can be well solved when the power supply is started; the design is simple and practical, and the processing and manufacturing are simple and practical.
The foregoing description of the preferred embodiments of the utility model is not intended to limit the utility model to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the utility model are intended to be included within the scope of the utility model.
Claims (10)
1. A flyback power supply slow start output circuit is characterized in that: the flyback power supply slow start output circuit comprises: the flyback switching power supply comprises a rectifying filter circuit, a flyback transformer T1, a control circuit, an auxiliary power supply circuit, an output filter circuit and a feedback circuit, wherein the flyback transformer T1 comprises a primary winding, an auxiliary winding and a secondary winding, the primary winding comprises a fifth terminal and a sixth terminal, the auxiliary winding comprises a third terminal and a fourth terminal, the secondary winding comprises a first terminal, a second terminal and an eighth terminal, the first terminal and the second terminal are overlapped, the control circuit is electrically connected with the fifth terminal and the sixth terminal, the auxiliary power supply circuit is electrically connected with the third terminal and the fourth terminal, the output filter circuit is electrically connected with the first terminal, the second terminal and the eighth terminal, the other end of the output filter circuit is electrically connected with one end of the rear-stage delay output circuit, and the other end of the rear-stage delay output circuit is respectively electrically connected with the feedback circuit and a load.
2. A flyback power supply slow start output circuit as set forth in claim 1, wherein: the rectifying and filtering circuit comprises a safety F1, a rectifying bridge D1 and a capacitor C1, wherein the rectifying bridge D1 comprises a first input end, a second input end, a first output end and a second output end, the first input end of the rectifying bridge D1 is electrically connected with one end of the safety F1, the other end of the safety F1 is connected with an input terminal, the second input end of the rectifying bridge D1 is electrically connected with the second input terminal, and two ends of the capacitor C1 are respectively electrically connected with the first output end of the rectifying bridge D1, a sixth terminal of the flyback transformer T1 and the second output end of the rectifying bridge D1.
3. A flyback power supply slow start output circuit as set forth in claim 1, wherein: the control circuit comprises a current mode controller U1, a second metal-oxide semiconductor field effect transistor Q2, a resistor R5, a resistor R6, a resistor R9, a capacitor C6 and a capacitor C8, wherein a first pin of the U1 is respectively connected with one end of the resistor R6 and a feedback circuit, a second pin of the U1 is connected with one end of the capacitor C6, one end of the capacitor C8 and the other end of the resistor R5, a third pin of the U1 is respectively connected with a source of the second metal-oxide semiconductor field effect transistor Q2 and one end of the resistor R5, the other end of the resistor R5 is grounded, a fourth pin of the U1 is respectively connected with the other end of the capacitor C8 and one end of the resistor R9, the other end of the resistor R9 is respectively connected with an eighth pin of the U1 and the other end of the capacitor C6, a sixth pin of the U1 is also connected with the other end of the resistor R6, and a sixth pin of the U1 is connected with a grid of the second metal-oxide semiconductor field effect transistor Q2, and a seventh pin of the U1 is connected with an auxiliary power supply circuit.
4. A flyback power slow start output circuit as set forth in claim 3, wherein: the model of the current mode controller U1 is UC2844.
5. A flyback power supply slow start output circuit as set forth in claim 1, wherein: the auxiliary power supply circuit comprises a resistor R1, a resistor R7, a diode D3 and a capacitor C5, wherein one end of the resistor R1 is respectively connected with a rectifying and filtering circuit and a sixth terminal of the flyback transformer T1, the other end of the resistor R1 is respectively connected with a control circuit, one end of the resistor R7 and one end of the capacitor C5, two ends of the diode D3 are respectively connected with the other end of the resistor R7 and a third terminal of the flyback transformer T1, and the other end of the capacitor C5 and a fourth terminal of the flyback transformer T1 are grounded.
6. A flyback power supply slow start output circuit as set forth in claim 1, wherein: the output filter circuit comprises a diode D2, a capacitor C2 and a capacitor C3, wherein two ends of the diode D2 are respectively connected with a first terminal and a second terminal of the flyback transformer T1, one end of the capacitor C2 and one end of the capacitor C3, the other end of the capacitor C2 and the other end of the capacitor C3 are respectively connected with an eighth terminal of the flyback transformer T1 and the ground, the capacitor C2 and the capacitor C3 are connected in parallel, and the capacitor C3 is also connected with a rear-stage delay output circuit.
7. A flyback power supply slow start output circuit as set forth in claim 1, wherein: the post-stage delay output circuit comprises a resistor R3, a resistor R4, a capacitor C4 and a first metal-oxide semiconductor field effect transistor Q1, wherein one end of the resistor R3 is respectively connected with the output filter circuit and one end of a load, the other end of the resistor R3 is connected with one end of the resistor R4 and one end of the capacitor C4, a grid electrode of the first metal-oxide semiconductor field effect transistor Q1 is connected with the other end of the resistor R4, a source electrode of the first metal-oxide semiconductor field effect transistor Q1 is connected with the output filter circuit, a drain electrode of the first metal-oxide semiconductor field effect transistor Q1 is respectively connected with the other end of the load and the ground, and one end of the load is also connected with the feedback circuit.
8. A flyback power supply slow start output circuit as set forth in claim 1, wherein: the feedback circuit comprises a resistor R8, a resistor R10, a resistor R11, a resistor R12 and a resistor R13, a capacitor C7, a voltage reference chip TL431 and an optocoupler chip, wherein the input end of the optocoupler chip is respectively connected with one end of the resistor R8 and one end of the resistor R11, the other end of the resistor R8 is respectively connected with a rear-stage delay output circuit and one end of the resistor R10, the other end of the resistor R10 is respectively connected with one end of the resistor R12, a TL431 second pin (2) and one end of the resistor R13, the two ends of the capacitor C7 are respectively connected with the other end of the resistor R11 and the other end of the resistor R12, a first pin (1) of the TL431 is respectively connected with the other end of the resistor R11 and the input end of the optocoupler chip II, a third pin (3) of the TL431 and the other end of the resistor R13 are directly grounded, the output end of the optocoupler chip is connected with the control circuit, and the output end of the optocoupler chip II is grounded.
9. A flyback power supply slow start output circuit as set forth in claim 1, wherein: the output voltage range of the front-stage flyback switching power supply is 5.0V-20.0V.
10. The flyback power slow start output circuit of claim 7, wherein: the first metal-oxide semiconductor field effect transistor Q1 is an NMOS transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223469507.0U CN220107821U (en) | 2022-12-23 | 2022-12-23 | Flyback power supply slow start output circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223469507.0U CN220107821U (en) | 2022-12-23 | 2022-12-23 | Flyback power supply slow start output circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220107821U true CN220107821U (en) | 2023-11-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223469507.0U Active CN220107821U (en) | 2022-12-23 | 2022-12-23 | Flyback power supply slow start output circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220107821U (en) |
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2022
- 2022-12-23 CN CN202223469507.0U patent/CN220107821U/en active Active
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