CN220964393U - Power supply circuit, circuit board assembly and electronic equipment - Google Patents
Power supply circuit, circuit board assembly and electronic equipment Download PDFInfo
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- CN220964393U CN220964393U CN202322435649.3U CN202322435649U CN220964393U CN 220964393 U CN220964393 U CN 220964393U CN 202322435649 U CN202322435649 U CN 202322435649U CN 220964393 U CN220964393 U CN 220964393U
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- 230000002159 abnormal effect Effects 0.000 claims abstract description 19
- 238000001514 detection method Methods 0.000 claims abstract description 18
- 238000004146 energy storage Methods 0.000 claims description 28
- 238000012546 transfer Methods 0.000 claims description 8
- 239000003990 capacitor Substances 0.000 claims description 7
- 230000009977 dual effect Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000009826 distribution Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000010924 continuous production Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
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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
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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Abstract
The embodiment of the application relates to the technical field of circuits, and discloses a power supply circuit, a circuit board assembly and electronic equipment, wherein the power supply circuit comprises: the device comprises a power supply switching unit, a voltage detection unit, a control unit and a voltage compensation unit; the two input ends of the power supply switching unit are respectively connected with a main power supply and a standby power supply, the output end of the power supply switching unit is connected with the first end of the voltage compensation unit, and the second end of the voltage compensation unit is connected with electric equipment; the first end of the voltage detection unit is connected with the output end of the power supply switching unit, the second end of the voltage detection unit is connected with the control unit, and the control unit is also connected with the control end of the voltage compensation unit; the voltage detection unit is used for detecting the voltage of the output end of the power supply switching unit in real time; the control unit is used for controlling the voltage compensation unit to provide compensation voltage for the electric equipment under the condition of abnormal voltage. In the dual-power switching process, the embodiment of the application ensures that the electric equipment can work stably and improves the production efficiency of the electric equipment.
Description
Technical Field
The embodiment of the application relates to the technical field of circuits, in particular to a power supply circuit, a circuit board assembly and electronic equipment.
Background
At present, along with the continuous development of intelligent power distribution in the fields of industrial control, medical equipment, precision manufacturing and the like, not only is a higher power factor required for efficient production, but also the reliability of power distribution is required, so that more and more power supply loops are applied to a frequency converter to improve the power utilization efficiency, and a dual-power switching device is arranged at the front end of a circuit to enhance the power utilization reliability. When the power distribution network has line faults, the power distribution network can be quickly switched to the power grid at the other side.
However, in the process of switching the dual power supplies, the voltage of the power grid is temporarily lost, voltage fluctuation of different degrees can be caused even if the time is short, a semiconductor control device in the frequency converter is extremely easy to damage due to surge impact caused by the fluctuation of the power grid, if the recovery time of the power grid is slower, the frequency converter can be tripped due to low voltage quickly, continuous production is stopped, and immeasurable loss is caused.
Disclosure of utility model
The embodiment of the application aims to provide a power supply circuit, a circuit board assembly and electronic equipment, so that even in the double-power switching process, stable work of electric equipment can be ensured, and the production efficiency of the electric equipment is improved.
To solve the above technical problem, an embodiment of the present application provides a power supply circuit, including: the device comprises a power supply switching unit, a voltage detection unit, a control unit and a voltage compensation unit; the two input ends of the power supply switching unit are respectively connected with the main power supply and the standby power supply, the output end of the power supply switching unit is connected with the first end of the voltage compensation unit, and the second end of the voltage compensation unit is connected with electric equipment; the first end of the voltage detection unit is connected with the output end of the power supply switching unit, the second end of the voltage detection unit is connected with the control unit, and the control unit is also connected with the control end of the voltage compensation unit; the voltage detection unit is used for detecting the voltage of the output end of the power supply switching unit in real time; the control unit is used for controlling the voltage compensation unit to provide compensation voltage for the electric equipment under the condition of abnormal voltage.
The embodiment of the application also provides a circuit board assembly, which comprises the power supply circuit.
The embodiment of the application also provides electronic equipment, which comprises the circuit board assembly.
In addition, the voltage compensation unit includes: the device comprises a primary coil, a secondary coil, an inverter and a direct current energy storage module; the positive output end and the negative output end of the direct current energy storage module are respectively connected with the positive input end and the negative input end of the inverter, and the positive output end and the negative output end of the inverter are respectively connected with the two ends of the primary coil; two ends of the secondary coil are respectively used as a first end of the voltage compensation unit and a second end of the voltage compensation unit; the control unit is connected with the control end of the voltage compensation unit, and specifically comprises: the control unit is connected with the control end of the inverter; the control unit is used for controlling the inverter to convert direct current of the direct current energy storage module into alternating current under the condition of abnormal voltage so as to provide the compensation voltage for the electric equipment.
In addition, the inverter is a rectifying inverter; the rectification inverter converts direct current of the direct current energy storage module into alternating current under the condition that the voltage is abnormal so as to provide the compensation voltage for the electric equipment; and under the condition that the voltage is normal, the rectification inverter converts the alternating current of the primary coil into direct current so as to charge the direct current energy storage module.
In addition, the voltage compensation unit further comprises a filter; the filter is disposed between the inverter and the primary coil.
In addition, the voltage compensation unit also comprises a direct current support capacitor; and two ends of the direct current support capacitor are respectively connected with a positive output end and a negative output end of the direct current energy storage module.
In addition, the power supply switching unit is a dual-power supply automatic transfer switch.
In addition, the rectifier inverter is a voltage source inverter.
In addition, the primary coil and the secondary coil are provided by a transformer or a reactor.
Drawings
One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to be taken in a limiting sense, unless otherwise indicated.
Fig. 1 is a schematic circuit diagram of a power supply circuit according to an embodiment of the present application;
FIG. 2 is a schematic circuit diagram of a power supply circuit according to an embodiment of the application;
FIG. 3 is a schematic circuit diagram of a power supply circuit according to an embodiment of the application;
Fig. 4 is a schematic circuit configuration diagram of a power supply circuit according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the embodiments of the present application will be described in detail below with reference to the accompanying drawings. However, it will be understood by those of ordinary skill in the art that in various embodiments of the present application, numerous specific details are set forth in order to provide a thorough understanding of the present application. The claimed application may be practiced without these specific details and with various changes and modifications based on the following embodiments. The following embodiments are divided for convenience of description, and should not be construed as limiting the specific implementation of the present application, and the embodiments can be mutually combined and referred to without contradiction.
An embodiment of the present application relates to a power supply circuit, and a schematic circuit structure is shown in fig. 1, where a power supply circuit 10 includes: a power supply switching unit 101, a voltage detecting unit 102, a control unit 103, and a voltage compensating unit 104.
Specifically, two input ends of the power supply switching unit 101 are respectively connected with a main power supply 201 and a standby power supply 202, an output end of the power supply switching unit 101 is connected with a first end of the voltage compensation unit 104, and a second end of the voltage compensation unit 104 is connected with the electric equipment 203; the first end of the voltage detection unit 102 is connected with the output end of the power supply switching unit 101, the second end of the voltage detection unit 102 is connected with the control unit 103, and the control unit 103 is also connected with the control end of the voltage compensation unit 104; the voltage detection unit 102 is configured to detect the voltage of the output terminal of the power switching unit 101 in real time; the control unit 103 is configured to control the voltage compensation unit 104 to provide the compensation voltage to the powered device 203 in case of the voltage abnormality.
Specifically, the input end of the power switching unit 101 is connected to the main power 201 and the standby power 202, and detects the voltage states of the two power supplies on the network side, when the main power 201 fails or loses power, the power switching unit automatically switches to the standby power 202 to continue to operate, and the switching time Δt=Δt1+Δt2 of the power switching unit 101, where Δt1 is the switching action time and is the artificial delay time Δt2. The voltage detection unit 102 collects and monitors the power grid voltage at the output end of the power supply switching unit 101 in real time, the control unit 103 can rapidly detect the starting and ending time of the voltage sag, and once the power grid voltage is instantaneously power-off, the voltage sag or other voltage disturbance within the conversion delta t time, the control unit 103 generates accurate compensation command voltage signals including the sag compensation command signals and the total distortion compensation command signals except for the voltage fundamental component, so that the voltage compensation unit 104 can generate accurate compensation voltage.
In the related art, in a dual-power switching circuit, when a main power supply fails, the main power supply is quickly switched to a standby power supply, and after the failure is removed, the main power supply can be automatically switched back to the standby power supply; even if the switching process between the main power supply and the standby power supply is very short, the power grid voltage is temporarily lost, voltage fluctuation of different degrees is caused, the follow-up electric equipment such as a semiconductor control device in a frequency converter is extremely easy to damage due to surge impact caused by the power grid fluctuation, if the power grid recovery time is slower, the electric equipment can also trip due to low voltage, continuous production is stopped, and immeasurable loss is caused.
That is, since the dual-power switching unit 101 is switched from the main power supply 201 to the standby power supply 202, or the voltage of the power grid is reduced to a certain extent in the process of switching the standby power supply 202 to the main power supply 201, enough working voltage cannot be provided for the electric equipment, that is, the operation of the electric equipment is abnormal due to short power loss of the power grid voltage.
Therefore, in this embodiment, by setting the voltage detection unit 102, the control unit 103, and the voltage compensation unit 104 in the dual-power switching power supply circuit 10, the voltage detection unit 102 obtains the voltage of the output end of the power switching unit 101, that is, the voltage of the power grid in real time, and transmits the voltage to the control unit 103, and the control unit 103 can determine whether the power grid is in an abnormal state according to the voltage, at this time, the power switching unit 101 switches the power to protect the circuit, and in the switching process, the voltage is greatly reduced; meanwhile, the control unit 103 controls the voltage compensation unit 104 to provide the compensation voltage for the power utilization unit 203 when the voltage is abnormal, so that the compensation voltage is provided for the power utilization unit 203 when the voltage is abnormal, and the power utilization unit 203 can work stably, and the production efficiency is improved. In addition, in this embodiment, since the compensation voltage is rapidly provided to the electric device 203 when the power grid voltage is in an abnormal state, the voltage input to the electric device 203 can be rapidly adjusted, the time can be controlled within 1ms, the voltage input to the electric device 203 is relatively stable, the voltage input to the electric device 203 is prevented from being changed greatly, and the electric device 203 is prevented from being damaged in the process of changing the voltage greatly.
In one embodiment, the power switching unit 101 is a dual power Automatic TRANSFER SWITCHING (ATS) switch. The double-power automatic transfer switch ATS is composed of two transfer switch electric appliances and other necessary electric appliances, has the capacity of judging the under-voltage and under-voltage faults, is used for detecting whether the main power supply is abnormal or not, namely whether the under-voltage and under-voltage conditions exist, automatically transfers one or more load circuits from the main power supply to the standby power supply under the condition that the main power supply is abnormal, and automatically transfers one or more load circuits from the standby power supply back to the main power supply after the main power supply is out of order, so that continuous and reliable operation of important loads is ensured. The ATS automatic conversion has the advantages of rapidness and convenience, and the conversion time is generally 0.1-2 seconds.
As shown in fig. 2, a schematic circuit structure of a power supply circuit according to an embodiment of the present application is provided, the structure of the voltage compensation unit 104 is further defined in this embodiment, and the voltage compensation unit 104 includes: primary coil L1, secondary coil L2, inverter 1041, dc energy storage module 1042; the positive output end and the negative output end of the direct current energy storage module 1042 are respectively connected with the positive input end and the negative input end of the inverter 1041, and the positive output end and the negative output end of the inverter 1041 are respectively connected with the two ends of the primary coil L1; two ends of the secondary coil L2 are respectively used as a first end of the voltage compensation unit 104 and a second end of the voltage compensation unit 104, namely, the secondary coil L2 is arranged between the output end of the power switching unit 101 and the electric equipment 203; the control unit 103 is connected to the control end of the voltage compensation unit 104, specifically: the control unit 103 is connected with the control end of the inverter 1041; the control unit 103 is configured to control the inverter 1041 to convert the direct current of the direct current energy storage module 1042 into alternating current under the condition of abnormal voltage, so as to provide the compensating voltage for the electric device 203.
In this embodiment, by defining the specific structure of the voltage compensation unit 104, the control unit 103 processes and analyzes the grid voltage, and controls the high-frequency turn-on and turn-off of the inverter 1041 through the control unit 103, so as to convert the direct current of the direct current energy storage module 1042 into alternating current, and provide the same-frequency, phase-locked and amplitude-variable compensation voltage to the electric device 203 through the primary coil L1 and the secondary coil L2, wherein the direct current energy storage module 1042 provides necessary power support for the inverter 1041 in the dynamic voltage compensation process; therefore, under the condition that the voltage of the power grid is abnormal, compensation voltage can be provided for the electric equipment 203 in time, the stability of the input voltage of the electric equipment 203 is maintained, the electric equipment 203 can work stably, and the production efficiency is improved.
Specifically, in this embodiment, the primary coil L1 and the secondary coil L2 are used to transfer electric energy to the electric device 203, so that the primary coil L1 and the secondary coil L2 can well isolate the voltage compensation unit 104 from the electric device 203, so that the voltage compensation unit 104 is prevented from interfering with the electric device 203, and the running stability of the electric device 203 is further improved.
Specifically, the capacity of the dc energy storage module 1042 depends on the power of the electric device 203 and the switching time Δt of the power switching unit 101, the switching time Δt is generally set to 150 ms-3 s mainly to avoid the erroneous switching from the high-voltage side interference, so the capacity of the dc energy storage module 1042 only needs to support the required power in the switching time, the required capacity is small, generally about 20% of the electric device, and the setting cost is low.
In other embodiments, the voltage compensation unit 104 may have other structures, for example, the voltage compensation unit 104 may be a structure formed by a correction energy storage module and a bypass, and the above requirements may be also met, that is, the control unit detects a voltage drop or an instant interruption at the output end of the power switching unit, and may control the bypass switch to open, correct the operation of the energy storage module, superimpose an appropriate compensation voltage on the grid voltage, and provide an approximate operation voltage for the electric device.
In one embodiment, the primary coil L1, the secondary coil L2 are provided by a transformer or a reactor. Specifically, the primary coil L1 and the secondary coil L2 may be part of a transformer or part of a reactor, and the transformer and the reactor can both provide the primary coil L1 and the secondary coil L2 shown in fig. 2, so as to realize the same function, so that the primary coil L1 and the secondary coil L2 of the embodiment may be integrated in one device, and the integration level is improved.
In one embodiment, inverter 1041 is a rectifying inverter; under the condition of abnormal voltage, the rectifying inverter converts the direct current of the direct current energy storage module 1042 into alternating current so as to provide compensation voltage for the electric equipment 203; the rectifier inverter converts the ac power of the primary coil L1 into dc power to charge the dc energy storage module 1042 under the condition of normal voltage.
Specifically, in this embodiment, when the voltage at the output end of the power switching unit 101 is normal, the voltage is input from the secondary coil L2 to the electric device, in this process, the secondary coil L2 may transmit part of the electric energy to the inverter 1041 through the primary coil L1, and since the inverter 1041 is a rectifying inverter, the control unit 103 does not need to control the control end of the inverter 1041 at this time, the inverter 1041 can implement the rectifying function, and the ac power transmitted by the primary coil L1 may be converted into dc power for charging the dc energy storage module 1042, and the dc energy storage module 1042 stores the electric energy in preparation for the next voltage compensation.
In this embodiment, when the voltage at the output end of the power switching unit 101 is abnormal, the voltage detecting unit 102 detects the voltage at the output end of the power switching unit 101 and sends the detected voltage to the control unit 103, and the control unit 103 can determine that the voltage is abnormal through internal operation, at this time, the control unit 103 controls the control end of the inverter 1041, so that the inverter 1041 is used as an inverter, converts the direct current of the direct current energy storage module 1042 into alternating current, and provides the compensation voltage to the electric equipment 203 through the primary coil L1 and the secondary coil L2.
In one embodiment, the rectifier inverter is a voltage source inverter (VSI, voltage Source Inverter). The voltage source inverter VSI of the present embodiment may be a single-phase half-bridge voltage source inverter or a three-phase full-bridge voltage source inverter.
As shown in fig. 3, a schematic circuit diagram of a power supply circuit according to an embodiment of the application is shown, in this embodiment, the voltage compensation unit 104 further includes a filter 1043; the filter 1043 is provided between the inverter 1041 and the primary coil L1.
Specifically, the inverter 1041 receives the compensation command from the control unit 103, and then, emits a high-frequency PWM wave at a speed of less than 1ms, and since the inverter 1041 cannot generate a pure sine wave and can obtain an approximate sine wave only by the width of the pulse, the present embodiment provides a filter 1043 between the inverter 1041 and the primary coil L1, and filters out the higher-order odd harmonics by using the filter 1043 to obtain a fundamental wave, that is, a desired sine wave. Then, the voltage is injected into the power grid through the primary coil L1 and the secondary coil L2, and ideal voltage is provided for the electric equipment 203.
As shown in fig. 4, a schematic circuit diagram of a power supply circuit according to an embodiment of the application is shown, in which the voltage compensation unit 104 further includes a dc supporting capacitor C; the two ends of the direct current support capacitor C are respectively connected with the positive output end and the negative output end of the direct current energy storage module 1042. In this embodiment, the dc supporting capacitor C is used to improve the stability of the output voltage of the dc energy storage module 1042, so that the inverter 1041 can provide a stable compensation voltage.
Another aspect of the embodiment of the present application further provides a circuit board assembly, including: the power supply circuit of any of the above embodiments.
It is to be noted that the present embodiment is a circuit board assembly embodiment corresponding to a circuit embodiment, and the present embodiment can be implemented in cooperation with the circuit embodiment. The related technical details mentioned in the circuit embodiment are still valid in this embodiment, and are not repeated here for reducing repetition. Accordingly, the related technical details mentioned in the present embodiment can also be applied to the circuit embodiment.
In addition, in order to highlight the innovative part of the present application, units less closely related to solving the technical problem presented by the present application are not introduced in the present embodiment, but it does not indicate that other units are not present in the present embodiment.
Another aspect of the embodiment of the present application further provides an electronic device, including: the circuit board assembly of the above embodiment.
The above division of various components is only for clarity of description, and it is within the protection scope of the present patent to combine one component or split some components into multiple components in implementation, so long as the same logic relationship is included.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples of carrying out the application and that various changes in form and details may be made therein without departing from the spirit and scope of the application.
Claims (10)
1. A power supply circuit, comprising: the device comprises a power supply switching unit, a voltage detection unit, a control unit and a voltage compensation unit;
the two input ends of the power supply switching unit are respectively connected with a main power supply and a standby power supply, the output end of the power supply switching unit is connected with the first end of the voltage compensation unit, and the second end of the voltage compensation unit is connected with electric equipment;
The first end of the voltage detection unit is connected with the output end of the power supply switching unit, the second end of the voltage detection unit is connected with the control unit, and the control unit is also connected with the control end of the voltage compensation unit;
The voltage detection unit is used for detecting the voltage of the output end of the power supply switching unit in real time;
the control unit is used for controlling the voltage compensation unit to provide compensation voltage for the electric equipment under the condition of abnormal voltage.
2. The power supply circuit according to claim 1, wherein the voltage compensation unit includes: the device comprises a primary coil, a secondary coil, an inverter and a direct current energy storage module;
the positive output end and the negative output end of the direct current energy storage module are respectively connected with the positive input end and the negative input end of the inverter, and the positive output end and the negative output end of the inverter are respectively connected with the two ends of the primary coil; two ends of the secondary coil are respectively used as a first end of the voltage compensation unit and a second end of the voltage compensation unit;
The control unit is connected with the control end of the voltage compensation unit, and specifically comprises: the control unit is connected with the control end of the inverter;
The control unit is used for controlling the inverter to convert direct current of the direct current energy storage module into alternating current under the condition of abnormal voltage so as to provide the compensation voltage for the electric equipment.
3. The power supply circuit of claim 2, wherein the inverter is a rectifying inverter; the rectification inverter converts direct current of the direct current energy storage module into alternating current under the condition that the voltage is abnormal so as to provide the compensation voltage for the electric equipment; and under the condition that the voltage is normal, the rectification inverter converts the alternating current of the primary coil into direct current so as to charge the direct current energy storage module.
4. A power supply circuit according to claim 2 or 3, wherein the voltage compensation unit further comprises a filter;
The filter is disposed between the inverter and the primary coil.
5. The power supply circuit of claim 2, wherein the voltage compensation unit further comprises a dc support capacitor;
And two ends of the direct current support capacitor are respectively connected with a positive output end and a negative output end of the direct current energy storage module.
6. The power supply circuit of claim 1, wherein the power switching unit is a dual power automatic transfer switch.
7. A power supply circuit according to claim 3, wherein the rectifying inverter is a voltage source inverter.
8. The power supply circuit of claim 2, wherein the primary coil, secondary coil are provided by a transformer or a reactor.
9. A circuit board assembly comprising the power supply circuit of any one of claims 1-8.
10. An electronic device comprising the circuit board assembly of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322435649.3U CN220964393U (en) | 2023-09-07 | 2023-09-07 | Power supply circuit, circuit board assembly and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322435649.3U CN220964393U (en) | 2023-09-07 | 2023-09-07 | Power supply circuit, circuit board assembly and electronic equipment |
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| Publication Number | Publication Date |
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| CN220964393U true CN220964393U (en) | 2024-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202322435649.3U Active CN220964393U (en) | 2023-09-07 | 2023-09-07 | Power supply circuit, circuit board assembly and electronic equipment |
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| Country | Link |
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| CN (1) | CN220964393U (en) |
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2023
- 2023-09-07 CN CN202322435649.3U patent/CN220964393U/en active Active
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