CN218216772U - Multi-path direct current power supply circuit - Google Patents
Multi-path direct current power supply circuit Download PDFInfo
- Publication number
- CN218216772U CN218216772U CN202222492617.2U CN202222492617U CN218216772U CN 218216772 U CN218216772 U CN 218216772U CN 202222492617 U CN202222492617 U CN 202222492617U CN 218216772 U CN218216772 U CN 218216772U
- Authority
- CN
- China
- Prior art keywords
- power supply
- electrically connected
- supply unit
- voltage stabilizing
- direct current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The application discloses multichannel direct current supply circuit includes: the multi-path power supply module comprises a USB input interface and a direct current power supply unit electrically connected with the USB input interface, and the USB input interface is used for connecting an external mobile power supply to access electric energy; the direct current power supply unit is connected with an external power supply and used for transmitting the electric energy of the external power supply to the electronic equipment for supplying power; the output end of the direct current power supply unit is electrically connected with a storage battery power supply unit, the storage battery power supply unit is electrically connected with the direct current power supply unit, and the storage battery power supply unit is used for supplying electric energy to the electronic equipment when the direct current power supply unit is disconnected to supply power to the electronic equipment and the USB input interface is not provided with an external mobile power supply; and the input end of the voltage stabilizing module is electrically connected with the multi-path power supply module, and the voltage stabilizing module is used for stably outputting the electric energy output by the multi-path power supply module to the electronic equipment. The method and the device have the effect of effectively facilitating the use of the electronic equipment by people in different occasions.
Description
Technical Field
The application relates to the technical field of power supply, in particular to a multi-path direct-current power supply circuit.
Background
With the rapid development of the electronic industry and the wide application of a large number of electronic devices, more and more electronic devices are provided. The dc power supply circuit is an essential circuit in most electronic devices, and can process an acquired external input voltage and supply power to a load in the electronic device.
At present, along with more and more frequent economic exchange among cities, people have more demands on power supply modes of electronic equipment so as to meet different use occasions in daily life or outdoor travel. In the related art, an electronic device is generally connected to an external power source, so that the electronic device is powered on to operate. However, when the portable electronic device cannot find the external power supply when going out, the portable electronic device does not have a power supply to supply power required by the work to the electronic device, so that the electronic device stops working, and people cannot use the portable electronic device conveniently in different occasions.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defect that when no power supply provides power required by the electronic equipment for working, the electronic equipment stops working, and people are inconvenient to use the electronic equipment in different occasions, the multi-path direct current power supply circuit is provided.
The application provides a multichannel direct current supply circuit adopts following technical scheme:
a multi-channel dc supply circuit comprising:
the multi-path power supply module comprises a USB input interface and a direct current power supply unit electrically connected with the USB input interface, and the USB input interface is used for connecting an external mobile power supply to access electric energy so as to provide the electric energy for the electronic equipment; the direct current power supply unit is connected with an external power supply and used for transmitting electric energy of the external power supply to the electronic equipment for power supply; the output end of the direct current power supply unit is also electrically connected with a storage battery power supply unit, the storage battery power supply unit is electrically connected with the direct current power supply unit, and the storage battery power supply unit is used for supplying electric energy to the electronic equipment when the direct current power supply unit is disconnected to supply power to the electronic equipment and the USB input interface does not have an external mobile power supply;
the input end of the voltage stabilizing module is electrically connected with the multi-path power supply module, and the voltage stabilizing module is used for stably outputting the electric energy output by the multi-path power supply module to the electronic equipment.
By adopting the technical scheme, when the electronic equipment needs to be plugged for work, people can access the electric energy transformed by the transformation unit through the direct current power supply unit according to the requirements of different occasions, so that the power is supplied to the electronic equipment. Meanwhile, the direct current power supply unit provides electric energy to the storage battery power supply unit, so that the storage battery is charged. When the direct current power supply unit is disconnected to supply power to the electronic equipment, the external mobile power supply can be connected to supply power through the USB input interface. When the direct current power supply unit is disconnected to supply power to the electronic equipment and the USB input interface is not provided with an external mobile power supply, the storage battery discharges, and at the moment, the storage battery supplies electric energy to the electronic equipment so as to maintain the work of the electronic equipment, thereby effectively facilitating the use of the electronic equipment by people in different occasions.
Preferably, the dc power supply unit includes a rectifying portion for converting an input ac power into a dc power and a filtering portion for filtering a rectified electric energy, an output end of the rectifying portion is electrically connected to an input end of the filtering portion, and an output end of the filtering portion is electrically connected to an input end of the voltage stabilizing module.
By adopting the technical scheme, when the direct current power supply unit supplies power to the electronic equipment, alternating current transformed by the transformation unit is rectified by the rectification part, and is filtered by the filtering part, so that the filtered direct current is output to the voltage stabilizing module.
Preferably, the storage battery power supply unit includes a charging chip IC1 and a storage battery, a VCC pin of the charging chip IC1 is electrically connected to an output end of the rectifying portion, a BAT pin of the charging chip IC1 is electrically connected to a positive electrode of the storage battery, and a positive electrode of the storage battery is electrically connected to an input end of the voltage stabilizing module.
By adopting the technical scheme, when the direct current power supply unit supplies power to the electronic equipment, the direct current power supply unit simultaneously provides electric energy to charge the storage battery. When the direct current power supply unit is disconnected to supply power to the electronic equipment and the USB input interface is not provided with an external mobile power supply, the storage battery power supply module is connected, and at the moment, the storage battery supplies power to the electronic equipment so as to maintain the work of the electronic equipment.
Preferably, the output end of the rectifying part is electrically connected with a switch part for controlling the storage battery power supply unit to supply power to the electronic equipment, and the output end of the switch part is electrically connected with the voltage stabilizing module.
By adopting the technical scheme, when the direct current power supply unit supplies power to the electronic equipment, the direct current power supply unit charges the storage battery through the charging chip and controls the storage battery power supply unit to be disconnected through the switch part to supply power to the electronic equipment. And when the direct current power supply unit is disconnected to supply power to the electronic equipment and the USB input interface has no external mobile power supply, the switch part controls the conduction of the storage battery power supply unit, so that the storage battery provides electric energy for the electronic equipment.
Preferably, the switch unit includes a relay KM electrically connected to the voltage stabilizing module and a normally closed contact switch KM-1 controlled by the relay KM, an anode of the relay KM is electrically connected to an output terminal of the dc power supply unit or the USB input interface, a cathode of the relay is electrically connected to an input terminal of the voltage stabilizing module, an input terminal of the normally closed contact switch KM-1 is electrically connected to an output terminal of the dc power supply unit or the USB input interface, and an output terminal of the normally closed contact switch is electrically connected to an anode of the storage battery.
By adopting the technical scheme, when the direct current power supply unit supplies power to the electronic equipment, the relay KM is electrified and conducted, the normally closed contact switch KM-1 is disconnected, so that the storage battery and the voltage stabilizing module are disconnected, and at the moment, the direct current power supply unit supplies power to the electronic equipment. When the direct current power supply unit is disconnected to supply power to the electronic equipment and the USB input interface has no external mobile power supply, the relay KM is powered off, the normally closed contact switch KM-1 is kept in a closed state, the storage battery power supply unit is connected, and at the moment, the storage battery supplies power to the electronic equipment.
Preferably, the voltage stabilizing module includes a voltage stabilizing chip IC2 and a peripheral standard circuit of the voltage stabilizing chip IC2, an input pin of the voltage stabilizing chip IC2 is electrically connected to an output end of the multi-path power supply module, an output pin of the voltage stabilizing chip IC2 is electrically connected to a first output port, a voltage adjusting pin of the voltage stabilizing chip IC2 is electrically connected to an adjustable resistor RP1, an anode of the adjustable resistor RP1 is electrically connected to the voltage adjusting pin of the voltage stabilizing chip IC2, and a cathode of the adjustable resistor RP1 is grounded.
By adopting the technical scheme, after people select a power supply mode according to demands, the voltage stabilizing module receives the electric energy output by the multi-path power supply module and outputs the electric energy after stabilizing the voltage.
Preferably, an output pin of the voltage stabilizing chip IC2 is electrically connected to a delay module for receiving the electric energy output by the voltage stabilizing module and delaying the output, and an output end of the delay module is electrically connected to a second output port.
By adopting the technical scheme, after people select the first output port or the second output port according to requirements, the voltage stabilizing module outputs the electric energy to the first output port in a voltage stabilizing manner to supply power to the electronic equipment; or the electric energy is output to the delay module, delayed and then output to the second output port.
Preferably, the delay module includes a delay chip IC3 and a peripheral standard circuit of the delay chip IC3, a voltage input end of the delay chip IC3 is electrically connected to an output end of the voltage stabilizing module, and an output end of the delay chip IC3 is electrically connected to the second output port.
By adopting the technical scheme, the delay chip IC3 delays the electric energy output by the voltage stabilizing module, and outputs the electric energy to the second output port to supply power to the electronic equipment.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the electronic equipment is powered by the direct current power supply unit, the USB input interface or the storage battery power supply unit, so that the electronic equipment is powered on to work, and the electronic equipment is effectively and conveniently used by people in different occasions;
2. by arranging the switch part, when the direct current power supply unit supplies power to the electronic equipment, the switch part controls the storage battery power supply unit to cut off the power supply to the electronic equipment, so that the electronic equipment is supplied with standby power.
Drawings
Fig. 1 is a schematic diagram of an overall circuit structure according to an embodiment of the present application.
Fig. 2 is a schematic circuit structure diagram of a multi-path power supply module in the embodiment of the present application.
Description of the reference numerals:
1. a multi-path power supply module; 11. a DC power supply unit; 111. a rectifying section; 112. a filtering section; 12. a voltage transformation unit; 13. a battery power supply unit; 2. a voltage stabilization module; 3. a delay module; 4. a switch section.
Detailed Description
The present application is described in further detail below with reference to figures 1-2.
Referring to fig. 1, the multi-path dc power supply circuit disclosed in the present application includes a multi-path power supply module 1 and a voltage stabilizing module 2. The multi-path power supply module 1 is electrically connected with the voltage stabilizing module 2 and is used for outputting electric energy to the voltage stabilizing module 2 after the electric energy is accessed; the voltage stabilizing module 2 is used for stably outputting the electric energy output by the multi-path power supply module 1 to the electronic equipment.
Referring to fig. 1 and 2, in particular, the multi-path power supply module 1 includes a USB input interface and a dc power supply unit 11 electrically connected to the USB input interface, where the USB input interface is electrically connected to an input end of the voltage stabilizing module 2, and is configured to be externally connected to a mobile power supply to access electric energy and output the electric energy to the voltage stabilizing module 2, so as to provide electric energy to the electronic device; the direct current power supply unit 11 is connected with an external power supply and used for transmitting electric energy of the external power supply to the electronic equipment for power supply.
Referring to fig. 1 and 2, an input end of the dc power supply unit 11 is electrically connected to a transforming unit 12, and the transforming unit 12 is configured to transform ac power of an external power supply and output the transformed ac power to the dc power supply unit 11. Specifically, the voltage transformation unit includes a transformer for transforming the voltage of the external power supply and outputting the transformed voltage to the dc power supply unit 11, the transformer includes a primary coil and a secondary coil, the primary coil of the transformer is electrically connected to the external power supply, and the secondary coil of the transformer is electrically connected to the input terminal of the dc power supply unit 11.
Referring to fig. 1 and 2, the dc power supply unit 11 includes a rectifying unit 111 and a filtering unit 112 electrically connected to the rectifying unit 111, wherein the rectifying unit 111 is configured to receive the ac power transformed by the transformer and output a dc power, and an input end of the filtering unit 112 is electrically connected to an output end of the rectifying unit 111 and is configured to filter the dc power output by the rectifying unit 111.
Referring to fig. 1 and 2, in particular, the rectifying portion 111 includes a rectifying bridge, an anode input end and a cathode input end of the rectifying bridge are electrically connected to an anode output end and a cathode output end of the secondary coil of the transformer, respectively, the anode output end of the rectifying bridge is electrically connected to the input end of the filtering portion 112, and the cathode output end of the rectifying bridge is grounded. The filter part 112 includes two filter capacitors connected in parallel, and the positive and negative electrodes of the two filter capacitors are electrically connected to the positive output end and the negative output end of the rectifier bridge, respectively. The alternating current is rectified by the rectifier bridge and filtered by two filter capacitors connected in parallel, so that the filtered voltage is output to the voltage stabilizing module 2.
Referring to fig. 1 and 2, the output end of the rectifying portion 111 is further electrically connected to a battery power supply unit 13 and a switch portion 4 for controlling the battery power supply unit 13 to supply power to the electronic device, and the output end of the battery power supply unit 13 is electrically connected to the input end of the voltage stabilizing module 2. When the dc power supply unit 11 is disconnected to supply power to the electronic device and the USB input interface has no external mobile power source, the storage battery power supply unit 13 is configured to supply power to the electronic device.
Specifically, the storage battery power supply unit 13 includes a charging chip IC1, a storage battery, and a peripheral circuit of the charging chip IC1, and the model of the charging chip IC1 is a TP4057 chip. The VCC pin of TP4057 chip and the output electric connection of rectifying part 111, the BAT pin of TP4057 chip and the anodal electric connection of battery, the negative pole ground connection of battery. In addition, the positive electrode of the storage battery is electrically connected to the input end of the voltage stabilizing module 2. When the dc power supply unit 11 supplies power to the electronic device, the dc power supply unit 11 charges the battery through the TP4057 chip, and controls the battery power supply unit 13 to disconnect the power supply to the electronic device through the switch unit 4. And when the direct current power supply unit 11 is disconnected to supply power to the electronic equipment and the USB input interface has no external mobile power supply, the switch part 4 controls the storage battery power supply unit 13 to be switched on, so that the storage battery supplies power to the electronic equipment.
Referring to fig. 1 and 2, the switch portion 4 includes a relay KM electrically connected to the voltage stabilizing module 2 and a normally closed contact switch KM-1 controlled by the relay KM. The positive pole of the relay KM is electrically connected with the output end of the direct current supply unit 11 or the USB input interface, and the negative pole of the relay is electrically connected with the input end of the voltage stabilizing module 2. The input end of the normally closed contact switch KM-1 is electrically connected to the output end of the direct current power supply unit 11 or the USB input interface, and the output end of the normally closed contact switch is electrically connected to the anode of the storage battery. When the direct current power supply unit 11 is powered on, the relay KM is powered on, the normally closed contact switch KM-1 is disconnected, so that the storage battery and the voltage stabilizing module 2 are disconnected, and at the moment, the direct current power supply unit 11 supplies power to the electronic equipment. When the direct current power supply unit 11 is disconnected to supply power to the electronic equipment and the USB input interface has no external mobile power supply, the relay KM is powered off, the normally closed contact switch KM-1 is kept in a closed state, and the storage battery supplies power to the electronic equipment.
Specifically, the voltage stabilizing module 2 mainly includes a voltage stabilizing chip IC2 and a peripheral standard circuit of the voltage stabilizing chip IC2, and the model of the voltage stabilizing chip IC2 is an LM317 chip. The input pin electric connection of LM317 chip has first output port in multichannel power module 1's output, the output pin electric connection of LM317 chip has first output port, first output port and electronic equipment electric connection for export the electric energy of LM317 chip output to electronic equipment, make electronic equipment get electric work. The voltage regulation pin of the LM317 chip is electrically connected with an adjustable resistor RP1 so as to stably output the regulated output voltage.
Referring to fig. 1 and 2, the output pin of the lm317 chip is further electrically connected to a delay module 3, and the delay module 3 is configured to receive the electric energy output by the voltage stabilizing module 2 and delay the electric energy for output. Specifically, the delay module 3 includes a delay chip IC3 and a peripheral standard circuit of the delay chip IC3, and the model of the delay chip IC3 is an NE555 chip. The voltage input end of NE555 chip and voltage stabilizing module 2's output electric connection, NE555 chip's output electric connection has triode Q1, triode Q1 is the NPN triode, triode Q1's base electric connection in NE555 chip's output, triode Q1's collecting electrode electric connection in voltage stabilizing module 2's output, triode Q1's projecting pole electric connection has the second output port, second output port and electronic equipment electric connection for export the electric energy of NE555 chip output to electronic equipment, make electronic equipment work that gets electricity. The arrangement of the first output port and the second output port enables the electric energy of the multi-path power supply module 1 to be output in a double-path mode, and the electronic equipment can select the first output port or the second output port to be connected according to requirements. When the delay module 3 is powered on, the NE555 chip outputs a high level after a set time, so that the triode Q1 is conducted, and the electric energy is transmitted to the second output port. And after the delay time is over, the NE555 chip does not output high level any more, and the triode Q1 is cut off.
The implementation principle of the embodiment of the application is as follows: when the electronic device needs to be plugged, the electronic device is connected to the first output port or the second output port according to the requirement, and the electric energy transformed by the transformation unit 12 can be connected to the electronic device through the direct current power supply unit 11. Meanwhile, the dc power supply unit 11 supplies power to the secondary battery power supply unit 13, thereby charging the secondary battery. When the direct current power supply unit 11 cuts off the power supply to the electronic equipment, the external mobile power supply can be accessed through the USB input interface. When the direct current power supply unit 11 is disconnected to supply power to the electronic equipment and the USB input interface has no external mobile power supply, the storage battery discharges, so that the storage battery provides electric energy for the electronic equipment to maintain the work of the electronic equipment, and the electronic equipment is effectively and conveniently used by people in different occasions.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. A multi-channel dc supply circuit, comprising:
the multi-path power supply module (1), the multi-path power supply module (1) comprises a USB input interface and a direct current power supply unit (11) electrically connected with the USB input interface, and the USB input interface is used for being externally connected with a mobile power supply to access electric energy, so that electric energy is provided for electronic equipment; the direct current power supply unit (11) is connected with an external power supply and used for transmitting the electric energy of the external power supply to the electronic equipment for power supply; the output end of the direct current power supply unit (11) is also electrically connected with a storage battery power supply unit (13), the storage battery power supply unit (13) is electrically connected with the direct current power supply unit (11), and the storage battery power supply unit (13) is used for supplying electric energy to the electronic equipment when the direct current power supply unit (11) is disconnected to supply power to the electronic equipment and the USB input interface is not provided with an external mobile power supply;
the input end of the voltage stabilizing module (2) is electrically connected with the multi-path power supply module (1), and the voltage stabilizing module (2) is used for stably outputting the electric energy output by the multi-path power supply module (1) to the electronic equipment.
2. The multi-channel dc supply circuit of claim 1, wherein: the direct current power supply unit (11) comprises a rectifying part (111) for converting input alternating current into direct current and a filtering part (112) for filtering rectified electric energy, wherein the output end of the rectifying part (111) is electrically connected to the input end of the filtering part (112), and the output end of the filtering part (112) is electrically connected to the input end of the voltage stabilizing module (2).
3. The multi-channel dc supply circuit of claim 2, wherein: the storage battery power supply unit (13) comprises a charging chip IC1 and a storage battery, a VCC pin of the charging chip IC1 is electrically connected with an output end of the rectifying part (111), a BAT pin of the charging chip IC1 is electrically connected with a positive electrode of the storage battery, and a positive electrode of the storage battery is electrically connected with an input end of the voltage stabilizing module (2).
4. The multi-channel dc supply circuit of claim 2, wherein: the output end of the rectifying part (111) is electrically connected with a switch part (4) used for controlling the storage battery power supply unit (13) to supply power to the electronic equipment, and the output end of the switch part (4) is electrically connected with the voltage stabilizing module (2).
5. The multi-channel dc supply circuit of claim 4, wherein: the switch part (4) comprises a relay KM electrically connected with the voltage stabilizing module (2) and a normally closed contact switch KM-1 controlled by the relay KM, the positive electrode of the relay KM is electrically connected with the output end of the direct current power supply unit (11) or the USB input interface, the negative electrode of the relay is electrically connected with the input end of the voltage stabilizing module (2), the input end of the normally closed contact switch KM-1 is electrically connected with the output end of the direct current power supply unit (11) or the USB input interface, and the output end of the normally closed contact switch is electrically connected with the positive electrode of the storage battery.
6. The multi-channel dc supply circuit of claim 1, wherein: the voltage stabilizing module (2) comprises a voltage stabilizing chip IC2 and a peripheral standard circuit of the voltage stabilizing chip IC2, an input pin of the voltage stabilizing chip IC2 is electrically connected to the output end of the multi-path power supply module (1), an output pin of the voltage stabilizing chip IC2 is electrically connected with a first output port, a voltage adjusting pin of the voltage stabilizing chip IC2 is electrically connected with an adjustable resistor RP1, the anode of the adjustable resistor RP1 is electrically connected with the voltage adjusting pin of the voltage stabilizing chip IC2, and the cathode of the adjustable resistor RP1 is grounded.
7. The multi-channel dc supply circuit of claim 6, wherein: the output pin of the voltage stabilizing chip IC2 is electrically connected with a delay module (3) which is used for receiving the electric energy output by the voltage stabilizing module (2) and delaying the output, and the output end of the delay module (3) is electrically connected with a second output port.
8. The multi-channel dc supply circuit of claim 7, wherein: the delay module (3) comprises a delay chip IC3 and a peripheral standard circuit of the delay chip IC3, the voltage input end of the delay chip IC3 is electrically connected with the output end of the voltage stabilizing module (2), and the output end of the delay chip IC3 is electrically connected with the second output port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222492617.2U CN218216772U (en) | 2022-09-21 | 2022-09-21 | Multi-path direct current power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222492617.2U CN218216772U (en) | 2022-09-21 | 2022-09-21 | Multi-path direct current power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218216772U true CN218216772U (en) | 2023-01-03 |
Family
ID=84635615
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222492617.2U Active CN218216772U (en) | 2022-09-21 | 2022-09-21 | Multi-path direct current power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218216772U (en) |
-
2022
- 2022-09-21 CN CN202222492617.2U patent/CN218216772U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN208386212U (en) | A kind of uninterruptible power supply | |
| CN111509825A (en) | 45W broadband voltage self-adaptation PPS super portable power source structure that fills soon | |
| CN107863818B (en) | Intelligent integrated uninterrupted multi-path direct current output switching power supply | |
| CN201797365U (en) | Charger for storage batteries of electric vehicles | |
| CN218216772U (en) | Multi-path direct current power supply circuit | |
| CN102185358A (en) | Simple and practical movable uninterruptible power supply | |
| CN202111492U (en) | Multifunctional charger | |
| CN217741362U (en) | Multifunctional mobile power supply | |
| CN100553070C (en) | A kind of uninterrupted power supply with multiple protection functions | |
| CN206517138U (en) | A kind of power circuit of single-phase intelligent ammeter | |
| CN210273865U (en) | Synchronous rectification circuit of charger | |
| CN211556970U (en) | Auxiliary power supply topology structure of UPS (uninterrupted Power supply) equipment and UPS equipment | |
| CN102709999A (en) | Energy-saving charger | |
| CN217135220U (en) | Power supply circuit of navigation system | |
| CN202712950U (en) | Energy saving charger | |
| CN202524115U (en) | Uninterrupted switch power supply | |
| CN112383127A (en) | Power-expandable modular portable energy storage power supply and control method thereof | |
| CN204928253U (en) | Low -cost energy -conserving charger | |
| CN218633388U (en) | Battery pack charging and discharging management device and system based on super capacitor | |
| CN203119539U (en) | Charger capable of automatically regulating voltages | |
| CN212012459U (en) | Alternating current and direct current power supply switching device | |
| CN210839028U (en) | Backup lithium battery UPS power supply circuit | |
| CN204470764U (en) | Battery-type AC-dc welding machine | |
| CN215870902U (en) | Lithium battery power supply system with linear dynamic charging current-limiting function for communication equipment | |
| CN213637449U (en) | Mobile power supply device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |