CN216649315U - Power supply circuit - Google Patents
Power supply circuit Download PDFInfo
- Publication number
- CN216649315U CN216649315U CN202123263289.0U CN202123263289U CN216649315U CN 216649315 U CN216649315 U CN 216649315U CN 202123263289 U CN202123263289 U CN 202123263289U CN 216649315 U CN216649315 U CN 216649315U
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- circuit
- resistor
- power supply
- switch
- switch circuit
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 27
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 27
- 238000002955 isolation Methods 0.000 claims abstract description 19
- 230000005669 field effect Effects 0.000 claims description 33
- 235000014676 Phragmites communis Nutrition 0.000 claims description 14
- 230000006872 improvement Effects 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Direct Current Feeding And Distribution (AREA)
- Stand-By Power Supply Arrangements (AREA)
Abstract
The utility model discloses a power supply circuit, which comprises a power supply seat, an isolation circuit, a first switch circuit, a second switch circuit, a lithium battery and a booster circuit, wherein the isolation circuit is connected with the power supply seat; the isolation circuit is connected with the power supply seat; one end of the first switch circuit is connected with the booster circuit and the second switch circuit, and the other end of the first switch circuit is connected with the power socket and the lithium battery; one end of the second switch circuit is connected with the power supply seat, and the other end of the second switch circuit is connected with the booster circuit and the first switch circuit. According to the power supply circuit, the power supply mode can be automatically switched, the power is supplied by the external power supply when the external power supply is connected, the power is supplied by the lithium battery when the external power supply is not connected, the circuit structure is simple, and the cost is low.
Description
Technical Field
The utility model relates to the field of electronic circuits, in particular to a power supply circuit.
Background
In order to make electronic equipment portable, more and more electronic equipment are provided with lithium batteries, and power can be supplied in a lithium battery or external power supply mode, so that the electronic equipment is convenient for users to use. At present, when the electronic equipment is externally connected with a power supply in the using process, the lithium battery also continuously works, and the service life of the lithium battery is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a low-cost power supply circuit capable of automatically switching power supply modes.
The utility model is realized by the following technical scheme: the power supply circuit comprises a power supply seat, an isolation circuit, a first switch circuit, a second switch circuit, a lithium battery and a booster circuit; the isolation circuit is connected with the power socket; one end of the first switch circuit is connected with the booster circuit and the second switch circuit, and the other end of the first switch circuit is connected with the power socket and the lithium battery; one end of the second switch circuit is connected with the power supply seat, and the other end of the second switch circuit is connected with the booster circuit and the first switch circuit.
As a further improvement of the above technical solution, the power socket includes a power input interface and a switch reed; one end of the power input interface is used for being connected with an external power supply, and the other end of the power input interface is connected with the isolation circuit and the second switch circuit; one end of the switch reed is grounded, and the other end of the switch reed is connected with the first switch circuit.
As a further improvement of the above technical solution, the first switch circuit includes a field effect transistor Q1 and a resistor R1; the grid electrode of the field effect transistor Q1 is connected with the resistor R1 and the switch reed, the source electrode is connected with the lithium battery and the resistor R1, and the drain electrode is connected with the boosting circuit and the second switch circuit.
As a further improvement of the above technical solution, the second switch circuit includes a field effect transistor Q2, a resistor R2, a resistor R3, and a resistor R4; the grid electrode of the field effect transistor Q2 is connected with the resistor R2 and the resistor R3, the source electrode is grounded, and the drain electrode is connected with the resistor R4 and the booster circuit; one end of the resistor R2 is grounded, and the other end of the resistor R3 is connected with the grid of the field effect transistor Q2; one end of the resistor R3 is connected with the power input interface and the isolation circuit, and the other end is connected with the resistor R2 and the grid of the field effect transistor Q2; one end of the resistor R4 is connected with the first switch circuit, and the other end is connected with the drain electrode of the field effect transistor Q2 and the booster circuit.
As a further improvement of the above technical solution, the boost circuit includes a boost chip, and the boost chip includes a boost input interface and a switch control interface; the boost input interface is connected with the first switch circuit, and the switch control interface is connected with the second switch circuit.
As a further improvement of the above technical solution, the isolation circuit includes a diode D1; the anode of the diode D1 is connected to the power input interface and the second switching circuit.
The beneficial effects of the utility model at least comprise: in the power supply circuit, the power supply mode can be automatically switched, the power is supplied by the external power supply when the external power supply is accessed, and the power is supplied by the lithium battery when the external power supply is not accessed, so that the circuit structure is simple, and the cost is low.
Drawings
FIG. 1 is a system block diagram of a power supply circuit according to one embodiment of the utility model;
fig. 2 is a circuit schematic of a power supply circuit according to one embodiment of the utility model.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the power supply circuit includes a power socket 100, an isolation circuit 600, a first switch circuit 200, a second switch circuit 300, a lithium battery 400 and a voltage boost circuit 500; the isolation circuit 600 is connected to the power socket 100; one end of the first switch circuit 200 is connected to the boost circuit 500 and the second switch circuit 300, and the other end is connected to the power socket 100 and the lithium battery 400; the second switch circuit 300 has one end connected to the power socket 100 and the other end connected to the boost circuit 500 and the first switch circuit 200.
As shown in fig. 2, the power socket 100 includes a power input interface and a switch reed; one end of the power input interface is used for connecting with an external power supply, and the other end of the power input interface is connected with the isolation circuit 600 and the second switch circuit 300; one end of the switch reed is grounded, and the other end is connected to the first switch circuit 200. When the power adapter is inserted into the power socket 100, the power adapter is connected to the power input interface, and the switch spring is turned off, so that the first switch circuit 200 is disconnected from the ground. When the power adapter is pulled out of the power socket 100, the switch reed is connected, and the first switch circuit 200 is connected to the ground.
The first switching circuit 200 comprises a field effect transistor Q1 and a resistor R1; the gate of the fet Q1 is connected to the resistor R1 and the switch reed, the source is connected to the lithium battery 400 and the resistor R1, and the drain is connected to the boost circuit 500 and the second switch circuit 300.
In this embodiment, the fet Q1 is a PMOS transistor. When the power socket 100 is connected with an external power supply, the switch reed is disconnected, so that the resistor R1 is disconnected from the ground, the resistor R1 is used as a pull-up resistor, the grid of the field effect transistor Q1 receives a high-level signal, the field effect transistor Q1 is cut off, and the equipment is powered by the external power supply.
When the power socket 100 is not connected with an external power supply, the switch reed is connected to connect the resistor R1 with the ground, the resistor R1 is used as a pull-down resistor, the grid of the field-effect transistor Q1 receives a low-level signal, the field-effect transistor Q1 is connected, and the voltage of the lithium battery 400 is boosted through the boosting circuit 500 to supply power to the equipment.
The second switch circuit 300 comprises a field effect transistor Q2, a resistor R2, a resistor R3 and a resistor R4; the grid electrode of the field effect transistor Q2 is connected with the resistor R2 and the resistor R3, the source electrode is grounded, and the drain electrode is connected with the resistor R4 and the booster circuit 500; one end of the resistor R2 is grounded, and the other end of the resistor R3 is connected with the grid of the field effect transistor Q2; one end of the resistor R3 is connected with the power input interface and the isolation circuit 600, and the other end is connected with the resistor R2 and the grid of the field effect transistor Q2; the resistor R4 has one end connected to the first switch circuit 200 and the other end connected to the drain of the fet Q2 and the boost circuit 500.
In this embodiment, the fet Q2 is an NMOS transistor. When the power socket 100 is connected with an external power supply, the voltage of the external power supply is divided by the resistor R2 and the resistor R3 through the power input interface and then transmitted to the gate of the field effect transistor Q2, the field effect transistor Q2 is connected to the ground, and the booster circuit 500 acquires a low level signal.
When the power socket 100 is not connected to an external power supply, no electric signal is transmitted to the gate of the field effect transistor Q2, the field effect transistor Q2 is turned off, the field effect transistor Q1 is in an on state, the voltage of the lithium battery 400 is transmitted to the resistor R4 through the field effect transistor Q1, the resistor R4 is used as a pull-up resistor, and the boost circuit 500 obtains a high level signal.
The boosting circuit 500 comprises a boosting chip U1, and the boosting chip U1 comprises a boosting input interface and a switch control interface; the boost input interface is connected to the first switching circuit 200, and the switching control interface is connected to the second switching circuit 300. Specifically, the boost input interface is connected to the drain of the fet Q1, and the switch control interface is connected to the resistor R4 and the drain of the fet Q2.
When the power socket 100 is not connected with an external power supply: the field effect transistor Q1 is turned on, and the voltage of the lithium battery 400 is transmitted to the boost input interface through the first switch circuit 200; meanwhile, the field effect transistor Q2 is turned off, the switch control interface acquires a high level signal, the boost chip U1 starts to work, and the voltage of the lithium battery 400 is boosted to supply power to the equipment.
When the power socket 100 is connected with an external power supply: the field effect transistor Q1 is turned off, and the lithium battery 400 stops working; meanwhile, the field effect transistor Q2 is conducted, the switch control interface acquires a low level signal, the boosting chip U1 stops working, and the equipment supplies power through an external power supply.
Referring to fig. 2, the boost circuit 500 further includes a peripheral operating circuit of the boost chip U1, the electrical signal sent by the second switch circuit 300 is transmitted to the boost chip U1 through the pin 11 of the boost chip U1, and the first switch circuit 200 is connected to the peripheral operating circuit. The boost chip U1 stops working when acquiring a high level signal, the boost chip U1 starts working when acquiring a low level signal, and the boost circuit 500 boosts the voltage of the lithium battery 400 and supplies power to equipment.
It is understood that different models of the boost chip U1 can be used according to different devices or designs, and therefore, the peripheral operating circuit of the boost chip U1 needs to be modified accordingly. The second switch circuit 300 is used to control the operating state of the boost chip U1, and the fet Q2 may be replaced by a PMOS transistor according to the control mode of the boost chip U1, for example, when a high level is required to start operation and a low level is required to stop operation.
The boost input interface is connected to the first switch circuit 200, and is configured to receive the voltage transmitted from the lithium battery 400, boost the voltage by the boost circuit 500, and supply power to the device; the switch control interface is connected to the second switch circuit 300, and is configured to receive an electrical signal of the second switch circuit 300 and change a working state according to the corresponding electrical signal. According to the boost chip U1 with different models, the boost input interface and the switch control interface may be pins of the boost chip U1, or may be peripheral circuits of the boost chip U1, which is not limited herein.
The isolation circuit 600 includes a diode D1; the anode of the diode D1 is connected to the power input interface and the second switching circuit 300. The cathode of the diode D1 is connected to the load of the device, and the isolation circuit 600 isolates the load of the device from the power input interface and the second switch circuit 300 through the diode D1, so as to prevent the supply current from being transmitted to the second switch circuit 300, which results in the second switch circuit 300 operating abnormally. The reverse breakdown voltage of the diode D1 is greater than the voltage of the supply current.
The beneficial effects of the utility model at least comprise: the power supply mode can be automatically switched, the power is supplied by the external power supply when the external power supply is accessed, the power is supplied by the lithium battery 400 when the external power supply is not accessed, the circuit structure is simple, and the cost is low. Through the operating condition of first switch circuit 200 and second switch circuit 300 control lithium cell 400 and boost chip U1, when inserting external power source, lithium cell 400 stops the power supply, has ensured the life of battery, and boost chip U1 stop work simultaneously prevents that boost chip U1 from working for a long time and leading to the high temperature and damage.
In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined by the claims and their equivalents.
Claims (6)
1. A power supply circuit is characterized by comprising a power supply base, an isolation circuit, a first switch circuit, a second switch circuit, a lithium battery and a booster circuit; the isolation circuit is connected with the power socket; one end of the first switch circuit is connected with the booster circuit and the second switch circuit, and the other end of the first switch circuit is connected with the power socket and the lithium battery; one end of the second switch circuit is connected with the power supply seat, and the other end of the second switch circuit is connected with the booster circuit and the first switch circuit.
2. The power supply circuit of claim 1, wherein the power socket comprises a power input interface and a switch reed; one end of the power input interface is used for being connected with an external power supply, and the other end of the power input interface is connected with the isolation circuit and the second switch circuit; one end of the switch reed is grounded, and the other end of the switch reed is connected with the first switch circuit.
3. The power supply circuit of claim 2, wherein the first switching circuit comprises a field effect transistor Q1 and a resistor R1; the grid electrode of the field effect transistor Q1 is connected with the resistor R1 and the switch reed, the source electrode is connected with the lithium battery and the resistor R1, and the drain electrode is connected with the boosting circuit and the second switch circuit.
4. The power supply circuit of claim 2, wherein the second switching circuit comprises a field effect transistor Q2, a resistor R2, a resistor R3, and a resistor R4; the grid electrode of the field effect transistor Q2 is connected with the resistor R2 and the resistor R3, the source electrode is grounded, and the drain electrode is connected with the resistor R4 and the booster circuit; one end of the resistor R2 is grounded, and the other end of the resistor R3 is connected with the grid of the field effect transistor Q2; one end of the resistor R3 is connected with the power input interface and the isolation circuit, and the other end is connected with the resistor R2 and the grid of the field effect transistor Q2; one end of the resistor R4 is connected with the first switch circuit, and the other end is connected with the drain electrode of the field effect transistor Q2 and the booster circuit.
5. The power supply circuit of claim 1, wherein the boost circuit comprises a boost chip, the boost chip comprising a boost input interface and a switch control interface; the boost input interface is connected with the first switch circuit, and the switch control interface is connected with the second switch circuit.
6. The power supply circuit of claim 2, wherein the isolation circuit comprises a diode D1; the anode of the diode D1 is connected to the power input interface and the second switching circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123263289.0U CN216649315U (en) | 2021-12-23 | 2021-12-23 | Power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123263289.0U CN216649315U (en) | 2021-12-23 | 2021-12-23 | Power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216649315U true CN216649315U (en) | 2022-05-31 |
Family
ID=81743926
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123263289.0U Active CN216649315U (en) | 2021-12-23 | 2021-12-23 | Power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216649315U (en) |
-
2021
- 2021-12-23 CN CN202123263289.0U patent/CN216649315U/en active Active
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