CN217590293U - Lithium battery power supply circuit - Google Patents
Lithium battery power supply circuit Download PDFInfo
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- CN217590293U CN217590293U CN202220254449.0U CN202220254449U CN217590293U CN 217590293 U CN217590293 U CN 217590293U CN 202220254449 U CN202220254449 U CN 202220254449U CN 217590293 U CN217590293 U CN 217590293U
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- lithium battery
- usb interface
- power supply
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Abstract
The utility model relates to a lithium battery power supply technical field, in particular to lithium battery supply circuit, including the USB interface, the lithium cell, diode D1 and diode D2, the first port of USB interface is connected with diode D1's positive pole electricity, diode D1's negative pole is connected with diode D2's negative pole and the VCC end electricity of the MCU module of peripheral hardware respectively, the second port ground connection of USB interface, diode D2's positive pole is connected with the lithium cell electricity, the problem that can not normally work and the LED drive module of back level can not correctly indicate system operating condition because of the driving voltage is not enough can not appear because of the power supply in the MCU module has been solved like this.
Description
Technical Field
The utility model relates to a lithium battery power supply technical field, in particular to lithium battery power supply circuit.
Background
The traditional lithium battery power supply intelligent electronic product system status indicator lamp mostly adopts LEDs, the forward voltage of a common LED lamp is between 2.8V and 3.2V, the output voltage fluctuation of a lithium battery in the discharging process is very large, and the low lithium battery voltage can be generated, so that the MCU module can not work normally due to insufficient power supply.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model aims to solve the technical problems that: the utility model provides a lithium battery power supply circuit, solve because of the lithium cell voltage crosses lowly and leads to the condition that MCU module undervoltage can not normally work.
In order to solve the technical problem, the utility model discloses a technical scheme be:
the utility model provides a lithium battery supply circuit, includes USB interface, lithium cell, diode D1 and diode D2, the first port of USB interface is connected with diode D1's positive pole electricity, diode D1's negative pole is connected with diode D2's negative pole and the VCC end electricity of the MCU module of peripheral hardware respectively, the second port ground connection of USB interface, diode D2's positive pole and lithium cell electricity are connected.
Furthermore, the device further comprises a capacitor C5, one end of the capacitor C5 is respectively electrically connected with the cathode of the diode D1 and the cathode of the diode D2, and the other end of the capacitor C5 is grounded.
Further, the USB interface is a Type-C interface.
Further, the over-discharge protection voltage of the lithium battery is less than 2.6V.
Furthermore, the LED driving module is further included, the input end of the LED driving module is electrically connected with the output end of the MCU module, and the output end of the LED driving module is grounded.
The beneficial effects of the utility model reside in that:
by arranging the USB interface, the lithium battery, the diode D1 and the diode D2, the first port of the USB interface is electrically connected with the anode of the diode D1, the cathode of the diode D1 is respectively electrically connected with the cathode of the diode D2 and the VCC end of the peripheral MCU module, the second port of the USB interface is grounded, and the anode of the diode D2 is electrically connected with the lithium battery, so that when the energy of the lithium battery can maintain the normal work of the circuit, the MCU module supplies power, the lithium battery provides VCC through the diode D2, the normal work of the rear-stage LED driving module is ensured, and the working state of the system is accurately reflected; when the lithium battery is recharged after being overdischarged, and the starting voltage of the MCU module cannot be reached or the rear-stage LED driving module cannot be effectively driven to normally work due to undervoltage of the lithium battery, the USB interface can supply power to the VCC pin of the MUC module through the diode D1 so as to maintain normal work of the system and accurately display the state, and therefore the problems that the MCU module cannot normally work due to insufficient power supply and the rear-stage LED driving module cannot correctly indicate the work state of the system due to insufficient driving voltage are solved.
Drawings
Fig. 1 is a schematic circuit diagram of a lithium battery power supply circuit according to the present invention;
description of the reference symbols:
1. a USB interface; 2. an MCU module; 3. and an LED driving module.
Detailed Description
In order to explain the technical content, the objects and the effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
Referring to fig. 1, the technical solution provided by the present invention is:
the utility model provides a lithium battery supply circuit, includes USB interface, lithium cell, diode D1 and diode D2, the first port of USB interface is connected with diode D1's positive pole electricity, diode D1's negative pole is connected with diode D2's negative pole and the VCC end electricity of the MCU module of peripheral hardware respectively, the second port ground connection of USB interface, diode D2's positive pole and lithium cell electricity are connected.
From the above description, the beneficial effects of the present invention are:
by arranging the USB interface, the lithium battery, the diode D1 and the diode D2, the first port of the USB interface is electrically connected with the anode of the diode D1, the cathode of the diode D1 is respectively electrically connected with the cathode of the diode D2 and the VCC end of the peripheral MCU module, the second port of the USB interface is grounded, and the anode of the diode D2 is electrically connected with the lithium battery, so that when the energy of the lithium battery can maintain the normal work of the circuit, the power supply of the MCU module is supplied to the lithium battery, the VCC is provided by the lithium battery through the diode D2, the normal work of the rear-stage LED driving module is ensured, and the working state of the system is accurately reflected; when the lithium battery is charged again after being overdischarged, the starting voltage of the MCU module cannot be reached or the rear-stage LED driving module cannot be effectively driven to normally work due to the undervoltage of the lithium battery, the USB interface can supply power to the VCC pin of the MUC module through the diode D1 so as to maintain the normal work and accurate state display of the system, and therefore the problems that the MCU module cannot normally work due to insufficient power supply and the rear-stage LED driving module cannot correctly indicate the work state of the system due to insufficient driving voltage are solved.
Furthermore, the device further comprises a capacitor C5, wherein one end of the capacitor C5 is respectively connected with the cathode of the diode D1 and the cathode of the diode D2, and the other end of the capacitor C5 is grounded.
As can be seen from the above description, the capacitor C5 is provided to perform a filtering function.
Further, the USB interface is a Type-C interface.
Further, the over-discharge protection voltage of the lithium battery is less than 2.6V.
Furthermore, the LED driving module is further included, the input end of the LED driving module is electrically connected with the output end of the MCU module, and the output end of the LED driving module is grounded.
Application scenarios:
the utility model discloses a lithium battery supply circuit is applicable to not having the over-discharge voltage protection circuit or having the protection of putting but the over-discharge protection voltage sets up the lithium battery supply intelligent electronic product who crosses lowly (< 2.6V) for at the lithium cell end of discharging, when restarting to charge, the problem that can not normally work because of the power supply is not enough can not appear in the MCU module.
Referring to fig. 1, a first embodiment of the present invention is:
referring to fig. 1, a power supply circuit for a lithium battery includes a USB interface 1, a lithium battery, a diode D1 (model 1N 4148) and a diode D2 (model 1N 4148), a first port of the USB interface 1 is electrically connected to an anode of the diode D1, a cathode of the diode D1 is electrically connected to a cathode of the diode D2 and a VCC terminal of an external MCU module 2, respectively, a second port of the USB interface 1 is grounded, and an anode of the diode D2 is electrically connected to the lithium battery.
Referring to fig. 1, the display device further includes a capacitor C5, one end of the capacitor C5 is respectively connected to the cathode of the diode D1 and the cathode of the diode D2, and the other end of the capacitor C5 is grounded.
The over-discharge protection voltage of the lithium battery is less than 2.6V.
Referring to fig. 1, the lighting device further includes an LED driving module 3, an input end of the LED driving module 3 is electrically connected to an output end of the MCU module 2, and an output end of the LED driving module 3 is grounded.
Referring to fig. 1, the MCU module 2 includes a chip U1, and a cathode of the diode D1 is electrically connected to a third pin of the chip U1.
Referring to fig. 1, the LED driving module 3 includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a light emitting diode LED1, a light emitting diode LED2, a light emitting diode LED3, and a light emitting diode LED4, wherein one end of the resistor R1 is electrically connected to an eighteenth pin of the chip U1, the other end of the resistor R1 is electrically connected to an anode of the light emitting diode LED1, one end of the resistor R2 is electrically connected to a seventeenth pin of the chip U1, the other end of the resistor R2 is electrically connected to an anode of the light emitting diode LED2, one end of the resistor R3 is electrically connected to a sixteenth pin of the chip U1, the other end of the resistor R3 is electrically connected to an anode of the light emitting diode LED3, one end of the resistor R4 is electrically connected to a fifteenth pin of the chip U1, the other end of the resistor R4 is electrically connected to an anode of the light emitting diode LED5, and a cathode of the light emitting diode LED1 is respectively connected to a cathode of the light emitting diode LED2, a cathode of the light emitting diode LED3, a cathode of the light emitting diode LED1, a cathode of the light emitting diode LED2, a cathode of the light emitting diode LED3, and a cathode of the light emitting diode LED4 are all grounded.
The working principle of the lithium battery power supply circuit is as follows:
when the normal work is carried out:
when the energy of lithium cell can maintain the normal work of circuit, MCU module 2 supplies power and passes through diode D2 by lithium cell (BAT +), then provides the VCC after capacitor C5 filters, guarantees that LED drive module 3 normally works for accurate reflection system operating condition.
When the lithium battery is under-voltage:
when the lithium battery is recharged after overdischarge, and the undervoltage of the lithium battery cannot reach the starting voltage of the MCU module 2 or cannot effectively drive the LED driving module 3 at the rear stage to normally work, the USB interface 1 can supply power to a VCC pin of the MUC module through a diode D1 so as to maintain the normal work and accurate display of the state of the system; at this time, if there is no diode D2 to reversely separate the USB interface 1 from the lithium battery, the voltage of the USB interface 1 is directly applied to the lithium battery through the diode D1, and the current passing through the diode D1 is not constant-current processed, and charging the lithium battery with a non-constant-current power source causes multiple problems:
1) Skipping the system and setting the current charging process, aggravating the molecular activities in the lithium battery, heating the lithium battery, and possibly leading to safety accidents under severe conditions.
2) The current charged without constant current can cause the voltage and current in the lithium battery to fluctuate violently, thus influencing the cycle use times of the lithium battery and reducing the service life.
3) The uncontrollable charging current at the moment of the initial charging stage can bring huge electrical stress to electronic devices, and the failure of the devices can be seriously caused.
In order to avoid the damage to the lithium battery and the electronic device caused by the direct application of the constant current to the lithium battery, the function of the diode D2 is particularly important; when the lithium battery is required to supply power to the MCU module 2, the diode D2 is in a forward conduction state, the lithium battery can supply power to the MCU module 2 through the diode D2, during charging, the USB interface 1 supplies power to the MCU module 2 through the diode D1, at the moment, the USB interface 1 is reversely cut off due to the diode D2, the USB interface 1 cannot be directly applied to the lithium battery through the diode D2, and unnecessary risks are avoided.
To sum up, the utility model provides a lithium battery power supply circuit, through setting up the USB interface, the lithium cell, diode D1 and diode D2, the first port of USB interface is connected with diode D1's positive pole electricity, diode D1's negative pole respectively with diode D2's negative pole and the VCC end electricity of the MCU module of peripheral hardware connect, the second port ground connection of USB interface, diode D2's positive pole and lithium cell electricity are connected, so that when the energy of lithium cell can maintain circuit normal work, the MCU module supplies power and is provided VCC by the lithium cell through diode D2, guarantee that the LED drive module of back level normally works, be used for accurately reflecting system operating condition; when the lithium battery is recharged after being overdischarged, and the starting voltage of the MCU module cannot be reached or the rear-stage LED driving module cannot be effectively driven to normally work due to undervoltage of the lithium battery, the USB interface can supply power to the VCC pin of the MUC module through the diode D1 so as to maintain normal work of the system and accurately display the state, and therefore the problems that the MCU module cannot normally work due to insufficient power supply and the rear-stage LED driving module cannot correctly indicate the work state of the system due to insufficient driving voltage are solved.
The above mentioned is only the embodiment of the present invention, and not the limitation of the patent scope of the present invention, all the equivalent transformations made by the contents of the specification and the drawings, or the direct or indirect application in the related technical field, are included in the patent protection scope of the present invention.
Claims (4)
1. A lithium battery power supply circuit is characterized by comprising a USB interface, a lithium battery, a diode D1 and a diode D2, wherein a first port of the USB interface is electrically connected with an anode of the diode D1, a cathode of the diode D1 is respectively electrically connected with a cathode of the diode D2 and a VCC end of an MCU module arranged outside, a second port of the USB interface is grounded, and an anode of the diode D2 is electrically connected with the lithium battery;
the LED driving module is characterized by further comprising an LED driving module, wherein the input end of the LED driving module is electrically connected with the output end of the MCU module, and the output end of the LED driving module is grounded.
2. The lithium battery power supply circuit according to claim 1, further comprising a capacitor C5, wherein one end of the capacitor C5 is electrically connected to the cathode of the diode D1 and the cathode of the diode D2, respectively, and the other end of the capacitor C5 is grounded.
3. The lithium battery power supply circuit of claim 1, wherein the USB interface is a Type-C interface.
4. The lithium battery supply circuit of claim 1, wherein the over-discharge protection voltage of the lithium battery is less than 2.6V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220254449.0U CN217590293U (en) | 2022-02-08 | 2022-02-08 | Lithium battery power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220254449.0U CN217590293U (en) | 2022-02-08 | 2022-02-08 | Lithium battery power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217590293U true CN217590293U (en) | 2022-10-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220254449.0U Active CN217590293U (en) | 2022-02-08 | 2022-02-08 | Lithium battery power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217590293U (en) |
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2022
- 2022-02-08 CN CN202220254449.0U patent/CN217590293U/en active Active
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