CN210225033U - Switching circuit for charging circuit - Google Patents
Switching circuit for charging circuit Download PDFInfo
- Publication number
- CN210225033U CN210225033U CN201921646462.5U CN201921646462U CN210225033U CN 210225033 U CN210225033 U CN 210225033U CN 201921646462 U CN201921646462 U CN 201921646462U CN 210225033 U CN210225033 U CN 210225033U
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- resistor
- battery
- power supply
- electronic switch
- external power
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model discloses a switching circuit for charging circuit, including charge management circuit, battery and electronic switch, electronic switch and battery series connection, the electronic switch drive end is connected with external power supply input, charge management circuit charge output and battery are anodal to be connected, when not inserting external power supply, battery drive electronic switch switches on and begins the power supply, after inserting external power supply, power drive electronic switch ends, the battery begins to charge and stops the power supply. The utility model provides a switching circuit for charging circuit, when external power source charges, the automatic disconnection battery is connected with the load.
Description
Technical Field
The utility model relates to a battery charging technology field, specifically speaking relates to a switching circuit for charging circuit.
Background
When the built-in battery of the illuminating lamp in the existing market is charged, the battery cannot be disconnected for supplying power, and the battery charging circuit supply power to a load together. This can easily lead to a long-term under-charge of the battery, increase in the charging time, or failure to fully charge the battery when the load is discharged. The existing illuminating lamp is generally powered off by a manual shifting piece switch, and the shifting piece switch is high in cost, troublesome in production and processing and easy to damage.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a switching circuit for charging circuit, when external power source charges, the automatic disconnection battery is connected with the load.
The utility model discloses a technical scheme that is used for charging circuit's switching circuit to adopt is:
the utility model provides a switching circuit for charging circuit, includes charge management circuit, battery and electronic switch, electronic switch establishes ties with the battery, the electronic switch drive end is connected with external power supply input, charge management circuit charge output and battery positive pole are connected, when not inserting external power supply, battery drive electronic switch switches on and begins the power supply, after inserting external power supply, power drive electronic switch ends, the battery begins to charge and stops the power supply.
Preferably, the electronic switch comprises a PNP triode Q1, a resistor R1 and a resistor R2, an emitter of the triode Q1 is connected with the positive electrode of the battery, a collector of the triode Q1 is used for being connected with a load, a base of the triode Q1 is connected with one end of a resistor R1 and one end of a resistor R2, the other end of the resistor R1 is connected with an input end of an external power supply, and the other end of the resistor R2 is grounded.
Preferably, the device further comprises an NPN triode Q3, a resistor R4 and a resistor R5, wherein a collector of the triode Q3 is connected with a driving end of an electronic switch, an emitter of the triode Q3 is grounded, a base of the triode Q3 is connected with one end of a resistor R4 and one end of a resistor R5, the other end of the resistor R4 is connected with an input end of an external power supply, and the other end of the resistor R5 is grounded;
the electronic switch comprises an NPN triode Q2 and a resistor R3, wherein a collector of the triode Q2 is connected with the positive pole of a battery, an emitter of the triode Q2 is used for being connected with a load, a base of the triode Q2 is connected with one end of a resistor R3 and a collector of the triode Q3, and the other end of the resistor R3 is connected with the positive pole of the battery.
Preferably, the power supply further comprises a diode, the anode of the diode is connected with the input end of an external power supply, and the cathode of the diode is used for being connected with a load.
Preferably, the charging management circuit comprises a chip U1 with a model SD5054, a charging output end of the chip U1 is connected with the positive electrode of the battery, and a power supply end of the chip U1 is connected with an external power supply input end.
The utility model discloses a switching circuit for charging circuit's beneficial effect is: because the electronic switch is connected with the battery in series and the external power supply is connected with the driving end of the electronic switch, when the external power supply is not accessed, the battery drives the electronic switch to be conducted and starts to supply power; when the external power supply is connected, the power supply drives the electronic switch to be cut off, and the battery starts to charge and stops supplying power.
Drawings
Fig. 1 is a schematic diagram of a switching circuit for a charging circuit according to the present invention.
Fig. 2 is a schematic diagram of another embodiment of the switching circuit for the charging circuit of the present invention.
Detailed Description
The invention will be further elucidated and described with reference to the following embodiments and drawings in which:
referring to fig. 1, the switching circuit for the charging circuit includes a charging management circuit, a battery and an electronic switch. The electronic switch is connected with the battery in series, the driving end of the electronic switch is connected with the input end of an external power supply, and the charging output end of the charging management circuit is connected with the positive electrode of the battery. When the external power supply is not accessed, the battery drives the electronic switch to be switched on and starts to supply power, and after the external power supply is accessed, the power supply drives the electronic switch to be switched off, and the battery starts to charge and stops supplying power.
The electronic switch comprises a PNP triode Q1, a resistor R1 and a resistor R2. The triode Q1 projecting pole is connected with the battery positive pole, triode Q1 collecting electrode is used for being connected with the load, triode Q1 base is connected with resistance R1 one end and resistance R2 one end, the resistance R1 other end is connected with external power supply input end, the resistance R2 other end ground connection.
The LED lamp also comprises a diode D1, wherein the anode of the diode D1 is connected with an external power supply input end, and the cathode of the diode D1 is used for being connected with a load.
The charge management circuit includes a chip U1 of model SD 5054. The charging output end of the chip U1 is connected with the positive electrode of the battery, and the power supply end of the chip U1 is connected with the input end of an external power supply.
When an external power supply is connected (higher than the voltage of the battery), the input power supply provides a high level for the base electrode of the triode Q1 through the resistor R1, the triode Q1 is cut off, the battery stops supplying power for the load, and the external power supply supplies power for the load through the diode D1. When the external power supply is not connected, the resistor R1 is connected with the input end of the diode D1, the resistor R2 is connected with the negative electrode, the base voltage of the triode Q1 is lower than the emitting electrode, the triode Q1 is conducted to work, and the battery directly supplies power to the load. When the external power supply is carried out, the power supply of the battery is cut off, so that the charging time of the battery is not influenced by the discharge of the load, and the damage of the battery caused by long-time charging due to the discharge of the load during charging can not be caused.
Example two
Referring to fig. 2, the switching circuit for the charging circuit further includes an NPN transistor Q3, a resistor R4, and a resistor R5. The collector of the triode Q3 is connected with the driving end of the electronic switch, the emitter of the triode Q3 is grounded, the base of the triode Q3 is connected with one end of a resistor R4 and one end of a resistor R5, the other end of the resistor R4 is connected with the input end of an external power supply, and the other end of the resistor R5 is grounded;
the electronic switch includes an NPN transistor Q2 and a resistor R3. The triode Q2 collecting electrode is connected with the battery positive pole, triode Q2 projecting pole is used for being connected with the load, triode Q2 base is connected with triode Q3 collecting electrode with resistance R3 one end, the resistance R3 other end is connected with the battery positive pole.
The LED lamp also comprises a diode D2, wherein the anode of the diode D2 is connected with an external power supply input end, and the cathode of the diode D2 is used for being connected with a load.
When an external power supply is connected (the voltage is higher than the base electrode conducting voltage of the triode Q3), the input power supply provides a high level for the base electrode of the triode Q3 through the resistor R4, the triode Q3 is conducted, the base electrode voltage of the triode Q2 is reduced, the triode Q2 is cut off, the battery stops supplying power to the load, and the external power supply supplies power to the load through the diode D2. When the external power supply is not connected, the triode Q3 is cut off, the base electrode of the triode Q2 is provided with high level by the resistor R3, the voltage of the base electrode of the triode Q3 is higher than that of the emitting electrode, the triode Q2 is conducted to work, and the battery directly supplies power to the load. When the external power supply is carried out, the power supply of the battery is cut off, so that the charging time of the battery is not influenced by the discharge of the load, and the damage of the battery caused by long-time charging due to the discharge of the load during charging can not be caused.
It should be finally noted that the above embodiments are only intended to illustrate the technical solutions of the present invention, and not to limit the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention can be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention.
Claims (5)
1. The utility model provides a switching circuit for charging circuit, its characterized in that, includes charge management circuit, battery and electronic switch, electronic switch and battery series connection, the electronic switch drive end is connected with external power supply input, charge management circuit charge output and battery positive pole are connected, and when not inserting external power supply, battery drive electronic switch switches on and begins the power supply, and after inserting external power supply, power drive electronic switch ends, the battery begins to charge and stops the power supply.
2. The switching circuit for a charging circuit of claim 1, wherein said electronic switch comprises a PNP transistor Q1, a resistor R1, and a resistor R2, wherein an emitter of said transistor Q1 is connected to a positive terminal of a battery, a collector of said transistor Q1 is connected to a load, a base of said transistor Q1 is connected to one end of a resistor R1 and one end of a resistor R2, the other end of said resistor R1 is connected to an input terminal of an external power source, and the other end of said resistor R2 is grounded.
3. The switching circuit for a charging circuit according to claim 1, further comprising an NPN transistor Q3, a resistor R4 and a resistor R5, wherein a collector of the transistor Q3 is connected to the driving terminal of the electronic switch, an emitter of the transistor Q3 is grounded, a base of the transistor Q3 is connected to one end of a resistor R4 and one end of a resistor R5, the other end of the resistor R4 is connected to the input terminal of the external power supply, and the other end of the resistor R5 is grounded;
the electronic switch comprises an NPN triode Q2 and a resistor R3, wherein a collector of the triode Q2 is connected with the positive pole of a battery, an emitter of the triode Q2 is used for being connected with a load, a base of the triode Q2 is connected with one end of a resistor R3 and a collector of the triode Q3, and the other end of the resistor R3 is connected with the positive pole of the battery.
4. A switching circuit for a charging circuit according to any one of claims 1 to 3, further comprising a diode, wherein the anode of the diode is connected to the input terminal of the external power source, and the cathode of the diode is used for connecting to the load.
5. A switching circuit for a charging circuit according to any one of claims 1 to 3, characterised in that the charging management circuit comprises a chip U1 of type SD5054, the charging output terminal of the chip U1 being connected to the positive pole of the battery, and the supply terminal of the chip U1 being connected to the input terminal of an external power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921646462.5U CN210225033U (en) | 2019-09-30 | 2019-09-30 | Switching circuit for charging circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921646462.5U CN210225033U (en) | 2019-09-30 | 2019-09-30 | Switching circuit for charging circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210225033U true CN210225033U (en) | 2020-03-31 |
Family
ID=69921002
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921646462.5U Expired - Fee Related CN210225033U (en) | 2019-09-30 | 2019-09-30 | Switching circuit for charging circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210225033U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113331807A (en) * | 2021-06-02 | 2021-09-03 | 华北理工大学 | Portable blood pressure detector |
-
2019
- 2019-09-30 CN CN201921646462.5U patent/CN210225033U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113331807A (en) * | 2021-06-02 | 2021-09-03 | 华北理工大学 | Portable blood pressure detector |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200331 Termination date: 20200930 |