CN219643618U - Charging circuit for realizing power path switching - Google Patents
Charging circuit for realizing power path switching Download PDFInfo
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- CN219643618U CN219643618U CN202320228323.0U CN202320228323U CN219643618U CN 219643618 U CN219643618 U CN 219643618U CN 202320228323 U CN202320228323 U CN 202320228323U CN 219643618 U CN219643618 U CN 219643618U
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model belongs to the technical field of charging, and particularly relates to a charging circuit for realizing power path switching. The power module comprises a rechargeable battery and a USB charging port, wherein the rechargeable battery and the USB charging port are both used for providing input voltage for the voltage rectifying module, and the voltage rectifying module obtains USB charging voltage VBUS and voltage rectifying VBAT of the rechargeable battery after voltage rectifying. The USB charging port charges the rechargeable battery through the charging chip. The USB charging voltage regulating voltage VBUS and the rechargeable battery voltage regulating voltage VBAT are applied to the input end of the selection module. The input end of the selection module is connected with the subsequent-stage circuit. The PMOS tube in the selection module isolates the USB charging voltage VBUS from the rechargeable battery voltage VBAT, so that the USB charging port is connected with an external power supply to independently supply power to the rear-stage circuit through the USB charging port, the USB charging port is not connected with the external power supply to independently supply power to the rear-stage circuit through the rechargeable battery, and the stability of power supply is ensured.
Description
Technical Field
The utility model belongs to the technical field of charging, and particularly relates to a charging circuit for realizing power path switching.
Background
Currently, rechargeable batteries and USB charging ports are adopted in many electronic products simultaneously. If the power supply path of the charging circuit of the electronic product is not switched, the charging stability is reduced, and meanwhile, explosion may be caused. The prior art is formed by combining the switching property of a field effect transistor and a Schottky diode. When the USB power supply or an external adapter cannot drive the load, the detection circuit switches the power supply back to the battery, so that the load works normally; when the USB voltage is recovered, the battery power supply is continuously maintained by maintaining the steady-state circuit, so that the normal operation of the load is ensured. The prior art works with USB based voltages higher than the battery voltage. When the voltage of the USB is unstable and even lower than the battery voltage or the battery voltage is higher, the battery voltage is conducted forward through the body diode of the MOS tube, and the battery voltage can be discharged all the time to cause unstable power supply.
Therefore, a charging circuit for realizing power path switching is needed, when the USB charging port is connected with an external power supply, the USB charging port supplies power to the later-stage circuit; when the USB charging port is not connected with an external power supply, the rechargeable battery supplies power to the rear-stage circuit, so that the rechargeable battery and the USB charging port supply power independently.
Disclosure of Invention
In order to overcome the defects, the utility model provides a charging circuit for realizing power path switching.
The utility model is realized by the following technical scheme: the utility model provides a realize charging circuit that power supply path switched, includes power module and selection module, and power module contains USB charging port and rechargeable battery, and USB charging port output's voltage and rechargeable battery output's voltage insert selection module respectively, and the electric isolation between USB charging port voltage and the rechargeable battery voltage after the selection module handles for USB charging port inserts external power supply and is supplied power by USB charging port alone for the later stage circuit, USB charging port does not insert external power supply and is supplied power by rechargeable battery alone for the later stage circuit.
Further, the USB charging port comprises a charging chip, and the output end of the USB charging port and the output end of the rechargeable battery are respectively connected with the same charging chip, so that the USB charging port is connected with an external power supply and then charges the rechargeable battery through the charging chip.
Further, the charging chip is an english hub IP5328.
Further, the battery voltage regulator comprises a voltage regulator module, wherein the power module and the selection module are respectively connected with the voltage regulator module, the voltage output by the USB charging port in the power module and the voltage output by the rechargeable battery are respectively used as the voltage regulator module, the voltage output by the USB charging port processed by the voltage regulator module and the voltage output by the rechargeable battery are respectively connected to the selection module, the voltage of the USB charging port processed by the voltage regulator module is the voltage regulator VBUS for charging, the voltage of the rechargeable battery processed by the voltage regulator module is the voltage regulator VBAT for charging, and the voltage regulator VBUS for charging and the voltage regulator VBAT for charging are both constant voltages.
Further, the selection module comprises a first PMOS tube Q1 and a first control circuit, the D electrode of the first PMOS tube Q1 is connected with the charging voltage regulating VBUS, the G electrode of the first PMOS tube Q1 is connected with the first control circuit, the first control circuit is used for controlling the on-off state of the first PMOS tube Q1, and the S electrode of the first PMOS tube Q1 is connected with the output end of the subsequent-stage circuit.
Further, the first control circuit includes NPN triode Q2, resistance R1, resistance R2 and resistance R3, NPN triode Q2's E utmost point ground connection, NPN triode Q2's C utmost point inserts first PMOS pipe Q1's G utmost point jointly after being connected with resistance R1 one end, resistance R1's the other end inserts whole voltage VBUS that charges, and resistance R2 one end inserts whole voltage VBUS that charges, and resistance R2 other end inserts NPN triode Q2's B utmost point jointly after being connected with resistance R3 one end, and resistance R3's the other end ground connection.
Further, the selection module further comprises a second PMOS tube Q3 and a second control circuit, the D electrode of the second PMOS tube Q3 is connected with the full-voltage VBAT of the rechargeable battery, the G electrode of the second PMOS tube Q3 is connected with the second control circuit, the second control circuit is used for controlling the on-off of the second PMOS tube Q3, the S electrode of the second PMOS tube Q3 is connected with the output end of the post-stage circuit, and the S electrode of the second PMOS tube Q3 is connected with the S electrode of the first PMOS tube Q1.
Further, the selection module further comprises a third PMOS tube Q4, the S electrode of the third PMOS tube Q4 is connected with the S electrode of the second PMOS tube Q3, the D electrode of the third PMOS tube Q4 is connected with the output end of the post-stage circuit, the D electrode of the third PMOS tube Q4 is connected with the S electrode of the first PMOS tube Q1, and the G electrode of the third PMOS tube Q4 is connected with the G electrode of the second PMOS tube Q3 and then is connected with the second control circuit.
Further, the second control circuit comprises a resistor R4 and a resistor R5, one end of the resistor R4 is connected to the charging voltage VBUS, the other end of the resistor R4 is connected with one end of the resistor R5 and then is connected to the G pole of the third PMOS tube Q4 and the G pole of the second PMOS tube Q3 together, and the other end of the resistor R5 is grounded.
Further, the second control circuit includes a capacitor C1, one end of the capacitor C1 is connected to one end of the resistor R4 connected to the high level, and the other end of the capacitor C1 is connected to one end of the resistor R5 grounded.
The utility model has the advantages that: the USB charging voltage regulating VBUS and the rechargeable battery voltage regulating VBAT are respectively taken as input terminals to be connected with the selection module. The USB charging voltage regulating voltage VBUS and the rechargeable battery voltage regulating voltage VBAT processed by the selection module are respectively used as output ends to be connected into a post-stage circuit. The USB charging voltage VBUS processed by the selection module and the rechargeable battery voltage VBAT are electrically isolated through a PMOS tube, so that the USB charging port is connected with an external power supply to independently supply power to the rear-stage circuit through the USB charging port, and the USB charging port is not connected with the external power supply to independently supply power to the rear-stage circuit through the rechargeable battery. And one end of the power chip is connected with the USB charging port, and the other end of the power chip is connected with the rechargeable battery, so that the USB charging port can charge the rechargeable battery through the power chip under the condition of being connected with an external power supply.
Drawings
FIG. 1 is a block diagram of a power module and a voltage regulator module according to the present utility model;
fig. 2 is a circuit schematic of the selection module of the present utility model.
In the figure: 1-USB charging port; 2-a charging chip; 3-a rechargeable battery; 4-a first power chip; 5-a second power chip.
Detailed Description
The utility model will be further described with reference to the accompanying drawings and detailed description below: referring to fig. 1 and fig. 2, a charging circuit for implementing power path switching includes a power module, a voltage regulator module, and a selection module. The power module includes rechargeable battery 3 and USB charge mouth 1, and rechargeable battery 3 and USB charge mouth 1 all are used for providing input voltage to the rectifying module to USB charge mouth 1 charges rechargeable battery 3 through chip 2 that charges. Charging chip 2 is an english hub IP5328. The voltage regulating module is used for regulating the voltage input by the rechargeable battery 3 and the USB charging port 1. The charging voltage of the USB charging port 1 and the charging voltage of the rechargeable battery 3 after the voltage regulation are used as input signals of a selection module.
The rectifying module comprises two power supply chips, namely a first power supply chip 4 and a second power supply chip 5. The first power chip 4 is MP3415GG, and the second power chip 5 is MP8715DN-LF-Z. The USB charging port 1 is electrically connected with the first power chip 4, and the rechargeable battery 3 is electrically connected with the second power chip 5. In this embodiment, the output voltage of the USB charging port 1 after being regulated by the first power chip 4 is the charging regulated voltage VBUS, and the charging regulated voltage VBUS is constant to 5V. The output voltage of the rechargeable battery 3 after being rectified by the second power chip 5 is the battery rectifying voltage VBAT, and the battery rectifying voltage VBAT is constant to be 5V.
The output voltage of the USB charging port 1 after being regulated by the first power chip 4 and the output voltage of the rechargeable battery 3 after being regulated by the second power chip 5 are respectively used as input signals of the selection module. The selection module comprises three PMOS tubes and two control units. The three PMOS tubes are respectively a first PMOS tube Q1, a second PMOS tube Q3 and a third PMOS tube Q4. The two control units are a first control unit and a second control unit respectively.
The D pole of the first PMOS tube Q1 is connected to the charging voltage regulating VBUS. The S pole of the first PMOS tube Q1 is used as an output end connected with a post-stage circuit. The G pole of the first PMOS tube Q1 is connected with the first control unit. The first control unit includes an NPN transistor Q2, a resistor R1, a resistor R2, and a resistor R3. The C pole of the NPN triode Q2 is connected with the G pole of the first PMOS tube Q1 and then is connected with one end of a pull-up resistor R1, and the other end of the resistor R1 is connected with a charging voltage regulating VBUS. One end of the resistor R2 is connected to the charging voltage VBUS, the other end of the resistor R2 is connected with one end of the resistor R3 and then is connected to the B pole of the NPN triode Q2, and the other end of the resistor R3 is connected with the E pole of the NPN triode Q2 and then is grounded.
The D electrode of the second PMOS tube Q3 is connected to the battery voltage regulating VBAT. The S pole of the second PMOS transistor Q3 is electrically connected to the S pole of the third PMOS transistor Q4, that is, the second PMOS transistor Q3 and the third PMOS transistor Q4 are connected in reverse series to block the charging voltage VBUS after voltage regulation from being applied to the rechargeable battery 3 through the second PMOS transistor. The G pole of the second PMOS tube Q3 and the G pole of the third PMOS tube Q4 are electrically connected with the second control unit. The second control unit includes a capacitor C1, a resistor R4, and a resistor R5. One end of the resistor R4 is connected to the charging voltage VBUS, the other end of the resistor R4 is connected with one end of the resistor R5 together, the output end is connected to the G pole of the second PMOS tube Q3 and the G pole of the third PMOS tube Q4, and the other end of the resistor R5 is grounded. One end of a capacitor C1 is connected with one end of a resistor R4 connected with the charging voltage VBUS, and the other end of the capacitor C1 is connected with one grounded end of a resistor R5.
The post-stage circuit is connected with the post-output end by the common connection of the S pole of the first PMOS tube Q1 and the D pole of the third PMOS tube Q4.
Working principle: the USB charging port 1 is not connected to an external power supply, and the rechargeable battery 3 supplies power to the rear-stage circuit. The output voltage of the rechargeable battery 3 after being rectified by the second power chip 5 is the battery rectifying voltage VBAT. The D electrode of the second PMOS tube Q3 is connected to the battery voltage VBAT, and the common connection end of the G electrode of the second PMOS tube Q3 and the G electrode of the third PMOS tube Q4 is connected with the common connection end of the resistor R4 and the resistor R5. Because the USB charging port 1 is not connected with an external power supply, namely the value of the charging voltage VBUS is zero. The G pole of the second PMOS tube Q3 and the G pole of the third PMOS tube Q4 are respectively equivalent to the ground. At this time, the second PMOS transistor Q3 and the third PMOS transistor Q4 both meet the on condition, and the battery voltage VBAT supplies power to the post-stage circuit through the D pole of the third PMOS transistor Q4. At this time, only the rechargeable battery 3 supplies power to the subsequent circuit.
The USB charging port 1 is connected with an external power supply, at the moment, the USB charging port 1 supplies power to a rear-stage circuit, and meanwhile, the USB charging port 1 charges the rechargeable battery 3 through the charging chip 2. The output voltage of the USB charging port 1 after the voltage is regulated by the first power chip 4 is the charging voltage VBUS, so that the NPN triode Q2 meets the conduction condition. The NPN triode Q2 is conducted to enable the G electrode of the first PMOS tube Q1 to be approximately grounded, so that the first PMOS tube Q1 meets the conduction condition, and further the charging voltage regulating VBUS supplies power for a later-stage circuit. At this time, the D-pole voltage of the third PMOS transistor Q4 is clamped to the charging voltage VBUS. Due to the effect of the charging voltage VBUS, the second PMOS tube Q3 and the third PMOS tube Q4 do not meet the conduction condition. At this time, only the charging voltage VBUS supplies power to the subsequent-stage circuit. Simultaneously, the USB charging port 1 charges the rechargeable battery 3 through the charging chip 2.
Wherein the arrow of fig. 1 indicates the output voltage of the previous module as the input voltage of the next module.
Various other corresponding changes and modifications will occur to those skilled in the art from the foregoing description and the accompanying drawings, and all such changes and modifications are intended to be included within the scope of the present utility model as defined in the appended claims.
Claims (10)
1. A charging circuit for implementing power path switching, characterized in that: the USB charging port is connected with an external power supply through the USB charging port, the external power supply is independently supplied to a rear-stage circuit through the USB charging port, and the external power supply is not connected with the USB charging port and is independently supplied to the rear-stage circuit through the rechargeable battery.
2. A charging circuit for effecting power path switching as recited in claim 1, wherein: the USB charging port is connected with the external power supply through the charging chip, and the USB charging port is connected with the external power supply through the charging chip.
3. A charging circuit for effecting power path switching as recited in claim 2, wherein: the charging chip is an english hub IP5328.
4. A charging circuit for effecting power path switching as recited in claim 1, wherein: the voltage output by the USB charging port processed by the voltage regulating module and the voltage output by the rechargeable battery are respectively connected to the selection module, the voltage processed by the voltage regulating module is the voltage VBUS of the charging voltage regulating voltage, the voltage processed by the voltage regulating module is the voltage VBAT of the battery voltage regulating voltage, and the voltage VBUS of the charging voltage regulating voltage and the voltage VBAT of the battery voltage regulating voltage are both constant voltages.
5. A charging circuit for effecting power path switching as recited in claim 4 wherein: the selection module comprises a first PMOS tube Q1 and a first control circuit, wherein the D electrode of the first PMOS tube Q1 is connected with the charging voltage regulating VBUS, the G electrode of the first PMOS tube Q1 is connected with the first control circuit, the first control circuit is used for controlling the on-off state of the first PMOS tube Q1, and the S electrode of the first PMOS tube Q1 is connected with the output end of the subsequent-stage circuit.
6. A charging circuit for effecting power path switching as recited in claim 5 wherein: the first control circuit comprises an NPN triode Q2, a resistor R1, a resistor R2 and a resistor R3, wherein the E electrode of the NPN triode Q2 is grounded, the C electrode of the NPN triode Q2 is connected with one end of the resistor R1 and then commonly connected with the G electrode of the first PMOS tube Q1, the other end of the resistor R1 is connected with a charging voltage regulating VBUS, one end of the resistor R2 is connected with the charging voltage regulating VBUS, the other end of the resistor R2 is connected with one end of the resistor R3 and then commonly connected with the B electrode of the NPN triode Q2, and the other end of the resistor R3 is grounded.
7. A charging circuit for effecting power path switching as recited in claim 5 wherein: the selection module further comprises a second PMOS tube Q3 and a second control circuit, the D electrode of the second PMOS tube Q3 is connected to the full-voltage VBAT of the rechargeable battery, the G electrode of the second PMOS tube Q3 is connected to the second control circuit, the second control circuit is used for controlling the on-off of the second PMOS tube Q3, the S electrode of the second PMOS tube Q3 is connected with the output end of the rear-stage circuit, and the S electrode of the second PMOS tube Q3 is connected with the S electrode of the first PMOS tube Q1.
8. A charging circuit for effecting power path switching as recited in claim 7 wherein: the selection module further comprises a third PMOS tube Q4, the S electrode of the third PMOS tube Q4 is connected with the S electrode of the second PMOS tube Q3, the D electrode of the third PMOS tube Q4 is connected with the output end of the post-stage circuit, the D electrode of the third PMOS tube Q4 is connected with the S electrode of the first PMOS tube Q1, and the G electrode of the third PMOS tube Q4 is connected with the G electrode of the second PMOS tube Q3 and then is connected into the second control circuit together.
9. A charging circuit for effecting power path switching as recited in claim 8, wherein: the second control circuit comprises a resistor R4 and a resistor R5, one end of the resistor R4 is connected to the charging voltage VBUS, the other end of the resistor R4 is connected with one end of the resistor R5 and then is connected to the G pole of the third PMOS tube Q4 and the G pole of the second PMOS tube Q3 together, and the other end of the resistor R5 is grounded.
10. A charging circuit for effecting power path switching as recited in claim 9, wherein: the second control circuit comprises a capacitor C1, one end of the capacitor C1 is connected with one end of the resistor R4 connected with a high level, and the other end of the capacitor C1 is connected with one end of the resistor R5 grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320228323.0U CN219643618U (en) | 2023-02-14 | 2023-02-14 | Charging circuit for realizing power path switching |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320228323.0U CN219643618U (en) | 2023-02-14 | 2023-02-14 | Charging circuit for realizing power path switching |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219643618U true CN219643618U (en) | 2023-09-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320228323.0U Active CN219643618U (en) | 2023-02-14 | 2023-02-14 | Charging circuit for realizing power path switching |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219643618U (en) |
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2023
- 2023-02-14 CN CN202320228323.0U patent/CN219643618U/en active Active
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