CN214506592U - Charging protection circuit and charging circuit for charging power supply - Google Patents
Charging protection circuit and charging circuit for charging power supply Download PDFInfo
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- CN214506592U CN214506592U CN202120347284.7U CN202120347284U CN214506592U CN 214506592 U CN214506592 U CN 214506592U CN 202120347284 U CN202120347284 U CN 202120347284U CN 214506592 U CN214506592 U CN 214506592U
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Abstract
The utility model discloses a charging protection circuit and a charging circuit for a charging power supply, wherein the charging protection circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a first MOS (metal oxide semiconductor) tube and a second MOS tube; the first end of the first resistor, the first end of the second resistor and the first end of the third resistor are all used for being electrically connected with the positive charging end, the second end of the second resistor is grounded through a fourth resistor, the second end of the first resistor is grounded through a first MOS (metal oxide semiconductor) tube, and the second end of the third resistor is grounded through a second MOS tube; the grid electrode of the first MOS tube is connected between the second resistor and the fourth resistor, and the grid electrode of the second MOS tube is connected between the first resistor and the first MOS tube; the second end of the third resistor is used for being electrically connected with the enabling end of the external charging management circuit. The utility model discloses can in time protect the charging management circuit when external input circuit is excessive pressure, it is with low costs, occupation space is little.
Description
Technical Field
The utility model particularly relates to a charging protection circuit and charging circuit for charging source.
Background
In the prior art, the charging protection function is generally implemented by using a charging protection IC in cooperation with a peripheral circuit, which increases the cost of the circuit and occupies the space of the printed circuit board.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a charging protection circuit and charging circuit for charging source to the not enough that cost height, occupation space are big that exist when adopting the charging protection IC cooperation peripheral circuit to realize the charging protection among the prior art, can in time protect the charging management circuit when external input circuit is excessive pressure, with low costs, occupation space is little.
In order to solve the technical problem, the utility model discloses the technical scheme who adopts is:
a charging protection circuit is structurally characterized by comprising a first resistor, a second resistor, a third resistor, a fourth resistor, a first MOS (metal oxide semiconductor) transistor and a second MOS transistor; the first end of the first resistor, the first end of the second resistor and the first end of the third resistor are all used for being electrically connected with the positive charging end, the second end of the second resistor is grounded through a fourth resistor, the second end of the first resistor is grounded through a first MOS (metal oxide semiconductor) tube, and the second end of the third resistor is grounded through a second MOS tube; the grid electrode of the first MOS tube is connected between the second resistor and the fourth resistor, and the grid electrode of the second MOS tube is connected between the first resistor and the first MOS tube; the second end of the third resistor is used for being electrically connected with the enabling end of the external charging management circuit.
Borrow by above-mentioned structure, the utility model discloses utilize the break-make of two MOS pipes to realize the charging protection when excessive pressure, with low costs, occupation space is little.
Further, the device also comprises a voltage stabilizing tube connected between the positive electrode charging end and the ground.
The voltage regulator tube is used for stabilizing the input charging voltage.
As a preferred mode, the first MOS transistor and the second MOS transistor are both N-type MOS transistors; the drain electrode of the first MOS tube is electrically connected with the second end of the first resistor, and the source electrode of the first MOS tube is grounded; the drain electrode of the second MOS tube is electrically connected with the second end of the third resistor, and the source electrode of the second MOS tube is grounded.
Based on the same invention concept, the utility model also provides a charging circuit for charging power supply, including charging interface, charging management circuit, the negative pole charging end ground connection of charging interface, the anodal charging end of charging interface is connected with the power end electricity of charging management circuit, the output of charging management circuit is connected with charging power supply electricity; the charging protection circuit is characterized by also comprising the charging protection circuit; the first end of the first resistor, the first end of the second resistor and the first end of the third resistor are all electrically connected with the positive charging end of the charging interface, and the second end of the third resistor is electrically connected with the enabling end of the charging management circuit.
By means of the structure, when the charging management circuit is charged normally, the charging protection circuit does not influence the normal work of the charging management circuit. When the voltage is over-voltage, the charging protection circuit controls the charging management circuit to stop working, and the charging management circuit is protected.
Preferably, the charging power source is a rechargeable battery.
As a preferred mode, the charging interface is a USB charging interface.
In a preferred embodiment, the charging management circuit includes a charging chip, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first indicator light, and a second indicator light, wherein a positive charging terminal of the charging interface is electrically connected to a VIN pin of the charging chip, an EN pin and a GND pin of the charging chip are both connected between a second terminal of the third resistor and a drain of the second MOS transistor, an NTC pin of the charging chip is connected between a second terminal of the third resistor and a drain of the second MOS transistor through the sixth resistor, an ISET pin of the charging chip is connected between a second terminal of the third resistor and a drain of the second MOS transistor through the seventh resistor, an IBF pin of the charging chip is connected between a second terminal of the third resistor and a drain of the second MOS transistor through the eighth resistor, a BAT pin of the charging chip is electrically connected to a first terminal of the fifth resistor, the first indicator light is connected between a second terminal of the fifth resistor and a CHRG pin of the charging chip, the second indicator light is connected between the second end of the fifth resistor and the PG pin of the charging chip; the BAT pin of the charging chip is electrically connected with the positive electrode of the charging power supply, and the negative electrode of the charging power supply is grounded.
Furthermore, the charging management circuit further comprises a capacitor (for filtering noise waves), one end of the capacitor is electrically connected with the positive electrode of the charging power supply, and the other end of the capacitor is grounded.
Compared with the prior art, the utility model discloses in time protect the charge management circuit when externally input circuit is excessive pressure, it is with low costs, occupation space is little.
Drawings
Fig. 1 is a block diagram of an embodiment of a charging circuit for a charging power supply of the present invention.
Fig. 2 is a circuit diagram of an embodiment of the charging circuit for the charging power supply of the present invention.
The charging protection circuit comprises a charging protection circuit 1, a charging management circuit 2, a charging interface 3, a charging power supply 4, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a first MOS (metal oxide semiconductor) transistor Q1, a second MOS transistor Q2, a voltage regulator D1, a charging chip U1, a first indicator light LED1, a second indicator light LED2 and a capacitor C1.
Detailed Description
As shown in fig. 1 and fig. 2, the charge protection circuit 1 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first MOS transistor Q1, and a second MOS transistor Q2; a first end of the first resistor R1, a first end of the second resistor R2, and a first end of the third resistor R3 are all used for being electrically connected with the positive charging end, a second end of the second resistor R2 is grounded through the fourth resistor R4, a second end of the first resistor R1 is grounded through the first MOS transistor Q1, and a second end of the third resistor R3 is grounded through the second MOS transistor Q2; the gate of the first MOS transistor Q1 is connected between the second resistor R2 and the fourth resistor R4, and the gate of the second MOS transistor Q2 is connected between the first resistor R1 and the first MOS transistor Q1; the second terminal of the third resistor R3 is used for being electrically connected with the enable terminal of the external charge management circuit 2.
The charging protection circuit 1 further includes a voltage regulator D1 connected between the positive charging terminal and ground. The regulator tube D1 is used to regulate the input charging voltage.
In this embodiment, the first MOS transistor Q1 and the second MOS transistor Q2 are both N-type MOS transistors; the drain electrode of the first MOS transistor Q1 is electrically connected with the second end of the first resistor R1, and the source electrode of the first MOS transistor Q1 is grounded; the drain of the second MOS transistor Q2 is electrically connected to the second end of the third resistor R3, and the source of the second MOS transistor Q2 is grounded.
In this embodiment, the two MOS transistors in the charging protection circuit 1 are both N-type MOS transistors for example, and actually, two P-type MOS transistors may be adopted, or a combination of N-type MOS transistors and P-type MOS transistors may be adopted, and the structure and principle are similar to the scheme adopting two N-type MOS transistors.
As shown in fig. 1 and 2, the charging circuit for the charging power supply 4 includes a charging interface 3 and a charging management circuit 2, a negative charging end of the charging interface 3 is grounded, a positive charging end of the charging interface 3 is electrically connected with a power supply end of the charging management circuit 2, and an output end of the charging management circuit 2 is electrically connected with the charging power supply 4; the charging protection circuit also comprises the charging protection circuit 1; the first end of the first resistor R1, the first end of the second resistor R2, and the first end of the third resistor R3 are all electrically connected to the positive charging end of the charging interface 3, and the second end of the third resistor R3 is electrically connected to the enable end of the charging management circuit 2.
The charging power supply 4 is a rechargeable battery.
The charging interface 3 is a USB charging interface and is used for providing an external access interface.
The charging management circuit 2 comprises a charging chip U1(LP28013), a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a first indicator LED1 and a second indicator LED2, wherein the positive charging terminal of the charging interface 3 is electrically connected with the VIN pin of the charging chip U1, the EN pin and the GND pin of the charging chip U1 are both connected between the second terminal of the third resistor R3 and the drain of the second MOS transistor Q2, the NTC pin of the charging chip U1 is connected between the second terminal of the third resistor R3 and the drain of the second MOS transistor Q2 through the sixth resistor R6, the ISBATET pin of the charging chip U1 is connected between the second terminal of the third resistor R3 and the drain of the second MOS transistor Q2 through the seventh resistor R7, the IBF pin of the charging chip U1 is connected between the second terminal of the third resistor R3 and the drain of the second MOS transistor Q2 through the eighth resistor R8, and the drain of the charging chip U1 is electrically connected with the drain of the fifth resistor U5, the first indicator light LED1 is connected between the second end of the fifth resistor R5 and the CHRG pin of the charging chip U1, and the second indicator light LED2 is connected between the second end of the fifth resistor R5 and the PG pin of the charging chip U1; the BAT pin of the charging chip U1 is electrically connected to the positive electrode of the charging power supply 4, and the negative electrode of the charging power supply 4 is grounded.
The charging chip U1(LP28013) and its peripheral circuits are prior art, and only briefly introduced: when the enable terminal EN pin of the charging chip U1 is connected to a high level, the charging chip U1 does not work; when the enable terminal EN pin of the charging chip U1 is connected to low level, the charging chip U1 works. The ISET pin of the charging chip U1 is used to control the magnitude of the charging current. During charging, the first indicator light LED1 is on; after the charging is completed, the first indicator light LED1 goes off, and the second indicator light LED2 goes on.
The charging management circuit 2 further includes a capacitor C1 (for filtering noise), one end of the capacitor C1 is electrically connected to the positive electrode of the charging power supply 4, and the other end of the capacitor C1 is grounded.
The working principle of the utility model is as follows:
when the input voltage Vin from the positive charging terminal of the charging interface 3 is 5V, the input voltage is not over-voltage. According to V1 ═ Vin [ R4/(R2+ R4) ], V1 is smaller, the first MOS transistor Q1 is turned off, the voltage at V2 is higher (equal to Vin, i.e., 5V), the second MOS transistor Q2 is turned on, so the enable terminal EN of the charging chip U1 is connected to a low level, the charging chip U1 operates, that is, the charging management circuit 2 operates normally.
When the input voltage Vin from the positive charging terminal of the charging interface 3 exceeds 5V for some reason (for example, because the quality of the power adapter is poor, the instantaneous voltage of Vin is 6.5V high or always kept above 6.5V), the input voltage is over-voltage. According to V1 ═ Vin [ R4/(R2+ R4) ], at this time, V1 is large, large V1 drives first MOS transistor Q1 to conduct, voltage V2 is rapidly reduced to 0V from the previous high level, so that second MOS transistor Q2 is cut off, enable terminal EN of charging chip U1 is connected to the high level, and charging chip U1 does not work, thereby protecting charging management circuit 2.
In this embodiment, according to the formula V1 ═ Vin × [ R4/(R2+ R4) ], the first MOS transistor Q1 may be turned on when Vin exceeds 5V by selecting appropriate resistances of the second resistor R2 and the fourth resistor R4 and an appropriate first MOS transistor Q1, so that the first MOS transistor Q1 is turned off when Vin is 5V. How to select resistance value and MOS pipe in order to realize above-mentioned function belongs to prior art, does not describe herein in detail, nevertheless does not influence technical staff in this field to the understanding and the realization of the utility model.
The embodiments of the present invention have been described with reference to the accompanying drawings, but the present invention is not limited to the above-mentioned embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many forms without departing from the spirit and scope of the present invention, which is within the protection scope of the present invention.
Claims (8)
1. A charging protection circuit is characterized by comprising a first resistor (R1), a second resistor (R2), a third resistor (R3), a fourth resistor (R4), a first MOS (metal oxide semiconductor) transistor (Q1) and a second MOS transistor (Q2); a first end of a first resistor (R1), a first end of a second resistor (R2) and a first end of a third resistor (R3) are all used for being electrically connected with a positive charging end, a second end of the second resistor (R2) is grounded through a fourth resistor (R4), a second end of the first resistor (R1) is grounded through a first MOS (Q1), and a second end of the third resistor (R3) is grounded through a second MOS (Q2); the grid electrode of the first MOS transistor (Q1) is connected between the second resistor (R2) and the fourth resistor (R4), and the grid electrode of the second MOS transistor (Q2) is connected between the first resistor (R1) and the first MOS transistor (Q1); the second end of the third resistor (R3) is used for being electrically connected with the enabling end of the external charging management circuit (2).
2. The charge protection circuit of claim 1, further comprising a voltage regulator (D1) connected between the positive charging terminal and ground.
3. The charge protection circuit according to claim 1 or 2, wherein the first MOS transistor (Q1) and the second MOS transistor (Q2) are both N-type MOS transistors; the drain electrode of the first MOS transistor (Q1) is electrically connected with the second end of the first resistor (R1), and the source electrode of the first MOS transistor (Q1) is grounded; the drain electrode of the second MOS tube (Q2) is electrically connected with the second end of the third resistor (R3), and the source electrode of the second MOS tube (Q2) is grounded.
4. A charging circuit for a charging power supply comprises a charging interface (3) and a charging management circuit (2), wherein a negative charging end of the charging interface (3) is grounded, a positive charging end of the charging interface (3) is electrically connected with a power supply end of the charging management circuit (2), and an output end of the charging management circuit (2) is electrically connected with the charging power supply (4); -a charge protection circuit (1) according to any of claims 1 to 3; the first end of the first resistor (R1), the first end of the second resistor (R2) and the first end of the third resistor (R3) are all electrically connected with the positive charging end of the charging interface (3), and the second end of the third resistor (R3) is electrically connected with the enabling end of the charging management circuit (2).
5. The charging circuit for a charging power supply according to claim 4, wherein the charging power supply (4) is a rechargeable battery.
6. The charging circuit for a charging power supply according to claim 4, wherein the charging interface (3) is a USB charging interface.
7. The charging circuit of claim 4, wherein the charging management circuit (2) comprises a charging chip (U1), a fifth resistor (R5), a sixth resistor (R6), a seventh resistor (R7), an eighth resistor (R8), a first indicator light (LED1), and a second indicator light (LED2), the positive charging terminal of the charging interface (3) is electrically connected to the VIN pin of the charging chip (U1), the EN pin and the GND pin of the charging chip (U1) are both connected between the second terminal of the third resistor (R3) and the drain of the second MOS transistor (Q2), the NTC pin of the charging chip (U1) is connected between the second terminal of the third resistor (R3) and the drain of the second MOS transistor (Q2) through the sixth resistor (R6), the ISET pin of the drain of the charging chip (U1) is connected between the second terminal of the third resistor (R3) and the second terminal of the second MOS transistor (Q2) through the seventh resistor (R7), an IBF pin of the charging chip (U1) is connected between the second end of the third resistor (R3) and the drain of the second MOS tube (Q2) through an eighth resistor (R8), a BAT pin of the charging chip (U1) is electrically connected with the first end of the fifth resistor (R5), a first indicator light (LED1) is connected between the second end of the fifth resistor (R5) and the CHRG pin of the charging chip (U1), and a second indicator light (LED2) is connected between the second end of the fifth resistor (R5) and the PG pin of the charging chip (U1); the BAT pin of the charging chip (U1) is electrically connected with the anode of the charging power supply (4), and the cathode of the charging power supply (4) is grounded.
8. The charging circuit for a charging power supply according to claim 7, wherein the charging management circuit (2) further comprises a capacitor (C1), one end of the capacitor (C1) is electrically connected to the positive electrode of the charging power supply (4), and the other end of the capacitor (C1) is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120347284.7U CN214506592U (en) | 2021-02-07 | 2021-02-07 | Charging protection circuit and charging circuit for charging power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120347284.7U CN214506592U (en) | 2021-02-07 | 2021-02-07 | Charging protection circuit and charging circuit for charging power supply |
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| CN214506592U true CN214506592U (en) | 2021-10-26 |
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| CN202120347284.7U Active CN214506592U (en) | 2021-02-07 | 2021-02-07 | Charging protection circuit and charging circuit for charging power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114914956A (en) * | 2021-02-07 | 2022-08-16 | 湖南中烟工业有限责任公司 | Charging protection circuit and charging circuit for charging power supply |
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- 2021-02-07 CN CN202120347284.7U patent/CN214506592U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114914956A (en) * | 2021-02-07 | 2022-08-16 | 湖南中烟工业有限责任公司 | Charging protection circuit and charging circuit for charging power supply |
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