CN210327016U - Surge-proof overvoltage protection circuit and mobile terminal - Google Patents
Surge-proof overvoltage protection circuit and mobile terminal Download PDFInfo
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- CN210327016U CN210327016U CN201921200605.XU CN201921200605U CN210327016U CN 210327016 U CN210327016 U CN 210327016U CN 201921200605 U CN201921200605 U CN 201921200605U CN 210327016 U CN210327016 U CN 210327016U
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- mos switch
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- overvoltage protection
- mobile terminal
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Abstract
The utility model discloses a prevent overvoltage crowbar and mobile terminal of surge, in overvoltage crowbar locates a mobile terminal, mobile terminal includes a USB pin that charges, an overvoltage protection chip and a power management circuit, USB charge the pin and be connected with overvoltage crowbar's the insertion pin through a first ground capacitance, overvoltage crowbar's the pin that connects out is connected with power management circuit and battery charging pin respectively through a second ground capacitance, and a indicating circuit is connected to battery charging pin, the utility model discloses an prevent overvoltage crowbar and mobile terminal of surge not only can prevent the surge and discharge static, and simple structure facilitates the production moreover, has more low-voltage indication function convenience of customers to use.
Description
Technical Field
The utility model relates to an overvoltage protection circuit and mobile terminal of anti-surge.
Background
With the increasing powerful functions of smart phones, smart phones have become indispensable articles for use in daily life.
The existing smart phone needs to be provided with an overvoltage protection circuit, and the overvoltage protection circuit can effectively prevent equipment damage caused by overvoltage.
On the other hand, after the mobile phone is powered off, the mobile phone is in a low-voltage state, and even if the mobile phone is connected with the charger at the moment, because the system is not started, the mobile phone screen cannot display the charging state, and cannot give accurate prompt information to a user.
The prior art has the defects that the structure of an overvoltage protection circuit of a mobile terminal is complex, and the mobile terminal cannot prompt the charging state after the power consumption.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is that there is overvoltage protection circuit structure complicacy for overcoming among the prior art mobile terminal, mobile terminal can't indicate the defect of charged state after the electric quantity consumes light, provides one kind and can prevent the surge and put static, and simple structure makes things convenient for the production moreover, more has overvoltage protection circuit and the mobile terminal of the surge of preventing that low voltage instruction function convenience of customers used.
The utility model discloses an above-mentioned technical problem is solved through following technical scheme:
an overvoltage protection circuit for preventing surge is characterized in that the overvoltage protection circuit is arranged in a mobile terminal, the mobile terminal comprises a USB charging pin, an overvoltage protection chip and a power management circuit, the USB charging pin is connected with an access pin of the overvoltage protection chip through a first grounding capacitor, an output pin of the overvoltage protection chip is respectively connected with the power management circuit and a battery charging pin through a second grounding capacitor, the battery charging pin is connected with an indicating circuit, the indicating circuit comprises an indicating lamp, a first MOS switch and a second MOS switch, the battery charging pin is respectively connected with a grid electrode of the first MOS switch, an anode of the indicating lamp and a drain electrode of the second MOS switch, a cathode of the indicating lamp is connected with the drain electrode of the first MOS switch and is grounded through the first MOS switch, the grid electrode of the second MOS switch is connected with the control pin of the power management unit, and the source electrode of the second MOS switch is grounded.
Preferably, the overvoltage protection chip is an overvoltage protection chip of AW329XX, made by Shanghai ai Hao electronic technology corporation.
Preferably, the AW329XX comprises AW32901, AW32902, AW32905, AW32909, AW32910 and AW 32912.
Preferably, the indication circuit further includes a third MOS switch, the system power supply pin is connected to a gate of the third MOS switch, and the cathode of the indicator light is connected to a drain of the third MOS switch and grounded through the third MOS switch.
Preferably, the cathode of the indicator light is connected with the drain of the third MOS switch and connected with the isink pin through the third MOS switch.
Preferably, the drain of the first MOS switch is connected to the drain of the third MOS switch, a resistor is connected between the drain of the first MOS switch and the drain of the third MOS switch, and the other end of the resistor is connected to the isink pin.
Preferably, the battery charging pin is connected with the anode of the diode and is connected with the indicator lamp through the diode, and the system power supply pin is connected with the anode of the diode and is connected with the indicator lamp through the diode.
Preferably, the gate of the second MOS switch is further connected to a GPIO pin of the PMIC.
The utility model also provides a mobile terminal, its characterized in that, mobile terminal includes as above overvoltage crowbar.
Preferably, the mobile terminal is a mobile phone or a tablet computer.
On the basis of the common knowledge in the field, the above preferred conditions can be combined at will to obtain the preferred embodiments of the present invention.
The utility model discloses an actively advance the effect and lie in:
the utility model discloses an overvoltage protection circuit and mobile terminal of anti-surge not only can prevent the surge and put static, and simple structure makes things convenient for production moreover, more has low-voltage indication function convenience of customers to use.
Drawings
Fig. 1 is a schematic structural diagram of an overvoltage protection circuit according to embodiment 1 of the present invention.
Detailed Description
The present invention is further illustrated by way of the following examples, which are not intended to limit the scope of the invention.
Example 1
Referring to fig. 1, the present embodiment provides a mobile terminal, in the present embodiment, the mobile terminal is a mobile phone, and in other embodiments, the mobile terminal may also be a tablet computer.
The overvoltage protection circuit is arranged in a mobile terminal, and the mobile terminal comprises a USB charging pin, an overvoltage protection chip and a power management circuit.
The USB charging pin 31 is connected to the connection pin 34 of the over-voltage protection chip 33 through a first ground capacitor 32.
The output pin 35 of the overvoltage protection chip is connected to the power management circuit 37 and the battery charging pin 11 through a second ground capacitor 36.
In this embodiment, the overvoltage protection chip is an overvoltage protection chip of model AW329XX, manufactured by shanghai ai, inc.
The specific model is AW32912, and in addition, overvoltage protection chips with models of AW32901, AW32902, AW32905, AW32909 or AW32910 can also be selected.
The battery charging pin 11 is connected to an indicating circuit, which includes an indicator light 12, a first MOS switch 13, and a second MOS switch 14.
The display portion of the indicator light 12 is provided in the housing.
The battery charging pin is connected to the gate 131 of the first MOS switch 13, the anode of the indicator light, and the drain 141 of the second MOS switch, respectively.
The cathode of the indicator light is connected to the drain 132 of the first MOS switch and is grounded through the first MOS switch.
The gate 142 of the second MOS switch is connected to the control pin 15 of the power management circuit and the source is grounded.
The anode of the indicator light is also connected with a system power supply pin 16 of the mobile terminal.
After the battery charging pin is connected, the grid of the first MOS switch is at a high level, the battery charging pin is turned on by the switch to supply power to the indicator lamp, and the indicator lamp displays.
After the mobile phone can be started by the battery power, the second MOS switch can be controlled to close the first MOS switch.
Further, when the battery power supply meets the system startup requirement, the charging indicator light is returned to the system software for control, for example, the color of the control light can be controlled to flash alternately, or the effect display of the breathing light is achieved.
The indicating circuit further comprises a third MOS switch 17, the system power supply pin is connected with the grid electrode of the third MOS switch, and the cathode of the indicating lamp is connected with the drain electrode of the third MOS switch and is grounded through the third MOS switch.
The cathode of the indicator light is connected with the drain of the third MOS switch and is connected with the isink pin 18 through the third MOS switch.
The isink pin can be grounded and can be matched with a system power supply pin to control the display mode of the prompting lamp.
The battery charging pin is connected with the anode of a diode 20 and is connected with the indicator lamp through the diode 20, and the system power supply pin is connected with the anode of a diode 21 and is connected with the indicator lamp through the diode.
The drain electrode of the first MOS switch is connected with the drain electrode of the third MOS switch, a resistor 19 is connected between the drain electrode of the first MOS switch and the drain electrode of the third MOS switch, and the other end of the resistor is connected with the isink pin.
The resistor is convenient for a manufacturer to modify in the production process, and when the battery is required to be in an over-discharge state, the charging state is immediately indicated by inserting a charger, and the resistor is reserved; when the charging state is indicated immediately without the insertion of the charger being realized, the resistor is short-circuited.
The gate of the second MOS switch is also connected to GPIO pin 22 of the PMIC.
And the system power supply pin transmits a power supply signal of the breathing lamp to the indicator lamp.
Although particular embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these are examples only and that the scope of the present invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and the principles of the present invention, and these changes and modifications are all within the scope of the present invention.
Claims (10)
1. An overvoltage protection circuit for preventing surge is characterized in that the overvoltage protection circuit is arranged in a mobile terminal, the mobile terminal comprises a USB charging pin, an overvoltage protection chip and a power management circuit, the USB charging pin is connected with an access pin of the overvoltage protection chip through a first grounding capacitor, an output pin of the overvoltage protection chip is respectively connected with the power management circuit and a battery charging pin through a second grounding capacitor, the battery charging pin is connected with an indicating circuit, the indicating circuit comprises an indicating lamp, a first MOS switch and a second MOS switch, the battery charging pin is respectively connected with a grid electrode of the first MOS switch, an anode of the indicating lamp and a drain electrode of the second MOS switch, a cathode of the indicating lamp is connected with the drain electrode of the first MOS switch and is grounded through the first MOS switch, the grid electrode of the second MOS switch is connected with the control pin of the power management unit, and the source electrode of the second MOS switch is grounded.
2. The overvoltage protection circuit of claim 1, wherein the overvoltage protection chip is an AW329XX model number available from shanghai ai, inc.
3. The overvoltage protection circuit of claim 2, wherein the AW329XX comprises AW32901, AW32902, AW32905, AW32909, AW32910, AW 32912.
4. The overvoltage protection circuit of claim 1, wherein the indication circuit further comprises a third MOS switch, the system power supply pin of the mobile terminal is connected to the gate of the third MOS switch, and the cathode of the indicator light is connected to the drain of the third MOS switch and to ground through the third MOS switch.
5. The overvoltage protection circuit of claim 4, wherein the indicator lamp cathode is connected to the drain of the third MOS switch and to an isink pin through the third MOS switch.
6. The overvoltage protection circuit of claim 5, wherein the drain of the first MOS switch is connected to the drain of the third MOS switch, and a resistor is connected between the drain of the first MOS switch and the drain of the third MOS switch, the other end of the resistor being connected to the isink pin.
7. The overvoltage protection circuit of claim 4, wherein said battery charging pin is connected to an anode of a diode and to said indicator light through said diode, and said system supply pin is connected to an anode of a diode and to said indicator light through said diode.
8. The overvoltage protection circuit of claim 1, wherein the gate of the second MOS switch is further connected to a GPIO pin of a PMIC.
9. A mobile terminal, characterized in that it comprises an overvoltage protection circuit according to any one of claims 1 to 8.
10. The mobile terminal of claim 9, wherein the mobile terminal is a mobile phone or a tablet computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921200605.XU CN210327016U (en) | 2019-07-26 | 2019-07-26 | Surge-proof overvoltage protection circuit and mobile terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921200605.XU CN210327016U (en) | 2019-07-26 | 2019-07-26 | Surge-proof overvoltage protection circuit and mobile terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210327016U true CN210327016U (en) | 2020-04-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921200605.XU Active CN210327016U (en) | 2019-07-26 | 2019-07-26 | Surge-proof overvoltage protection circuit and mobile terminal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210327016U (en) |
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2019
- 2019-07-26 CN CN201921200605.XU patent/CN210327016U/en active Active
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