CN201839323U - Mobile terminal with surge protection circuit - Google Patents
Mobile terminal with surge protection circuit Download PDFInfo
- Publication number
- CN201839323U CN201839323U CN2010202790986U CN201020279098U CN201839323U CN 201839323 U CN201839323 U CN 201839323U CN 2010202790986 U CN2010202790986 U CN 2010202790986U CN 201020279098 U CN201020279098 U CN 201020279098U CN 201839323 U CN201839323 U CN 201839323U
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- Prior art keywords
- portable terminal
- surge protection
- protection circuit
- oxide
- charging
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Abstract
The utility model discloses a mobile terminal with a surge protection circuit, which comprises a charging port, a power management unit (PMU), a battery and a charging surge protection circuit arranged between the charging port and the PMU, wherein the charging surge protection circuit comprises a low pass filter circuit, a switch control circuit, a diode and a first resistor, an input terminal of the low pass filter circuit is connected with an output terminal of the charging port, the output terminal of the low pass filter circuit is connected with a first input terminal of the PMU, the first input terminal of the switch control circuit is connected with the low pass filter circuit, a second input terminal of the switch control circuit is connected with the output terminal of the PMU, the output terminal of the switch control circuit is connected with the first resistor through the diode, the first resistor is connected with the anode of the battery, and the cathode of the battery is grounded. In the utility model, the mobile terminal is internally provided with the charging surge protection circuit, so as to effectively protect all ports of the mobile terminal and the battery.
Description
Technical field
The utility model relates to electronic technology field, particularly a kind of portable terminal with surge protection circuit.
Background technology
Mobile phone charging function and mobile phone safe in utilization closely bound up, voltage ripple of power network and user's abnormal operation may cause charger output surge voltage, if surge voltage is impacted mobile phone in the charging process, will cause potential safety hazard.
The self-adjusting of regular handset charger is limited in one's ability, generally can only adjust 30KHz (Kilo hertz, KHz) to the voltage fluctuation of 60KHz frequency, and in actual use, voltage fluctuation can take place in the electrical network of certain areas, perhaps the user receives charger on the mobile phone earlier, charger is inserted situations such as charging socket again.
Above-mentioned situation all may cause to be higher than the 60KHz voltage fluctuation, makes charger for mobile phone lose the self-regulated ability and exports surge voltage, insert the moment of socket such as charger, can export about a lasting 20ns (Nano seconds, nanosecond), peak-to-peak value (Vpp) is the surge voltage of 30V.Surge voltage enters mobile phone, will impact to mobile phone, causes the mobile phone damage probably or causes other adverse consequences.
See also Fig. 1, it is the charging circuit of conventional mobile phone, and it comprises charging port 101, capacitor C 0, metal-oxide-semiconductor M0, diode D0, resistance R 0 and PMU (Power Management, Power Management Unit) unit 102.The output of charging port 101 is connected with the first input end of PMU unit 102, and an end of described capacitor C 0 connects the first input end of PMU unit 102, other end ground connection.The source electrode of metal-oxide-semiconductor M0 connects the first input end of PMU unit 102, and grid connects the output of PMU unit 102, and drain electrode is connected with resistance R 0 by diode D0, and 0 of resistance R is connected with battery.And the negative electrode of diode R0 is connected with second input of PMU unit, and the positive pole of battery B0 is connected with second input of PMU unit 102.
In the charging circuit of above-mentioned mobile phone, at the protective circuit of surge voltage, in case surge takes place, cellular phone power supplies input, each control port and battery itself all will not impacted.Though OVP (over voltage protection, overvoltage protection) device is arranged on the market, and its reaction time is about 5us, can not play effective protection to surge, and cost is higher.
Thereby the surge protection technology of existing portable terminal is still waiting to improve and improve.
The utility model content
In view of above-mentioned the deficiencies in the prior art part, the purpose of this utility model is to provide a kind of portable terminal with surge protection circuit, and the surge voltage that produces in the time of eliminating charging when the terminal terminal charge plays the surge protection effect.
In order to achieve the above object, the utility model has been taked following technical scheme:
A kind of portable terminal with surge protection circuit, described portable terminal comprises charging port, PMU unit and battery, among its spy, also comprises the charging surge protection circuit that is arranged between described charging port and the PMU unit;
Described charging surge protection circuit comprises low-pass filter circuit, ON-OFF control circuit, diode and first resistance;
The input of described low-pass filter circuit is connected with the output of charging port, and the output of low-pass filter circuit is connected with the first input end of described PMU unit;
The first input end of described ON-OFF control circuit is connected with low-pass filter circuit, and second input is connected with the output of PMU unit, and the output of described ON-OFF control circuit is connected with first resistance by described diode;
Described first resistance connects the positive pole of described battery, the minus earth of battery; Wherein, the negative electrode of described diode is connected with second input of described PMU unit, and the positive pole of battery is connected with the 3rd input of described PMU unit.
Described portable terminal with surge protection circuit, wherein, described low-pass filter circuit comprises the inductance and first electric capacity; Described inductance is arranged between the first input end of the output of charging port and described PMU unit, and an end of described first electric capacity is connected with described inductance, other end ground connection.
Described portable terminal with surge protection circuit, wherein, ON-OFF control circuit comprises the metal-oxide-semiconductor and second electric capacity; The source electrode of described metal-oxide-semiconductor connects the first input end of described PMU unit, and the grid of metal-oxide-semiconductor connects the output of PMU unit, and the drain electrode of metal-oxide-semiconductor connects diode; One end of described second electric capacity connects the source electrode of metal-oxide-semiconductor, and the other end connects the grid of metal-oxide-semiconductor.
Described portable terminal with surge protection circuit wherein, is provided with second resistance between the output of the grid of metal-oxide-semiconductor and PMU unit.
Described portable terminal with surge protection circuit, wherein, described metal-oxide-semiconductor is the P channel MOS tube.
Described portable terminal with surge protection circuit, wherein, described portable terminal is a mobile phone.
The portable terminal with surge protection circuit that the utility model provides is provided with a charging surge protection circuit owing to adopted in portable terminal, played the effect of charging surge protection when portable terminal charges.And this charging surge protection circuit comprises a low-pass filter circuit and ON-OFF control circuit, has realized two-stage surge voltage protection in portable terminal, makes each port of portable terminal and battery all obtain effective protection.
Description of drawings
Fig. 1 is the charging circuit figure of prior art mobile phone;
Fig. 2 is the utility model portable terminal charging circuit theory diagram;
Fig. 3 is the utility model portable terminal charging surge protection circuit schematic diagram;
Fig. 4 is the utility model portable terminal charging surge protection circuit schematic diagram.
Embodiment
The utility model provides a kind of portable terminal with surge protection circuit; described portable terminal is mobile phone, MP3 (Moving Picture Experts Group Audio Layer III; dynamic image expert compression standard audio frequency aspect 3), electronic products such as Personal Handyphone System.The utility model has increased a low-pass filter circuit and an ON-OFF control circuit in portable terminal has the charging circuit of portable terminal of surge protection circuit; make this charging road have the two-stage defencive function; when portable terminal has the portable terminal charging of surge protection circuit, can play the effect of eliminating surge voltage.
For making the purpose of this utility model, technical scheme and effect clearer, clear and definite, below with reference to accompanying drawing and give an actual example the utility model is further described.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
See also Fig. 2, portable terminal of the present utility model comprises charging port 110, PMU unit 120, battery B1 and charging surge protection circuit 130.Described charging port 110 is arranged on the housing of portable terminal, is used to insert charger, and the PMU unit is the power management chip that conventional portable terminal uses.Wherein, described charging surge protection circuit 130 is arranged between charging port 110 and the PMU unit 120, and this charging surge protection circuit 130 works to eliminate surge voltage when charging.
See also Fig. 3, described charging surge protection circuit 130 comprises low-pass filter circuit 131, ON-OFF control circuit 132, diode D1 and first resistance R 1.
Wherein, described PMU unit 120 comprises and is used to detect the first input end 1 whether charger inserts, and is used to detect second input 3 of charging current, is used to the output 2 that detects the 3rd input 4 of battery input voltage and be used for charge switch is controlled.
First output of described charging port 110 connects the input of low-pass filter circuit 131, second output head grounding, and the output of low-pass filter circuit 131 is connected with the first input end 1 of PMU unit 120.This low-pass filter circuit 131 is the first order protective circuit of portable terminal, the surge voltage that produces when being mainly used in the charging of decay portable terminal, thus significantly reduce the surge energy that enters portable terminal.
Wherein, the first input end 5 of described ON-OFF control circuit 132 is connected with the output of low-pass filter circuit 131, second input 6 of ON-OFF control circuit 132 is connected with the output 2 of PMU unit 120, and the output 7 of ON-OFF control circuit 132 is connected with the anode of diode D1.When still there was surge energy in the voltage on being added in described ON-OFF control circuit 132, this ON-OFF control circuit 132 was turn-offed the charging path of portable terminal, to reach the purpose of protection back-end circuit.
In the present embodiment, the negative electrode of described diode D1 is by the positive pole of first resistance R, 1 connection battery B 1, and wherein, the negative electrode of diode D1 also connects second input 3 of PMU unit 120, and this second input 3 is mainly used in and detects the charging current that flows through diode D1.The 3rd input 4, the three inputs 4 that the minus earth of battery B1, its positive pole also connect PMU unit 120 are mainly used in the input that detects battery B1 voltage, when cell voltage is full of, and PMU unit 120 its output 2 charge closing circuit of control.
See also Fig. 4, described low-pass filter circuit 131 comprises the inductance L 1 and first capacitor C 1.Wherein, described inductance L 1 is connected between the first input end 1 of first output of charging port 110 and PMU unit 120, and an end of first capacitor C 1 is connected other end ground connection with described inductance L 1.
In the present embodiment, the value of inductance L 1 is 10uH, and the value of first electric capacity is 10uF, so the cut-off frequency of this low-pass filter circuit 131 is
Aforementioned 20ns surge pulse frequency is 50KHz, so this low-pass filter circuit has than the high attenuation effect this type of surge, can significantly reduce the surge energy that enters portable terminal.Certainly, in the utility model low-pass filter circuit, the span of the voltage and first electric capacity can also be adjusted according to the surge voltage frequency that may run in the practical application.
Please continue to consult Fig. 3 and Fig. 4, described ON-OFF control circuit 132 comprises metal-oxide-semiconductor (metal oxidsemiconductor, the field-effect transistor) M1 and second capacitor C 2.The source S of described metal-oxide-semiconductor M1 and PMU unit 120 first input end 1 be connected, the grid G of metal-oxide-semiconductor M1 is connected with the output 2 of PMU unit 120, the drain D of metal-oxide-semiconductor M1 is connected with the anode of diode D1.Wherein, described metal-oxide-semiconductor is the P channel MOS tube, the main on-off action that rises in the portable terminal charging circuit.
Described second capacitor C 2 is arranged between the source S and grid G of metal-oxide-semiconductor M1, and promptly an end of this second capacitor C 2 connects the source S of metal-oxide-semiconductor, and the other end connects the grid G of metal-oxide-semiconductor, and this second electric capacity is a main coupling in ON-OFF control circuit.In the present embodiment, between the output of the grid G of metal-oxide-semiconductor M1 and PMU unit 120, also be in series with second resistance R 2.
When portable terminal charged, this second capacitor C 2 was mainly used in surge voltage is coupled to grid G from the source S of metal-oxide-semiconductor M1, forced metal-oxide-semiconductor M1 to turn-off, to reach the purpose of protection back-end circuit.In the present embodiment, described second resistance R 2 is mainly used in the Coupling Potential that the metal-oxide-semiconductor grid G is provided, and also plays the effect of protection PMU unit 120 ports.
When portable terminal charged, charging current flow through inductance L 1, metal-oxide-semiconductor M1, diode D1, first resistance R 1 again to battery B1 successively from charging port 110.By the protection of above-mentioned dual-electrode protecting circuit, effectively protected each port and the battery of portable terminal when portable terminal charges like this.Certainly, in other embodiments, also can select the protective circuit of one of them protective circuit when charging earlier as portable terminal.
In sum, the portable terminal with surge protection circuit that the utility model provides is provided with a charging surge protection circuit owing to adopted in portable terminal, played the effect of charging surge protection when portable terminal charges.And this charging surge protection circuit comprises a low-pass filter circuit and ON-OFF control circuit, has realized two-stage surge voltage protection in portable terminal, makes each port of portable terminal and battery all obtain effective protection.
The utility model has only increased a resistance, an electric capacity and an inductance on the charging circuit of existing portable terminal routine, constituted a two-stage charge protector, realize than being easier on circuit, and its cost is also lower.
Be understandable that; for those of ordinary skills; can be equal to replacement or change according to the technical solution of the utility model and utility model design thereof, and all these changes or replacement all should belong to the protection range of the appended claim of the utility model.
Claims (6)
1. portable terminal with surge protection circuit, described portable terminal comprises charging port, PMU unit and battery, it is characterized in that, also comprises the charging surge protection circuit that is arranged between described charging port and the PMU unit;
Described charging surge protection circuit comprises low-pass filter circuit, ON-OFF control circuit, diode and first resistance;
The input of described low-pass filter circuit is connected with the output of charging port, and the output of low-pass filter circuit is connected with the first input end of described PMU unit;
The first input end of described ON-OFF control circuit is connected with low-pass filter circuit, and second input is connected with the output of PMU unit, and the output of described ON-OFF control circuit is connected with first resistance by described diode;
Described first resistance connects the positive pole of described battery, the minus earth of battery; Wherein, the negative electrode of described diode is connected with second input of described PMU unit, and the positive pole of battery is connected with the 3rd input of described PMU unit.
2. the portable terminal with surge protection circuit according to claim 1 is characterized in that, described low-pass filter circuit comprises the inductance and first electric capacity; Described inductance is arranged between the first input end of the output of charging port and described PMU unit, and an end of described first electric capacity is connected with described inductance, other end ground connection.
3. the portable terminal with surge protection circuit according to claim 1 and 2 is characterized in that, ON-OFF control circuit comprises the metal-oxide-semiconductor and second electric capacity; The source electrode of described metal-oxide-semiconductor connects the first input end of described PMU unit, and the grid of metal-oxide-semiconductor connects the output of PMU unit, and the drain electrode of metal-oxide-semiconductor connects diode; One end of described second electric capacity connects the source electrode of metal-oxide-semiconductor, and the other end connects the grid of metal-oxide-semiconductor.
4. the portable terminal with surge protection circuit according to claim 3 is characterized in that, is provided with second resistance between the output of the grid of metal-oxide-semiconductor and PMU unit.
5. the portable terminal with surge protection circuit according to claim 3 is characterized in that, described metal-oxide-semiconductor is the P channel MOS tube.
6. the portable terminal with surge protection circuit according to claim 1 is characterized in that, described portable terminal is a mobile phone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202790986U CN201839323U (en) | 2010-07-30 | 2010-07-30 | Mobile terminal with surge protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202790986U CN201839323U (en) | 2010-07-30 | 2010-07-30 | Mobile terminal with surge protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201839323U true CN201839323U (en) | 2011-05-18 |
Family
ID=44009425
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202790986U Expired - Fee Related CN201839323U (en) | 2010-07-30 | 2010-07-30 | Mobile terminal with surge protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201839323U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102196074A (en) * | 2011-05-20 | 2011-09-21 | 惠州Tcl移动通信有限公司 | Anti-surge charging mobile terminal |
| CN102624051A (en) * | 2012-03-19 | 2012-08-01 | 惠州Tcl移动通信有限公司 | Mobile phone and charging protection circuit |
| CN103683245A (en) * | 2013-12-06 | 2014-03-26 | 四川联友电讯技术有限公司 | Communication base station controller with surge protection function |
| CN104701946A (en) * | 2015-03-25 | 2015-06-10 | 黎凯华 | Surge protection circuit of mobile phone |
| CN106463954A (en) * | 2016-07-15 | 2017-02-22 | 广东欧珀移动通信有限公司 | Surge protection circuit and mobile terminal |
-
2010
- 2010-07-30 CN CN2010202790986U patent/CN201839323U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102196074A (en) * | 2011-05-20 | 2011-09-21 | 惠州Tcl移动通信有限公司 | Anti-surge charging mobile terminal |
| CN102624051A (en) * | 2012-03-19 | 2012-08-01 | 惠州Tcl移动通信有限公司 | Mobile phone and charging protection circuit |
| CN103683245A (en) * | 2013-12-06 | 2014-03-26 | 四川联友电讯技术有限公司 | Communication base station controller with surge protection function |
| CN103683245B (en) * | 2013-12-06 | 2016-05-11 | 四川联友电讯技术有限公司 | There is the communication base station controller of carrying out surge protection |
| CN104701946A (en) * | 2015-03-25 | 2015-06-10 | 黎凯华 | Surge protection circuit of mobile phone |
| CN106463954A (en) * | 2016-07-15 | 2017-02-22 | 广东欧珀移动通信有限公司 | Surge protection circuit and mobile terminal |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110518 Termination date: 20130730 |