CN104701946A - Surge protection circuit of mobile phone - Google Patents
Surge protection circuit of mobile phone Download PDFInfo
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- CN104701946A CN104701946A CN201510133362.2A CN201510133362A CN104701946A CN 104701946 A CN104701946 A CN 104701946A CN 201510133362 A CN201510133362 A CN 201510133362A CN 104701946 A CN104701946 A CN 104701946A
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- resistance
- mobile phone
- protection circuit
- triode
- surge protection
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Abstract
The invention discloses a surge protection circuit of a mobile phone. The surge protection circuit is connected with a charging port of the mobile phone, a PMU unit and a battery; the surge protection circuit comprises a triode, a first resistor, a second resistor, a third resistor, a first capacitor and a second capacitor; when charging the mobile phone, charging current sequentially flows from the charging port through the first resistor, the triode, a diode, the first resistor and a battery; therefore, the mobile phone in charging can gain the protection of two-stage protection circuits, and as a result, each port of the mobile phone and the battery can be effectively protected.
Description
Technical field
The present invention relates to electronic technology field, particularly a kind of surge protection circuit of mobile phone.
Background technology
The use safety of mobile phone charging function and mobile phone is closely bound up, and the abnormal operation of voltage ripple of power network and user may cause charger to export surge voltage, if surge voltage impact mobile phone in 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 (Kilohertz, KHz) to the voltage fluctuation of 60KHz frequency, and in actual use, can voltage fluctuation be there is in the electrical network of certain areas, or charger is first received on mobile phone by user, then charger is inserted the situations such as charging socket.
Above-mentioned situation, all may cause higher than 60KHz voltage fluctuation, charger for mobile phone is made to lose self-regulated ability and export surge voltage, such as charger inserts the moment of socket, a lasting 20ns (Nano seconds can be exported, nanosecond) left and right, the surge voltage that peak-to-peak value (Vpp) is 30V.Surge voltage enters mobile phone, will impact mobile phone, probably causes mobile phone damage or cause other adverse consequences.
Refer to Fig. 1, it is the charging circuit of conventional cell phone, and it comprises charging port 101, electric capacity C0, metal-oxide-semiconductor M0, diode D0, resistance R0 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 one end of described electric capacity C0 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, drains to be connected with resistance R0 by diode D0, and resistance R0 is then connected with battery.And the negative electrode of diode R0 is connected with the second input of PMU unit, the positive pole of battery B0 is connected with the second input of PMU unit 102.
In the charging circuit of above-mentioned mobile phone, not for the protective circuit of surge voltage, once there is surge, cellular phone power supplies input, each control port and battery itself all will be impacted.Although market there is OVP (over voltage protection, overvoltage protection) device, its reaction time is about 5us, can not play available protecting, and cost is higher to surge.
Thus the surge protection technique of existing mobile phone need to improve.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art part, the object of the present invention is to provide the surge protection circuit of a kind of mobile phone of a kind of hand, the surge voltage produced when can eliminate charging when mobile phone charges, plays surge protection effect.
In order to achieve the above object, this invention takes following technical scheme:
A surge protection circuit for mobile phone, be connected with the charging port of mobile phone, PMU unit and battery, described surge protection circuit comprises triode, the first resistance, the second resistance, the 3rd resistance, the first electric capacity and the second electric capacity;
One end of described first resistance connects charging port, the CHARGER DETECT that the other end of the first resistance connects PMU unit holds, one end of the emitter of triode and the second electric capacity, also by the first capacity earth; The base stage of the other end connecting triode of described second electric capacity, the PMU CONTROL also connecting PMU unit by the second resistance hold, the collector electrode of triode connects the positive pole of diode, the ISENSE of the negative pole connection PMU unit of diode holds, also connects the positive pole of battery and the VBAT end of PMU unit by the 3rd resistance, the minus earth of battery.
In the surge protection circuit of described mobile phone, the resistance of described first resistance is 330 Ω, and the capacitance of the first electric capacity is 1uF.
In the surge protection circuit of described mobile phone, described triode is PNP triode.
In the surge protection circuit of described mobile phone, the resistance of described second resistance is 10K Ω.
In the surge protection circuit of described mobile phone, the resistance of described 3rd resistance is 0 Ω.
The surge protection circuit of a kind of mobile phone provided by the invention, when mobile phone charges, charging current flows through the first resistance, triode, diode, the first resistance again to battery successively from charging port.During the charging of such mobile phone by the protection of above-mentioned dual-electrode protecting circuit, each port of available protecting mobile phone and battery.
Accompanying drawing explanation
Fig. 1 is the charging circuit figure of prior art mobile phone.
Fig. 2 is mobile phone of the present invention charging surge protection circuit schematic diagram.
Embodiment
The invention provides a kind of surge protection circuit of mobile phone, for making object of the present invention, technical scheme and effect clearly, clearly, referring to accompanying drawing examples, the present invention is described in more detail.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Mobile phone one comprises charging port 110, PMU unit 120, battery B1, refers to Fig. 2, and the surge protection circuit of a kind of mobile phone of the present invention comprises: triode Q1, the first resistance R1, the second resistance R2, the 3rd resistance R3, the first electric capacity C1 and the second electric capacity C2.Wherein, described PMU unit 120 comprises the CHARGER DETECT whether inserted for detecting charger and holds, and holds, for detecting the ISENSE end of charging current and the VBAT end for detecting battery input voltage for the PMU CONTROL controlled charge switch.
The CHARGER DETECT that the other end that one end of described first resistance R1 connects charging port 110, first resistance R1 connects PMU unit 120 holds, one end of the emitter of triode Q1 and the second electric capacity C2, also by the first electric capacity C1 ground connection; The base stage of the other end connecting triode Q1 of described second electric capacity C2, the PMU CONTROL also connecting PMU unit by the second resistance R2 hold, the collector electrode of triode Q1 connects the positive pole of diode D1, the ISENSE of the negative pole connection PMU unit of diode D1 holds, also connects the positive pole of battery B1 and the VBAT end of PMU unit by the 3rd resistance R3, the minus earth of battery B1.
In the present embodiment; the resistance of described first resistance is 330 Ω; the capacitance of the first electric capacity is 1uF; described first resistance and the first electric capacity form low-pass filter circuit; this low-pass filter circuit is the first order protective circuit of mobile phone; be mainly used in the surge voltage produced when decaying mobile phone charging, thus significantly reduce the surge energy entering mobile phone.
During concrete enforcement, described triode Q1 is PNP triode, and the resistance of described second resistance R2 is 10K Ω, and the resistance of described 3rd resistance R3 is 0 Ω.Wherein, triode Q1, the second resistance R2, the 3rd resistance R3, diode D1, the second electric capacity C2 form beginning control circuit; when being added in the voltage on described triode Q1 and still there is surge energy, turn off the charging path of mobile phone, to reach the object of protection back-end circuit.
When mobile phone charges, this second electric capacity C2 to be mainly used in surge voltage, from the collector coupled of triode Q1 to base stage, the voltage of transistor base being raised, forcing triode Q1 cut-off, to reach the object of protection back-end circuit.In the present embodiment, described second resistance R 2 is mainly used in the Coupling Potential of the base stage providing triode Q1, also plays the effect of protection PMU unit 120 port.
When mobile phone charges, charging current flows through the first resistance R1, triode Q1, diode D1, the first resistance R2 again to battery B1 successively from charging port 110.During the charging of such mobile phone by the protection of above-mentioned dual-electrode protecting circuit, each port of available protecting mobile phone and battery.
The present invention only adds two resistance and an electric capacity on the charging circuit of existing mobile phone routine; and selected by metal-oxide-semiconductor the triode of current control characteristic to substitute; constituting a two-stage charge protector, circuit realizes than being easier to, and its cost is also lower.
Be understandable that, for those of ordinary skills, can be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, and all these change or replace the protection range that all should belong to the claim appended by the present invention.
Claims (5)
1. a surge protection circuit for mobile phone, be connected with the charging port of mobile phone, PMU unit and battery, it is characterized in that, described surge protection circuit comprises triode, the first resistance, the second resistance, the 3rd resistance, the first electric capacity and the second electric capacity;
One end of described first resistance connects charging port, the CHARGER DETECT that the other end of the first resistance connects PMU unit holds, one end of the emitter of triode and the second electric capacity, also by the first capacity earth; The base stage of the other end connecting triode of described second electric capacity, the PMU CONTROL also connecting PMU unit by the second resistance hold, the collector electrode of triode connects the positive pole of diode, the ISENSE of the negative pole connection PMU unit of diode holds, also connects the positive pole of battery and the VBAT end of PMU unit by the 3rd resistance, the minus earth of battery.
2. the surge protection circuit of mobile phone according to claim 1, is characterized in that, the resistance of described first resistance is 330 Ω, and the capacitance of the first electric capacity is 1uF.
3. the surge protection circuit of mobile phone according to claim 1, is characterized in that, described triode is PNP triode.
4. the surge protection circuit of mobile phone according to claim 1, is characterized in that, the resistance of described second resistance is 10K Ω.
5. the surge protection circuit of mobile phone according to claim 1, is characterized in that, the resistance of described 3rd resistance is 0 Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510133362.2A CN104701946A (en) | 2015-03-25 | 2015-03-25 | Surge protection circuit of mobile phone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510133362.2A CN104701946A (en) | 2015-03-25 | 2015-03-25 | Surge protection circuit of mobile phone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104701946A true CN104701946A (en) | 2015-06-10 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510133362.2A Pending CN104701946A (en) | 2015-03-25 | 2015-03-25 | Surge protection circuit of mobile phone |
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| Country | Link |
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| CN (1) | CN104701946A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201839323U (en) * | 2010-07-30 | 2011-05-18 | 惠州Tcl移动通信有限公司 | Mobile terminal with surge protection circuit |
| CN102196071A (en) * | 2010-07-30 | 2011-09-21 | 惠州Tcl移动通信有限公司 | Mobile terminal |
| CN102324580A (en) * | 2011-05-20 | 2012-01-18 | 惠州Tcl移动通信有限公司 | Mobile phone as well as charging circuit and method of cell thereof |
| CN102611154A (en) * | 2012-03-02 | 2012-07-25 | 惠州Tcl移动通信有限公司 | Charging circuit with function of inhibiting transient voltage and mobile phone with charging circuit |
-
2015
- 2015-03-25 CN CN201510133362.2A patent/CN104701946A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201839323U (en) * | 2010-07-30 | 2011-05-18 | 惠州Tcl移动通信有限公司 | Mobile terminal with surge protection circuit |
| CN102196071A (en) * | 2010-07-30 | 2011-09-21 | 惠州Tcl移动通信有限公司 | Mobile terminal |
| CN102324580A (en) * | 2011-05-20 | 2012-01-18 | 惠州Tcl移动通信有限公司 | Mobile phone as well as charging circuit and method of cell thereof |
| CN102611154A (en) * | 2012-03-02 | 2012-07-25 | 惠州Tcl移动通信有限公司 | Charging circuit with function of inhibiting transient voltage and mobile phone with charging circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150610 |