CN102611154B - Charging circuit with function of inhibiting transient voltage and mobile phone with charging circuit - Google Patents
Charging circuit with function of inhibiting transient voltage and mobile phone with charging circuit Download PDFInfo
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- CN102611154B CN102611154B CN201210053458.4A CN201210053458A CN102611154B CN 102611154 B CN102611154 B CN 102611154B CN 201210053458 A CN201210053458 A CN 201210053458A CN 102611154 B CN102611154 B CN 102611154B
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- 230000001052 transient effect Effects 0.000 title claims abstract description 35
- 230000002401 inhibitory effect Effects 0.000 title abstract 2
- 239000004065 semiconductor Substances 0.000 claims description 124
- 238000006243 chemical reaction Methods 0.000 claims description 24
- 230000001629 suppression Effects 0.000 claims description 15
- 238000001914 filtration Methods 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Abstract
The invention discloses a charging circuit with a function of inhibiting a transient voltage. The charging circuit comprises a power supply input end, a PMIC (Power Management Integrated Circuit) unit, a first switch tube, a second switch tube, a low pass filter, a diode and a battery, wherein the control pole of the first switch tube is connected with a general input/output end of the PMIC unit, the input pole of the first switch tube is connected with the power supply input end, the output pole of the first switch tube is connected with the input end of the low pass filter, the control pole of the second switch tube is connected with the output end of the low pass filter, the input pole of the second switch tube is connected in parallel with the input pole of the first switch tube, the output pole of the second switch tube is connected with the anode of the diode, and the cathode of the diode is coupled with the anode of the battery. According to the mode, while a charger is inserted to generate a transient high voltage, the transient high voltage is filtered through the low pass filter, thus the voltage passing through the control end of the second switch tube is reduced, and the charging circuit inside the mobile phone is protected.
Description
Technical field
The present invention relates to the communications field, particularly relate to and a kind ofly there is the charging circuit of transient suppression voltage function and adopt the mobile phone of described charging circuit.
Background technology
Along with the use of the electrical equipment such as mobile phone is more and more general, the use of charger is also more and more frequent, present charger is when insertion supply socket, the high voltage transient of more than 30 volts can be produced at the output of charger, this high pressure directly can enter mobile phone and easily damage the charging circuit of mobile phone, causes mobile phone to lose efficacy.But cell phone charging circuit of the prior art, all cannot suppress the high voltage transient produced when charger inserts effectively.
Summary of the invention
The technical problem that the present invention mainly solves is to provide a kind of charging circuit with transient suppression voltage function, can suppress the high voltage transient produced when charger inserts, thus protect the charging circuit of the electrical equipment such as mobile phone.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: provide a kind of charging circuit with transient suppression voltage function, this circuit comprises power input, PMIC unit, the first switching tube, second switch pipe, low pass filter, diode and battery;
Wherein, the control pole of the first switching tube is connected with a universal input output of PMIC unit, and the input pole of the first switching tube is connected with power input, and the output stage of the first switching tube is connected with the input of low pass filter;
The control pole of second switch pipe connects low pass filter output, and the input pole of second switch pipe is extremely in parallel with the input of the first switching tube, and the output stage of second switch pipe connects the anode of diode, and the negative electrode of diode couples the positive pole of battery;
PMIC unit also comprises at least one analog-to-digital conversion input port, for the charging current of the voltage or battery that detect battery;
Wherein, the first switching tube is P ditch metal-oxide-semiconductor, wherein, and the grid of the control of the first switching tube very P ditch metal-oxide-semiconductor, the source electrode of the input of the first switching tube very P ditch metal-oxide-semiconductor, the drain electrode of the output of the first switching tube very P ditch metal-oxide-semiconductor; Second switch pipe is N ditch metal-oxide-semiconductor, the grid of the control of second switch pipe very N ditch metal-oxide-semiconductor, the drain electrode of the input of second switch pipe very N ditch metal-oxide-semiconductor, the source electrode of the output of second switch pipe very N ditch metal-oxide-semiconductor;
Wherein, P ditch metal-oxide-semiconductor adopts common source connection, N ditch metal-oxide-semiconductor adopts common drain connection, the universal input output of PMIC unit is powered by power input, when user inserts charger, a high voltage transient can be produced at power input, now the voltage of the universal input output of PMIC unit is still 0V, so the conducting of P ditch metal-oxide-semiconductor, the transient voltage of power input passes through P ditch metal-oxide-semiconductor to low pass filter, and be low-pass filtered device filtering, the voltage of the grid of N ditch metal-oxide-semiconductor is made to be 0V, and follow the polarity of voltage of the grid of N ditch metal-oxide-semiconductor due to the source electrode of N ditch metal-oxide-semiconductor, and then make the voltage of the source electrode of N ditch metal-oxide-semiconductor also be 0V.
Wherein, low pass filter is single order RC filter, it comprises the first resistance and the first electric capacity, one second resistance is also comprised between low pass filter and N ditch metal-oxide-semiconductor, wherein, the first end of the first resistance connects the drain electrode of P ditch metal-oxide-semiconductor, the first end of the second end of the first resistance, the first end of the first electric capacity, the second resistance and the gate connected in parallel of N ditch metal-oxide-semiconductor, the second end of the first electric capacity and the second end ground connection of the second resistance.
Wherein, circuit comprises a charging current further and detects resistance, and charging current detects resistant series between diode cathode and anode, and the node that diode and charging current detect resistance is connected the first analog-to-digital conversion input port of PMIC unit; Second analog-to-digital conversion input port of PMIC unit connects anode.
For solving the problems of the technologies described above, another technical solution used in the present invention is: provide a kind of charging circuit with transient suppression voltage function, and this circuit comprises power input, PMIC unit, the first switching tube, second switch pipe, low pass filter, diode and battery;
Wherein, the control pole of the first switching tube is connected with a universal input output of PMIC unit, and the input pole of the first switching tube is connected with power input, and the output stage of the first switching tube is connected with the input of low pass filter;
The control pole of second switch pipe connects the output of low pass filter, and the input pole of second switch pipe connects the negative electrode of diode, and the output stage of second switch pipe couples the positive pole of battery;
The anode of diode, the input pole of the first switching tube and power input three are in parallel; And
PMIC unit also comprises at least one analog-to-digital conversion input port, for the charging current of the voltage or battery that detect battery;
Wherein, the first switching tube is P ditch metal-oxide-semiconductor, wherein, and the grid of the control of the first switching tube very P ditch metal-oxide-semiconductor, the source electrode of the input of the first switching tube very P ditch metal-oxide-semiconductor, the drain electrode of the output of the first switching tube very P ditch metal-oxide-semiconductor; Second switch pipe is N ditch metal-oxide-semiconductor, the grid of the control of second switch pipe very N ditch metal-oxide-semiconductor, the drain electrode of the input of second switch pipe very N ditch metal-oxide-semiconductor, the source electrode of the output of second switch pipe very N ditch metal-oxide-semiconductor;
Wherein, P ditch metal-oxide-semiconductor adopts common source connection, N ditch metal-oxide-semiconductor adopts common drain connection, the universal input output of PMIC unit is powered by power input, when user inserts charger, a high voltage transient can be produced at power input, now the voltage of the universal input output of PMIC unit is still 0V, so the conducting of P ditch metal-oxide-semiconductor, the transient voltage of power input passes through P ditch metal-oxide-semiconductor to low pass filter, and be low-pass filtered device filtering, the voltage of the grid of N ditch metal-oxide-semiconductor is made to be 0V, and follow the polarity of voltage of the grid of N ditch metal-oxide-semiconductor due to the source electrode of N ditch metal-oxide-semiconductor, and then make the voltage of the source electrode of N ditch metal-oxide-semiconductor also be 0V.
Wherein, low pass filter is single order RC filter, it comprises the first resistance and the first electric capacity, one second resistance is also comprised between low pass filter and N ditch metal-oxide-semiconductor, wherein, the first end of the first resistance connects the drain electrode of P ditch metal-oxide-semiconductor, the first end of the second end of the first resistance, the first end of the first electric capacity, the second resistance and the gate connected in parallel of N ditch metal-oxide-semiconductor, the second end of the first electric capacity and the second end ground connection of the second resistance.
Wherein, circuit comprises a charging current further and detects resistance, charging current detects resistant series between the source electrode and anode of N ditch metal-oxide-semiconductor, and the node that the source electrode of N ditch metal-oxide-semiconductor and charging current detect resistance is connected the first analog-to-digital conversion input port of PMIC unit; Second analog-to-digital conversion input port of PMIC unit connects anode.
For solving the problems of the technologies described above, another technical solution used in the present invention is: provide a kind of mobile phone, this mobile phone comprise above-mentioned any one there is the charging circuit of transient suppression voltage function.
The invention has the beneficial effects as follows: the situation being different from prior art; the present invention is by increasing second switch pipe and low pass filter; wherein; low pass filter is connected with second switch pipe; the high pressure of moment can be produced when charger inserts; this high pressure by filtered device filtering after low pass filter, thus reduces the voltage of the control end by second switch pipe, and then protects the charging circuit of interior of mobile phone.
Accompanying drawing explanation
Fig. 1 is the circuit diagram with a kind of execution mode of the charging circuit of transient suppression voltage function of the embodiment of the present invention;
Fig. 2 is the circuit diagram with the another kind of embodiment of the charging circuit of transient suppression voltage function of the embodiment of the present invention.
Embodiment
Refer to Fig. 1, Fig. 1 is a kind of embodiment circuit diagram that the present invention has the charging circuit of transient suppression voltage function.As shown in Figure 1, the charging circuit 200 that the present invention has transient suppression voltage function comprises: PMIC (Power Management Integrated Circuit, power management integrated chip) unit 201, power input 202, first switching tube 203, low pass filter 204, second switch pipe 205, diode 206 and battery 207.
Wherein, the control pole of the first switching tube 203 is connected with the universal input output 20 of PMIC unit 201, and the input pole of the first switching tube 203 is connected with power input 202, and the output stage of the first switching tube 203 is connected with the input of low pass filter 204.The control pole of second switch pipe 205 connects the output of low pass filter 204, the input pole of second switch pipe 205 is extremely in parallel with the input of the first switching tube 203, the output stage of second switch pipe 205 connects the anode of diode 206, the negative electrode of diode 206 couples the positive pole of battery 207, the minus earth of battery 207.
In present embodiment, first switching tube 203 is preferably the P ditch metal-oxide-semiconductor shown in Fig. 1, the wherein drain electrode 23 of the control of the first switching tube 203 very input very output very P ditch metal-oxide-semiconductor of source electrode 22, first switching tube 203 of P ditch metal-oxide-semiconductor of grid 21, first switching tube 203 of P ditch metal-oxide-semiconductor.
In present embodiment, second switch pipe 205 is preferably the N ditch metal-oxide-semiconductor in Fig. 1, wherein, and the grid 28 of the control of second switch pipe 205 very N ditch metal-oxide-semiconductor, the drain electrode 29 of the input of second switch pipe 205 very N ditch metal-oxide-semiconductor, the source electrode 30 of the output of second switch pipe 205 very N ditch metal-oxide-semiconductor.
In the present embodiment, low pass filter 204 is low-pass first order filter, and it comprises the first resistance 210 and the first electric capacity 211.Between low pass filter 204 and N ditch metal-oxide-semiconductor 205, comprise the second resistance 208 further, mislead in order to prevent N ditch metal-oxide-semiconductor.
In the present embodiment, the first switching tube 203 adopts common source connection, and second switch pipe 205 adopts common drain connection.Particularly, the grid 21 of P ditch metal-oxide-semiconductor is connected with the universal input output 20 of PMIC unit 201, the source electrode 22 of P ditch metal-oxide-semiconductor is connected with power input 202, the drain electrode 23 of P ditch metal-oxide-semiconductor is connected with the first end 24 of the first resistance 210, second end 25 of the first resistance 210, the first end 26 of the first electric capacity 211, the first end 31 of the second resistance 208 and grid 28 parallel connection of N ditch metal-oxide-semiconductor, second end 27 of the first electric capacity 211 and the second end 32 ground connection of the second resistance 208, the drain electrode 29 of N ditch metal-oxide-semiconductor is in parallel with the source electrode 22 of P ditch metal-oxide-semiconductor, the source electrode 30 of N ditch metal-oxide-semiconductor connects the anode of diode 206, the negative electrode of diode 206 couples the positive pole of battery 207, the minus earth of battery 207.
In the present embodiment, the charging current that the charging circuit 200 with transient suppression voltage function also comprises further detects resistance 209 and the first analog-to-digital conversion input port 35 of PMIC unit 201 and the second analog-to-digital conversion input port 36 of PMIC unit 201, for the charging current of the voltage or battery 207 that detect battery 207, namely detect charging current and detect the voltage at resistance 209 two ends or the electric current that charging current detects resistance 209 is flow through in detection.Wherein, charging current detects resistance 209 and is series between the negative electrode of diode 206 and the positive pole of battery 207, and the second analog-to-digital conversion input port 36 that the node 33 that diode 206 and charging current detect resistance 209 is connected the first analog-to-digital conversion input port 35, PMIC unit 201 of PMIC unit 201 connects the positive pole of battery 207.
The operation principle of the present embodiment is: because P ditch metal-oxide-semiconductor adopts common source connection, i.e. the drain electrode 23 of the universal input output 20 control P ditch metal-oxide-semiconductor of PMIC unit 201.According to closed loop principle, if the universal input output 20 of PMIC unit 201 is positive electrical polarity, then the drain electrode 23 of P ditch metal-oxide-semiconductor is negative electricity polarity.And N ditch metal-oxide-semiconductor adopts common drain connection, namely the polarity of voltage of the source electrode 30 of N ditch metal-oxide-semiconductor follows the polarity of voltage of its grid 28.
Therefore, the universal input output 20 supposing PMIC unit 201 is positive electrical polarity, then the drain electrode 23 of P ditch metal-oxide-semiconductor is negative electricity polarity, and the grid 28 of N ditch metal-oxide-semiconductor is connected by the drain electrode 23 of filter 204 with P ditch metal-oxide-semiconductor, the grid 28 of N ditch metal-oxide-semiconductor is made also to be negative polarity, therefore the source electrode 30 of N ditch metal-oxide-semiconductor is negative polarity, the requirement of coincident circuit.
When user inserts charger, the high pressure of a transient state can be produced at power input 202.The universal input output 20 of PMIC unit 201 is powered by power input 202, be 0V at the voltage of power input 202, when namely not charging, the voltage of the universal input output 20 of PMIC unit 201 is 0V, but when charger inserts instantaneously, the voltage of the universal input output 20 of PMIC unit 201 is still 0V, so the conducting of P ditch metal-oxide-semiconductor.Now the transient voltage of power input 202 can by P ditch metal-oxide-semiconductor to low pass filter 204, this transient voltage is low-pass filtered the first resistance 210 and the first electric capacity 211 filtering in device 204, therefore the voltage of the grid 28 of N ditch metal-oxide-semiconductor is 0V, and the voltage of namely following the source electrode 30 of the N ditch metal-oxide-semiconductor of grid 28 polarity of voltage is also 0V.Therefore the circuit of the first analog-to-digital conversion input port 35 of interior of mobile phone PMIC unit and the second analog-to-digital conversion input port 36 correspondence of PMIC unit is protected.
Refer to Fig. 2, Fig. 2 is the circuit diagram with the charging circuit of transient suppression voltage function of another embodiment of the present invention, as shown in Figure 2, the charging circuit 400 in the present embodiment comprises: PMIC unit 401, power input 402, first switching tube 403, low pass filter 404, second switch pipe 405, diode 406, battery 407 and charging current detect resistance 408.
Charging circuit 400 in the present embodiment is with the main distinction of the charging circuit 200 shown in Fig. 1, and the position that diode is arranged is not identical.
Particularly, in the present embodiment, the control pole of the first switching tube 403 is connected with a universal input output of PMIC unit 401, and the input pole 42 of the first switching tube 403 is connected with power input 402, and the output stage of the first switching tube 403 is connected with the input of low pass filter 404.
The control pole of second switch pipe 405 connects the output of low pass filter 404, and the input pole 49 of second switch pipe 405 connects the negative electrode of diode 406, and the output stage of second switch pipe 405 couples the positive pole of battery 407.
In the present embodiment, the first switching tube 403 is preferably P ditch metal-oxide-semiconductor, wherein, and the grid of the control of the first switching tube 403 very P ditch metal-oxide-semiconductor, the source electrode of the input of the first switching tube 403 very P ditch metal-oxide-semiconductor, the drain electrode of the output of the first switching tube 403 very P ditch MOS.Second switch pipe 405 is preferably N ditch metal-oxide-semiconductor, wherein, and the grid of the control of second switch pipe 405 very N ditch metal-oxide-semiconductor, the drain electrode of the input of second switch pipe 405 very N ditch metal-oxide-semiconductor, the source electrode of the output of second switch pipe 405 very N ditch MOS.
In the present embodiment, the anode of diode 406, the input pole 42 of the first switching tube 403 and power input 402 three are in parallel, and the negative electrode of diode 406 is connected with the input pole 49 of second switch pipe 405.
In the present embodiment, low pass filter 404 is single order RC filter, and it comprises the first resistance 409 and the first electric capacity 410, also comprises the second resistance 411 between low pass filter 404 and N ditch metal-oxide-semiconductor, misleads in order to prevent N ditch metal-oxide-semiconductor.Wherein, the first end of the first resistance 409 connects the drain electrode of P ditch MOS, second end of the first resistance 409, the first end of the first electric capacity 410, the first end of the second resistance 411 and the gate connected in parallel of N ditch MOS, the second end of the first electric capacity 410 and the second end ground connection of the second resistance 411.
In the present embodiment, PMIC unit 401 comprises at least one analog-to-digital conversion input port, for detecting voltage or the charging current of battery 407.
Charging current detects resistance 408 and is series between the source electrode of N ditch metal-oxide-semiconductor and battery 407 positive pole, and the node that the source electrode of N ditch metal-oxide-semiconductor and charging current detect resistance 408 is connected the first analog-to-digital conversion input port of PMIC unit 401, the second analog-to-digital conversion input port of PMIC unit 401 connects battery 407 positive pole.
In the present embodiment, the operation principle of charging circuit 400 is identical with the charging circuit 200 described in Fig. 1, does not repeat them here.
Further, the present invention also provides a kind of mobile phone, and described mobile phone comprises any one charging circuit 200,400 aforesaid, effectively to suppress the high voltage transient produced when charger inserts, and protection interior of mobile phone circuit.
In sum; charging circuit of the present invention is by increasing N ditch metal-oxide-semiconductor and low pass filter; wherein; low pass filter is connected with N ditch metal-oxide-semiconductor; the high pressure of moment can be produced when charger inserts; this high pressure by after low pass filter by filtering; thus reduce the voltage of the control end by N ditch metal-oxide-semiconductor; and then the circuit that the second analog-to-digital conversion input port protecting the first analog-to-digital conversion input port of interior of mobile phone PMIC unit and PMIC unit is corresponding, restrained effectively the high voltage transient produced when charger inserts.
The foregoing is only embodiments of the invention; not thereby the scope of the claims of the present invention is limited; every utilize specification of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (7)
1. there is a charging circuit for transient suppression voltage function, it is characterized in that, comprise power input, PMIC unit, the first switching tube, second switch pipe, low pass filter, diode and battery;
Wherein, the control pole of described first switching tube is connected with a universal input output of described PMIC unit, and the input pole of described first switching tube is connected with described power input, and the output stage of described first switching tube is connected with the input of described low pass filter;
The control pole of described second switch pipe connects the output of described low pass filter, the input pole of described second switch pipe is extremely in parallel with the input of described first switching tube, the output stage of described second switch pipe connects the anode of described diode, and the negative electrode of described diode couples the positive pole of described battery;
Described PMIC unit also comprises at least one analog-to-digital conversion input port, for the charging current of the voltage or described battery that detect described battery;
Wherein, described first switching tube is P ditch metal-oxide-semiconductor, the grid of the control of described first switching tube very P ditch metal-oxide-semiconductor, the source electrode of the input of described first switching tube very P ditch metal-oxide-semiconductor, the drain electrode of the output of described first switching tube very P ditch metal-oxide-semiconductor;
Described second switch pipe is N ditch metal-oxide-semiconductor, the grid of the control of described second switch pipe very N ditch metal-oxide-semiconductor, the drain electrode of the input of described second switch pipe very N ditch metal-oxide-semiconductor, the source electrode of the output of described second switch pipe very N ditch metal-oxide-semiconductor;
Wherein, described P ditch metal-oxide-semiconductor adopts common source connection, described N ditch metal-oxide-semiconductor adopts common drain connection, the described universal input output of described PMIC unit is powered by described power input, when user inserts charger, a high voltage transient can be produced at described power input, now the voltage of the described universal input output of described PMIC unit is still 0V, so the conducting of P ditch metal-oxide-semiconductor, the transient voltage of described power input passes through described P ditch metal-oxide-semiconductor to described low pass filter, and by described low pass filter filtering, the voltage making the grid of described N ditch metal-oxide-semiconductor is 0V, and follow the polarity of voltage of the grid of described N ditch metal-oxide-semiconductor due to the source electrode of described N ditch metal-oxide-semiconductor, and then the voltage of source electrode making described N ditch metal-oxide-semiconductor is also 0V.
2. circuit according to claim 1, it is characterized in that, described low pass filter is single order RC filter, it comprises the first resistance and the first electric capacity, one second resistance is also comprised between described low pass filter and described N ditch metal-oxide-semiconductor, wherein, the first end of described first resistance connects the drain electrode of described P ditch metal-oxide-semiconductor, the first end of the second end of described first resistance, the first end of described first electric capacity, described second resistance and the gate connected in parallel of described N ditch metal-oxide-semiconductor, the second end of described first electric capacity and the second end ground connection of described second resistance.
3. circuit according to claim 1, it is characterized in that, described circuit comprises a charging current further and detects resistance, described charging current detects resistant series between described diode cathode and described anode, and the node that described diode and described charging current detect resistance is connected the first analog-to-digital conversion input port of described PMIC unit; Second analog-to-digital conversion input port of described PMIC unit connects described anode.
4. have a charging circuit for transient suppression voltage function, it is characterized in that, described circuit comprises power input, PMIC unit, the first switching tube, second switch pipe, low pass filter, diode and battery;
Wherein, the control pole of described first switching tube is connected with a universal input output of described PMIC unit, and the input pole of described first switching tube is connected with described power input, and the output stage of described first switching tube is connected with the input of described low pass filter;
The control pole of described second switch pipe connects the output of described low pass filter, and the input pole of described second switch pipe connects the negative electrode of described diode, and the output stage of described second switch pipe couples the positive pole of described battery;
The anode of described diode, the input pole of described first switching tube and described power input three are in parallel; And
Described PMIC unit also comprises at least one analog-to-digital conversion input port, for the charging current of the voltage or described battery that detect described battery;
Wherein, described first switching tube is P ditch metal-oxide-semiconductor, the grid of the control of described first switching tube very P ditch metal-oxide-semiconductor, the source electrode of the input of described first switching tube very P ditch metal-oxide-semiconductor, the drain electrode of the output of described first switching tube very P ditch metal-oxide-semiconductor;
Described second switch pipe is N ditch metal-oxide-semiconductor, the grid of the control of described second switch pipe very N ditch metal-oxide-semiconductor, the drain electrode of the input of described second switch pipe very N ditch metal-oxide-semiconductor, the source electrode of the output of described second switch pipe very N ditch metal-oxide-semiconductor;
Wherein, described P ditch metal-oxide-semiconductor adopts common source connection, described N ditch metal-oxide-semiconductor adopts common drain connection, the described universal input output of described PMIC unit is powered by described power input, when user inserts charger, a high voltage transient can be produced at described power input, now the voltage of the described universal input output of described PMIC unit is still 0V, so the conducting of P ditch metal-oxide-semiconductor, the transient voltage of described power input passes through described P ditch metal-oxide-semiconductor to described low pass filter, and by described low pass filter filtering, the voltage making the grid of described N ditch metal-oxide-semiconductor is 0V, and follow the polarity of voltage of the grid of described N ditch metal-oxide-semiconductor due to the source electrode of described N ditch metal-oxide-semiconductor, and then the voltage of source electrode making described N ditch metal-oxide-semiconductor is also 0V.
5. circuit according to claim 4, it is characterized in that, described low pass filter is single order RC filter, it comprises the first resistance and the first electric capacity, one second resistance is also comprised between described low pass filter and described N ditch metal-oxide-semiconductor, wherein, the first end of described first resistance connects the drain electrode of described P ditch metal-oxide-semiconductor, the first end of the second end of described first resistance, the first end of described first electric capacity, described second resistance and the gate connected in parallel of described N ditch metal-oxide-semiconductor, the second end of described first electric capacity and the second end ground connection of described second resistance.
6. circuit according to claim 4, it is characterized in that, described circuit comprises a charging current further and detects resistance, described charging current detects resistant series between the source electrode and described anode of described N ditch metal-oxide-semiconductor, and the node that the source electrode of described N ditch metal-oxide-semiconductor and described charging current detect resistance is connected the first analog-to-digital conversion input port of described PMIC unit; Second analog-to-digital conversion input port of described PMIC unit connects described anode.
7. a mobile phone, is characterized in that, it comprises the charging circuit with transient suppression voltage function according to any one of claim 1 ~ 6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210053458.4A CN102611154B (en) | 2012-03-02 | 2012-03-02 | Charging circuit with function of inhibiting transient voltage and mobile phone with charging circuit |
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| CN201210053458.4A CN102611154B (en) | 2012-03-02 | 2012-03-02 | Charging circuit with function of inhibiting transient voltage and mobile phone with charging circuit |
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| CN102611154B true CN102611154B (en) | 2015-07-15 |
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| CN104701946A (en) * | 2015-03-25 | 2015-06-10 | 黎凯华 | Surge protection circuit of mobile phone |
| CN105071476A (en) * | 2015-08-14 | 2015-11-18 | 惠州Tcl移动通信有限公司 | Electronic device based on solar energy charging and method for regulating brightness of screen |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102035169A (en) * | 2009-09-28 | 2011-04-27 | 研祥智能科技股份有限公司 | Input overvoltage protection circuit and DC-DC power supply conversion device |
| CN102196071A (en) * | 2010-07-30 | 2011-09-21 | 惠州Tcl移动通信有限公司 | Mobile terminal |
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| JP3228672B2 (en) * | 1996-02-15 | 2001-11-12 | オリジン電気株式会社 | DC-DC converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102035169A (en) * | 2009-09-28 | 2011-04-27 | 研祥智能科技股份有限公司 | Input overvoltage protection circuit and DC-DC power supply conversion device |
| CN102196071A (en) * | 2010-07-30 | 2011-09-21 | 惠州Tcl移动通信有限公司 | Mobile terminal |
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Granted publication date: 20150715 |