CN202363936U - Terminal charging protection circuit - Google Patents
Terminal charging protection circuit Download PDFInfo
- Publication number
- CN202363936U CN202363936U CN2011204838842U CN201120483884U CN202363936U CN 202363936 U CN202363936 U CN 202363936U CN 2011204838842 U CN2011204838842 U CN 2011204838842U CN 201120483884 U CN201120483884 U CN 201120483884U CN 202363936 U CN202363936 U CN 202363936U
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- charging port
- charging
- pmos
- terminal
- resistance
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present utility model discloses a terminal charging protection circuit. The terminal charging protection circuit comprises: a drain electrode of a first PMOS transistor is connected with a first charging port, a substrate of the first PMOS transistor is connected with a source electrode of the first PMOS transistor, the source electrode is connected with a terminal internal charging end, a grid electrode of the first PMOS transistor is connected with a second charging port; a drain electrode of a second PMOS transistor is connected with the second charging port, a substrate of the second PMOS transistor is connected with a source electrode of the second PMOS transistor, the source electrode is connected with the terminal internal charging end, a grid electrode of the second PMOS transistor is connected with the first charging port; the first charging port is connected with one end of a first resistor, the other end of the first resistor is connected with the ground, the second charging port is connected with one end of a second resistor, the other end of the second resistor is connected with the ground, the terminal internal charging end is connected with one end of a third resistor, and the other end of the third resistor is connected with the ground.
Description
Technical field
The utility model relates to electronic applications, particularly relates to a kind of terminal charge protective circuit.
Background technology
Along with popularizing gradually of development of Communication Technique and mobile phone, the charging modes of mobile phone is more and more.A mobile phone possibly supported multiple charging modes simultaneously, for example, and through the charger charging, through the charging of USB (Universal Serial BUS abbreviates USB as) port, seat charging, onboard charger charging etc.Design reduces cost for ease, and some mobile phones are designed to a multiplexing port (for example, the USB mouth) with many charging ports, and mobile phone only need pass through a power line (for example, the USB line), can realize the compatibility to some chargings source.Under this mode because different charging modes all adopts same port, easily this charging port is damaged, and uses sometimes and be not easily, especially use be seat fill and onboard charger in.Therefore in the mobile phone of majority, still vehicle-mounted charge port, seat are filled port and separate design with USB port, improve the quality and the user experience of product.
When same mobile phone has two charging ports, can there be following problem: if 1 two charging end voltages are different, the problem that can cause existing electric current to pour in down a chimney between the charger or irritate mutually; 2, connect inverse time when the positive and negative polarity in charging source, charge protector can not be protected mobile phone automatically and make its damage.For addressing the above problem; Prior art is employed in series diode on the path that respectively charges usually, and Fig. 1 is the sketch map of anti-back flow circuit in the prior art, and is as shown in Figure 1; Wherein USB_VBUS_CON is the charging port when connecing charger or computer; CARKIT_CHG is the vehicle-mounted charge port, and VCHG is the terminal inner charging end, and charge protector as shown in Figure 1 utilizes the unidirectional conduction of diode to realize preventing that electric current from pouring in down a chimney and the defencive function during positive and negative anti-the inserting in charging source.
There is following technical problem in such scheme: 1, the existence because of pressure drop makes that there is the problem that is not fully filled in battery of mobile phone voltage under certain occasion during diode current flow.For example: outer handset is through the charging of USB charging end, and its scope is 4.75V～5.25V.Suppose that diode drop is 0.3V, then actual charging voltage V to baseband chip
CHGBe 4.45V～4.95V.And the battery behavior requirement, battery will be full of, V
CHGMinimum voltage is V
MAXSEL+ 0.5V, wherein, V
MAXSELMagnitude of voltage when being full of for battery (representative value is 4.2V) promptly, requires V
CHGMust be greater than 4.7V.Therefore the existence of diode drop makes that battery can not be full of when USB charging end voltage was lower than 5V, influences the useful life of battery.2, the reverse leakage current of diode is bigger, if external source connects inverse time, diode reverse pressure reduction makes reverse leakage current excessive too greatly, will cause damaging external charger.3, the existence of pressure drop on the diode makes in the process of charging, and own loss is bigger, and charge efficiency reduces.
The utility model content
The utility model provides a kind of terminal charge protective circuit, to prevent between terminal and the charger that electric current pours in down a chimney and the terminal to be damaged when preventing charge power supply instead to insert.
The utility model provides a kind of terminal charge protective circuit, comprising:
The first P-type mos field effect (Positive Channel Metal Oxide Semiconductor; Abbreviating PMOS as) transistor drain connects first charging port; The transistorized substrate of the one PMOS is connected to the transistorized source electrode of a PMOS; This source electrode connecting terminal charge inside end, the transistorized grid of a PMOS is connected to second charging port;
The 2nd PMOS transistor drain connects second charging port, and the transistorized substrate of the 2nd PMOS is connected to the source electrode of the 2nd PMOS, this source electrode connecting terminal charge inside end, and the transistorized grid of the 2nd PMOS is connected to first charging port;
First charging port is connected to an end of first resistance; The other end ground connection of first resistance, second charging port are connected to an end of second resistance, the other end ground connection of second resistance; The terminal inner charging end is connected to an end of the 3rd resistance, the other end ground connection of the 3rd resistance.
Preferably, the transistorized grid of a PMOS is connected to second charging port through the 4th resistance.
Preferably, the transistorized grid of the 2nd PMOS is connected to first charging port through the 5th resistance.
Preferably, first charging port is one of following: general-purpose serial bus USB charging port, vehicle-mounted charge port, charger charging port.
Preferably, second charging port is one of following: general-purpose serial bus USB charging port, vehicle-mounted charge port, charger charging port.
The utility model beneficial effect is following:
Through adopting the PMOS pipe to replace diode; Solved the problem that electric current pours in down a chimney and charge power supply is instead inserted between the different charge power supplies at terminal in the prior art; No current pours in down a chimney phenomenon in the time of can guaranteeing to have at the terminal a plurality of charge power supplies charging, and self-protection can be carried out in the terminal when power supply is instead inserted, in addition; Also make end cell under various chargings source, can both be full of electric weight; Strengthen the fail safe of terminal charge, increased the useful life and the user experience of battery, improved the competitiveness of product in market.
Description of drawings
Fig. 1 is the sketch map of anti-back flow circuit in the prior art;
Fig. 2 is the structural representation of the terminal charge protective circuit of the utility model embodiment;
Fig. 3 is the preferred structure sketch map of the terminal charge protective circuit of the utility model embodiment.
Embodiment
In order to solve the problem that electric current pours in down a chimney and charge power supply is instead inserted between the terminal and charger in the prior art, the utility model provides a kind of terminal charge protective circuit, below in conjunction with accompanying drawing and embodiment, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, does not limit the utility model.
Embodiment according to the utility model; A kind of terminal charge protective circuit is provided; Fig. 2 is the structural representation of the terminal charge protective circuit of the utility model embodiment; As shown in Figure 2; Terminal charge protective circuit according to the utility model embodiment comprises: a PMOS transistor 20, first charging port 21, terminal inner charging end 22, second charging port 23, the 2nd PMOS transistor 24, first resistance 25, second resistance 26 and the 3rd resistance 27; Wherein, comprise in the PMOS transistor 20 in parasitic first body diode, the 2nd PMOS transistor 24 comprising parasitic second body diode, below each module of the utility model embodiment is carried out detailed explanation.
Particularly; The drain electrode of the one PMOS transistor 20 connects first charging port 21; The substrate of the one PMOS transistor 20 is connected to the source electrode of a PMOS transistor 20, and the grid of these source electrode connecting terminal charge inside end 22, the one PMOS transistors 20 is connected to second charging port 23;
Preferably, the grid of a PMOS transistor 20 can be the grid of protection the one PMOS transistor 20 through the effect that the 4th resistance is connected to second charging port, 23, the four resistance.
The substrate that the drain electrode of the 2nd PMOS transistor 24 connects second charging port, 23, the two PMOS transistors 24 is connected to the source electrode of the 2nd PMOS, and the grid of these source electrode connecting terminal charge inside end 22, the two PMOS transistors 24 is connected to first charging port 21;
Preferably, the grid of the 2nd PMOS transistor 24 can be the grid of protection the 2nd PMOS transistor 24 through the effect that the 5th resistance is connected to first charging port, 21, the five resistance.
First charging port 21 is connected to an end of first resistance 25; The other end ground connection of first resistance 25; Second charging port 23 is connected to an end of second resistance 26; The other end ground connection of second resistance 26, terminal inner charging end 22 are connected to an end of the 3rd resistance 27, the other end ground connection of the 3rd resistance 27.
Need to prove that first charging port 21 can be charging ports such as general-purpose serial bus USB charging port, vehicle-mounted charge port, charger charging port.Second charging port 23 can be charging ports such as general-purpose serial bus USB charging port, vehicle-mounted charge port, charger charging port.
Need to prove that the terminal of above-mentioned terminal charge protective circuit can be the terminal that 2 ports of any needs charge.
Be example with the mobile phone below, the utility model technique scheme is illustrated.
Add a PMOS pipe respectively in two charging ends of mobile phone, source end and drain terminal pressure drop are almost 0 characteristic when utilizing its conducting, and mobile phone charge inside signal VCHG voltage is equated with the voltage of external charging source output, realize battery is full of.The conducting of one of them PMOS pipe and shutoff are by another charging end voltage control; And the parasitic diode that guarantees two PMOS is state back-to-back, prevent two anti-fillings of charging port electric current to occur when PMOS from closing, and external power source is when instead inserting; Has the autoprotection function; Fig. 3 is the preferred structure sketch map of the terminal charge protective circuit of the utility model embodiment, and is as shown in Figure 3, and USB_VBUS_CON is the charging port when connecing charger or computer; CARKIT_CHG is the vehicle-mounted charge port, and VCHG is a mobile phone charge inside end.PMOS1 and PMOS2 are 2 PMOS pipes, and R1, R2, R3, R4, R5 are resistance, and D3, D4 are respectively the parasitic diode of PMOS1 and PMOS2.PMOS1 is connected VCHG with the PMOS2 substrate electric potential, and then its parasitic diode D3, D4 are in state back-to-back.The grid of PMOS1 is connected to CARKIT_CHG through R3, and the grid of PMOS2 is connected to USB_VBUS_CON through R2.Below charge protection divides several kinds:
Situation 1 when only inserting charger or computer, makes the PMOS1 switch conduction USB_VBUS_CON voltage to reach the VCHG end, and the two voltage almost equal (pressure drop is less), thereby guarantees that battery can be full of; The PMOS2 switch is broken off, do not have path between USB_VBUS_CON and the CARKIT_CHG, thereby do not have pouring in down a chimney of electric current;
Situation 2 when only inserting onboard charger CARKIT_CHG, the PMOS2 switch conduction is made CARKIT_CHG voltage reach the VCHG end, and the two voltage is almost equal, guarantees that battery can be full of; This moment, the PMOS1 switch broke off, and did not also have path between USB_VBUS_CON and the CARKIT_CHG, thereby did not have pouring in down a chimney of electric current;
Situation 3; When all plug two kinds of charging ends, two PMOS to be closed simultaneously, charge to battery through the PMOS parasitic diode in two charging ends; Two diodes are in state back-to-back; Can prevent that also the electric current between USB_VBUS_CON and the CARKIT_CHG from irritating mutually, can not guarantee that battery is full of, and should explain this moment usually on the mobile phone specification.
Equally, when anti-inserting appears in one of external charging end, make negative voltage can not transfer to inner VCHG end thereby PMOS broken off, thus the protection when realizing the mobile phone charge power supply instead inserted.
Need to prove that do not allow outside two charging ends all instead to insert, this situation can not realize the protection to mobile phone, in practical application, need be explained on cellphone subscriber's specification.
The utility model adopts the PMOS pipe to replace the diode in the existing scheme; When keeping original anti-charge power supply instead to insert irritating function mutually with electric current; Reduced the pressure drop above the original diode; Guarantee that battery of mobile phone can be full of under various situation, reduced the power loss of diode self simultaneously, improved the efficient of charging; And adopt the PMOS pipe, when gate source voltage difference Vgs was 0, leakage current was the nA level, and is littler than diode reverse leakage current (being generally 200uA), more can protect the safety of charger.
Below to be example with the mobile phone instead insert the course of work and further be elaborated the anti-course of work and the anti-power supply of pouring in down a chimney of the terminal charge protective circuit of the utility model embodiment.
1, the anti-course of work of pouring in down a chimney:
When USB_VBUS_CON connect charger or computer (mobile phone does not insert onboard charger), the grid of PMOS1 was CARKIT_CHG (being pulled down to GND by R3, R4), the PMOS1 conducting; Charge, this moment, the PMOS2 grid was a USB_VBUS_CON voltage, thereby made its shutoff; And its parasitic diode also oppositely ends; Avoided USB_VBUS_CON to pour in down a chimney, and VCHG voltage and USB_VBUS_CON are almost equal, guarantee that battery can be full of to CARKIT_CHG;
In like manner, when the CARKIT_CHG end charged (mobile phone does not insert charger or computer), PMOS1 turn-offed, the PMOS2 conducting, and D3 oppositely ends, and can prevent that also the CARKIT_CHG electric current from pouring in down a chimney to USB_VBUS_CON; VCHG voltage is CARKIT_CHG no better than, can guarantee that also battery can be full of;
When two ports are plugged and USB_VBUS_CON and CARJIT_CHG voltage equate or when close (the difference absolute value of both voltages is less than the threshold voltage of metal-oxide-semiconductor) simultaneously; PMOS1 and PMOS2 turn-off simultaneously; But parasitic diode D3 and D4 forward conduction, can charge simultaneously in two ends.If the two one of voltage less than (VMAXSEL+0.5+0.7) V, can not guarantee that then battery is full of, should indicate this point on the mobile phone specification, and the suggestion user often do not make in this way.
When two ports are plugged simultaneously; The absolute value of unequal and both pressure reduction of USB_VBUS_CON and CARKIT_CHG voltage is during greater than the threshold voltage of metal-oxide-semiconductor, the corresponding PMOS pipe conducting of an end that voltage is higher, and charge: for example; USB_VBUS_CON voltage is higher; The PMOS1 conducting, not conducting of PMOS2, thus prevent that electric current from flowing to CATKIT_CHG from USB_VBUS_CON; CARKIT_CHG voltage is higher, not conducting of PMOS1, and the PMOS2 conducting, thus prevent that electric current from flowing to USB_VBUS_CON from CARKIT_CHG.Table 1 is the anti-checking result that pours in down a chimney.
Table 1
2, anti-power supply is instead inserted process:
Table 2 is inserted the checking result for counnter attack.
Table 2
As shown in table 2, as USB_VBUS_CON during for-5V (mobile phone is not inserted onboard charger): the grid of PMOS1 and source voltage are 0V (pressure reduction between grid and the source electrode is 0V), the PMOS1 shutoff; The PMOS2 grid is-5V, and source electrode is 0V, and the protective effect of power supply when anti-slotting played in PMOS2 conducting, but because CARKIT_CHG is 0V, so VCHG is 0V, negative pressure can't occur.
In like manner, when CARKIT_CHG be-during 5V, the PMOS1 conducting, PMOS2 closes, USB_VBUS_CON is 0V, thus VCHG is 0V, can appearance of negative voltage yet, the protective effect in the time of also playing power supply and instead insert.
When USB_VBUS_CON is-5V; CARKIT_CHG is during also for-5V (charger is instead inserted and onboard charger is also instead inserted), and this moment, the gate pmos utmost point was with drain potential-5V (be equivalent to grid, leakage is connected together), so VCHG is-4.5V; Can damage mobile phone this moment; So this situation belongs to gross error, should inform and the user be sure not to occur the situation of all instead inserting in two charging sources (probability that this in actual use situation occurs is very low, can occur hardly; So safeguard procedures that it goes without doing are just explained in order comprehensively to consider) here.
Through adopting the PMOS pipe to replace the diode in the existing scheme; Solved the problem that electric current pours in down a chimney and charge power supply is instead inserted between the terminal and charger in the prior art; No current pours in down a chimney phenomenon in the time of can guaranteeing to have at the terminal a plurality of charge power supplies charging, and self-protection can be carried out in the terminal when power supply is instead inserted, in addition; Also make end cell under various chargings source, can both be full of; Strengthen the fail safe of terminal charge, increased the useful life and the user experience of battery, improved the competitiveness of product in market.
Although be the example purpose, the preferred embodiment of the utility model is disclosed, it also is possible those skilled in the art will recognize various improvement, increase and replacement, therefore, the scope of the utility model should be not limited to the foregoing description.
Claims (5)
1. a terminal charge protective circuit is characterized in that, comprising:
The first P-type mos field effect PMOS transistor drain connects said first charging port; The transistorized substrate of a said PMOS is connected to the transistorized source electrode of a said PMOS; This source electrode connects said terminal inner charging end, and the transistorized grid of a said PMOS is connected to said second charging port;
The 2nd PMOS transistor drain connects said second charging port; The transistorized substrate of said the 2nd PMOS is connected to the source electrode of said the 2nd PMOS; This source electrode connects said terminal inner charging end, and the transistorized grid of said the 2nd PMOS is connected to said first charging port;
Said first charging port is connected to an end of first resistance; The other end ground connection of said first resistance; Said second charging port is connected to an end of second resistance; The other end ground connection of said second resistance, said terminal inner charging end is connected to an end of the 3rd resistance, the other end ground connection of said the 3rd resistance.
2. terminal charge protective circuit as claimed in claim 1 is characterized in that, the transistorized grid of a said PMOS is connected to said second charging port through the 4th resistance.
3. terminal charge protective circuit as claimed in claim 1 is characterized in that, the transistorized grid of said the 2nd PMOS is connected to said first charging port through the 5th resistance.
4. terminal charge protective circuit as claimed in claim 1 is characterized in that, said first charging port is one of following: general-purpose serial bus USB charging port, vehicle-mounted charge port, charger charging port.
5. terminal charge protective circuit as claimed in claim 1 is characterized in that, said second charging port is one of following: general-purpose serial bus USB charging port, vehicle-mounted charge port, charger charging port.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204838842U CN202363936U (en) | 2011-11-29 | 2011-11-29 | Terminal charging protection circuit |
| PCT/CN2012/076731 WO2013078848A1 (en) | 2011-11-29 | 2012-06-11 | Terminal charging protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204838842U CN202363936U (en) | 2011-11-29 | 2011-11-29 | Terminal charging protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202363936U true CN202363936U (en) | 2012-08-01 |
Family
ID=46575092
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204838842U Expired - Fee Related CN202363936U (en) | 2011-11-29 | 2011-11-29 | Terminal charging protection circuit |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN202363936U (en) |
| WO (1) | WO2013078848A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013167060A2 (en) * | 2013-03-04 | 2013-11-14 | 中兴通讯股份有限公司 | Charging protection device for intelligent terminal and intelligent terminal |
| CN104467055A (en) * | 2013-09-24 | 2015-03-25 | 中兴通讯股份有限公司 | Power supply protection device |
| CN108964188A (en) * | 2018-07-24 | 2018-12-07 | 努比亚技术有限公司 | A kind of mobile terminal charging control circuit, charging circuit and electronic equipment |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109831020B (en) * | 2019-02-20 | 2024-05-24 | 奥格科技股份有限公司 | Reverse flow preventing circuit for ultralow-loss two-path power supply switching |
| CN113872272A (en) * | 2021-09-14 | 2021-12-31 | 无锡英迪芯微电子科技股份有限公司 | High-performance standby battery charging circuit |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101316044B (en) * | 2007-05-31 | 2011-12-21 | 扬智科技股份有限公司 | Charging device capable of providing backward current and inrush current protection |
| US7884587B2 (en) * | 2007-08-07 | 2011-02-08 | Ricoh Company, Limited | Power supply device and image forming apparatus |
| JP2010130742A (en) * | 2008-11-26 | 2010-06-10 | Kyocera Corp | Reverse current prevention circuit |
| CN101640404A (en) * | 2009-05-19 | 2010-02-03 | 上海闻泰电子科技有限公司 | Mobile phone charging protection circuit |
| CN101567556B (en) * | 2009-05-26 | 2012-12-05 | 上海华勤通讯技术有限公司 | Over-voltage charge protective device and method used for charging cell phone |
| CN201975805U (en) * | 2010-10-19 | 2011-09-14 | 邵子效 | Multisource mobile phone-charging emergent charger |
-
2011
- 2011-11-29 CN CN2011204838842U patent/CN202363936U/en not_active Expired - Fee Related
-
2012
- 2012-06-11 WO PCT/CN2012/076731 patent/WO2013078848A1/en active Application Filing
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013167060A2 (en) * | 2013-03-04 | 2013-11-14 | 中兴通讯股份有限公司 | Charging protection device for intelligent terminal and intelligent terminal |
| WO2013167060A3 (en) * | 2013-03-04 | 2014-02-06 | 中兴通讯股份有限公司 | Charging protection device for intelligent terminal and intelligent terminal |
| CN104037734B (en) * | 2013-03-04 | 2017-04-26 | 中兴通讯股份有限公司 | Charging protection device for intelligent terminal, and intelligent terminal |
| CN104467055A (en) * | 2013-09-24 | 2015-03-25 | 中兴通讯股份有限公司 | Power supply protection device |
| CN108964188A (en) * | 2018-07-24 | 2018-12-07 | 努比亚技术有限公司 | A kind of mobile terminal charging control circuit, charging circuit and electronic equipment |
| CN108964188B (en) * | 2018-07-24 | 2020-12-18 | 南京车链科技有限公司 | Mobile terminal charging control circuit, charging circuit and electronic equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2013078848A1 (en) | 2013-06-06 |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120801 Termination date: 20161129 |