CN100541526C - Near-field communications terminal supply unit and method - Google Patents
Near-field communications terminal supply unit and method Download PDFInfo
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- CN100541526C CN100541526C CNB2007101704825A CN200710170482A CN100541526C CN 100541526 C CN100541526 C CN 100541526C CN B2007101704825 A CNB2007101704825 A CN B2007101704825A CN 200710170482 A CN200710170482 A CN 200710170482A CN 100541526 C CN100541526 C CN 100541526C
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Abstract
The present invention relates to a kind of near-field communications terminal supply unit and method, comprise non-contact front-end chip, baseband chip, safety chip, Subscriber Identity Module, read write line, antenna, low pressure difference linear voltage regulator, Power Management Unit and battery, gauge tap and battery voltage detection circuit; It is characterized in that: above-mentioned non-contact front-end chip comprises RF rectification circuit, external field testing circuit and non-contact front-end aftertreatment part, the present invention mainly is under the state of mobile phone shutdown, remaining capacity and external field by battery detect the mode that combines, be the terminal power supply, make terminal can the normal running non-contact card function of simulation, make full use of the remaining capacity of its end cell, improved the effective rate of utilization of battery, the burden that it has avoided the user must carry reserve battery whenever and wherever possible, also the while has been reduced the use cost of this terminal virtually.
Description
Technical field
The present invention relates to a kind of communications terminal supply unit and method, be specifically related to a kind of near-field communication (NearField Communicat ion, NFC) terminal electric supply installation and method.
Background technology
In recent years, pay by mails and professionally to have goed deep into our life, brought many facilities, particularly in fixing place of business to us, (Integrated Circuit, IC) Ka E-Payment business has formed proven technique and stable market based on integrated circuit.Since 2006,, become present focus based on the mobile payment service of mobile phone and mobile communication platform along with near-field communication technology popularization.This emerging market of near-field communication has begun to start, and various solutions emerge in an endless stream.In present communications terminal supply unit, mostly just adopt powered battery, and under the situation that battery is stopped power supply, this terminal can't work on.
Shown in Figure 1 is a kind of near-field communication terminal of prior art, comprise battery 2 ', Power Management Unit 5 ' (Power Management Unit, PMU), low pressure difference linear voltage regulator 1 ', non-contact front-end chip, safety chip 11 ', baseband chip 6 ', Subscriber Identity Module 10 ', read write line 13 ' and antenna 4 '.
Above-mentioned battery 2 ' connects Power Management Unit 5 ' and low pressure difference linear voltage regulator 1 ' successively, low pressure difference linear voltage regulator 1 ' connects non-contact front-end chip, read write line 13 ', safety chip 11 ', baseband chip 6 ' and Subscriber Identity Module 10 ' respectively, is above-mentioned five module for power supply.
Above-mentioned non-contact front-end chip connects safety chip 11 ', baseband chip 6 ', Subscriber Identity Module 10 ' and antenna 4 ' respectively, and with safety chip 11 ', baseband chip 6 ', Subscriber Identity Module 10 ' bi-directional transfer of data.
Above-mentioned Subscriber Identity Module 10 ' connects baseband chip 6 ', bi-directional transfer of data.
Above-mentioned safety chip 11 ' connects read write line 13 ', bi-directional transfer of data.
Above-mentioned non-contact front-end chip is connected bi-directional transfer of data with S2C (SigIn-SigOut-Connection, the signal input and output connect) interface mode with safety chip.
Above-mentioned non-contact front-end chip is the non-contact front-end chip PN511 that NXP (grace intelligence Pu) company produces; Above-mentioned safety chip is the safety chip SmartMX that NXP company produces.
Safety chip is handled the data of non-contact application and is preserved and safety management; Non-contact front-end chip is finished the interface conversion work of S2C signal and extraneous non-contact signal, and data of using with baseband chip and instruction exchange.
In this near-field communication terminal use, after battery was consumed, the output voltage of battery progressively reduced, and when cell voltage reduces to its minimum value Vmin when following, battery damages.In order to protect battery, Power Management Unit is reduced to a certain threshold value detecting battery output, when promptly shutting down threshold value Vth, closes all termination function.Though this moment, battery still had certain remaining capacity, can't carry out any work.
So the shortcoming of its electric supply installation of this near-field communication terminal and method is:
1. existing near-field communications terminal supply unit is under the situation of manually shutdown, and battery will stop to all module for power supply, cause this terminal to work, and the less function of some power consumptions of this terminal can't work under off-mode.
2. existing near-field communications terminal supply unit is at cell voltage during less than shutdown threshold value Vth, battery will stop to all module for power supply, automatically shutdown, cause this terminal to work, some power consumptions of this terminal can't work under off-mode less than the non-contact card analog functuion of shutdown threshold value Vth.
3. can't utilize the remaining capacity of its end cell, reduce the effective rate of utilization of battery.
4. can't utilize mode such as external field detection to obtain extra power, support the less function of power consumption under off-mode, to work on.
5. increase the burden that the user must carry reserve battery whenever and wherever possible, also improved simultaneously the use cost of this terminal virtually.
This terminal power supply mode that depends on Power Management Unit unified in the mobile phone, can cause inconvenience in actual applications, for example, when near-field communication terminal uses as the subway card, the user may be after normally entering the subway gate, and battery of mobile phone is not enough and shutdown automatically, because this moment, near-field communication terminal can not be worked, the user can't finish the departures transaction, thereby can't set off.
Prior art also has a kind of power supply apparatus for handset, it comprises handset shell, rechargeable battery, in handset shell, be provided with the power supply enter conductive film, its characteristics are: place at least two rechargeable batteries in handset shell, wherein the electrode of the rechargeable battery power supply enter conductive film interior with being arranged on handset shell is connected.It has easy to carry, prolongs the mobile phone characteristics of charged service time.
This power supply apparatus for handset has also only prolonged the service time of power supply, and after shutdown, terminal still can't be carried out any work.
Summary of the invention
The purpose of this invention is to provide a kind of near-field communications terminal supply unit and method, it mainly is under the state of mobile phone shutdown, remaining capacity by battery and external field detect the mode that combines, and are the terminal power supply, make the function that terminal can the simulation of normal running non-contact card.Overcome terminal in case shutdown, the problem that the less function of power consumptions such as function of non-contact card simulation can't normally be used makes full use of the remaining capacity of its end cell, has improved the effective rate of utilization of battery.The burden that it has avoided the user must carry reserve battery whenever and wherever possible, also the while has been reduced the use cost of this terminal virtually.
The invention provides a kind of near-field communications terminal supply unit in order to achieve the above object, comprise non-contact front-end chip, low pressure difference linear voltage regulator, battery, antenna, Power Management Unit, baseband chip, Subscriber Identity Module, safety chip and read write line; It is characterized in that: also comprise battery voltage detection circuit and gauge tap, above-mentioned non-contact front-end chip comprises RF rectification circuit, external field testing circuit and non-contact front-end aftertreatment part;
The port one of above-mentioned battery voltage detection circuit connects the port 2 of baseband chip, receives the starting up of terminal status signal BB_POWER_ON that baseband chip sends;
The port 2 of above-mentioned battery voltage detection circuit connects the port one of battery, the port one of low pressure difference linear voltage regulator and the port one of Power Management Unit respectively, and battery provides operating voltage BAT_VDD to low pressure difference linear voltage regulator, Power Management Unit and battery voltage detection circuit respectively;
The port 3 of above-mentioned battery voltage detection circuit connects the port 3 of low pressure difference linear voltage regulator, and to low pressure difference linear voltage regulator transmission of control signals LDO_EN;
The port 4 of above-mentioned battery voltage detection circuit connects the port 2 of external field testing circuit, receives the control signal RF_DET that the external field testing circuit sends;
The port 5 of above-mentioned battery voltage detection circuit connects the port 5 of gauge tap, and to gauge tap transmission powering mode status signal PMOD;
Switch 8A two ends of above-mentioned gauge tap connect the port one and the port 2 of gauge tap respectively, and another switch 8B two ends of above-mentioned gauge tap connect the port 3 and the port 4 of gauge tap respectively;
Above-mentioned non-contact front-end chip obtains voltage by antenna from the external magnetic field coupling, after the rectification of RF rectification circuit, produces operating voltage CVDD;
The port one of above-mentioned gauge tap connects the port 2 of low pressure difference linear voltage regulator and the port one of read write line, and low pressure difference linear voltage regulator is the operating voltage DVDD after gauge tap and read write line transmission voltage stabilizing respectively;
The port 2 of above-mentioned gauge tap connects the port 3 of RF rectification circuit, receives the operating voltage CVDD that the RF rectification circuit provides;
The port 3 of above-mentioned gauge tap connects the port 4 that connects gauge tap respectively, port one, the port one of Subscriber Identity Module and the port one of safety chip of non-contact front-end aftertreatment part, and gauge tap provides operating voltage MVDD to non-contact front-end aftertreatment part, Subscriber Identity Module and safety chip;
The port one of above-mentioned RF rectification circuit is connected antenna ends respectively with port 2;
The port 4 of above-mentioned RF rectification circuit connects the port one of external field testing circuit;
The port 2 of above-mentioned non-contact front-end aftertreatment part connects the port 2 of Subscriber Identity Module and the port 3 of safety chip, bi-directional transfer of data respectively;
The port 2 of above-mentioned Power Management Unit connects the port one of baseband chip, and to baseband chip transmission operating voltage BB_VDD;
The port 2 of above-mentioned safety chip connects the port 2 of read write line, bi-directional transfer of data.
Above-mentioned safety chip and non-contact front-end chip are integrated into a chips, and the shutdown value of the cutting off from Vth of above-mentioned battery and the minimum value Vmin of its operate as normal are by setting in the safety chip.
A kind of near-field communication terminal method of supplying power to that uses near-field communications terminal supply unit is characterized in that, comprises following steps:
Above-mentioned steps 4 comprises following steps:
Step 4.1, effective as open state signal BB_POWER_ON, during the shutdown threshold value Vth of operating voltage BAT_VDD＞battery, the battery powered mode status signal PMOD of battery voltage detection circuit output is a battery mode
；
Step 4.2, when open state signal BB_POWER_ON invalid, the signal RF_DET of external field testing circuit output is effective, and during the minimum value Vmin of the operate as normal of operating voltage BAT_VDD＞battery, the battery powered mode status signal PMOD of battery voltage detection circuit output is a battery mode two;
Step 4.3, when open state signal BB_POWER_ON invalid, the signal RF_DET of external field testing circuit output is effective, and during the minimum value Vmin of the operate as normal of operating voltage BAT_VDD＜battery, the battery powered mode status signal PMOD of battery voltage detection circuit output is a battery mode three;
Step 4.4, when open state signal BB_POWER_ON is invalid, when the signal RF_DET of external field testing circuit output was invalid, the battery powered mode status signal PMOD of battery voltage detection circuit output was a battery mode four.
Above-mentioned step 1 comprises following steps:
Step 1.1, above-mentioned battery provide operating voltage BAT_VDD to Power Management Unit and battery voltage detection circuit;
Step 1.2, above-mentioned Power Management Unit provide operating voltage BB_VDD to baseband chip;
Step 1.3, above-mentioned baseband chip are to battery voltage detection circuit transmission terminal open state signal BB_POWER_ON.
Above-mentioned step 2 comprises following steps:
Step 2.1, execution in step 4.1 when the open state signal BB_POWER_ON that receives when above-mentioned battery voltage detection circuit is effective;
Step 2.2, execution in step 3 when the open state signal BB_POWER_ON that receives when above-mentioned battery voltage detection circuit is invalid.
Above-mentioned step 3 comprises following steps:
Step 3.1, when the mobile phone power-on status signal BB_POWER_ON of baseband chip output is invalid, promptly mobile phone is in manual or automatic off-mode, and the control signal RF_DET of external field testing circuit output is effective,
When the minimum value Vmin of the operate as normal of operating voltage BAT_VDD＞battery, execution in step 4.2;
When the minimum value Vmin of the operate as normal of operating voltage BAT_VDD＜battery, execution in step 4.3;
Step 3.2, when the mobile phone power-on status signal BB_POWER_ON of baseband chip output is invalid, promptly mobile phone is in off-mode, and the control signal RF_DET of external field testing circuit output is when invalid, execution in step 4.4.
Above-mentioned step 4.1 comprises following steps:
The battery powered mode status signal PMOD of battery voltage detection circuit output is a battery mode one:
At this moment, BB_POWER_ON is effective for the open state signal, the shutdown threshold value Vth of operating voltage BAT_VDD＞battery:
Then battery voltage detection circuit output control signal LDO_EN is effective, and low pressure difference linear voltage regulator is opened, and gauge tap is according to battery mode PMOD signal, selector switch 8A closure, and switch 8B turn-offs;
The operating voltage MVDD of non-contact front-end chip aftertreatment part, Subscriber Identity Module and safety chip and the operating voltage of read write line provide by the operating voltage DVDD of low pressure difference linear voltage regulator output.
Above-mentioned step 4.2 comprises following steps:
The battery powered mode status signal PMOD of battery voltage detection circuit output is a battery mode two:
At this moment, BB_POWER_ON is invalid for the open state signal, and the signal RF_DET of external field testing circuit output is effective, and the minimum value Vmin of the operate as normal of operating voltage BAT_VDD＞battery;
Then battery voltage detection circuit output control signal LDO_EN is effective, and low pressure difference linear voltage regulator is opened, and gauge tap is according to battery mode PMOD signal, selector switch 8A closure, and switch 8B turn-offs;
Safety chip turn-offs the higher read write line of power consumption, and read write line quits work, and the operating voltage MVDD of non-contact front-end chip aftertreatment part, Subscriber Identity Module and safety chip is provided by the operating voltage DVDD of low pressure difference linear voltage regulator output.
Above-mentioned step 4.3 comprises following steps:
The battery powered mode status signal PMOD of battery voltage detection circuit output is a battery mode three:
At this moment, BB_POWER_ON is invalid for the open state signal, and the signal RF_DET of external field testing circuit output is effective, and the minimum value Vmin of the operate as normal of operating voltage BAT_VDD＜battery;
Then battery voltage detection circuit output control signal LDO_EN is invalid, and low pressure difference linear voltage regulator is in off state, and ON-OFF control circuit is according to battery mode PMOD signal, and selector switch 8A turn-offs, switch 8B closure;
Safety chip turn-offs the higher read write line of power consumption, and read write line quits work, and the operating voltage MVDD of non-contact front-end chip aftertreatment part, Subscriber Identity Module and safety chip is provided by the operating voltage CVDD of RF rectification circuit output.
Above-mentioned step 4.4 comprises following steps:
The battery powered mode status signal PMOD of battery voltage detection circuit output is a battery mode four:
At this moment, BB_POWER_ON is invalid for the open state signal, and the signal RF_DEI of external field testing circuit output is invalid;
Then battery voltage detection circuit output control signal LDO_EN is invalid, and low pressure difference linear voltage regulator turn-offs, and ON-OFF control circuit is according to battery mode PMOD signal, and selector switch 8A turn-offs, switch 8B closure;
The operating voltage DVDD of low pressure difference linear voltage regulator output is in power-down state, and simultaneously, the operating voltage CVDD of RF rectification circuit output is in power-down state, and therefore, entire circuit is in power-down state, and MVDD does not have power supply; Safety chip, Subscriber Identity Module, read write line and non-contact front-end chip aftertreatment part all quit work.
The purpose of this invention is to provide a kind of near-field communications terminal supply unit and method, it mainly is to be in manual or automatic off-mode at mobile phone, by making the bigger read write line power down of power consumption, use the remaining capacity and the external field of battery to detect the mode that combines, be the terminal power supply, make the function that terminal can the simulation of normal running non-contact card.Make full use of the remaining capacity of its end cell, improved the effective rate of utilization of battery.The burden that it has avoided the user must carry reserve battery whenever and wherever possible, also the while has been reduced the use cost of this terminal virtually.
Description of drawings
Fig. 1 is existing near-field communications terminal supply unit circuit block diagram.
Fig. 2 is near-field communications terminal supply unit circuit theory diagrams of the present invention.
Fig. 3 is the block diagram of near-field communication terminal method of supplying power to of the present invention.
Embodiment
Provide a kind of better embodiment of the present invention below in conjunction with Fig. 2 and Fig. 3, to describe technical scheme of the present invention in detail.
As shown in Figure 2, in the present embodiment, baseband chip 6 is baseband chips of the E-GOLDPMB7880 model of Infineon company production, Subscriber Identity Module 10 is Subscriber Identity Modules of the S3FS9DG model of Samsung company production, non-contact front-end chip (being made up of RF rectification circuit 3, external field detection 12 and non-contact front-end aftertreatment part 9) and safety chip 10 are integrated on the chips, adopt the contactless CPU card chip FM1920 of Shanghai Fudan Microelectronics Co., Ltd's exploitation.Described low pressure difference linear voltage regulator adopts TI company's T PS79311.
In the various functions that terminal provides, the power consumption of non-contact card analog functuion is less, and the function power consumption that read write line is relevant is bigger.In user's actual use, under the mobile phone shutdown state, non-contact card analog functuion when the function that need use is main does not generally need to open the read write line function of initiatively concluding the business or communicating by letter.
In the present embodiment, the initial voltage of battery is 3.5V, and with increasing service time, its magnitude of voltage drops to 2.3V, and in use for some time, its magnitude of voltage drops to 1.8V; Battery shutdown threshold value Vth is 2.5V; The minimum value Vmin of battery operate as normal is 2V; Described non-contact front-end chip obtains voltage by antenna 4 from the external magnetic field coupling, and after 3 rectifications of RF rectification circuit, the generation magnitude of voltage is 2.1 volts operating voltage CVDD.
A kind of near-field communications terminal supply unit as shown in Figure 2 comprises non-contact front-end chip, low pressure difference linear voltage regulator 1, battery 2, antenna 4, Power Management Unit 5, baseband chip 6, Subscriber Identity Module 10, safety chip 11 and read write line 13; It is characterized in that: also comprise battery voltage detection circuit 7 and gauge tap 8, described non-contact front-end chip comprises RF rectification circuit 3, external field testing circuit 12 and non-contact front-end aftertreatment part 9:
The port one of described battery voltage detection circuit 7 connects the port 2 of baseband chip 6, receives the starting up of terminal status signal BB_POWER_ON that baseband chip 6 sends;
The port 2 of described battery voltage detection circuit 7 connects the port one of battery 2, the port one of low pressure difference linear voltage regulator 1 and the port one of Power Management Unit 5 respectively, and battery 2 provides operating voltage BAT_VDD to low pressure difference linear voltage regulator 1, Power Management Unit 5 and battery voltage detection circuit 7 respectively;
The port 3 of described battery voltage detection circuit 7 connects the port 3 of low pressure difference linear voltage regulator 1, and to low pressure difference linear voltage regulator 1 transmission of control signals LDO_EN;
The port 4 of described battery voltage detection circuit 7 connects the port 2 of external field testing circuit 12, receives the control signal RF_DET that external field testing circuit 12 sends;
The port 5 of described battery voltage detection circuit 7 connects the port 5 of gauge tap 8, and to gauge tap 8 transmission powering mode status signal PMOD;
The port one of described gauge tap 8 connects the port 2 of low pressure difference linear voltage regulator 1 and the port one of read write line 13, and low pressure difference linear voltage regulator 1 is the operating voltage DVDD after gauge tap 8 and read write line 13 transmission voltage stabilizings respectively;
The port 2 of described gauge tap 8 connects the port 3 of RF rectification circuit 3, receives the operating voltage CVDD that RF rectification circuit 3 provides;
The port 3 of described gauge tap 8 connects and connects the port 4 of gauge tap 8, the port one of non-contact front-end aftertreatment part 9, the port one of Subscriber Identity Module 10 and the port one of safety chip 11 respectively, and gauge tap 8 provides operating voltage MVDD to non-contact front-end aftertreatment part 9, Subscriber Identity Module 10 and safety chip 11;
The port one of described RF rectification circuit 3 is connected antenna 4 two ends respectively with port 2;
The port 4 of described RF rectification circuit 3 connects the port one of external field testing circuit 12;
The port 2 of described non-contact front-end aftertreatment part 9 connects the port 2 of Subscriber Identity Module 10 and the port 3 of safety chip 11, bi-directional transfer of data respectively;
The port 2 of described Power Management Unit 5 connects the port one of baseband chip 6, and to baseband chip 6 transmission operating voltage BB_VDD;
The port 2 of described safety chip 11 connects the port 2 of read write line 13, bi-directional transfer of data.
Described a kind of near-field communications terminal supply unit is characterized in that, described safety chip 11 and non-contact front-end chip are integrated into a chips, and the shutdown threshold value Vth of described battery 2 and the minimum value Vmin of its operate as normal are by setting in the safety chip 6.
As shown in Figure 3, in the battery use, voltage constantly descends, and near-field communications terminal supply unit of the present invention selects different method of supplying power to that it is powered.
(1). its voltage was 3.5V when battery had just begun to circuit supply, and cell voltage is greater than shutdown threshold value Vth, the terminal operate as normal, its method of supplying power to is as follows:
Step 1.1, battery 2 provide operating voltage BAT_VDD by circuit to Power Management Unit 5 and battery voltage detection circuit 7;
Step 1.2, described Power Management Unit 5 provide operating voltage BB_VDD to baseband chip 6;
Step 1.3, described baseband chip 6 are to the effective starting up of terminal status signal BB_POWER_ON of battery voltage detection circuit 7 transmission.
Execution in step 4.1 when the open state signal BB_POWER_ON that step 2.1, described battery voltage detection circuit (7) receive is effective;
The battery powered mode status signal PMOD of step 4.1, battery voltage detection circuit 7 outputs is a battery mode one:
At this moment, BB_POWER_ON is effective for the open state signal, and BAT_VDD is 3.5V, and Vth is 2.5V, BAT_VDD＞Vth:
Then battery voltage detection circuit output control signal LDO_EN is effective, low pressure difference linear voltage regulator 1 is opened, and is output as the operating voltage DVDD of 2.9V after the BAT_VDD voltage stabilizing with 3.5V, and gauge tap 8 is according to battery mode PMOD signal, selector switch 8A closure, switch 8B turn-offs;
The operating voltage MVDD of non-contact front-end chip aftertreatment part 9, Subscriber Identity Module 10 and safety chip 11 and the operating voltage of read write line 13 provide by the operating voltage DVDD of low pressure difference linear voltage regulator 1 output, and operating voltage MVDD is 2.9V.
(2). battery in use for some time, its magnitude of voltage drops to 2.3V, cell voltage is automatically shutdown less than shutdown threshold value Vth, but battery supply is greater than the minimum value Vmin of battery operate as normal.Antenna 4 can be coupled from outside card reader magnetic field and obtain voltage, after 3 rectifications of RF rectification circuit, produces operating voltage CVDD, and operating voltage CVDD equals 2.1V, and its method of supplying power to is as follows:
Step 1.1, battery 2 provide operating voltage BAT_VDD by circuit to Power Management Unit 5 and battery voltage detection circuit 7;
Step 1.2, described Power Management Unit 5 provide operating voltage BB_VDD to baseband chip 6;
Step 1.3, described baseband chip 6 are to the invalid starting up of terminal status signal BB_POWER_ON of battery voltage detection circuit 7 transmission.
The open state signal BB_POWER_ON that step 2.2, described battery voltage detection circuit (7) receive is invalid, execution in step 3.1 or 3.2.
Step 3.1, when the mobile phone power-on status signal BB_POWER_ON of baseband chip (6) output invalid, be that mobile phone is in manual or automatic off-mode, and the control signal RF_DET of external field testing circuit (12) output is effective, when the minimum value Vmin of the operate as normal of operating voltage BAT_VDD＞battery, execution in step 4.2;
The battery powered mode status signal PMOD of step 4.2, battery voltage detection circuit 7 outputs is a battery mode two:
At this moment, BB_POWER_ON is invalid for the open state signal, and the signal RF_DET of external field testing circuit 12 outputs is effective, and BAT_VDD＞Vmin;
Then battery voltage detection circuit 7 output control signal IDO_EN are effective, low pressure difference linear voltage regulator 1 is opened, and is output as the operating voltage DVDD of 2.2V after the BAT_VDD voltage stabilizing with 2.3V, and gauge tap 8 is according to battery mode PMOD signal, selector switch 8A closure, switch 8B turn-offs;
(3). battery in use for some time, its magnitude of voltage drops to 1.8V, cell voltage is less than the minimum value Vmin of battery operate as normal, terminal is shut down automatically.Antenna 4 can be coupled from outside card reader magnetic field and obtain operating voltage, after 3 rectifications of RF rectification circuit, produces operating voltage CVDD, and operating voltage CVDD equals 2.1V, and its method of supplying power to is as follows:
Step 1.1, battery 2 provide operating voltage BAT VDD by circuit to Power Management Unit 5 and battery voltage detection circuit 7;
Step 1.2, described Power Management Unit 5 provide operating voltage BB_VDD to baseband chip 6;
Step 1.3, described baseband chip 6 are to the invalid starting up of terminal status signal BB_POWER_ON of battery voltage detection circuit 7 transmission.
The open state signal BB_POWER_ON that step 2.2, described battery voltage detection circuit (7) receive is invalid, execution in step 3.1 or 3.2.
Step 3.1, when the mobile phone power-on status signal BB_POWER_ON of baseband chip (6) output invalid, be that mobile phone is in manual or automatic off-mode, and the control signal RF_DET of external field testing circuit (12) output is effective, when the minimum value Vmin of the operate as normal of operating voltage BAT_VDD＜battery, execution in step 4.3;
The battery powered mode status signal PMOD of step 4.3, battery voltage detection circuit 7 outputs is a battery mode three:
At this moment, BB_POWER_ON is invalid for the open state signal, and the signal RF_DET of external field testing circuit 12 outputs is effective, and BAT_VDD＜Vmin;
Then battery voltage detection circuit 7 output control signal LDO_EN are invalid, and low pressure difference linear voltage regulator 1 is in off state, and ON-OFF control circuit 8 is according to battery mode PMOD signal, and selector switch 8A turn-offs, switch 8B closure;
(4). battery in use for some time, its magnitude of voltage drops to 1.8V, cell voltage is less than the minimum value Vmin of battery operate as normal, terminal is shut down automatically.Antenna 4 can not be coupled from outside card reader magnetic field and obtain operating voltage, and its method of supplying power to is as follows:
Step 1.1, battery 2 provide operating voltage BAT_VDD by circuit to Power Management Unit 5 and battery voltage detection circuit 7:
Step 1.2, described Power Management Unit 5 provide operating voltage BB_VDD to baseband chip 6;
Step 1.3, described baseband chip 6 are to the invalid starting up of terminal status signal BB_POWER_ON of battery voltage detection circuit 7 transmission.
The open state signal BB_POWER_ON that step 2.2, described battery voltage detection circuit (7) receive is invalid, execution in step 3.1 or 3.2.
The mobile phone power-on status signal BB_POWER_ON of step 3.2, baseband chip (6) output is invalid, and promptly mobile phone is in off-mode, and the control signal RF_DET of external field testing circuit output is invalid, execution in step 4.4.
The battery powered mode status signal PMOD of step 4.4, battery voltage detection circuit 7 outputs is a battery mode four:
At this moment, BB_POWER_ON is invalid for the open state signal, and the signal RF_DET of external field testing circuit 12 outputs is invalid, and BAT_VDD＜Vmin;
Then battery voltage detection circuit 7 output control signal LDO_EN are invalid, and low pressure difference linear voltage regulator 1 turn-offs, and ON-OFF control circuit 8 is according to battery mode PMOD signal, and selector switch 8A turn-offs, switch 8B closure;
The operating voltage DVDD of low pressure difference linear voltage regulator 1 output is in power-down state, and simultaneously, the operating voltage CVDD of RF rectification circuit output is in power-down state, and therefore, entire circuit is in power-down state, and MVDD does not have power supply; Safety chip 11, Subscriber Identity Module 10, read write line 13 and non-contact front-end chip aftertreatment part 9 all quit work.
The purpose of this invention is to provide a kind of near-field communications terminal supply unit and method, it mainly is to be in manual or automatic off-mode at mobile phone, by making the bigger read write line power down of power consumption, use the remaining capacity and the external field of battery to detect the mode that combines, be the terminal power supply, make the function that terminal can the simulation of normal running non-contact card.Make full use of the remaining capacity of its end cell, improved the effective rate of utilization of battery.The burden that it has avoided the user must carry reserve battery whenever and wherever possible, also the while has been reduced the use cost of this terminal virtually.
Claims (10)
1, a kind of near-field communications terminal supply unit, comprise non-contact front-end chip, low pressure difference linear voltage regulator (1), battery (2), antenna (4), Power Management Unit (5), baseband chip (6), Subscriber Identity Module (10), safety chip (11) and read write line (13), it is characterized in that: also comprise battery voltage detection circuit (7) and gauge tap (8), described non-contact front-end chip comprises RF rectification circuit (3), external field testing circuit (12) and non-contact front-end aftertreatment part (9):
The port one of described battery voltage detection circuit (7) connects the port 2 of baseband chip (6), receives the starting up of terminal status signal BB POWER_ON that baseband chip (6) sends;
The port 2 of described battery voltage detection circuit (7) connects the port one of battery (2), the port one of low pressure difference linear voltage regulator (1) and the port one of Power Management Unit (5) respectively, and battery (2) provides operating voltage BAT_VDD to low pressure difference linear voltage regulator (1), Power Management Unit (5) and battery voltage detection circuit (7) respectively;
The port 3 of described battery voltage detection circuit (7) connects the port 3 of low pressure difference linear voltage regulator (1), and to low pressure difference linear voltage regulator (1) transmission of control signals LDO_EN;
The port 4 of described battery voltage detection circuit (7) connects the port 2 of external field testing circuit (12), receives the control signal RF_DET that external field testing circuit (12) sends;
The port 5 of described battery voltage detection circuit (7) connects the port 5 of gauge tap (8), and to gauge tap (8) transmission powering mode status signal PMOD;
Switch 8A two ends of described gauge tap (8) connect the port one and the port 3 of gauge tap (8) respectively, and another switch 8B two ends of described gauge tap (8) connect the port 2 and the port 4 of gauge tap (8) respectively;
The port one of described gauge tap (8) connects the port 2 of low pressure difference linear voltage regulator (1) and the port one of read write line (13), and low pressure difference linear voltage regulator (1) is the operating voltage DVDD after gauge tap (8) and read write line (13) transmission voltage stabilizing respectively;
The port 2 of described gauge tap (8) connects the port 3 of RF rectification circuit (3), receives the operating voltage CVDD that RF rectification circuit (3) provides;
The port 3 of described gauge tap (8) connects the port 4 that connects gauge tap (8) respectively, port one, the port one of Subscriber Identity Module (10) and the port one of safety chip (11) of non-contact front-end aftertreatment part (9), and gauge tap (8) provides operating voltage MVDD to non-contact front-end aftertreatment part (9), Subscriber Identity Module (10) and safety chip (11);
The port one of described RF rectification circuit (3) is connected antenna (4) two ends respectively with port 2;
The port 4 of described RF rectification circuit (3) connects the port one of external field testing circuit (12);
The port 2 of described non-contact front-end aftertreatment part (9) connects the port 2 of Subscriber Identity Module (10) and the port 3 of safety chip (11), bi-directional transfer of data respectively;
The port 2 of described Power Management Unit (5) connects the port one of baseband chip (6), and to baseband chip (6) transmission operating voltage BB_VDD;
The port 2 of described safety chip (11) connects the port 2 of read write line (13), bi-directional transfer of data.
2. a kind of near-field communications terminal supply unit as claimed in claim 1 is characterized in that, described safety chip (11) and non-contact front-end chip are integrated into a chips.
3. a near-field communication terminal method of supplying power to that uses near-field communications terminal supply unit is characterized in that, comprises following steps:
Step 1, battery voltage detection circuit (7) obtain the starting up of terminal status signal BB_POWER_ON by baseband chip (6) transmission;
Step 2, battery voltage detection circuit (7) detect the operating voltage BAT_VDD of current battery (2) output, the mobile phone power-on status signal BB_POWER_ON of monitoring baseband chip (6) output, and according to open state signal BB_POWER_ON selection subsequent step;
Step 3, battery voltage detection circuit receive external field testing circuit output control signal RF_DET and in conjunction with the shutdown threshold value Vth of operating voltage BAT_VDD and battery, the magnitude relationship of the minimum value Vmin of the operate as normal of battery is transmitted different control signals to gauge tap (8) with low pressure difference linear voltage regulator (1);
Step 4, gauge tap (8) and low pressure difference linear voltage regulator (1) are selected powering mode and on off state according to the signal that receives separately, for subsequent conditioning circuit provides operating voltage;
Described step 4 comprises following steps:
Step 4.1, effective as open state signal BB_POWER_ON, during the shutdown threshold value Vth of operating voltage BAT_VDD＞battery, the battery powered mode status signal PMOD of battery voltage detection circuit (7) output is a battery mode one;
Step 4.2, when open state signal BB_POWER_ON invalid, the signal RF_DET of external field testing circuit (12) output is effective, and during the minimum value Vmin of the operate as normal of operating voltage BAT_VDD＞battery, the battery powered mode status signal PMOD of battery voltage detection circuit (7) output is a battery mode two;
Step 4.3, when open state signal BB_POWER_ON invalid, the signal RF_DET of external field testing circuit (12) output is effective, and during the minimum value Vmin of the operate as normal of operating voltage BAT_VDD＜battery, the battery powered mode status signal PMOD of battery voltage detection circuit (7) output is a battery mode three;
Step 4.4, when open state signal BB_POWER_ON is invalid, when the signal RF_DET of external field testing circuit (12) output was invalid, the battery powered mode status signal PMOD of battery voltage detection circuit (7) output was a battery mode four.
4. as a kind of near-field communication terminal method of supplying power to as described in the claim 3, it is characterized in that described step 1 comprises following steps:
Step 1.1, described battery (2) provide operating voltage BAT_VDD to Power Management Unit (5) and battery voltage detection circuit (7);
Step 1.2, described Power Management Unit (5) provide operating voltage BB_VDD to baseband chip (6);
Step 1.3, described baseband chip (6) are to battery voltage detection circuit (7) transmission terminal open state signal BB_POWER_ON.
5. as a kind of near-field communication terminal method of supplying power to as described in the claim 3, it is characterized in that described step 2 comprises following steps:
Step 2.1, execution in step 4.1 when the open state signal BB_POWER_ON that receives when described battery voltage detection circuit (7) is effective;
Step 2.2, execution in step 3 when the open state signal BB_POWER_ON that receives when described battery voltage detection circuit (7) is invalid.
6. as a kind of near-field communication terminal method of supplying power to as described in the claim 3, it is characterized in that described step 3 comprises following steps:
Step 3.1, when the mobile phone power-on status signal BB_POWER_ON of baseband chip (6) output is invalid, promptly mobile phone is in manual or automatic off-mode, and the control signal RF_DET of external field testing circuit (12) output is effective,
When the minimum value Vmin of the operate as normal of operating voltage BAT_VDD＞battery, execution in step 4.2;
As the operate as normal NNd of operating voltage BAT_VDD＜battery, during value Vmin, execution in step 4.3;
Step 3.2, when the mobile phone power-on status signal BB_POWER_ON of baseband chip (6) output is invalid, promptly mobile phone is in off-mode, and the control signal RF_DET of external field testing circuit output is when invalid, execution in step 4.4.
7. as a kind of near-field communication terminal method of supplying power to as described in the claim 3, it is characterized in that described step 4.1 comprises following steps:
The battery powered mode status signal PMOD of battery voltage detection circuit (7) output is a battery mode one:
At this moment, BB_POWER_ON is effective for the open state signal, the shutdown threshold value Vth of operating voltage BAT_VDD＞battery;
Then battery voltage detection circuit output control signal LDO_EN is effective, and low pressure difference linear voltage regulator (1) is opened, and gauge tap (8) is according to battery mode PMOD signal, selector switch 8A closure, and switch 8B turn-offs;
The operating voltage MVDD of non-contact front-end chip aftertreatment part (9), Subscriber Identity Module (10) and safety chip (11) and the operating voltage of read write line (13) provide by the operating voltage DVDD of low pressure difference linear voltage regulator (1) output.
8. as a kind of near-field communication terminal method of supplying power to as described in the claim 3, it is characterized in that described step 4.2 comprises following steps:
The battery powered mode status signal PMOD of battery voltage detection circuit (7) output is a battery mode two:
At this moment, BB_POWER_ON is invalid for the open state signal, and the signal RF_DET of external field testing circuit (12) output is effective, and the minimum value Vmin of the operate as normal of operating voltage BAT_VDD＞battery;
Then battery voltage detection circuit (7) output control signal LDO_EN is effective, and low pressure difference linear voltage regulator (1) is opened, and gauge tap (8) is according to battery mode PMOD signal, selector switch 8A closure, and switch 8B turn-offs;
Safety chip (11) turn-offs the higher read write line (13) of power consumption, read write line (13) quits work, and the operating voltage MVDD of non-contact front-end chip aftertreatment part (9), Subscriber Identity Module (10) and safety chip (11) is provided by the operating voltage DVDD of low pressure difference linear voltage regulator (1) output.
9. as a kind of near-field communication terminal method of supplying power to as described in the claim 3, it is characterized in that described step 4.3 comprises following steps:
The battery powered mode status signal PMOD of battery voltage detection circuit (7) output is a battery mode three:
At this moment, BB_POWER_ON is invalid for the open state signal, and the signal RF_DET of external field testing circuit (12) output is effective, and the minimum value Vmin of the operate as normal of operating voltage BAT_VDD＜battery;
Then battery voltage detection circuit (7) output control signal LDO_EN is invalid, and low pressure difference linear voltage regulator (1) is in off state, and ON-OFF control circuit (8) is according to battery mode PMOD signal, and selector switch 8A turn-offs, switch 8B closure; Safety chip (11) turn-offs the higher read write line (13) of power consumption, read write line (13) quits work, and the operating voltage MVDD of non-contact front-end chip aftertreatment part (9), Subscriber Identity Module (10) and safety chip (11) is provided by the operating voltage CVDD of RF rectification circuit output.
10. as a kind of near-field communication terminal method of supplying power to as described in the claim 3, it is characterized in that described step 4.4 comprises following steps:
The battery powered mode status signal PMOD of battery voltage detection circuit (7) output is a battery mode four:
At this moment, BB_POWER_ON is invalid for the open state signal, and the signal RF_DET of external field testing circuit (12) output is invalid;
Then battery voltage detection circuit (7) output control signal LDO_EN is invalid, and low pressure difference linear voltage regulator (1) turn-offs, and ON-OFF control circuit (8) is according to battery mode PMOD signal, and selector switch 8A turn-offs, switch 8B closure;
The operating voltage DVDD of low pressure difference linear voltage regulator (1) output is in power-down state, and simultaneously, the operating voltage CVDD of RF rectification circuit output is in power-down state, and therefore, entire circuit is in power-down state, and MVDD does not have power supply; Safety chip (11), Subscriber Identity Module (10), read write line (13) and non-contact front-end chip aftertreatment part (9) all quit work.
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| TWI465059B (en) * | 2011-06-10 | 2014-12-11 | Broadcom Corp | Communications device for intelligently routing information among multiple user interfaces |
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| CN101964065B (en) * | 2009-07-23 | 2013-09-18 | 北京同方微电子有限公司 | Radio frequency integrated circuit for near-field communication |
| CN101621584B (en) * | 2009-07-27 | 2013-05-08 | 中兴通讯股份有限公司 | Using method of remaining battery power and performing device thereof |
| CN101894290B (en) * | 2010-04-06 | 2015-07-08 | 上海复旦微电子集团股份有限公司 | Non-contact communication device |
| CN101916950B (en) * | 2010-04-06 | 2013-06-12 | 上海复旦微电子集团股份有限公司 | Safety chip concentrator |
| CN102209129B (en) * | 2011-05-30 | 2014-04-02 | 惠州Tcl移动通信有限公司 | Mobile phone |
| CN102202119B (en) * | 2011-05-30 | 2013-11-06 | 惠州Tcl移动通信有限公司 | Cellphone |
| US9026047B2 (en) | 2011-06-29 | 2015-05-05 | Broadcom Corporation | Systems and methods for providing NFC secure application support in battery-off mode when no nonvolatile memory write access is available |
| CN102868209B (en) * | 2012-09-14 | 2014-07-16 | 北京万协通信息技术有限公司 | Dual-power structure of NFC-SD security card and SD security chip |
| CN104252631B (en) * | 2013-06-25 | 2017-12-29 | 神讯电脑(昆山)有限公司 | The control method of electronic installation and the electronic installation |
| CN103675202A (en) * | 2013-11-21 | 2014-03-26 | 哈尔滨东方报警设备开发有限公司 | Battery-free air quality detector based on NFC (near field communication) |
| EP3311465A1 (en) * | 2015-07-31 | 2018-04-25 | Huawei Technologies Co., Ltd. | A wireless communication device and method for rf energy harvesting |
| CN106921200B (en) * | 2017-05-04 | 2021-10-22 | 北京新能源汽车股份有限公司 | Wireless charging circuit of electric automobile, electric automobile and charging system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI465059B (en) * | 2011-06-10 | 2014-12-11 | Broadcom Corp | Communications device for intelligently routing information among multiple user interfaces |
| US9749016B2 (en) | 2011-06-10 | 2017-08-29 | Nxp Usa, Inc. | Communications device for intelligently routing information among multiple user interfaces |
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| CN101159027A (en) | 2008-04-09 |
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