CN103164727B - A kind of radio-frequency card suppressing upper TV university electric current - Google Patents
A kind of radio-frequency card suppressing upper TV university electric current Download PDFInfo
- Publication number
- CN103164727B CN103164727B CN201110426640.5A CN201110426640A CN103164727B CN 103164727 B CN103164727 B CN 103164727B CN 201110426640 A CN201110426640 A CN 201110426640A CN 103164727 B CN103164727 B CN 103164727B
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- radio
- circuit
- frequency card
- biasing resistor
- pmos
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- 230000001629 suppression Effects 0.000 title claims abstract description 8
- 230000003139 buffering Effects 0.000 claims abstract description 24
- 230000000630 rising Effects 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims description 3
- 230000001105 regulatory Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 230000001340 slower Effects 0.000 abstract description 3
- 239000004065 semiconductor Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000002493 climbing Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000010295 mobile communication Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Abstract
A kind of radio-frequency card suppressing upper TV university electric current of the present invention, including radio-frequency card body and current buffering circuit, each circuit on described radio-frequency card body is connected with the power supply of mobile phone by current buffering circuit, and it is power on speed and the current peak that powers on of voltage when powering of each circuit on radio-frequency card body that described current buffering circuit slows down the power supply of mobile phone.The invention has the beneficial effects as follows: use technical solution of the present invention, effectively prevent the problem that the mobile phone detection excessive generation of electric current cannot be started up.Present configuration is simple, it is easy to accomplish, on the basis of not changing original circuit structure, eliminate and cause because circuit function increases sheet to power on the excessive hidden danger of electric current.
Description
Technical field
The present invention relates to a kind of radio-frequency card, particularly relate to a kind of radio-frequency card suppressing upper TV university electric current, belong to the communications field.
Background technology
Along with becoming increasingly popular of mobile communication terminal, mobile phone embeds radio-frequency card, i.e. radio frequency-subscriber identification module card,
Enable people to utilize the RF-SIM card in mobile phone to process the routine matters such as purchase and consumption, small amount payment and work attendance, have become as
One new research and development direction of mobile communication industry.At present, RF-SIM card is arranged in mobile phone, and it is led to by realizing radio frequency
The circuit of telecommunication function and existing common SIM cards are integrated and become RF-SIM card.Along with the development of science and technology, slight SIM needs
Integrated function can be continuously increased, and due to being continuously increased of RF-SIM card on-chip circuit, radio-frequency card is to the power reguirements of mobile phone also
It is being continuously increased, and the capacitive of the restriction powered due to mobile phone and radio-frequency card internal circuit is limiting, mobile phone power-on power supply process
In very likely occur detection electric current excessive, cause mobile phone cannot normal boot-strap problem occur.
Summary of the invention
The technical problem to be solved is to provide a kind of radio-frequency card suppressing upper TV university electric current so that powering on
During pulse current be inhibited, thus ensure card power on electric current mobile phone allow in the range of, make mobile phone normal boot-strap.
A kind of radio-frequency card suppressing upper TV university electric current of the present invention, including radio-frequency card body and current buffering circuit, described
Each circuit on radio-frequency card body is connected with the power supply of mobile phone by current buffering circuit, and described current buffering circuit slows down hands
The power supply of machine is power on speed and the current peak that powers on of voltage when powering of each circuit on radio-frequency card body.
The invention has the beneficial effects as follows:
Use technical solution of the present invention, effectively prevent the problem that the mobile phone detection excessive generation of electric current cannot be started up.This
Bright simple in construction, it is easy to accomplish, on the basis of not changing original circuit structure, eliminate and cause sheet because circuit function increases
The hidden danger that the electric current that powers on is excessive.
Further, described current buffering circuit is arranged on radio-frequency card body.
The operation principle of described circuit is such that after VCC is energized, and the grid voltage of metal-oxide-semiconductor is equal with VCC, this
Time VGS=0, pipe can not turn on, drain electrode do not have voltage to export；Along with the charging (charging interval is determined by RC) of electric capacity, VGS's
Voltage difference is increasing, and when the pressure reduction of VGS arrives the cut-in voltage VP of metal-oxide-semiconductor, pipe turns on, thus the output voltage that drains, give
Card circuit is powered.When not having this electric capacity, the voltage of VCC is directly by electric resistance partial pressure to the grid of metal-oxide-semiconductor, thus directly
Form the pressure reduction of VGS, the most instantaneous complete, so metal-oxide-semiconductor the most directly conducting, the most do not play the work of hold-off voltage rising
With.
Further, described current buffering circuit includes PMOS and for regulating the control electricity of output voltage rise time
Road, the drain electrode of described PMOS connects the input of each circuit on radio-frequency card body, the source electrode catcher electromechanical source of described PMOS,
Described control circuit is located between the grid of PMOS and source electrode, controls the voltage rising time of PMOS.
Further, described control circuit includes the first biasing resistor, the second biasing resistor and a shunt capacitance, Qi Zhong
One biasing resistor is connected with the second biasing resistor with after electric capacity parallel connection, the other end ground connection of described second biasing resistor, described also
One end of the electric capacity of connection and the first biasing resistor and the series connection of the second biasing resistor is connected with the grid of PMOS, described parallel connection
The other end of electric capacity and the first biasing resistor is connected with the source electrode of PMOS.
Changing wherein one or two size of the first biasing resistor of described parallel connection and electric capacity, scalable exports radio frequency
The speed that powers on of the voltage of each circuit on card body, before not adding current buffering circuit, the voltage rate of rise of SIM
For k1, after adding current buffering circuit, the climbing speed of output voltage becomes k2, k1 > k2, as it is shown on figure 3, by integral equation
Understand
i=C*d(v)/d(t)
It can thus be appreciated that:
So, it is not powered on the current peak i1 < i2 before and after stream buffer circuit 12, as shown in Figure 4, peak point current is had
Effect controls.With the resistance in adjusting control circuit or capacitance, or different back-end circuit can be connected, all can be controlled in mobile phone
Maximum load current, it is ensured that mobile phone normal boot-strap.
Accompanying drawing explanation
Fig. 1 is the structure chart of radio-frequency card of the present invention；
Fig. 2 is the current buffering circuit circuit diagram of radio-frequency card of the present invention；
Fig. 3 is the output voltage schematic diagram in the embodiment of the present invention before and after addition buffer circuit；
Fig. 4 is the current diagram that powers in the embodiment of the present invention before and after addition buffer circuit.
Detailed description of the invention
Being described principle and the feature of the present invention below in conjunction with accompanying drawing, example is served only for explaining the present invention, and
Non-for limiting the scope of the present invention.
As it is shown in figure 1, a kind of radio-frequency card suppressing upper TV university electric current described in the specific embodiment of the invention 1, including radio frequency
Each circuit 3 on card body and current buffering circuit 2, each circuit on described radio-frequency card body 3 by current buffering circuit 2 with
The power supply 1 of mobile phone is connected, and it is that each circuit 3 on radio-frequency card body is powered that described current buffering circuit 2 slows down the power supply of mobile phone
Time voltage the speed that powers on.
As in figure 2 it is shown, described current buffering circuit 2 is current buffering circuit, described current buffering circuit includes PMOS
21 and for regulating the control circuit 22 of output voltage rise time, it is each that the drain electrode of described PMOS 21 connects on radio-frequency card body
Circuit 3, the source electrode catcher electromechanical source 1 of described PMOS 21, described control circuit 22 is located at grid and the source of PMOS 21
The voltage rising time of PMOS 21 is controlled between pole.
Described control circuit 22 includes the first biasing resistor R2, the second biasing resistor R1 and a shunt capacitance composition, institute
State the first biasing resistor R2 to connect with the second biasing resistor R1 with after electric capacity parallel connection, another termination of described second biasing resistor R1
Ground, one end of the electric capacity of described parallel connection and the first biasing resistor R2 and the second biasing resistor R1 series connection and the grid phase of PMOS 21
Connecting, electric capacity and the other end of the first biasing resistor R2 of described parallel connection are connected with the source electrode of PMOS 21.
Changing wherein one or two size of the first biasing resistor R2 of described parallel connection and electric capacity, scalable exports penetrates
Frequently the power-on time of the voltage of each circuit 3 on card body.
As shown in Figure 3,4, change wherein one or two size of the first biasing resistor R2 of described parallel connection and electric capacity, can
Regulation exports the speed that powers on of the voltage of each circuit on radio-frequency card body, before not adding current buffering circuit, radio frequency
The voltage rate of rise of card is k1, and after adding current buffering circuit, the climbing speed of output voltage becomes k2, k1 > k2, by amassing
Equation is divided to understand
i=C*d(v)/d(t)
It can thus be appreciated that:
So, it being not powered on the current peak i1 < i2 before and after stream buffer circuit 12, peak point current has obtained effective control.
These are only presently preferred embodiments of the present invention, not in order to limit the present invention, all in the spirit and principles in the present invention
Within, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
Claims (3)
1. a radio-frequency card for the upper TV university electric current of suppression, including radio-frequency card body, it is characterised in that also include current buffering electricity
Road, each circuit on described radio-frequency card body is connected with the power supply of mobile phone by current buffering circuit, described current buffering electricity
It is power on speed and the current peak that powers on of voltage when powering of each circuit on radio-frequency card body that the power supply of mobile phone is slowed down on road；
Described current buffering circuit includes PMOS and for regulating the control circuit of output voltage rise time；
Described control circuit includes the first biasing resistor, the second biasing resistor and a shunt capacitance, described first biasing resistor
Connect with the second biasing resistor with after electric capacity parallel connection, the other end ground connection of described second biasing resistor, the electric capacity of described parallel connection and
One end of first biasing resistor and the series connection of the second biasing resistor is connected with the grid of PMOS, the electric capacity of described parallel connection and first
The other end of biasing resistor is connected with the source electrode of PMOS；Change the first biasing resistor of described parallel connection and electric capacity one of them
Or the size of two, scalable exports the speed that powers on of the voltage of each circuit on radio-frequency card body.
2. according to the radio-frequency card described in claim 1, it is characterised in that described current buffering circuit is arranged on radio-frequency card body
On.
3. according to the radio-frequency card described in claim 2, it is characterised in that it is each that the drain electrode of described PMOS connects on radio-frequency card body
The input of circuit, the source electrode catcher electromechanical source circuit output end of described PMOS, described control circuit is located at the grid of PMOS
The voltage rising time of PMOS is controlled between pole and source electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110426640.5A CN103164727B (en) | 2011-12-19 | A kind of radio-frequency card suppressing upper TV university electric current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110426640.5A CN103164727B (en) | 2011-12-19 | A kind of radio-frequency card suppressing upper TV university electric current |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103164727A CN103164727A (en) | 2013-06-19 |
| CN103164727B true CN103164727B (en) | 2016-12-14 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101325411A (en) * | 2008-04-16 | 2008-12-17 | 中兴通讯股份有限公司 | Slow starting circuit for electrifying DC power supply |
| CN101964711A (en) * | 2010-09-20 | 2011-02-02 | 华为终端有限公司 | Power supply circuit and power supply chip of data card, and data card |
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101325411A (en) * | 2008-04-16 | 2008-12-17 | 中兴通讯股份有限公司 | Slow starting circuit for electrifying DC power supply |
| CN101964711A (en) * | 2010-09-20 | 2011-02-02 | 华为终端有限公司 | Power supply circuit and power supply chip of data card, and data card |
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