CN102340240A - Interface current control circuit and control method - Google Patents
Interface current control circuit and control method Download PDFInfo
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- CN102340240A CN102340240A CN2011100432321A CN201110043232A CN102340240A CN 102340240 A CN102340240 A CN 102340240A CN 2011100432321 A CN2011100432321 A CN 2011100432321A CN 201110043232 A CN201110043232 A CN 201110043232A CN 102340240 A CN102340240 A CN 102340240A
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Abstract
The invention discloses an interface current control circuit and an interface current control method, which are applied to impulsive loads of Express card interfaces of digital equipment. Super capacitors are arranged between a current limiting circuit and a voltage conversion circuit, and when the impulsive load works in a transmitting state, energy stored by the super capacitors compensates for the insufficiency of power supply current of a digital equipment side. The circuit is simple, reliable, easy to realize and wide in application range; and the method can be applied to all impulsive loads such as global systems for mobile communication (GSM), general packet radio services (GPRS) or EDGEs, without sufficient current supply, of the interface.
Description
Technical field
The present invention relates to interface current control field, particularly a kind of interface current control circuit and control method.
Background technology
Express Card module be by PCMCIA alliance release a kind of thinner, sooner, lighter drawer type plug-in card, in order to replace existing P C card and Card Bus module, be mainly used in functional upgrading and functional expansion in the notebook aftermarket.The operation principle of wireless modem is the same with the principle of surfing Internet with cell phone, carries out power emission with fixing time slot, and institute's consumed current reaches peak value when being in emission state, near 2 amperes.Wireless modem based on Express Card interface is supported USB2.0 or PCI Express (or supporting both simultaneously).But no matter adopt the transfer of data of which kind of actualizing wireless modem and digital equipment side; All must defer to such principle; Promptly can not only provide pulse load (GSM, GPRS or EDGE) required peak current; Also to the electric current that drawn from the digital equipment side be limited, to guarantee not cause the main frame overload.But the difficult point that addresses this problem is; The output current that the required peak current of pulse load can provide much larger than digital equipment; Required excess energy when this makes us must take a kind of special circuit to be provided at pulse load to be in during the emission (being big electric current), and directly provide by the output of digital equipment side during non-emission the time.
Summary of the invention
The purpose of this invention is to provide a kind of interface current control circuit and control method, the Express card interface wireless MODEM of its ability logarithmic code equipment carries out Current Control.
On the one hand, the present invention provides a kind of interface current control circuit, is applicable to the Express card interface pulse load of digital equipment, it is characterized in that, comprising:
Current-limiting circuit, its input connects the current output terminal of said digital equipment side, and the electric current that is used for the output of logarithmic code equipment side carries out current limliting;
The super capacitor unit connects the output of said current-limiting circuit, is used for store electrical energy;
Voltage conversion circuit, its input connect said current-limiting circuit output and super capacitor unit output respectively, supply connected said pulse load to use in order to export stable voltage.
Said super capacitor unit comprises the super capacitor of two parallel connections.
Said current-limiting circuit comprises a current limliting chip and the resistance that is connected with its pin, and the electric current of said current-limiting circuit output is 0.6A～1.2A.
Said voltage conversion circuit comprises DC/DC chip, diode and the filter capacitor that connects successively.
On the other hand, the present invention also provides a kind of interface current control method, is applicable to the Express card interface pulse load of digital equipment, may further comprise the steps:
5.1, prepare a current-limiting circuit, receiving electric current output, and this electric current is carried out current limliting from said digital equipment;
5.2, will form the output that the super capacitor unit is connected said current-limiting circuit by super capacitor, when said pulse load was in non-emission state, said current-limiting circuit was charged to said super capacitor unit; When said pulse load is in emission state, said super capacitor unit output current;
5.3, prepare voltage conversion circuit; Supply the rear end load to use in order to export stable voltage; When said pulse load was in non-emission state, the electric current from said current-limiting circuit that said current-limiting circuit will receive was converted into stable electric current and supplies said pulse load to use; When said pulse load was in emission state, the electric current from said current-limiting circuit and super capacitor that said current-limiting circuit will receive was converted into stable electric current and supplies said pulse load to use.
Super capacitor unit in the said step 5.2 comprises the super capacitor of two parallel connections.
Current-limiting circuit in the said step 5.1 comprises a current limliting chip and the resistance that is connected with its pin, and the electric current of said current-limiting circuit output is 0.6A～1.2A.
Voltage conversion circuit in the said step 5.3 comprises DC/DC chip, diode and the filter capacitor that connects successively.
Adopt a kind of interface current control circuit of the present invention and control method; At first between current-limiting circuit and voltage conversion circuit, place super capacitor; When pulse load works in emission state, remedied the deficiency of digital equipment side supply current by the super capacitor energy stored, the circuit of its composition is simple and reliable, is easy to realize; And have wide range of applications, can adopting said method for the pulse load (GSM, GPRS or EDGE) that the total interface electric current supply is not enough.
Description of drawings
Fig. 1 is the entire block diagram of circuit according to the invention;
Fig. 2 is the current-limiting circuit of circuit according to the invention and the circuit diagram of super capacitor unit;
Fig. 3 is the circuit diagram of the voltage conversion circuit of circuit according to the invention.
Embodiment
Further specify technical scheme of the present invention below in conjunction with accompanying drawing and embodiment.
With reference to Fig. 1, Fig. 1 has shown a kind of interface current control circuit provided by the invention, is applicable to the Express card interface pulse load 14 of digital equipment, comprises current-limiting circuit 11, super capacitor unit 12, voltage conversion circuit 13.Digital equipment is a computer in the present embodiment, and wireless modem is pulse load.
The Express card interface of computer side has 2 kinds of voltage outputs, is respectively 1.5V and 3.3V.Wherein the output maximum current of 1.5V is 650mA, and the output maximum current of 3.3V is 1300mA.Here adopt the input power supply of the bigger 3.3V of power output as circuit according to the invention.The output current of current-limiting circuit 11 parts can be adjusted according to the upper limit of computer side output current, is set at 1200mA here.
Choosing of super capacitor will be considered its ESR value (series equivalent resistance), selects the lower super capacitor of ESR value as far as possible.Because the big electric current through super capacitor can cause big pressure drop on series equivalent resistance, cause the input terminal voltage fluctuation of voltage conversion circuit 13 excessive, and energy can be wasted on the equivalent resistance with the mode of heat.The value of super capacitor can be calculated by following formula:
Wherein
is for flowing through the average current of super capacitor; Here maximum occurrences is: 2A-1.3A=0.7A, mean value can be taken as 0.5A.
is the fluctuation range of voltage on the electric capacity, supposes that here the scope range of the fluctuation of voltage that voltage conversion circuit 13 inputs are allowed is 0.1V (this value is more little good more).
is operated in the time of emission state for pulse load 14; This time also is the discharge time of super capacitor; The transmit cycle of pulse load 14 probably is 2mS, and the duration of emission state is smaller or equal to 1mS.Can calculate the general numerical value
(concrete numerical value also needs to confirm according to the experiment situation) of super capacitor according to the setting of above parameter.
With reference to Fig. 2, said current-limiting circuit comprises a current limliting chip 11a and the resistance that is connected with its pin.Said current limliting chip 11a model is AAT4621, is a analog switch that output current scope is set, and input voltage VCC3V3 is from the 3.3V of computer side, and output voltage V CCIN is the input voltage of next stage voltage conversion circuit.Wherein ,/ENIU pin is the enable that upper current limit is set, and puts when low when it, opens this function.In like manner ,/the ENIL pin is the enable that lower current limit is set.In circuit described in the invention, mainly use the setting of upper current limit, therefore, put low/ENIU pin, and the higher limit of electric current is set through the resistance that the ISETU pin is connected.Here, according to the internal structure of current limliting chip 11a, the resistance of choosing resistance and be 1.5M Europe is as R802, and the resistance of choosing resistance simultaneously and be 750K Europe can be realized the scope of output current 0.6A～1.2A as R801.Work as output voltage, promptly the charging voltage of super capacitor reaches 98% o'clock of VCC, and the internal comparator of current limliting chip 11a will provide one and be ready to signal and give peripheral control unit, make corresponding action with the notice peripheral control unit.Here, the RHYS pin is used for being provided with the error range that reaches 98%VCC.Here the error range that draws according to computing formula is following:
It is 5mF that the value of super capacitor draws numerical value according to the aforementioned calculation principle, adopts the electric capacity parallel connection (C801 among Fig. 2 and C802, be worth be 4.4mF) of 2 2200uF here.
With reference to Fig. 3, voltage conversion circuit comprises DC/DC chip 13A, diode D2 and filter capacitor C805, the C816 that connects successively.Said DC/DC chip 13A is LTC3426, and input voltage is super capacitor voltage from the VCCIN (3.3V) shown in the figure.This DC/DC chip 13A output peak current can reach 2A, and switching frequency can reach 1.2M.Among the figure ,/SHDN pin makes DC/DC chip 13A work in enabled through drawing on the resistance of 1M Europe.What inductance L 101 was selected for use is the inductance of 2.2uH, has both guaranteed low series equivalent resistance, can suppress peak current again.Because the output current of this DC/DC chip 13A is 2A; The operating current of the diode of selecting for use also should reach 2A; Here the model that has adopted ON company is the Schottky diode D2 of MBRM120LT1G, and the input and output power supply has adopted filter capacitor C805 and the C816 of 10uF and 20uF respectively.
The output voltage of DC/DC chip 13A in this circuit is used for base band and radio frequency two parts.According to formula:
When VBAT_RF equaled 3.5V, can calculate and select R817 for use was 75K, and R840 is 39.2K, referring to Fig. 3.
On the other hand, the present invention also provides a kind of interface current control method, is applicable to the Express card interface pulse load of digital equipment, may further comprise the steps:
5.1, prepare a current-limiting circuit, receiving electric current output, and this electric current is carried out current limliting from said digital equipment.Said current-limiting circuit comprises a current limliting chip and the resistance that is connected with its pin, and the electric current of said current-limiting circuit output is 0.6A～1.2A.
5.2, will form the output that the super capacitor unit is connected said current-limiting circuit by super capacitor, when said pulse load was in non-emission state, said current-limiting circuit was charged to said super capacitor unit; When said pulse load is in emission state, said super capacitor unit output current.Said super capacitor unit comprises the super capacitor of two parallel connections.
5.3, prepare voltage conversion circuit; Supply the rear end load to use in order to export stable voltage; When said pulse load was in non-emission state, the electric current from said current-limiting circuit that said current-limiting circuit will receive was converted into stable electric current and supplies said pulse load to use; When said pulse load was in emission state, the electric current from said current-limiting circuit and super capacitor that said current-limiting circuit will receive was converted into stable electric current and supplies said pulse load to use.Said voltage conversion circuit comprises DC/DC chip, diode and the filter capacitor that connects successively.
It is pointed out that a kind of interface current control circuit of the present invention and described a kind of interface current control method, both are identical or similar on principle and embodiment, so repeating part repeats no more.
Those of ordinary skill in the art will be appreciated that; Above embodiment is used for explaining the present invention; And be not to be used as qualification of the present invention; As long as in connotation scope of the present invention, all will drop in claims scope of the present invention variation, the modification of above embodiment.
Claims (8)
1. an interface current control circuit is applicable to the Express card interface pulse load of digital equipment, it is characterized in that, comprising:
Current-limiting circuit, its input connects the current output terminal of said digital equipment side, and the electric current that is used for the output of logarithmic code equipment side carries out current limliting;
The super capacitor unit connects the output of said current-limiting circuit, is used for store electrical energy;
Voltage conversion circuit, its input connect said current-limiting circuit output and super capacitor unit output respectively, supply connected said pulse load to use in order to export stable voltage.
2. circuit as claimed in claim 1 is characterized in that, said super capacitor unit comprises the super capacitor of two parallel connections.
3. circuit as claimed in claim 1 is characterized in that, said current-limiting circuit comprises a current limliting chip and the resistance that is connected with its pin, and the electric current of said current-limiting circuit output is 0.6A～1.2A.
4. like claim 1 or 2 or 3 described circuit, it is characterized in that said voltage conversion circuit comprises DC/DC chip, diode and the filter capacitor that connects successively.
5. an interface current control method is applicable to the Express card interface pulse load of digital equipment, it is characterized in that, may further comprise the steps:
5.1, prepare a current-limiting circuit, receiving electric current output, and this electric current is carried out current limliting from said digital equipment;
5.2, will form the output that the super capacitor unit is connected said current-limiting circuit by super capacitor, when said pulse load was in non-emission state, said current-limiting circuit was charged to said super capacitor unit; When said pulse load is in emission state, said super capacitor unit output current;
5.3, prepare voltage conversion circuit; Supply the rear end load to use in order to export stable voltage; When said pulse load was in non-emission state, the electric current from said current-limiting circuit that said current-limiting circuit will receive was converted into stable electric current and supplies said pulse load to use; When said pulse load was in emission state, the electric current from said current-limiting circuit and super capacitor that said current-limiting circuit will receive was converted into stable electric current and supplies said pulse load to use.
6. method as claimed in claim 5 is characterized in that the super capacitor unit in the said step 5.2 comprises the super capacitor of two parallel connections.
7. method as claimed in claim 5 is characterized in that, the current-limiting circuit in the said step 5.1 comprises a current limliting chip and the resistance that is connected with its pin, and the electric current of said current-limiting circuit output is 0.6A～1.2A.
8. like claim 5 or 6 or 7 described methods, it is characterized in that the voltage conversion circuit in the said step 5.3 comprises DC/DC chip, diode and the filter capacitor that connects successively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2011100432321A CN102340240A (en) | 2010-07-20 | 2011-02-23 | Interface current control circuit and control method |
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| CN201010231877 | 2010-07-20 | ||
| CN201010231877.3 | 2010-07-20 | ||
| CN2011100432321A CN102340240A (en) | 2010-07-20 | 2011-02-23 | Interface current control circuit and control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103535111A (en) * | 2012-12-25 | 2014-01-22 | 华为终端有限公司 | Power supply circuit and wireless network card |
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| US5519711A (en) * | 1993-11-22 | 1996-05-21 | Nokia Mobile Phones Ltd. | Switch-mode power supply for time division multiple access radio phone systems |
| CN1520072A (en) * | 2003-02-07 | 2004-08-11 | Nec������ʽ���� | Power supply circuit and communication equipment having the same |
| CN101135926A (en) * | 2006-08-29 | 2008-03-05 | 中兴通讯股份有限公司 | Data card self-adapting power supply method and system |
| CN101635507A (en) * | 2009-08-19 | 2010-01-27 | 中兴通讯股份有限公司 | Power source of USB interface data card on wireless data terminal |
| CN101694596A (en) * | 2009-10-29 | 2010-04-14 | 深圳华为通信技术有限公司 | Power supply chip of data card and data card |
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2011
- 2011-02-23 CN CN2011100432321A patent/CN102340240A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5519711A (en) * | 1993-11-22 | 1996-05-21 | Nokia Mobile Phones Ltd. | Switch-mode power supply for time division multiple access radio phone systems |
| CN1520072A (en) * | 2003-02-07 | 2004-08-11 | Nec������ʽ���� | Power supply circuit and communication equipment having the same |
| CN101135926A (en) * | 2006-08-29 | 2008-03-05 | 中兴通讯股份有限公司 | Data card self-adapting power supply method and system |
| CN101635507A (en) * | 2009-08-19 | 2010-01-27 | 中兴通讯股份有限公司 | Power source of USB interface data card on wireless data terminal |
| CN101694596A (en) * | 2009-10-29 | 2010-04-14 | 深圳华为通信技术有限公司 | Power supply chip of data card and data card |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103535111A (en) * | 2012-12-25 | 2014-01-22 | 华为终端有限公司 | Power supply circuit and wireless network card |
| WO2014100968A1 (en) * | 2012-12-25 | 2014-07-03 | 华为终端有限公司 | Power supply circuit and wireless network card |
| CN103535111B (en) * | 2012-12-25 | 2017-02-22 | 华为终端有限公司 | Power supply circuit and wireless network card |
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Application publication date: 20120201 |