CN101694596A - Power supply chip of data card and data card - Google Patents
Power supply chip of data card and data card Download PDFInfo
- Publication number
- CN101694596A CN101694596A CN200910208813A CN200910208813A CN101694596A CN 101694596 A CN101694596 A CN 101694596A CN 200910208813 A CN200910208813 A CN 200910208813A CN 200910208813 A CN200910208813 A CN 200910208813A CN 101694596 A CN101694596 A CN 101694596A
- Authority
- CN
- China
- Prior art keywords
- voltage
- module
- power supply
- storage capacitor
- data card
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000003990 capacitor Substances 0.000 claims abstract description 59
- 238000004146 energy storage Methods 0.000 claims abstract description 13
- 230000009466 transformation Effects 0.000 claims description 47
- 230000007704 transition Effects 0.000 claims description 6
- 239000004065 semiconductor Substances 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 7
- 230000001105 regulatory effect Effects 0.000 abstract description 2
- 238000007599 discharging Methods 0.000 abstract 1
- 230000001052 transient effect Effects 0.000 description 6
- 238000005070 sampling Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000010295 mobile communication Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005538 encapsulation Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Images
Landscapes
- Power Sources (AREA)
Abstract
The invention provides a power supply chip of a data card and the data card. The power supply chip comprises a power supply interface, an energy-storage capacitor, a direct current/direct current voltage conversion module, and a power supply management unit, wherein the power supply interface is used for plugging a power supply and obtaining the power supply voltage; the energy-storage capacitor is connected with the power supply interface and is used for storing energy based on the power supply voltage and providing instantaneous current when in instantaneous discharging; the direct current/direct current voltage conversion module and the energy-storage capacitor are connected on the power supply interface in parallel and the direct current/direct current voltage conversion module is used for providing the obtained voltage for a radio frequency module after voltage conversion is carried out on the voltage output by the power supply interface and the energy-storage capacitor; and the power supply management unit is connected with the power supply interface or the output end of the direct current/direct current voltage conversion module and is used for providing the regulated voltage for a working module after voltage regulation of the obtained voltage. The power supply chip and the data card provided by the embodiment of the invention move the energy-storage capacitor from the rear end of the direct current/direct current voltage conversion module to the front end, and can reduce the capacitance value of the energy-storage capacitor, thus reducing the cost of a data card product.
Description
Technical field
The present invention relates to the data card technology, relate in particular to a kind of power supply chip and data card of data card.
Background technology
One of major function of data card product is to get online without being tethered to a cable at present, during use, can utilize existing notebook computer to pass through at USB (universal serial bus) (Universal Serial BUS, be called for short USB) on the port or other FPDP plug data card, existing because of special (Internet) surfs the web on the net, office and data transmission.The principle of work of data card wireless networking capabilities is as a modulator-demodular unit with network interface card, utilize mobile communications network to connect the internet by existing mobile operator and realize online, for example by general packet radio service (General Packet RadioService, abbreviation GPRS), CDMA inserts (Code Division Multiple Access is called for short CDMA) 1X network etc.Therefore, the module that radio frequency (RadioFrequency is called for short RF) module, RF control module and baseband module etc. are used to realize communication function need be set usually in the data card.
USB standard according at present current has four contacts on the USB port, be respectively power supply+5 volt (V), data-, data+and power supply ground, it is that external unit is powered that USB port can provide the voltage of 5V ± 5%.Data card carries out data transmission by USB port and computing machine by " data+" and " data-" passage, provides+the 5V supply voltage to data card by " power supply+5V " and " power supply ground ", and the assurance data card equipment can be worked normally.
Fig. 1 is the structural representation of existing a kind of data card.This data card comprises the RF module 10 and the operational module 20 of needs power supply.Can the operate as normal required operating voltage range of RF module 10 is wider, considers factors such as work efficiency and power consumption, usually operating voltage is arranged on 3.3V, and overtension can cause power consumption to increase, and brownout can influence operate as normal.When RF module 10 need transmit, for example based on global system for mobile communications (Global System for MobileCommunications, be called for short GSM), when under GSM burst (Burst) pattern, transmitting, the transmitted power when needing the big electric current of moment to guarantee that GSM opens.Operational module 20 is a plurality of set that need the functional module of power supply, for example can be base band and radio frequency control module, and the characteristics of power supply of its requirement is the operating voltage that needs the multiple voltage value, and required electric current is more stable.
Power demands based on functional module in the data card, power supply chip in the available data card generally comprises the power interface 60 of the supply power that is used to peg graft, also comprise DC-DC (DC/DC) voltage transformation module 30, be used for will input the 5V supply voltage be converted to the required 3.3V operating voltage of RF module 10.Power supply chip also comprises Power Management Unit (Power Management Unit is called for short PMU) 40, and PMU 40 is converted to the 5V supply voltage different operating voltage that adapts to operational module 20 different demands.Because each USB port maximum output current is 500 milliamperes (mA), therefore its output power can not surpass 2.25 watts (W), the external unit that has surpassed this power is equipped with external power supply with regard to needs, so in power supply chip, also need be provided with storage capacitor 50, storage capacitor 50 is connected in parallel on the output terminal of DC/DC voltage transformation module 30 with RF module 10, can carry out energy storage, the radio-frequency power amplifier of RF module 10 (Radio Frequency Power Amplifier is called for short RFPA) when needing transient high-current storage capacitor 50 release energy and provide big electric current for RFPA.
In carrying out research process of the present invention, the inventor finds that there is following defective in above-mentioned technology: in order to guarantee to provide transient high-current for RFPA, need provide jumbo storage capacitor, and the cost of big electric capacity is very high, this has significantly increased the cost of data card product.
Summary of the invention
The embodiment of the invention provides a kind of power supply chip and data card of data card, to reduce the cost of data card product.
The embodiment of the invention provides a kind of power supply chip of data card, comprising:
Power interface is used to the supply power of pegging graft, and obtains supply voltage;
Storage capacitor links to each other with described power interface, is used for carrying out energy storage based on described supply voltage, and momentary current is provided when instantaneous discharge;
The DC-DC voltage transformation module is connected in parallel on the described power interface with described storage capacitor, is used for the voltage of described power interface and storage capacitor output is carried out offering radio-frequency module after the voltage transitions;
Power Management Unit links to each other with the output terminal of described power interface or described DC-DC voltage transformation module, is used for carrying out offering operational module after the voltage adjustment from described power interface or from the voltage that described DC-DC voltage transformation module gets access to.
The embodiment of the invention also provides a kind of data card, comprises power supply chip, radio-frequency module and operational module, wherein:
Described power supply chip comprises power interface, storage capacitor, DC-DC voltage transformation module and Power Management Unit, and described DC-DC voltage transformation module is connected with described radio-frequency module, and described Power Management Unit is connected with described operational module, wherein,
Described power interface is used to the supply power of pegging graft, and obtains supply voltage;
Described storage capacitor links to each other with described power interface, is used for carrying out energy storage based on described supply voltage, and momentary current is provided when instantaneous discharge;
Described DC-DC voltage transformation module and described storage capacitor are connected in parallel on the described power interface, are used for the voltage of described power interface and storage capacitor output is carried out offering described radio-frequency module after the voltage transitions;
Power Management Unit, link to each other with the output terminal of described power interface or described DC-DC voltage transformation module, be used for carrying out offering described operational module after the voltage adjustment from described power interface or from the voltage that described DC-DC voltage transformation module gets access to.
Power supply chip that the embodiment of the invention provided and data card move to front the rear end of storage capacitor from the DC/DC voltage transformation module, can reduce the capacitance of storage capacitor, thereby reduce the cost of data card product.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do one to the accompanying drawing of required use in embodiment or the description of the Prior Art below introduces simply, apparently, accompanying drawing in describing below is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of existing a kind of data card;
The structural representation of the power supply chip of the data card that Fig. 2 provides for the embodiment of the invention one;
The structural representation of the power supply chip of the data card that Fig. 3 provides for the embodiment of the invention two.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
Embodiment one
The structural representation of the power supply chip of the data card that Fig. 2 provides for the embodiment of the invention one, this power supply chip comprises: power interface 60, storage capacitor 50, DC/DC voltage transformation module 30 and PMU 40.Wherein, power interface 60 is used to the supply power of pegging graft, and the USB port of for example pegging graft is obtained supply voltage; Storage capacitor 50 links to each other with power interface 60, is used for carrying out energy storage based on supply voltage, and momentary current is provided when instantaneous discharge; DC/DC voltage transformation module 30 is connected in parallel on the power interface 60 with storage capacitor 50, be used for linking to each other with RF module 10, DC/DC voltage transformation module 30 can link to each other with the pin of the RF module 10 to be connected that is provided with on the power supply chip in the practical application, and DC/DC voltage transformation module 30 is used for the voltage of power interface 60 and storage capacitor 50 outputs is carried out offering RF module 10 after the voltage transitions; PMU 40 links to each other with power interface 60, and PMU 40 is used for linking to each other with operational module 20, PMU 40 can link to each other with the pin of the operational module to be connected 20 that is provided with on the power supply chip in the practical application, and PMU 40 is used for supply voltage is carried out offering operational module 20 after the voltage adjustment.
In concrete the application, PMU 40 is not limited to be connected 60 pairs of supply voltages that get access to of power interface and adjusts, PMU 40 can also link to each other with the output terminal of DC/DC voltage transformation module 30, and the voltage that gets access to from DC/DC voltage transformation module 30 is carried out offering operational module 20 after the voltage adjustment.The regulating power of 40 pairs of voltages of PMU can be adjusted as required.
The course of work of present embodiment power supply chip is: power interface 60 can obtain the supply voltage of 5V from the USB port of computing machine; In the branch road that is 10 power supplies of RF module, DC/DC voltage transformation module 30 can be converted to the 5V supply voltage 3.3V routine work voltage and offer RF module 10, and this moment, storage capacitor 50 can charge by the 5V supply voltage, promptly carried out stored energy operation; When RF module 10 needs transient high-current, storage capacitor 50 releases energy, provide momentary current to DC/DC voltage transformation module 30, and then offer RF module 10, when storage capacitor 50 released energy, the voltage of storage capacitor 50 can continue to descend, voltage after 30 conversions of DC/DC voltage transformation module has been reduced to the minimum operating voltage of RF module 10,3V for example, then the both end voltage of storage capacitor 50 can't change again, also just stops to release energy; In the branch road that is operational module 20 power supplies, operational module 20 can be base band and radio frequency control module, needs different operating voltage, and then PMU40 can carry out supply voltage to offer operational module 20 after the voltage adjustment.
In the technical scheme of present embodiment, storage capacitor 50 is moved to front end from the rear end of DC/DC voltage transformation module 30, can significantly reduce the capacitance of storage capacitor 50, thereby reduce the cost of storage capacitor 50, promptly reduced the cost of data card product.
According to the electric capacity principle of work as can be known, capacitor discharge energy conservation formula is as follows:
Wherein, Δ E is the energy variation amount, and C is a capacitance, Δ V
2Voltage variety for the electric capacity two ends.
In the prior art, as shown in Figure 1, if storage capacitor 50 is arranged on the rear end, when RF module 10 needs transient high-current, the operating voltage of RF module 10 drops to minimum operating voltage 3V from 3.3V, and then the voltage variety at storage capacitor 50 two ends is 3.3-3=0.3V.In the present embodiment, as shown in Figure 2, storage capacitor 50 is arranged on front end, when storage capacitor 50 releases energy when making the input voltage of DC/DC voltage transformation module 30 descend, DC/DC voltage transformation module 30 can be adjusted dutycycle automatically to maximum, be that dutycycle is 100%, input voltage 100% exported to RF module 10.Reduce to the minimum operating voltage of RF module 10 up to the input voltage of DC/DC voltage transformation module 30, when for example reducing to 3.0V till.This moment, the voltage variety at storage capacitor 50 two ends was 5-3.0=2.0V.Than prior art, the voltage variety at storage capacitor 50 two ends has increased, and when the energy variation amount that obtains when hope is constant, just can suitably reduce according to above-mentioned conservation formula capacitance.Therefore, than prior art, the storage capacitor 50 in the present embodiment can adopt less capacitance, for example can reduce to 600 μ F from 2000 traditional microfarads (μ F).
Because momentary current is the variation of short time, so almost can ignore the influence of PMU.
Embodiment two
The structural representation of the power supply chip of the data card that Fig. 3 provides for the embodiment of the invention two, the difference of this power supply chip and embodiment one is also to have increased protection module 70.Protection module 70 is connected between power interface 60 and storage capacitor 50, DC/DC voltage transformation module 30 and the PMU40, can carry out current-limiting protection, the slow startup and/or the overvoltage/undervoltage protection.For example protection module 70 can specifically comprise the gentle functional module etc. that starts of current sampling switch.
The technical scheme of present embodiment adopts a part of circuit to realize current sampling switch and soft start function, can be the circuit that separates or is integrated in the inner circuit of integrated circuit (IC), thereby provide current-limiting function, anti-surge function etc. for data card.The concrete structure of protection module 70 can prepare according to the design needs, and concrete functional circuit can adopt the custom circuit of this area, is not described in detail in this.The data card that possesses defencive function can avoid taking place power supply trouble, for example reduces and causes the possibility that main frame is restarted, and avoids burning out host power supply.When powered on moment and plug data card, being provided with of current sampling switch can reduce sampling error, avoids causing such as the not enough problem of notebook class computer power, avoids causing that computing machine resets.
The power supply chip of the data card that the embodiment of the invention provided; can provide a kind of current-limiting function that possesses for data card owing to be provided with protection module; and because storage capacitor can discharge enough energy; make the RF module when absorbing big electric current, can obtain enough energy from storage capacitor; the decline rate of voltage decreases, thus make the DC/DC power supply plan have the fast transient response ability and power supply more stable.The rear end of storage capacitor from the DC/DC voltage transformation module moved to front, improve the stability of DC/DC voltage transformation module output voltage, make the power supply of RFPA in the RF module more stable, also reduced the capacitance of storage capacitor simultaneously, reduced the cost of data card product.
The power supply chip of the data card that various embodiments of the present invention provided preferably is encapsulated in the chip, is about to protection module 70, DC/DC voltage transformation module 30 and PMU40 and is encapsulated in the semi-conductor chip.On this semi-conductor chip, can be provided for connecting the pin of storage capacitor 50, and be provided with the pin that connects RF module 10 and operational module 20.Because it is bigger that packaging cost accounts for the cost of chip, present embodiment is once encapsulation with the designs simplification that prior art may need 3 chips to carry out 3 encapsulation, reduced cost, simplified operation, also reduced the package area that power supply chip takies simultaneously in data card.
The embodiment of the invention also provides a kind of data card, this data card comprises power supply chip, RF module 10 and operational module 20, referring to shown in Figure 2, this power supply chip comprises power interface 60, storage capacitor 50, DC/DC voltage transformation module 30 and PMU 40, and DC/DC voltage transformation module 30 is connected with RF module 10, and PMU 40 is connected with operational module 20.This operational module 20 can be base band and radio frequency control module etc. usually.
Wherein, this power interface 60 is used to the supply power of pegging graft, and obtains supply voltage; Storage capacitor 50 links to each other with power interface 60, is used for carrying out energy storage based on supply voltage, and momentary current is provided when instantaneous discharge; DC/DC voltage transformation module 30 is connected in parallel on the power interface 60 with storage capacitor 50, is used for the voltage of power interface 60 and storage capacitor 50 outputs is carried out offering RF module 10 after the voltage transitions; PMU40 links to each other with the output terminal of power interface 60 or DC/DC voltage transformation module 30, is used for carrying out offering operational module 20 after the voltage adjustment from power interface 50 or from the voltage that DC/DC voltage transformation module 30 gets access to.
This data card can further include protection module 70; referring to shown in Figure 3; protection module 70 is connected between power interface 60 and storage capacitor 50, DC/DC voltage transformation module 30 and the PMU 40, is used to carry out current-limiting protection, the slow startup and/or the overvoltage/undervoltage protection.
Preferably, this protection module 70, DC/DC voltage transformation module 30 and PMU 40 are encapsulated in the semi-conductor chip.
Power supply chip in the data card that the embodiment of the invention provided can adopt the power supply chip of the data card that the embodiment of the invention provides, and the data card that the embodiment of the invention provided has that cost is low, power supply is stable and the good advantage of transient response performance.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (7)
1. the power supply chip of a data card is characterized in that, comprising:
Power interface is used to the supply power of pegging graft, and obtains supply voltage;
Storage capacitor links to each other with described power interface, is used for carrying out energy storage based on described supply voltage, and momentary current is provided when instantaneous discharge;
The DC-DC voltage transformation module is connected in parallel on the described power interface with described storage capacitor, is used for the voltage of described power interface and storage capacitor output is carried out offering radio-frequency module after the voltage transitions;
Power Management Unit links to each other with the output terminal of described power interface or described DC-DC voltage transformation module, is used for carrying out offering operational module after the voltage adjustment from described power interface or from the voltage that described DC-DC voltage transformation module gets access to.
2. the power supply chip of data card according to claim 1 is characterized in that, also comprises:
Protection module is connected between described power interface and described storage capacitor, DC-DC voltage transformation module and the Power Management Unit, is used to carry out current-limiting protection, the slow startup and/or the overvoltage/undervoltage protection.
3. the power supply chip of data card according to claim 2 is characterized in that:
Described protection module, DC-DC voltage transformation module and Power Management Unit are encapsulated in the semi-conductor chip.
4. a data card comprises power supply chip, radio-frequency module and operational module, it is characterized in that:
Described power supply chip comprises power interface, storage capacitor, DC-DC voltage transformation module and Power Management Unit, and described DC-DC voltage transformation module is connected with described radio-frequency module, and described Power Management Unit is connected with described operational module, wherein,
Described power interface is used to the supply power of pegging graft, and obtains supply voltage;
Described storage capacitor links to each other with described power interface, is used for carrying out energy storage based on described supply voltage, and momentary current is provided when instantaneous discharge;
Described DC-DC voltage transformation module and described storage capacitor are connected in parallel on the described power interface, are used for the voltage of described power interface and storage capacitor output is carried out offering described radio-frequency module after the voltage transitions;
Power Management Unit, link to each other with the output terminal of described power interface or described DC-DC voltage transformation module, be used for carrying out offering described operational module after the voltage adjustment from described power interface or from the voltage that described DC-DC voltage transformation module gets access to.
5. data card according to claim 4 is characterized in that: described operational module is base band and radio frequency control module.
6. according to claim 4 or 5 described data cards, it is characterized in that, also comprise:
Protection module is connected between described power interface and described storage capacitor, DC-DC voltage transformation module and the Power Management Unit, is used to carry out current-limiting protection, the slow startup and/or the overvoltage/undervoltage protection.
7. data card according to claim 6 is characterized in that:
Described protection module, DC-DC voltage transformation module and Power Management Unit are encapsulated in the semi-conductor chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910208813A CN101694596A (en) | 2009-10-29 | 2009-10-29 | Power supply chip of data card and data card |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910208813A CN101694596A (en) | 2009-10-29 | 2009-10-29 | Power supply chip of data card and data card |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101694596A true CN101694596A (en) | 2010-04-14 |
Family
ID=42093569
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910208813A Pending CN101694596A (en) | 2009-10-29 | 2009-10-29 | Power supply chip of data card and data card |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101694596A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101950372A (en) * | 2010-07-23 | 2011-01-19 | 惠州Tcl移动通信有限公司 | Mobile terminal containing data card and power-supply control unit thereof |
| CN102156897A (en) * | 2011-03-30 | 2011-08-17 | 惠州Tcl移动通信有限公司 | Secure digital card and method for realizing near field communication function on same |
| CN102340240A (en) * | 2010-07-20 | 2012-02-01 | 上海闻泰电子科技有限公司 | Interface current control circuit and control method |
| CN102545568A (en) * | 2012-01-09 | 2012-07-04 | 华为终端有限公司 | Terminal power supply circuit and multi-mode data card |
| CN102694506A (en) * | 2012-06-06 | 2012-09-26 | 国光电器股份有限公司 | Audio-frequency amplifier system powered based on power supply of computer USB (Universal Serial Bus) power source and integration of USB audio card |
| WO2013155802A1 (en) * | 2012-04-16 | 2013-10-24 | 中兴通讯股份有限公司 | Wireless communication terminal |
| CN103535111A (en) * | 2012-12-25 | 2014-01-22 | 华为终端有限公司 | Power supply circuit and wireless network card |
| CN103728485A (en) * | 2013-09-11 | 2014-04-16 | 上海交通大学 | Synchronous voltage detection device with protection function |
-
2009
- 2009-10-29 CN CN200910208813A patent/CN101694596A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102340240A (en) * | 2010-07-20 | 2012-02-01 | 上海闻泰电子科技有限公司 | Interface current control circuit and control method |
| CN101950372B (en) * | 2010-07-23 | 2013-12-11 | 惠州Tcl移动通信有限公司 | Mobile terminal containing data card and power-supply control unit thereof |
| CN101950372A (en) * | 2010-07-23 | 2011-01-19 | 惠州Tcl移动通信有限公司 | Mobile terminal containing data card and power-supply control unit thereof |
| CN102156897A (en) * | 2011-03-30 | 2011-08-17 | 惠州Tcl移动通信有限公司 | Secure digital card and method for realizing near field communication function on same |
| CN102545568A (en) * | 2012-01-09 | 2012-07-04 | 华为终端有限公司 | Terminal power supply circuit and multi-mode data card |
| WO2013155802A1 (en) * | 2012-04-16 | 2013-10-24 | 中兴通讯股份有限公司 | Wireless communication terminal |
| RU2592397C2 (en) * | 2012-04-16 | 2016-07-20 | Зте Корпорейшн | Wireless communication terminal |
| CN102694506A (en) * | 2012-06-06 | 2012-09-26 | 国光电器股份有限公司 | Audio-frequency amplifier system powered based on power supply of computer USB (Universal Serial Bus) power source and integration of USB audio card |
| 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 |
| CN103728485A (en) * | 2013-09-11 | 2014-04-16 | 上海交通大学 | Synchronous voltage detection device with protection function |
| CN103728485B (en) * | 2013-09-11 | 2017-01-18 | 上海交通大学 | Synchronous voltage detection device with protection function |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101694596A (en) | Power supply chip of data card and data card | |
| CN208174340U (en) | The power supply circuit and electronic product of portable electronic product with OTG function | |
| CN107947252A (en) | Terminal and equipment | |
| EP3713044A1 (en) | Nfc antenna powering device | |
| CN107783629A (en) | Method of supplying power to, device and the wireless router device of USB interface | |
| CN113422411A (en) | PD charging circuit and POS machine | |
| CN205160131U (en) | Multiplexing charging circuit of multichannel power and use its mobile terminal | |
| CN207560037U (en) | A kind of 4G wireless routers of charged function | |
| CN102545568A (en) | Terminal power supply circuit and multi-mode data card | |
| CN101980435B (en) | Direct current/alternating-current converter for acquiring stable low voltage and telephone power supply circuit | |
| US12143023B2 (en) | Drive scheme for secondary-controlled active clamp flyback (ACF) mode | |
| CN102103400A (en) | Power supply device and using method thereof | |
| CN202160285U (en) | LTE wireless network card terminal apparatus | |
| CN221150986U (en) | Intelligent quick-charging device | |
| US20240283352A1 (en) | Implementing power factor correction with single-stage flyback converters operating with a variable switching frequency | |
| CN108156652A (en) | Wireless communication module based on NB-IoT | |
| US20040229660A1 (en) | Peak current control in wireless network interface devices | |
| US12261522B2 (en) | Efficiency improvement for power factor correction based AC-DC power adapters | |
| CN215221202U (en) | Vehicle-mounted USB concentrator supporting high-power charging | |
| CN218415857U (en) | Power supply circuit of mobile phone power supply | |
| CN104167778A (en) | Power supply circuit | |
| CN212658958U (en) | ARM-based 4G Internet of things device | |
| CN105449730B (en) | A kind of power circuit, battery and electronic equipment | |
| CN211557273U (en) | Novel electric power standardization communication core board | |
| EP4228120A1 (en) | Power system, charging method, and discharging method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20100414 |