Double USB onboard chargersTechnical field
The utility model is related to onboard charger more particularly to a kind of double USB onboard chargers.
Background technology
It is commonly used currently, the portable electronic devices such as mobile phone, IPAD, digital camera have become modern's essential dayProduct are especially travelling outdoors, are going on business during the journey, and these electronic equipments are generally equipped with rechargeable battery, special to fillElectric appliance and data line are used for transmission, the equipment charge etc. of data.But since dedicated charger needs to use AC power, soIt is the selection that electronic equipment carries out that charging is only by vehicle-mounted USB charger.
In the prior art, universal vehicle-mounted USB charger UAB charging interfaces only there are one, cannot simultaneously give it is multiple externalEquipment is powered, it is difficult to meet the use demand of user.Also, onboard charger currently used in the market, output voltage electricityStream is unable to reach standard output.
Invention content
The purpose of the utility model is to overcome the deficiencies in the prior art, provide a kind of high power, double-USB interface, voltage electricityThe stable double USB onboard chargers of stream output.
The technical solution of the utility model is as follows：A kind of double USB onboard chargers, including connect with automotive interior vehicle power supplyThe power input and export to the first USB charging interface of external equipment and the second USB charging interface, the electricity that mouth is electrically connectedOver-current over-voltage protection electricity has been sequentially connected electrically between source input terminal and first USB charging interface and the second USB charging interfaceRoad, the first filter circuit, decompression and flow increasing circuit, the second filter circuit, detection sample circuit and short-circuit protection circuit.
In the above-mentioned technical solutions, the power input is electrically connected with the DC12-24V vehicle power supplies of automotive interior, withMake the power input input 12-24V direct currents.
In the above-mentioned technical solutions, the direct current of 12-24V is depressurized to 5V by the decompression and flow increasing circuit.
In the above-mentioned technical solutions, the current limliting after the short-circuit protection circuit of the electric current after the decompression to 1A and exports extremelyFirst USB charging interface, the electric current that first USB charging interface can detect load automatically adjust output currentSize.
In the above-mentioned technical solutions, the current limliting after the short-circuit protection circuit of the electric current after the decompression to 2.1A and exportsTo second USB charging interface.
Compared with the existing technology, the beneficial effects of the utility model are：The utility model is equipped with double USB charging interfaces,The use demand of user can be met, while passing through its circuit design, double-USB interface directly to multiple charging external equipmentsTotal 3.1A electric currents output, 1.0A interfaces are stablized with the output of 2.1A interface voltage electric currents, can preferably promote the use of terminal userIt enjoys.
Description of the drawings
Fig. 1 is the structural principle block diagram of the utility model；
Fig. 2 is the circuit diagram of the utility model.
Specific implementation mode
Below in conjunction with the drawings and specific embodiments, the utility model is described in detail.
It please refers to Fig.1, Fig. 2, a kind of double USB onboard chargers provided by the utility model, it is a variety of vehicle-mounted to be suitable forThe onboard charger of application, double USB onboard chargers include the power input being electrically connected with automotive interior vehicle power supply interfaceIt holds 11 and exports to external equipment the first USB charging interface 12 and the second USB charging interface 13, power input 11 and firstOvercurrent-overvoltage protecting circuit 21, the first filtered electrical have been sequentially connected electrically between USB charging interface 12 and the second USB charging interface 13Road 22, decompression and flow increasing circuit 23, the second filter circuit 24, detection sample circuit 25 and short-circuit protection circuit 26.
In the present embodiment, power input 11 is electrically connected with the DC12-24V vehicle power supplies of automotive interior, so that power supply is defeatedEnter 11 input 12-24V direct currents of end, DC12-24V is accessed, after overcurrent-overvoltage protecting circuit 21, then by the first filter circuitThen 22 filterings are depressurized to 5V by decompression and flow increasing circuit 23, then distinguish current limliting to 1.0A and 2.1A after short-circuit protection circuit 26And exported respectively to the first USB charging interface 12 and the second USB charging interface 13, then give outer power supply.Wherein, the first USBThe electric current that charging interface 12 can detect load automatically adjusts the size of output current.
Double USB charging interfaces that the double USB onboard chargers of the present embodiment are equipped with, in the case of correct connection, Ke YizhiIt holds multiple mobile devices to plug in, meets the use demand of user, while by its circuit design, double-USB interface is total3.1A electric currents export, and 1.0A interfaces are stablized with the output of 2.1A interface voltage electric currents, and the use that can preferably promote terminal user is enjoyedBy.
The above is only the preferred embodiments of the present utility model only, is not intended to limit the utility model, all in this practicalityAll any modification, equivalent and improvement etc., should be included in the guarantor of the utility model made by within novel spirit and principleWithin the scope of shield.