CN203522254U - Dual power USB power supply unit - Google Patents

Abstract

The utility model relates to a dual power USB power supply unit which comprises a high-energy density storage battery and a USB charging interface. The dual power USB power supply unit is characterized in that the dual power USB power supply unit also comprises a dual power supply drive circuit, a USB power switching control circuit and a USB output control circuit, wherein the dual power supply drive circuit is composed of an AC/DC voltage stabilizing circuit, a battery charging circuit, a DC/DC step-down voltage-stabilizing circuit and a DC/DC step-up voltage-stabilizing circuit; when accessed to mains supply, the AC/DC voltage stabilizing circuit converts the AC mains supply to direct voltage, and the DC/DC step-down voltage-stabilizing circuit is used to provide power for charging external USB equipment and a battery; after mains supply is disconnected, the USB power switching control circuit switches to storage battery power supply for the external USB equipment; and simultaneously, a USB output control circuit provides overload protection for the whole power supply unit.

Description

A kind of duplicate supply USB electric supply installation

Technical field

The utility model relates to power supply and distribution technique field, and being specifically related to a kind of is the device of mobile power supply equipment.

Background technology

Along with popularizing of handheld electronics device, it is the built-in battery charging of equipment that increasing handheld electronics device, particularly smart mobile phone all adopt USB interface.The USB electric supply installation that currently available technology provides only adopts the mode of mains-supplied, although its structure is simple, but when carrying handheld electronics device and go out, once there is the situation that electric weight is used up, want that continuing to use this equipment must find AC power is equipment charge by USB electric supply installation, it is very inconvenient therefore to use; Although also there is the emergent charging apparatus of internal battery in market, such device structure is too complicated, thereby and such device neither have and according to electronic device works situation, power supply output controlled the function that reduces energy resource consumption and protection electronic product.

Summary of the invention

In view of the deficiency of prior art, it is a kind of simple in structure that the utility model provides, the USB electric supply installation of diverse in function, and this device adopts dual power supply, and can in electronic device works situation, to power supply output, control, extremely easy to use.

The technical scheme that the utility model addresses the above problem is as follows:

A duplicate supply USB electric supply installation, comprises high-energy-density storage battery and USB charging inlet, it is characterized in that, this device also comprises dual power supply drive circuit, USB electrical source exchange control circuit and USB output control circuit, wherein,

Described dual power supply drive circuit is comprised of AC/DC voltage stabilizing circuit, battery charger, DC/DC decompression voltage regulator and DC/DC voltage boosting and stabilizing circuit, wherein, the ac input end of AC/DC voltage stabilizing circuit is electrically connected to city, and DC output end connects respectively the input of DC/DC decompression voltage regulator and the control end of USB electrical source exchange control circuit; Battery charger is the charge management circuit with over-current over-voltage protection, and the output of this circuit is connected across on the both positive and negative polarity of storage battery; DC/DC decompression voltage regulator has two-way output, and a road is connected to USB charging inlet through USB output control circuit, and another road is connected with the input of battery charger; The input of DC/DC voltage boosting and stabilizing circuit is connected across on the both positive and negative polarity of storage battery;

Described USB electrical source exchange control circuit is a contactless electronic beam switch circuit, and wherein, the input of this circuit is connected with the output of DC/DC voltage boosting and stabilizing circuit, and output is connected to USB charging inlet through USB output control circuit;

Described USB output control circuit is comprised of USB overload protection control chip and peripheral detection control circuit thereof; wherein; the peripheral control circuit that detects is comprised of sampling resistor and the electronic switch of connecting with USB charging inlet successively; the voltage signal that wherein sampling resistor collects USB charging inlet is delivered to the test side of USB overload protection control chip, controls the turn-on and turn-off of electronic switch.

The operation principle of a kind of duplicate supply USB electric supply installation described in the utility model is as follows:

When civil power accesses, this device is converted to direct voltage by AC/DC voltage stabilizing circuit by electric main, and through USB output control circuit, provides power supply for circumscribed USB equipment by DC/DC decompression voltage regulator; Meanwhile, by DC/DC decompression voltage regulator, by battery charger, be charge in batteries.Now, due to the input of civil power, the cut-off of USB electrical source exchange control circuit, storage battery is no longer for circumscribed USB equipment provides electric power; After civil power disconnects, as user wants to continue to use this device, USB electrical source exchange control circuit conducting, provides electric power through DC/DC voltage boosting and stabilizing circuit for circumscribed USB equipment by storage battery; USB overload protection control chip is for detection of the output current of USB charging inlet; when external USB device is too much or USB interface output overloading occurs extremely to cause; USB overload protection control chip is controlled electronic switch and is turn-offed, thereby protective device is not because overload is damaged.

Compared with prior art; because having adopted duplicate supply mode, the utility model drives; the power supply needs of the hand-held device of most of occasions have been met; and thereby this device can be controlled protective device not because overload is damaged to power supply output according to the working condition of USB device; when having improved the reliability of equipment, greatly facilitate the use of all types of user.

Accompanying drawing explanation

Fig. 1 is the schematic block circuit diagram of a kind of duplicate supply USB electric supply installation described in the utility model.

Fig. 2～Fig. 7 is the circuit theory diagrams of a specific embodiment of duplicate supply USB electric supply installation described in the utility model, wherein, Fig. 2～Fig. 5 is followed successively by AC/DC voltage stabilizing circuit, battery charger, DC/DC decompression voltage regulator and the DC/DC voltage boosting and stabilizing circuit in dual power supply drive circuit; Fig. 6 is USB electrical source exchange control circuit; Fig. 7 is USB output control circuit.

Embodiment

Referring to Fig. 1, this example is a USB electric supply installation that adopts the USB external equipment power supply that lithium battery group that rated voltage is 3.7V and civil power duplicate supply be two 5V.This device comprises with dual power supply drive circuit, USB electrical source exchange control circuit and USB output control circuit, wherein, dual power supply drive circuit is comprised of the DC/DC voltage boosting and stabilizing circuit shown in the AC/DC voltage stabilizing circuit described in Fig. 2, the battery charger shown in Fig. 3, the DC/DC decompression voltage regulator shown in Fig. 4 and Fig. 5.

Referring to Fig. 2, described AC/DC voltage stabilizing circuit is the integrated AC/DC power module U8 of height that the model of can an export+12V is BRAW12-220S10, its input is electrically connected to city, and+12V DC output end connects respectively the control end of a DC/DC decompression voltage regulator, the 2nd DC/DC decompression voltage regulator and USB electrical source exchange control circuit and LED electrical source exchange control circuit.

Referring to Fig. 3, described battery charger is that a model is the battery charge controlling chip U5 of TP4055 and the lithium battery charging management circuit that peripheral circuit forms thereof, the direct-flow input end of this circuit is connected with the DC output end of a DC/DC decompression voltage regulator, and charging output is connected to the both positive and negative polarity of lithium battery BT1.

Referring to Fig. 4, described DC/DC decompression voltage regulator is that a model is the synchronous adjustable lowering and stabilizing blood pressure chip U6 of DC/DC monolithic of MP2307 and the BUCK type reduction voltage circuit that peripheral circuit forms thereof, wherein, the output voltage of DC/DC decompression voltage regulator is 5V, and the output of DC/DC decompression voltage regulator is connected to USB output control circuit.

Referring to Fig. 5, described DC/DC voltage boosting and stabilizing circuit is that a model is the constant current mode DC/DC monolithic of the FP6293 BOOST type booster circuit that voltage stabilizing chip U7 and peripheral circuit thereof form that boosts, its voltage input end is connected with lithium battery BT1, and its voltage output end is connected with the input of USB electrical source exchange control circuit.

Referring to Fig. 6, USB electrical source exchange control circuit is by positive-negative-positive pliotron Q6, reverse-filling diode D2, and peripheral divider resistance R12 and R17 composition, wherein, the collector electrode of pliotron Q6 is connected to the 5V DC power output end of DC/DC decompression voltage regulator and the input of USB output control circuit, and emitter is connected with the negative electrode of diode D2, and the anodic bonding of diode D2 is to the voltage output end of DC/DC voltage boosting and stabilizing circuit; Divider resistance R12 is upper minute pressure arm, and divider resistance R17 is lower minute pressure arm, the output of be connected across+12V power supply after minute pressure arm series connection, and dividing point is connected with the base stage of pliotron Q6.When mains-supplied, AC/DC power module U8 output+12V voltage, make positive-negative-positive pliotron Q6 cut-off, by civil power, by AC/DC power module, DC/DC decompression voltage regulator and USB output control circuit, be that circumscribed USB equipment is powered, after civil power disconnects, positive-negative-positive pliotron Q6 conducting is that circumscribed USB equipment is powered by lithium battery BT1 by DC/DC voltage boosting and stabilizing circuit, USB output control circuit.

Referring to Fig. 7; the USB overload protection control chip U2 that USB output control circuit is DW01 by a model and peripheral detection control circuit thereof form, and the wherein said peripheral control circuit that detects is comprised of sampling resistor R6 and the electronic switch of connecting with USB charging inlet successively.Above-mentioned peripheral detection in control circuit, electronic switch is N channel field-effect pipe Q1 and Q2 and the difference reverse parallel connection Q1 with drain electrode differential concatenation by a pair of source electrode, two diode D8 in Q2 source electrode-drain electrode, D9 forms, because N channel field-effect pipe Q1 differential concatenation is in USB current supply circuit, therefore when USB charging inlet access USB device, diode D8 and N channel field-effect pipe Q2 conducting, the over-current detection pin CS of chip U2 detects the terminal voltage of resistance R 6 through resistance R 5, when the terminal voltage of resistance R 6 is too high, while being USB charging inlet overload, chip U2 controls N channel field-effect pipe Q2 and turn-offs, thereby play the object of overload protection.

Claims (1)

1. a duplicate supply USB electric supply installation, comprises high-energy-density storage battery and USB charging inlet, it is characterized in that, this device also comprises dual power supply drive circuit, USB electrical source exchange control circuit and USB output control circuit, wherein,

Described dual power supply drive circuit is comprised of AC/DC voltage stabilizing circuit, battery charger, DC/DC decompression voltage regulator and DC/DC voltage boosting and stabilizing circuit, wherein, the ac input end of AC/DC voltage stabilizing circuit is electrically connected to city, and DC output end connects respectively the input of DC/DC decompression voltage regulator and the control end of USB electrical source exchange control circuit; Battery charger is the charge management circuit with over-current over-voltage protection, and the output of this circuit is connected across on the both positive and negative polarity of storage battery; DC/DC decompression voltage regulator has two-way output, and a road is connected to USB charging inlet through USB output control circuit, and another road is connected with the input of battery charger; The input of DC/DC voltage boosting and stabilizing circuit is connected across on the both positive and negative polarity of storage battery;

Described USB electrical source exchange control circuit is a contactless electronic beam switch circuit, and wherein, the input of this circuit is connected with the output of DC/DC voltage boosting and stabilizing circuit, and output is connected to USB charging inlet through USB output control circuit;

Described USB output control circuit is comprised of USB overload protection control chip and peripheral detection control circuit thereof; wherein; the peripheral control circuit that detects is comprised of sampling resistor and the electronic switch of connecting with USB charging inlet successively; the voltage signal that wherein sampling resistor collects USB charging inlet is delivered to the test side of USB overload protection control chip, controls the turn-on and turn-off of electronic switch.

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