CN103997101B - A kind of charging circuit and a kind of electronic equipment - Google Patents

A kind of charging circuit and a kind of electronic equipment Download PDF

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Publication number
CN103997101B
CN103997101B CN201410257566.2A CN201410257566A CN103997101B CN 103997101 B CN103997101 B CN 103997101B CN 201410257566 A CN201410257566 A CN 201410257566A CN 103997101 B CN103997101 B CN 103997101B
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China
Prior art keywords
charging
effect tube
charging interface
power supply
interface
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CN201410257566.2A
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Chinese (zh)
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CN103997101A (en
Inventor
胡二勐
刘冰
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青岛海信移动通信技术股份有限公司
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Priority to CN201410257566.2A priority Critical patent/CN103997101B/en
Publication of CN103997101A publication Critical patent/CN103997101A/en
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Abstract

The present invention discloses a kind of charging circuit and a kind of electronic equipment, charging circuit includes the first charging interface, the second charging interface, Power Management Unit and the first field-effect tube, the positive pin of the power supply of first charging interface is connected with the charging path of the grid of the first field-effect tube, Power Management Unit respectively, the positive pin of the power supply of second charging interface is connected with one end of the first field-effect tube, and the other end of the first field-effect tube is connected with the charging path of Power Management Unit;Electronic equipment includes that above-mentioned charging circuit realizes the connection that multiple charging interfaces select one Yu Power Management Unit on the basis of not changing Power Management Unit.

Description

A kind of charging circuit and a kind of electronic equipment

Technical field

The present invention relates to circuit field more particularly to a kind of charging circuit and a kind of electronic equipment.

Background technique

Currently, more and more electronic equipments have rechargeable type electricity storage unit, electricity storage unit is charged to For the premise for meeting electronic equipment electricity consumption.

As shown in Figure 1, a kind of charging circuit in the prior art, including charging interface PIN and Power Management Unit U1, it fills The positive pin C of the power supply of electrical interface is connected by Power Management Unit U1 with electricity storage unit B, the negative pin of the power supply of charging interface G is grounded to form current loop, is accessed charging voltage by the positive pin C of the power supply of charging interface and is realized to electricity storage unit B Charging.

More and more electronic equipments have multiple charging interfaces, the especially development of wireless charging technology, so that very much Electronic equipment has line charge electrical interface and wireless charging interface.

Wireless charging technology is a kind of technical solution realized using electromagnetic conversion principle and charged to electronic equipment, is taken the lead in It is applied in the electronic equipments such as mobile phone, tablet computer.It takes the mobile phone as an example, the wireless charging technology being blended in mobile phone carries out module Change design, the wireless charging module in mobile phone is placed in the inside of mobile phone battery cover, passes through the contact being arranged on wireless charging module It is connect with cell phone mainboard circuit.Wireless charging technology and wired charging technology charging principle, in terms of completely not Together, for wireless charging technology while bringing more preferable usage experience to user, also resulting in cannot be total with wired charging technology The problem of with charging interface.This to need needle when electronic equipment is provided simultaneously with wired charging interface and wireless charging interface Independent circuit is designed to realize the connection of charging interface and Power Management Unit to each charging interface.

However, it is above-mentioned in the prior art, as the house keeper of electronic equipment charge function, Power Management Unit U1 only have with One charging path of charging interface connection, at this time when multiple charging interfaces access charging voltage is especially when wired charging interface Access charging voltage simultaneously with wireless charging interface, the connection of multiple charging interfaces and charging path become the above-mentioned prior art without The problem that method solves.

Summary of the invention

The embodiment of the present invention provides a kind of charging circuit and a kind of electronic equipment, in the base for not changing Power Management Unit On plinth, the connection that multiple charging interfaces select one Yu Power Management Unit is realized.

In order to achieve the above-mentioned object of the invention, the embodiment of the present invention adopts the following technical scheme that

In a first aspect, the embodiment of the invention provides a kind of charging circuits, comprising: the first charging interface, the second charging Mouth, Power Management Unit and the first field-effect tube,

The positive pin of the power supply of first charging interface is logical with the charging of the grid of the first field-effect tube, Power Management Unit respectively Road is connected,

The positive pin of the power supply of second charging interface is connected with one end of the first field-effect tube,

The other end of first field-effect tube is connected with the charging path of Power Management Unit.

It with reference to first aspect, in the first possible implementation, further include the second field-effect tube and voltage comparator,

The reversed input with one end of the second field-effect tube, voltage comparator respectively of the positive pin of the power supply of first charging interface End is connected,

The other end of first field-effect tube is docked with the other end of the second field-effect tube, and same with voltage comparator respectively It is connected to the charging path of input terminal, Power Management Unit,

The output end of voltage comparator is connected with the grid of the second field-effect tube.

With reference to first aspect or the first possible implementation of first aspect, in second of possible implementation In, the first charging interface can be wired charging interface or wireless charging interface, and the second charging interface can be wireless charging and connect Mouth or wired charging interface.

With reference to first aspect or the first possible implementation of first aspect, in the third possible implementation In, it further include processing unit,

First charging interface is wired charging interface, and the second charging interface is wireless charging interface,

The electricity of the positive pin of the power supply of wired charging interface, the differential signal pin of wired charging interface and wireless charging interface The positive pin in source is connected with processing unit respectively,

Processing unit carries out charge control to Power Management Unit.

With reference to first aspect or the first possible implementation of first aspect, in the 4th kind of possible implementation In, it further include first resistor,

The grid of first field-effect tube is grounded by first resistor.

The possible implementation of with reference to first aspect the first further includes in a fifth possible implementation two Pole pipe pair,

The cathode of diode pair docks, and is connected with the power input of voltage comparator,

The first anode of diode pair is connected with the positive pin of the power supply of the first charging interface, the second plate point of diode pair It is not connected with the other end of the other end of the first field-effect tube, the second field-effect tube.

The possible implementation of with reference to first aspect the first further includes in a sixth possible implementation Two resistance,

Second resistance is connected between the grid of the second field-effect tube and the other end of the first field-effect tube.

With reference to first aspect or the first possible implementation of first aspect, in the 7th kind of possible implementation In, it further include 3rd resistor,

3rd resistor is connected between the positive pin of power supply of the first charging interface and the grid of the first field-effect tube.

The third possible implementation with reference to first aspect, in the 8th kind of possible implementation, voltage conversion Unit is connected between charging interface and processing unit.

Second aspect, the embodiment of the invention provides a kind of electronic equipment, including charging circuit as described in relation to the first aspect.

The embodiment of the invention provides a kind of charging circuit and a kind of electronic equipment,

Charging circuit include the first charging interface, the second charging interface, Power Management Unit and the first field-effect tube, first The positive pin of the power supply of charging interface is connected with the charging path of the grid of the first field-effect tube, Power Management Unit respectively, and second The positive pin of the power supply of charging interface is connected with one end of the first field-effect tube, the other end and power management list of the first field-effect tube The charging path of member is connected.

When the positive pin of power supply for only passing through the first charging interface accesses charging voltage, the grid of the first field-effect tube is in High level state, one end of the first field-effect tube are in low level state, and the other end of the first field-effect tube is in high level shape State, the other end of the first field-effect tube is source electrode at this time, and the gate source voltage (VGS) of the first field-effect tube is greater than threshold voltage (Vth), the first field-effect tube is ended at this time, so that the charging of the positive pin of the power supply of the first charging interface and Power Management Unit is logical Road conducting, and the positive pin of power supply of the second charging interface and the charging path of Power Management Unit disconnect, and realize and fill by first Power supply of the positive pin of the power supply of electrical interface to Power Management Unit.

When the positive pin of power supply for only passing through the second charging interface accesses charging voltage, one end of the first field-effect tube is in High level state, the other end of the first field-effect tube are in low level state, and the grid of the first field-effect tube is in low level shape State, one end of the first field-effect tube is source electrode at this time, and the gate source voltage (VGS) of the first field-effect tube is less than threshold voltage (Vth), the first field-effect tube is connected at this time, so that the charging of the positive pin of the power supply of the second charging interface and Power Management Unit is logical Road conducting, realizes the power supply by the positive pin of power supply of the second charging interface to Power Management Unit.

When the positive pin of power supply of the positive pin of the power supply of the first charging interface and the second charging interface accesses charging voltage simultaneously When, the grid of the first field-effect tube is in high level state, and one end of the first field-effect tube is in high level state, first effect Should the other end of pipe be in high level state, the gate source voltage (VGS) of the first field-effect tube is greater than threshold voltage (Vth), at this time The cut-off of first field-effect tube, the positive pin of power supply for forming the first charging interface are connected with the charging path of Power Management Unit, and The power supply state that the positive pin of the power supply of second charging interface and the charging path of Power Management Unit disconnect, realizes and fills by first Power supply of the positive pin of the power supply of electrical interface to Power Management Unit.

In conclusion charging circuit provided in an embodiment of the present invention on the basis of not changing Power Management Unit, is realized Multiple charging interfaces select the connection of one Yu Power Management Unit.

Electronic equipment includes above-mentioned charging circuit, has beneficial effect same as above-mentioned charging circuit.

Detailed description of the invention

In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is the present invention Some embodiments for those of ordinary skill in the art without any creative labor, can be with root Other attached drawings are obtained according to these attached drawings.

Fig. 1 is a kind of charging circuit schematic diagram in the prior art;

Fig. 2 is the charging circuit schematic diagram of one kind provided in an embodiment of the present invention;

Fig. 3 is another charging circuit schematic diagram provided in an embodiment of the present invention;

Fig. 4 is another charging circuit schematic diagram provided in an embodiment of the present invention;

Fig. 5 is a kind of electronic equipment structural schematic diagram provided in an embodiment of the present invention.

PIN. the charging interface in background technique;PIN1. the first charging interface;PIN2. the second charging interface;C. background The positive pin of the power supply of charging interface in technology;G. the negative pin of the power supply of charging interface in background technique;C1. the first charging interface The positive pin of power supply;C2. the positive pin of the power supply of the second charging interface;G1. the negative pin of the power supply of the first charging interface;G2. The negative pin of the power supply of two charging interfaces;B. electricity storage unit;P1. the first field-effect tube;P2. the second field-effect tube;U1. power supply Administrative unit;U2. processing unit;R1. first resistor;R2. second resistance;R3. 3rd resistor;D. diode pair;V. voltage ratio Compared with device;E. voltage conversion unit;D+, D-. differential signal pin.

Specific embodiment

To keep objects and advantages of the present invention clearer, following will be combined with the drawings in the embodiments of the present invention, to this hair Technical solution in bright embodiment is clearly and completely described, it is clear that described embodiment is that a part of the invention is implemented Example, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creativeness Every other embodiment obtained, shall fall within the protection scope of the present invention under the premise of labour.

The positive pin access of the power supply of the positive pin of the power supply of first charging interface and the second charging interface in the embodiment of the present invention Charging voltage it is identical, in practice, charging voltage is not exactly the same, and the voltage of high level is not exactly the same, low level voltage Also not exactly the same, but there are threshold voltages for field-effect tube, so will not influence field-effect tube plays function as described in the examples Energy.

The field-effect tube used in the embodiment of the present invention is enhanced P-channel field-effect transistor (PEFT) pipe, due to the position of source electrode and drain electrode Setting will can invert according to current direction in sense of current determination in circuit and the embodiment of the present invention, so to enhanced P The definition of each electrode of channel field-effect pipe is divided into grid, one end and the other end using circuit connecting relation as foundation.Field-effect tube grid The position of pole is fixed, and one end of field-effect tube may be source electrode, it is also possible to be drained, corresponding, the other end of field-effect tube can It can be drain electrode, it is also possible to source electrode.The on or off of field-effect tube is the on or off at field-effect tube both ends.

The threshold voltage (Vth) of enhanced P-channel field-effect transistor (PEFT) pipe is negative value, when voltage difference, that is, gate-source of grid and source electrode When voltage (VGS) is less than threshold voltage (Vth), enhanced P-channel field-effect transistor (PEFT) pipe conducting;When the voltage difference of grid and source electrode is Gate source voltage (VGS) is greater than when threshold voltage (Vth), enhanced P-channel field-effect transistor (PEFT) pipe cut-off.

As shown in Fig. 2, the embodiment of the present invention provides a kind of charging circuit, comprising: the first charging interface PIN1, the second charging Interface PIN2, Power Management Unit U1 and the first field-effect tube P1,

Wherein, the first charging interface PIN1 and the second charging interface PIN2 can be in circuit with external charger interface phase The circuit interface of connection is also possible to external charger interface, and external charger interface type is unlimited, such as wired charging The 30-pin Dock data-interface and 8-pin thunder and lightning Lightning of common Micro-USB, Mini-USB, Apple Inc. connect Mouthful and the common charging module interface of wireless charging.Due to node and the pin of charger interface of circuit interface have it is corresponding Electrical connection, so the two is essential identical in the technical scheme, it is all charger output voltage disengaging electronic device circuitry Channel;

Wherein, Power Management Unit U1 is the unit for being powered centralized management in circuit to each electrical part, is had only One charging path;

Wherein, the positive pin C1 of the power supply of the first charging interface respectively with the grid of the first field-effect tube P1, power management list The charging path of first U1 is connected, and the positive pin C2 of the power supply of the second charging interface is connected with one end of the first field-effect tube P1, and first The other end of field-effect tube P1 is connected with the charging path of Power Management Unit U1, the negative pin G1 of the power supply of the first charging interface with The negative pin G2 of the power supply of second charging interface is connected to the ground, other electricity consumption devices in circuit are also connected to the ground, to constitute electricity Flow back to road.Other connection types for forming current loop are the prior art, are repeated no more.

Wherein, can access between the power supply of the first charging interface positive pin C1 and Power Management Unit U1 does not influence to charge Other electrical parts of function, can access between the other end and Power Management Unit U1 of the first field-effect tube P1 does not influence to charge Other electrical parts of function.

It recharges here in circuit, specifically,

The positive pin of power supply for accessing the first charging interface is identical as the voltage of the positive pin of the power supply of the second charging interface, practical Difference, voltage absolute value of the difference although the absolute value of threshold voltage can be not more than in.

The power supply of first charging interface positive pin C1 respectively with the grid of the first field-effect tube P1, the first field-effect tube P1 The other end, the charging path of Power Management Unit U1 are connected;

The positive pin C2 of the power supply of second charging interface is connected with one end of the first field-effect tube P1;

One end of first field-effect tube P1 is connected with the positive pin C2 of the power supply of the second charging interface, the first field-effect tube P1's The other end is connected with the charging path of the positive pin C1 of the power supply of the first charging interface, Power Management Unit U1 respectively;

The charging path of Power Management Unit U1 respectively with the positive pin C1 of the power supply of the first charging interface, the first field-effect tube The other end of P1 is connected.

When the positive pin C1 of power supply for only passing through the first charging interface accesses charging voltage, the grid of the first field-effect tube P1 In high level state, one end of the first field-effect tube P1 is in low level state, and the other end of the first field-effect tube P1 is in High level state, the other end of the first field-effect tube P1 is source electrode at this time, and the gate source voltage (VGS) of the first field-effect tube is greater than Threshold voltage (Vth), the first field-effect tube P1 ends at this time, so that the positive pin C1 of the power supply of the first charging interface and power management The charging path of unit U1 is connected, and the charging path of the positive pin C2 of the power supply of the second charging interface and Power Management Unit U1 is disconnected It opens, realizes the power supply by the positive pin C1 of power supply of the first charging interface to Power Management Unit U1.

When the positive pin C2 of power supply for only passing through the second charging interface accesses charging voltage, one end of the first field-effect tube P1 In high level state, the other end of the first field-effect tube P1 is in low level state, the positive pin of the power supply of the first charging interface C1 does not have charging voltage input, and the grid of the first field-effect tube P1 is in low level state, at this time one end of the first field-effect tube Gate source voltage (VGS) for source electrode, the first field-effect tube is less than threshold voltage (Vth), and the first field-effect tube P1 is connected at this time, So that the positive pin C2 of the power supply of the second charging interface is connected with the charging path of Power Management Unit U1, realize through the second charging Power supply of the positive pin C2 of the power supply of interface to Power Management Unit U1.

When the positive pin C2 of power supply of the positive pin C1 of the power supply of the first charging interface and the second charging interface accesses charging simultaneously When voltage, the grid of the first field-effect tube P1 is in high level state, and one end of the first field-effect tube P1 is in high level state, The other end of first field-effect tube P1 is in high level state, and the gate source voltage (VGS) of the first field-effect tube is greater than threshold voltage (Vth), the first field-effect tube P1 ends at this time, forms the positive pin C1's of power supply and Power Management Unit U1 of the first charging interface Charging path conducting, and the power supply that the charging path of the positive pin C2 of the power supply of the second charging interface and Power Management Unit U1 disconnects State realizes the power supply by the positive pin C1 of power supply of the first charging interface to Power Management Unit U1.

Further, as shown in Fig. 2, further including first resistor R1 in charging circuit, the grid of the first field-effect tube P1 is logical First resistor R1 ground connection is crossed, specifically

The one end first resistor R1 ground connection, the other end electricity with the grid of the first field-effect tube P1, the first charging interface respectively The positive pin C1 in source is connected,

The grounded-grid of first field-effect tube P1, it is ensured that the original state of grid is low level.

First resistor R1 is connected between the positive pin C1 of power supply of the first charging interface and ground, avoids the first field-effect tube P1 Grid be shorted, guarantee that the grid of the first field-effect tube P1 receives the electricity of the positive pin C1 of the power supply from the first charging interface Pressure.

Further, as shown in figure 3, charging circuit further includes voltage comparator V and the second field-effect tube P2,

The positive pin C1 of the power supply of first charging interface is anti-with one end of the second field-effect tube P2 and voltage comparator V respectively It is connected to input terminal,

The other end of first field-effect tube P1 is docked with the other end of the second field-effect tube P2, and with voltage comparator V's Noninverting input, the charging path of Power Management Unit U1 are connected,

The output end of voltage comparator V is connected with the grid of the second field-effect tube P2.

Wherein, voltage comparator V is used to compare the size of two voltage, when noninverting input voltage is higher than reverse input end When, voltage comparator V output is high level, and when noninverting input voltage is lower than reverse input end, voltage comparator V output is Low level.

Second field-effect tube P2 can belong to same type with first field-effect tube, also may belong to different type;

It recharges here in circuit, specifically,

The power supply of first charging interface positive pin C1 respectively with the grid of the first field-effect tube P1, the second field-effect tube P2 One end, the reverse input end of voltage comparator V are connected;

The positive pin C2 of the power supply of second charging interface is connected with one end of the first field-effect tube P1;

One end of first field-effect tube P1 is connected with the positive pin C2 of the power supply of the second charging interface, the first field-effect tube P1's The other end respectively with the charging path of Power Management Unit U1, the noninverting input of voltage comparator V, the second field-effect tube P2 The other end be connected, the grid of the first field-effect tube P1 respectively with the positive pin C1 of the power supply of the first charging interface, the second field-effect tube One end of P2, the reverse input end of voltage comparator V are connected;

One end of second field-effect tube P2 is connected with the positive pin C1 of the power supply of the first charging interface, the second field-effect tube P2's The other end respectively with the noninverting input of voltage comparator V, the charging path of Power Management Unit U1, the first field-effect tube P1 The other end is connected, and the grid of the second field-effect tube P2 is connected with the output end of voltage comparator V;

The noninverting input of voltage comparator V respectively with the other end of the first field-effect tube P1, the second field-effect tube P2 The other end is connected, and the noninverting input of voltage comparator V is connected with the charging path of Power Management Unit U1, voltage comparator V Reverse input end respectively with the positive pin C1 of the power supply of the first charging interface, the grid of the first field-effect tube P1 and the second field-effect One end of pipe P2 is connected, and the output end of voltage comparator V is connected with the grid of the second field-effect tube P2;

The charging path of Power Management Unit U1 respectively with the other end of the first field-effect tube P1, the second field-effect tube P2 The other end, the noninverting input of voltage comparator V are connected.

When accessing charging voltage by the positive pin C1 of the power supply of the first charging interface, one end of the second field-effect tube P2 with The reverse input end of voltage comparator V is in high level state, and the noninverting input voltage of voltage comparator V is less than reversed input Voltage is held, so that the output end of voltage comparator V exports low level, the grid of the second field-effect tube P2 is in low level shape at this time One end of state, the second field-effect tube P2 is in high level state, and one end of the second field-effect tube P2 is source electrode, second effect at this time Should pipe gate source voltage (VGS) be less than threshold voltage (Vth) so that the second field-effect tube P2 be connected.So that the first charging The positive pin C1 of the power supply of interface is connected with the charging path of Power Management Unit U1, and realization is passing through the power supply of the first charging interface just Power supply of the pin C1 to Power Management Unit U1.

It is the positive pin of power supply of the second charging interface when the charging voltage for the positive pin C1 of power supply for disconnecting the first charging interface C2 accesses charging voltage, and one end of the second field-effect tube P2 is in low level state, and the other end of the second field-effect tube P2 is in High level state, the other end of the second field-effect tube P2 is source electrode at this time, and the noninverting input voltage of voltage comparator V is higher than anti- To input terminal voltage, the output end output HIGH voltage of voltage comparator V, so that the grid of the second field-effect tube P2 is in high electricity Flat, the gate source voltage (VGS) of the second field-effect tube is greater than threshold voltage (Vth), so that the second field-effect tube P2 ends, thus It avoids the charging voltage accessed from the positive pin C2 of the power supply of the second charging interface from being output to first by the second field-effect tube P2 to fill The positive pin C1 of the power supply of electrical interface.

When the positive pin C2 of power supply of the positive pin C1 of the power supply of the first charging interface and the second charging interface accesses charging simultaneously When voltage, the grid of the first field-effect tube P1 is in high level state, and one end of the first field-effect tube P1 is in high level state, The gate source voltage (VGS) of first field-effect tube is greater than threshold voltage (Vth), and the first field-effect tube P1 ends at this time, and voltage compares The noninverting input voltage of device V is lower than reverse input end voltage, and the output end of voltage comparator V exports low-voltage, so that second The grid of field-effect tube P2 is in low level, and one end of the second field-effect tube P2 is in high level, the grid-of the second field-effect tube Source voltage (VGS) is less than threshold voltage (Vth), so that the second field-effect tube P2 is connected, is forming the power supply of the first charging interface just Pin C1 is connected with the charging path of Power Management Unit U1, and the positive pin C2 of the power supply of the second charging interface and power management list The power supply state that the charging path of first U1 disconnects is realized through the positive pin C1 of power supply of the first charging interface to Power Management Unit The power supply of U1.

Further, as shown in Fig. 2, further including diode pair D in charging circuit,

The cathode of diode pair D docks, and is connected with the power input of voltage comparator V,

The first anode of diode pair D is connected with the positive pin C1 of the power supply of the first charging interface, the second sun of diode pair D Pole is connected with the other end of the other end of the first field-effect tube P1, the second field-effect tube P2 respectively.

It recharges here in circuit, specifically,

The power supply of first charging interface positive pin C1 respectively with the grid of the first field-effect tube P1, the second field-effect tube P2 One end, the first anode of diode pair D, the reverse input end of voltage comparator V are connected;

One end of first field-effect tube P1 is connected with the positive pin C2 of the power supply of the second charging interface, the first field-effect tube P1's The other end respectively with the second plate of diode pair D, the charging path of Power Management Unit U1, voltage comparator V it is in the same direction defeated Enter end, the other end of the second field-effect tube P2 is connected, the grid of the first field-effect tube P1 power supply with the first charging interface respectively The just reverse input end phase of pin C1, one end of the second field-effect tube P2, the first anode of diode pair D, voltage comparator V Even;

One end of second field-effect tube P2 respectively with the positive pin C1 of the power supply of the first charging interface, diode pair D first The reverse input end of anode and voltage comparator V are connected, and the other end of the second field-effect tube P2 is same with voltage comparator V respectively To input terminal, the second plate of diode pair D, the charging path of Power Management Unit U1, the first field-effect tube P1 the other end It is connected, the grid of the second field-effect tube P2 is connected with the output end of voltage comparator V;

The noninverting input of voltage comparator V respectively with the other end of the first field-effect tube P1, the second field-effect tube P2 The other end, the second plate of diode pair D are connected, the noninverting input of voltage comparator V and the charging of Power Management Unit U1 Access be connected, the reverse input end of voltage comparator V respectively with the positive pin C1 of the power supply of the first charging interface, the first field-effect tube The grid of P1, the first anode of diode pair D are connected, the grid phase of the output end of voltage comparator V and the second field-effect tube P2 Even;

The first anode of diode pair D respectively with the power supply of the first charging interface positive pin C1, the first field-effect tube P1 Grid, one end of the second field-effect tube P2 are connected, and the second plate of diode pair D is another with the second field-effect tube P2 respectively End, the other end of the output end in the same direction of voltage comparator V, the first field-effect tube P1 are connected, the second plate and electricity of diode pair D The charging path of source control unit U1 is connected, and the cathode of diode pair D is connected with the power input of voltage comparator V.

The charging path of Power Management Unit U1 respectively with the other end of the first field-effect tube P1, the second field-effect tube P2 The other end, the noninverting input of voltage comparator V, the second plate of diode pair D are connected.

When the positive pin C1 of power supply for only passing through the first charging interface accesses charging voltage, by the first sun of diode pair D The positive pin C1 of the power supply of pole from the first charging interface receives voltage and the electricity by the cathode transport of diode to voltage comparator V Source input terminal, to realize the power supply to voltage comparator V.

After the second field-effect tube P2 conducting, since the received voltage of the first anode connects higher than second plate in diode pair The voltage of receipts, so that the diode pair D selection first anode is connected and powers to voltage comparator V.

When the positive pin C2 of power supply for only passing through the second charging interface accesses charging voltage, the first field-effect tube P1 conducting, It is received by the second plate of diode pair D from the other end of the first field-effect tube P1 and comes from the second charging voltage, and pass through two The cathode transport of pole pipe to voltage comparator V power input, to realize power supply to voltage comparator V.

When the positive pin C2 of power supply of the positive pin C1 of the power supply of the first charging interface and the second charging interface accesses charging simultaneously When voltage, the first field-effect tube P1 cut-off is connect by the positive pin C1 of the power supply of the first anode from the first charging interface of diode pair D Voltage and the power input by the cathode transport of diode to voltage comparator V are received, to realize the confession to voltage comparator V Electricity.

Further, as shown in figure 3, further including second resistance R2 in charging circuit, second resistance R2 is connected to second Between the grid of effect pipe P2 and the other end of the first field-effect tube P1,

It recharges here in circuit, specifically

The one end second resistance R2 is connected with the output end of the grid of the second field-effect tube P2, voltage comparator V respectively, and second The resistance R2 other end respectively with the other end of the second field-effect tube P2, the other end of the first field-effect tube P1, Power Management Unit The charging path of U1 is connected.

Second resistance R2 is pull-up resistor, makes the voltage transmission to drain from the first field-effect tube P1 to the second field-effect tube The grid of P2 guarantees that voltage comparator V is not short on the basis of the grid to the second field-effect tube P2 provides initial voltage It connects.

Further, as shown in figure 3, further including 3rd resistor R3 in charging circuit, 3rd resistor R3 is connected to first and fills Between the positive pin C1 of the power supply of electrical interface and the grid of the first field-effect tube P1, pass through the voltage divide function realization pair of 3rd resistor R3 The protection of first field-effect tube P1.

Further, the first charging interface PIN1 can be wired charging interface or wireless charging interface in charging circuit, Second charging interface PIN2 can be wireless charging interface or wired charging interface.

Further, as shown in figure 4, further including processing unit U2 in charging circuit, the first charging interface PIN1 is wired Charging interface, the second charging interface PIN2 are wireless charging interface, and the positive pin C1 of the power supply of wired charging interface, wired charging connect Differential signal pin D+, D- of mouth, the positive pin C2 of power supply of wireless charging interface are connected with processing unit respectively.

It recharges here in circuit, specifically,

The power supply of wired charging interface positive pin C1 respectively with the grid of the first field-effect tube P1, the second field-effect tube P2 One end, the reverse input end of voltage comparator V are connected, the difference of the positive pin C1 of the power supply of wired charging interface, wired charging interface Sub-signal pin D+, D- are connected with processing unit U2 respectively;

The positive pin C2 of the power supply of wireless charging interface is connected with one end of the first field-effect tube P1, the electricity of wireless charging interface The positive pin C2 in source is connected with processing unit U2;

One end of first field-effect tube P1 is connected with the positive pin C2 of the power supply of wireless charging interface, the first field-effect tube P1's One end is connected with processing unit U2, the other end of the first field-effect tube P1 respectively with the charging path of Power Management Unit U1, electricity It presses the other end of the noninverting input of comparator V, the second field-effect tube P2 to be connected, the grid of the first field-effect tube P1 and has line charge The positive pin C1 of the power supply of electrical interface is connected;

One end of second field-effect tube P2 is connected with the positive pin C1 of the power supply of wired charging interface, the second field-effect tube P2's One end is connected with processing unit U2, the other end of the second field-effect tube P2 respectively with the noninverting input of voltage comparator V, power supply The charging path of administrative unit U1, the other end of the first field-effect tube P1 are connected, the grid and voltage ratio of the second field-effect tube P2 Output end compared with device V is connected;

The noninverting input of voltage comparator V respectively with the other end of the first field-effect tube P1, the second field-effect tube P2 The other end is connected, and the noninverting input of voltage comparator V is connected with the charging path of Power Management Unit U1, voltage comparator V Reverse input end be connected respectively with the grid of the positive pin C1 of the power supply of wired charging interface, the first field-effect tube P1, voltage ratio Output end compared with device V is connected with the grid of the second field-effect tube P2, reverse input end and the processing unit U2 phase of voltage comparator V Even;

The charging path of Power Management Unit U1 respectively with the other end of the first field-effect tube P1, the second field-effect tube P2 The other end, the noninverting input of voltage comparator V are connected, and Power Management Unit U1 is connected with processing unit U2.

The processing unit U2 positive pin of power supply with the positive pin C1 of the power supply of wired charging interface and wireless charging interface respectively C2 is connected, so that processing unit U2 can be handled single with the working condition of real-time detection wired charging interface and wireless charging interface First U2 and Power Management Unit U1 are connected by controlling signal, allow processing unit U2 according to wired charging interface with wirelessly The working condition of charging interface adjusts the received charging current of Power Management Unit U1, specifically, general at present has line charge Electric appliance includes differential signal pin D+, D-, its differential signal pin of the charger of standard is in short-circuit condition, off-gauge charging Device, differential signal pin are in vacant state, and wired charging interface has differential signal pin D corresponding with wired charger +, D-, by the detection to wired charging interface differential signal pin D+, D- it can be learnt that wired charger differential signal pin D +, the state of D-, so that it is determined that the type of wired charger.For standard cable charger, biggish charging electricity can be set Stream, for off-gauge wired charger, is arranged lesser charging current, can be by modifying power supply to the control of charging current The register parameters of administrative unit U1 are realized.

Further, as shown in figure 3, further including voltage conversion unit E in charging circuit, voltage conversion unit E is connected to Between the positive pin of the power supply of charging interface and processing unit U2, voltage conversion unit E can be divider resistance and be also possible to specially Electrical level transferring chip, pass through the voltage transformation function of voltage conversion unit E, it is ensured that processing unit U2 receives safe electricity Pressure.

As shown in figure 4, the embodiment of the present invention provides a kind of electronic equipment, including above-mentioned all types of charging circuits, Electric energy from external power supply is inputted in electricity storage unit by the charging circuit, realizes the charging to electronic equipment.

Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations;Although Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features; And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and Range.

Claims (9)

1. a kind of charging circuit, including the first charging interface and Power Management Unit, it is characterised in that further include the second charging Mouth, the first field-effect tube, the second field-effect tube and voltage comparator
The positive pin of power supply of first charging interface respectively with the grid of first field-effect tube, the Power Management Unit Charging path be connected,
The positive pin of power supply of second charging interface is connected with one end of first field-effect tube,
The other end of first field-effect tube is connected with the charging path of the Power Management Unit,
The positive pin of power supply of first charging interface respectively with one end of second field-effect tube, the voltage comparator Reverse input end is connected,
The other end of first field-effect tube is docked with the other end of second field-effect tube, and respectively with the voltage ratio Charging path compared with the noninverting input of device, the Power Management Unit is connected,
The output end of the voltage comparator is connected with the grid of second field-effect tube.
2. charging circuit according to claim 1, it is characterised in that first charging interface can be wired charging and connect Mouth or wireless charging interface, second charging interface can be wireless charging interface or wired charging interface.
3. charging circuit according to claim 1, it is characterised in that it further include processing unit,
First charging interface is wired charging interface, and second charging interface is wireless charging interface,
The differential signal pin and the wireless charging of the positive pin of power supply of the wired charging interface, the wired charging interface The positive pin of the power supply of interface is connected with the processing unit respectively,
The processing unit carries out charge control to the Power Management Unit.
4. charging circuit according to claim 1, it is characterised in that it further include first resistor,
The grid of first field-effect tube is grounded by the first resistor.
5. charging circuit according to claim 1, it is characterised in that it further include diode pair,
The cathode of the diode pair docks, and is connected with the power input of the voltage comparator,
The first anode of the diode pair is connected with the positive pin of power supply of first charging interface, and the of the diode pair Two anodes are connected with the other end of the other end of first field-effect tube, second field-effect tube respectively.
6. charging circuit according to claim 1, it is characterised in that it further include second resistance,
The second resistance is connected between the grid of second field-effect tube and the other end of first field-effect tube.
7. charging circuit according to claim 1, it is characterised in that it further include 3rd resistor,
The 3rd resistor be connected to first charging interface the positive pin of power supply and first field-effect tube grid it Between.
8. charging circuit according to claim 3, it is characterised in that it further include voltage conversion unit,
The voltage conversion unit is connected between charging interface and the processing unit.
9. a kind of electronic equipment, it is characterised in that including the described in any item charging circuits of claim 1 to 7.
CN201410257566.2A 2014-06-12 2014-06-12 A kind of charging circuit and a kind of electronic equipment CN103997101B (en)

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