CN209730862U - A kind of charging control circuit and electronic product of compatible for wired charging and wireless charging - Google Patents
A kind of charging control circuit and electronic product of compatible for wired charging and wireless charging Download PDFInfo
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- CN209730862U CN209730862U CN201920707535.0U CN201920707535U CN209730862U CN 209730862 U CN209730862 U CN 209730862U CN 201920707535 U CN201920707535 U CN 201920707535U CN 209730862 U CN209730862 U CN 209730862U
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Abstract
The utility model discloses the charging control circuits and electronic product of a kind of compatible for wired charging and wireless charging, including wired plant-grid connection unit, wireless power source receiving unit, charging chip, battery, first switch circuit and second switch circuit；The charge power supply that selected unit exports is sent to charging chip by one of the first switch circuit connection cable power access unit and wireless power source receiving unit；The second switch circuit connection cable power access unit and wireless power source receiving unit block the charge power supply of the non-selected cells output in cable power access unit and wireless power source receiving unit when selected unit exports charge power supply；When selected unit is exported without charge power supply, the charge power supply that non-selected cells exports is sent to charging chip.The utility model can solve safety issue caused by charging chip is accessed because of two-way charge power supply parallel connection, while improving charging circuit reliability, it is ensured that the service life of battery.
Description
Technical field
The utility model belongs to charging circuit technical field, specifically, be related to one kind can be with compatible for wired and wireless
The charging control circuit of two kinds of charge modes and electronic product based on charging control circuit design.
Background technique
Wireless charging technology is a kind of wireless power transmission technology, using magnetic field as medium between charger and power device
Energy is transmitted, is connected between the two without electric wire, therefore, compared to traditional wired charging technology, charging operations are more convenient,
Flexibly, it has been widely used at present in fields such as mobile phone, wrist strap class wearable device, electric cars.
For electronic products such as current mobile phone, wrist strap class wearable devices, while realizing wireless charging function, in electricity
Original wired charging function can be remained with toward contact on sub- product.This electronic product is in wired charging power supply and wireless charging
Under conditions of the single access of power supply, the charge power supply for being linked into electronic product can be transmitted to the power input of charging chip
End, realizes single charging.Under conditions of wired charging power supply and wireless charging power supply access, there can be wired charging power supply
The case where being all linked into the power input of charging chip with wireless charging power supply will cause charging chip because two-way charges in this way
Power sources in parallel accesses and makes the charging current for flowing through charging chip excessive, and then leading to entire power-supply system, there are security risks
The problem of, while also influencing whether the service life of battery, reduce the reliability that electronic product uses.
Summary of the invention
The purpose of this utility model is to provide a kind of charging control circuits of compatible for wired charging and wireless charging, it is intended to
Existing charging circuit is solved when wired charging power supply and wireless charging power supply access, it is hidden safely to charging chip bring
Suffer from.
In order to solve the above technical problems, the utility model is achieved using following technical scheme:
In one aspect, the utility model proposes a kind of compatible for wired charging and wireless charging charging control circuit,
Including wired plant-grid connection unit, wireless power source receiving unit, charging chip, battery, first switch circuit and second switch electricity
Road；Wherein, the cable power access unit receives external power supply using wired mode, and exports wired charging power supply；It is described
Wireless power source receiving unit receives external power supply using wireless mode, and exports wireless charging power supply；The electricity of the charging chip
Source input terminal receives the wired charging power supply or wireless charging power supply, and output end connects battery, charges the battery control；
The first switch circuit connection selectes unit, and the selected unit is that the cable power access unit and wireless power source receive
One of unit；The first switch circuit is when selected unit exports charge power supply, charging that selected unit is exported
Power supply is sent to the power input of the charging chip；Cable power access unit described in the second switch circuit connection and
Wireless power source receiving unit blocks the cable power access unit and wireless power source when selected unit exports charge power supply
The charge power supply of non-selected cells output in receiving unit；When selected unit is exported without charge power supply, by non-selected cells
The charge power supply of output is sent to the power input of the charging chip.
The first preferred circuit design scheme as the first switch circuit and second switch circuit: described first opens
Powered-down road includes switching diode, and the anode of the switching diode connects the selected unit, and cathode connects the charging core
The power input of piece；The second switch circuit includes PMOS tube, without parasitic diode, the PMOS inside the PMOS tube
The grid of pipe connects the selected unit, and is grounded by pull down resistor, and the source electrode of the PMOS tube connects the non-selected list
Member, the drain electrode of the PMOS tube connect the power input of the charging chip.
Second of preferred circuit design scheme as the first switch circuit and second switch circuit: described first opens
Powered-down road includes switching diode, and the anode of the switching diode connects the selected unit, and cathode connects the charging core
The power input of piece；The second switch circuit includes the PMOS that anti-back biased diode and endophyte have body diode；Its
In, the grid of the PMOS tube connects the selected unit, and is grounded by pull down resistor, the source electrode and body two of the PMOS tube
The cathode of pole pipe connects the non-selected cells, and the drain electrode of the PMOS tube is connected with the anode of body diode described prevents reverse-biased two
The cathode of the anode of pole pipe, the anti-back biased diode connects the power input of the charging chip.
The third preferred circuit design scheme as the first switch circuit and second switch circuit: described first opens
Powered-down road includes switching diode, and the anode of the switching diode connects the selected unit, and cathode connects the charging core
The power input of piece；The second switch circuit includes analog switch chip, the analog switch chip include common end, often
Beginning, normal-closed end and enable end；Wherein, the common end connects the power input of the charging chip；The normally opened termination
Ground, the normally open end connect the common end by normally opened contact in the inside of the analog switch chip；The normal-closed end connects
Connect the non-selected cells, the normal-closed end connects in the inside of the analog switch chip by normally-closed contact described public
End；The enable end high level is effective, connects the selected unit.
In order to meet analog switch chip enable end interface voltage requirement, analog switch chip described in preferred design
Enable end connects the selected unit by resistance pressure-dividing network, the charging electricity for being exported selected unit using resistance pressure-dividing network
After source is divided into the interface voltage met the requirements, it is resent to the enable end of the analog switch chip.
There is charge power supply output in selected unit in order to prevent, and when non-selected cells is exported without charge power supply, it selectes single
The case where charge power supply of member output is flowed backward to non-selected cells appearance, analog switch chip described in the utility model preferred design
Common end connect the anode of an anti-back biased diode, the cathode of the anti-back biased diode connects the power supply of the charging chip
Input terminal.
Further, the analog switch chip further includes feeder ear, preferably connects the non-selected cells, opens simulation
Close chip only when non-selected cells has charge power supply output on electricity operation, it is energy-saving to achieve the purpose that.
In order to improve charge efficiency, preferably using the cable power access unit as the selected unit, by the nothing
Line power supply receiving unit is as the non-selected cells.That is, use has line charge always in the presence of wired charging power supply
Power supply is battery charging；It just the use of wireless charging power supply is battery charging in the absence of wired charging power supply.
Preferably, the cable power access unit is USB interface, power pins connect the first switch circuit and
Second switch circuit exports the wired charging power supply；The wireless power source receiving unit is that resonance type wireless receives circuit,
Output end connects the second switch circuit, exports the wireless charging power supply.
On the other hand, the utility model also proposed a kind of electronic product, including wired plant-grid connection unit, wireless
Power supply receiving unit, charging chip, battery, first switch circuit and second switch circuit；Wherein, the cable power access is single
Member receives external power supply using wired mode, and exports wired charging power supply；The wireless power source receiving unit uses wireless parties
Formula receives external power supply, and exports wireless charging power supply；The power input of the charging chip receives the wired charging electricity
Source or wireless charging power supply, output end connect battery, charge the battery control；The first switch circuit connection is selected single
Member, the selected unit are one of the cable power access unit and wireless power source receiving unit；Described first opens
The charge power supply that selected unit exports is sent to the electricity of the charging chip when selected unit exports charge power supply by powered-down road
Source input terminal；Cable power access unit described in the second switch circuit connection and wireless power source receiving unit, selected single
When member output charge power supply, the non-selected cells in the cable power access unit and wireless power source receiving unit is blocked to export
Charge power supply；When selected unit is exported without charge power supply, the charge power supply that non-selected cells exports is sent to described fill
The power input of electrical chip.
Compared with prior art, the advantages and positive effects of the utility model are as follows: the utility model is based on supporting there is line charge
The design of electronic products charging control circuit of electricity and wireless charging dual function, in wired charging power supply and wireless charging power supply list
Under conditions of one access, the charge power supply for being linked into electronic product can be transmitted to the power input of charging chip, realized
Single charging.And under conditions of wired charging power supply and wireless charging power supply access, it can only select charge power supply all the way
It is linked into the power input of charging chip, it is possible thereby to caused by solving charging chip because of two-way charge power supply parallel connection access
Safety issue, while improving charging circuit reliability, it is ensured that the service life of battery.The charging of the utility model
Control circuit, structure is simple, low in cost, is especially suitable for applying in the end products such as mobile phone, wrist strap class wearable device.
After the detailed description of the utility model embodiment is read in conjunction with the figure, other features and advantages of the utility model
It will become clearer.
Detailed description of the invention
In order to illustrate more clearly of the technical scheme in the embodiment of the utility model, will make below to required in embodiment
Attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is some embodiments of the utility model, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is a kind of implementation of the charging control circuit of compatible for wired charging and wireless charging that the utility model is proposed
The schematic block circuit diagram of example；
Fig. 2 is another of the charging control circuit of compatible for wired charging and wireless charging that the utility model is proposed
The schematic block circuit diagram of embodiment；
Fig. 3 is the circuit diagram of the first embodiment of first switch circuit and second switch circuit in Fig. 1；
Fig. 4 is the circuit diagram of second of embodiment of first switch circuit and second switch circuit in Fig. 1；
Fig. 5 is the circuit diagram of the third embodiment of first switch circuit and second switch circuit in Fig. 1.
Specific embodiment
Specific embodiment of the present utility model is described in more detail with reference to the accompanying drawing.
It should be noted that term " first ", " second " are used for description purposes only in the description of the present invention, and
It cannot be understood as indicating or implying relative importance.Unless otherwise clearly defined and limited, term " connected ", " connection " are answered
It is interpreted broadly, can also can also be indirectly connected through an intermediary in two elements for example, it may be being connected directly
The connection in portion.To those skilled in the art, the tool of above-mentioned term in the present invention can be understood as the case may be
Body meaning.
As shown in Figure 1, the charging control circuit of the present embodiment mainly includes wired plant-grid connection unit, wireless power source reception
The component parts such as unit, first switch circuit, second switch circuit, charging chip and battery.Wherein, cable power access unit
Charger outside being connected in charging by power supply line or the main equipment outside being connected by data line, connect in a wired fashion
The power supply (external power supply) that charger or main equipment provide is received, and then generates wired charging power supply VBUS and is transmitted to first
Switching circuit.The working characteristics of the first switch circuit is: exporting wired charging power supply VBUS in cable power access unit
In the case where, the power supply transmission line being connected between wired plant-grid connection unit and the power input IN of charging chip will have
Line charge power supply VBUS is transmitted to charging chip, and then is battery charging using wired charging power supply VBUS.Wireless power source receives
Unit wirelessly receives the power supply (external power supply) of external charger offer in charging for example with the side in magnetic field
Formula transmits energy etc., and then generates wireless charging power supply 5V_OUT and be transmitted to second switch circuit.The second switch circuit connects
It is connected to line plant-grid connection unit and wireless power source receiving unit, working characteristics is: can be exported in cable power access unit
During wired charging power supply VBUS, no matter whether wireless power source receiving unit can export wireless charging power supply 5V_OUT,
The power supply transmission line between wireless power source receiving unit and the power input IN of charging chip is cut off, line charge will only be had by reaching
Power supply VBUS accesses the purpose of design of charging chip, and charging chip is avoided to flow through because of two-way charge power supply parallel connection access
The charging current of charging chip is excessive, and entire power-supply system is then caused to there are problems that security risk appearance.Work as cable power
It is exported in access unit without wired charging power supply VBUS, and wireless power source receiving unit can export wireless charging power supply 5V_OUT
When, the power transmission line between second switch circuit communication wireless power source receiving unit and the power input IN of charging chip
Wireless charging power supply 5V_OUT is transmitted to charging chip, and then is battery charging using wireless charging power supply 5V_OUT by road.By
This, it is ensured that during the entire charging of electronic product, the charge power supply for accessing charging chip is remained all the way, to mention
The high safety of electronic product charging.
Charging control circuit shown in FIG. 1 is to receive wireless power source using cable power access unit as selected unit
The control circuit that unit is designed as non-selected cells.First switch circuit has electricity in selected unit for connecting selected unit
When source exports, the charge power supply that selected unit exports is sent to charging chip.Second switch circuit is for connecting selected unit
And non-selected cells exports non-selected cells when selected unit non-transformer exports and non-selected cells has power supply output
Charge power supply be sent to charging chip；And when selected unit and non-selected cells have power supply output, block non-selected list
Transmission of the charge power supply of member output to charging chip, merely with the charge power supply of first switch circuit transmission to charging chip
(that is, charge power supply of selected unit output) is that battery charges, and is achieved in single charging.
It is of course also possible to using wireless power source receiving unit as selected unit, using cable power access unit as non-choosing
The charging control circuit of order meta design the present embodiment, as shown in Figure 2.Nothing can be exported in wireless power source receiving unit as a result,
During line charge power supply 5V_OUT, the power supply that wireless charging power supply 5V_OUT is sent to charging chip by first switch circuit is defeated
Enter to hold IN, is battery charging using wireless charging power supply 5V_OUT.And during this period, second switch circuitry cuts cable power connects
Enter the power supply transmission line between unit and charging chip, no matter whether cable power access unit exports wired charging power supply
VBUS, the wired charging power supply VBUS will not be transmitted to charging chip, realize charge power supply to the single of charging chip
Access.During wireless power source receiving unit does not export wireless charging power supply 5V_OUT, if cable power access unit can
Wired charging power supply VBUS is exported, then the power supply between second switch circuit communication cable power access unit and charging chip passes
Wired charging power supply VBUS is sent to the power input IN of charging chip by defeated route, is using wired charging power supply VBUS
Battery charging.
In view of in two kinds of charging modes, the efficiency of wired charging is higher than the efficiency of wireless charging, therefore, this implementation
Example preferably uses circuit design shown in FIG. 1, and the priority level that wired plant-grid connection unit is arranged is higher than wireless power source and receives list
Member selects wired charging method then in the presence of wired charging power supply VBUS and wireless charging power supply 5V_OUT equal,
To accelerate the charging rate of battery.
Below using cable power access unit as selected unit, wireless power source receiving unit is as non-selected cells
Example elaborates the physical circuit design of first switch circuit and second switch circuit by three specific embodiments.
Embodiment one, as shown in figure 3, the present embodiment designs the first switch circuit using a switching diode D1,
The second switch circuit is designed without the PMOS tube Q1 cooperation pull down resistor R1 of parasitic diode using an inside.
Specifically, the anode of switching diode D1 is connected to cable power access unit, cable power access is received
The wired charging power supply VBUS of unit output.As a kind of preferred embodiment, the cable power access unit can be one
USB interface connects charger or main equipment by USB data line, receives+5V the direct current supply that charger or main equipment provide,
The anode of switching diode is transmitted to via the power pins of USB interface.The cathode connection charging core of the switching diode D1
The power input IN of piece U1, when there is wired charging power supply VBUS access in the power pins of USB interface, forward conduction makes
Wired charging power supply VBUS can be transmitted to the power input IN of charging chip U1 by switching diode D1, and then by filling
The output end BAT out-put supply VBAT of electrical chip U1, charges the battery control.
The wired charging power supply VBUS that cable power access unit is exported leads to PMOS tube Q1 as control signal
Disconnected control.That is, the grid of PMOS tube Q1 is connected to cable power access unit, such as the power pins of USB interface are connected to,
Receive wired charging power supply VBUS；Meanwhile the grid of PMOS tube Q1 being grounded by pull down resistor R1.By the source electrode of PMOS tube Q1
It is connected to wireless power source receiving unit, the wireless charging power supply 5V_OUT of wireless power source receiving unit output is received, by PMOS tube
The drain electrode of Q1 is connected to the power input IN of charging chip U1.
As a kind of preferred embodiment, the wireless power source receiving unit can receive circuit, packet using resonance type wireless
Include receiving coil, tuning circuit and current rectifying and wave filtering circuit.The working frequency points for adjusting receiving coil, make its transmitting in charger
Enter resonant state at the working frequency points of coil, efficient reception is realized with the magnetic field energy emitted transmitting coil and turns
It changes, and then after the rectified filter circuit processing of output alternating voltage, generates the wireless charging power supply 5V_OUT of direct current state.In this reality
It applies in example, the voltage of the wireless charging power supply 5V_OUT is equal with the voltage of wired charging power supply VBUS, such as is+5V straight
Galvanic electricity source.
In the absence of wired charging power supply VBUS presence, wireless charging power supply 5V_OUT, PMOS tube Q1 is because of its grid electricity
Pressure is higher than its source voltage and is in off state.At this point, the switching diode that wired charging power supply VBUS passes through forward conduction
D1 is transmitted to the power input IN of charging chip U1, and charging chip U1 is battery charging using wired charging power supply VBUS.In
During this, since PMOS tube Q1 ends, it is transmitted to the wired charging power supply VBUS of the power input IN of charging chip U1
It will not be transmitted to wireless power source receiving unit by PMOS tube Q1, thus it can be prevented that the electric current of wired charging power supply VBUS to nothing
Line power supply receiving unit flows backward, it is ensured that the safety of wireless power source receiving unit.
When wired charging power supply VBUS is not present, in the presence of wireless charging power supply 5V_OUT, the grid voltage of PMOS tube Q1
Pull down to ground by pull down resistor R1.At this point, PMOS tube Q1 because its grid voltage lower than its source voltage and source grid voltage it is big
In PMOS tube conduction voltage drop and enter saturation conduction state.After PMOS tube Q1 conducting, wireless charging power supply 5V_OUT passes through
The source electrode and drain electrode of PMOS tube Q1, is transmitted to the power input IN of charging chip U1, and charging chip U1 utilizes wireless charging electricity
Source 5V_OUT is battery charging.During this period, since wired charging power supply VBUS is not present, switching diode D1 is off shape
State, therefore, the wireless charging power supply 5V_OUT for being transmitted to the power input IN of charging chip U1 will not pass through switching diode
D1 is transmitted to cable power access unit, and it is single to thus it can be prevented that the electric current of wireless charging power supply 5V_OUT is accessed to cable power
Member is flowed backward, it is ensured that the safety of cable power access unit.
When wired charging power supply VBUS and wireless charging power supply 5V_OUT all in the presence of, PMOS tube Q1 is because of its grid voltage etc.
Off state is in its source voltage.At this point, wired charging power supply VBUS is passed by the switching diode D1 of forward conduction
The power input IN of charging chip U1 is transported to, charging chip U1 is battery charging using wired charging power supply VBUS.In this phase
Between, since PMOS tube Q1 ends, the wired charging power supply VBUS for being transmitted to the power input IN of charging chip U1 will not
It is transmitted to wireless power source receiving unit by PMOS tube Q1, to realize wired charging power supply VBUS and wireless charging power supply
5V_OUT's is effectively isolated.
Embodiment two, as shown in figure 4, the present embodiment designs the first switch circuit using a switching diode D1,
There is the PMOS tube Q2 cooperation pull down resistor R1 and anti-back biased diode D3 design described the of body diode using an endophyte
Two switching circuits.
Specifically, the anode of switching diode D1 is connected to cable power access unit, such as the power supply of USB interface
Pin receives the+5V wired charging power supply VBUS that external charger or main equipment are sent by USB data line, will open
The cathode for closing diode D1 is connected to the power input IN of charging chip U1.In wired charging power supply VBUS access, switch
Diode D1 forward conduction, wired charging power supply VBUS are transmitted to the power input of charging chip U1 by switching diode D1
IN carries out charge and discharge control to battery by charging chip U1.
Using wired charging power supply VBUS as control signal, on-off control is carried out to PMOS tube Q2.That is, by PMOS tube Q2's
Grid is connected to cable power access unit, such as is connected to the power pins of USB interface, receives wired charging power supply VBUS；
Meanwhile the grid of PMOS tube Q2 being grounded by pull down resistor R1.The source electrode of PMOS tube Q2 and the cathode of body diode are connected to
Wireless power source receiving unit receives the wireless charging power supply 5V_OUT of wireless power source receiving unit output, the drain electrode of PMOS tube Q2
The anode of anti-back biased diode D3 is connected to the anode of body diode, the cathode of anti-back biased diode D3 is connected to charging chip
The power input IN of U1.
In the present embodiment, the voltage phase of the voltage and wired charging power supply VBUS of the wireless charging power supply 5V_OUT
Deng, such as be+5V DC power supply.
In the absence of wired charging power supply VBUS presence, wireless charging power supply 5V_OUT, switching diode D1 conducting,
PMOS tube Q2 cut-off.At this point, wired charging power supply VBUS is transmitted to charging chip U1 by the switching diode D1 of forward conduction,
For battery charging.During this period, anti-back biased diode D3, which can be played, prevents the electric current of wired charging power supply VBUS to radio
The effect that source receiving unit flows backward, to ensure the safety of wireless power source receiving unit.
When wired charging power supply VBUS is not present, in the presence of wireless charging power supply 5V_OUT, switching diode D1 shutdown,
PMOS tube Q2 saturation conduction.At this point, wireless charging power supply 5V_OUT is transmitted to charging by PMOS tube Q2, anti-back biased diode D3
The power input IN of chip U1 charges for battery.During this period, switching diode D1, which can be played, prevents wireless charging power supply
The effect that the electric current of 5V_OUT flows backward to cable power access unit, to ensure the safety of cable power access unit.
When wired charging power supply VBUS and wireless charging power supply 5V_OUT all in the presence of, switching diode D1 conducting, PMOS
Pipe Q2 cut-off uses wired charging method for battery charging.During this period, anti-back biased diode D3 can play isolation two-way electricity
The effect in source.
Embodiment three, as shown in figure 5, the present embodiment designs the first switch circuit using a switching diode D1,
The second switch circuit is designed using an analog switch chip U2.
Specifically, the anode of switching diode D1 is connected to cable power access unit, such as the power supply of USB interface
Pin receives the wired charging power supply VBUS for+5V that external charger or main equipment are sent by USB data line, will
The cathode of switching diode D1 is connected to the power input IN of charging chip U1.In wired charging power supply VBUS access, open
Diode D1 forward conduction is closed, wired charging power supply VBUS is transmitted to the power input of charging chip U1 by switching diode D1
IN is held, charge and discharge control is carried out to battery by charging chip U1.
Using wired charging power supply VBUS as control signal, analog switch chip U2 is carried out making can control.In this implementation
In example, the analog switch chip U2 has been internally integrated normally opened contact all the way and all the way normally-closed contact.Wherein, normally opened contact is connected
Between the common end COM and normally open end NO of analog switch chip U2, normally-closed contact is connected on the public of analog switch chip U2
It holds between COM and normal-closed end NC.The common end COM of analog switch chip U2 is connected to the sun of an anti-back biased diode D2
The cathode of anti-back biased diode D2 is connected to the power input IN of charging chip U1 by pole.By the normal of analog switch chip U2
Beginning NO ground connection, normal-closed end NC connection wireless power source receiving unit receive the wireless charging electricity of wireless power source receiving unit output
Source 5V_OUT.The analog switch chip U2 high level of the present embodiment is enabled, and the enable end EN of analog switch chip U2 is passed through the
One divider resistance R2 is connected to cable power access unit, and is grounded by the second divider resistance R3.When cable power accesses list
When member output wired charging power supply VBUS, the first divider resistance R2 and the second divider resistance R3 form resistance pressure-dividing network, to having
Line charge power supply VBUS is divided, and is made with being converted into can satisfy the high level of the interface voltage requirement of analog switch chip U2
Energy voltage is transmitted to the enable end EN of analog switch chip U2, the enabled operation of control analog switch chip U2.
In the absence of wired charging power supply VBUS presence, wireless charging power supply 5V_OUT, analog switch chip U2's makes
Energy end EN current potential is height, and analog switch chip U2 is enabled to be run, and the normally opened contact inside control analog switch chip U2 is closed, often
Closed contact disconnects, and is connected to the common end COM of analog switch chip U2 with normally open end NO, disconnects with normal-closed end NC, makes public affairs
The current potential of COM is held to pull down to ground altogether.It is filled at this point, wired charging power supply VBUS is transmitted to by the switching diode D1 of forward conduction
The power input IN of electrical chip U1 is battery charging using wired charging power supply VBUS.During this period, anti-back biased diode D2
The current direction analog switch chip U2 of wired charging power supply VBUS can be blocked, to prevent wired charging power supply VBUS from passing through mould
The common end COM and normally open end NO of quasi- switch chip U2 releases over the ground, it is ensured that wired charging process is normally carried out.
When wired charging power supply VBUS is not present, in the presence of wireless charging power supply 5V_OUT, analog switch chip U2's makes
Can end EN current potential be it is low, analog switch chip U2 stops enabled, controls the normally opened contact inside analog switch chip U2 and disconnects, often
Closed contact closure, is connected to the common end COM of analog switch chip U2 with normal-closed end NC, disconnects with normally open end NO.At this point,
Wireless charging power supply 5V_OUT is transmitted to common end COM by the normal-closed end NC of analog switch chip U2, defeated via common end COM
Out, anti-back biased diode D2 forward conduction is controlled, and then is transmitted to the power input IN of charging chip U1, utilizes wireless charging
Power supply 5V_OUT is battery charging.During this period, switching diode D1 is turned off, and can play prevents wireless charging power supply 5V_OUT
The effect flowed backward to cable power access unit of electric current, to ensure the safety of cable power access unit.
When wired charging power supply VBUS and wireless charging power supply 5V_OUT all in the presence of, switching diode D1 conducting, simulation
Switch chip U2 high level is enabled, and the common end COM of analog switch chip U2 is connected to normally open end NO, disconnects with normal-closed end NC,
The current potential of common end COM is set to pull down to ground.Thus, it is possible to ensure that the power input IN of charging chip U1 has only received line charge
Power supply VBUS realizes single charging.During this period, anti-back biased diode D2 can block the electric current of wired charging power supply VBUS
Analog switch chip U2 is flowed to, to prevent wired charging power supply VBUS from passing through the common end COM of analog switch chip U2 and normally opened
End NO releases over the ground, it is ensured that wired charging process is normally carried out.
It is energy-saving in order to achieve the purpose that, the feeder ear VCC of analog switch chip U2 can be connected to wireless power source
Receiving unit, that is, the wireless charging power supply 5V_OUT using the output of wireless power source receiving unit is that analog switch chip U2 powers,
Make analog switch chip U2 only when there is wireless charging power supply 5V_OUT on electricity operation, to avoid the unnecessary consumption of electric energy.
It is selected unit that the various embodiments described above, which are with cable power access unit, with wireless power source receiving unit for non-choosing
The charging control circuit of order meta design.If being in turn, selected unit with wireless power source receiving unit, accessed with cable power
Unit designs charging control circuit for non-selected cells, need to only exchange the VBUS and 5V_OUT in Fig. 3-Fig. 5, can meet list
The design requirement of one charging, the present embodiment not reinflated explanation herein.
The charging control circuit compatible for wired charge power supply and wireless charging power supply of the present embodiment, in wired charging power supply and
When wireless charging power supply is independently accessed electronic product, can use and be linked into the charge power supply of electronic product is the interior of electronic product
Set battery charging；And when wired charging power supply and wireless charging power supply all access electronic product, it can automatically select and fill all the way
Power supply is battery charging, realizes single charging modes, then ensure that the safety of electronic product charging.
The electronic product of the present embodiment can be but not limited to mobile phone, wrist strap class wearable device etc. and be built-in with rechargeable battery
End product.
Certainly, the above description is not intended to limit the present invention, and the utility model is also not limited to the example above,
The variations, modifications, additions or substitutions that those skilled in the art are made in the essential scope of the utility model,
It should also belong to the protection scope of the utility model.
Claims (10)
1. a kind of charging control circuit of compatible for wired charging and wireless charging characterized by comprising
Cable power access unit uses wired mode to receive external power supply, and exports wired charging power supply；
Wireless power source receiving unit uses wireless mode to receive external power supply, and exports wireless charging power supply；
Charging chip, power input receive the wired charging power supply or wireless charging power supply, and output end connects battery, right
Battery carries out charge control；
First switch circuit, connects selected unit, and the selected unit is the cable power access unit and wireless power source
One of receiving unit；The first switch circuit exports selected unit when selected unit exports charge power supply
Charge power supply is sent to the power input of the charging chip；
Second switch circuit connects the cable power access unit and wireless power source receiving unit, exports in selected unit
When charge power supply, the charging that blocks the non-selected cells in the cable power access unit and wireless power source receiving unit to export
Power supply；When selected unit is exported without charge power supply, the charge power supply that non-selected cells exports is sent to the charging chip
Power input.
2. the charging control circuit of compatible for wired charging and wireless charging according to claim 1, which is characterized in that
The first switch circuit includes:
Switching diode, anode connect the selected unit, and cathode connects the power input of the charging chip；
The second switch circuit includes:
PMOS tube, inside without parasitic diode, grid connects the selected unit, and passes through pull down resistor ground connection, source
Pole connects the non-selected cells, and drain electrode connects the power input of the charging chip.
3. the charging control circuit of compatible for wired charging and wireless charging according to claim 1, which is characterized in that
The first switch circuit includes:
Switching diode, anode connect the selected unit, and cathode connects the power input of the charging chip；
The second switch circuit includes:
Anti- back biased diode；
PMOS tube, endophyte have body diode, and the grid of the PMOS tube connects the selected unit, and passes through drop-down electricity
Resistance ground connection, the source electrode of the PMOS tube connects non-selected cells with the cathode of body diode, the drain electrode of the PMOS tube with
The anode of body diode connects the anode of the anti-back biased diode, and the cathode of the anti-back biased diode connects the charging core
The power input of piece.
4. the charging control circuit of compatible for wired charging and wireless charging according to claim 1, which is characterized in that
The first switch circuit includes:
Switching diode, anode connect the selected unit, and cathode connects the power input of the charging chip；
The second switch circuit includes:
Analog switch chip comprising:
Common end connects the power input of the charging chip；
Normally open end, ground connection, the normally open end are connected in the inside of the analog switch chip by normally opened contact described public
End；
Normal-closed end, connects the non-selected cells, and the normal-closed end passes through normally closed touching in the inside of the analog switch chip
Point connects the common end；
Enable end, high level is effective, connects the selected unit.
5. the charging control circuit of compatible for wired charging and wireless charging according to claim 4, which is characterized in that described
The enable end of analog switch chip connects the selected unit by resistance pressure-dividing network.
6. the charging control circuit of compatible for wired charging and wireless charging according to claim 4, which is characterized in that described
The common end of analog switch chip connects the anode of an anti-back biased diode, fills described in the cathode connection of the anti-back biased diode
The power input of electrical chip.
7. the charging control circuit of the compatible for wired according to any one of claim 4 to 6 charging and wireless charging, special
Sign is that the analog switch chip further includes feeder ear, connects the non-selected cells.
8. the charging control circuit of compatible for wired charging and wireless charging according to any one of claim 1 to 6, special
Sign is that the selected unit is cable power access unit, and the non-selected cells is wireless power source receiving unit.
9. the charging control circuit of compatible for wired charging and wireless charging according to claim 8, which is characterized in that
The cable power access unit is USB interface, and power pins connect the first switch circuit and second switch electricity
Road exports the wired charging power supply；
The wireless power source receiving unit is that resonance type wireless receives circuit, and output end connects the second switch circuit, defeated
The wireless charging power supply out.
10. a kind of electronic product, which is characterized in that be provided with compatible for wired charging as claimed in any one of claims 1-9 wherein
With the charging control circuit of wireless charging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920707535.0U CN209730862U (en) | 2019-05-16 | 2019-05-16 | A kind of charging control circuit and electronic product of compatible for wired charging and wireless charging |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920707535.0U CN209730862U (en) | 2019-05-16 | 2019-05-16 | A kind of charging control circuit and electronic product of compatible for wired charging and wireless charging |
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| CN209730862U true CN209730862U (en) | 2019-12-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114421578A (en) * | 2022-03-28 | 2022-04-29 | 成都万创科技股份有限公司 | Charging management system and method for charging equipment |
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2019
- 2019-05-16 CN CN201920707535.0U patent/CN209730862U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114421578A (en) * | 2022-03-28 | 2022-04-29 | 成都万创科技股份有限公司 | Charging management system and method for charging equipment |
| CN114421578B (en) * | 2022-03-28 | 2022-06-21 | 成都万创科技股份有限公司 | Charging management system and method for charging equipment |
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