CN109638917A - Charging circuit and electronic equipment - Google Patents
Charging circuit and electronic equipment Download PDFInfo
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- CN109638917A CN109638917A CN201811577424.9A CN201811577424A CN109638917A CN 109638917 A CN109638917 A CN 109638917A CN 201811577424 A CN201811577424 A CN 201811577424A CN 109638917 A CN109638917 A CN 109638917A
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- H02J7/0026—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
Abstract
This application provides a kind of charging circuit and electronic equipments, including reference voltage selecting unit and the switched charge unit being connected with reference voltage selecting unit；Wherein: reference voltage selecting unit, for selecting potential minimum as the reference voltage between supply voltage end and ground terminal, and output reference voltage；Switched charge unit, for receiving reference voltage, and according to the difference between the voltage and reference voltage at supply voltage end, the on-off of the connection between the supply voltage end of output control Signal-controlled switch charhing unit and the charging master unit of the switched charge unit；Wherein, if the voltage at supply voltage end is equal to reference voltage, the connection that control signal controls between the supply voltage end and the charging master unit of the switched charge unit disconnects, charging circuit provided by the invention is when negative pressure occurs in supply voltage end, the negative surge that switched charge chip generates due to negative pressure occurs in supply voltage end is avoided, the damage to switch charging chip itself.
Description
Technical field
The present invention relates to technical field of integrated circuits, and in particular to a kind of charging circuit and electronic equipment.
Background technique
With the development of science and technology, the charging modes of portable electronic product are more and more diversified.It is existing quickly to fill
Electric mode mainly has low-voltage, high-current quick charge and high-voltage high-speed charging.Current high-voltage high-speed charging is using raising charging
The mode of voltage realizes quick charge.Existing high-voltage charging voltage is outer in addition to basic 5V normal pressure charging, also support 9V with
The high-voltage charging of 12V.In existing high-voltage high-speed charging circuit configuration, due to needing support high-voltage charging, so in circuit
Switching tube be all high-voltage tube.Since switching tube is high-voltage tube, so switching tube can be one in parallel between its source electrode and drain electrode
Diode constitutes switch tube body.In high-voltage high-speed charging circuit configuration, because the diode steering of different switch tube bodies is different,
So being mutually isolated between supply voltage end and the output port of switched charge chip when not using switched charge chip
, prevent between supply voltage end and output port that there are leakage paths.
Using high-voltage high-speed charging by the way of, when being charged using switched charge chip to portable electronic product,
The hot plug at supply voltage end in switched charge chip can generate positive and negative surge voltage, so existing at supply voltage end
The supply voltage end of switched charge chip be generally resistant to the even higher voltage of DC-2V in setting.The surge of positive direction is
The surge propagated from supply voltage end toward switched charge chip internal circuits direction, the surge of negative direction is from switched charge core
The surge that piece internal circuit is propagated toward supply voltage extreme direction.
For the surge of negative direction, often ignores in the design to integrated circuit, shown according to data survey, due to
Caused by the negative surge in supply voltage end switched charge wafer damage account for wafer damage ratio it is higher and higher.Therefore it provides one
Kind charging circuit becomes those skilled in the art to the damage of switch charging chip to avoid the negative surge that supply voltage end generates
Technical problem urgently to be resolved.
Summary of the invention
Based on above-mentioned the shortcomings of the prior art, the present invention provides a kind of charging circuit, works as supply voltage end to realize
When there is negative pressure, the propagation of negative surge is cut off, avoids damage of the negative surge to switch charging chip.
To achieve the goals above, the embodiment of the present invention provides the following technical solutions:
First aspect present invention discloses a kind of charging circuit, comprising:
Reference voltage selecting unit and the switched charge unit being connected with the reference voltage selecting unit；Wherein:
The reference voltage selecting unit, for selecting potential minimum as reference between supply voltage end and ground terminal
Voltage, and export the reference voltage；
The switched charge unit, for receiving the reference voltage, and according to the voltage at the supply voltage end and institute
The difference between reference voltage is stated, output control signal controls the supply voltage end of the switched charge unit and the switch fills
The on-off of connection between the charging master unit of electric unit；Wherein, if the voltage at the supply voltage end is equal to the reference electricity
When pressure, the connection that the control signal controls between the supply voltage end and the charging master unit of the switched charge unit is disconnected
It opens.
Optionally, in above-mentioned charging circuit, the reference voltage selecting unit, comprising:
It is the first transistor and second transistor of NMOS transistor；
The control terminal of the first transistor connects ground terminal, and first end receives the voltage at the supply voltage end, and second
End is connected with the second end of the second transistor；
The control terminal of the second transistor receives the voltage at the supply voltage end, and first end connects the ground terminal；
Wherein, the common end of the first transistor and second transistor is as the output end with reference to selecting unit
Mouthful, export the reference voltage.
Optionally, in above-mentioned charging circuit, the switched charge unit is set to the supply voltage end for controlling
The on-off of switching tube between the charging master unit of the switched charge unit, realizes the confession for controlling the switched charge unit
The on-off of the connection of the charging master unit of piezoelectric voltage end and the switched charge unit.
Optionally, in above-mentioned charging circuit, driving unit in the switched charge unit is selected with the reference voltage
It selects unit to be connected, for receiving the reference voltage, and according between the voltage and the reference voltage at the supply voltage end
Difference, control the on-off of the switching tube.
Optionally, in above-mentioned charging circuit, the driving unit, comprising:
One end connects the resistance at the supply voltage end, wherein the other end of the resistance is grounded by zener diode；
The charge pump that first input end is connected with the resistance, wherein described in the second input terminal connection of the charge pump
Supply voltage end；The third transistor that first end is connected with the output end of the charge pump, wherein the third transistor is
NMOS tube, the control terminal of the third transistor receive enable signal, and second end receives the reference voltage；
Wherein, output port of the common end of the charge pump and the third transistor as the driving unit, is used
In the control terminal for connecting the switching tube.
Optionally, in above-mentioned charging circuit, if switched charge unit output control signal controls at the switching tube
In off-state, the received enable signal of the control terminal of the third transistor controls the third transistor conducting.
Optionally, in above-mentioned charging circuit, the switching tube, comprising: the transistor with diode.
Optionally, in above-mentioned charging circuit, the switching tube is also connected with diode；Wherein, the anode of the diode
It is connected with the second end of the switching tube, the cathode of the diode is connected with the first end of the switching tube.
Second aspect of the present invention discloses a kind of electronic equipment, comprising: any one as disclosed in first aspect present invention
The charging circuit.
It can be seen from the above technical proposal that reference voltage selecting unit is used in charging circuit provided by the invention
Potential minimum is selected as the reference voltage between supply voltage end and ground terminal, and output reference voltage；Switched charge unit connects
Reference voltage is received, and according to the difference between the voltage and reference voltage at supply voltage end, output control Signal-controlled switch fills
The on-off of connection between the supply voltage end of electric unit and the charging master unit of switched charge unit；Wherein, if supply voltage end
Voltage be equal to reference voltage, then control filling for supply voltage end in Signal-controlled switch charhing unit and switched charge unit
Connection between electric master unit disconnects.When negative pressure occurs in supply voltage end, reference voltage selecting unit is selected most at this time
Low potential is the voltage at supply voltage end, equal between the voltage and reference voltage at supply voltage end at this time, then controls signal
Connection between supply voltage port in control switch charhing unit and the charging master unit of switched charge unit disconnects, and blocks
The propagation of negative surge, avoids the negative surge that switched charge chip generates due to negative pressure occurs in supply voltage end, fills to switch
The damage of electrical chip itself.
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 only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
The circuit structure diagram of charging circuit in the existing switched charge chip of Fig. 1；
The circuit diagram of part charging circuit in the existing switched charge chip of Fig. 2；
The conducting schematic of switching tube in the existing switched charge chip of Fig. 3；
Fig. 4 is a kind of structure chart of charging circuit disclosed in the embodiment of the present application；
Fig. 5 is a kind of circuit diagram of charging circuit disclosed in the embodiment of the present application；
Fig. 6 is the structure chart of switching tube in a kind of charging circuit disclosed in the embodiment of the present application；
Fig. 7 is the conducting schematic of switching tube in a kind of charging circuit disclosed in the embodiment of the present application.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Currently, the charging circuit of existing switched charge chip, can also be referred to as switch and fill unit, as shown in Figure 1, packet
Include switched charge chip 100 and its peripheral circuit, wherein switched charge chip 100 can be divided mainly into charging master unit 101,
Switching tube Q1 and blocking tube driving.
Specifically, the input port of switched charge unit is the supply voltage end VBUS of switched charge chip 100, output end
Mouth is output voltage terminal Vsys.Supply voltage end VBUS and charge main list of the switching tube Q1 for coupling cock charging chip 100
The communications ports of member 101, switching tube Q1 and charging master unit 101 are commonly referred to as the port PMID.Also, blocking tube driving can also
The referred to as driving unit of switching tube Q1, for realizing the control of switch tube Q1 cut-off.
The circuit of the driving unit 201 of switching tube Q1 in existing switch chip charging circuit, referring to fig. 2.Driving unit
201 receive the voltage of supply voltage end VBUS, and according to the voltage of supply voltage end VBUS and driving voltage Vcp control switch pipe
The on-off of Q1.
Wherein, driving unit 201 includes:
The resistance R1 of one end connection supply voltage end VBUS, wherein the other end of resistance R1 is connect by zener diode Z1
Ground.
The charge pump 202 that first input end is connected with resistance R1, wherein the second input terminal of charge pump 202 connects power supply
Voltage end VBUS.
It should be noted that the first input end of charge pump 202 receives the supply voltage VCC generated by resistance R1.
The third transistor N3 that first end is connected with the output end of charge pump 202, wherein third transistor N3 is NMOS
Pipe, the control terminal of third transistor N3 receive enable signal ENN, second end ground connection.
Wherein, output port of the common end of charge pump 202 and third transistor N3 as driving unit, is opened for connecting
Close the control terminal of pipe Q1, and outputting drive voltage Vcp.
Because the second end of switching tube Q1 is connected with supply voltage end VBUS, the output end of control terminal and driving unit 201
Mouth is connected, so the on-off of switching tube Q1 is carried out by the voltage of the driving voltage Vcp and supply voltage end VBUS of driving circuit 201
Control.When unlatching electricity of the voltage difference of driving voltage Vcp and supply voltage end VBUS in driving unit greater than switching tube Q1
When pressure, switching tube Q1 is in the conductive state, and charging circuit has electric current to pass through at this time, and switched charge chip is in charged state.Its
In, the drain electrode of switching tube is first end, source electrode is second end, grid is control terminal.
Since the port of supply voltage end VBUS is USB port, so charging circuit can be held when being charged
The hot plug of mouth, but in hot plug, supply voltage end (i.e. USB port) can generate positive and negative surge.
When negative surge occurs in supply voltage end, referring to Fig. 3, because the potential state of the control terminal of switching tube Q1 is ground electricity
Position, when the voltage of supply voltage end VBUS is -2V, switching tube Q1 reaches cut-in voltage, and switching tube Q1 is connected, at this time switching tube
There is electric current to flow through in Q1, the flow direction of electric current is the direction from switching tube first end toward second end, at this point, since switching tube Q1 is in
On state, negative surge can be traveled in the circuit being connected with switching tube by switching tube, and to the electricity being connected with switching tube
Component in road generates negative surge damage, so as to cause the damage of switched charge chip.
In view of the above-mentioned problems, the embodiment of the present application proposes a kind of charging circuit, when negative pressure occurs in supply voltage end, make
Switching tube in switched charge chip disconnects, and negative surge has been blocked to propagate in the circuit being connected with switching tube by switching tube,
Avoid damage of the negative surge generated when supply voltage end to switch charging chip.
Refering to Fig. 4, a kind of charging circuit disclosed in the embodiment of the present application, comprising:
Reference voltage selecting unit 401 and the switched charge unit 402 being connected with reference voltage selecting unit 401.
Reference voltage selecting unit 401, for selecting potential minimum as reference between supply voltage end and ground terminal
Voltage, and output reference voltage.Wherein, the voltage of ground terminal is ground potential, as 0V.The voltage at supply voltage end is variable,
Changed according to the change of the voltage value at input supply voltage end.
Switched charge unit 402, for receiving reference voltage, and according between the voltage and reference voltage at supply voltage end
Difference, output control Signal-controlled switch charhing unit 402 supply voltage end and switched charge unit charging master unit
Between connection on-off.Wherein, if the voltage at supply voltage end is equal to reference voltage, control signal controls supply voltage end
Connection between the charging master unit of switched charge unit disconnects.
In the present embodiment, when negative pressure occurs in supply voltage end, reference voltage selecting unit is selected minimum at this time
Current potential be supply voltage end voltage, at this time between the voltage and reference voltage at supply voltage end voltage it is equal, then control letter
Connection between the charging master unit at supply voltage end and switched charge unit in number control switch charhing unit disconnects, and blocks
The propagation of negative surge, avoids the negative surge that switched charge chip generates due to negative pressure occurs in supply voltage end, fills to switch
The damage of electrical chip itself.
Optionally, referring to Fig. 5, in another embodiment of the application, a kind of embodiment party of reference voltage selecting unit 501
Formula, comprising:
It is the first transistor N1 and second transistor N2 of NMOS transistor.
The control terminal of the first transistor N1 connects ground terminal, and first end receives the voltage of supply voltage end VBUS, second end
It is connected with the second end of second transistor N2.
The control terminal of second transistor N2 receives the voltage of supply voltage end VBUS, and first end connects ground terminal.
Wherein, the output of the common end of the first transistor N1 and second transistor N2 selecting unit 501 as the reference voltage
Port, output reference voltage Prt_gnd.
It should be noted that when the voltage of supply voltage end VBUS is negative pressure, in reference voltage selecting unit 501 the
The control terminal voltage of one transistor N1 is 0V, and the voltage of second end is the voltage of supply voltage end VBUS, due to the first transistor
There are pressure differences between the control terminal and second end of N1, so the first transistor N1 is in the conductive state, and second transistor N2
Control terminal voltage is the negative pressure of supply voltage end VBUS, and the voltage of first end is the voltage of ground terminal, so second transistor N2
In not on-state.At this point, it is reference voltage that reference voltage selecting unit 501, which selects the voltage of supply voltage end VBUS, ginseng
The reference voltage Prt_gnd for examining the output of selecting unit 501 is the voltage of supply voltage end VBUS.Wherein, the control terminal of transistor
For grid, first end is drain electrode, and second end is source electrode, and the voltage of ground terminal is 0V.
When the voltage at supply voltage end is equal to 0V, with reference to the first transistor N1 and the second crystal in selecting unit 501
The control terminal voltage of pipe N2 is 0V, and the voltage of first end is also 0V, therefore the first transistor N1 and second transistor N2 locate
In not on-state.Since the first transistor N1 and second transistor N2 are not turned on, so the first transistor N1 and second is brilliant
The reference voltage Prt_gnd of the common end output of body pipe N2 is ground potential, as 0V.
Second transistor N2 control when the voltage of supply voltage end VBUS is greater than 0V, in reference voltage selecting unit 501
End voltage processed is the voltage that supply voltage end is greater than 0V, and the voltage of first end is the voltage of ground terminal, due to second transistor N2
Control terminal and first end between there are pressure differences, so second transistor N2 is in the conductive state, and the control of the first transistor N1
End voltage processed is the voltage of ground potential, and first end is the voltage of supply voltage end VBUS, is not led so the first transistor N1 is in
Logical state.Reference voltage selecting unit 501 selects the voltage of ground terminal for reference voltage at this time, exports with reference to selecting unit 501
Reference voltage Prt_gnd be ground terminal voltage.Wherein, the control terminal of transistor is grid, and first end is drain electrode, second end
For source electrode, the voltage of ground terminal is 0V.
Optionally, in another embodiment of the application, switched charge unit, for control be set to supply voltage end with
Switched charge unit charging master unit between switching tube on-off, realize control switch charhing unit supply voltage end with
The on-off of connection between the charging master unit of switched charge unit.
It should be noted that in switched charge unit, at supply voltage end and the main list of charging for opening switched charge unit
It is provided with switching tube between member, by the on-off of control switch pipe, can control the supply voltage end of switched charge unit and open
Close the on-off of the connection between the charging master unit of charhing unit.
It should also be noted that, switched charge unit in this embodiment only when negative pressure occurs in supply voltage end, is adopted
With the mode of reference selecting unit output reference voltage, the on-off of switching tube in control switch charhing unit.When supply voltage end
When in normal work, other components in the on off operating mode and switched charge unit of the middle switching tube of switched charge unit
Working condition is no different with charging circuit in the prior art, is just repeated no more herein.
Also, in switched charge unit, except through the switching tube in its driving unit, reference voltage selecting unit is received
Except the reference voltage of output comprising the structures of other components be also equal to charging circuit in the prior art, substantially
On be also configured as the form of switched charge chip.
Certainly, the reference voltage selecting unit introduced in the present embodiment, also can integrate in the circuit of switched charge unit
In plate, a switched charge chip is formed；It can certainly be arranged to the peripheral circuit of switched charge chip.
Optionally, in another embodiment of the application, driving unit in switched charge unit is selected with reference voltage
Unit is connected, for receiving reference voltage, and according to the difference between the voltage and reference voltage at supply voltage end, control switch
The on-off of pipe.
It should be noted that the on-off of switching tube is carried out by the driving unit in switched charge unit in switched charge unit
Control, the control terminal of switching tube are connected with the output port of driving unit, and the second end of switching tube is connected with supply voltage end,
In, the second end of switching tube is source electrode, and control terminal is grid.When the gate source voltage of switching tube reaches cut-in voltage, switching tube is led
It is logical.
Optionally, in another embodiment of the application, referring to Fig. 5, driving unit 502, comprising:
The resistance R1 of one end connection supply voltage end VBUS, wherein the other end of resistance R1 is connect by zener diode Z1
Ground.
The charge pump 503 that first input end is connected with resistance R1, wherein the second input terminal of charge pump 503 connects power supply
Voltage end VBUS.The third transistor N3 that first end is connected with the output end of charge pump 503, wherein third transistor N3 is
NMOS tube, the control terminal of third transistor N3 receive enable signal ENN, and second end receives reference voltage prt_gnd.
Wherein, output port of the common end of charge pump 503 and third transistor N3 as driving unit, is opened for connecting
Close the control terminal of pipe.
It should be noted that when supply voltage end VBUS voltage in a certain range, charge pump 503 passes through charge pump
503 the second input terminal receives the voltage of supply voltage end VBUS, and amplifies to it, then passes through the defeated of charge pump 503
Exit port outputting charge pump output voltage Vcp.When the voltage of supply voltage end VBUS is greater than certain value, zener diode Z1 quilt
Reverse breakdown, resistance R1 have electric current to flow through, and the first input end of charge pump 503 receives the supply voltage for flowing through resistance R1 at this time
Vcc, and it is amplified, then pass through the output voltage Vcp of the output port outputting charge pump of charge pump 503.Setting electricity
The first input port and second output terminal mouth of lotus pump 503 are when be in different value for the voltage of supply voltage end VBUS, electric
Lotus pump 503 can amplify the voltage of supply voltage end VBUS and defeated according to the voltage of different supply voltage end VBUS
The output voltage Vcp of charge pump out, is maintained the normal work of charging circuit.
It should be further noted that the on off operating mode of third transistor N3 is controlled by enable signal ENN.If switch fills
The output control of electric unit 502 Signal-controlled switch pipe Q1 is in an off state, and the control terminal of third transistor N3 is received enabled
Signal ENN controls third transistor N3 conducting, is at this time switching tube Q1 control by third transistor N3, reference voltage prt_gnd
The voltage at end processed.At this moment, if supply voltage end VBUS generates negative pressure, the selected reference voltage of reference voltage selecting unit
Prt_gnd is the voltage of supply voltage end VBUS, since the voltage of switching tube Q1 control terminal is equal to the voltage of switching tube Q1 source electrode,
Therefore switching tube Q1 is in not on-state.If 502 output signal control switch pipe Q1 of switched charge unit is in the conductive state, the
The control terminal of three transistor N3 received enable signal ENN control third transistor N3 is disconnected, at this time reference voltage prt_gnd without
Method reaches the control terminal of switching tube Q1 by third transistor N3, so when reference voltage prt_gnd be not involved in or control and open
Close the working condition of each component in charhing unit 502.
Optionally, in another embodiment of the application, referring to Fig. 6, switching tube includes: the transistor with diode D1
N4。
Wherein, diode D1 is used for preferentially breakdown when transistor N4 meets with high current or big voltage, to high current
Or the big preparatory aerial drainage of voltage, protection transistor N4 so as not to transistor N4 by the damage of high current and big voltage, wherein crystal
Pipe N4 can be NMOS transistor or PMOS transistor.
Optionally, in another embodiment of the application, switching tube is also connected with diode.Wherein, the anode of diode
It is connected with the second end of switching tube, the cathode of diode is connected with the first end of switching tube.
It should be noted that the first end of switching tube is drain electrode, second end is source electrode.The drain electrode of switching tube and source electrode it
Between parallel diode, for when high current or big voltage occur in switching tube both ends, diode to be preferentially breakdown, to high current or
The preparatory aerial drainage of the big voltage of person prevents the damage of high current or big voltage switch tube.In the present embodiment, switching tube can be
Transistor is specifically as follows NMOS transistor or PMOS transistor.
In charging circuit provided by the invention, when there is negative pressure in supply voltage end, reference voltage selecting unit institute at this time
The potential minimum selected is the voltage at supply voltage end, equal between the voltage and reference voltage at supply voltage end at this time, then
Switching tube disconnects to control the charging master at supply voltage end Yu switched charge unit in control Signal-controlled switch charhing unit
Connection between unit disconnects.Since switching tube is to disconnect in switched charge unit, so negative surge can not pass through switching tube
It is propagated, avoids damage of the negative surge generated when supply voltage end to switch charging chip.
Refering to Fig. 7, when negative pressure occurs in supply voltage end, because reference voltage selecting unit selects supply voltage end VBUS
Voltage prt_gnd as the reference voltage, third transistor is in the conductive state at this time, so the confession of control switch pipe Q1 on-off
The voltage of piezoelectric voltage end VBUS is equal to reference voltage prt_gnd, therefore switching tube Q1 is in an off state.Comparison diagram 3 and Fig. 7 can
Know, when supply voltage end, negative pressure occurs in VBUS, if the charging chip, which is provided with, refers to selecting unit, switching tube Q1 is in
Off-state, no current passes through in switching tube Q1 at this time, and negative surge can not just propagate to switched charge chip interior, avoids out
Close the negative surge that charging chip generates due to negative pressure occurs in supply voltage end, the damage to switch charging chip itself.
The embodiment of the present application discloses a kind of electronic equipment, including charging circuit, which includes: reference voltage choosing
The switched charge unit selecting unit and being connected with the reference voltage selecting unit；Wherein:
The reference voltage selecting unit, for selecting potential minimum as reference between supply voltage end and ground terminal
Voltage, and export the reference voltage.
The switched charge unit, for receiving the reference voltage, and according to the voltage at the supply voltage end and institute
The difference between reference voltage is stated, output control signal controls supply voltage end and the switched charge list of the switched charge unit
The on-off of connection between the charging master unit of member；Wherein, if the voltage at the supply voltage end is equal to the reference voltage,
The connection that the control signal controls between the supply voltage end and the charging master unit of the switched charge unit disconnects.
Optionally, in another embodiment of the application, the reference voltage selecting unit, comprising:
It is the first transistor and second transistor of NMOS transistor.
The control terminal of the first transistor connects ground terminal, and first end receives the voltage at the supply voltage end, and second
End is connected with the second end of the second transistor.
The control terminal of the second transistor receives the voltage at the supply voltage end, and first end connects the ground terminal.
The common end of the first transistor and second transistor exports the reference as the output port with reference to selecting unit
Voltage.
Optionally, in another embodiment of the application, the switched charge unit is set to the power supply electricity for controlling
The on-off of switching tube between pressure side and the charging master unit of switched charge unit, realizes the confession for controlling the switched charge unit
The on-off of connection between piezoelectric voltage end and the charging master unit of switched charge unit.
Optionally, in another embodiment of the application, driving unit in the switched charge unit, with described with reference to electricity
Selecting unit is pressed to be connected, for receiving the reference voltage, and according to the voltage and the reference voltage at the supply voltage end
Between difference, control the on-off of the switching tube.
Optionally, in another embodiment of the application, the driving unit, comprising:
One end connects the resistance at the supply voltage end, wherein the other end of the resistance is grounded by zener diode.
The charge pump that first input end is connected with the resistance, wherein described in the second input terminal connection of the charge pump
Supply voltage end；The third transistor that first end is connected with the output end of the charge pump, wherein the third transistor is
NMOS tube, the control terminal of the third transistor receive enable signal, and second end receives the reference voltage.
Wherein, output port of the common end of the charge pump and the third transistor as the driving unit, is used
In the control terminal for connecting the switching tube.
Optionally, in another embodiment of the application, if being opened described in switched charge unit output control signal control
It closes pipe to be in an off state, the received enable signal of the control terminal of the third transistor controls the third transistor conducting.
Optionally, in another embodiment of the application, the switching tube, comprising: the transistor with diode.
Optionally, in another embodiment of the application, the switching tube is also connected with diode；Wherein, the diode
Anode be connected with the second end of the switching tube, the cathode of the diode is connected with the first end of the switching tube.
It should be noted that in electronic equipment disclosed in above-mentioned several embodiments of the application, charging circuit it is specific
Structure and the course of work, reference can be made to the content of the embodiment of corresponding charging circuit, details are not described herein again.
In specific implementation, it is total to can include but is not limited to mobile phone, tablet computer, other general serials for the electronic equipment
Line (Universal Serial Bus, USB) interface equipment etc..
Professional technician can be realized or using the present invention.Profession of the various modifications to these embodiments to this field
It will be apparent for technical staff, the general principles defined herein can not depart from spirit or model of the invention
In the case where enclosing, realize in other embodiments.Therefore, the present invention will not be limited to the embodiments shown herein,
And it is to fit to the widest scope consistent with the principles and novel features disclosed herein.
It should also be noted that, herein, relational terms such as first and second and the like are used merely to one
Entity or operation are distinguished with another entity or operation, without necessarily requiring or implying between these entities or operation
There are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant are intended to contain
Lid non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
Claims (9)
1. a kind of charging circuit characterized by comprising
Reference voltage selecting unit and the switched charge unit being connected with the reference voltage selecting unit；Wherein:
The reference voltage selecting unit, for selecting potential minimum as with reference to electricity between supply voltage end and ground terminal
Pressure, and export the reference voltage；
The switched charge unit, for receiving the reference voltage, and according to the voltage at the supply voltage end and the ginseng
Examine the difference between voltage, output control signal control the switched charge unit supply voltage end and the switched charge list
The on-off of connection between the charging master unit of member；Wherein, if the voltage at the supply voltage end is equal to the reference voltage,
The connection that the control signal controls between the supply voltage end and the charging master unit of the switched charge unit disconnects.
2. charging circuit according to claim 1, which is characterized in that the reference voltage selecting unit, comprising:
It is the first transistor and second transistor of NMOS transistor；
The control terminal of the first transistor connects ground terminal, and first end receives the voltage at the supply voltage end, second end with
The second end of the second transistor is connected；
The control terminal of the second transistor receives the voltage at the supply voltage end, and first end connects the ground terminal；
Wherein, the common end of the first transistor and second transistor is defeated as the output port with reference to selecting unit
The reference voltage out.
3. charging circuit according to claim 1, which is characterized in that the switched charge unit is set to for controlling
The on-off of switching tube between the supply voltage end and the charging master unit of the switched charge unit, realizes and opens described in control
Close the on-off of the connection between the supply voltage end of charhing unit and the charging master unit of the switched charge unit.
4. charging circuit according to claim 3, which is characterized in that the driving unit in the switched charge unit, with
The reference voltage selecting unit is connected, for receiving the reference voltage, and according to the voltage at the supply voltage end and institute
The difference between reference voltage is stated, the on-off of the switching tube is controlled.
5. charging circuit according to claim 4, which is characterized in that the driving unit, comprising:
One end connects the resistance at the supply voltage end, wherein the other end of the resistance is grounded by zener diode；
The charge pump that first input end is connected with the resistance, wherein the second input terminal of the charge pump connects the power supply
Voltage end；The third transistor that first end is connected with the output end of the charge pump, wherein the third transistor is NMOS
Pipe, the control terminal of the third transistor receive enable signal, and second end receives the reference voltage；
Wherein, output port of the common end of the charge pump and the third transistor as the driving unit, for connecting
Connect the control terminal of the switching tube.
6. charging circuit according to claim 5, which is characterized in that if switched charge unit output control signal control
It makes the switching tube to be in an off state, the received enable signal of the control terminal of the third transistor controls the third crystal
Pipe conducting.
7. charging circuit according to claim 5, which is characterized in that the switching tube, comprising:
Transistor with diode.
8. charging circuit according to claim 5, which is characterized in that the switching tube is also connected with diode；Wherein, institute
The anode for stating diode is connected with the second end of the switching tube, the first end phase of the cathode of the diode and the switching tube
Even.
9. a kind of electronic equipment characterized by comprising the charging circuit as described in claim 1 to 8 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811577424.9A CN109638917B (en) | 2018-12-20 | 2018-12-20 | Charging circuit and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811577424.9A CN109638917B (en) | 2018-12-20 | 2018-12-20 | Charging circuit and electronic equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116455006A (en) * | 2022-01-07 | 2023-07-18 | 荣耀终端有限公司 | Charging circuit, electronic equipment and charging system |
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Also Published As
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| CN109638917B (en) | 2023-10-13 |
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