CN109950939A - Charger states detection circuit, circuitry and charger states detection method - Google Patents
Charger states detection circuit, circuitry and charger states detection method Download PDFInfo
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Abstract
This application discloses a kind of charger states detection circuit, circuitry and charger states detection methods.Charger states detection circuit provided by the present application includes: current source circuit, electronic switch, electronic switch control circuit, voltage detecting circuit；The input terminal of the current source circuit is connect by the electronic switch with equipment charger interface, the output end ground connection of the current source circuit；The input terminal of the electronic switch control circuit is connect with the output end of the voltage detecting circuit, the output end of the electronic switch control circuit is connect with the electronic switch, and the electronic switch control circuit is used to export control signal to the electronic switch according to the output of the voltage detecting circuit；The voltage detecting circuit is used to detect the voltage of the equipment charger interface.
Description
Technical field
The present invention relates to power technique fields more particularly to a kind of charger states detection circuit, circuitry and fill
Electrical equipment state checks method.
Background technique
Handheld multimedia devices usually have charger interface, and charger can be connected to the interface so as to hand-hold multimedia
Equipment charge.Changed according to the charger states of handheld multimedia devices, it may be necessary to corresponding operation is triggered, for example, when filling
When electric appliance is connected to charger interface, needs to carry out charger insertion and prompt and light screen.
In order to quickly detect charger states variation, a kind of current way is arrived in a charger end resistance in parallel
Ground, as shown in Figure 1, reaching increase discharge current, to accelerate the purpose of the detection to charger states.It is with charger voltage
5V, voltage detecting circuit detect that the voltage of charger interface just thinks charger lower than 4V or when voltage degradation reaches 1V
For being pulled out, if capacitor capacitance is 100uF, the resistance value of resistor is 50k ohm (corresponding to the electric current of 100uA), low
" system power consuming circuit " power consumption electric current is 10uA under power consumption mode, and charging circuit and voltage detecting circuit power consumption are nA grades, can
To be ignored, according to the electrical formula in basisCharger interface is detected to voltage detecting circuit from charger is extracted
Voltage degradation is a length of when reaching used in 1V
However, bringing the electric current of additional 100uA to disappear due to introducing the resistance that resistance value is 50k ohm at charger end
Consumption, that is, bring the power consumption of 10 times " system power consuming circuit ", the stand-by power consumption of equipment is about Q=i*t in unit time 1s
=(10uA+100uA) * 1s=110uAs.
If it is desired to shorten the detection duration of charger states variation, then need the resistance value of resistor smaller, corresponding volume
The electric current of outer consumption is then bigger, therefore power consumption is just bigger, and the purpose of low-power consumption standby may be not achieved.
Summary of the invention
The embodiment of the present application provides a kind of charger states detection circuit, circuitry and charger states detection side
Method.
In a first aspect, providing a kind of charger states detection circuit, comprising: current source circuit, electronic switch, electronic switch
Control circuit, voltage detecting circuit；
The input terminal of the current source circuit is connect by the electronic switch with equipment charger interface, the current source
The output end of circuit is grounded；
The input terminal of the electronic switch control circuit is connect with the output end of the voltage detecting circuit, the electronic cutting
The output end for closing control circuit is connect with the electronic switch, and the electronic switch control circuit is used for according to the voltage detecting
The output of circuit exports control signal to the electronic switch；
The voltage detecting circuit is used to detect the voltage of the equipment charger interface.
Optionally, the electronic switch control circuit, is specifically used for: judging according to the output of the voltage detecting circuit
After the equipment charger interface access charger, control signal is exported to the electronic switch according to the detection cycle of setting；
It wherein, include first time period and second time period, the electronic switch quilt in the first time period in a detection cycle
The first control signal of the electronic switch control circuit output is closed, and the electronic switch is described in the second time period
The second control signal of electronic switch control circuit output disconnects.
Optionally, the electronic switch control circuit, is specifically used for: judging according to the output of the voltage detecting circuit
After the equipment charger interface access charger, and after detection cycle unlatching, first control signal is exported, with control
The electronic switch is in closed state, and in the first duration that the electronic switch is in closed state, according to the electricity
Whether the output for pressing detection circuit, judge voltage degradation of the voltage of the equipment charger interface in first duration
More than or equal to first voltage threshold value；Wherein, first duration, which is less than, detects that charger is pulled out from the equipment charger interface
Required duration out；
If so, judging the equipment charger according to the output of the voltage detecting circuit after first duration
When the voltage degradation of interface is more than or equal to second voltage threshold value, determine that charger is extracted from the equipment charger interface, it is defeated
The second control signal out, with control the electronic switch be in an off state and keep the electronic switch be in disconnect shape
State, until judging that the equipment charger interface accesses charger according to the output of the voltage detecting circuit；Otherwise, institute is exported
Second control signal is stated, is in an off state with controlling the electronic switch, and into next after current detection end cycle
A detection cycle；Wherein, the second voltage threshold value is greater than the first voltage threshold value.
Optionally, the electronic switch control circuit, is also used to:
After detection cycle unlatching, electricity of the voltage of the equipment charger interface in first duration is judged
Reduction amount is pressed to be more than or equal to first voltage threshold value, but according to the voltage detecting not in the second duration after first duration
The output of circuit judges that the voltage degradation of the equipment charger interface is more than or equal to second voltage threshold value, then exports described the
Two control signals, are in an off state, and enter next inspection after current detection end cycle with controlling the electronic switch
Survey the period；Wherein, the sum of second duration and first duration, which are more than or equal to, detects charger from the equipment charge
Device interface extracts required duration, but less than the duration of a detection cycle.
Optionally, the current source circuit includes: current source or resistor.
Second aspect provides a kind of circuitry, which includes filling described in any one of above-mentioned first aspect
Electrical equipment state checks circuit, the equipment charger interface are also connected with system power consuming circuit and charging circuit.
The third aspect provides a kind of charger states detection method, is applied to include current source circuit, electronic switch, electricity
Sub switch control circuit, the charger states detection circuit of voltage detecting circuit, the input terminal of the current source circuit pass through institute
It states electronic switch to connect with equipment charger interface, the output end ground connection of the current source circuit, the electronic switch control electricity
The input terminal on road is connect with the output end of the voltage detecting circuit, the output end of the electronic switch control circuit and the electricity
Sub switch connection；
The described method includes:
The electronic switch control circuit judges the equipment charger interface according to the output of the voltage detecting circuit
Whether charger is accessed；
If so, the detection cycle according to setting exports control signal to the electronic switch；Wherein, a detection cycle
Interior includes first time period and second time period, and the electronic switch controls electricity by the electronic switch in the first time period
The first control signal of road output is closed, and the electronic switch is defeated by the electronic switch control circuit in the second time period
Second control signal out disconnects.
Optionally, the detection cycle according to setting exports control signal to the electronic switch, comprising:
After a detection cycle is opened, the electronic switch control circuit exports first control signal, described in control
Electronic switch is in closed state and in the first duration that the electronic switch is in closed state, according to the voltage detecting
The output of circuit, judges whether voltage degradation of the voltage of the equipment charger interface in first duration is greater than
In first voltage threshold value；Wherein, first duration, which is less than, detects charger needed for equipment charger interface extraction
Duration；
If so, judging that the equipment charger connects according to the output of the voltage detecting circuit after first duration
It when the voltage degradation of mouth is more than or equal to second voltage threshold value, determines that charger is extracted from the equipment charger interface, exports
The second control signal, with control the electronic switch be in an off state and keep the electronic switch be in disconnect shape
State, until judging that the equipment charger interface accesses charger according to the output of the voltage detecting circuit；Otherwise, institute is exported
Second control signal is stated, is in an off state with controlling the electronic switch, and into next after current detection end cycle
A detection cycle；Wherein, the second voltage threshold value is greater than the first voltage threshold value.
Optionally, the method also includes:
After detection cycle unlatching, electricity of the voltage of the equipment charger interface in first duration is judged
Reduction amount is pressed to be more than or equal to first voltage threshold value, but according to the voltage detecting not in the second duration after first duration
The output of circuit judges that the voltage degradation of the equipment charger interface is more than or equal to second voltage threshold value, then exports described the
Two control signals, are in an off state, and enter next inspection after current detection end cycle with controlling the electronic switch
Survey the period；Wherein, the sum of second duration and first duration, which are more than or equal to, detects charger from the equipment charge
Device interface extracts required duration, but less than the duration of a detection cycle.
Current source circuit and electronic switch and electronic switch control circuit are introduced in above-described embodiment of the application, electricity
The input terminal of current source circuit is connect by electronic switch with equipment charger interface, output end ground connection；Electronic switch control electricity
The input terminal on road and the output end of voltage detecting circuit connect, and output end is connect with electronic switch, so as to electronic switch control
Circuit exports control signal to electronic switch according to the output of voltage detecting circuit.Due to current source circuit by electronic switch with
The connection of equipment charger interface, and electronic switch is carried out closing or opening by the control of electronic switch control circuit, it in this way can be with
So that current source circuit is not to connect with equipment charge interface always, thus with phase is connect with equipment charger interface always
Than additional current drain can be reduced, and then reduces power consumption.On the other hand, it introduces current source circuit and is not introduced into current source
Circuit is compared, and the time span of equipment charge Interface status detection can be reduced.
Detailed description of the invention
Fig. 1 is the power supply interlock circuit schematic diagram of charger in the prior art；
Fig. 2A and Fig. 2 B is respectively charger states detection circuit schematic diagram provided by the embodiments of the present application；
Fig. 3 is charger states testing process schematic diagram provided by the embodiments of the present application.
Specific embodiment
The application introduces electronic switch and electronic switch control circuit in charger states detection circuit, with control
Current source circuit discharges to charger, persistently consumes charger current to avoid under low-power consumption mode, reaches reduction function
The purpose of consumption.
The embodiment of the present application is described in detail with reference to the accompanying drawing.
A referring to fig. 2 is charger states detection circuit 20 provided by the embodiments of the present application.Circuit structure shown in figure
For the logical construction of circuit, the component connection structure inside circuit is not shown.
As shown, the charger states detection circuit includes: current source circuit 21, electronic switch 22, electronic switch control
Circuit 23 processed, voltage detecting circuit 24.
The input terminal of current source circuit 21 is connect by electronic switch 22 with equipment charger interface 25, current source circuit 21
Output end ground connection.
The input terminal of electronic switch control circuit 23 is connect with the output end of voltage detecting circuit 24, electronic switch control electricity
The output end on road 23 is connect with electronic switch 22, electronic switch control circuit 23 be used for according to the output of voltage detecting circuit 24 to
The output control signal of electronic switch 22.
Voltage detecting circuit 24 is used for the voltage of detection device charger interface 25.
In above-mentioned charger states detection circuit 20, equipment charger interface 25 can also connect with system power consuming circuit 30
It connects, and is connect with charging circuit 40.The structure for the piece external circuit connecting with equipment charger interface 25 can be as shown in the figure.
In above-mentioned charger states detection circuit 20, optionally, current source circuit 21 can be current source, be also possible to
Resistor.
In above-mentioned charger states detection circuit 20, optionally, electronic switch 22 can be transistor or similar first device
Part, the transistor include field-effect tube.The field-effect tube can be PMOS field-effect tube, be also possible to NMOS field-effect
Pipe.
Charger states detection circuit 20 shown in Fig. 2A can be used as a composition portion in equipment internal integrated circuit
Point, the logic connecting relation of each circuit is illustrated only in figure.
In above-mentioned charger states detection circuit 20, electronic switch control circuit 23 can be according to the detection week of setting
Phase exports control signal to electronic switch 22, to control the on-off of electronic switch 22.
It optionally, as shown in Figure 2 B, can also include clock cycle circuit in above-mentioned charger states detection circuit 20
25, to generate clock signal, such as pulse signal, i.e. one detection week an of clock cycle length according to detection cycle length
Phase length.Electronic switch control circuit 23 is connect with clock cycle circuit 25, to obtain the clock of the generation of clock cycle circuit 25
Signal.
Specifically, electronic switch control circuit 23 can judge equipment charger according to the output of voltage detecting circuit 24
After interface 25 accesses charger, open detection process, in the detection process, according to the detection cycle of setting to electronic switch 22
Output control signal.Wherein, the length of detection cycle can experience flexible configuration according to human body.Such as can be set to 1s or
It is shorter, such as 500ms.The length of one detection cycle is required greater than detecting that charger is extracted from equipment charger interface 25
Duration, for example, in the case where needing 50ms just can detect that charger is extracted from equipment charger interface 25, a detection week
The length of phase may be configured as 500ms.It may include first time period and second time period in one detection cycle, in first time period
Interior, the first control signal that electronic switch 22 is exported by electronic switch control circuit 23 is closed；In second time period, electronic cutting
The second control signal that 22 are exported by electronic switch control circuit 23 is closed to disconnect.
Fig. 3 shows the process that above-mentioned charger states detection circuit 20 detects charger states.As shown, the process
Can include:
S301: after a detection cycle is opened, electronic switch control circuit 23 exports first control signal, electronic switch
22 are closed according to first control signal, so that current source circuit 21 is connect with equipment charger interface 25.Current source circuit 21 with
After equipment charger interface 25 connects, pull down the voltage of equipment charger interface.
S302: in the first duration that electronic switch 22 is in closed state, electronic switch control circuit 23 is according to voltage
The output of detection circuit 24, judges whether voltage degradation of the voltage of equipment charger interface 25 in the first duration is greater than
In first voltage threshold value, if so, being transferred to S303, it is otherwise transferred to S304.
Wherein, the first duration can be preset.First duration can be a shorter duration, less than detecting to charge
Device extracts required duration from equipment charger interface 25.For example, charger can be detected from equipment charge needing 50ms
In the case that device interface 25 is extracted, which may be configured as 5ms.
In the embodiment of the present application, first voltage threshold value and second voltage threshold value can be preset, first voltage threshold value is small
In second voltage threshold value.If electronic switch control circuit 23 in the first duration, is sentenced according to the output of voltage detecting circuit 24
The voltage degradation of disconnected equipment charger interface 25 is more than or equal to first voltage threshold value, it may be considered that there is charger to fill from equipment
The possibility that electrical apparatus interface 25 is extracted then continues to keep electronic switch 22 to be closed state, hereafter, if electronic switch control circuit
23 judge that the voltage degradation of equipment charger interface 25 is more than or equal to second voltage threshold according to the output of voltage detecting circuit 24
Value, it may be considered that there is charger to extract from equipment charger interface 25.
S303: in the case where keeping electronic switch closed state, electronic switch control circuit 23 is according to voltage detecting
The output of circuit 24 determines charging when judging that the voltage degradation of equipment charger interface 25 is more than or equal to second voltage threshold value
Device is extracted from equipment charger interface 25, second control signal is exported, so that electronic switch 22 is disconnected according to second control signal
Connection between current source circuit 21 and equipment charger interface 25, and the electronic switch is kept to be in an off state, until
Judge that equipment charger interface 25 accesses charger according to the output of the voltage detecting circuit.
In the step, after current source circuit 21 disconnects the connection between equipment charger interface 25, the current source circuit
21 are no longer consumed additional electric current, namely will not bring additional power consumption.
S304: electronic switch control circuit 23 exports second control signal, and under entering after current detection end cycle
One detection cycle.
In above-mentioned process, if detecting that voltage of the voltage of equipment charger interface 25 in the first duration subtracts in S302
It is more than or equal to first voltage threshold value in a small amount, then under normal conditions, this testing result is to connect due to charger from equipment charger
Caused by mouth 25 is extracted, therefore in S303, it can detect that the voltage of equipment charger interface 25 reduces in certain time length
Amount is more than or equal to second voltage threshold value.
In practical application, it is also possible to because other reasons lead to the electricity for detecting equipment charger interface 25 in S302
The voltage degradation being pressed in the first duration is more than or equal to first voltage threshold value, and equipment charger is not detected in S303 and connects
The voltage degradation of mouth 25 is more than or equal to second voltage threshold value (for example, charger is not pulled out from equipment charger interface 25 actually
Out, but due to city's electro-mechanical wave etc. cause to detect that voltage degradation is greater than first voltage threshold value in the first duration).For
Such case, in the embodiment of the present application, if electronic switch control circuit 23 is defeated according to voltage detecting circuit 24 in S303
Out, detect that the voltage degradation of equipment charger interface 25 is more than or equal to the second electricity in the second duration not after the first duration
Threshold value is pressed, then exports second control signal, is in an off state with controlling electronic switch 22, and the state is kept to examine until currently
Enter next detection cycle after surveying end cycle.Wherein, the sum of the first duration and the second duration are more than or equal to and detect to charge
Device extracts required duration from the equipment charger interface, but less than the length of a detection cycle.Optionally, described second
Duration, which can be set to be equal to or slightly greater than, detects that charger extracts required duration from the equipment charger interface, such as
In above-mentioned example, 60ms can be set by the second duration.
Current source circuit and electronic switch and electronic switch control circuit are introduced in above-described embodiment of the application.Electricity
The input terminal of sub switch control circuit and the output end of voltage detecting circuit connect, and output end is connect with electronic switch, so as to
Electronic switch control circuit exports control signal to electronic switch according to the output of voltage detecting circuit.Since current source circuit is logical
Electronic switch is crossed to connect with equipment charge interface, and electronic switch is closed or is broken by the control of electronic switch control circuit
It opens, can make current source circuit in this way is not to connect with equipment charge interface always, thus with connecing with equipment charge always
Mouth connection is compared, and can reduce additional current drain, and then reduce power consumption.On the other hand, it introduces current source circuit and does not draw
Enter current source circuit to compare, the time span of equipment charge Interface status detection can be reduced.
It is related by choosing suitable component parameter and/or detection cycle based on above-mentioned charger states detection circuit
Whether parameter may be implemented to be extracted with shorter duration detection charger, and equipment power dissipation can be made lower, really realize
Charger keeps low-power consumption working condition in the case where charging.
The embodiment of the present application is described with a specific example below.
In this example embodiment, charger voltage 5V, the capacitor capacitance in piece external circuit are 100uF, current source circuit 21
The resistor electric current of 2mA (correspondence) for resistance value equal to 2.5K ohm, detection cycle 500ms, first when a length of 5ms, first
Voltage threshold is 0.2V, and second voltage threshold value is 1V.When low-power consumption standby mode, the power consumption of the system power consuming circuit 30 of equipment is
10uA。
At the t0 moment, voltage detecting circuit 24 detects that the voltage of equipment charger interface 25 is greater than 4.75V, then it is assumed that has
Charger is inserted into equipment charger interface 25.Output of the electronic switch control circuit 23 according to voltage detecting circuit 24, output height
Level, electronic switch 22 is switched on, and (in this example, electronic switch 22 is in the conductive state under high level, under low level
In off state) so that resistor 21 is connect with equipment charger interface 25.
Hereafter in 5ms (i.e. in the first duration), electronic switch control circuit 23 keeps output high level, electronic switch 22
It tends to remain on.During this period, electronic switch control circuit 23 judges that equipment is filled according to the output of voltage detecting circuit 24
Whether the voltage degradation of electrical apparatus interface 25 is more than or equal to 0.2V (i.e. first voltage threshold value).In this example, charger is not from setting
It is extracted in standby charger interface 25, therefore electronic switch control circuit 23 does not detect equipment charger interface during this period of time
25 voltage degradation is greater than or equal to 0.2V.
After undergoing 5ms (i.e. the first duration), electronic switch control circuit 23 exports low level and keeps 455ms,
In the 455ms, electronic switch 22 is turned off, so that resistor 21 is disconnected with 25 port of equipment charger interface.
After above-mentioned 455ms, next detection cycle is opened, in new detection cycle, electronic switch control circuit 23
Output high level simultaneously keeps 5ms.In the 5ms, electronic switch 22 is switched on, so that resistor 21 and equipment charger interface 25
Connection, and electronic switch control circuit 23 judges the electricity of equipment charger interface 25 according to the output of voltage detecting circuit 24
Pressing reduction amount to be greater than 0.2V, (in the 455ms of upper a cycle or in the preceding 5ms in this period, charger is from equipment charger
Interface is extracted), then electronic switch control circuit 23 continues to keep output high level, until according to the defeated of voltage detecting circuit 24
Out, when judging that the voltage degradation of equipment charger interface 25 is greater than 1V, confirmation charger is extracted, and exports low level at this time, with
Turn off electronic switch 22, so that the connection between resistor 21 and equipment charger interface 25 disconnects.
In this example, according to the electrical formula in basisIt is filled from extracting charger and being detected to voltage detecting circuit
Electrical interface voltage degradation reaches duration used in 1V about are as follows:
In 1s of the equipment charger interface 25 inserted with charger, under low-power consumption mode, equipment power dissipation is about are as follows:
Q=[10uA*500ms+2mA*5ms] * 2=30uAs
As can be seen that compared with prior art, detection speed can be improved using the embodiment of the present application, and can reduce and set
Standby power consumption.
The embodiment of the present application also provides a kind of circuitry, which can as shown in fig. 2 a or 2b, wherein can wrap
It includes: charger states detection circuit 20 and system power consuming circuit 30, charging circuit 40, system power consuming circuit 30, charging circuit
40 connect with equipment charger interface 25.
It should be understood by those skilled in the art that, the embodiment of the present application can provide as the production of method, system or computer program
Product.Therefore, in terms of the embodiment of the present application can be used complete hardware embodiment, complete software embodiment or combine software and hardware
Embodiment form.Moreover, it wherein includes computer available programs generation that the embodiment of the present application, which can be used in one or more,
The meter implemented in the computer-usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) of code
The form of calculation machine program product.
The embodiment of the present application is referring to the method, equipment (system) and computer program product according to the embodiment of the present application
Flowchart and/or the block diagram describe.It should be understood that can be realized by computer program instructions in flowchart and/or the block diagram
The combination of process and/or box in each flow and/or block and flowchart and/or the block diagram.It can provide these calculating
Processing of the machine program instruction to general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices
Device is to generate a machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute
For realizing the function of being specified in one or more flows of the flowchart and/or one or more blocks of the block diagram
Device.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Claims (9)
1. a kind of charger states detection circuit characterized by comprising current source circuit, electronic switch, electronic switch control
Circuit, voltage detecting circuit；
The input terminal of the current source circuit is connect by the electronic switch with equipment charger interface, the current source circuit
Output end ground connection；
The input terminal of the electronic switch control circuit is connect with the output end of the voltage detecting circuit, the electronic switch control
The output end of circuit processed is connect with the electronic switch, and the electronic switch control circuit is used for according to the voltage detecting circuit
Output to the electronic switch export control signal；
The voltage detecting circuit is used to detect the voltage of the equipment charger interface.
2. charger states detection circuit as described in claim 1, which is characterized in that the electronic switch control circuit, tool
Body is used for:
After judging the equipment charger interface access charger according to the output of the voltage detecting circuit, according to setting
Detection cycle exports control signal to the electronic switch；Wherein, when in a detection cycle including first time period and second
Between section, the electronic switch is closed by the first control signal that the electronic switch control circuit exports in the first time period
It closes, the second control signal that the electronic switch is exported by the electronic switch control circuit in the second time period disconnects.
3. charger states detection circuit as claimed in claim 2, which is characterized in that the electronic switch control circuit, tool
Body is used for:
After judging the equipment charger interface access charger according to the output of the voltage detecting circuit, an inspection is opened
It surveys the period, and after detection cycle unlatching, exports first control signal, be in closed form to control the electronic switch
State, and in the first duration that the electronic switch is in closed state, according to the output of the voltage detecting circuit, judge institute
State whether voltage degradation of the voltage of equipment charger interface in first duration is more than or equal to first voltage threshold value；Its
In, first duration, which is less than, detects that charger extracts required duration from the equipment charger interface；
If so, judging the equipment charger interface according to the output of the voltage detecting circuit after first duration
When voltage degradation is more than or equal to second voltage threshold value, determine that charger is extracted from the equipment charger interface, described in output
Second control signal is in an off state with controlling the electronic switch, and the electronic switch is kept to be in an off state, directly
Judge that the equipment charger interface accesses charger to according to the output of the voltage detecting circuit；Otherwise, described the is exported
Two control signals, are in an off state, and enter next inspection after current detection end cycle with controlling the electronic switch
Survey the period；Wherein, the second voltage threshold value is greater than the first voltage threshold value.
4. charger states detection circuit as described in claim 1, which is characterized in that the electronic switch control circuit, also
For:
After detection cycle unlatching, judge that voltage of the voltage of the equipment charger interface in first duration subtracts
It is more than or equal to first voltage threshold value in a small amount, but according to the voltage detecting circuit not in the second duration after first duration
Output judge the equipment charger interface voltage degradation be more than or equal to second voltage threshold value, then export it is described second control
Signal processed is in an off state with controlling the electronic switch, and enters next detection week after current detection end cycle
Phase；Wherein, the sum of second duration and first duration, which are more than or equal to, detects that charger connects from the equipment charger
Mouth extracts required duration, but less than the duration of a detection cycle.
5. charger states detection circuit as described in claim 1, which is characterized in that the current source circuit includes: electric current
Source or resistor.
6. a kind of circuitry, which is characterized in that including the charger states detection as described in any one of claims 1 to 5
Circuit, the equipment charger interface are also connected with system power consuming circuit and/or charging circuit.
7. a kind of charger states detection method, which is characterized in that be applied to include current source circuit, electronic switch, electronic cutting
Control circuit, the charger states detection circuit of voltage detecting circuit are closed, the input terminal of the current source circuit passes through the electricity
Sub switch is connect with equipment charger interface, the output end ground connection of the current source circuit, the electronic switch control circuit
Input terminal is connect with the output end of the voltage detecting circuit, the output end of the electronic switch control circuit and the electronic cutting
Connection connects；
The described method includes:
Whether the electronic switch control circuit judges the equipment charger interface according to the output of the voltage detecting circuit
Access charger；
If so, the detection cycle according to setting exports control signal to the electronic switch；Wherein, packet in a detection cycle
First time period and second time period are included, the electronic switch is defeated by the electronic switch control circuit in the first time period
First control signal out is closed, and the electronic switch is exported by the electronic switch control circuit in the second time period
Second control signal disconnects.
8. the method for claim 7, which is characterized in that the detection cycle according to setting is defeated to the electronic switch
Signal is controlled out, comprising:
After judging the equipment charger interface access charger according to the output of the voltage detecting circuit, an inspection is opened
It surveys the period, and after detection cycle unlatching, the electronic switch control circuit exports first control signal, described in control
Electronic switch is in closed state, and in the first duration that the electronic switch is in closed state, is examined according to the voltage
The output of slowdown monitoring circuit, judges whether voltage degradation of the voltage of the equipment charger interface in first duration is greater than
Equal to first voltage threshold value；Wherein, first duration, which is less than, detects that charger extracts institute from the equipment charger interface
The duration needed；
If so, judging the equipment charger interface according to the output of the voltage detecting circuit after first duration
When voltage degradation is more than or equal to second voltage threshold value, determine that charger is extracted from the equipment charger interface, described in output
Second control signal is in an off state with controlling the electronic switch, and the electronic switch is kept to be in an off state, directly
Judge that the equipment charger interface accesses charger to according to the output of the voltage detecting circuit；Otherwise, described the is exported
Two control signals, are in an off state, and enter next inspection after current detection end cycle with controlling the electronic switch
Survey the period；Wherein, the second voltage threshold value is greater than the first voltage threshold value.
9. method according to claim 8, which is characterized in that the method also includes:
After detection cycle unlatching, judge that voltage of the voltage of the equipment charger interface in first duration subtracts
It is more than or equal to first voltage threshold value in a small amount, but according to the voltage detecting circuit not in the second duration after first duration
Output judge the equipment charger interface voltage degradation be more than or equal to second voltage threshold value, then export it is described second control
Signal processed is in an off state with controlling the electronic switch, and enters next detection week after current detection end cycle
Phase；Wherein, the sum of second duration and first duration, which are more than or equal to, detects that charger connects from the equipment charger
Mouth extracts required duration, but less than the duration of a detection cycle.
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