CN110426549A - The current detection circuit and electronic equipment of power channel - Google Patents
The current detection circuit and electronic equipment of power channel Download PDFInfo
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- CN110426549A CN110426549A CN201910746998.2A CN201910746998A CN110426549A CN 110426549 A CN110426549 A CN 110426549A CN 201910746998 A CN201910746998 A CN 201910746998A CN 110426549 A CN110426549 A CN 110426549A
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- 238000001514 detection method Methods 0.000 title claims abstract description 84
- 230000005669 field effect Effects 0.000 claims abstract description 140
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- 230000005611 electricity Effects 0.000 claims description 7
- 238000007689 inspection Methods 0.000 abstract description 27
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- 238000005516 engineering process Methods 0.000 description 7
- 238000005259 measurement Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
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- 238000012512 characterization method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
Abstract
The present invention provides a kind of current detection circuit of power channel and electronic equipment, the current detection circuit includes: parallel branch, current detection module and control module；The parallel branch is parallel to the both ends of first field-effect tube；The control module connects the grid of first field-effect tube, in the running current information that need to determine the power channel, controlling the first field-effect tube shutdown；The parallel branch can be held on when that need to determine the running current information；The current detection module connects the parallel branch, for detecting the current information of the parallel branch, so that the running current information can the current information of the parallel branch be determined according to first field-effect tube shutdown and when the parallel branch is connected.The present invention can be avoided while realizing effectively detection and connect inspection leakage resistance in power channel to reduce the power consumption and heat of power channel.
Description
Technical field
The present invention relates to chargeable electronic equipments more particularly to a kind of current detection circuit of charging circuit to set with electronics
It is standby.
Background technique
It in the electronic device, can be load supplying by power channel, wherein using circuit devcie to power channel
Current path is managed, such as in mobile phone, can be realized by circuit device therewith and directly be filled path management.
In order to be suitable for management, the current information of power channel need to be detected.In turn, in order to detect power channel
Current information, an inspection leakage resistance need to be usually set in power channel, and the inspection leakage resistance and load in series in turn can be first
The current information that the inspection leakage resistance is sampled using current sense amplifier obtains the voltage signal for characterizing the current information,
And the voltage signal is amplified, then by analog-digital converter to amplified signal carry out analog-to-digital conversion, enable by
Logic control module is got.
In this process, due to load need to inspection leakage resistance connect, the impedance that will lead to power channel is larger, be easy to because
Inspection leakage resistance causes power loss, can also distribute because of the heat that the power consumption of inspection leakage resistance increases power channel.
Summary of the invention
The present invention provides the current detection circuit and electronic equipment of a kind of power channel, to solve to detect using inspection leakage resistance
The problem that when power channel.
According to the first aspect of the invention, a kind of current detection circuit of power channel, the power channel packet are provided
Sequentially connected power input, the first field-effect tube and load are included, the current detection circuit includes: parallel branch, electric current
Detection module and control module；The parallel branch is parallel to the both ends of first field-effect tube；
The control module connects the grid of first field-effect tube, for that need to determine the normal of the power channel
When operating current information, the first field-effect tube shutdown is controlled；
The parallel branch can be held on when that need to determine the running current information；
The current detection module connects the parallel branch, for detecting the current information of the parallel branch, so that
Obtaining the running current information can be according to when first field-effect tube turns off and the parallel branch is connected simultaneously
The current information of connection branch is determined.
Optionally, the second field-effect tube is equipped in the parallel branch, second field-effect tube can need to determine institute
It is held on when stating running current information.
Optionally, the current detection module includes the image field with the size of second field-effect tube in proportionate relationship
Effect pipe and analog-digital converter, the mirror image field-effect tube are connected with the resistance configured, and being not connected with for the resistance is described
One end of mirror image field-effect tube is grounded, and the analog-digital converter can acquire the pressure of the resistance for characterizing current information
Drop.
Optionally, impedance caused by first field-effect tube is less than impedance caused by the parallel branch.
Optionally, the control module includes charge pump control unit, an output end of the charge pump control unit
The grid of first field-effect tube is connected, to control institute in the running current information that need to determine the power channel
State the shutdown of the first field-effect tube.
Optionally, the current detection module is also connected with data processing module, and the data processing module is for obtaining institute
The current information of the parallel branch when shutdown of the first field-effect tube and parallel branch conducting is stated, and according to the current information
Determine the running current information.
Optionally, the control module is also connected with the grid of third field-effect tube, and the third field-effect tube is set to described
Power channel, and be set between first field-effect tube and the load.
Optionally, the control module is also connected with the parallel branch, is used for:
The parallel branch is controlled to be held in normal work with when need to determine the running current information.
Optionally, the control module is also connected with the parallel branch, is used for:
The voltage of the power input occur over-voltage and it is under-voltage when control parallel branch shutdown.
Optionally, the control module is also used to: in normal work, controlling the first field-effect tube conducting.
According to the second aspect of the invention, a kind of electronic equipment is provided, including first aspect and its optinal plan are related to
Current detection circuit and power channel.
In the current detection circuit and electronic equipment of power channel provided by the invention, leakage resistance will be examined by, which avoiding, is series at electricity
Source channels, and the parallel branch in parallel with the first field-effect tube is used, when running current information need to be detected, the present invention
The first field-effect tube shutdown can be controlled by control module, and the parallel branch is able to maintain conducting, electric current is through parallel connection
Branch enters load, and (the first field-effect tube and parallel branch are equal when the current information of parallel branch can be with normal work at this time
When conducting) running current information it is associated, in turn, when running current information can individually be connected according to parallel branch
Current information determined, for example, the first field-effect tube and parallel branch impedance it is sufficiently small when, can ignore not relative to load
Meter, at this point, current information when measured parallel branch is individually connected can be used as running current information.
The present invention is based on parallel branch, current detection module and control module, realize to the effective of power channel electric current
Detection can be avoided while realizing effectively detection and connect inspection leakage resistance in power channel to reduce the function of power channel
Consumption and heat.
Simultaneously as the impedance of parallel branch can be not required to very little, the on the one hand measurement of the readily available higher electric current of energy
Precision, the type selecting range of device will not be too small and limited because of inspection leakage resistance in another aspect current detection module, and then may be adapted to
Use more inexpensive device, it is seen then that the present invention can be also convenient for combining detection accuracy and cost.
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
Some embodiments of invention without any creative labor, may be used also for those of ordinary skill in the art
To obtain other drawings based on these drawings.
Fig. 1 is the organigram one of power channel and current detection circuit in one embodiment of the invention；
Fig. 2 is the organigram two of power channel and current detection circuit in one embodiment of the invention；
Fig. 3 is the organigram three of power channel and current detection circuit in one embodiment of the invention；
Fig. 4 is the organigram four of power channel and current detection circuit in one embodiment of the invention；
Fig. 5 is the circuit diagram of power channel and current detection circuit in one embodiment of the invention.
Description of symbols:
1- current detection circuit；
11- control module；
111- charge pump control unit；
12- parallel branch；
121、N2- the second field-effect tube；
13- current detection module；
2- power channel；
21、N1- the first field-effect tube；
22, VIN- power input；
23、RloadLoad；
24、N3Third field-effect tube；
CSA- current sense amplifier；
ADC- analog-digital converter.
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.
Description and claims of this specification and term " first ", " second ", " third " " in above-mentioned attached drawing
The (if present)s such as four " are to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should manage
The data that solution uses in this way are interchangeable under appropriate circumstances, so as to the embodiment of the present invention described herein can in addition to
Here the sequence other than those of diagram or description is implemented.In addition, term " includes " and " having " and their any deformation,
Be intended to cover it is non-exclusive include, for example, containing the process, method of a series of steps or units, system, product or setting
It is standby those of to be not necessarily limited to be clearly listed step or unit, but may include be not clearly listed or for these mistakes
The intrinsic other step or units of journey, method, product or equipment.
Technical solution of the present invention is described in detail with specifically embodiment below.These specific implementations below
Example can be combined with each other, and the same or similar concept or process may be repeated no more in some embodiments.
Fig. 1 is the organigram one of power channel and current detection circuit in one embodiment of the invention.
Referring to FIG. 1, providing a kind of current detection circuit of power channel, the power channel 2 includes being sequentially connected
Power input 22, the first field-effect tube 21 and load 23.
Power channel 2, it will be appreciated that powering for power input 22 can be supplied to the circuit structure of load 23 to be any,
In may be configured with the first field-effect tube 21, with control power input 22 and load 23 between on-off.Meanwhile the present embodiment is not
The scheme that power channel 2 is additionally provided at least one other switch, resistance etc. device is excluded, switch therein can such as another effect
Ying Guan.
In actual use, under the scene of part, it may be necessary to be detected to the electric current of power channel 2, below with hand
Machine is described this scene as the citing of electronic equipment:
In directly filling in path management for mobile phone, current path generally requires to be controlled turn-on and turn-off processed, or even needs support
Two-way shutdown and specified one-way conduction function, execute the function device can for example above first field-effect tube 21 and/or
Related third field-effect tube 24 hereinafter, meanwhile, power channel 2 can refer to current path referred to above, in turn, in portion
In the scape of branch, management (such as controlling the on-off of the first field-effect tube 21) optimization power supply, charging to power channel 2 can be passed through
Speed and heat condition.So adjusting charging rate in order to manage charging or power supply safety and understanding charge transport
Situation etc. need to detect the electric current of power channel 2.
In view of this, it is existing in the related technology, be to the control of field-effect tube in power channel 2 and the detection of current information
It is realized respectively by different components.
The quantity of power channel 2 can be one in electronic equipment, while the quantity for being also not excluded for power channel 2 more than one
A embodiment.It is corresponding, the same current detection circuit can be used and detected, different current detection circuits can also be used
It is detected.
First field-effect tube 21 can be arbitrary field-effect tube.
Load 23, it will be appreciated that need to be arbitrarily provided the device of electric energy or the set of device in electronic equipment, be embodied
In the process, load 23 can be for example including electricity consumption device blocks and/or energy-storage module.Separate first field-effect tube 21 of load 23
One end can directly or indirectly be grounded.
Power input 22, it will be appreciated that for the circuit node that arbitrarily can be load supplying, front end can connect electronics and set
Standby external power supply interface, can also connect energy storage device, and can also connect any other can provide the device of electric energy or be set for it
It is standby.
In the present embodiment, the current detection circuit 1 includes: parallel branch 12, current detection module 13 and control module
11, the parallel branch 12 is parallel to the both ends of first field-effect tube 21.
As it can be seen that above embodiments can be avoided connect inspection leakage resistance in power channel to reduce the power consumption of power channel with
Heat.
Specifically, if with RN1Characterize the impedance of the first field-effect tube generation, RsenseThe impedance of characterization inspection leakage resistance, RloadTable
Levy the impedance of load, then: partially in the prior art, in the case where not considering other field-effect tube, device, power channel
Impedance can be characterized as being: RN1+Rsense+Rload, corresponding, the impedance in the present embodiment optional embodiment can be because of nothing
RsenseAnd reduce, to be characterized as being: RN1+Rload。
In the present embodiment, the control module 11 can connect the grid of first field-effect tube 21, for needing to determine
When the running current information of the power channel, controls first field-effect tube 21 and turn off.
Meanwhile parallel branch 12 can be held on when that need to determine the running current information, it specifically can be such as: control
Molding block 11 can also connect parallel branch 12, need to determine the running current information for controlling the parallel branch 12
When be held on.In specific implementation process, parallel branch 12 can be also held in normal work, meanwhile, the present embodiment
It is not excluded for the situation not being held in normal work.
The current detection module 13 connects the parallel branch 12, and the electric current for detecting the parallel branch 12 is believed
Breath, so that the running current information can be turned off according to first field-effect tube 21 and the parallel branch 12 is led
The current information of the parallel branch 12 is determined when logical.
When that need to detect running current information, embodiment of above can control first effect by control module
Should pipe shutdown, and the parallel branch is able to maintain conducting, and electric current enters load through parallel branch, at this time the electric current of parallel branch
Information can be associated with running current information when working normally (when the first field-effect tube is both turned on parallel branch),
In turn, current information when running current information can individually be connected according to parallel branch is determined.
The present embodiment is based on parallel branch, current detection module and control module, and realizing has power channel electric current
Effect detection, and while realizing effectively detection, it can be because avoiding reducing power channel due to power channel connects inspection leakage resistance
Power consumption and heat.
As it can be seen that detecting current information using time-sharing format in embodiment of above, it may be assumed that circuit state when detection can be with
It is different when from non-detection.Wherein, for electronic equipment under the application scenarios for charging or powering, current variation speeds are often all very slow,
In turn, the mode of timesharing measurement will not impact in itself charging or power supply.
Simultaneously as being that timesharing measures, the impedance of parallel branch can be not required to very little, in turn, convenient for taking into account detection essence
Degree and cost.
In contrast, it is existing in the related technology, the concatenated inspection leakage resistance of institute is directed to, in order to mitigate power loss and heat
The problem of distributing, it will usually select the inspection leakage resistance that resistance value is minimum, such as can be as small as 1 to 2 milliohm, to simplify the heat dissipation of system
Design or the through-current capability for improving system promote power supply capacity or charging rate.
However, for the inspection leakage resistance for cooperating such minimum, current sense amplifier, analog-digital converter etc. need to just select with
Matched model, and such current sense amplifier and analog-digital converter also can relative accuracy it is higher, cost may also can be compared with
Height, can be regarded as inspection leakage resistance it is smaller, the cost of matched current sense amplifier, analog-digital converter is also higher.
Meanwhile inspection leakage resistance is smaller, the influence of the offset voltage and input bias current of amplifier is just relatively bigger, will lead to electric current
Measurement accuracy is difficult to ensure.
According to the description of the present embodiment embodiment of above as it can be seen that in the present embodiment the impedance of parallel branch can be not required to very
It is small, it may be assumed that impedance can accomplish it is bigger more flexible, since the impedance of parallel branch can be not required to very little, on the one hand can it is readily available more
The measurement accuracy of high electric current, in another aspect current detection module the type selecting range of device will not because examine leakage resistance it is too small due to by
Limit, and then may be adapted to using more inexpensive device, it is seen then that embodiment of above can convenient for combine detection accuracy at
This.
It is, for example, less than certain threshold value when the first field-effect tube and parallel branch impedance are sufficiently small in one of embodiment,
Its impedance can ignore relative to load, at this point, current information when measured parallel branch is individually connected can be used as
Running current information.
The present embodiment is also not excluded for not ignoring the embodiment of the first field-effect tube Yu parallel branch impedance, due to first
The impedance of the devices such as effect pipe, parallel branch, load be it is known, the voltage of power input 22 is also known, and can also be led to
Amount when oversampling circuit principle calculates the current information of parallel branch when being individually connected and is both turned between running current information
Change relationship, to calculate running current information according to the quantitative relationship.
In specific implementation process, inner the first field-effect is all controlled in the most of the time (such as 99.9% or more time)
Pipe 21 is held on to realize normal power supply, it may be assumed that electric current, can be via the first field-effect tube 21 after the inflow of power input 22
The parallel port generated after in parallel with parallel branch 12 directly or indirectly flows into load 23, finally passes back into ground.
It is inner in fraction of time (being, for example, less than 0.1% time), it can be regarded as needing to learn that running current is believed
In the time of breath, at this time by power input 22 flow through parallel port referred to above enter back into load 23 electric current when,
Control module 11 can first ensure that parallel branch remains on state, be then powered off the first field-effect tube 21, that is, have turned off original
The power channel 2 come, the electric current of power input 22 to load 23 all flows through parallel branch 12 at this time, using current detecting
Module 13 measures the electric current for flowing through parallel branch 12, and obtained electric current is to flow through the first field-effect tube when working normally
21 and parallel branch 12 parallel port electric current.
Normal work referred to above, it will be appreciated that be connected for power channel 2, be with the power supply using power input 22
A kind of circuit state of 23 power supply of load.
In one of embodiment, the lesser field-effect tube of conducting resistance is can be selected in the first field-effect tube 21, such as can
The impedance generated less than parallel branch 12, it may be assumed that impedance caused by first field-effect tube 21 is less than the parallel branch 12
Generated impedance.In turn, in parallel with parallel branch 12 in the first field-effect tube 21 and when being both turned on, that is, when working normally, electricity
Stream can flow primarily through the first field-effect tube 21.
Fig. 2 is the organigram two of power channel and current detection circuit in one embodiment of the invention.
Parallel branch 12, it will be appreciated that can arbitrarily to generate impedance, be suitable for by current acquisition, and be parallel to first effect
Should pipe 21 branch, wherein can have the combination of the device or device of any achievable above functions.
In one of embodiment, referring to FIG. 2, the second field-effect tube 121 is equipped in the parallel branch 12, it is described
Second field-effect tube 121 is able to maintain conducting, in specific implementation process, can be held under the control of control module 11, example
Such as: the control module 11 connects the grid of second field-effect tube 121, is specifically used for controlling second field-effect tube
121 are held on when that need to determine the running current information.Wherein, the second field-effect tube 121 of control conducting, that is, control
Parallel branch 12 is connected.
In further specific implementation process, also controllable second field-effect tube 121 of the control module 11 is being worked normally
When be also held on.
By the second field-effect tube 121, certain impedance can be provided, it also can be by control on-off, so that in parallel
Branch 12 is able to achieve function referred to above.
In other embodiments, it is possible to use an inspection leakage resistance substitutes the second field-effect tube 121.
Fig. 3 is the organigram three of power channel and current detection circuit in one embodiment of the invention.
Referring to FIG. 3, the control module 11 includes charge pump control unit 111, described in one of embodiment
One output end of charge pump control unit 111 connects the grid of first field-effect tube 21, need to determine the power supply
When the running current information in channel 2, controls first field-effect tube 21 and turn off, this of charge pump control unit 111 is defeated
Outlet can be the first output end.
In specific implementation process, another second output terminal of the charge pump control unit 111 can connect the branch in parallel
Road 12 is held on controlling the parallel branch 12, specifically can in normal work with need to determine the normal of power channel
It is held on when operating current information.
If charge pump control unit 111 need to externally use two output ends, in a kind of citing, charge pump control unit 111
It can be with two output ends, and the charge pump control unit of two exportable unlike signals of output end；Another kind citing, electricity
Lotus pump control unit 111 can have there are two charge pump, be utilized respectively an output end output signal.
Above is referred to charge pump control unit be also characterized by: Charge Pump Ctrl, Ctrl therein can be managed
Solution is Controller.Its conventional effect also is understood as: in the chip portion for respectively drive and (manage) conducting and
Turn off the circuit unit of field-effect tube involved by the present embodiment.But, the present embodiment further can also can be to chip outside
Field-effect tube carry out on-off control, can refer to following associated description and understand.
In one of embodiment, the current detection module is also connected with data processing module, the data processing mould
Block is used to obtain the current information of parallel branch when the first field-effect tube shutdown and parallel branch conducting, and root
The running current information is determined according to the current information.Such as it can determine described in the current information conduct of parallel branch at this time
Running current information.
In one of embodiment, data processing module can be existing module in electronic equipment, be also possible to another
The module of configuration.
Fig. 4 is the organigram four of power channel and current detection circuit in one embodiment of the invention.
Referring to FIG. 4, the control module 11 is also connected with the grid of third field-effect tube 24 in one of embodiment
Pole, the third field-effect tube 24 are set to the power channel 2, and be set to first field-effect tube 21 and the load 23 it
Between.
Wherein, the on-off of third field-effect tube 24 can be consistent with the on-off of parallel branch 12, in turn, be embodied
Cheng Zhong, third field-effect tube 24 and parallel branch 12 may connect to the same output end of charge pump control unit 111.Meanwhile this
Embodiment is also not excluded for being separately connected the scheme of third field-effect tube 24 Yu parallel branch 12 using different output ends.
In one of embodiment, please refer to figs. 1 to 4, and as mentioned before, the control module 11 is also connected with
The parallel branch 12, is used for:
The parallel branch 12 is controlled to be held in normal work with when need to determine the running current information.
In specific implementation process, the control module 11 can also be used in:
The voltage of the power input 22 occur over-voltage and it is under-voltage when control the parallel branch 12 and turn off.So as to
It is enough to play a protective role to circuit.
Current detection module 13 referred to above, it can be understood as be arbitrarily able to detect the device of 12 electric current of parallel branch
Or the combination of device, the both ends of parallel branch can be parallel to.Current detection module 13 is specifically characterized by: Current
Measure。
In a kind of citing, current detection module 13 may include current sense amplifier CSA and analog-digital converter ADC, should
Current sense amplifier CSA can be parallel to parallel branch, and connect analog-digital converter ADC.
In another kind citing, current detection module 13 can support the mode of image current, so as to promote principal current
The accuracy and consistency of measurement.
Wherein, if being equipped with the second field-effect tube 121 in parallel branch 12: current detection module 13 may include and second
The size of field-effect tube 121 is in the mirror image field-effect tube ADC and analog-digital converter of proportionate relationship, wherein the second field-effect tube
121 can obtain required image current, the mirror image field-effect tube in the proportionate relationship of high precision with mirror image field-effect tube
It connects with the resistance configured, one end for being not connected with the mirror image field-effect tube of the resistance can be grounded, and the modulus turns
Parallel operation ADC can acquire the pressure drop of the resistance for characterizing current information, such as: the ohmically pressure drop can be direct
Connect the input of analog-digital converter.
In turn, the electric current obtained by mirror image field-effect tube mirror image can be with the electric current of the second field-effect tube 121 at accurate
Proportionate relationship, analog-digital converter can collect the current information of the second field-effect tube 121, in turn.
Analog-digital converter involved in the above citing can be connected to data processing module or other use referred to above
In the combination for the device or device for obtaining current information, thus can determine the current information of the second field-effect tube 121,
In, it may be determined that the current information of the second field-effect tube 121 is running current information when the first field-effect tube 21 turns off.
It is used for after having used image current and its corresponding configurable resistance based on scheme referred to above
Inspection is flowed and the inspection leakage resistance in the impedance compared with the prior art of the parallel circuit and current detection module of generation can amplify such as
1000 times, the prior art passes through current sense amplifier CSA fixed to the pressure drop amplification on former inspection leakage resistance multiple (such as 50
Analog-digital converter ADC being entered back into again) to measure, the present embodiment, which can control, selects different resistance to measure, such as
Amplify 1000 × 50 times of inspection leakage resistance with resistance compared with the prior art when electric current very little to be measured, when electric current to be measured is larger, after
The continuous resistance for amplifying 1000 times.
In one of embodiment, please refer to figs. 1 to 4, and as mentioned before, the control module 11 also can be used
In: in normal work, controls first field-effect tube 21 and be connected.
In specific implementation process, parallel branch 12 referred to above, current detection module 13 and control module 11 can collect
At in same chip.The chip can be regarded as control chip, specifically may be characterized as: App Specific Ctrl, Ctrl therein
It can be regarded as Controller.
Data processing module referred to above can be set to same chip, can not also be set to same chip.
If parallel branch 12, current detection module 13 and control module 11 are integrated in same chip, in control module 11
Charge pump control unit 111 can also draw control pin other than portion's control 121 on-off of the second field-effect tube in the chip
Control the on-off of external field-effect tube (such as the first field-effect tube 21 and third field-effect tube 24), it may be assumed that in the control module
Charge pump control unit connects first field-effect tube and/or third field-effect tube, phase by the pin of the control chip
Compared with for, it is existing in the related technology using charge pump output control when, usually to chip interior device output, so, with
Upper embodiment can further enrich the diversity of charge pump control unit output function, be no longer limited in chip.
In addition, it is existing in the related technology, lesser inspection leakage resistance will also result in during the welding process it is biggish it is opposite accidentally
Difference, or even also will affect the consistency of the current detecting result of bulk article.In contrast, using the side of above each embodiment
When case, because may not need the lesser inspection leakage resistance of welding, also the consistent of testing result can be improved further convenient for reducing error
Property.
Fig. 5 is the circuit diagram of power channel and current detection circuit in one embodiment of the invention.
Referring to FIG. 5, and combine Fig. 1 to Fig. 4, involved in the first field-effect tube 21, the second field-effect tube 121 with
Third field-effect tube 24 all can be N-type field-effect tube.So the first field-effect tube 21 can pass through N1It characterizes, therein
Two field-effect tube 121 can pass through N2It characterizes, third field-effect tube 24 can pass through N3It characterizes, load 23 can pass through RloadCarry out table
Sign, power input 22 can be VIN.
In turn, also using RN1To characterize the impedance of the first field-effect tube 21, RN2Characterize the resistance of the second field-effect tube 121
It is anti-, RN3Characterize the impedance of third field-effect tube 24.
It is all by the first field-effect tube N in such as 99.9% or more time in specific implementation process1Holding is led
Lead to realize and work normally, wherein electric current is from power input VIN via the first field-effect tube N1With the second field-effect tube
N2Parallel port and third field-effect tube N3Flow into load RloadAfter pass back into ground GND, in the time for being, for example, less than 0.1%
It needs to know and the first field-effect tube N is flowed through by power input VIN at this time1With the second field-effect tube N2Parallel port again by
Three field-effect tube N3Into load RloadElectric current when, control chip (that is: App Specific referred to above
Ctrl charge pump control unit (that is: Charge Pump Ctrl)) first ensures the second field-effect tube N2It remains on, so
After turn off the first field-effect tube N1Channel, at this time power input VIN to load RloadElectric current all flow through the second field-effect
Pipe N2, the current detection module (that is: Current Measure) of control chip (that is: App Specific Ctrl) can be with convection current
Through the second field-effect tube N2Electric current detected.Obtained electric current is to flow through the first field-effect tube N when working normally1With
Two field-effect tube N2Parallel port electric current.The detection of shutdown control chip exterior all the way when due to using in parallel but measurement
Current methods reduce the conducting resistance of crucial primary current path (i.e. power channel), and conducting resistance is by existing the relevant technologies
In RN1+RN3+ Rsense becomes the R in specific implementation processN1+RN3, access function when reducing normal power supply or charging work
Rate loss and fever.
In addition, the mode that control plus detection are integrated in control chip (that is: App Specific Ctrl) also optimizes system
Cost reduces circuit footprint and improves the accuracy and consistency of current detecting.
The present embodiment additionally provides a kind of electronic equipment, the current detection circuit and electricity being related to including above each optinal plan
Source channels.
In conclusion in the current detection circuit and electronic equipment of power channel provided in this embodiment avoiding that stream will be examined
Resistance is series at power channel, and uses the parallel branch in parallel with the first field-effect tube, need to detect running current
When information, the present embodiment can control the first field-effect tube shutdown by control module, and the parallel branch is able to maintain
Conducting, electric current enter load through parallel branch, and the current information of parallel branch can be with (the first field-effect when working normally at this time
Pipe with parallel branch when being both turned on) running current information it is associated, in turn, running current information can be according to parallel connection
Current information when branch is individually connected determined, for example, when the first field-effect tube and parallel branch impedance are sufficiently small, it can be opposite
It ignores in load, at this point, current information when measured parallel branch is individually connected can be used as running current
Information.
The present embodiment is based on parallel branch, current detection module and control module, and realizing has power channel electric current
Effect detection can be avoided while realizing effectively detection and connect inspection leakage resistance in power channel to reduce power channel
Power consumption and heat.
Simultaneously as the impedance of parallel branch can be not required to very little, the on the one hand measurement of the readily available higher electric current of energy
Precision, the type selecting range of device will not be too small and limited because of inspection leakage resistance in another aspect current detection module, and then may be adapted to
Use more inexpensive device, it is seen then that the present embodiment can be also convenient for combining detection accuracy and cost.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (10)
1. a kind of current detection circuit of power channel, the power channel includes sequentially connected power input, first
Effect pipe and load, which is characterized in that the current detection circuit includes: parallel branch, current detection module and control module；
The parallel branch is parallel to the both ends of first field-effect tube；
The control module connects the grid of first field-effect tube, in the normal work that need to determine the power channel
When current information, the first field-effect tube shutdown is controlled；
The parallel branch can be held on when that need to determine the running current information；
The current detection module connects the parallel branch, for detecting the current information of the parallel branch, so that institute
State that running current information can be turned off according to first field-effect tube and when parallel branch is connected described in parallel props up
The current information on road is determined.
2. current detection circuit according to claim 1, which is characterized in that be equipped with the second field-effect in the parallel branch
Pipe, second field-effect tube can be held on when that need to determine the running current information.
3. current detection circuit according to claim 2, which is characterized in that the current detection module includes and described
The size of two field-effect tube is in the mirror image field-effect tube and analog-digital converter of proportionate relationship, the mirror image field-effect tube and institute
The resistance of configuration is connected, and one end ground connection for being not connected with the mirror image field-effect tube of the resistance, the analog-digital converter can
Acquire the pressure drop for characterizing the resistance of current information.
4. current detection circuit according to claim 1, which is characterized in that impedance caused by first field-effect tube
Less than impedance caused by the parallel branch.
5. current detection circuit according to claim 1, which is characterized in that the control module includes that charge pump control is single
Member, an output end of the charge pump control unit connect the grid of first field-effect tube, need to determine the electricity
When the running current information of source channels, the first field-effect tube shutdown is controlled.
6. current detection circuit according to any one of claims 1 to 5, which is characterized in that the current detection module is also
Data processing module is connected, first field-effect tube turns off the data processing module and the parallel branch is led for obtaining
The current information of parallel branch when logical, and the running current information is determined according to the current information.
7. current detection circuit according to any one of claims 1 to 5, which is characterized in that the control module is also connected with
The grid of third field-effect tube, the third field-effect tube be set to the power channel, and be set to first field-effect tube with
Between the load.
8. current detection circuit according to any one of claims 1 to 5, which is characterized in that the control module is also connected with
The parallel branch, is used for:
The parallel branch is controlled to be held in normal work with when need to determine the running current information, and/or:
The voltage of the power input occur over-voltage and it is under-voltage when control parallel branch shutdown；
The control module is also used to: in normal work, controlling the first field-effect tube conducting.
9. current detection circuit according to any one of claims 1 to 5, which is characterized in that the parallel branch, the electricity
Stream detection module and the control module are integrated in same control chip.
10. a kind of electronic equipment, which is characterized in that including the described in any item current detection circuits of claim 1 to 9 and power supply
Channel.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910746998.2A CN110426549A (en) | 2019-08-14 | 2019-08-14 | The current detection circuit and electronic equipment of power channel |
| PCT/CN2020/108148 WO2021027768A1 (en) | 2019-08-14 | 2020-08-10 | Current measurement circuit for power channel, and electronic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910746998.2A CN110426549A (en) | 2019-08-14 | 2019-08-14 | The current detection circuit and electronic equipment of power channel |
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| Publication Number | Publication Date |
|---|---|
| CN110426549A true CN110426549A (en) | 2019-11-08 |
Family
ID=68416133
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910746998.2A Pending CN110426549A (en) | 2019-08-14 | 2019-08-14 | The current detection circuit and electronic equipment of power channel |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN110426549A (en) |
| WO (1) | WO2021027768A1 (en) |
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| CN111257786A (en) * | 2020-02-26 | 2020-06-09 | 维沃移动通信有限公司 | Working current self-checking circuit and method and electronic equipment |
| WO2021027768A1 (en) * | 2019-08-14 | 2021-02-18 | 上海爻火微电子有限公司 | Current measurement circuit for power channel, and electronic device |
| CN113866658A (en) * | 2021-12-01 | 2021-12-31 | 荣耀终端有限公司 | Electric quantity information acquisition circuit and equipment |
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| WO2021027768A1 (en) | 2021-02-18 |
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