CN104181380B - Underloading current detecting system - Google Patents
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- CN104181380B CN104181380B CN201310195867.2A CN201310195867A CN104181380B CN 104181380 B CN104181380 B CN 104181380B CN 201310195867 A CN201310195867 A CN 201310195867A CN 104181380 B CN104181380 B CN 104181380B
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- 238000001514 detection method Methods 0.000 claims abstract description 66
- 238000000034 method Methods 0.000 claims abstract description 28
- 238000004134 energy conservation Methods 0.000 claims abstract description 5
- 230000005611 electricity Effects 0.000 claims description 6
- 238000007689 inspection Methods 0.000 claims description 5
- JEIPFZHSYJVQDO-UHFFFAOYSA-N ferric oxide Chemical compound O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000002699 waste material Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 2
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Abstract
A kind of underloading current detecting system, in order to detect the current value of load under a light-load mode, and comprise a detection process module and a control circuit, detection process module comprises a power energy-saving unit and a voltage detection module, power energy-saving unit is in order to send out a power energy-saving signal, one cycle of power energy-saving signal is corresponding or corresponding with a switching state of power switch for deadline with a switching.Voltage detection module, in order to detect an input voltage value of input voltage source, is used and is produced and export a detection signal.Control circuit is provided with the data synopsis of a corresponding relation comprising cycle, current value and input voltage value, and it is provided with a threshold value, in order to receiving power energy-conservation signal and detection signal, to draw current value according to data synopsis, and judge whether reach threshold value, in order to judged result be when, closing switch under light-load mode.
Description
Technical field
The present invention relates to a kind of underloading current detecting system, more particularly, to one kind judge underloading electricity according to data synopsis
Whether the current value of stream reaches threshold value, and then judges whether the underloading current detecting system of closing switch.
Background technology
With the progress and development in epoch, the requirement to the service efficiency of the switching power unit of such as portable power source in recent years
In, by paying attention to fully loaded and heavily loaded efficiency in the past, gradually it is changed to be fully loaded with, underloading and efficiency are laid equal stress on.User makes
When mobile phone being charged with power-supply adapter, after battery fills and satisfies, mobile phone screen can show mobile phone charging complete, and user
After seeing, need to certainly be about to power supply and remove, thus result in the inconvenience of user.
In the application of portable power source, underloading current detecting can allow user have more preferably convenience and usability, enters
For one step, in portable power source, due to there being microcontroller（Micro Control Unit;MCU）Assistance it is possible to utilize
Application circuit is detecting mobile phone whether charging complete, and after mobile phone charging complete, microcontroller is notified that application circuit will supply
Answer dump, system so can be allowed to enter low power consumption or park mode.
However, in the application circuit of existing above-mentioned underloading current detecting, it needs specific element can reach, citing
For, in application on the market, mainly use amplifier circuit and load current is converted into after the amplification of the signal after voltage, then
This signal amplifying is provided to processor, but this kind of mode with the following drawback that：1., because voltage signal is small, need to make
Use low offset（Low Offset）Precision amplifier, but using this precision amplifier can cause manufacturing cost raising and
The waste of area, and it is unfavorable for compact development.2. need a sensing resistance that load current is converted into voltage, but use
This sensing resistance is easily caused energy loss and has the low situation of conversion efficiency.
Content of the invention
In application circuit in view of existing underloading current detecting, generally have high manufacturing cost, high area waste with
And the problem that conversion efficiency is low.Edge this, present invention is primarily targeted at provide a kind of underloading current detecting system, it is mainly
In application circuit, store a data synopsis simulated in advance, use and detect underloading electric current according to this data synopsis
Current value, to judge whether closing switch.
Based on above-mentioned purpose, technical way of the present invention provides a kind of underloading current detecting system, in order to
Under a light-load mode, a light current-carrying current value of detection one load, load is electrically connected at a switch, underloading electric current
Detecting system comprises a detection process module and a control circuit.Detection process module is electrically connected at an input voltage source,
And it is electrically connected at load via switch, detection process module comprises a power energy-saving unit and a voltage detection module.
Power energy-saving unit in order under light-load mode, to send out a power energy-saving signal, a cycle of power energy-saving signal is and one
Switching is corresponding for deadline.Voltage detection module is electrically connected at input voltage source, and in order to detect input voltage source is defeated
Enter magnitude of voltage, use and produce and export a detection signal.
Control circuit is provided with the data synopsis of a corresponding relation comprising cycle, current value and input voltage value, and sets
There is a threshold value, and be electrically connected at power energy-saving unit, voltage detection module and switch, in order to receiving power energy-conservation signal and inspection
Survey signal, use according to data synopsis, cycle and input voltage value, draw current value, and judge whether current value reaches
To threshold value, in order to when judged result is to be, closing switch under light-load mode.
In addition, another technical way of the present invention be provide a kind of underloading current detecting system, its with upper
The difference stated is to send out a power energy-saving signal by power switch, and a cycle of power energy-saving signal is and a switching
State is corresponding, and this switching state is for one of switching time and switch pulse number, and the above-mentioned cycle is mainly foundation
The switching of power switch determines with stopping the time ratio of switching state；Or the quantity according to the switch pulse in power switch
And determine, and then make control circuit according to data synopsis, cycle and input voltage value, draw current value, and judge electricity
Whether flow valuve reaches threshold value, in order to judged result be when, closing switch under light-load mode.
Wherein, in the preferred embodiment of attached technological means of above-mentioned underloading current detecting system, control circuit is for one
Microcontroller（Micro Control Unit;MCU）Or other can perform and process and control, detection process module further includes one and opens
Dynamic input, control circuit system is electrically connected at detection process module via starting input, uses and judges in control circuit
When current value reaches threshold value, synchronism output one shutdown signal, to starting input, closes detection process module according to this, light to close
Carry current detecting system.Additionally, load is at least one of a mobile phone, flat board, mobile computer.
After underloading current detecting system of the present invention, due to being not required to using precision amplifier and sensing electricity
Resistance, it is only necessary to can complete gently current-carrying detection by data synopsis, manufactures thus without there being the height existing for prior art
Cost, the waste of high area and the low problem of conversion efficiency.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Brief description
Fig. 1 shows the block diagram of the underloading current detecting system of the present invention first preferred embodiment；
Fig. 2 shows the circuit diagram of the underloading current detecting system of the present invention first preferred embodiment；
Fig. 3 shows the schematic diagram of the data synopsis of the present invention；
Fig. 4 shows the block diagram of the underloading current detecting system of the present invention second preferred embodiment；And
Fig. 5 shows the power energy-saving signal of the present invention and the waveform corresponding diagram of power switch.
Wherein, reference
1st, 1a underloading current detecting system
11st, 11a detection process module
111st, 111a power energy-saving unit
112nd, 112a voltage detection module
113rd, 113a starts input
114th, 114a power switch
115 comparators
116 compensators
117 compensation comparators
12nd, 12a control circuit
2nd, 2a load
3rd, 3a switch
4th, 4a input voltage source
S1, S1a power energy-saving signal
S2, S2a detection signal
S3, S3a shutdown signal
S4a power change detection signal
I, Ia underloading electric current
T1, t2 time interval
Specific embodiment
Because, in underloading current detecting system provided by the present invention, a combination thereof embodiment is too numerous to enumerate, therefore here is not
Repeat one by one again, only enumerate two preferred embodiments to be illustrated.
See also Fig. 1 and Fig. 2, Fig. 1 shows the side of the underloading current detecting system of the present invention first preferred embodiment
Frame schematic diagram, Fig. 2 shows the circuit diagram of the underloading current detecting system of the present invention first preferred embodiment.As illustrated,
In the underloading current detecting system 1 that the present invention first preferred embodiment is provided, in order to, under a light-load mode, detection one loads
One current value of a 2 underloading electric current I, load 2 is electrically connected at a switch 3, and wherein, load 2 is a mobile phone, flat board, notes
At least one of type computer, but not limited to this, any device that can be used for charging can be all load of the present invention.
Underloading current detecting system 1 comprises a detection process module 11 and a control circuit 12, detection process module 11 electricity
Property be connected to an input voltage source 4, and via switch 3 and be electrically connected at load 2, wherein, detection process module 11 is for example
Can be for direct current to direct current（DC to DC）Process circuit, but in other embodiments, not limited to this.
Detection process module 11 is just via an inductance（Figure does not indicate）, diode（Figure does not indicate）, electric capacity（Figure does not indicate）
And two electric groups（Figure does not indicate）And with switch 3 electric connection, in the visual practical application of design of its circuit using and
Change.Detection process module 11 comprises a power energy-saving unit 111, a voltage detection module 112, starts input 113,
Power switch 114, a comparator 115, a compensator 116 and a compensation comparator 117.
Power energy-saving unit 111 be can be general circuit realizing, voltage detection module 112 is can existing detection electricity
The circuit of pressure is realizing, and voltage detection module 112 is electrically connected at input voltage source 4.Starting input 113 is, for example, to detect
One of processing module 11 input pin position（Pin foot）, in addition, power switch 114（Identical with the power switch 114a of Fig. 4）Will
Described in second embodiment.Comparator 115 is that to receive one from the partial pressure of two above-mentioned resistance related to load 2 anti-
Feedthrough voltage, and comparator 115 is provided with a voltage fiducial value, in order to be compared with above-mentioned feedback voltage.Compensator 116 is electrical
It is connected to comparator 115, and compensator 116 can be existing compensation circuit, therefore no longer repeated, and compensate comparator
117 are electrically connected at comparator 115 and compensator 116, and compensation comparator 117 can be existing comparator, therefore no longer
Repeated.
Control circuit 12 is electrically connected at power energy-saving unit 111, voltage detection module 112 and switch 3.Additionally, at this
Invent in the first preferred embodiment, control circuit 12 is to be electrically connected at detection process module 11 via startup input 113, and
Control circuit 12 is for a microcontroller（Micro Control Unit;MCU）, and in other embodiments, control circuit 12
Can program logic device for complexity（Complex Programmable Logic Device;CPLD）Integrated with application-specific
Circuit（Application-Specific Integrated Circuit;ASIC）One of the control circuit that formed.
Wherein, further referring to Fig. 3, Fig. 3 shows the schematic diagram of the data synopsis of the present invention, power energy-saving unit
111 is in order under light-load mode, to send out a power energy-saving signal S1, and the cycle of power energy-saving signal S1 is and a switching
Deadline is corresponding.Specifically, as shown in figure 3, the cycle of the present invention the first preferred embodiment indication is for power energy-saving
The responsibility cycle of signal S1, its ratio is can be corresponding with the time of the switching cut-off of underloading current detecting system 1, real at other
Applying can be corresponding for pent deadline with power switch 114 in example, but not limited to this.And when above-mentioned cycle and switching cut-off
Between corresponding relation e.g. can be simulated in advance by simulation softward.
Additionally, it is noted that in the present invention first preferred embodiment, power energy-saving signal S1 is relevant with load
Lian Xing, its be by feedback voltage compare with the voltage fiducial value of comparator 115 after, compensated device 116 and compensation compare
The setting of device 117 and determine power energy-saving signal S1.
Voltage detection module 112 is to detect an input voltage value of input voltage source 4, uses and produces and export an inspection
Survey signal S2, this detection signal S2 represents above-mentioned input voltage value.In control circuit 12, it is provided with one and comprises cycle, underloading
The current value of electric current I and the data synopsis of the corresponding relation of input voltage value（As shown in Figure 3）, and it is provided with a threshold value, and on
The data synopsis nine stated is to be simulated in advance by simulation softward in advance, and the demand in the visual practical application of above-mentioned threshold value
And set.
Control circuit 12 is after receiving power energy-conservation signal S1 and detection signal S2, according to data synopsis, the cycle with
Input voltage value, draws the current value of underloading electric current I, and judges whether current value reaches set threshold value, use
When judged result is to be, closing switch 3 under light-load mode, and its method closed e.g. sends out a signal（Figure is not
Show）.
Wherein, as shown in figure 3, curve 100 is current value is 5mA and the corresponding relation of cycle and input voltage value, curve
200 is 10mA, and curve 300 is 20mA, and curve 400 is 50mA, and therefore, control circuit 12 can be sentenced according to this data synopsis
Break and the current value of underloading electric current I.For example, when input voltage value is for 4V, and control circuit 12 detects the cycle and is less than
7.5%, now the current value of corresponding underloading electric current I be judged to 10mA, therefore, when threshold value is for 10mA, control circuit 12 is
Closing switch 3 and enter into low power consumption or park mode.
In addition, when control circuit 12 judges that current value reaches set threshold value, being synchronism output one shutdown signal
S3, to starting input 113, closes detection process module 11 according to this, and then closes underloading current detecting system 1, uses and more reduces
The situation of power consumption.
See also Fig. 4, Fig. 4 shows that the square frame of the underloading current detecting system of the present invention second preferred embodiment is illustrated
Figure.Detection process module as illustrated, the place different from the first preferred embodiment is, in underloading current detecting system 1a
11a, except starting in addition to input 113a using power energy-saving unit 111a, voltage detection module 112a and one, more only utilizes a work(
Rate switch 114a carries out gently current-carrying detection, and this power switch 114a is electrically connected at power energy-saving unit 111a and control
Circuit 12a, additionally, power switch 114 function phase in power switch 114a and the first preferred embodiment is with therefore, only the
In two preferred embodiments, further illustrate the function of power switch 114a.
See also Fig. 4 and Fig. 5, Fig. 5 shows the power energy-saving signal of the present invention and the waveform corresponding diagram of power switch.
As illustrated, power energy-saving unit 111a is in order to, under light-load mode, to send out power energy-saving signal by power switch 114a
The cycle of S1a, power energy-saving signal S1a is corresponding with a switching state of power switch 114a, and control circuit 12a is connecing
After receiving power energy-saving signal S1a, it is to learn above-mentioned switching state.Additionally, this switching state is for a switching time and one
One of switch pulse number.In addition, power energy-saving unit 111a can be by sending out power change detection signal S4a to power
Switch 114a and make power switch 114a send out power energy-saving signal S1a, and the running of remaining each element is all preferable with first
Embodiment is identical, and therefore here is no longer repeated.
For example, when switching state is for switching time, this switching time refers to switching and the stopping of power switch
The time ratio of switching time, furthermore, as shown in figure 5, when time interval t1 is the running of power change detection signal S4a
Between（High levle）, now power switch 114a can stop switch, and time interval t2 be power change detection signal S4a be located at low
Level, now power switch 114a can start switch, therefore, power switch 114a can be sent according to power energy-saving unit 111a
The switching time of power change detection signal S4a going out and the time stopping switching, the cycle that sends out corresponds to switching time
Power energy-saving signal S1a, therefore, control circuit 12a can be by power energy-saving signal S1a and detection signal S2a, according to data
Synopsis and find out the current value of current underloading electric current Ia, when control circuit 12a judges that current value reaches threshold value, synchronous defeated
Go out shutdown signal S3a to start input 113a, according to this close detection process module 11a, and remaining all with the first preferable reality
Apply example identical, here is no longer repeated.
Again for example, when switching state is for switch pulse number, in unit interval interval range（In the present invention
It is, for example, t1+t2 in two preferred embodiments）, when loading 2a and being lighter, time interval t2 can reduce, in the therefore above-mentioned unit interval
Pulse number also can reduce；Conversely, when load 2a becomes weight, the time interval t2 time can increase, the umber of pulse in the unit interval
Mesh also can increase, therefore, in actual applications an exportable cycle correspond to pulse number power energy-saving signal S1a, and then
Make control circuit 12a by power energy-saving signal S1a and detection signal S2a, find out according to data synopsis current light
Carry the current value of electric current Ia, and remaining is all identical with above-mentioned and the first preferred embodiment, here is no longer repeated.
Comprehensive the above, after employing underloading current detecting system 1 of the present invention and method, due to not
Using precision amplifier and resistance need to be sensed it is only necessary to gently current-carrying detection can be completed by data synopsis, thus without
Have high manufacturing cost existing for prior art, the waste of high area and the low problem of conversion efficiency, so reach low cost,
Simplifying and effect of high conversion efficiency, meet industry applications in fact.
Certainly, the present invention also can have other various embodiments, in the case of without departing substantially from present invention spirit and its essence, ripe
Know those skilled in the art and work as and various corresponding changes and deformation can be made according to the present invention, but these corresponding changes and change
Shape all should belong to the protection domain of appended claims of the invention.
Claims (9)
1. a kind of underloading current detecting system, in order under a light-load mode, a light current-carrying electric current of detection one load
Value, this load is electrically connected at a switch it is characterised in that this underloading current detecting system comprises：
One detection process module, is electrically connected at an input voltage source, and is electrically connected at this load via this switch, this inspection
Survey processing module to comprise：One power energy-saving unit, in order under this light-load mode, to send out a power energy-saving signal, this power
One cycle of energy-conservation signal is corresponding for deadline with a switching of this underloading current detecting system；And a voltage detection module,
It is electrically connected at this input voltage source, in order to detect an input voltage value of this input voltage source, use and produce and export an inspection
Survey signal；And
One control circuit, is provided with the data synopsis of a corresponding relation comprising this cycle, this current value and this input voltage value,
And be provided with a threshold value, and it is electrically connected at this power energy-saving unit, this voltage detection module and this switch, in order to receive this power
Energy-conservation signal and this detection signal, use according to this data synopsis, this cycle and this input voltage value, draw this current value,
And judge whether this current value reaches this threshold value, in order to when judged result is to be, to close this under this light-load mode and to open
Close.
2. underloading current detecting system according to claim 1 is it is characterised in that this control circuit is a microcontroller.
3. underloading current detecting system according to claim 1 is it is characterised in that this detection process module further includes one and opens
Dynamic input, this control circuit is electrically connected at this detection process module via this startup input, uses in this control circuit
When judging that this current value reaches this threshold value, synchronism output one shutdown signal, to this startup input, is closed at this detection according to this
Reason module.
4. underloading current detecting system according to claim 1 is it is characterised in that this load is a mobile phone, flat board, notes
At least one of type computer.
5. a kind of underloading current detecting system, in order under a light-load mode, a light current-carrying electric current of detection one load
Value, this load is electrically connected at a switch it is characterised in that this underloading current detecting system comprises：
One detection process module, is electrically connected at an input voltage source, and is electrically connected at this load via this switch, this inspection
Survey processing module to comprise：One power energy-saving unit, is electrically connected at a power switch, in order under this light-load mode, by this
Power switch sends out a power energy-saving signal, a switching state phase of a cycle of this power energy-saving signal and this power switch
Corresponding；And a voltage detection module, it is electrically connected at this input voltage source, in order to detect an input electricity of this input voltage source
Pressure value, uses and produces and export a detection signal；And
One control circuit, is provided with the data synopsis of a corresponding relation comprising this cycle, this current value and this input voltage value,
And be provided with a threshold value, and it is electrically connected at this power switch, this voltage detection module and this switch, in order to receive this power energy-saving
Signal and this detection signal, use according to this data synopsis, this cycle and this input voltage value, draw this current value, and
Judge whether this current value reaches this threshold value, in order to when judged result is to be, to close this switch under this light-load mode.
6. underloading current detecting system according to claim 5 it is characterised in that this switching state be a switching time with
One of one switching umber of pulse.
7. underloading current detecting system according to claim 5 is it is characterised in that this control circuit is a microcontroller.
8. underloading current detecting system according to claim 5 is it is characterised in that this detection process module further includes one and opens
Dynamic input, this control circuit is electrically connected at this detection process module via this startup input, uses in this control circuit
When judging that this current value reaches this threshold value, synchronism output one shutdown signal, to this startup input, is closed at this detection according to this
Reason module.
9. underloading current detecting system according to claim 5 is it is characterised in that this load is a mobile phone, flat board, notes
At least one of type computer.
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| CN201310195867.2A CN104181380B (en) | 2013-05-23 | 2013-05-23 | Underloading current detecting system |
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|---|---|---|---|
| CN201310195867.2A CN104181380B (en) | 2013-05-23 | 2013-05-23 | Underloading current detecting system |
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| CN104181380B true CN104181380B (en) | 2017-03-01 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106324346B (en) * | 2015-06-25 | 2019-03-22 | 台湾类比科技股份有限公司 | Waveform drop point detection circuit |
| CN106855588B (en) * | 2016-12-23 | 2023-10-03 | 建荣半导体（深圳）有限公司 | Current detection chip, power supply equipment and electronic equipment |
| CN106771540B (en) * | 2016-12-23 | 2023-09-29 | 建荣半导体（深圳）有限公司 | Current detection circuit and method thereof, chip and power supply equipment |
| CN112433113A (en) * | 2020-11-06 | 2021-03-02 | 上海芯导电子科技股份有限公司 | Light load detection system |
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| CN104181380A (en) | 2014-12-03 |
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Effective date of registration: 20180827 Address after: 1, 7 yuan, 2 yuan 1 Street, Hsinchu, Taiwan, China Patentee after: Advanced Analog Technology, Inc. Address before: Taiwan Hsinchu County Tai Yuan Street China jhubei City, No. 38 3 floor 8 Patentee before: Yuanxiang Technology Co., Ltd. |