CN203117298U - Capacitance detection circuit - Google Patents
Capacitance detection circuit Download PDFInfo
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- CN203117298U CN203117298U CN 201320050626 CN201320050626U CN203117298U CN 203117298 U CN203117298 U CN 203117298U CN 201320050626 CN201320050626 CN 201320050626 CN 201320050626 U CN201320050626 U CN 201320050626U CN 203117298 U CN203117298 U CN 203117298U
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Abstract
The utility model provides a capacitance detection circuit comprising a charging module, a first capacitor, an electric charge transfer module, a charging discharging module, a comparator, a time sequence signal output module, and a processor. The processor can be used to determine whether the capacitor to be detected is changed according to a comparison result. The charging module is connected with the other end of the capacitor to be detected and the time sequence signal output module at the same time. The other end of the capacitor to be detected is electrically connected with one end of the first capacitor by the electric charge transfer module. The electric charge transfer module is electrically connected with the time sequence signal output module. One end of the first capacitor is connected with an input end of the comparator at the same time, and the other end of the first capacitor is grounded. An output end of the comparator is connected with the processor. The charging discharging module is electrically connected with the charge transfer module, the time sequence signal output module, and the end of the first capacitor. By using the capacitance detection circuit, the external interference can be reduced, and the change of the capacitor can be detected accurately.
Description
Technical field
The utility model relates to a kind of testing circuit, relates in particular to a kind of capacitive detection circuit.
Background technology
At present, whether a lot of electronic products or circuit need detect changing on the capacity cell.For example, use increasing touch-screen, touch-screen is in mobile phone, PDA(personal digital assistant), the GPS(GPS), PMP(MP3, MP4 etc.) or even electronic equipment such as panel computer in obtained application.Touch-screen has that touch control operation is simple, convenient, the advantage of hommization, so touch-screen is expected to become the best interface of human-computer interaction and has obtained widespread use in portable set.And along with the widespread use of touch-screen, people are also more and more deep to the research of touch screen technology.
Judge by the situation of change that detects the self-capacitance that sensing unit forms in the touch-screen whether sensing unit is touched often in the prior art, therefore how accurately detecting the variation that self-capacitance produces when being touched in the touch-screen becomes very important.It is the relaxor that constantly discharges and recharges with that traditional capacitance touch induction detects, when not touching, relaxor has fixing discharging and recharging the cycle, after object to be detected is touched, electric capacity is increased, and the cycle of relaxor this moment will become greatly, just can judge by the variation of test period whether object to be detected is touched, this detection method is interfered easily, accuracy of detection and poor stability.Also there is the interference that is vulnerable to extraneous factor usually in the circuit of the situation of change of other detection testing capacitance, produce the defective of certain error when often causing detecting, therefore, the antijamming capability of the testing circuit that whether detection electric capacity changes in the prior art is relatively poor, accuracy of detection is not high enough.
Be understandable that the statement of this part only provides the background information relevant with the utility model, may constitute or not constitute so-called prior art.
Summary of the invention
When whether technical problem to be solved in the utility model is to detect electric capacity and change at capacitive detection circuit in the prior art antijamming capability relatively poor, detect not accurate enough defective, provide a kind of and have better anti-jamming capability, detect capacitive detection circuit accurately.
The technical scheme that its technical matters that solves the utility model adopts provides a kind of capacitive detection circuit, one end ground connection of testing capacitance, capacitive detection circuit comprises: be used for the charging module to the testing capacitance charging, first electric capacity, be used for the electric charge on the testing capacitance is transferred to the electric charge shift module of first electric capacity, be used for charge-discharge modules that electric charge shift module and first electric capacity are charged and discharges, be used for comparer that the voltage on first electric capacity and preset threshold value voltage VTH are compared, the clock signal output module that is used for above-mentioned each the module work of control, and judge the processor whether testing capacitance changes according to the comparative result of comparer; Wherein, charging module is connected with the other end and the clock signal output module of described testing capacitance simultaneously, the other end of described testing capacitance is electrically connected with an end of first electric capacity by the electric charge shift module, and described electric charge shift module is electrically connected with described clock signal output module, one end of described first electric capacity connects the input end of described comparer simultaneously, the other end ground connection of first electric capacity, the described processor of output termination of comparer, charge-discharge modules are electrically connected described electric charge shift module, clock signal output module simultaneously, reach an end of described first electric capacity.
In above-mentioned capacitive detection circuit, described processor comprises according to the comparative result of described comparer and generates the trigger of trigger pip, the counter counted according to described trigger pip, detects the detecting device whether described testing capacitance changes according to the count value of described counter; The input end of described trigger links to each other with the output terminal of described comparer, and the input end of described counter links to each other with the output terminal of described trigger.
In above-mentioned capacitive detection circuit, described charging module comprises first switch and the first power supply VCC1, and described first switch is connected between the other end of the first power supply VCC1 and described testing capacitance, and first switch is electrically connected described clock signal output module.
In above-mentioned capacitive detection circuit, described electric charge shift module comprises the transfer electric capacity in parallel with described first electric capacity, second switch, reaches the 3rd switch; One end ground connection of described transfer electric capacity, the other end that shifts electric capacity connects an end of second switch and an end of the 3rd switch simultaneously, and the other end of electric capacity, an end of described first electric capacity of another termination of the 3rd switch are surveyed in the other end reception of second switch.
In above-mentioned capacitive detection circuit, described charge-discharge modules comprises second source VCC2, the 4th switch, reaches the 5th switch, and the 5th switch in parallel is in the two ends of described transfer electric capacity, and second source VCC2 connects the other end of described transfer electric capacity by the 4th switch.
In above-mentioned capacitive detection circuit, described charge-discharge modules also comprises the 6th switch that is parallel to the first electric capacity two ends.
In above-mentioned capacitive detection circuit, described processor also comprises the selector switch of controlling described charge-discharge modules according to the comparative result of described comparer, and described selector switch is connected between described comparer and the 4th switch.
In above-mentioned capacitive detection circuit, described selector switch is rejection gate, and the first input end of described rejection gate links to each other with the output terminal of described trigger, and second input end of described rejection gate is connected with described clock signal output module.
In above-mentioned capacitive detection circuit, described processor also comprises the selector switch of controlling described charge-discharge modules according to the comparative result of described comparer, and described selector switch is connected between described comparer and the 4th switch.
In above-mentioned capacitive detection circuit, described trigger is d type flip flop.
The capacitive detection circuit that the utility model provides, it connects for the charging module that charges to testing capacitance, by the electric charge shift module electric charge on the testing capacitance is transferred to first electric capacity again by the end at testing capacitance.So, when the electric capacity on the testing capacitance changes, this variation is transferred to first electric capacity by the electric charge shift module, in conjunction with comparer the voltage on first electric capacity and preset threshold value voltage are compared, and the work by above-mentioned each module of clock signal output module control, then the capacitive detection circuit that provides of the utility model can directly detect the electric charge situation that shifts in conjunction with comparer by processor, whether can indirect detection go out testing capacitance changes, so it can avoid extraneous interference, and its detection to capacitance variations is more accurate.
Description of drawings
Fig. 1 is the theory diagram of the capacitive detection circuit that provides of the utility model;
Fig. 2 is the circuit theory diagrams of a preferred embodiment of the capacitive detection circuit that provides of the utility model;
Fig. 3 is the structural representation that processor connects comparer in the preferred embodiment of the capacitive detection circuit that provides of the utility model.
Embodiment
Clearer for technical matters, technical scheme and beneficial effect that the utility model is solved, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
In description of the present utility model, it will be appreciated that, term " vertically ", " laterally ", " on ", D score, " preceding ", " back ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", close the orientation of indications such as " outward " or position is based on orientation shown in the drawings or position relation, only be the utility model and simplification description for convenience of description, rather than device or the element of indication or hint indication must have specific orientation, with specific orientation structure and operation, therefore can not be interpreted as restriction of the present utility model.
To shown in Figure 3, whether the capacitive detection circuit that the utility model provides changes mainly for detection of testing capacitance referring to Fig. 1.One end ground connection of testing capacitance, another termination capacitive detection circuit of testing capacitance.Concrete, capacitive detection circuit comprises: charging module 1, first electric capacity, electric charge shift module 2, charge-discharge modules 3, comparer 4, clock signal output module 6 and processor 5.Wherein, charging module 1 is connected with the other end and the clock signal output module 6 of described testing capacitance simultaneously, the other end of described testing capacitance is electrically connected with an end of first electric capacity by electric charge shift module 2, and described electric charge shift module 2 is electrically connected with described clock signal output module 6, one end of described first electric capacity connects the input end of described comparer 4 simultaneously, the other end ground connection of first electric capacity, the described processor of output termination of comparer 4, charge-discharge modules 3 is electrically connected described electric charge shift module 2 simultaneously, clock signal output module 6, an and end of described first electric capacity.Charging module 1 is used for to the testing capacitance charging, and electric charge shift module 2 is used for the electric charge on the testing capacitance is transferred to first electric capacity, and charge-discharge modules 3 is used for electric charge shift module 2 and first electric capacity are charged and discharges.Comparer 4 is used for the voltage on first electric capacity and preset threshold value voltage VTH are compared, and processor 5 is used for judging according to the comparative result of comparer 4 whether testing capacitance changes.The capacitive detection circuit that the utility model provides is by the work of different above-mentioned each module of clock signal control of clock signal output module output, it makes 3 pairs of first electric capacity of charge-discharge modules earlier and shifts electric capacity and charge simultaneously, so that the voltage on first electric capacity is near preset threshold value voltage VTH, again testing capacitance is charged, when influences such as testing capacitance is subjected to touching cause electric capacity on it to change, electric charge on the testing capacitance also can change, and testing capacitance is transferred to first electric capacity by electric charge shift module 2 with the electric charge on it, and then judge voltage on first electric capacity greater than threshold voltage by comparer 4, the then level upset of comparer 4 outputs, whether and then whether processor can judge on the testing capacitance according to the comparative result of comparer 4 and change, can judge touch-screen and be touched by the user.
Refer again to Fig. 2 and preferred embodiment shown in Figure 3, processor comprises according to the comparative result of comparer 4 and generates the trigger 52 of trigger pip, the counter 53 counted according to trigger pip, detects the detecting device 54 whether testing capacitance changes according to the count value of counter 53; The input end of trigger 52 links to each other with the output terminal of comparer 4, the input end of counter 53 links to each other with the output terminal of trigger 52, detecting device 54 links to each other with the output terminal of counter 53, and clock signal output module 6 is electrically connected charging module 1, charge-discharge modules 3 simultaneously, reaches electric charge shift module 2.So, in this embodiment, clock signal output module 6 is exported different clock signals with the work of control charging module 1, charge-discharge modules 3 and electric charge shift module 2, and judges that by detecting device 54 count value of counter 53 can detect testing capacitance and whether change.Charging module 1 comprises first switch SW 1 and the first power supply VCC1, and described first switch SW 1 is connected between the first power supply VCC1 and the described testing capacitance Cx other end, and first switch SW 1 is electrically connected described clock signal output module 6.After certain clock enabling signal first switch SW 1 closure of clock signal output module output, charging module 1 can charge to capacitor C x to be measured.Preferably, described trigger 52 is d type flip flop 52, and it can keep comparer 4 result relatively synchronously.
Preferably, electric charge shift module 2 comprises transfer capacitor C mod, the second switch SW2 in parallel with the described first capacitor C b, reaches the 3rd switch SW 3; One end ground connection of described transfer electric capacity, the other end that shifts electric capacity connects the end of second switch SW2 and an end of the 3rd switch SW 3 simultaneously, the other end of electric capacity, an end of described first electric capacity of another termination of the 3rd switch SW 3 are surveyed in the other end reception of second switch SW2.So the clock signal output module can make the electric charge on the testing capacitance be transferred to first electric capacity by the break-make of control second switch SW2 and the 3rd switch SW 3.Further preferably, charge-discharge modules 3 comprises second source VCC2, the 4th switch SW 4, reaches the two ends that the 5th switch SW 5, the five switch SW 5 are parallel to described transfer electric capacity, and second source VCC2 connects the other end of described transfer electric capacity by the 4th switch SW 4.By controlling the break-make of the 5th switch SW 5, to realize carrying out pre-arcing to shifting electric capacity, can reduce like this or the interference in the filtering external world, by controlling the break-make of the 4th switch SW 4, carry out precharge and make the voltage that shifts on the electric capacity near threshold voltage VTH shifting electric capacity realizing.More preferably, charge-discharge modules 3 also comprises the 6th switch SW 6 that is parallel to the first electric capacity two ends, so, can make first electric capacity carry out pre-arcing during control closure the 6th switch SW 6, further reduce extraneous interference.
Again in conjunction with Fig. 2 and embodiment illustrated in fig. 3, the principle of work of the capacitive detection circuit that the utility model is provided roughly is described below:
The clock signal output module is controlled the break-make of first switch to the, six switches, to realize the work of control charging module, charge-discharge modules and electric charge shift module, clock signal output module output timing signal CLK_SW1, CLK_SW2, CLK_SW3, CLK_SW4, CLK_SW5, and CLK_SW6 control above-mentioned each module, wherein, clock signal partly is clock signal, and part be that common high-low level is with the output of the break-make of gauge tap or change logic gate.At first, the first capacitor C mod is carried out pre-arcing, namely earlier only make the 5th switch SW 5 closures, the electric charge on the first capacitor C mod is bled off (more preferably, simultaneously closed the 3rd switch and the 6th switch fall the charge discharging resisting that shifts on electric capacity and first electric capacity); Then, only closed the 4th switch SW 4 and the 3rd switch SW 3, second source VCC2 carries out precharge to shifting capacitor C mod and first electric capacity, near the voltage of Cmod is charged to predetermined threshold value VTH in advance; After precharge finishes, Closing Switch SW1, Cx is charged to VCC1 testing capacitance, disconnects SW1 then, only Closing Switch SW2, electric capacity on the Cx is transferred on the Cmod, in this process, the continuous closed and disconnected of SW3 is transferred to the electric charge that shifts on the capacitor C mod on the first capacitor C b, when the voltage on the Cb is higher than VTH, the comparer upset, the output high level is after high level carries out synchronously through d type flip flop, rolling counters forward increases, and after the comparer upset, the SW6 closure arrives ground with the charge discharge on the first capacitor C b, so circulation repeats above process.For example, when touch-screen was touched, the electric capacity on the testing capacitance increased, and then the increase of the electric charge on the testing capacitance, and the electric charge on the testing capacitance is transferred on transfer electric capacity and first electric capacity gradually.Voltage on the testing capacitance further increases, then the voltage on first electric capacity may be always than predetermined threshold value VTH height, the high level that makes comparator C MP export in cycle regular hour is more, and then rolling counters forward is more, and whether the situation of the high-low level that the counter in the processor and detecting device are exported in certain cycle according to comparer can be judged testing capacitance and change.When touch-screen is touched and is not touched, the electric capacity difference of Cx, the dutycycle of the square wave of trigger DFF output is also different, thus the count value of counter is also different, judges with this whether sensing unit is touched.So whether this testing circuit can be avoided extraneous interference, detect testing capacitance directly and accurately and change.What deserves to be explained is that SW1 and SW2 can be the non-overlapping clock of two-phase, SW5 and SW6 also can be the non-overlapping clock of two-phase, and the frequency of SW1, SW2 can be identical with SW6 with SW5, also can be inequality with SW5 and SW6.For example, when comparator output terminal when low, this moment SW1 and SW2 switch motion, and SW5 and SW6 switch disconnect.
Further, in the preferred embodiment that the utility model provides, as shown in Figure 2, this capacitive detection circuit also comprises the selector switch of controlling described charge-discharge modules according to the comparative result of described comparer, and described selector switch is connected between described comparer and the 4th switch.When comparer output high level, selector switch is controlled the 4th switch break-make selectively, and then the control charge-discharge modules.Preferably, selecting device is rejection gate, and the first input end of described rejection gate links to each other with the output terminal of described trigger, and second input end of described rejection gate is connected with described clock signal output module, for example, clock signal output module output PRE_CHRG signal is to second input end of rejection gate.This is simple in structure, and precise control.
In the description of this instructions, concrete feature, structure, material or characteristics that the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means in conjunction with this embodiment or example description are contained at least one embodiment of the present utility model or the example.In this manual, the schematic statement to above-mentioned term not necessarily refers to identical embodiment or example.And concrete feature, structure, material or the characteristics of description can be with the suitable manner combination in any one or more embodiment or example.
In description of the present utility model, unless otherwise prescribed and limit, need to prove that term " installation ", " linking to each other ", " connection " should be done broad understanding, for example, can be mechanical connection or electrical connection, also can be the connection of two element internals, can be directly to link to each other, and also can link to each other indirectly by intermediary, for the ordinary skill in the art, can understand the concrete implication of above-mentioned term as the case may be.
The above only is preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of within spirit of the present utility model and principle, doing, be equal to and replace and improvement etc., all should be included within the protection domain of the present utility model.
Claims (10)
1. capacitive detection circuit, an end ground connection of testing capacitance is characterized in that capacitive detection circuit comprises:
Be used for the charging module to the testing capacitance charging, first electric capacity, be used for the electric charge on the testing capacitance is transferred to the electric charge shift module of first electric capacity, be used for charge-discharge modules that electric charge shift module and first electric capacity are charged and discharges, be used for comparer that the voltage on first electric capacity and preset threshold value voltage VTH are compared, the clock signal output module that is used for above-mentioned each the module work of control, and judge the processor whether testing capacitance changes according to the comparative result of comparer;
Wherein, charging module is connected with the other end and the clock signal output module of described testing capacitance simultaneously, the other end of described testing capacitance is electrically connected with an end of first electric capacity by the electric charge shift module, and described electric charge shift module is electrically connected with described clock signal output module, one end of described first electric capacity connects the input end of described comparer simultaneously, the other end ground connection of first electric capacity, the described processor of output termination of comparer, charge-discharge modules are electrically connected described electric charge shift module, clock signal output module simultaneously, reach an end of described first electric capacity.
2. capacitive detection circuit as claimed in claim 1, it is characterized in that described processor comprises according to the comparative result of described comparer and generates the trigger of trigger pip, the counter counted according to described trigger pip, detects the detecting device whether described testing capacitance changes according to the count value of described counter;
The input end of described trigger links to each other with the output terminal of described comparer, and the input end of described counter links to each other with the output terminal of described trigger, and described detecting device links to each other with the output terminal of described counter.
3. capacitive detection circuit as claimed in claim 2, it is characterized in that, described charging module comprises first switch and the first power supply VCC1, and described first switch is connected between the other end of the first power supply VCC1 and described testing capacitance, and first switch is electrically connected described clock signal output module.
4. capacitive detection circuit as claimed in claim 2 is characterized in that, described electric charge shift module comprises the transfer electric capacity in parallel with described first electric capacity, second switch, reaches the 3rd switch;
One end ground connection of described transfer electric capacity, the other end that shifts electric capacity connects an end of second switch and an end of the 3rd switch simultaneously, and the other end of electric capacity, an end of described first electric capacity of another termination of the 3rd switch are surveyed in the other end reception of second switch.
5. capacitive detection circuit as claimed in claim 4, it is characterized in that, described charge-discharge modules comprises second source VCC2, the 4th switch, reaches the 5th switch, and the 5th switch in parallel is in the two ends of described transfer electric capacity, and second source VCC2 connects the other end of described transfer electric capacity by the 4th switch.
6. capacitive detection circuit as claimed in claim 5 is characterized in that, described charge-discharge modules also comprises the 6th switch that is parallel to the first electric capacity two ends.
7. capacitive detection circuit as claimed in claim 2 is characterized in that, described processor also comprises the selector switch of controlling described charge-discharge modules according to the comparative result of described comparer, and described selector switch is connected between described comparer and the 4th switch.
8. capacitive detection circuit as claimed in claim 7 is characterized in that, described selector switch is rejection gate, and the first input end of described rejection gate links to each other with the output terminal of described trigger, and second input end of described rejection gate is connected with described clock signal output module.
9. capacitive detection circuit as claimed in claim 6 is characterized in that, described processor also comprises the selector switch of controlling described charge-discharge modules according to the comparative result of described comparer, and described selector switch is connected between described comparer and the 4th switch.
10. capacitive detection circuit as claimed in claim 2 is characterized in that, described trigger is d type flip flop.
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| CN 201320050626 CN203117298U (en) | 2013-01-30 | 2013-01-30 | Capacitance detection circuit |
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| CN 201320050626 CN203117298U (en) | 2013-01-30 | 2013-01-30 | Capacitance detection circuit |
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| CN104794433A (en) * | 2015-03-27 | 2015-07-22 | 深圳市汇顶科技股份有限公司 | Fingerprint recognition system and fingerprint recognition method |
| CN105911362A (en) * | 2016-04-22 | 2016-08-31 | 福州福大海矽微电子有限公司 | Weak capacitance detection circuit based on capacitance phase shift effect and weak capacitance detection method thereof |
| CN106990296A (en) * | 2017-05-07 | 2017-07-28 | 长沙方星腾电子科技有限公司 | A kind of capacitive detection circuit |
| CN107003347A (en) * | 2015-10-23 | 2017-08-01 | 深圳市汇顶科技股份有限公司 | Capacitive detection sensor and its relevant apparatus and system |
| CN107167664A (en) * | 2017-05-07 | 2017-09-15 | 长沙方星腾电子科技有限公司 | A kind of capacitive detection circuit |
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| CN111819451A (en) * | 2020-03-03 | 2020-10-23 | 深圳市汇顶科技股份有限公司 | Capacitance detection circuit, sensor, chip, and electronic device |
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| CN107003347A (en) * | 2015-10-23 | 2017-08-01 | 深圳市汇顶科技股份有限公司 | Capacitive detection sensor and its relevant apparatus and system |
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| CN105911362A (en) * | 2016-04-22 | 2016-08-31 | 福州福大海矽微电子有限公司 | Weak capacitance detection circuit based on capacitance phase shift effect and weak capacitance detection method thereof |
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| CN107167664A (en) * | 2017-05-07 | 2017-09-15 | 长沙方星腾电子科技有限公司 | A kind of capacitive detection circuit |
| CN107247190A (en) * | 2017-05-24 | 2017-10-13 | 欧常春 | A kind of capacitive detection circuit of utilization electric charge zoom technology |
| CN107247190B (en) * | 2017-05-24 | 2019-09-10 | 欧常春 | A kind of capacitive detection circuit using charge zoom technology |
| CN110275047A (en) * | 2018-03-14 | 2019-09-24 | 京东方科技集团股份有限公司 | Acceleration transducer, capacitive detection circuit, acceleration processing circuit and method |
| CN111164557A (en) * | 2018-09-07 | 2020-05-15 | 深圳市汇顶科技股份有限公司 | Capacitance detection circuit, touch chip and electronic equipment |
| CN111164557B (en) * | 2018-09-07 | 2023-10-20 | 深圳市汇顶科技股份有限公司 | Capacitance detection circuit, touch chip and electronic equipment |
| CN110504970A (en) * | 2019-08-22 | 2019-11-26 | 湖南品腾电子科技有限公司 | Capacitor digital conversion circuit |
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| CN111651085B (en) * | 2020-06-01 | 2022-09-27 | 上海爱信诺航芯电子科技有限公司 | Self-capacitance detection scanning circuit |
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| CN113702851A (en) * | 2021-08-30 | 2021-11-26 | 傲普(上海)新能源有限公司 | Battery voltage sampling time sequence automatic control system |
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