CN115951800B - Capacitive touch waterproof system processed through pressure sensing technology - Google Patents
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- CN115951800B CN115951800B CN202310224002.8A CN202310224002A CN115951800B CN 115951800 B CN115951800 B CN 115951800B CN 202310224002 A CN202310224002 A CN 202310224002A CN 115951800 B CN115951800 B CN 115951800B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/40—Controlling or monitoring, e.g. of flood or hurricane; Forecasting, e.g. risk assessment or mapping
Abstract
The invention discloses a capacitive touch waterproof system processed by a pressure sensing technology, which comprises: the system comprises a pressure sensor, a signal conditioning module, an equivalent model simulation unit, a peripheral processing circuit and an SOC processing unit; the pressure sensor has two output ends: vp1 and Vn1, both coupled to the signal conditioning module; the pressure sensor accurately converts the deformation signal into an electric signal, and sends the electric signal into the signal conditioning module for processing; the signal conditioning module comprises a programmable gain amplification module 1, a programmable gain amplification module 2, a successive approximation converter SARADC and an IDAC compensation circuit which are connected in cascade; the invention realizes the waterproof level of IPX5 and meets the waterproof requirement of the vehicle standard level.
Description
Technical Field
The invention relates to the technical field of pressure sensing, in particular to a capacitive touch waterproof system processed by the pressure sensing technology.
Background
The traditional capacitive touch chip is generally used for treating the waterproof problem in a mode of shielding electrodes, and is a main implementation mode for realizing waterproof of the capacitive touch at present.
The key point of the processing mode is that the existence of moisture can be accurately detected in the chip, an accurate and reliable model needs to be established to identify the scene, but the components of the water are complex, sweat with more salt content and rainwater with higher acidity can be possibly contained, or sewage doped with various chemical components, the model established by a chip hardware logic circuit is difficult to achieve hundred percent accuracy, and the waterproof test of the traditional scheme of pure touch can only reach the waterproof level of IPX 2;
the prior art can not meet the demands of people at present, and based on the present situation, the prior art needs to be improved.
Disclosure of Invention
The present invention is directed to a capacitive touch waterproof system that solves the above-mentioned problems with the background art by using a pressure sensing technology.
The invention provides a capacitive touch waterproof system processed by a pressure sensing technology, which comprises a pressure sensor, a signal conditioning module, an equivalent model simulation unit, a peripheral processing circuit and an SOC processing unit, wherein the pressure sensor is connected with the signal conditioning module;
the pressure sensor has two output ends: vp1 and Vn1, each of the Vp1 and Vn1 coupled to the signal conditioning module; the pressure sensor accurately converts the deformation signal into an electric signal, and sends the electric signal into the signal conditioning module for processing;
the signal conditioning module comprises a programmable gain amplification module 1, a programmable gain amplification module 2 and a successive approximation converter: SARADC and IDAC compensation circuits;
the programmable gain amplification module 1 comprises: the amplifier U1, the amplifier U2, the resistor R1, the resistor R2, the resistor R3 and the resistor R4 are connected in series to form a resistor series circuit;
the positive input ends of the amplifier U1 and the amplifier U2 in the programmable gain amplification module 1 are sequentially coupled with two paths of output ends Vp1 and Vn1 of the pressure sensor, the output ends of the amplifier U1 and the amplifier U2 are used as two paths of output ends of the programmable gain amplification module 1 to be coupled with two paths of input ends of the programmable gain amplification module 2, and the two paths of output ends of the programmable gain amplification module 2 are coupled with two paths of input ends of SARADC; the output end of the SARADC is loaded to the SOC processing unit;
the SOC processing unit includes: the touch system comprises a force mapping unit, a user modeling configuration unit, a touch SOC processing unit and a waterproof logic unit; the output ends of the force mapping unit, the user modeling configuration unit and the touch SOC processing unit are all loaded to the waterproof logic unit;
the SOC processing unit is provided with a feedback output end, and the feedback output end is coupled to the reverse input end of the programmable gain amplifying module 1 through an IDAC compensation circuit;
the equivalent model simulation unit includes: a water drop equivalent model simulation unit, a water curtain equivalent model simulation unit, a flushing equivalent model simulation unit, a storm equivalent model simulation unit and a flooding equivalent model simulation unit; and the output end of the equivalent model simulation unit is loaded to the SOC processing unit through the peripheral processing circuit.
The invention has the following beneficial effects:
the deformation signals are accurately converted into electric signals through the pressure sensor, the electric signals are sent into the signal conditioning module, the signals in the signal conditioning module are sent into the SOC processing unit after being conditioned by the signals of the programmable gain amplifying module 1, the programmable gain amplifying module 2, the successive approximation converter SARADC and the IDAC compensation circuit, and the water drop equivalent model simulation unit, the water curtain equivalent model simulation unit, the flushing equivalent model simulation unit, the storm equivalent model simulation unit, the flooding equivalent model simulation unit and other effective models can be processed through arranging various algorithms in the SOC processing unit, so that the waterproof level of the IPX5 is realized, and the requirement of vehicle-scale waterproof is met.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present invention;
fig. 2 is a schematic diagram of an IDAC compensation circuit according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the present invention without making any inventive effort fall within the scope of the present invention.
Referring to fig. 1, the invention provides a capacitive touch waterproof system processed by a pressure sensing technology, which comprises a pressure sensor, a signal conditioning module, an equivalent model simulation unit, a peripheral processing circuit and an SOC processing unit.
The pressure sensor has two output ends: vp1 and Vn1, each of the Vp1 and Vn1 coupled to the signal conditioning module; the pressure sensor accurately converts the deformation signal into an electric signal, and sends the electric signal into the signal conditioning module for processing,
the signal conditioning module comprises a programmable gain amplification module 1, a programmable gain amplification module 2, a successive approximation converter SARADC and an IDAC compensation circuit which are connected in cascade; the programmable gain amplification module 1 comprises: the amplifier comprises an amplifier U1, an amplifier U2, a resistor R1, a resistor R2, a resistor R3 and a resistor R4, wherein the resistor R1, the resistor R2, the resistor R3 and the resistor R4 are connected in series to form a resistor series circuit, two ends of the resistor series circuit are respectively connected to the output ends of the amplifier U1 and the amplifier U2 in parallel, a compensation point A is arranged between the resistor R1 and the resistor R2, and another compensation point B is arranged between the resistor R3 and the resistor R4; the positive input ends of the amplifier U1 and the amplifier U2 in the programmable gain amplification module 1 are sequentially coupled with two paths of output ends Vp1 and Vn1 of the pressure sensor, the output ends of the amplifier U1 and the amplifier U2 are used as two paths of output ends of the programmable gain amplification module 1 to be coupled with two paths of input ends of the programmable gain amplification module 2, and the two paths of output ends of the programmable gain amplification module 2 are coupled with two paths of input ends of SARADC; the output end of the SARADC is loaded to the SOC processing unit.
The SOC processing unit includes: the touch system comprises a force mapping unit, a user modeling configuration unit, a touch SOC processing unit and a waterproof logic unit; the output ends of the force mapping unit, the user modeling configuration unit and the touch SOC processing unit are all loaded to the waterproof logic unit; the signal processed by the signal conditioning module is output to the SOC processing unit, the SOC processing unit firstly carries out mapping processing of the pressure sensing signal and the force through the force mapping unit, then carries out custom configuration processing according to a user through the user modeling configuration unit, finally outputs the processed signal to the waterproof logic unit for carrying out pattern algorithm matching after being processed by the touch SOC processing unit, and finally gives a correct logic judgment result.
The SOC processing unit is provided with a feedback output end, and the feedback output end is coupled to the reverse input end of the programmable gain amplifying module 1 through an IDAC compensation circuit;
referring to fig. 2, the IDAC compensation circuit includes: the current-type digital-to-analog converter IDAC and the switches K1 and K2 generate a calibration signal, and the calibration signal is a current signal, and the calibration signal can be added to the compensation point a or B through one of the switches K1 or K2. The closing or opening of K1 and K2 is controlled by a software unit and only one switch is closed during compensation, i.e. the compensation current can only be applied to one of the compensation points a or B.
The present invention provides an embodiment for describing an operation mechanism of an IDAC compensation circuit, wherein the resistance values of a resistor R1 and a resistor R4 in a programmable gain amplification module 1 are the same, and the resistance values of a resistor R2 and a resistor R3 are the same, so that the resistors R1 and R2 are uniformly adopted for calculation in the following calculation.
In the embodiment, the voltage vo+ at the output end of the amplifier U1 is equal to the voltage Vo-at the output end of the amplifier U2 by controlling the magnitude of the compensation current; i.e.
V 0 +=V 0 -
The required current calculation formula is:
wherein, the current flowing through A-vo+ is:
the current through A-B-Vo-is:
considering that the programmable gain amplification module 1 and the programmable gain amplification module 2 are both single-ended power supplies, the vo+ point voltage should be higher than 0; so that the number of the parts to be processed,
the maximum adjustment range is determined by the input common mode voltage Vi, the programmable Gain amplification module 1, and the Gain 1.
The equivalent model simulation unit includes: a water drop equivalent model simulation unit, a water curtain equivalent model simulation unit, a flushing equivalent model simulation unit, a storm equivalent model simulation unit and a flooding equivalent model simulation unit; and the output end of the equivalent model simulation unit is loaded to the SOC processing unit through the peripheral processing circuit.
The peripheral processing circuit includes: equivalent resistance, equivalent capacitance, capacitive touch electrode, parasitic capacitance and series resistance; one output end of the equivalent model simulation unit is commonly connected with the SOC processing unit through an equivalent capacitor, and the other output end of the equivalent model simulation unit is loaded to the touch SOC processing unit of the SOC processing unit through sequentially and serially coupling an equivalent resistor, a capacitive touch electrode and a serial resistor; parasitic capacitance is connected in parallel between the capacitive touch electrode and the equivalent capacitance; the equivalent capacitor is used for reflecting the size of the water flow, and the equivalent resistor is used for measuring the resistance characteristic of the water flow; the capacitive touch electrode is used for collecting signals when pressed by hands; the parasitic capacitance is used for measuring the capacitance characteristic presented by the capacitive touch electrode; the series resistance is used to increase the immunity of the system.
In an embodiment, when there is a flushing or car washing action, the pressure sensor detects the existence of a force with a certain magnitude, for example, in the range of 1 to 10 newtons, and the signal conditioning module is provided with two stages of programmable gain amplification modules (the programmable gain amplification module 1 and the programmable gain amplification module 2) so as to enlarge the dynamic measurement range of the signal conditioning module: when the programmable gain amplification module 1 and the programmable gain amplification module 2 are not enabled, the measurable signals are larger, the measurable signals after the programmable gain amplification module 1 and the programmable gain amplification module 2 are enabled can be very small, deformation of the pressure sensor in the range of 0-1.1 micrometers can be detected, and corresponding electric signals can be accurately acquired from the uV level to the mV level; in addition, for the signals exceeding the dynamic range, the original pressure sensor signals can be corrected in a current compensation mode through the IDAC compensation circuit, so that the range of the signals to be measured is pulled back to the normal working range of the signal conditioning module, and the magnitude of the applied force on the pressure sensor is accurately restored.
The waterproof logic unit performs algorithm processing on the input signals through a force numerical value filtering algorithm, a window sliding filtering algorithm and a waterproof model feature matching algorithm to achieve a waterproof effect, wherein input factors of the waterproof model feature value matching algorithm comprise: the original data of capacitive touch, the magnitude of force corresponding to pressure feeling and the configuration input by a user through a register are different for 5 different equivalent models, and the characteristic factors of the waterproof model are analyzed as follows:
in an embodiment, the change of the capacitive touch is a major consideration for the water drop equivalent model, which causes the change of the capacitive touch, but the change of the capacitive touch is much smaller than the change of the capacitance caused by the normal human touch, and the pressure of the pressure sensor changes almost to 0 in this model.
In the embodiment, for the water curtain equivalent model, the characteristics are similar to those of the water drop equivalent model, and the difference is that a plurality of capacitive touch electrodes change at the same time, and one capacitive touch change can be seen from a channel corresponding to the capacitive touch electrode, and the pressure change of the pressure sensor of the model is almost 0.
In an embodiment, for a flush equivalent model, as in car wash mode, there is a change in both capacitive touch and pressure sensor pressure, the change in capacitive touch being greater than both water curtain equivalent model and water droplet equivalent model, but still less than the change caused by human touch, the pressure sensor pressure will detect the presence of force, ranging from 1 newton to 10 newtons.
In the embodiment, for the storm equivalent model, the method is similar to a flushing mode, but features in one direction are different, flushing is a selection angle which can be almost 360 degrees from all directions without dead angles, the storm mode basically fluctuates within 30 degrees up and down in the vertical direction, and the storm mode can be accurately judged through the triggered sequential time features of a plurality of touch electrodes and pressure sensors.
In an embodiment, for the flooding equivalent model, after the flooding equivalent model is used for simulating the flooding, the signal conditioning module needs to be able to correctly identify the scene of the flooding equivalent model, the capacitive touch is always maintained on a constant reference, the reference is higher than that in the case of no water, and the pressure sensor can normally detect the pressing action of the user.
In the embodiment, the waterproof test of the traditional scheme using pure touch can only reach the waterproof level of IPX2, and the waterproof level of IPX5 can be achieved by using the method of the invention, thereby meeting the requirement of vehicle-standard waterproof.
Although the present invention has been described with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements and changes may be made without departing from the spirit and principles of the present invention.
Claims (10)
1. A capacitive touch waterproof system processed by a pressure sensing technique, comprising:
a pressure sensor having two outputs: vp1 and Vn1, wherein Vp1 and Vn1 are both coupled to the signal conditioning module, and the pressure sensor converts the deformation signal into an electrical signal and sends the electrical signal into the signal conditioning module for processing;
a signal conditioning module, comprising: the device comprises a programmable gain amplification module 1, a programmable gain amplification module 2, a successive approximation converter SARADC and an IDAC compensation circuit; the output end of the programmable gain amplification module 1 is coupled with the programmable gain amplification module 2, the output end of the programmable gain amplification module 2 is coupled with the successive approximation converter SARADC, and the output end of the successive approximation converter SARADC is loaded to the SOC processing unit;
an SOC processing unit including: the touch system comprises a force mapping unit, a user modeling configuration unit, a touch SOC processing unit and a waterproof logic unit; the output ends of the force mapping unit, the user modeling configuration unit and the touch SOC processing unit are all loaded to the waterproof logic unit, the SOC processing unit is provided with a feedback output end, and the feedback output end is coupled to the reverse input end of the programmable gain amplification module 1 through an IDAC compensation circuit;
an equivalent model simulation unit comprising: a water drop equivalent model simulation unit, a water curtain equivalent model simulation unit, a flushing equivalent model simulation unit, a storm equivalent model simulation unit and a flooding equivalent model simulation unit; the output end of the equivalent model simulation unit is loaded to the SOC processing unit through the peripheral processing circuit;
when the flushing action exists, the pressure sensor detects the existence of force, and the programmable gain amplification module 1 and the programmable gain amplification module 2 enlarge the dynamic measurement range of the signal conditioning module; for signals exceeding the dynamic range, correcting the original pressure sensor signals in a current compensation mode through an IDAC compensation circuit, so that the range of the signals to be measured is pulled back to a normal working range of the signal conditioning module, and the magnitude of the force applied to the pressure sensor is restored;
the waterproof logic unit performs algorithm processing on an input signal through a force numerical filtering algorithm, a window sliding filtering algorithm and a waterproof model characteristic matching algorithm, wherein input factors of the waterproof model characteristic value matching algorithm comprise: the original data of the capacitive touch, the magnitude of the force corresponding to the pressure sense and the configuration input by the user through the register are different for different equivalent models, and the characteristic factors of the waterproof model are different.
2. The capacitive touch waterproof system processed by a pressure sensing technique according to claim 1, wherein: the programmable gain amplification module 1 comprises an amplifier U1, an amplifier U2, a resistor R1, a resistor R2, a resistor R3 and a resistor R4, wherein the resistor R1, the resistor R2, the resistor R3 and the resistor R4 are connected in series to form a resistor series circuit, and two ends of the resistor series circuit are respectively connected to the output ends of the amplifier U1 and the amplifier U2 in parallel.
3. The capacitive touch waterproof system processed by a pressure sensing technique according to claim 2, wherein: the resistance of the resistor R1 is the same as that of the resistor R4, the resistance of the resistor R2 is the same as that of the resistor R3, a compensation point A is arranged between the resistor R1 and the resistor R2, another compensation point B is arranged between the resistor R3 and the resistor R4, and compensation current is loaded to one of the compensation points A or B.
4. The capacitive touch waterproof system processed by a pressure sensing technique according to claim 2, wherein:
the positive input ends of the amplifier U1 and the amplifier U2 in the programmable gain amplification module 1 are sequentially coupled to the two output ends Vp1 and Vn1 of the pressure sensor, and the output ends of the amplifier U1 and the amplifier U2 are used as the two output ends of the programmable gain amplification module 1 to be coupled to the two input ends of the programmable gain amplification module 2.
5. The capacitive touch waterproof system processed by a pressure sensing technique according to claim 1, wherein:
the IDAC compensation circuit includes: current-mode digital-to-analog converter IDAC, switches K1 and K2;
the current-type digital-to-analog converter IDAC generates a calibration signal, which is a current signal, the closing or opening of the switches K1 and K2 is controlled by a software unit, and only one switch is closed during compensation.
6. The capacitive touch waterproof system processed by a pressure sensing technique according to claim 1, wherein:
the peripheral processing circuit comprises an equivalent resistor, an equivalent capacitor, a capacitive touch electrode, a parasitic capacitor and a series resistor;
one output end of the equivalent model simulation unit is commonly connected with the SOC processing unit through an equivalent capacitor, and the other output end of the equivalent model simulation unit is sequentially and serially coupled with an equivalent resistor, a capacitive touch electrode and a series resistor to be loaded to the touch SOC processing unit of the SOC processing unit;
parasitic capacitance is connected in parallel between the capacitive touch electrode and the equivalent capacitance.
7. The capacitive touch waterproof system processed by a pressure sensing technique according to claim 6, wherein: the equivalent capacitor is used for reflecting the size of water flow; the equivalent resistor is used for measuring the resistance characteristic of water flow; the capacitive touch electrode is used for collecting signals when pressed by hands; the parasitic capacitance is used for measuring capacitance characteristics presented by the capacitive touch electrode; the series resistance is used to increase the immunity of the system.
8. The capacitive touch waterproof system processed by a pressure sensing technique according to claim 2, wherein: the voltage of the output end of the amplifier U1 is equal to the voltage of the output end of the amplifier U2.
9. The capacitive touch waterproof system processed by a pressure sensing technique according to claim 2, wherein: the programmable gain amplification module 1 and the programmable gain amplification module 2 are both single-ended power supply, and the voltage of the output end of the amplifier U1 is larger than 0.
10. The capacitive touch waterproof system processed by a pressure sensing technique according to claim 1, wherein: the force mapping unit is used for mapping the pressure sensing signal and the force; the user modeling configuration unit is used for customizing configuration processing of a user; the touch SOC processing unit is used for outputting the signals processed by the user modeling configuration unit into the waterproof logic unit for pattern algorithm matching.
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