CN115951800A - Waterproof system for processing capacitive touch through pressure sensing technology - Google Patents
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- CN115951800A CN115951800A CN202310224002.8A CN202310224002A CN115951800A CN 115951800 A CN115951800 A CN 115951800A CN 202310224002 A CN202310224002 A CN 202310224002A CN 115951800 A CN115951800 A CN 115951800A
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Abstract
The invention discloses a waterproof system for processing capacitive touch through 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 the electric signal is sent into a signal conditioning module to be processed; 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 a cascade manner; the invention realizes the waterproof grade of IPX5 and meets the requirement of vehicle specification waterproof.
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
Traditional electric capacity touch chip handles waterproof problem usually to the mode that uses shielding electrode, also is present electric capacity touch and realizes waterproof main implementation mode, and the leading principle is when there is rivers or water droplet in the touch surface, detects the existence of moisture through inside pressure sensor, forbids the detection scanning of falling the inside other electric capacity pressure sensor of chip to avoid gathering the data under water and the human hand combined action, lead to algorithm logic judgement mistake, arouse the mistake to touch.
The key of the processing mode is that the existence of water can be accurately detected in the chip, an accurate and reliable model needs to be established to identify the scene, but the components of water are complex, sweat with more salt content and rainwater with larger acidity or sewage doped with various chemical components, the model established by a chip hardware logic circuit is difficult to achieve one hundred percent of accuracy, and the waterproof test of the pure-touch traditional scheme can only achieve the waterproof level of IPX 2;
the prior art can not meet the requirements of people at the present stage, and the prior art is urgently needed to be reformed based on the current situation.
Disclosure of Invention
The present invention is directed to a waterproof system for capacitive touch processing by pressure sensing technology, so as to solve the problems mentioned in the background art.
The invention provides a capacitive touch waterproof system processed by a pressure-sensitive technology, which comprises a pressure-sensitive sensor, a signal conditioning module, an equivalent model simulation unit, a peripheral processing circuit and an SOC processing unit, wherein the signal conditioning module is used for conditioning signals;
the pressure sensor has two output ends: vp1 and Vn1, said Vp1 and Vn1 are both coupled to a signal conditioning module; the pressure sensor accurately converts the deformation signal into an electric signal, and sends the electric signal into a 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: sar adc and IDAC compensation circuits;
the programmable gain amplification module 1 comprises: the circuit 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;
the positive direction input ends of an amplifier U1 and an amplifier U2 in the programmable gain amplification module 1 are sequentially coupled with two paths of output ends Vp1 and Vn1 of the pressure-sensitive 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 two paths of output ends of the programmable gain amplification module 2 are coupled with two paths of input ends of the SARADC; the output end of the SARADC is loaded to an SOC processing unit;
the SOC processing unit includes: the 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 which is coupled to the reverse input end of the programmable gain amplification module 1 through an IDAC compensation circuit;
the equivalent model simulation unit includes: the system comprises a water drop equivalent model simulation unit, a water curtain equivalent model simulation unit, a flushing equivalent model simulation unit, a rainstorm 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 a peripheral processing circuit.
The invention has the following beneficial effects:
the invention accurately converts the deformation signal into the electric signal through the pressure sensor, and sends the electric signal into the signal conditioning module, the signal in the signal conditioning module is conditioned through the signals of the programmable gain amplification module 1, the programmable gain amplification module 2, the successive approximation converter SARADC and the IDAC compensation circuit and then sent into the SOC processing unit, and through arranging a plurality of algorithms in the SOC processing unit, equivalent models such as a water drop equivalent model simulation unit, a water curtain equivalent model simulation unit, a flushing equivalent model simulation unit, a rainstorm equivalent model simulation unit and a flooding equivalent model simulation unit can be processed, thereby realizing the waterproof level of IPX5 and meeting the requirement of vehicle-level waterproof.
Drawings
FIG. 1 is a schematic view 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 technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the invention without making any creative effort, shall fall within the protection scope of the 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, said Vp1 and Vn1 are both coupled to a signal conditioning module; the pressure sensor accurately converts the deformation signal into an electric signal, and sends the electric signal into a 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 circuit 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 direction input ends of an amplifier U1 and an amplifier U2 in the programmable gain amplification module 1 are sequentially coupled with two paths of output ends Vp1 and Vn1 of the pressure-sensitive 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 two paths of output ends of the programmable gain amplification module 2 are coupled with two paths of input ends of the SARADC; and the output end of the SARADC is loaded to the SOC processing unit.
The SOC processing unit includes: the 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 performs mapping processing of the magnitude of the pressure sensing signal and the force through the force mapping unit, then performs customized configuration processing according to a user through the user modeling configuration unit, finally outputs the signal to the waterproof logic unit for mode algorithm matching after being processed by the touch SOC processing unit, and finally provides a correct logic judgment result.
The SOC processing unit is provided with a feedback output end which is coupled to the reverse input end of the programmable gain amplification module 1 through an IDAC compensation circuit;
referring to fig. 2, the IDAC compensation circuit includes: the current-mode digital-to-analog converter IDAC generates 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 explaining the working mechanism of the IDAC compensation circuit, wherein the resistances of the resistor R1 and the resistor R4 in the programmable gain amplification module 1 are the same, and the resistances of the resistor R2 and the resistor R3 are the same, so that the following calculation is performed by uniformly using the resistors R1 and R2.
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; namely, it is
V 0 +=V 0 -
The required current calculation formula is as follows:
wherein, the current flowing through A-Vo + is:
the current flowing 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 voltage of the Vo + point is higher than 0; therefore, the first and second electrodes are formed on the substrate,
the maximum adjustment range is determined by the input common-mode voltage Vi, and the Gain1 of the programmable Gain amplification module 1.
The equivalent model simulation unit includes: the system comprises a water drop equivalent model simulation unit, a water curtain equivalent model simulation unit, a flushing equivalent model simulation unit, a rainstorm 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 a 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 connected with the SOC processing unit through an equivalent capacitor in a common ground manner, 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 coupling an equivalent resistor, a capacitor touch electrode and a series resistor in series; a parasitic capacitor is connected in parallel between the capacitive touch electrode and the equivalent capacitor; the equivalent capacitor is used for reflecting the size of water flow, and the equivalent resistor is used for measuring the resistance characteristic presented by the water flow; the capacitive touch electrode is used for collecting signals when a human hand presses; the parasitic capacitance is used for measuring the capacitance characteristic presented by the capacitance touch electrode; the series resistance is used to increase the noise immunity of the system.
In an embodiment, when there is a flushing or car washing action, the pressure sensor detects the existence of a certain amount of force, for example, a range of 1 to 10 newtons, and the signal conditioning module is provided with two-stage programmable gain amplification modules (programmable gain amplification module 1 and programmable gain amplification module 2) to increase the dynamic measurement range of the signal conditioning module: namely, when the programmable gain amplification module 1 and the programmable gain amplification module 2 are not enabled, the measurable signal is larger, and the measurable signal after the programmable gain amplification module 1 and the programmable gain amplification module 2 are enabled can be very small, so that the deformation quantity of the pressure sensor in the range of 0 to 1.1 micrometers can be detected, and the corresponding electric signals can be accurately collected from the uV level to the mV level; in addition, for signals beyond the dynamic range, the IDAC compensation circuit can correct the original pressure sensor signals in a current compensation mode, 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 force applied to the pressure sensor is accurately reduced.
The waterproof logic unit achieves the waterproof effect after carrying out algorithm processing on input signals 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 capacitive touch, the magnitude of the force corresponding to pressure and the configuration input by a user through a register are different from 5 different equivalent models in terms of characteristic factors of a waterproof model, and the specific analysis is as follows:
in the embodiment, the change of the capacitive touch is a main consideration factor for a water droplet 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 to almost 0 in the model.
In the embodiment, for the water curtain equivalent model, the characteristics are similar to those of the water drop equivalent model, except that a plurality of capacitive touch electrodes are changed simultaneously, the change of one capacitive touch can be seen from the channel corresponding to the capacitive touch electrode, and the pressure change of the pressure sensor of the model is almost 0.
In an embodiment, as for the flushing equivalent model, as in the car washing mode, there is a change in both the capacitive touch and the pressure of the pressure sensor, where the change in the capacitive touch is greater than that of the water curtain equivalent model and the water drop equivalent model, but still smaller than the change caused by the human touch, and the pressure of the pressure sensor detects the existence of a force, which ranges from 1 n to 10 n.
In the embodiment, for the rainstorm equivalent model, similar to the flushing mode, but different in characteristics in one direction, the flushing is a selection angle which can be almost 360 degrees without dead angles from all directions, the rainstorm mode basically fluctuates within 30 degrees up and down in the vertical direction, and the rainstorm mode can be accurately judged through the triggered time characteristics of the touch electrodes and the pressure sensor.
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 recognize the scene of the flooding equivalent model, the capacitive touch is always maintained on a constant reference, which 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 pure-touch scheme can only reach the waterproof level of IPX2, and the waterproof level of IPX5 can be achieved by using the method disclosed by the invention, so that the requirement of vehicle-scale waterproof is met.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (10)
1. A waterproof system for processing capacitive touch through pressure sensing technology, comprising:
a pressure sensor having two output terminals: vp1 and Vn1, wherein Vp1 and Vn1 are both coupled to the signal conditioning module, the pressure sensor converts the deformation signal into an electric signal, and the electric signal is sent to the signal conditioning module for processing;
a signal conditioning module comprising: the system 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 to the programmable gain amplification module 2, the output end of the programmable gain amplification module 2 is coupled to 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, comprising: the 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 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: the system comprises a water drop equivalent model simulation unit, a water curtain equivalent model simulation unit, a flushing equivalent model simulation unit, a rainstorm 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 a peripheral processing circuit.
2. The waterproof system for capacitive touch processing by pressure sensitive technology of 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 waterproof system for capacitive touch processing by pressure sensitive technology of claim 2, wherein: the resistance values of the resistor R1 and the resistor R4 are the same, the resistance values of the resistor R2 and the resistor R3 are the same, 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 waterproof system for capacitive touch processing by pressure sensitive technology of claim 2, wherein:
the positive input ends of an amplifier U1 and an amplifier U2 in the programmable gain amplification module 1 are sequentially coupled to 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 two output ends of the programmable gain amplification module 1 to be coupled to two input ends of the programmable gain amplification module 2.
5. The waterproof system for capacitive touch processing by pressure sensitive technology of claim 1, wherein:
the IDAC compensation circuit includes: a 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 on or off of the switches K1 and K2 is controlled by a software unit, and only one switch is closed during compensation.
6. The waterproof system for capacitive touch processing by pressure sensitive technology of 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 connected with the SOC processing unit through an equivalent capacitor in a common ground mode, and the other output end of the equivalent model simulation unit is sequentially coupled with an equivalent resistor, a capacitor touch electrode and a series resistor in series and loaded to the touch SOC processing unit of the SOC processing unit;
and a parasitic capacitor is connected in parallel between the capacitive touch electrode and the equivalent capacitor.
7. The waterproof system of claim 6, wherein: the equivalent capacitor is used for reflecting the size of water flow; the equivalent resistance is used for measuring the resistance characteristic presented by the water flow; the capacitive touch electrode is used for collecting signals when a human hand presses; the parasitic capacitance is used for measuring capacitance characteristics presented by the capacitance touch electrode; the series resistance is used to increase the noise immunity of the system.
8. The waterproof system for capacitive touch processing by pressure sensitive technology of 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 waterproof system for capacitive touch processing by pressure sensitive technology of claim 2, wherein: the programmable gain amplification module 1 and the programmable gain amplification module 2 are both single-ended power supplies, and the voltage of the output end of the amplifier U1 is greater than 0.
10. The waterproof system for capacitive touch processing by pressure sensitive technology of 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 the customized configuration processing of a user; and 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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