CN107817901A - A kind of computer keyboard waterproof electronic control system - Google Patents
A kind of computer keyboard waterproof electronic control system Download PDFInfo
- Publication number
- CN107817901A CN107817901A CN201711044071.1A CN201711044071A CN107817901A CN 107817901 A CN107817901 A CN 107817901A CN 201711044071 A CN201711044071 A CN 201711044071A CN 107817901 A CN107817901 A CN 107817901A
- Authority
- CN
- China
- Prior art keywords
- controller
- line
- humidity
- frequency
- task
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/02—Input arrangements using manually operated switches, e.g. using keyboards or dials
- G06F3/0202—Constructional details or processes of manufacture of the input device
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/30—Monitoring
- G06F11/3058—Monitoring arrangements for monitoring environmental properties or parameters of the computing system or of the computing system component, e.g. monitoring of power, currents, temperature, humidity, position, vibrations
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/12—Coupling devices having more than two ports
- H01P5/16—Conjugate devices, i.e. devices having at least one port decoupled from one other port
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Human Computer Interaction (AREA)
- Computing Systems (AREA)
- Quality & Reliability (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention belongs to field of computer technology, disclose a kind of computer keyboard waterproof electronic control system, including keyboard body, keyboard body includes shell and is screwed in the circuit board of enclosure, and the shell posterior height is more than front height, and shell rear interior has been screwed multiple small-sized fanses, controller is connected with below the circuit board, relay and loudspeaker, the circuit board surface are inlaid with multiple humidity sensors, and the outer casing bottom hollow out has multiple osculums.The present invention has waterproof alarm function, power-off protection can be carried out to circuit board again and wind dehumidifies.
Description
Technical Field
The invention belongs to the technical field of computers, and particularly relates to a waterproof electronic control system of a computer keyboard
Background
The keyboard is the most main input device of the computer, people can spill tea or beverage on the keyboard sometimes when working, if the keyboard is inverted, the keyboard fails, and if the keyboard is inverted, the computer hardware is damaged due to short circuit of a circuit board in the keyboard. The existing keyboard is only provided with the drain holes, people cannot be reminded of water inlet of the keyboard when not paying attention to the keyboard, and the keyboard does not have an automatic dehumidification function.
With the increasing development of wireless communication, various modern communication systems are rapidly developed. In order to meet the requirements of modern communication systems, small-sized, broadband, multi-passband passive devices have become the focus of research. In rf systems, couplers, such as power dividers, mixers, power combiners, and phase shifters, are widely embedded in electronic systems and become an important component of many microwave circuits.
According to research reports, the coupler is various and different from a structural point of view, and comprises: coaxial line type, waveguide type, microstrip line type, and stripline type. From the point of view of coupling mechanism, the coupling mechanism is mainly divided into four types, namely, small hole coupling, parallel coupling, branch line coupling and matching double T. In radio frequency systems, branch line couplers have received attention because they allow microwave circuits to be miniaturized while ensuring coupler performance.
At present, a series of research works are carried out on the coupler at home and abroad, and some achievements are achieved. However, the reported couplers generally suffer from the following drawbacks:
(1) The coupler is realized by adopting a cavity structure, so that the coupler is large in size and heavy in weight, and is inconvenient for system miniaturization and integration.
(2) Some couplers adopt a multilayer structure, and such couplers generally have the characteristics of wide bandwidth and high isolation, but the multilayer technology makes the processing and manufacturing extremely complicated.
(3) The coupler of the implementation mode has certain improvement in volume and weight compared with the traditional cavity structure coupler, but the size is still larger, and the performance cannot reach the optimum.
In order to solve the problem of the conventional coupler with a large size, some documents have proposed to load a lumped element between the microstrip lines between the input end and the output end of the branch line. According to "t.hirota; minakaw; in the analysis of M.Muraguchi, "Reduced-size bridge-line and rate-size hybrid for uniplanar MMIC's," IEEE trans. Microwave thermal Tech., vol. MTT-38, no.3, pp.270-275, mar.1990", the impedance of the microstrip line can be increased by loading the lumped capacitor element, and the length of the microstrip line is shortened to a certain extent in order to match the impedance of the input and output, thereby achieving the purpose of reducing the size. The disadvantage of this method is that the introduction of lumped elements simultaneously shifts the resonant frequency, reduces the operating bandwidth and degrades the performance of the coupler. According to "Ken-Min Lin; yen-Hsiu Wei; tzu-Hao Tseng; the Branch Line coupler is miniaturized by loading SIR branches, which reduces the size to a certain extent but does not achieve good effect, and the use of the SIR structure causes inflexibility of adjustment, and the size of Impedance cannot be adjusted arbitrarily to realize different frequency ratios of Dual bands.
In summary, the problems of the prior art are as follows: the keyboard can not remind people of water inlet, and the keyboard also has the function of automatic dehumidification;
the need of industrial application and integrated computer, especially computer, is urgent for a coupler with simple design, small insertion loss, good isolation and planar structure.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a waterproof electronic control system of a computer keyboard, wherein a coupler in the waterproof electronic control system changes the traditional micro-strip line structure of a main line and an auxiliary line, realizes miniaturization, solves the problems of resonance frequency shift or inflexible adjustment and the like caused by introducing lumped elements or using SIR structures in the prior miniaturization technology, and can realize different frequency ratios of double frequency bands by randomly adjusting the impedance.
The invention is realized in such a way that a computer keyboard waterproof electronic control system comprises a keyboard main body, wherein the keyboard main body comprises a shell and a circuit board fixed in the shell through screws, a plurality of small fans are fixed in the back side of the shell through screws, a controller, a relay and a loudspeaker are clamped below the circuit board, a plurality of humidity sensors are embedded on the surface of the circuit board, and a plurality of water drain holes are hollowed in the bottom of the shell.
Further, the height of the rear side of the housing is greater than the height of the front side.
Further, the circuit board is electrically connected with a controller through a relay, and the small fan and the loudspeaker are electrically connected with the controller.
The transfer function of the humidity sensor is:
wherein, ω is 0 For the center frequency of the filter, for different ω 0 K is k/ω 0 Keeping the same;
constructing a filter in a frequency domain, wherein the corresponding polar coordinate expression mode is as follows:
G(r,θ)＝G(r,r)·G(θ,θ)；
in the formula, G r (r) is the radial component controlling the filter bandwidth, G θ (θ) is the angular component controlling the filter direction;
r denotes the radial coordinate, theta denotes the angular coordinate, f 0 Is the center frequency, theta 0 Is the filter direction, σ f For determining a bandwidth;
Bf＝2(2/ln2)1/2|lnσ f |，σ θ determining an angular bandwidth, B θ =2 (2/ln 2) 1/2 σ θ ；
The controller analyzes the signals transmitted by the humidity sensor and then sends instructions to the small fans; the humidity signal analysis method of the controller comprises the following steps:
performing noise tracking on each frame of humidity signals in the humidity signals according to the following formula to obtain a noise spectrum N (w, N) of each frame of humidity signals:
wherein X (w, n) represents a short-time Fourier transform of the humidity signal; alpha u and alpha d are preset coefficients, and 0< alpha d < alpha u <1; w represents the frequency point sequence number on the frequency domain; n represents a frame number in the time domain;
and (3) carrying out binarization processing on the short-time Fourier transform of each frame of humidity signal according to the following formula to obtain a binary spectrum Xb (w, n):
tb is a preset first threshold value;
performing coherence matching between every two binary spectrums corresponding to the one path of humidity signal and the Kb binary spectrums corresponding to the other path of sound signal to obtain a first matching result, wherein the first matching result comprises matching positions and matching degrees corresponding to a group of binary spectrums with the highest matching degree, and both Ka and Kb are positive integers;
for each path of humidity signal, calculating the power spectrum P (w, n) of each frame of humidity signal in the sound signal according to the following formula:
P(w,n)＝α p P(w,n-1)+(1-α p )|X(w,n)| 2
wherein X (w, n) represents a short-time Fourier transform of the humidity signal;
alpha p is a preset coefficient, and alpha p is more than 0 and less than 1; w represents the frequency point sequence number on the frequency domain; n represents a frame number in the time domain;
calculating the inter-spectrum correlation DP (w, n) of the power spectrum of each frame of the humidity signal according to the following formula:
DP(w,n)＝|P(w+1,n)-P(w,n)|
and carrying out noise tracking on the inter-spectrum correlation DP (w, n) according to the following formula to obtain the inter-spectrum correlation NDP (w, n) of the noise power spectrum of each frame of humidity signal:
wherein, beta u and beta d are preset coefficients, and beta d is more than 0 and less than beta u and less than 1;
the coupler with a planar structure is integrated on the circuit board and comprises a main line and an auxiliary line which are symmetrical left and right, and the main line and the auxiliary line are both formed by microstrip lines loaded with open-circuit branches; the main line and the sub line are connected with the first branch line, the second branch line and the third branch line, the second branch line is formed by connecting two symmetrical microstrip lines in parallel and is connected at the position of one half of the length of the main line and the sub line;
the planar structured coupler further comprises: the metal floor is arranged on the bottom surface of the medium substrate;
the two ends of the main line are respectively provided with an input end and a first isolation port, and the two ends of the auxiliary line are respectively provided with a second isolation port and a coupling end;
the first branch line and the third branch line are respectively connected to two end parts of the main line and the secondary line, the first branch line is close to the input end and the second isolation port, and the third branch line is close to the first isolation port and the coupling end;
the main line, the auxiliary line, the first branch line, the second branch line, the third branch line, the input end, the first isolation port, the coupling end and the second isolation port are all printed on the dielectric substrate;
the dielectric substrate material is RT/duroid 5880, the relative dielectric constant is 2.2, the dielectric plate thickness is 0.787mm, the copper-clad thickness is 0.018mm, and the loss tangent is 0.0009;
the main line and the secondary line are formed by cascading two sections of quarter-wavelength transmission lines, each section of quarter-wavelength transmission line is formed by sequentially loading an equivalent structure of three open-circuit branches on two sections of transmission microstrip lines, and the middle open-circuit branches are shared in the cascading process to form the main line and the secondary line which are formed by loading an equivalent structure of five open-circuit branches on four sections of microstrip lines;
the equivalent process of the main line and the auxiliary line equivalent circuit is as follows:
the A parameter matrix of the quarter-wavelength transmission line is:
the A parameter matrix of the equivalent circuit is as follows:
while
Solving the above matrix, one can obtain:
wherein, theta 2 ＝90deg,θ 21 ＝22.5deg,θ 22 ＝45deg and Z 2 ＝35.35Ω。
Further, setting a humidity critical value;
judging a maximum processable load according to the humidity critical value;
combining a plurality of first work tasks into a first continuous work task according to the collection platform power management technology;
judging whether a load capacity of the first continuous work task is larger than the maximum processable load capacity;
when the load capacity of the first continuous working task is larger than the maximum processable load capacity, moving an overloaded part of the first working tasks in the first continuous working task out of the first continuous working task;
when receiving a first continuous working task, switching the controller from a sleep mode to an operation mode, and processing the first continuous working task; and setting the controller to be in a sleep mode after the first continuous work task is processed.
Further, the operation frequency of the controller has a normal operation frequency under a general operation, and the humidity control method of the controller further includes:
determining a first operating frequency according to the load of the first continuous work task and the temperature critical value;
when the controller is switched to the operation mode, the operation frequency of the controller is increased from the normal operation frequency to a first operation frequency, and the first continuous work task is processed through the first operation frequency;
wherein the first operating frequency has an operating frequency higher than an operating frequency of the normal operating frequency.
Further, the humidity control method of the controller further includes:
when the first continuous work task is processed and the controller enters a sleep mode, combining a plurality of second work tasks and the first work task of the overload part into a second continuous work task according to the power management technology of the convergence platform;
when a second continuous working task is received, the controller is switched from the sleep mode to the operation mode;
the operation frequency of the controller is increased from the normal operation frequency to a second operation frequency, and a second continuous work task is processed through the second operation frequency; and after the second continuous work task is processed, setting the controller into a sleep mode;
wherein the first operating frequency has an operating frequency higher than an operating frequency of the normal operating frequency.
Further, the controller has a first interval time between a time point when the first continuous work task is completed and a time point when the second continuous work task starts to be received using the first operating frequency, and has a second interval time between the time point when the first continuous work task is completed and the time point when the second continuous work task starts to be received using the normal frequency, wherein the first interval time is less than the second interval time.
The invention is provided with the small fan, and can perform wind blowing dehumidification on the circuit board; the loudspeaker is arranged to remind people of water entering the keyboard; the height of the rear side of the shell is larger than that of the front side, so that the small fan can be conveniently installed, and better accumulated water can be discharged conveniently.
The coupler of the invention adopts a microstrip structure, and has the advantages of compact design, simple processing, low cost and easy integration.
The invention adopts the equivalent structure of the loading open-circuit branch knot of the main line and the auxiliary line, and is convenient to realize miniaturization.
The invention adopts a structure of cascading two quarter-wavelength branch couplers, and can increase the bandwidth.
The coupler of the invention has good isolation degree, and the isolation degree is more than 20dB, which is superior to the isolation degree of most of the couplers reported.
The invention can carry out self-adaptive improvement according to actual requirements, and for the coupler, the center frequency ratio of two pass bands is adjusted by changing the impedance of the middle branch line; the electric length of the branch line is adjusted to be twice of the electric length of the branch line of the single-passband coupler, so that the coupler can work in a dual-passband environment, different application requirements are met, and the design is simple and flexible.
The humidity signal processing method improves the efficiency and accuracy of humidity detection; the control of the controller is facilitated.
Drawings
Fig. 1 is a schematic structural diagram of a waterproof electronic control system for a computer keyboard according to an embodiment of the present invention;
in the figure: 1. a housing; 2. a circuit board; 3. a small fan; 4. a controller; 5. a relay; 6. a speaker; 7. a humidity sensor; 8. and (4) draining the water.
Fig. 2 is a schematic diagram of a coupler with a planar structure according to an embodiment of the present invention.
In the figure: 9. a metal floor; 10. a dielectric substrate; 11. a main line; 12. a secondary line; 13. a first branch line; 14. a second branch line; 15. a third branch line; 16. an input end; 17. a first isolated port; 18. a coupling end; 19. a second isolated port.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings.
The structure of the invention is described in detail below with reference to the accompanying drawings:
as shown in fig. 1, the computer keyboard waterproof electronic control system provided by the embodiment of the present invention includes a keyboard main body, the keyboard main body includes a housing 1 and a circuit board 2 fixed inside the housing by screws, a plurality of small fans 3 are fixed inside the rear side of the housing 1 by screws, a controller 4, a relay 5 and a speaker 6 are clamped below the circuit board 2, a plurality of humidity sensors 7 are embedded on the surface of the circuit board 2, and a plurality of drain holes 8 are hollowed in the bottom 1 of the housing;
the height of the rear side of the shell 1 is greater than that of the front side;
the circuit board 2 is electrically connected with a controller 4 through a relay 5, and the small fan 3 and the loudspeaker 6 are electrically connected with the controller 4.
As a preferred embodiment of the invention, the controller 4 is model STM32F103ZET6, the relay 5 is model MY4NJ-24V, and the humidity sensor 7 is model HS1101.
When water is sprayed on the keyboard, the humidity sensor 7 detects a humidity signal and transmits the humidity signal to the controller 4, the controller 4 closes a power supply circuit of the circuit board 2 through the relay 5, and simultaneously controls the loudspeaker 6 to give out alarm sound and control the small fan 3 to rotate so as to blow and dehumidify the circuit board 2.
Fig. 2 shows a planar coupler according to an embodiment of the present invention, which mainly includes: the device comprises a metal floor 9, a dielectric substrate 10, a main line 11, a secondary line 12, a first branch line 13, a second branch line 14, a third branch line 15, an input end 16, a first isolation port 17, a coupling end 18 and a second isolation port 19;
the metal floor 9 is arranged on the bottom surface of the medium substrate 10, the input end 16 and the first isolation port 17 are respectively arranged at two ends of the main line 11 of the branch coupler, and the second isolation port 19 and the coupling end 18 are respectively arranged at two ends of the auxiliary line 12; the main line and the auxiliary line are both formed by microstrip lines loaded with open-circuit branches; the first branch line, the second branch line and the third branch line are connected with the main line and the secondary line, wherein the first branch line and the third branch line are respectively connected with two ends of the main line and the secondary line, and the second branch line is formed by connecting two symmetrical microstrip lines in parallel and is connected with one half of the length of the main line and the length of the secondary line; the main line, the auxiliary line, the first branch line, the second branch line, the third branch line, the input end, the first isolation port, the coupling end and the second isolation port are all printed on the dielectric substrate; the metal ground 1 is a complete ground; the single-pass band branch coupler of the planar structure of the embodiment of the invention is a coupler with only one port for outputting.
The dielectric plate material used in the invention is RT/duroid 5880, the relative dielectric constant is 2.2, the dielectric plate thickness is 0.787mm, the copper-clad thickness is 0.018mm, and the loss tangent is 0.0009; wherein L0=6mm, L1=42mm, L2=8mm, L3=4.7mm, L4=5.45mm, L5=5.1mm, L11=2mm, L12=1.65mm, L13=2.7mm, L14=3mm, L21=2.85mm, L22=6.59mm, L23=4.65mm, L31=1.7mm, L32=5.7mm, L33=2.65mm, w0=2.39mm, w1=2.2mm, w2= 3.54mm, w3= 1.mm, w11=0.35mm, w =1.59mm, w33=1.59mm, g =0.8mm; the total area size of the coupler is 0.46 x 0.32 (lambda) g ×λ g ) Significantly smaller than existing branch line couplers.
The invention is further described below with reference to specific assays.
The transfer function of the humidity sensor is:
wherein, ω is 0 For the center frequency of the filter, for different ω 0 K is k/omega 0 Keeping the same;
constructing a filter in a frequency domain, wherein the corresponding polar coordinate expression mode is as follows:
G(r,θ)＝G(r,r)·G(θ,θ)；
in the formula, G r (r) is the radial component controlling the filter bandwidth, G θ (θ) is the angular component controlling the filter direction;
r denotes the radial coordinate, theta denotes the angular coordinate, f 0 Is the center frequency, theta 0 Is the filter direction, σ f For determining a bandwidth;
Bf＝2(2/ln2)1/2|lnσ f |，σ θ determining an angular bandwidth, B θ =2 (2/ln 2) 1/2 σ θ ；
The controller analyzes the signals transmitted by the humidity sensor and then sends instructions to the small fans; the humidity signal analysis method of the controller comprises the following steps:
carrying out noise tracking on each frame of humidity signals in the humidity signals according to the following formula to obtain a noise spectrum N (w, N) of each frame of humidity signals:
wherein X (w, n) represents a short-time Fourier transform of the humidity signal; alpha u and alpha d are preset coefficients, and 0< alpha d < alpha u <1; w represents the frequency point sequence number on the frequency domain; n represents a frame number in the time domain;
carrying out binarization processing on the short-time Fourier transform of each frame of humidity signal according to the following formula to obtain a binary spectrum Xb (w, n):
tb is a preset first threshold value;
performing coherence matching between every two binary spectrums corresponding to the one path of humidity signal and the Kb binary spectrums corresponding to the other path of sound signal to obtain a first matching result, wherein the first matching result comprises matching positions and matching degrees corresponding to a group of binary spectrums with the highest matching degree, and both Ka and Kb are positive integers;
for each path of humidity signal, calculating the power spectrum P (w, n) of each frame of humidity signal in the sound signal according to the following formula:
P(w,n)＝α p P(w,n-1)+(1-α p )|X(w,n)| 2
wherein X (w, n) represents a short-time Fourier transform of the humidity signal;
alpha p is a preset coefficient, and alpha p is more than 0 and less than 1; w represents the frequency point serial number on the frequency domain; n represents a frame number in the time domain;
calculating the inter-spectrum correlation DP (w, n) of the power spectrum of each frame of the humidity signal according to the following formula:
DP(w,n)＝|P(w+1,n)-P(w,n)|
and carrying out noise tracking on the inter-spectrum correlation DP (w, n) according to the following formula to obtain the inter-spectrum correlation NDP (w, n) of the noise power spectrum of each frame of humidity signal:
wherein, beta u and beta d are preset coefficients, and beta d is more than 0 and more than beta u and less than 1;
the coupler with a planar structure is integrated on the circuit board and comprises a main line and an auxiliary line which are symmetrical left and right, and the main line and the auxiliary line are both formed by microstrip lines loaded with open-circuit branches; the main line and the sub line are connected with the first branch line, the second branch line and the third branch line, the second branch line is formed by connecting two symmetrical microstrip lines in parallel and is connected at the position of one half of the length of the main line and the sub line;
the planar structured coupler further comprises: the metal floor is arranged on the bottom surface of the medium substrate;
the two ends of the main line are respectively provided with an input end and a first isolation port, and the two ends of the auxiliary line are respectively provided with a second isolation port and a coupling end;
the first branch line and the third branch line are respectively connected to two end parts of the main line and the auxiliary line, the first branch line is close to the input end and the second isolation port, and the third branch line is close to the first isolation port and the coupling end;
the main line, the auxiliary line, the first branch line, the second branch line, the third branch line, the input end, the first isolation port, the coupling end and the second isolation port are all printed on the dielectric substrate;
the dielectric substrate is made of RT/duroid 5880, the relative dielectric constant is 2.2, the thickness of the dielectric plate is 0.787mm, the thickness of copper cladding is 0.018mm, and the loss tangent is 0.0009;
the main line and the secondary line are formed by cascading two quarter-wavelength transmission lines, each quarter-wavelength transmission line is formed by sequentially loading equivalent structures of three open-circuit branches on two transmission microstrip lines, the middle open-circuit branches are shared in the cascading process, and the main line and the secondary line are formed by loading equivalent structures of five open-circuit branches on four microstrip lines;
the equivalent process of the main line and the auxiliary line equivalent circuit is as follows:
the a parameter matrix for the quarter-wavelength transmission line is:
the A parameter matrix of the equivalent circuit is as follows:
while
Solving the above matrix, one can obtain:
wherein, theta 2 ＝90deg,θ 21 ＝22.5deg,θ 22 ＝45deg and Z 2 ＝35.35Ω。
Setting a humidity critical value;
judging a maximum processable load according to the humidity critical value;
combining a plurality of first work tasks into a first continuous work task according to a collection platform power management technology;
judging whether a load capacity of the first continuous work task is larger than the maximum processable load capacity;
when the load capacity of the first continuous working task is larger than the maximum processable load capacity, moving an overloaded part of the first working tasks in the first continuous working task out of the first continuous working task;
when receiving the first continuous work task, switching the controller from a sleep mode to an operation mode, and processing the first continuous work task; and setting the controller to be in a sleep mode after the first continuous work task is processed.
The operation frequency of the controller has a normal operation frequency under a general operation, and the humidity control method of the controller further includes:
determining a first operating frequency according to the load of the first continuous work task and the temperature critical value;
when the controller is switched to the operation mode, the operation frequency of the controller is increased from the normal operation frequency to a first operation frequency, and the first continuous work task is processed through the first operation frequency;
wherein the first operating frequency has an operating frequency higher than an operating frequency of the normal operating frequency.
The humidity control method of the controller further includes:
when the first continuous work task is processed and the controller enters a sleep mode, combining a plurality of second work tasks and the first work task of the overload part into a second continuous work task according to the power management technology of the convergence platform;
when a second continuous working task is received, the controller is switched from the sleep mode to the operation mode;
the operation frequency of the controller is increased from the normal operation frequency to a second operation frequency, and a second continuous work task is processed through the second operation frequency; and after the second continuous work task is processed, setting the controller into a sleep mode;
wherein the first operating frequency has an operating frequency higher than an operating frequency of the normal operating frequency.
The controller has a first interval time between a time point when the first continuous work task is completed and a time point when the second continuous work task starts to be received by using the first operation frequency, and has a second interval time between the time point when the first continuous work task is completed and the time point when the second continuous work task starts to be received by using the normal frequency, wherein the first interval time is less than the second interval time.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (5)
1. The waterproof electronic control system for the computer keyboard is characterized by comprising a keyboard main body, wherein the keyboard main body comprises a shell and a circuit board fixed in the shell through screws; a plurality of small fans are fixed inside the rear side of the shell through screws, and a controller, a relay and a loudspeaker are clamped below the circuit board; a plurality of humidity sensors are embedded on the surface of the circuit board, and a plurality of drain holes are hollowed in the bottom of the shell;
the height of the rear side of the shell is greater than that of the front side;
the circuit board is electrically connected with the controller through a relay, and the small fan and the loudspeaker are electrically connected with the controller;
the transfer function of the humidity sensor is:
wherein, ω is 0 For the center frequency of the filter, for different ω 0 K is k/ω 0 Keeping the same;
constructing a filter in a frequency domain, wherein the corresponding polar coordinate expression mode is as follows:
G(r,θ)＝G(r,r)·G(θ,θ)；
in the formula, G r (r) is the radial component controlling the bandwidth of the filter, G θ (θ) is the angular component that controls the filter direction;
r denotes the radial coordinate, theta denotes the angular coordinate, f 0 Is the center frequency, theta 0 Is the filter direction, σ f For determining a bandwidth;
Bf＝2(2/ln2)1/2|lnσ f |，σ θ determining an angular bandwidth, B θ =2 (2/ln 2) 1/2 σ θ ；
The controller analyzes the signals transmitted by the humidity sensor and then sends instructions to the small fans; the humidity signal analysis method of the controller comprises the following steps:
performing noise tracking on each frame of humidity signals in the humidity signals according to the following formula to obtain a noise spectrum N (w, N) of each frame of humidity signals:
wherein X (w, n) represents a short-time Fourier transform of the humidity signal; alpha u and alpha d are preset coefficients, and 0< alpha d < alpha u <1; w represents the frequency point serial number on the frequency domain; n represents a frame number in the time domain;
and (3) carrying out binarization processing on the short-time Fourier transform of each frame of humidity signal according to the following formula to obtain a binary spectrum Xb (w, n):
tb is a preset first threshold value;
performing pairwise coherence matching on Ka binary spectrums corresponding to one path of humidity signal and Kb binary spectrums corresponding to the other path of sound signal to obtain a first matching result, wherein the first matching result comprises matching positions and matching degrees corresponding to a group of binary spectrums with the highest matching degree, and both Ka and Kb are positive integers;
for each path of humidity signal, calculating the power spectrum P (w, n) of each frame of humidity signal in the sound signal according to the following formula:
P(w，n)＝α p P(w，n-1)+(1-α p )|X(w，n) | 2
wherein X (w, n) represents a short-time Fourier transform of the humidity signal;
alpha p is a preset coefficient, and alpha p is more than 0 and less than 1; w represents the frequency point sequence number on the frequency domain; n represents a frame number in the time domain;
calculating the inter-spectrum correlation DP (w, n) of the power spectrum of each frame of the humidity signal according to the following formula:
DP(w,n)＝|P(w+1,n)-P(w,n)|
and carrying out noise tracking on the inter-spectrum correlation DP (w, n) according to the following formula to obtain the inter-spectrum correlation NDP (w, n) of the noise power spectrum of each frame of humidity signal:
wherein, beta u and beta d are preset coefficients, and beta d is more than 0 and less than beta u and less than 1;
the coupler with a planar structure is integrated on the circuit board and comprises a main line and an auxiliary line which are bilaterally symmetrical, and the main line and the auxiliary line are both formed by microstrip lines loaded with open-circuit branches; the main line and the secondary line are connected with the first branch line, the second branch line and the third branch line, the second branch line is formed by connecting two symmetrical microstrip lines in parallel and is connected at the position of one half of the length of the main line and the secondary line;
the planar structured coupler further comprises: the metal floor is arranged on the bottom surface of the medium substrate;
the two ends of the main line are respectively provided with an input end and a first isolation port, and the two ends of the auxiliary line are respectively provided with a second isolation port and a coupling end;
the first branch line and the third branch line are respectively connected to two end parts of the main line and the auxiliary line, the first branch line is close to the input end and the second isolation port, and the third branch line is close to the first isolation port and the coupling end;
the main line, the auxiliary line, the first branch line, the second branch line, the third branch line, the input end, the first isolation port, the coupling end and the second isolation port are all printed on the dielectric substrate;
the dielectric substrate material is RT/duroid 5880, the relative dielectric constant is 2.2, the dielectric plate thickness is 0.787mm, the copper-clad thickness is 0.018mm, and the loss tangent is 0.0009;
the main line and the secondary line are formed by cascading two sections of quarter-wavelength transmission lines, each section of quarter-wavelength transmission line is formed by sequentially loading an equivalent structure of three open-circuit branches on two sections of transmission microstrip lines, and the middle open-circuit branches are shared in the cascading process to form the main line and the secondary line which are formed by loading an equivalent structure of five open-circuit branches on four sections of microstrip lines;
the equivalent process of the main line and the auxiliary line equivalent circuit is as follows:
the a parameter matrix for the quarter-wavelength transmission line is:
the A parameter matrix of the equivalent circuit is as follows:
while
Solving the above matrix, one can obtain:
wherein, theta 2 ＝90deg,θ 21 ＝22.5deg,θ 22 ＝45deg and Z 2 ＝35.35Ω。
2. A computer keyboard waterproof electronic control system according to claim 1, wherein the humidity control method of the controller comprises:
setting a humidity critical value;
judging a maximum processable load according to the humidity critical value;
combining a plurality of first work tasks into a first continuous work task according to the collection platform power management technology;
judging whether a load capacity of the first continuous work task is larger than the maximum processable load capacity;
when the load capacity of the first continuous working task is larger than the maximum processable load capacity, moving an overloaded part of the first working tasks in the first continuous working task out of the first continuous working task;
when receiving a first continuous working task, switching the controller from a sleep mode to an operation mode, and processing the first continuous working task; and setting the controller to be in a sleep mode after the first continuous work task is processed.
3. A computer keyboard waterproof electronic control system as claimed in claim 2, wherein the operation frequency of the controller has a normal operation frequency under a general operation, and the humidity control method of the controller further comprises:
determining a first operating frequency according to the load of the first continuous work task and the temperature critical value;
when the controller is switched to the operation mode, the operation frequency of the controller is increased from the normal operation frequency to a first operation frequency, and the first continuous work task is processed through the first operation frequency;
wherein the first operating frequency has an operating frequency higher than an operating frequency of the normal operating frequency.
4. A computer keyboard water-proof electronic control system as recited in claim 2, wherein the humidity control method of the controller further comprises:
when the first continuous work task is processed and the controller enters a sleep mode, combining a plurality of second work tasks and the first work task of the overload part into a second continuous work task according to the power management technology of the convergence platform;
when a second continuous working task is received, the controller is switched from the sleep mode to the operation mode;
increasing the operation frequency of the controller from the normal operation frequency to a second operation frequency, and processing a second continuous work task through the second operation frequency; when the second continuous work task is processed, the controller is set to be in a sleep mode;
wherein the first operating frequency has an operating frequency higher than an operating frequency of the normal operating frequency.
5. The computer keyboard waterproof electronic control system of claim 2, wherein the controller has a first interval time between a time point when the first continuous job task is completed and a time point when the second continuous job task is started to be received using the first operating frequency, and has a second interval time between the first continuous job task is completed and the second continuous job task is received using the normal frequency, wherein the first interval time is less than the second interval time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711044071.1A CN107817901A (en) | 2017-10-31 | 2017-10-31 | A kind of computer keyboard waterproof electronic control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711044071.1A CN107817901A (en) | 2017-10-31 | 2017-10-31 | A kind of computer keyboard waterproof electronic control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107817901A true CN107817901A (en) | 2018-03-20 |
Family
ID=61602926
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711044071.1A Pending CN107817901A (en) | 2017-10-31 | 2017-10-31 | A kind of computer keyboard waterproof electronic control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107817901A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109656381A (en) * | 2018-12-28 | 2019-04-19 | 广东虹勤通讯技术有限公司 | A kind of water inlet means of defence and electric terminal |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103543811A (en) * | 2012-07-10 | 2014-01-29 | 宏碁股份有限公司 | Central processing unit control method |
| CN103605963A (en) * | 2013-03-01 | 2014-02-26 | 新乡学院 | Fingerprint identification method |
| CN103777766A (en) * | 2014-01-16 | 2014-05-07 | 万美英 | Novel integral waterproof keyboard of notebook computer |
| CN104393390A (en) * | 2014-12-05 | 2015-03-04 | 西安电子科技大学 | Compact plane branch coupler for single-pass or double-pass band |
| CN204719677U (en) * | 2015-06-20 | 2015-10-21 | 孙晓燕 | A kind of computing machine waterproff keyboard |
| CN105469484A (en) * | 2015-11-20 | 2016-04-06 | 宁波大业产品造型艺术设计有限公司 | App intelligent home lock |
| CN106412749A (en) * | 2016-11-10 | 2017-02-15 | 歌尔科技有限公司 | Earphone waterproof structure, earphone and bracelet |
| CN107088028A (en) * | 2017-06-29 | 2017-08-25 | 武汉洁美雅科技有限公司 | A kind of new-type Wet-dry dust collector robot control system of intelligence |
| US20170277228A1 (en) * | 2014-10-03 | 2017-09-28 | Intel Corporation | Electronic device with keyboard protection |
-
2017
- 2017-10-31 CN CN201711044071.1A patent/CN107817901A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103543811A (en) * | 2012-07-10 | 2014-01-29 | 宏碁股份有限公司 | Central processing unit control method |
| CN103605963A (en) * | 2013-03-01 | 2014-02-26 | 新乡学院 | Fingerprint identification method |
| CN103777766A (en) * | 2014-01-16 | 2014-05-07 | 万美英 | Novel integral waterproof keyboard of notebook computer |
| US20170277228A1 (en) * | 2014-10-03 | 2017-09-28 | Intel Corporation | Electronic device with keyboard protection |
| CN104393390A (en) * | 2014-12-05 | 2015-03-04 | 西安电子科技大学 | Compact plane branch coupler for single-pass or double-pass band |
| CN204719677U (en) * | 2015-06-20 | 2015-10-21 | 孙晓燕 | A kind of computing machine waterproff keyboard |
| CN105469484A (en) * | 2015-11-20 | 2016-04-06 | 宁波大业产品造型艺术设计有限公司 | App intelligent home lock |
| CN106412749A (en) * | 2016-11-10 | 2017-02-15 | 歌尔科技有限公司 | Earphone waterproof structure, earphone and bracelet |
| CN107088028A (en) * | 2017-06-29 | 2017-08-25 | 武汉洁美雅科技有限公司 | A kind of new-type Wet-dry dust collector robot control system of intelligence |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109656381A (en) * | 2018-12-28 | 2019-04-19 | 广东虹勤通讯技术有限公司 | A kind of water inlet means of defence and electric terminal |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6122533A (en) | Superconductive planar radio frequency filter having resonators with folded legs | |
| JP3310670B2 (en) | Directional coupler for wireless devices | |
| US20100102899A1 (en) | Waveguide antenna front end | |
| WO1998000880A9 (en) | Planar radio frequency filter | |
| CN103441340A (en) | Half-mode substrate integrated waveguide leaky-wave antenna for variable polarization and frequency scanning | |
| CN106816678B (en) | It is a kind of with any output amplitude and phase across directional coupler | |
| Hendry et al. | Compact high-isolation base-station duplexer using triple-mode ceramic cavities | |
| CN110600875A (en) | Low-profile, compact linear polarization and circularly polarized filter antenna with high selectivity | |
| CN104767022B (en) | New 90 ° of integrated couplers of ultra-wideband | |
| CN114976547B (en) | Microstrip line coupler, radio frequency module and printed circuit board | |
| CN100568620C (en) | A kind of microwave power distributor with multiple power-division ratios | |
| CN107817901A (en) | A kind of computer keyboard waterproof electronic control system | |
| CN112838840B (en) | Broadband equal-power distribution/synthesis circuit topology with broadband deep isolation | |
| CN112993507A (en) | Miniaturized T-shaped branch waveguide broadband power divider | |
| US6946927B2 (en) | Suspended substrate low loss coupler | |
| Ho et al. | Slot-coupled double-sided microstrip interconnects and couplers | |
| Sakagami et al. | On a lumped element three-branch 3-dB coupler with Butterworth and Chebyshev characteristics | |
| US20070120620A1 (en) | Tunable surface mount ceramic coupler | |
| Liu et al. | A novel compact diplexer with high isolation based on the mode composite ridged waveguide | |
| CN219937346U (en) | Coupler and radio frequency front end module | |
| CN112563711B (en) | Rectangular patch-half-mode substrate integrated waveguide hybrid 90-degree directional coupler | |
| Yuan et al. | An extremely compact dual‐band branch‐line coupler | |
| JPS625534B2 (en) | ||
| Song et al. | Wideband signal combining circuit based on multichannel different‐/same‐frequency power combiner | |
| CN114374064A (en) | Reverse-phase broadband power division filter and wireless communication system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180320 |
|
| RJ01 | Rejection of invention patent application after publication |