CN113114198B - Concave embedded type cavity induction key system - Google Patents
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- 230000006698 induction Effects 0.000 title claims abstract description 68
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- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/687—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors
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Abstract
The invention discloses a concave embedded type cavity induction key system, which relates to the technical field of keys and comprises an installation body, an induction module, a control module and a target electrical appliance, wherein an induction cavity is formed at one end of the installation body in a concave manner, and the induction module is electrically connected with the control module; the induction module is arranged on the mounting body and used for generating a first electric signal after foreign matters enter the induction cavity, the control module is used for generating a second electric signal according to the first electric signal, and the second electric signal is used for controlling the current of the target electrical appliance. The invention has the advantages of high sensitivity, convenient installation and good user experience.
Description
Technical Field
The invention relates to the technical field of keys, in particular to a concave embedded type cavity induction key system.
Background
A key is a commonly used element for controlling an electrical device, and is a switch for turning on or off a 'control circuit' (in which current is small) so as to control an electric motor or other electrical equipment. The existing key is arranged outside the equipment, when the requirement on the flatness of the outer surface of some equipment is high, the setting difficulty is high, extra installation cost is needed, the refitting is not facilitated, and more importantly, the key positioned outside can easily cause external interference, namely, the key is easily touched by mistake, and the stability of the system is not facilitated.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a concave embedded type cavity induction key system.
A concave embedded type cavity induction key system comprises an installation body, an induction module, a control module and a target electrical appliance, wherein an induction cavity is formed in the concave part of one end of the installation body, and the induction module is electrically connected with the control module; the induction module is arranged on the installation body and used for generating a first electric signal after foreign matters enter the induction cavity, the control module is used for generating a second electric signal according to the first electric signal, and the second electric signal is used for controlling the current of the target electric appliance.
Preferably, the induction module comprises an induction unit and a voltage regulation unit, the voltage regulation unit comprises a voltage stabilizing circuit and a preset resistor, and the induction unit and the preset resistor are connected in series on the voltage stabilizing circuit; the sensing unit is arranged in the sensing cavity, the resistance value of the sensing unit is changed after foreign matters enter the sensing cavity, and the voltage stabilizing circuit is used for changing the voltage of the sensing unit after the resistance value of the sensing unit is changed, so that a first electric signal is generated. The voltage stabilizing circuit is connected with a constant power supply voltage due to the induction unit and the preset resistorSerially connected to the voltage regulator circuit, and preset resistor with voltage V a Voltage of the induction unit is V b If the voltage value of the voltage stabilizing circuit is not changed, V is a And V b The sum is unchanged, thus producing the following: if no foreign matter enters the sensing cavity, the resistance value of the sensing unit is unchanged, so that V is a And V b And is unchanged to generate the first electrical signal. If the sensing unit enters the foreign matters in the sensing cavity, the resistance value of the sensing unit is increased, and V is obtained on the premise that the resistance value of the preset resistor is constant b Is increased to thereby generate a first electrical signal. If the sensing unit is in after entering the foreign matter in the sensing cavity, the resistance value of the sensing unit is reduced, and on the premise that the resistance value of the preset resistor is constant, V is b And lowered to thereby generate a first electrical signal. To sum up, through induction element and pressure regulating unit, can detect sensitively and sense the response cavity and whether have the foreign matter, simple structure, reasonable in design exports different first signal of telecommunication and lets follow-up control module group handle to obtain different second signal of telecommunication, and then realize different control results.
Preferably, the control module comprises a first power supply and a first NPN transistor, the first NPN transistor is disposed between the first power supply, the voltage regulator circuit and the target electrical appliance, and the first NPN transistor is configured to generate a second electrical signal according to the first electrical signal, and the second electrical signal is configured to adjust a current between the first power supply and the target electrical appliance.
Preferably, the first NPN triode includes a base, a collector and an emitter, the collector is electrically connected to the first power supply, the emitter is electrically connected to the target electrical appliance, and the base is electrically connected to the voltage stabilizing circuit; the first NPN triode is used for generating a second electric signal after the base voltage is changed, and the second electric signal is also used for adjusting the current between the collector and the emitter. The first NPN triode is arranged between the first power supply, the voltage stabilizing circuit and the target electrical appliance, and preferably, the base electrode of the first NPN triode is connected with the voltage stabilizing circuit and is positioned on the voltage stabilizing circuitAnd the collector is connected with the positive electrode of the first power supply, so that the induction power supply is connected with the first NPN triode in parallel. When the induction cavity works, if the induction unit enters foreign matters in the induction cavity, the resistance value of the induction unit is increased, and on the premise that the resistance value of the preset resistor is constant, V is b Increasing the base voltage to increase the base current, amplifying the current between the collector and the emitter by using a current amplification principle of a first NPN triode, and enabling the first power supply to be connected with a target electric appliance if the current is increased from zero; preferably, the foreign matter continuously enters or moves out of the sensing cavity, and if the resistance value of the sensing unit continuously increases, V b If the current between the collector and the emitter is continuously increased, the current between the collector and the emitter is continuously amplified, that is, the current voltage of the target electrical appliance is continuously increased to the maximum value, so that the conduction control of the target electrical appliance is realized; if the resistance of the sensing unit is continuously reduced, V b The current between the collector and the emitter is continuously reduced, that is, the current voltage of the target electrical appliance is reduced to the minimum value, so as to realize the stop control of the target electrical appliance. The base electrode is connected with the voltage stabilizing circuit and is positioned between the sensing unit and the preset resistor, but the whole first NPN triode is connected with the preset resistor in parallel unlike the figure, so the whole control process is opposite to the control process. When the induction cavity works, if the induction unit enters foreign matters in the induction cavity, the resistance value of the induction unit is increased, and on the premise that the resistance value of the preset resistor is constant, V is b Increase, then V a Decrease since the voltage at the base is now equal to V a And reducing the base voltage to reduce the base current, and multiplying the current between the collector and the emitter by the current amplification principle of the first NPN triode to gradually stop the target electric appliance. Under the condition, when no foreign matters exist in the whole induction cavity, the current and the voltage of the target electric appliance are the largest, so that the target electric appliance is in the maximum power state, and when the foreign matters are inserted, the power of the target electric appliance is gradually reduced, so that the induction cavity has a better use prospect in certain application occasions.
Preferably, the control module further comprises a second power supply and an operational amplifier, the operational amplifier is arranged among the first power supply, the voltage stabilizing circuit and the target electrical appliance, the operational amplifier is used for generating a second electrical signal according to the first electrical signal, and the second electrical signal is used for adjusting the input current of the target electrical appliance.
Preferably, the operational amplifier comprises a power supply node, a normal phase node, an inverse phase node, a grounding node and an output node, wherein the normal phase node is electrically connected with the voltage stabilizing circuit, the inverse phase node is electrically connected with the comparison circuit, the power supply node is electrically connected with the second power supply, the grounding node is grounded, and the output node is electrically connected with the target electrical appliance; the voltage stabilizing circuit is used for forming a positive-phase voltage at the positive-phase node, the first electric signal is used for adjusting the positive-phase voltage, the comparison circuit is used for forming an inverse-phase voltage at the inverse-phase node, and the operational amplifier is used for comparing the positive-phase voltage with the inverse-phase voltage and generating a second electric signal according to a comparison result; the second electrical signal is for outputting a high voltage at an output node when the positive phase voltage is greater than the negative phase voltage; the second electrical signal is for outputting a low voltage at an output node when the positive phase voltage is greater than the reverse phase voltage. The operational amplifier is connected in parallel with the whole sensing unit, the grounding node is grounded, and the output node is connected to the target electrical appliance. When the induction cavity works, if the induction unit enters foreign matters in the induction cavity, the resistance value of the induction unit is increased, and on the premise that the resistance value of the preset resistor is constant, V is b Increasing the positive phase voltage at the positive phase node, and outputting high voltage at the output node directly when the positive phase voltage is greater than the negative phase voltage according to the comparison principle of the operational amplifier, thereby realizing the conduction control of the target electrical appliance, otherwise, only the positive phase voltage is requiredIf the voltage is less than the inverse voltage, a low voltage is output at the output node, and the target electrical appliance is always in an off state. The positive phase node is connected with the voltage stabilizing circuit and is positioned between the preset resistor and the induction unit, but the operational amplifier is connected with the whole preset resistor in parallel. When the induction cavity works and foreign matters in the induction cavity are gradually drawn away, the resistance value of the induction unit is reduced, and V is obtained on the premise that the resistance value of the preset resistor is constant b Decrease, then V a Increase since the positive phase voltage now equals V a If the positive phase voltage is higher than the negative phase voltage, the positive phase voltage is directly output at the output node through the comparison principle of the operational amplifier, so that the conduction control of the target electric appliance is realized, otherwise, if the positive phase voltage is lower than the negative phase voltage, the low voltage is output at the output node, and the target electric appliance is always in a power-off state.
Preferably, the sensing unit includes an emitting end and a receiving end, the emitting end is configured to emit an optical signal toward the receiving end, the receiving end is configured to change a resistance value of the receiving end according to the received optical signal, and the voltage stabilizing circuit is configured to change a voltage of the receiving end after the resistance value of the receiving end is changed, so as to generate the first electrical signal. Preferably, the receiving end is a photo resistor, and when the optical signal emitted from the emitting end is received, the resistance value of the receiving end is reduced, and when the optical signal emitted from the emitting end cannot be received, the resistance value of the receiving end is increased, so that a subsequent control process is realized.
Preferably, the receiving end and the transmitting end are opposite to each other, and the sensing cavity is located between the receiving end and the transmitting end. When the transmitting end is right opposite to the receiving end, when foreign matters enter the sensing cavity between the transmitting end and the receiving end, optical signals received by the receiving end are immediately reduced, so that high-sensitivity feedback is realized, and the subsequent control process is smoothly carried out. Meanwhile, it should be noted that, in this arrangement, in a normal state, that is, when there is no foreign matter in the sensing cavity, the receiving terminal always receives the most optical signals, and the resistance value of the receiving terminal is at the maximum value, which means that the target electrical appliance is at a certain critical value, for example, at a start state in a maximum power state or at an off-stop state.
Preferably, the receiving end and the transmitting end are arranged in a staggered manner, and the receiving end is used for receiving the optical signal reflected by the foreign matter in the sensing cavity. When the transmitting end is not just opposite to the receiving end, when foreign matters enter the sensing cavity between the transmitting end and the receiving end, the foreign matters can reflect the optical signals sent by the transmitting end, so that the receiving end receives the optical signals, high-sensitivity feedback is realized, and the subsequent control process is smoothly carried out. Meanwhile, it should be noted that in this arrangement, in a normal state, that is, when there is no foreign matter in the sensing cavity, the receiving terminal does not receive the optical signal all the time, and the resistance value of the receiving terminal is at the minimum value, which means that the target electrical appliance is at a critical value, for example, at a start state in a maximum power state, or at an off-stop state.
Preferably, the induction module comprises a microwave controller, the control module comprises a third power supply, a second NPN transistor and a switching circuit, the switching circuit is electrically connected with the third power supply and the microwave controller, and the second NPN transistor is arranged among the switching circuit, the third power supply and the target appliance; the microwave controller is used for transmitting electromagnetic waves into the induction cavity, receiving echoes reflected by foreign matters in the induction cavity and generating a first electric signal after receiving the echoes; the switch circuit is used for switching on or switching off a third power supply and a second NPN triode after receiving the first electric signal; the second NPN triode is used for generating a second electric signal according to the first electric signal, and the second electric signal is used for adjusting the current between a third power supply and the target electric appliance after the third power supply and the second NPN triode are connected. Similarly, the microwave controller transversely emits high-frequency electromagnetic waves into the induction cavity and receives echoes of the high-frequency electromagnetic waves to induce movement of objects entering the induction cavity, if foreign matters enter, the microprocessor is triggered to execute instructions of the microwave controller, on one hand, the switching circuit is controlled to be switched on and switched off, and after the switching circuit is switched off, the third power supply is switched on with the second NPN triode.
The invention has the beneficial effects that:
in the invention, the keys are arranged in the equipment, so that the flatness of the surface of the equipment is improved, the installation difficulty is reduced, the equipment is favorably modified, the whole key system is hidden, the external interference is less, the stability of the system is favorably realized, the reliability of the keys is improved, the service life of the keys is prolonged, more importantly, the response is extremely sensitive, the equipment can be started without being inserted and started after being inserted, the equipment can be started and stopped without being contacted, and the operation experience is improved, and the equipment can be accepted by users in the current epidemic situation popular times.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings used in the detailed description or the prior art description will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
FIG. 1 is a schematic diagram of a module according to the present invention;
FIG. 2 is a schematic structural diagram of the transmitting terminal and the receiving terminal of the present invention when they are arranged opposite to each other;
FIG. 3 is a cross-sectional view of the transmitter and receiver of the present invention in a configuration in which they are disposed opposite to each other;
FIG. 4 is a schematic view of the structure of FIG. 3 with a foreign object entering the sensing cavity according to the present invention;
FIG. 5 is a circuit diagram of a first NPN transistor connected in parallel with an inductive element according to the present invention;
FIG. 6 is a circuit diagram of an operational amplifier and a sensing unit connected in parallel according to the present invention;
FIG. 7 is a schematic structural diagram of the present invention when the transmitting end and the receiving end are not arranged opposite to each other;
FIG. 8 is a cross-sectional view of the transmitter and receiver in a non-aligned configuration in accordance with the present invention;
FIG. 9 is a schematic view of the structure of FIG. 8 with a foreign object entering the sensing cavity according to the present invention;
fig. 10 is a circuit diagram of the first NPN transistor of the present invention connected in parallel to the predetermined resistor;
FIG. 11 is a circuit diagram of the operational amplifier of the present invention connected in parallel with a predetermined resistor;
FIG. 12 is a schematic view of the microwave controller of the present invention operating in the sensing cavity;
FIG. 13 is a circuit diagram of the microwave controller electrically connected to the control module according to the present invention.
Reference numerals:
1-a mounting body, 11-a sensing cavity, 2-a sensing module, 21-a sensing unit, 211-a transmitting terminal, 212-a receiving terminal, 22-a voltage regulating unit, 221-a voltage stabilizing circuit, 222-a preset resistor, 23-a microwave controller, 3-a control module, 31-a first power supply, 32-a first NPN triode, 321-a base, 322-a collector, 323-an emitter, 33-a second power supply, 34-an operational amplifier, 341-a power supply node, 342-a positive phase node, 343-a reverse phase node, 344-a ground node, 345-an output node, 35-a comparison circuit, 36-a third power supply, 37-a second NPN triode, 38-a switching circuit, 4-a target electrical appliance and 5-a foreign object.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined or explained in subsequent figures. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be noted that the terms "inside", "outside", "upper", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships usually placed when the products of the present invention are used, and are only used for convenience of description and simplification of the description, but do not indicate or imply that the devices or elements referred to must have specific orientations, be constructed in specific orientations, and operate, and therefore, should not be construed as limiting the present invention.
As shown in fig. 1 to 13, a recessed embedded cavity sensing key system includes an installation body 1, a sensing module 2, a control module 3 and a target electrical appliance 4, wherein a sensing cavity 11 is formed at one end of the installation body 1, and the sensing module 2 is electrically connected to the control module 3; wherein, response module 2 sets up on installation body 1 for get into behind foreign matter 5 the first signal of generating in response cavity 11, control module 3 is used for generating the second signal of generating according to first signal of electric, and the second signal of electric is used for controlling the electric current size of inserting target electrical apparatus 4.
In the present embodiment, it should be noted that, in the whole system, the installation body 1 can be inserted into the inside of the device, and the sensing cavity 11 formed by the inner recess constitutes a sensing key system. Specifically, in user's finger or other arbitrary objects penetrate response cavity 11, response module 2 can detect the inside change of response cavity 11, thereby produce the feedback and generate first signal of telecommunication, wherein the feedback that response module 2 obtained can be optical feedback, temperature feedback, infrared feedback, pressure feedback or microwave feedback etc. furthermore, control module 3 receives first signal of telecommunication, and produce the second signal of telecommunication according to current first signal of telecommunication, with this control access target electrical apparatus 4's electric current size, wherein the electric current size is minimum 0A, the maximum current size is predetermine according to control module 3 access electric current, simultaneously, because first signal of telecommunication is real-time change, therefore target electrical apparatus 4's electric current size can change in real time. To sum up, through setting up the button inside equipment, the roughness on equipment surface has been improved, reduce the installation degree of difficulty, be favorable to the equipment repacking, and whole key system hides, it is few to receive external disturbance, be favorable to the stability of system, improve the reliability and the life of button, more crucial, through the induction type feedback of button in-process, not only the reaction is extremely sensitive, accomplish not inserting and not starting, insert and start promptly, can also accomplish contactless start-up and stop equipment, also can be accepted by the masses of users in the era that current epidemic situation is popular when improving operation experience.
Specifically, the sensing module 2 includes a sensing unit 21 and a voltage regulating unit 22, the voltage regulating unit 22 includes a voltage stabilizing circuit 221 and a preset resistor 222, and the sensing unit 21 and the preset resistor 222 are connected in series to the voltage stabilizing circuit 221; the sensing unit 21 is disposed in the sensing cavity 11, the sensing unit 21 is configured to change a resistance value of the sensing unit 21 after the foreign object 5 enters the sensing cavity 11, and the voltage stabilizing circuit 221 is configured to change a voltage of the sensing unit 21 after the resistance value of the sensing unit 21 is changed, so as to generate a first electrical signal.
In this embodiment, it should be noted that, the voltage stabilizing circuit 221 is connected to a constant power voltage, and since the sensing unit 21 and the preset resistor 222 are connected in series to the voltage stabilizing circuit 221, the resistance of the preset resistor 222 is preset, wherein the voltage of the preset resistor 222 is V a The voltage of the induction unit 21 is V b If the voltage value of the voltage stabilizing circuit 221 is not changed, then V a And V b The sum is constant, thus yielding the following:
if no foreign matter 5 enters the sensing cavity 11, the resistance value of the sensing unit 21 is not changed, so that V a And V b And is unaltered to generate the first electrical signal.
If the sensing unit21 enters the foreign body 5 in the sensing cavity 11, the resistance value of the sensing unit 21 is increased, and V is set on the premise that the resistance value of the preset resistor 222 is constant b Is increased to thereby generate a first electrical signal.
If the sensing unit 21 enters the foreign object 5 in the sensing cavity 11, the resistance of the sensing unit 21 decreases, and V is equal to V on the premise that the resistance of the preset resistor 222 is constant b And lowered to thereby generate a first electrical signal.
To sum up, through induction element 21 and pressure regulating unit 22, can sensitively detect and sense whether response cavity 11 has foreign matter 5, simple structure, reasonable in design exports different first signal of telecommunication and lets follow-up control module 3 handle to obtain different second signal of telecommunication, and then realize different control results.
Specifically, the control module 3 includes a first power source 31 and a first NPN transistor 32, the first NPN transistor 32 is disposed between the first power source 31, the voltage stabilizing circuit 221, and the target electrical appliance 4, and the first NPN transistor 32 is configured to generate a second electrical signal according to the first electrical signal, and the second electrical signal is configured to adjust a current between the first power source 31 and the target electrical appliance 4.
Specifically, the first NPN transistor 32 includes a base 321, a collector 322, and an emitter 323, the collector 322 is electrically connected to the first power source 31, the emitter 323 is electrically connected to the target electrical apparatus 4, and the base 321 is electrically connected to the voltage regulator circuit 221; the first electrical signal is used to change the voltage of the base 321, and the first NPN transistor 32 is further used to generate a second electrical signal after the voltage of the base 321 is changed, and the second electrical signal is further used to adjust the current magnitude between the collector 322 and the emitter 323.
In the present embodiment, it should be noted that the first NPN transistor 32 is disposed between the first power supply 31, the voltage regulator 221 and the target electrical apparatus 4, specifically, as shown in fig. 5, wherein the base 321 is connected to the voltage regulator 221 and is located between the sensing unit 21 and the preset resistor 222, and the collector 322 is connected to the positive pole of the first power supply 31, so that the sensing power is connected in parallel to the first NPN transistor 32. In operation, if the sensing unit 21 enters the foreign object 5 in the sensing cavity 11, the resistance of the sensing unit 21 increases, and V is equal to V on the premise that the resistance of the preset resistor 222 is constant b Increasing, then letting the radicalThe voltage of the electrode 321 is increased, so that the current of the base electrode 321 is increased, and the current between the collector electrode 322 and the emitter electrode 323 is amplified by the current amplification principle of the first NPN triode, so that the first power supply 31 is connected to the target electrical apparatus 4 if the current is increased from zero, and it should be noted that the resistance value of the sensing unit 21 is increased or decreased according to the degree of the foreign object 5 entering the sensing cavity 11; specifically, the foreign object 5 continuously enters or moves out of the sensing cavity 11, and if the resistance value of the sensing unit 21 continuously increases, V b The current between the collector 322 and the emitter 323 is continuously amplified if the current is continuously increased, that is, the current voltage of the target electrical apparatus 4 is increased to the maximum value, so as to implement the conduction control of the target electrical apparatus 4; if the resistance of the sensing unit 21 is continuously decreased, V b The current between the collector 322 and the emitter 323 is continuously reduced, that is, the current voltage of the target appliance 4 is reduced to the minimum value, so as to realize the shutdown control of the target appliance 4.
It should be noted that, as shown in fig. 10, the base 321 is connected to the voltage stabilizing circuit 221 and is located between the sensing unit 21 and the preset resistor 222, but unlike the drawing, the whole first NPN transistor 32 is connected in parallel to the preset resistor 222, and therefore, the whole control process is opposite to the above. In operation, if the sensing unit 21 enters the foreign object 5 in the sensing cavity 11, the resistance of the sensing unit 21 increases, and V is equal to V on the premise that the resistance of the preset resistor 222 is constant b Increase, then V a Decrease since the voltage at the base 321 now equals V a Then, the voltage of the base 321 is decreased so that the current of the base 321 is decreased, and the current between the collector 322 and the emitter 323 is doubled by the current amplification principle of the first NPN triode, so that the target electrical apparatus 4 is gradually turned off. In this case, when there is no foreign object 5 in the entire sensing cavity 11, the current and voltage of the target electrical appliance 4 are the largest, so that the target electrical appliance 4 is in the maximum power state, and when the foreign object 5 is inserted, the power of the target electrical appliance 4 is gradually reduced, so that the sensing cavity has a good application prospect in some application occasions.
Specifically, the control module 3 further includes a second power supply 33 and an operational amplifier 34, the operational amplifier 34 is disposed between the first power supply 31, the voltage regulator circuit 221 and the target electrical appliance 4, the operational amplifier 34 is configured to generate a second electrical signal according to the first electrical signal, and the second electrical signal is configured to adjust an input current of the target electrical appliance 4.
Specifically, the operational amplifier 34 includes a power supply node 341, a positive phase node 342, an inverse phase node 343, a ground node 344, and an output node 345, wherein the positive phase node 342 is electrically connected to the voltage stabilizing circuit 221, the inverse phase node 343 is electrically connected to the comparing circuit 35, the power supply node 341 is electrically connected to the second power supply 33, the ground node 344 is connected to the ground, and the output node 345 is electrically connected to the target electrical appliance 4; the voltage stabilizing circuit 221 is configured to form a positive-phase voltage at the positive-phase node 342, the first electrical signal is configured to adjust the magnitude of the positive-phase voltage, the comparing circuit 35 is configured to form an inverted-phase voltage at the inverted-phase node 343, and the operational amplifier 34 is configured to compare the magnitudes of the positive-phase voltage and the inverted-phase voltage and generate a second electrical signal according to the comparison result; when the non-inverted voltage is greater than the inverted voltage, the second electrical signal is used to output a high voltage at the output node 345; when the positive phase voltage is greater than the negative phase voltage, the second electrical signal is used to output a low voltage at the output node 345.
In this embodiment, it should be noted that the operational amplifier 34 may adopt an LM358, and the operational amplifier 34 is disposed between the second power supply 33, the voltage stabilizing circuit 221 and the target electrical appliance 4, specifically, as shown in fig. 6, wherein the power supply node 341 is connected to the second power supply 33, the inverting node 343 is connected to the comparison circuit 35, the comparison circuit 35 inputs the inverted voltage at the inverting node 343, the non-inverting node 342 is connected to the voltage stabilizing circuit 221 and is located between the preset resistor 222 and the sensing unit 21, while the operational amplifier 34 is connected in parallel with the whole sensing unit 21, the ground node 344 is grounded, and the output node 345 is connected to the target electrical appliance 4. In operation, if the sensing unit 21 enters the foreign object 5 in the sensing cavity 11, the resistance of the sensing unit 21 increases, and V is equal to V on the premise that the resistance of the preset resistor 222 is constant b The positive phase voltage at the positive phase node 342 is increased, and according to the comparison principle of the operational amplifier 34, when the positive phase voltage is greater than the negative phase voltage, the high voltage is directly outputted at the output node 345, so as to control the conduction of the target electrical appliance 4, whereas, when the positive phase voltage is less than the negative phase voltage, the high voltage is outputted at the output nodeThe output voltage at 345 is low, and the target electrical appliance 4 is always in an off state.
It should be noted that, as shown in fig. 11, the non-inverting node 342 is connected to the voltage stabilizing circuit 221 and located between the preset resistor 222 and the sensing unit 21, but the operational amplifier 34 is connected in parallel with the whole preset resistor 222. When the sensing cavity 11 is operated, the resistance of the sensing unit 21 is reduced when the foreign object 5 is gradually removed from the sensing cavity 11, and V is set to be constant under the premise that the resistance of the preset resistor 222 is constant b Decrease, then V a Increase since the positive phase voltage now equals V a If the positive-phase voltage is greater than the negative-phase voltage, the comparison principle of the operational amplifier 34 is used, and if the positive-phase voltage is greater than the negative-phase voltage, the high voltage is directly output at the output node 345, so that the target electrical appliance 4 is turned on and controlled, whereas if the positive-phase voltage is less than the negative-phase voltage, the low voltage is output at the output node 345, and the target electrical appliance 4 is always in the off state.
Specifically, the sensing unit 21 includes an emitting end 211 and a receiving end 212, the emitting end 211 is configured to emit an optical signal toward the receiving end 212, the receiving end 212 is configured to change a self resistance value according to the received optical signal, and the voltage stabilizing circuit 221 is configured to change a voltage of the receiving end 212 after the receiving end 212 changes the self resistance value, so as to generate a first electrical signal.
In this embodiment, it should be noted that, preferably, the receiving end 212 is a photo resistor, and when receiving the optical signal emitted from the emitting end 211, the resistance value of the receiving end is decreased, and when the optical signal emitted from the emitting end 211 cannot be received, the resistance value of the receiving end is increased, so as to implement the subsequent control process.
Specifically, the receiving end 212 and the emitting end 211 are opposite to each other, and the sensing cavity 11 is located between the receiving end 212 and the emitting end 211.
In this embodiment, it should be noted that when the transmitting end 211 is directly facing the receiving end 212, and the foreign object 5 enters the sensing cavity 11 between the transmitting end 211 and the receiving end 212, the optical signal received by the receiving end 212 is immediately reduced, so as to implement high-sensitivity feedback and enable the subsequent control process to be smoothly performed. It should be noted that, in this arrangement, in a normal state, that is, when there is no foreign object 5 in the sensing cavity 11, the receiving terminal 212 always receives the maximum optical signal, and the resistance value of the receiving terminal 212 is at the maximum value, which means that the target electrical appliance 4 is at a certain critical value, for example, at a start state in a maximum power state, or at an off-stop state.
Specifically, the receiving end 212 and the transmitting end 211 are disposed at a different position, and the receiving end 212 is used for receiving the optical signal reflected by the foreign object 5 in the sensing cavity 11.
In this embodiment, it should be noted that, when the transmitting end 211 is not directly opposite to the receiving end 212, when the foreign object 5 enters the sensing cavity 11 between the transmitting end 211 and the receiving end 212, the foreign object reflects the optical signal emitted by the transmitting end 211, so that the receiving end 212 receives the optical signal, thereby implementing high-sensitivity feedback and enabling the subsequent control process to be performed smoothly. It should be noted that, in this arrangement, in a normal state, that is, when there is no foreign object 5 in the sensing cavity 11, the receiving terminal 212 does not receive the optical signal all the time, and the resistance value of the receiving terminal 212 is at the minimum value, thereby indicating that the target electrical appliance 4 is at a certain critical value, for example, at a start state in a maximum power state, or at an off-stop state.
Specifically, the induction module 2 includes a microwave controller 23, the control module 3 includes a third power supply 36, a second NPN transistor 37 and a switch circuit 38, the switch circuit 38 is electrically connected to the third power supply 36 and the microwave controller 23, and the second NPN transistor 37 is disposed between the switch circuit 38, the third power supply 36 and the target electrical appliance 4; the microwave controller 23 is configured to emit electromagnetic waves into the sensing cavity 11, receive an echo reflected by the foreign object 5 in the sensing cavity 11, and generate a first electrical signal after receiving the echo; the switching circuit 38 is configured to turn on or off the third power supply 36 and the second NPN transistor 37 after receiving the first electrical signal; the second NPN transistor 37 is configured to generate a second electrical signal according to the first electrical signal, and the second electrical signal is configured to adjust a current between the third power source 36 and the target electrical appliance 4 after the third power source 36 and the second NPN transistor 37 are turned on.
In the present embodiment, similarly, as shown in fig. 12 and 13, the microwave controller 23 laterally emits high frequency electromagnetic waves into the induction cavity 11, and receives echoes thereof to thereby induce movement of an object entering the induction cavity 11, and if a foreign object 5 enters, the microprocessor is triggered to execute instructions of the microwave controller 23 to control the switching circuit 38 to be turned on and off, and if the switching circuit 38 is turned off, the third power supply 36 and the second NPN transistor 37 are turned on, and further, under this condition, if the microwave controller 23 controls the base current of the second NPN transistor to be increased, the current between the collector and the emitter of the second NPN transistor is increased to increase the voltage current of the target electric appliance 4, thereby completing the on control, and conversely, if the microwave controller 23 controls the base current of the second NPN transistor to be decreased, the current between the collector and the emitter of the second NPN transistor is decreased, thereby decreasing the voltage current of the target electric appliance 4, thereby completing the off control.
It should be noted that the shape of the inner wall of the entire sensing cavity 11 can be freely set, and the opening formed by the concave part can be an ellipse, a circle, a polygon or an irregular shape, etc.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (7)
1. A concave embedded type cavity induction key system is characterized by comprising an installation body, an induction module, a control module and a target electrical appliance, wherein an induction cavity is formed at one end of the installation body in a concave mode, and the induction module is electrically connected with the control module; the induction module is arranged on the mounting body and used for generating a first electric signal after foreign matters enter the induction cavity, and the control module is used for generating a second electric signal according to the first electric signal, wherein the second electric signal is used for controlling the current connected to the target electrical appliance;
the induction module comprises an induction unit and a voltage regulation unit, the voltage regulation unit comprises a voltage stabilizing circuit and a preset resistor, and the induction unit and the preset resistor are connected in series on the voltage stabilizing circuit; the sensing unit is arranged in the sensing cavity, the sensing unit is used for changing the resistance value of the sensing unit after foreign matters enter the sensing cavity, and the voltage stabilizing circuit is used for changing the voltage of the sensing unit after the resistance value of the sensing unit is changed, so that a first electric signal is generated;
the control module comprises a first power supply and a first NPN triode, the first NPN triode is arranged among the first power supply, the voltage stabilizing circuit and the target electrical appliance, the first NPN triode is used for generating a second electrical signal according to the first electrical signal, and the second electrical signal is used for adjusting the current between the first power supply and the target electrical appliance;
the first NPN triode comprises a base electrode, a collector electrode and an emitter electrode, wherein the collector electrode is electrically connected with the first power supply, the emitter electrode is electrically connected with the target electric appliance, and the base electrode is electrically connected with the voltage stabilizing circuit; wherein,
the first NPN triode is used for changing the base voltage, and the first NPN triode is also used for generating a second electric signal after the base voltage is changed, and the second electric signal is also used for adjusting the current between the collector and the emitter.
2. The cavity-sensing key system as claimed in claim 1, wherein the control module further comprises a second power supply and an operational amplifier, the operational amplifier is disposed between the first power supply, the voltage regulator circuit and the target electrical appliance, the operational amplifier is configured to generate a second electrical signal according to the first electrical signal, and the second electrical signal is configured to regulate an input current of the target electrical appliance.
3. The cavity induction key system as claimed in claim 2, wherein the operational amplifier comprises a power node, a positive phase node, a negative phase node, a ground node and an output node, the positive phase node is electrically connected to the voltage stabilizing circuit, the negative phase node is electrically connected to the comparing circuit, the power node is electrically connected to the second power source, the ground node is connected to ground, and the output node is electrically connected to the target electrical device; wherein,
the voltage stabilizing circuit is used for forming a normal phase voltage at the normal phase node, the first electric signal is used for adjusting the magnitude of the normal phase voltage, the comparison circuit is used for forming an inverse phase voltage at the inverse phase node, and the operational amplifier is used for comparing the magnitudes of the normal phase voltage and the inverse phase voltage and generating a second electric signal according to a comparison result;
the second electrical signal is for outputting a high voltage at an output node when the positive phase voltage is greater than the negative phase voltage;
the second electrical signal is for outputting a low voltage at an output node when the positive phase voltage is greater than the reverse phase voltage.
4. The recessed embedded cavity induction key system according to any one of claims 1 to 3, wherein the induction unit comprises an emitting end and a receiving end, the emitting end is used for emitting light signals towards the receiving end, the receiving end is used for changing self resistance value according to the received light signals, and the voltage stabilizing circuit is used for changing voltage of the receiving end after the receiving end changes self resistance value, so as to generate first electric signals.
5. The recessed cavity sensor key system of claim 4, wherein the receiving end and the emitting end are opposite to each other, and the sensor cavity is located between the receiving end and the emitting end.
6. The recessed embedded cavity induction key system as claimed in claim 5, wherein the receiving end and the emitting end are disposed in a staggered manner, and the receiving end is used for receiving optical signals reflected by foreign objects in the induction cavity.
7. The cavity-in-the-recess inductive button system of claim 1, wherein the inductive module comprises a microwave controller, the control module comprises a third power source, a second NPN transistor, and a switching circuit, the switching circuit electrically connecting the third power source and the microwave controller, the second NPN transistor disposed between the switching circuit, the third power source, and the target appliance;
the microwave controller is used for transmitting electromagnetic waves into the induction cavity, receiving echoes reflected by foreign matters in the induction cavity and generating a first electric signal after receiving the echoes;
the switch circuit is used for switching on or switching off a third power supply and a second NPN triode after receiving the first electric signal;
the second NPN triode is used for generating a second electric signal according to the first electric signal, and the second electric signal is used for adjusting the current between a third power supply and the target electric appliance after the third power supply and the second NPN triode are connected.
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