Circuit for adjusting gesture sensing distance and household appliance

Abstract

The invention discloses a circuit for adjusting a gesture sensing distance and a household appliance. The circuit for adjusting the gesture sensing distance comprises a signal transmitting circuit, a voltage adjusting circuit and a controller. The signal transmitting circuit is used for controlling the infrared transmitting tube to emit light or extinguish, the voltage regulating circuit is used for regulating the voltage of the infrared transmitting tube, and the controller is connected with the negative electrode of the infrared transmitting tube through the signal transmitting circuit and is connected with the positive electrode of the infrared transmitting tube through the voltage regulating circuit. According to the invention, the controller is connected with the negative electrode of the infrared transmitting tube through the signal transmitting circuit and is connected with the positive electrode of the infrared transmitting tube through the voltage regulating circuit, and the voltage regulating circuit is used for regulating the voltage of the infrared transmitting tube and changing the current flowing through the infrared transmitting tube, so that the radiation intensity of the infrared transmitting tube is further changed; therefore, the user can adjust the gesture sensing distance according to own requirements, and the use experience of the user is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of gesture recognition and its application, and in particular, relates to a circuit and a household appliance for adjusting a gesture sensing distance. Background Art

[0002] With the improvement of living standards, people have a higher and higher demand for human-computer interaction, and the reliability, aesthetics and technological sense of human-computer interaction are increasingly concerned. At present, non-contact control range hoods using infrared signals have appeared on the market, but they all control the gesture sensing distance by controlling the intensity of the infrared signal. Since the infrared emission signal intensity of the existing range hoods is controlled by a fixed resistor after production, the current passing through the infrared emission tube remains unchanged, resulting in the infrared emission signal intensity being unadjustable, which further makes it impossible for users to adjust the gesture sensing distance according to their needs, reducing the user experience.

[0003] In view of this, the present invention is proposed. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art. The first purpose is to provide a circuit for adjusting the gesture sensing distance. The controller is connected to one end of the infrared emitting tube through a signal transmitting circuit, and is connected to the other end of the infrared emitting tube through a voltage regulating circuit. The voltage of the infrared emitting tube is adjusted by the voltage regulating circuit to change the current flowing through the infrared emitting tube, and further change the radiation intensity of the infrared emitting tube, thereby ensuring that the user can adjust the gesture sensing distance according to their needs and improving the user experience.

[0005] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0006] A circuit for adjusting gesture sensing distance, comprising:

[0007] The signal transmitting circuit is used to control the light emission or extinguishing of the infrared transmitting tube;

[0008] A voltage regulating circuit, used for regulating the voltage of the infrared emitting tube;

[0009] The controller is connected to the cathode of the infrared emitting tube through the signal emitting circuit and is connected to the anode of the infrared emitting tube through the voltage regulating circuit.

[0010] Preferably, the voltage regulating circuit includes a first signal amplifying circuit and a first signal converting circuit;

[0011] The first signal amplifying circuit is connected to the positive electrode of the infrared emitting tube through the first signal converting circuit;

[0012] Preferably, the base of the transistor Q2 in the first signal amplifying circuit is connected to the controller, the collector of the transistor Q2 is connected to the positive electrode of the infrared emitting tube through the first signal conversion circuit, and the emitter of the transistor Q2 is grounded.

[0013] Preferably, the first signal conversion circuit includes a power supply and a photocoupler IC1 connected to the power supply, the first output end of the photocoupler IC1 is connected to the collector of the transistor Q2, and the second output end of the photocoupler IC1 is connected to the positive electrode of the infrared emitting tube.

[0014] Preferably, the photocoupler IC1 includes a light-emitting element and a light-receiving element, the light-emitting element emits light through the current generated by the power supply, so that the light-receiving element generates a current for the infrared emitting tube to emit light;

[0015] Preferably, the light emitting element is a light emitting diode, and the light receiving element is a phototransistor.

[0016] Preferably, the power supply includes a first power supply Vpower and a second power supply Vpower-mcu, the first power supply Vpower is connected to the collector of the phototransistor, and the second power supply Vpower-mcu is connected to the light emitting diode;

[0017] Preferably, a resistor R3 is arranged between the second power supply Vpower-mcu and the light emitting diode.

[0018] Preferably, the voltage regulating circuit comprises a second signal amplifying circuit and a power supply Vpower1;

[0019] The base of the transistor PQ1 in the second signal amplifying circuit is connected to the controller, the collector of the transistor PQ1 is connected to the positive electrode of the infrared emitting tube, and the emitter of the transistor PQ1 is connected to the power supply Vpower1.

[0020] Preferably, the controller has a switch signal output terminal Output and a PWM signal output terminal, the switch signal output terminal Output is connected to the input terminal of the signal transmitting circuit, and the PWM signal output terminal is connected to the input terminal of the voltage regulating circuit.

[0021] Preferably, the circuit for adjusting the gesture sensing distance further includes a capacitor C2, one end of which is grounded, and the other end of which is connected between the positive electrode of the infrared emitting tube and the output end of the voltage regulating circuit.

[0022] Preferably, the circuit for adjusting the gesture sensing distance further includes a resistor R2, and the resistor R2 is arranged between the capacitor C2 and the positive electrode of the infrared emitting tube.

[0023] A second object of the present invention is to provide a household appliance for use in a circuit for adjusting a gesture sensing distance, wherein the household appliance has a control key for adjusting a voltage of an infrared emitting tube;

[0024] Preferably, the control key is arranged on a control panel of the household appliance; or the control key is arranged on a remote control terminal of the household appliance.

[0025] After adopting the above technical scheme, the present invention has the following beneficial effects compared with the prior art.

[0026] In the present invention, the controller is connected to the negative electrode of the infrared emitting tube through a signal transmitting circuit, and is connected to the positive electrode of the infrared emitting tube through a voltage regulating circuit. The voltage of the infrared emitting tube is adjusted by the voltage regulating circuit to change the current flowing through the infrared emitting tube, and further change the radiation intensity of the infrared emitting tube, thereby ensuring that the user can adjust the gesture sensing distance according to their needs and improving the user experience.

[0027] In the present invention, the controller has a switch signal output terminal Output and a PWM signal output terminal, the switch signal output terminal Output is connected to the input terminal of the signal transmitting circuit, and the PWM signal output terminal is connected to the input terminal of the voltage regulating circuit. Compared with the existing controller using two PWM signal output terminals, the design of the controller of the present invention is relatively reasonable, so that the controller resources are more effectively utilized. For devices that do not require PWM control, the use of the switch signal output terminal Output can reduce the occupation of PWM resources, especially in controllers with limited resources. The design of the present invention can significantly alleviate the situation of controller resource shortage.

[0028] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the accompanying drawings:

[0030] Figure 1 is a circuit diagram of an implementation of a circuit for adjusting a gesture sensing distance of the present invention;

[0031] Figure 2 It is a circuit diagram of another implementation of the circuit for adjusting the gesture sensing distance of the present invention.

[0032] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0034] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] like Figure 1 As shown, the present invention provides a circuit for adjusting gesture sensing distance. As an implementation mode of the present invention, the circuit includes a signal transmitting circuit, a voltage regulating circuit and a controller.

[0037] The controller includes a common port, namely a switch signal output terminal Output, which is connected to the input terminal of the signal transmitting circuit. The controller outputs a digital signal to the signal transmitting circuit through the switch signal output terminal Output to control the light emission or extinguishing of the infrared transmitting tube.

[0038] The controller also includes a PWM signal output end, which is connected to the input end of the voltage regulation circuit. The controller uses the PWM signal output end to output a PWM signal to the voltage regulation circuit, controls the voltage regulation circuit to adjust the voltage of the infrared emitting tube, and changes the current flowing through the infrared emitting tube, thereby ensuring that the user can adjust the gesture sensing distance according to their needs, thereby improving the user experience.

[0039] The controller of the present invention adopts a switch signal output terminal Output and a PWM signal output terminal, and the design is relatively reasonable, so that the controller resources are more effectively utilized. For devices that do not require PWM control, the use of the switch signal output terminal Output can reduce the occupation of PWM resources, especially in controllers with limited resources. The design of the present invention can significantly alleviate the situation of controller resource shortage. It can be understood that the controller resources include but are not limited to the number of pins, the number of timers, and the number of PWM channels.

[0040] Specifically, the signal transmitting circuit includes a resistor R1, a transistor NQ1 and a capacitor C1. The switch signal output terminal Output of the controller is connected to the base of the transistor NQ1 through the resistor R1, the collector of the transistor NQ1 is connected to the negative electrode of the infrared transmitting tube, the emitter of the transistor NQ1 is grounded, one end of the capacitor C1 is connected between the resistor R1 and the base of the transistor NQ1, and the other end of the capacitor C1 is connected between the emitter of the transistor NQ1 and the grounding point. That is, the controller generates a digital signal and outputs it through the switch signal output terminal Output, driving the transistor NQ1 to open and close, thereby controlling the infrared transmitting tube to emit light or extinguish.

[0041] Furthermore, the voltage regulation circuit includes a first signal amplification circuit and a first signal conversion circuit. The base of the transistor Q2 in the first signal amplification circuit is connected to the switch signal output terminal Output of the controller, the collector of the transistor Q2 is connected to the positive electrode of the infrared emitting tube through the signal conversion circuit, and the emitter of the transistor Q2 is grounded.

[0042] Furthermore, the first signal amplification circuit also includes a resistor R4 and a resistor R5, the resistor R4 is arranged between the base of the transistor Q2 and the switch signal output terminal Output of the controller, one end of the resistor R5 is connected between the resistor R4 and the base of the transistor Q2, and the other end is connected between the emitter of the transistor Q2 and the grounding point, that is, the first signal amplification circuit is designed as an NPN type circuit, which ensures that the circuit has a faster response speed and higher working efficiency.

[0043] In addition, the first signal conversion circuit includes a power supply and a photocoupler IC1 connected to the power supply, the first output end of the photocoupler IC1 is connected to the collector of the transistor Q2, and the second output end of the photocoupler IC1 is connected to the positive electrode of the infrared emitting tube. That is, the power supply is divided into two paths after passing through the photocoupler IC1, and the two circuits are configured and adjusted differently to meet different needs of users.

[0044] Furthermore, the photocoupler IC1 includes a light-emitting element and a light-receiving element, and the light-emitting element emits light through the current generated by the power supply, so that the light-receiving element generates a current for the infrared emitting tube to emit light. It can be understood that the light-emitting element is a light-emitting diode, and the light-receiving element is a phototransistor. The power supply includes a first power supply Vpower and a second power supply Vpower-mcu, the first power supply Vpower is connected to the collector of the phototransistor, and the second power supply Vpower-mcu is connected to the light-emitting diode. The present invention adopts a method of connecting the first power supply Vpower and the second power supply Vpower-mcu to the light-receiving element and the light-emitting element respectively, so as to realize the transmission of the optical signal generated by the light-emitting element to the light-receiving element, thereby causing the light-receiving element to generate an electrical signal, which can reduce the influence of electromagnetic interference on the circuit, and at the same time improve the overall anti-interference ability of the circuit, and further improve the safety and stability of the circuit.

[0045] In the prior art, a power supply is usually set. When the voltage of the power supply is set to be particularly large, although the current flowing through the infrared emitting tube can be changed by adjusting the voltage at both ends of the infrared emitting tube, the voltage of the infrared emitting tube is generally between 0-3.3V, which is much smaller than the voltage of the power supply. Therefore, even if the voltage of the infrared emitting tube is adjusted relative to the overall high-voltage power supply, the adjustment effect will be negligible. The design of the first power supply Vpower and the second power supply Vpower-mcu in the present invention can avoid the defects of the prior art. Even if the voltage of the first power supply Vpower is much larger than the second power supply Vpower-mcu, the voltage of the first power supply Vpower can adjust the voltage value according to its own design, thereby improving the effect of adjusting the voltage of the infrared emitting tube.

[0046] Furthermore, a resistor R3 is arranged between the second power supply Vpower-mcu and the light emitting diode to play a role of current limiting.

[0047] In addition, the circuit for adjusting the gesture sensing distance also includes a capacitor C2, one end of the capacitor C2 is grounded, and the other end is connected between the positive electrode of the infrared emitting tube and the output end of the voltage regulating circuit. That is to say, the controller generates a pulse width adjustment signal PWM signal, which is output through the PWM signal output end and charges the capacitor C2 through the output end of the voltage regulating circuit, thereby adjusting and maintaining the voltage V2 of the resistor R2, and finally adjusting the gesture sensing distance to ensure that the gesture sensing distance adjusted by the user conforms to the personal usage habits and improves the user's satisfaction and usage experience.

[0048] The circuit for adjusting the gesture sensing distance further includes a resistor R2, and the resistor R2 is arranged between the capacitor C2 and the positive electrode of the infrared emitting tube.

[0049] like Figure 2 As shown, as another embodiment of the present invention, the difference from the above embodiment is that the voltage regulating circuit includes a second signal amplifying circuit and a power supply Vpower1;

[0050] The base of the transistor PQ1 in the second signal amplifying circuit is connected to the controller, the collector of the transistor PQ1 is connected to the positive electrode of the infrared emitting tube, and the emitter of the transistor PQ1 is connected to the power supply Vpower1.

[0051] The second signal amplification circuit also includes a resistor R6 and a resistor R7, wherein the resistor R7 is disposed between the base of the transistor PQ1 and the switch signal output terminal Output of the controller, wherein one end of the resistor R6 is connected between the resistor R7 and the base of the transistor PQ1, and the other end is connected between the emitter of the transistor PQ1 and the power supply Vpower1, wherein the resistor R6 can limit the current passing through the transistor PQ1 to prevent the transistor PQ1 from being damaged due to overcurrent, and the resistor R6 can also provide a discharge circuit for the capacitor C2 to ensure that the circuit can quickly release the stored energy when the circuit is turned off or switched to avoid unnecessary interference or damage. It can be understood that the second signal amplification circuit is designed as a PNP type circuit, which is relatively low in cost.

[0052] In addition, the circuit for adjusting the gesture sensing distance also includes a signal receiving circuit, which is used to receive an electrical signal and transmit the received electrical signal to the controller. Specifically, when the signal receiving circuit receives an electrical signal of a specific frequency, it outputs a low level to the controller, and when the signal receiving circuit does not receive an electrical signal of a specific frequency, it outputs a high level to the controller. The controller determines whether an electrical signal is received by analyzing the high and low levels of the input. It can be understood that the controller is an MCU.

[0053] The present invention further provides a household appliance, including but not limited to a range hood, which is described by taking the range hood as an example.

[0054] The range hood comprises a shell, a control panel arranged on the shell and a fume exhaust system installed on the shell.

[0055] Specifically, the oil fume exhaust system includes an air duct, an exhaust device connected to the air duct, a wind wheel arranged in the air duct, a driving motor driving the wind wheel to rotate, and a check valve arranged in the air duct. The wind wheel is driven to rotate by the force provided by the driving motor, and the oil fume is introduced into the air duct, and then the oil fume is discharged outdoors after being filtered by the exhaust device connected to the air duct.

[0056] Furthermore, the smoke exhaust device includes a smoke exhaust pipe, one end of which is connected to the check valve at the end of the air duct, and the other end of which extends outdoors or is connected to a public flue; in addition, an oil collecting device and an oil guide member for guiding oil pollution into the oil collecting device are arranged in the housing. It is understandable that the above structure belongs to the prior art and will not be described in detail here.

[0057] Furthermore, a control key is provided on the control panel of the range hood, and the control key is used to adjust the electrical signal output to the voltage regulating circuit. That is, the user can increase or decrease the electrical signal through the control key, and finally adjust the gesture sensing distance.

[0058] As an alternative to setting the control key on the control panel, the control key can also be set on a remote control terminal connected to the range hood. The user increases or decreases the electrical signal by activating the control key on the remote control terminal.

[0059] In addition, the control keys are provided in plurality, and each control key corresponds to a different electrical signal, that is, when the user selects a different control key, the controller of the range hood can transmit the electrical signal corresponding to the control key to the voltage regulating circuit.

[0060] The present invention also provides a control method for the range hood, the control method comprising:

[0061] Start control key;

[0062] In response to the control key, the controller outputs an electrical signal to the voltage regulating circuit to regulate the voltage V2 of the resistor R2.

[0063] Furthermore, the method of adjusting the voltage V2 of the resistor R2 includes changing the duty cycle of the electrical signal. Specifically, when the user clicks the control key, the controller outputs a PWM signal, and at the same time, the controller calculates the time T1 of outputting the PWM signal within the unit time T, thereby calculating the duty cycle of the output PWM signal, and calculating the voltage V2 of the resistor R2, that is, the voltage of the infrared emitting tube, through the duty cycle.

[0064] by Figure 1For example, the duty cycle D of the output PWM signal is calculated by taking the voltage of the first power supply Vpower as 5V, D=(T1 / T)×100%, when D=50%, the voltage V2 of the resistor R2=5×50%, and the calculated V2 is 2.5V; when D=75%, the voltage V2 of the resistor R2=5×75%, and the calculated V2 is 3.75V; when D=20%, the voltage V2 of the resistor R2=5×20%, and the calculated V2 is 1V. It can be seen that the larger the duty cycle D of the output PWM signal, the larger the voltage V2 of the resistor R2, and conversely, the smaller the duty cycle D of the output PWM signal, the smaller the voltage V2 of the resistor R2.

[0065] In addition, the voltage V2 of the resistor R2 is adjusted, and then the gesture sensing distance is determined according to the adjusted voltage V2.

[0066] Further, according to the adjusted voltage V2, determining the gesture sensing distance specifically includes calculating the current I flowing through the infrared emitting tube according to the voltage V2. X , I X =(Vpower-V NQ1饱和压降 -V2) / R2. It is understandable that V NQ1饱和压降 It is fixed and can be found in the data sheet.

[0067] It should be noted that V NQ1饱和压降 It refers to the voltage difference between the collector and emitter of transistor NQ1 in saturation state.

[0068] Furthermore, based on the current I X Get the radiation intensity of the infrared transmitting tube;

[0069] The gesture sensing distance is determined according to the radiation intensity of the infrared transmitting tube.

[0070] Specifically, the radiation intensity of the infrared emitting tube is related to the current I X The gesture sensing distance is proportional to the radiation intensity of the infrared emitting tube. The current I X The larger the value, the stronger the radiation intensity of the infrared emitting tube and the greater the gesture sensing distance. That is to say, when the user selects the control key, the controller increases the duty cycle of the output PWM signal, thereby increasing the voltage V2 of the resistor R2, thereby weakening the signal strength of the infrared emitting tube and reducing the gesture sensing distance; the controller reduces the duty cycle of the output PWM signal, thereby reducing the voltage V2 of the resistor R2, thereby enhancing the signal strength of the infrared emitting tube and increasing the gesture sensing distance.

[0071] The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content suggested above without departing from the scope of the technical solution of the present invention. The implementation scheme in the above embodiment can also be further combined or replaced. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the solution of the present invention.

Claims

1. A circuit for adjusting gesture sensing distance, characterized in that: include, The signal transmitting circuit is used to control the light emission or extinguishing of the infrared transmitting tube; A voltage regulating circuit, used for regulating the voltage of the infrared emitting tube; The controller is connected to the cathode of the infrared emitting tube through the signal emitting circuit and is connected to the anode of the infrared emitting tube through the voltage regulating circuit.

2. The circuit for adjusting gesture sensing distance according to claim 1, characterized in that: The voltage regulating circuit includes a first signal amplifying circuit and a first signal converting circuit; The first signal amplifying circuit is connected to the positive electrode of the infrared emitting tube through the first signal converting circuit; Preferably, the base of the transistor Q2 in the first signal amplifying circuit is connected to the controller, the collector of the transistor Q2 is connected to the positive electrode of the infrared emitting tube through the first signal conversion circuit, and the emitter of the transistor Q2 is grounded.

3. The circuit for adjusting gesture sensing distance according to claim 2, characterized in that: The first signal conversion circuit includes a power supply and a photocoupler IC1 connected to the power supply, a first output end of the photocoupler IC1 is connected to the collector of the transistor Q2, and a second output end of the photocoupler IC1 is connected to the positive electrode of the infrared emitting tube.

4. The circuit for adjusting gesture sensing distance according to claim 3, characterized in that: The photocoupler IC1 includes a light-emitting element and a light-receiving element. The light-emitting element emits light through the current generated by the power supply, so that the light-receiving element generates a current for the infrared emitting tube to emit light. Preferably, the light emitting element is a light emitting diode, and the light receiving element is a phototransistor.

5. The circuit for adjusting gesture sensing distance according to claim 4, characterized in that: The power supply includes a first power supply Vpower and a second power supply Vpower-mcu, the first power supply Vpower is connected to the collector of the phototransistor, and the second power supply Vpower-mcu is connected to the light emitting diode; Preferably, a resistor R3 is arranged between the second power supply Vpower-mcu and the light emitting diode.

6. The circuit for adjusting gesture sensing distance according to claim 1, characterized in that: The voltage regulating circuit includes a second signal amplifying circuit and a power supply Vpower1; The base of the transistor PQ1 in the second signal amplifying circuit is connected to the controller, the collector of the transistor PQ1 is connected to the positive electrode of the infrared emitting tube, and the emitter of the transistor PQ1 is connected to the power supply Vpower1.

7. The circuit for adjusting gesture sensing distance according to any one of claims 1 to 6, characterized in that: The controller has a switch signal output terminal Output and a PWM signal output terminal. The switch signal output terminal Output is connected to the input terminal of the signal transmitting circuit, and the PWM signal output terminal is connected to the input terminal of the voltage regulating circuit.

8. The circuit for adjusting gesture sensing distance according to any one of claims 1 to 7, characterized in that: It also includes a capacitor C2, one end of which is grounded, and the other end of which is connected between the positive electrode of the infrared emitting tube and the output end of the voltage regulating circuit.

9. The circuit for adjusting gesture sensing distance according to claim 8, characterized in that: It also includes a resistor R2, which is arranged between the capacitor C2 and the positive electrode of the infrared emitting tube.

10. A household appliance, using the circuit for adjusting gesture sensing distance as claimed in any one of claims 1 to 9, characterized in that: The household appliance has a control key, and the control key is used to adjust the voltage of the infrared emitting tube; Preferably, the control key is arranged on a control panel of the household appliance; or the control key is arranged on a remote control terminal of the household appliance.

Images