Induction alarm circuit and induction alarm device

Abstract

The utility model discloses an induction alarm circuit and an induction alarm device. The induction alarm circuit comprises a power supply module; the input end of the signal amplification module is electrically connected with the power supply module; the input end of the voltage comparison module is electrically connected with the output end of the signal amplification module; and the alarm module is electrically connected with the output end of the voltage comparison module, and the alarm module is provided with a startup delay circuit. Through a startup time delay circuit arranged in the alarm module, the phenomena that the circuit or the device gives an alarm immediately after being started up, and false alarm, wrong alarm and excessive alarm occur when the circuit or the device is powered on after power failure are prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of intelligent household appliances, in particular to an induction alarm circuit and an induction alarm device. Background Art

[0002] The alarm induction of the smart home appliance induction alarm device in the prior art is not sensitive, and the induction alarm time is long, which causes false alarms and leads to low reliability of the induction alarm circuit. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes an induction alarm circuit and an induction alarm device, which can reduce the duration of the induction alarm.

[0004] On the one hand, the induction alarm circuit according to the embodiment of the utility model includes:

[0005] Power supply module;

[0006] A signal amplifying module, wherein an input end of the signal amplifying module is electrically connected to the power supply module;

[0007] A voltage comparison module, wherein an input end of the voltage comparison module is electrically connected to an output end of the signal amplification module;

[0008] An alarm module is electrically connected to the output end of the voltage comparison module, and the alarm module is provided with a power-on delay circuit.

[0009] According to some embodiments of the utility model, the signal amplification module is provided with a first chip, and the signal amplification module includes a first amplification circuit and a second amplification circuit. The first amplification circuit is provided with a first triode, a first capacitor, a second capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor. One end of the first capacitor and one end of the first resistor are connected to the second pin of the first chip, the other end of the first resistor, the emitter of the first triode and one end of the sixth resistor are connected to the third pin of the first chip, the other end of the first capacitor and one end of the second resistor are connected to the base of the first triode, the other end of the second resistor, one end of the third resistor and the collector of the first triode are connected to one end of the second capacitor, the other end of the second capacitor is connected to one end of the fourth resistor, the other end of the fourth resistor, one end of the fifth resistor and the other end of the sixth resistor are connected to the second amplification circuit, and the other end of the third resistor and the other end of the fifth resistor are connected to the first pin of the first chip.

[0010] According to some embodiments of the utility model, the second amplifier circuit includes a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a first operational amplifier, a third capacitor, a fourth capacitor, a fifth capacitor and a first diode, one end of the seventh resistor, one end of the eighth resistor and one end of the fourth capacitor are all connected to the negative input terminal of the first operational amplifier, the other end of the seventh resistor is connected to one end of the third capacitor, the other end of the third capacitor is respectively connected to one end of the ninth resistor and the cathode of the first diode, the other end of the eighth resistor, the other end of the fourth capacitor and one end of the fifth capacitor are all connected to the output terminal of the first operational amplifier, the other end of the fifth capacitor is respectively connected to the other end of the ninth resistor, one end of the tenth resistor is connected to the anode of the first diode, and the other end of the tenth resistor and the other end of the fifth resistor are connected to the first amplifier circuit.

[0011] According to some embodiments of the utility model, the voltage comparison module includes a first voltage comparison circuit and a second voltage comparison circuit, the first voltage comparison circuit is connected to the signal amplification module, the first voltage comparison circuit is provided with an eleventh resistor, a twelfth resistor and a second operational amplifier, one end of the eleventh resistor, one end of the twelfth resistor and the negative input terminal of the second operational amplifier are all connected to the signal amplification module, the other end of the eleventh resistor and the other end of the twelfth resistor are both connected to the positive input terminal of the second operational amplifier, and the output terminal of the second operational amplifier is connected to the second voltage comparison circuit.

[0012] According to some embodiments of the utility model, the second voltage comparison circuit is provided with a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, an infrared detection sensor, a second diode and a sixth capacitor, one end of the sixth capacitor, one end of the thirteenth resistor, one end of the fourteenth resistor, one end of the fifteenth resistor and one end of the sixteenth resistor are all connected to the first voltage comparison circuit, the other end of the sixteenth resistor and the other end of the fifteenth resistor are both connected to the positive input terminal of the infrared detection sensor, the other end of the thirteenth resistor is connected to the cathode of the second diode, the other end of the fourteenth resistor, the negative input terminal of the infrared detection sensor and the other end of the sixth capacitor are all connected to the anode of the second diode, and the output end of the infrared detection sensor is connected to the alarm module.

[0013] According to some embodiments of the utility model, the alarm module is provided with an alarm circuit, and the alarm circuit is provided with a second chip, a second triode, a third diode, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a seventh capacitor and a speaker, one end of the seventeenth resistor, one end of the eighteenth resistor and one end of the nineteenth resistor are all connected to the output end of the second operational amplifier, the element of the seventeenth resistor and one end of the seventh capacitor are all connected to the third pin of the second chip, the other end of the seventh capacitor and the second pin of the second chip are both grounded, the first pin of the second chip is connected to one end of the speaker, the other end of the speaker is connected to the collector of the second triode, the other end of the eighteenth resistor is connected to the base of the second triode, the emitter of the second triode is connected to the delay circuit, the other end of the nineteenth resistor is connected to the anode of the third diode, the cathode of the third diode is connected to the delay circuit, and the other end of the seventeenth resistor is connected to the second voltage comparison circuit.

[0014] According to some embodiments of the utility model, the delay circuit is provided with a third diode, a twentieth resistor, an eighth capacitor, a third triode and a fourth diode, the collector of the third triode is connected to the cathode of the third diode, one end of the eighth capacitor is connected to the other end of the speaker, the other end of the eighth capacitor and one end of the twentieth resistor are both connected to the cathode of the fourth diode, the other end of the twentieth resistor is connected to the base of the third triode, and the emitter of the third triode and the anode of the fourth diode are both grounded.

[0015] The utility model also provides an induction alarm device, comprising the induction alarm circuit as described in any one of the above embodiments.

[0016] According to the induction alarm circuit and the induction alarm device of the embodiment of the utility model, at least the following are provided:

[0017] Beneficial effects:

[0018] A power supply module; a signal amplification module, the input end of the signal amplification module is electrically connected to the power supply module; a voltage comparison module, the input end of the voltage comparison module is electrically connected to the output end of the signal amplification module; an alarm module, the alarm module is electrically connected to the output end of the voltage comparison module, and the alarm module is provided with a power-on delay circuit. The power-on delay circuit provided in the alarm module can prevent the circuit or device from alarming immediately after being turned on, and prevent false alarms, wrong alarms and multiple alarms from occurring when power is restored after a power outage.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 This is a schematic diagram of the structure of the induction alarm circuit of an embodiment of the utility model;

[0022] Figure 2 The figure is a circuit diagram of the induction alarm circuit according to an embodiment of the utility model.

[0023] Reference numerals:

[0024] A first chip U1; a second chip U2; a first operational amplifier IC1; a second operational amplifier IC2; and an infrared detection sensor IC3. DETAILED DESCRIPTION

[0025] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0026] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0027] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0028] A power supply module 100; a signal amplifying module 200, the input end of the signal amplifying module 200 is electrically connected to the power supply module 100; a voltage comparison module 300, the input end of the voltage comparison module 300 is electrically connected to the output end of the signal amplifying module 200; an alarm module 400, the alarm module 400 is electrically connected to the output end of the voltage comparison module 300, and the alarm module 400 is provided with a power-on delay circuit. It should be noted that the power supply module 100 is used to provide power for the induction alarm circuit to ensure the normal operation of each module and meet the working voltage requirements of each module. The signal amplifying module 200 is used to amplify the signal input by the power supply module 100, thereby enhancing the amplitude or power of the signal and improving the power supply reliability. This embodiment sets a power-on delay circuit in the alarm module 400 to prevent the circuit or device from alarming immediately after startup, and prevents false alarms, wrong alarms and multiple alarms from occurring when power is restored after a power outage.

[0029] The signal amplification module 200 is provided with a first chip U1, and the signal amplification module 200 includes a first amplification circuit and a second amplification circuit. The first amplification circuit is provided with a first triode, a first capacitor, a second capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor. One end of the first capacitor and one end of the first resistor are connected to the second pin of the first chip U1, the other end of the first resistor, the emitter of the first triode and one end of the sixth resistor are connected to the third pin of the first chip U1, the other end of the first capacitor and one end of the second resistor are connected to the base of the first triode, the other end of the second resistor, one end of the third resistor and the collector of the first triode are connected to one end of the second capacitor, the other end of the second capacitor is connected to one end of the fourth resistor, the other end of the fourth resistor, one end of the fifth resistor and the other end of the sixth resistor are connected to the second amplification circuit, and the other end of the third resistor and the other end of the fifth resistor are connected to the first pin of the first chip U1. It should be noted that the signal amplification module 200 drives the voltage comparison module 300 and the alarm module 400 by amplifying the model input by the power supply module 100, thereby triggering the alarm module 400 to alarm. The first amplification circuit amplifies the input signal through components such as the first transistor, and performs high-gain, low-noise amplification through the second amplification circuit, thereby enhancing the signal amplitude while ensuring the quality of the input signal, ensuring that the voltage comparison module 300 and the alarm module 400 can be reliably triggered.

[0030] The second amplifier circuit includes a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a first operational amplifier IC1, a third capacitor, a fourth capacitor, a fifth capacitor and a first diode, one end of the seventh resistor, one end of the eighth resistor and one end of the fourth capacitor are all connected to the negative input terminal of the first operational amplifier IC1, the other end of the seventh resistor is connected to one end of the third capacitor, the other end of the third capacitor is respectively connected to one end of the ninth resistor and the cathode of the first diode, the other end of the eighth resistor, the other end of the fourth capacitor and one end of the fifth capacitor are all connected to the output terminal of the first operational amplifier IC1, the other end of the fifth capacitor is respectively connected to the other end of the ninth resistor, one end of the tenth resistor is connected to the anode of the first diode, and the other end of the tenth resistor and the other end of the fifth resistor are connected to the first amplifier circuit. It should be noted that when the infrared detection sensor of the second amplifier circuit detects the infrared signal radiated by the human body, a weak electrical signal is outputted from the second pin of the infrared detection sensor, which is amplified by the first transistor and other components of the first amplifier circuit, and then input to the first operational amplifier IC1 through the second capacitor for high gain and low noise amplification.

[0031] The voltage comparison module 300 includes a first voltage comparison circuit and a second voltage comparison circuit. The first voltage comparison circuit is connected to the signal amplification module 200. The first voltage comparison circuit is provided with an eleventh resistor, a twelfth resistor and a second operational amplifier IC2. One end of the eleventh resistor, one end of the twelfth resistor and the negative input end of the second operational amplifier IC2 are all connected to the signal amplification module 200. The other end of the eleventh resistor and the other end of the twelfth resistor are all connected to the positive input end of the second operational amplifier IC2. The output end of the second operational amplifier IC2 is connected to the second voltage comparison circuit. It should be noted that the fifth pin of the second operational amplifier IC2 is provided with a reference voltage by the fourth resistor and the first diode. When the signal output from the output end of the second operational amplifier IC2 is sent to the negative input end of the third operational amplifier, the voltage of the first chip U1 and the input end of the second operational amplifier IC2 are compared. At this time, the output end of the second operational amplifier IC2 changes from the original high level to the low level.

[0032] The second voltage comparison circuit is provided with a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, an infrared detection sensor IC3, a second diode and a sixth capacitor. One end of the sixth capacitor, one end of the thirteenth resistor, one end of the fourteenth resistor, one end of the fifteenth resistor and one end of the sixteenth resistor are all connected to the first voltage comparison circuit. The other end of the sixteenth resistor and the other end of the fifteenth resistor are all connected to the positive input end of the third operational amplifier. The other end of the thirteenth resistor is connected to the cathode of the second diode. The other end of the fourteenth resistor, the negative input end of the infrared detection sensor IC3 and the other end of the sixth capacitor are all connected to the anode of the second diode. The output end of the infrared detection sensor IC3 is connected to the alarm module 400. Among them, the first chip U1 is an alarm delay chip, the fourteenth resistor and the sixth capacitor form a delay circuit, the delay time of the delay circuit is 1 minute, and when the seventh pin of the third operational amplifier becomes a low level, the sixth capacitor is discharged through the second diode. At this time, the second pin of the first chip U1 becomes a low level, and the low level of the second pin of the first chip U1 is compared with the reference voltage of the third pin of the first chip U1. When the level of the second pin is lower than the reference voltage of the third pin, the first pin of the first chip U1 becomes a high level. At this time, the second transistor is turned on.

[0033] The alarm module 400 is provided with an alarm circuit, which is provided with a second chip U2, a second triode, a third diode, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a seventh capacitor and a speaker, one end of the seventeenth resistor, one end of the eighteenth resistor and one end of the nineteenth resistor are all connected to the output end of the third operational amplifier, one end of the seventeenth resistor and one end of the seventh capacitor are all connected to the third pin of the second chip U2, the other end of the seventh capacitor and the second pin of the first chip U1 are both grounded, the first pin of the second chip U2 is connected to one end of the speaker, the other end of the speaker is connected to the collector of the second triode, the other end of the eighteenth resistor is connected to the base of the second triode, the emitter of the second triode is connected to the delay circuit, the other end of the nineteenth resistor is connected to the anode of the third diode, the cathode of the third diode is connected to the delay circuit, and the other end of the seventeenth resistor is connected to the second voltage comparison circuit. It should be noted that the second chip U2 is a voltage comparator. By setting a delay circuit, the function of delayed triggering of the alarm is realized. When the alarm condition is met, the delay circuit will trigger the alarm after a delay of a period of time. After the second chip U2 receives the output signal of the infrared detection sensor IC3, it is amplified through the seventeenth resistor, the eighteenth resistor and the nineteenth resistor, thereby enhancing the alarm signal to ensure that the alarm of the speaker can be perceived in enough time. The other end of the seventeenth resistor is connected to the second voltage comparison circuit to compare the voltage with the set threshold. When the input signal exceeds or is lower than the set threshold, the second chip U2 triggers the corresponding alarm action to make the speaker alarm. In addition, when the second transistor is turned on, the speaker is powered on to emit an alarm sound, thereby transmitting the alarm signal to the outside world, further enhancing the accuracy and perceptibility of the induction alarm circuit.

[0034] When the infrared signal of the human body disappears, the seventh pin of the infrared detection sensor IC3 resumes high-level output, and the second diode is cut off at this time. Since the voltage across the second capacitor cannot change suddenly, the sixth capacitor is slowly charged through the fourteenth resistor. When the voltage across the sixth capacitor is higher than the reference voltage, the first pin of the fourth operational amplifier becomes a low level for about one minute, that is, the alarm module 400 continues to alarm for one minute.

[0035] The delay circuit is provided with a third diode, a twentieth resistor, an eighth capacitor, a third triode and a fourth diode, the collector of the third triode is connected to the cathode of the third diode, one end of the eighth capacitor is connected to the other end of the speaker, the other end of the eighth capacitor and one end of the twentieth resistor are both connected to the cathode of the fourth diode, the other end of the twentieth resistor is connected to the base of the third triode, and the emitter of the third triode and the anode of the fourth diode are both grounded. It should be noted that the power-on delay circuit composed of the third diode, the twentieth resistor and the eighth capacitor can be set to a delay time of thirty seconds to prevent the user from immediately alarming after turning on the machine, and to prevent false alarms, wrong alarms and multiple alarms when a call comes back after a power outage.

[0036] In addition, an embodiment of the present application further provides an induction alarm device, which includes the induction alarm circuit described in any of the above embodiments.

[0037] In the description of this specification, the description with reference to the terms "one embodiment", "further embodiments", "some specific embodiments" or "some examples" etc. means that the specific features, structures or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0038] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An induction alarm circuit, characterized in that: include: Power supply module; A signal amplifying module, wherein an input end of the signal amplifying module is electrically connected to the power supply module; A voltage comparison module, wherein an input end of the voltage comparison module is electrically connected to an output end of the signal amplification module; An alarm module is electrically connected to the output end of the voltage comparison module, and the alarm module is provided with a power-on delay circuit.

2. The induction alarm circuit according to claim 1, characterized in that: The signal amplification module is provided with a first chip, and the signal amplification module includes a first amplification circuit and a second amplification circuit. The first amplification circuit is provided with a first triode, a first capacitor, a second capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor. One end of the first capacitor and one end of the first resistor are connected to the second pin of the first chip, the other end of the first resistor, the emitter of the first triode and one end of the sixth resistor are connected to the third pin of the first chip, the other end of the first capacitor and one end of the second resistor are connected to the base of the first triode, the other end of the second resistor, one end of the third resistor and the collector of the first triode are connected to one end of the second capacitor, the other end of the second capacitor is connected to one end of the fourth resistor, the other end of the fourth resistor, one end of the fifth resistor and the other end of the sixth resistor are connected to the second amplification circuit, and the other end of the third resistor and the other end of the fifth resistor are connected to the first pin of the first chip.

3. The induction alarm circuit according to claim 2, characterized in that: The second amplifier circuit includes a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a first operational amplifier, a third capacitor, a fourth capacitor, a fifth capacitor and a first diode. One end of the seventh resistor, one end of the eighth resistor and one end of the fourth capacitor are all connected to the negative input terminal of the first operational amplifier, the other end of the seventh resistor is connected to one end of the third capacitor, the other end of the third capacitor is respectively connected to one end of the ninth resistor and the cathode of the first diode, the other end of the eighth resistor, the other end of the fourth capacitor and one end of the fifth capacitor are all connected to the output terminal of the first operational amplifier, the other end of the fifth capacitor is respectively connected to the other end of the ninth resistor, one end of the tenth resistor is connected to the anode of the first diode, and the other end of the tenth resistor and the other end of the fifth resistor are connected to the first amplifier circuit.

4. The induction alarm circuit according to claim 1, characterized in that: The voltage comparison module includes a first voltage comparison circuit and a second voltage comparison circuit, the first voltage comparison circuit is connected to the signal amplification module, the first voltage comparison circuit is provided with an eleventh resistor, a twelfth resistor and a second operational amplifier, one end of the eleventh resistor, one end of the twelfth resistor and the negative input end of the second operational amplifier are all connected to the signal amplification module, the other end of the eleventh resistor and the other end of the twelfth resistor are both connected to the positive input end of the second operational amplifier, and the output end of the second operational amplifier is connected to the second voltage comparison circuit.

5. The induction alarm circuit according to claim 4, characterized in that: The second voltage comparison circuit is provided with a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, an infrared detection sensor, a second diode and a sixth capacitor, one end of the sixth capacitor, one end of the thirteenth resistor, one end of the fourteenth resistor, one end of the fifteenth resistor and one end of the sixteenth resistor are all connected to the first voltage comparison circuit, the other end of the sixteenth resistor and the other end of the fifteenth resistor are both connected to the positive input terminal of the infrared detection sensor, the other end of the thirteenth resistor is connected to the cathode of the second diode, the other end of the fourteenth resistor, the negative input terminal of the infrared detection sensor and the other end of the sixth capacitor are all connected to the anode of the second diode, and the output end of the infrared detection sensor is connected to the alarm module.

6. The induction alarm circuit according to claim 5, characterized in that: The alarm module is provided with an alarm circuit, which is provided with a second chip, a second triode, a third diode, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a seventh capacitor and a speaker, one end of the seventeenth resistor, one end of the eighteenth resistor and one end of the nineteenth resistor are all connected to the output end of the second operational amplifier, the element of the seventeenth resistor and one end of the seventh capacitor are all connected to the third pin of the second chip, the other end of the seventh capacitor and the second pin of the second chip are both grounded, the first pin of the second chip is connected to one end of the speaker, the other end of the speaker is connected to the collector of the second triode, the other end of the eighteenth resistor is connected to the base of the second triode, the emitter of the second triode is connected to the delay circuit, the other end of the nineteenth resistor is connected to the anode of the third diode, the cathode of the third diode is connected to the delay circuit, and the other end of the seventeenth resistor is connected to the second voltage comparison circuit.

7. The induction alarm circuit according to claim 6, characterized in that: The delay circuit is provided with a third diode, a twentieth resistor, an eighth capacitor, a third triode and a fourth diode, the collector of the third triode is connected to the cathode of the third diode, one end of the eighth capacitor is connected to the other end of the speaker, the other end of the eighth capacitor and one end of the twentieth resistor are both connected to the cathode of the fourth diode, the other end of the twentieth resistor is connected to the base of the third triode, and the emitter of the third triode and the anode of the fourth diode are both grounded.

8. An induction alarm device, characterized in that: include: An induction alarm circuit as claimed in any one of claims 1 to 7.

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