Circuit with active alarm protection function

Abstract

The utility model is suitable for the technical field of circuit protection, and relates to an active circuit with alarm protection, which comprises a power supply XS1, a resistor R1, a passive control circuit, an indicating lamp LED1 and a switching tube Q1, the passive control circuit comprises a resistor R2, a capacitor C1 and a triode V1, the positive electrode of the power supply XS1 is connected with one end of the resistor R1 and the emitting electrode of the triode V1, the other end of the resistor R1 is connected with the source electrode of the switch tube Q1 and the base electrode of the triode V1, the collector electrode of the triode V1 is connected with one end of the indicator lamp LED1, and the other end of the indicator lamp LED1 is connected with the power supply XS1. The other end of the indicating lamp LED1 is connected with the capacitor C1, the grid electrode of the switch tube Q1 and one end of the resistor R2. The negative electrode of the power supply XS1 is connected with the other end of the capacitor C1 and the other end of the resistor R2. The device is simple in structure, low in cost and small in size, can actively carry out passive disconnection protection before a power supply battery and equipment are damaged when power consumption is too large, gives an alarm prompt to a user, and is high in working efficiency and safety performance.

Description

Technical Field

[0001] The utility model belongs to the technical field of circuit protection, and in particular relates to a circuit with active alarm protection. Background Art

[0002] With the development of microelectronics technology in the 21st century, electronic products are becoming increasingly colorful and have become a necessity in people's lives. However, in the process of use, accidents may occur due to uneven product quality. For example, in actual applications, water meters and other equipment may consume too much power under abnormal conditions, which may directly damage the power supply battery and equipment. In more serious cases, fires may occur due to overheating, threatening people's lives and property.

[0003] Although electronic products always have a lifespan and are inevitably damaged, if an alarm can be given before damage occurs and abnormal equipment is disconnected, it will greatly improve the customer experience. Similarly, if the electronic products are manufactured in the factory and there are abnormal conditions such as short circuits, if the protection can be automatically disconnected and an alarm can be given, the production pass rate will be greatly improved. Figure 2 As shown, the relay state is controlled by an active control circuit. Under abnormal circumstances of high power consumption, the active control circuit controls the relay to disconnect the protection. However, the active control circuit is powered by an independent power supply, which is relatively expensive and not suitable for the cost requirements of water meters and micro-power electronic products. The relay and the active part of the circuit are designed to be large in size and not suitable for the space requirements of water meters and micro-power electronic products. In addition, there is no alarm prompt function, and it is difficult for users to detect abnormal conditions of the product. The patent with announcement number CN206517381U provides an I-type three-level protection circuit, including a gate protection circuit, an active clamping protection circuit, a short-circuit protection circuit and a driving and soft-off protection circuit; the short-circuit protection circuit is connected to the collector of the IGBT and is connected in series with the driving and soft-off circuit, the gate protection circuit is connected in series between the driving and soft-off circuit and the gate of the IGBT, and the active clamping protection circuit is arranged between the gate and the collector of the IGBT; the gate protection circuit controls the opening and closing of the IGBT; the active clamping protection circuit is used to suppress the overvoltage stress when the IGBT is turned off; the short-circuit protection circuit is used to first turn off the IGBTs at both ends of the I-type three-level inverter circuit when the IGBT is short-circuited, and then turn off the middle IGBT; the driving and soft-off protection circuit is used to drive the IGBT and realize the soft opening and soft shutoff of the IGBT. This patent is controlled and protected by an active circuit, which is costly and large in size. In addition, this patent cannot realize alarm prompts, and has the same disadvantages as the prior art.

[0004] Therefore, how to provide a protection circuit with low cost, small size and the ability to give an alarm under abnormal conditions is an urgent problem to be solved by personnel in the field of this technology. Utility Model Content

[0005] In view of the deficiencies of the prior art, the purpose of the utility model is to provide a circuit with active alarm protection to solve the problems of high cost, large size and inability to alarm in abnormal situations of the active protection circuit in the prior art.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] The utility model provides a circuit with active alarm protection, comprising:

[0008] Power supply XS1, resistor R1, passive control circuit, indicator LED1 and switch tube Q1;

[0009] The passive control circuit includes a resistor R2, a capacitor C1 and a transistor V1, the positive electrode of the power supply XS1 is connected to one end of the resistor R1 and the emitter of the transistor V1 respectively, the other end of the resistor R1 is connected to the source of the switch tube Q1 and the base of the transistor V1 respectively, the collector of the transistor V1 is connected to one end of the indicator light LED1, the other end of the indicator light LED1 is connected to the capacitor C1, the gate of the switch tube Q1 and one end of the resistor R2 respectively, and the negative electrode of the power supply XS1 is connected to the other end of the capacitor C1 and the other end of the resistor R2 respectively.

[0010] Furthermore, a super capacitor C2 is included, one end of the super capacitor C2 is connected to the drain of the switch tube Q1, and the other end of the super capacitor C2 is connected to the negative electrode of the power supply XS1 and grounded.

[0011] Furthermore, the power source XS1 is a 3.6V lithium-ion battery.

[0012] Furthermore, the resistance value of the resistor R1 is 51Ω, and the resistance value of the resistor R2 is 1KΩ.

[0013] Furthermore, the capacitance of the capacitor C1 is 1 uF.

[0014] Furthermore, the capacity of the super capacitor C2 is 50F and the voltage is 3.8V.

[0015] Furthermore, the model of the switch tube Q1 is IRLML5203 / SOT23.

[0016] Furthermore, the model of the transistor V1 is LMBT4403LT1G / SOT23.

[0017] Furthermore, the model of the indicator light LED1 is KNR0805B0.8W-C.

[0018] Compared with the prior art, the active alarm protection circuit provided by the utility model has at least the following advantages:

[0019] Beneficial effects:

[0020] The existing application scheme on the market is to control the relay state through an active control circuit. In the abnormal situation of high power consumption, the active control circuit controls the relay to disconnect the protection. However, the active control circuit has an independent power supply, which is relatively expensive and not suitable for the cost requirements of water meters and micro-power electronic products. The relay and the active part of the circuit design are large in size, which is not suitable for the space requirements of water meters and micro-power electronic products. In addition, there is no alarm prompt function, and it is difficult for users to detect abnormal situations of the product. The utility model has a simple structure, low cost and small size. Through the passive control circuit designed, it can actively perform passive disconnection protection before the power supply battery and equipment are damaged when the power consumption is too large, which can protect the load board and give the user an alarm prompt, with high work efficiency and safety performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the scheme of the utility model, a brief introduction is given below to the figures required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A circuit diagram of a circuit with active alarm protection provided by an embodiment of the utility model;

[0023] Figure 2 It is a schematic diagram of an active protection circuit application solution in the prior art;

[0024] Figure 3 A schematic diagram of an active circuit application scheme with alarm protection provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0025] Unless otherwise defined, all technical and scientific terms used in this document have the same meaning as commonly understood by technicians in the technical field of the present invention; the terms used in this specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. For example, the directions or positions indicated by terms such as "length", "width", "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", and "outside" are based on the directions or positions shown in the drawings, which are only for the convenience of description and cannot be understood as limitations on the present technical solution.

[0026] The terms "including" and "having" and any variations thereof in the specification and claims of the utility model and the above-mentioned drawings are intended to cover non-exclusive inclusions; the terms "first", "second", etc. in the specification and claims of the utility model or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In the specification and claims of the utility model and the above-mentioned drawings, when an element is referred to as "fixed to" or "mounted on" or "disposed on" or "connected to" another element, it may be directly or indirectly located on the other element. For example, when an element is referred to as "connected to" another element, it may be directly or indirectly connected to the other element.

[0027] In addition, the reference to "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0028] The utility model provides a circuit with active alarm protection, which is applied to the abnormality detection process of Internet of Things water meters or micro-power electronic products. The circuit with active alarm protection includes:

[0029] A power supply XS1, a resistor R1, a passive control circuit, an indicator light LED1 and a switch tube Q1; the passive control circuit includes a resistor R2, a capacitor C1 and a transistor V1, the positive electrode of the power supply XS1 is connected to one end of the resistor R1 and the emitter of the transistor V1 respectively, the other end of the resistor R1 is connected to the source of the switch tube Q1 and the base of the transistor V1 respectively, the collector of the transistor V1 is connected to one end of the indicator light LED1, the other end of the indicator light LED1 is connected to the capacitor C1, the gate of the switch tube Q1 and one end of the resistor R2 respectively, and the negative electrode of the power supply XS1 is connected to the other end of the capacitor C1 and the other end of the resistor R2 respectively.

[0030] The utility model has a simple structure, low cost and small size. It can actively perform passive disconnection protection before the power supply battery and equipment are damaged when the power consumption is too large, and give the user an alarm prompt, with high working efficiency and safety performance.

[0031] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiments of the utility model will be clearly and completely described below in conjunction with the accompanying drawings.

[0032] The utility model provides a circuit with active alarm protection, which is applied to the abnormal detection process of IoT water meters or micro-power electronic products. Figure 1 and Figure 3 In this embodiment, the active alarm protection circuit includes:

[0033] Power supply XS1, resistor R1, passive control circuit, indicator LED1, switch tube Q1 and super capacitor C2. Power supply XS1 is a 3.6V lithium-ion battery. The resistance of resistor R1 is 51Ω, the resistance of resistor R2 is 1KΩ, the capacitance of capacitor C1 is 1uF, the model of switch tube Q1 is IRLML5203 / SOT23, the model of transistor V1 is LMBT4403LT1G / SOT23, the model of indicator LED1 is KNR0805B0.8W-C, and super capacitor C2 is used as a load with a capacity of 50F and a voltage of 3.8V, which can meet the maximum load NB-IOT reporting requirements of the IoT water meter. During normal operation, the static working current is less than 3mA, and the large current required by the load is powered by super capacitor C2 (the capacitance of super capacitor C2 can be replaced to meet the load requirements). Specifically, the passive control circuit includes a resistor R2, a capacitor C1 and a transistor V1, the positive electrode of the power supply XS1 is connected to one end of the resistor R1 and the emitter of the transistor V1 respectively, the other end of the resistor R1 is connected to the source of the switch tube Q1 and the base of the transistor V1 respectively, the collector of the transistor V1 is connected to one end of the indicator light LED1, the other end of the indicator light LED1 is connected to the capacitor C1, the gate of the switch tube Q1, and one end of the resistor R2 respectively, the negative electrode of the power supply XS1 is connected to the other end of the capacitor C1 and the other end of the resistor R2 respectively, one end of the super capacitor C2 is connected to the drain of the switch tube Q1, and the other end of the super capacitor C2 is connected to the negative electrode of the power supply XS1 and grounded.

[0034] The following describes the working process of a circuit with active alarm protection provided by an embodiment of the utility model:

[0035] When the water meter is working normally, the static working current is less than 3mA, and the voltage flowing through the resistor R1 is not enough to turn on the transistor V1, and the indicator LED1 is not on; the switch tube Q1 uses a PMOS tube, and the circuit through the resistor R2 meets the V(GS) requirement, the switch tube Q1 is turned on, and the power supply XS1 supplies power to the super capacitor C2 and the load;

[0036] When the power consumption of the water meter is abnormal, when the voltage across the resistor R1 is greater than 0.7V, the transistor V1 is turned on, and the current flows through the indicator LED1 (always on) and the resistor R2. At this time, the V(GS) requirement cannot be met in the switch tube Q1 circuit, and the switch tube Q1 is cut off. The capacitor C1 can ensure that the switch tube Q1 is cut off for a long time. This circuit is simple and low-cost. It can not only protect the load board, but also give the user an alarm prompt.

[0037] Similarly, if it is a tooling test (passive and does not require power supply), if the device under test has abnormal power consumption, the device will be actively disconnected, which not only protects the device under test, but also gives an alarm to the tester.

[0038] Compared with the prior art, the active circuit with alarm protection described in the above embodiment has an existing application scheme on the market that controls the relay state through an active control circuit. In the abnormal case of high power consumption, the active control circuit controls the relay to disconnect the protection. However, the active control circuit has an independent power supply, which is relatively expensive and not suitable for the cost requirements of water meters and micro-power electronic products. The relay and the active part of the circuit are designed to be large in size, which is not suitable for the space requirements of water meters and micro-power electronic products. In addition, there is no alarm prompt function, and it is difficult for users to detect abnormal situations of the product. The utility model has a simple structure, low cost and small size. Through the designed passive control circuit, it can actively perform passive disconnection protection before the power supply battery and equipment are damaged when the power consumption is too large, which can protect the load board and give the user an alarm prompt, with high work efficiency and safety performance.

[0039] Obviously, the embodiments described above are only preferred embodiments of the utility model, rather than all embodiments. The preferred embodiments of the utility model are given in the accompanying drawings, but they do not limit the patent scope of the utility model. The utility model can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the utility model more thorough and comprehensive. Although the utility model is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to replace some of the technical features therein with equivalents. Any equivalent structure made using the contents of the utility model specification and the accompanying drawings, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the utility model.

Claims

1. A circuit with active alarm protection, characterized in that: include: Power supply XS1, resistor R1, passive control circuit, indicator LED1 and switch tube Q1; The passive control circuit includes a resistor R2, a capacitor C1 and a transistor V1, the positive electrode of the power supply XS1 is connected to one end of the resistor R1 and the emitter of the transistor V1 respectively, the other end of the resistor R1 is connected to the source of the switch tube Q1 and the base of the transistor V1 respectively, the collector of the transistor V1 is connected to one end of the indicator light LED1, the other end of the indicator light LED1 is connected to the capacitor C1, the gate of the switch tube Q1 and one end of the resistor R2 respectively, and the negative electrode of the power supply XS1 is connected to the other end of the capacitor C1 and the other end of the resistor R2 respectively.

2. The active circuit with alarm protection according to claim 1 is characterized in that: It also includes a super capacitor C2, one end of the super capacitor C2 is connected to the drain of the switch tube Q1, and the other end of the super capacitor C2 is connected to the negative electrode of the power supply XS1 and grounded.

3. The active circuit with alarm protection according to claim 1, characterized in that: The power source XS1 is a 3.6V lithium-ion battery.

4. The active circuit with alarm protection according to claim 1, characterized in that: The resistance value of the resistor R1 is 51Ω, and the resistance value of the resistor R2 is 1KΩ.

5. The active circuit with alarm protection according to claim 1 is characterized in that: The capacitance of the capacitor C1 is 1uF.

6. The active circuit with alarm protection according to claim 2, characterized in that: The capacity of the super capacitor C2 is 50F and the voltage is 3.8V.

7. The active circuit with alarm protection according to claim 1, characterized in that: The model of the switch tube Q1 is IRLML5203 / SOT23.

8. The active circuit with alarm protection according to claim 1, characterized in that: The model of the transistor V1 is LMBT4403LT1G / SOT23.

9. The active circuit with alarm protection according to claim 1, characterized in that: The model of the indicator light LED1 is KNR0805B0.8W-C.

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