Ground wire detection circuit and electric combustion stove

Abstract

The utility model belongs to the field of circuits, and discloses a ground wire detection circuit and an electric gas stove, the ground wire detection circuit comprises an AC commercial power input module, a resistor R1, a voltage-regulator tube ZD1, a diode D1, a detection chip U2 and an identification module; the positive electrode of the diode D1 is connected with the AC commercial power input module and a second pin of the detection chip U2, the negative electrode of the diode D1 is connected with the negative electrode of the voltage-regulator tube ZD1 and a first pin of the detection chip U2, the positive electrode of the voltage-regulator tube ZD1 is connected with one end of the resistor R1, the other end of the resistor R1 is used for being connected with a ground wire, and the other end of the resistor R1 is connected with a second pin of the detection chip U2. A third pin and a fourth pin of the detection chip U2 are connected with the identification module; the detection chip U2 is used for detecting whether a voltage drop exists between a first pin and a second pin of the detection chip U2 and sending a feedback signal to the identification module when the voltage drop exists between the first pin and the second pin, and the identification module feeds back in a preset form when receiving the feedback signal.

Description

Technical Field

[0001] The utility model relates to the technical field of circuits, in particular to a ground wire detection circuit and an electric stove. Background Art

[0002] Electrical equipment such as electric stoves are generally installed with ground wires for safety. However, problems such as line faults or poor contact may occur without the user's knowledge, which may lead to the risk of electric shock. In particular, the electric stove itself is a high-voltage electrical appliance, and the lack of a ground wire has an even greater impact on safety. Utility Model Content

[0003] In view of this, the utility model provides a ground wire detection circuit and an electric stove, which are used to solve the problem in the prior art that the ground wire is not connected due to line failure or poor contact, and the user cannot be informed.

[0004] In order to achieve one or part or all of the above purposes or other purposes, the utility model proposes a ground detection circuit, including: an AC mains input module, a resistor R1, a voltage regulator ZD1, a diode D1, a detection chip U2, and an identification module;

[0005] The positive electrode of the diode D1 is connected to the AC mains input module and the second pin of the detection chip U2, the negative electrode of the diode D1 is connected to the negative electrode of the voltage regulator tube ZD1 and the first pin of the detection chip U2, the positive electrode of the voltage regulator tube ZD1 is connected to one end of the resistor R1, and the other end of the resistor R1 is used to connect to the ground wire, and the third and fourth pins of the detection chip U2 are connected to the identification module;

[0006] The detection chip U2 is used to detect whether there is a voltage drop between its first pin and second pin, and sends a feedback signal to the identification module when there is a voltage drop between the first pin and the second pin. The identification module feeds back in a preset form when receiving the feedback signal.

[0007] Furthermore, the identification module includes: a resistor R2, a resistor R3, a resistor R4, a resistor R5, a transistor Q1, a main control MCU and a smart display screen;

[0008] One end of the resistor R2 is connected to the 4th pin of the detection chip U2, the other end of the resistor R2 is connected to the VCC2 pin and one end of the resistor R5, the other end of the resistor R5 is connected to the input end of the main control MCU and the collector of the transistor Q1, the emitter of the transistor Q1 is connected to the GND pin, the base of the transistor Q1 is connected to one end of the resistor R3 and one end of the resistor R4, the other end of the resistor R4 is connected to the GND pin, and the other end of the resistor R3 is connected to the 3rd pin of the detection chip U2;

[0009] The main control MCU is communicatively connected with the smart display screen.

[0010] Furthermore, the communication connection modes between the main control MCU and the smart display screen include but are not limited to Bluetooth connection, WIFI connection and wired connection.

[0011] In order to achieve one, part or all of the above purposes or other purposes, the utility model further provides an electric stove, which includes any of the above-mentioned ground detection circuits.

[0012] Implementing the embodiments of the present utility model will have the following beneficial effects:

[0013] After adopting the above ground wire detection circuit, the AC mains input module can be connected to the AC mains socket through the device power plug (3 holes for live wire, neutral wire and ground wire). When the ground wire is connected, the sine wave voltage of the live wire and neutral wire is rectified by diode D1 to form a pulsating DC voltage, and then connected to the ground through the voltage regulator ZD1 to form a loop. At this time, the 1st and 2nd pins of the detection chip U2 produce a voltage drop, which makes the 4th and 3rd pins of the detection chip U2 conductive. The detection chip U2 sends a feedback signal to the identification module through the 4th and 3rd pins. The identification module feeds back in a preset form when receiving the feedback signal. The above feedback method can be a speaker sounding an alarm, a warning light, a screen displaying a preset text symbol, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only 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.

[0015] in:

[0016] Figure 1 FIG. 4 is a schematic diagram of a circuit structure of a ground line detection circuit in an embodiment. DETAILED DESCRIPTION

[0017] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present invention; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present invention or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0018] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments 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.

[0019] 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.

[0020] Reference Figure 1 The utility model proposes a ground wire detection circuit, including: an AC mains input module, a resistor R1, a voltage regulator ZD1, a diode D1, a detection chip U2, and an identification module;

[0021] The positive electrode of the diode D1 is connected to the AC mains input module and the second pin of the detection chip U2, the negative electrode of the diode D1 is connected to the negative electrode of the voltage regulator tube ZD1 and the first pin of the detection chip U2, the positive electrode of the voltage regulator tube ZD1 is connected to one end of the resistor R1, and the other end of the resistor R1 is used to connect to the ground wire, and the third and fourth pins of the detection chip U2 are connected to the identification module;

[0022] The detection chip U2 is used to detect whether there is a voltage drop between its first pin and second pin, and sends a feedback signal to the identification module when there is a voltage drop between the first pin and the second pin. The identification module feeds back in a preset form when receiving the feedback signal.

[0023] The identification module includes: resistor R2, resistor R3, resistor R4, resistor R5, transistor Q1, main control MCU and smart display screen;

[0024] One end of the resistor R2 is connected to the 4th pin of the detection chip U2, the other end of the resistor R2 is connected to the VCC2 pin and one end of the resistor R5, the other end of the resistor R5 is connected to the input end of the main control MCU and the collector of the transistor Q1, the emitter of the transistor Q1 is connected to the GND pin, the base of the transistor Q1 is connected to one end of the resistor R3 and one end of the resistor R4, the other end of the resistor R4 is connected to the GND pin, and the other end of the resistor R3 is connected to the 3rd pin of the detection chip U2;

[0025] The main control MCU and the smart display screen are connected in communication. For example, the main control MCU and the smart display screen are connected in communication in a manner including but not limited to Bluetooth connection, WIFI connection and wired connection.

[0026] The power plug of the device (3 holes for live, neutral and ground) is connected to the AC mains socket. When the ground wire is connected, the sinusoidal voltage of the live and neutral wires is rectified by diode D1 to form a pulsating DC voltage, and then connected to the ground through voltage regulator ZD1 to form a loop. At this time, a voltage drop occurs between the 1st and 2nd pins of the detection chip U2. This voltage drop causes the 4th and 3rd pins of the detection chip U2 to be turned on. VCC2 is turned on through the 4th and 3rd pins of the detection chip U2 to reach the base of the transistor Q1. The transistor Q1 is turned on, and the ground wire detection is connected to the IO port of the MCU and is pulled to a low level. When the MCU detects that the IO port is at a low level, it is considered that a ground wire is connected to the power plug of the current device and connected to the ground. When the ground wire hole is not connected to the power plug of the current device, the voltage regulator ZD1 end cannot form a loop, and the 1st and 2nd pins of the detection chip U2 cannot produce a voltage drop, that is, the 4th and 3rd pins of the detection chip U2 are not conducting, and the base of the transistor Q1 is at a low level and cannot be conducted. The ground wire detection is connected to the IO port of the MCU at a high level. When the MCU detects that the IO port is at a high level, it is considered that the ground wire is not detected. At the same time, the MCU transmits the current status to the smart display screen through communication. The user can know that there is a problem with the ground wire by observing the smart display screen and repair it in time.

[0027] In order to achieve one, part or all of the above purposes or other purposes, the utility model further provides an electric stove, which includes any of the above-mentioned ground detection circuits.

[0028] Obviously, the embodiments described above are only some 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 ground line detection circuit, characterized in that: include: AC mains input module, resistor R1, voltage regulator ZD1, diode D1, detection chip U2, identification module; The positive electrode of the diode D1 is connected to the AC mains input module and the second pin of the detection chip U2, the negative electrode of the diode D1 is connected to the negative electrode of the voltage regulator tube ZD1 and the first pin of the detection chip U2, the positive electrode of the voltage regulator tube ZD1 is connected to one end of the resistor R1, and the other end of the resistor R1 is used to connect to the ground wire, and the third and fourth pins of the detection chip U2 are connected to the identification module; The detection chip U2 is used to detect whether there is a voltage drop between its first pin and second pin, and sends a feedback signal to the identification module when there is a voltage drop between the first pin and the second pin. The identification module feeds back in a preset form when receiving the feedback signal.

2. The ground detection circuit according to claim 1, characterized in that: The identification module includes: resistor R2, resistor R3, resistor R4, resistor R5, transistor Q1, main control MCU and intelligent display screen; One end of the resistor R2 is connected to the 4th pin of the detection chip U2, the other end of the resistor R2 is connected to the VCC2 pin and one end of the resistor R5, the other end of the resistor R5 is connected to the input end of the main control MCU and the collector of the transistor Q1, the emitter of the transistor Q1 is connected to the GND pin, the base of the transistor Q1 is connected to one end of the resistor R3 and one end of the resistor R4, the other end of the resistor R4 is connected to the GND pin, and the other end of the resistor R3 is connected to the 3rd pin of the detection chip U2; The main control MCU is communicatively connected with the smart display screen.

3. The ground line detection circuit according to claim 2, characterized in that: The communication connection modes between the main control MCU and the smart display screen include but are not limited to Bluetooth connection, WIFI connection and wired connection.

4. An electric stove, characterized in that: The electric stove comprises the ground detection circuit according to any one of claims 1 to 3.

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