CN218633308U - Ground connection detection control circuit and household appliance - Google Patents
Ground connection detection control circuit and household appliance Download PDFInfo
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- CN218633308U CN218633308U CN202222295610.1U CN202222295610U CN218633308U CN 218633308 U CN218633308 U CN 218633308U CN 202222295610 U CN202222295610 U CN 202222295610U CN 218633308 U CN218633308 U CN 218633308U
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Abstract
The utility model discloses a ground connection detects control circuit and domestic appliance, ground connection detects control circuit and is applied to domestic appliance, and domestic appliance has power supply, power end and earthing terminal, and ground connection detects control circuit and includes: the power switch is arranged between a power end of the household appliance and a power supply in series; the detection end of the grounding detection circuit is connected with the grounding end of the household appliance, and the grounding detection circuit is used for detecting the voltage of the grounding end and outputting a corresponding grounding detection signal; the input end of the controller is connected with the output end of the detection circuit, the output end of the controller is connected with the controlled end of the power switch, and the controller is used for receiving the grounding detection signal and controlling the power switch to disconnect the electric connection between the power end and the power supply when detecting that the household appliance is not grounded. The grounding condition of the household appliance needing grounding can be detected at any time.
Description
Technical Field
The utility model relates to a ground connection detection area, in particular to ground connection detection control circuit and domestic appliance.
Background
At present, more and more electrical appliances are used in the houses of people, the household electrical appliances are connected with the ground wire in the mains supply, and the household electrical appliances are grounded, so that the effects of preventing the human body from being subjected to electric shock, ensuring the normal operation of an electrical system, preventing lightning stroke and static electricity and the like can be achieved. In actual work, grounding work is easily ignored because grounding is a safety measure, and a grounding circuit does not work when special conditions do not occur, so that many manufacturers are reluctant to detect the grounding condition. In addition, in daily work, the grounding circuit is likely to be damaged due to various reasons, so that poor grounding is caused, but the equipment can normally work, so that the problem of the grounding circuit is not easy to find, and some household appliances do not have the function of grounding detection.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a ground connection detection control circuit and domestic appliance, aim at making the domestic appliance that needs the ground connection can detect the ground connection condition at any time.
In order to achieve the above object, the utility model provides a ground connection detection control circuit is applied to domestic appliance, domestic appliance has power supply, power end and earthing terminal, ground connection detection control circuit includes:
the power switch is arranged between a power end of the household appliance and a power supply in series;
the detection end of the grounding detection circuit is connected with the grounding end of the household appliance, and the grounding detection circuit is used for detecting the voltage of the grounding end and outputting a corresponding grounding detection signal;
the input end of the controller is connected with the output end of the detection circuit, the output end of the controller is connected with the controlled end of the power switch, and the controller is used for receiving the grounding detection signal and controlling the power switch to disconnect the electric connection between the power end and the power supply when detecting that the household appliance is not grounded.
Optionally, the ground fault detection circuit includes a first diode, a first resistor, a second resistor and a first MOS transistor, the anode of the first diode, the second end of the second resistor and the source of the first MOS transistor are connected to an external power supply, the cathode of the first diode is connected to the gate of the first MOS transistor, the first end of the first resistor is the detection end of the ground fault detection circuit, the second end of the first resistor and the first end of the second resistor are connected to the gate of the first MOS transistor, and the drain of the first MOS transistor is the output end of the ground fault detection circuit.
Optionally, the ground fault detection circuit further includes a rectifier circuit, an input end of the rectifier circuit is a detection end of the ground fault detection circuit, an output end of the rectifier circuit is connected to the first end of the first resistor, and the rectifier circuit is configured to rectify the voltage detected by the ground fault detection circuit and output the rectified voltage to the controller.
Optionally, the ground fault detection circuit further includes a filter circuit, an input end of the filter circuit is connected to the external power supply, an output end of the filter circuit is connected to a gate of the first MOS transistor, and the filter circuit is configured to filter the voltage detected by the ground fault detection circuit and output the filtered voltage to the controller.
Optionally, the ground detection control circuit further comprises:
and the input end of the alarm circuit is connected with the output end of the controller, and the controller is also used for controlling the alarm circuit to work when the household appliance is not grounded according to the voltage detection signal.
Optionally, the alarm circuit includes a third resistor and an LED lamp, a first end of the third resistor is an input end of the alarm circuit, a second end of the third resistor is connected to an anode of the LED lamp, and a cathode of the LED lamp is grounded.
Optionally, the ground fault detection control circuit further comprises:
the start-stop trigger key is electrically connected with the controller and is used for outputting a corresponding start-stop trigger signal when triggered by a user;
and the controller is also used for controlling the grounding detection control circuit to start/stop working when the start-stop trigger signal is received.
Optionally, the ground fault detection control circuit further comprises:
the wireless communication circuit is arranged on the circuit board, the output end of the wireless communication circuit is connected with the input end of the controller, the wireless communication circuit is also in communication connection with a user terminal, and the wireless communication circuit is used for outputting a wireless control signal output by the user terminal to the controller;
the controller is further configured to control the ground detection control circuit to start/stop operating when receiving the wireless control signal.
The utility model also provides a domestic appliance, domestic appliance includes as above ground connection detection control circuit.
The utility model discloses technical scheme detects the voltage of domestic appliance earthing terminal through the ground connection detection circuitry to output corresponding ground connection detected signal to the controller, and the controller is according to the ground connection detected signal that receives, when detecting domestic appliance does not have ground connection, control switch cuts off the electricity between power end and the power supply and is connected, so that domestic appliance stop work; the condition that safety accidents occur due to the fact that the household appliances are not grounded when special conditions occur can be avoided, and personal safety of users can be guaranteed. The utility model discloses aim at making the domestic appliance that needs the ground connection can detect the ground connection condition at any time.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic diagram of functional modules of an embodiment of the ground fault detection control circuit of the present invention;
fig. 2 is a schematic circuit diagram of an embodiment of a ground detection circuit in the ground detection control circuit of the present invention;
fig. 3 is a schematic circuit diagram of an embodiment of an alarm circuit in the ground detection control circuit of the present invention;
fig. 4 is a schematic diagram of a functional module of another embodiment of the ground detection control circuit of the present invention.
The reference numbers illustrate:
the objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, back, 8230; \8230;) are provided in the embodiments of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The utility model provides a ground connection detection control circuit 100 is applied to domestic appliance, domestic appliance has power supply, power end and earthing terminal.
Referring to fig. 1, in an embodiment of the present invention, the ground fault detection control circuit 100 includes:
the power switch 30 is arranged between a power end of the household appliance and a power supply in series, and the power switch 30 is connected with the power end of the household appliance in series;
the detection end of the grounding detection circuit 10 is connected with the grounding end of the household appliance, and the grounding detection circuit 10 is used for detecting the voltage of the grounding end and outputting a corresponding grounding detection signal;
and the input end of the controller 20 is connected with the output end of the detection circuit, the output end of the controller 20 is connected with the controlled end of the power switch 30, and the controller 20 is configured to receive the grounding detection signal and control the power switch 30 to disconnect the electrical connection between the power end and the power supply when detecting that the household appliance is not grounded.
In this embodiment, the power switch 30 may be a relay, a breaker, a contactor, or other devices; the power switch 30 is arranged between the power end of the household appliance and the power supply in series, when the power switch 30 is closed, the power end of the household appliance is connected with the power supply, and the household appliance can normally work; when the power switch 30 is turned off, the connection between the power source terminal of the household appliance and the power supply source is disconnected, and the household appliance stops working. The ground detection circuit 10 may be composed of one or more resistors, one or more diodes, and other electronic components through different connection relationships, the ground detection circuit 10 may detect a voltage of a ground terminal of the household appliance, and output a corresponding ground detection Signal to the controller 20, and the controller 20 may be a Digital Signal Processor (DSP), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), a microprocessor, an MCU single chip or other electronic components; when the controller 20 detects that the household appliance is not grounded according to the received grounding detection signal, the power switch 30 is controlled to disconnect the electrical connection between the power supply end and the power supply, so that the household appliance stops working, and safety accidents are avoided; for example, when the household electrical appliance is not grounded, the ground detection circuit 10 detects that the voltage of the ground terminal is low, and outputs a low-level electrical signal, i.e., a ground detection signal to the controller 20, and the controller 20 controls the power switch 30 to be turned off, so that the household electrical appliance stops working; when the household appliance is normally grounded, the ground detection circuit 10 detects that the voltage of the ground terminal is high, and outputs a high-level electric signal, namely, a ground detection signal to the controller 20, and the controller 20 controls the power switch 30 to be closed, so that the household appliance normally works; the grounding detection control circuit 100 can be applied to household appliances needing grounding, such as refrigerators, air conditioners, electric steamers and the like, and can stop the household appliances when the household appliances are not grounded, so that safety accidents caused by the fact that the household appliances are not grounded under special conditions are avoided; for example, when the line is damaged to cause the electric leakage of the household appliance, or the lightning stroke is suffered.
The utility model discloses technical scheme detects the voltage of domestic appliance earthing terminal through ground connection detection circuitry 10 to output corresponding ground connection detected signal to controller 20, and controller 20 is according to the ground connection detected signal that receives, when detecting domestic appliance does not have ground connection, control switch 30 breaks off the electricity between power end and the power supply and is connected, so that domestic appliance stops working; the condition that no grounding occurs when the household appliance has special conditions to cause safety accidents can be avoided, and the personal safety of a user can be guaranteed. The utility model discloses aim at making the domestic appliance that needs the ground connection can detect the ground connection condition at any time.
Referring to fig. 2, in an embodiment, the ground fault detecting circuit 10 includes a first diode D1, a first resistor R1, a second resistor R2, and a first MOS transistor Q1, an anode of the first diode D1, a second terminal of the second resistor R2, and a source of the first MOS transistor Q1 are connected to an external power source, a cathode of the first diode D1 is connected to a gate of the first MOS transistor Q1, a first terminal of the first resistor R1 is a detecting terminal of the ground fault detecting circuit 10, a second terminal of the first resistor R1 and a first terminal of the second resistor R2 are connected to the gate of the first MOS transistor Q1, and a drain of the first MOS transistor Q1 is an output terminal of the ground fault detecting circuit 10.
In this embodiment, the first diode D1 plays a role of stabilizing voltage, can stabilize voltage in a circuit, protect electronic components in the circuit, and prevent the electronic components from being broken down by high current, the first resistor R1 plays a role of limiting current resistance, and can limit current in the circuit, and prevent the current from being too large and damaging the components in the circuit, the second resistor R2 can be connected in parallel with a capacitor to form a filter circuit to filter an electrical signal in the circuit, the first MOS transistor Q1 can adopt an NMOS transistor, when a ground terminal of the household appliance is grounded, a gate of the first MOS transistor Q1 receives a high level, the first MOS transistor Q1 is turned on, an electrical signal output to the controller 20, that is, a ground detection signal is a high level, the controller 20 does not control the power switch 30 to disconnect electrical connection between a power supply terminal and a power supply when receiving the electrical signal of the high level, and the household appliance continues to work; when the grounding end of the household appliance is not grounded, the grid of the first MOS transistor Q1 receives a low level, the first MOS transistor Q1 is cut off, and an electric signal output to the controller 20, that is, the grounding detection signal is a low level, and when the controller 20 receives the low-level electric signal, it is proved that the household appliance is not grounded, the power switch 30 is controlled to disconnect the electric connection between the power supply end and the power supply, so that the household appliance stops working, and the safety of a user is guaranteed. In this embodiment, the ground detection circuit 10, which is composed of the first diode D1, the first resistor R1, the second resistor R2 and the first MOS transistor Q1, can output a corresponding electrical signal, i.e., a ground detection signal, to the controller 20 when the household appliance is grounded or not grounded.
Referring to fig. 2, in an embodiment, the ground fault detection circuit 10 further includes a rectifier circuit, an input end of the rectifier circuit is a detection end of the ground fault detection circuit 10, an output end of the rectifier circuit is connected to the first end of the first resistor R1, and the rectifier circuit is configured to rectify the voltage detected by the ground fault detection circuit 10 and output the rectified voltage to the controller 20.
In this embodiment, the rectifying circuit may be composed of the second diode D2, but is not limited to one diode, and may also be composed of a plurality of diodes through different connection manners; the rectifying circuit can rectify the alternating current of the mains supply into direct current and then output the direct current to the controller 20, so that the controller 20 can identify the direct current more easily. In the embodiment, the rectifier circuit composed of the second diode D2 can rectify the external alternating current into direct current and output the direct current to the controller 20.
Referring to fig. 2, in an embodiment, the ground fault detection circuit 10 further includes a filter circuit, an input end of the filter circuit is connected to the external power supply, an output end of the filter circuit is connected to a gate of the first MOS transistor Q1, and the filter circuit is configured to filter the voltage detected by the ground fault detection circuit 10 and output the filtered voltage to the controller 20.
In this embodiment, the filter circuit may be composed of the first capacitor C1, but is not limited to one capacitor, and may also be composed of a plurality of capacitors through different connection manners, or may also be formed by connecting a capacitor in parallel with a resistor to form a filter circuit; the filter circuit can filter the rectified direct current, so that other impurities cannot exist in the electric signal sent to the controller 20, the electric signal can be clearly identified by the controller 20, and the detection accuracy is improved. In this embodiment, the filter circuit formed by the first capacitor C1 can filter out impurities in the electrical signal and output the filtered electrical signal to the controller 20.
Referring to fig. 3 to 4, in an embodiment, the ground detection control circuit 100 further includes:
and the input end of the alarm circuit is connected with the output end of the controller 20, and the controller 20 is further used for controlling the alarm circuit to work when the household appliance is not grounded according to the voltage detection signal.
In this embodiment, alarm circuit can be through the disconnection of modes such as bright lamp, scintillation or buzzing suggestion user domestic appliance and ground, and specific suggestion mode can set up to different users, for example can adopt buzzing mode suggestion to the not good user of vision, can adopt bright lamp or the mode suggestion of scintillation to the not good user of hearing, makes the user can in time inform maintenance personal to maintain domestic appliance, avoids taking place the accident. The embodiment can prompt a user through the alarm circuit when the household appliance is not grounded.
Referring to fig. 3 to 4, in an embodiment, the alarm circuit includes a third resistor R3 and an LED lamp D3, a first end of the third resistor R3 is an input end of the alarm circuit, a second end of the third resistor R3 is connected to an anode of the LED lamp D3, and a cathode of the LED lamp D3 is grounded.
In this embodiment, the third resistor R3 functions as a current-limiting resistor, and is used to prevent the LED lamp D3 from being burned out due to excessive current; when the controller 20 detects that the household appliance is not grounded according to the voltage detection signal, it may also control the alarm circuit to operate, for example, output a high-level electrical signal, so that the LED lamp D3 in the alarm circuit emits light for a period of time to prompt the user that the household appliance is not grounded, the time for which the LED lamp D3 emits light may be set to one second, two seconds or three seconds, and the specific time may be set according to actual conditions. The alarm circuit formed by the third resistor R3 and the LED lamp D3 can prompt a user that the household appliance is not grounded in a light-emitting mode.
Referring to fig. 3 to 4, in an embodiment, the ground detection control circuit 100 further includes:
the start-stop trigger button 40 is electrically connected with the controller 20, and the start-stop trigger button 40 is used for outputting a corresponding start-stop trigger signal when triggered by a user;
the controller 20 is further configured to control the ground detection control circuit 100 to start/stop operation when receiving the start/stop trigger signal.
In this embodiment, a user may press the start-stop trigger button 40 once to output a start-stop trigger signal to the controller 20, and if the ground detection control circuit 100 is in a working state at this time, the controller 20 controls the ground detection control circuit 100 to stop working, and if the ground detection control circuit 100 is in a state of stopping working at this time, the controller 20 controls the ground detection control circuit 100 to start working; a user can press the start-stop trigger button 40 when starting the household appliance, so that the grounding detection control circuit 100 starts to work to detect whether the household appliance is grounded; when the household appliance is turned off, the start-stop trigger button 40 is pressed by the way to stop the grounding detection control circuit 100, and because the household appliance does not need to detect whether the grounding is generated when the household appliance is not operated, the grounding detection control circuit 100 can stop working, so that resources can be saved. The ground fault detection control circuit 100 can be controlled to start or stop working by pressing the start/stop trigger button 40 in the present embodiment.
Referring to fig. 3 to 4, in an embodiment, the ground detection control circuit 100 further includes:
a wireless communication circuit 50, an output terminal of the wireless communication circuit 50 is connected to an input terminal of the controller 20, the wireless communication circuit 50 is further connected to a user terminal in a communication manner, and the wireless communication circuit 50 is configured to output a wireless control signal output by the user terminal to the controller 20;
the controller 20 is further configured to control the ground detection control circuit 100 to start/stop operation when receiving the wireless control signal.
In this embodiment, the wireless communication circuit 50 may be composed of a wireless communication chip that uses a wireless communication technology, and the wireless communication is a communication method that exchanges information by using a characteristic that an electromagnetic wave signal can propagate in a free space. The wireless communication chip can communicate with the user terminal in a 4G/5G mode and the like; the wireless communication chip has the following functions: the radio frequency chip is a wireless transmitting chip, when discrete components are adopted, the discrete components are simply modulated and transmitted, and serve as a complete chip to play complex functions of data input, data receiving, data temporary storage, data packaging, power regulation speed regulation and the like. Therefore, the wireless communication circuit 50 can receive the wireless control signal output by the user through the user terminal, and output the wireless control signal to the controller 20, where the user terminal can be a mobile phone or a bluetooth headset; the controller 20 may control the ground detection control circuit 100 to start or stop operating according to the wireless control signal; for example, if a user wants to detect whether a household appliance is grounded, a wireless control signal may be sent to the ground detection control circuit 100 fixed to the household appliance through a mobile phone or bluetooth, the wireless communication circuit 50 in the ground detection control circuit 100 may receive the wireless control signal and output the wireless control signal to the controller 20, so that the controller 20 controls the ground detection control circuit 100 to start operating, that is, the ground detection circuit 10 to start detecting whether the household appliance is grounded, and the user may also send the wireless control signal through the mobile phone or bluetooth, so that the controller 20 controls the ground detection control circuit 100 to stop operating. In this embodiment, the wireless communication circuit 50 is provided, so that the user can control the ground fault detection control circuit 100 to start or stop operating through a device such as a mobile phone or a bluetooth headset.
The utility model discloses still provide a domestic appliance.
In an embodiment, the household appliance comprises the ground detection control circuit 100 as described above. The specific structure of the ground fault detection control circuit 100 refers to the above embodiments, and since the home appliance adopts all the technical solutions of all the above embodiments, at least all the beneficial effects brought by the technical solutions of the above embodiments are achieved, and no further description is given here.
The above is only the optional embodiment of the present invention, and not therefore the patent scope of the present invention is limited, all under the technical idea of the present invention, the equivalent structure transformation made by the contents of the specification and the attached drawings is utilized, or the direct/indirect application is included in other related technical fields in the patent protection scope of the present invention.
Claims (9)
1. A ground detection control circuit is applied to household appliances, the household appliances have power supply, power end and earthing terminal, its characterized in that, ground detection control circuit includes:
the power switch is arranged between a power end of the household appliance and a power supply in series;
the detection end of the grounding detection circuit is connected with the grounding end of the household appliance, and the grounding detection circuit is used for detecting the voltage of the grounding end and outputting a corresponding grounding detection signal;
the input end of the controller is connected with the output end of the detection circuit, the output end of the controller is connected with the controlled end of the power switch, and the controller is used for receiving the grounding detection signal and controlling the power switch to disconnect the electric connection between the power end and the power supply when detecting that the household appliance is not grounded.
2. The ground detection control circuit of claim 1, wherein the ground detection circuit comprises a first diode, a first resistor, a second resistor, and a first MOS transistor, an anode of the first diode, a second terminal of the second resistor, and a source of the first MOS transistor are connected to an external power source, a cathode of the first diode is connected to a gate of the first MOS transistor, a first terminal of the first resistor is a detection terminal of the ground detection circuit, a second terminal of the first resistor and a first terminal of the second resistor are connected to the gate of the first MOS transistor, and a drain of the first MOS transistor is an output terminal of the ground detection circuit.
3. The ground fault detection control circuit according to claim 2, wherein the ground fault detection circuit further comprises a rectifier circuit, an input terminal of the rectifier circuit is a detection terminal of the ground fault detection circuit, an output terminal of the rectifier circuit is connected to the first terminal of the first resistor, and the rectifier circuit is configured to rectify a voltage detected by the ground fault detection circuit and output the rectified voltage to the controller.
4. The ground detection control circuit according to claim 2, wherein the ground detection circuit further includes a filter circuit, an input terminal of the filter circuit is connected to the external power supply, an output terminal of the filter circuit is connected to the gate of the first MOS transistor, and the filter circuit is configured to filter the voltage detected by the ground detection circuit and output the filtered voltage to the controller.
5. The ground detection control circuit of claim 1, further comprising:
and the input end of the alarm circuit is connected with the output end of the controller, and the controller is also used for controlling the alarm circuit to work when the household appliance is not grounded according to the voltage detection signal.
6. The ground detection control circuit of claim 5, wherein the alarm circuit comprises a third resistor and an LED lamp, a first end of the third resistor is an input end of the alarm circuit, a second end of the third resistor is connected with an anode of the LED lamp, and a cathode of the LED lamp is grounded.
7. The ground detection control circuit of claim 1, further comprising:
the start-stop trigger key is electrically connected with the controller and is used for outputting a corresponding start-stop trigger signal when triggered by a user;
and the controller is also used for controlling the grounding detection control circuit to start/stop working when the start-stop trigger signal is received.
8. The ground detection control circuit of claim 1, further comprising:
the output end of the wireless communication circuit is connected with the input end of the controller, the wireless communication circuit is also in communication connection with a user terminal, and the wireless communication circuit is used for outputting a wireless control signal output by the user terminal to the controller;
the controller is further configured to control the ground detection control circuit to start/stop operating when receiving the wireless control signal.
9. A household appliance characterized in that it comprises a ground detection control circuit according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222295610.1U CN218633308U (en) | 2022-08-30 | 2022-08-30 | Ground connection detection control circuit and household appliance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222295610.1U CN218633308U (en) | 2022-08-30 | 2022-08-30 | Ground connection detection control circuit and household appliance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218633308U true CN218633308U (en) | 2023-03-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222295610.1U Active CN218633308U (en) | 2022-08-30 | 2022-08-30 | Ground connection detection control circuit and household appliance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218633308U (en) |
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2022
- 2022-08-30 CN CN202222295610.1U patent/CN218633308U/en active Active
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