CN208859899U - Earth leakage protective device and electric heater - Google Patents
Earth leakage protective device and electric heater Download PDFInfo
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Abstract
The utility model discloses a kind of earth leakage protective device and electric heater, the device include: three-pole gang operated switch be set to zero, fire, on three-line, and control zero, fire, three-line and three pole pins on/off；Ground wire leakage protection module, when ground line current signal reaches predetermined current threshold, control three-pole gang operated switch disconnect zero, fire, three-line and three pole pins electrical connection, and export count signal；Main control module, starts timing when receiving count signal, and the first timing time then, control three-pole gang operated switch restore zero, fire, three-line and three pole pins electrical connection；And the number of the count signal received is counted, in the second timing time, according to the number counted, control three-pole gang operated switch disconnect zero, fire, three-line and three pole pins electrical connection.The problem of the utility model, which solves the interference signal in ground wire, causes water heater to malfunction, and influences the normal use of user.
Description
Technical Field
The utility model relates to an electric water heater technical field, in particular to earth leakage protection device and electric water heater.
Background
In most electric water heaters, a three-pole linked switch is provided in an earth leakage protection plug, and when a current detection device detects that a ground wire is electrified, the three-pole linked switch is turned off, so that an external power supply is interrupted to supply power to the electric water heater. However, a transient ground current signal may be generated in the ground wire due to a lightning strike or the electric water heater itself, and the transient ground current signal may interfere with the detection of the current detection device to cause a malfunction of the plug wire of the leakage protection power supply, thereby controlling the electric water heater to stop working when the power is cut off, and affecting the normal use of the user.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an earth leakage protection device and electric water heater, when aiming at solving the short-lived ground wire current signal that ground wire earth leakage protection module detected for interference signal, control electric water heater outage stop work, lead to earth leakage protection power plug line malfunction, influence user's normal use's problem.
In order to achieve the above object, the utility model provides an earth leakage protection device, earth leakage protection device includes:
the three-pole pin and the zero, fire and ground circuits connected with the three-pole pin;
the three-pole linked switch is arranged on the zero line, the fire line and the ground line and controls the on/off of the zero line, the fire line and the ground line and the three-pole pin;
the control end of the ground wire leakage protection module is connected with the controlled end of the three-pole linked switch, and the ground wire leakage protection module is used for detecting a ground wire current signal, controlling the three-pole linked switch to disconnect the electrical connection between the zero, fire and ground lines and the three-pole pins when the ground wire current signal reaches a preset current threshold value, and outputting a counting signal;
the main control module is used for starting timing when the counting signal is received and controlling the three-pole linked switch to recover the electrical connection between the three lines of zero, fire and ground and the three-pole pin when the first timing time is up; and the number of the first and second groups,
and counting the number of times of the received counting signal, and controlling the three-pole linked switch to disconnect the three lines of the zero line, the fire line and the ground line from the three-pole pin according to the counted number of times in a second timing time.
Preferably, the ground current detection module includes a first electromagnetic induction coil for inducing the ground current signal, a ground current detection circuit for amplifying the ground current signal, a first leakage detection chip for performing operation processing on the ground current signal, a trip circuit for outputting a trip signal according to a trip instruction output by the first leakage detection chip, and a trip mechanism for controlling the three-pole linked switch to be switched off according to the trip signal;
the first electromagnetic induction coil is annularly arranged on the periphery of a ground wire and is electrically connected with the input end of the ground wire current detection circuit; the output end of the ground wire current detection circuit is connected with the input end of the first electric leakage detection chip, and the output end of the first electric leakage detection chip is connected with the input end of the tripping circuit; the output end of the tripping circuit is connected with the controlled end of the tripping mechanism; and the driving end of the tripping mechanism is connected with the controlled end of the three-pole linked switch.
Preferably, the trip circuit comprises a trip coil, a first trip thyristor, a second trip thyristor, a rectifier diode and a charge-discharge capacitor, wherein the first end of the trip coil is interconnected with the cathode of the first trip thyristor, the anode of the rectifier diode and the positive terminal of the first direct-current power supply, and the second end of the trip coil is connected with the anode of the second trip thyristor; the anode of the first tripping controlled silicon is connected with the cathode of the rectifier diode and the first end of the charge-discharge capacitor; the grid electrodes of the first tripping controllable silicon and the second tripping controllable silicon are respectively connected with the main control module and the control end of the first leakage detection chip; and the cathode of the second tripping controllable silicon is interconnected with the second end of the charge-discharge capacitor and the negative end of the first direct-current power supply.
Preferably, the main control module includes a main control chip for receiving the counting signal, outputting a first control signal after receiving the counting signal for a first timing time, counting the number of times of the received counting signal, and outputting a second control signal when detecting that the counted number of times reaches a preset number of times within a second timing time, a power-on action circuit for controlling to output a power-on signal according to a recovery instruction output by the main control chip, and a power-on action mechanism for controlling to close the three-pole linkage switch according to the power-on signal; wherein,
the input end of the main control chip is connected with the output end of the ground wire leakage protection module, the first control end of the main control chip is connected with the controlled end of the power-on action circuit, and the second control end of the main control chip is connected with the input end of the tripping circuit; the output end of the power-on action circuit is connected with the input end of the power-on action mechanism; and the driving end of the power-on action mechanism is connected with the controlled end of the three-pole linked switch.
Preferably, the earth leakage protection device further comprises an alarm circuit, a controlled end of the alarm circuit is connected with a third control end of the main control chip, and the main control chip is further configured to control the alarm circuit to operate when the counted times reach the preset times within the second timing time.
Preferably, the earth leakage protection device further comprises a power supply for supplying power to the main control chip, a first input end and a second input end of the power supply are respectively connected with the live line and the zero line, and an output end of the power supply is connected with a power end of the main control chip.
Preferably, the leakage protection device further comprises a zero power failure detection circuit for detecting the voltages of the live line and the zero line, wherein a detection end of the zero power failure detection circuit is connected with the live line and the zero line, and an output end of the zero power failure detection circuit is connected with the main control chip;
the main control chip is also used for outputting the second control signal to the tripping circuit when receiving the zero-fire power-down signal output by the zero-fire power-down detection circuit.
Preferably, the leakage protection device further includes a zero-fire electromagnetic induction coil for inducing leakage signals of the live line and the zero line, a zero-fire leakage detection circuit for amplifying the leakage signals, and a second leakage detection chip for performing operation processing on the leakage signals;
the zero-fire electromagnetic induction coil is annularly arranged on the peripheries of a zero line and a live line of the leakage protection plug and is electrically connected with the input end of the zero-fire leakage detection circuit; the output end of the zero-fire electric leakage detection circuit is connected with the input end of the second electric leakage detection chip, and the output end of the second electric leakage detection chip is connected with the input end of the tripping circuit.
The utility model also discloses an electric water heater, which comprises the electric leakage protection device; the earth leakage protection device comprises: the three-pole pin and the zero, fire and ground circuits connected with the three-pole pin; the three-pole linked switch is arranged on the zero line, the fire line and the ground line and controls the on/off of the zero line, the fire line and the ground line and the three-pole pin; the control end of the ground wire leakage protection module is connected with the controlled end of the three-pole linked switch, and the ground wire leakage protection module is used for detecting a ground wire current signal, controlling the three-pole linked switch to disconnect the electrical connection between the zero, fire and ground lines and the three-pole pins when the ground wire current signal reaches a preset current threshold value, and outputting a counting signal; the main control module is used for starting timing when the counting signal is received and controlling the three-pole linked switch to recover the electrical connection between the three lines of zero, fire and ground and the three-pole pin when the first timing time is up; and counting the number of times of the received counting signal, and controlling the three-pole linked switch to disconnect the electrical connection between the three lines of zero, fire and ground and the three-pole pin according to the counted number of times in a second timing time.
The utility model discloses a set up ground wire earth leakage protection module, come the current signal in the detection ground wire, and when ground wire current signal reached the predetermined current threshold value, control three pole linked switch disconnection the three lines of zero, fire, ground with the electrical connection of three pole participate in, and output count signal, so that main control module, after receiving count signal lasts first timing time, control three pole linked switch resume the three lines of zero, fire, ground with the electrical connection of three pole participate in; and meanwhile, counting the number of times of the received counting signal through the main control module, and controlling the three-pole linkage switch to disconnect the three lines of zero, fire and ground and the electrical connection of the three-pole pins when the counted number of times reaches the preset number of times in the second timing time. The utility model discloses avoided the ground wire electrified and made electric water heater when the electric leakage phenomenon appears, made the user have the dangerous problem of electric shock, still solved when the short-lived ground wire current signal that ground wire earth leakage protection module detected is interference signal simultaneously, control electric water heater outage stop work, lead to earth leakage protection power plug line malfunction, influence user's normal use problem.
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 leakage protection device of the present invention applied to an electric water heater;
FIG. 2 is a schematic circuit diagram of an embodiment of the earth leakage protection device shown in FIG. 1;
fig. 3 is a schematic circuit diagram of another embodiment of the earth leakage protection device shown in fig. 1.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | Three-pole pin | 31 | First electricityMagnetic induction coil |
| 20 | Three-pole linked switch | 32 | Ground current detection circuit 32 |
| 30 | Earth wire leakage protection module | 34 | Trip circuit |
| 40 | Main control module | 35 | Tripping mechanism |
| 50 | Alarm circuit | 33 | First electric leakage detection chip |
| 60 | Power supply | 41 | Master control chip |
| 70 | Zero-fire power failure detection circuit | 61 | Rectifying unit |
| 81 | Zero-fire electromagnetic induction coil | 62 | Voltage reduction unit |
| 82 | Zero-fire leakage detection circuit | 63 | Voltage-stabilizing filter unit |
| 83 | Second electric leakage detection chip | 100 | Connector with a locking member |
| VCC1 | First direct current power supply | 200 | Power supply flexible wire |
| 341 | Trip coil | 91 | Overtemperature detection circuit |
| 342 | First tripping controlled silicon | 92 | Test switch |
| 343 | Second tripping controlled silicon | 93 | Reset switch |
| 344 | Rectifier diode | 94 | Function expansion interface |
| 345 | Charge-discharge capacitor |
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 upper, lower, left, right, front and rear … …) are involved in the embodiment 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 drawings), and if the specific posture is changed, the directional indications are changed accordingly.
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 an earth leakage protection device is applied to in the electric water heater.
In the electric water heater, a three-pole linked switch is mostly arranged in an electric leakage protection device, for example, an electric leakage protection power plug, when the electric water heater has an electric leakage phenomenon, a part of current does not flow back to a power supply from a live wire through a zero line but flows into the ground through a ground wire or a human body in an electric loop, so that a user has electric shock danger when using the electric water heater, therefore, a current detection device is mostly arranged in the electric water heater to detect whether the ground wire is electrified or not, and when the ground wire is detected to be electrified, the three-pole linked switch is disconnected, and then the external power supply is interrupted to supply power to the electric water heater. However, a transient ground current signal may be generated in the ground wire due to external interference such as lightning stroke or the power consumption environment of the electric water heater itself, and if the current detection device detects the transient ground current signal, the electric water heater is controlled to be powered off and stop working, so that the detection of the current detection device is interfered to cause malfunction of the leakage protection power plug wire, and normal use of a user is affected. In the subsequent maintenance process, the maintenance personnel are difficult to check the fault of the water heater power failure caused by the transient ground wire current signal, and the misoperation of the current detection device cannot be solved even if the power plug of the leakage protection plug is replaced. In order to solve the problem, the utility model discloses when detecting ground wire current signal, control tripolar gang switch disconnection to control water heater outage stop work, and carry out analysis processes to this ground wire current signal, if confirm when this ground wire current signal is transient interference signal, then control tripolar gang switch-on that resets, continue work with control electric water heater.
Referring to fig. 1 and 3, in an embodiment of the present invention, the leakage protection device includes:
a three-pole pin 10 and three lines of zero N, fire L and earth E connected with the three-pole pin 10;
the three-pole linked switch 20 is arranged on the zero N line, the fire L line and the ground E line and controls the on/off of the zero N line, the fire L line and the ground E line and the three-pole pin 10;
the ground wire leakage protection module 30 is used for detecting a ground wire current signal, controlling the three-pole linked switch 20 to disconnect the electrical connection between the three lines of zero N, fire L and ground E and the three-pole pin 10 when the ground wire current signal reaches a preset current threshold value, and outputting a counting signal;
the main control module 40 is used for starting timing when receiving the counting signal and controlling the three-pole linked switch 20 to recover the electrical connection between the three lines of zero N, fire L and earth E and the three-pole pin 10 when the first timing time is up; and the number of the first and second groups,
and counting the number of times of the received counting signal, and controlling the three-pole linked switch 20 to disconnect the electric connection between the zero-N, fire-L and ground-E lines and the three-pole pin 10 according to the counted number of times in a second timing time.
In this embodiment, the three-pole pin 10 is a single-phase two-pole three-pole pin 10 with a ground E three-pole insertion sheet structure, and is electrically connected to an external power socket in an insertion manner to access power voltage, a power cord is further disposed on a line connecting the three-pole pin 10 with the zero N, the fire L, and the ground E, and the three-pole pin 10 is electrically connected to a connector for connecting to a power input interface of the electric water heater through a three-pole linked switch 20 and the power cord. The three-pole linked switch 20 includes three moving/static contacts of zero N, fire L and earth E, the static contact of the three-pole linked switch 20 is electrically connected with the three-pole pin 10, and when the moving contact and the static contact of the three-pole linked switch 20 are closed, the power supply voltage is output. After the three-pole linked switch 20 controls the disconnection of the three lines of the zero-N line N, the fire line L and the ground line EE, the separation distance between each pole movable contact and each pole fixed contact of the three-pole linked switch 20 is larger than 2mm, so that each movable contact and each pole fixed contact are completely disconnected, the safe and reliable electrical connection between a disconnected external power supply and a power line of the electrical equipment is further realized, and the electrical equipment and the external power supply are ensured to be in a safe disconnected and isolated state.
The preset current threshold of the ground wire leakage protection module 30 is generally set to be within 50mA, and the preferred values are 5mA, 6mA, 10mA, 15mA and 30mA, when the current value of the current signal in the ground wire E is detected to be less than or equal to 50mA, it is determined that no leakage current exists in the ground wire E, the ground wire leakage protection module 30 does not operate, when the current value of the current signal summarized by the ground wire E is detected to be greater than 50mA, it is determined that leakage current exists in the ground wire E at the moment, the ground wire leakage protection module 30 outputs a corresponding control signal to control the three-pole linked switch 20 to disconnect the electrical connection between the three lines of zero N, fire L and ground E and the three-pole pin 10, so as to stop supplying power to the water heater. At this time, the earth leakage protection module 30 also outputs a counting signal to the main control module 40.
When the main control module 40 receives the counting signal and the first timing time TY △ is up, the first timing time TY △ may be set to a corresponding value according to the model of the water heater, for example, may be set within 30min, after the ground leakage protection module 30 controls the three-pole linked switch 20 to disconnect the electrical connection between the three lines of zero N, fire L, and ground E and the three-pole pin 10 for 30min, the main control module 40 outputs a first control signal to control the three-pole linked switch 20 to recover the electrical connection between the three lines of zero N, fire L, and ground E and the three-pole pin 10, so as to recover the power supply to the electric water heater, and further solve the problem that when the transient ground current signal detected by the ground leakage protection module 30 is an interference signal, the electric water heater is controlled to stop working due to power failure, which causes a malfunction of a leakage protection power supply plug wire, and affects the normal use of.
The main control module 40 also counts the counting signal, that is, records the power-off times of the earth leakage protection module 30 controlling the three-pole linked switch 20, if the power-off times counted by the main control module 40 is greater than the preset times within the second timing time, it can be determined that the current signal in the earth wire E is an electric leakage signal rather than an interference signal, and outputs a second control signal to control the three-pole linked switch 20 to disconnect the electrical connection between the three lines of zero N, fire L, and earth E and the three-pole pin 10, thereby solving the problem that the electric leakage phenomenon of the electric water heater causes electric shock to the user when the earth wire E is electrified, in this embodiment, the second timing time TC △ can be set according to the formula (1),
TC△＝(N△-1)*TY△(1)
where N △ is a predetermined number of times, N △ is generally set to within 10, and the second timing time TC △ can also be understood as the time interval between the first and nth turn-off of the three-pole linked switch 20, of course, if the power-off number counted by the main control module 40 is less than or equal to the predetermined number of times within the second timing time, it can be determined that the current signal in the ground line E is an interference signal, and the main control module 40 maintains the current state.
The utility model discloses a set up ground wire earth leakage protection module 30, detect the current signal in the ground wire E, and when the ground wire current signal reached the predetermined current threshold value, control tripolar gang switch 20 disconnection zero N, fire L, ground E three lines with the electrical connection of tripolar participate in 10, and output count signal, so that main control module 40, after receiving the count signal lasts first timing time, control tripolar gang switch 20 resume zero N, fire L, ground E three lines with the electrical connection of tripolar participate in 10; and meanwhile, counting the number of times of the received counting signal through the main control module 40, and controlling the three-pole linked switch 20 to disconnect the electrical connection between the zero-N, fire-L and ground-E circuits and the three-pole pin 10 when the counted number of times reaches the preset number of times in the second timing time. The utility model discloses avoided ground wire E electrified and made electric water heater when the electric leakage phenomenon appears, made the user have the dangerous problem of electric shock, still solved when the short-lived ground wire current signal that ground wire earth leakage protection module 30 detected is interference signal simultaneously, control electric water heater outage stop work, lead to earth leakage protection power plug line malfunction, influence user's normal use problem.
Referring to fig. 1 and 3, in a preferred embodiment, the ground leakage protection module 30 includes a first electromagnetic induction coil 31 for inducing the ground current signal, a ground current detection circuit 32 for amplifying the ground current signal, a first leakage detection chip 33 for performing an operation on the ground current signal, a trip circuit 34 for outputting a corresponding trip signal according to a trip instruction output by the first leakage detection chip 33, and a trip mechanism 35 for controlling the three-pole linked switch 20 to be turned off according to the trip signal;
the first electromagnetic induction coil 31 is arranged around the periphery of a ground wire E and is electrically connected with the input end of the ground wire current detection circuit 32; the output end of the ground current detection circuit 32 is connected with the input end of the first leakage detection chip 33, and the output end of the first leakage detection chip 33 is connected with the input end of the trip circuit 34; the output end of the tripping circuit 34 is connected with the controlled end of the tripping mechanism 35; the driving end of the tripping mechanism 35 is connected with the controlled end of the three-pole linked switch 20.
In this embodiment, when no leakage occurs in the ground wire E, there is no current signal in the ground wire E, or the current signal is relatively small and can be ignored, at this time, the sum of the currents in the first electromagnetic induction coil 31 is equal to zero N, and no voltage output exists in the first electromagnetic induction coil 31, when the electrical equipment has a leakage, the current signal penetrating into the first electromagnetic induction coil 31 is greatly unbalanced, the current signal is induced in the first electromagnetic induction coil 31, and a voltage signal proportional to the induced current is output at the output end. The ground current detection circuit 32 amplifies the voltage signal after receiving the voltage signal, and outputs the amplified voltage signal to the first leakage detection chip 33, so as to analyze and process the voltage signal, and when detecting that the current signal corresponding to the voltage signal is greater than a preset current value, outputs a trip instruction to the trip circuit 34. When receiving the tripping instruction, the trip circuit 34 outputs a tripping signal to the trip mechanism 35 to trigger the trip mechanism 35 to operate, and drives the three-pole linked switch 20 to be quickly disconnected, so as to control the three-pole linked switch 20 to disconnect the electrical connection between the three lines of zero N, fire L and ground E and the three-pole pin 10.
Referring to fig. 1 and fig. 3, further E, in the above embodiment, the trip circuit 34 includes a trip coil 341, a first trip thyristor 342, a second trip thyristor 343, a rectifier diode 344, and a charging and discharging capacitor 345, a first end of the trip coil 341 is interconnected with a cathode of the first trip thyristor 342, an anode of the rectifier diode 344, and a positive end of the first direct-current power source VCC1, and a second end of the trip coil 341 is connected with an anode of the second trip thyristor 343; the anode of the first tripping thyristor 342 is interconnected with the cathode of the rectifying diode 344 and the first end of the charging and discharging capacitor 345; the gates of the first tripping thyristor 342 and the second tripping thyristor 343 are respectively connected with the control ends of the main control module 40 and the first leakage detection chip 33; the cathode of the second trip thyristor 343 is interconnected with the second end of the charge and discharge capacitor 345 and the negative end of the first direct current power VCC 1.
In this embodiment, the first tripping thyristor 342 and the second tripping thyristor 343 are controlled by the main control module 40 and the first leakage detection chip 33, and are turned on when receiving the main control module 40 or the first leakage detection chip 33, so that the iron core of the tripping coil 341 transfers a tripping action to the tripping mechanism 35 after being attracted by power, the rectifier diode 344 is used for charging the charging and discharging capacitor 345 and can perform electrical isolation during discharging, and the charging and discharging capacitor 345 is used for storing energy when there is power transmission on the zero N fire L line and providing power to the tripping coil 341 when there is power failure on the zero N fire L line.
Referring to fig. 1 and 3, in a preferred embodiment, the main control module 40 includes a main control chip 41 configured to receive the counting signal, output a first control signal after receiving the counting signal for a first timing time, count the number of times of the received counting signal, and output a second control signal when detecting that the counted number reaches a preset number of times within a second timing time, a power-on action circuit 42 configured to control to output a power-on signal according to a recovery instruction output by the main control chip 41, and a power-on action mechanism 43 configured to control the three-pole linked switch 20 to be closed according to the power-on signal; wherein,
the input end of the main control chip 41 is connected to the output end of the ground leakage protection module 30, the first control end of the main control chip 41 is connected to the controlled end of the power-on action circuit 42, and the second control end of the main control chip 41 is connected to the input end of the trip circuit 34; the output end of the power-on action circuit 42 is connected with the input end of the power-on action mechanism 43; the driving end of the power-on actuating mechanism 43 is connected with the controlled end of the three-pole linked switch 20.
In this embodiment, the main control chip 41 may be implemented by an integrated chip such as a DSP and a single chip, a hardware circuit module such as a register and a counter for counting the number of times of the received count signal is integrated in the main control chip 41, and a software program module for analyzing and processing the received signal is also integrated in the main control chip 41, and each control function of the main control chip 41 is implemented by each hardware module and each software module integrated in the main control chip 41. After the main control chip 41 receives the counting signal and delays for the first time, it outputs a corresponding recovery instruction to the upper electric operating circuit 42 to control the upper electric operating circuit to output an upper electric signal to the upper electric operating mechanism, so as to control the three-pole linked switch 20 to recover the electrical connection between the three lines of zero N, fire L and earth E and the three-pole pin 10. When the counting number reaches the preset number, the main control chip 41 may determine that the current signal in the ground line E is a leakage signal rather than an interference signal, and output a corresponding trip instruction to the trip circuit 34, so that the trip circuit 34 drives the trip mechanism 35 to operate.
Referring to fig. 1 and fig. 3, based on the above embodiment, the leakage protection device further includes an alarm circuit 50, a controlled end of the alarm circuit 50 is connected to a third control end of the main control chip 41, and the main control chip 41 is further configured to control the alarm circuit 50 to operate when the counted number of times reaches a preset number of times within the second timing time.
In this embodiment, when the count number of the main control chip 41 reaches the preset number, it may be determined that the current signal in the ground line E is a leakage signal rather than an interference signal, and at this time, the main control chip 41 outputs an alarm instruction to the alarm circuit 50, so that the alarm circuit 50 performs a corresponding alarm operation. The alarm circuit 50 may be implemented by using an audible and visual alarm, such as a light emitting diode, an LED display screen, and a buzzer.
Referring to fig. 1 and 3, in a preferred embodiment, the earth leakage protection device further includes a power supply 60 for supplying power to the main control chip 41, a first input terminal and a second input terminal of the power supply 60 are respectively connected to the fire L line and the zero N line, and an output terminal of the power supply 60 is connected to a power supply terminal of the main control chip 41.
In this embodiment, the power supply 60 converts the ac power accessed from the zero N live line L into a suitable dc power after performing rectification and filtering processing, and outputs the dc power to the main control chip 41, so as to supply power to the main control chip 41. In this embodiment, the power supply 60 includes a rectifying unit 61, a voltage-reducing unit 62, and a voltage-stabilizing filtering unit 63. The rectifying unit 61 is configured to convert an ac power received by the zero N hot line L into a dc power, and the rectifying unit 61 may be implemented by a half-wave rectifying circuit or a full-wave rectifying circuit. The voltage reducing unit 62 may be implemented by a resistance-capacitance voltage reducing circuit, and reduces the rectified high-voltage direct current to low-voltage direct current. The voltage stabilizing and filtering unit 63 may be implemented by a three-terminal voltage stabilizing integrated circuit, a filter capacitor, and other components, so as to adjust the low-voltage direct current to a stable direct current.
Referring to fig. 1 and fig. 3, in a preferred embodiment, the earth leakage protection device further includes a zero fire power failure detection circuit 70 for detecting voltages of the fire L line and the zero N line, a detection end of the zero fire power failure detection circuit 70 is connected to the fire L line and the zero N line, and an output end of the zero fire power failure detection circuit 70 is connected to the main control chip 41;
the main control chip 41 is further configured to output the second control signal to the trip circuit 34 when receiving the zero fire L power down signal output by the zero fire power down detection circuit 70.
In this embodiment, the zero fire power failure detection circuit 70 processes the zero N fire L alternating voltage and outputs the processed voltage to the main control chip 41, and the main control chip 41 converts the voltage signal input by the zero fire power failure detection circuit 70 into a corresponding alternating voltage waveform, so as to determine whether the zero N fire L line is disconnected according to whether the alternating current outputs the voltage waveform, specifically, E, if the continuous no-waveform time Tln is greater than or equal to the set value Tln △, it is determined that the zero N fire L line is disconnected, and a tripping instruction is output to the tripping circuit 34, where the range of the set value Tln △ is generally within 5 s.
Referring to fig. 1 and 3, in a preferred embodiment, the leakage protection device further includes a zero-fire electromagnetic induction coil 81 for inducing the leakage signals of the fire L line and the zero N line, a zero-fire leakage detection circuit 82 for amplifying the leakage signals, and a second leakage detection chip 83 for performing an operation on the leakage signals;
the zero-fire electromagnetic induction coil 81 is annularly arranged on the periphery of a zero-N line and a fire-L line of the leakage protection plug and is electrically connected with the input end of the zero-fire leakage detection circuit 82; the output end of the zero-fire leakage detection circuit 82 is connected with the input end of the second leakage detection chip 83, and the output end of the second leakage detection chip 83 is connected with the input end of the trip circuit 34.
In this embodiment, when no leakage occurs in the electrical equipment, the current flowing through the live line L is equal to the current flowing through the zero line N, the sum of the currents in the coils is equal to zero N, the live electromagnetic induction coil 81 does not have voltage output, when leakage occurs in the electrical equipment, the current flowing through the live line L and the zero line N of the live electromagnetic induction coil 81 is unbalanced, a current signal is induced in the second electromagnetic induction coil, and a voltage signal proportional to the induced current is output at the output end. The zero-fire leakage detection circuit 82 amplifies the voltage signal after receiving the voltage signal, outputs the amplified voltage signal to the second leakage detection chip 83 to analyze the voltage signal, and outputs a tripping instruction to the tripping circuit 34 when detecting that the current signal corresponding to the voltage signal is greater than a preset current value. The range of the preset current value is generally within 30mA, and the preferable values are 5mA, 6mA, 10mA and 15 mA.
Referring to fig. 1 and 3, it can be understood that, according to the above-described embodiment, the leakage protection device may further include an over-temperature detection circuit 91 for detecting the temperature of the three-pole pin 10, a test switch 92 for performing a leakage test on the zero-voltage line, and a reset switch 93, where a fault such as a leakage or a short circuit occurs in the electric water heater or the line, or the reset switch 93 controls the three-pole gang switch 20 to return from the off state to the on state when receiving a reset key instruction input by a user after the test switch 92 controls the three-pole gang switch 20 to be off. The embodiment further includes a function expansion interface 94, such as a burning interface and a communication interface, for connecting the main control chip 41 to the outside.
The utility model discloses still provide an electric water heater, include as above electric leakage protection device. The detailed structure of the leakage protection device can refer to the above embodiments, and is not described herein; it can be understood, because the utility model discloses used above-mentioned earth leakage protection device in the electric water heater, consequently, the utility model discloses electric water heater's embodiment includes all technical scheme of the whole embodiments of above-mentioned earth leakage protection device, and the technical effect who reaches is also identical, no longer gives details here.
The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.
Claims (9)
1. An earth leakage protection device, characterized in that it comprises:
the three-pole pin and the zero, fire and ground circuits connected with the three-pole pin;
the three-pole linked switch is arranged on the zero line, the fire line and the ground line and controls the on/off of the zero line, the fire line and the ground line and the three-pole pin;
the control end of the ground wire leakage protection module is connected with the controlled end of the three-pole linked switch, and the ground wire leakage protection module is used for detecting a ground wire current signal, controlling the three-pole linked switch to disconnect the electrical connection between the zero, fire and ground lines and the three-pole pins when the ground wire current signal reaches a preset current threshold value, and outputting a counting signal;
the main control module is used for starting timing when the counting signal is received and controlling the three-pole linked switch to recover the electrical connection between the three lines of zero, fire and ground and the three-pole pin when the first timing time is up; and the number of the first and second groups,
and counting the number of times of the received counting signal, and controlling the three-pole linked switch to disconnect the three lines of the zero line, the fire line and the ground line from the three-pole pin according to the counted number of times in a second timing time.
2. The earth leakage protection device of claim 1, wherein the ground current detection module includes a first electromagnetic coil for inducing the ground current signal, a ground current detection circuit for amplifying the ground current signal, a first earth leakage detection chip for performing an operation on the ground current signal, a trip circuit for outputting a trip signal according to a trip instruction output by the first earth leakage detection chip, and a trip mechanism for controlling the three-pole link switch to be turned off according to the trip signal;
the first electromagnetic induction coil is annularly arranged on the periphery of a ground wire and is electrically connected with the input end of the ground wire current detection circuit; the output end of the ground wire current detection circuit is connected with the input end of the first electric leakage detection chip, and the output end of the first electric leakage detection chip is connected with the input end of the tripping circuit; the output end of the tripping circuit is connected with the controlled end of the tripping mechanism; and the driving end of the tripping mechanism is connected with the controlled end of the three-pole linked switch.
3. The earth leakage protection device of claim 2 wherein said trip circuit comprises a trip coil, a first trip thyristor, a second trip thyristor, a rectifier diode, and a charge-discharge capacitor, wherein a first end of said trip coil is interconnected with a cathode of said first trip thyristor, an anode of said rectifier diode, and a positive terminal of a first dc power source, and a second end of said trip coil is connected with an anode of said second trip thyristor; the anode of the first tripping controlled silicon is connected with the cathode of the rectifier diode and the first end of the charge-discharge capacitor; the grid electrodes of the first tripping controllable silicon and the second tripping controllable silicon are respectively connected with the main control module and the control end of the first leakage detection chip; and the cathode of the second tripping controllable silicon is interconnected with the second end of the charge-discharge capacitor and the negative end of the first direct-current power supply.
4. The earth leakage protection device of claim 2, wherein the main control module comprises a main control chip for receiving the counting signal, outputting a first control signal after receiving the counting signal for a first timing time, counting the number of times of the received counting signal, and outputting a second control signal when detecting that the counted number reaches a preset number within a second timing time, a power-on action circuit for controlling to output a power-on signal according to a recovery instruction output by the main control chip, and a power-on action mechanism for controlling to close the three-pole linkage switch according to the power-on signal; wherein,
the input end of the main control chip is connected with the output end of the ground wire leakage protection module, the first control end of the main control chip is connected with the controlled end of the power-on action circuit, and the second control end of the main control chip is connected with the input end of the tripping circuit; the output end of the power-on action circuit is connected with the input end of the power-on action mechanism; and the driving end of the power-on action mechanism is connected with the controlled end of the three-pole linked switch.
5. The earth leakage protection device of claim 4, further comprising an alarm circuit, wherein a controlled terminal of the alarm circuit is connected to a third control terminal of the main control chip, and the main control chip is further configured to control the alarm circuit to operate when the counted times reach a preset time within the second timing time.
6. The earth leakage protection device of claim 4, further comprising a power supply for supplying power to said main control chip, wherein a first input terminal and a second input terminal of said power supply are connected to said live line and neutral line, respectively, and an output terminal of said power supply is connected to a power supply terminal of said main control chip.
7. The earth leakage protection device of claim 4, further comprising a zero fire power-down detection circuit for detecting the voltage of the live line and the neutral line, wherein a detection end of the zero fire power-down detection circuit is connected with the live line and the neutral line, and an output end of the zero fire power-down detection circuit is connected with the main control chip;
the main control chip is also used for outputting the second control signal to the tripping circuit when receiving the zero-fire power-down signal output by the zero-fire power-down detection circuit.
8. The earth leakage protection device of claim 2, wherein said earth leakage protection device further comprises a zero-fire electromagnetic induction coil for inducing an earth leakage signal of said live line and said neutral line, a zero-fire earth leakage detection circuit for amplifying said earth leakage signal, and a second earth leakage detection chip for performing an operation on said earth leakage signal;
the zero-fire electromagnetic induction coil is annularly arranged on the peripheries of a zero line and a live line of the leakage protection plug and is electrically connected with the input end of the zero-fire leakage detection circuit; the output end of the zero-fire electric leakage detection circuit is connected with the input end of the second electric leakage detection chip, and the output end of the second electric leakage detection chip is connected with the input end of the tripping circuit.
9. An electric water heater comprising an earth leakage protection device according to any one of claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821137529.8U CN208859899U (en) | 2018-07-17 | 2018-07-17 | Earth leakage protective device and electric heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821137529.8U CN208859899U (en) | 2018-07-17 | 2018-07-17 | Earth leakage protective device and electric heater |
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| Publication Number | Publication Date |
|---|---|
| CN208859899U true CN208859899U (en) | 2019-05-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821137529.8U Withdrawn - After Issue CN208859899U (en) | 2018-07-17 | 2018-07-17 | Earth leakage protective device and electric heater |
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| Country | Link |
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| CN (1) | CN208859899U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110726249A (en) * | 2018-07-17 | 2020-01-24 | 芜湖美的厨卫电器制造有限公司 | Leakage protection device and method and electric water heater |
-
2018
- 2018-07-17 CN CN201821137529.8U patent/CN208859899U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110726249A (en) * | 2018-07-17 | 2020-01-24 | 芜湖美的厨卫电器制造有限公司 | Leakage protection device and method and electric water heater |
| CN110726249B (en) * | 2018-07-17 | 2024-04-26 | 芜湖美的厨卫电器制造有限公司 | Leakage protection device and method and electric water heater |
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Effective date of registration: 20230616 Address after: 241000 west side of 3 / F, No.5 office building, new energy and new materials gathering area, Fuzhou Road, Jiangbei District, Wuhu City, Anhui Province Patentee after: Wuhu Midea intelligent kitchen electricity Manufacturing Co.,Ltd. Address before: 241009 Wan Chun East Road, East District, Wuhu economic and Technological Development Zone, Anhui Patentee before: WUHU MIDEA KITCHEN AND BATH APPLIANCES MFG. Co.,Ltd. Patentee before: MIDEA GROUP Co.,Ltd. |
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