CN104184113B - A kind of SPA ponds and detection of electrical leakage control method with earth leakage detection functions - Google Patents
A kind of SPA ponds and detection of electrical leakage control method with earth leakage detection functions Download PDFInfo
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- CN104184113B CN104184113B CN201410443150.XA CN201410443150A CN104184113B CN 104184113 B CN104184113 B CN 104184113B CN 201410443150 A CN201410443150 A CN 201410443150A CN 104184113 B CN104184113 B CN 104184113B
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Abstract
The present invention provides a kind of control method for SPA ponds detection of electrical leakage, and whether the calandria for being heated to the SPA ponds, which leaks electricity, is detected, and is comprised the following steps：A. the first voltage of the test point position very first time is detected, the voltage is expressed as y (t)；B. the voltage difference between the first voltage and Initial Voltage Value is calculated, the voltage difference is expressed as △ y=| y (t) y (0) |；C. judge the voltage difference whether between first threshold and Second Threshold；If the voltage difference is between the first threshold and Second Threshold, the second voltage of the time of test point second is then detected again, if still between the first threshold and Second Threshold, the instruction for stopping powering to the calandria is sent to execution circuit for the voltage difference between the second voltage and the Initial Voltage Value.
Description
Technical Field
The invention relates to the field of SPA pools, in particular to a control method and a corresponding control device for detecting leakage of an SPA pool, and the SPA pool is preferably a sport and health care product.
Background
With the continuous development of science and technology, the quality of life is continuously improved, people pay more and more attention to the self health, but as the working pressure and the living pressure are increased, people often select a plurality of pressure reduction modes, the SPA is taken as a healthy leisure service for relieving pressure and relaxing skin and is favored by more and more people, people can relax in hearing, taste, touch, smell and vision through the SPA hydrotherapy, so that the pressure is relieved, and customers who do the SPA feel like heavy burden and relax from physiology to psychology.
According to the related data, SPA comprises cold water bath, hot and cold water bath, sea water bath, hot spring bath, and tap water bath, each bath can relax, relieve tense and tired muscles and nerves to some extent, eliminate toxin in vivo, prevent and treat diseases, and in addition hydrotherapy is combined with massage of various aromatic essential oils, can accelerate fat burning, and has slimming effect. The SPA promotes the circulation of the human body by matching with various rare trace elements, thereby achieving the effects of beautifying the face and the body; the pressure of the human body is relieved through hydrotherapy compression resistance; promoting perspiration through the heat effect, and achieving the purpose of slimming.
With the continuous development and extension of the SPA technology, elements such as negative ions and ozone are often added into the SPA to increase the curative effect of the SPA, but in general SPA rehabilitation, water in the SPA pool needs to be heated to maintain the comfort level of the SPA during the SPA rehabilitation, and a heater used by the SPA is often installed below the water level of the SPA pool, so that the phenomenon of electric leakage of the SPA pool can be caused, and some potential safety hazards are caused to people in the SPA pool.
Disclosure of Invention
Aiming at the technical defect that the SPA pool in the prior art does not have the function of monitoring and detecting electric leakage in real time, the invention aims to provide a control method for detecting the electric leakage of the SPA pool, which is used for detecting whether a heating body for heating the SPA pool leaks the electric leakage or not, and comprises the following steps:
a. detecting a first voltage at a first time at a detection point location, said voltage being denoted as y (t);
b. calculating a voltage difference value between the first voltage and an initial voltage value, the voltage difference value being expressed as Δ y ═ y (t) -y (0) |;
c. judging whether the voltage difference value is between a first threshold value and a second threshold value;
d. if the voltage difference value is between the first threshold value and the second threshold value, detecting a second voltage of the detection point at a second time again, and if the voltage difference value between the second voltage and the initial voltage value is still between the first threshold value and the second threshold value, sending an instruction of stopping supplying power to the heating body to an execution circuit.
Preferably, the control method for detecting the SPA pool electric leakage can also be used for detecting other electric parts for heating the SPA pool.
Preferably, in the step c, if the voltage difference is not between the first threshold and the second threshold, an instruction to stop supplying power to the heating body is directly issued to an execution circuit.
Preferably, the method further comprises the following steps before the step a:
and recording a second voltage for detecting the detection point after the heating body is started and before the heating body works, and taking the second voltage as the initial voltage value.
Preferably, the second voltage is detected 10 seconds before the heating body is operated.
Preferably, the first threshold is a set value.
Preferably, the first threshold is any one of the following values:
-0.1v；
-0.2v；
-0.25V；
-0.28V；
-0.3V；
-0.35V；
-0.5v；
-0.8v；
-1v；
-1.5v；
-1.8v；
-2v；
-2.5v；
-3v；
-3.5v；
-4v；
-4.5v；
-5 v; or
-5.1v。
Preferably, the second threshold is calculated by the following formula: the method comprises the following steps of | a first threshold value-an initial voltage value |/T, wherein T is the accumulated time length of the heating body from the beginning of working to the current time, and the accumulated time length is calculated by taking hours as a unit.
According to another aspect of the invention, a SPA pool with electric leakage detection function is provided, the SPA pool at least comprises a heating body which is used for heating the water contained in the SPA pool, it is characterized in that the heating body is connected with a power supply, and the power supply provides electric energy for the heating body, the SPA pool with the electric leakage detection function also comprises an electric leakage detection system, the electric leakage detection system at least comprises a detection unit and an execution unit, the detection unit is connected with a detection line, the other end of the detection line is connected with the shell of the heating body, the execution unit is used for controlling the power supply to supply electric energy to the heating body or stopping supplying the electric energy, and the detection unit sends a signal to the execution unit when detecting the electric leakage of the heating body so that the execution unit controls the power supply to stop supplying the electric energy to the heating body.
Preferably, the other end of the detection line is connected to any one of the following components: a housing for the heating body; or, a conductor portion of the heating body.
Preferably, the other end of the detection line is connected to the heating body through a separation element.
Preferably, the isolation element is any one of the following elements: a safety capacitor; hall elements, wherein the number of the detection lines is three; a transformer; alternatively, an optocoupler.
Preferably, the sensing line is connected to a first pin of the sensing unit.
Preferably, a protective impedance element is further connected between the detection line and the detection unit.
Preferably, the protective impedance element comprises any one of the following components: a first capacitor; a series circuit of a first capacitor and a second capacitor; or a series circuit of the first capacitor, the second capacitor and the third capacitor.
Preferably, the second pin of the detection unit is connected with a detection circuit, the detection circuit includes a parallel circuit formed by a series circuit composed of a fourth capacitor, a fifth capacitor and a first resistor and a series circuit composed of a sixth capacitor and a seventh capacitor, and the detection circuit is connected in parallel with the heating body through a second resistor.
Preferably, a second pin of the detection unit is connected to a detection circuit, an L \| N end of the detection circuit is connected to an eighth capacitor, the other end of the eighth capacitor is connected in series with the ninth capacitor and the third resistor, and then connected in parallel with one end of a fourth resistor, and then connected to a cathode of a first diode, an anode of the first diode is connected to a cathode of a second diode, an anode of the second diode is connected to a cathode of a third diode, a series circuit composed of the first diode, the second diode and the third diode is respectively connected in parallel with one end of a sixteenth capacitor, one end of a fourteenth capacitor and one end of a seventh resistor, one end of a tenth capacitor is connected to an eleventh capacitor, and a series circuit composed of the tenth capacitor and the eleventh capacitor, a series circuit composed of the twelfth capacitor, the thirteenth capacitor, the sixth resistor and the fifth resistor, and then connected in parallel with the other end of the fourth resistor, The other end of the sixteenth capacitor, the other end of the fourteenth capacitor, the other end of the seventh resistor, one end of the seventeenth capacitor, one end of the fifteenth capacitor, and one end of the eighth resistor, a cathode of the fourth diode is connected between the sixth resistor and the fifth resistor, a cathode and an anode of the fifth diode are respectively connected to an anode of the fourth diode and a cathode of the sixth diode, and a series circuit composed of the fourth diode, the fifth diode, and the sixth diode is respectively connected in parallel with the other ends of the seventeenth capacitor, the fifteenth capacitor, and the eighth resistor.
Preferably, the execution unit comprises at least one relay for controlling the closing or opening of a switch between the power supply and the heating body according to the control from the detection unit.
The control method for detecting the SPA pool leakage realizes dynamic protection of the leakage by quantifying the leakage degree into the integral of the leakage current and the leakage voltage and the action time of the leakage current and the integral of the leakage voltage and the action time of the leakage voltage and by a weighted sliding average prediction method.
More specifically, the control method for detecting the leakage of the SPA pool is effective in real-time judgment of the leakage of the SPA pool in various service environments and various SPA pool bodies with different insulation strengths and protection of dynamic leakage change, meets the safety requirements, and further can be applied to the field of dynamic protection of SPA pools with time step characteristics, various service environments and various insulation strengths.
Drawings
Fig. 1 shows a specific flow chart for detecting whether the heater heated by the SPA pool leaks electricity according to an embodiment of the present invention;
FIG. 2 illustrates a diagram of the structural relationship between modules in the SPA pool, according to one embodiment of the present invention;
FIG. 3 illustrates a topology of the electrical leakage detection system in the SPA pool, according to an embodiment of the present invention;
FIG. 4 shows a partial circuit diagram of the electrical leakage detection system in the SPA pool, according to an embodiment of the present invention;
FIG. 5 shows a schematic electrical circuit diagram of the electrical leakage detection system in the SPA pool, according to another embodiment of the present invention; and
fig. 6 shows a schematic circuit diagram of the electrical leakage detection system in the SPA pool, in accordance with an embodiment of the present invention.
Description of the figures
1. SPA pool
2. Heating body
21. Conductor 22, insulator
23. Charged body
3. Power supply
4. Electric leakage detection system
41. Detection unit 42 and execution unit
5. Other control circuits
6. Water (W)
7. Relay with a movable contact
8. Detection line
9. Hall element
Detailed Description
In order to better and clearly show the technical scheme of the invention, the invention is further described with reference to the accompanying drawings.
Fig. 1 shows a specific flowchart for detecting whether there is electrical leakage in a heating body for heating the SPA pool according to an embodiment of the present invention, specifically, fig. 1 shows a control method for detecting electrical leakage in the SPA pool, further, whether there is electrical leakage in the heating body for heating the SPA pool is not limited to the control method, and the control method is only a preferred example shown for the embodiment of the present invention, and specifically, includes the following steps:
first, step S101 is performed to detect a first voltage at a first time at a detection point position, where the voltage is denoted by y (t), and those skilled in the art understand that the detection point is a detection position capable of reflecting whether a detection body is leaking, and is an optimal position obtained through technical research and numerous detections of those skilled in the art, and by detecting the detection point, the voltage at the position can be detected, preferably, the optimal position is close to the detection circuit, and the optimal position is denoted as point a. The voltage measurement is obtained by related instrumentation in the field, such as capacitance, sensors, etc., and more specifically, the detection circuit will be described in detail in the embodiments of the present invention, which is not described herein.
The y (t) is the voltage detected at the detection point after the heating body working time t of the SPA pool, and further, in a preferable variation, the y (t) may be t seconds after the heating body is startedkThe time is measured, and the time t is measured, and those skilled in the art understand that the above variation belongs to the specific implementation of the voltage measurement, and does not affect the technical solution of the present invention, and is not described herein again. A
The skilled person understands that the purpose of detecting the first voltage at the first time of the detection point position is to monitor the real-time voltage of the heating body, and to perform calculation analysis on the electric leakage condition of the heating body according to the real-time voltage, so as to determine whether the heating body leaks electricity, and further, to perform corresponding technical processing on the heating body.
Preferably, before executing the step S101, those skilled in the art should also perform the following processing for the embodiment: and recording a first voltage for detecting the detection point after the heating body is started and before the heating body works, and taking the first voltage as the initial voltage value. Preferably, the initial voltage value y (0) is represented by y (0), where the initial voltage value y (0) refers to a voltage after the heating body is started but is not yet operating, and the initial voltage value y (0) can reflect a voltage status in a current state, and is compared with the detected voltage in the step S101 to perform further technical processing, and the technical processing will be described in detail in the step S102 and will not be described herein again.
Those skilled in the art understand that in a preferred variant, according to the specific procedure for detecting the initial value of the voltage in the above embodiment, the first voltage is preferably detected 10 seconds before the heating body is operated. Specifically, those skilled in the art understand that, in order to effectively detect the first voltage and sufficiently reflect the leakage condition, the time for detecting the first voltage in advance should not be too long or too short, and the detection of the initial voltage in advance by 10 seconds is a preferred scheme obtained according to a lot of experiments and calculations by those skilled in the art, and further, in another preferred variation, the initial voltage may also be detected in advance by 5 seconds, which does not affect the analysis and calculation of the leakage condition, and is not described herein again.
After step S101 is completed, step S102 is performed to calculate a voltage difference between the first voltage and the initial voltage value, the voltage difference value is represented as ay ═ y (t) -y (0), preferably, in the leakage detection system of the SPA pool, a calculation module is arranged and used for calculating the voltage difference value between the first voltage and the initial voltage value, in particular, the step S101 is used for obtaining y (t), before the step S101, y (0) is obtained, and further, Δ y is obtained by executing an algorithm | y (t) -y (0) |, the Δ y is the variation of the voltage of the heating body after the operating time t, as understood by a person skilled in the art, the voltage variation can fully reflect whether the heating body has electric leakage or not and the weight of the electric leakage condition.
Then, step S103 is performed to determine whether the voltage difference is between the first threshold and the second threshold. The first threshold is an experimental constant, which is a constant calculated by a person skilled in the art through a large number of experiments, and is preferably a set value, and specifically, the first threshold is between 0.1v and 5.1 v.
Those skilled in the art understand that, in a preferred variation, the first threshold is 0.3V, specifically, the value of the first threshold affects the position of the interval where Δ y is located, and further, the leakage detection system adopts different solutions for different intervals, so that the working scheme of the entire leakage detection system is affected under certain conditions. Further, the first threshold may also be selected from 0.25V, 0.28V, 0.35V, and the like, but the first threshold is preferably between 0.2V and 0.5V, and preferably, a person skilled in the art understands that the selection of the first threshold may be manually configured or a value of the first threshold may be embedded in an embedded chip of the leakage detection system, which is not described herein again.
Those skilled in the art will appreciate that the second threshold is preferably calculated using the following equation: the method comprises the following steps of | a first threshold value-an initial voltage value |/T, wherein T is the accumulated time length of the heating body from the beginning to the current time, and the accumulated time length is calculated by taking hours as a unit. Furthermore, it is known from the formula that the first threshold is a constant, the initial voltage value will not change after being detected, and further, the second threshold will become smaller along with the accumulation of time.
Further, those skilled in the art understand that the SPA pool leakage detection system preferably sets two thresholds, and accordingly adopts different solutions for the voltage difference belonging to different threshold ranges, quantizes the change degree of the leakage as the integral of the leakage current and the leakage voltage with their action time, and implements dynamic protection of the leakage by a weighted sliding average prediction method, and more specifically, quantizes the change degree of the leakage as the integral of the leakage current and the leakage voltage with their action time in the specific embodiment of the present invention, which will not be described herein again.
After the step S103 is completed, in a preferred variation, if the voltage difference is not between the first threshold and the second threshold, the execution circuit is directly sent to stop sending the voltage difference to the execution circuitAnd the heating body supplies power. Preferably, the first threshold is assumed to be U1The second threshold is U2When the U2 is greater than △ y is greater than U1, it indicates that the heater may have a leakage phenomenon, and further detection of the heater is required, and the detection method will be described in detail in step S104.
Preferably, if the voltage difference is not between the first threshold and the second threshold, i.e. when Δ y > U2 or U1 > - Δ y, step S105 is executed to directly issue an instruction to stop supplying power to the heating body to the execution circuit, specifically, when Δ y > U2, the voltage variation is very large, and those skilled in the art understand that the leakage is very serious and should report a fault immediately and lock the whole product as it cannot work any more, when U1 > - Δ y, analysis can be divided into two cases, if the heating body is not working, the U1 > - Δ y or the Δ y is equal to 0, which indicates that the Δ y is very small, possibly due to too small voltage caused by fault defect on hardware such as no wire connection or lack of related function, and further, step S105 is executed; if the heating element is in normal operation, U1 >. DELTA.y indicates that the heating element is not in the leakage state.
Furthermore, the skilled person will understand that if U2 >. Δ y > U1, the heater needs to be detected again, specifically, a second voltage at a second time of the detection point is detected, and if the voltage difference between the second voltage and the initial voltage value is still between the first threshold and the second threshold, an instruction to stop supplying power to the heater is issued to the execution circuit.
Those skilled in the art understand that the second voltage at the second time refers to a voltage value detected by the detection circuit again, preferably, when U2 >. ay > U1, the power supply to the heating body should be immediately cut off, several seconds later, the heating body should be re-powered, 10 seconds before power supply, the initial voltage value is recorded, the initial voltage value is different from y (0), further, the voltage difference is calculated according to the second voltage, the threshold interval where the voltage difference is located is judged again, further, if the voltage difference is still between the first threshold and the second threshold, the heater is indicated to have a leakage phenomenon during operation, and an instruction to stop power supply to the heating body is sent to the execution circuit. If the voltage difference value is smaller than the first threshold value, the heating body can be preliminarily judged to work normally, tracking monitoring is still needed, and if the voltage difference value is larger than the second threshold value, power supply is immediately stopped.
Preferably, a person skilled in the art understands that the voltage difference can also be represented by converting the voltage difference into the size of the insulation layer resistance through a large amount of scientific calculations, and specifically, when the insulation resistance of the heating body falls below a set value, the detection circuit sends a power supply stop instruction to the execution circuit, so that the power supply to the heating body is cut off, and the leakage protection is realized.
Fig. 2 shows a structural relationship diagram between modules in the SPA pool according to an embodiment of the present invention, where only a partial cross-sectional view of the SPA pool is shown, and the SPA pool is not a complete SPA pool system, for example, only a part of water and a part of the outer wall of the SPA pool are shown in the diagram, and further, the positions of the modules shown are only a specific embodiment of the present invention, and may have other expressions, which do not affect the technical solution of the present invention, and are not described herein again.
Further, fig. 2 is a diagram for better illustrating the connection correspondence relationship between the electric leakage detection system and the heating body and the SPA pool, specifically:
the heating body 2 is in contact with the water 6 in the SPA water pool 1 and is used for heating the water 6 in the water pool 1. The heating body is preferably covered with an insulating material and covered with a conductor on the surface layer.
Furthermore, the heating body 2 is connected to a power supply 3, and the power supply 3 continuously supplies power to the heating body 2. The power supply 3 can also control other circuits and systems, and further, the power supply 3 can use an independent power supply and can also use the power supply provided by the SPA generation.
More specifically, heating member 2 is connected electric leakage detection system 4, electric leakage detection system 4 can provide real-time electric leakage detection condition to judge whether stop providing for heating member 2 power supply through the information of real-time detection.
Preferably, the leakage detecting system 4 further includes a detecting circuit and an executing circuit (not shown in the figure), which will be specifically described in the detailed description, and will not be described herein again.
Furthermore, the leakage detecting system 4 is further connected to other control circuitry 5, and the other control circuitry 5 belongs to the prior art and is not described herein again.
Fig. 3 shows a structural topology diagram of the electrical leakage detection system in the SPA pool according to an embodiment of the present invention, as shown in the figure, the electrical leakage detection system 4 at least includes a detection unit 41 and an execution unit 42, the detection unit 41 is connected to one end of a detection line 8, the other end of the detection line 8 is connected to the heating body 2, the execution unit 42 is configured to control the power supply 3 to supply power to the heating body 2 or stop supplying power, and the detection unit 41 sends a signal to the execution unit 42 when detecting that the heating body 2 is electrically leaked, so that the execution unit 42 controls the power supply 3 to stop supplying power to the heating body 2.
The detection unit 42 is configured to detect whether the heating body 2 leaks electricity, specifically, the working process refers to the specific embodiment of fig. 1, further, if it is detected through the detection that the heating body 2 leaks electricity, the detection circuit 41 sends an instruction request for stopping supplying power to the heating body 2 to the execution circuit 42, and the execution circuit 42 is configured to control the power supply 3 to supply electric energy to the heating body 2 or stop supplying electric energy, so that the electric leakage condition of the heating body can be effectively monitored and potential safety hazards caused by the electric leakage condition can be effectively prevented through the above control method.
Further, the detection unit is connected to a detection line 8, the other end of the detection line 8 is connected to the heating body 2, the detection line 8 is used for detecting the real-time voltage of the heating body 2, and the leakage condition of the heating body is analyzed and processed by a formula Δ y ═ y (t) -y (0) |, in fig. 1. More specifically, the other end of the detection wire 8 is preferably connected to a housing of the heating body 2, which is preferably covered with a conductor 23, and the specific description of the conductor 23 will be detailed in the description of the heating body 2 in fig. 3, and will not be repeated herein. In another preferred variant, the other end of the detection wire 8 may also be connected to a specific part of the heating body 2 or to another part of the electrical leakage detection system 4.
As understood by those skilled in the art, in another preferred variant, a separation element is placed on the heating body, the detection wire 8 is preferably connected to the separation element, and further, the separation element is any one of the following elements: hall element, mutual-inductor, opto-coupler, electric capacity. The hall element refers to a magnetic sensor based on the hall effect, and the hall element is functionally identical to the transformer and the optocoupler as understood by those skilled in the art. More specifically, as shown in fig. 5, the hall element is connected to the heating body, and three detection lines are connected to the hall element and the detection unit, respectively. Those skilled in the art understand that through the conduction of the hall element, voltage or resistance or current information of the heating body can be obtained, so that whether the heating body is charged or not can be judged; if the electricity is charged, the electricity leakage of the heating body is indicated, the detection unit sends an instruction signal to the execution unit, and the execution unit stops supplying power to the heating body. Further, those skilled in the art can implement the working mechanism of the embodiment shown in fig. 5 with reference to fig. 4 described below, which is not described herein again.
Preferably, the sensing line 8 is connected to a first pin of the sensing unit 41. The detection unit 41 may have a plurality of pins, where the pins refer to connection wires leading from an internal circuit to a peripheral circuit, and the pins are used to connect the detection line 8 and the detection unit 41.
Preferably, an impedance element is further connected between the detection line 8 and the detection unit 41. The impedance element refers to an element such as a resistor, an inductor, and a capacitor that can block a current in a circuit. Specifically, an impedance element is connected between the detection line 8 and the detection unit 41 to protect impedance and limit current, and further, the electric leakage detection system 4 detects the voltage at the point a through the circuit.
Preferably, as shown in the figure, two capacitors, respectively C1 and C2, are arranged between the detection line 8 and the detection unit 41, and are used for protecting impedance and limiting current, and the two capacitors are connected in series, further, those skilled in the art understand that in a preferred variation, one capacitor or three capacitors or more capacitors may also be arranged between the detection line 8 and the detection unit 41, which does not affect the technical solution of the present invention and is not described herein again.
In another preferred variant, the protective impedance may not be employed between the detection line 8 and the detection cell 41 if the housing of the heating body 2 is substantially insulated, more particularly if it is substantially insulated at the point where the detection line 8 is connected to the heating body 2, i.e. has an insulation protection above the substantial insulation from the water 6.
Further, as shown in fig. 3, the execution circuit 42 directly controls the power supply of the heating body 2, and a relay is preferably interposed between the execution circuit 42 and the heating body 2, and the relay controls the power supply of the heating body 2 through a switch, and further, the switch is controlled through the execution circuit 42. Preferably, the power supply 3 is connected to the execution circuit, and the relay is used for controlling the on/off of the switch between the power supply 3 and the heating body 2 according to the control from the detection unit 41.
As shown in fig. 3, the innermost layer of the heating body 2 is a charged body 23 which continuously releases heat energy after being electrified, the middle layer is an insulating layer 22, the insulating layer 22 is preferably a polyimide film, more specifically, the insulating layer is preferably a 3.5-layer polyimide film, in a preferred variation, the insulating layer material can be replaced by other insulating materials, and the insulating materials have the characteristics of water tightness, electric leakage resistance, high temperature resistance and the like. The outermost layer is a conductor 21, said conductor 21 being able to conduct the electrical leakage on the surface of said insulating layer to said conductor 21, and to detect the electrical leakage of said heating body 2, it being understood by those skilled in the art that said conductor 21 may also function as a protection for said insulating layer 22.
Preferably, the detection circuit 41 is further connected to another control circuit 5, and a live wire and a neutral wire are preferably disposed in the other control circuit 5 to form a potential difference with the detection point a to form a path.
Fig. 4 shows a partial circuit diagram of the electric leakage detection system in the SPA pool according to an embodiment of the present invention, and it is understood by those skilled in the art that the second pin of the detection unit is connected to a detection circuit, the detection circuit includes a parallel circuit formed by a series circuit composed of a fourth capacitor, a fifth capacitor, a first resistor, and a series circuit composed of a sixth capacitor and a seventh capacitor, and the detection circuit is connected in parallel to the heating body through a second resistor, in the figure, L indicates a live wire, N indicates a zero wire, C1, C2, C4, C5, C6, and C7 are capacitors, and the capacitors are used for protecting impedance and limiting current. A resistor R1 is connected in series with the capacitors C4 and C5, the R1 is used for signal detection, the detection circuit is connected in parallel with the heating body through a resistor R2, the R2 is used for current limiting, and point a in fig. 4 is the detection point.
Further, referring to the embodiments shown in fig. 1 to fig. 4, it is understood by those skilled in the art that, in a preferred embodiment, the present invention provides a method for detecting leakage of an SPA product based on a weighted moving average prediction method, where the degree of change in leakage is quantized into an integral of leakage current and leakage voltage with their action time, and dynamic protection for leakage is implemented by a weighted moving average prediction method. The invention also provides a method for judging the leakage of the SPA product in real time by adopting an absolute variable method based on the actual use scene and the actual circuit element parameters. Furthermore, the grounding unit is not needed to monitor the electric leakage, and the threshold protection is carried out on the system.
The experimental result shows that the method is effective in real-time judgment of electric leakage of the SPA water pool bodies in various use environments and different insulation strengths and protection of dynamic electric leakage change, meets the safety requirements, and can be applied to the field of dynamic protection of the SPA water pool bodies with time step characteristics, various use environments and various insulation strengths.
In conjunction with the embodiments shown in fig. 1 to 4, the present invention provides a leakage detection system for SPA products:
the system uses capacitors or sensors to collect leakage voltage and leakage current and the value of the insulation strength between the charged body and water.
And (II) the system can use independent power supply and also can use power supply provided by SPA products.
And (III) the system isolates signals by using a capacitor, an optical coupler, a mutual inductor or a Hall element.
And (IV) quantizing the electric leakage degree into the integral of the leakage current and the leakage voltage and the action time of the leakage current and the leakage voltage on software, and realizing the dynamic protection of the electric leakage by a weighted moving average prediction method.
And (V) recording the feedback value of all the set leakage power sources before power-on by the system, and taking the feedback value as a reference to eliminate the interference of environment and parameter difference of parts of the system.
And (VI) the system uses a lead to be directly connected or connected with the tested body through certain impedance.
Further, those skilled in the art understand that the detection principle of the leakage detection system is as follows:
the insulation resistance of the electrified appliance is judged, and when the insulation resistance is reduced and reaches a threshold value, the electrified appliance is protected.
And judging the voltage of the point A, and protecting after the voltage reaches a threshold value.
And judging the current of the point A to the analog ground, and protecting the point A after the current reaches a threshold value.
Further, the principle of the software detection is as follows:
first, the value of the a-point feedback signal is monitored in real time, where y is the initial value of system operation, y (0), y (t) after time t, y (t) ═ f (t), and Δ y ═ y (t) -y (0) |. Let the threshold 1 be U1 (constant, experimental data), the threshold 2 be U2, and the system cumulative run time be T.
Preferably, 10s before PTC operation, an initial value y (0) is recorded;
furthermore, when the first detection judgment U2 is greater than Δ y > U1, Δ y value needs to be calculated again in the detection, and when the second detection judgment U2 is also greater than Δ y > U1, the controller execution circuit stops supplying power to the heater and reports an error code.
Furthermore, when the detection judgment delta y is equal to 0, immediately reporting a fault, locking the whole product to prevent the product from working any more, otherwise, continuing to electrify and monitor, and updating y (0) and U2;
more specifically, when Δ y > U2, a fault is reported immediately and the entire product is locked out of operation.
However, U2 becomes smaller as the value of | U1-y (0) |/T becomes smaller.
Those skilled in the art understand that, as shown in fig. 3, the leakage detection principle of the leakage detection system is as follows:
those skilled in the art will appreciate that the electrical leakage detection is made up of a detection circuit and an actuator circuit, as shown in the right part of fig. 3, and the housing of the charged body PTC-heater is connected to the detection circuit by a wire.
Preferably, the detection circuit detects the insulation resistance of the charged body in real time through the connection lead, outputs a control command when the insulation resistance of the charged body (PTC heater) drops to a set value such as 10 megaohms, and cuts off power supply to the charged body (PTC heater) through the execution circuit, thereby implementing leakage protection.
Further, referring to the embodiments shown in fig. 1 to fig. 5, it is understood by those skilled in the art that the leakage detecting system includes a detecting unit, and the second pin of the detecting unit is connected to a detecting circuit, which may be implemented by various embodiments. For example, fig. 6 shows a schematic circuit diagram of the electrical leakage detection system, in particular a schematic circuit diagram of the detection circuit, in the SPA pool according to an embodiment of the present invention. Specifically, the L _ | N end of the detection circuit is connected to an eighth capacitor, the other end of the eighth capacitor is connected to the ninth capacitor and the third resistor in series and then connected to one end of the fourth resistor in parallel, the anode of the first diode is connected to the cathode of the second diode, the anode of the second diode is connected to the cathode of the third diode, a series circuit composed of the first diode, the second diode and the third diode is connected to one end of a sixteenth capacitor, one end of a fourteenth capacitor and one end of a seventh resistor in parallel, one end of a tenth capacitor is connected to an eleventh capacitor, a series circuit composed of the tenth capacitor and the eleventh capacitor and a series circuit composed of the twelfth capacitor, the thirteenth capacitor, the sixth resistor and the fifth resistor are connected to the other end of the fourth resistor and the other end of the sixteenth capacitor in parallel, The other end of the fourteenth capacitor, the other end of the seventh resistor, one end of the seventeenth capacitor, one end of the fifteenth capacitor, and one end of the eighth resistor, a negative electrode of the fourth diode is connected between the sixth resistor and the fifth resistor, a negative electrode and a positive electrode of the fifth diode are respectively connected to an anode of the fourth diode and a negative electrode of the sixth diode, and a series circuit formed by the fourth diode, the fifth diode, and the sixth diode is respectively connected in parallel with the other ends of the seventeenth capacitor, the fifteenth capacitor, and the eighth resistor.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (13)
1. An electric leakage detection control method for an SPA pool, which is used for detecting whether an electric leakage exists in a heating body (2) which is used for heating the SPA pool through an electric leakage detection system, and is characterized in that the heating body (2) is connected with a power supply, the power supply provides electric energy for the heating body (2), the electric leakage detection system at least comprises a detection unit, the detection unit is connected with a detection line, and the other end of the detection line is connected with the heating body, and the electric leakage detection control method comprises the following steps:
a. detecting a first voltage at a first time at a detection point location, said voltage being denoted as y (t);
b. calculating a voltage difference value between the first voltage and an initial voltage value, the voltage difference value being expressed as Δ y ═ y (t) -y (0) |;
c. judging whether the voltage difference value is between a first threshold value and a second threshold value;
d. if the voltage difference value is between the first threshold value and a second threshold value, detecting a second voltage of the detection point at a second time again, and if the voltage difference value between the second voltage and the initial voltage value is still between the first threshold value and the second threshold value, sending an instruction of stopping supplying power to the heating body to an execution circuit;
in step c, if the voltage difference is not between the first threshold and the second threshold, then: when the voltage difference value is larger than a second threshold value, directly sending an instruction for stopping supplying power to the heating body to an execution circuit; when the voltage difference is smaller than a first threshold value, analyzing the two conditions: if the heating body does not work, directly sending an instruction for stopping supplying power to the heating body to an execution circuit; if the heating body is in normal operation, the electric leakage condition of the heating body does not exist;
the first threshold value is a set value;
the second threshold is calculated by the following formula: a first threshold value-an initial voltage value, |/T, where T is an accumulated time length of the heating body from the start of operation to the current time;
recording and detecting a first voltage of the detection point after the heating body is started and before the heating body works, and taking the first voltage as the initial voltage value;
the first time is 5 seconds to 10 seconds.
2. The control method according to claim 1, characterized by further comprising, before the step a, the steps of:
and recording a first voltage for detecting the detection point after the heating body is started and before the heating body works, and taking the first voltage as the initial voltage value.
3. The control method according to claim 2, characterized in that the first voltage is detected 10 seconds before the heating body is operated.
4. Control method according to claim 1, characterized in that the first threshold value is between 0.1v and 5 v.
5. The control method according to claim 4, characterized in that the first threshold value is any one of the following values:
0.1v；
0.2v；
0.25V；
0.28V；
0.3V；
0.35V；
0.5v；
0.8v；
1v；
1.5v；
1.8v；
2v；
2.5v；
3v；
3.5v；
4v；
4.5 v; or
5v。
6. An SPA pond with electric leakage detects function, SPA pond (1) includes heating member (2) at least, heating member (2) are used for heating the water that holds in SPA pond (1), its characterized in that, SPA pond (1) still includes: the outer wall of the pool; the SPA pool with the electric leakage detection function further comprises an electric leakage detection system, the electric leakage detection system at least comprises a detection unit and an execution unit, the detection unit is connected with one end of a detection line, the detection line is connected with a first pin of the detection unit, the other end of the detection line is connected with the heating body, the execution unit is used for controlling the power supply to provide electric energy for the heating body (2) or stopping providing the electric energy, and the detection unit sends a signal to the execution unit when detecting that the heating body (2) is in electric leakage so that the execution unit controls the power supply to stop providing the electric energy for the heating body (2);
a second pin of the detection unit is connected with a detection circuit, an L _ IN end of the detection circuit is connected with an eighth capacitor, the other end of the eighth capacitor is connected with a ninth capacitor and a third resistor IN series and then connected with one end of a fourth resistor IN parallel, then connected with an anode of a first diode, a cathode of the first diode is connected with an anode of a second diode, a cathode of the second diode is connected with an anode of a third diode, a series circuit composed of the first diode, the second diode and the third diode is respectively connected with one end of a sixteenth capacitor, one end of a fourteenth capacitor and one end of a seventh resistor IN parallel, a PTC-conductor end of the detection circuit is connected with a tenth capacitor, an N _ IN end of the detection circuit is connected with a twelfth capacitor, one end of the tenth capacitor is connected with an eleventh capacitor, and the series circuit composed of the tenth capacitor and the eleventh capacitor and the twelfth capacitor are connected, A series circuit composed of a thirteenth capacitor, a sixth resistor and a fifth resistor is connected in parallel and then connected to the other end of the fourth resistor, the other end of the sixteenth capacitor and the other end of the fourteenth capacitor, the other end of the seventh resistor, one end of a seventeenth capacitor, one end of a fifteenth capacitor and one end of an eighth resistor, an anode of a fourth diode is connected between the sixth resistor and the fifth resistor, an anode and a cathode of a fifth diode are respectively connected to a cathode of the fourth diode and an anode of the sixth diode, and a series circuit composed of the fourth diode, the fifth diode and the sixth diode is respectively connected in parallel with the other ends of the seventeenth capacitor, the fifteenth capacitor and the eighth resistor.
7. The SPA pool of claim 6, wherein the other end of the inspection line is connected to any one of the following components:
a housing for the heating body; or
A conductor portion of the heating body.
8. The SPA pool of claim 6, wherein the other end of the inspection line is connected to the heating body through a spacer element.
9. The SPA pool of claim 8, wherein said isolation element is any one of the following elements:
a safety capacitor;
hall elements, wherein the number of the detection lines is three;
a transformer; or,
and an optical coupler.
10. SPA pool according to any one of claims 6 to 9 wherein a protective impedance element is also connected between said detection line and said detection cell.
11. The SPA pool of claim 10, wherein said protective impedance element comprises any one of the following components:
a first capacitor;
a series circuit of a first capacitor and a second capacitor; or,
a series circuit of a first capacitor, a second capacitor and a third capacitor.
12. The SPA pool of any one of claims 6-9, wherein the second pin of the detection unit is connected to a detection circuit, the detection circuit comprises a parallel circuit formed by a series circuit of a fourth capacitor, a fifth capacitor, a first resistor, and a series circuit of a sixth capacitor and a seventh capacitor, and the detection circuit is connected in parallel to the heating body through a second resistor.
13. SPA pool according to any one of claims 6 to 9, wherein said actuator unit comprises at least one relay for controlling the closing or opening of a switch between said power source and said heating body according to the control signals from said detection unit.
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| CN104515933A (en) * | 2014-12-12 | 2015-04-15 | 国家电网公司 | Leak current fault detecting method and device |
| CN104891300A (en) * | 2015-06-29 | 2015-09-09 | 周志鸿 | Lift electric leakage detection device and system |
| CN106707032A (en) * | 2017-01-19 | 2017-05-24 | 厦门昰能机电科技有限公司 | Ground wire resistance value detection circuit |
| CN113687269A (en) * | 2021-09-23 | 2021-11-23 | Tcl家用电器（合肥）有限公司 | Heating pipe monitoring circuit and monitoring method thereof and washing machine |
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| CN201608504U (en) * | 2009-12-19 | 2010-10-13 | 张明澄 | Leakage and short circuit overcurrent double-protection safety device of electric water heater |
| CN103887763A (en) * | 2014-04-22 | 2014-06-25 | 重庆大学 | Electric device leakage protection device based on equipotential detection |
| CN204118688U (en) * | 2014-09-02 | 2015-01-21 | 东辉休闲运动用品(上海)有限公司 | A kind of SPA pond with earth leakage detection functions |
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| CN201608504U (en) * | 2009-12-19 | 2010-10-13 | 张明澄 | Leakage and short circuit overcurrent double-protection safety device of electric water heater |
| CN103887763A (en) * | 2014-04-22 | 2014-06-25 | 重庆大学 | Electric device leakage protection device based on equipotential detection |
| CN204118688U (en) * | 2014-09-02 | 2015-01-21 | 东辉休闲运动用品(上海)有限公司 | A kind of SPA pond with earth leakage detection functions |
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Denomination of invention: A SPA water tank with leakage detection function and leakage detection control method Granted publication date: 20171208 Pledgee: Shanghai Bank Co.,Ltd. Fengxian Branch Pledgor: Oriental Recreational Products (Shanghai) Co.,Ltd. Registration number: Y2024980011993 |