CN104184113B - A kind of SPA ponds and detection of electrical leakage control method with earth leakage detection functions - Google Patents

Abstract

The present invention provides a control method for SPA pool leakage detection, which is used to detect whether the heating body for heating the SPA pool is leaking, comprising the following steps: a. Detecting the first voltage at the first time at the position of the detection point, The voltage is expressed as y(t); b. Calculate the voltage difference between the first voltage and the initial value of the voltage, the voltage difference is expressed as Δy=|y(t)-y(0)| ; c. judging whether the voltage difference is between the first threshold and the second threshold; if the voltage difference is between the first threshold and the second threshold, then detecting the detection point again for a second time the second voltage, if the voltage difference between the second voltage and the initial value of the voltage is still between the first threshold and the second threshold, send a command to stop supplying power to the heating body to the execution circuit instruction.

Description

A SPA pool with leakage detection function and leakage detection control method

technical field

The present invention relates to the field of SPA pools, in particular to a control method for detecting electric leakage in a SPA pool and a corresponding control device. The SPA pool is preferably a sports and health care product.

Background technique

With the continuous development of science and technology and the continuous improvement of the quality of life, people pay more and more attention to their own health. However, due to the increasing pressure of work and life, people often choose many ways to reduce stress. SPA is a healthy way Leisure services that relieve stress and relax the skin are favored by more and more people. Through SPA, people can achieve auditory, taste, touch, smell, and visual relaxation, thereby relieving stress and making SPA customers feel relieved. Much more relaxed physically and mentally.

According to relevant information, SPA includes cold water bath, hot water bath, alternating cold and hot water bath, sea water bath, hot spring bath, and tap water bath. Each bath can relax, relieve tension, and tired muscles and nerves to a certain extent, and eliminate Toxins in the body can prevent and treat diseases. In addition, hydrotherapy with various aromatic essential oil massages will accelerate fat burning and have a slimming effect. SPA promotes the circulation of the human body by cooperating with various rare trace elements to achieve the effect of beautifying the body; resists pressure through hydrotherapy and relieves the body's own pressure; promotes perspiration through heat to achieve the purpose of slimming.

With the continuous development and extension of SPA technology, we often add some negative ions, ozone and other elements in SPA to increase the curative effect of SPA, but in the general SPA recuperation, the water in the SPA pool needs to be heated to maintain the comfort of SPA recuperation However, the heaters used in SPA are often installed below the water level of the SPA pool. Such treatment may cause electric leakage in the SPA pool and cause some safety hazards for people in the SPA pool.

Contents of the invention

In view of the technical defect that the SPA pool in the prior art does not have the function of real-time monitoring and detection of electric leakage, the purpose of the present invention is to provide a control method for SPA pool leakage detection, whether the heating body for heating the SPA pool is leaking or not To detect, including the following steps:

a. Detect the first voltage at the first time at the detection point position, the voltage is expressed as y(t);

b. Calculate the voltage difference between the first voltage and the initial voltage value, the voltage difference is expressed as Δy=|y(t)-y(0)|;

c. judging whether the voltage difference is between the first threshold and the second threshold;

d. If the voltage difference is between the first threshold and the second threshold, then detect the second voltage at the second time at the detection point again, if the second voltage is between the initial value of the voltage If the voltage difference is still between the first threshold and the second threshold, an instruction to stop supplying power to the heating body is issued to the execution circuit.

Preferably, the above-mentioned control method for detecting electric leakage of the SPA pool can also be used to detect other electrical 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 the execution circuit.

Preferably, the following steps are also included before step a:

The second voltage at the detection point is recorded and detected after the heating body is started and before it works, and the second voltage is used as the initial value of the voltage.

Preferably, the second voltage is detected 10 seconds before the heating body works.

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;

-5v; or

-5.1v.

Preferably, the second threshold is obtained by calculating the following formula: |first threshold-initial voltage value|/T, where T is the cumulative duration of the heating body from the start of operation to the current time, and the cumulative duration is Calculated in hours.

According to another aspect of the present invention, there is provided a SPA pool with leakage detection function, the SPA pool at least includes a heating body, and the heating body is used to heat the water contained in the SPA pool, which is characterized in that , the heating body is connected to a power supply, and the power supply provides electric energy to the heating body, and the SPA pool with leakage detection function also includes a leakage detection system, and the leakage detection system includes at least a detection unit and an execution unit, The detection unit is connected to a detection line, the other end of the detection line is connected to the shell of the heating body, the execution unit is used to control the power supply to supply electric energy to the heating body or to stop supplying electric energy, and the detection The 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 electric energy to the heating body.

Preferably, the other end of the detection line is connected to any one of the following components: the shell of the heating body; or the conductor part of the heating body.

Preferably, the other end of the detection line is connected to the heating body through an isolation element.

Preferably, the isolation element is any one of the following elements: a safety capacitor; a Hall element, wherein there are three detection lines; a transformer; or an optocoupler.

Preferably, the detection line is connected to the first pin of the detection unit.

Preferably, a protective impedance element is further connected between the detection line and the detection unit.

Preferably, the protective impedance element includes any one of the following components: a first capacitor; a series circuit of the first capacitor and the 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 to a detection circuit, and the detection circuit includes 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. A parallel circuit is formed, and the detection circuit is connected in parallel with the heating body through a second resistor.

Preferably, the second pin of the detection unit is connected to a detection circuit, the L_|N terminal of the detection circuit is connected to an eighth capacitor, and the other end of the eighth capacitor is connected in series with the ninth capacitor and the third resistor After connecting in parallel with one end of the fourth resistor, the cathode of the first diode is connected, the anode of the first diode is connected with the cathode of the second diode, and the anode of the second diode is connected with the third and second diodes. The negative electrode of the pole tube is connected, and the series circuit composed of the first diode, the second diode and the third diode is connected with one end of the sixteenth capacitor, one end of the fourteenth capacitor, and the seventh resistor respectively. One end is connected in parallel, one end of the tenth capacitor is connected to the eleventh capacitor, and the series circuit composed of the tenth capacitor and the eleventh capacitor and the series circuit composed of the twelfth capacitor, the thirteenth capacitor, the sixth resistor, and the fifth resistor The circuit is connected in parallel to 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, and the seventeenth capacitor. One end, one end of the fifteenth capacitor, one end of the eighth resistor, the cathode of the fourth diode is connected in the middle of the sixth resistor and the fifth resistor, and the cathode of the fifth diode and the anode are respectively connected to the anode of the fourth diode and the cathode of the sixth diode, and the series circuit composed of the fourth diode, the fifth diode and the sixth diode is respectively connected to the anode of the sixth diode. The other end of the seventeenth capacitor, the fifteenth capacitor, and the eighth resistor is connected in parallel.

Preferably, the execution unit includes at least one relay, and the relay is used to control the closing or opening of the switch between the power supply and the heating body according to the detection unit.

The control method for SPA pool leakage detection realizes the dynamic protection of leakage by quantifying the degree of leakage as the integral of leakage current, leakage voltage and their action time, and by weighted sliding average prediction method.

More specifically, the control method for SPA pool leakage detection is effective for real-time judgment and protection of dynamic leakage changes in various use environments and SPA pools with different insulation strengths, and meets the requirements of safety regulations. Specifically, the control method for SPA pool leakage detection can be applied to the field of dynamic protection of SPA pools with time-ladder characteristics, multiple use environments, and various dielectric strengths.

Description of drawings

Fig. 1 shows according to a specific embodiment of the present invention, the specific flow chart of detecting whether the heating body that heats the SPA pool is leaking electricity;

Fig. 2 shows according to a specific embodiment of the present invention, the structural relationship diagram between each module in described SPA pool;

Fig. 3 shows according to a specific embodiment of the present invention, the structural topology diagram of the leakage detection system in the SPA pool;

Figure 4 shows a partial circuit diagram of the leakage detection system in the SPA pool according to a specific embodiment of the present invention;

5 shows a schematic circuit diagram of the electric leakage detection system in the SPA pool according to another specific embodiment of the present invention; and

Fig. 6 shows a schematic circuit diagram of the leakage detection system in the SPA pool according to a specific embodiment of the present invention.

Icon Description

1. SPA pool

2. Heating body

21. Conductor 22. Insulator

23. Charged body

3. Power supply

4. Leakage detection system

41. Detection unit 42. Execution unit

5. Other control circuits

6. Water

7. Relay

8. Detection line

9. Hall element

detailed description

In order to better clearly express the technical solution of the present invention, the present invention will be further described below in conjunction with the accompanying drawings.

Fig. 1 shows a specific flow chart of detecting whether the heating body for heating the SPA water pool leaks electricity according to a specific embodiment of the present invention, specifically, what is shown in Fig. The detection control method, further, the detection of whether the heating body for heating the SPA pool is leaking is not limited to the control method, and the control method is only one shown for the specific implementation of the present invention A preferred example, specifically, includes the following steps:

First enter step S101, detect the first voltage at the first time at the detection point position, the voltage is expressed as y(t), those skilled in the art understand that the detection point refers to the detection position that can reflect whether the detection body is leaking, It is the optimal position obtained through technical research by those skilled in the art and a large number of tests. By detecting the detection point, the voltage at the position can be measured. Preferably, the optimal position is close to the detection circuit, and the The optimal position is marked as point A. The measurement of the voltage is obtained through the detection of related instrumentation equipment in the field, such as capacitors, sensors, etc., more specifically, the detection circuit will be described in detail in the specific embodiments of the present invention, and will not be repeated here .

The y(t) refers to the voltage detected at the detection point after the heating body of the SPA pool has been working for t, and further, in a preferred variation, the y(t) can also be It is the detection voltage after the heating body is started for _k seconds, timed from time tk, and then running for a time t. Those skilled in the art understand that the above-mentioned variation examples belong to the specific implementation mode of the detection voltage and do not affect the scope of the present invention. The technical solution will not be repeated here. ,

Those skilled in the art understand that the purpose of detecting the first voltage at the detection point at the first time is to monitor the real-time voltage of the heating body, and to calculate and analyze the leakage of the heating body based on the real-time voltage , so as to determine whether the heating body is leaking electricity, and further, make corresponding technical treatment on the heating body.

Preferably, those skilled in the art understand that before performing the step S101, the following processing should be done for the embodiment: record the first voltage of the detection point after the heating body is started and before working, and The first voltage is used as the initial value of the voltage. Preferably, the initial value of the voltage is represented by y(0), the initial value of the voltage y(0) refers to the voltage when the heating body is started but not yet working, and the voltage value y(0 ) can reflect the voltage status in the current state, and further technical processing is performed by comparing with the detected voltage in step S101. The technical processing will be described in detail in step S102 and will not be repeated here.

Those skilled in the art understand that, in a preferred variation, according to the specific process of detecting the initial value of the voltage in the above embodiment, the first voltage is preferably detected 10 seconds before the heating body works. Specifically, those skilled in the art understand that in order to effectively detect the first voltage and fully reflect the leakage situation, the time for detecting the first voltage in advance should not be too long or too short, and the time for detecting the first voltage in advance should not be too long or too short. Detecting the initial voltage in seconds is a preferred solution obtained from a large number of experiments and calculations by those skilled in the art. Further, in another preferred variation, the initial voltage may also be detected 5 seconds in advance. It does not affect the analysis and calculation of the leakage situation, so it will not be repeated here.

After step S101 is executed, proceed to step S102 to calculate the voltage difference between the first voltage and the initial voltage value, and the voltage difference is expressed as Δy=|y(t)-y(0)| , preferably, in the leakage detection system of the SPA pool, a calculation module is provided, and the calculation module is used to calculate the voltage difference between the first voltage and the initial value of the voltage, specifically, through the steps S101 obtains y(t), and before said step S101, obtains y(0), further, by executing the algorithm |y(t)-y(0)|, obtains Δy, and said Δy Refers to the amount of change in the voltage of the heating body after the operating time t. Those skilled in the art understand that the amount of change in the voltage can fully reflect whether there is leakage in the heating body and the severity of the leakage .

Then, enter step S103, and 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 through a large number of experiments by those skilled in the art. Preferably, the first threshold is a set value, specifically, the first threshold is between 0.1v and Between 5.1v.

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 Δy is located, further, the The leakage detection system adopts different solutions for different intervals, which affects the working plan of the entire leakage detection system under certain conditions. Further, the first threshold can also be selected as 0.25V, 0.28V, 0.35V, etc., but the first threshold is preferably between 0.2V and 0.5V. Preferably, those skilled in the art understand that the The selection of the first threshold can be manually configured or the value of the first threshold can be built into the built-in chip of the electric leakage detection system, which will not be repeated here.

Those skilled in the art understand that the second threshold is preferably calculated using the following formula: |first threshold-initial voltage value|/T, further, the T is the accumulated time from the start of the heating body to the current time Duration, the cumulative duration is calculated in units of hours. Furthermore, it is known from the formula that the first threshold value is constant, and the initial voltage value will not change after detection. Further, with the accumulation of time, the second threshold value will become smaller accordingly.

Further, those skilled in the art understand that the SPA pool leakage detection system preferably sets two thresholds, and correspondingly adopts different solutions for the voltage difference belonging to different threshold ranges, and quantifies the variation degree of leakage as The integral of leakage current and leakage voltage and its action time, through the method of weighted sliding average prediction, realizes the dynamic protection of leakage. It will be mentioned in the specific implementation manner of the present invention, and will not be repeated here.

After step S103 is executed, in a preferred variation, if the voltage difference is not between the first threshold and the second threshold, a command to stop supplying power to the heating body is sent directly to the execution circuit instruction. Preferably, assuming that the first threshold is U ₁ and the second threshold is U ₂ , when U2 > Δy > U1, it means that there may be electric leakage in the heating body, and the heating body needs to be Further detection is performed, and the detection method will be described in detail in step S104. I won't go into details here.

Preferably, if the voltage difference is not between the first threshold and the second threshold, that is, when Δy>U2 or U1>Δy, step S105 is executed, and the executive circuit is directly issued to stop heating to the Specifically, when △y>U2, the voltage change is very large. Those skilled in the art understand that the leakage is very serious, and a fault should be reported immediately, and the entire product should be locked so that it cannot continue Work, when U1>△y, can be divided into two situations for analysis, if the heating body is not working, the U1>△y, or the △y is equal to 0, it means that the △y is very small , it may be that the voltage is too low due to hardware faults such as disconnected wires or lack of related functions. Further, step S105 is executed; if the heating body is in normal operation, U1 > Δy, it means that the heating The body does not have the leakage.

Furthermore, those skilled in the art understand that if the said U2>Δy>U1, then the heating body needs to be tested again, specifically, the second voltage at the second time at the detection point is detected, if 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 heating body is issued to the execution circuit.

Those skilled in the art understand that the second voltage at the second time refers to the voltage value detected by the detection circuit again. Preferably, when the U2>Δy>U1, the heating should be turned off immediately The power supply of the body, and after waiting for several seconds, re-power the heating body, and record the initial value of the voltage 10 seconds before the power supply, the initial value of the voltage is different from y(0), further, according to the The second voltage calculates the voltage difference, and judges again the threshold interval where the voltage difference is located, and further, if the voltage difference is still between the first threshold and the second threshold, then It indicates that the heating body has electric leakage during operation, and sends an instruction to the execution circuit to stop supplying power to the heating body. If the voltage difference is smaller than the first threshold, it can be preliminarily judged that the heating element is working normally, but tracking and monitoring is still required; if the voltage difference is larger than the second threshold, the power supply will be stopped immediately.

Preferably, those skilled in the art understand that the voltage difference can also be converted into the resistance of the insulating layer through a large number of scientific calculations. Specifically, when the insulation resistance of the heating body drops below the set value, the detection circuit sends a signal to stop power supply. An instruction is sent to the execution circuit, thereby cutting off the power supply to the heating body, and realizing leakage protection.

Fig. 2 shows, according to a specific embodiment of the present invention, the structural relation diagram between each module in described SPA pool, what show in the figure is only the partial section view of described SPA pool, not complete SPA pool The system, for example, only shows part of the water and part of the outer wall of the pool in the figure. Further, the position of the modules shown is only a specific embodiment of the present invention, and there may be other forms of expression, which do not affect the technology of the present invention scheme, which will not be described here.

Further, Fig. 2 is to better illustrate the connection correspondence between the leakage detection system, the heating body and the SPA pool, specifically:

The heating body 2 is in contact with the water 6 in the SPA pool 1 for heating the water 6 in the pool 1 . The heating body is preferably wrapped with an insulating material and covered with a conductor on the surface.

Further, on the other hand, 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. Further, the power supply 3 can use an independent power supply or use the power provided by the SPA.

More specifically, the heating body 2 is connected to a leakage detection system 4, which can provide real-time leakage detection and judge whether to stop supplying power to the heating body 2 based on the real-time detection information.

Preferably, the electric leakage detection system 4 further includes a detection circuit and an execution circuit (not shown in the figure), which will be described in detail in the specific implementation and will not be repeated here.

Furthermore, the electric leakage detection system 4 is also connected to other control circuit systems 5 , which belong to the current prior art and will not be repeated here.

Fig. 3 shows a structural topology diagram of the leakage detection system in the SPA pool according to a specific embodiment of the present invention. As shown in the figure, the leakage detection system 4 includes at least 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, and the execution unit 42 is used to control the power supply 3 to provide electric energy to the heating body 2 or The supply of electric energy is stopped, and the detection unit 41 sends a signal to the execution unit 42 when detecting the electric leakage of the heating body 2 , so that the execution unit 42 controls the power supply 3 to stop supplying electric energy to the heating body 2 .

The detection unit 42 is used to detect whether the heating body 2 is leaking electricity. For the specific working process, refer to the specific implementation mode in FIG. The circuit 41 sends an instruction request to stop supplying power to the heating body 2 to the execution circuit 42, and the execution circuit 42 is used to control the power supply 3 to supply electric energy to the heating body 2 or to stop supplying electric energy. Through the above control The method can effectively monitor the electric leakage of the heating body and effectively prevent potential safety hazards caused by the electric leakage.

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, and the detection line 8 is used to detect the real-time voltage of the heating body 2, and through the The formula Δy=|y(t)-y(0)| is used to analyze and process the leakage of the heating body. More specifically, the other end of the detection line 8 is preferably connected to the shell of the heating body 2, and the shell is preferably covered with a conductor 23, and the specific description of the conductor 23 will be described in relation to the heating body in FIG. 2 described in detail, and will not be repeated here. In another preferred variation, the other end of the detection line 8 can also be connected to a specific part of the heating body 2 or to other parts of the leakage detection system 4 .

Those skilled in the art understand that, in another preferred variation, an isolating element is placed on the heating body, and the detection line 8 is preferably connected to the isolating element. Further, the isolating element is the following element Any of: Hall elements, transformers, optocouplers, capacitors. The Hall element refers to a magnetic sensor based on the Hall effect. Those skilled in the art understand that the Hall element is functionally the same as the transformer and the optocoupler. More specifically, as shown in FIG. 5 , the Hall element is connected to the heating body, and three detection lines are respectively connected to the Hall element and the detection unit. Those skilled in the art understand that through the conduction of the Hall element, the voltage or resistance or current information of the heating body can be obtained, so that it can be judged whether the heating body is charged; if charged, it indicates that the heating body is leaking, then 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 may refer to the following FIG. 4 to implement the working mechanism of the embodiment shown in FIG. 5 , which will not be repeated here.

Preferably, the detection line 8 is connected to the first pin of the detection unit 41 . There may be multiple pins in the detection unit 41 , the pins refer to the connection between the internal circuit and the 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 elements such as resistance, inductance, and capacitance that can hinder current in a circuit. Specifically, an impedance element is connected between the detection line 8 and the detection unit 41 to protect the impedance and limit the current. Further, the leakage detection system 4 detects the voltage of the point A through the circuit.

Preferably, as shown in the figure, in FIG. 3 there are two capacitors, respectively C1 and C2, arranged between the detection line 8 and the detection unit 41. The capacitors are used to protect impedance and limit current. The two capacitors are connected in series. Further, those skilled in the art understand that, in a preferred variation, a capacitor or three capacitors may be arranged between the detection line 8 and the detection unit 41. capacitance or more, which does not affect the technical solution of the present invention, and will not be repeated here.

In another preferred variation, if the shell of the heating body 2 is basically insulated, more specifically, if the point where the detection line 8 is connected to the heating body 2 is basically insulated, that is, it is insulated from the If the water 6 has insulation protection above basic insulation, the protection impedance may not be used between the detection line 8 and the detection unit 41 .

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 placed 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. The power supply of the heating body 2, further, the switch is controlled by the execution circuit 42. Preferably, the power supply 3 is connected to the execution circuit, and the relay is used to control the closing or opening of the switch between the power supply 3 and the heating body 2 according to the detection unit 41 .

As shown in Figure 3, the innermost layer of the heating body 2 is a charged body 23, which continuously releases heat energy after being electrified, and the middle layer is an insulating layer 22, and the insulating layer 22 is preferably a polyimide film. , more specifically, preferably the insulating layer is a 3.5-layer polyimide film. In a preferred variation, the insulating layer material can also be replaced by other insulating materials, and the insulating material should have a water-tight , no leakage, high temperature resistance and other characteristics. The outermost layer is a conductor 21, and the conductor 21 can conduct the leakage situation on the surface of the insulating layer to the conductor 21, and detect the leakage situation of the heating body 2. Those skilled in the art understand that the conductor 21 can also play a role in protecting the insulating layer 22 .

Preferably, the detection circuit 41 is also connected to other control circuits 5. In the other control circuits 5, a live wire and a neutral wire are preferably placed to form a potential difference with the detection point A to form a path.

FIG. 4 shows a partial circuit diagram of the leakage detection system in the SPA pool according to a specific embodiment of the present invention. Those skilled in the art understand that the second pin of the detection unit is connected to a detection circuit, so 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 communicates with the heating element through a second resistor In the figure, L refers to the live line, and the N refers to the neutral line. The C1, C2, C4, C5, C6, and C7 are all capacitors, and the functions of the capacitors are used to protect the impedance and limit the 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, and the R2 is used to limit the current Further, point A in Figure 4 refers to the detection point.

Further, with reference to the above-mentioned embodiments shown in Figures 1 to 4, those skilled in the art understand that in a preferred embodiment, the present invention provides a SPA product leakage detection method based on a weighted moving average prediction method. The degree is quantified as the integral of leakage current and leakage voltage and their action time, and the dynamic protection of leakage is realized through the method of weighted sliding average prediction. The present invention also provides a real-time judgment on the leakage of SPA products by using the absolute variable method based on actual usage scenarios and actual circuit component parameters. Furthermore, there is no need for the grounding unit to monitor the leakage and perform threshold protection for the system.

The experimental results show that the proposed method is effective for the real-time judgment of the leakage and the protection of the dynamic leakage change in various use environments and different insulation strength SPA pools. Dynamic protection field for SPA pools of various dielectric strengths.

In combination with the specific embodiments shown in Figures 1 to 4, the present invention provides a leakage detection system for SPA products:

(1) The system uses capacitors or sensors to collect leakage voltage and leakage current, as well as the dielectric strength value between the charged body and water.

(2) The system can use an independent power supply or a power supply provided by SPA products.

(3) The system uses capacitors, optocouplers, transformers or Hall elements to isolate signals.

(4) On the software, the degree of leakage is quantified as the integral of leakage current, leakage voltage and their action time, and the dynamic protection of leakage is realized through the method of weighted sliding average prediction.

(5) For all the set leakage power, the system will record the feedback value at this time before power-on, as a reference, to eliminate the interference of the environment and the difference in the parameters of the system components.

(6) The system uses a wire to directly connect or connect the measured body through a certain impedance.

Further, those skilled in the art understand that the detection principle of the leakage detection system is as follows:

Judging the insulation resistance of electrical appliances, when it drops and reaches the threshold, it will be protected.

Judging the voltage at point A, when it reaches the threshold, it will be protected.

Judging the current of point A to the analog ground, it will be protected after reaching the threshold.

Furthermore, the principle of the software detection is as follows:

First, monitor the value of the feedback signal at point A in real time, set it to y, the initial value of the system operation is y(0), and it will be y(t) after time t, y(t)=∫f(t), △y=|y( t)-y(0)|. Let threshold 1 be U1 (constant, experimental data), threshold 2 be U2, and the cumulative running time of the system be T.

Preferably, 10s before the PTC works, record the initial value y(0);

Furthermore, when the first detection judges U2>△y>U1, it is necessary to recalculate the value of △y in the detection, and when the second detection judges U2>△y>U1, the controller execution circuit will stop supplying Power on and report an error code.

Furthermore, when the detection judges that △y=0, it will immediately report a fault, and lock the entire product so that it cannot work anymore, otherwise continue to power on and monitor, and update y(0) and U2;

More specifically, when △y>U2, a fault is reported immediately, and the entire product is locked so that it cannot work anymore.

Wherein, U2 becomes smaller as the value of |U1-y(0)|/T becomes smaller.

Those skilled in the art understand that, as shown in Figure 3, the leakage detection principle of the leakage detection system is as follows:

Those skilled in the art understand that the leakage detection is composed of a detection circuit and an execution circuit, as shown in the right part of FIG. 3 , and the shell of the charged PTC-heater is connected with the detection circuit through a wire.

Preferably, the detection circuit detects the insulation resistance of the charged body in real time by connecting the wires. When the insulation resistance of the charged body (PTC heater) drops to a set value such as 10 megohms, the detection circuit outputs a control command, and cuts off the insulation resistance of the charged body through the execution circuit. Body (PTC heater) power supply, so as to achieve leakage protection.

Further, with reference to the above-mentioned embodiments shown in Figures 1 to 5, those skilled in the art understand that the leakage detection system includes a detection unit, the second pin of the detection unit is connected to a detection circuit, and the detection circuit can This is achieved through various embodiments. For example, FIG. 6 shows a schematic circuit diagram of the electric leakage detection system in the SPA pool according to a specific embodiment of the present invention, especially a schematic diagram of the detection circuit. Specifically, the L_|N end of the detection circuit is connected to the eighth capacitor, and 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 the fourth resistor, and then connected to the first two poles The cathode of the tube, 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, and the first diode , the second diode, and the series circuit composed of the third diode are respectively connected in parallel with one end of the sixteenth capacitor, one end of the fourteenth capacitor, and one end of the seventh resistor, and one end of the tenth capacitor is connected to the eleventh capacitor, And the series circuit composed of the tenth capacitor and the eleventh capacitor and the series circuit composed of the twelfth capacitor, the thirteenth capacitor, the sixth resistor, and the fifth resistor are connected in parallel to 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, the first One end of the eight resistors, the cathode of the fourth diode is connected in the middle of the sixth resistor and the fifth resistor, and the cathode and anode of the fifth diode are respectively connected to the anode and the anode of the fourth diode The cathode of the sixth diode, the series circuit composed of the fourth diode, the fifth diode, and the sixth diode are respectively connected with the seventeenth capacitor, the fifteenth capacitor, the The other end of the eighth resistor is connected in parallel.

Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present 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.