Water electrolysis device, household appliance, and method for electrolyzing water thereof

Abstract

The application discloses an electrolysis water device, household electrical appliances and an electrolysis water method thereof. The device comprises: a power supply unit, the power supply unit comprising a first power supply end and a second power supply end, and outputting a positive voltage through the first power supply end and a negative voltage through the second power supply end; a first electrode and a second electrode arranged in a water tank; a first controllable switch and a second controllable switch, one end of the first controllable switch being connected with the first power supply end, the other end of the first controllable switch being connected with the first electrode, one end of the second controllable switch being connected with the second power supply end, the other end of the second controllable switch being connected with the first electrode, and the second electrode being connected to the ground, the first controllable switch and the second controllable switch being configured to be alternately turned on to control the first electrode and the second electrode to be commutated. Thus, the device controls the polarity of the electrode by alternately switching the positive and negative input voltages, achieves the purpose of automatic commutation, and can prevent the electrode sheet from being polarized, thereby prolonging the service life of the electrolysis sheet.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrical equipment, and in particular to an electrolytic water device, a household electrical appliance and an electrolytic water method of a household electrical appliance. BACKGROUND

[0002] At present, the method of generating hypochlorous acid for sterilization by electrolysis of water has been very common. Electrolytic water refers to placing a pair of electrodes in a solution containing sodium chloride, and passing direct current to the electrodes to electrolyze the sodium chloride solution to generate hypochlorous acid that can kill bacteria. The electrolysis process usually occurs inside the electrolytic water device. The existing hypochlorous acid generating device is expensive, requires a special IC (integrated circuit) to generate a constant current source, and uses a single polarity power supply, which is easy to cause electrode polarization and affect the service life of the electrode. SUMMARY

[0003] The present application aims to at least solve one of the technical problems in the related art. To this end, the first object of the present application is to provide an electrolytic water device that controls the polarity of the electrodes by alternately switching the positive and negative input voltages to achieve automatic commutation, thereby preventing electrode polarization and improving the service life of the electrolytic sheet.

[0004] The second object of the present application is to provide a household electrical appliance.

[0005] The third object of the present application is to provide an electrolytic water method of a household electrical appliance.

[0006] To achieve the above objects, the first aspect of the present application provides an electrolytic water device, comprising: a power supply unit, the power supply unit comprising a first power supply end and a second power supply end, and outputting a positive voltage through the first power supply end and a negative voltage through the second power supply end; a first electrode and a second electrode arranged in a water tank; a first controllable switch and a second controllable switch, one end of the first controllable switch being connected to the first power supply end, the other end of the first controllable switch being connected to the first electrode, one end of the second controllable switch being connected to the second power supply end, the other end of the second controllable switch being connected to the first electrode, the second electrode being connected to the ground, and the first controllable switch and the second controllable switch being configured to be alternately turned on to control the first electrode and the second electrode to commutate.

[0007] According to the electrolytic water device of the embodiment of the present application, the power supply unit comprises a first power supply end and a second power supply end, and outputs a positive voltage through the first power supply end and a negative voltage through the second power supply end, the first electrode and the second electrode are arranged in the water tank, the first controllable switch and the second controllable switch, one end of the first controllable switch is connected with the first power supply end, the other end of the first controllable switch is connected with the first electrode, one end of the second controllable switch is connected with the second power supply end, the other end of the second controllable switch is connected with the first electrode, the second electrode is connected to the ground, and the first controllable switch and the second controllable switch are configured to be alternately turned on to control the first electrode and the second electrode to be commutated. Thus, the device controls the polarity of the electrodes by alternately switching the positive and negative input voltages to achieve the purpose of automatic commutation, thereby preventing the electrode sheet from being polarized and improving the service life of the electrolytic sheet.

[0008] In addition, the electrolytic water device according to the above-mentioned embodiment of the present application can further have the following additional technical features:

[0009] According to one embodiment of the present application, the first controllable switch and the second controllable switch are both switching tubes.

[0010] According to one embodiment of the present application, the first controllable switch is a first MOS tube, and the second controllable switch is a second MOS tube, wherein the drain of the first MOS tube is connected with the first power supply end, the source of the first MOS tube is connected with the first electrode, the gate of the first MOS tube receives a first control signal, the source of the second MOS tube is connected with the second power supply end, the drain of the second MOS tube is connected with the first electrode, and the gate of the second MOS tube receives a second control signal.

[0011] According to one embodiment of the present application, the electrolytic water device further comprises a current detection unit configured to detect the current when the electrolytic water device is working to output a current sampling value, and a control unit connected with the current detection unit and configured to output the first control signal and the second control signal respectively to control the first MOS tube and the second MOS tube to be alternately turned on, and to adjust the duty cycle of the first control signal or the second control signal according to the current sampling value to make the electrolytic water device work in constant current.

[0012] According to one embodiment of the present application, the current detection unit comprises: a sampling resistor, one end of the sampling resistor being connected to the second electrode, and the other end of the sampling resistor being grounded; a first resistor, one end of the first resistor being connected to one end of the sampling resistor; a second resistor, one end of the second resistor being connected to the other end of the sampling resistor; an operational amplifier, the positive input end of the operational amplifier being connected to the other end of the first resistor, the negative input end of the operational amplifier being connected to the other end of the second resistor, and the output end of the operational amplifier being connected to the control unit; a first capacitor, the first capacitor being connected between the positive input end and the negative input end of the operational amplifier; a third resistor, one end of the third resistor being connected to a preset power supply, and the other end of the third resistor being connected to the positive input end of the operational amplifier; a fourth resistor, one end of the fourth resistor being grounded, and the other end of the fourth resistor being connected to the positive input end of the operational amplifier; and a feedback resistor, the feedback resistor being connected between the negative input end and the output end of the operational amplifier.

[0013] According to one embodiment of the present application, the amplitude of the positive voltage is equal to the amplitude of the negative voltage.

[0014] According to one embodiment of the present application, the power supply unit is a flyback switching power supply, and the secondary winding adopts a tap type design to output the positive voltage and the negative voltage.

[0015] According to one embodiment of the present application, the flyback switching power supply comprises: a transformer module, one end of the primary winding of the transformer module being connected to an input power supply; a switching module, one end of the switching module being connected to the other end of the primary winding, and the other end of the switching module being connected to a reference ground; a secondary output module, the secondary output module being connected to the secondary winding of the transformer module, and having a first power supply end and a second power supply end; a voltage feedback module, the voltage feedback module being connected to the first power supply end; and a master control module, the master control module being connected to the control end of the voltage feedback module and the switching module respectively, the master control module controlling the switching module to transform the input power supply by the transformer module, and outputting the positive voltage and the negative voltage by the secondary output module, and adjusting the duty cycle of the switching module according to the positive voltage output by the secondary output module fed back by the voltage feedback module, so as to stabilize the output of the positive voltage and the negative voltage by the secondary output module.

[0016] According to one embodiment of the present application, the secondary output module comprises: a first diode, an anode of the first diode being connected to one end of the secondary winding, a cathode of the first diode serving as a first power supply end; a second diode, an anode of the second diode being connected to the other end of the secondary winding, a cathode of the second diode serving as a second power supply end; a second capacitor and a first electrolytic capacitor, one end of the second capacitor being connected to the cathode of the first diode, the other end of the second capacitor being connected to a negative end of the first electrolytic capacitor and having a first node, a positive end of the first electrolytic capacitor being connected to the cathode of the second diode, the first node being connected to a center tap of the secondary winding and then grounded; a third capacitor and a second electrolytic capacitor, one end of the third capacitor being connected to a negative end of the second electrolytic capacitor and then connected to the first node, the other end of the third capacitor being connected to the cathode of the second diode, a positive end of the second electrolytic capacitor being connected to the cathode of the first diode.

[0017] To achieve the above object, the second aspect of the present application provides a household appliance, comprising: a water tank; and the electrolytic water device as described above, configured to electrolyze water in the water tank to generate hypochlorous acid.

[0018] The household appliance according to the embodiment of the present application, by the electrolytic water device as described above, electrolyzes water in the water tank to generate hypochlorous acid, thereby improving the efficiency of electrolysis and prolonging the service life of the household appliance.

[0019] To achieve the above object, the third aspect of the present application provides an electrolytic water method of a household appliance, comprising: when the electrolytic water function of the household appliance is turned on, controlling one of the first controllable switch and the second controllable switch to be turned on and the other to be turned off, so that the electrolytic water device works; obtaining the working time of the electrolytic water device; and controlling the first controllable switch and the second controllable switch to be turned on alternately according to the working time, so as to control the first electrode and the second electrode to be commutated.

[0020] The electrolytic water method of the household appliance according to the embodiment of the present application, first, when the electrolytic water function of the household appliance is turned on, controls one of the first controllable switch and the second controllable switch to be turned on and the other to be turned off, so that the electrolytic water device works, then obtains the working time of the electrolytic water device, and finally controls the first controllable switch and the second controllable switch to be turned on alternately according to the working time, so as to control the first electrode and the second electrode to be commutated. Thus, the method controls the polarity of the electrode by alternately switching the positive and negative input voltages, achieves the purpose of automatic commutation, and thereby can prevent the electrode from being polarized and improve the service life of the electrolytic sheet.

[0021] In addition, the electrolytic water method of the household appliance according to the above-mentioned embodiments of the present application can have the following additional technical features:

[0022] According to one embodiment of the present application, the method further comprises detecting the current of the electrolysis water device during operation of the electrolysis water device to output a current sample value; and adjusting the duty cycle of the first control signal or the second control signal according to the current sample value to make the electrolysis water device operate at a constant current.

[0023] Additional aspects and advantages of the present application will be described in the following description, will become apparent from the following description, or will be learned through practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 Block diagram of the electrolysis water device according to one embodiment of the present application;

[0025] Figure 2 Appearance of the home appliance according to one embodiment of the present application;

[0026] Figure 3 Schematic diagram of the electrolysis water device during electrolysis according to one embodiment of the present application;

[0027] Figure 4 Circuit schematic of the electrolysis water device according to one embodiment of the present application;

[0028] Figure 5 Schematic diagram of the current flow direction during positive voltage supply according to one embodiment of the present application;

[0029] Figure 6 Schematic diagram of the current flow direction during negative voltage supply according to one embodiment of the present application;

[0030] Figure 7 Block diagram of the electrolysis water device according to one embodiment of the present application;

[0031] Figure 8 Flowchart of the electrolysis water method of the home appliance according to one embodiment of the present application;

[0032] Figure 9 Flowchart of the electrolysis water method of the home appliance according to one embodiment of the present application. DETAILED DESCRIPTION

[0033] Embodiments of the present application are described in detail below with reference to the attached drawings, which show by way of example, embodiments in which the same or similar elements have the same or similar reference numbers and in which:

[0034] The electrolysis water device, the home appliance, and the electrolysis water method of the home appliance according to embodiments of the present application are described below with reference to the attached drawings.

[0035] In one embodiment of the present application, the household appliance can be a sterilizer, as shown in Figure 2 The sterilizer includes a water tank in which brine is stored, and an electrolytic water device for electrolyzing the brine in the water tank to generate hypochlorous acid for sterilization and disinfection, as shown in Figure 3

[0036] Figure 1 A block diagram of the electrolytic water device according to an embodiment of the present application.

[0037] As shown in Figure 1 The electrolytic water device can include a power supply unit 100, a first controllable switch 110, a second controllable switch 120, a first electrode 130 and a second electrode 140 disposed in a water tank 150.

[0038] The power supply unit 100 includes a first power supply terminal V1 and a second power supply terminal V2, and outputs a positive voltage through the first power supply terminal V1 and a negative voltage through the second power supply terminal V2. One end of the first controllable switch 110 is connected to the first power supply terminal V1, and the other end of the first controllable switch 110 is connected to the first electrode 130. One end of the second controllable switch 120 is connected to the second power supply terminal V2, and the other end of the second controllable switch 120 is connected to the first electrode 130. The second electrode 140 is connected to a ground GND. The first controllable switch 110 and the second controllable switch 120 are configured to be alternately turned on to control the first electrode 130 and the second electrode 140 to be commutated.

[0039] Specifically, the first electrode 130 and the second electrode 140 are placed in the water tank 150 for holding an electrolyte, and by passing a direct current through the first electrode 130 and the second electrode 140, the electrolyte can be electrolyzed to generate a desired substance. For example, the first electrode 130 and the second electrode 140 are placed in the water tank 150 holding a sodium chloride aqueous solution, and by passing a direct current through the first electrode 130 and the second electrode 140, the sodium chloride aqueous solution can be electrolyzed to generate hypochlorous acid for sterilization.

[0040] When the first controllable switch 110 is turned on, a positive voltage is supplied to the first electrode 130 and the second electrode 140 through the first controllable switch 110, and a current flows in a forward direction, and the first electrode 130 and the second electrode 140 start to electrolyze the electrolyte. When the first controllable switch 110 is turned off and the second controllable switch 120 is turned on, a negative voltage is supplied to the first electrode 130 and the second electrode 140 through the second controllable switch 120, and a current flows in a reverse direction, and the first electrode 130 and the second electrode 140 start to electrolyze the electrolyte.

[0041] ​Since the current through the electrode is direct current in the process of electrolyzing water, the electrode potential deviates from the equilibrium electrode potential, and polarization occurs. The polarization refers to the electrode potential deviating from the equilibrium value when the current flows through the electrode. This phenomenon is called polarization. When the current flows through the electrode, the phenomenon of the electrode potential deviating from the equilibrium electrode potential becomes the polarization of the electrode, which causes the service life of the electrolysis electrode to be shortened. Therefore, the polarity inversion can be used to increase the service life of the electrode. In the present application, the first controllable switch 110 and the second controllable switch 120 are alternately opened or closed to control the input of the positive and negative voltages, and then the first electrode 130 and the second electrode 140 are commutated. For example, when the first controllable switch 110 is opened and the second controllable switch 120 is closed, the current flows from the first electrode 130 to the second electrode 140 and finally to the ground GND, and the current flows in the forward direction. When the second controllable switch 120 is opened and the first controllable switch 110 is closed, the current flows from the ground GND to the second electrode 140 and then to the first electrode 130, and the current flows in the reverse direction. In this way, the polarity of the electrode is controlled by alternately switching the positive and negative input voltages to achieve the purpose of automatic commutation, without using a relay to control the polarity inversion, and the structure is simple, the cost is reduced, and the service life of the electrode is improved.

[0042] According to an embodiment of the present application, the first controllable switch 110 and the second controllable switch 120 can both be a switch tube. That is, the service life of the switch tube is much longer than that of the currently used relay switch, and the reliability is higher. In addition, compared with the existing double-pole double-throw relay used for controlling automatic commutation, the driving power consumption of the switch tube is smaller.

[0043] Further, according to an embodiment of the present application, as shown in Figure 4 the first controllable switch 110 is a first MOS tube, and the second controllable switch 120 is a second MOS tube. The drain D of the first MOS tube is connected to the first power supply end, the source S of the first MOS tube is connected to the first electrode 130, and the gate G of the first MOS tube receives a first control signal. The source S of the second MOS tube is connected to the second power supply end, the drain D of the second MOS tube is connected to the first electrode 130, and the gate G of the second MOS tube receives a second control signal.

[0044] Specifically, in the process of electrolyzing water, when the control signal received by the gate G of the first MOS tube is a high-level signal, the first MOS tube is in an on state, at this time, the first power supply end V1 of the power supply unit 100 outputs a positive voltage, the voltage of the first power supply end V1 is higher than the voltage of the second electrode 140 ground end, the current flows from the drain D and flows out from the source S, the current supplies power to the first electrode 130 and the second electrode 140 through the first MOS tube, and after the electrodes are powered on, the electrolytic water in the electrolytic water tank 150 is electrolyzed. When the control signal received by the gate G of the first MOS tube is a low-level signal, the first MOS tube is in an off state, at this time, the first power supply end V1 of the power supply unit 100 cannot supply power to the first electrode 130 and the second electrode 140 through the first controllable switch 110, and the electrolysis of water is stopped. When the control signal received by the gate G of the second MOS tube is a high-level signal, the second MOS tube is in an on state, at this time, the second power supply end V2 of the power supply unit 100 outputs a negative voltage, the voltage of the second electrode 140 ground end is higher than the voltage of the second power supply end V2, the current flows from the drain D and flows out from the source S, and the power supply unit 100 supplies power to the first electrode 130 and the second electrode 140 through the second MOS tube. After the electrodes are powered on, the electrolytic water in the electrolytic water tank 150 is electrolyzed. When the control signal received by the gate G of the second MOS tube is a low-level signal, the second MOS tube is in an off state, at this time, the second power supply end V2 of the power supply unit 100 cannot supply power to the first electrode 130 and the second electrode 140 through the second controllable switch 120, and the electrolysis of water is stopped.

[0045] According to one embodiment of the present application, as shown in Figure 4 The electrolytic water device further comprises a current detection unit 160 and a control unit (not specifically shown in the figure). The current detection unit 160 is configured to detect the current when the electrolytic water device is working to output a current sampling value; the control unit is connected with the current detection unit 160 and is configured to output a first control signal and a second control signal respectively to control the first MOS tube and the second MOS tube to be opened alternately, and adjust the duty cycle of the first control signal or the second control signal according to the current sampling value to make the electrolytic water device work with constant current.

[0046] Further, according to one embodiment of the present application, as shown in Figure 4As shown, the current detection unit 160 can include a sampling resistor R0, a first resistor R1, a second resistor R2, an operational amplifier OP, a first capacitor C1, a third resistor R3, a fourth resistor R4, and a feedback resistor R5. One end of the sampling resistor R0 is connected to the second electrode 140, and the other end of the sampling resistor R0 is grounded GND; one end of the first resistor R1 is connected to one end of the sampling resistor R0; one end of the second resistor R2 is connected to the other end of the sampling resistor R0; the positive input terminal of the operational amplifier OP is connected to the other end of the first resistor R1, the negative input terminal of the operational amplifier OP is connected to the other end of the second resistor R2, and the output terminal of the operational amplifier OP is connected to the control unit; the first capacitor C1 is connected between the positive input terminal and the negative input terminal of the operational amplifier OP; one end of the third resistor R3 is connected to a preset power supply, and the other end of the third resistor R3 is connected to the positive input terminal of the operational amplifier OP; one end of the fourth resistor R4 is grounded GND, and the other end of the fourth resistor R4 is connected to the positive input terminal of the operational amplifier OP; the feedback resistor R5 is connected between the negative input terminal and the output terminal of the operational amplifier OP.

[0047] Specifically, in order to ensure that the electrolytic water device works in constant current mode and improve the efficiency of electrolysis, the current detection unit 160 can be used to detect the current of the electrolytic water device during electrolysis, and output a current sampling value. The control unit adjusts the PWM duty cycle (i.e., the proportion of the on-time in one cycle) of the first MOS tube and the second MOS tube according to the size of the current sampling value, so that the electrolytic water device works in constant current mode. For example, the control unit outputs a first control signal PWM1 to control the first MOS tube to be turned on. For example, using pulse width modulation (PWM) technology, when the signal is at a high level, the first MOS tube is turned on, and the current flows through the first MOS tube. The first electrode 130 and the second electrode 140 have a forward current flowing through them, and the voltage between the first electrode 130 and the second electrode 140 is equal to the voltage of the power supply. When the signal is at a low level, the first MOS tube is turned off, and the current does not flow through the first MOS tube. The voltage between the first electrode 130 and the second electrode 140 is equal to the voltage of the power supply, and the current flows through the second MOS tube. Figure 5As shown, the current flows to the ground GND through the sampling resistor R0, and a voltage drop is generated at the sampling resistor R0. The resistor R1 and the capacitor C1 constitute a low-pass filter circuit connected to the positive input terminal of the operational amplifier OP. Since the voltage gain of the operational amplifier OP is very large, to ensure the stable operation of the circuit, when the operational amplifier OP is used, the output terminal thereof is usually connected to the inverting input terminal thereof to form a negative feedback configuration, and at this time, the positive voltage and the negative voltage of the operational amplifier OP are the same. The current flows through the operational amplifier OP to obtain a current sampling value I AVG, which can be calculated by the voltage difference between the positive input terminal and the negative input terminal divided by the feedback resistor R5. The amplification factor of the operational amplifier OP is determined by the resistance values of the feedback resistor R5 and the second resistor R2. One end of the third resistor R3 is connected to a preset power supply as a pull-up resistor, which can enhance the current when the current is insufficient. One end of the fourth resistor R4 is connected to the ground GND as a pull-down resistor, which can achieve the effect of shunting when the current is too large. The two together can avoid the "floating" of the input voltage and cause the circuit to be unstable. Thus, after obtaining the current sampling value, the control unit adjusts the PWM duty cycle according to the current value sampling value. For example, when the current sampling value is large, the conduction time of the first MOS tube can be reduced, and thus the current during the operation of the water electrolysis device can be reduced until the preset current value is reached. When the current sampling value is small, the conduction time of the first MOS tube can be increased, and thus the current during the operation of the water electrolysis device can be increased, thereby achieving the purpose of constant current regulation of the water electrolysis device. The preset current value can be determined according to the actual situation.

[0048] The control unit outputs a second control signal PWM2 to control the opening of the second MOS tube. For example, using the pulse width modulation (PWM) technology, when the signal is at a high level, the second MOS tube is opened, and the current flows from the ground GND through the sampling resistor R0, the first electrode 130 and the second electrode 140 in the reverse direction, as shown. Figure 6 A voltage drop is generated at the sampling resistor R0, and the current flows through the operational amplifier OP to obtain a current sampling value. The control unit adjusts the PWM duty cycle according to the current value sampling value. For example, when the voltage sampling value is large, the conduction time of the second MOS tube can be reduced, and thus the current during the operation of the water electrolysis device can be reduced until the preset current value is reached. When the voltage sampling value is small, the conduction time of the second MOS tube can be increased, and thus the current during the operation of the water electrolysis device can be increased, thereby achieving the purpose of constant current regulation of the water electrolysis device. The preset current value can be determined according to the actual situation.

[0049] In addition, in order to prevent the electrode sheet from being polarized and prolong its service life, the control unit outputs the first control signal and the second control signal to control the on-off of the first MOS tube and the second MOS tube, thereby alternately switching the positive and negative input voltages to control the polarity of the electrode sheet, so as to achieve the purpose of automatic commutation control. For example, when the current first MOS tube is open and the second MOS tube is closed, the working time T0 of the current electrolytic water device is obtained by the timer, and if the current working time T0 exceeds half an hour, the first MOS tube can be controlled to be closed and the second MOS tube can be controlled to be open. When the current second MOS tube is open and the first MOS tube is closed, the working time T0 of the current electrolytic water device is obtained by the timer, and if the current working time T0 exceeds half an hour, the second MOS tube can be controlled to be closed and the first MOS tube can be controlled to be open.

[0050] According to an embodiment of the present application, the amplitude of the positive voltage is equal to the amplitude of the negative voltage. That is, the voltage amplitude of the positive voltage output by the first power supply end is equal to the voltage amplitude of the negative voltage output by the second power supply end, so that when the first controllable switch 110 and the second controllable switch 120 are switched, the electrode potential can be ensured to be stable at a certain balance value, preventing the electrode sheet from being polarized and prolonging its service life.

[0051] According to an embodiment of the present application, the power supply unit 100 is a flyback switching power supply, and the secondary winding adopts a tap type design to output the positive voltage and the negative voltage.

[0052] Further, according to an embodiment of the present application, as shown in Figure 4 the flyback switching power supply comprises a transformer module 200, a switch module 300, a secondary output module 400, a voltage feedback module 500 and a main control module 600. One end of the primary winding T1 of the transformer module 200 is connected to an input power supply V; one end of the switch module 300 is connected to the other end of the primary winding T1, and the other end of the switch module is connected to a reference ground; the secondary output module 400 is connected to the secondary winding T2 of the transformer module 200 and has a first power supply end V1 and a second power supply end V2; the voltage feedback module 500 is connected to the first power supply end V1; the main control module 600 is connected to the control ends of the voltage feedback module 200 and the switch module 300, respectively, and the main control module 600 controls the switch module 300 to transform the input power supply by the transformer module 200 and output the positive voltage and the negative voltage by the secondary output module 400, and adjusts the duty cycle of the switch module 300 according to the positive voltage output by the secondary output module 400 fed back by the voltage feedback module 500, so as to stably output the positive voltage and the negative voltage by the secondary output module 400.

[0053] Specifically, as shown in Figure 4As shown, one end of the primary winding T1 of the transformer module 200 is connected to the input power supply, and the current flows through the primary winding T1 to the ground through the switching module 300. The resistance R, the capacitor C and the diode D form a spike absorption circuit, which can suppress the inrush voltage generated by the switching power supply to protect the switching module 300. When the main control module 600 controls the switching module 300 to be turned on, the transformer module 200 converts the electrical energy into magnetic energy in the primary winding T1. When the main control module 600 controls the switching module 300 to be turned off, the transformer module 200 converts the magnetic energy into electrical energy in the secondary winding T2. The supply voltage of the main control module 600 is provided by the secondary winding T3 of the primary coil. When the input power supply is input, the secondary winding T3 generates a voltage, which is limited by the resistance R10 and rectified by the diode D10 to enter the power supply pin VCC of the main control module 600, thereby providing power supply for the main control module 600. When the power supply is input into the transformer module 200, the positive power supply used for electrolysis of the water in the water tank 150 can be obtained through the first power supply end V1 of the secondary output module 400 in the secondary winding T2 of the transformer module 200, and the negative power supply used for electrolysis of the water in the water tank 150 can be obtained through the second power supply end V2 of the secondary output module 400. The voltage feedback module 500 is connected to the first power supply end V1. When the output voltage of the first power supply end V1 changes, the current flowing through the optocoupler IC2 changes, and the feedback electrical signal also changes. The change of the electrical signal is fed back to the main control module 600, which controls the switching module 300 to change the voltage at the output end of the secondary output module 400. For example, when the output voltage of the first power supply end V1 rises, the current flowing through the voltage stabilizing diode ZD1 increases, and the current flowing through the light emitting diode (1, 2) pin inside the optocoupler IC2 also increases. The voltage drop of the optocoupler IC2 (3, 4) pin decreases, and the voltage of the FB pin (feedback pin) of the main control module 600 decreases. When the voltage of the FB pin decreases, the main control module 600 controls the duty ratio of the switching module 300, so that the on-time of the switching module 300 becomes shorter and the off-time becomes longer, so that the voltage decreases, thereby achieving the purpose of stabilizing the output voltage. When the output voltage of the first power supply end V1 decreases, the current flowing through the voltage stabilizing diode ZD1 decreases, and the current flowing through the light emitting diode (1, 2) pin inside the optocoupler IC2 also decreases. The voltage drop of the optocoupler IC2 (3, 4) pin increases, and the voltage of the FB pin (feedback pin) of the main control module 600 increases. When the voltage of the FB pin decreases, the main control module 600 controls the duty ratio of the switching module 300, so that the on-time of the switching module 300 becomes longer and the off-time becomes shorter, so that the voltage increases, thereby achieving the purpose of stabilizing the output voltage. Thus, the electrolytic water can work in a constant current mode, so as to improve the efficiency of electrolysis.

[0054] Further, according to an embodiment of the present application, as Figure 4As shown, the secondary output module 400 includes: a first diode D1, a second diode D2, a second capacitor C2, a first electrolytic capacitor E1, a third capacitor C3 and a second electrolytic capacitor E2. Wherein, the anode of the first diode D1 is connected to one end of the secondary winding T2, and the cathode of the first diode D1 is used as the first power supply end V1; the anode of the second diode D2 is connected to the other end of the secondary winding T2, and the cathode of the second diode D2 is used as the second power supply end V2; one end of the second capacitor C2 is connected to the cathode of the first diode D1, and the other end of the second capacitor C2 is connected to the negative electrode end of the first electrolytic capacitor E1 and has a first node J1, the positive electrode end of the first electrolytic capacitor E1 is connected to the cathode of the second diode D2, and the first node J1 is connected to the intermediate tap of the secondary winding and then grounded GND; one end of the third capacitor C3 is connected to the negative electrode end of the second electrolytic capacitor E2 and then connected to the first node J1, the other end of the third capacitor C3 is connected to the cathode of the second diode D2, and the positive electrode end of the second electrolytic capacitor E2 is connected to the cathode of the first diode D1.

[0055] Specifically, when the power input transformer module 200 is connected, the alternating current can be converted into direct current through the first diode D1 and the second diode D2 of the secondary output module 400 in the secondary winding T2 of the transformer module 200, and the second capacitor C2 and the third capacitor C3 can convert the sawtooth wave after rectification into a smooth pulsating wave, which is close to direct current. By using the charge and discharge characteristics of the first electrolytic capacitor E1 and the second electrolytic capacitor E2, the pulsating direct current voltage after rectification can be converted into a relatively stable direct current voltage. Since the intermediate tap of the secondary winding T2 is grounded GND, the coil above the tap and the coil below the tap can output two groups of voltages with the same size and opposite phases, and the connection between the first diode D1 and the positive electrode end of the first electrolytic capacitor E1 forms the positive voltage input end of the first power supply end V1, and the connection between the second diode D2 and the third capacitor C3 forms the negative voltage input end of the second power supply end V2.

[0056] In summary, according to the electrolytic water device of the embodiment of the present application, the first controllable switch and the second controllable switch are configured to be alternately turned on to control the commutation of the first electrode and the second electrode, so that the electrode sheet polarization can be prevented, and the service life of the electrolytic sheet is improved.

[0057] Corresponding to the above-mentioned embodiment, the present application also proposes a household appliance.

[0058] As shown in the figure, Figure 7 The household appliance 1 of the embodiment of the present application can include a water tank 150 and an electrolytic water device 160. Wherein, the electrolytic water device 160 is configured to electrolyze the water in the water tank 150 to generate hypochlorous acid.

[0059] According to the household appliance provided by the embodiment of the present application, the water in the water tank can be electrolyzed by the water electrolysis device to generate hypochlorous acid, thereby improving the electrolysis efficiency and prolonging the service life of the household appliance.

[0060] According to the above embodiment, the present application further provides a water electrolysis method of a household appliance.

[0061] As shown in Figure 8 , the water electrolysis method of the household appliance provided by the embodiment of the present application comprises the following steps:

[0062] S1, when the household appliance starts the water electrolysis function, one of the first controllable switch and the second controllable switch is turned on and the other is turned off, so that the water electrolysis device works.

[0063] S2, the working time of the water electrolysis device is obtained.

[0064] S3, the first controllable switch and the second controllable switch are alternately turned on according to the working time to control the commutation of the first electrode and the second electrode.

[0065] According to one embodiment of the present application, during the working process of the water electrolysis device, the method further comprises: detecting the current when the water electrolysis device works to output a current sampling value; and adjusting the duty cycle of the first control signal or the second control signal according to the current sampling value to make the water electrolysis device work in constant current.

[0066] It should be noted that the details of the water electrolysis method of the household appliance provided by the embodiment of the present application are not disclosed, please refer to the details disclosed in the water electrolysis device of the embodiment of the present application, which will not be described here.

[0067] As a specific example, as shown in Figure 9 , the water electrolysis method of the above household appliance can comprise the following steps:

[0068] S101, the household appliance starts the water electrolysis function.

[0069] S102, the continuous working time T0 of the water electrolysis device is obtained.

[0070] S103, it is judged whether T0≥T_Set is true. If yes, step S104 is executed; if no, step S105 is executed. Wherein, T_Set is generally 0.5 hours.

[0071] S104, if the current first controllable switch is opened, it is controlled to be closed and the second controllable switch is opened to make the current flow reversely, otherwise, the first controllable switch is opened and the second controllable switch is closed to make the current flow forwardly.

[0072] S105, determine whether I OUT > I SET is true. If yes, execute step S106; if no, execute step S107. Wherein, I OUT is output current, and I SET is working current set for the water electrolysis device.

[0073] S106, reduce the current controllable switch PWM duty cycle until I OUT = I SET.

[0074] S107, determine whether I OUT < I SET is true. If yes, execute step S108; if no, execute step S109.

[0075] S108, increase the current controllable switch PWM duty cycle until I OUT = I SET.

[0076] S109, the water electrolysis device runs normally.

[0077] In summary, according to the water electrolysis method of the household appliance device of the embodiment of the present application, first, when the water electrolysis function of the household appliance device is turned on, one of the first controllable switch and the second controllable switch is turned on and the other is turned off, so that the water electrolysis device works, then the working time of the water electrolysis device is obtained, and finally the first controllable switch and the second controllable switch are alternately turned on according to the working time to control the commutation of the first electrode and the second electrode. Thus, the method controls the polarity of the electrode by alternately switching the positive and negative input voltages to achieve the purpose of automatic commutation, thereby preventing the polarization of the electrode sheet and improving the service life of the electrolysis sheet.

[0078] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a list of executable instructions for implementing logic functions, which can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus or device, such as a computer-based system, a system including a processor or other system that can fetch the instructions from the instruction execution system, apparatus or device and execute the instructions, or in conjunction with these instruction execution systems, apparatus or devices.

[0079] It should be understood that parts of the present application can be realized by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be realized by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if realized by hardware, and as in another embodiment, it can be realized by any one or a combination of the following technologies known in the art: discrete logic circuit with logic gate circuit for implementing logic functions on data signals, application specific integrated circuit with suitable combination logic gate circuit, programmable gate array (PGA), field programmable gate array (FPGA) and the like.

[0080] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0081] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified and limited.

[0082] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and other terms should be understood in a broad sense, for example, can be fixedly connected, can also be detachably connected, or integrated; can be mechanically connected, can also be electrically connected; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0083] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. An apparatus for electrolyzing water, characterized by comprising: include: The power supply unit includes a first power supply terminal and a second power supply terminal, and outputs a positive voltage through the first power supply terminal and a negative voltage through the second power supply terminal; The first and second electrodes are installed inside the water tank; A first controllable switch and a second controllable switch, one end of the first controllable switch is connected to the first power supply terminal, and the other end of the first controllable switch is connected to the first electrode; one end of the second controllable switch is connected to the second power supply terminal, and the other end of the second controllable switch is connected to the first electrode; the second electrode is connected to ground; the first controllable switch and the second controllable switch are configured to be turned on alternately to control the first electrode and the second electrode to switch directions. The first controllable switch is a first MOSFET, and the second controllable switch is a second MOSFET; A current detection unit is configured to detect the current when the water electrolysis device is operating, and to output a current sample value; The control unit is connected to the current detection unit and is configured to output a first control signal and a second control signal to control the first MOSFET and the second MOSFET to turn on alternately, and to adjust the duty cycle of the first control signal or the second control signal according to the current sampling value so that the water electrolysis device can operate at a constant current. The current detection unit includes: A sampling resistor, one end of which is connected to the second electrode, and the other end of which is grounded; A first resistor, one end of which is connected to one end of the sampling resistor; A second resistor, one end of which is connected to the other end of the sampling resistor; An operational amplifier, wherein the positive input terminal of the operational amplifier is connected to the other end of the first resistor, the negative input terminal of the operational amplifier is connected to the other end of the second resistor, and the output terminal of the operational amplifier is connected to the control unit; The first capacitor is connected between the positive input terminal and the negative input terminal of the operational amplifier. A third resistor, one end of which is connected to a preset power supply, and the other end of which is connected to the positive input terminal of the operational amplifier; A fourth resistor, one end of which is grounded and the other end of which is connected to the positive input terminal of the operational amplifier; A feedback resistor is connected between the negative input terminal and the output terminal of the operational amplifier.

2. The water electrolysis device according to claim 1, characterized in that The drain of the first MOSFET is connected to the first power supply terminal, the source of the first MOSFET is connected to the first electrode, and the gate of the first MOSFET receives the first control signal. The source of the second MOSFET is connected to the second power supply terminal, the drain of the second MOSFET is connected to the first electrode, and the gate of the second MOSFET receives the second control signal.

3. The water electrolysis device according to any one of claims 1-2, characterized in that, The magnitude of the positive voltage is equal to the magnitude of the negative voltage.

4. The water electrolysis device according to claim 3, characterized in that The power supply unit is a flyback switching power supply, and the secondary winding adopts a tapped design to output the positive voltage and the negative voltage.

5. The water electrolysis device according to claim 4, characterized in that The flyback switching power supply includes: A transformer module, wherein one end of the primary winding of the transformer module is connected to the input power supply; a switch module, one end of the switch module is connected with the other end of the primary winding, and the other end of the switch module is connected to a reference ground; a secondary output module, the secondary output module is connected with the secondary winding of the transformer module, and has the first power supply end and the second power supply end; a voltage feedback module, the voltage feedback module is connected with the first power supply end; a master control module, the master control module is connected with the voltage feedback module respectively, and is connected with the control end of the switch module, the master control module controls the switch module, so that the transformer module transforms the input power supply, and outputs the positive voltage and the negative voltage through the secondary output module, and adjusts the duty cycle of the switch module according to the positive voltage output by the secondary output module fed back by the voltage feedback module, so that the secondary output module stably outputs the positive voltage and the negative voltage.

6. The water electrolysis device according to claim 5, characterized in that the secondary output module comprises: a first diode, the anode of the first diode is connected with one end of the secondary winding, and the cathode of the first diode serves as the first power supply end; a second diode, the anode of the second diode is connected with the other end of the secondary winding, and the cathode of the second diode serves as the second power supply end; a second capacitor and a first electrolytic capacitor, one end of the second capacitor is connected with the cathode of the first diode, the other end of the second capacitor is connected with the negative electrode end of the first electrolytic capacitor and has a first node, the positive electrode end of the first electrolytic capacitor is connected with the cathode of the second diode, and the first node is connected with the intermediate tap of the secondary winding and then grounded; a third capacitor and a second electrolytic capacitor, one end of the third capacitor is connected with the negative electrode end of the second electrolytic capacitor and then connected to the first node, the other end of the third capacitor is connected with the cathode of the second diode, and the positive electrode end of the second electrolytic capacitor is connected with the cathode of the first diode.

7. An electric home appliance characterized by comprising: comprise: a water tank; an electrolytic water device according to any one of claims 1-6, configured to electrolyze water in the water tank to generate hypochlorous acid.

8. The electrolytic water method of the home appliance according to claim 7, characterized by, comprise: when the household appliance opens the electrolytic water function, one of the first controllable switch and the second controllable switch is turned on, and the other is turned off, so that the electrolytic water device works; obtain the working time of the electrolytic water device; control the first controllable switch and the second controllable switch to be turned on alternately according to the working time, so as to control the first electrode and the second electrode to be commutated.

9. The method of claim 8, wherein, In the working process of the electrolytic water device, the method further comprises: detecting the current when the electrolytic water device works to output a current sampling value; adjusting the duty cycle of the first control signal or the second control signal according to the current sampling value to make the electrolytic water device work in constant current.

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