Water pump control method and device and beverage preparation machine

Abstract

The invention discloses a water pump control method and device and a beverage preparation machine, a drive circuit of a water pump comprises a full-control switching device used for conducting on-off control on the water pump, and the method comprises the steps that a zero crossing point signal of alternating current supplying power to the water pump is obtained; according to the zero crossing point signal, the full-control switching device is controlled to be switched on and switched off alternately in the current half cycle of the alternating current, so that the full-control switching device is in the switched-off state in the target time period of the current half cycle, and the target time period is the time period when the voltage of the alternating current is larger than the target voltage value; and controlling the water pump to be in a closed state in the target time period based on the switching-on and switching-off alternately performed by the full-control switching device in the current half cycle, so that the switching-on time of the water pump avoids the wave crest time period and the wave trough time period of the alternating current voltage, the power frequency of the water pump is increased, and the technical problem that the noise of the water pump powered by alternating current is large is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of household appliance control, and particularly relates to a water pump control method, device and beverage preparation machine. Background Art

[0002] Pumps powered by alternating current have a problem of high noise in practical applications. The high-voltage electromagnetic water pumps in related technologies adopt a thyristor scheme. The thyristor can only be turned on and cannot be turned off within half of the mains cycle, and can only be turned off when reaching the next zero-crossing point. As a result, the high-voltage electromagnetic pump will pass through the peak voltage point of the alternating current during the turn-on process, causing pumps with high power to vibrate and generate relatively large noise, and mechanical noise reduction valves need to be added for noise reduction. Summary of the Invention

[0003] Embodiments of the present invention provide a water pump control method, device and beverage preparation machine, so as to solve the technical problem in related technologies that water pumps powered by alternating current generate high noise and mechanical noise reduction valves need to be added.

[0004] In a first aspect, embodiments of the present invention provide a water pump control method. The drive circuit of the water pump includes a fully controlled switch device for performing on-off control on the water pump. The method includes: obtaining a zero-crossing signal of the alternating current powering the water pump; controlling the fully controlled switch device to alternately conduct and turn off in the current half cycle of the alternating current according to the zero-crossing signal, so that the fully controlled switch device is in an off state in a target time period of the current half cycle, and the target time period is a time period when the voltage of the alternating current is greater than a target voltage value; based on the alternating conduction and turn-off of the fully controlled switch device in the current half cycle, controlling the water pump to be in an off state in the target time period.

[0005] In some embodiments, the controlling the fully controlled switch device to alternately conduct and turn off in the current half cycle of the alternating current according to the zero-crossing signal includes: when the zero-crossing signal is obtained, triggering the start of a conduction delay timing; when the conduction delay timing ends, controlling the fully controlled switch device to switch from an off state to a conduction state, and triggering the start of a first conduction duration timing; when the first conduction duration timing ends, controlling the fully controlled switch device to switch from the conduction state to the off state, and triggering the start of a turn-off duration timing for timing the target time period; when the turn-off duration timing ends, controlling the fully controlled switch device to switch from the off state to the conduction state, and triggering the start of a second conduction duration timing; when the second conduction duration timing ends, controlling the fully controlled switch device to switch from the conduction state to the off state.

[0006] In some embodiments, the method further includes: determining a timing duration of the turn-on delay timing according to a voltage change of the alternating current; determining timing durations of the first turn-on duration timing, the turn-off duration timing, and the second turn-on duration timing according to a noise change generated by the operation of the water pump and the timing duration of the turn-on delay timing.

[0007] In some embodiments, the determining the timing duration of the turn-on delay timing according to the voltage change of the alternating current includes: determining a first target duration required for the voltage of the alternating current to rise from a zero-crossing point to a minimum starting voltage of the water pump; determining the timing duration of the turn-on delay timing according to the first target duration.

[0008] In some embodiments, the determining the timing durations of the first turn-on duration timing, the turn-off duration timing, and the second turn-on duration timing according to the noise change generated by the operation of the water pump and the timing duration of the turn-on delay timing further includes: determining a target voltage value by testing the water pump, where the fully controlled switch device is in an off state during the target period and the noise value generated by the operation of the water pump is not higher than a preset noise threshold; determining a second target duration required for the voltage of the alternating current to rise from a zero-crossing point to the target voltage value within a half-cycle of the alternating current; determining the timing duration of the first turn-on duration timing according to the second target duration and the timing duration of the turn-on delay timing.

[0009] In some embodiments, the determining the timing durations of the first turn-on duration timing, the turn-off duration timing, and the second turn-on duration timing according to the noise change generated by the operation of the water pump and the timing duration of the turn-on delay timing further includes: after determining the target voltage value by testing the water pump, determining a duration during which the voltage of the alternating current is greater than the target voltage value within a half-cycle of the alternating current; determining the timing duration of the turn-off duration timing as a duration value not less than the duration.

[0010] In some embodiments, the determining the timing durations of the first turn-on duration timing, the turn-off duration timing, and the second turn-on duration timing according to the noise change generated by the operation of the water pump and the timing duration of the turn-on delay timing further includes: determining that the timing duration of the second turn-on duration timing is equal to the timing duration of the first turn-on duration timing, and the period occupied by the first turn-on duration timing in the current half-cycle and the period occupied by the second turn-on duration timing in the current half-cycle are symmetric with respect to the time point of the peak voltage of the alternating current.

[0011] In some embodiments, controlling the fully-controlled switch device to conduct and turn off alternately in the current half-cycle of the alternating current according to the zero-crossing signal includes: when the zero-crossing signal is obtained, triggering a square-wave pulse signal based on a fixed duty cycle to control the fully-controlled switch device to conduct periodically in the current half-cycle; wherein, the fixed duty cycle is determined according to a first target duration required for the voltage of the alternating current to rise from the zero-crossing point to the minimum starting voltage of the water pump, and a duration during which the noise value generated by the operation of the water pump is higher than a preset noise threshold.

[0012] In a second aspect, an embodiment of the present invention provides a water pump control device. The drive circuit of the water pump includes a fully-controlled switch device for performing switching control on the water pump. The control device includes: a signal acquisition unit for acquiring a zero-crossing signal of the alternating current powering the water pump; a conduction and cutoff control unit for controlling the fully-controlled switch device to conduct and turn off alternately in the current half-cycle of the alternating current, so that the fully-controlled switch device is in an off state during a target period in the current half-cycle, and the target period is a period when the voltage of the alternating current is greater than a target voltage value; and a water pump switch unit for controlling the water pump to be in an off state during the target period based on the conduction and cutoff of the fully-controlled switch device alternately in the current half-cycle.

[0013] In a third aspect, an embodiment of the present invention provides a beverage preparation machine, including a water pump and a drive circuit for controlling the water pump. The drive circuit includes a fully-controlled switch device for performing switching control on the water pump. The beverage preparation machine further includes a controller connected to the drive circuit. The controller includes: one or more processors and one or more memories. At least one program code is stored in the one or more memories, and the at least one program code is loaded and executed by the one or more processors to implement the steps of the method according to any one of the embodiments in the first aspect.

[0014] According to one or more technical solutions provided by the embodiments of the present invention, there are at least the following technical effects or advantages:

[0015] Since the drive circuit of the water pump in the embodiments of the present invention includes a fully controlled switch device for switching control of the water pump, by obtaining the zero-crossing signal of the alternating current powering the water pump and controlling the fully controlled switch device to conduct and turn off alternately in the current half-cycle of the alternating current, so that the fully controlled switch device is in the off state during the target period of the current half-cycle. And when the fully controlled switch device is in the off state during the target period of the current half-cycle, it can make the water pump in the off state during the target period. Since the target period is the period when the voltage of the alternating current is greater than the target voltage value, it can make the turn-on time of the water pump avoid the peak period and the trough period of the alternating current voltage, which can make the power of the water pump relatively stable, and then make the water pressure impact generated by the water pump pumping relatively stable, so as to reduce the noise generated by the vibration of the water pump. Therefore, the noise of the water pump is reduced by means of software control. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is the system architecture diagram of the water pump control system provided by the embodiments of the present invention;

[0018] Figure 2 It is the flowchart of the water pump control method provided by the embodiments of the present invention;

[0019] Figure 3 It is the schematic diagram of the conduction and turn-off of the fully controlled switch device within a half-cycle by adopting the water pump control method provided by the embodiments of the present invention;

[0020] Figure 4 It is the structural schematic diagram of the water pump control device provided by the embodiments of the present invention;

[0021] Figure 5 It is the structural schematic diagram of the controller of the beverage preparation machine provided by the embodiments of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] To make the purpose, technical solutions and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0023] An embodiment of the present invention provides a water pump control method, which is applied to a water pump control system powered by alternating current. The water pump control system can be applied to electrical appliances that need to pump water, such as beverage preparation machines like coffee machines, water purifiers, automatic water dispensers, washing machines, and so on. Figure 1 It is a system architecture diagram of the water pump control system provided by the embodiment of the present invention, as Figure 1 shown. The water pump control system may include: a water pump 110, a drive circuit 120 for driving the water pump 110 to work, and a controller 130 for controlling the drive circuit 120. The controller 130 may be an MCU (Microcontroller Unit) of a beverage preparation machine or a sub-controller for separately controlling the water pump 110. The drive circuit 120 includes a fully controlled switching device for performing on-off control on the water pump 110. Among them, the fully controlled switching device may be an IGBT switching device or a MOS switching device, and the controller 130 provides at least a control signal for controlling the fully controlled switching device.

[0024] Figure 2 It is a flowchart of the water pump control method provided by the embodiment of the present invention, as Figure 1 and Figure 2 shown. The water pump control method provided by the embodiment of the present invention may include the following steps S201 to S203.

[0025] S201: Obtain a zero-crossing signal of the alternating current powering the water pump 110.

[0026] As Figure 1 shown, in some embodiments, the water pump control system may further include a voltage detection circuit 140 connected to the controller 130. The voltage detection circuit 140 detects the zero-crossing of the alternating current powering the water pump 110 and feeds back the zero-crossing signal to the controller 130 each time the zero-crossing of the alternating current is detected.

[0027] S202: Control the fully controlled switching device to alternately conduct and turn off in the current half-cycle of the alternating current, so that the fully controlled switching device is in the off state during the target time period in the current half-cycle, and the target time period is the time period when the voltage of the alternating current is greater than the target voltage value.

[0028] It can be understood that when the controller 130 receives the zero-crossing signal fed back by the voltage detection circuit 140, step S202 is triggered to execute. It should be noted that the alternating current powering the water pump 110 includes a positive half-cycle and a negative half-cycle, and the alternating current may be 220V mains power. Figure 3 It is a schematic diagram of the on-off of the fully controlled switching device in a half-cycle when the water pump control method provided by the embodiment of the present invention is adopted, as Figure 3As shown, the current half-cycle refers to the nearest half-cycle after obtaining the zero-crossing signal: If the zero-crossing signal is obtained at the zero-crossing point where the alternating current changes from the negative half-cycle to the positive half-cycle, the current half-cycle is the positive half-cycle; if the zero-crossing signal is obtained at the zero-crossing point where the alternating current changes from the positive half-cycle to the negative half-cycle, the current half-cycle is the negative half-cycle.

[0029] In some embodiments, step S202 may include: determining, according to the obtained zero-crossing signal, a target period within the current half-cycle during which the voltage of the alternating current is greater than the target voltage value, and controlling the fully-controlled switch device to be in the off state during this target period; and during other periods outside this target period, controlling the fully-controlled switch device to conduct when the voltage of the alternating current reaches the minimum starting voltage of the water pump 110, where the target period during which the voltage of the alternating current is greater than the target voltage value is the target period during which the noise value generated by the operation of the water pump 110 is greater than the preset noise threshold.

[0030] In some embodiments, in order to control the fully-controlled switch device to be in the off state during the target period and to control the fully-controlled switch device to conduct when the voltage of the alternating current reaches the minimum starting voltage of the water pump 110 during other periods outside the target period, multiple timings of sequential startup can be used to control the fully-controlled switch device to alternately conduct and turn off, as well as the duration of each conduction and the duration of each turn-off, so that the turn-on of the water pump 110 can avoid the peak period and the trough period of the alternating current voltage. It can be understood that the following steps may be specifically included: when the zero-crossing signal is obtained, triggering the start of the conduction delay timing; when the conduction delay timing ends, controlling the fully-controlled switch device to switch from the off state to the on state and triggering the start of the first conduction duration timing; when the first conduction duration timing ends, controlling the fully-controlled switch device to switch from the on state to the off state and triggering the start of the turn-off duration timing for timing the target period; when the turn-off duration timing ends, controlling the fully-controlled switch device to switch from the off state to the on state and triggering the start of the second conduction duration timing; when the second conduction duration timing ends, controlling the fully-controlled switch device to switch from the on state to the off state.

[0031] It should be noted that, as Figure 3As shown, when the zero-crossing signal is obtained, the conduction delay timing, the first conduction duration timing, the turn-off duration timing, and the second conduction duration timing are triggered to start in sequence, which can divide the current half-cycle into five time periods: T1, T2, T3, T4, and T5. The state of the fully controlled switch device alternates between the on state and the off state during these five time periods. Among them, T1 is the time period corresponding to the conduction delay timing, T2 is the time period corresponding to the first conduction duration timing, T3 is the time period corresponding to the turn-off duration timing, T4 is the time period corresponding to the second conduction duration timing, and T5 is the remaining time period of the current half-cycle. When each corresponding timing ends, triggering a change in the state of the fully controlled switch device and starting the next timing can ensure that during the voltage change process of the alternating current in the current half-cycle, when the voltage rises to the minimum starting voltage of the water pump 110, the fully controlled switch device changes to the on state; when the voltage continues to rise to the target voltage value, the fully controlled switch device changes to the off state; when the voltage reaches the peak voltage and then drops to the target voltage, the fully controlled switch device changes to the on state again; when the voltage continues to drop to the minimum starting voltage of the water pump 110, the fully controlled switch device changes to the off state again. This enables, during the entire voltage change process after obtaining the zero-crossing signal, without the need to continuously determine whether the voltage of the alternating current reaches the minimum starting voltage of the water pump 110 and whether the voltage of the alternating current reaches the target voltage value. Simply by starting multiple timings in sequence, the on-off control of the fully controlled switch device can be achieved, reducing the control complexity.

[0032] It can be understood that the above-mentioned conduction delay timing, the first conduction duration timing, the turn-off duration timing, and the second conduction duration timing can be pre-written into the controller 130 after being obtained through testing the water pump 110 of this model and the alternating current supplying power to it. In some embodiments, the determination of each timing duration can be as follows: according to the voltage change of the alternating current supplying power to the water pump 110, determine the timing duration of the conduction delay timing; according to the noise change generated during the operation of the water pump 110 and the timing duration of the conduction delay timing, determine the timing durations of the first conduction duration timing, the turn-off duration timing, and the second conduction duration timing. More specifically, the timing duration of the conduction delay timing can be determined according to the voltage change of the alternating current within a half-cycle; the timing durations of the first conduction duration timing, the turn-off duration timing, and the second conduction duration timing can be determined according to the noise change generated during the operation of the water pump 110 within the half-cycle of the alternating current and the timing duration of the conduction delay timing.

[0033] In some embodiments, determining the timing duration of the conduction delay timing may include: determining a first target duration required for the voltage of the alternating current to rise from the zero crossing to the minimum starting voltage of the water pump 110; determining the timing duration of the conduction delay timing according to the first target duration. In some embodiments, the voltage change of the alternating current may be monitored, timing may start at the moment when the zero crossing of the alternating current is detected, and timing may stop when it is detected that the voltage has risen to the minimum starting voltage of the water pump 110, and the obtained timing duration is used as the first target duration. The minimum starting voltages of water pumps 110 with different powers may be different, and therefore, the first target durations of water pumps 110 with different powers may be different. After determining the first target duration, the first target duration may be directly used as the timing duration of the conduction delay timing, or the sum of the first target duration and a preset redundancy duration may be used as the timing duration of the conduction delay timing, that is: T ref1 = T1 + Δt, where T ref1 is the timing duration of the conduction delay timing, T1 is the first target duration, and Δt is the preset redundancy duration. For example: if the determined first target duration is 1 ms, then the timing duration of the conduction delay timing may be 1 ms + Δt.

[0034] In some embodiments, determining the timing duration of the first conduction duration timing may include: determining a target voltage value by testing the water pump 110, where the fully controlled switching device is in the off state during the target period, and the noise value generated by the operation of the water pump 110 is not higher than a preset noise threshold; within a half cycle of the alternating current, determining a second target duration required for the voltage value of the alternating current to rise from the zero crossing to the target voltage value; determining the timing duration of the first conduction duration timing according to the second target duration and the timing duration of the conduction delay timing. It can be understood that the noise levels generated by the operation of water pumps 110 with different powers are different, and therefore, the second target durations of water pumps 110 with different powers are different, and the preset noise threshold may be determined according to the actual requirements for noise control.

[0035] In some embodiments, the target voltage value can be determined through the following test process: candidate voltage values are sequentially selected from large to small within the voltage value range of alternating current, and among them, candidate voltage values can be selected from large to small at a preset interval. For example, taking the mains power as an example, candidate voltage values are sequentially selected from large to small within the range of 0 to 220V. For the candidate voltage value selected in the current selection, the fully controlled switch device is controlled to be in the off state during the period when the voltage of the alternating current is greater than the candidate voltage value selected in the current selection, and the maximum noise value generated by the operation of the water pump 110 is measured; if the maximum noise value is not greater than the preset noise threshold, the candidate voltage value selected in the current selection is taken as the target voltage value, otherwise, the next candidate voltage value is selected for retesting until the maximum noise value generated by the water pump 110 is not less than the preset noise threshold, and the target voltage value is obtained. The magnitude of the target voltage value depends on the noise magnitude generated by the operation of the water pump 110, and the greater the power of the water pump 110, the greater the noise generated by the pumping vibration, and the smaller the measured target voltage value.

[0036] In some embodiments, after determining the second target duration, the difference between the second target duration and the timing duration of the conduction delay timing can be directly used as the timing duration of the first conduction duration timing, that is: T ref2 = T2 - T ref1 . If the sum of the first target duration and the preset redundancy duration is used as the timing duration of the conduction delay timing: T ref1 = T1 + Δt, then the difference between the second target duration, the timing duration of the conduction delay timing, and the preset redundancy duration can be used as the timing duration of the first conduction duration timing, that is: T ref2 = T2 - T ref1 - Δt. Among them, T ref2 is the timing duration of the first conduction duration timing, T2 is the second target duration, T ref1 is the timing duration of the conduction delay timing, and Δt is the preset redundancy duration. For example: the second target duration is 4ms, and the timing duration of the conduction delay timing is 1ms, then the timing duration of the first conduction duration timing can be 4ms - 1ms - Δt.

[0037] Of course, in the specific implementation process, the timing duration of the first conduction duration timing can also be directly measured. For example, the conduction duration is sequentially reduced within the conduction duration range for testing, and the conduction duration when the maximum noise value generated by the water pump 110 is not less than the preset noise threshold is measured as the timing duration of the first conduction duration timing. It should be noted that the conduction duration range is the duration required for the voltage of the alternating current to rise from the minimum starting voltage to the peak voltage of 220V.

[0038] In some embodiments, determining the timing duration for the turn-off duration timing may include: after determining the target voltage value by testing the water pump 110, determining the duration during which the voltage of the alternating current is greater than the target voltage value within a half-cycle of the alternating current; determining the timing duration for the turn-off duration timing according to the duration, where the timing duration for the turn-off duration timing is a duration value not less than the duration, and this duration is the duration of the T3 period as shown in Figure 3 . Determining the duration during which the voltage of the alternating current is greater than the target voltage value within a half-cycle of the alternating current may be: multiplying the difference between the duration of the 1 / 2 half-cycle of the alternating current and the second target duration by 2 to obtain the duration during which the voltage of the alternating current is greater than the target voltage value.

[0039] In some embodiments, after determining the duration during which the voltage of the alternating current is greater than the target voltage value, the duration may be directly used as the timing duration for the turn-off duration timing, or the timing duration for the turn-off duration timing may be determined according to the duration and a preset redundancy duration. For example: T ref3 = T3 + 2×Δt, where T ref3 is the timing duration for the turn-off duration timing, T3 is the duration during which the voltage of the alternating current is greater than the target voltage value within a half-cycle, and Δt is the preset redundancy duration. By setting twice the redundancy duration for the timing duration of the turn-off duration timing, the fully controlled switching device can be turned off a little before the target period and then turned off a little after the target period, thereby improving the noise reduction effect on the water pump 110.

[0040] In some embodiments, determining the timing duration for the second conduction duration timing may include: determining the timing duration for the second conduction duration timing according to the timing duration for the first conduction duration timing. Among them, the timing duration for the second conduction duration timing (the duration of the T2 period as shown in Figure 3 ) is equal to the timing duration for the first conduction duration timing (the duration of the T4 period as shown in Figure 3 ), and the period occupied by the first conduction duration timing in the current half-cycle and the period occupied by the second conduction duration timing in the current half-cycle are symmetric with respect to the time point of the peak voltage of the alternating current (such as 220V of the commercial power), making the water pressure impact generated when the water pump 110 pumps water more stable, thereby further reducing the noise generated by the vibration of the water pump 110.

[0041] It should be understood that it is also possible to achieve that the fully controlled switch device is in the off state during the target period of the current half cycle after obtaining the zero-crossing signal without relying on multiple timings started in sequence, so as to bypass the peak voltage region of the alternating current when the water pump 110 is turned on. Therefore, in some other embodiments, step S202 may include: when the zero-crossing signal is obtained, triggering a square wave pulse signal based on a fixed duty cycle to control the fully controlled switch device to conduct periodically in the current half cycle; wherein, the fixed duty cycle is jointly determined according to the first target duration required for the voltage of the alternating current to rise from the zero-crossing point to the minimum starting voltage of the water pump 110 and the duration for which the noise value generated by the operation of the water pump 110 is higher than the preset noise threshold.

[0042] Exemplarily, if the half cycle of the alternating current is 10 ms, the first target duration required for the voltage of the alternating current to rise from the zero-crossing point to the minimum starting voltage of the water pump 110 is 1 ms, and the duration for which the noise value generated by the operation of the water pump 110 is higher than the preset noise threshold is 2 ms, then the duration required for the voltage of the alternating current to rise from the minimum starting voltage to the target voltage value is 3 ms. A square wave drive signal with a switching period of 4 ms and a fixed duty cycle of 50% can be used, so that the fully controlled switch device can be delayed by 2 ms after obtaining the zero-crossing signal and then conduct in the current half cycle, turn off after conducting for 2 ms, turn on again after turning off for 2 ms, and turn off again after turning on again for 2 ms, thereby achieving the alternation of conduction and turn-off of the fully controlled switch device in the current half cycle and being exactly in the off state during the target period.

[0043] S203: Based on the alternation of conduction and turn-off of the fully controlled switch device in the current half cycle, control the water pump 110 to be in the off state during the target period.

[0044] It should be noted that when the fully controlled switch device is in the on state, it will connect the alternating current and the water pump 110 to turn on the water pump 110, and when the fully controlled switch device is in the off state, it will disconnect the alternating current and the water pump 110 to turn off the water pump 110. Thus, through the alternation of conduction and turn-off of the fully controlled switch device in the current half cycle, the water pump 110 can be turned on at least twice in the current half cycle, and the turn-on time avoids the peak period (or trough period) of the alternating current voltage, wherein it is turned on at least once during the voltage rising stage of the current half cycle and at least once during the voltage falling stage. As Figure 3 shown, it is turned on at least once during the T2 period and at least once during the T4 period.

[0045] The current half - cycle of the water pump 110 is turned on at least twice. The turn - on of the water pump 110 bypasses the voltage peak of the alternating current, making the power of the water pump 110 relatively stable and the water pressure impact generated during water pumping relatively stable, thereby reducing the noise generated by the vibration of the water pump 110. Further, although the turn - on time of the water pump 110 bypasses the peak and trough periods of the alternating - current voltage, which reduces the power of the water pump 100, the increase in the number of turn - ons does not affect the water flow rate.

[0046] To facilitate the understanding of the above - mentioned one or more embodiments provided by the present invention, the following takes the alternating current powering the water pump 110 as 220V mains electricity, and the half - cycle of the mains electricity as 10ms as an example, and combines Figure 1 and Figure 3 as shown for illustration:

[0047] As Figure 3 shown, for the conduction delay timing corresponding to the T1 period, the timing duration is 1ms; for the first conduction duration timing corresponding to the T2 period, the timing duration is 3ms; for the turn - off duration timing corresponding to the T3 period, the timing duration is 2ms; for the second conduction duration timing corresponding to the T4 period, the timing duration is 3ms; for the remaining duration timing corresponding to the T5 period, the timing duration is 1ms. The control process of the water pump 110 needs to execute the following steps 1 - 7:

[0048] Step 1: The voltage detection circuit 140 detects the zero - crossing of the mains electricity and feeds back a zero - crossing signal to the controller 130 when detecting the zero - crossing of the mains electricity.

[0049] Step 2: The controller 130 receives the zero - crossing signal and triggers the start of the timer to count for 1ms during the T1 period.

[0050] Step 3: When the timer counts to 1ms, the controller 130 controls the fully - controlled switch device to conduct, thereby turning on the water pump 110. At the same time, the timer is cleared and the timer is restarted to count for 3ms during the T2 period.

[0051] Step 4: When the timer counts to 3ms, the controller 130 controls the fully - controlled switch device to turn off, so that the water pump 110 can be turned off after being turned on for 3ms. At the same time, the timer is cleared and the timer is restarted to count for 2ms during the T3 period.

[0052] Step 5: When the timer counts to 2ms, the controller 130 controls the fully - controlled switch device to conduct, so that the water pump 110 can be started after being turned off for 2ms. After clearing the timer, the timer is restarted to count for 3ms during the T4 period.

[0053] Step 6: When the timer counts up to 3 ms, the controller 130 controls the fully-controlled switching device to turn off, so that the water pump 110 can be turned off after being turned on for 3 ms. After clearing the timer, the timer is restarted to count for 1 ms during the T5 period.

[0054] Step 7: When the timer counts up to 1 ms, one complete control cycle of the positive half-cycle ends, and the process returns to Step 1 to enter the next control cycle for the control of the negative half-cycle.

[0055] Based on the same inventive concept, an embodiment of the present invention provides a water pump control device, as Figure 1 shown. The drive circuit 120 of the water pump 110 includes a fully-controlled switching device for performing switching control on the water pump 110. Figure 4 is a schematic structural diagram of the water pump control device provided by the embodiment of the present invention. As Figure 4 shown, the water pump control device includes: a signal acquisition unit 401 for acquiring the zero-crossing signal of the alternating current powering the water pump 110; a turn-on / off control unit 402 for controlling the fully-controlled switching device to alternately turn on and off during the current half-cycle of the alternating current according to the zero-crossing signal, so that the fully-controlled switching device is in the off state during the target period of the current half-cycle, and the target period is the period when the voltage of the alternating current is greater than the target voltage value; a water pump 110 switching unit 403 for controlling the water pump 110 to be in the off state during the target period based on the alternating on and off of the fully-controlled switching device during the current half-cycle.

[0056] In some embodiments, the turn-on / off control unit 402 can be used to: trigger the start of the conduction delay timing when the zero-crossing signal is acquired; when the conduction delay timing ends, control the fully-controlled switching device to switch from the off state to the on state and trigger the start of the first conduction duration timing; when the first conduction duration timing ends, control the fully-controlled switching device to switch from the on state to the off state and trigger the start of the off duration timing for timing the target period; when the off duration timing ends, control the fully-controlled switching device to switch from the off state to the on state and trigger the start of the second conduction duration timing; when the second conduction duration timing ends, control the fully-controlled switching device to switch from the on state to the off state.

[0057] In some embodiments, the water pump 110 control device further includes: a first duration determination unit for determining the timing duration of the conduction delay timing according to the voltage change of the alternating current; a second duration determination unit for determining the timing durations of the first conduction duration timing, the off duration timing, and the second conduction duration timing according to the noise change generated by the operation of the water pump 110 and the timing duration of the conduction delay timing.

[0058] In some embodiments, the first duration determination unit may be configured to: determine a first target duration required for the voltage of the alternating current to rise from the zero crossing point to the minimum start-up voltage of the water pump 110; and determine the timing duration of the conduction delay timing according to the first target duration.

[0059] In some embodiments, the second duration determination unit may be configured to: determine a target voltage value by testing the water pump 110, where the fully controlled switch device is in the off state during the target period and the noise value generated by the operation of the water pump 110 is not higher than a preset noise threshold; within a half cycle of the alternating current, determine a second target duration required for the voltage of the alternating current to rise from the zero crossing point to the target voltage value; and determine the timing duration of the first conduction duration timing according to the second target duration and the timing duration of the conduction delay timing.

[0060] In some embodiments, the second duration determination unit may further be configured to: after determining the target voltage value by testing the water pump 110, determine the duration during which the voltage of the alternating current is greater than the target voltage value within a half cycle of the alternating current; and determine that the timing duration of the turn-off duration timing is a duration value not less than the duration.

[0061] In some embodiments, the second duration determination unit may be configured to: determine that the timing duration of the second conduction duration timing is equal to the timing duration of the first conduction duration timing, and the period occupied by the first conduction duration timing in the current half cycle is symmetric with respect to the time point of the peak voltage of the alternating current as the period occupied by the second conduction duration timing in the current half cycle.

[0062] In some embodiments, the second duration determination unit may be configured to: when a zero crossing signal is obtained, trigger a square wave pulse signal based on a fixed duty cycle to control the fully controlled switch device to conduct periodically in the current half cycle; where the fixed duty cycle is determined according to the first target duration required for the voltage of the alternating current to rise from the zero crossing point to the minimum start-up voltage of the water pump 110 and the duration during which the noise value generated by the operation of the water pump 110 is higher than the preset noise threshold.

[0063] Based on the same inventive concept, an embodiment of the present invention provides a beverage preparation machine, as Figure 1 shown, the beverage preparation machine includes a water pump 110 and a drive circuit 120 for controlling the water pump 110, where the drive circuit 120 includes a fully controlled switch device for performing switch control on the water pump 110. Figure 5 is a schematic structural diagram of a controller of the beverage preparation machine provided by an embodiment of the present invention, as Figure 5As shown, the beverage preparation machine further includes a controller 130 connected to the drive circuit 120. The controller 130 includes one or more processors 1302 and one or more memories 1304. At least one program code is stored in the one or more memories 1304, and the at least one program code is loaded and executed by the one or more processors 1302 to implement the steps of the water pump control method according to any embodiment of the first aspect.

[0064] Among them, in Figure 5 , the bus architecture (represented by bus 1300), bus 1300 may include any number of interconnected buses and bridges. Bus 1300 links together various circuits including one or more processors represented by processor 1302 and memories represented by memory 1304. Bus 1300 may also link together various other circuits such as peripheral devices, voltage regulators, and power management circuits, etc., which are well known in the art. Therefore, they will not be further described herein. Bus interface 1305 provides an interface between bus 1300 and receiver 1301 and transmitter 1303. Receiver 1301 and transmitter 1303 may be the same element, i.e., a transceiver, providing a unit for communicating with various other devices over a transmission medium. Processor 1302 is responsible for managing bus 1300 and general processing, while memory 1304 may be used to store data used by processor 1302 when performing operations.

[0065] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, then the functions may be stored as one or more instructions or code on a computer-readable medium or transmitted via a computer-readable medium. Other examples and implementations are within the scope and spirit of the present invention and the appended claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hardwiring, or any combination of these. In addition, each functional unit may be integrated in a processing unit, or each unit may exist physically alone, or two or more units may be integrated in one unit.

[0066] In several embodiments provided in the present application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are merely illustrative. For example, the division of the units can be a logical function division. In actual implementation, there can be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection to each other can be through some interfaces. The indirect coupling or communication connection of units or modules can be in an electrical or other form.

[0067] The units described as separate components may or may not be physically separated. The components serving as control devices may or may not be physical units, that is, they can be located in one place or distributed to multiple units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0068] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present invention. The foregoing storage medium includes: various media such as USB flash drives, read-only memories (ROMs), random access memories (RAMs), mobile hard disks, magnetic disks, or optical discs that can store program codes.

[0069] The above are only the embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the scope of the claims of the present invention.

Claims

1. A water pump control method, characterized in that, The drive circuit of the water pump includes a fully controlled switch device for switching control of the water pump, and the method includes: Obtaining a zero-crossing signal of the alternating current powering the water pump; Controlling the fully controlled switch device to alternately conduct and turn off in the current half-cycle of the alternating current according to the zero-crossing signal, so that the fully controlled switch device is in an off state during a target period in the current half-cycle, and the target period is a period when the voltage of the alternating current is greater than a target voltage value; Based on the alternating conduction and turning off of the fully controlled switch device in the current half-cycle, controlling the water pump to be in an off state during the target period.

2. The method according to claim 1, characterized in that, The controlling the fully controlled switch device to alternately conduct and turn off in the current half-cycle of the alternating current according to the zero-crossing signal includes: When the zero-crossing signal is obtained, triggering the start of a conduction delay timing; When the conduction delay timing ends, controlling the fully controlled switch device to switch from an off state to a conduction state, and triggering the start of a first conduction duration timing; When the first conduction duration timing ends, controlling the fully controlled switch device to switch from the conduction state to the off state, and triggering the start of a turn-off duration timing for timing the target period; When the turn-off duration timing ends, controlling the fully controlled switch device to switch from the off state to the conduction state, and triggering the start of a second conduction duration timing; When the second conduction duration timing ends, controlling the fully controlled switch device to switch from the conduction state to the off state.

3. The method according to claim 2, characterized in that, It further includes: Determining the timing duration of the conduction delay timing according to the voltage change of the alternating current; Determining the timing durations of the first conduction duration timing, the turn-off duration timing, and the second conduction duration timing according to the noise change generated by the operation of the water pump and the timing duration of the conduction delay timing.

4. The method according to claim 3, characterized in that, The determining the timing duration of the conduction delay timing according to the voltage change of the alternating current includes: Determining a first target duration required for the voltage of the alternating current to rise from the zero-crossing point to the minimum starting voltage of the water pump; Determining the timing duration of the conduction delay timing according to the first target duration.

5. The method according to claim 4, characterized in that, The determining the timing durations of the first conduction duration timing, the turn-off duration timing, and the second conduction duration timing according to the noise change generated by the operation of the water pump and the timing duration of the conduction delay timing further includes: Determining the target voltage value by testing the water pump, wherein the fully controlled switch device is in an off state during the target period, so that the noise value generated by the operation of the water pump is not higher than a preset noise threshold; Determining a second target duration required for the voltage of the alternating current to rise from the zero-crossing point to the target voltage value within a half-cycle of the alternating current; Determining the timing duration of the first conduction duration timing according to the second target duration and the timing duration of the conduction delay timing.

6. The method according to claim 5, characterized in that, The determining the timing durations of the first conduction duration timing, the turn-off duration timing, and the second conduction duration timing according to the noise change generated by the operation of the water pump and the timing duration of the conduction delay timing further includes: After determining the target voltage value by testing the water pump, determine the duration during which the voltage of the alternating current is greater than the target voltage value within a half-cycle of the alternating current; Determine that the timing duration of the turn-off duration timing is a duration value not less than the duration.

7. The method according to claim 3, characterized in that, The method of determining the timing durations of the first conduction duration timing, the turn-off duration timing, and the second conduction duration timing according to the noise change generated by the operation of the water pump and the conduction delay timing further includes: Determine that the timing duration of the second conduction duration timing is equal to the timing duration of the first conduction duration timing, and the period occupied by the first conduction duration timing in the current half-cycle is symmetric with respect to the time point of the peak voltage of the alternating current as the period occupied by the second conduction duration timing in the current half-cycle.

8. The method according to claim 1, characterized in that, The method of controlling the fully-controlled switch device to alternately conduct and turn off in the current half-cycle of the alternating current according to the zero-crossing signal includes: When the zero-crossing signal is obtained, trigger a square-wave pulse signal based on a fixed duty cycle to control the fully-controlled switch device to conduct periodically in the current half-cycle; Wherein, the fixed duty cycle is determined according to the first target duration required for the voltage of the alternating current to rise from the zero-crossing point to the minimum starting voltage of the water pump and the duration during which the noise value generated by the operation of the water pump is higher than the preset noise threshold.

9. A water pump control device, characterized in that, The drive circuit of the water pump includes a fully-controlled switch device for performing switching control on the water pump, and the control device includes: A signal acquisition unit for acquiring a zero-crossing signal of the alternating current supplying power to the water pump; A turn-on / off control unit for controlling the fully-controlled switch device to alternately conduct and turn off in the current half-cycle of the alternating current according to the zero-crossing signal, so that the fully-controlled switch device is in the off state during the target period in the current half-cycle, and the target period is the period during which the voltage of the alternating current is greater than the target voltage value; A water pump switch unit for controlling the water pump to be in the off state during the target period based on the alternating conduction and turn-off of the fully-controlled switch device in the current half-cycle.

10. A beverage preparation machine, characterized in that, It includes a water pump and a drive circuit for controlling the water pump, wherein the drive circuit includes a fully-controlled switch device for performing switching control on the water pump; The beverage preparation machine further includes a controller connected to the drive circuit, and the controller includes: one or more processors and one or more memories, and at least one program code is stored in the one or more memories, and the at least one program code is loaded and executed by the one or more processors to implement the steps of the method according to any one of claims 1-8.

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