CN107911052A - Dish-washing machine and its control circuit - Google Patents

Abstract

The invention discloses a dishwasher and its control circuit. The control circuit includes: a washing pump DC motor used in the dishwasher; a transformer for step-down converting the input first alternating current to output the second alternating current; a rectifier bridge, The first input end of the rectifier bridge is connected to one end of the secondary winding of the transformer, the first output end of the rectifier bridge is connected to one end of the DC motor, and the second input end of the rectifier bridge is connected to the other end of the secondary winding of the transformer and passed through The second controllable switch is connected to the other end of the DC motor, the second output end of the rectifier bridge is connected to the other end of the DC motor through the first controllable switch, and the rectifier bridge is used to rectify and transform the second AC power to output DC power for DC Motor; control module, used to control the first controllable switch and the second controllable switch so that the DC motor runs at the first speed and the second speed respectively, so as to realize two-speed washing of the dishwasher, thereby reducing the speed of the dishwasher. noise, while increasing the loading space of the dishwasher.

Description

Dishwasher and its control circuit

technical field

The invention relates to the technical field of kitchen appliances, in particular to a control circuit of a dishwasher and a dishwasher.

Background technique

The washing pump of the dishwasher in the related art usually uses a single-phase single-speed AC motor. However, due to the low efficiency of the single-phase single-speed AC motor, it is larger in size, requires a larger installation space, requires more consumables, and costs more, and the speed of the single-phase single-speed AC motor cannot be adjusted, that is, it cannot be used for dishwashers. The flow and pressure are adjusted, resulting in high energy consumption and high noise of the dishwasher.

In order to reduce the noise of the dishwasher, related technologies have proposed a technical solution of adding a large amount of noise-reducing damping materials and sound-insulating materials to the dishwasher. However, the existing problem is that the cost of the dishwasher will be further increased.

In order to meet the user's demand for a large loading space while maintaining the overall installation shape, the related technology also proposes a technical solution for compressing the bottom chassis space of the dishwasher, but the existing problem is that the scope of application is narrow, Cannot be used in regular household dishwashers.

Contents of the invention

The present invention aims to solve one of the technical problems in the above-mentioned technologies at least to a certain extent. Therefore, the first object of the present invention is to provide a control circuit for a dishwasher, which can effectively reduce the noise of the dishwasher while increasing the loading space of the dishwasher.

A second object of the invention is to propose a dishwasher.

In order to achieve the above object, a control circuit of a dishwasher proposed in the embodiment of the first aspect of the present invention includes: a DC motor used for the washing pump of the dishwasher; a transformer used for performing step-down conversion on the input first alternating current to output a second alternating current; a rectifier bridge, the first input end of the rectifier bridge is connected to one end of the secondary winding of the transformer, and the second input end of the rectifier bridge is connected to The other end of the secondary winding of the transformer is connected, the first output end of the rectifier bridge is connected to one end of the DC motor, and the second output end of the rectifier bridge is connected to the DC motor through a first controllable switch. The other end of the motor, the second input end of the rectifier bridge is also connected to the other end of the DC motor through a second controllable switch, and the rectifier bridge is used to rectify and transform the second alternating current to output direct current supply The DC motor; a control module, the control module is used to control the first controllable switch and the second controllable switch so that the DC motor operates at a first speed and a second speed respectively, so as to Two-speed washing of the dishwasher is realized, wherein the first rotational speed is greater than the second rotational speed.

According to the control circuit of the dishwasher proposed in the embodiment of the present invention, the washing pump uses a DC motor, and the transformer steps down the input first alternating current to output the second alternating current. The first input end of the rectifier bridge and the secondary winding of the transformer connected to one end of the rectifier bridge, the second input end of the rectifier bridge is connected to the other end of the secondary winding of the transformer, the first output end of the rectifier bridge is connected to one end of the DC motor, and the second output end of the rectifier bridge is connected through the first controllable switch To the other end of the DC motor, the second input terminal of the rectifier bridge is also connected to the other end of the DC motor through a second controllable switch, the rectifier bridge rectifies and transforms the second AC power to output DC power to the DC electrode, and the control module controls the first The controllable switch and the second controllable switch are controlled to make the DC electrode run at the first rotation speed and the second rotation speed respectively, so as to realize the two-speed adjustment of the dishwasher. Therefore, the control circuit of the embodiment of the present invention utilizes the rectifier bridge and combines the first controllable switch and the second controllable switch to realize the high and low speed operation of the DC motor skillfully, so that the speed of the DC motor is adjusted without a series resistor, avoiding the Electric energy is wasted, and at the same time, it is beneficial to reduce the noise of the dishwasher, thereby reducing the amount of damping and sound insulation materials, and reducing the material cost of the dishwasher. Moreover, by adjusting the high and low speed of the DC motor, it is convenient to control the low-speed soaking and high-speed flushing of the dish dirt by the dishwasher, which is beneficial to control the amount of washing water in the dishwasher and reduce the water consumption and energy consumption of the dishwasher. , Improve the washing and drying functions of the dishwasher. In addition, the DC motor has high efficiency and small size, can reduce the input power of the motor, has an energy-saving effect, and can increase the internal loading space of the dishwasher, and is suitable for a dishwasher with a large loading capacity and a small chassis space.

In addition, the control circuit of the dishwasher according to the above-mentioned embodiments of the present invention may also have the following additional technical features:

According to an embodiment of the present invention, when the control module controls the first controllable switch to be closed and the second controllable switch to be opened, the rectifier bridge performs full-wave rectification and transformation on the second alternating current, The DC motor runs at the first rotational speed; when the control module controls the first controllable switch to be turned off and the second controllable switch to be turned on, the rectifier bridge conducts half of the second alternating current. wave rectification conversion, the DC motor runs at the second rotational speed.

According to an embodiment of the present invention, the first controllable switch and the second controllable switch may be relays.

According to an embodiment of the present invention, the rectifier bridge may include a first diode, a second diode, a third diode and a fourth diode, and the anode of the first diode is connected to the The cathode of the fourth diode is connected and has a first node, the cathode of the first diode is connected to the cathode of the second diode and has a second node, the anode of the third diode is connected to The anode of the fourth diode is connected and has a third node, the anode of the second diode is connected to the cathode of the third diode and has a fourth node, wherein the first node and The fourth node is respectively a first input terminal and a second input terminal of the rectifier bridge, and the second node and the third node are respectively a first output terminal and a second output terminal of the rectifier bridge.

According to an embodiment of the present invention, the control module may be further configured to control the first controllable switch and the second controllable switch according to the amount of water in the water cup of the dishwasher, so that the The DC motor runs alternately at the first rotational speed and the second rotational speed.

According to an embodiment of the present invention, the first alternating current is alternating current mains.

In order to achieve the above purpose, a dishwasher according to the embodiment of the second aspect of the present invention includes the control circuit of the dishwasher.

According to the dishwasher of the embodiment of the present invention, through the control circuit of the dishwasher, the high and low speed operation of the DC motor is cleverly realized by using the rectifier bridge combined with the first controllable switch and the second controllable switch, without the need for a series resistance to the DC motor The speed adjustment avoids the waste of electric energy, and at the same time helps to reduce the noise of the dishwasher, thereby reducing the amount of damping and sound insulation materials, and reducing the material cost of the dishwasher. Moreover, by adjusting the high and low speed of the DC motor, it is convenient to control the low-speed soaking and high-speed flushing of the dish dirt by the dishwasher, which is beneficial to control the amount of washing water in the dishwasher and reduce the water consumption and energy consumption of the dishwasher. , Improve the washing and drying functions of the dishwasher. In addition, the DC motor has high efficiency and small size, can reduce the input power of the motor, has an energy-saving effect, and can increase the internal loading space of the dishwasher, and is suitable for a dishwasher with a large loading capacity and a small chassis space.

According to an embodiment of the present invention, the dishwasher may be a drawer dishwasher, a cabinet dishwasher or a desktop dishwasher.

Description of drawings

1 is a schematic block diagram of a control circuit of a dishwasher according to an embodiment of the present invention;

Fig. 2 is a schematic circuit diagram of a control circuit of a dishwasher according to an embodiment of the present invention;

3 is an output waveform diagram of a rectifier bridge of a control circuit of a dishwasher according to an embodiment of the present invention;

Fig. 4 is a schematic diagram showing the relationship between the rotation speed and time of the control circuit of the dishwasher according to an embodiment of the present invention;

Fig. 5 is a schematic block diagram of a dishwasher according to an embodiment of the present invention.

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

First, a brief introduction is given to the working principle of a dishwasher using a single-phase single-speed AC motor.

The washing pump of the dishwasher in the related art uses a single-phase single-speed AC motor. Under the requirement of saving water, the amount of water inflow of each washing of the dishwasher is less, and the washing pump runs at high speed during single-speed washing, and the washing pump quickly drains the water in the dishwasher cup, but the water is sprayed into the dishwasher. It takes a certain amount of time to fall back on the dishes inside, resulting in fast pumping and slow water return, resulting in unstable load of the washing pump, or the washing pump is in a state of half-loaded water, and the motor vibration noise becomes louder. At the same time, the half-load state of the washing pump also reduces the water flushing capacity of the washing pump. Since the noise of the single-phase single-speed AC motor is relatively high, it is necessary to increase the damping material for noise reduction, which increases the cost of the dishwasher, and at the same time, the heat absorption effect of the damping material also increases the energy consumption of the dishwasher. In addition, the damping material is attached to the outside of the stainless steel liner, which prevents the stainless steel liner of the dishwasher from cooling down quickly during the drying phase of the dishwasher, so that the water vapor on the dishes cannot evaporate quickly and forms water droplets on the stainless steel liner , affecting the natural drying effect of dishes.

Based on this, embodiments of the present invention provide a control circuit for a dishwasher and a dishwasher with the control circuit.

The following describes the control circuit of the dishwasher and the dishwasher according to the embodiments of the present invention with reference to the accompanying drawings.

FIG. 1 is a schematic block diagram of a control circuit of a dishwasher according to an embodiment of the present invention. As shown in FIG. 1 , the control circuit of the dishwasher in the embodiment of the present invention includes: a DC motor M, a transformer T, a rectifier bridge 10 and a control module 20 .

Wherein, the DC motor M is used for the washing pump of the dishwasher; the transformer T is used for step-down converting the input first AC power u1 to output the second AC power u2, wherein the first AC power u1 may be AC mains power.

The first input end of the rectifier bridge 10 is connected with one end of the secondary winding of the transformer T, the second input end of the rectifier bridge 10 is connected with the other end of the secondary winding of the transformer T, and the first output end of the rectifier bridge 10 is connected with the DC motor One end of M is connected, the second output end of the rectifier bridge 10 is connected to the other end of the DC motor M through the first controllable switch K1, and the second input end of the rectifier bridge 10 is also connected to the DC motor M through the second controllable switch K2 At the other end, the rectifier bridge 10 is used to rectify and transform the second alternating current to output direct current to supply the direct current motor M; the control module 20 is used to control the first controllable switch K1 and the second controllable switch K2 so that the direct current motor M Operate at the first rotational speed and the second rotational speed respectively to realize two-speed washing of the dishwasher, wherein the first rotational speed is greater than the second rotational speed.

That is to say, after the dishwasher is powered on, the transformer T performs step-down conversion on the AC mains power and outputs the second AC power u2, the secondary winding of the transformer T inputs the second AC power u2 into the rectifier bridge 10, and the second AC power u2 is rectified The bridge 10 outputs direct current after rectification to supply power to the direct current motor M,

It should be noted that the speed of the DC motor M can be adjusted by adjusting the voltage across the DC motor M. Specifically, the control module 20 can change the effective voltage of the direct current output by the rectifier bridge 10 by controlling the first controllable switch K1 and the second controllable switch K2 to be turned on and off, thereby adjusting the rotational speed of the direct current motor M.

Therefore, the control circuit of the embodiment of the present invention utilizes the rectifier bridge and combines the first controllable switch and the second controllable switch to realize the high and low speed operation of the DC motor skillfully, so that the speed of the DC motor is adjusted without a series resistor, avoiding the Electric energy is wasted, and at the same time, it is beneficial to reduce the noise of the dishwasher, thereby reducing the amount of damping and sound insulation materials, and reducing the material cost of the dishwasher. Moreover, by adjusting the high and low speed of the DC motor, it is convenient to control the low-speed soaking and high-speed flushing of the dish dirt by the dishwasher, which is beneficial to control the amount of washing water in the dishwasher and reduce the water consumption and energy consumption of the dishwasher. , Improve the washing and drying functions of the dishwasher. In addition, the DC motor has high efficiency and small size, can reduce the input power of the motor, has an energy-saving effect, and can increase the internal loading space of the dishwasher, and is suitable for a dishwasher with a large loading capacity and a small chassis space.

According to an embodiment of the present invention, when the control module 20 controls the first controllable switch K1 to close and the second controllable switch K2 to open, the rectifier bridge 10 performs full-wave rectification and transformation on the second alternating current, and the DC motor M operates with the first speed operation; when the control module 20 controls the first controllable switch K1 to be turned off and the second controllable switch K2 to be closed, the rectifier bridge 10 performs half-wave rectification on the second alternating current, and the DC motor M runs at the second speed.

Wherein, the rectifier bridge 10 can perform full-wave rectification conversion and half-wave rectification conversion. As shown in FIG. The first direct current U1 is output, and the rectifier bridge 10 outputs the second direct current U2 during half-wave rectification. A direct current U1 or a second direct current U2, when the rectifier bridge 10 outputs the first direct current U1, the DC motor M runs at a first speed, that is, the DC motor M runs at a high speed, when the rectifier bridge 10 outputs the second direct current U2, the DC motor M runs at a The second rotation speed runs, that is, the DC motor M runs at a low speed.

Specifically, the first controllable switch K1 and the second controllable switch K2 are not closed at the same time. When the control module 20 controls the first controllable switch K1 to close, it controls the second controllable switch K2 to turn off. At this time, the rectifier bridge 10 performs full-wave rectification on the second alternating current u2, that is, outputs the first direct current U1, and the direct current motor M operates at a first rotational speed under the action of the first direct current U1. When the control module 20 controls the second controllable switch K2 to close, it controls the first controllable switch K1 to turn off. At this time, the rectifier bridge 10 performs half-wave rectification on the second AC power u2, that is, outputs the second DC power U2, and the DC motor The M runs at the second rotational speed under the action of the second direct current U2.

Specifically, the first controllable switch K1 and the second controllable switch K2 may be relays. More specifically, when the control module 20 energizes the first controllable switch K1 , the first controllable switch K1 is closed, and when the control module 20 energizes the second controllable switch K2 , the second controllable switch K2 is closed.

According to an embodiment of the present invention, as shown in FIG. 2 , the rectifier bridge 10 includes a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4, the first diode The anode of the tube D1 is connected to the cathode of the fourth diode D4 and has a first node J1, the cathode of the first diode D1 is connected to the cathode of the second diode D2 and has a second node J2, and the third diode The anode of the tube D3 is connected to the anode of the fourth diode D4 and has a third node J3, and the anode of the second diode D2 is connected to the cathode of the third diode D3 and has a fourth node J4, wherein the first The node J1 and the fourth node J4 are respectively the first input terminal and the second input terminal of the rectifier bridge 10 , and the second node J2 and the third node J3 are respectively the first output terminal and the second output terminal of the rectifier bridge.

That is to say, when the control module 20 controls the first controllable switch K1 to be turned on and the second controllable switch K2 to be turned off, the secondary winding of the transformer T will input the second alternating current u2 into the rectifier bridge 10, as shown in FIGS. 2 and 3 . It shows that when the second alternating current u2 is in the positive half wave, the first diode D1 and the third diode D3 are turned on, the second diode D2 and the fourth diode D4 are turned off, and the rectified first The second AC current u2 flows from one end of the DC motor M to the other end of the DC motor M. When the second AC current u2 is in the negative half-wave, the second diode D2 and the fourth diode D4 are turned on, and the first diode The tube D1 and the third diode D3 are cut off, and the rectified second alternating current u2 flows from one end of the DC motor M to the other end of the DC motor M, so that the rectifier bridge 10 closes the first controllable switch K1 and the second controllable switch Full-wave rectification is performed when K2 is disconnected, and the waveform of the second alternating current u2 after full-wave rectification is shown as U1 in Figure 3. The average value of the output voltage when the rectifier bridge 10 performs full-wave rectification can be U1(AV)=0.9u2 , the DC motor M is running at high voltage and high speed, where u2 is the effective value of the second alternating current u2.

When the control module 20 controls the second controllable switch K2 to turn on and the first controllable switch K1 to turn off, the secondary winding of the transformer T will input the second alternating current u2 into the rectifier bridge 10, when the second alternating current u2 is in the positive half wave , then the first diode D1 is turned on, the second diode D2, the third diode D3 and the fourth diode D4 are turned off, and the second alternating current u2 flows from one end of the DC motor M to the other end of the DC motor M At one end, when the second alternating current u2 is in the negative half-wave, the first diode D1, the second diode D2, the third diode D3 and the fourth diode D4 are all cut off, at this time, the fourth and second The pole tube D4 does not participate in the work, one end of the DC motor M is at the same potential as the other end of the DC motor M, and there is no voltage between one end of the DC motor M and the other end of the DC motor M, so that the rectifier bridge 10 is closed when the second controllable switch K2 and Half-wave rectification is performed when the first controllable switch K1 is turned off, and the waveform of the second alternating current u2 after half-wave rectification is shown as U2 in Figure 3. =0.45u2, the DC motor M is running at low voltage and low speed, where u2 is the effective value of the second alternating current u2.

According to an embodiment of the present invention, the control module 20 is also used to control the DC motor M to alternately run at the first rotational speed and the second rotational speed. Specifically, the control module 20 is also used to control the first controllable switch K1 and the second controllable switch K2 according to the amount of water in the water cup of the dishwasher, so that the DC motor M cycles alternately at the first rotational speed and the second rotational speed. run.

More specifically, the control module 20 detects the amount of water in the water cup of the dishwasher. If the water amount in the water cup of the dishwasher is lower than the preset water amount, the control module 20 controls the second controllable switch K2 to close, that is, controls the DC motor M Running at the second speed, if the water volume in the water cup of the dishwasher is higher than the preset water volume, the control module 20 controls the first controllable switch tube K1 to close, that is, controls the DC motor M to run at the first speed, so as to achieve The amount of water in the water cup of the bowl machine causes the DC motor M to alternately circulate at the first rotational speed and the second rotational speed.

That is to say, as shown in FIG. 4 , the DC motor M can alternately operate at high speed and low speed during operation. When the dishwasher is washing, the water flow is not strong at low speed, and the momentum is not strong, but the water can be sprayed on the dishes, causing the dirt on the dishes to be expanded by the water. pump discharge. Specifically, the control module 20 can adjust the operating speed of the DC motor M of the dishwasher by controlling the first controllable switch K1 and the second controllable switch K2. There is enough water for the high-speed washing of the washing pump. At this time, the DC motor M is controlled to run at a high speed, and the washing pump performs high-speed washing. The water in the water cup is quickly drained, and the return water in the dishwasher enters the dishwasher water cup. Due to the backwater and arrogance, There is not enough water in the water cup, then control the DC motor M to run at a low speed, the impact force of the water flow decreases, the washing pump sprays water on the dishes, soaks and expands the dirt on the dishes, the water in the dishwasher is concentrated back into the water cup, and the water in the cup is sufficient At this time, the DC motor M is again controlled to run at a high speed to realize high-speed water washing, and the high-low speed alternating cycles are carried out to complete the entire washing process of the dishwasher.

Therefore, no matter whether the DC motor M runs at high speed or low speed, the washing pump can run stably at full load. When the DC motor M runs at low speed, the running noise of the dishwasher is significantly reduced. When running at high speed, the noise is also reduced due to the stable operation of the motor.

To sum up, according to the control circuit of the dishwasher proposed in the embodiment of the present invention, the washing pump uses a DC motor, the transformer steps down the input first AC power to output the second AC power, and the first input terminal of the rectifier bridge is connected to the One end of the secondary winding of the transformer is connected, the second input end of the rectifying bridge is connected with the other end of the secondary winding of the transformer, the first output end of the rectifying bridge is connected with one end of the DC motor, and the second output end of the rectifying bridge passes through the second A controllable switch is connected to the other end of the DC motor, and the second input end of the rectifier bridge is also connected to the other end of the DC motor through a second controllable switch, and the rectifier bridge rectifies and transforms the second AC power to output DC power for the DC electrodes, The control module controls the first controllable switch and the second controllable switch to make the DC electrode run at the first rotation speed and the second rotation speed respectively, so as to realize the two-speed adjustment of the dishwasher. Therefore, the control circuit of the embodiment of the present invention utilizes the rectifier bridge and combines the first controllable switch and the second controllable switch to realize the high and low speed operation of the DC motor skillfully, so that the speed of the DC motor is adjusted without a series resistor, avoiding the Electric energy is wasted, and at the same time, it is beneficial to reduce the noise of the dishwasher, thereby reducing the amount of damping and sound insulation materials, and reducing the material cost of the dishwasher. Moreover, by adjusting the high and low speed of the DC motor, it is convenient to control the low-speed soaking and high-speed flushing of the dish dirt by the dishwasher, which is beneficial to control the amount of washing water in the dishwasher and reduce the water consumption and energy consumption of the dishwasher. , Improve the washing and drying functions of the dishwasher. In addition, the DC motor has high efficiency and small size, can reduce the input power of the motor, has an energy-saving effect, and can increase the internal loading space of the dishwasher, and is suitable for a dishwasher with a large loading capacity and a small chassis space. The embodiment of the present invention also provides a dishwasher.

Fig. 5 is a schematic block diagram of a dishwasher according to an embodiment of the present invention. As shown in FIG. 5 , a dishwasher 200 according to an embodiment of the present invention includes a dishwasher control circuit 100 .

According to an embodiment of the present invention, the dishwasher 200 is a drawer dishwasher, a cabinet dishwasher or a table dishwasher.

To sum up, according to the dishwasher of the embodiment of the present invention, the high and low speed operation of the DC motor is cleverly realized through the control circuit of the dishwasher by using the rectifier bridge and combining the first controllable switch and the second controllable switch, thus, There is no need for series resistance to adjust the speed of the DC motor, which avoids the waste of electric energy, and at the same time helps to reduce the noise of the dishwasher, thereby reducing the amount of damping and sound insulation materials, and reducing the material cost of the dishwasher. Moreover, by adjusting the high and low speed of the DC motor, it is convenient to control the low-speed soaking and high-speed flushing of the dish dirt by the dishwasher, which is beneficial to control the amount of washing water in the dishwasher and reduce the water consumption and energy consumption of the dishwasher. , Improve the washing and drying functions of the dishwasher. In addition, the DC motor has high efficiency and small size, can reduce the input power of the motor, has an energy-saving effect, and can increase the internal loading space of the dishwasher, and is suitable for a dishwasher with a large loading capacity and a small chassis space.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial" , "radial", "circumferential" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the referred device or Elements must have certain orientations, be constructed and operate in certain orientations, and therefore should not be construed as limitations on the invention.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components or the interaction relationship between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the present invention, unless otherwise clearly specified and limited, the first feature may be in direct contact with the first feature or the first and second feature may be in direct contact with the second feature through an intermediary. touch. Moreover, "above", "above" and "above" the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "beneath" and "beneath" the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or characteristic is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, those skilled in the art can make the above-mentioned The embodiments are subject to changes, modifications, substitutions and variations.

Claims (8)

1. A kind of 1. control circuit of dish-washing machine, it is characterised in that including：

   Direct current generator, the direct current generator are used for the washing pump of the dish-washing machine；

   Transformer, the transformer are used to carry out decompression transformation to the first alternating current of input to export the second alternating current；

   Rectifier bridge, the first input end of the rectifier bridge are connected with one end of the secondary windings of the transformer, the rectifier bridge The second input terminal be connected with the other end of the secondary windings of the transformer, the first output terminal of the rectifier bridge with it is described straight One end of galvanic electricity machine is connected, and the second output terminal of the rectifier bridge is connected to the another of the direct current generator by the first controllable switch One end, the second input terminal of the rectifier bridge is also connected to the other end of the direct current generator by the second controllable switch, described Rectifier bridge is used to carry out rectifying conversion to second alternating current to export the direct current supply direct current generator；

   Control module, the control module are used to be controlled such that first controllable switch and second controllable switch The direct current generator is run with the first rotating speed and the second rotating speed respectively, to realize that the dish-washing machine double speed washs, wherein, described the One rotating speed is more than second rotating speed.
2. 2. the control circuit of dish-washing machine according to claim 1, it is characterised in that wherein,

   The control module is when controlling the first controllable switch closure, second controllable switch to disconnect, the rectifier bridge Full-wave rectification conversion is carried out to second alternating current, the direct current generator is run with first rotating speed；

   The control module is when controlling first controllable switch to disconnect, second controllable switch closing, the rectifier bridge Halfwave rectifier conversion is carried out to second alternating current, the direct current generator is run with second rotating speed.
3. 3. the control circuit of dish-washing machine according to claim 1 or 2, it is characterised in that first controllable switch and institute It is relay to state the second controllable switch.
4. 4. the control circuit of dish-washing machine according to any one of claim 1-3, it is characterised in that the rectifier bridge includes First diode, the second diode, the 3rd diode and the 4th diode, the anode of first diode and the described 4th 2 The cathode of pole pipe is connected and has a first node, the cathode of first diode be connected with the cathode of second diode and With section point, the anode of the 3rd diode is connected with the anode of the 4th diode and has the 3rd node, an institute The anode for stating the second diode is connected with the cathode of the 3rd diode and has fourth node, wherein, the first node It is respectively the first input end and the second input terminal of the rectifier bridge with the fourth node, the section point and the described 3rd Node is respectively the first output terminal and the second output terminal of the rectifier bridge.
5. 5. the control circuit of dish-washing machine according to claim 1, it is characterised in that the control module is additionally operable to according to institute The water stated in the cup of dish-washing machine is controlled first controllable switch and second controllable switch, so that described straight Galvanic electricity machine is run with first rotating speed and the second rotating speed alternate cycles.
6. 6. the control circuit of dish-washing machine according to claim 1, it is characterised in that first alternating current is exchange city Electricity.
7. A kind of 7. dish-washing machine, it is characterised in that the control electricity including the dish-washing machine according to any one of claim 1-6 Road.
8. 8. dish-washing machine according to claim 7, it is characterised in that the dish-washing machine is drawer dishwasher, cabinet type washes the dishes Machine or table dish-washer.