Low-power-consumption standby control circuit and method and dish-washing machine thereof

Abstract

The invention discloses a low-power-consumption standby control circuit, a low-power-consumption standby control method and a dish-washing machine thereof, and relates to the technical field of household appliances. A main control chip; the power supply control unit is respectively connected with the main control chip and the switching power supply, and the switching power supply supplies power to the main control chip through the power supply control unit; when the machine is in a standby state, the power supply control unit receives a power-off signal of the main control chip and turns off a power supply of the main control chip, so that the main control chip is completely powered off; and when the main control chip is completely powered off, the single wake-up unit can trigger the power supply control unit, so that the main control chip is powered on again. The main control chip is actively powered off, so that a post-stage circuit controlled by the main control chip is completely powered off, and the standby power consumption of the whole machine is reduced. And under the condition that the main control chip and a post-stage circuit thereof are completely powered off, if the machine has a safety failure or is operated by a user, the corresponding wake-up circuit can independently trigger the power supply control unit, so that the main control chip is electrified again.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and in particular to a low-power standby control circuit, method and dishwasher thereof. Background Art

[0002] In household appliances, standby power consumption refers to the power consumed by the device when the main function is not turned on. This power consumption mainly comes from the power circuit, control circuit, and some chips or modules that require continuous power supply. Since these circuits and chips need to remain in working state to achieve functions such as fast startup, remote control, and scheduled tasks, they will consume a certain amount of power even in standby mode.

[0003] As the world pays more and more attention to energy efficiency, many countries and regions have formulated strict energy efficiency standards and regulations, requiring that the power consumption of home appliances in standby mode must be controlled within a certain range. Therefore, reducing standby power consumption has become an important consideration in the design of home appliances.

[0004] At present, the following methods are used to reduce standby power consumption:

[0005] 1. Change the power supply position of the zero-crossing circuit: By adjusting the zero-crossing detection point in the power supply circuit, the current leakage during standby can be reduced, thereby reducing the standby power consumption. However, this method may affect the stability and reliability of the circuit, and may be difficult to implement for some complex power supply designs.

[0006] 2. Full-pole power-off: In standby mode, all unnecessary power supplies are cut off, leaving only the most basic control circuit power supply. Although this method can significantly reduce standby power consumption, there may be safety hazards of electrical failure (for example, dishwasher leakage); in addition, full-pole power-off is limited by the design of the entire machine, for example, it is not applicable to the design of touch buttons.

[0007] 3. Adjust the parameters of the switching power supply circuit: By optimizing the design of the switching power supply, its conversion efficiency can be improved and the power consumption during standby can be reduced. However, this may require the use of higher-cost components or more complex control algorithms, thereby increasing the cost and technical difficulty of the product.

[0008] It can be seen that the existing methods of reducing standby power consumption are either limited by the overall machine design and cannot be implemented, or require sacrificing circuit performance and cost to achieve. Summary of the invention

[0009] The technical problem to be solved by the present invention is how to prevent the machine from losing control when in low-power standby mode.

[0010] In a first aspect of the present invention, in order to solve the above technical problems, the present invention provides a low-power standby control circuit, which is applied to household appliances, and the circuit comprises:

[0011] Switching power supply;

[0012] A main control chip, which is connected to a motor drive power supply control unit and a load control unit;

[0013] a power control unit, which is connected to the main control chip and the switching power supply respectively, and the switching power supply supplies power to the main control chip through the power control unit; when the machine is in standby mode, the power control unit receives a power-off signal from the main control chip and turns off the power supply of the main control chip, so that the main control chip, the motor drive power supply control unit and the load control unit are completely powered off; and

[0014] A wake-up unit, wherein the output end of the wake-up unit is connected to the input end of the power control unit; the output end of the wake-up unit is connected to the input end of the power control unit; the wake-up unit can trigger the power control unit so that the main control chip is powered on again.

[0015] Further, the power control unit includes a transistor Q257, a transistor Q254, a transistor Q253 and a PMOS transistor Q252, wherein:

[0016] The source of the PMOS tube Q252 is connected to the collector of the transistor Q253; the gate of the PMOS tube Q252 is connected to the collector of the transistor Q254;

[0017] The base of the transistor Q253 is connected to the collector of the transistor Q254; the emitter of the transistor Q253 is connected to the emitter of the transistor Q254 and is grounded;

[0018] The base of the transistor Q254 is connected to the collector of the transistor Q257;

[0019] The base of the transistor Q257 is connected to the transistor Q257; the emitter of the transistor Q257 is grounded.

[0020] Further, the awakening unit includes one or more of a first awakening circuit, a second awakening circuit, a third awakening circuit and a fourth awakening circuit.

[0021] Further, the output ends of the first wake-up circuit, the second wake-up circuit, the third wake-up circuit and the fourth wake-up circuit are all connected to the power control unit; wherein:

[0022] The input end of the first wake-up circuit is connected to the water leakage protector;

[0023] The input end of the second wake-up circuit is connected to the flow meter;

[0024] The input end of the third wake-up circuit is connected to the display panel button;

[0025] An input end of the fourth wake-up circuit is connected to a machine door lock.

[0026] Further, the first wake-up circuit includes a transistor Q407 and a transistor Q408, wherein:

[0027] The base of the transistor Q407 is connected to the water leakage protector; the emitter of the transistor Q407 is grounded;

[0028] The collector of the transistor Q407 is connected to the base of the transistor Q408;

[0029] The collector of the transistor Q408 is connected to the power control unit.

[0030] Furthermore, the second wake-up circuit includes a transistor Q405 and a capacitor C415, wherein:

[0031] The base of the transistor Q405 is connected to the flow meter through the capacitor C415; the collector of the transistor Q405 is connected to the power control unit.

[0032] Further, the third wake-up circuit includes a transistor Q258 and a resistor R293, wherein:

[0033] The base of the transistor Q258 is electrically connected to the display panel key via the resistor R293 connected in series, and the resistor R293 is connected in parallel with the resistor 292 and the voltage-stabilizing diode D253 connected in series; the collector of the transistor Q258 is connected to the power control unit.

[0034] Further, the fourth wake-up circuit includes a transistor Q259 and a transistor Q260, wherein:

[0035] The base of the transistor Q259 is electrically connected to the machine door lock through the resistor R294; the collector of the transistor Q259 is connected to the base of the transistor Q260; and the collector of the transistor Q260 is connected to the power control unit.

[0036] A second aspect of the present invention provides a low power standby control method, which is applied to the low power standby control circuit.

[0037] A third aspect of the present invention provides a dishwasher, comprising the low-power standby control circuit.

[0038] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0039] On the one hand, when the machine is in standby mode, the present invention actively cuts off the power supply through the main control chip, so that the subsequent circuits controlled by the main control chip are completely powered off, thereby reducing the standby power consumption of the entire machine.

[0040] On the other hand, when the main control chip and its subsequent circuits are completely powered off, the wake-up circuit corresponding to the fault or user operation can trigger the power control unit individually, so that the main control chip is powered on and awakened again, allowing the machine to take corresponding actions. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0042] Figure 1 A circuit principle block diagram disclosed in an embodiment of the present invention;

[0043] Figure 2 A circuit diagram disclosed in an embodiment of the present invention.

[0044] In the figure:

[0045] 00, main control chip; 01, motor drive power supply control unit;

[0046] 10. Power control unit; 11. Switching power supply;

[0047] 20. wake-up unit; 21. first wake-up circuit; 22. second wake-up circuit; 23. third wake-up circuit; 24. fourth wake-up circuit;

[0048] 30. Load control unit. DETAILED DESCRIPTION

[0049] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] The first aspect of the present invention is to provide a low-power standby control circuit for use in household appliances. This embodiment takes a dishwasher as an example, and achieves complete power cutoff of the main control chip and the subsequent circuit without changing the parameters of the switching power supply circuit, without being limited by the overall machine design, and without sacrificing circuit performance and cost, thereby effectively reducing standby power consumption; at the same time, through a variety of wake-up methods, the safety risk of loss of control when the machine fails in the sleep state is avoided, and the user's operation can be responded to in a timely manner.

[0051] See also Figure 1-2 The circuit mainly includes a switching power supply 11, a main control chip 00, a power control unit 10 and a wake-up unit 20. The main control chip 00 is connected to a motor drive power supply control unit and a load control unit 30.

[0052] The motor drive power supply control unit is connected to each motor in the dishwasher, such as the water distribution motor, washing motor, drainage motor, etc., to provide power to each motor.

[0053] The load control unit 30 is electrically connected to other loads except the motor, such as lighting equipment, sensors, controllers, etc., for providing electric energy to other loads.

[0054] First, the power supply control unit 10 in this embodiment will be described.

[0055] The power control unit 10 is connected to the main control chip 00 and the switching power supply 11 respectively, and the switching power supply 11 supplies power to the main control chip 00 through the power control unit 10; when the machine is on standby, the power control unit 10 receives the power-off signal of the main control chip 00 and turns off the power of the main control chip 00, so that the main control chip 00, the motor drive power supply control unit 01 and the load control unit 30 are completely powered off.

[0056] The power control unit 10 includes a transistor Q257, a transistor Q254, a transistor Q253 and a PMOS transistor Q252. Among them: the source of the PMOS transistor Q252 is connected to the collector of the transistor Q253; the gate of the PMOS transistor Q252 is connected to the collector of the transistor Q254 through a resistor R264; a resistor R262 and a capacitor C256 are connected in parallel between the source and the gate of the PMOS transistor Q252; and the drain of the PMOS transistor Q252 is connected to the rated voltage.

[0057] The base of transistor Q253 and the collector of transistor Q254 are connected through resistors R267 and R269 in parallel, and resistors R267 and R268 are connected in parallel to capacitor C258; the emitter of transistor Q253 is connected to the emitter of transistor Q254 and grounded.

[0058] The base of the transistor Q254 is connected to the sleep control signal; the collector of the transistor Q254 is connected to the base of the transistor Q254; and the emitter of the transistor Q257 is grounded.

[0059] Those skilled in the art further explain that when the machine is in standby mode, the main control chip 00 sends a signal to the power control unit 10, the transistor Q257 is turned on, the transistor Q254 is turned off, and the PMOS tube Q252 is turned off, so that the power of the main control chip 00 is turned off. After that, the power control unit 10 maintains the disconnected state when there is no wake-up condition triggered. In this way, the motor drive power supply control unit 01 and the load control unit 30 controlled by the main control chip 00 are all cut off from power, thereby achieving zero power consumption of this part of the circuit.

[0060] Next, the awakening unit 20 in this embodiment is described.

[0061] At least one wake-up unit 20 is provided, and the output end of the wake-up unit 20 is connected to the input end of the power control unit 10; when the machine is on standby, if a fault occurs or there is a user wake-up operation, the corresponding wake-up unit 20 can trigger the power control unit 10 alone, so that the main control chip 00 is powered on and awakened again.

[0062] The awakening unit 20 includes one or more of a first awakening circuit 21 , a second awakening circuit 22 , a third awakening circuit 23 and a fourth awakening circuit 24 .

[0063] It should be noted that the first wake-up circuit 21, the second wake-up circuit 22, the third wake-up circuit 23 and the fourth wake-up circuit 24 are established based on possible safety hazards of the machine or some user operations in order to wake up the machine in time and take corresponding protection measures or response operations.

[0064] The output end of the first awakening circuit 21 is connected to the power control unit 10 , and the input end of the first awakening circuit 21 is connected to the water leakage protector.

[0065] The output end of the second wake-up circuit 22 is connected to the power control unit 10 , and the input end of the second wake-up circuit 22 is connected to the flow meter.

[0066] The output end of the third awakening circuit 23 is connected to the power control unit 10 , and the input end of the third awakening circuit 23 is connected to the display panel button.

[0067] The output end of the fourth awakening circuit 24 is connected to the power control unit 10 , and the input end of the fourth awakening circuit 24 is connected to the machine door lock.

[0068] The first wake-up circuit 21 includes a transistor Q407 and a transistor Q408, wherein: the base of the transistor Q407 is connected to the water leakage protector through a resistor R456; the emitter of the transistor Q407 is grounded; the collector of the transistor Q407 is connected to the base of the transistor Q408 through a parallel resistor R458 and a resistor R460; the emitter of the transistor Q408 is connected to the base of the transistor Q407 through a resistor R457; and the collector of the transistor Q408 is connected to the power control unit 10.

[0069] A person skilled in the art further explained that in the standby mode, when the machine leaks, the water leakage protection switch is disconnected, transistor Q407 is disconnected, and transistor Q408 is turned on, thereby pulling the electrical level down, and the PMOS tube Q252 is turned on again, so that the main control chip 00 is powered on again, and the machine is awakened to take corresponding protective measures.

[0070] The second wake-up circuit 22 includes a transistor Q405 and a capacitor C415, wherein: the base of the transistor Q405 is connected to the flow meter through the capacitor C415; the capacitor C415 is connected in series with the resistor R439 and then connected between the base of the transistor Q405 and the emitter of the transistor Q405 through the parallel resistor R440, the capacitor C416 and the parallel resistor R441, and the diode D413; the collector of the transistor Q405 is connected to the power control unit 10.

[0071] A person skilled in the art further explained that, in the standby mode, when the machine abnormally takes in water, the flow meter generates a signal and supplies power to the base of transistor Q405 through capacitor C415, transistor Q405 is turned on, thereby lowering the electrical level, and PMOS tube Q252 is turned on again, so that the main control chip 00 is powered on again, and the machine is awakened to take corresponding protective measures.

[0072] The third wake-up circuit 23 includes a transistor Q258, a resistor R293, a resistor R292 and a diode D253, wherein: the base of the transistor Q258 is electrically connected to the display panel key through the series resistor R293, and the resistor R293 is connected in parallel with the series resistor 292 and the voltage-stabilizing diode D253; the collector of the transistor Q258 is connected to the power control unit 10.

[0073] A person skilled in the art further explained that in the standby state, once a button is pressed on the display panel, an action signal will be generated, and the high level in the action signal will turn on the transistor Q258, thereby lowering the level, and the PMOS tube Q252 will be turned on again, so that the main control chip 00 is powered on again, and the machine is awakened to make a corresponding response.

[0074] The fourth wake-up circuit 24 includes a transistor Q259 and a transistor Q260, wherein: the base of the transistor Q259 is electrically connected to the machine door lock through a resistor R294; the emitter of the transistor Q260 is connected to the base of the transistor Q259 through a resistor R295; the collector of the transistor Q259 is connected in series with a capacitor C272 and a resistor R297 and then connected to the base of the transistor Q260 in parallel with a diode D254 and a resistor 298; the collector of the transistor Q260 is connected to the power control unit 10.

[0075] Those skilled in the art further explain that, in the standby state, when the door of the machine is opened, since one end of the door lock is connected to a rated voltage, such as a 12V voltage, the rated voltage is disconnected, and the main control chip 00 is re-powered. Specifically, the rated voltage is disconnected, the transistor Q259 is cut off, and the transistor Q260 is turned on, thereby pulling the level down, and the PMOS tube Q252 is turned on again, so that the main control chip 00 is re-powered, and the machine is awakened to make a corresponding response.

[0076] A second aspect of the present invention is to provide a low power standby control method, which is applied to the above-mentioned low power standby control circuit.

[0077] The method mainly includes the following steps:

[0078] S1, the main control chip 00 is powered off: when the machine is in standby mode, the main control chip 00 sends a standby signal to the power control unit 10, so that the transistor Q257 is turned on, the transistor Q254 is turned off, and the PMOS tube Q252 is turned off;

[0079] S2, waking up the main control chip 00 to get power: a single wake-up unit 20 triggers the power control unit 10 alone, so that the main control chip 00 is powered again;

[0080] S21, when the machine leaks, the water leakage protector is disconnected, the transistor Q407 is disconnected, the transistor Q408 is turned on, the level is pulled down, and the PMOS tube Q252 is turned on again, so that the main control chip 00 is powered on and awakened;

[0081] S22, when the machine abnormally inflows water, the flow meter generates a signal, and the base of the transistor Q405 is powered through the capacitor C415, the transistor Q405 is turned on, the level is pulled down, and the PMOS tube Q252 is turned on again, so that the main control chip 00 is powered on and awakened;

[0082] S23, when the key of the display panel of the machine generates a key action signal, the high level in the key action signal turns on the transistor Q258, pulls down the level, and the PMOS tube Q252 turns on again, so that the main control chip 00 is powered on and awakened;

[0083] S24. When the door of the machine is opened, the rated voltage connected to the door lock is disconnected, the transistor Q259 is turned off, the transistor Q260 is turned on, the level is pulled down, and the PMOS tube Q252 is turned on again, so that the main control chip 00 is powered on and awakened.

[0084] The third aspect of the present invention also protects a dishwasher having the above-mentioned low-power standby control circuit.

[0085] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Low power consumption standby control circuit, applied to household appliances, characterized in that: The circuit comprises: Switching power supply (11); A main control chip (00) connected to a motor drive power supply control unit (01) and a load control unit (30); A power control unit (10) is respectively connected to the main control chip (00) and the switch power supply (11) by signals, and the switch power supply (11) supplies power to the main control chip (00) through the power control unit (10); when the machine is in standby mode, the power control unit (10) receives a power-off signal from the main control chip (00) and turns off the power supply of the main control chip (00), so that the main control chip (00), the motor drive power supply control unit (01) and the load control unit (30) are completely powered off; and A wake-up unit (20), wherein the output end of the wake-up unit (20) is connected to the input end of the power control unit (10); when the machine is in standby mode, the wake-up unit (20) can trigger the power control unit (10) so that the main control chip (00) is powered on again.

2. The low power standby control circuit according to claim 1, characterized in that: The power control unit (10) comprises a transistor Q257, a transistor Q254, a transistor Q253 and a PMOS transistor Q252, wherein: The source of the PMOS tube Q252 is connected to the collector of the transistor Q253; the gate of the PMOS tube Q252 is connected to the collector of the transistor Q254; The base of the transistor Q253 is connected to the collector of the transistor Q254; the emitter of the transistor Q253 is connected to the emitter of the transistor Q254 and is grounded; The base of the transistor Q254 is connected to the collector of the transistor Q257; The base of the transistor Q257 is connected to the transistor Q257; the emitter of the transistor Q257 is grounded.

3. The low power standby control circuit according to claim 2, characterized in that: The wake-up unit (20) comprises one or more of a first wake-up circuit (21), a second wake-up circuit (22), a third wake-up circuit (23) and a fourth wake-up circuit (24).

4. The low power standby control circuit according to claim 3, characterized in that: The output ends of the first wake-up circuit (21), the second wake-up circuit (22), the third wake-up circuit (23) and the fourth wake-up circuit (24) are all connected to the power control unit (10); wherein: An input end of the first wake-up circuit (21) is connected to a water leakage protector; An input end of the second wake-up circuit (22) is connected to a flow meter; The input end of the third wake-up circuit (23) is connected to a display panel button; An input end of the fourth wake-up circuit (24) is connected to a machine door lock.

5. The low power standby control circuit according to claim 4, characterized in that: The first wake-up circuit (21) comprises a transistor Q407 and a transistor Q408, wherein: The base of the transistor Q407 is connected to the water leakage protector; the emitter of the transistor Q407 is grounded; The collector of the transistor Q407 is connected to the base of the transistor Q408; The collector of the transistor Q408 is connected to the power control unit (10).

6. The low power standby control circuit according to claim 4, characterized in that: The second wake-up circuit (22) comprises a transistor Q405 and a capacitor C415, wherein: The base of the transistor Q405 is connected to the flow meter via the capacitor C415; the collector of the transistor Q405 is connected to the power control unit (10).

7. The low power standby control circuit according to claim 4, characterized in that: The third wake-up circuit (23) comprises a transistor Q258 and a resistor R293, wherein: The base of the transistor Q258 is electrically connected to the display panel key via the resistor R293 connected in series, and the resistor R293 is connected in parallel with the resistor 292 and the voltage regulator diode D253 connected in series; the collector of the transistor Q258 is connected to the power control unit (10).

8. The low power standby control circuit according to claim 4, characterized in that: The fourth wake-up circuit (24) comprises a transistor Q259 and a transistor Q260, wherein: The base of the transistor Q259 is electrically connected to the machine door lock via a resistor R294; the collector of the transistor Q259 is connected to the base of the transistor Q260; and the collector of the transistor Q260 is connected to the power control unit (10).

9. A low power standby control method, characterized in that: The method is applied to the low-power standby control circuit according to any one of claims 1 to 8.

10. A dishwasher, characterized in that: The invention comprises the low power consumption standby control circuit as described in any one of claims 1 to 8.

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