Electromagnetic lock control module and method, washing machine

Abstract

The application belongs to the technical field of circuit control, and particularly relates to an electromagnetic lock control module and method and a washing machine. The electromagnetic lock control module comprises a first switch circuit and a second switch circuit. The first switch circuit is used for being connected in series between the electromagnetic lock and a first power line, and the first switch circuit is configured to control the first power line to be conducted according to a first control signal. The second switch circuit is used for being connected in series between the electromagnetic lock and a second power line, and the second switch circuit is configured to control the second power line to be conducted according to a second control signal. The first power line is one of a zero line and a fire line, and the second power line is the other of the zero line and the fire line. The washing machine comprises an electromagnetic lock, a controller and the electromagnetic lock control module. The control method of the electromagnetic lock comprises that the first control signal and the second control signal are sent according to a predetermined time sequence, and the second control signal is sent later than the first control signal. The coil of the electromagnetic lock can be prevented from being damaged due to long-time conduction.

Description

Technical Field

[0001] This invention belongs to the field of circuit control technology, specifically relating to an electromagnetic lock control module and method, and a washing machine. Background Technology

[0002] Washing machines are cleaning appliances that use electrical energy to generate mechanical action to wash clothes, and they have become an indispensable appliance in people's daily lives.

[0003] In related technologies, washing machines are equipped with electromagnetic locks to prevent accidental opening. These electromagnetic locks are controlled by a control module connected to the controller. The control module mainly consists of a normally open relay and a switching transistor. The collector of the switching transistor is connected to the relay, the base of the switching transistor is connected to the controller, and the emitter of the switching transistor is grounded. One end of the electromagnetic lock's coil is connected to the live wire, and the other end is connected to the neutral wire through the normally open relay. The controller controls the opening and closing of the normally open relay by controlling the switching transistor; when the normally open relay is closed, the electromagnetic lock operates.

[0004] However, when the normally open relay is short-circuited, the coil of the electromagnetic lock will be energized for a long time, causing damage to the electromagnetic lock. Summary of the Invention

[0005] In order to solve the above-mentioned problems in the prior art, that is, to solve the problem that when the normally open relay is short-circuited in the prior art, the coil of the electromagnetic lock will be energized for a long time, causing damage to the electromagnetic lock, the first aspect of the present invention is to provide an electromagnetic lock control module, the electromagnetic lock control module including a first switching circuit and a second switching circuit;

[0006] The first switching circuit is connected in series between the electromagnetic lock and the first power line, and the first switching circuit is configured to control the first power line to conduct according to the first control signal.

[0007] The second switching circuit is connected in series between the electromagnetic lock and the second power line, and the second switching circuit is configured to control the second power line to conduct according to the second control signal;

[0008] The first power line is one of the neutral wire and the live wire, and the second power line is the other of the neutral wire and the live wire.

[0009] In the preferred embodiment of the electromagnetic lock control module described above, the first switching circuit includes a first relay and a first switching transistor;

[0010] The first relay includes a control section and a switching section;

[0011] The collector of the first switching transistor is connected to the output terminal of the control section, the emitter of the first switching transistor is grounded, and the base of the first switching transistor is used to connect to the first signal output terminal, wherein the first signal input terminal is used to input the first control signal;

[0012] The input terminal of the control section is used to connect to the drive power supply, the input terminal of the switch section is used to connect to the first power line, and the output terminal of the switch section is used to connect to the first end of the electromagnetic lock.

[0013] In the preferred embodiment of the electromagnetic lock control module described above, a first resistor and a second resistor are also included;

[0014] The first resistor is connected in series between the base of the first switching transistor and the first signal input terminal;

[0015] The second resistor is connected in series between the emitter and base of the first switching transistor.

[0016] In the preferred embodiment of the electromagnetic lock control module described above, the second switching circuit includes a switching device and a second switching transistor;

[0017] The output terminal of the switching device is connected to the second terminal of the electromagnetic lock, the control terminal of the switching device is connected to the collector of the second switching transistor, and the input terminal of the switching device is used to connect to the second power line.

[0018] The emitter of the second switching transistor is grounded, and the base of the second switching transistor is used to connect to the second signal input terminal, wherein the second signal input terminal is used to input the second control signal.

[0019] In the preferred embodiment of the electromagnetic lock control module described above, the switching device includes a thyristor and a third resistor;

[0020] The control electrode of the thyristor is connected to the collector of the second switching transistor through the third resistor, the output terminal of the thyristor is connected to the second terminal of the electromagnetic lock, and the input terminal of the thyristor is used to connect to the second power line.

[0021] In the preferred embodiment of the electromagnetic lock control module described above, a fourth resistor and a capacitor are also connected in series between the input and output terminals of the thyristor.

[0022] In the preferred technical solution of the electromagnetic lock control module described above, a fifth resistor and a sixth resistor are also included;

[0023] The fifth resistor is connected in series between the base of the second switching transistor and the second signal input terminal;

[0024] The sixth resistor is connected in series between the emitter and base of the second switching transistor.

[0025] In the preferred embodiment of the electromagnetic lock control module described above, the switching device is a second relay, which includes a control part and a switching part.

[0026] The input terminal of the control section of the second relay is used to connect to the drive power supply, the output terminal of the control section of the second relay is connected to the collector of the second switching transistor, the input terminal of the switching section of the second relay is used to connect to the second power supply line, and the output terminal of the switching section of the second relay is used to connect to the second terminal of the electromagnetic lock.

[0027] A second aspect of the present invention is to provide a washing machine, including an electromagnetic lock, a controller, and the aforementioned electromagnetic lock control module, wherein the electromagnetic lock control module is used to control the locking state of the electromagnetic lock.

[0028] A third aspect of the present invention is to provide a control method for an electromagnetic lock, comprising:

[0029] The first control signal controls the first switching circuit connected in series between the electromagnetic lock and the first power line to be turned on.

[0030] The second control signal controls the second switching circuit connected in series between the electromagnetic lock and the second power line to be turned on.

[0031] The first control signal and the second control signal are issued according to a predetermined timing sequence, and the second control signal is issued later than the first control signal.

[0032] Those skilled in the art will understand that the electromagnetic lock control module and method of the present invention, and the washing machine, include a first switch circuit and a second switch circuit. The first switch circuit is connected in series between the electromagnetic lock and a first power line, and is configured to control the first power line to conduct according to a first control signal. The second switch circuit is connected in series between the electromagnetic lock and the second power line, and is configured to control the second power line to conduct according to a second control signal. The first power line is one of the neutral wire and the live wire, and the second power line is the other of the neutral wire and the live wire. Through the above configuration, a switch is provided between the electromagnetic lock and both the neutral wire and the live wire, so that the electromagnetic lock requires both switches to be turned on to be energized. This provides two-level control of the electromagnetic lock, ensuring that the coil of the electromagnetic lock is not energized for a long time, which could damage the electromagnetic lock. Attached Figure Description

[0033] A preferred embodiment of the electromagnetic lock control module of the present invention will now be described with reference to the accompanying drawings. The drawings are as follows:

[0034] Figure 1This is a block diagram of the electromagnetic lock control module according to an embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram of a control module according to an embodiment of the present invention;

[0036] Figure 3 This is a schematic diagram of another control module according to an embodiment of the present invention;

[0037] Figure 4 This is a schematic diagram of another control module according to an embodiment of the present invention;

[0038] Figure 5 This is a schematic diagram of another control module according to an embodiment of the present invention.

[0039] In the attached image:

[0040] 10 - First switching circuit; 20 - Second switching circuit; 30 - Neutral wire; 40 - Live wire; 50 - Electromagnetic lock;

[0041] K1 - First relay; K2 - Second relay;

[0042] CX1 - Capacitor;

[0043] R1 - First resistor; R2 - Second resistor; R3 - Third resistor; R4 - Fourth resistor; R5 - Fifth resistor; R6 - Sixth resistor;

[0044] Q1 - First switching transistor; Q2 - Second switching transistor;

[0045] TR1 - Silicon Controlled Rectifier (SCR). Detailed Implementation

[0046] First, those skilled in the art should understand that these embodiments are merely for explaining the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0047] It should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0048] In related technologies, washing machines are equipped with electromagnetic locks to prevent accidental opening. These electromagnetic locks are controlled by a control module connected to the controller. The control module mainly consists of a normally open relay and a switching transistor. The collector of the switching transistor is connected to the relay, the base of the switching transistor is connected to the controller, and the emitter of the switching transistor is grounded. One end of the electromagnetic lock's coil is connected to the live wire, and the other end is connected to the neutral wire through the normally open relay. The controller controls the opening and closing of the normally open relay by controlling the switching transistor; when the normally open relay is closed, the electromagnetic lock operates.

[0049] However, when the normally open relay is short-circuited, the coil of the electromagnetic lock will be energized for a long time, causing damage to the electromagnetic lock.

[0050] After careful analysis, the inventors of this disclosure discovered that the main reason for the aforementioned problem is that one end of the electromagnetic lock is directly connected to the live wire, and the other end is connected to the neutral wire through a normally open relay. When the normally open relay is short-circuited, both ends of the electromagnetic lock are directly connected to the live and neutral wires respectively, causing the current in the electromagnet's coil to increase. Prolonged energization of the electromagnetic lock's coil will cause it to burn out. In other words, the existing electromagnetic lock control circuit lacks a protection circuit. Therefore, the inventors of this disclosure have abandoned the existing single-level control scheme and implemented a two-level control system for the electromagnetic lock. This system can promptly disconnect the live or neutral wire from the electromagnetic lock after it is directly connected to the live or neutral wire, preventing the electromagnetic lock's coil from being energized for extended periods and thus avoiding damage to the electromagnetic lock.

[0051] Specifically, the live wire and the neutral wire are each connected to the two ends of the electromagnetic lock through a switching circuit. The conduction of the live wire and the neutral wire is controlled by two switching circuits, realizing two-level control of the electromagnetic lock.

[0052] The electromagnetic lock control module and method of the present invention, as well as the preferred technical solution of the washing machine, are described below with reference to specific embodiments.

[0053] Figure 1 This is a block diagram of the electromagnetic lock control module in this embodiment.

[0054] like Figure 1 As shown, this embodiment provides an electromagnetic lock control module, including a first switching circuit 10 and a second switching circuit 20. The first switching circuit 10 is connected in series between the electromagnetic lock and the neutral wire 30, and is configured to control the neutral wire 30 to conduct according to a first control signal. The second switching circuit 20 is connected in series between the electromagnetic lock and the live wire 40, and is configured to control the live wire 40 to conduct according to a second control signal.

[0055] In another connection method, the first switch circuit 10 is connected in series between the electromagnetic lock and the live wire 40, and correspondingly, the second switch circuit 20 is connected in series between the electromagnetic lock and the neutral wire 30. Below, this embodiment will use the example of "the first switch circuit 10 being connected to the neutral wire 30 and the second switch circuit 20 being connected to the live wire 40" to provide a detailed description of the electromagnetic lock control module.

[0056] In this embodiment, the first control signal and the second control signal can be issued by the controller, that is, the first switching circuit 10 and the second switching circuit 20 are respectively connected to the controller. The controller can be an MCU in the washing machine.

[0057] The first control signal and the second control signal control whether the first switching circuit 10 and the second switching circuit 20 are turned on or off. The first control signal and the second control signal can be voltage signals or current signals. For example, in this embodiment, the first switching circuit 10 and the second switching circuit 20 are turned on or off using a current signal.

[0058] The electromagnetic lock is energized by controlling whether the first switching circuit 10 and the second switching circuit 20 are turned on. In this embodiment, when the first switching circuit 10 and the second switching circuit 20 are turned on simultaneously, the neutral wire 30 and the live wire 40 are also turned on simultaneously, and the electromagnetic lock is energized and enters the working state. When either the first switching circuit 10 or the second switching circuit 20 is turned on, the neutral wire 30 or the live wire 40 is turned on, and the electromagnetic lock is not energized and is in a standby state.

[0059] The switching circuit, consisting of the first switching circuit 10 and the second switching circuit 20, realizes two-level control of the electromagnetic lock. If one of the first switching circuit 10 and the second switching circuit 20 fails, causing the electromagnetic lock to be directly connected to the live wire or the neutral wire, the other of the first switching circuit 10 and the second switching circuit 20 can disconnect the electromagnetic lock from the neutral wire 30 or the live wire 40 in time, ensuring that the electromagnetic lock will not be burned out.

[0060] It should be noted that there are several ways to control the electromagnetic lock to enter the working state:

[0061] The first method: First, the controller sends the first control signal but not the second control signal. Therefore, the first switch circuit 10 conducts after receiving the first control signal 10, while the second switch circuit 20 does not conduct, so that only the neutral wire 30 is connected to the electromagnetic lock. Second, after a first interval, the controller sends the second control signal but not the first control signal. Therefore, the second switch circuit 20 conducts after receiving the second control signal, so that the electromagnetic lock is connected to the live wire 40. Thus, the electromagnetic lock is simultaneously connected to the neutral wire 30 and the live wire 40, and the electromagnetic lock is energized and enters the working state.

[0062] The second method: First, the controller sends a second control signal but not a first control signal. After receiving the second control signal, the second switch circuit 20 is turned on, making the electromagnetic lock connected to the live wire 40. Second, after a second time interval, the controller sends a first control signal but not a second control signal. After receiving the first control signal, the first switch circuit 10 is turned on, making the electromagnetic lock connected to the neutral wire 30. Thus, the electromagnetic lock is simultaneously connected to both the live wire 40 and the neutral wire 30, and the electromagnetic lock is energized and enters the working state.

[0063] The third method: The controller simultaneously sends out the first control signal and the second control signal. After receiving the first control signal, the first switch circuit 10 is turned on, and after receiving the second control signal, the second switch circuit 20 is turned on, so that the electromagnetic lock is connected to the live wire 40 and the neutral wire 30, and the electromagnetic lock is energized and enters the working state.

[0064] It should be noted that the first control signal can be a voltage signal or a current signal. The second control signal can also be a voltage signal or a current signal. In this embodiment, the electromagnetic control module will be described in detail using the example where both the first and second control signals are current signals.

[0065] Figure 2 This is a schematic diagram of a control module provided in this embodiment, which also shows the structure of some parts other than the electromagnetic lock.

[0066] like Figure 2 As shown, the first switching circuit 10 is the first relay K1, and the second switching circuit 20 is the second relay K2. The input terminal of the control section of the first relay K1 is connected to the controller via serial line IO1, and the output terminal is connected to the drive power supply. The input terminal of the switching section of the first relay K1 is connected to the neutral wire 30, and the output terminal is connected to the first terminal of the electromagnetic lock. The first terminal of the control section of the second relay K2 is connected to the controller via serial line IO2, and the second terminal is connected to the drive power supply. The input terminal of the switching section of the second relay K2 is connected to the live wire 40, and the output terminal is connected to the second terminal of the electromagnetic lock.

[0067] In this embodiment, both the first relay K1 and the second relay K2 can be normally open relays. When the coil of the control section is not energized, the two contacts of the switch section are open; when energized, the two contacts close, causing the switch section to conduct.

[0068] Taking the first method of controlling the electromagnetic lock to enter the working state as an example, we can illustrate the selectable working modes of the electromagnetic lock:

[0069] refer to Figure 2The first control signal sent from the controller is transmitted to the control part of the first relay K1 through IO1, which makes the control part of the first relay K1 conduct, thereby driving the current in the power supply to flow into the control part of the first relay K1, and then the switching part of the first relay K1 conducts, and the neutral wire 30 is connected to the first end of the electromagnetic lock.

[0070] The second control signal sent from the controller is transmitted to the control part of the second relay K2 through IO2, which turns on the control part of the second relay K2, thereby driving the current in the power supply to flow into the control part of the second relay K2, and then turning on the switching part of the second relay K2, so that the live wire 40 is connected to the second end of the electromagnetic lock.

[0071] Since the neutral wire 30 and the live wire 40 are connected to the mains power, after the neutral wire 30 and the live wire 40 are connected to the electromagnetic lock, the current flows from the neutral wire 30 to the live wire 40, or the current flows from the live wire 40 to the neutral wire 30.

[0072] The conduction of the first relay K1 and the second relay K2 is controlled by the first control signal and the second control signal, respectively, thereby realizing the two-level control of the electromagnetic lock.

[0073] Figure 3 This is a schematic diagram of another control module provided in this embodiment, which also shows part of the structure of the electromagnetic lock.

[0074] Please refer to this as well. Figure 2 and Figure 3 The difference between the two is: Figure 3 The control module also includes a first switch Q1, a second switch Q2, a first resistor R1, a second resistor R2, a fifth resistor R5, and a sixth resistor R6.

[0075] The collector of the first switching transistor Q1 is connected to the output terminal of the control section of the first relay K1, the emitter of the first switching transistor Q1 is grounded, the base of the first switching transistor Q1 is connected to the first signal output terminal, and the first signal input terminal is used to input the first control signal.

[0076] The collector of the second switch Q2 is connected to the output terminal of the control section of the second relay K2. The emitter of the second switch Q2 is grounded. The base of the second switch Q2 is used to connect to the second signal output terminal. The second signal input terminal is used to input the second control signal.

[0077] The first resistor R1 is connected in series between the base of the first switching transistor Q1 and the first signal input terminal; the second resistor R2 is connected in series between the emitter and base of the first switching transistor Q1. The configuration of the first resistor R1 and the second resistor R2 can improve the performance of the first switching transistor Q1.

[0078] By setting a first resistor R1, the current flowing into the base of the first switching transistor Q1 can be limited, preventing excessive current from damaging the first switching transistor Q1 and improving its service life. The resistance value of the first resistor R1 is determined based on the first switching transistor Q1; for example, in this embodiment, the resistance value of the first resistor R1 is 4K7.

[0079] By setting a second resistor R2, the anti-interference capability of the first switching transistor Q1 can be improved. The resistance value of the second resistor R2 is determined based on the first switching transistor Q1; for example, in this embodiment, the resistance value of the second resistor R2 is 10KΩ.

[0080] The fifth resistor R5 is connected in series between the base of the second switching transistor Q2 and the second signal input terminal; the sixth resistor R6 is connected in series between the emitter and base of the second switching transistor Q2. This configuration ensures the normal operation of the second switching transistor Q2 over a long period.

[0081] The fifth resistor R5 limits the current flowing into the control electrode of the second switching transistor Q2, preventing damage to Q2. The value of the fifth resistor R5 is determined by the value of the second switching transistor Q2; for example, the value of the fifth resistor R5 is 4KΩ.

[0082] The interference immunity of the second switch Q2 can be improved by using the sixth resistor R6. The resistance value of the sixth resistor R6 is determined according to the second switch Q2; for example, the resistance value of the sixth resistor R6 is 10K.

[0083] Figure 3 The operation of the control module shown can be described as follows:

[0084] First, the first control signal is transmitted from the serial line IO1 to the base of the first switching transistor Q1. That is, there is current in the base of the first switching transistor Q1. At this time, the collector and emitter of the first switching transistor Q1 are connected, and the current can flow from the collector to the emitter of the first switching transistor Q1. As a result, the control part of the first relay K1 is turned on and energized, so that the switching part of the first collector K1 is closed, thereby connecting the electromagnetic lock with the neutral line 30.

[0085] Secondly, the second control signal is transmitted from the serial line IO2 to the base of the second switch Q2. That is, there is current in the base of the second switch Q2. At this time, the collector and emitter of the second switch Q2 are connected, and the current can flow from the collector to the emitter of the second switch Q2. As a result, the control part of the second relay K2 is turned on and energized, so that the switching part of the second collector K2 is closed, thereby connecting the electromagnetic lock with the live wire 40.

[0086] After the electromagnetic lock is connected to the live wire 40 and the neutral wire 40, the electromagnetic lock is energized and enters the working state.

[0087] The control method for de-energizing the electromagnetic lock is simply to ensure that there is no current in the base of the switching transistor; in other words, a low-level signal is applied to the base of the switching transistor.

[0088] Figure 4 This is a schematic diagram of another control module provided in this embodiment, which also illustrates part of the structure of the electromagnetic lock.

[0089] Please refer to this as well. Figure 4 and Figure 3 The difference between the two is: Figure 4 The control module replaces the second relay K2 with a thyristor TR1 and a fourth resistor R4. The control electrode of the thyristor TR1 is connected to the collector of the second switch Q2 through the fourth resistor R4. The output terminal of the thyristor TR1 is connected to the second terminal of the electromagnetic lock, and the input terminal of the thyristor TR1 is connected to the live wire 40.

[0090] Specifically, the control electrode of the thyristor TR1 is connected to the first terminal of the fourth resistor R4, the main electrode T2 of the thyristor TR1 is connected to the live wire 40, and the main electrode T1 of the thyristor TR1 is connected to the second terminal of the electromagnetic lock. The second terminal of the fourth resistor R4 is connected to the collector of the second switching transistor Q2.

[0091] It should be noted that, since the washing machine is connected to the mains power supply and the electromagnetic lock is always energized when in operation, the thyristor TR1 is a bidirectional thyristor.

[0092] The fourth resistor R4 limits the current in the control electrode of the silicon controlled rectifier TR1, preventing excessive current from damaging the TR1. The value of the fourth resistor R4 can be determined based on the value of the TR1.

[0093] because Figure 3 and Figure 4 The first switching circuit 10 in the middle is the same, therefore Figure 4 The operation mode of the first switching circuit 10 in the middle is the same as Figure 3 The operation mode of the first switching circuit 10 in the middle is the same.

[0094] refer to Figure 4The second switching circuit 20 can operate as follows: First, the second control signal is transmitted from the serial line IO2 to the base of the second switching transistor Q2. That is, there is current in the base of the second switching transistor Q2. At this time, the collector and emitter of the second switching transistor Q2 are connected, and the current can flow from the collector to the emitter of the second switching transistor Q2. Therefore, the current in the live wire 40 is divided into two paths. The first path of current enters the control electrode of the thyristor TR1, making the main electrode T1 and T2 of the thyristor TR1 in a low resistance state. The thyristor TR1 can be turned on, so that the second terminal of the electromagnetic lock is connected to the live wire 40, and the current in the live wire 40 can flow into the electromagnetic lock through the thyristor TR1.

[0095] Turning off the thyristor TR1 only requires disabling the second switch Q2, meaning there is no current in the base of the second switch Q2, thus preventing the emitter and collector of the second switch Q2 from conducting.

[0096] Figure 5 This is a schematic diagram of another control module provided in this embodiment, which also illustrates part of the structure of the electromagnetic lock.

[0097] Please refer to this as well. Figure 4 and Figure 5 The difference between the two is: Figure 5 The control module also includes a third resistor R3 and a capacitor CX1 connected in series between the input and output terminals of the thyristor TR1.

[0098] The third resistor R3 and capacitor CX1 connected in series form an absorption circuit, which can protect the thyristor TR1 and prevent it from being damaged after the thyristor TR1 is not conducting.

[0099] Because the coil of the electromagnetic lock has the characteristic of storing energy, when the thyristor TR1 is not conducting, the current and voltage accumulated in the coil of the electromagnetic lock will be released, thus being loaded onto the thyristor TR1. This will continuously break down the thyristor TR1, affecting its performance and increasing its failure rate.

[0100] like Figure 5 As shown, after the thyristor TR1 is not conducting, the current and voltage in the coil of the electromagnetic lock are applied to the absorption circuit through the third resistor R3 and the capacitor CX1 to protect the thyristor TR1.

[0101] This embodiment also provides a washing machine, including an electromagnetic lock, a controller, and the aforementioned electromagnetic lock control module. The electromagnetic lock control module is used to control the locking state of the electromagnetic lock.

[0102] By controlling the locking state of the electromagnetic lock through the electromagnetic lock control module, the direct connection between the electromagnetic lock and the power supply can be avoided, which could cause the electromagnetic lock to burn out.

[0103] This embodiment also provides a control method for an electromagnetic lock, including:

[0104] The first control signal controls the first switching circuit 10 connected in series between the electromagnetic lock and the neutral wire 30 to be turned on.

[0105] The second control signal controls the second switching circuit 20 connected in series between the electromagnetic lock and the live wire 40 to be turned on.

[0106] The first control signal and the second control signal are issued according to a predetermined timing sequence, and the second control signal is issued later than the first control signal.

[0107] Due to the requirements of the electromagnetic lock's operating principle, the operation time of driving the electromagnetic lock must not exceed 20ms. Therefore, by optimizing the sequence and interval of the first switch circuit 10 and the second switch circuit 20, the operation time of the electromagnetic lock is made less than 20ms.

[0108] like Figure 5 As shown, the first switching circuit 10 is first turned on, and after a predetermined interval, the second switching circuit 20 is then turned on. The interval between the first switching circuit 10 and the second switching circuit 20 is within 10ms. When closing the electromagnetic lock, the second switching circuit 20 is turned off first, followed by the first switching circuit 10.

[0109] It should be noted that because the switching speed of the thyristor TR1 is very fast, the second switching circuit 20 turns on after the first switching circuit 10 turns on, making the action time of the electromagnetic lock less than 20ms. At the same time, by controlling the interval between the thyristor TR1 and the first switching circuit 10 to within 10ms, even if the thyristor TR1 is mis-turned on, the noise generated by the thyristor TR1 will be connected with the normal waveform, preventing the driving logic of the electromagnetic lock from reversing. For example, the electromagnetic lock in the locked state will not suddenly open.

[0110] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. An electromagnetic lock control module, characterized by, The first switch circuit and the second switch circuit are connected in series between the electromagnetic lock and the first power line, and the first switch circuit is configured to control the first power line to be conductive according to a first control signal. The second switch circuit is connected in series between the electromagnetic lock and the second power line, and the second switch circuit is configured to control the second power line to be conductive according to a second control signal. The first power line is one of a zero line and a live line, and the second power line is the other of the zero line and the live line. The second switch circuit includes a switching device and a second switch tube. The output end of the switching device is connected to the second end of the electromagnetic lock, the control end of the switching device is connected to the collector of the second switch tube, and the input end of the switching device is used to be connected to the second power line. The emitter of the second switch tube is grounded, and the base of the second switch tube is used to be connected to a second signal input end, wherein the second signal input end is used to input the second control signal. The switching device includes a bidirectional thyristor and a fourth resistor. The control end of the bidirectional thyristor is connected to the collector of the second switch tube through the fourth resistor, the output end of the bidirectional thyristor is connected to the second end of the electromagnetic lock, and the input end of the bidirectional thyristor is used to be connected to the second power line. The input end of the bidirectional thyristor is connected in series with the output end of the bidirectional thyristor through a third resistor and a capacitor, and the series connection of the third resistor and the capacitor constitutes an absorption circuit, which is used to protect the bidirectional thyristor after the bidirectional thyristor is not conductive. Further comprising a fifth resistor and a sixth resistor. The fifth resistor is connected in series between the base of the second switch tube and the second signal input end, and the sixth resistor is connected in series between the emitter and the base of the second switch tube. The first switch circuit includes a first relay and a first switch tube.

2. The electromagnetic lock control module of claim 1, wherein, The first relay includes a control part and a switch part. The collector of the first switch tube is connected to the output end of the control part, the emitter of the first switch tube is grounded, and the base of the first switch tube is used to be connected to a first signal output end, wherein a first signal input end is used to input the first control signal. The input end of the control part is used to be connected to a driving power supply, the input end of the switch part is used to be connected to the first power line, and the output end of the switch part is used to be connected to the first end of the electromagnetic lock. Further comprising a first resistor and a second resistor.

3. The electromagnetic lock control module of claim 2, wherein, The first resistor is connected in series between the base of the first switch tube and the first signal input end. The second resistor is connected in series between the emitter and the base of the first switch tube. The electromagnetic lock, a controller, and the electromagnetic lock control module of any one of claims 1-3 are used to control the locking state of the electromagnetic lock.

4. A laundry machine characterized by The first switch circuit and the second switch circuit are connected in series between the electromagnetic lock and the first power line, and the first switch circuit is configured to control the first power line to be conductive according to a first control signal.

5. A control method of an electromagnetic lock, the electromagnetic lock being controlled by the electromagnetic lock control module according to any one of claims 1 to 3, characterized in that, The second switch circuit is connected in series between the electromagnetic lock and the second power line, and the second switch circuit is configured to control the second power line to be conductive according to a second control signal. ​ ​ The first control signal and the second control signal are issued according to a predetermined timing, and the second control signal is issued later than the first control signal.

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