TWI880851B - Electric window blind having a halting function while encountering obstacles and having overload protection - Google Patents

Abstract

An electric window blind having a halting function while encountering obstacles and having overload protection is disclosed. The electric window blind mAinly includes a current monitoring unit and a processing unit disposed in a control device. The processing unit includes a first detecting mode. The first detecting mode is applied by monitoring respective mAximum currents while lifting and descending a covering sheet normAlly. The monitored mAximum currents are respectively defined as a first basis current and a second basis current and stored. The processing unit can further include a second detecting mode. The second detecting mode is applied by defining a third basis current. The third basis current is an instant current occurring at a preceding time point prior to a current instant current occurring at a time point right after the preceding time point. Accordingly, a drive motor of the electric window blind halts under the control of the processing unit if the current instant current is larger than the first basis current, the second basis current, or the third basis current. Thus, a halting function performed while the covering sheet encounters obstacles and a function of overload protection can be attained.

Description

Electric blinds with stop and overload protection functions

The present invention relates to an electric curtain, in particular to an electric curtain with the functions of collision stop and overload protection.

Curtains are used to effectively block the outdoor sunlight to control the indoor brightness and darkness, and to prevent the indoor temperature from rising due to sunlight. At the same time, they can also achieve a shielding effect to ensure the privacy of people indoors. In response to the needs of operation mode and convenience, they have gradually evolved into electric curtains driven by electricity. Electric curtains are mainly controlled by a controller to drive a motor, and then connected to the drive motor. The electric curtain is driven by a transmission device to move the curtain, thereby achieving the function of expanding or closing the curtain. The electric curtain is driven by electricity, which not only reduces the inconvenience of manual operation, but also extends to methods such as near-end remote control, smart networking, and even automatic adjustment of light blocking through light sensing, so that the electric curtain can achieve more application levels and effectively improve the convenience of use.

However, after actual use, it was found that when the electric curtain fabric touches an obstacle during the descent process, the drive motor will continue to drive, which can easily cause the curtain fabric to be pulled and torn by the obstacle, and even worse, cause the electric curtain to malfunction. If the obstacle is a person, there will be concerns about affecting personal safety. In addition, when the electric curtain fabric is raised and is hooked by an obstacle, in addition to the drive motor, The continuous rotation of the motor will cause the curtain to be pulled or even torn. At the same time, when the upward resistance is generated, the driving motor will continue to increase the current, which may even cause the driving motor to overload and malfunction. The existing overload protection mainly sets the maximum current that the driving motor can withstand. However, this setting may still cause the curtain to be pulled and torn when the curtain is hooked by an obstacle and pulled, which really needs to be improved.

Therefore, the purpose of the present invention is to provide an electric window curtain with a stop and overload protection function, so that the electric window curtain has the effect of stopping and avoiding overload.

Therefore, the present invention provides an electric window curtain with a stop and overload protection function, which mainly comprises a control device comprising a current detection unit for detecting the instantaneous current of the driving motor, and a processing unit respectively connected to the current detection unit and the driving motor; wherein the processing unit is provided with a first detection mode, and the current detection unit will detect the instantaneous current of the driving motor, so that the electric window curtain, in the normal descending and ascending process, first captures the maximum current of the driving motor when descending and the maximum current of the driving motor when ascending, respectively, and stores them as a first reference current and a second reference current respectively. In the processing unit, in the subsequent descending or ascending operation process, the current detection unit can detect the real-time current required for the operation of the driving motor in real time, and use the real-time current to compare with the first reference current or the second reference current. When the real-time current in the descending operation process is greater than the first reference current, or when the real-time current in the ascending operation process is greater than the second reference current, the processing unit determines that the first detection mode is applicable, and the processing unit can determine that the electric curtain is in the situation of encountering an obstacle or overload, and then control the driving motor to stop power output, so as to achieve the function of electric curtain stopping or overload protection.

The above-mentioned other technical contents, features and effects of the present invention will be clearly understood in the following detailed description of the preferred embodiments with reference to the drawings.

Referring to Fig. 1 and Fig. 2, the first preferred embodiment of the electric curtain 3 with the function of collision stop and overload protection of the present invention comprises a frame 31, a shielding member 32 arranged on the frame 31, a transmission device 33 arranged on the frame 31 and driving the shielding member 32 to actuate, a driving motor 34 driving the driving motor 33 to actuate, and a control device 35 controlling the actuation of the driving motor 34; and the aforementioned electric curtain 3 can be a general lifting electric curtain 3, a multi-stage opening and closing electric curtain 3, an electric dimming curtain, a silk blind curtain, etc., and the drawings in this embodiment are illustrated by taking a general lifting electric curtain 3 as an example.

As mentioned above, the control device 35 includes a current detection unit 351 for detecting the real-time current of the drive motor 34, and a processing unit 352 respectively connected to the current detection unit 351 and the drive motor 34; wherein the processing unit 352 stores the driving instructions and the operating current of the required operation stroke, and the processing unit 352 is provided with a first detection mode, the current detection unit 351 will detect the real-time current of the drive motor 34, and in the normal operation process, First, the current detection unit 351 detects the maximum current of the driving motor 34 during the descending process of the shielding member 32 and the maximum current during the ascending process, so that the maximum current during the descending process is used as a first reference current, and the maximum current during the ascending process is used as a second reference current, and the first reference current and the second reference current are stored in the processing unit 352, so that when the instantaneous current of the driving motor 34 is greater than the first reference current during the descending process of the electric curtain 3, the electric curtain 3 is automatically closed. When the electric curtain 3 hits an obstacle, or when the electric curtain 3 is in the process of rising, when the instantaneous current driving the driving motor 34 is greater than the second reference current, the processing unit 352 will determine that it is overloaded. The above two situations are judged to be applicable to the first detection mode, and the processing unit 352 will control the driving motor 34 to stop running. Furthermore, in this embodiment, the first reference current can be the maximum current plus a first wide current. For example, if the maximum current is 1000mA and the first wide current is set to 50mA, the first reference current is 1050mA. In addition, the second reference current can be the sum of the maximum current and the second wide current. For example, if the maximum current is 1000mA and the second wide current is set to 100mA, the second reference current is 1100mA. The following embodiments are described by taking the first wide current and the second wide current as examples.

Referring to FIG. 1 , FIG. 2 , and FIG. 3 , when the present embodiment is implemented, the first reference current can be obtained when the shielding member 32 is actually operated to drop from the top to the bottom, and the processing unit 352 captures the maximum current in this operation process and adds the set first wide current through the current detection unit 351 to use the first reference current; referring to FIG. 4 , when the shielding member 32 rises from the bottom to the top, the processing unit 352 captures the maximum current in this operation process and adds the set second wide current through the current detection unit 351 to use the second reference current, thereby completing the setting of the first and second reference currents.

Referring to FIG. 1, FIG. 2, and FIG. 5, when the electric window curtain 3 is used, as the shielding member 32 gradually moves downward, the more the shielding member 32 moves downward, the driving current of the driving motor 34 will gradually decrease as the shielding member 32 moves downward due to its own weight and gravity. When the shielding member 32 touches an obstacle, the obstacle will form a pressure on the shielding member 32. The resistance force increases the current required by the drive motor 34 to drive the shielding member 32. Therefore, the real-time current detected by the current detection unit 351 will be greater than the maximum current in the normal operation descent process, that is, the real-time current will be greater than the first reference current. The processing unit 352 determines that the first detection mode is applicable, and the processing unit 352 will control the drive motor 34 to stop power output.

On the contrary, when the electric window curtain 3 rises, the shielding member 32 is rolled up from the bottom end of the electric window curtain 3 and rises to the top end. When the shielding member 32 is closer to the top end, the self-weight of the shielding member 32 will gradually decrease, that is, the load required by the drive motor 34 for the shielding member 32 will increase. When the shielding member 32 is pulled or hooked by the obstacle during the rising process, in order to maintain the rising speed of the drive motor 34 driving the transmission device 33 to drive the shielding member 32, the driving current required by the drive motor 34 will increase. At this time, when the current detection unit 351 detects that the instantaneous current is greater than the second base current, the driving current of the drive motor 34 will increase. When the current is lower than the first and second reference currents, the processing unit 352 determines that the first detection mode is applicable. When the current is higher than the first and second reference currents, the processing unit 352 determines that the first detection mode is applicable. When the current is higher than the first and second reference currents, the processing unit 352 controls the driving motor 34 to stop power output, thereby effectively preventing the shielding member 32 from being pulled and damaged. Therefore, the real-time current of the driving motor 34 of the electric window curtain 3 detected by the current detection unit 351 is compared with the first and second reference currents respectively. If the real-time current required is greater than the first and second reference currents, the processing unit 352 controls the driving motor 34 to stop power output, thereby achieving the effect of stopping when encountering an obstacle and overload protection.

Referring to FIG. 6 and FIG. 7, the second preferred embodiment of the electric window curtain 3 with the function of collision stop and overload protection of the present invention, the present embodiment still has the structure, action and effect of the first embodiment, and the special feature of the present embodiment is that the processing unit 352 is additionally provided with a second detection mode, according to the descending stroke of the shielding member 32, the descending stroke is divided into a plurality of segments at different time points, and the current detection unit 351 detects the descending stroke of the shielding member 32. The real-time current detected by the segment is set in a decreasing manner, and the real-time current obtained by the segment at a time point earlier than the current operating time point is defined as a third reference current. When the real-time current generated by the shielding element 32 at the current operating time point is greater than the third reference current, the processing unit 352 determines that the second detection mode is applicable, and then the processing unit 352 controls the drive motor 34 to stop power output.

Continuing with the above, when in use, for example, the descending stroke of the electric window curtain 3 is divided into a plurality of segments according to different time points, such as time 1 to time 10, and the real-time current detected in each time segment from top to bottom is set to decrease, for example, the real-time current at time 1 is 10 mA, the real-time current at time 2 is 9 mA... and so on until the real-time current at time 10 is 1 mA, as shown in the following table: Time point 1 2 3 4 5 6 7 8 9 10 Current 10mA 9mA 8mA 7mA 6mA 5mA 4mA 3mA 2mA 1mA

Assuming that the current operation time point is time 5 and the real-time current is 6 mA, the real-time current obtained in a segment one time point before the current operation time point is defined as a third reference current, that is, the real-time current 7 mA at time point 4 of the segment before time point 5 is defined as the third reference current. Therefore, when the real-time current detected by the current detection unit 351 at time point 5 is greater than 7 mA, the processing unit 352 determines that the second detection mode is applicable, and then the processing unit 352 controls the drive motor 34 to stop power output. Furthermore, in this embodiment, the third reference current is the real-time current of the previous time point. The sum of the real-time current obtained from the segment before the time point 5 plus a third wide current, for example, the third wide current is 1mA, that is, the real-time current 7mA at time point 4 of the segment before time point 5 is added to the third wide current 1mA to define the third reference current (8mA). Therefore, when the real-time current detected by the current detection unit 351 at time point 5 is greater than 8mA, the processing unit 352 determines that the second detection mode is applicable. Therefore, in this embodiment, by using the first detection mode and the second detection mode in combination, the effects of stopping when encountering obstacles and overload protection can be performed more accurately.

To summarize the above, the electric window curtain with the function of stopping and overload protection of the present invention utilizes the control device having the structure of the current detection unit and the processing unit, so that the current detection unit of the control device will detect the normal operation process, and the maximum current in the process of descending and the maximum current in the process of ascending of the electric window curtain are respectively stored in the processing unit as a first and a second reference current, so that in the subsequent operation process, if the required current is less than or greater than the first and the second reference currents, the processing unit will control the driving motor to stop the power output, thereby achieving the function of stopping precisely when encountering an obstacle.

However, the above is only to illustrate the preferred embodiment of the present invention, and should not be used to limit the scope of implementation of the present invention. In other words, all simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the invention specification should still fall within the scope of the present invention patent.

[The present invention] 3: Electric blinds 31: Frame 32: Shielding element 33: Transmission device 34: Driving motor 35: Control device 351: Current detection unit 352: Processing unit

Figure 1 is a schematic diagram of the structure of the first preferred embodiment. Figure 2 is a block diagram of the controller of the first preferred embodiment. Figure 3 is a block diagram of the descending setting and operation flow of the first preferred embodiment. Figure 4 is a block diagram of the ascending setting and operation flow of the first preferred embodiment. Figure 5 is a judgment flow chart of the first preferred embodiment. Figure 6 is a block diagram of the controller of the second preferred embodiment. Figure 7 is a judgment flow chart of the first preferred embodiment.

3: Electric blinds

31: Framework

32: Shielding piece

33: Transmission device

34: Driving motor

35: Control device

351: Current detection unit

352: Processing unit

Claims (4)

An electric window curtain with collision stop and overload protection functions, comprising a frame, a shielding member arranged on the frame, a transmission device arranged on the frame and driving the shielding member to move, a driving motor driving the transmission device to move, and a control device controlling the movement of the driving motor; its characteristics are: The control device includes a current detection unit for detecting the instantaneous current of the driving motor, and a processing unit connected to the current detection unit and the driving motor respectively: wherein the processing unit stores the driving instructions and the operating current of the required operation process, and the processing unit is provided with a first detection mode and a second detection mode, and the maximum current of the driving motor in normal operation is stored in the processing unit by the current detection unit as a first reference current and a second reference current respectively, when the instantaneous current of the subsequent descending operation process is greater than the first reference current, or the instantaneous current of the ascending operation process is greater than the second reference current, the The processing unit determines that the first detection mode is applicable, and then the processing unit controls the drive motor to stop power output; at the same time, according to the descending stroke of the shielding element, the descending stroke is divided into a plurality of segments at different time points, and the real-time current detected by the current detection unit for the segments is set in a decreasing manner, and the real-time current obtained from a segment at a time point earlier than the current operating time point is defined as a third reference current. When the real-time current generated by the shielding element at the current operating time point is greater than the third reference current, the processing unit determines that the second detection mode is applicable, and then the processing unit controls the drive motor to stop power output. According to claim 1, the electric window curtain with the function of stopping and overload protection, wherein the first reference current is the sum of the maximum current and a first wide current. According to claim 1, the electric curtain with stop and overload protection functions, wherein the second reference current is the sum of the maximum current and a second wide current. According to claim 1, the electric window curtain with the function of stopping and overload protection, wherein the third reference current is the sum of the instantaneous current obtained from the segment at the previous time point plus a third wide current.

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