TECHNICAL FIELD

The present invention relates to a power fetching system for a no neutral switch and a control method Thereof, and a no neutral switch.

BACKGROUND

With the development of technology and improvement of the living standard, consumers have put forward new requirements for the use of home. For example, for an electric appliance with lighting function, consumers not only require easy control of the lighting time and brightness of the lighting device, but also require the lighting device to cooperate with other systems of the home to meet the requirements of consumers for lighting scenes in different life situations. Consumers need a smart switch control system to enhance the quality of life and want to ensure the convenience and comfort of life.

In this regard, the traditional switch has obvious defects. It does not have a remote-control function, and it cannot meet the lighting needs of consumers for different scenes. In contrast, electronic switches have broad application prospects. On the one hand, since the installation and replacement of electronic switches are convenient and simple, electronic switches can be used to directly replace traditional wall switches that are very popular in traditional home. On the other hand, the electronic switches can also be used to conveniently implement remote control or smart control. For example, the ZigBee smart switch in the smart home has functions such as wireless remote control and touch sensing. However, since when the electronic switch is closed, the voltage across the electronic switch is insufficient to supply power to its own electronic devices. Therefore, an off-state power supply module is provided in the electronic switch for fetching power for the electronic switch when the load (for example, a lighting device) controlled by the electronic switch is turned off. In addition, since the load controlled by the electronic switch has an uncertainty, for example, the electronic switch can be used to control a non-dimmable LED, a dimmable LED, a smart lamp, an incandescent lamp, etc., it becomes difficult to solve the power supply problem of the electronic switch.

SUMMARY

The present invention provides a power fetching system for a no neutral switch. The power fetching system is connected to an electrical device and a wireless controller, and the wireless controller controls a switch module for changing an operating state of the electrical device. The power fetching system includes: a power fetching module, connected between a power source and the wireless controller, the power source supplying power to the wireless controller and the electrical device, where the power fetching module is configured to obtain power from the power source and supply the obtained power to the wireless controller during energization of the electrical device; and a control module, connected to the power fetching module, and configured to detect power consumption of the wireless controller and provide a control signal to the power fetching module according to a change in power consumption of the wireless controller to adjust the power obtained by the power fetching module from the power source. The power fetching system according to the present invention can dynamically adjust the power obtained from the power source according to the power consumption condition of the wireless controller as the load, and thus, for example, can obtain more and sufficient power in the two-wire electrical control system to meet the needs for use of both high-power-consumption wireless controllers (such as WIFI or WIFI/BLE dual-mode) and low-power-consumption wireless controllers.

According to an embodiment of the power fetching system of the present invention, the control module detecting the power consumption of the wireless controller includes detecting a voltage characterizing the power consumption of the wireless controller, and gradually adjusting a duty cycle of the control signal according to the change in the detected voltage. Thus, a simple way to detect the power consumption of the wireless controller is provided to dynamically determine the power consumption condition of the current wireless controller, thereby preparing for the power fetching system to determine whether to draw more or less power.

According to an embodiment of the power fetching system of the present invention, the control module is configured to: adjust the duty cycle of the control signal to a first predetermined duty cycle when the detected voltage is greater than a first threshold; reduce the duty cycle of the control signal from the first predetermined duty cycle to a second predetermined duty cycle when the detected voltage is less than a second threshold, where the second threshold is less than the first threshold; and reduce the duty cycle of the control signal from the second predetermined duty cycle to a third predetermined duty cycle when the detected voltage is less than a third threshold, where the third threshold is less than the second threshold. By adopting the open-loop control logic to determine the power consumption condition of the wireless controller, the power will not be drawn immediately or suddenly due to the high power consumption of the load, thereby avoiding affecting the normal use of electrical devices (for example, lighting devices) due to too fast or too intense power fetching, and making the power fetching system suitable for many different types of electrical devices.

According to an embodiment of the power fetching system of the present invention, the control module is configured to gradually reduce the duty cycle of the control signal by a predetermined amount. The control module can achieve a smooth change in the duty cycle by setting a small predetermined amount of change, so that the power fetching system does not cause a drastic change in voltage due to the change in the power consumption of the wireless controller.

According to an embodiment of the power fetching system of the present invention, the power fetching module includes: a power fetching load, connected in series with the electrical device. The power fetching load can be used to provide a stable impedance to the electrical load, so that the power fetching module can obtain stable and sufficient power. The power fetching load may be implemented as a single component or as a circuit including multiple components. The power fetching load provided according to the present invention can be continuously turned on to draw power when the electrical device is in operation.

According to an embodiment of the power fetching system of the present invention, the power fetching module further includes: a plurality of switching units, connected in parallel with the power fetching load, where the plurality of switching units are turned on or off according to the control signal. By adjusting the closing time of the plurality of switching units, the power drawn by the power fetching module can be effectively adjusted, thereby adjusting the power supplied to the load of the wireless controller.

According to an embodiment of the power fetching system of the present invention, the power fetching module further includes: a rectifier circuit, configured to cooperate with the plurality of switching units to obtain power during a positive half cycle and a negative half cycle of the power source. The power fetching module can maximize the user of the power supplied by the alternating current and improve the power fetching efficiency.

According to an embodiment of the power fetching system of the present invention, the plurality of switching units include two MOS transistors connected in reverse series. The control signal, such as a pulse width modulation signal, provided to the two MOS transistors connected in series, is adjusted depending on the power consumption of the wireless controller.

According to an embodiment of the power fetching system of the present invention, the electrical device is a lighting device. Thus, the power fetching system of the present invention can avoid flickering of the lighting device during operation due to too fast or too intense power fetching.

According to another aspect of the present invention, the present invention further provides a no neutral switch, including: the power fetching system as described above; a power converter, configured to convert a voltage output by the power fetching system into a supply voltage; and a wireless controller, configured to obtain power from the supply voltage to control an operating state of the electrical device.

According to another aspect of the present invention, the present invention further provides a method of controlling the power fetching system for the no neutral switch. The power fetching system is connected to an electrical device and a wireless controller, the wireless controller controls a switch module for changing an operating state of the electrical device, and the power fetching system includes a power fetching module and a control module. The method includes: obtaining power from the power source by the power fetching module and supplying the obtained power to the wireless controller during energization of the electrical device; and detecting power consumption of the wireless controller by the control module and providing a control signal to the power fetching module according to a change in power consumption of the wireless controller to adjust the power obtained by the power fetching module from the power source. According to the present invention, the power obtained from the power source can be dynamically adjusted, thereby meeting the needs for use of both high-power-consumption wireless controllers and low-power-consumption wireless controllers.

According to the method of controlling the power fetching system for the no neutral switch according to the present invention, the detecting the power consumption of the wireless controller by the control module includes: detecting a voltage characterizing the power consumption of the wireless controller by the control module, and gradually adjusting a duty cycle of the control signal according to the change in the detected voltage. Thus, the power consumption condition of the current wireless controller can be dynamically determined, thereby preparing for the power fetching system to determine whether to draw more or less power.

According to the method of controlling the power fetching system for the no neutral switch according to the present invention, the gradually adjusting the duty cycle of the control signal includes: adjusting the duty cycle of the control signal to a first predetermined duty cycle by the control module when the detected voltage is greater than a first threshold; reducing the duty cycle of the control signal from the first predetermined duty cycle to a second predetermined duty cycle by the control module when the detected voltage is less than a second threshold, where the second threshold is less than the first threshold; and reducing the duty cycle of the control signal from the second predetermined duty cycle to a third predetermined duty cycle by the control module when the detected voltage is less than a third threshold, where the third threshold is less than the second threshold. Thus, the power will not be drawn immediately or suddenly due to the high-power consumption of the load, thereby avoiding affecting the use of electrical devices due to too fast or too intense power fetching, for example, causing flickering of the lighting device.

According to the method of controlling the power fetching system for the no neutral switch according to the present invention, the gradually adjusting the duty cycle of the control signal includes gradually reducing the duty cycle of the control signal by a predetermined amount. A smooth change in the duty cycle can be achieved by setting a small predetermined amount of change.

According to another aspect of the present invention, the present invention further provides a storage medium. The storage medium includes a stored program. A device in which the storage medium is located is controlled to perform the method as described above while the program is running.

According to another aspect of the present invention, the present invention further provides a processor. The processor is configured to run a program. The method as described above is performed while the program is running.

According to another aspect of the present invention, the present invention further provides a computer program product. The computer program product is tangibly stored on a computer readable medium and includes computer executable instructions, and the computer executable instructions, when executed, cause at least one processor to perform the method as described above.

