Electric operation mechanism in power distribution system

Abstract

The utility model relates to an electric operating mechanism in a power distribution system, which is characterized by comprising a rectifying circuit connected to an alternating current power supply and configured to convert alternating current power into direct current power and provide the direct current power to a low-voltage motor; the low-voltage motor is connected to the rectifying circuit and is configured to execute forward rotation operation or reverse rotation operation under the control of the control circuit; and the control circuit is configured to receive the state feedback of the electric operation mechanism and control the start-stop and / or rotation direction of the low-voltage motor based on the state feedback. According to the embodiment of the utility model, a switching power supply is omitted, and the low-voltage motor is used for replacing an ultra-low-voltage motor, so that the output power of the electric operator can be improved in a limited space.

Description

Technical Field

[0001] This utility model relates to an electric operating mechanism in a power distribution system, and more specifically, to a universal AC / DC electric operating mechanism. Background Technology

[0002] Electrically operated mechanisms are typically used with circuit breakers. After installation, users can remotely operate the circuit breaker by pressing buttons, and it also enables some automated operation requirements.

[0003] The core component of an electric control system is the motor. In existing technology, the motor is driven by a switching power supply and rotates in one direction only. Due to the efficiency issues of switching power supplies and the unidirectional rotation, the motor occupies a large amount of space, thus limiting the output power of the electric control system.

[0004] Therefore, it is necessary to improve the space utilization and output power of the electric control system. Utility Model Content

[0005] This utility model relates to an electric operating mechanism in a power distribution system, characterized in that it includes: a rectifier circuit connected to an AC power source and configured to convert AC power into DC power and supply it to a low-voltage motor; a low-voltage motor connected to the rectifier circuit and configured to perform forward or reverse rotation under the control of a control circuit; and a control circuit configured to receive status feedback from the electric operating mechanism and control the start / stop and / or rotation direction of the low-voltage motor based on the status feedback.

[0006] In one example, the rotation direction of the low-voltage motor includes forward and reverse rotation, and the electric operating mechanism performs reciprocating motion by switching the rotation direction of the low-voltage motor.

[0007] In one example, the DC power converted by the rectifier circuit is directly supplied to the low-voltage motor, and the low-voltage motor operates at 220V or 380V.

[0008] In one example, the status feedback includes at least one of a trip status signal, a closing / opening status signal, and a manual / automatic status signal.

[0009] In one example, the control circuit is also configured to control the start-stop and / or rotation direction of the low-voltage motor based on remote opening and closing control signals and the status feedback.

[0010] In one example, the rotation direction of the low-voltage motor is switched by a double-pole double-throw relay.

[0011] In one example, the electric control mechanism further includes a soft-start circuit connected between the rectifier circuit and the low-voltage motor, configured to start the low-voltage motor in two stages.

[0012] In one example, the soft-start circuit includes: a first path comprising a resistor and a first switch, a first end of the resistor being connected to a rectifier circuit and a second end being connected to the first switch, the first switch being connected between the resistor and the low-voltage motor; and a second path comprising a second switch connected between the rectifier circuit and the low-voltage motor.

[0013] In one example, in the first phase, the first switch is closed for a predetermined time period, the second switch is open, and in the second phase, the second switch is closed.

[0014] In one example, the control circuit is also configured to control the closing and opening of the first and second switches.

[0015] Therefore, according to the embodiments of this utility model, the switching power supply is eliminated, and the extra-low voltage motor is replaced with a low-voltage motor, which can increase the output power of the electric motor in a limited space. Attached Figure Description

[0016] The above and other aspects, features, and advantages of specific embodiments of the present invention will become clearer from the following description taken in conjunction with the accompanying drawings, in which:

[0017] Figure 1 This is a schematic block diagram illustrating an electric operating mechanism according to the prior art;

[0018] Figure 2 This is a schematic block diagram showing the electric operating mechanism according to an embodiment of the present utility model;

[0019] Figure 3 A schematic view showing a more detailed structure of the electric operating mechanism according to an embodiment of the present invention;

[0020] Figure 4 A diagram showing a schematic connection between a rectifier circuit and a low-voltage motor according to another embodiment of the present invention;

[0021] Figure 5 A diagram showing a specific schematic connection between a rectifier circuit and a low-voltage motor according to another embodiment of the present invention is provided; and

[0022] Figure 6 A signal diagram for soft start according to another embodiment of the present invention is shown. Detailed Implementation

[0023] Before proceeding with the detailed description below, it may be advantageous to define certain words and phrases used throughout this invention. The terms “comprising” and “including” and their derivatives mean, but are not limited to, any of the following. The term “controller” or “control unit” means any device, system, or part thereof that controls at least one operation. Such a controller may be implemented in hardware, or a combination of hardware and software and / or firmware. For example, a controller may include, for instance, an application-specific integrated circuit (ASIC), a general-purpose or special-purpose central processing unit (CPU), a digital signal processor (DSP), and programmable logic devices such as a field-programmable gate array (FPGA). A controller may be manufactured as a single printed circuit board (PCB) or distributed across several interconnected PCBs. A controller may include other processing circuitry; for example, a controller may include two processing circuits such as an FPGA and a CPU interconnected on a PCB. The functionality associated with any particular controller may be centralized or distributed, either local or remote. The phrase “at least one,” when used with a list of items, means that different combinations of one or more of the listed items may be used, and perhaps only one item from the list is required. For example, "at least one of A, B, and C" includes any one of the following combinations: A, B, C, A and B, A and C, B and C, A and B and C. Furthermore, in the description of this utility model, the terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance or order. In embodiments of this disclosure, unless otherwise expressly stated, "connection" does not necessarily mean "direct connection" or "direct contact," but only requires electrical connection.

[0024] Definitions of other specific words and phrases are provided throughout this invention. Those skilled in the art will understand that, in many, if not most, cases, such definitions apply to the prior and future use of the words and phrases thus defined.

[0025] The various embodiments of the present invention described below with reference to the accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of the present invention in any way. Those skilled in the art will understand that the principles of the present invention can be implemented in any suitably arranged system or device. In some cases, the actions described in the present invention can be performed in different orders and still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require the specific order or sequential sequence shown to achieve the desired result. In certain embodiments, multitasking and parallel processing may be advantageous.

[0026] The text and accompanying drawings are provided by way of example only to aid in understanding the present invention. They should not be construed as limiting the scope of the appended claims in any way. Although certain embodiments and examples have been provided, it will be clear to those skilled in the art, based on the content of the present invention, that changes can be made to the illustrated embodiments and examples without departing from the scope of the present invention.

[0027] Therefore, in this specification, the terms "electric operation" and "electric operation mechanism" may be used interchangeably.

[0028] Figure 1 This is a schematic block diagram illustrating an electric operating mechanism according to the prior art.

[0029] like Figure 1 As shown, in existing electric operating mechanisms, the input voltage is rectified from AC power to DC power, and then converted to extra-low voltage (e.g., 24V) by a switching power supply before being supplied to an extra-low voltage motor. The extra-low voltage motor is driven by the switching power supply and rotates in one direction. Due to the efficiency issues of the switching power supply and the unidirectional rotation, it occupies a significant amount of space within the electric operating mechanism, thus limiting its output power.

[0030] Figure 2 This is a schematic block diagram showing an electric operating mechanism 200 according to an embodiment of the present invention.

[0031] like Figure 2 As shown, the electric operating mechanism 200 may include a rectifier circuit 201, a low-voltage motor 202, and a control circuit 203.

[0032] The rectifier circuit 201 can be connected to an AC power source and configured to convert AC power into DC power and supply it to the low-voltage motor 202. The low-voltage motor 202 can be connected to the rectifier circuit 201 and configured to perform forward or reverse rotation under the control of the control circuit 203. The control circuit 203 can be configured to receive status feedback from the electric operating mechanism and control the start / stop and / or rotation direction of the low-voltage motor 202 based on the status feedback.

[0033] In existing technologies, a switching power supply is necessary because of the use of extra-low voltage motors. However, switching power supplies typically waste about 15% of power and take up space. The operating voltage of extra-low voltage motors is usually below 50V, such as 24V.

[0034] Therefore, according to the embodiments of this utility model, the switching power supply is eliminated, and the extra-low voltage motor is replaced with a low-voltage motor, which can increase the output power of the electric motor in a limited space.

[0035] The input voltage is rectified by the rectifier circuit, and the converted DC power drives the low-voltage motor, which in turn drives the electric operating mechanism.

[0036] According to the embodiments of the present invention, the rotation direction of the low-voltage motor 202 may include forward rotation and reverse rotation, and by switching the rotation direction of the low-voltage motor 202, the electric motor can perform reciprocating motion instead of unidirectional rotation.

[0037] According to an embodiment of the present invention, and Figure 1 Unlike existing technologies, the DC power converted by the rectifier circuit is directly supplied to the low-voltage motor. Therefore, space can be saved.

[0038] The operating voltage of a low-voltage motor can be 220V or 380V.

[0039] like Figure 2 As shown, the control circuit 203 can also be configured to control the start and stop, i.e., start and stop and / or rotation direction of the low-voltage motor 202 based on remote opening and closing control signals and status feedback.

[0040] Figure 3 A schematic view showing a more detailed structure of the electric operating mechanism according to an embodiment of the present invention is provided.

[0041] like Figure 3 As shown, the status feedback may include at least one of the following: trip status signal, on / off status signal, and manual / automatic status signal.

[0042] Furthermore, the rotation direction of the low-voltage motor 202 can be switched using a double-pole double-throw relay. For example, the polarity of the low-voltage motor 202 can be switched by changing the connection with the contacts using a double-pole double-throw relay, thereby changing the rotation direction of the low-voltage motor 202 and driving the electric reciprocating motion.

[0043] Therefore, according to this embodiment of the invention, the low-voltage motor can operate in both forward and reverse directions, and the electric motor can reciprocate. The motor is directly driven by the rectified power input. This improves space utilization and provides higher output power within a limited space.

[0044] Figure 4 A diagram showing a schematic connection between a rectifier circuit and a low-voltage motor according to another embodiment of the present invention is provided.

[0045] like Figure 4 As shown, the electric operating mechanism according to an embodiment of the present invention may further include a soft-start circuit connected between the rectifier circuit and the low-voltage motor, configured to start the low-voltage motor in two stages.

[0046] For the sake of simplicity, Figure 4 The circuit shown is only a part of the electric operating mechanism, and the rectifier circuit and low-voltage motor can be similar to... Figure 2 The rectifier circuit 201 and the low-voltage motor 202 are shown in the figure.

[0047] The soft-start circuit may include: a first path comprising a resistor R and a first switch S1, wherein a first end of the resistor R is connected to a rectifier circuit and a second end is connected to the first switch, and the first switch S1 is connected between the resistor R and the low-voltage motor; and a second path comprising a second switch S2 connected between the rectifier circuit and the low-voltage motor.

[0048] The first path and the second path are connected in parallel.

[0049] When the low-voltage motor is started, in the first stage, the first switch S1 is closed for a predetermined time period, the second switch S2 is opened, and then in the second stage, the second switch S2 is closed.

[0050] According to the example of this utility model, the closing and opening of the first switch S1 and the second switch S2 are controlled by the control circuit 203.

[0051] Figure 5 A diagram showing a specific schematic connection between a rectifier circuit and a low-voltage motor according to another embodiment of the present invention is provided. Figure 6 A signal diagram for soft start according to another embodiment of the present invention is shown.

[0052] like Figure 5 and Figure 6 As shown, in the first stage, the first switch S1 is closed for a predetermined time period t, which is, for example, 40 ms. During this stage, the magnitude of the excitation current is limited by a resistor; this is the first excitation current.

[0053] Then, after the first switch S1 has been closed for a predetermined time period t, the second switch S2 is closed, at which point a second excitation current is generated. Afterwards, the motor is allowed to operate at full power.

[0054] The time when the first switch S1 is closed and the time when the second switch S2 is closed can overlap, for example, 5ms.

[0055] In one example, when the motor is started directly, its peak power may reach 1200W, while according to the embodiment of the present invention, the peak power can be 1200W when a soft start method is used.

[0056] Compared to direct starting without a soft-start circuit, according to the embodiments of this invention, by effectively selecting the resistor R and the predetermined time period t, the starting power can be limited to a controllable range. Furthermore, a faster electrical switching time can be provided within the same volume as conventional solutions.

[0057] Although the present invention has been described with reference to exemplary embodiments, various changes and modifications may be suggested to those skilled in the art. The present invention is intended to cover such changes and modifications that fall within the scope of the appended claims.

[0058] Any description in this invention should not be construed as implying that any particular element, step, or function is an essential element that must be included within the scope of the claims. The scope of the patent subject matter is defined only by the claims.

Claims

1. An electric operating mechanism in a power distribution system, characterized in that, include: A rectifier circuit, connected to an AC power source, is configured to convert AC power into DC power and supply it to a low-voltage motor. A low-voltage motor is connected to a rectifier circuit and configured to perform forward or reverse operation under the control of a control circuit. as well as The control circuit is configured to receive status feedback from the electric operating mechanism and control the start, stop and / or rotation direction of the low-voltage motor based on the status feedback.

2. The electric operating mechanism according to claim 1, characterized in that, The low-voltage motor can rotate in both forward and reverse directions, and the electric control mechanism performs reciprocating motion by switching the rotation direction of the low-voltage motor.

3. The electric operating mechanism according to claim 1, characterized in that, The DC power converted by the rectifier circuit is directly supplied to the low-voltage motor, and the operating voltage of the low-voltage motor is 220V or 380V.

4. The electric operating mechanism according to claim 1, characterized in that, The status feedback includes at least one of the following: trip status signal, closing / opening status signal, and manual / automatic status signal.

5. The electric operating mechanism according to claim 1, characterized in that, The control circuit is also configured to control the start-stop and / or rotation direction of the low-voltage motor based on remote opening and closing control signals and the status feedback.

6. The electric operating mechanism according to claim 2, characterized in that, The rotation direction of the low-voltage motor is switched by a double-pole double-throw relay.

7. The electric operating mechanism according to claim 1, characterized in that, Also includes: The soft-start circuit, connected between the rectifier circuit and the low-voltage motor, is configured to start the low-voltage motor in two stages.

8. The electric operating mechanism according to claim 7, characterized in that, The soft-start circuit includes: A first path includes a resistor and a first switch. A first end of the resistor is connected to a rectifier circuit, and a second end is connected to the first switch. The first switch is connected between the resistor and a low-voltage motor. The second path includes a second switch connected between the rectifier circuit and the low-voltage motor.

9. The electric operating mechanism according to claim 8, characterized in that, In the first phase, the first switch is closed for a predetermined time period, the second switch is opened, and In the second stage, the second switch is closed.

10. The electric operating mechanism according to claim 9, characterized in that, The control circuit is also configured to control the closing and opening of the first switch and the second switch.

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