Zero-delay anti-interference electricity protection module

Abstract

The utility model provides a zero-delay anti-interference electricity protection module, and belongs to the technical field of power distribution automation. The zero-delay anti-interference electricity protection module comprises a first switch, a first power supply, a coil current detection circuit and a controller, the first end of the first switch is used for being connected with network voltage, the second end of the first switch is used for being connected with a coil of a load switch, and the first power supply is connected with the first switch in parallel; the coil current detection circuit is used for detecting the coil current of the load switch, the output end of the coil current detection circuit and the control end of the first switch are both connected with the controller, and the controller is configured to control the first switch to be switched off when it is detected that the coil current of the load switch is larger than or equal to a current set value. The problem that an existing anti-interference electricity module is delayed and influences the anti-interference electricity effect can be solved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of power distribution automation, and in particular to a zero-delay anti-power sway protection module. Background Art

[0002] The anti-power sway module is an electronic device specially designed to resist power grid voltage fluctuations (commonly known as "power sway"). Its main function is to keep the load switch on through specific circuit design and component selection when voltage fluctuations occur in the circuit, thereby protecting the connected electronic equipment from the influence of voltage fluctuations and ensuring its normal operation.

[0003] The existing anti-power-swing module realizes the anti-power-swing function by adding a switching switch and a bypass power supply. Specifically, when the grid voltage is normal, the grid voltage keeps the coil of the load switch energized to keep the load switch turned on. When the grid voltage fluctuates, the switching switch controls the grid voltage to be disconnected, and the bypass power supply keeps the coil of the load switch turned on, thereby preventing the load switch from being disconnected when the grid voltage fluctuates. Due to the delay in the switching process, the bypass power supply may fail to supply power to the coil of the load switch in time, causing the load switch to be disconnected. Utility Model Content

[0004] The disclosed embodiment provides a zero-delay anti-power-shaking protection module to solve the problem that the existing anti-power-shaking modules have delays and affect the anti-power-shaking effect.

[0005] The embodiment of the present disclosure provides a zero-delay anti-power-shaking protection module, including a first switch, a first power supply, a coil current detection circuit and a controller.

[0006] The first end of the first switch is used to connect to the grid voltage, the second end of the first switch is used to connect to the coil of the load switch, and the first power supply is connected in parallel with the first switch;

[0007] The coil current detection circuit is used to detect the coil current of the load switch. The output end of the coil current detection circuit and the control end of the first switch are both connected to the controller. The controller is configured to control the first switch to disconnect when it is detected that the coil current of the load switch is greater than or equal to the current setting value.

[0008] In an exemplary embodiment of the present disclosure, the output voltage of the first power supply is lower than the grid voltage.

[0009] In an exemplary embodiment of the present disclosure, the zero-delay anti-power-sway protection module further includes a timing switch and a grid voltage detection circuit.

[0010] The timing switch is arranged between the output end of the first power supply and the coil of the load switch.

[0011] The output end of the grid voltage detection circuit and the control end of the timing switch are both connected to the controller.

[0012] The grid voltage detection circuit is used to detect grid voltage fluctuations, and the controller is also used to start the timing switch when grid voltage fluctuations are detected, or to close the timing switch when the grid voltage is normal.

[0013] In an exemplary embodiment of the present disclosure, the zero-delay anti-power swing protection module also includes a coil impedance detection circuit, which is used to detect the coil impedance of the load switch. The output end of the coil impedance detection circuit is connected to the controller, and the controller is configured to adjust the output voltage of the first power supply according to the size of the coil impedance of the load switch.

[0014] In an exemplary embodiment of the present disclosure, the first power supply includes an energy storage capacitor and a switching power supply.

[0015] The first end of the energy storage capacitor is the input end of the first power supply, the output end of the energy storage capacitor is connected to the input end of the switching power supply, and the output end of the switching power supply is the output end of the first power supply.

[0016] In an exemplary embodiment of the present disclosure, a rectifier circuit is connected between the grid voltage and the first end of the first switch.

[0017] In an exemplary embodiment of the present disclosure, the timing switch includes a timer and a second switch.

[0018] The control end of the timer is the control end of the timing switch, the output end of the timer is connected to the control end of the second switch, the first end of the first switch is connected to the output end of the switching power supply, and the second end of the first switch is connected to the coil of the load switch.

[0019] The beneficial effects of a zero-delay anti-power-shaking protection module provided by the embodiment of the present disclosure are:

[0020] In this embodiment, when the load is not working, no current flows through the coil of the load switch, and the grid voltage and the first power supply remain in a hot standby state; when the load is powered on, the grid voltage provides an operating voltage for the load switch, and the load switch is turned on. After the load switch is turned on (that is, when the coil current detection circuit detects that the coil current of the load switch is greater than the current setting value), it is only necessary to provide a smaller holding voltage for the coil of the load switch to keep the load switch turned on. At this time, the grid voltage can be disconnected, and the first power supply provides a holding voltage for the load switch, thereby avoiding the load switch being disconnected due to grid voltage fluctuations.

[0021] The anti-power-shaking module of this embodiment does not have a switching delay between the grid voltage power supply and the first power supply power supply, thereby ensuring the anti-power-shaking effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 It is a structural schematic diagram of a zero-delay anti-power shaking protection module provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0024] In order to enable people in the technical field to better understand the present solution, the technical solution in the embodiment of the present solution will be clearly described below in conjunction with the drawings in the embodiment of the present solution. Obviously, the described embodiment is an embodiment of a part of the present solution, not all of the embodiments. Based on the embodiments in the present solution, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present solution.

[0025] The term "including" and any other variations in the specification and claims of this solution and the above drawings mean "including but not limited to", and is intended to cover non-exclusive inclusions and is not limited to the examples listed in the text. In addition, the terms "first" and "second" are used to distinguish different objects, not to describe a specific order.

[0026] The following is a detailed description of the implementation of the present disclosure in conjunction with the specific drawings:

[0027] Figure 1 This is a schematic diagram of the structure of a zero-delay anti-power-shaking protection module provided by an embodiment of the present disclosure. Figure 1 The zero-delay anti-power-sway protection module is used to keep the load switch in the on state when the grid voltage fluctuates, and includes a first switch, a first power supply, a coil current detection circuit and a controller.

[0028] The first end of the first switch is used to connect to the grid voltage, the second end of the first switch is used to connect to the coil of the load switch, and the first power supply is connected in parallel with the first switch;

[0029] The coil current detection circuit is used to detect the coil current of the load switch. The output end of the coil current detection circuit and the control end of the first switch are both connected to the controller. The controller is configured to control the first switch to disconnect when it is detected that the coil current of the load switch is greater than or equal to the current setting value.

[0030] In this embodiment, the load switch may include a contactor, a relay, an air switch, a circuit breaker, etc., which is used to control the connection or disconnection of the load and the power supply in the circuit. The first switch may include a switch device such as a contactor, a relay (including a solid-state relay), and the controller can control the conduction or disconnection of the first switch by outputting a control signal to the control end of the first switch.

[0031] A start / stop button can be set in the load circuit, and the user can control the load to start or stop working by operating the start / stop button.

[0032] The first switch is a normally closed switch. When the load is not working, no current flows through the coil of the load switch, and the grid voltage and the first power supply remain in a hot standby state. When the load is powered on, the grid voltage provides an operating voltage for the load switch, and the load switch is turned on. After the load switch is turned on (that is, when the coil current detection circuit detects that the coil current of the load switch is greater than the current setting value), only a small holding voltage needs to be provided for the coil of the load switch to keep the load switch turned on. At this time, the grid voltage can be disconnected, and the first power supply provides a holding voltage for the load switch, thereby avoiding the disconnection of the load switch due to grid voltage fluctuations.

[0033] The anti-power-swing module of this embodiment does not have a switching delay between the grid voltage power supply and the first power supply power supply, thereby ensuring the anti-power-swing effect. At the same time, the voltage of the first power supply is lower than the grid voltage, and the on state of the load switch is maintained at a lower voltage, which is beneficial to reducing the power consumption of the load switch.

[0034] In an exemplary embodiment of the present disclosure, the output voltage of the first power supply is lower than the grid voltage.

[0035] In this embodiment, the voltage of the first power supply is lower than the grid voltage, and the load switch is kept in the on state with a lower voltage, which is beneficial to reducing the power consumption of the load switch.

[0036] In an exemplary embodiment of the present disclosure, a zero-delay anti-power-sway protection module further includes a timing switch and a grid voltage detection circuit.

[0037] The timing switch is arranged between the output terminal of the first power supply and the coil of the load switch.

[0038] The output end of the grid voltage detection circuit and the control end of the timing switch are both connected to the controller.

[0039] The grid voltage detection circuit is used to detect grid voltage fluctuations. The controller is also used to start the timing switch when the grid voltage fluctuations are detected, or to close the timing switch when the grid voltage is normal.

[0040] In this embodiment, the voltage detection module is used to detect the grid voltage in real time. When it is detected that the error between the grid voltage and the set voltage is greater than the error setting value, it is determined that a voltage fluctuation has occurred. At this time, the controller starts the timing switch. If the grid voltage returns to normal within the set time, the controller turns off the timing switch. Otherwise, when the set time is reached, the first power supply stops supplying power to the coil of the load switch to avoid the load switch remaining closed when the grid voltage is disconnected (not the grid voltage fluctuates).

[0041] In an exemplary embodiment of the present disclosure, a coil impedance detection circuit is also included, which is used to detect the coil impedance of the load switch. The output end of the coil impedance detection circuit is connected to the controller, and the controller is configured to adjust the output voltage of the first power supply according to the size of the coil impedance of the load switch.

[0042] In this embodiment, the coil impedance detection circuit can detect the coil impedance of the load switch by detecting the voltage at both ends of the coil and the current flowing through the coil. Considering that different load switches have different coil impedances and different requirements for on-current, if a certain load switch requires a relatively large on-current, the first power supply needs to output a relatively high output voltage. On the contrary, if a certain load switch requires a relatively small on-current, the first power supply can output a relatively low output voltage to avoid wasting electric energy.

[0043] Therefore, this embodiment detects the coil impedance and adjusts the output voltage of the first power supply according to the coil impedance, so that the output voltage of the first power supply can adapt to the needs of different load switches, and further reduce power loss on the basis of ensuring reliable conduction of the load switch.

[0044] Among them, the switching power supply usually includes a transformer and a switching tube. The output voltage of the switching power supply can be adjusted by adjusting the tap of the transformer or adjusting the conduction time of the switching tube, which is not limited here.

[0045] In an exemplary embodiment of the present disclosure, the first power supply includes an energy storage capacitor and a switching power supply.

[0046] The first end of the energy storage capacitor is the input end of the first power supply, the output end of the energy storage capacitor is connected to the input end of the switching power supply, and the output end of the switching power supply is the output end of the first power supply.

[0047] In this embodiment, the first power supply can be implemented by a general AC power supply or a DC power supply. In this embodiment, a storage capacitor is used in combination with a switching power supply. The storage capacitor is used to convert grid power into DC power for storage. The storage capacitor outputs a DC voltage to the input end of the switching power supply. The switching power supply can convert the DC voltage output by the storage capacitor into a DC voltage of a set level.

[0048] This embodiment uses a combination of energy storage capacitors and switching power supplies to achieve the function of the first power supply, which has stable operation, high efficiency, small size and light weight.

[0049] In an exemplary embodiment of the present disclosure, a rectifier circuit is connected between the grid voltage and the first end of the first switch.

[0050] In this embodiment, the rectifier circuit can convert the AC grid voltage into a higher-level DC voltage, providing a higher driving voltage for the load switch when the load is powered on, which is conducive to the rapid closing of the load switch.

[0051] Among them, the rectifier circuit can be implemented by a half-wave rectifier circuit, a full-wave rectifier circuit, etc., which is not limited here.

[0052] In an exemplary embodiment of the present disclosure, the timing switch includes a timer and a second switch.

[0053] The control end of the timer is the control end of the timing switch, the output end of the timer is connected to the control end of the second switch, the first end of the first switch is connected to the output end of the switching power supply, and the second end of the first switch is connected to the coil of the load switch.

[0054] In this embodiment, the timer can be implemented by combining a timer with a second switch. The timer can be a software timer or a hardware timer. The second switch can be a switch device such as a contactor, a relay (including a solid-state relay), etc.

[0055] When a software timer is used, the timing can be performed by the timer inside the controller. When it is detected that the error between the grid voltage and the set voltage is greater than the error setting value, the timer inside the controller starts the timing. If the grid voltage returns to normal within the set time (the set time can be 3s), the controller turns off the timing switch. Otherwise, when the set time is reached, the timer controls the second switch to disconnect and the first power supply stops outputting.

[0056] When a hardware timer is used, it can be implemented by a 555 timer, a CD4541 timer, etc. commonly used in the art. When it is detected that the error between the grid voltage and the set voltage is greater than the error setting value, the controller outputs a control signal to the hardware timer, and the hardware timer starts. If the grid voltage returns to normal within the set time, the controller turns off the timing switch. Otherwise, when the set time is reached, the hardware timer controls the second switch to disconnect, and the first power supply stops outputting.

[0057] The above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A zero-delay anti-power-shaking protection module, characterized in that: It includes a first switch, a first power supply, a coil current detection circuit and a controller, The first end of the first switch is used to connect to the grid voltage, the second end of the first switch is used to connect to the coil of the load switch, and the first power supply is connected in parallel with the first switch; The coil current detection circuit is used to detect the coil current of the load switch. The output end of the coil current detection circuit and the control end of the first switch are both connected to the controller. The controller is configured to control the first switch to disconnect when it is detected that the coil current of the load switch is greater than or equal to the current setting value.

2. A zero-delay anti-power-shaking protection module as claimed in claim 1, characterized in that: The output voltage of the first power supply is lower than the grid voltage.

3. A zero-delay anti-power-shaking protection module as claimed in claim 1, characterized in that: It also includes a timing switch and a grid voltage detection circuit. The timing switch is arranged between the output end of the first power supply and the coil of the load switch. The output end of the grid voltage detection circuit and the control end of the timing switch are both connected to the controller. The grid voltage detection circuit is used to detect grid voltage fluctuations, and the controller is configured to start the timing switch when grid voltage fluctuations are detected, or to close the timing switch when the grid voltage is normal.

4. A zero-delay anti-power-shaking protection module as claimed in claim 1, characterized in that: It also includes a coil impedance detection circuit, which is used to detect the coil impedance of the load switch. The output end of the coil impedance detection circuit is connected to the controller, and the controller is configured to adjust the output voltage of the first power supply according to the size of the coil impedance of the load switch.

5. A zero-delay anti-power-shaking protection module as claimed in claim 3, characterized in that: The first power supply includes a storage capacitor and a switching power supply, The first end of the energy storage capacitor is the input end of the first power supply, the output end of the energy storage capacitor is connected to the input end of the switching power supply, and the output end of the switching power supply is the output end of the first power supply.

6. A zero-delay anti-power-shaking protection module as claimed in claim 1, characterized in that: A rectifier circuit is connected between the grid voltage and the first end of the first switch.

7. A zero-delay anti-power-shaking protection module as claimed in claim 5, characterized in that: The timing switch comprises a timer and a second switch, The control end of the timer is the control end of the timing switch, the output end of the timer is connected to the control end of the second switch, the first end of the first switch is connected to the output end of the switching power supply, and the second end of the first switch is connected to the coil of the load switch.

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