Signal detection device for surge protector and surge protector
By employing a signal detection device consisting of a series acquisition coil and an AC-DC conversion module in the surge protector, the problem of insufficient sensitivity of traditional surge protectors in detecting 10/350μs waveforms is solved, enabling timely early warning and counting functions.
Patent Information
- Application Number
- CN202422922923.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-28
- Publication Date
- 2026-01-30
- Estimated Expiration
- 2034-11-28
AI Technical Summary
Traditional surge protectors have insufficient sensitivity when detecting 10/350μs waveforms, leading to problems such as late warnings or late counting.
A signal detection device employs at least two acquisition coils connected in series. It generates voltage by sensing changes in the current of the acquisition coils, and uses an AC-DC conversion module and a detection capacitor to stabilize the voltage. Combined with a voltage detection interface and a microcontroller unit, it performs early warning or counting operations.
It improves the detection sensitivity of 10/350μs waveforms, ensuring timely warning or counting when faced with the same current peak value, and avoiding late warning or late counting.
Smart Images
Figure CN223857296U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] Example embodiments of the present disclosure generally relate to electrical devices, and in particular, to a signal detection device for a surge protector and a surge protector. BACKGROUND
[0002] A surge protector is an electrical device that protects equipment from the damaging effects of transient voltages (surges) caused by lightning, utility switching operations, static electricity, etc. in an electrical system.
[0003] When a surge voltage occurs, the surge protector can detect the surge voltage and act (e.g., be broken down, etc.) in a very short time. In this way, the voltage across the electrical equipment connected within its protection range can be limited, ensuring that the voltage borne by the equipment is within a safe range. In turn, the electrical equipment can operate normally and stably. SUMMARY
[0004] In a first aspect of the present disclosure, a signal detection device for a surge protector is provided. The signal detection device includes: an acquisition assembly coupled to a target line, adapted to acquire a surge signal in the target line, the acquisition assembly including: at least two acquisition coils, the at least two acquisition coils being connected in series, and the at least two acquisition coils being arranged in a radial direction perpendicular to an axis of the target line and extending at least partially along a circumferential direction of the target line; a charging capacitor coupled to the acquisition assembly at both ends, adapted to be charged by the acquisition assembly during a fluctuation of a current of the target line; an AC-DC conversion module connected in parallel to the charging capacitor, and adapted to convert an AC voltage output by the charging capacitor into a DC voltage; a detection capacitor coupled to the AC-DC conversion module, adapted to be charged by the AC-DC conversion module; and a pair of voltage detection interfaces coupled to both ends of the detection capacitor, respectively, and adapted to detect a voltage across the detection capacitor.
[0005] In some embodiments, the at least two acquisition coils include two acquisition coils, the two acquisition coils being arranged on opposite sides of the target line, and the two acquisition coils having opposite rotation directions.
[0006] In some embodiments, each of the at least two acquisition coils is a Rogowski coil.
[0007] In some embodiments, the signal acquisition device further includes: a semiconductor switch coupled across the detection capacitor.
[0008] In some embodiments, the semiconductor switch includes: a metal-oxide-semiconductor field-effect transistor, a source and a drain of the metal-oxide-semiconductor field-effect transistor being coupled to both ends of the detection capacitor, respectively.
[0009] In some embodiments, the signal acquisition device further comprises a current-limiting resistor arranged between the acquisition assembly and the charging capacitor and coupled in series to the charging capacitor.
[0010] In some embodiments, the signal acquisition device further comprises a protection diode coupled in parallel to the detection capacitor and adapted to be broken down during a period when the voltage across the detection capacitor is greater than a predetermined threshold.
[0011] In some embodiments, the protection diode is a Zener diode.
[0012] In some embodiments, the signal detection device further comprises an analog-to-digital converter (ADC) coupled to the pair of voltage detection interfaces and adapted to acquire the acquired voltage signals of the pair of voltage detection interfaces.
[0013] According to embodiments of the present disclosure, the current variation in the target line is acquired by at least two acquisition coils of the acquisition assembly, and a voltage is generated when the current in the target line varies to charge the charging capacitor. After the voltage across the charging capacitor is higher than a predetermined voltage drop of the AC-DC conversion module, the charging capacitor charges the detection capacitor via the AC-DC conversion module. Since the detection capacitor has no discharge circuit, the voltage of the detection capacitor can be maintained in a stable range after being charged. In turn, the voltage across the detection capacitor can be acquired by the pair of voltage detection interfaces, and a pre-warning (or counting) operation can be performed according to the comparison between the voltage across the detection capacitor and a pre-warning (or counting) threshold. In this way, the signal detection device can accurately acquire the surge signal in the target line, and can also improve the sensitivity of the waveform detection for 10 / 350 μs.
[0014] In a second aspect of the present disclosure, a surge protector is provided. The surge protector comprises the signal acquisition device according to the first aspect of the present disclosure.
[0015] It should be understood that the content described in this section is not intended to limit the key features or important features of the embodiments of the present disclosure, nor to limit the scope of the present disclosure. Other features of the present disclosure will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS
[0016] The above and other features, advantages, and aspects of embodiments of the present disclosure will become more apparent upon consideration of the following detailed description, taken in conjunction with the accompanying drawings. In the drawings, like reference numerals refer to like elements, and in which:
[0017] Figure 1 a simple schematic diagram of a surge protector according to some embodiments of the present disclosure is shown; and
[0018] Figure 2A simplified circuit schematic of a surge protector is shown in accordance with some embodiments of the present disclosure. DETAILED DESCRIPTION
[0019] Embodiments of the present disclosure will be described in more detail with reference to the drawings. While certain embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be embodied in various forms and should not be interpreted as being limited to the embodiments set forth herein; rather, these embodiments are provided so that the present disclosure can be more thoroughly and completely understood. It is understood that the drawings of the present disclosure are for illustrative purposes only and are not intended to limit the scope of the present disclosure.
[0020] It is noted that the headings provided herein are not limitations of the various embodiments of the present disclosure. The various embodiments are described throughout this document and can be included under any heading. Additionally, embodiments described in any heading can be combined with any other embodiment described in the same heading and / or a different heading in any manner.
[0021] In the description of embodiments of the present disclosure, the term "including" and its derivatives, shall be understood as comprising but not limited to. The term "based on" shall be understood as "based, at least in part, on". The term "one embodiment" or "an embodiment" shall be understood as "at least one embodiment". The term "some embodiments" shall be understood as "at least some embodiments". Other explicit and implicit definitions can also be included below. The terms "first", "second", etc. can refer to different or the same objects. Other explicit and implicit definitions can also be included below.
[0022] As briefly mentioned earlier, the standard defined lightning strike mainly includes two forms, i.e. 8 / 20μs waveform and 10 / 350μs waveform, wherein for the 8 / 20μs waveform, the 8 represents the time from the beginning of the current to the current rising to the peak value is 8 microseconds, and the 20 represents the time from the beginning of the current to the current falling to half of the peak value is 20 microseconds. For the 10 / 350μs waveform, the 10 represents the time from the beginning of the current to the current rising to the peak value is 10 microseconds, and the 350 represents the time from the beginning of the current to the current falling to half of the peak value is 350 microseconds.
[0023] In the signal detection device of the conventional surge protector, the current change in the power line is sensed by the coil, and a voltage is generated to charge the capacitor. For the same current peak, the voltage generated by the signal detection device for the 8 / 20 μs waveform will be higher than that for the 10 / 350 μs waveform due to the different change speed of the two waveforms. For example, for a surge signal with a current peak of 1000 A, the voltage generated by the signal detection device for the 8 / 20 μs waveform is 0.8 V, and the voltage generated for the 10 / 350 μs waveform is 0.4 V. This also results in that the conventional signal detection device needs a higher peak current for the pre-alarm (or counting) for the 10 / 350 μs waveform. That is, in use, the conventional surge protector can have a late pre-alarm (or late counting) for the 10 / 350 μs waveform.
[0024] The signal detection device for a surge protector and the surge protector provided according to the present disclosure are to solve or at least partially solve the above-mentioned problems and other potential problems in the conventional solutions. According to some embodiments of the present disclosure, the signal detection device for a surge protector acquires the current change in the target line through at least two acquisition coils of an acquisition assembly, and generates a voltage to charge a charging capacitor when the current in the target line changes. After the voltage across the charging capacitor is higher than the predetermined voltage drop of the AC-DC conversion module, the charging capacitor charges a detection capacitor via the AC-DC conversion module. Since the detection capacitor has no discharge circuit, the voltage of the detection capacitor can be maintained in a stable range after the detection capacitor is charged. Then, the voltage across the detection capacitor can be acquired through a pair of voltage detection interfaces, and the pre-alarm (or counting) operation can be performed according to the comparison between the voltage across the detection capacitor and the pre-alarm (or counting) threshold. In this way, the signal detection device can accurately acquire the surge signal in the target line, and the sensitivity for the 10 / 350 μs waveform detection can be improved.
[0025] Figure 1 A simple schematic diagram of a surge protector according to some embodiments of the present disclosure is shown in FIG. 1. Figure 1 As shown in FIG. 1, the surge protector 10 generally includes a main body mechanism 12 and a signal detection device 1 coupled to the main body mechanism 12. The signal detection device is coupled to a target line 11 and is adapted to detect the current change in the target line 11 to send a pre-alarm to the main body mechanism 12 when a surge occurs in the target line 11. In addition, the signal detection device 1 can also count the number of times the surge protector 10 is struck by lightning, so that the user can check when needed.
[0026] Figure 2 A simple circuit schematic diagram of a surge protector according to some embodiments of the present disclosure is shown in FIG. 2. As shown in FIG. 2, Figure 2As shown, the surge protector 10 includes a data acquisition component, a charging capacitor 3 coupled to the data acquisition component, an AC-DC conversion module 4 connected in parallel to the charging capacitor 3, a detection capacitor 5 coupled to the AC-DC conversion module 4, and a pair of voltage detection interfaces 6.
[0027] The acquisition assembly includes at least two acquisition coils 2, each arranged radially on the target line 11 perpendicular to its axis, and each acquisition coil 2 is at least partially arranged circumferentially along the target line 11, thereby enabling the acquisition coil 2 to generate an induced voltage based on current changes in the target line 11. In some embodiments, the acquisition coil 2 may be bent at least partially circumferentially along the target line 11 to coincide with the circumferential direction of the target line 11; in other embodiments, the acquisition coil 2 may also be arranged to extend along a tangential direction associated with the circumferential direction of the target line 11. In some embodiments, the acquisition coil 2 may be a Rokowski coil.
[0028] At least two sampling coils 2 are connected in series, and the winding direction of the at least two sampling coils 2 is arranged to be continuous along the circumference of the target line 11 (e.g., clockwise). That is, during the current change in the target line 11, the current induced in the two sampling coils 2 is in the same direction (e.g., at least two induced currents generated by the at least two sampling coils are in the circumferential clockwise direction of the target line 11). In this way, the induced voltages generated by the at least two induction coils can be superimposed, thereby improving the charging efficiency of the charging capacitor 3.
[0029] In some embodiments, the acquisition component includes two acquisition coils 2, which are respectively arranged on opposite sides of the target line 11 in the radial direction, and the winding directions of the two acquisition coils 2 are opposite. In this way, when the current of the target line 11 changes, the two acquisition coils 2 can simultaneously induce currents in the same direction.
[0030] The two ends of the charging capacitor 3 are respectively coupled to the two ends of the acquisition component so that it is charged by the acquisition component when an induced current is sensed. In some embodiments, a current-limiting resistor 8 is also arranged between the charging capacitor 3 and the acquisition component, and the current-limiting resistor 8 is connected in series with the charging capacitor 3. Thus, the current-limiting resistor 8 can limit the charging current of the charging capacitor 3 and protect the charging capacitor 3.
[0031] The input of the AC-DC conversion module 4 is coupled to the charging capacitor 3, and the output of the AC-DC conversion module 4 is coupled to the detection capacitor 5. The AC-DC conversion module 4 can convert the AC current generated by the charging assembly during the surge of the target line 11 into DC current and charge the detection capacitor 5. The AC-DC conversion module 4 has a predetermined voltage drop (e.g., 1.4V) inside. During the change of the current of the target line 11, only when the target charger is charged to a voltage exceeding the predetermined voltage drop of the AC-DC conversion module 4, the charging capacitor 3 can charge the detection capacitor 5 through the AC-DC conversion module 4. That is, the AC-DC conversion module 4 can filter out the voltage lower than the predetermined voltage drop induced by the sampling assembly for the 8 / 20μs waveform or the 10 / 350μs waveform. In addition, since the two ends of the detection capacitor 5 are coupled to the output of the AC-DC conversion module 4, that is, the detection capacitor 5 has no discharge loop, the voltage of the detection capacitor 5 can be maintained. In turn, when facing the same peak current of the surge current, the signal detection device 1 can give an early warning for the 10 / 350μs waveform before the 8 / 20μs waveform.
[0032] In some specific embodiments, if the predetermined threshold of the surge protector 10 is 0.75V, for the 10 / 350μs waveform, the surge protector 10 can give an early warning around the peak current of 700A. For the 8 / 20μs waveform, the surge protector 10 can give an early warning around 900A.
[0033] A pair of voltage detection interfaces 6 are coupled to the two ends of the detection capacitor 5, so that the pair of voltage detection interfaces 6 can collect the voltage of the detection capacitor 5. In some embodiments, the signal detection device 1 further comprises an analog-to-digital converter (ADC) coupled to the pair of voltage detection interfaces 6 and adapted to obtain the voltage signal collected by the pair of voltage detection interfaces 6.
[0034] In some embodiments, the signal detection device 1 can further comprise a micro control unit, the analog-to-digital converter is coupled to the micro control unit, and the micro control unit can compare the voltage of the detection capacitor 5 with a preset threshold value after detecting the voltage of the detection capacitor 5. If the voltage of the detection capacitor 5 exceeds the preset threshold value, the micro control unit can give an early warning to control the related mechanism of the surge protector 10 to act, and the micro control unit can also count the surge situation of the target line 11 (i.e., count) for the user to refer to.
[0035] In some embodiments, the signal detection device 1 further comprises a semiconductor switch coupled between the two ends of the detection capacitor 5, and the semiconductor switch is adapted to be controlled and turned on, so that a closed loop is formed at the two ends of the detection capacitor 5, and the detection capacitor 5 is discharged. The signal detection device 1 is thus reset to continue detecting the surge situation of the target line 11.
[0036] In some embodiments, the semiconductor switch can be a metal oxide semiconductor field effect transistor 7 (MOSFET), the source (S) and drain (D) of which are coupled to the two terminals of the detection capacitor 5, respectively. The gate (G) of the metal oxide semiconductor field effect transistor 7 is coupled to the micro control unit. In this way, the micro control unit can control the signal detection device 1 reset by the metal oxide semiconductor field effect transistor 7.
[0037] In some embodiments, the two terminals of the detection capacitor 5 are also connected in parallel with a protection diode, which in some embodiments can be a Zener diode 9, which can be broken down during the detection capacitor 5 two terminals voltage is higher than a predetermined threshold. Thus, a closed loop is formed across the detection capacitor 5, the detection capacitor 5 is discharged. In this way, the signal detection device 1 is protected.
[0038] The implementations of the disclosure have been described above with the intent to be illustrative rather than limiting. Many modifications and enhancements are possible and within the scope of the implementations. Although exemplary implementations have been described in some detail, those skilled in the art will appreciate that various modifications are possible to the disclosed implementations without departing from the scope and spirit of the described implementations. The scope of the implementations described herein is to be limited only by the claims. Furthermore, it is to be understood that the use of certain terms to describe the implementations is used only to better communicate the understandings of the implementations to those of ordinary skill in the art, and such terms are by no means intended to limit the scope of the implementations described herein.
Claims
1. A signal detection device for a surge protector, characterized by, Comprising: a pickup assembly coupled to a target line (11) and adapted to pick up a surge signal in the target line (11), the pickup assembly comprising: at least two pickup coils (2) connected in series, and arranged in a radial direction of the target line (11) perpendicular to an axis of the target line (11) and extending at least partially along a circumferential direction of the target line (11); a charging capacitor (3) coupled to the pickup assembly at two ends thereof and adapted to be charged by the pickup assembly during a current fluctuation of the target line (11); an AC-DC conversion module (4) connected in parallel to the charging capacitor (3) and adapted to convert an AC voltage output by the charging capacitor (3) into a DC voltage; a detection capacitor (5) coupled to the AC-DC conversion module (4) and adapted to be charged by the AC-DC conversion module (4); and a pair of voltage detection interfaces (6) coupled to the two ends of the detection capacitor (5) respectively and adapted to detect a voltage across the detection capacitor (5).
2. The signal detection apparatus according to claim 1, characterized by The at least two pickup coils (2) comprise two pickup coils (2) arranged on opposite sides of the target line (11) and having opposite winding directions.
3. The signal detection apparatus according to claim 2, characterized by Each pickup coil (2) of the at least two pickup coils (2) is a Rogowski coil.
4. The signal detection apparatus according to claim 1, characterized by Further comprising: a semiconductor switch coupled across the detection capacitor (5).
5. The signal detection apparatus according to claim 4, characterized by The semiconductor switch comprises: a metal-oxide-semiconductor field-effect transistor (7) having a source and a drain coupled to the two ends of the detection capacitor (5) respectively.
6. The signal detection apparatus according to claim 1, wherein Further comprising: a current-limiting resistor (8) arranged between the pickup assembly and the charging capacitor (3) and coupled in series to the charging capacitor (3).
7. The signal detection apparatus according to claim 1, wherein Further comprising a protection diode connected in parallel to the two ends of the detection capacitor (5) and adapted to be broken down during a voltage across the detection capacitor (5) being greater than a predetermined threshold.
8. The signal detection apparatus according to claim 7, wherein The protection diode is a Zener diode (9).
9. The signal detection apparatus according to claim 1, wherein Further comprising an analog-to-digital converter coupled to the pair of voltage detection interfaces (6) and adapted to acquire a picked-up voltage signal of the pair of voltage detection interfaces (6).
10. A surge protector, characterized by, Comprising: the signal detection device (1) according to any one of claims 1-9.