Electric leakage protection device and method for dynamically adjusting driving signal

Abstract

The invention belongs to the technical field of electric leakage protection, and discloses an electric leakage protection device and method for dynamically adjusting a driving signal, and the device comprises an amplification module which is used for amplifying an electric leakage signal, obtaining an amplified signal, and transmitting the amplified signal to a comparison module; the comparison module is used for comparing the amplification signal with a preset electric leakage threshold value to obtain a comparison signal and sending the comparison signal to the filtering module; the filtering module is used for filtering the comparison signal to obtain a trigger signal and sending the trigger signal to the trigger module; the trigger module is used for generating a driving signal according to the trigger signal and sending the driving signal to the driving module; and the driving module is used for disconnecting the protection switch at the high level of the driving signal. According to the invention, the problem that the tripping action of the protection switch is not stable enough due to too short driving signals can be prevented, the thyristor and the protection switch are prevented from working for a long time due to too long driving, the probability of device burnout is reduced, and the service life is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of leakage protection, and particularly relates to a leakage protection device and method for dynamically adjusting a driving signal. Background Art

[0002] In the existing leakage protection device, after a comparator determines that a leakage signal exceeds a reference signal, a comparison signal generated is widened by a preset width to form a driving signal, thereby controlling a thyristor to disconnect a protection switch.

[0003] However, the driving signal formed in this way can only prevent the tripping action of the protection switch from being unstable due to too short a signal, but in actual applications, there will be a long-term leakage signal, resulting in an equally long driving signal obtained by corresponding widening. When the thyristor and the protection switch are working continuously for a long time, it is easy to burn out devices such as the protection switch or the thyristor. Summary of the Invention

[0004] The present application provides a leakage protection device and method for dynamically adjusting a driving signal, which can prevent the tripping action of the protection switch from being unstable due to too short a driving signal, and at the same time prevent the thyristor and the protection switch from working continuously for a long time caused by too long a driving signal.

[0005] In a first aspect, an embodiment of the present application provides a leakage protection device for dynamically adjusting a driving signal, including: An amplification module, configured to amplify a leakage signal to obtain an amplified signal and send it to a comparison module; A comparison module, configured to compare the amplified signal with a preset leakage threshold to obtain a comparison signal and send it to a filtering module; A filtering module, configured to filter the comparison signal to obtain a trigger signal and send it to a trigger module; A trigger module, configured to generate a driving signal according to the trigger signal and send it to a driving module; A driving module, configured to disconnect the protection switch at a high level of the driving signal.

[0006] Further, the trigger module is specifically configured to obtain a first duration and a second duration of the trigger signal; wherein, the first duration is the duration of any high level of the trigger signal, and the second duration is the sum of the durations of any two consecutive high levels of the trigger signal and the duration of the intermediate low level; generate a driving signal according to the first duration and the second duration.

[0007] Further, the trigger module is specifically configured to, when the first duration is less than a preset high-level threshold, send a first signal as the driving signal to the driving module; the first signal includes a high level with a duration of the preset high-level threshold.

[0008] Further, the trigger module is specifically further configured to, when the second duration is less than a preset period threshold, send the first signal to the driving module as a driving signal; wherein, the preset period threshold is equal to the sum of a preset high-level threshold and a preset low-level threshold.

[0009] Further, the trigger module is specifically further configured to, when the first duration or the second duration is less than 2 times the preset period threshold and greater than the preset period threshold, send the second signal to the driving module as a driving signal; the second signal includes two high-levels with a duration of the preset high-level threshold for each, and the low-level duration between the two high-levels is the preset low-level threshold.

[0010] Further, the trigger module is specifically configured to, when the first duration or the second duration is greater than N times the preset period threshold and N is greater than 2, send the third signal to the driving module as a driving signal; the third signal includes multiple signal periods, and a signal period is a high-level with a duration of the preset high-level threshold and a low-level with a duration of the preset low-level threshold.

[0011] In a second aspect, an embodiment of the present application provides a leakage protection method for dynamically adjusting a driving signal, including: The amplification module amplifies the leakage signal to obtain an amplified signal and sends it to the comparison module; The comparison module compares the amplified signal with a preset leakage threshold to obtain a comparison signal and sends it to the filtering module; The filtering module filters the comparison signal to obtain a trigger signal and sends it to the trigger module; The trigger module generates a driving signal according to the trigger signal and sends it to the driving module; The driving module disconnects the protection switch at the high level of the driving signal.

[0012] Further, the above-mentioned trigger module generates a driving signal according to the trigger signal, including: Obtain the first duration and the second duration of the trigger signal; Wherein, the first duration is the duration of any high-level of the trigger signal, and the second duration is the sum of the durations of any two consecutive high-levels of the trigger signal and the duration of the intermediate low-level; Generate a driving signal according to the first duration and the second duration.

[0013] Further, the above-mentioned generating a driving signal according to the first duration and the second duration includes: When the first duration is less than the preset high-level threshold, send the first signal to the driving module as a driving signal; the first signal includes a high-level with a duration of the preset high-level threshold.

[0014] Further, the above-mentioned generating a driving signal according to the first duration and the second duration further includes: When the second time duration is less than the preset period threshold, the first signal is sent to the drive module as the drive signal; wherein, the preset period threshold is equal to the sum of the preset high-level threshold and the preset low-level threshold.

[0015] In summary, compared with the prior art, the beneficial effects brought by the technical solution provided by the embodiment of the present application at least include: A leakage protection device for dynamically adjusting a drive signal provided by an embodiment of the present application. First, after a comparator compares an amplified signal to generate a comparison signal, an anti-interference filter is used by a filtering module to filter the comparison signal to ensure the quality and stability of the trigger signal. Then, a trigger module generates a drive signal according to the filtered trigger signal to control the drive module to trip, rather than directly broadening the trigger signal. This can not only prevent the drive signal from being too short and making the tripping action of the protection switch unstable, but also prevent the thyristor and the protection switch from working continuously for a long time due to the drive signal being too long, reduce the probability of device burnout, and improve the service life. Description of the Drawings

[0016] Figure 1 It is a structural diagram of a leakage protection device for dynamically adjusting a drive signal provided by an exemplary embodiment of the present application.

[0017] Figure 2 It is a trigger mode and timing diagram of different drive signals provided by an exemplary embodiment of the present application. Detailed Embodiments

[0018] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments.

[0019] Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present application.

[0020] Please refer to Figure 1 , an embodiment of the present application provides a leakage protection device for dynamically adjusting a drive signal, including: An amplification module, configured to amplify a leakage signal to obtain an amplified signal and send it to a comparison module.

[0021] Among them, the amplification module may adopt an operational amplifier region or a gain amplifier.

[0022] A comparison module, configured to compare the amplified signal with a preset leakage threshold to obtain a comparison signal and send it to a filtering module.

[0023] Specifically, the preset leakage threshold can be a reference voltage. If the effective value or peak value of the amplified signal exceeds this reference voltage, a pulse is generated. The specific principle is a function already existing in current leakage protectors and will not be elaborated further.

[0024] The filtering module is used to filter the comparison signal to obtain a trigger signal and send it to the trigger module.

[0025] Specifically, the filtering module can use methods such as Kalman filtering or mean filtering for filtering operations.

[0026] The trigger module is used to generate a drive signal according to the trigger signal and send it to the drive module.

[0027] Specifically, the trigger module obtains the first duration t1 and the second duration t3 of the trigger signal; among them, please refer to Figure 2 , the first duration t1 is the duration of any high-level segment of the trigger signal, and the second duration t3 is the sum of the durations of any two consecutive high-level segments of the trigger signal and the duration of the intermediate low-level segment; a drive signal is generated according to the first duration t1 and the second duration t3.

[0028] Specifically, the trigger module is used to, when the first duration is less than the preset high-level threshold, send the first signal as the drive signal to the drive module; the first signal includes a high-level segment with a duration equal to the preset high-level threshold.

[0029] Please refer to Figure 2 For the first triggering case in, when t1 of the trigger signal DF is less than the preset high-level threshold t2, the output drive signal DOUT is a signal with only one high-level segment with a length of t2, and the rest of the time is all low-level.

[0030] Specifically, the trigger module is further used to, when the second duration t3 is less than the preset period threshold, send the first signal as the drive signal to the drive module; among them, the preset period threshold is equal to the sum of the preset high-level threshold t2 and the preset low-level threshold t4.

[0031] Please refer to Figure 2 For the second triggering case in, when t3 of the trigger signal DF is less than the preset period threshold t2 + t4, the output drive signal DOUT is also a signal with only one high-level segment with a length of t2, and the rest of the time is all low-level.

[0032] Furthermore, the trigger module is specifically further used to, when the first duration or the second duration is less than twice the preset period threshold and greater than the preset period threshold, send the second signal as the drive signal to the drive module; the second signal includes two high-level segments with durations equal to the preset high-level threshold, and the low-level duration between the two high-level segments is the preset low-level threshold.

[0033] Please refer toFigure 2 For the third triggering situation, when the triggering signal DF satisfies 2×(t2 + t4) > the first duration t1 > t2 + t4, or satisfies 2×(t2 + t4) > the second duration t3 > t2 + t4, the output driving signal DOUT is two high levels, and the duration of each high level is the preset high-level threshold t2, and the time interval between the two high levels is the preset low-level threshold t4.

[0034] Furthermore, the triggering module is specifically configured to, when the first duration or the second duration is greater than the preset period threshold multiplied by N and N is greater than 2, send the third signal as the driving signal to the driving module; the third signal includes multiple signal periods, and a signal period is a high level with a duration of the preset high-level threshold and a low level with a duration of the preset low-level threshold.

[0035] Please refer to Figure 2 For the fourth triggering situation, when the triggering signal DF satisfies the first duration t1 > N×(t2 + t4) or the second duration t3 > N×(t2 + t4), where N is greater than 2, the output driving signal DOUT is a periodic signal, and each period consists of a high level with a duration of the preset high-level threshold t2 and a low level with a duration of the preset low-level threshold t4.

[0036] The driving module is used to disconnect the protection switch at the high level of the driving signal.

[0037] In the leakage protection device for dynamically adjusting the driving signal provided in the above embodiment, first, after the comparator compares the amplified signal to generate a comparison signal, the filtering module performs anti-interference filtering on the comparison signal to ensure the quality and stability of the triggering signal. Then, the triggering module generates a driving signal according to the filtered triggering signal to control the driving module to trip, rather than directly broadening the triggering signal. This can not only prevent the driving signal from being too short and making the tripping action of the protection switch unstable, but also prevent the thyristor and the protection switch from working continuously for a long time due to the driving signal being too long, reduce the probability of device burnout, and improve the service life.

[0038] Another embodiment of the present application provides a method for dynamically adjusting a driving signal for leakage protection, including: Step S1, the amplification module amplifies the leakage signal to obtain an amplified signal and sends it to the comparison module.

[0039] Step S2, the comparison module compares the amplified signal with the preset leakage threshold to obtain a comparison signal and sends it to the filtering module.

[0040] Step S3, the filtering module filters the comparison signal to obtain a triggering signal and sends it to the triggering module.

[0041] Step S4: The triggering module generates a driving signal according to the triggering signal and sends it to the driving module.

[0042] Step S5: The driving module disconnects the protection switch at the high level of the driving signal.

[0043] Furthermore, the above-mentioned triggering module generates a driving signal according to the triggering signal, including: Step S41: Obtain the first duration and the second duration of the triggering signal; wherein, the first duration is the duration of any high level of the triggering signal, and the second duration is the sum of the durations of any two consecutive high levels of the triggering signal and the duration of the intermediate low level.

[0044] Step S42: Generate a driving signal according to the first duration and the second duration.

[0045] Furthermore, the above-mentioned generating a driving signal according to the first duration and the second duration includes: When the first duration is less than the preset high-level threshold, use the first signal as the driving signal and send it to the driving module; the first signal includes a high level with a duration of the preset high-level threshold.

[0046] Furthermore, the above-mentioned generating a driving signal according to the first duration and the second duration further includes: When the second duration is less than the preset period threshold, use the first signal as the driving signal and send it to the driving module; wherein, the preset period threshold is equal to the sum of the preset high-level threshold and the preset low-level threshold.

[0047] Furthermore, the above-mentioned generating a driving signal according to the first duration and the second duration further includes: When the first duration or the second duration is less than 2 times the preset period threshold and greater than the preset period threshold, use the second signal as the driving signal and send it to the driving module; the second signal includes two high levels with durations both equal to the preset high-level threshold, and the low-level duration between the two high levels is the preset low-level threshold.

[0048] Furthermore, the above-mentioned generating a driving signal according to the first duration and the second duration further includes: When the first duration or the second duration is greater than N times the preset period threshold and N is greater than 2, use the third signal as the driving signal and send it to the driving module; the third signal includes multiple signal cycles, and a signal cycle is a high level with a duration of the preset high-level threshold and a low level with a duration of the preset low-level threshold.

[0049] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0050] The embodiments described above merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A leakage protection device for dynamically adjusting a driving signal, characterized in that, Including: An amplification module for amplifying a leakage signal to obtain an amplified signal and sending it to a comparison module; A comparison module for comparing the amplified signal with a preset leakage threshold to obtain a comparison signal and sending it to a filtering module; A filtering module for filtering the comparison signal to obtain a trigger signal and sending it to a trigger module; A trigger module for generating a drive signal according to the trigger signal and sending it to a drive module; A drive module for disconnecting a protection switch at the high level of the drive signal.

2. The leakage protection device for dynamically adjusting a drive signal according to claim 1, wherein The trigger module is specifically configured to obtain a first duration and a second duration of the trigger signal; wherein, the first duration is the duration of any high-level segment of the trigger signal, and the second duration is the sum of the durations of any two consecutive high-level segments of the trigger signal and the duration of the intermediate low-level segment; generating the drive signal according to the first duration and the second duration.

3. The leakage protection device for dynamically adjusting a driving signal according to claim 2, wherein The trigger module is specifically configured to, when the first duration is less than a preset high-level threshold, use a first signal as the drive signal and send it to the drive module; the first signal includes a high level with a duration of the preset high-level threshold.

4. The leakage protection device for dynamically adjusting a driving signal according to claim 3, wherein The trigger module is specifically further configured to, when the second duration is less than a preset period threshold, use the first signal as the drive signal and send it to the drive module; wherein, the preset period threshold is equal to the sum of the preset high-level threshold and the preset low-level threshold.

5. The leakage protection device for dynamically adjusting a drive signal according to claim 4, wherein, The trigger module is specifically further configured to, when the first duration or the second duration is less than 2 times the preset period threshold and greater than the preset period threshold, use a second signal as the drive signal and send it to the drive module; the second signal includes two high levels with durations both equal to the preset high-level threshold, and the duration of the low level between the two high levels is the preset low-level threshold.

6. The leakage protection device for dynamically adjusting a drive signal according to claim 5, characterized in that, The trigger module is specifically configured to, when the first duration or the second duration is greater than N times the preset period threshold and N is greater than 2, use a third signal as the drive signal and send it to the drive module; the third signal includes multiple signal periods, and the signal period is a high level with a duration of the preset high-level threshold and a low level with a duration of the preset low-level threshold.

7. A leakage protection method for dynamically adjusting a driving signal, characterized in that, Including: The amplification module amplifies the leakage signal to obtain an amplified signal and sends it to the comparison module; The comparison module compares the amplified signal with the preset leakage threshold to obtain a comparison signal and sends it to the filtering module; The filtering module filters the comparison signal to obtain a trigger signal and sends it to the trigger module; The trigger module generates a drive signal according to the trigger signal and sends it to the drive module; The drive module disconnects the protection switch at the high level of the drive signal.

8. The leakage protection method for dynamically adjusting a driving signal according to claim 7, characterized in that, The trigger module generates a drive signal according to the trigger signal, including: Obtaining the first duration and the second duration of the trigger signal; Wherein, the first duration is the duration of any high-level segment of the trigger signal, and the second duration is the sum of the durations of any two consecutive high-level segments of the trigger signal and the duration of the intermediate low-level segment; Generating the drive signal according to the first duration and the second duration.

9. The leakage protection method for dynamically adjusting a driving signal according to claim 8, wherein, Generating the drive signal according to the first duration and the second duration includes: When the first duration is less than a preset high-level threshold, sending a first signal as the drive signal to the drive module; the first signal includes a high level with a duration of the preset high-level threshold.

10. The leakage protection method for dynamically adjusting a drive signal according to claim 9, wherein Generating the drive signal according to the first duration and the second duration further includes: When the second duration is less than a preset period threshold, sending the first signal as the drive signal to the drive module; wherein, the preset period threshold is equal to the sum of the preset high-level threshold and the preset low-level threshold.

Images