A leakage protection device and method for dynamically adjusting driving signals

Abstract

The present application belongs to the field of leakage protection technology, and discloses a leakage protection device and method for dynamically adjusting a driving signal, the device comprising: an amplifying module for amplifying a leakage signal, obtaining an amplified signal and sending it to a comparing module; a comparing module for comparing the amplified signal with a preset leakage threshold, obtaining a comparison signal and sending it to a filtering module; a filtering module for filtering the comparison signal, obtaining a trigger signal and sending it to a triggering module; a triggering module for generating a driving signal according to the triggering signal and sending it to the driving module; a driving module for disconnecting a protection switch at a high level of the driving signal. The present application can prevent the tripping action of the protection switch from being unstable due to a driving signal being too short, and at the same time prevent the thyristor and protection switch from working for a long time due to an excessively long driving, thereby reducing the probability of device burnout and increasing service life.

Description

Technical Field

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

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

[0003] However, the driving signal formed in this way can only prevent the signal from being too short, which makes the tripping action of the protection switch unstable. However, in actual application, a long leakage signal will appear, causing the corresponding widened driving signal to be too long. If the driving thyristor and protection switch continue to work for a long time, it is easy to burn out the protection switch or thyristor and other devices. Summary of the Invention

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

[0005] In a first aspect, an embodiment of the present application provides a leakage protection device for dynamically adjusting a driving signal, comprising:

[0006] an amplifying module, used to amplify the leakage signal, obtain an amplified signal and send it to the comparing module;

[0007] A comparison module is used to compare the amplified signal with a preset leakage threshold, obtain a comparison signal and send it to the filtering module;

[0008] A filtering module is used to filter the comparison signal to obtain a trigger signal and send it to the trigger module;

[0009] A trigger module is used to generate a driving signal according to the trigger signal and send it to the driving module;

[0010] The driving module is used to disconnect the protection switch when the driving signal is at a high level.

[0011] Furthermore, the trigger module is specifically used to obtain a first duration and a second duration of a 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 duration of any two consecutive high levels of the trigger signal and the duration of the intermediate low level; and a driving signal is generated according to the first duration and the second duration.

[0012] Furthermore, the trigger module is specifically configured to send the first signal as a driving signal to the driving module when the first duration is less than a preset high level threshold; the first signal includes a high level with a duration equal to the preset high level threshold.

[0013] Furthermore, the trigger module is specifically configured to send the first signal as a driving signal to the driving module when the second time duration is less than a preset period threshold; wherein the preset period threshold is equal to the sum of a preset high level threshold and a preset low level threshold.

[0014] Furthermore, the trigger module is specifically used to send the second signal as a driving signal to the driving module when the first duration or the second duration is less than the preset cycle threshold multiplied by 2 and greater than the preset cycle threshold; the second signal includes two high levels with durations of the preset high level threshold, and the low level duration between the two high levels is the preset low level threshold.

[0015] Furthermore, the trigger module is specifically used to send the third signal as a driving signal to the driving module when the first duration or the second duration is greater than the preset cycle threshold multiplied by N and N is greater than 2; the third signal includes multiple signal cycles, and the signal cycle is a high level with a duration of a preset high level threshold and a low level with a duration of a preset low level threshold.

[0016] In a second aspect, an embodiment of the present application provides a leakage protection method for dynamically adjusting a driving signal, comprising:

[0017] The amplifying module amplifies the leakage signal, obtains an amplified signal and sends it to the comparing module;

[0018] The comparison module compares the amplified signal with a preset leakage threshold, obtains a comparison signal and sends it to the filtering module;

[0019] The filter module filters the comparison signal to obtain a trigger signal and sends it to the trigger module;

[0020] The trigger module generates a driving signal according to the trigger signal and sends it to the driving module;

[0021] The driving module disconnects the protection switch when the driving signal is at a high level.

[0022] Furthermore, the trigger module generates a driving signal according to the trigger signal, including:

[0023] Obtaining a first duration and a second duration of a trigger signal;

[0024] The first duration is the duration of any high level segment of the trigger signal, and the second duration is the sum of the duration of any two consecutive high levels of the trigger signal and the duration of the intermediate low level;

[0025] A driving signal is generated according to the first duration and the second duration.

[0026] Furthermore, the above-mentioned generating of the driving signal according to the first duration and the second duration includes:

[0027] When the first duration is less than the preset high level threshold, the first signal is sent to the driving module as a driving signal; the first signal includes a high level with a duration equal to the preset high level threshold.

[0028] Furthermore, the above method of generating a driving signal according to the first duration and the second duration further includes:

[0029] When the second time duration is less than a preset period threshold, the first signal is sent 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.

[0030] In summary, compared with the prior art, the technical solutions provided by the embodiments of the present application have at least the following beneficial effects:

[0031] An embodiment of the present application provides a leakage protection device that dynamically adjusts a driving signal. First, after a comparator compares an amplified signal to generate a comparison signal, a filtering module performs anti-interference filtering on the comparison signal to ensure the quality and stability of the trigger signal. Then, the trigger module generates a driving signal based on the filtered trigger signal to control the driving module to trip, rather than directly widening the trigger signal. This not only prevents the driving signal from being too short, which makes the tripping action of the protection switch unstable, but also prevents the thyristor and protection switch from working for a long time due to excessive driving, thereby reducing the probability of component burnout and increasing the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A structural diagram of a leakage protection device for dynamically adjusting a driving signal provided by an exemplary embodiment of the present application.

[0033] Figure 2 The trigger modes and timing diagrams of different driving signals provided for an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0035] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0036] See Figure 1, an embodiment of the present application provides a leakage protection device for dynamically adjusting a driving signal, comprising:

[0037] The amplification module is used to amplify the leakage signal, obtain an amplified signal and send it to the comparison module.

[0038] The amplification module may be an operational amplifier or a gain amplifier.

[0039] The comparison module is used to compare the amplified signal with a preset leakage threshold, obtain a comparison signal and send it to the filtering module.

[0040] Specifically, the preset leakage threshold can be a reference voltage. If the effective value of the voltage or the voltage peak of the amplified signal exceeds the reference voltage, a pulse is generated. The specific principle is an existing function in the current leakage protector and will not be elaborated on.

[0041] The filtering module is used to filter the comparison signal to obtain a trigger signal and send it to the trigger module.

[0042] Specifically, the filtering module may use methods such as Kalman filtering or mean filtering to perform filtering operations.

[0043] The trigger module is used to generate a driving signal according to the trigger signal and send it to the driving module.

[0044] Specifically, the trigger module obtains the first duration t1 and the second duration t3 of the trigger signal; wherein, see 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 duration of any two consecutive high levels of the trigger signal and the duration of the middle low level; the driving signal is generated according to the first duration t1 and the second duration t3.

[0045] The trigger module is specifically configured to send the first signal as a driving signal to the driving module when the first duration is less than a preset high level threshold; the first signal includes a high level with a duration equal to the preset high level threshold.

[0046] See Figure 2 In the first triggering situation, when t1 of the trigger signal DF is less than the preset high level threshold t2, the output drive signal DOUT is a high level signal with only a length of t2, and is low level for the rest of the time.

[0047] The trigger module is further configured to send the first signal as a driving signal to the driving module when the second time duration t3 is less than a preset period threshold; wherein the preset period threshold is equal to the sum of a preset high level threshold t2 and a preset low level threshold t4.

[0048] See Figure 2In the second triggering situation, when t3 of the trigger signal DF is less than the preset period threshold t2+t4, the output drive signal DOUT is also a high-level signal with only a length of t2, and is low-level for the rest of the time.

[0049] Furthermore, the trigger module is specifically used to send the second signal as a driving signal to the driving module when the first duration or the second duration is less than the preset cycle threshold multiplied by 2 and greater than the preset cycle threshold; the second signal includes two high levels with durations of the preset high level threshold, and the low level duration between the two high levels is the preset low level threshold.

[0050] See Figure 2 In the third triggering situation, when the trigger signal DF satisfies 2×(t2+t4)>first duration t1>t2+t4, or satisfies 2×(t2+t4)>second duration t3>t2+t4, the output drive signal DOUT is two high levels, the duration of the 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.

[0051] Furthermore, the trigger module is specifically used to send the third signal as a driving signal to the driving module when the first duration or the second duration is greater than the preset cycle threshold multiplied by N and N is greater than 2; the third signal includes multiple signal cycles, and the signal cycle is a high level with a duration of a preset high level threshold and a low level with a duration of a preset low level threshold.

[0052] See Figure 2 In the fourth trigger situation, when the trigger 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 drive signal DOUT is a periodic signal, and each period consists of a high level with a duration equal to the preset high level threshold t2 and a low level with a duration equal to the preset low level threshold t4.

[0053] The driving module is used to disconnect the protection switch when the driving signal is at a high level.

[0054] The above embodiment provides a leakage protection device that dynamically adjusts the driving signal. 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 trigger signal. Then, the trigger module generates a driving signal based on the filtered trigger signal to control the driving module to trip, rather than directly widening the trigger signal. This not only prevents the driving signal from being too short, which makes the tripping action of the protection switch unstable, but also prevents the thyristor and protection switch from working for a long time due to excessive driving, thereby reducing the probability of device burnout and increasing service life.

[0055] Another embodiment of the present application provides a leakage protection method for dynamically adjusting a driving signal, comprising:

[0056] In step S1 , the amplifying module amplifies the leakage signal to obtain an amplified signal and sends the amplified signal to the comparing module.

[0057] In step S2, the comparison module compares the amplified signal with a preset leakage threshold, obtains a comparison signal and sends it to the filtering module.

[0058] Step S3: The filtering module filters the comparison signal to obtain a trigger signal and sends it to the trigger module.

[0059] In step S4, the trigger module generates a driving signal according to the trigger signal and sends the driving signal to the driving module.

[0060] Step S5: The driving module turns off the protection switch when the driving signal is at a high level.

[0061] Furthermore, the trigger module generates a driving signal according to the trigger signal, including:

[0062] Step S41, obtaining the first duration and 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 duration of any two consecutive high levels of the trigger signal and the duration of the intermediate low level.

[0063] Step S42: Generate a driving signal according to the first duration and the second duration.

[0064] Furthermore, the above-mentioned generating of the driving signal according to the first duration and the second duration includes:

[0065] When the first duration is less than the preset high level threshold, the first signal is sent to the driving module as a driving signal; the first signal includes a high level with a duration equal to the preset high level threshold.

[0066] Furthermore, the above method of generating a driving signal according to the first duration and the second duration further includes:

[0067] When the second time duration is less than a preset period threshold, the first signal is sent 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.

[0068] Furthermore, the above method of generating a driving signal according to the first duration and the second duration further includes:

[0069] When the first duration or the second duration is less than the preset cycle threshold multiplied by 2 and greater than the preset cycle threshold, the second signal is sent to the driving module as a driving signal; the second signal includes two high levels with durations both of which are the preset high level threshold, and the low level duration between the two high levels is the preset low level threshold.

[0070] Furthermore, the above method of generating a driving signal according to the first duration and the second duration further includes:

[0071] When the first duration or the second duration is greater than the preset cycle threshold multiplied by N and N is greater than 2, the third signal is sent to the driving module as a driving signal; the third signal includes multiple signal cycles, and the signal cycle is a high level with a duration of a preset high level threshold and a low level with a duration of a preset low level threshold.

[0072] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, 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, they should be considered to be within the scope of this specification.

[0073] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A leakage protection device for dynamically adjusting a driving signal, characterized in that: include: an amplifying module, used to amplify the leakage signal, obtain an amplified signal and send it to the comparing module; A comparison module, configured to compare the amplified signal with a preset leakage threshold, obtain a comparison signal, and send the comparison signal to the filtering module; A filtering module, configured to filter the comparison signal to obtain a trigger signal and send the result to a trigger module; A trigger module, configured to generate a driving signal according to the trigger signal and send the driving signal to the driving module; 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 duration of any two consecutive high levels of the trigger signal and the duration of the intermediate low level; when the first duration is less than a preset high level threshold, the first signal is sent to the driving module as the driving signal; the first signal includes a high level segment with a duration equal to the preset high level threshold; when the first duration or the second duration is less than a preset period threshold multiplied by 2 and greater than the preset period threshold, the second signal is sent to the driving module as the driving signal; 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; wherein the preset period threshold is equal to the sum of the preset high level threshold and the preset low level threshold; The driving module is used to disconnect the protection switch when the driving signal is at a high level.

2. The leakage protection device for dynamically adjusting the driving signal according to claim 1, characterized in that: The trigger module is further configured to send the first signal as the driving signal to the driving module when the second time duration is less than the preset period threshold.

3. The leakage protection device for dynamically adjusting the driving signal according to claim 2, characterized in that: The trigger module is specifically configured to send a third signal as the driving signal to the driving module when the first duration or the second duration is greater than the preset cycle threshold multiplied by N and N is greater than 2; the third signal includes multiple signal cycles, and the signal cycle is a high level with a duration equal to the preset high level threshold and a low level with a duration equal to the preset low level threshold.

4. A leakage protection method for dynamically adjusting a driving signal, characterized in that: include: The amplifying module amplifies the leakage signal, obtains an amplified signal and sends it to the comparing module; The comparison module compares the amplified signal with a preset leakage threshold, obtains a comparison signal and sends it to the filtering module; The filtering module filters the comparison signal to obtain a trigger signal and sends the trigger signal to the trigger module; The trigger module generates a driving signal according to the trigger signal and sends it to the driving module; specifically, the first duration and the second duration of the trigger signal are obtained; the first duration is the duration of any high level of the trigger signal, and the second duration is the sum of the duration of any two consecutive high levels of the trigger signal and the duration of the middle low level; when the first duration is less than the preset high level threshold, the first signal is used as the driving signal; the first signal includes a high level for a duration of the preset high level threshold; when the first duration or the second duration is less than the preset cycle threshold multiplied by 2 and greater than the preset cycle threshold, the second signal is sent to the driving module as the driving signal; the second signal includes two high levels for a duration both of which are the preset high level threshold, and the low level duration between the two high levels is the preset low level threshold; the preset cycle threshold is equal to the sum of the preset high level threshold and the preset low level threshold; The driving module turns off the protection switch when the driving signal is at a high level.

5. The leakage protection method for dynamically adjusting the driving signal according to claim 4, characterized in that: Also includes: When the second time duration is less than a preset period threshold, the first signal is sent to the driving module as the driving signal.

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