CN110571756A - low-power consumption anti-interference A-type leakage protector - Google Patents
low-power consumption anti-interference A-type leakage protector Download PDFInfo
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- CN110571756A CN110571756A CN201910943024.3A CN201910943024A CN110571756A CN 110571756 A CN110571756 A CN 110571756A CN 201910943024 A CN201910943024 A CN 201910943024A CN 110571756 A CN110571756 A CN 110571756A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
- H02H3/325—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors involving voltage comparison
Abstract
the invention discloses a low-power consumption anti-interference A-type leakage protector, which comprises a ring oscillator, a first amplifier and a second amplifier, wherein the ring oscillator is used for generating a modulation signal and a clock signal required by an amplifier; the power-on reset module is used for providing a global reset signal; the chopper-stabilized operational amplifier is used for amplifying the leakage signal; the reference voltage generating module is used for generating a threshold level of a leakage signal; the interference filtering module is used for filtering pulse interference signals in the electric leakage signals and triggering the threshold value comparison module; the threshold value comparison module is used for judging whether the leakage signal reaches a trip threshold value; the electric leakage waveform judging module is used for judging the type of the electric leakage signal; and the tripping signal pulse width modulation module is used for adjusting the pulse width of the tripping signal. The interference filtering module and the leakage waveform judging module can effectively prevent the false operation of the A-type leakage protector; the output of the interference filtering module is used as the wake-up signal of the threshold comparison module, so that the static power consumption of the chip can be effectively reduced, and the chip has a good market prospect.
Description
Technical Field
the invention relates to the field of integrated circuit design, in particular to an A-type leakage protector for leakage protection.
background
With the progress of science and technology and the continuous development of economy, the living standard of people is greatly improved, accompanying electric equipment tends to be large-scale and complicated, such as large-scale charging piles, energy-saving equipment and the like, and a large amount of non-sinusoidal alternating current residual current is introduced into an electric circuit. The traditional AC type residual current protector only can protect the alternating current leakage and cannot protect the direct current pulsation.
The A-type leakage protector not only protects the alternating current leakage, but also protects the direct current pulse leakage. Therefore, the A-type leakage protector has more comprehensive and reliable protection than the AC-type leakage protector.
CN 104300494a discloses an a-type leakage protector with consistent leakage tripping current value, the chip determines the leakage signal by determining the time range of the occurrence of the overshoot value detected by the mutual inductor, however, because the amplitude of the overshoot value induced by different mutual inductors and the time range of the occurrence are different, the chip has poor adaptability to different mutual inductors and has a problem of large static power consumption.
disclosure of Invention
in order to overcome the defects of the prior art, the invention provides a low-power-consumption anti-interference A-type leakage protector.
A low-power consumption anti-interference A-type leakage protector comprises a chip integrated with the chip:
The annular oscillator is used for generating a modulation signal required by the chopper-stabilized operational amplifier and clock signals required by the interference filtering module, the leakage waveform judging module and the tripping signal pulse width modulation module;
the power-on reset module is used for generating a global reset signal;
The chopper-stabilized operational amplifier is used for amplifying the leakage signal sensed by the mutual inductance coil;
The reference voltage generating module is used for generating a threshold level of a leakage signal;
The 2.5V comparator is used for comparing the amplified leakage signal with the common mode level of the amplifier, and if the amplified leakage signal is higher than the common mode level, the 2.5V comparator outputs a high level; if the amplified leakage signal is lower than the common mode level, the output of the 2.5V comparator keeps low level;
The interference filtering module is used for filtering pulse interference signals in the electric leakage signals and triggering the threshold value comparison module;
the threshold value comparison module is used for judging whether the leakage signal reaches a trip threshold value;
The electric leakage waveform judging module is used for judging the type of the electric leakage signal, resetting and resetting at regular time, judging whether the electric leakage signal is continuous or not and generating a tripping signal;
And the tripping signal pulse width modulation module is used for adjusting the pulse width of the tripping signal.
The reference voltage generating module is used for generating leakage signals with lag angles of +/-0 degrees, +/-90 degrees, +/-135 degrees, +/-0 degrees +6mA and threshold levels of AC leakage signals.
the interference filtering module is used for filtering pulse interference signals induced by the mutual inductance coil, and output signals of the interference filtering module are used as wake-up signals of the threshold comparison module; comparing the amplified leakage signal with a 2.5V comparator, and respectively obtaining comparison signals of 0.2ms before filtering and 0.5ms before filtering through a pulse modulation module; taking the rising edge of the comparison signal after filtering the first 0.2ms as a wake-up signal of the threshold comparison module, and if the comparison signal after filtering the first 0.2ms does not have the rising edge, keeping the threshold comparison module forbidden; taking a rising edge signal of the comparison signal after filtering the first 0.5ms as a counting trigger signal, and if the comparison signal after filtering the first 0.5ms has a rising edge, adding 0.5ms on the basis of the comparison signal after filtering the first 0.5 ms; if the comparison signal after 0.5ms before filtering does not have a rising edge, the circuit does not perform subsequent processing.
the threshold comparison module is used for comparing the leakage signal amplified by the amplifier with a threshold level output by the reference voltage generation module, judging whether the leakage signal reaches a preset threshold, outputting a high level according to a peak comparison result of a corresponding waveform if the leakage signal with a current lag angle of +0 degrees, +90 degrees and +135 degrees and AC leakage are higher than the corresponding threshold level, triggering a D trigger by a rising edge, keeping the high level until waveform discrimination is finished, resetting the reset signal to zero and comparing the result until waveform discrimination is finished, and waiting for next comparison; for the leakage signals with current lag angles of-0 degrees, -90 degrees, -135 degrees, if the trough value of the amplified leakage signal is lower than the corresponding threshold level, the peak value comparison result of the corresponding waveform outputs high level, the rising edge triggers the D trigger, the high level is kept until the waveform discrimination is finished, and the reset signal clears the comparison result to wait for the next comparison.
The leakage waveform judging module comprises a waveform judging module, a resetting and enabling signal generating module and a leakage signal continuity judging module and is used for judging the type of a leakage signal, resetting and resetting each module at regular time, judging whether the leakage signal is continuous or not and generating a tripping signal; the comparison signal output by the interference filtering module enters a leakage waveform judging module, the leakage waveform judging module counts the comparison signal, the counting result is compared with a leakage signal with a current lag angle of +/-0 degrees, +/-90 degrees, +/-135 degrees, +/-0 degrees +6mA and a duty ratio corresponding to an AC type leakage signal, if the counting result is consistent with the duty ratio of any leakage signal, the duty ratio judging signal corresponding to the leakage signal outputs a high level, and if the threshold value comparing module corresponding to the leakage signal simultaneously outputs a high level, an initial trip signal is output; otherwise, the duty ratio judging signal of the leakage signal keeps low level.
The reset and enable signal generation module is used for resetting and clearing all the modules, the rising edge of a comparison signal output by the interference filtering module triggers the D latch, the D latch keeps a high level all the time before the reset signal is generated, the counter counts the output of the D trigger, the reset signal of a trip signal is output in 16ms, the enable signal is output in 19.6ms, the reset signals of the electric leakage waveform discrimination module and the threshold value comparison module are output in 19.8ms, and the reset signal of the reset and enable signal generation module is output in 20 ms.
the leakage signal continuity judging module is used for judging the continuity of the leakage signal and preventing the false triggering of the leakage protector, and the leakage protector outputs a final tripping signal only when a new tripping signal is generated in the output module within 22ms of an initial tripping signal generated in the output module; if the initial tripping signal is generated within the range of 22ms, no new initial tripping signal is generated, the initial tripping signal is cleared, and the final tripping signal is not output to drive the peripheral circuit.
The tripping signal pulse width modulation module is used for adjusting the pulse width of the tripping signal, the final tripping signal output by the leakage signal continuity judgment module is used as the trigger signal of the D trigger, and after 16ms, the resetting and enabling signal generation module generates the resetting signal of the tripping signal and clears the tripping signal.
compared with the prior art, the method has the advantages that the output signal of the interference filtering module is used as the wake-up signal of the threshold comparison module, and the threshold comparison module is forbidden when no leakage signal exists, so that the static power consumption of the chip is greatly reduced, and the simulation result shows that the whole static power consumption is reduced from 326 muA to 260 muA, and the whole static power consumption is reduced by about 20%; the chip has better anti-interference capability by utilizing the interference filtering module and the tripping continuity judging module; the chopper-stabilized operational amplifier can effectively reduce offset and noise and effectively improve the consistency of tripping current values.
Drawings
FIG. 1 is a block diagram of a low power consumption anti-interference A-type earth leakage protector system;
FIG. 2 is a process of processing a leakage signal with a lag angle of +0 degrees according to the present invention;
FIG. 3 is a process of processing a leakage signal with a lag angle of +90 degrees according to the present invention;
FIG. 4 is a process of processing a leakage signal with a lag angle of +135 degrees according to the present invention;
FIG. 5 is a process of processing a leakage signal with a lag angle of-0 according to the present invention;
FIG. 6 is a process of processing a leakage signal with a lag angle of-90 degrees according to the present invention;
FIG. 7 illustrates the processing of a leakage signal with a lag angle of-135 according to the present invention;
fig. 8 is a process of processing an AC-type leakage signal according to the present invention.
Detailed Description
The low-power-consumption anti-interference A-type leakage protector is described in detail below with reference to the accompanying drawings.
fig. 1 shows a system block diagram of a low-power consumption anti-interference a-type leakage protector, which includes: the circuit comprises a ring oscillator, a power-on reset module, a chopper-stabilized operational amplifier, a reference level generation module, a 2.5V comparator, an interference filtering module, a threshold comparison module, a leakage waveform discrimination module and a tripping signal pulse width modulation module.
The ring oscillator is used for generating a modulation signal required by the chopper-stabilized operational amplifier, and clock signals required by the interference filtering module, the leakage waveform judging module and the tripping signal pulse width modulation module.
The power-on reset module provides a global reset signal.
the chopper-stabilized operational amplifier is used for amplifying the collected leakage signals, the leakage signals induced by the mutual inductance coil are only 30 ~ mV, therefore, the chopper-stabilized operational amplifier with the amplification factor of 20 is used for amplifying the leakage signals, the common mode level of the amplifying circuit is 2.5V, the influence of imbalance and noise of operational amplifier on a tripping threshold value can be effectively reduced by adopting a chopping technology, and the consistency of tripping current is improved.
The reference level generation module is used for generating a common mode level of the operational amplifier, and the lag angle is the threshold level of the leakage signal of +/-0 degree, +/-90 degrees and +/-135 degrees and the AC type leakage signal.
The 2.5V comparator is used for comparing the amplified leakage signal with the common mode level of the amplifier, and if the amplified leakage signal is higher than the common mode level, the 2.5V comparator outputs a high level; if the amplified leakage signal is lower than the common mode level, the output of the 2.5V comparator keeps low level.
The interference filtering module is used for filtering pulse interference signals in the leakage signals, the output signals of the 2.5V comparator enter the interference filtering module for processing, the rising edge of the comparison signals after 0.2ms before filtering is used as the awakening signals of the threshold comparison module, and if the comparison signals after 0.2ms before filtering do not have the rising edge, the threshold comparison module is kept forbidden; taking a rising edge signal of the comparison signal after filtering the first 0.5ms as a counting trigger signal, and if the comparison signal after filtering the first 0.5ms has a rising edge, adding 0.5ms on the basis of the comparison signal after filtering the first 0.5 ms; if the comparison signal after 0.5ms before filtering does not have a rising edge, the circuit does not perform subsequent processing, wherein the output signal of the interference filtering module is used for waking up the threshold comparison module, and when no leakage signal exists, the threshold comparison module is kept disabled, so that the static power consumption can be reduced by about 20%.
the threshold comparison module is used for comparing the electric leakage signal amplified by the amplifier with the threshold level output by the reference voltage generation module and judging whether the electric leakage signal reaches a preset threshold value. For leakage signals with current lag angles of +0 degrees, +90 degrees and +135 degrees and AC type leakage, if the wave peak value of the amplified leakage signal is higher than the corresponding threshold level, the peak value comparison result of the corresponding waveform outputs high level, the rising edge triggers a D trigger, the high level is kept until the waveform discrimination is finished, the reset signal is cleared to zero to obtain the comparison result until the waveform discrimination is finished, the next comparison is waited, and if the wave trough of the amplified leakage signal is lower than the corresponding threshold level, the peak value comparison result of the corresponding waveform keeps low level; for leakage signals with current lag angles of-0 degrees, -90 degrees, -135 degrees, if the trough value of the amplified leakage signal is lower than the corresponding threshold level, the peak value comparison result of the corresponding waveform outputs high level, the rising edge triggers the D trigger, the high level is kept until the waveform discrimination is finished, the reset signal clears the comparison result until the waveform discrimination is finished, the next comparison is waited, and if the amplified leakage signal has a trough value higher than the corresponding threshold level, the peak value comparison result of the corresponding waveform keeps low level.
The electric leakage waveform judging module is used for judging the type of the electric leakage signal, resetting and resetting the threshold value comparing module, the electric leakage waveform judging module and the tripping signal pulse width modulating module at regular time, judging whether the electric leakage signal is continuous or not and generating an initial tripping signal.
And the tripping signal pulse width modulation module is used for adjusting the pulse width of the tripping signal.
The low-power-consumption anti-interference A-type leakage protector can effectively identify leakage signals with current lag angles of +/-0 degrees, +/-90 degrees, +/-135 degrees, +/-0 degrees and +/-6 mA and AC-type leakage signals, and has good consistency of tripping current threshold values. Wherein, the processing procedure of the leakage signal of +/-0 degrees and +6mA is the same as that of the leakage signal of +/-0 degrees.
The following describes in detail the processing process of the low-power consumption anti-interference a-type leakage protector on the leakage signals with the lag angles of ± 0 °, ± 90 °, ± 135 ° and the AC-type leakage signals, including the detailed explanation of the leakage waveform judging module and the tripping signal pulse width modulating module.
as shown in fig. 2, the processing process of the +0 ° leakage signal is shown, the leakage signal is amplified by an operational amplifier and then compared with a common mode level 2.5V, a signal output by a 2.5V comparator is filtered by an interference filtering module for 0.2ms, if the signal is filtered for 0.2ms, the 2.5V comparator still has an output signal, it is indicated that leakage occurs in the line, the output signal wakes up a threshold comparing module, the threshold comparing module compares the amplified leakage signal with a threshold level corresponding to the +0 ° leakage signal, if the peak value of the amplified leakage signal is higher than the threshold comparing level of the +0 ° leakage signal, the threshold comparing result of the +0 ° leakage signal outputs a high level, the signal output by the 2.5V comparator is filtered for 0.5ms by the interference filtering module, if the signal is filtered for 0.5ms, the 2.5V comparator still has an output, the filtered signal after 0.5ms is superimposed for 0.5ms, the signal enters a counting module for counting, if the counting result is within a range of 6.4 ms, the output result, the result is determined, and the comparison result also indicates that the output of the threshold signal is a new duty cycle, if the trip signal generated, the trip signal is generated within a trip signal, the initial pulse width modulation, and the trip signal generated within a trip signal within a trip angle of the trip signal within 16ms, and the trip signal within the trip angle.
as shown in fig. 3, the processing process of the +90 ° leakage signal is shown, the leakage signal is amplified by an operational amplifier and then compared with a common mode level 2.5V, a signal output by a 2.5V comparator is filtered by an interference filtering module for 0.2ms, if the signal is filtered for 0.2ms, the 2.5V comparator still has an output signal, it is indicated that leakage occurs in the line, the output signal wakes up a threshold comparing module, the threshold comparing module compares the amplified leakage signal with a threshold level corresponding to the +90 ° leakage signal, if the peak value of the amplified leakage signal is higher than the threshold comparing level of the +90 ° leakage signal, the threshold comparing result of the +90 ° leakage signal outputs a high level, the signal output by the 2.5V comparator is filtered for 0.5ms by the interference filtering module, if the signal is filtered for 0.5ms, the 2.5V comparator still has an output, the filtered signal after 0.5ms is superimposed for 0.5ms, the signal enters a counting module for counting, if the counting result is within a range of 4.2 ms, the output result is also determined that the high level is superimposed with the threshold comparing result, and the threshold level, if the signal is a new trip signal, it is determined that the trip signal, it is generated within a pulse width modulation range of the initial duty cycle, and it is indicated that the trip signal, and the trip signal generated, and.
as shown in fig. 4, the processing process of the +135 ° leakage signal is shown, the leakage signal is amplified by the operational amplifier and then compared with the common mode level 2.5V, the signal output by the 2.5V comparator is filtered by the interference filtering module for 0.2ms, if the signal is filtered for 0.2ms, the 2.5V comparator still has an output signal, it is indicated that leakage occurs in the line, the output signal wakes up the threshold comparing module, the threshold comparing module compares the amplified leakage signal with the threshold level corresponding to the +135 ° leakage signal, if the peak value of the amplified leakage signal is higher than the threshold comparing level of the +135 ° leakage signal, the threshold comparing result of the +135 ° leakage signal outputs a high level, the signal output by the 2.5V comparator is filtered for 0.5ms by the interference filtering module, if the signal is filtered for 0.5ms, the 2.5V comparator still has an output, the filtered signal after 0.5ms is superimposed for 0.5ms, the signal enters the counting module for counting, if the counting result is within the range of 1.6 ~ 3.8ms, the output result, the judging that the output result and the threshold comparing result also has an output of the high level, and the pulse width of the trip signal, if the signal generated in the initial pulse width modulation signal is a trip signal, it is indicated that the trip signal generated in the trip signal, and the trip signal generated.
~ as ~ shown ~ in ~ fig. ~ 5 ~, ~ the ~ process ~ of ~ processing ~ an ~ AC ~ - ~ type ~ leakage ~ signal ~ is ~ shown ~, ~ the ~ leakage ~ signal ~ is ~ amplified ~ by ~ an ~ operational ~ amplifier ~ and ~ then ~ compared ~ with ~ a ~ common ~ mode ~ level ~ of ~ 2.5 ~ V ~, ~ a ~ signal ~ output ~ by ~ a ~ 2.5 ~ V ~ comparator ~ is ~ filtered ~ by ~ an ~ interference ~ filtering ~ module ~ for ~ 0.2 ~ ms ~, ~ if ~ 0.2 ~ ms ~ is ~ filtered ~, ~ an ~ output ~ signal ~ still ~ exists ~ in ~ the ~ 2.5 ~ V ~ comparator ~, ~ it ~ is ~ indicated ~ that ~ leakage ~ occurs ~ in ~ a ~ line ~, ~ the ~ output ~ signal ~ wakes ~ up ~ a ~ threshold ~ comparing ~ module ~, ~ the ~ threshold ~ comparing ~ module ~ compares ~ the ~ amplified ~ leakage ~ signal ~ with ~ a ~ threshold ~ level ~ corresponding ~ to ~ a ~ + ~ 0 ~ ° ~ leakage ~ signal ~, ~ if ~ a ~ peak ~ value ~ of ~ the ~ amplified ~ leakage ~ signal ~ is ~ higher ~ than ~ a ~ threshold ~ comparing ~ level ~ of ~ the ~ AC ~ - ~ type ~ leakage ~ signal ~, ~ a ~ threshold ~ comparing ~ result ~ of ~ the ~ + ~ 0 ~ ° ~ leakage ~ signal ~ outputs ~ a ~ high ~ level ~, ~ a ~ signal ~ output ~ by ~ the ~ 2.5 ~ V ~ comparator ~ is ~ filtered ~ by ~ the ~ interference ~ filtering ~ module ~ for ~ 0.5 ~ ms ~, ~ if ~ 0.5 ~ ms ~ is ~ filtered ~, ~ the ~ 2.5 ~ V ~ comparator ~ still ~ outputs ~, ~ a ~ signal ~ after ~ 0.5 ~ ms ~ is ~ superimposed ~ for ~ 0.5 ~ ms ~, ~ the ~ signal ~ enters ~ a ~ counting ~ module ~ for ~ counting ~, ~ if ~ a ~ counting ~ result ~ is ~ within ~ a ~ range ~ of ~ 9.6 ~ ms ~, ~ the ~ output ~ level ~, ~ a ~ result ~ of ~ the ~ threshold ~ comparing ~ result ~, ~ and ~ a ~ result ~ also ~ indicates ~ that ~ a ~ new ~ signal ~ output ~ by ~ a ~ pulse ~ width ~ modulation ~ is ~ generated ~ in ~ a ~ trip ~ signal ~, ~ and ~ a ~ trip ~ signal ~, ~ if ~ a ~ new ~ pulse ~ width ~ modulation ~ signal ~ is ~ generated ~, ~ and ~ a ~ trip ~ signal ~ is ~ indicated ~ that ~ a ~ trip ~ signal ~ generated ~ in ~ a ~ trip ~ signal ~ within ~ a ~ range ~ of ~. ~
as shown in fig. 6, the process of processing a ~ 0 ° leakage signal is performed, the leakage signal is amplified by an operational amplifier and then compared with a common mode level of 2.5V, a signal output by a 2.5V comparator is filtered by an interference filtering module for 0.2ms, if an output signal still exists in the 2.5V comparator after filtering for 0.2ms, it is indicated that leakage occurs in a line, the output signal wakes up a threshold comparing module, the threshold comparing module compares the amplified leakage signal with a threshold level corresponding to the ~ 0 ° leakage signal, if a valley value of the amplified leakage signal is lower than a threshold comparing level of the ~ 0 ° leakage signal, a threshold comparing result of the ~ 0 ° leakage signal outputs a high level, a signal output by the 2.5V comparator is filtered by the interference filtering module for 0.5ms, if the amplified leakage signal is filtered for 0.5ms, the amplified signal still exists in the 2.5V comparator, the filtered signal after filtering for 0.5ms is superimposed for 0.5ms, the signal enters a counting module for counting, if a counting result is within a range of 11.2 ~ 12.6ms, a result is output, a result is also indicated that a new duty ratio is generated in a trip signal, and a trip signal is continuously generated in a trip signal, and an initial pulse width modulation signal is indicated that a trip signal generated in the trip signal.
as shown in fig. 7, the process of processing a-90 ° leakage signal is performed, the leakage signal is amplified by an operational amplifier and then compared with a common mode level of 2.5V, a signal output by a 2.5V comparator is filtered by an interference filtering module for 0.2ms, if an output signal still exists in the 2.5V comparator after filtering for 0.2ms, it is indicated that leakage occurs in a line, the output signal wakes up a threshold comparing module, the threshold comparing module compares the amplified leakage signal with a threshold level corresponding to the-90 ° leakage signal, if a valley value of the amplified leakage signal is lower than a threshold comparing level of the-90 ° leakage signal, a threshold comparing result of the-90 ° leakage signal outputs a high level, a signal output by the 2.5V comparator is filtered by the interference filtering module for 0.5ms, if the amplified leakage signal is filtered for 0.5ms, the amplified signal still exists in the threshold comparing level, the filtered signal after filtering for 0.5ms is superimposed for 0.5ms, the signal enters a counting module for counting, if the counting result is within a range of 12.8 ~.8 ms, the output result, the result is also indicated that the high level is output by a pulse width modulation signal, and the trip signal generated in the trip signal, if the initial pulse width modulation signal exists in the trip signal, it is indicated that the trip signal generated in the trip signal, and the trip signal generated in the trip signal after the trip signal, and the.
as shown in fig. 8, the process of processing a-135 ° leakage signal is performed, the leakage signal is amplified by an operational amplifier and then compared with a common mode level 2.5V, a signal output by a 2.5V comparator is filtered by an interference filtering module for 0.2ms, if an output signal still exists in the 2.5V comparator after 0.2ms is filtered, it is indicated that leakage occurs in a line, the output signal wakes up a threshold comparing module, the threshold comparing module compares the amplified leakage signal with a threshold level corresponding to the-135 ° leakage signal, if a valley value of the amplified leakage signal is lower than a threshold comparing level of the-135 ° leakage signal, a threshold comparing result of the-135 ° leakage signal outputs a high level, a signal output by the 2.5V comparator is filtered by the interference filtering module for 0.5ms, if 0.5ms is filtered, the 2.5V comparator still outputs, the filtered signal after 0.5ms is superimposed for 0.5ms, the signal enters a counting module for counting, if a counting result is within a range of 16.6 ms, a result is output, and a result is also determined that the threshold comparing result with the threshold and the threshold value and the output a new tripping signal is a trip signal, if the trip signal generated in the trip signal, it is a trip signal, it is determined that a new duty cycle is generated in a trip signal, and it is determined that the trip signal generated in a trip signal with a duty cycle.
Claims (8)
1. The utility model provides a low-power consumption anti-interference A type earth leakage protector which characterized in that, including integrated in same chip:
the annular oscillator is used for generating a modulation signal required by the chopper-stabilized operational amplifier and clock signals required by the interference filtering module, the leakage waveform judging module and the tripping signal pulse width modulation module;
the power-on reset module is used for generating a global reset signal;
The chopper-stabilized operational amplifier is used for amplifying the leakage signal sensed by the mutual inductance coil;
The reference voltage generating module is used for generating a threshold level of a leakage signal;
The 2.5V comparator is used for comparing the amplified leakage signal with the common mode level of the amplifier, and if the amplified leakage signal is higher than the common mode level, the 2.5V comparator outputs a high level; if the amplified leakage signal is lower than the common mode level, the output of the 2.5V comparator keeps low level;
The interference filtering module is used for filtering pulse interference signals in the electric leakage signals and triggering the threshold value comparison module;
The threshold value comparison module is used for judging whether the leakage signal reaches a trip threshold value;
The electric leakage waveform judging module is used for judging the type of the electric leakage signal, resetting and resetting at regular time, judging whether the electric leakage signal is continuous or not and generating a tripping signal;
and the tripping signal pulse width modulation module is used for adjusting the pulse width of the tripping signal.
2. The low-power consumption anti-interference A-type leakage protector according to claim 1, wherein the reference voltage generating module is configured to generate threshold levels of leakage signals with lag angles of ± 0 °, ± 90 °, ± 135 °, ± 0 ° +6mA, and AC-type leakage signals.
3. The low-power-consumption anti-interference A-type leakage protector is characterized in that the interference filtering module is used for filtering pulse interference signals sensed by the mutual inductance coil, and output signals of the interference filtering module are used as wake-up signals of the threshold comparison module; comparing the amplified leakage signal with a 2.5V comparator, and respectively obtaining comparison signals of 0.2ms before filtering and 0.5ms before filtering through a pulse modulation module; taking the rising edge of the comparison signal after filtering the first 0.2ms as a wake-up signal of the threshold comparison module, and if the comparison signal after filtering the first 0.2ms does not have the rising edge, keeping the threshold comparison module forbidden; taking a rising edge signal of the comparison signal after filtering the first 0.5ms as a counting trigger signal, and if the comparison signal after filtering the first 0.5ms has a rising edge, adding 0.5ms on the basis of the comparison signal after filtering the first 0.5 ms; if the comparison signal after 0.5ms before filtering does not have a rising edge, the circuit does not perform subsequent processing.
4. The low-power-consumption anti-interference A-type leakage protector according to claim 1, wherein the threshold comparison module is configured to compare the leakage signal amplified by the amplifier with a threshold level output by the reference voltage generation module, determine whether the leakage signal reaches a predetermined threshold, for the leakage signal with a current lag angle of +0 °, +90 °, +135 ° and AC-type leakage, if the peak signal of the amplified leakage wave is higher than the corresponding threshold level, output a high level according to the peak comparison result of the waveform, trigger the D flip-flop at the rising edge, maintain the high level until the waveform discrimination is finished, reset the signal comparison result, and wait for the next comparison; for the leakage signals with current lag angles of-0 degrees, -90 degrees, -135 degrees, if the trough value of the amplified leakage signal is lower than the corresponding threshold level, the peak value comparison result of the corresponding waveform outputs high level, the rising edge triggers the D trigger, the high level is kept until the waveform discrimination is finished, and the reset signal clears the comparison result to wait for the next comparison.
5. The low-power-consumption anti-interference A-type leakage protector according to claim 1, wherein the leakage waveform judging module comprises a waveform judging module, a reset and enable signal generating module and a leakage signal continuity judging module, and is used for judging the type of a leakage signal, resetting and resetting each module at regular time, judging whether the leakage signal is continuous or not and generating a trip signal; the comparison signal output by the interference filtering module enters a leakage waveform judging module, the leakage waveform judging module counts the comparison signal, the counting result is compared with a leakage signal with a current lag angle of +/-0 degrees, +/-90 degrees, +/-135 degrees, +/-0 degrees +6mA and a duty ratio corresponding to an AC type leakage signal, if the counting result is consistent with the duty ratio of any leakage signal, the duty ratio judging signal corresponding to the leakage signal outputs a high level, and if the threshold value comparing module corresponding to the leakage signal simultaneously outputs a high level, an initial trip signal is output; otherwise, the duty ratio judging signal of the leakage signal keeps low level.
6. the low-power-consumption anti-interference A-type leakage protector according to claim 5, wherein the reset and enable signal generation module is configured to reset and clear each module, a rising edge of the comparison signal output by the interference filtering module triggers the D latch, the D latch is kept at a high level until the reset signal is generated, the counter counts the output of the D latch, outputs the reset signal of the trip signal in 16ms, outputs the enable signal in 19.6ms, outputs the reset signals of the leakage waveform discrimination module and the threshold comparison module in 19.8ms, and outputs the reset and enable signal generation module reset signal in 20 ms.
7. the low-power-consumption anti-interference A-type leakage protector according to claim 5, wherein the leakage signal continuity judging module is used for judging the continuity of the leakage signal and preventing the leakage protector from being triggered mistakenly, within 22ms of an initial trip signal generated by the output module, the leakage protector outputs a final trip signal if a new trip signal is generated by the output module; if the initial tripping signal is generated within the range of 22ms, no new initial tripping signal is generated, the initial tripping signal is cleared, and the final tripping signal is not output to drive the peripheral circuit.
8. The low-power consumption anti-interference A-type leakage protector according to claim 1, wherein the tripping signal pulse width modulation module is configured to adjust the pulse width of the tripping signal, the final tripping signal output by the leakage signal continuity judging module is used as the trigger signal of the D trigger, and after 16ms, the reset and enable signal generating module generates the reset signal of the tripping signal to clear the tripping signal.
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