CN104300494A - A-type leakage protector allowing leakage tripping current values to stay same - Google Patents
A-type leakage protector allowing leakage tripping current values to stay same Download PDFInfo
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Abstract
The invention discloses an A-type leakage protector allowing leakage tripping current values to stay the same. The A-type leakage protector is formed by integrating a chopper stabilizing zero operational amplifier, a hysteresis comparator, a digital processing module and a ring oscillator on the same chip, wherein the chopper stabilizing zero operational amplifier is used for reducing offset voltage of a CMOS operational amplifier and amplifying A-type leakage induction signals; the hysteresis comparator is used for comparing the amplified A-type leakage induction signals with different A-type leakage signal comparative levels and producing corresponding leakage comparison pulses; the digital processing module is used for recognizing A-type leakage signals and producing trip signals; the ring oscillator provided with a tail current source is used for providing modulating signals for the chopper stabilizing zero operational amplifier and providing a clock for the digital processing module. The A-type leakage protector can be effectively prevented from being triggered by mistake; from triggering timing, several types of leakage waveforms are sequentially detected within subsequent successive time periods and do not interfere with each other even if the leakage waveforms are not in a standard form; due to detection within the time periods, the interference rejection of the leakage protector is also improved, and the leakage tripping current values are allowed to stay the same; accordingly, the leakage protector has prospects of market application.
Description
Technical field
The present invention relates to integrated circuit (IC) design field, particularly relate to the A type earth leakage protective device that A type electric leakage drop-away current value is consistent.
Background technology
Along with progress and the economic development of science and technology, the living standard of people has had large increase, and power consumption equipment becomes increasingly complex, especially with the electric equipment of a large amount of electronic component.As increasing in computer, teleworking utensil and household electrical appliance etc., occur in electric wiring that non-sine exchanges residual current and also gets more and more.Traditional AC type residual current operated protective device can only be guaranteed to thread off to the residue simple sinusoidal alternating current applied suddenly or slowly rise, and therefore common AC type residual current operated protective device can not meet the demands.
A type earth leakage protective device all can guarantee reliable earth leakage protective device of threading off to the electric leakage simple sinusoidal alternating current applied suddenly or slowly rise and pulsating direct current electric current.Its Cleaning Principle is the same with AC type, all adopts leakage current transformer to detect residual current, but improves the magnetic characteristic of instrument transformer, to improve the detection sensitivity to pulsating direct current electric current.
Human electric shock, power consumption equipment damage, electrical fire etc. that DC pulse electric leakage causes happen occasionally, and cause the casualties and property loss that originally should not occur, have caused the great attention of government department and people in the industry.Vigorously promote the use A type earth leakage protective device imperative.
Publication number is that the Chinese patent literature of CN102130440A discloses A type earth leakage protective device dedicated IC chip; the judgement of this chip to A type electric leakage kind is too simple; and different types of A type electric leakage drop-away current value discreteness is larger; can not meet the consistent actual requirement of drop-away current value; cause A type earth leakage protective device antijamming capability weak, be not suitable for the application that puts goods on the market.
Summary of the invention
The present invention proposes the A type earth leakage protective device that electric leakage drop-away current value is consistent.
The A type earth leakage protective device that electric leakage drop-away current value is consistent, is characterized in that, comprises and be integrated in same chip:
Chopping zero-stabilizing operational amplifier, for reducing the offset voltage of cmos operational amplifier, amplifies A type leakage inductance induction signal;
Hysteresis comparator module, makes comparisons for the A type electric leakage signal after amplifying and different A type electric leakage signal comparative level, produces corresponding electric leakage and compares pulse;
Digital signal processing module, for identifying A type electric leakage signal, and produces trip signal;
There is the ring oscillator of tail current source, for generation of HF switch clock, for the modulation signal of chopping zero-stabilizing operational amplifier, as numerical portion clock signal after frequency division.
Described A type earth leakage protective device is consistent to different A type leakage current drop-away current value, and namely to current hysteresis relief angle ± 0 °, ± 90 °, the smooth direct current electricity of ± 135 ° and current hysteresis relief angle 0 ° superposition 6mA and the electric leakage of AC type, the effective value of drop-away current is consistent.
The A type leakage inductance induction signal that described A type creepage mutual inductor induces is faint, and voltage amplitude is 10mV-20mV, is applicable to CMOS integrated circuit.
The signal ripple of described A type leakage inductance induction signal after described chopping zero-stabilizing operational amplifier amplifies is 1-5mV.
Described digital signal processing module comprises interference filtering module, A type electric leakage signal discrimination module, exports buffer module.Described interference filtering module, for the shaking interference of filtering flip-flop number pulse; Described A type electric leakage signal discrimination module, for differentiating the classification of electric leakage signal, produces trip signal; Described output buffer module, for the thyristor of driving chip outside, produces tripping operation.
Described A type electric leakage signal discrimination module is to the detection of the different leakage current type of A type, detect successively according to time sequencing, keep for be all sufficient the detection time of often kind of leakage current type, and have respective detection of electrical leakage level respectively, so there is not the problem interfered with each other.Because electric leakage signal detects within the time period, even if electric leakage waveform is not canonical form, this A type earth leakage protective device also can carry out detection of electrical leakage within the corresponding time period, improves the antijamming capability of A type earth leakage protective device.
Described A type electric leakage signal discrimination module is superimposed with the A type electric leakage signal of the smooth direct current electricity of 6mA for+0 ° ,+90 ° ,+135 ° ,+0 ° after amplification, timing trigger impulse is produced through comparing with 2.5V hysteresis comparator, within beginning timing 3ms, have electric leakage signal pulse, then this electric leakage signal current hysteresis relief angle is+135 °; Within timing 3-7ms, have electric leakage signal pulse, then this electric leakage signal current hysteresis relief angle is+90 °; Within timing 7-12ms, have electric leakage signal pulse, then this electric leakage signal current hysteresis relief angle is+0 °, also comprises the smooth direct current electricity that+0 ° is superimposed with 6mA; After amplification-0 ° ,-90 ° ,-135 ° ,-0 ° is superimposed with to the A type electric leakage signal of the smooth direct current electricity of 6mA, timing trigger impulse is produced through comparing with 2.3V hysteresis comparator, within beginning timing 3ms, have electric leakage signal pulse, then this electric leakage signal current hysteresis relief angle is-135 °; Within timing 3-7ms, have electric leakage signal pulse, then this electric leakage signal current hysteresis relief angle is-90 °; Within timing 7-12ms, have electric leakage signal pulse, then this electric leakage signal current hysteresis relief angle is-0 °, also comprises the smooth direct current electricity that-0 ° is superimposed with 6mA; For the differentiation of AC type, the AC type electric leakage signal after amplification produces timing trigger impulse through comparing with 2.3V hysteresis comparator, in 3-7ms and 13-16ms, have leakage current pulse, then this electric leakage signal is the electric leakage of AC type; After 16ms, described digital signal processing module resets, and waits for the detection of electrical leakage of next cycle.
Compared to prior art; beneficial effect of the present invention is; accurately can judge different types of A type electric leakage signal; reduce A type earth leakage protective device drop-away current value discreteness; achieve the consistent of different A type leakage current drop-away current value; improve the antijamming capability of A type earth leakage protective device, be more applicable to the application that puts goods on the market.
Accompanying drawing explanation
Figure 1A is the different A type electric leakage signal waveform schematic diagrames of traditional A type earth leakage protective device;
Figure 1B is the drop-away current value figure of traditional A type earth leakage protective device;
Fig. 2 is that the present invention is leaked electricity the structured flowchart of the consistent A type earth leakage protective device of drop-away current value;
Fig. 3 is the schematic diagram of chopping zero-stabilizing operational amplifier used in the present invention;
Fig. 4 is the ring oscillator schematic diagram with tail current source used in the present invention;
Fig. 5 is the process that+0 °, A type of the present invention electric leakage waveform differentiates;
Fig. 6 is the test waveform of+0 °, A type of the present invention electric leakage;
Fig. 7 is the process that+90 °, A type of the present invention electric leakage waveform differentiates;
Fig. 8 is the test waveform of+90 °, A type of the present invention electric leakage;
Fig. 9 is the process that+135 °, A type of the present invention electric leakage waveform differentiates;
Figure 10 is the test waveform of+135 °, A type of the present invention electric leakage;
Figure 11 is the process that-0 °, A type of the present invention electric leakage waveform differentiates;
Figure 12 is the test waveform of-0 °, A type of the present invention electric leakage;
Figure 13 is the process that-90 °, A type of the present invention electric leakage waveform differentiates;
Figure 14 is the test waveform of-90 °, A type of the present invention electric leakage;
Figure 15 is the process that-135 °, A type of the present invention electric leakage waveform differentiates;
Figure 16 is the test waveform of-135 °, A type of the present invention electric leakage;
Figure 17 is the process that A type ac leakage waveform of the present invention differentiates;
Figure 18 is the test waveform of A type ac leakage of the present invention.
Embodiment
Below the present invention's consistent A type earth leakage protective device of drop-away current value that leaks electricity is described in detail.
According to the relevant regulations of standard GB/T 16916.1-2003, GB16917.1-2003, the pulsating direct current of A type residue is divided into 7 kinds of situations: current hysteresis relief angle ± 0 °, ± 90 °, the smooth direct current electricity of ± 135 ° and current hysteresis relief angle 0 ° superposition 6mA, waveform is shown in Figure 1A.The drop-away current scope of corresponding A type earth leakage protective device as shown in Figure 1B, wherein,
i Δ n for desired action current.
As can be seen from Figure 1B; the drop-away current value of A type earth leakage protective device has certain range intervals, in order to prevent the false triggering of A type earth leakage protective device, strengthens the antijamming capability of A type earth leakage protective device; various drop-away current value should be designed to unanimously, and we are set to 30mA the operating current value of chip.Leakage current, through current transformer, by regulating sampling resistor, is converted to the electric leakage of 30mA the voltage signal of 30mV.This voltage is sent into A type earth leakage protective device and is carried out detection of electrical leakage.
Be illustrated in figure 2 the structured flowchart of the consistent A type earth leakage protective device of electric leakage drop-away current value, it comprises and is integrated in same chip:
Chopping zero-stabilizing operational amplifier, for reducing the offset voltage of cmos operational amplifier, amplifies A type leakage inductance induction signal, as shown in Figure 3 (vbias1, vbias2, vbias3, vbias4 are amplifier bias voltage);
Hysteresis comparator module, makes comparisons for the A type electric leakage signal after amplifying and different A type electric leakage signal comparative level, produces corresponding electric leakage and compares pulse;
Digital signal processing module, for identifying A type electric leakage signal, and produces trip signal;
There is the ring oscillator module of tail current source, for generation of high frequency clk and nclk of 2.56MHz, make switch controlling signal to chopping zero-stabilizing operational amplifier, this high frequency after 64 frequency divisions, for digital signal processing module provides clock, as shown in Figure 4.In actual design, the frequency of high-frequency signal is megahertz, as long as frequency dividing ratio reaches be suitable as digital module clock.
Digital signal processing module comprises 0.5ms interference filtering module, for the shaking interference of filtering flip-flop number pulse, and interference filtering time 0.3-0.5ms;
A type electric leakage signal discrimination module, for differentiating the classification of electric leakage signal, produces trip signal;
Export buffer module, for the thyristor of driving chip outside, produce tripping operation.
The course of work of the consistent A type earth leakage protective device of electric leakage drop-away current value will be described in detail below.
Be illustrated in figure 5+0 ° of earth leakage protective process.A type electric leakage signal after chopping zero-stabilizing operational amplifier amplifies first produces through hysteresis comparator with 2.5V reference level and counts trigger impulse; in the 7ms-12ms that counting starts; if have electric leakage to compare pulse to occur; then illustrate in circuit and occurred+0 ° of electric leakage; and effective value reaches 30mA, A type earth leakage protective device chip exports high level pulse, triggers thyristor; disconnect protected circuit, protection personal safety.After 16ms, digital signal processing module resets, and waits for the detection of electrical leakage in next cycle.Fig. 6 gives the test result of+0 ° of electric leakage, and in figure, above waveform is+0 ° of electric leakage signal after amplifying, below waveform be the trip signal that chip exports.
Be illustrated in figure 7+90 ° of earth leakage protective processes.A type electric leakage signal after chopping zero-stabilizing operational amplifier amplifies first produces through hysteresis comparator with 2.5V reference level and counts trigger impulse; in the 3ms-7ms that counting starts; if have electric leakage to compare pulse to occur; then illustrate in circuit and occurred+90 ° of electric leakages; and effective value reaches 30mA, A type earth leakage protective device chip exports high level pulse, triggers thyristor; disconnect protected circuit, protection personal safety.After 16ms, digital signal processing module resets, and waits for the detection of electrical leakage in next cycle.Fig. 8 gives the test results of+90 ° of electric leakages, and in figure, above waveform is+90 ° of electric leakage waveforms after amplifying, below waveform be the trip signal that chip exports.
Be illustrated in figure 9+135 ° of earth leakage protective processes.A type electric leakage signal after chopping zero-stabilizing operational amplifier amplifies first produces through hysteresis comparator with 2.5V reference level and counts trigger impulse; in the 3ms that counting starts; if have electric leakage to compare pulse to occur; then illustrate in circuit and occurred+135 ° of electric leakages; and effective value reaches 30mA, A type earth leakage protective device chip exports high level pulse, triggers thyristor; disconnect protected circuit, protection personal safety.After 16ms, digital signal processing module resets, and waits for the detection of electrical leakage in next cycle.Figure 10 gives the test results of+135 ° of electric leakages, and in figure, above waveform is+135 ° of electric leakage waveforms after amplifying, below waveform be the trip signal that chip exports.
Be-0 ° of earth leakage protective process as shown in figure 11.A type electric leakage signal after chopping zero-stabilizing operational amplifier amplifies first produces through hysteresis comparator with 2.3V reference level and counts trigger impulse; in the 7ms-12ms that counting starts; if have electric leakage to compare pulse to occur; then illustrate in circuit and occurred-0 ° of electric leakage; and effective value reaches 30mA, A type earth leakage protective device chip exports high level pulse, triggers thyristor; disconnect protected circuit, protection personal safety.After 16ms, digital signal processing module resets, and waits for the detection of electrical leakage in next cycle.Figure 12 gives the test result of-0 ° of electric leakage, and in figure, above waveform is-0 ° of electric leakage waveform after amplifying, below waveform be the trip signal that chip exports.
Be-90 ° of earth leakage protective processes as shown in figure 13.A type electric leakage signal after chopping zero-stabilizing operational amplifier amplifies first produces through hysteresis comparator with 2.3V reference level and counts trigger impulse; in the 3ms-7ms that counting starts; if have electric leakage to compare pulse to occur; then illustrate in circuit and occurred-90 ° of electric leakages; and effective value reaches 30mA, A type earth leakage protective device chip exports high level pulse, triggers thyristor; disconnect protected circuit, protection personal safety.After 16ms, digital signal processing module resets, and waits for the detection of electrical leakage in next cycle.Figure 14 gives the test results of-90 ° of electric leakages, and in figure, above waveform is-90 ° of electric leakage waveforms after amplifying, below waveform be the trip signal that chip exports.
Be-135 ° of earth leakage protective processes as shown in figure 15.A type electric leakage signal after chopping zero-stabilizing operational amplifier amplifies first produces through hysteresis comparator with 2.3V reference level and counts trigger impulse; in the 3ms that counting starts; if have electric leakage to compare pulse to occur; then illustrate in circuit and occurred-135 ° of electric leakages; and effective value reaches 30mA, A type earth leakage protective device chip exports high level pulse, triggers thyristor; disconnect protected circuit, protection personal safety.After 16ms, digital signal processing module resets, and waits for the detection of electrical leakage in next cycle.Figure 16 gives the test results of-135 ° of electric leakages, and in figure, above waveform is-135 ° of electric leakage waveforms after amplifying, below waveform be the trip signal that chip exports.
Be AC type earth leakage protective process as shown in figure 17.A type electric leakage signal after chopping zero-stabilizing operational amplifier amplifies first produces timing trigger impulse with 2.5V reference level through hysteresis comparator; in 3-7ms and 13-16ms, have electric leakage to compare pulse occur; then illustrate in circuit and occurred that AC type leaks electricity; and effective value reaches 30mA; A type earth leakage protective device chip exports high level pulse; trigger thyristor, disconnect protected circuit, protection personal safety.After 16ms, digital signal processing module resets, and waits for the detection of electrical leakage in next cycle.Figure 18 gives the test result of AC type electric leakage, and in figure, above waveform is the AC type electric leakage waveform after amplifying, below waveform be the trip signal that chip exports.
The electric leakage waveform that ± 0 ° of direct current being superimposed with 6mA is induced by A type creepage mutual inductor is identical with ± 0 °, so the differentiations of these two kinds electric leakages are the same with ± 0 °.
Be the embodiment of the A type earth leakage protective device that electric leakage drop-away current value is consistent in sum; from flip-flop number; several electric leakage waveform detects successively within the following continuous print time period, does not interfere with each other, and achieves the consistent of A type leakage current drop-away current value.
Claims (7)
1. the A type earth leakage protective device that drop-away current value of leaking electricity is consistent, is characterized in that, comprises and be integrated in same chip:
Chopping zero-stabilizing operational amplifier, for reducing the offset voltage of cmos operational amplifier, amplifies A type leakage inductance induction signal;
Hysteresis comparator module, makes comparisons for the A type electric leakage signal after amplifying and different A type electric leakage signal comparative level, produces corresponding electric leakage and compares pulse;
Digital signal processing module, for identifying A type electric leakage signal, and produces trip signal;
There is the ring oscillator of tail current source, for generation of HF switch clock, for the modulation signal of chopping zero-stabilizing operational amplifier, as numerical portion clock signal after frequency division.
2. the A type earth leakage protective device that electric leakage drop-away current value as claimed in claim 1 is consistent; it is characterized in that; described A type earth leakage protective device is consistent to different A type leakage current drop-away current value; namely to current hysteresis relief angle ± 0 °, ± 90 °, the smooth direct current electricity of ± 135 ° and current hysteresis relief angle 0 ° superposition 6mA and the electric leakage of AC type, the effective value of drop-away current is consistent.
3. the A type earth leakage protective device that electric leakage drop-away current value as claimed in claim 1 is consistent, it is characterized in that, the A type leakage inductance induction signal that described A type creepage mutual inductor induces is faint, and voltage amplitude is 10mV-30mV, is applicable to CMOS integrated circuit.
4. the A type earth leakage protective device that electric leakage drop-away current value as claimed in claim 3 is consistent, it is characterized in that, the signal ripple after described chopping zero-stabilizing operational amplifier amplifies is 1-5mV.
5. the A type earth leakage protective device that electric leakage drop-away current value as claimed in claim 1 is consistent, it is characterized in that, described digital signal processing module comprises interference filtering module, A type electric leakage signal discrimination module, exports buffer module;
Described interference filtering module, for the shaking interference of filtering flip-flop number pulse; Described A type electric leakage signal discrimination module, for differentiating the classification of electric leakage signal, produces trip signal; Described output buffer module, for the thyristor of driving chip outside, produces tripping operation.
6. the A type earth leakage protective device that electric leakage drop-away current value as claimed in claim 5 is consistent, it is characterized in that, described A type electric leakage signal discrimination module is to the detection of the different leakage current type of A type, detect successively according to time sequencing, keep for be all sufficient the detection time of often kind of leakage current type, and have respective detection of electrical leakage level respectively, so there is not the problem interfered with each other; Because electric leakage signal detects within the time period, even if electric leakage waveform is not canonical form, this A type earth leakage protective device also can carry out detection of electrical leakage within the corresponding time period, improves the antijamming capability of A type earth leakage protective device.
7. the A type earth leakage protective device that electric leakage drop-away current value as claimed in claim 6 is consistent, it is characterized in that, described A type electric leakage signal discrimination module is superimposed with the A type electric leakage signal of the smooth direct current electricity of 6mA for+0 ° ,+90 ° ,+135 ° ,+0 ° after amplification, timing trigger impulse is produced through comparing with 2.5V hysteresis comparator, within beginning timing 3ms, have electric leakage signal pulse, then this electric leakage signal current hysteresis relief angle is+135 °; Within timing 3-7ms, have electric leakage signal pulse, then this electric leakage signal current hysteresis relief angle is+90 °; Within timing 7-12ms, have electric leakage signal pulse, then this electric leakage signal current hysteresis relief angle is+0 °, also comprises the smooth direct current electricity that+0 ° is superimposed with 6mA; After amplification-0 ° ,-90 ° ,-135 ° ,-0 ° is superimposed with to the A type electric leakage signal of the smooth direct current electricity of 6mA, timing trigger impulse is produced through comparing with 2.3V hysteresis comparator, within beginning timing 3ms, have electric leakage signal pulse, then this electric leakage signal current hysteresis relief angle is-135 °; Within timing 3-7ms, have electric leakage signal pulse, then this electric leakage signal current hysteresis relief angle is-90 °; Within timing 7-12ms, have electric leakage signal pulse, then this electric leakage signal current hysteresis relief angle is-0 °, also comprises the smooth direct current electricity that-0 ° is superimposed with 6mA; For the differentiation of AC type, the AC type electric leakage signal after amplification produces timing trigger impulse through comparing with 2.3V hysteresis comparator, in 3-7ms and 13-16ms, have leakage current pulse, then this electric leakage signal is the electric leakage of AC type; After 16ms, described digital signal processing module resets, and waits for the detection of electrical leakage of next cycle.
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| CN105406843A (en) * | 2015-12-09 | 2016-03-16 | 中国计量学院 | Four-path orthogonal signal generator with accurately-adjustable phase |
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| CN106410746A (en) * | 2016-05-31 | 2017-02-15 | 深圳巴斯巴科技发展有限公司 | A-type electric leakage circuit protector suitable for new energy automobile charging box |
| CN106451347A (en) * | 2016-12-19 | 2017-02-22 | 无锡万吉科技股份有限公司 | Pure direct-current leakage protection switch |
| CN108627788A (en) * | 2018-03-23 | 2018-10-09 | 宁波央腾汽车电子有限公司 | A kind of method and system of Hall current sensor magnetic hysteresis detection |
| CN110850140A (en) * | 2019-09-27 | 2020-02-28 | 温彦衫 | Current measurement method for leakage protection by using mutual inductor |
| CN110571756A (en) * | 2019-09-30 | 2019-12-13 | 浙江大学 | low-power consumption anti-interference A-type leakage protector |
| CN110571756B (en) * | 2019-09-30 | 2020-08-04 | 浙江大学 | Low-power consumption anti-interference A-type leakage protector |
| CN111208450A (en) * | 2020-01-20 | 2020-05-29 | 浙江大学 | Basic leakage detection chip of leakage protector |
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| CN112103913A (en) * | 2020-09-16 | 2020-12-18 | 上海谷为电子科技有限公司 | A-type leakage protection chip |
| CN114336519A (en) * | 2022-01-10 | 2022-04-12 | 无锡市晶源微电子有限公司 | Control circuit of leakage protector |
| CN114336519B (en) * | 2022-01-10 | 2023-08-22 | 无锡市晶源微电子股份有限公司 | Control circuit of leakage protector |
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