CN104300494B - The consistent A type earth leakage protective devices of drop-away current value of leaking electricity - Google Patents
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Abstract
The invention discloses the consistent A type earth leakage protective devices of electric leakage drop-away current value, including the chopping zero-stabilizing operational amplifier of same chip is integrated in, the offset voltage for reducing cmos operational amplifier, amplification A type electric leakage induced signals；Hysteresis comparator, makes comparisons for the A types electric leakage signal after amplification and different A types electric leakage signal comparative levels, produces corresponding electric leakage and compares pulse；Digital signal processing module is used to recognize A type electric leakage signals, and produces trip signal；Ring oscillator with tail current source is used to provide modulated signal to chopping zero-stabilizing operational amplifier, and clock is provided for digital signal processing module.The present invention can effectively prevent A type earth leakage protective devices by false triggering; since triggering timing; several electric leakage waveforms are detected successively within the following continuous period; it does not interfere with each other; even if the waveform that leaks electricity is not canonical form; the detection of period also improves earth leakage protective device antijamming capability, realizes the consistent of electric leakage drop-away current value, the prospect applied with market.
Description
Technical field
The present invention relates to IC design field, more particularly to the consistent A type earth leakage protectives of A types electric leakage drop-away current value
Device.
Background technology
With the progress of science and technology and continuing to develop for economy, the living standard of people has large increase, and electricity consumption is set
It is standby to become increasingly complex, especially with the electrical equipment of a large amount of electronic components.Such as computer, teleworking utensil and household electrical appliance
Etc. increasing, occurs non-sine exchange residual current in electric wiring also more and more.Traditional AC type residual current protectings
Device can only ensure the remaining simple sinusoidal alternating current for applying or slowly rising suddenly to thread off, therefore common AC types residual current is protected
Shield device can not meet requirement.
A type earth leakage protective devices are equal to application suddenly or the electric leakage simple sinusoidal alternating current and pulsating direct current electric current that slowly rise
It can ensure that the earth leakage protective device reliably threaded off.Its Cleaning Principle is all detected as AC types using leakage current transformer
Residual current, but the magnetic characteristic of transformer is improved, to improve the detection sensitivity to pulsating direct current electric current.
Human electric shock, electrical equipment damage, electrical fire that DC pulse electric leakage triggers etc. happens occasionally, and causes this not
The casualties and property loss of the generation, have caused government department and the great attention of people in the industry.Wideling popularize makes
It is imperative with A type earth leakage protective devices.
Publication No. CN102130440A Chinese patent literature discloses A type earth leakage protective device application specific integrated circuit cores
Piece, the chip to A types leak electricity species judgement it is excessively simple, and different types of A types electric leakage drop-away current value discreteness compared with
Greatly, it is impossible to meet the actual requirement consistent to drop-away current value, cause A type earth leakage protective device antijamming capabilities weak, be not suitable for throwing
Enter market application.
The content of the invention
The present invention proposes the consistent A type earth leakage protective devices of electric leakage drop-away current value.
The consistent A type earth leakage protective devices of drop-away current value of leaking electricity, it is characterised in that including being integrated in same chip：
Chopping zero-stabilizing operational amplifier, the offset voltage for reducing cmos operational amplifier, amplification A types leakage inductance should be believed
Number；
Hysteresis comparator module, makees to compare for the A types electric leakage signal after amplification and different A types electric leakage signal comparative levels
Compared with pulse is compared in the corresponding electric leakage of generation；
Digital signal processing module, for recognizing A type electric leakage signals, and produces trip signal；
Ring oscillator with tail current source, for producing HF switch clock, for chopping zero-stabilizing operational amplifier
Modulated signal, it is divided after be used as numerical portion clock signal.
Described A types earth leakage protective device is consistent to different A types leakage current drop-away current values, i.e., to electric current angle of lag ±
0 °, ± 90 °, ± 135 ° and 0 ° of electric current angle of lag superposition 6mA of smooth direct current electricity and the electric leakage of AC types, drop-away current it is effective
Value is consistent.
The A types electric leakage induced signal that described A type creepage mutual inductors are induced is faint, and voltage amplitude is 10mV-20mV,
Suitable for CMOS integrated circuits.
Signal ripple after described A types electric leakage induced signal amplifies through the chopping zero-stabilizing operational amplifier is 1-5mV.
Described digital signal processing module includes interference filtering module, A type electric leakage signals discrimination module, output buffer module.
The interference filtering module, the shaking interference for filtering out flip-flop number pulse；The A types electric leakage signal discrimination module, is used for
Differentiate the classification of electric leakage signal, produce trip signal；The output buffer module, for the IGCT outside driving chip, production
Raw tripping operation.
Detection of the A types electric leakage signal discrimination module to the different leakage current type of A types, is sequentially in time successively
Detection, the detection time for keeping for every kind of leakage current type is all sufficient, and has respective detection of electrical leakage electricity respectively
It is flat, so in the absence of the problem of interfering with each other.Because electric leakage signal was detected within the period, even if electric leakage waveform is not standard
Form, the A types earth leakage protective device can also carry out detection of electrical leakage within the corresponding period, improve the anti-of A type earth leakage protective devices
Interference performance.
The A types electric leakage signal discrimination module is superimposed with the smooth of 6mA for+0 ° after amplification ,+90 ° ,+135 ° ,+0 °
The A type electric leakage signals of direct current, by compared with 2.5V hysteresis comparators produce timing trigger pulse, when start timing 3ms with
Inside there is electric leakage signal pulse, then this electric leakage signal electric current angle of lag is+135 °；There is electric leakage signal pulse within timing 3-7ms,
Then this electric leakage signal electric current angle of lag is+90 °；There is electric leakage signal pulse within timing 7-12ms, then this electric leakage signal electric current
Angle of lag is+0 °, also electric including+0 ° of smooth direct current for being superimposed with 6mA；For -0 ° after amplification, -90 °, -135 °, -0 ° of superposition
The A type electric leakage signals of upper 6mA smooth direct current electricity, produce timing trigger pulse, when opening by being compared with 2.3V hysteresis comparators
There is electric leakage signal pulse within beginning timing 3ms, then this electric leakage signal electric current angle of lag is -135 °；There is leakage within timing 3-7ms
Electric signal pulse, then this electric leakage signal electric current angle of lag is -90 °；There is electric leakage signal pulse within timing 7-12ms, then this leaks
Quiescent current angle of lag is -0 °, also electric including -0 ° of smooth direct current for being superimposed with 6mA；For the differentiation of AC types, after amplification
AC types electric leakage signal has leakage by being compared generation timing trigger pulse with 2.3V hysteresis comparators in 3-7ms and 13-16ms
Electric pulse, then this electric leakage signal is the electric leakage of AC types；After 16ms, described digital signal processing module resets, and waits next cycle
Detection of electrical leakage.
Compared to prior art, beneficial effects of the present invention are that different types of A types electric leakage signal can be carried out accurate
Judge, reduce A type earth leakage protective device drop-away current value discretenesses, realize the one of different A types leakage current drop-away current values
Cause, improve the antijamming capability of A type earth leakage protective devices, be more suitable for the application that puts goods on the market.
Brief description of the drawings
Figure 1A is the different A types electric leakage signal waveform diagrams of traditional A types earth leakage protective device；
Figure 1B is the drop-away current value figure of traditional A types earth leakage protective device；
Fig. 2 is the structured flowchart of the consistent A type earth leakage protective devices of present invention electric leakage 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 ° of electric leakage waveform of A types of the present invention differentiates；
The test waveform that Fig. 6 leaks electricity for+0 ° of A types of the present invention；
Fig. 7 is the process that+90 ° of electric leakage waveforms of A types of the present invention differentiate；
The test waveform that Fig. 8 leaks electricity for+90 ° of A types of the present invention；
Fig. 9 is the process that+135 ° of electric leakage waveforms of A types of the present invention differentiate；
The test waveform that Figure 10 leaks electricity for+135 ° of A types of the present invention；
Figure 11 is the process that -0 ° of electric leakage waveform of A types of the present invention differentiates；
The test waveform that Figure 12 leaks electricity for -0 ° of A types of the present invention；
Figure 13 is the process that -90 ° of electric leakage waveforms of A types of the present invention differentiate；
The test waveform that Figure 14 leaks electricity for -90 ° of A types of the present invention；
Figure 15 is the process that -135 ° of electric leakage waveforms of A types of the present invention differentiate；
The test waveform that Figure 16 leaks electricity for -135 ° of A types of the present invention；
Figure 17 is the process that A types ac leakage waveform of the present invention differentiates；
Figure 18 is the test waveform of A types ac leakage of the present invention.
Embodiment
The A type earth leakage protective device consistent to present invention electric leakage drop-away current value is described in detail below.
According to the relevant regulations of standard GB/T 16916.1-2003, GB16917.1-2003, the residue pulsating direct current of A types is total to
It is divided into 7 kinds of situations：Electric current angle of lag ± 0 °, ± 90 °, ± 135 ° and 0 ° of electric current angle of lag are superimposed 6mA smooth direct current electricity, ripple
Shape is shown in Figure 1A.The drop-away current scope of corresponding A type earth leakage protective devices as shown in Figure 1B, wherein,I Δn For specified action
Electric current.
The drop-away current value of A types earth leakage protective device has certain range intervals it can be seen from Figure 1B, in order to prevent A types
Earth leakage protective device false triggering, strengthens the antijamming capability of A type earth leakage protective devices, and various drop-away current values should be designed as unanimously,
The action current value of chip is set to 30mA by we.Leakage current passes through current transformer, by adjusting sampling resistor, 30mA
Electric leakage be converted to 30mV voltage signal.This voltage feeding A types earth leakage protective device carries out detection of electrical leakage.
The structured flowchart of the consistent A type earth leakage protective devices of electric leakage drop-away current value is illustrated in figure 2, it includes being integrated in together
One chip：
Chopping zero-stabilizing operational amplifier, the offset voltage for reducing cmos operational amplifier, amplification A types leakage inductance should be believed
Number, as shown in Figure 3（Vbias1, vbias2, vbias3, vbias4 are amplifier bias voltage）；
Hysteresis comparator module, makees to compare for the A types electric leakage signal after amplification and different A types electric leakage signal comparative levels
Compared with pulse is compared in the corresponding electric leakage of generation；
Digital signal processing module, for recognizing A type electric leakage signals, and produces trip signal；
Ring oscillator module with tail current source, the high frequency clk and nclk for producing 2.56MHz is steady to copped wave
Zero operational amplifier makees switch controlling signal, after the high frequency is divided through 64, provides clock for digital signal processing module, as shown in Figure 4.
In actual design, the frequency of high-frequency signal for megahertz, as long as frequency dividing ratio, which reaches, is suitable as digital module clock.
Digital signal processing module includes 0.5ms interference filtering modules, the shaking interference for filtering out flip-flop number pulse, interference
Filter out time 0.3-0.5ms；
A type electric leakage signal discrimination modules, the classification for differentiating electric leakage signal produces trip signal；
Buffer module is exported, for the IGCT outside driving chip, tripping operation is produced.
The course of work of the consistent A type earth leakage protective devices of electric leakage drop-away current value is described more detail below.
It is illustrated in figure 5+0 ° of earth leakage protective process.Chopping zero-stabilizing operational amplifier amplification after A types electric leakage signal first with
2.5V datums produce through hysteresis comparator and count trigger pulse, are counting in the 7ms-12ms started, if electric leakage is compared
Occur compared with pulse, then illustrate to occur in that+0 ° of electric leakage in circuit, and virtual value has reached 30mA, A type earth leakage protective device chips
High level pulse is exported, IGCT is triggered, protected circuit is disconnected, personal safety is protected.Digital signal processing module is answered after 16ms
Position, waits the detection of electrical leakage in next cycle.Fig. 6 gives the test result of+0 ° of electric leakage, in figure above waveform for after amplification+
0 ° of electric leakage signal, below waveform be chip export trip signal.
It is illustrated in figure 7+90 ° of earth leakage protective processes.Chopping zero-stabilizing operational amplifier amplification after A types electric leakage signal first with
2.5V datums produce through hysteresis comparator and count trigger pulse, are counting in the 3ms-7ms started, if electric leakage is compared
Pulse occurs, then illustrates to occur in that+90 ° of electric leakages in circuit, and virtual value has reached 30mA, A type earth leakage protective device chips
High level pulse is exported, IGCT is triggered, protected circuit is disconnected, personal safety is protected.Digital signal processing module is answered after 16ms
Position, waits the detection of electrical leakage in next cycle.Fig. 8 gives the test results of+90 ° of electric leakages, in figure above waveform for after amplification+
90 ° electric leakage waveforms, below waveform be chip export trip signal.
It is illustrated in figure 9+135 ° of earth leakage protective processes.A types electric leakage signal after chopping zero-stabilizing operational amplifier amplification is first
Produced with 2.5V datums through hysteresis comparator and count trigger pulse, counted in the 3ms started, if arteries and veins is compared in electric leakage
Go out now, then illustrate to occur in that+135 ° of electric leakages in circuit, and virtual value has reached 30mA, and A type earth leakage protective device chips are defeated
Go out high level pulse, trigger IGCT, disconnect protected circuit, protect personal safety.Digital signal processing module resets after 16ms,
Wait the detection of electrical leakage in next cycle.Figure 10 gives the test results of+135 ° of electric leakages, in figure above waveform for after amplification+
135 ° electric leakage waveforms, below waveform be chip export trip signal.
It is as shown in figure 11-0 ° of earth leakage protective process.Chopping zero-stabilizing operational amplifier amplification after A types electric leakage signal first with
2.3V datums produce through hysteresis comparator and count trigger pulse, are counting in the 7ms-12ms started, if electric leakage is compared
Occur compared with pulse, then illustrate to occur in that -0 ° of electric leakage in circuit, and virtual value has reached 30mA, A type earth leakage protective device chips
High level pulse is exported, IGCT is triggered, protected circuit is disconnected, personal safety is protected.Digital signal processing module is answered after 16ms
Position, waits the detection of electrical leakage in next cycle.Figure 12 gives the test result of -0 ° of electric leakage, in figure above waveform for after amplification -
0 ° electric leakage waveform, below waveform be chip export trip signal.
It is as shown in figure 13-90 ° of earth leakage protective processes.A types electric leakage signal after chopping zero-stabilizing operational amplifier amplification is first
Produced with 2.3V datums through hysteresis comparator and count trigger pulse, counted in the 3ms-7ms started, if electric leakage is compared
Occur compared with pulse, then illustrate to occur in that -90 ° of electric leakages in circuit, and virtual value has reached 30mA, A type earth leakage protective device cores
Piece exports high level pulse, triggers IGCT, disconnects protected circuit, protects personal safety.The digital signal processing module after 16ms
Reset, wait the detection of electrical leakage in next cycle.It is after amplifying that Figure 14, which gives waveform above in the test result of -90 ° of electric leakages, figure,
- 90 ° electric leakage waveforms, below waveform be chip export trip signal.
It is as shown in figure 15-135 ° of earth leakage protective processes.A types electric leakage signal after chopping zero-stabilizing operational amplifier amplification is first
Produced with 2.3V datums through hysteresis comparator and count trigger pulse, counted in the 3ms started, if arteries and veins is compared in electric leakage
Go out now, then illustrate to occur in that -135 ° of electric leakages in circuit, and virtual value has reached 30mA, and A type earth leakage protective device chips are defeated
Go out high level pulse, trigger IGCT, disconnect protected circuit, protect personal safety.Digital signal processing module resets after 16ms,
Wait the detection of electrical leakage in next cycle.Figure 16 gives the test results of -135 ° of electric leakages, in figure above waveform for after amplification -
135 ° electric leakage waveforms, below waveform be chip export trip signal.
It is AC type earth leakage protective processes as shown in figure 17.A types electric leakage signal after chopping zero-stabilizing operational amplifier amplification is first
Timing trigger pulse is produced through hysteresis comparator with 2.5V datums, has electric leakage to compare pulse in 3-7ms and 13-16ms
Occur, then illustrate to occur in that AC types leak electricity in circuit, and virtual value has reached 30mA, the output of A type earth leakage protective devices chip
High level pulse, triggers IGCT, disconnects protected circuit, protects personal safety.Digital signal processing module resets after 16ms, etc.
Treat the detection of electrical leakage in next cycle.It is the AC types after amplification that Figure 18, which gives waveform above in the test result of AC types electric leakage, figure,
Leak electricity waveform, below waveform be chip export trip signal.
The electric leakage waveform that ± 0 ° of DC current for being superimposed with 6mA is induced by A type creepage mutual inductors is identical with ± 0 °,
So the differentiation of both electric leakages and ± 0 °.
It is in summary the embodiment of the consistent A type earth leakage protective devices of electric leakage drop-away current value, from flip-flop number
Start, several electric leakage waveforms are detected successively within the following continuous period, are not interfere with each other, and are realized A types leakage current and are taken off
Detain the consistent of current value.
Claims (6)
1. a kind of consistent A type earth leakage protective devices of drop-away current value that leak electricity, it is characterised in that including being integrated in same chip：
Chopping zero-stabilizing operational amplifier, the offset voltage for reducing cmos operational amplifier, amplification A type electric leakage induced signals；
Hysteresis comparator module, is compared generation for the A types electric leakage induced signal after amplification with datum 2.3V or 2.5V
Triggering timing pulse, compares generation electric leakage from different A types electric leakage comparative level and compares pulse；
Digital signal processing module, for recognizing A types electric leakage induced signal, and produces trip signal；Described digital signal processing module bag
Include interference filtering module, A type electric leakage signals discrimination module, output buffer module；The interference filtering module, for filtering out triggering
The shaking interference of count pulse；The A types electric leakage signal discrimination module, the classification for differentiating electric leakage signal produces tripping operation letter
Number；The output buffer module, for the IGCT outside driving chip, produces tripping operation；
Ring oscillator with tail current source, for producing HF switch clock, the tune for chopping zero-stabilizing operational amplifier
Signal processed, it is divided after be used as numerical portion clock signal.
2. the consistent A type earth leakage protective devices of drop-away current value of leaking electricity as claimed in claim 1, it is characterised in that described A types
Earth leakage protective device is consistent to different A types leakage current drop-away current values, i.e., to electric current angle of lag ± 0 °, ± 90 °, ± 135 ° and
0 ° of superposition 6mA of electric current angle of lag smooth direct current electricity and the electric leakage of AC types, the virtual value of drop-away current are consistent.
3. the consistent A type earth leakage protective devices of drop-away current value of leaking electricity as claimed in claim 1, it is characterised in that the electric leakage of A types is mutual
The A types electric leakage induced signal that sensor is induced is faint, and voltage amplitude is 10mV-30mV, it is adaptable to CMOS integrated circuits.
4. the consistent A type earth leakage protective devices of drop-away current value of leaking electricity as claimed in claim 3, it is characterised in that cut described in
Signal ripple after the steady zero operational amplifier amplification of ripple is 1-5mV.
5. the consistent A type earth leakage protective devices of drop-away current value of leaking electricity as claimed in claim 1, it is characterised in that the A types leakage
Detection of the electric signal discrimination module to the different leakage current types of A types, detects, keeps for every kind of successively sequentially in time
The detection time of leakage current type is all sufficient, and has respective detection of electrical leakage level respectively, so in the absence of mutual
The problem of interference；Because electric leakage signal was detected within the period, even if electric leakage waveform is not canonical form, A types electric leakage is protected
Shield device can also carry out detection of electrical leakage within the corresponding period, improve the antijamming capability of A type earth leakage protective devices.
6. the consistent A type earth leakage protective devices of drop-away current value of leaking electricity as claimed in claim 5, it is characterised in that the A types leakage
The A types electric leakage that electric signal discrimination module is superimposed with 6mA smooth direct current electricity for+0 ° after amplification ,+90 ° ,+135 ° ,+0 ° is believed
Number, timing trigger pulse is produced by being compared with 2.5V hysteresis comparators, has electric leakage signal pulse within beginning timing 3ms,
Then this electric leakage signal electric current angle of lag is+135 °；There is electric leakage signal pulse within timing 3-7ms, then this electric leakage signal electric current
Angle of lag is+90 °；There is electric leakage signal pulse within timing 7-12ms, then this electric leakage signal electric current angle of lag is+0 °, or+0 °
It is superimposed with 6mA smooth direct current electricity；The A of 6mA smooth direct current electricity is superimposed with for -0 ° after amplification, -90 °, -135 °, -0 °
Type electric leakage signal, timing trigger pulse is produced by being compared with 2.3V hysteresis comparators, is believed when starting to have within timing 3ms to leak electricity
Feel the pulse punching, then this electric leakage signal electric current angle of lag is -135 °；There is electric leakage signal pulse within timing 3-7ms, then this electric leakage letter
Number electric current angle of lag is -90 °；Have electric leakage signal pulse within timing 7-12ms, then this electric leakage signal electric current angle of lag for-
0 °, or -0 ° of smooth direct current electricity for being superimposed with 6mA；For the differentiation of AC types, the AC types electric leakage signal after amplification passes through slow with 2.3V
Stagnant comparator compares generation timing trigger pulse, there is leakage current pulse in 3-7ms and 13-16ms, then this electric leakage signal is AC
Type leaks electricity；After 16ms, described digital signal processing module resets, and waits the detection of electrical leakage of next cycle.
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| CN105406843B (en) * | 2015-12-09 | 2018-01-16 | 中国计量学院 | A kind of accurate adjustable four road orthogonal signal generator of phase |
| 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 |
| CN108627788B (en) * | 2018-03-23 | 2021-01-22 | 宁波央腾汽车电子有限公司 | Hall current sensor hysteresis detection method and system |
| CN110850140A (en) * | 2019-09-27 | 2020-02-28 | 温彦衫 | Current measurement method for leakage protection by using mutual inductor |
| CN110571756B (en) * | 2019-09-30 | 2020-08-04 | 浙江大学 | Low-power consumption anti-interference A-type leakage protector |
| CN111208450B (en) * | 2020-01-20 | 2020-12-08 | 浙江大学 | Basic leakage detection chip of leakage protector |
| 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 |
| 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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