CN100533901C - Electrifying and switching on control method used for creepage protector - Google Patents
Electrifying and switching on control method used for creepage protector Download PDFInfo
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- CN100533901C CN100533901C CNB200710070506XA CN200710070506A CN100533901C CN 100533901 C CN100533901 C CN 100533901C CN B200710070506X A CNB200710070506X A CN B200710070506XA CN 200710070506 A CN200710070506 A CN 200710070506A CN 100533901 C CN100533901 C CN 100533901C
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Abstract
This invention relates to a switching-on control method for the earth leakage protective device (ELPD). When power supply interruption caused by the electric network being out of order, man power operation is needed for switching-on to supply power again. This invention steps are: the output is sustained high electric level from the production of rise-edge signal after the electric network re-supply of power, obtained is on/off position signal of the ELPD controlled with. If there is high electric level within 20mS after the production of rise-edge signal, the high electric level output is changed into low electric level output; if not, keeping the high electric level output. If there if high electric level after 20mS, the off-position of switch is determined, and then transmitted is on-switching signal, obtaining the on/off signal repeatedly, if there is low electric level signal, switching-on signal output is kept. This invention is the automatic switching control.
Description
Technical field
The present invention relates to a kind of combined floodgate control technology that powers on, be specifically related to a kind of electrifying and switching on control method that is used for earth leakage protective device.
Background technology
Total level earth leakage protective device is configured in the low pressure general supply side of distribution transforming as total protection of the whole network, and the selection of its residual operating current value to be preventing the electrical shock protection of indirect contact, and selects little under the prerequisite that escapes the normal leakage current of electrical network as far as possible.The monitoring of can leaking electricity to the electrical network in a big way of total level earth leakage protective device guarantees the fail safe and the reliability of interior operation of power networks in a big way.The total grade of earth leakage protective device that quite a few is arranged except disconnecting by the detection of electrical leakage function control switch, closure that can also control switch.But when electrical network broke down outage, earth leakage protective device also lost the power supply supply, can not work.At this moment the state of switch is indefinite, might be in off-state, also has to be in closure state.When power system restoration is powered,, so just must use artificial Closing Switch if switch is in off-state.And total level earth leakage protective device is generally installed to such an extent that relatively disperse, and need expend a large amount of manpower and materials like this.
Summary of the invention
Purpose of the present invention is exactly at the deficiencies in the prior art, proposes a kind of electrifying and switching on control method that is used for earth leakage protective device.Utilize this method when earth leakage protective device starts, (when grid cut-off restores electricity again) to judge the state of switch and to split to close and control.
The present invention includes following steps:
What produce when 1, detection of grid restores electricity is the rising edge signal of high level by low transition, if detect this rising edge signal, from detecting the high level that output constantly continues; If do not detect this rising edge signal, then continue to detect.
2, the switch state signal to the switch of earth leakage protective device control extracts, if switch disconnects, the switch state signal that extracts so is a low level signal; If switch is closed, the switch state signal that extracts so is the square-wave signal of 50Hz.
What 3, judge when power system restoration power generation is that the rising edge signal of high level begins constantly whether switch state signal has high level in back 20 milliseconds by low transition; If high level is arranged, then the output of the high level in the step 1 is converted to low level output; If there is not high level, then keep high level to continue output.
4, the level signal of 20 milliseconds of later steps 3 outputs of rising edge signal generation is judged,, judged that then switch is a closure state if should be low level constantly; If should be high level constantly, judge that then switch is an off-state, the output energization control signal.
5, the on off state behind the detection output energization control signal, repeating step 2 if the switch state signal that extracts is the square-wave signal of 50Hz, is then cancelled energization control signal; If the switch state signal that extracts is a low level signal, then keep energization control signal output.
The switch state signal of step 2 realizes that by the on off state extraction module function of this module is to detect and the extraction on off state: if switch disconnects, the signal of getting so is a low level signal; If switch is closed, the signal of getting so is the square-wave signal of 50Hz, and the cycle of the square-wave signal of 50Hz is 20 milliseconds, promptly has 10 milliseconds in 20 milliseconds and is in low level, and 10 milliseconds are in high level.
Step 3 is that what to judge when power system restoration power generation is that the rising edge signal of high level begins constantly whether switch state signal has high level in back 20 milliseconds by low transition, if high level is arranged, the switch state signal that promptly extracts is the square-wave signal of 50Hz, then the output of the high level in the step 1 is converted to low level output; If there is not high level, the switch state signal that promptly extracts is a low level signal, then keeps high level to continue output.Like this, step 3 is just handled the output of step 1 according to different on off states.
Step 4 is that the on off state of the switch of earth leakage protective device control is judged and exported energization control signal.The level signal that the rising edge signal is produced 20 milliseconds of later step 3 outputs is judged, if should be low level constantly, judges that then switch is a closure state; If should be high level constantly, judge that then switch is an off-state, the output energization control signal.
Step 5 detects the on off state behind the output energization control signal, and repeating step 2 if the switch state signal that extracts is the square-wave signal of 50Hz, is then cancelled energization control signal; If the switch state signal that extracts is a low level signal, then keep energization control signal output.So just finished the whole flow process of the closing function that powers on.
The present invention can (when powering on) judge the on off state that extracts and split the pass according to the result who judges and control when power system restoration be powered: switch disconnects when powering on if judge, then export energization control signal, Closing Switch, and confirming to cancel energization control signal behind the switch closure; If switch is closed when powering on, does not then split to close and control.Utilize the inventive method can be when earth leakage protective device starts judge the state of switch and split to close and control automatically.
Description of drawings
Fig. 1. the flow chart of energization control signal among the present invention;
Fig. 2. the circuit theory diagrams of one embodiment of the invention;
Fig. 3. switch disconnected the transmission path node waveform of embodiment when one of the present invention powered on;
Fig. 4. the transmission path node waveform of switch closure embodiment when one of the present invention powers on.
Embodiment
Fig. 1 is the flow chart of energization control signal in the inventive method.The inventive method is how judgement is handled and made to the switch state signal that extracts as can see from Figure 1, the output energization control signal.Concrete steps: what produce when 1, detection of grid restores electricity is the rising edge signal of high level by low transition, if detect this rising edge signal, from detecting the high level that output constantly continues; If do not detect this rising edge signal, then continue to detect; 2, the switch state signal to the switch of earth leakage protective device control extracts, if switch disconnects, the switch state signal that extracts so is a low level signal; If switch is closed, the switch state signal that extracts so is the square-wave signal of 50Hz; What 3, judge when power system restoration power generation is that the rising edge signal of high level begins constantly whether switch state signal has high level in back 20 milliseconds by low transition; If high level is arranged, then the output of the high level in the step 1 is converted to low level output; If there is not high level, then keep high level to continue output; 4, the level signal of 20 milliseconds of later steps 3 outputs of rising edge signal generation is judged,, judged that then switch is a closure state if should be low level constantly; If should be high level constantly, judge that then switch is an off-state, the output energization control signal; 5, the on off state behind the detection output energization control signal, repeating step 2 if the switch state signal that extracts is the square-wave signal of 50Hz, is then cancelled energization control signal; If the switch state signal that extracts is a low level signal, then keep energization control signal output.
Fig. 2 is the circuit block diagram of an embodiment of the inventive method.The utilization rising edge testing circuit detection of grid that powers on restores electricity moment of (powering on); utilize on off state to extract the on off state of the switch of circuit extraction earth leakage protective device control; utilize d type flip flop and high level time decision circuitry to come switch state signal is judged and handled, finally export energization control signal.
Fig. 3 be one of the present invention when powering on switch disconnect the transmission path node waveform of embodiment, waveform a is the inter-process signal that powers on and provide when the rising edge testing circuit detects power system restoration power supply (powering on); Waveform b is the waveform that on off state extracts the on off state that circuit extraction arrives, because switch disconnects powering on constantly, then the on off state that extracts at this moment is a low level; Waveform c is the output signal of d type flip flop module; Waveform d is an energization control signal, and as can be seen from the figure, after the high level time of the output signal of d type flip flop module had reached 20 milliseconds, energization control signal just became high level, and the control peripheral components is with switch closure.Passed through after one period reaction time switch closure when the k point, what this moment, the on off state extraction module extracted is the square-wave signal of 50Hz, shown in the second half section of waveform b among Fig. 3, when high level appears in waveform b, waveform c (output signal of d type flip flop module) becomes low level, energization control signal also correspondingly becomes low level, and like this, the production process of the energization control signal of the embodiment that switch disconnects when powering on has just been finished.
Fig. 4 is the transmission path node waveform of one of the present invention switch closure embodiment when powering on, and waveform a is the inter-process signal that powers on and provide when the rising edge testing circuit detects power system restoration power supply (powering on); Waveform b is the waveform of on off state extraction module, because switch is closed when powering on, then the on off state that extracts this moment is the square-wave signal of 50Hz; Waveform c is the output signal of d type flip flop module, because high level has appearred in switch state signal in 20 milliseconds, so waveform c has just become low level signal by high level signal in 20 milliseconds; Waveform d is an energization control signal, and as we can see from the figure, because the high level time of the output signal (waveform c) of d type flip flop module does not reach 20 milliseconds, energization control signal all keeps low level always, does not split to close and controls.Waveform e is if the output waveform of waveform c energization control signal when continuing high level because this situation is non-existent in the present embodiment, so dot, plays the function of comparing with waveform d.
Claims (1)
1, a kind of electrifying and switching on control method that is used for earth leakage protective device is characterized in that this method may further comprise the steps:
What produce when (1) detection of grid restores electricity is the rising edge signal of high level by low transition, if detect this rising edge signal, from detecting the high level that output constantly continues; If do not detect this rising edge signal, then continue to detect;
(2) switch state signal to the switch of earth leakage protective device control extracts, if switch disconnects, the switch state signal that extracts so is a low level signal; If switch is closed, the switch state signal that extracts so is the square-wave signal of 50Hz;
What (3) judge when power system restoration power generation is that the rising edge signal of high level begins constantly whether switch state signal has high level in back 20 milliseconds by low transition; If high level is arranged, then the output of the high level in the step 1 is converted to low level output; If there is not high level, then keep high level to continue output;
(4) level signal of rising edge signal 20 milliseconds of later steps of generation (3) output is judged,, judged that then switch is a closure state if should be low level constantly; If should be high level constantly, judge that then switch is an off-state, the output energization control signal;
(5) on off state behind the detection output energization control signal, repeating step (2) if the switch state signal that extracts is the square-wave signal of 50Hz, is then cancelled energization control signal; If the switch state signal that extracts is a low level signal, then keep energization control signal output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200710070506XA CN100533901C (en) | 2007-08-16 | 2007-08-16 | Electrifying and switching on control method used for creepage protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200710070506XA CN100533901C (en) | 2007-08-16 | 2007-08-16 | Electrifying and switching on control method used for creepage protector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101132128A CN101132128A (en) | 2008-02-27 |
| CN100533901C true CN100533901C (en) | 2009-08-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB200710070506XA Expired - Fee Related CN100533901C (en) | 2007-08-16 | 2007-08-16 | Electrifying and switching on control method used for creepage protector |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102411324A (en) * | 2010-09-21 | 2012-04-11 | 林进益 | Electromagnetic system |
| CN107229015B (en) * | 2016-04-29 | 2020-03-24 | 上海良信电器股份有限公司 | Detection method for recognizing initial power-on of system power supply voltage |
| CN106248218A (en) * | 2016-08-31 | 2016-12-21 | 宁波智轩物联网科技有限公司 | A kind of human body detection device and determination methods thereof |
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Granted publication date: 20090826 Termination date: 20120816 |