CN102931631B - Output earth leakage protection device for high-voltage and direct-current power supply system - Google Patents
Output earth leakage protection device for high-voltage and direct-current power supply system Download PDFInfo
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- CN102931631B CN102931631B CN201210458980.0A CN201210458980A CN102931631B CN 102931631 B CN102931631 B CN 102931631B CN 201210458980 A CN201210458980 A CN 201210458980A CN 102931631 B CN102931631 B CN 102931631B
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Abstract
The invention discloses an output earth leakage protection device for a high-voltage and direct-current power supply system. The output earth leakage protection device is characterized in that the output earth leakage protection device comprises a pulse generation circuit, a detection circuit and a protection circuit, wherein the detection circuit comprises a first earth leakage detection circuit and a second earth leakage detection circuit; in the first earth leakage detection circuit, an output anode of a high-voltage and direct-current power supply is opposite to a protective earth; in the second earth leakage detection circuit, a protective earth is opposite to an output cathode of the high-voltage direct-cirrent power supply; the first earth leakage detection circuit comprises a first switch circuit, a first earth leakage signal transduction circuit and a first electric isolation circuit; the second earth leakage detection circuit comprises a second switch circuit, a second earth leakage signal transduction circuit and a second electric isolation circuit; and the control protection circuit is used for outputting a shutdown signal for indicating the shutdown of the high-voltage and direct-current power supply system according to a signal of the first earth leakage signal transduction circuit or the second earth leakage signal transduction circuit. The output earth leakage protection device is controlled by hardware, so that the control response speed is high.
Description
Technical field
The present invention relates to a kind of earth leakage protective device, particularly a kind of output earth leakage protective device for high-voltage direct current (DC) power system.
Background technology
Along with the requirement of country to energy-saving and emission-reduction, high-voltage direct current (DC) power system is developed rapidly, meanwhile, also more and more higher to the requirement of power-supply system safe handling.At present, because high-voltage direct current (DC) power system output is generally floating ground mode, i.e. system output does not directly link together with ground, frame, shell, so can't detect electric leakage with traditional direct current electricity leakage sensor.
Therefore, how in high-voltage direct current (DC) power system, detecting leakage current is one of industry problem demanding prompt solution.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of output earth leakage protective device that can be used for being output as the high-voltage direct current (DC) power system of floating ground mode.
Technical scheme of the present invention is as follows:
An output earth leakage protective device for high-voltage direct current (DC) power system, is characterized in that described earth leakage protective device comprises: pulse-generating circuit, testing circuit and control protection electric circuit, described pulse-generating circuit is for producing the first pulse signal and the second pulse signal respectively, and described the first pulse signal and described the second pulse signal must not be high level simultaneously, described testing circuit comprise to the output cathode of described high-voltage DC power supply to the first electric-leakage detection circuit of ground wire and ground wire the second electric-leakage detection circuit to the output negative pole of described high-voltage DC power supply, described the first electric-leakage detection circuit comprises the first switch loop, the first electric leakage signal order wire circuit and the first electrical isolation circuit, described the second electric-leakage detection circuit comprises second switch loop, the second electric leakage signal order wire circuit and the second electrical isolation circuit, described the first pulse signal is controlled conducting and the cut-off in described the first switch loop, described the second pulse signal is controlled conducting and the cut-off in second switch loop, described control protection electric circuit, while leaking electricity between the output of described high-voltage DC power supply and ground wire for detecting at described testing circuit, according to the signal output of described the first electric leakage signal order wire circuit or the second electric leakage signal order wire circuit, be used to indicate the off signal of this high-voltage direct current (DC) power system shutdown.
Wherein, described the first electrical isolation circuit comprises that the first gas puts pipe and the first piezo-resistance, and described the second electrical isolation circuit comprises that the second gas is put and manages and the second piezo-resistance.
Wherein, described the first gas is put pipe and when cut-off state, is had physics breakpoint, and described the second gas is put pipe and when cut-off state, had physics breakpoint, makes described high-voltage DC power supply output have electrical isolation function with ground.
Wherein, described the first electric-leakage detection circuit also comprises the first current-limiting resistance of being series between described the first electrical isolation circuit and described the first electric leakage signal order wire circuit and the anti-reverse diode D1 between described the first electric leakage signal order wire circuit and described the first switch loop; Described the second electric-leakage detection circuit also comprises the second current-limiting resistance of being series between described the second electrical isolation circuit and described the second electric leakage signal order wire circuit and the anti-reverse diode D2 between described the second electric leakage signal order wire circuit and described second switch loop.
Wherein, described the first electric leakage signal order wire circuit comprises the first former limit of optocoupler and the first leakage current resistance that is connected in parallel on the first two ends, the former limit of optocoupler, and described the second electric leakage signal order wire circuit comprises the second former limit of optocoupler and is connected in parallel on the second leakage current resistance at the second two ends, the former limit of optocoupler.
Wherein, described control protection electric circuit comprises the first optical coupling secondary edges, the second optical coupling secondary edges and pull-up resistor R9; After described the first optical coupling secondary edges is in parallel with described the second optical coupling secondary edges, accessory power supply VDD is received by described pull-up resistor R9 in one end, the drop-down connected GND of the other end; Node between described pull-up resistor R9 and described the first optical coupling secondary edges, described the second optical coupling secondary edges is exported described off signal.
Wherein, described the first switch loop comprises described the first switching tube, and the control utmost point of described the first switching tube receives described the first pulse signal; Described second switch loop comprises described second switch pipe, and the control utmost point of described second switch pipe receives described the second pulse signal.
Wherein, described the first switching tube, described second switch pipe are metal-oxide-semiconductor; The control utmost point of described the first switching tube and the control of described second switch pipe is the G utmost point of metal-oxide-semiconductor very; Described the first switch loop also comprises that one for jamproof resistance R 4, and described resistance R 4 is connected in parallel between the G utmost point and the S utmost point of described the first switching tube Q1; Described second switch loop also comprises that one for jamproof resistance R 8, and described resistance R 8 is connected in parallel between the G utmost point and the S utmost point of described second switch pipe Q2.
In specific embodiments of the invention, after high-voltage direct current (DC) power system work, the first pulse signal PWM1 and the second pulse signal PWM2 are staggered issues pulse enable signal the first switch loop, second switch loop respectively in conducting and cut-off state.When there is the resistance of certain resistance or short circuit between output arbitrary utmost point and PE, export the testing circuit conducting between another utmost point and PE, in control protection electric circuit, export off signal.Owing to being hardware controls, so control response speed is fast.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of embodiment of the output earth leakage protective device of high-voltage direct current (DC) power system of the present invention.
Embodiment
Below in conjunction with Figure of description, the embodiment of the output earth leakage protective device of high-voltage direct current (DC) power system of the present invention is specifically described.
As shown in Figure 1; the embodiment of the output earth leakage protective device of high-voltage direct current (DC) power system of the present invention; for being output as the high-voltage direct current (DC) power system of floating ground mode, the embodiment of this device comprises: pulse-generating circuit 1, testing circuit 2 and control protection electric circuit 3.
Pulse-generating circuit is for producing the first pulse signal and the second pulse signal respectively, and described the first pulse signal and described the second pulse signal must not be high level simultaneously;
When the conducting of one of the first switch loop and described second switch loop; and the testing circuit at another place, switch loop in system output and PE between while there is a resistance; testing circuit 2 conductings; it controls above-mentioned control protection electric circuit 3 output module hardware off signal OFF, and this module hardware off signal is used to indicate this high-voltage direct current (DC) power system shutdown.
Preferably, described the first electric-leakage detection circuit 21 comprise be connected in series in successively output+and PE between element: the first gas is put pipe FDG1, the first piezo-resistance MOV1, current-limiting resistance R1, R2, the first optocoupler former limit OT1A, anti-reverse diode D1 and the first switching tube Q1.The control utmost point of the first switching tube Q1 is accepted above-mentioned the first pulse signal PWM1, and when the first switching tube Q1 is metal-oxide-semiconductor, it controls the utmost point is the G utmost point of metal-oxide-semiconductor.Preferably, the first OT1A two ends, the former limit of optocoupler a leakage current resistance R 3, for giving path of weak current signal, avoid the former limit OT1A of the first optocoupler to mislead.Preferably, when the first switching tube Q1 is metal-oxide-semiconductor, between its G utmost point and the S utmost point and one for jamproof resistance R 4.The first switching tube Q1 or the first switch Q1 and 4 of resistance R have formed above-mentioned the first switch loop.Wherein, anti-reverse diode D1 connects anti-misoperation and protection the first former limit of optocoupler OT1A reverse breakdown for anti-this testing circuit.Described the first gas is put pipe FDG1, the first piezo-resistance MOV1 for by electrical isolation between system output and PE, has formed the first electrical isolation circuit.The former limit OT1A of the first optocoupler and leakage current resistance R 3 have formed the first electric leakage signal order wire circuit.
Described the second electric-leakage detection circuit 22 comprise be connected in series in successively PE and output-between: the second gas is put pipe FDG2, the second piezo-resistance MOV2, current-limiting resistance R5, R6, the second optocoupler former limit OT2A, anti-reverse diode D2 and second switch pipe Q2.The control utmost point of second switch pipe Q2 is accepted above-mentioned the second pulse signal PWM2, and when second switch pipe Q2 is metal-oxide-semiconductor, it controls the utmost point is the G utmost point of metal-oxide-semiconductor.Preferably, the second OT2A two ends, the former limit of optocoupler a leakage current resistance R 7, for giving path of weak current signal, avoid the former limit OT2A of the second optocoupler to mislead.Preferably, when second switch pipe Q2 is metal-oxide-semiconductor, between its G utmost point and the S utmost point and an anti-interference resistance R 8.Second switch Q2, or second switch Q2 and resistance R 8 have formed above-mentioned second switch loop.Wherein, anti-reverse diode D2 connects anti-misoperation and protection the second former limit of optocoupler OT2A reverse breakdown for anti-this testing circuit.Described the second gas is put pipe FDG2, the second piezo-resistance MOV2 for by electrical isolation between system output and PE, has formed the second electrical isolation circuit.The former limit OT2A of the second optocoupler and leakage current resistance R 7 have formed the second electric leakage signal order wire circuit.
Control protection electric circuit 3 comprises the first optical coupling secondary edges OT1B, the second optical coupling secondary edges OT2B and pull-up resistor R9.As mentioned above, the former limit OT1A of the first optocoupler that the first optical coupling secondary edges OT1B is corresponding is connected with the first switch loop in testing circuit, and specifically the former limit OT1A of the first optocoupler connects with the first switching tube Q1; The former limit OT2A of the second optocoupler that the second optical coupling secondary edges OT2B is corresponding is connected with the second switch tube loop in testing circuit, and specifically the former limit OT2A of the second optocoupler connects with second switch pipe Q2.After the first optical coupling secondary edges OT1B is in parallel with the second optical coupling secondary edges OT2B, accessory power supply VDD is received by pull-up resistor R9 in one end, the drop-down connected GND of the other end.Node output module hardware off signal OFF between pull-up resistor R9 and the first optical coupling secondary edges OT1B, the second optical coupling secondary edges OT2B.
Preferably, the first switching tube Q1 and second switch pipe Q2 all adopt metal-oxide-semiconductor.
In above-mentioned embodiment, the control chip in the monitoring module of accessory power supply VDD and high-voltage direct current (DC) power system altogether.The first pulse signal PWM1 and the second pulse signal PWM2 must not be high level simultaneously at any time, that is, and and the first switching tube Q1 and second switch pipe Q2 conducting simultaneously.
Explain the operation principle of the embodiment of high-voltage direct current (DC) power system output electric leakage rapid protecting device of the present invention below.
As shown in Figure 1, high-voltage direct current (DC) power system opens machine, and the first pulse signal PWM1 and the second pulse signal PWM2 be staggered output low and high level successively, and the first pulse signal PWM1 and the second pulse signal PWM2 must not be high level simultaneously at any time.Above-mentioned the first switch loop and second switch loop alternate conduction, specifically, the first switching tube Q1 and second switch pipe Q2 alternate conduction.
When system is normally worked, the first switching tube Q1 and second day close pipe Q2 alternate conduction, but the first gas is put pipe FDG1 and the second gas is put pipe FDG2 all in cut-off state, because gas is put a physics breakpoint of pipe existence, two gas are put pipe and are had two physics breakpoints, electrical distance is increased, thereby reach the object of electrical isolation between system output and PE.
When the first switching tube Q1 cut-off, during second switch pipe Q2 conducting, if in output+exist a resistance value (as human body between to PE, output loading cable insulation skin is damaged, output+or output-to PE short circuit etc.), the output voltage of system be all added in the second gas put pipe FDG2 two ends (voltage is through the parasitic capacitance of the second piezo-resistance MOV2) make it conducting, then the second piezo-resistance MOV2 action, make the second former limit of optocoupler OT2A conducting, thereby the corresponding conducting of the second optical coupling secondary edges OT2B, accessory power supply VDD is through resistance R 9, the second optical coupling secondary edges OT2B of the second optical coupling secondary edges OT2B conducting is connected with GND, module hardware off signal OFF is drop-down is low level, module output shutdown, now, if output+when resistance between PE is disappeared or do not have resistance, the second gas is put pipe FDG2 in cut-off state, the former limit OT2A cut-off of the second optocoupler, module hardware off signal OFF is connected to high level through pull-up resistor R9 and VDD, and module output is normal.Acting as when the second gas of the second piezo-resistance MOV2 put and managed after FDG2 conducting; improve the second gas and put pipe FDG2 extinguishing voltage value; make reliably, fast and by mistake alarm of testing circuit, the second isolating diode D2 act as anti-reverse insulation blocking, and to the former frontier defense reverse breakdown of the second optocoupler.
In like manner, when the first switching tube Q1 conducting, and second switch pipe Q2 when cut-off, if PE to output-between there is a resistance value, the output voltage of system be all added in the first gas put pipe FDG1 two ends (voltage is through the parasitic capacitance of the first piezo-resistance MOV1) make it conducting, then the first piezo-resistance MOV1 action, make the first former limit of optocoupler OT1A conducting, the corresponding conducting of the first optical coupling secondary edges OT2B, VDD is connected with GND through the first optical coupling secondary edges OT1B of resistance R 9, conducting, module hardware off signal OFF is drop-down is low level, module output shutdown; Now, if PE to output-between resistance when disappearing or not having resistance, the first gas is put pipe FDG1 in cut-off state, the former limit OT1A cut-off of the first optocoupler, module hardware off signal OFF is connected to high level through pull-up resistor R9 and VDD, and module output is normal.Acting as when the first gas of the first piezo-resistance MOV1 put and managed after FDG1 conducting; improve the first gas and put pipe FDG1 extinguishing voltage value; make it reliably, fast and by mistake alarm of testing circuit, the first isolating diode D1 act as anti-reverse insulation blocking, simultaneously to the former frontier defense reverse breakdown of the first optocoupler.
Above-mentioned embodiment, after high-voltage direct current (DC) power system work, the first pulse signal PWM1 and the second pulse signal PWM2 are staggered issues pulse enable signal the first switching tube, second switch pipe respectively in conducting and cut-off state.When there is the resistance of certain resistance between the arbitrary utmost point of output and PE; the former limit conducting of the first optocoupler or the second optocoupler; the first optocoupler in control protection electric circuit or the secondary conducting of the second optocoupler, module hardware off signal is drop-down is low level, control module output shutdown.Owing to being hardware controls, so control response speed is very fast.
On the other hand; due to; when the first switch loop and second switch loop Zhong You mono-tunnel conducting; if access a resistance between the output of the system of the testing circuit at another place, switch loop and PE; for example, even if this resistance value is large (resistance of 80K Ω) very; but as long as form a path between system output and PE, the also conducting of testing circuit at the place, switch loop of above-mentioned conducting, now will trigger control protection electric circuit output module hardware off signal.Particularly, control the first optical coupling secondary edges OT1B or also conducting thereupon of the second optical coupling secondary edges OT2B in protection road, the low level of node output between pull-up resistor R9 and the first or second optical coupling secondary edges, thus trigger high-voltage direct current (DC) power system shutdown.Be understandable that thus; when no matter, between system output and PE, be conducting due to short circuit; or for example, owing to there being resistance access (: human body) or insulating barrier breakage and conducting; this earth leakage protective device all can detect; that is to say; its protection electric leakage minimum value is lower, and protection range is wider.Thus, can reach the object that personal safety is realized to protection.
To sum up, this device has fast response time, and detection range is wide, and accuracy of detection is good, and the advantage of output and the earth electrical isolation.
In a word, the foregoing is only the better embodiment of technical solution of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (7)
1. an output earth leakage protective device for high-voltage direct current (DC) power system, is characterized in that described earth leakage protective device comprises: pulse-generating circuit, testing circuit and control protection electric circuit;
Described pulse-generating circuit is for producing the first pulse signal and the second pulse signal respectively, and described the first pulse signal and described the second pulse signal must not be high level simultaneously;
The output cathode that described testing circuit comprises high-voltage DC power supply is the second electric-leakage detection circuit to the output negative pole of described high-voltage DC power supply to the first electric-leakage detection circuit of ground wire and ground wire, described the first electric-leakage detection circuit comprises the first switch loop, the first electric leakage signal order wire circuit and the first electrical isolation circuit, described the second electric-leakage detection circuit comprises second switch loop, the second electric leakage signal order wire circuit and the second electrical isolation circuit, described the first pulse signal is controlled conducting and the cut-off in described the first switch loop, described the second pulse signal is controlled conducting and the cut-off in second switch loop,
Described control protection electric circuit, while leaking electricity between the output of described high-voltage DC power supply and ground wire for detecting at described testing circuit, according to the signal output of described the first electric leakage signal order wire circuit or the second electric leakage signal order wire circuit, be used to indicate the off signal of this high-voltage direct current (DC) power system shutdown;
Described the first electrical isolation circuit comprises that the first gas puts pipe and the first piezo-resistance, and described the second electrical isolation circuit comprises that the second gas is put and manages and the second piezo-resistance.
2. the output earth leakage protective device of high-voltage direct current (DC) power system as claimed in claim 1; it is characterized in that: described the first gas is put pipe and when cut-off state, had physics breakpoint; described the second gas is put pipe and when cut-off state, is had physics breakpoint, makes described high-voltage DC power supply output have electrical isolation function with ground.
3. the output earth leakage protective device of high-voltage direct current (DC) power system as claimed in claim 1, is characterized in that:
Described the first electric-leakage detection circuit also comprises the first current-limiting resistance of being series between described the first electrical isolation circuit and described the first electric leakage signal order wire circuit and the anti-reverse diode D1 between described the first electric leakage signal order wire circuit and described the first switch loop;
Described the second electric-leakage detection circuit also comprises the second current-limiting resistance of being series between described the second electrical isolation circuit and described the second electric leakage signal order wire circuit and the anti-reverse diode D2 between described the second electric leakage signal order wire circuit and described second switch loop.
4. the output earth leakage protective device of high-voltage direct current (DC) power system as claimed in claim 1; it is characterized in that: described the first electric leakage signal order wire circuit comprises the first former limit of optocoupler and the first leakage current resistance that is connected in parallel on the first two ends, the former limit of optocoupler, described the second electric leakage signal order wire circuit comprises the second former limit of optocoupler and is connected in parallel on the second leakage current resistance at the second two ends, the former limit of optocoupler.
5. the output earth leakage protective device of high-voltage direct current (DC) power system as claimed in claim 4, is characterized in that:
Described control protection electric circuit comprises the first optical coupling secondary edges, the second optical coupling secondary edges and pull-up resistor R9; After described the first optical coupling secondary edges is in parallel with described the second optical coupling secondary edges, accessory power supply VDD is received by described pull-up resistor R9 in one end, the drop-down connected GND of the other end; Node between described pull-up resistor R9 and described the first optical coupling secondary edges, described the second optical coupling secondary edges is exported described off signal.
6. the output earth leakage protective device of high-voltage direct current (DC) power system as claimed in claim 1, is characterized in that:
Described the first switch loop comprises the first switching tube, and the control utmost point of described the first switching tube receives described the first pulse signal; Described second switch loop comprises second switch pipe, and the control utmost point of described second switch pipe receives described the second pulse signal.
7. the output earth leakage protective device of high-voltage direct current (DC) power system as claimed in claim 6, is characterized in that:
Described the first switching tube, described second switch pipe are metal-oxide-semiconductor; The control utmost point of described the first switching tube and the control of described second switch pipe is the G utmost point of metal-oxide-semiconductor very;
Described the first switch loop also comprises that one for jamproof resistance R 4, and described resistance R 4 is connected in parallel between the G utmost point and the S utmost point of described the first switching tube; Described second switch loop also comprises that one for jamproof resistance R 8, and described resistance R 8 is connected in parallel between the G utmost point and the S utmost point of described second switch pipe.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210458980.0A CN102931631B (en) | 2012-11-15 | 2012-11-15 | Output earth leakage protection device for high-voltage and direct-current power supply system |
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| CN201210458980.0A CN102931631B (en) | 2012-11-15 | 2012-11-15 | Output earth leakage protection device for high-voltage and direct-current power supply system |
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| CN102931631B true CN102931631B (en) | 2014-03-26 |
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| CN104143811B (en) * | 2014-07-15 | 2017-12-12 | 沈亚斌 | A kind of direct current leakage protective circuit |
| CN107294061B (en) * | 2017-06-26 | 2019-07-26 | 北京无线电测量研究所 | A kind of guard method of high voltage power supply electric leakage and device |
| CN117374899B (en) * | 2023-10-20 | 2024-04-30 | 中科智寰(北京)科技有限公司 | DC power grid feed-in protection device with lightning protection function |
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|---|---|---|---|---|
| CN201078757Y (en) * | 2006-10-23 | 2008-06-25 | 王�忠 | Electric leakage and electric larceny recognition indicating circuit for single phase AC power supply circuitry |
| CN201342951Y (en) * | 2008-11-12 | 2009-11-11 | 同济大学 | High-voltage leakage protection system capable of detecting leakages of two poles simultaneously for electric automobile |
| CN202373956U (en) * | 2011-12-23 | 2012-08-08 | 泰安众诚矿山自动化股份有限公司 | Leakage protection device for mine channel power device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201078757Y (en) * | 2006-10-23 | 2008-06-25 | 王�忠 | Electric leakage and electric larceny recognition indicating circuit for single phase AC power supply circuitry |
| CN201342951Y (en) * | 2008-11-12 | 2009-11-11 | 同济大学 | High-voltage leakage protection system capable of detecting leakages of two poles simultaneously for electric automobile |
| CN202373956U (en) * | 2011-12-23 | 2012-08-08 | 泰安众诚矿山自动化股份有限公司 | Leakage protection device for mine channel power device |
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