CN105162080B - Inductive load low-voltage protection circuit and protection method - Google Patents
Inductive load low-voltage protection circuit and protection method Download PDFInfo
- Publication number
- CN105162080B CN105162080B CN201510482055.5A CN201510482055A CN105162080B CN 105162080 B CN105162080 B CN 105162080B CN 201510482055 A CN201510482055 A CN 201510482055A CN 105162080 B CN105162080 B CN 105162080B
- Authority
- CN
- China
- Prior art keywords
- voltage
- low
- detection unit
- unit
- resistance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 230000001939 inductive effect Effects 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000001514 detection method Methods 0.000 claims abstract description 84
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 15
- 238000005070 sampling Methods 0.000 claims description 15
- 229910052710 silicon Inorganic materials 0.000 claims description 15
- 239000010703 silicon Substances 0.000 claims description 15
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 230000005611 electricity Effects 0.000 claims description 9
- 239000003990 capacitor Substances 0.000 claims description 6
- 238000010891 electric arc Methods 0.000 claims description 6
- 230000004044 response Effects 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 2
- 241000208340 Araliaceae Species 0.000 claims 1
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 claims 1
- 235000003140 Panax quinquefolius Nutrition 0.000 claims 1
- 235000008434 ginseng Nutrition 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 3
- 101100328518 Caenorhabditis elegans cnt-1 gene Proteins 0.000 description 6
- 101100328519 Caenorhabditis elegans cnt-2 gene Proteins 0.000 description 5
- 101000685663 Homo sapiens Sodium/nucleoside cotransporter 1 Proteins 0.000 description 4
- 102100023116 Sodium/nucleoside cotransporter 1 Human genes 0.000 description 4
- 230000000295 complement effect Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000005284 excitation Effects 0.000 description 3
- 230000002964 excitative effect Effects 0.000 description 3
- 101000821827 Homo sapiens Sodium/nucleoside cotransporter 2 Proteins 0.000 description 1
- 102100021541 Sodium/nucleoside cotransporter 2 Human genes 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000003679 aging effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a low-voltage protection circuit and a protection method for an inductive load, belongs to the field of low-voltage protection for the inductive load, and is designed for solving the problems of poor accuracy and the like in the prior art. The inductive load low-voltage protection circuit at least comprises a direct-current power supply output unit, a processor unit, a low-voltage over-current detection unit and a release driving unit; the direct-current power supply output unit respectively provides power for the processor unit and the low-voltage over-current detection unit; the processor unit is used for controlling the operation process of the protection circuit; the low-voltage overcurrent detection unit is used for detecting the electromagnetic noise characteristic and the reference waveform of low-voltage overcurrent; the tripper driving unit is used for cutting off the power supply of the load carried by the tripper driving unit when the condition is met. The inductive load low-voltage protection circuit is convenient to use, wide in application range and higher in reliability.
Description
Technical field
The present invention relates to inductive load under-voltage protection field, more particularly to a kind of inductive load low voltage protection circuit,
And the inductive load method of undervoltage protection based on the protection circuit.
Background technology
Loop transfer impedance can cause low-voltage to cause inductive load compressor of air conditioner to cause severe accident.In view of loop passes
Defeated impedance problems are mainly appeared in the load of the excitatory characteristic in loop connection terminal, joint, socket and loop, thus are gone out
The problem of existing, is all classified as problem of the load of connection terminal or joint or socket or excitatory characteristic itself.
When loop transfer impedance increases to the minimal tour impedance of excitation loads demand, excitation loads enter overlond running
State, it is very big to excitation loads aging effects.The reliability of air conditioner can cross high partial pressures because of loop transfer impedance makes excitatory bear
Carry and low-voltage overload failure occurs, reduce reliability.In addition, low-voltage causes the overcurrent of inductive load terminal can be caused to connect
Touch bad, plug and socket loose contact and then fire occurs.
The two kinds of protected modes of overcurrent and power end Voltage Drop of under-voltage protection generally use detecting at present.Major defect
It is：1st, the low-voltage variation of former detecting overcurrent is influenceed by current transformer magnetic saturation problem summation current transformer precision problem,
Original under-voltage protection is set shielding failure or the integrity problem of malfunction occur；2nd, the low electricity of former detecting power end Voltage Drop
Pressure protection is effective to the Voltage Drop of test point front end, and the loose contact to test point rear end causes the excessive electricity of impedance loop
It is helpless that pressure, which is fallen,.
The content of the invention
The inductive load low voltage protection circuit higher it is an object of the invention to propose a kind of reliability.
Another object of the present invention is the inductive load method of undervoltage protection for proposing that a kind of reliability is higher.
For up to this purpose, on the one hand, the present invention uses following technical scheme：
A kind of inductive load low voltage protection circuit, the protection circuit comprise at least dc source output unit, processing
Device unit, low-voltage over-current detection unit and electrical apparatus release driver element；The dc source output unit is respectively the place
Manage device unit and low-voltage over-current detection unit provides power supply；The processor unit is used for the running for controlling the protection circuit
Process；The low-voltage over-current detection unit is used for the electromagnetic noise characteristic and reference waveform for detecting low-voltage excessively stream；It is described de-
Button device driver element is used to cut off its load-carrying power supply of institute when condition meets；Wherein, the low-voltage over-current detection unit
It is described including at least the third terminal X003 of two output pins of the current transformer being provided with as low-voltage over-current detection
Third terminal X003 the first pin is respectively connecting to the first electric capacity of detection unit C31 first end and detection unit first resistor
R31 first end；The second pin of the third terminal X003 is connected to low level；The first electric capacity of detection unit C31's
Second end is connected to the first diode of detection unit D31 anode；The negative electrode of the first diode D31 is respectively connecting to detect
4th pipe of the second electric capacity of unit C32 first end, detection unit second resistance R32 first end and the processor unit
Pin P1.2；The second electric capacity of detection unit C32 the second end and detection unit second resistance R32 the second end are connected to low level；
Form the electromagnetic noise characteristic tester of low-voltage excessively stream；Detection unit first resistor R31 the second end is connected to the two or two
Pole pipe D32 anode, the negative electrode of the second diode D32 are respectively connecting to detection unit 3rd resistor R33 first end, inspection
Survey the electric capacity C33 of unit the 3rd first end and the first end of the resistance R34 of detection unit the 4th；The resistance R34 of detection unit the 4th
The second end be respectively connecting to voltage-regulator diode D33 negative electrode, the resistance R35 of detection unit the 5th first end and the place
Manage the 5th pin P1.3 of device unit；The second end of the detection unit 3rd resistor R33, the electric capacity of the detection unit the 3rd
Second end at C33 the second end, the anode of the voltage-regulator diode D33 and the resistance R35 of the detection unit the 5th is all connected with
To low level；Form the reference waveform detection circuit of low-voltage over-current detection.
Particularly, the dc source output unit including at least the first terminal X001, the first terminal X001 the
Two pins are respectively connecting to piezo-resistance R10 first end, power subsystem first resistor R11 first end, power supply by live wire
The first electric capacity of unit C11 first end and power subsystem second resistance R12 first end, the power subsystem second resistance
R12 the second end is connected to rectifier bridge BG1 first input end by live wire；The first pin of the first terminal X001 passes through
Zero line is respectively connecting to the second end of the piezo-resistance R10, the second end of the power subsystem first resistor R11, the electricity
The first electric capacity of source unit C11 the second end and the 3rd input of the rectifier bridge BG1；The second of the rectifier bridge BG1 is defeated
Enter end and be respectively connecting to electrochemical capacitor C10 positive pole, power subsystem 3rd resistor R13 first end, the resistance of power subsystem the 4th
R14 first end, the resistance R15 of power subsystem the 5th first end；The second end of the resistance R14 of power subsystem the 4th is connected to
Light emitting diode D11 anode, the second end of the resistance R15 of power subsystem the 5th are respectively connecting to high level and the pole of voltage stabilizing two
Pipe D12 negative electrode；The 4th input of the rectifier bridge BG1 is respectively connecting to the negative pole of the electrochemical capacitor C10, the power supply
Unit 3rd resistor R13 the second end, the negative electrode of the light emitting diode D11, the voltage-regulator diode D12 anode and
Low level.
Particularly, the processor unit is MSP430F2012.
Particularly, electrical apparatus release driver element comprises at least controllable silicon BT1；The control pole of the controllable silicon BT1 connects respectively
To driver element first resistor R41 first end and the first electric capacity of driver element C41 first end；The electricity of driver element first
Resistance R41 the second end is connected to the second pin P1.0 of the processor unit；The second of the first electric capacity of driver element C41
End is connected to the negative electrode of the controllable silicon BT1；The anode of the controllable silicon BT1 is connected to the first of electrical apparatus release breaking coil TKQ
End, the second end of the electrical apparatus release breaking coil TKQ is connected to electrical apparatus release stationary contact D9；When electrical apparatus release movable contact TK_L is closed
When, the electrical apparatus release stationary contact D9 is connected with the second pin of the first terminal X001.
On the other hand, the present invention uses following technical scheme：
A kind of inductive load method of undervoltage protection based on above-mentioned protection circuit, methods described are by high frequency sampling electricity
The high-frequency signal that rood arrives is suppressed in high current field region, with reduce or disappear high frequency carrier higher hamonic wave and then shape
Into low-voltage overcurrent protection.
Particularly, the guard method comprises the steps：
Step 1, initialization；
Step 2, judge whether 200us interrupt identifications are 1, be to go to step 3, otherwise go to step 7；
Step 3, calendar subroutine is performed, timing reaches setting time；
Step 4,200us interrupt response subprograms are performed, 200us interrupt identifications are reset；
Step 5, A/D conversion routines are performed, complete the sampling of electromagnetic noise characteristic electric arc and reference to low-voltage excessively stream
The A/D conversions of waveform electric arc sampling；
Step 6, perform low-voltage overcurrent protection subprogram, the 4th pin P1.2 of the processor unit and the 5th pin
P1.3 counting is reset；
Step 7, judge whether low-voltage overcurrent protection mark is 1, be to go to step 8, otherwise go to step 9；
Step 8, electrical apparatus release disconnect；
Step 9, go to step 2.
Further, in step 3, the calendar subroutine comprises the steps：
Step 3.1, judge whether 200 μ s interruption times are more than four times, be to go to step 3.2, otherwise go to step
3.6；
The timing of step 3.2, ms timers adds 1,200us interruption times to reset；
Step 3.3, judge whether all kinds of timing markers are 1, be to go to step 3.4, otherwise go to step 3.5；
Each self clock of step 3.4, timer；
Step 3.5, judge whether the timing of ms timers is more than 999, be to go to step 3.6, otherwise go to step
3.7；
Step 3.6, when, the equal timing of minute, second timer；
Step 3.7, return.
Particularly, in step 4,200us interrupt responses subprogram comprises the steps：
Step 4.1,200 μ s interruption times add 1；
Step 4.2,200 μ s interrupt identifications put 1；
Step 4.3, open interruption；
Step 4.4, return.
Particularly, in steps of 5, A/D conversion routines comprise the steps：
Step 5.1, selection sampling channel；
Step 5.2, start A/D conversions；
Step 5.3, A/D is waited to convert；
Step 5.4, return.
Particularly, it is characterised in that in step 6, low-voltage overcurrent protection subprogram comprises the steps：
Step 6.1,3 seconds counters are set；
Step 6.2, judge whether low-voltage overcurrent protection occur, be to go to step 6.12, otherwise go to step 6.3；
Step 6.3, judge whether 3ms counters are equal to 0, be to go to step 6.6, otherwise go to step 6.4；
First counts when step 6.4, the voltage at the 5th pin P1.3 detection mouths of the processor unit are more than 200mV
Number device CNT1 count values add 1, second when the voltage at the 4th pin P1.2 detection mouths of the processor unit is more than 200mV
The count value of counter cnt 2 adds 1；
Step 6.5, judge the count value of the second counter cnt 2 whether be less than 2 and the count value of the first counter cnt 1 whether
Equal to 1, it is to go to step 6.10, otherwise go to step 6.8；
First counts when step 6.6, the voltage at the 5th pin P1.3 detection mouths of the processor unit are more than 200mV
Number device CNT1 count values add 1；
Step 6.7, go to step 6.5；
Step 6.8, low-voltage excessively stream counter O reset；
Step 6.9, judge whether the count value of first counter cnt 1 is more than or equal to 4, be to go to step 6.12,
Otherwise step 6.13 is gone to；
Step 6.10, low-voltage excessively stream rolling counters forward add 1；
Step 6.11, go to step 6.9；
Step 6.12, electrical apparatus release are threaded off；
Step 6.13, the count value of the first counter cnt 1 are set to 0, and the count value of the second counter cnt 2 is set to 0；
Step 6.14, return.
Inductive load low voltage protection circuit of the present invention includes dc source output unit, processor unit, low-voltage mistake
Detection unit and electrical apparatus release driver element are flowed, the high-frequency signal by high frequency sampling circuit can be utilized in failure high current shape
High-frequency signal is suppressed in high current field region under state, the phenomenon that high frequency carrier higher hamonic wave is reduced or disappeared occurs, and is made
For low-voltage overcurrent protection.The protection circuit is easy to use, applied widely, and reliability is higher.
Brief description of the drawings
Fig. 1 is that the low-voltage over-current detection unit that the preferred embodiment of the present invention one provides opens up complement；
Fig. 2 is that the dc source output unit that the preferred embodiment of the present invention one provides opens up complement；
Fig. 3 is that the processor unit that the preferred embodiment of the present invention one provides opens up complement；
Fig. 4 is that the electrical apparatus release driver element that the preferred embodiment of the present invention one provides opens up complement；
Fig. 5 is the controllable silicon BT1 triggering and conducting views that the preferred embodiment of the present invention one provides；
Fig. 6 is the inductive load method of undervoltage protection flow chart that the preferred embodiment of the present invention one provides.
Embodiment
Further illustrate technical scheme below in conjunction with the accompanying drawings and by embodiment.
Preferred embodiment one：
This preferred embodiment discloses a kind of inductive load low voltage protection circuit.The protection circuit comprises at least dc source
Output unit, processor unit, low-voltage over-current detection unit and electrical apparatus release driver element.Wherein, dc source output is single
Member is respectively that processor unit and low-voltage over-current detection unit provide power supply；Processor unit is used for the fortune of control protection electric circuit
Make process；Low-voltage over-current detection unit is used for the electromagnetic noise characteristic and reference waveform for detecting low-voltage excessively stream；Electrical apparatus release drives
Moving cell is used to cut off its load-carrying power supply of institute when condition meets.
As shown in figure 1, low-voltage over-current detection unit is mutual as the electric current of low-voltage over-current detection including at least being provided with
The third terminal X003 of two output pins of sensor, third terminal X003 the first pin are respectively connecting to detection unit first
Electric capacity C31 first end and detection unit first resistor R31 first end；Third terminal X003 second pin is connected to low electricity
It is flat.
The first electric capacity of detection unit C31 the second end is connected to the first diode of detection unit D31 anode；One or two pole
Pipe D31 negative electrode is respectively connecting to the second electric capacity of detection unit C32 first end, detection unit second resistance R32 first end
And the 4th pin P1.2 of processor unit；The second electric capacity of detection unit C32 the second end and detection unit second resistance R32
The second end be connected to low level；Form the electromagnetic noise characteristic tester of low-voltage excessively stream.
Detection unit first resistor R31 the second end is connected to the second diode D32 anode, the second diode D32's
Negative electrode is respectively connecting to detection unit 3rd resistor R33 first end, the electric capacity C33 of detection unit the 3rd first end, Yi Jijian
Survey the first end of the resistance R34 of unit the 4th；Second end of the resistance R34 of detection unit the 4th is respectively connecting to voltage-regulator diode D33
Negative electrode, the resistance R35 of detection unit the 5th first end and the 5th pin P1.3 of processor unit；Detection unit the 3rd
Resistance R33 the second end, the electric capacity C33 of detection unit the 3rd the second end, voltage-regulator diode D33 anode and detection unit
5th resistance R35 the second end is connected to low level；Form the reference waveform detection circuit of low-voltage over-current detection.
Caused by being accessed in the output end of current transformer during high fdrequency component all the way detects circuit to protection circuit
High frequency noise components are sampled, and different changes can occur for the high frequency noise components in circuit before and after the generation of low-voltage excessively stream
Change, detection obtains information needed；In order to distinguish the true and false, (change is it could also be possible that ungenuine signal is adopted caused by low-voltage excessively stream
Sample), the detection of low-voltage over current fault is to carry out signal sampling values by two different branch, and after being compared, can just be made
Really judge.
As shown in Fig. 2 dc source output unit comprises at least the first terminal X001, the second of the first terminal X001
Pin is respectively connecting to piezo-resistance R10 first end, power subsystem first resistor R11 first end, power supply list by live wire
Member the first electric capacity C11 first end and power subsystem second resistance R12 first end, the of power subsystem second resistance R12
Two ends are connected to rectifier bridge BG1 first input end by live wire.
The first terminal X001 the first pin is respectively connecting to piezo-resistance R10 the second end, power subsystem by zero line
First resistor R11 the second end, the first electric capacity of power subsystem C11 the second end and rectifier bridge BG1 the 3rd input.
Rectifier bridge BG1 the second input is respectively connecting to electrochemical capacitor C10 positive pole, power subsystem 3rd resistor R13
First end, the resistance R14 of power subsystem the 4th first end, the resistance R15 of power subsystem the 5th first end；Power subsystem the 4th
Resistance R14 the second end is connected to light emitting diode D11 anode, and the resistance R15 of power subsystem the 5th the second end connects respectively
To high level and voltage-regulator diode D12 negative electrode.
Rectifier bridge BG1 the 4th input is respectively connecting to electrochemical capacitor C10 negative pole, power subsystem 3rd resistor R13
The second end, light emitting diode D11 negative electrode, voltage-regulator diode D12 anode and low level.
As shown in figure 3, the concrete model of processor unit is unlimited, preferably MSP430F2012.
As shown in figure 4, electrical apparatus release driver element comprises at least controllable silicon BT1；Controllable silicon BT1 control pole (g poles) is respectively
It is connected to driver element first resistor R41 first end and the first electric capacity of driver element C41 first end；The electricity of driver element first
Resistance R41 the second end is connected to the second pin P1.0 of processor unit；The first electric capacity of driver element C41 the second end is connected to
Controllable silicon BT1 negative electrode (k poles).
Controllable silicon BT1 anode (a poles) is connected to electrical apparatus release breaking coil TKQ first end, electrical apparatus release breaking coil TKQ
The second end be connected to electrical apparatus release stationary contact D9；When electrical apparatus release movable contact TK_L is closed, electrical apparatus release stationary contact D9 and described the
One terminal X001 second pin is connected.
As shown in figure 5, triggering command is sent, through driver element first resistor by the second pin P1.0 of processor unit
R41 provides trigger pip, controllable silicon BT1 triggering and conductings, the breaking coil of electrical apparatus release to controllable silicon BT1 control pole (g poles)
TKQ circuit loop is connected and has DC current to flow through breaking coil TKQ, the action of electrical apparatus release actuating mechanism, completes electrical apparatus release
Thread off and trip, the load-carrying power supply of cut-out electrical apparatus release institute.
Inductive load method of undervoltage protection based on above-mentioned protection circuit is the high frequency obtained by high frequency sampling circuit
Signal is suppressed in high current field region, with reduce or disappear high frequency carrier higher hamonic wave and then formation low-voltage excessively stream
Protection.
As shown in fig. 6, the guard method comprises the steps：
Step 1, initialization；
Step 2, judge whether 200us interrupt identifications are 1, be to go to step 3, otherwise go to step 7；
Step 3, calendar subroutine is performed, timing reaches setting time；
Step 4,200us interrupt response subprograms are performed, 200us interrupt identifications are reset；
Step 5, A/D conversion routines are performed, complete the sampling of electromagnetic noise characteristic electric arc and reference to low-voltage excessively stream
The A/D conversions of waveform electric arc sampling；
Step 6, perform low-voltage overcurrent protection subprogram, the 4th pin P1.2 of the processor unit and the 5th pin
P1.3 counting is reset；
Step 7, judge whether low-voltage overcurrent protection mark is 1, be to go to step 8, otherwise go to step 9；
Step 8, electrical apparatus release disconnect；
Step 9, go to step 2.
Wherein, in step 3, calendar subroutine comprises the steps：
Step 3.1, judge whether 200 μ s interruption times are more than four times, be to go to step 3.2, otherwise go to step
3.6；
The timing of step 3.2, ms timers adds 1,200us interruption times to reset；
Step 3.3, judge whether all kinds of timing markers are 1, be to go to step 3.4, otherwise go to step 3.5；
Each self clock of step 3.4, timer；
Step 3.5, judge whether the timing of ms timers is more than 999, be to go to step 3.6, otherwise go to step
3.7；
Step 3.6, when, the equal timing of minute, second timer；
Step 3.7, return.
In step 4,200us interrupt responses subprogram comprises the steps：
Step 4.1,200 μ s interruption times add 1；
Step 4.2,200 μ s interrupt identifications put 1；
Step 4.3, open interruption；
Step 4.4, return.
In steps of 5, A/D conversion routines comprise the steps：
Step 5.1, selection sampling channel；
Step 5.2, start A/D conversions；
Step 5.3, A/D is waited to convert；
Step 5.4, return.
In step 6, low-voltage overcurrent protection subprogram comprises the steps：
Step 6.1,3 seconds counters are set；
Step 6.2, judge whether low-voltage overcurrent protection occur, be to go to step 6.12, otherwise go to step 6.3；
Step 6.3, judge whether 3ms counters are equal to 0, be to go to step 6.6, otherwise go to step 6.4；
First counter when step 6.4, the voltage at the 5th pin P1.3 detection mouths of processor unit are more than 200mV
CNT1 count values add 1, the second counter when the voltage at the 4th pin P1.2 detection mouths of processor unit is more than 200mV
CNT2 count values add 1, and (if detecting pulse, counter only adds 1 time.)
Step 6.5, judge the count value of the second counter cnt 2 whether be less than 2 and the count value of the first counter cnt 1 whether
Equal to 1, it is to go to step 6.10, otherwise go to step 6.8；
First counter when step 6.6, the voltage at the 5th pin P1.3 detection mouths of processor unit are more than 200mV
CNT1 count values add 1, and (if detecting pulse, counter only adds 1 time.)
Step 6.7, go to step 6.5；
Step 6.8, low-voltage excessively stream counter O reset；
Step 6.9, judge whether the count value of the first counter cnt 1 is more than or equal to 4, be to go to step 6.12, otherwise
Go to step 6.13；
Step 6.10, low-voltage excessively stream rolling counters forward add 1；
Step 6.11, go to step 6.9；
Step 6.12, electrical apparatus release are threaded off；
Step 6.13, the count value of the first counter cnt 1 are set to 0, and the count value of the second counter cnt 2 is set to 0；
Step 6.14, return.
Preferred embodiment two：
This preferred embodiment discloses a kind of inductive load low voltage protection circuit, its structure and one basic phase of preferred embodiment
Together.The protection circuit comprises at least dc source output unit, processor unit, low-voltage over-current detection unit and threaded off
Device driver element.
Difference is：The concrete structure of inductive load low voltage protection circuit is unlimited, can pass through high frequency sampling circuit
Obtained high-frequency signal is suppressed in high current field region, with reduce or disappear high frequency carrier higher hamonic wave and then formation
Low-voltage overcurrent protection.
Pay attention to, the technical principle that above are only presently preferred embodiments of the present invention and used.Those skilled in the art can manage
Solution, the invention is not restricted to specific embodiment described here, can carry out various obvious changes for a person skilled in the art
Change, readjust and substitute without departing from protection scope of the present invention.Therefore, although being entered by above example to the present invention
Go and be described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept,
Other more equivalent embodiments can also be included, and the scope of the present invention is determined by scope of the appended claims.
Claims (10)
1. a kind of inductive load low voltage protection circuit, it is characterised in that the protection circuit exports including at least dc source
Unit, processor unit, low-voltage over-current detection unit and electrical apparatus release driver element；The dc source output unit point
Power supply is not provided for the processor unit and low-voltage over-current detection unit；The processor unit is used to control the protection
The operation of circuit；The low-voltage over-current detection unit is used for the electromagnetic noise characteristic and reference wave for detecting low-voltage excessively stream
Shape；The electrical apparatus release driver element is used to cut off its load-carrying power supply of institute when condition meets；
Wherein, the low-voltage over-current detection unit is including at least the current transformer being provided with as low-voltage over-current detection
The third terminal (X003) of two output pins, the first pin of the third terminal (X003) are respectively connecting to detection unit
One electric capacity C31 first end and detection unit first resistor R31 first end；The second pin of the third terminal (X003) connects
It is connected to low level；
The second end of the first electric capacity of detection unit C31 is connected to the first diode of detection unit D31 anode；Described first
Diode D31 negative electrode is respectively connecting to the second electric capacity of detection unit C32 first end, the of detection unit second resistance R32
One end and the 4th pin (P1.2) of the processor unit；The second electric capacity of detection unit C32 the second end and detection unit
Second resistance R32 the second end is connected to low level；Form the electromagnetic noise characteristic tester of low-voltage excessively stream；
Detection unit first resistor R31 the second end is connected to the second diode D32 anode, the second diode D32's
Negative electrode is respectively connecting to detection unit 3rd resistor R33 first end, the electric capacity C33 of detection unit the 3rd first end, Yi Jijian
Survey the first end of the resistance R34 of unit the 4th；Second end of the resistance R34 of detection unit the 4th is respectively connecting to voltage-regulator diode D33
Negative electrode, the resistance R35 of detection unit the 5th first end and the 5th pin (P1.3) of the processor unit；The inspection
Survey unit 3rd resistor R33 the second end, the electric capacity C33 of the detection unit the 3rd the second end, the voltage-regulator diode D33
Anode and the resistance R35 of the detection unit the 5th the second end are connected to low level；Form the ginseng of low-voltage over-current detection
Examine waveform detection circuit.
2. inductive load low voltage protection circuit according to claim 1, it is characterised in that the dc source output is single
Member comprises at least the first terminal (X001), and the second pin of the first terminal (X001) is respectively connecting to pressure-sensitive electricity by live wire
Hinder R10 first end, power subsystem first resistor R11 first end, the first electric capacity of power subsystem C11 first end, Yi Ji electricity
Source unit second resistance R12 first end, the second end of the power subsystem second resistance R12 are connected to rectifier bridge by live wire
(BG1) first input end；
First pin of the first terminal (X001) is respectively connecting to the second end, the institute of the piezo-resistance R10 by zero line
State power subsystem first resistor R11 the second end, the first electric capacity of power subsystem C11 the second end and the rectifier bridge
(BG1) the 3rd input；
Second input of the rectifier bridge (BG1) is respectively connecting to electrochemical capacitor C10 positive pole, power subsystem 3rd resistor
R13 first end, the resistance R14 of power subsystem the 4th first end, the resistance R15 of power subsystem the 5th first end；The power supply
The resistance R14 of unit the 4th the second end is connected to light emitting diode D11 anode, and the of the resistance R15 of the power subsystem the 5th
Two ends are respectively connecting to high level and voltage-regulator diode D12 negative electrode；
4th input of the rectifier bridge (BG1) is respectively connecting to the negative pole of the electrochemical capacitor C10, the power subsystem
Three resistance R13 the second end, the negative electrode of the light emitting diode D11, the anode and low level of the voltage-regulator diode D12.
3. inductive load low voltage protection circuit according to claim 1 or 2, it is characterised in that the processor unit
For MSP430F2012.
4. inductive load low voltage protection circuit according to claim 2, it is characterised in that the electrical apparatus release driver element
Including at least controllable silicon BT1；The control pole of the controllable silicon BT1 is respectively connecting to driver element first resistor R41 first end
With the first electric capacity of driver element C41 first end；The second end of the driver element first resistor R41 is connected to the processor
The second pin (P1.0) of unit；The second end of the first electric capacity of driver element C41 is connected to the moon of the controllable silicon BT1
Pole；
The anode of the controllable silicon BT1 is connected to electrical apparatus release breaking coil (TKQ) first end, the electrical apparatus release breaking coil
(TKQ) the second end is connected to electrical apparatus release stationary contact (D9)；When electrical apparatus release movable contact (TK_L) closes, the electrical apparatus release is quiet
Contact (D9) is connected with the second pin of the first terminal (X001).
A kind of 5. inductive load under-voltage protection based on any inductive load low voltage protection circuit of Claims 1-4
Method, it is characterised in that methods described be by the high-frequency signal that high frequency sampling circuit obtains in high current field region quilt
Suppress, with reduce or disappear high frequency carrier higher hamonic wave and then formation low-voltage overcurrent protection.
6. inductive load method of undervoltage protection according to claim 5, it is characterised in that under the guard method includes
State step：
Step 1, initialization；
Step 2, judge whether 200us interrupt identifications are 1, be to go to step 3, otherwise go to step 7；
Step 3, calendar subroutine is performed, timing reaches setting time；
Step 4,200us interrupt response subprograms are performed, 200us interrupt identifications are reset；
Step 5, A/D conversion routines are performed, completed to the electromagnetic noise characteristic electric arc sampling of low-voltage excessively stream and reference waveform
The A/D conversions of electric arc sampling；
Step 6, perform low-voltage overcurrent protection subprogram, the 4th pin (P1.2) of the processor unit and the 5th pin
(P1.3) counting is reset；
Step 7, judge whether low-voltage overcurrent protection mark is 1, be to go to step 8, otherwise go to step 9；
Step 8, electrical apparatus release disconnect；
Step 9, go to step 2.
7. inductive load method of undervoltage protection according to claim 6, it is characterised in that in step 3, the timing
Subprogram comprises the steps：
Step 3.1, judge whether 200 μ s interruption times are more than four times, be to go to step 3.2, otherwise go to step 3.6；
The timing of step 3.2, ms timers adds 1,200us interruption times to reset；
Step 3.3, judge whether all kinds of timing markers are 1, be to go to step 3.4, otherwise go to step 3.5；
Each self clock of step 3.4, timer；
Step 3.5, judge whether the timing of ms timers is more than 999, be to go to step 3.6, otherwise go to step 3.7；
Step 3.6, when, the equal timing of minute, second timer；
Step 3.7, return.
8. inductive load method of undervoltage protection according to claim 6, it is characterised in that in step 4, in 200us
Disconnected response subprogram comprises the steps：
Step 4.1,200 μ s interruption times add 1；
Step 4.2,200 μ s interrupt identifications put 1；
Step 4.3, open interruption；
Step 4.4, return.
9. inductive load method of undervoltage protection according to claim 6, it is characterised in that in steps of 5, A/D conversions
Subprogram comprises the steps：
Step 5.1, selection sampling channel；
Step 5.2, start A/D conversions；
Step 5.3, A/D is waited to convert；
Step 5.4, return.
10. according to any described inductive load method of undervoltage protection of claim 6 to 9, it is characterised in that in step 6,
Low-voltage overcurrent protection subprogram comprises the steps：
Step 6.1,3 seconds counters are set；
Step 6.2, judge whether low-voltage overcurrent protection occur, be to go to step 6.12, otherwise go to step 6.3；
Step 6.3, judge whether 3ms counters are equal to 0, be to go to step 6.6, otherwise go to step 6.4；
First counts when step 6.4, the voltage at the 5th pin (P1.3) detection mouth of the processor unit are more than 200mV
Device (CNT1) count value adds 1, when the voltage at the 4th pin (P1.2) detection mouth of the processor unit is more than 200mV
Two counters (CNT2) count value adds 1；
Step 6.5, judge the second counter (CNT2) count value whether be less than 2 and first counter (CNT1) count value whether
Equal to 1, it is to go to step 6.10, otherwise go to step 6.8；
First counts when step 6.6, the voltage at the 5th pin (P1.3) detection mouth of the processor unit are more than 200mV
Device (CNT1) count value adds 1；
Step 6.7, go to step 6.5；
Step 6.8, low-voltage excessively stream counter O reset；
Step 6.9, judge whether the count value of first counter (CNT1) is more than or equal to 4, be to go to step 6.12, it is no
Then go to step 6.13；
Step 6.10, low-voltage excessively stream rolling counters forward add 1；
Step 6.11, go to step 6.9；
Step 6.12, electrical apparatus release are threaded off；
Step 6.13, the first counter (CNT1) count value are set to 0, and the second counter (CNT2) count value is set to 0；
Step 6.14, return.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510482055.5A CN105162080B (en) | 2015-08-07 | 2015-08-07 | Inductive load low-voltage protection circuit and protection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510482055.5A CN105162080B (en) | 2015-08-07 | 2015-08-07 | Inductive load low-voltage protection circuit and protection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105162080A CN105162080A (en) | 2015-12-16 |
| CN105162080B true CN105162080B (en) | 2018-01-19 |
Family
ID=54802877
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510482055.5A Expired - Fee Related CN105162080B (en) | 2015-08-07 | 2015-08-07 | Inductive load low-voltage protection circuit and protection method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105162080B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109185919B (en) * | 2018-08-30 | 2024-06-04 | 珠海格力电器股份有限公司 | Pulse ignition control circuit, pulse igniter and household appliance |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030038640A1 (en) * | 2001-08-24 | 2003-02-27 | Zuercher Joseph C. | Apparatus for detecting arcing and overcurrents in dc electrical systems subject to cyclic disturbances |
| CN1917320A (en) * | 2005-08-19 | 2007-02-21 | 珠海格力电器股份有限公司 | Fault arc protection circuit and fault arc detection method |
| CN101174768A (en) * | 2006-11-03 | 2008-05-07 | 苏州三星电子有限公司 | Method and system for instantaneous power-off protection of air conditioner |
| CN102830263A (en) * | 2012-08-31 | 2012-12-19 | 惠州三华工业有限公司 | Over-current detection system of inverter circuit and method of over-current detection system |
| CN104466905A (en) * | 2014-12-23 | 2015-03-25 | 珠海格力电器股份有限公司 | Fault arc protection device and method thereof |
| CN204947569U (en) * | 2015-08-07 | 2016-01-06 | 珠海格力电器股份有限公司 | Inductive load low voltage protection circuit |
-
2015
- 2015-08-07 CN CN201510482055.5A patent/CN105162080B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030038640A1 (en) * | 2001-08-24 | 2003-02-27 | Zuercher Joseph C. | Apparatus for detecting arcing and overcurrents in dc electrical systems subject to cyclic disturbances |
| CN1917320A (en) * | 2005-08-19 | 2007-02-21 | 珠海格力电器股份有限公司 | Fault arc protection circuit and fault arc detection method |
| CN101174768A (en) * | 2006-11-03 | 2008-05-07 | 苏州三星电子有限公司 | Method and system for instantaneous power-off protection of air conditioner |
| CN102830263A (en) * | 2012-08-31 | 2012-12-19 | 惠州三华工业有限公司 | Over-current detection system of inverter circuit and method of over-current detection system |
| CN104466905A (en) * | 2014-12-23 | 2015-03-25 | 珠海格力电器股份有限公司 | Fault arc protection device and method thereof |
| CN204947569U (en) * | 2015-08-07 | 2016-01-06 | 珠海格力电器股份有限公司 | Inductive load low voltage protection circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105162080A (en) | 2015-12-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101227076B (en) | Fault self-checking circuit of earthing fault breaker | |
| CN102315621B (en) | Electric wire connection protecting device with self-checking function | |
| CN101900771B (en) | RCD (Residual Current Device) detection device and detection method | |
| US8154832B2 (en) | Leak detection and leak protection circuit | |
| CN203054158U (en) | Arc fault detecting device with working state indicating function | |
| US20070159738A1 (en) | Receptacle providing sustained excessive voltage protection | |
| US20170338643A1 (en) | Circuit protection device with self fault detection function | |
| CA2641836C (en) | Circuit interrupter and method of processor phase synchronization | |
| KR101851700B1 (en) | Current transformer Secondary commercial circuit and isolation Separate surveillance Protection method Distributing board | |
| CN104218523A (en) | Detecting circuit for circuit breaker | |
| CN112531642B (en) | Residual current protection circuit and residual current protection device | |
| CN200947538Y (en) | Leakage protection switch of short circuit detection before switch on | |
| CN201194327Y (en) | Leakage detecting protection circuit | |
| CN105162080B (en) | Inductive load low-voltage protection circuit and protection method | |
| CN201422006Y (en) | Electric leakage inspecting protection circuit | |
| CN203747373U (en) | Electric leakage protection-used control integrated module and electric leakage protection circuit with same | |
| CN206685314U (en) | A kind of relay with load faulty detection function | |
| CN204947569U (en) | Inductive load low voltage protection circuit | |
| CN104901090B (en) | A kind of conversion voltage-type leakage protecting plug | |
| CN106298382B (en) | Breaker realizes the switching method of arc fault warning and arc fault power-off | |
| CN216904283U (en) | GFCI capable of alarming after neutral line grounding fault detection function failure | |
| CN103376389A (en) | Fault electric arc judgment system for low-voltage line and judgment method thereof | |
| CN203965593U (en) | Air switch test device | |
| CN210111583U (en) | Leakage protector with low current trial run function | |
| CN102315620A (en) | Electronic tripper and direct-current circuit breaker provided with same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180119 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |