CN107727992A - A kind of load circuit and its wire break detection method - Google Patents
A kind of load circuit and its wire break detection method Download PDFInfo
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- CN107727992A CN107727992A CN201711080004.5A CN201711080004A CN107727992A CN 107727992 A CN107727992 A CN 107727992A CN 201711080004 A CN201711080004 A CN 201711080004A CN 107727992 A CN107727992 A CN 107727992A
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- 238000001514 detection method Methods 0.000 title claims abstract description 11
- 238000012544 monitoring process Methods 0.000 claims abstract description 26
- 238000001914 filtration Methods 0.000 claims description 11
- 239000003990 capacitor Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 230000005622 photoelectricity Effects 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 230000002159 abnormal effect Effects 0.000 abstract description 18
- 230000005856 abnormality Effects 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 3
- 230000005611 electricity Effects 0.000 description 12
- 238000010438 heat treatment Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000007789 sealing Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 229920006280 packaging film Polymers 0.000 description 1
- 239000012785 packaging film Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a kind of load circuit and its wire break detection method, it is related to field of circuit technology.The load circuit of the present invention includes controller, gate-controlled switch, load, monitoring modular, switch module and alarm module；Controller electrically connects with gate-controlled switch, and gate-controlled switch electrically connects with load；Monitoring modular is electrically connected with the output end of gate-controlled switch, and when it is zero to detect the output end current of gate-controlled switch, the first high level signal is exported to switch module；Switch module electrically connects with controller, monitoring modular and alarm module respectively, is turned on when receiving the second high level signal that the first high level signal and controller export at the same time；Alarm module produces broken string alarm signal and outwards exported when switch module turns on.The load circuit of the present invention can remind user to note abnormalities, so as to ensure that product quality and Electrical Safety in time when abnormal broken line occurs for load.
Description
Technical field
The present invention relates to field of circuit technology, more particularly to the wire break detection method of a kind of load circuit and load circuit.
Background technology
In existing circuit, the performance loop of load is to be loaded by the break-make of controller control gate-controlled switch with indirect control
Work, but the performance loop broken string easily loaded or load are broken down, user can not have found such event in time,
Cause to cause production accident, Electrical Safety hidden danger be present.
In some application scenarios, the sealing of China's packaging for foodstuff is generally sealed using heat pressing type, passes through temperature controller (control
Device) drive gate-controlled switch to control electrothermal tube (load) to be heated so that and the sealing part of packaging bag or packaging film is soft by heating,
Mechanical pressure is imposed again to be sealed.Because electrothermal tube is mounted on the reciprocating sealing briquetting of equipment, in actual production
During be easy to occur the electric heating route of pipe line and release or the failure burnt of electrothermal tube overheat, it is impossible to find in time, cause product
Sealing is not complete, influences product quality, great potential safety hazard be present.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of load circuit and load circuit of detectable circuit breaking
Wire break detection method.
In order to solve the above problems, in a first aspect, the present invention provides a kind of load circuit, including controller, gate-controlled switch
And load, controller electrically connect with the input of gate-controlled switch, the output end of gate-controlled switch electrically connects with load；Load electricity
Road also includes：Monitoring modular, electrically connected with the output end of gate-controlled switch；Switch module, respectively with controller, monitoring modular and
Alarm module electrically connects, and controls the working condition of alarm module；Alarm module, electrically connected with switch module.
Specifically, controller is temperature controller or temperature control module, and gate-controlled switch is solid-state relay.
Its further technical scheme is：Monitoring modular includes current transformer and operational amplifier；Wherein, current transformer
Primary side electrically connected with the output end of gate-controlled switch, the secondary side of current transformer and the input of operational amplifier are electrically connected
Connect；The output end of operational amplifier electrically connects with switch module, the in-phase input end ground connection of operational amplifier.
Its further technical scheme is：Switch module includes first resistor, the 4th resistance, the first photoelectrical coupler and second
Photoelectrical coupler；Wherein, the anode input of the first photoelectrical coupler passes through first resistor and the output end of operational amplifier electricity
Connection, the negative electrode input of the first photoelectrical coupler electrically connect with the in-phase input end of operational amplifier, the first photoelectrical coupler
Photosensitive tube connected with the photosensitive tube of the second photoelectrical coupler, the emitter stage of the first photoelectrical coupler electrically connects with alarm module；
The input of second photoelectrical coupler is electrically connected with the controller, photosensitive pipe collector and the alarm module electricity of the second photoelectrical coupler
Connection.
Specifically, first resistor is fixed value resistance or light emitting diode.
Specifically, the 4th resistance is fixed value resistance.
Its further technical scheme is：The load circuit also includes variable resistor, one end of variable resistor and the first photoelectricity
The negative electrode input electrical connection of coupler, the other end electrically connect with the in-phase input end of operational amplifier.
Its further technical scheme is：The load circuit also includes rectification filtering module, and rectification filtering module includes filtering
Electric capacity and second resistance, filter capacitor and second resistance are attempted by the output end of operational amplifier and the same phase of operational amplifier
Between input.
Its further technical scheme is：Rectification filtering module also includes diode, the positive pole and operational amplifier of diode
Output end electrical connection, the negative pole of diode electrically connected by first resistor with the anode input of the first photoelectrical coupler；Filter
Ripple electric capacity and second resistance are attempted by between the negative pole of diode and the in-phase input end of operational amplifier.
Its further technical scheme is：Alarm module includes active alarm circuit, active alarm circuit and switch module electricity
Connection.
Specifically, active alarm circuit is PLC (Programmable Logic Controller Programmable logical controllers
Device) input circuit, LED circuit and relay circuit any one.
Specifically, alarm module also includes the first output interface and the second output interface, the first output interface and the second light
The photosensitive pipe collector electrical connection of electric coupler, the second output interface electrically connect with the emitter stage of the first photoelectrical coupler；First
Output interface and the second output interface also electrically connect with active alarm circuit.
Second aspect, the present invention provide a kind of wire break detection method of load circuit, the load electricity applied to first aspect
Lu Zhong, this method include：
Monitoring modular exports the first high level letter when it is zero to detect the output current of gate-controlled switch, to switch module
Number；
When switch module receives the second high level signal that the first high level signal and controller export at the same time, open
Pass module is conducting state；
Alarm module is powered when switch module is conducting state, produces broken string alarm signal and outwards exports.
Compared with prior art, load circuit provided by the invention possesses burn out detection warning function, can monitor in real time
Monitoring signals are delivered to switch module and handled by output to the electric current loaded, when the event of abnormal broken line occurs for load
When, so as to alarm module outputting alarm signal, judged result is accurate, and user can be reminded to find life in time for switch module conducting
Production is abnormal, so as to ensure that product quality and Electrical Safety.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, it is required in being described below to embodiment to use
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are some embodiments of the present invention, general for this area
For logical technical staff, on the premise of not paying creative work, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of frame principle figure of load circuit provided in an embodiment of the present invention；
Fig. 2 is a kind of circuit diagram for load circuit that the specific embodiment of the invention provides；
Fig. 3 is the schematic flow diagram of a kind of load circuit and its wire break detection method provided in an embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in embodiment is clearly and completely retouched
State, similar reference numerals represent similar component in accompanying drawing.Obviously, embodiment explained below is only the present invention one
Divide embodiment, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not making
The every other embodiment obtained under the premise of creative work, belongs to the scope of protection of the invention.
It should be appreciated that ought be in this specification and in the appended claims in use, term " comprising " and "comprising" instruction
Described feature, entirety, step, operation, the presence of element and/or component, but it is not precluded from one or more of the other feature, whole
Body, step, operation, element, component and/or its presence or addition for gathering.
It is also understood that in this embodiment of the present invention term used in the description merely for the sake of description particular implementation
Example purpose and be not intended to limit the embodiment of the present invention.Such as the institute in specification and appended book of the embodiment of the present invention
As use, unless context clearly indicates other situations, otherwise " one " of singulative, "one" and "the" are intended to wrap
Include plural form.
The load circuit of the present invention is the phase for increasing the alarm of load circuit burn out detection newly on the basis of existing load circuit
Module is closed, produces alarm signal when making to be supported on abnormal broken line in time, reminds user to find circuit abnormal problem in time, it is applicable
In all load circuits, the load that is particularly suitable for use in is in the circuit of electrothermal tube.
Referring to Fig. 1, for the schematic block diagram of load circuit of the present invention, as seen from the figure, it includes controller 11, gate-controlled switch
12, load 13, monitoring modular 21, switch module 23, alarm module 24.Each part is described below：
Controller 11 electrically connects with gate-controlled switch 12, and controller 11 controls the working condition of gate-controlled switch 12.Specifically,
When controller 11 is to the output high level signal of gate-controlled switch 12, gate-controlled switch 12 turns on；Controller 11 exports to gate-controlled switch 12
During low level signal, gate-controlled switch 12 disconnects.Gate-controlled switch 12 electrically connects with load 13, and when gate-controlled switch 12 turns on, bears
13 are carried to be powered and start working；When gate-controlled switch 12 disconnects, load 13 is powered off and is stopped.In some application scenarios, hold
The current supply circuit broken string or load 13 that load 13 easily occurs break down, but user is difficult to find such event, pole in time
Production accident is easily caused, great potential safety hazard be present.
Therefore, in embodiments of the present invention, monitoring modular 21, monitoring modular 21 and gate-controlled switch are set in load circuit
12 electrical connections, when the electric current for monitoring the output end of gate-controlled switch 12 is zero, the first high level signal is exported to switch module 23,
Otherwise, low level signal is exported.Electric current is zero to specifically include following two situations：
First, the situation of normal power down, controller 11 exports low level signal to gate-controlled switch 12, and gate-controlled switch 12 disconnects
And the electric current of output end is set to be zero；
Second, the situation of abnormal power-down, when current supply circuit broken string or load 13 are broken down, although gate-controlled switch 12 is still
It is in the conduction state, but due to 13 internal faults of line broken circuit or load, the electric current for now flowing through gate-controlled switch 12 is zero.
Switch module 23, electrically connected respectively with monitoring modular 21, alarm module 24 and controller 11, receive monitoring modular 21
The signal exported with controller 11, control the working condition of alarm module 24.Monitoring modular 21 is only received at the same time to export
The first high level signal and controller 11 export the second high level signal when, switch module 23 turns on so that alarm module
24 are powered and work；Otherwise switch module 23 is disconnected so that alarm module 24 is powered off without working.Working method is specific as follows：
When switch module 23 receives the first high level signal, the electric current for showing the output end of gate-controlled switch 12 is zero, bag
Include the situation of normal power down or abnormal power-down；If receiving the low level signal of the output of controller 11 simultaneously, show controller
11 to gate-controlled switch 12 export low level signal be normal power down situation, switch module 23 is off-state；
When switch module 23 receives the low level signal of the output of monitoring modular 22, show the electricity of gate-controlled switch output end
Stream is not zero, and loads normal work, switch module 23 is off-state；
When switch module 23 receives the first high level signal, the electric current for showing the output end of gate-controlled switch 12 is zero, bag
Include the situation of normal power down or abnormal power-down；When switch module 23 receives the second high level signal of the output of controller 11
When, show that controller 11 exports high level signal to gate-controlled switch 12, gate-controlled switch 12 turns on, and load 13 is powered and starts work
Make；Therefore when switch module 23 receives the second high level signal of the first high level signal and the output of controller 11 simultaneously i.e.
For the situation of abnormal power-down, switch module 23 is conducting state.
Alarm module 24, electrically connected with switch module 23, when switch module 23 is conducting state, alarm module 24 is logical
Electricity, produce broken string alarm signal and simultaneously outwards export, the situation for the broken string that enables a user to early to note abnormalities.
By the technical scheme of application the present embodiment, break down and occur abnormal in current supply circuit broken string or load 13
During broken string, user can be reminded in time, so as to ensure that product quality and Electrical Safety.
Reference picture 2, in some embodiments, such as in the present embodiment, monitoring modular 21 includes Current Transmit and computing
Amplifier U1；The primary side of Current Transmit electrically connects with gate-controlled switch 12, the secondary side of Current Transmit and and computing
Amplifier U1 input electrical connection, operational amplifier U1 output end electrically connect with switch module 23, operational amplifier U1's
In-phase input end is grounded.The monitoring result of monitoring modular 21 specifically includes following two situations：
First, when the electric current for flowing through the output end of gate-controlled switch 12 is not zero, Current Transmit primary side has operating current
By Current Transmit secondary side produces the first output, anti-phase to transport to operational amplifier U1, and operational amplifier U1 exports low electricity
Ordinary mail number；
Second, when the electric current for flowing through the output end of gate-controlled switch 12 is zero, Current Transmit primary side no current passes through, electricity
Current transformer CT secondary sides produce the second output, anti-phase to transport to operational amplifier U1, and operational amplifier U1 exports the first high level
Signal.
It should be noted that when the first output refers to that Current Transmit primary side has the operating current to pass through, it is mutual by electric current
The output of sensor CT secondary sides sensing；When second output refers to that Current Transmit primary side no current passes through, by Current Mutual Inductance
The output of device CT secondary sides sensing.
Further, switch module 23 includes first resistor R1, the 4th resistance R4, the first photoelectrical coupler U2 and the second light
Electric coupler U3；The output end electricity that first photoelectrical coupler U2 anode input passes through first resistor R1 and operational amplifier U1
Connection, the first photoelectrical coupler U2 negative electrode input electrically connect with operational amplifier U1 in-phase input end, the first photoelectricity coupling
Clutch U2 photosensitive tube is connected with the photosensitive tube of the second photoelectrical coupler U3, the first photoelectrical coupler U2 emitter stage and police
Show that module 24 electrically connects；Second photoelectrical coupler U3 input is electrically connected by the 4th resistance R4 with controller 11, the second light
Electric coupler U3 photosensitive pipe collector electrically connects with alarm module 24.
It should be noted that the first photoelectrical coupler U2 and the second photoelectrical coupler U3 series connection, forms the logic electricity " with door "
Road；When only the first photoelectrical coupler U2 and the second photoelectrical coupler U3 input are high level signal, switch module 23
Conducting state is only, otherwise switch module 23 is off-state.
First resistor R1 is serially connected in the first photoelectrical coupler U2 input, can prevent what the first photoelectrical coupler U2 from receiving
First high level signal voltage is excessive and breakdown；Similarly, the second photoelectrical coupler U3 input also concatenates the 4th resistance R4.
Further, switch module 23 also includes variable resistor R3, variable resistor R3 one end and the first photoelectrical coupler U2
The electrical connection of negative electrode input, the other end electrically connects with operational amplifier U1 in-phase input end.
It should be noted that when the electric current for flowing through the output end of gate-controlled switch 12 is not zero, operational amplifier U1 is to first
Photoelectrical coupler U2 exports low level signal, if the voltage of this low level signal is sufficiently large, it will so that the first photoelectrical coupler
U2 is turned on.Therefore, before normal use, it is necessary to be a desired value by variable resistor R3 resistance debugging, to cause the first light
Electric coupler U2 is not turned on when receiving the low level signal of operational amplifier U1 outputs, while is receiving operational amplifier
Turned on during the high level signal of U1 outputs.
Further, alarm module 24 is active alarm circuit, and it includes the first output interface LG1 and the second output interface
LG2；First output interface LG1 electrically connects with the second photoelectrical coupler U3 photosensitive pipe collector, the second output interface LG2 and
One photoelectrical coupler U2 photosensitive tube emitter stage electrical connection；First output interface LG1 and the second output interface LG2 also with active report
Alert loop electrical connection.
Specifically, when switch module 23 is conducting state, the outputs of the first output interface LG1 and second connect alarm module 24
Mouth LG2 is powered, and active alarm circuit is powered and produces broken string alarm signal and outwards export.
Specifically, active alarm circuit is any one of PLC input circuits, LED circuit and relay circuit
Kind.
In specific implementation, active alarm circuit is PLC input circuits, when the first output interface LG1 and the second output interface
When LG2 is powered, PLC input circuits are powered, and send warning sound or alarm signal automatically to remind user found the abnormal situation, together
When control device be stopped and prevent substandard product in time.
In specific implementation, active alarm circuit is LED circuit, when the outputs of the first output interface LG1 and second connect
When mouth LG2 is powered, LED circuit is powered, and sends alarm signal automatically to remind user found the abnormal situation.
In specific implementation, active alarm circuit is relay circuit, when the first output interface LG1 and the second output interface
When LG2 is powered, relay circuit conducting, control device is stopped, and prevents substandard product in time.
Further, load circuit of the invention also includes rectification filtering module 22, and it includes filter capacitor C1 and second
Resistance R2；Filter capacitor C1 and second resistance R2 is attempted by operational amplifier U1 output end and operational amplifier U1 same phase
Between input, the signal for exporting operational amplifier U1 is more stable, reduces interference of the alternation pulse ripple to circuit.
Further, rectification filtering module 22 also includes diode D1, and diode D1 positive pole is with operational amplifier U1's
Output end is electrically connected, and diode D1 negative pole is electrically connected by first resistor R1 and the first photoelectrical coupler U2 anode input
Connect；Filter capacitor C1 and second resistance R2 be attempted by diode D1 negative pole and operational amplifier U1 in-phase input end it
Between.
Referring to Fig. 3, the embodiment of the present invention provides the wire break detection method of load circuit, and this method is applied to previous embodiment
Load circuit in, from the figure 3, it may be seen that this method comprises the following steps S301-S303.
S301, monitoring modular are high to switch module output first when it is zero to detect the electric current of gate-controlled switch output end
Level signal.
In specific implementation, electric current is zero to specifically include following two situations：
First, the situation of normal power down, controller exports low level signal to gate-controlled switch, and gate-controlled switch disconnects and made defeated
The electric current for going out end is zero；
Second, the situation of abnormal power-down, when current supply circuit broken string or load are broken down, although gate-controlled switch still in
Conducting state, but due to line broken circuit or load internal fault, the electric current for now flowing through gate-controlled switch is zero.
S302, switch module receive at the same time monitoring modular output the first high level signal and controller output
During the second high level signal, switch module is conducting state.
In specific implementation, when switch module receives the first high level signal, show the electric current of gate-controlled switch output end
It is zero, including the situation of normal power down or abnormal power-down.
If while switch module receives the first high level signal, switch module receives the second of controller output
During high level signal, show that controller exports high level signal to gate-controlled switch, the state that gate-controlled switch is on, thus may be used
To conclude now for the situation of abnormal power-down, so as to which switch module is conducting state and controls alarm module to turn on.
S303, alarm module turn on when switch module is conducting state, produce broken string alarm signal and outwards export.
In specific implementation, alarm module turns on when switch module is conducting state, and generation broken string alarm signal is simultaneously outside
Output, enable a user to early find that load abnormal breaks.
By the technical scheme of application the present embodiment, break down and occur abnormal disconnected in current supply circuit broken string or load
During line, in time user can be reminded to note abnormalities, so as to ensure that product quality and Electrical Safety.
Concrete application scene explanation：
Fig. 2 is continued referring to, in some embodiments, such as in the present embodiment, load 13 is heater R5, and controller 11 is
Temperature controller TC, gate-controlled switch 12 are solid-state relay SSR, and alarm module 24 is external PLC input circuits.
Situation 1, in equipment runs Manufacturing Automated process, when temperature controller TC design temperature is more than actual temperature, from
Temperature controller TC exports the second high level signal to solid-state relay SSR input, makes solid-state relay SSR input positive
Conducting, connects heating circuit power supply, and heater R5 carries out heat temperature raising.The DC voltage of temperature controller TC outputs simultaneously is also through resistance
R4 to the second photoelectrical coupler U3 input, and cause the second photoelectrical coupler U3 conductings.
In normal heating process, heating circuit has primary side of the rated operational current by Current Transmit when turning on,
Current Transmit secondary side produces the first output to operational amplifier U1 input and makees anti-phase input, now from operation amplifier
Device U1 output end exports low level to the first photoelectrical coupler U2 input, and the first photoelectrical coupler U2 is not led
It is logical.Because the first photoelectrical coupler U2 and the second photoelectrical coupler U3 connects, so at output interface LG1 and output interface LG2
In off-position, it is impossible to PLC input circuit is powered, broken string alarm signal will not be produced.
Situation 2, when actual temperature is more than or equal to temperature controller CT design temperature, temperature controller CT output low levels, Gu
The electric current of state relay SSR outputs is zero, and control heater R5 is normally stopped.Because Current Transmit primary side is without electricity
Stream passes through, and Current Transmit secondary side produces the second output, anti-phase to transport to operational amplifier U1, from the defeated of operational amplifier U1
Go out the first high level signal of end output, by rectifying and wave-filtering so that signal stabilization so that the first photoelectrical coupler U2 is turned on；So
And the low level of temperature controller CT outputs causes the second photoelectrical coupler U3 to be not turned on.Due to the first photoelectrical coupler U2 and second
Photoelectrical coupler U3 connects, so output interface LG1 and output interface LG2 is in off-position, it is impossible to make PLC input circuit
It is powered, broken string alarm signal will not be produced.
Situation 3, heater R5 current supply circuit broken string, heater R5 failures or heater R5 power switches are jumped
Lock, when abnormal broken line occurs, Current Transmit primary side no current is by the way that it is defeated that Current Transmit secondary side produces second
Go out, it is anti-phase to transport to operational amplifier U1, the first high level signal is exported from operational amplifier U1 output end, by rectifying and wave-filtering
So that signal stabilization so that the first photoelectrical coupler U2 is turned on；Due to having made the second photoelectrical coupler U3 in normal heating process
Conducting, so output interface LG1 and output interface LG2 is in "on" position so that PLC input circuit, which is powered, produces broken string report
Alert signal, control device automatic alarm are shut down.
By application the present invention load circuit, detect load circuit broken string or load break down when, in time
Alarm response, remind user to note abnormalities the situation of broken string, avoid substandard product from producing, improve Electrical Safety.
In certain embodiments, temperature controller TC model is preferably AI-518D2G, certainly, in other embodiments, the temperature
Control device TC model can also select other types, and the present invention is not limited this.
In certain embodiments, the model of Current Transmit is preferably ZTA502, certainly, in other embodiments, should
The model of Current Transmit can also select other types, and the present invention is not limited this.
In certain embodiments, operational amplifier U1 model is preferably 0P07CP, and certainly, operational amplifier U1 may be used also
To select other types, the present invention is not limited this.
In certain embodiments, the first photoelectrical coupler U2 and the second photoelectrical coupler U3 model are both preferably
TLP521-1, certainly, the first photoelectrical coupler U2 and the second photoelectrical coupler U3 model can also select other types, this
Invention is not limited this.
In the above-described embodiments, the description to each embodiment all emphasizes particularly on different fields, and is not described in some embodiment
Part, may refer to the associated description of other embodiment.
It is described above, it is the embodiment of the present invention, but protection scope of the present invention is not limited thereto, and it is any ripe
Know those skilled in the art the invention discloses technical scope in, various equivalent modifications can be readily occurred in or replaced
Change, these modifications or substitutions should be all included within the scope of the present invention.Therefore, protection scope of the present invention should be with right
It is required that protection domain be defined.
Claims (8)
1. a kind of load circuit, including controller, gate-controlled switch and load, the controller are electrically connected with the gate-controlled switch
Connect, the gate-controlled switch electrically connects with the load, it is characterised in that also including monitoring modular, switch module and warning mould
Block；The monitoring modular electrically connects with the gate-controlled switch；The switch module respectively with the controller, the monitoring modular
And the alarm module electrical connection.
2. load circuit as claimed in claim 1, it is characterised in that the monitoring modular includes current transformer and computing is put
Big device；
The primary side of the current transformer electrically connects with the gate-controlled switch, the secondary side of the current transformer and the fortune
Calculate the input electrical connection of amplifier；
The output end of the operational amplifier electrically connects with the switch module, the homophase input termination of the operational amplifier
Ground.
3. load circuit as claimed in claim 2, it is characterised in that the switch module include first resistor, the 4th resistance,
First photoelectrical coupler and the second photoelectrical coupler；
The anode input of first photoelectrical coupler is electrically connected by first resistor with the output end of the operational amplifier,
The negative electrode input of first photoelectrical coupler electrically connects with the in-phase input end of the operational amplifier, first photoelectricity
The photosensitive tube of coupler is connected with the photosensitive tube of second photoelectrical coupler, the emitter stage of first photoelectrical coupler and institute
State alarm module electrical connection；
The input of second photoelectrical coupler is electrically connected by the 4th resistance with the controller, second photoelectric coupling
The photosensitive pipe collector of device electrically connects with the alarm module.
4. load circuit as claimed in claim 3, it is characterised in that also including variable resistor, one end of the variable resistor
Electrically connected with the negative electrode input of first photoelectrical coupler, the in-phase input end of the other end and the operational amplifier is electrically connected
Connect.
5. load circuit as claimed in claim 4, it is characterised in that also including rectification filtering module, the rectifying and wave-filtering mould
Block includes filter capacitor and second resistance, and the filter capacitor and second resistance are attempted by the output end of the operational amplifier
Between the in-phase input end of the operational amplifier.
6. load circuit as claimed in claim 5, it is characterised in that the rectification filtering module also includes diode, described
The positive pole of diode electrically connects with the output end of the operational amplifier, the negative pole of the diode by the first resistor with
The anode input electrical connection of first photoelectrical coupler；
The filter capacitor and second resistance are attempted by the negative pole of the diode and the homophase input of the operational amplifier
Between end.
7. load circuit as claimed in claim 1, it is characterised in that the alarm module includes active alarm circuit, described
Active alarm circuit electrically connects with switch module.
8. a kind of wire break detection method of load circuit, it is characterised in that applied to negative as described in claim any one of 1-7
Circuit is carried, methods described includes：
The monitoring modular is when it is zero to detect the electric current of the gate-controlled switch output end, to switch module output first
High level signal；
The switch module receives the of the output end output of first high level signal and the controller at the same time
During two high level signals, the switch module is conducting state；
The alarm module is powered when switch module is conducting state, produces broken string alarm signal and outwards exports.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711080004.5A CN107727992A (en) | 2017-11-06 | 2017-11-06 | A kind of load circuit and its wire break detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711080004.5A CN107727992A (en) | 2017-11-06 | 2017-11-06 | A kind of load circuit and its wire break detection method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107727992A true CN107727992A (en) | 2018-02-23 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711080004.5A Pending CN107727992A (en) | 2017-11-06 | 2017-11-06 | A kind of load circuit and its wire break detection method |
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| CN (1) | CN107727992A (en) |
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| CN112147537A (en) * | 2020-09-18 | 2020-12-29 | 青鸟消防股份有限公司 | Circuit and method for detecting open circuit and short circuit of load |
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