CN207398812U - A kind of load circuit - Google Patents
A kind of load circuit Download PDFInfo
- Publication number
- CN207398812U CN207398812U CN201721476177.4U CN201721476177U CN207398812U CN 207398812 U CN207398812 U CN 207398812U CN 201721476177 U CN201721476177 U CN 201721476177U CN 207398812 U CN207398812 U CN 207398812U
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- photoelectrical coupler
- operational amplifier
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- 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
- 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 17
- 230000005856 abnormality Effects 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 3
- 230000005611 electricity Effects 0.000 description 10
- 238000010438 heat treatment Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 230000032258 transport Effects 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
- 230000008569 process Effects 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 230000000694 effects 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
- 230000004044 response Effects 0.000 description 1
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Abstract
The utility model discloses a kind of load circuits, are related to field of circuit technology.The load circuit of the utility model includes controller, controllable switch, load, monitoring modular, switch module and alarm module；Controller is electrically connected with controllable switch, and controllable switch is electrically connected with load；Monitoring modular is electrically connected with the output terminal of controllable switch, and when it is zero to detect the output end current of controllable switch, the first high level signal is exported to switch module；Switch module is electrically connected respectively with controller, monitoring modular and alarm module, 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 generates broken string alarm signal and outwards exports when switch module turns on.The load circuit of the utility model can remind user to note abnormalities, so as to ensure that product quality and Electrical Safety in time when load is abnormal broken string.
Description
Technical field
The utility model is related to field of circuit technology more particularly to a kind of load circuits.
Background technology
In existing circuit, the performance loop of load is to be loaded by the break-make of controller control controllable switch with indirect control
Work, however the performance loop broken string easily loaded or load are broken down, user cannot have found such event in time,
Cause to cause production accident, there are Electrical Safety hidden danger.
In some application scenarios, the sealing of China's food packaging is generally sealed using heat pressing type, passes through temperature controller (control
Device) drive controllable switch that electrothermal tube (load) is controlled 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.It is mounted in due to electrothermal tube on the sealing briquetting of equipment reciprocating motion, in actual production
It is easy to that the failure that the electric heating route of pipe line loosens or electrothermal tube overheat is burnt occurs in the process, it is impossible to find in time, cause product
Sealing is not complete, influences product quality, there are great security risks.
Utility model content
The technical problem to be solved by the utility model is to provide a kind of load circuits of detectable circuit breaking.
To solve the above-mentioned problems, the utility model provides a kind of load circuit, including controller, controllable switch and bears
It carries, controller is electrically connected with the input terminal of controllable switch, and the output terminal of controllable switch is electrically connected with load；The load circuit also wraps
It includes：Monitoring modular is electrically connected with the output terminal of controllable switch；Switch module, respectively with controller, monitoring modular and warning mould
Block is electrically connected, and controls the working condition of alarm module；Alarm module is electrically connected with switch module.
Specifically, monitoring modular is when it is zero to detect the output end current of controllable switch, to switch module output first
High level signal；When switch module receives the second high level signal that the first high level signal and controller export at the same time
For conducting state；Alarm module is powered when switch module is conducting state, generates broken string alarm signal and outwards exports.
Specifically, controller is temperature controller or temperature control module, and controllable switch is solid-state relay.
Its further technical solution is：Monitoring modular includes current transformer and operational amplifier；Wherein, current transformer
Primary side be electrically connected with the output terminal of controllable switch, the secondary side of current transformer and the input terminal of operational amplifier are electrically connected
It connects；The output terminal of operational amplifier is electrically connected with switch module, the in-phase input end ground connection of operational amplifier.
Its further technical solution is：Switch module includes first resistor, the 4th resistance, the first photoelectrical coupler and second
Photoelectrical coupler；Wherein, the anode input terminal of the first photoelectrical coupler passes through the output terminal of first resistor and operational amplifier electricity
Connection, the cathode input terminal of the first photoelectrical coupler are electrically connected with the in-phase input end of operational amplifier, the first photoelectrical coupler
Photosensitive tube connect with the photosensitive tube of the second photoelectrical coupler, the emitter of the first photoelectrical coupler is electrically connected with alarm module；
The input terminal 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 solution is：The load circuit further includes variable resistor, one end of variable resistor and the first photoelectricity
The cathode input terminal electrical connection of coupler, the other end are electrically connected with the in-phase input end of operational amplifier.
Its further technical solution is：The load circuit further includes rectification filtering module, and rectification filtering module includes filtering
Capacitance and second resistance, filter capacitor and second resistance are attempted by the output terminal of operational amplifier and the same phase of operational amplifier
Between input terminal.
Its further technical solution is：Rectification filtering module further includes diode, the anode and operational amplifier of diode
Output terminal electrical connection, the cathode of diode is electrically connected by first resistor with the anode input terminal of the first photoelectrical coupler；Filter
Ripple capacitance and second resistance are attempted by between the cathode of diode and the in-phase input end of operational amplifier.
Its further technical solution 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 further 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 are electrically connected with the emitter of the first photoelectrical coupler；First
Output interface and the second output interface are also electrically connected with active alarm circuit.
Compared with prior art, load circuit provided by the utility model possesses burn out detection warning function, can be real-time
Monitoring signals are delivered to switch module and handled by monitoring output to the electric current loaded, when load is abnormal broken string
During event, so as to alarm module outputting alarm signal, judging result is accurate, in time user can be reminded to send out for switch module conducting
Now production is abnormal, so as to ensure that product quality and Electrical Safety.
Description of the drawings
In order to illustrate more clearly of the utility model embodiment technical solution, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is some embodiments of the utility model, for
For those of ordinary skill in the art, without creative efforts, other are can also be obtained according to these attached drawings
Attached drawing.
Fig. 1 is a kind of frame principle figure for load circuit that the utility model embodiment provides；
Fig. 2 is a kind of circuit diagram for load circuit that the utility model specific embodiment provides；
Fig. 3 is the schematic flow diagram of a kind of load circuit that the utility model embodiment provides and its wire break detection method.
Specific embodiment
The following is a combination of the drawings in the embodiments of the present utility model, the technical solution in embodiment is carried out clear, complete
Ground describes, and similar reference numerals represent similar component in attached drawing.Obviously, will be described below embodiment is only this practicality
New part of the embodiment, instead of all the embodiments.Based on the embodiment in the utility model, ordinary skill people
Member's all other embodiments obtained without creative efforts belong to the model of the utility model protection
It encloses.
It should be appreciated that ought use in this specification and in the appended claims, 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 gathered.
It is it is also understood that specific merely for the sake of describing in this utility model embodiment term used in the description
The purpose of embodiment and be not intended to limit the utility model embodiment.Such as in the utility model embodiment specification and appended power
As used in sharp claim, other situations unless the context is clearly specified, otherwise " one " of singulative, "one"
And "the" is intended to include plural form.
The load circuit of the utility model is on the basis of existing load circuit, increases the alarm of load circuit burn out detection newly
Correlation module, generate alarm signal when making to be supported on abnormal broken line in time, user reminded to find circuit question in time, it is applicable
In all load circuits, load is particularly suitable for as in the circuit of heating tube.
Referring to Fig. 1, for the schematic block diagram of the utility model load circuit, as seen from the figure, including controller 11, controllably open
Pass 12, load 13, monitoring modular 21, switch module 23, alarm module 24.Each component is described below：
Controller 11 is electrically connected with controllable switch 12, and controller 11 controls the working condition of controllable switch 12.Specifically,
When controller 11 is to the output high level signal of controllable switch 12, controllable switch 12 turns on；Controller 11 is exported to controllable switch 12
During low level signal, controllable switch 12 disconnects.Controllable switch 12 is electrically connected with load 13, and when controllable switch 12 turns on, is born
13 are carried to be powered and start to work；When controllable 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, however user is difficult to find such event, pole in time
Production accident is easily caused, there are great security risks.
For this purpose, in the utility model embodiment, monitoring modular 21 is set in load circuit, monitoring modular 21 with it is controllable
When the electric current for monitoring 12 output terminal of controllable switch is zero, the first high level is exported to switch module 23 for 12 electrical connection of switch
Otherwise signal, exports low level signal.Electric current is zero to specifically include following two situations：
First, the situation of normal power down, controller 11 exports low level signal to controllable switch 12, and controllable switch 12 disconnects
And the electric current of output terminal is made to be zero；
Second, the situation of abnormal power-down, when current supply circuit broken string or load 13 are broken down, although controllable 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 flowing through controllable switch 12 at this time is zero.
Switch module 23 is electrically connected respectively with monitoring modular 21, alarm module 24 and controller 11, receives monitoring modular 21
The signal exported with controller 11 controls 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 disconnects 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 12 output terminal of controllable switch 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 export low level signal, that is, normal power down situation to controllable switch 12, and 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 controllable switch output terminal
Stream is not zero, and load normal work, switch module 23 is off-state；
When switch module 23 receives the first high level signal, the electric current for showing 12 output terminal of controllable switch 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 controllable switch 12, controllable switch 12 turns on, and load 13 is powered and starts work
Make；Therefore when switch module 23 receives the second high level signal that the first high level signal and controller 11 export simultaneously i.e.
For the situation of abnormal power-down, switch module 23 is conducting state.
Alarm module 24 is electrically connected with switch module 23, and when switch module 23 is conducting state, alarm module 24 is logical
Electricity generates broken string alarm signal and simultaneously outwards exports, the situation for the broken string that enables a user to early to note abnormalities.
By the technical solution of application the present embodiment, break in current supply circuit or load 13 is broken down and is abnormal
During broken string, user can be reminded in time, so as to ensure that product quality and Electrical Safety.
With reference to Fig. 2, in some embodiments, such as the present embodiment, monitoring modular 21 includes Current Transmit and computing
Amplifier U1；The primary side of Current Transmit is electrically connected with controllable switch 12, the secondary side of Current Transmit and and computing
The input terminal electrical connection of amplifier U1, the output terminal of operational amplifier U1 are electrically connected 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 12 output terminal of controllable switch is not zero, Current Transmit primary side has operating current
By Current Transmit secondary side generates the first output, and reverse phase transports to operational amplifier U1, and operational amplifier U1 exports low electricity
Ordinary mail number；
Second, when the electric current for flowing through 12 output terminal of controllable switch is zero, Current Transmit primary side no current passes through, electricity
Current transformer CT secondary sides generate the second output, and reverse phase transports 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 terminal electricity that the anode input terminal of first photoelectrical coupler U2 passes through first resistor R1 and operational amplifier U1
Connection, the cathode input terminal of the first photoelectrical coupler U2 are electrically connected with the in-phase input end of operational amplifier U1, the first photoelectricity coupling
The photosensitive tube of clutch U2 is connected with the photosensitive tube of the second photoelectrical coupler U3, the emitter of the first photoelectrical coupler U2 and police
Show that module 24 is electrically connected；The input terminal of second photoelectrical coupler U3 is electrically connected by the 4th resistance R4 with controller 11, the second light
The photosensitive pipe collector of electric coupler U3 is electrically connected 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 input terminal of the first photoelectrical coupler U2 and the second photoelectrical coupler U3 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 input terminal of the first photoelectrical coupler U2, can prevent what the first photoelectrical coupler U2 from receiving
First high level signal voltage is excessive and breakdown；Similarly, the input terminal of the second photoelectrical coupler U3 also concatenates the 4th resistance R4.
Further, switch module 23 further includes variable resistor R3, variable resistor R3 one end and the first photoelectrical coupler U2
The electrical connection of cathode input terminal, the other end is electrically connected with the in-phase input end of operational amplifier U1.
It should be noted that when the electric current for flowing through 12 output terminal of controllable switch 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.For this purpose, before normal use, it is necessary to be a desired value by the resistance value debugging of variable resistor R3, so that 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
It is turned on during the high level signal of U1 outputs.
Further, alarm module 24 is active alarm circuit, including the first output interface LG1 and the second output interface
LG2；First output interface LG1 is electrically connected with the photosensitive pipe collector of the second photoelectrical coupler U3, the second output interface LG2 and
The photosensitive tube emitter electrical connection of one photoelectrical coupler U2；First output interface LG1 and the second output interface LG2 also with active report
Alert circuit 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 made to be powered and generates broken string alarm signal and outwards exports.
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 so that user to be reminded to 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 so that user to be reminded to 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, the load circuit of the utility model further includes rectification filtering module 22, including filter capacitor C1 and
Second resistance R2；Filter capacitor C1 and second resistance R2 is attempted by the output terminal of operational amplifier U1 with operational amplifier U1's
Between in-phase input end, the signal that operational amplifier U1 is exported is made more to stablize, reduce interference of the alternation pulse ripple to circuit.
Further, rectification filtering module 22 further includes diode D1, and the anode of diode D1 is with operational amplifier U1's
Output terminal is electrically connected, and the cathode of diode D1 is electrically connected by first resistor R1 and the anode input terminal of the first photoelectrical coupler U2
It connects；Filter capacitor C1 and second resistance R2 be attempted by the cathode of diode D1 and operational amplifier U1 in-phase input end it
Between.
Referring to Fig. 3, the utility model embodiment provides the wire break detection method of load circuit, and this method is applied to foregoing reality
In the load circuit for applying example, 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 controllable switch output terminal
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 controllable switch, and controllable switch is disconnected and made defeated
The electric current of outlet is zero；
Second, the situation of abnormal power-down, when current supply circuit broken string or load are broken down, although controllable switch still in
Conducting state, but due to line broken circuit or load internal fault, the electric current for flowing through controllable switch at this time 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 controllable switch output terminal
It is zero, the situation including 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 controllable switch, thus the state that controllable switch is on may be used
To conclude at this time for the situation of abnormal power-down, so as to which switch module for conducting state and controls alarm module to turn on.
S303, alarm module are turned on when switch module is conducting state, are generated broken string alarm signal and are outwards exported.
In specific implementation, alarm module is turned on when switch module is conducting state, and generation broken string alarm signal is simultaneously outside
Output enables a user to early find that load abnormal breaks.
By the technical solution of application the present embodiment, break in current supply circuit or load is broken down and is abnormal disconnected
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 the present embodiment, load 13 is heater R5, and controller 11 is
Temperature controller TC, controllable 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 the design temperature of temperature controller TC is more than actual temperature, from
Temperature controller TC exports the second high level signal to the input terminal of solid-state relay SSR, and the input terminal for making solid-state relay SSR is 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
The input terminal of R4 to the second photoelectrical coupler U3, 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,
The input terminal that Current Transmit secondary side generates the first output to operational amplifier U1 makees anti-phase input, at this time from operation amplifier
The output terminal of device U1 exports low level to the input terminal of the first photoelectrical coupler U2, and the first photoelectrical coupler U2 is not led
It is logical.Since 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 the input circuit of PLC be made to be powered, broken string alarm signal will not be generated.
Situation 2, when actual temperature is greater than or equal to the design temperature of temperature controller CT, temperature controller CT output low levels, Gu
The electric current of state relay SSR outputs is zero, and control heater R5 is normally stopped.Since Current Transmit primary side is without electricity
Stream passes through, and Current Transmit secondary side generates the second output, and reverse phase transports to operational amplifier U1, from the defeated of operational amplifier U1
Outlet exports the first high level signal, 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 the input circuit of PLC
It is powered, broken string alarm signal will not be generated.
Situation 3, current supply circuit broken string, heater R5 failures or the heater R5 power switches of heater R5 are jumped
Lock, when being abnormal broken string, Current Transmit primary side no current is by the way that it is defeated that Current Transmit secondary side generates second
Go out, reverse phase transports to operational amplifier U1, the first high level signal is exported from the output terminal of operational amplifier U1, 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 the input circuit of PLC, which is powered, generates broken string report
Alert signal, control device automatic alarm are shut down.
By applying the load circuit of the utility model, when detecting that load circuit broken string or load are broken down,
Timely alarm response reminds user to note abnormalities the situation of broken string, substandard product is avoided to generate, improves Electrical Safety.
In some embodiments, the model of temperature controller TC is preferably AI-518D2G, certainly, in other embodiments, the temperature
The model of control device TC can also select other types, and the utility model does not limit this.
In some 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 utility model does not limit this.
In some embodiments, the model of operational amplifier U1 is preferably 0P07CP, and certainly, operational amplifier U1 may be used also
To select other types, the utility model does not limit this.
In some embodiments, the model of the first photoelectrical coupler U2 and the second photoelectrical coupler U3 are both preferably
TLP521-1, certainly, the model of the first photoelectrical coupler U2 and the second photoelectrical coupler U3 can also select other types, this
Utility model does not limit this.
In the above-described embodiments, all emphasize particularly on different fields to the description of each embodiment, be not described in some embodiment
Part, may refer to the associated description of other embodiment.
The above is specific embodiment of the present utility model, but the scope of protection of the utility model is not limited to
This, in the technical scope that any one skilled in the art discloses in the utility model, can readily occur in various etc.
The modifications or substitutions of effect, these modifications or substitutions should be covered within the scope of the utility model.Therefore, this practicality is new
The protection domain of type should be subject to the protection scope in claims.
Claims (7)
1. a kind of load circuit, including controller, controllable switch and load, the controller is electrically connected with the controllable switch
It connects, the controllable switch is electrically connected with the load, which is characterized in that further include monitoring modular, switch module and warning mould
Block；The monitoring modular is electrically connected with the controllable switch；The switch module respectively with the controller, the monitoring modular
And the alarm module electrical connection.
2. load circuit as described in claim 1, which is characterized in that the monitoring modular includes current transformer and computing is put
Big device；
The primary side of the current transformer is electrically connected with the controllable switch, the secondary side of the current transformer and the fortune
Calculate the input terminal electrical connection of amplifier；
The output terminal of the operational amplifier is electrically connected with the switch module, the homophase input termination of the operational amplifier
Ground.
3. load circuit as claimed in claim 2, which is characterized in that the switch module include first resistor, the 4th resistance,
First photoelectrical coupler and the second photoelectrical coupler；
The anode input terminal of first photoelectrical coupler is electrically connected by first resistor with the output terminal of the operational amplifier,
The cathode input terminal of first photoelectrical coupler is electrically connected 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 of first photoelectrical coupler and institute
State alarm module electrical connection；
The input terminal of second photoelectrical coupler is electrically connected by the 4th resistance with the controller, second photoelectric coupling
The photosensitive pipe collector of device is electrically connected with the alarm module.
4. load circuit as claimed in claim 3, which is characterized in that further include variable resistor, one end of the variable resistor
It is electrically connected with the cathode input terminal of first photoelectrical coupler, the in-phase input end of the other end and the operational amplifier is electrically connected
It connects.
5. load circuit as claimed in claim 4, which is characterized in that further include 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 terminal of the operational amplifier
Between the in-phase input end of the operational amplifier.
6. load circuit as claimed in claim 5, which is characterized in that the rectification filtering module further includes diode, described
The anode of diode is electrically connected with the output terminal of the operational amplifier, the cathode of the diode by the first resistor with
The anode input terminal electrical connection of first photoelectrical coupler；
The filter capacitor and second resistance are attempted by the cathode of the diode and the homophase input of the operational amplifier
Between end.
7. load circuit as described in claim 1, which is characterized in that the alarm module includes active alarm circuit, described
Active alarm circuit is electrically connected with switch module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721476177.4U CN207398812U (en) | 2017-11-06 | 2017-11-06 | A kind of load circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721476177.4U CN207398812U (en) | 2017-11-06 | 2017-11-06 | A kind of load circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207398812U true CN207398812U (en) | 2018-05-22 |
Family
ID=62325539
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721476177.4U Expired - Fee Related CN207398812U (en) | 2017-11-06 | 2017-11-06 | A kind of load circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207398812U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107727992A (en) * | 2017-11-06 | 2018-02-23 | 李娟� | A kind of load circuit and its wire break detection method |
-
2017
- 2017-11-06 CN CN201721476177.4U patent/CN207398812U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107727992A (en) * | 2017-11-06 | 2018-02-23 | 李娟� | A kind of load circuit and its wire break detection method |
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Granted publication date: 20180522 |