CN104793094B - Detection circuit and method for electric heater and electric heating system - Google Patents
Detection circuit and method for electric heater and electric heating system Download PDFInfo
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- CN104793094B CN104793094B CN201410030107.0A CN201410030107A CN104793094B CN 104793094 B CN104793094 B CN 104793094B CN 201410030107 A CN201410030107 A CN 201410030107A CN 104793094 B CN104793094 B CN 104793094B
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- 238000001514 detection method Methods 0.000 title claims abstract description 34
- 238000005485 electric heating Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title abstract description 23
- 238000010438 heat treatment Methods 0.000 claims abstract description 163
- 230000005611 electricity Effects 0.000 claims description 22
- 238000009434 installation Methods 0.000 claims description 11
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Abstract
The invention discloses a detection circuit and method for an electric heater and an electric heating system. Wherein, this detection circuitry includes: a current detector connected between the power supply and the heating wire of the electric heater for detecting a first current; the current transformer is connected with the heating wire and used for detecting second current of the heating wire; and the processor is respectively connected with the current detector and the current transformer and is used for determining the running state of the electric heater according to the first current and the second current. According to the invention, the problem that the running condition of the electric heater cannot be monitored in the prior art is solved, and the effect of accurately acquiring the running state of the electric heater is realized.
Description
Technical field
The present invention relates to electric heater control field, in particular to a kind of detection circuit for electric heater and
Method, electric heating system.
Background technology
Currently without the monitoring device used in electric heater operation, due to can not be carried out to the operating status of electric heater
Monitoring, so as to realize the fault verification of electric heater, so as to which appropriate response cannot be made when mechanical disorder
Protect machine and the safety of user.
The problem of for the operating condition that can not monitor electric heater in the prior art, not yet proposes effective solve at present
Scheme.
The content of the invention
The problem of for the operating condition that electric heater can not be monitored in correlation technique, not yet proposes effective solve at present
Scheme, for this purpose, it is a primary object of the present invention to provide a kind of detection circuit for electric heater and method, electrical heating system
System, to solve the above problems.
To achieve these goals, according to an aspect of the invention, there is provided a kind of detection electricity for electric heater
Road, the detection circuit include：Current detector is connected between power supply and the heating wire of electric heater, for detecting the first electricity
Stream；Current transformer is connected with heating wire, for detecting the second electric current of heating wire；Processor, respectively with current detector and
Current transformer connects, for determining the operating status of electric heater according to the first electric current and the second electric current.
Further, current detector includes：First current detector, is connected between power firestreak and heating wire, uses
In detecting the first electron current；And/or second current detector, it is connected between zero-power line and heating wire, for detecting second
Electron current, wherein, the first electric current includes the first electron current and/or the second electron current.
Further, current transformer includes：First electron current mutual inductor, is connected to the first current detector and heating wire
Between, for detecting the 3rd electron current of heating wire；And/or the second electron current mutual inductor, be connected to the second current detector with
Between heating wire, for detecting the 4th electron current of heating wire；Wherein, the second electric current includes the 3rd electron current and/or the 4th son
Electric current.
To achieve these goals, according to an aspect of the invention, there is provided a kind of electric heating system, the system bag
It includes：For the detection circuit of electric heater, detection circuit includes at least one current transformer；Electric heater, including heating wire
Device, electric wire installation include at least a heating wire, and each heating wire is connected respectively with a current transformer.
Further, electric wire installation includes the first sub- heating wire, wherein, electric heater further includes：First relay, even
It is connected between power firestreak and the first sub- heating wire；Second relay is connected between zero-power line and the first sub- heating wire.
Further, electric wire installation includes the second sub- heating wire and the 3rd sub- heating wire, wherein, electric heater also wraps
It includes：3rd relay is connected between power firestreak and the second sub- heating wire；4th relay is connected to zero-power line and
Between two sub- heating wire；5th relay is connected between power firestreak and the 3rd sub- heating wire；6th relay, is connected to
Between zero-power line and the 3rd sub- heating wire.
To achieve these goals, according to an aspect of the invention, there is provided a kind of detection side for electric heater
Method, the detection method include：The first electric current between detection power supply and the heating wire of electric heater and flow through the second of heating wire
Electric current；The operating status of electric heater is determined according to the first electric current and the second electric current.
Further, detect the first electric current between power supply and the heating wire of electric heater and flow through the second electricity of heating wire
The step of stream, includes：Between connection heating wire and power firestreak in the case of circuit, the electric heating of power supply and electric heater is detected
The first electron current between silk；And/or between connection heating wire and zero-power line in the case of circuit, detection power supply adds with electricity
The second electron current between the heating wire of hot device, wherein, the first electric current includes the first electron current and the second electron current；According to first
The step of electric current and the second electric current determine the operating status of electric heater includes：In the first electron current and/or the second electron current
In the case that current value is zero or meets default minimum current value, determine that the casing of heating wire and electric heater is on
State.
Further, the step of determining the operating status of electric heater according to the first electric current and the second electric current includes：
In the case that the current value of one electron current is zero, and the current value of the second electron current is not zero, heating wire and heating wire are determined
Zero line side is broken and is turned on casing；It is not zero in the current value of the first electron current, and the current value of the second electron current is zero
In the case of, it determines the zero line fracture of heating wire and heating wire and is turned on casing.
Using the present invention, the electric current for flowing through heating wire and heating wire and electricity are detected by current detector and current transformer
The electric current of circuit between source can judge whether the operating status of electric heater is normal according to the electric current detected, can basis
The electric current detected accurately examines the break-make and its abnormality to each heating wire section, while can detect that relay adds to electricity
The reliability of the wiring connection of hot device, so as to the malfunction of accurate judgement electric heater, so as to solve the prior art
In the operating condition that can not monitor electric heater the problem of, realize the effect of the accurate operating status for obtaining electric heater.
Description of the drawings
Attached drawing described herein is used for providing a further understanding of the present invention, forms the part of the application, this hair
Bright schematic description and description does not constitute improper limitations of the present invention for explaining the present invention.In the accompanying drawings：
Fig. 1 is the structure diagram of the detection circuit for electric heater according to embodiments of the present invention；
Fig. 2 is the structure diagram of electric heating system according to embodiments of the present invention；And
Fig. 3 is the flow chart of the detection method for electric heater according to embodiments of the present invention.
Specific embodiment
In order to which those skilled in the art is made to more fully understand the present invention program, below in conjunction in the embodiment of the present invention
The technical solution in the embodiment of the present invention is clearly and completely described in attached drawing, it is clear that described embodiment is only
The embodiment of a part of the invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
Member's all other embodiments obtained without making creative work should all belong to the model that the present invention protects
It encloses.
It should be noted that term " first " in description and claims of this specification and above-mentioned attached drawing, "
Two " etc. be the object for distinguishing similar, without being used to describe specific order or precedence.It should be appreciated that it so uses
Data can exchange in the appropriate case, so as to the embodiment of the present invention described herein can with except illustrating herein or
Order beyond those of description is implemented.In addition, term " comprising " and " having " and their any deformation, it is intended that cover
Cover it is non-exclusive include, be not necessarily limited to for example, containing the process of series of steps or unit, method, system, product or equipment
Those steps or unit clearly listed, but may include not list clearly or for these processes, method, product
Or the intrinsic other steps of equipment or unit.
Fig. 1 is the structure diagram of the detection circuit for electric heater according to embodiments of the present invention.As shown in Figure 1,
The detection circuit can include：Current detector 10 is connected between power supply 20 and the heating wire 40 of electric heater, for detecting
First electric current；Current transformer 30 is connected with heating wire 40, for detecting the second electric current of heating wire 40；Processor 50, respectively
It is connected with current detector 10 and current transformer 30, for determining the operation of electric heater according to the first electric current and the second electric current
State.
Using the present invention, the electric current for flowing through heating wire and heating wire and electricity are detected by current detector and current transformer
The electric current of circuit between source can judge whether the operating status of electric heater is normal according to the electric current detected, can basis
The electric current detected accurately examines the break-make and its abnormality to each heating wire section, while can detect that relay adds to electricity
The reliability of the wiring connection of hot device, so as to the malfunction of accurate judgement electric heater, so as to solve the prior art
In the operating condition that can not monitor electric heater the problem of, realize the effect of the accurate operating status for obtaining electric heater.
According to the abovementioned embodiments of the present invention, current detector can include：First current detector L1, is connected to power supply
Between firewire and heating wire, for detecting the first electron current；And/or the second current detector L2, it is connected to zero-power line and electricity
Between heated filament, for detecting the second electron current, wherein, the first electric current includes the first electron current and/or the second electron current.
Further, current transformer includes：First electron current mutual inductor, is connected to the first current detector and heating wire
Between, for detecting the 3rd electron current of heating wire；And/or the second electron current mutual inductor, be connected to the second current detector with
Between heating wire, for detecting the 4th electron current of heating wire；Wherein, the second electric current includes the 3rd electron current and/or the 4th son
Electric current.
As shown in Fig. 2, the device and corresponding parameter in figure can progressively increase according to actual use demand or reduce quantity, it can
It, can also be by N can be made of according to actual use situation electric heater independent one section of heating wire（N≥1）Duan Zucheng's
Electric heating system.In the system block diagram shown in Fig. 2, the first current detector L1 and the second current detector L2 can be deposited simultaneously
Can also individualism the first current detector L1 or the second current detector L2；Heating wire in electric heater
The number change of hop count can also be in the heating wire HEATX of each section of electric heater（X therein is natural number, represents heating wire
Sequence number）The the first electron current mutual inductor LX1 and the second electron current mutual inductor LX2 that upper independence places branch simultaneously are detected jointly
Electric current equally can independently increase by the first electron current mutual inductor LX1 on each section of electric heater HEATX or the second electron current is mutual
One in sensor LX2 detects electric current, by above-described embodiment, can be gathered according to current detector and current transformer
Electric current directly, accurately individually examines break-make and its abnormality to each electric heating wire section simultaneously, and can detect relay
The reliability that the wiring of device to electric heater connects.
It in the above-described embodiments, can be according to current detector（It can also be realized by current transformer）With each electric heating
Current transformer collocation in silk branch, which exists, to be used or simultaneously using being detected, specifically, each current detector and electricity
The parameter of current transformer considers specified standards value, deviation（That is the accuracy tolerance and power-supply system of device in itself in each condition
Fluctuation）, adjusted according to use environment and component variations are actual.Processor is by comparing the first current detector L1 or the
Two current detector L2, the difference of each branch current LX1-LX2, LX3-LX4, LX5-LX6 detect each relay of electric heater
The patch cord correctness of connection reliability and electric heater between power cord.Wherein, electric heating system bag shown in Figure 2
Three heating wire are included, the current transformer one on three heating wire shares 6, is respectively above-mentioned LX1-LX6.
As shown in Fig. 2, K1-K6 electrically heated relays in order to control, HEAT1-HEAT3 is the heating wire of electric heater, IL1
To flow through the first electron current of the first current detector L1, IL2 is the second electron current for flowing through the second current detector L2；
IHEAT1 is the reference current value of heating wire section HEAT1；IHEAT2 is the reference current value of heating wire section HEAT2；IHEAT3 is
The reference current value of heating wire HEAT3.
As shown in Fig. 2, when electric heating system powers on for the first time, IL1 and IL2 is detected respectively whether to judge heating wire
It is turned on casing, IL1 is detected respectively as independent attracting electric relay K1, K3, K5（Namely it needs to detect three times）If often
The value of the secondary IL1 detected be zero either current value do not change, the value of IL1 or meet default minimum current value, then may be used
Casing is not turned on the zero line for judging HEAT1-HEAT3；Similarly, detected respectively as independent attracting electric relay K2, K4, K6
IL2, if during per being individually attracted a relay, the value of the IL2 measured be zero either electric current do not change or meet pre-
If minimum current value, then it can be determined that the zero line side of HEAT1-HEAT3 is not turned on casing.In above-mentioned test process, find
Any one stage is more than some setting value there are electric current or current value, it may be considered that heating wire and casing conducting, at this point,
Main controller makes electric heater after the signal of operating status of heating wire that processor determines and casing conducting is received
Respective handling measure.
In fig. 2, K1 and K2 controls HEAT1, K3 and K4 controls HEAT2, K5 and K6 control HEAT3.Divide by taking HEAT1 as an example
Analyse explanation：Such as when relay K1 is attracted, the current value of IL1 is zero, and IL2 has electric current when relay K2 is attracted,
Then processor judges that HEAT1 zero line sides have been broken and have been turned on casing；If the current value of IL2 is zero and IL1 has electric current, locate
Reason device determines that HEAT1 zero lines have been broken and have been turned on casing.Each heating wire shown in Figure 2 can detect successively.
Specifically, in first power on, while attracting electric relay K1 and K2, whether detection current value IL1 and IL2 be equal,
If unequal, it is believed that HEAT1 or its attachment have been turned on casing, can equally detect according to this HEAT2, HEAT3 or its
Whether attachment turns on casing.
In the above embodiment of the present invention, in the operational process of electric heater, IL2 and IL1 are fixed value, be should be
The aggregate value of IHEAT1, IHEAT2, IHEAT3, the IL2 or the current value of IL1 detected be less than IHEAT1, IHEAT2 and
In IHEAT3 in the case of the sum of any two current value, if IL2 is equal to IL1, it is believed that one of which heating wire has broken
It splits and is turned on another set, if IL2 is not equal to IL1, is believed that one group of fracture and is turned on casing.If for example, IL2=
IL1, and IL2<IHEAT1+IHEAT2, it is determined that HEAT1 or HEAT2 fractures, and the heating wire being broken is turned on HEAT3.
In the normal operation of electric heater, if the parameter value of IL2 or IL1 reduces suddenly, and the value reduced is just
The sum of the one of value of IHEAT1, IHEAT2, IHEAT3 or several values, then can judge accordingly be HEAT1, HEAT3,
HEAT3 one of which or several groups of heating wire fractures.Such as IHEAT1=1A, IHEAT2=2A, IHEAT3=3A, in the process of running
IL1 becomes 5.5A by 6A suddenly, considers that deviation is disregarded, if IL2 is also 5.5A, it is believed that heating wire have fracture and part and its
He turns on heating wire；If IL2 is not equal to 5.5A, it is believed that heating wire has fracture and part is turned on casing.
The present invention also provides a kind of electric heating system, which includes：Use in above-described embodiment described in any one
In the detection circuit of electric heater, detection circuit includes at least one current transformer；Electric heater, including electric wire installation,
Electric wire installation includes at least a heating wire, and each heating wire is connected respectively with a current transformer.
Using the present invention, the electric current for flowing through heating wire and heating wire and electricity are detected by current detector and current transformer
The electric current of circuit between source can judge whether the operating status of electric heater is normal according to the electric current detected, can basis
The electric current detected accurately examines the break-make and its abnormality to each heating wire section, while can detect that relay adds to electricity
The reliability of the wiring connection of hot device, so as to the malfunction of accurate judgement electric heater, so as to solve the prior art
In the operating condition that can not monitor electric heater the problem of, realize the effect of the accurate operating status for obtaining electric heater.
In the above embodiment of the present invention, as shown in Fig. 2, electric wire installation includes the first sub- heating wire HEAT1,
In, electric heater further includes：First relay K1 is connected between power firestreak and the first sub- heating wire；Second relay K2,
It is connected between zero-power line and the first sub- heating wire.
In the electric heating system shown in Fig. 2, electric wire installation can also include of the second sub- heating wire HEAT2 and the 3rd
Heating wire HEAT3, wherein, electric heater can also include：3rd relay K3 is connected to power firestreak and the second sub- heating wire
Between；4th relay K4 is connected between zero-power line and the second sub- heating wire；5th relay K5 is connected to power supply fire
Between line and the 3rd sub- heating wire；6th relay K6 is connected between zero-power line and the 3rd sub- heating wire.
As shown in Fig. 2, the device and corresponding parameter in figure can progressively increase according to actual use demand or reduce quantity, it can
It, can also be by N can be made of according to actual use situation electric heater independent one section of heating wire（N≥1）Duan Zucheng's
Electric heating system.In the system block diagram shown in Fig. 2, the first current detector L1 and the second current detector L2 can be deposited simultaneously
Can also individualism the first current detector L1 or the second current detector L2；Heating wire in electric heater
The number change of hop count can also be in the heating wire HEATX of each section of electric heater（X therein is natural number, represents heating wire
Sequence number）The the first electron current mutual inductor LX1 and the second electron current mutual inductor LX2 that upper independence places branch simultaneously are detected jointly
Electric current equally can independently increase by the first electron current mutual inductor LX1 on each section of electric heater HEATX or the second electron current is mutual
One in sensor LX2 detects electric current, by above-described embodiment, can be gathered according to current detector and current transformer
Electric current directly, accurately individually examines break-make and its abnormality to each electric heating wire section simultaneously, and can detect relay
The reliability that the wiring of device to electric heater connects.
It in the above-described embodiments, can be according to current detector（It can also be realized by current transformer）With each electric heating
Current transformer collocation in silk branch, which exists, to be used or simultaneously using being detected, specifically, current detector and electric current
The parameter of mutual inductor considers specified standards value, and deviation is adjusted according to use environment and component variations are actual.Processor passes through
Compare the first current detector L1 or the second current detector L2, the difference of each branch current LX1-LX2, LX3-LX4, LX5-LX6
It is different, detect the patch cord correctness of the connection reliability and electric heater between each relay of electric heater and power cord.Its
In, electric heating system shown in Figure 2 includes three heating wire, and the current transformer one on three heating wire shares 6, point
LX1-LX6 that Wei be not above-mentioned.
As shown in Fig. 2, K1-K6 electrically heated relays in order to control, HEAT1-HEAT3 is the heating wire of electric heater, IL1
To flow through the first electron current of the first current detector L1, IL2 is the second electron current for flowing through the second current detector L2；
IHEAT1 is the reference current value of heating wire section HEAT1；IHEAT2 is the reference current value of heating wire section HEAT2；IHEAT3 is
The reference current value of heating wire HEAT3.
As shown in Fig. 2, when electric heating system powers on for the first time, IL1 and IL2 is detected respectively whether to judge heating wire
It is turned on casing, IL1 is detected respectively as independent attracting electric relay K1, K3, K5（Namely it needs to detect three times）If often
The value of the secondary IL1 detected is zero or more than default turn on current value, then can be determined that the zero line of HEAT1-HEAT3 does not have
Turn on casing；Similarly, IL2 is detected respectively as independent attracting electric relay K2, K4, K6, if per individually one relay of actuation
When, the value of the IL2 measured is zero or meets minimum current value, then can be determined that the zero line side of HEAT1-HEAT3 is not turned on
Casing.In above-mentioned test process, it is found that any one stage there are electric current or current value is more than some setting value, then it can be with
Heating wire and casing conducting are thought, at this point, main controller is receiving the operation shape of heating wire that processor determines and casing conducting
After the signal of state, respective handling measure is made to electric heater.
In fig. 2, K1 and K2 controls HEAT1, K3 and K4 controls HEAT2, K5 and K6 control HEAT3.Divide by taking HEAT1 as an example
Analyse explanation：Such as when relay K1 is attracted, the current value of IL1 is zero, and IL2 has electric current when relay K2 is attracted,
Then processor judges that HEAT1 zero line sides have been broken and have been turned on casing；If the current value of IL2 is zero and IL1 has electric current, locate
Reason device determines that HEAT1 zero lines have been broken and have been turned on casing.Each heating wire shown in Figure 2 can detect successively.
Specifically, in first power on, while attracting electric relay K1 and K2, whether detection current value IL1 and IL2 be equal,
If unequal, it is believed that HEAT1 or its attachment have been turned on casing, can equally detect according to this HEAT2, HEAT3 or its
Whether attachment turns on casing.
In the above embodiment of the present invention, in the operational process of electric heater, IL2 and IL1 are fixed value, be should be
The aggregate value of IHEAT1, IHEAT2, IHEAT3, the IL2 or the current value of IL1 detected be less than IHEAT1, IHEAT2 and
In IHEAT3 in the case of the sum of any two current value, if IL2 is equal to IL1, it is believed that one of which heating wire has broken
It splits and is turned on another set, if IL2 is not equal to IL1, is believed that one group of fracture and is turned on casing.If for example, IL2=
IL1, and IL2<IHEAT1+IHEAT2, it is determined that HEAT1 or HEAT2 fractures, and the heating wire being broken is turned on HEAT3.
In the normal operation of electric heater, if the parameter of IL2 or IL1 reduces suddenly, IHEAT1, IHEAT2, IHEAT3
One of value or several values reduce suddenly, then can judge it is HEAT1, HEAT3, HEAT3 one of which or several accordingly
Group heating wire fracture.Such as IHEAT1=1A, IHEAT2=2A, IHEAT3=3A, IL1 becomes 5.5A by 6A suddenly in the process of running,
Consider that deviation is disregarded, if IL2 is also 5.5A, it is believed that HEAT1 is broken and part is turned on other heating wire；If IL2 etc.
In 5.5A, then it is believed that HEAT1 fractures and part turn on casing, if IL1 becomes 5A by 6A suddenly, and if IL2 is equal to IL1
It is considered that HEAT1 is broken.
Fig. 3 is the flow chart of the detection method for electric heater according to embodiments of the present invention, this method as shown in Figure 3
Include the following steps：
Step S302 detects the first electric current between power supply and the heating wire of electric heater and flows through the second electricity of heating wire
Stream.
Step S304 determines the operating status of electric heater according to the first electric current and the second electric current.
Using the present invention, the electric current for flowing through heating wire and heating wire and electricity are detected by current detector and current transformer
The electric current of circuit between source can judge whether the operating status of electric heater is normal according to the electric current detected, can basis
The electric current detected accurately examines the break-make and its abnormality to each heating wire section, while can detect that relay adds to electricity
The reliability of the wiring connection of hot device, so as to the malfunction of accurate judgement electric heater, so as to solve the prior art
In the operating condition that can not monitor electric heater the problem of, realize the effect of the accurate operating status for obtaining electric heater.
In the above embodiment of the present invention, detect the first electric current between power supply and the heating wire of electric heater and flow through
The step of second electric current of heating wire, includes：Between connection heating wire and power firestreak in the case of circuit, detection power supply with
The first electron current between the heating wire of electric heater；And/or between connection heating wire and zero-power line in the case of circuit,
The second electron current between power supply and the heating wire of electric heater is detected, wherein, the first electric current includes the first electron current and second
Electron current；The step of determining the operating status of electric heater according to the first electric current and the second electric current includes：The first electron current and/
Or second electron current current value be zero or meet default minimum current value in the case of, determine heating wire and electric heater
The state that casing is on.
According to the abovementioned embodiments of the present invention, the operating status of electric heater is determined according to the first electric current and the second electric current
Step includes：The first electron current current value be zero and second electron current current value be not zero in the case of, determine electric heating
Silk is broken with the zero line side of heating wire and is turned on casing；It is not zero in the current value of the first electron current, and the second electron current
In the case that current value is zero, determines the zero line fracture of heating wire and heating wire and turned on casing.
As shown in Fig. 2, when electric heating system powers on for the first time, IL1 and IL2 is detected respectively whether to judge heating wire
It is turned on casing, IL1 is detected respectively as independent attracting electric relay K1, K3, K5（Namely it needs to detect three times）If often
The value of the secondary IL1 detected is zero or more than default turn on current value, then can be determined that the zero line of HEAT1-HEAT3 does not have
Turn on casing；Similarly, IL2 is detected respectively as independent attracting electric relay K2, K4, K6, if per individually one relay of actuation
When, the value of the IL2 measured is zero or meets minimum current value, then can be determined that the zero line side of HEAT1-HEAT3 is not turned on
Casing.In above-mentioned test process, it is found that any one stage there are electric current or current value is more than some setting value, then it can be with
Heating wire and casing conducting are thought, at this point, main controller is receiving the operation shape of heating wire that processor determines and casing conducting
After the signal of state, respective handling measure is made to electric heater.
In fig. 2, K1 and K2 controls HEAT1, K3 and K4 controls HEAT2, K5 and K6 control HEAT3.Divide by taking HEAT1 as an example
Analyse explanation：Such as when relay K1 is attracted, the current value of IL1 is zero, and IL2 has electric current when relay K2 is attracted,
Then processor judges that HEAT1 zero line sides have been broken and have been turned on casing；If the current value of IL2 is zero and IL1 has electric current, locate
Reason device determines that HEAT1 zero lines have been broken and have been turned on casing.Each heating wire shown in Figure 2 can detect successively.
Specifically, in first power on, while attracting electric relay K1 and K2, whether detection current value IL1 and IL2 be equal,
If unequal, it is believed that HEAT1 or its attachment have been turned on casing, can equally detect according to this HEAT2, HEAT3 or its
Whether attachment turns on casing.
In the above embodiment of the present invention, in the operational process of electric heater, IL2 and IL1 are fixed value, be should be
The aggregate value of IHEAT1, IHEAT2, IHEAT3, the IL2 or the current value of IL1 detected be less than IHEAT1, IHEAT2 and
In IHEAT3 in the case of the sum of any two current value, if IL2 is equal to IL1, it is believed that one of which heating wire has broken
It splits and is turned on another set, if IL2 is not equal to IL1, is believed that one group of fracture and is turned on casing.If for example, IL2=
IL1, and IL2<IHEAT1+IHEAT2, it is determined that HEAT1 or HEAT2 fractures, and the heating wire being broken is turned on HEAT3.
In the normal operation of electric heater, if the parameter of IL2 or IL1 reduces suddenly, IHEAT1, IHEAT2, IHEAT3
One of value or several values reduce suddenly, then can judge it is HEAT1, HEAT3, HEAT3 one of which or several accordingly
Group heating wire fracture.Such as IHEAT1=1A, IHEAT2=2A, IHEAT3=3A, IL1 becomes 5.5A by 6A suddenly in the process of running,
Consider that deviation is disregarded, if IL2 is also 5.5A, it is believed that HEAT1 is broken and part is turned on other heating wire；If IL2 etc.
In 5.5A, then it is believed that HEAT1 fractures and part turn on casing, if IL1 becomes 5A by 6A suddenly, and if IL2 is equal to IL1
It is considered that HEAT1 is broken.
In the above-described embodiments by detecting the difference of comparison both ends electric current IL2 and IL1 and the operation electricity of electric heater
Stream IHEAT1, IHEAT2, IHEAT3 situation of change judge electric heater whether closely damaged or operational process in electrical heating
The safe operation situation of device specifically, can detect whether electric heating wire has been broken, which section can detect in each section is specifically
Heating wire is broken, and can detect whether heating wire has even turned on casing, which Duan Yuji can be detected after heating wire is broken is
Shell turns on.
It should be noted that step shown in the flowchart of the accompanying drawings can be in such as a group of computer-executable instructions
It is performed in computer system, although also, show logical order in flow charts, it in some cases, can be with not
The order being same as herein performs shown or described step.
It can be seen from the above description that the present invention realizes following technique effect：
Using the present invention, the electric current for flowing through heating wire and heating wire and electricity are detected by current detector and current transformer
The electric current of circuit between source can judge whether the operating status of electric heater is normal according to the electric current detected, can basis
The electric current detected accurately examines the break-make and its abnormality to each heating wire section, while can detect that relay adds to electricity
The reliability of the wiring connection of hot device, so as to the malfunction of accurate judgement electric heater, so as to solve the prior art
In the operating condition that can not monitor electric heater the problem of, realize the effect of the accurate operating status for obtaining electric heater.
Obviously, those skilled in the art should be understood that each module of the above-mentioned present invention or each step can be with general
Computing device realize that they can concentrate on single computing device or be distributed in multiple computing devices and be formed
Network on, optionally, they can be realized with the program code that computing device can perform, it is thus possible to which they are stored
In the storage device by computing device come perform either they are fabricated to respectively each integrated circuit modules or by they
In multiple modules or step be fabricated to single integrated circuit module to realize.In this way, the present invention is not limited to any specific
Hardware and software combines.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of detection circuit for electric heater, which is characterized in that including：
Current detector is connected between power supply and the heating wire of electric heater, for detecting the first electric current；
Current transformer is connected with the heating wire, for detecting the second electric current of the heating wire；
Processor is connected respectively with the current detector and the current transformer, for according to first electric current and institute
State the operating status that the second electric current determines the electric heater, when first power on, judge heating wire whether with machine
Shell turns on.
2. detection circuit according to claim 1, which is characterized in that the current detector includes：
First current detector is connected between power firestreak and the heating wire, for detecting the first electron current；And/or the
Two current detectors are connected between zero-power line and the heating wire, for detecting the second electron current,
Wherein, first electric current includes the first electron current and/or the second electron current.
3. detection circuit according to claim 1, which is characterized in that the current transformer includes：
First electron current mutual inductor is connected between first current detector and the heating wire, for detecting the electricity
3rd electron current of heated filament；And/or
Second electron current mutual inductor is connected between second current detector and the heating wire, for detecting the electricity
4th electron current of heated filament；
Wherein, second electric current includes the 3rd electron current and/or the 4th electron current.
4. a kind of electric heating system, which is characterized in that including：
The detection circuit for electric heater in claims 1 to 3 described in any one, the detection circuit include at least one
A current transformer；
Electric heater, including electric wire installation, the electric wire installation includes at least a heating wire, each heating wire point
It is not connected with a current transformer.
5. electric heating system according to claim 4, which is characterized in that the electric wire installation includes the first sub- electric heating
Silk,
Wherein, the electric heater further includes：
First relay is connected between power firestreak and the first sub- heating wire；
Second relay is connected between zero-power line and the first sub- heating wire.
6. electric heating system according to claim 4 or 5, which is characterized in that the electric wire installation includes the second son electricity
Heated filament and the 3rd sub- heating wire, wherein, the electric heater further includes：
3rd relay is connected between power firestreak and the second sub- heating wire；
4th relay is connected between zero-power line and the second sub- heating wire；
5th relay is connected between the power firestreak and the 3rd sub- heating wire；
6th relay is connected between the zero-power line and the 3rd sub- heating wire.
7. a kind of detection method for electric heater, which is characterized in that including：
It detects the first electric current between power supply and the heating wire of electric heater and flows through the second electric current of the heating wire；
The operating status of the electric heater is determined according to first electric current and second electric current.
8. detection method according to claim 7, which is characterized in that
The step of detecting the first electric current between power supply and the heating wire of electric heater and flowing through the second electric current of the heating wire
Including：Connecting between the heating wire and power firestreak in the case of circuit, detect power supply and electric heater heating wire it
Between the first electron current；And/or connecting between the heating wire and zero-power line in the case of circuit, detection power supply adds with electricity
The second electron current between the heating wire of hot device, wherein, first electric current includes the first electron current and the second electron current；
The step of determining the operating status of the electric heater according to first electric current and second electric current includes：
It is zero in the current value of first electron current and/or the second electron current or meets the situation of default minimum current value
Under, determine the state that the casing of the heating wire and the electric heater is on.
9. detection method according to claim 8, which is characterized in that true according to first electric current and second electric current
The step of operating status of the fixed electric heater, includes：
It is zero and in the case that the current value of second electron current is not zero in the current value of first electron current, determines
The heating wire is broken with the zero line side of the heating wire and is turned on the casing；
In the case that current value in first electron current is not zero and the current value of second electron current is zero, determine
The heating wire is broken with the zero line of the heating wire and is turned on the casing.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410030107.0A CN104793094B (en) | 2014-01-22 | 2014-01-22 | Detection circuit and method for electric heater and electric heating system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410030107.0A CN104793094B (en) | 2014-01-22 | 2014-01-22 | Detection circuit and method for electric heater and electric heating system |
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| CN104793094A CN104793094A (en) | 2015-07-22 |
| CN104793094B true CN104793094B (en) | 2018-05-18 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109426282A (en) * | 2017-08-28 | 2019-03-05 | 美的集团股份有限公司 | Control system, method and heating equipment |
| CN110646684B (en) * | 2018-06-27 | 2022-06-14 | 北京北方华创微电子装备有限公司 | Heater fault detection device and method, heating system and semiconductor processing equipment |
| CN113483407B (en) * | 2021-05-26 | 2022-09-16 | 海信空调有限公司 | Control method, device and system of PTC electric heater and air conditioner |
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| US7209651B1 (en) * | 2005-12-07 | 2007-04-24 | Aos Holding Company | Fluid-heating apparatus, circuit for heating a fluid, and method of operating the same |
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| CN202305689U (en) * | 2011-09-30 | 2012-07-04 | 海信（北京）电器有限公司 | Multiway heating wire detection circuit and refrigerator provided with same |
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| CN104793094A (en) | 2015-07-22 |
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