CN107919655A - Control circuit, control method and air-conditioning - Google Patents
Control circuit, control method and air-conditioning Download PDFInfo
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- CN107919655A CN107919655A CN201711326209.7A CN201711326209A CN107919655A CN 107919655 A CN107919655 A CN 107919655A CN 201711326209 A CN201711326209 A CN 201711326209A CN 107919655 A CN107919655 A CN 107919655A
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- control
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
- H02H7/222—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices for switches
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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
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
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- General Physics & Mathematics (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
- Protection Of Static Devices (AREA)
Abstract
The invention discloses a kind of control circuit, control method and air-conditioning, is related to electrical equipment technical field.Control circuit includes：First relay group, is arranged on the power grid firewire for the rectification module for accessing electrical equipment, and the first relay group includes the first relay and the second relay being connected in series；First controller, for controlling the state of the first relay；Second controller, for controlling the state of the second relay, the state includes being attracted or disconnects；Wherein, one in the first relay and the second relay is disconnected by control, in the case that another is attracted by control, in the case that the first ac bus voltage that first controller is used between the first relay group and rectification module is more than first threshold, determine that contact occur by the relay that control disconnects is adhered exception.
Description
Technical field
The present invention relates to electrical equipment technical field, especially a kind of control circuit, control method and air-conditioning.
Background technology
At present, the control circuit between power grid and the rectification module of electrical equipment 101 includes being arranged on access rectification module
One controller 103 of a relay 102 on 101 firewire L and the state for controlling relay 102.Above-mentioned control
Circuit structure processed is simple, and function is single, but there are security risk.For example, when electric network source occurs abnormal, it is necessary to disconnect power grid
Electrical connection between rectification module 101.
However, it is found by the inventors that if contact, which occurs, in relay 102 is adhered exception, can lead to not to cut off power grid and
Electrical connection between rectification module 101, causes sparking, electric shock problem.
The content of the invention
A technical problem to be solved by this invention is：Since contact occurs in relay, to be adhered abnormal caused safety hidden
Suffer from problem.
One side according to embodiments of the present invention, there is provided a kind of control circuit, including：First relay group, is arranged on and connects
Enter on the power grid firewire of the rectification module of electrical equipment, the first relay group includes the first relay for being connected in series and the
Two relays；First controller, for controlling the state of the first relay；Second controller, for controlling the second relay
State, the state include being attracted or disconnect；Wherein, one in the first relay and the second relay by control disconnect,
In the case that another is attracted by control, the first controller is used for first between the first relay group and rectification module
In the case that ac bus voltage is more than first threshold, determine that contact occur by the relay that control disconnects is adhered exception.
In one embodiment, in the case where the first relay is disconnected by control, the second relay is attracted by control, the
One controller is additionally operable to occur in the case that contact is adhered exception in definite first relay, instruction second controller control second
Relay disconnects.
In one embodiment, occur in definite first relay in the case that contact is adhered exception, second controller is also
In the case of instruction for not receiving the first controller in preset time, the second relay of active control disconnects.
In one embodiment, in the case where the first relay is attracted by control, the second relay is disconnected by control, the
One controller is additionally operable to occur in the case that contact is adhered exception in definite second relay, and the first relay of control disconnects.
In one embodiment, in the case where the first relay and the second relay are attracted by control, the first controller
It is additionally operable to the second ac bus voltage between the first relay group and power grid and is less than second threshold or more than the 3rd threshold
In the case of value, the first relay of control disconnects and indicates that second controller controls the second relay to disconnect；Wherein described second
Threshold value is less than the 3rd threshold value.
In one embodiment, the control circuit further includes：It is connected across the branch at the first relay group both ends, institute
State the 5th relay and resistance for being provided with and being connected in series on branch；First controller be additionally operable to the first relay and second after
In the case that electric appliance disconnects, the 5th relay of control is attracted, to charge to dc-link capacitance；First controller is also used
In the case of the 4th threshold value is more than in DC bus-bar voltage, the first relay of control is attracted, and indicates second controller control
Second relay is attracted；After the actuation of the second relay, the 5th relay of control disconnects.
Another aspect according to embodiments of the present invention, there is provided a kind of control circuit, including：First relay group, is arranged on
Access on the power grid firewire of the rectification module of electrical equipment, the first relay group include the first relay for being connected in series and
Second relay；Second relay group, is arranged in the grid zero line of the rectification module, and the second relay group includes string
Join the 3rd relay and the 4th relay of connection；First controller, for controlling the shape of the first relay and the 3rd relay
State；And second controller, for controlling the state of the second relay and the 4th relay, the state includes being attracted or breaks
Open；Wherein, one in the first relay, the second relay, the 3rd relay, the 4th relay by control disconnect, other
In the case of being attracted by control, the first controller exchanges mother for first between the first relay group and rectification module
In the case that line voltage is more than first threshold, determine that contact occur by the relay that control disconnects is adhered exception.
In one embodiment, one in the first relay and the second relay is disconnected by control, another is controlled
In the case that system is attracted, the first controller is additionally operable to determining that contact occur by the relay that control disconnects is adhered abnormal situation
Under, control the relay being attracted in the first relay and the second relay by control to disconnect, and indicate second controller control the
Three relays and the 4th relay disconnect.
In one embodiment, in the case where determining that being occurred contact by the relay that control disconnects is adhered exception, second
In the case that controller is additionally operable to not receive the instruction of the first controller in preset time, the 3rd relay of active control and
4th relay disconnects.
In one embodiment, one in the 3rd relay and the 4th relay is disconnected by control, another is controlled
In the case that system is attracted, the first controller is additionally operable to determining that contact occur by the relay that control disconnects is adhered abnormal situation
Under, control the first relay and the second relay to disconnect, and indicate that second controller controls the 3rd relay and the 4th relay
The middle relay being attracted by control disconnects.
In one embodiment, inhaled in the first relay, the second relay, the 3rd relay and the 4th relay by control
In the case of conjunction, the second ac bus voltage that the first controller is additionally operable between the first relay group and power grid is less than
Second threshold or more than the 3rd threshold value in the case of, control the first relay and the second relay to disconnect, and indicate the second control
Device controls the 3rd relay and the 4th relay to disconnect；Wherein described second threshold is less than the 3rd threshold value.
In one embodiment, the control circuit further includes：It is connected across the branch at the first relay group both ends, institute
State the 5th relay and resistance for being provided with and being connected in series on branch；First controller is additionally operable to the feelings disconnected in whole relays
Under condition, the 3rd relay of control is attracted, and indicates that second controller controls the 4th relay to be attracted；It is attracted in the 4th relay
Afterwards, the 5th relay is controlled to be attracted, to charge to dc-link capacitance；First controller is additionally operable in dc bus electricity
In the case that pressure is more than the 4th threshold value, the first relay of control is attracted, and indicates that second controller controls the second relay to be attracted；
After the actuation of the second relay, the 5th relay of control disconnects.
Another aspect according to embodiments of the present invention, there is provided a kind of air-conditioning, including：Described in any one above-mentioned embodiment
Control circuit.
A kind of another further aspect according to embodiments of the present invention, there is provided control electricity based on described in any one above-mentioned embodiment
The control method on road, including：One in the first relay and the second relay is controlled to disconnect, another actuation；First after
In the case that the first ac bus voltage between electric appliance group and rectification module is more than first threshold, determine by control disconnect after
There is contact and is adhered exception in electric appliance.
In one embodiment, one in the first relay of the control and the second relay disconnects, another is attracted
Including：The first relay is controlled to disconnect, the second relay is attracted；The method further includes：Touched in definite first relay
In the case that point is adhered exception, the first controller instruction second controller controls the second relay to disconnect.
In one embodiment, the method further includes：There is contact in definite first relay and be adhered abnormal situation
Under, in the case that second controller does not receive the instruction of the first controller in preset time, the second relay of active control
Disconnect.
In one embodiment, one in the first relay of the control and the second relay disconnects, another is attracted
Including：The first relay is controlled to be attracted, the second relay disconnects；The method further includes：Touched in definite second relay
In the case that point is adhered exception, the first controller controls the first relay to disconnect.
In one embodiment, the method further includes：The first relay and the second relay is controlled to be attracted；Described
The second ac bus voltage between one relay group and power grid be less than second threshold or more than the 3rd threshold value in the case of, first
Controller controls the first relay to disconnect, and indicates that second controller controls the second relay to disconnect；Wherein described second threshold
Less than the 3rd threshold value.
In one embodiment, the method further includes：First controller is disconnected in the first relay and the second relay
In the case of, the 5th relay of control is attracted, to charge to dc-link capacitance；First controller is in dc bus electricity
In the case that pressure is more than the 4th threshold value, the first relay of control is attracted, and indicates that second controller controls the second relay to be attracted；
After the actuation of the second relay, the 5th relay of control disconnects first controller.
A kind of further aspect according to embodiments of the present invention, there is provided control electricity based on described in any one above-mentioned embodiment
The control method on road, including：One in the first relay, the second relay, the 3rd relay, the 4th relay is controlled to break
Open, other actuations；The first ac bus voltage between the first relay group and rectification module is more than first threshold
In the case of, determine that contact occur by the relay that control disconnects is adhered exception.
In one embodiment, in the first relay of the control, the second relay, the 3rd relay, the 4th relay
One disconnect, other actuations include：One in the first relay and the second relay is controlled to disconnect, another actuation, and
And the 3rd relay of control and the 4th relay are attracted；The method further includes：Occur in the relay for determining to be disconnected by control
In the case that contact is adhered exception, the first controller controls the relay being attracted in the first relay and the second relay by control
Disconnect, and indicate that second controller controls the 3rd relay and the 4th relay to disconnect.
In one embodiment, the method further includes：Determine by control disconnect relay occur contact be adhered it is different
In the case of often, in the case that second controller does not receive the instruction of the first controller in preset time, active control the
Three relays and the 4th relay disconnect.
In one embodiment, in the first relay of the control, the second relay, the 3rd relay, the 4th relay
One disconnect, other actuations include：Control the first relay and the second relay to be attracted, and control the 3rd relay and the
A disconnection, another actuation in four relays；The method further includes：Determining to be touched by the relay that control disconnects
In the case that point is adhered exception, the first controller controls the first relay and the second relay to disconnect, and indicates second controller
The relay being attracted in the 3rd relay and the 4th relay by control is controlled to disconnect.
In one embodiment, the method further includes：Control the first relay, the second relay, the 3rd relay and
4th relay is attracted；The second ac bus voltage between the first relay group and power grid is less than second threshold or big
In the case of the 3rd threshold value, the first controller controls the first relay and the second relay to disconnect, and indicates second controller
The 3rd relay and the 4th relay is controlled to disconnect；Wherein described second threshold is less than the 3rd threshold value.
In one embodiment, the method further includes：First controller is in the case where whole relays disconnect, control
3rd relay is attracted, and indicates that second controller controls the 4th relay to be attracted；After the actuation of the 4th relay, control the 5th
Relay is attracted, to charge to dc-link capacitance；First controller is more than the 4th threshold value in DC bus-bar voltage
In the case of, the first relay of control is attracted, and indicates that second controller controls the second relay to be attracted；It is attracted in the second relay
Afterwards, the 5th relay is controlled to disconnect.
In control circuit provided in an embodiment of the present invention, two relays being connected in series are provided with power grid firewire,
And two controllers are provided with, two controllers each control the state of a relay.In this way, break in a relay
Open, in the case of the actuation of another relay, if the first ac bus voltage is more than first threshold, can determine to be controlled
There is contact and is adhered exception in the relay of disconnection.Determine that relay contact occurs and be adhered abnormal to be conducive to lift electrical equipment operation
Security.
Below by drawings and examples, technical scheme is described in further detail.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the structure diagram of existing control circuit；
Fig. 2 is the structure diagram of control circuit according to an embodiment of the invention；
Fig. 3 is the structure diagram of control circuit in accordance with another embodiment of the present invention；
Fig. 4 is the structure diagram of the control circuit of another embodiment according to the present invention；
Fig. 5 is the structure diagram of the control circuit of further embodiment according to the present invention；
Fig. 6 is the flow diagram of control method according to an embodiment of the invention；
Fig. 7 is the flow diagram of control method in accordance with another embodiment of the present invention.
Embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art obtained on the premise of creative work is not made it is all its
His embodiment, belongs to the scope of protection of the invention.
Unless specifically stated otherwise, the component and positioned opposite, the digital table of step otherwise illustrated in these embodiments
Do not limited the scope of the invention up to formula and numerical value.
At the same time, it should be appreciated that for the ease of description, the size of the various pieces shown in attached drawing is not according to reality
Proportionate relationship draw.
It may be not discussed in detail for technology, method and apparatus known to person of ordinary skill in the relevant, but suitable
In the case of, the technology, method and apparatus should be considered as authorizing part for specification.
In shown here and discussion all examples, any occurrence should be construed as merely exemplary, without
It is as limitation.Therefore, the other examples of exemplary embodiment can have different values.
It should be noted that：Similar label and letter represents similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined, then it need not be further discussed in subsequent attached drawing in a attached drawing.
Fig. 2 is the structure diagram of control circuit according to an embodiment of the invention.The control circuit can be arranged on
Between power grid and the rectification module of electrical equipment 204.Electrical equipment for example can be air-conditioning, and air-conditioning can include but is not limited to light
Lie prostrate air-conditioning.However, the present invention is not limited thereto, electrical equipment can also be other electrical equipments etc..Here, rectification module 204
The alternating current of power grid can be converted to direct current；Alternatively, in the case where electrical equipment is PV air-conditioner, rectification module 204
It is grid-connected direct current can also to be converted to alternating current.As an example, rectification module 204 can use intelligent power module
(IPM) realize.
As shown in Fig. 2, control circuit includes the first relay group 201, the first controller 202 and second controller 203.
First relay group 201 is arranged on the power grid firewire L of the rectification module 204 of access electrical equipment.For example, first
Relay group 201 can be connected with the intelligent power module (IPM) of electrical equipment 204.First relay group 201 can at least wrap
Include the first relay 211 and the second relay 221 being connected in series.It is to be understood that the first relay group 201 can also include and the
One relay 211 and more relays of the second relay 221 series connection.
First controller 202 is used for the state for controlling the first relay 211, that is, is attracted or disconnects.Second controller 203 is used
In the state for controlling the second relay 221.For example, the first controller 202 and the first relay 211 can be commonly connected to power grid
Node 205 on firewire L, 203 and second relay 221 of second controller can be commonly connected to the node on power grid firewire L
206。
Exemplarily, the first controller 202 and second controller 203 can include digital signal processor (DSP), the two
Information exchange can be carried out by I/O interface (such as interface X1, interface X2, interface X3 or interface X4).
One in the first relay 211 and the second relay 221 is controlled disconnection, another feelings being attracted by control
Under condition, the first controller 202 is used for the first ac bus voltage V1 between the first relay group 201 and rectification module 204
In the case that (potential difference i.e. between node 206 and zero curve N) is more than first threshold, the relay for determining to be disconnected by control occurs
Contact is adhered exception.Here, V1 can be gathered only by the first controller 202, can also be at the same time by the first controller 202 and first
Controller 203 gathers.In addition, first threshold can be pre-set empirical value, such as it can be electric network source rated voltage
Half.
In the control circuit of above-described embodiment, two relays being connected in series are provided with power grid firewire, and set
Two controllers are put, two controllers each control the state of a relay.In this way, disconnect in relay, is another
In the case that a relay is attracted, if the first ac bus voltage is more than first threshold, it can determine to be controlled disconnection
There is contact and is adhered exception in relay.Determine that relay contact occurs and is adhered the abnormal safety for being conducive to lift electrical equipment operation
Property.
In practical applications, it can detect whether each relay touches according to predetermined period when electrical equipment is not run
Point is adhered exception.For example, the first controller 202 can control the first relay 211 to disconnect, and indicate 203 control of the second control
Second relay is attracted, and can so detect the first relay 211 and contact whether occurs and is adhered exception；In another example the first control
Device 202 can control the first relay 211 to be attracted, and indicate that 203 the second relay 221 of control of the second control disconnects, and so may be used
Exception is adhered so that whether the second relay 221 of detection contact occurs.
Occur that after contact is adhered exception, follow-up behaviour can be carried out in definite first relay 211 or the second relay 221
Make.For example, it can alarm to remind related personnel to cut off the electrical connection between power grid and rectification module 204；Alternatively, it can lead
Electrical connection between dynamic cut-out power grid and rectification module 204.Here, electrically connecting between power grid and rectification module 204 is cut off
Connect namely cut off the electrical connection between power grid and electrical equipment.
In one implementation, the first relay 211 is disconnected by control, the second relay 221 is attracted by control.True
Fixed first relay 211 occurs in the case that contact is adhered exception, and the first controller 202 can serve to indicate that second controller
203 the second relays 221 of control disconnect, and to cut off the electrical connection between power grid and rectification module 204, form isolated island, carry
Security during electrical equipment operation is risen.
In some cases, the first controller 202 is possible to not indicate that second controller 203 controls the second relay 221
Disconnect.In one embodiment, in order to ensure the electrical connection between cut-out power grid and rectification module 204 in time, further carry
The security of electrical equipment operation is risen, is occurred in definite first relay 211 in the case that contact is adhered exception, second controller
In the case that 203 can be also used for not receiving the instruction of the first controller in preset time, the second relay of active control
221 disconnect, further to lift the security of electrical equipment operation.
In another implementation, the first relay 211 is attracted by control, the second relay 221 is disconnected by control.This
In the case of kind, the first controller 202 can be used for occurring in the case that contact is adhered exception, controlling in definite second relay 221
Make the first relay 211 to disconnect, to cut off the electrical connection between power grid and rectification module 204.
When electrical equipment works, if it is abnormal to detect that electric network source voltage occurs, power grid and electricity consumption can also be cut off
Electrical connection between equipment, further to lift the security of electrical equipment operation.In one embodiment, in the first relay
In the case that 211 and second relay 221 of device is attracted by control, the first controller 202 can be also used in the first relay group
The second ac bus voltage V2 (potential difference i.e. between node 205 and zero curve) between 201 and power grid be less than second threshold or
In the case of the 3rd threshold value, the first relay 211 of control disconnects and indicates that second controller 203 controls the second relay
221 disconnect.Here, second threshold is less than the 3rd threshold value, the two can be set according to actual conditions.
Fig. 3 is the structure diagram of control circuit in accordance with another embodiment of the present invention.
Compared with embodiment illustrated in fig. 2, the control circuit of embodiment illustrated in fig. 3, which further includes, is connected across the first relay group
The branch at 201 both ends, is provided with the 5th relay 251 and resistance R being connected in series on the branch.
The control circuit of the embodiment can be used for the soft start charge control to charge to dc-link capacitance, to subtract
The small overcurrent to dc-link capacitance is impacted, and is introduced in detail below.
First controller 202 can be in the case where the first relay 211 and the second relay 221 disconnect, control the 5th
Relay 251 is attracted, to charge to dc-link capacitance.After default a period of time (such as after 2s), the first control
Device 202 can control the first relay in the case where DC bus-bar voltage is more than the 4th threshold value (such as can be 215V etc.)
211 are attracted, and indicate that second controller 203 controls the second relay 221 to be attracted；After the actuation of the second relay 221, control the
Five relays 251 disconnect, so as to complete normal soft start charge control.
Alternatively, after the actuation of the second relay 221, can be delayed a period of time, such as control the 5th relay after 2s again
Device 251 disconnects.
In addition, if continuous preset times detect that DC bus-bar voltage is not more than the 4th threshold value, then show to charge back
Road may be faulty, and the first controller 202 can control the first relay 211 to disconnect, and indicates the control of second controller 203 the
Two relays 221 disconnect.
It is to be understood that although dc-link capacitance is not showed that in Fig. 3, it will be appreciated, however, by one skilled in the art that rectification module
204 can flow to dc-link capacitance after the alternating current of power grid is converted to direct current.Therefore excessive Jie is done herein to this content
Continue.
Fig. 4 is the structure diagram of the control circuit of another embodiment according to the present invention.Only introduce below Fig. 4 with
The difference of embodiment illustrated in fig. 2, other same part are referred to above description.
Compared with embodiment illustrated in fig. 2, embodiment illustrated in fig. 4 further includes the rectification module for being arranged on access electrical equipment
The second relay group 401 on 204 grid zero line N.
Second relay group 401 can include at least the 3rd relay 231 and the 4th relay 241 being connected in series.Should
Understand, the second relay group 401 can also include the more relays connected with the 3rd relay 231 and the 4th relay 241
Device.
In the embodiment, the first controller 202 is used for the state for controlling the first relay 211 and the 3rd relay 231.The
Two controllers 203 are used for the state for controlling the 3rd relay 231 and the 4th relay 241.
One in the first relay 211, the second relay 221, the 3rd relay 231, the 4th relay 241 is controlled
In the case that system disconnects, other are attracted by control, the first controller 202 is used in the first relay group 201 and rectification module 204
Between the first ac bus voltage V1 be more than first threshold in the case of, determine occurred contact by the relay that control disconnects and sticked
It is even abnormal.
Table 1, which is shown, is detecting whether each relay the first controller 202 and the second control when contact is adhered exception occurs
The signal schematic representation interacted between 203.
Table 1
Illustrated below exemplified by detecting the first relay 211 and whether being adhered, other relays are similar.
First controller 202 controls the first relay 211 to disconnect, and the 3rd relay 231 of control is attracted.For example, the first control
Device 202 processed can send the signal 0 for the state for representing the first relay 211 by interface X1, sent by interface X2 and represent the
The signal 1 of the state of three relays 231.
Second controller 203 controls the second relay 221 and the 4th relay 241 after signal 0 and signal 1 is received
It is attracted.Through after a while after (such as 20ms) by interface X3 to the first controller 202 send signal 0, by interface X4 to
First controller 202 sends signal 1, to notify second controller 203 to control the second relay 221 and the 4th relay
241 complete to be attracted.
In the control circuit of above-described embodiment, two relays being connected in series are provided with power grid firewire, in power grid
Two relays being connected in series are also provided with zero curve.The embodiment can detect whether any one relay touches
Point is adhered exception.
In one implementation, one in the first relay 211 and the second relay 221 is disconnected by control, is another
In the case that one is attracted by control, the first controller 202 is additionally operable to determining that contact occur by the relay that control disconnects sticks
Even in the case of exception, the relay being attracted in the first relay 211 and the second relay 221 by control is controlled to disconnect, and refer to
Show that second controller 203 controls the 3rd relay 231 and the 4th relay 241 to disconnect, with cut off power grid and rectification module 204 it
Between electrical connection, lifting electrical equipment operation security.Alternatively, determining that contact is occurred by the relay that control disconnects
In the case of being adhered exception, second controller 203 is additionally operable to not receive the instruction of the first controller 202 in preset time
In the case of, the 3rd relay 231 of active control and the 4th relay 241 disconnect, further to lift the peace of electrical equipment operation
Quan Xing.
In another implementation, one in the 3rd relay 231 and the 4th relay 241 disconnected by control,
In the case that another is attracted by control, the first controller 202 is additionally operable to determining contact occur by the relay that control disconnects
In the case of being adhered exception, the first relay 211 and the second relay 221 is controlled to disconnect, and indicate that second controller 203 controls
The relay being attracted in 3rd relay 231 and the 4th relay 241 by control disconnects, to cut off power grid and rectification module 204
Between electrical connection, lifting electrical equipment operation security.
In one embodiment, in the first relay 211, the second relay 221, the 3rd relay 231 and the 4th relay
In the case that device 241 is attracted by control, the first control 202 is additionally operable to the second friendship between the first relay group 201 and power grid
In the case of flowing busbar voltage V2 less than second threshold or more than the 3rd threshold value, the first relay 211 and the second relay are controlled
221 disconnect, and indicate that second controller 203 controls the 3rd relay 231 and the 4th relay 241 to disconnect；Wherein second threshold
Less than the 3rd threshold value.
Fig. 5 is the structure diagram of the control circuit of further embodiment according to the present invention.Only introduce below Fig. 5 with
The difference of embodiment illustrated in fig. 4, other same part are referred to above description.
Compared with embodiment illustrated in fig. 4, embodiment illustrated in fig. 5 further includes the branch for being connected across 201 both ends of the first relay group
Road, is provided with the 5th relay 251 and resistance R being connected in series on branch.
First controller 202 is additionally operable in the case where whole relays disconnect, and the 3rd relay 231 of control is attracted, and
Instruction second controller 203 controls the 4th relay 241 to be attracted；After the actuation of the 4th relay 241, the 5th relay is controlled
251 are attracted, so that pair dc-link capacitance being connected with rectification module 204 charges.
First controller 202 is additionally operable to, in the case where DC bus-bar voltage is more than the 4th threshold value, control the first relay
211 are attracted, and indicate that second controller 203 controls the second relay 221 to be attracted；After the actuation of the second relay 221, control the
Five relays 251 disconnect.
Similarly, if continuous preset times detect that DC bus-bar voltage is not more than the 4th threshold value, show to charge
Circuit may be faulty, and the first controller 202 can control the first relay 211 and the 3rd relay 231 to disconnect, and indicates the
Two controllers 203 control the second relay 221 and the 4th relay 241 to disconnect.
Present invention also offers a kind of air-conditioning, including：The control circuit of any one above-mentioned embodiment.In one embodiment
In, air-conditioning can include but is not limited to PV air-conditioner, such as photovoltaic convertible frequency air-conditioner.
Detecting that grid-connected failure occurs in PV air-conditioner, such as the leakage current between photovoltaic panel and the earth exceedes preset value
Deng, control circuit avoided by controlling each relay to disconnect it is grid-connected caused by safety problem.
Present invention also offers a kind of control method of the control circuit based on above-described embodiment.
Fig. 6 is the flow diagram of control method according to an embodiment of the invention.
In step 602, one in the first relay and the second relay is controlled to disconnect, another actuation.
For example, the first relay of control disconnects, the second relay is attracted；In another example the disconnection of the first relay of control, second
Relay is attracted.
In step 604, the first ac bus voltage between the first relay group and rectification module is more than first threshold
In the case of, determine that contact occur by the relay that control disconnects is adhered exception.
Occur in definite first relay in the case that contact is adhered exception, the first controller can indicate second controller
The second relay is controlled to disconnect.In addition, occurring in definite second relay in the case that contact is adhered exception, the first controller can
To control the first relay to disconnect.
Alternatively, occur in definite first relay in the case that contact is adhered exception, second controller is in preset time
In the case of the instruction for not receiving the first controller inside, the second relay of active control disconnects.
In above-described embodiment, in the case where a relay disconnects, another relay is attracted, if the first exchange is female
Line voltage is more than first threshold, then can determine that being controlled the relay of disconnection contact occur is adhered exception.
In one embodiment, in order to further lift the security of electrical equipment operation, method shown in Fig. 6 can also wrap
Include：The first relay and the second relay is controlled to be attracted；The second ac bus voltage between the first relay group and power grid
In the case of less than second threshold or more than the 3rd threshold value, the first controller controls the first relay to disconnect, and indicates the second control
Device processed controls the second relay to disconnect；Wherein second threshold is less than the 3rd threshold value.
, can in the case where the second ac bus voltage is less than second threshold or more than the 3rd threshold value in above-described embodiment
To judge that it is abnormal that electric network source occurs, by controlling the first relay and the disconnection of the second relay to cut off power grid and be set with electricity consumption
Electrical connection between standby.
In one embodiment, method shown in Fig. 6 can also include：First controller is in the first relay and the second relay
In the case that device disconnects, the 5th relay of control is attracted, to charge to dc-link capacitance；First controller is in direct current
In the case that busbar voltage is more than the 4th threshold value, the first relay of control is attracted, and indicates that second controller controls the second relay
Device is attracted；After the actuation of the second relay, the 5th relay of control disconnects first controller.The embodiment is controlled by soft start
To avoid to dc-link capacitance overcurrent can be caused to impact.
Fig. 7 is the flow diagram of control method in accordance with another embodiment of the present invention.
One in step 702, the first relay of control, the second relay, the 3rd relay, the 4th relay is disconnected
Open, other actuations.
For example, control the first relay and the second relay in one disconnect, another actuation, and control the 3rd after
Electric appliance and the 4th relay are attracted；In another example the first relay of control and the second relay are attracted, and control the 3rd relay
Disconnected with one in the 4th relay, another actuation.
In step 704, the first ac bus voltage between the first relay group and rectification module is more than first threshold
In the case of, determine that contact occur by the relay that control disconnects is adhered exception.
For example, control the first relay and the second relay in one disconnect, another actuation, and control the 3rd after
Electric appliance and the 4th relay are attracted.In the case where determining that being occurred contact by the relay that control disconnects is adhered exception, the first control
Device processed controls the relay being attracted in the first relay and the second relay by control to disconnect, and indicates second controller control the
Three relays and the 4th relay disconnect.Alternatively, determining that contact occur by the relay that control disconnects is adhered abnormal feelings
Under condition, in the case that second controller does not receive the instruction of the first controller in preset time, the 3rd relay of active control
Device and the 4th relay disconnect.
In another example the first relay of control and the second relay are attracted, and control the 3rd relay and the 4th relay
In one disconnect, another actuation.In the case where determining that being occurred contact by the relay that control disconnects is adhered exception, first
Controller controls the first relay and the second relay to disconnect, and indicates that second controller controls the 3rd relay and the 4th relay
The relay being attracted in device by control disconnects.
In one embodiment, in order to further lift the security of electrical equipment operation, method shown in Fig. 7 can also wrap
Include：The first relay, the second relay, the 3rd relay and the 4th relay is controlled to be attracted；In the first relay group and power grid
Between the second ac bus voltage be less than second threshold or more than the 3rd threshold value in the case of, the first controller control first after
Electric appliance and the second relay disconnect, and indicate that second controller controls the 3rd relay and the 4th relay to disconnect；Wherein second
Threshold value is less than the 3rd threshold value.
In one embodiment, method shown in Fig. 7 can also include：The situation that first controller is disconnected in whole relays
Under, the 3rd relay of control is attracted, and indicates that second controller controls the 4th relay to be attracted；After the actuation of the 4th relay,
The 5th relay is controlled to be attracted, to charge to dc-link capacitance；First controller is more than the in DC bus-bar voltage
In the case of four threshold values, the first relay of control is attracted, and indicates that second controller controls the second relay to be attracted；Second after
After electric appliance is attracted, the 5th relay of control disconnects.The embodiment can be made by soft start control to avoid to dc-link capacitance
Impacted into overcurrent.
Each embodiment is described by the way of progressive in this specification, what each embodiment stressed be and its
The difference of its embodiment, the same or similar part cross-reference between each embodiment.It is real for control method
For applying example, since it is substantially corresponding with control circuit embodiment, so description is fairly simple, related part is real referring to method
Apply the part explanation of example.
So far, various embodiments of the present invention are described in detail.In order to avoid the design of the masking present invention, this is not described
Some details well known to field.Those skilled in the art as described above, can be appreciated how to implement completely public here
The technical solution opened.
The method and circuit of the present invention may be achieved in many ways.For example, can by software, hardware, firmware or
Person's software, hardware, firmware any combinations come realize the present invention method and device.The step of for the method it is above-mentioned
Order is merely to illustrate, and the step of method of the invention is not limited to order described in detail above, unless with other sides
Formula illustrates.In addition, in certain embodiments, the present invention can be also embodied as recording program in the recording medium, these
Program includes the machine readable instructions for being used for realization the method according to the invention.Thus, the present invention also covering storage is used to perform
The recording medium of the program of the method according to the invention.
Although some specific embodiments of the present invention are described in detail by example, the skill of this area
Art personnel it should be understood that above example merely to illustrating, the scope being not intended to be limiting of the invention.The skill of this area
Art personnel are it should be understood that without departing from the scope and spirit of the present invention can modify above example.This hair
Bright scope is defined by the following claims.
Claims (25)
- A kind of 1. control circuit, it is characterised in that including：First relay group, is arranged on the power grid firewire for the rectification module for accessing electrical equipment, the first relay group bag Include the first relay and the second relay being connected in series；First controller, for controlling the state of the first relay；Second controller, for controlling the state of the second relay, the state includes being attracted or disconnects；Wherein, in the case that one in the first relay and the second relay is disconnected by control, another is attracted by control, The first ac bus voltage that first controller is used between the first relay group and the rectification module is more than first In the case of threshold value, determine that contact occur by the relay that control disconnects is adhered exception.
- 2. control circuit according to claim 1, it is characterised in thatIn the case where the first relay is disconnected by control, the second relay is attracted by control, the first controller is additionally operable to true Fixed first relay occurs in the case that contact is adhered exception, and instruction second controller controls the second relay to disconnect.
- 3. control circuit according to claim 2, it is characterised in thatOccur in definite first relay in the case that contact is adhered exception, second controller is additionally operable to not have in preset time In the case of the instruction for receiving the first controller, the second relay of active control disconnects.
- 4. control circuit according to claim 1, it is characterised in thatIn the case where the first relay is attracted by control, the second relay is disconnected by control, the first controller is additionally operable to true Fixed second relay occurs in the case that contact is adhered exception, and the first relay of control disconnects.
- 5. according to the control circuit described in claim 1-4 any one, it is characterised in thatIn the case where the first relay and the second relay are attracted by control, the first controller is additionally operable in first relay The second ac bus voltage between device group and power grid be less than second threshold or more than the 3rd threshold value in the case of, control first after Electric appliance disconnects and indicates that second controller controls the second relay to disconnect；Wherein described second threshold is less than the 3rd threshold value.
- 6. control circuit according to claim 1, it is characterised in that further include：The branch at the first relay group both ends is connected across, the 5th relay and electricity being connected in series are provided with the branch Resistance；First controller is additionally operable in the case where the first relay and the second relay disconnect, and the 5th relay of control is attracted, To charge to dc-link capacitance；First controller is additionally operable in the case where DC bus-bar voltage is more than the 4th threshold value, and the first relay of control is attracted, and Indicate that second controller controls the second relay to be attracted；After the actuation of the second relay, the 5th relay of control disconnects.
- A kind of 7. control circuit, it is characterised in that including：First relay group, is arranged on the power grid firewire for the rectification module for accessing electrical equipment, the first relay group bag Include the first relay and the second relay being connected in series；Second relay group, is arranged on and accesses in the grid zero line of the rectification module, and the second relay group includes series connection The 3rd relay and the 4th relay of connection；First controller, for controlling the state of the first relay and the 3rd relay；AndSecond controller, for controlling the state of the second relay and the 4th relay, the state includes being attracted or disconnects；Wherein, one in the first relay, the second relay, the 3rd relay, the 4th relay by control disconnect, other In the case of being attracted by control, the first controller is used for the first friendship between the first relay group and the rectification module Busbar voltage is flowed more than in the case of first threshold, and the definite relay disconnected by control contact occurs and is adhered exception.
- 8. control circuit according to claim 7, it is characterised in thatOne in the first relay and the second relay is disconnected by control, in the case that another is attracted by control, and first Controller is additionally operable to determining to be occurred by the relay that control disconnects in the case that contact is adhered exception, the first relay of control and The relay being attracted in second relay by control disconnects, and indicates that second controller controls the 3rd relay and the 4th relay Disconnect.
- 9. control circuit according to claim 8, it is characterised in thatDetermining to be occurred by the relay that control disconnects in the case that contact is adhered exception, second controller is additionally operable to when default In the case of the interior instruction for not receiving the first controller, the 3rd relay of active control and the 4th relay disconnect.
- 10. control circuit according to claim 7, it is characterised in thatOne in the 3rd relay and the 4th relay is disconnected by control, in the case that another is attracted by control, and first Controller is additionally operable to determining to be occurred by the relay that control disconnects in the case that contact is adhered exception, the first relay of control and Second relay disconnects, and indicates that second controller controls the relay being attracted in the 3rd relay and the 4th relay by control Disconnect.
- 11. according to the control circuit described in claim 7-10 any one, it is characterised in thatIn the case where the first relay, the second relay, the 3rd relay and the 4th relay are attracted by control, the first control The second ac bus voltage that device is additionally operable between the first relay group and power grid is less than second threshold or more than the 3 In the case of threshold value, control the first relay and the second relay to disconnect, and indicate second controller control the 3rd relay and 4th relay disconnects；Wherein described second threshold is less than the 3rd threshold value.
- 12. control circuit according to claim 7, it is characterised in that further include：The branch at the first relay group both ends is connected across, the 5th relay and electricity being connected in series are provided with the branch Resistance；First controller is additionally operable in the case where whole relays disconnect, and the 3rd relay of control is attracted, and indicates the second control Device processed controls the 4th relay to be attracted；After the actuation of the 4th relay, the 5th relay of control is attracted, so as to dc bus electricity Appearance charges；First controller is additionally operable in the case where DC bus-bar voltage is more than the 4th threshold value, and the first relay of control is attracted, and Indicate that second controller controls the second relay to be attracted；After the actuation of the second relay, the 5th relay of control disconnects.
- A kind of 13. air-conditioning, it is characterised in that including：Control circuit described in claim 1-12 any one.
- A kind of 14. control method of the control circuit based on described in claim 1-6 any one, it is characterised in that including：One in the first relay and the second relay is controlled to disconnect, another actuation；In the case that the first ac bus voltage between the first relay group and rectification module is more than first threshold, quilt is determined There is contact and is adhered exception in the relay that control disconnects.
- 15. control method according to claim 14, it is characterised in that the first relay of the control and the second relay In one disconnect, another actuation includes：The first relay is controlled to disconnect, the second relay is attracted；The method further includes：Occur in definite first relay in the case that contact is adhered exception, the first controller instruction second controller control second Relay disconnects.
- 16. control method according to claim 15, it is characterised in that further include：Occur in definite first relay in the case that contact is adhered exception, second controller does not receive in preset time In the case of the instruction of one controller, the second relay of active control disconnects.
- 17. control method according to claim 14, it is characterised in that the first relay of the control and the second relay In one disconnect, another actuation includes：The first relay is controlled to be attracted, the second relay disconnects；Occur in definite second relay in the case that contact is adhered exception, the first controller controls the first relay to disconnect.
- 18. according to the control method described in claim 14-17 any one, it is characterised in that further include：The first relay and the second relay is controlled to be attracted；The second ac bus voltage between the first relay group and power grid is less than second threshold or more than the 3rd threshold value In the case of, the first controller controls the first relay to disconnect, and indicates that second controller controls the second relay to disconnect；Wherein The second threshold is less than the 3rd threshold value.
- 19. control method according to claim 14, it is characterised in that further include：First controller is in the case where the first relay and the second relay disconnect, and the 5th relay of control is attracted, so as to right Dc-link capacitance charges；In the case where DC bus-bar voltage is more than the 4th threshold value, the first relay of control is attracted first controller, and indicates the Two controllers control the second relay to be attracted；After the actuation of the second relay, the 5th relay of control disconnects first controller.
- A kind of 20. control method of the control circuit based on described in claim 7-12 any one, it is characterised in that including：One in the first relay, the second relay, the 3rd relay, the 4th relay is controlled to disconnect, other actuations；In the case that the first ac bus voltage between the first relay group and rectification module is more than first threshold, really There is contact and is adhered exception in the fixed relay disconnected by control.
- 21. control method according to claim 20, it is characterised in that it is described control the first relay, the second relay, Disconnection, other actuations in 3rd relay, the 4th relay include：Control one in the first relay and the second relay to disconnect, another actuation, and control the 3rd relay and the Four relays are attracted；The method further includes：In the case where determining that being occurred contact by the relay that control disconnects is adhered exception, the first controller controls the first relay Disconnected with the relay being attracted in the second relay by control, and indicate that second controller controls the 3rd relay and the 4th relay Device disconnects.
- 22. control method according to claim 21, it is characterised in that further include：In the case where determining that being occurred contact by the relay that control disconnects is adhered exception, second controller does not have in preset time In the case of having the instruction for receiving the first controller, the 3rd relay of active control and the 4th relay disconnect.
- 23. control method according to claim 20, it is characterised in that it is described control the first relay, the second relay, Disconnection, other actuations in 3rd relay, the 4th relay include：Control the first relay and the second relay to be attracted, and control one in the 3rd relay and the 4th relay to break Open, another actuation；The method further includes：In the case where determining that being occurred contact by the relay that control disconnects is adhered exception, the first controller controls the first relay Disconnected with the second relay, and indicate that second controller controls the relay being attracted in the 3rd relay and the 4th relay by control Device disconnects.
- 24. according to the control method described in claim 20-23 any one, it is characterised in thatThe first relay, the second relay, the 3rd relay and the 4th relay is controlled to be attracted；The second ac bus voltage between the first relay group and power grid is less than second threshold or more than the 3rd threshold value In the case of, the first controller controls the first relay and the second relay to disconnect, and indicate second controller control the 3rd after Electric appliance and the 4th relay disconnect；Wherein described second threshold is less than the 3rd threshold value.
- 25. control method according to claim 20, it is characterised in that further include：In the case where whole relays disconnect, the 3rd relay of control is attracted first controller, and indicates second controller control Make the actuation of the 4th relay；After the actuation of the 4th relay, the 5th relay of control is attracted, to be carried out to dc-link capacitance Charging；In the case where DC bus-bar voltage is more than the 4th threshold value, the first relay of control is attracted first controller, and indicates the Two controllers control the second relay to be attracted；After the actuation of the second relay, the 5th relay of control disconnects.
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| CN201711326209.7A CN107919655B (en) | 2017-12-13 | 2017-12-13 | Control circuit, control method and air conditioner |
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| CN201711326209.7A CN107919655B (en) | 2017-12-13 | 2017-12-13 | Control circuit, control method and air conditioner |
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| CN112393379A (en) * | 2020-11-19 | 2021-02-23 | 珠海格力电器股份有限公司 | Compressor driving circuit, power-off protection method thereof and air conditioner |
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| CN107919655B (en) | 2023-07-11 |
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