CN109545620A - A kind of the protection circuit and method of relay - Google Patents
A kind of the protection circuit and method of relay Download PDFInfo
- Publication number
- CN109545620A CN109545620A CN201811326436.4A CN201811326436A CN109545620A CN 109545620 A CN109545620 A CN 109545620A CN 201811326436 A CN201811326436 A CN 201811326436A CN 109545620 A CN109545620 A CN 109545620A
- Authority
- CN
- China
- Prior art keywords
- relay
- triode
- resistance
- control module
- protection circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/002—Monitoring or fail-safe circuits
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
- H01H47/18—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay for introducing delay in the operation of the relay
Abstract
The embodiment of the invention discloses the protection circuits and method of a kind of relay, are related to frequency converter field, solve the problems, such as that the contact of the onboard relay when compressor or motor operate is burned out.The specific scheme is that the protection circuit of relay includes processor, switch module and control module；The first end of the first end connection switch module of processor, the first end of the second end link control module of switch module, the second end of control module, for connecting relay；The second end of processor is used for connecting power device；Control module, for when switch module disconnects, control relay to be disconnected；Processor is used in power device operation, the on off operating mode of detection switch module, and after the turn-off time for determining switch module persistently reaches preset time, control power device is shut down；Preset time is less than the sluggish disengaging time of relay.During contact of the embodiment of the present invention for relay disconnects under high voltage and high current.
Description
Technical field
The present embodiments relate to frequency converter field more particularly to the protection circuits and method of a kind of relay.
Background technique
In the prior art, frequency converter is widely used in the equipment such as air conditioner, refrigerator, washing machine, can will be in frequency converter
A.C. contactor for on-off bus current replaces with onboard relay, excessively leads to avoid the wiring due to A.C. contactor
It causes to generate the interference such as stray inductance.
When application of frequency converter is in air conditioner, carries out the on-off of electric current using onboard relay, in compressor or motor
In the case where operating, if refrigerant pressure in pipeline is more than limit value, show that the electric current in circuit is larger, at this time with piping connection
Pressure switch (Pressure Switch, PSH) will disconnect.Since pressure switch is also connect with the control terminal of onboard relay,
Therefore after pressure switch disconnects, the control terminal of onboard relay can be made also to disconnect.At this point, if the high current in circuit is three-phase
Electricity after over commutation, include direct current and alternating current ingredient electric current, then the electric current will not zero crossing, that is to say, that onboard
When the control terminal of relay disconnects, DC high voltage and high current can be born between the contact of onboard relay.
But since the DC voltage between the contact of onboard relay is bigger, resistance to electric current is smaller, after three-phase electric rectification
DC voltage under, the resistance to electric current of onboard relay only has several hundred milliamperes, therefore onboard relay is in DC high voltage and height electricity
When flowing down disconnection, contact can be burned out.
Summary of the invention
The present invention provides the protection circuit and method of a kind of relay, solve compressor or motor operating when it is onboard after
The problem of contact of electric appliance is burned out.
In order to achieve the above objectives, the present invention adopts the following technical scheme:
In a first aspect, the present invention provides a kind of protection circuit of relay, the protection circuit of the relay includes: processing
Device, switch module and control module.
Wherein, the first end of the first end connection switch module of processor, the second end link control module of switch module
First end, the second end of control module, for connecting relay；The second end of processor is used for connecting power device.
Control module, for when switch module disconnects, control relay to be disconnected；Processor, for being transported in power device
When row, the on off operating mode of detection switch module, and after the turn-off time for determining switch module persistently reaches preset time, control
Power device is shut down；Preset time be less than relay sluggish disengaging time, sluggish disengaging time be from relay down to after
The time that the contact of electric appliance disconnects.
With reference to first aspect, in one possible implementation, switch module includes: pressure switch, first resistor,
Two resistance and capacitor.
Wherein, the first end of first resistor is the first end of switch module, and the second end of first resistor is switch module
Second end.The first end of first resistor and the first end of capacitor connect, the second end ground connection of capacitor, also first with pressure switch
End connection；The second end of first resistor and the first end of second resistance connect, and also connect with the second end of pressure switch；Second electricity
The second end of resistance connects power supply.
With reference to first aspect with above-mentioned possible implementation, in alternatively possible implementation, control module packet
It includes: the first triode, the second triode, third transistor, the 4th triode and 3rd resistor, the 4th resistance, the 5th electricity
Resistance, the 6th resistance, the 7th resistance, the 8th resistance.
Wherein, the base stage of the first triode is the first end of control module, and the emitter of the first triode is grounded, the one or three
The collector of pole pipe and the first end of 3rd resistor connect；
The third end of the base stage connection processor of second triode, the emitter ground connection of the second triode, the second triode
Collector and third transistor base stage connect, also the first end with the first end of 3rd resistor, the 4th resistance is separately connected；
The second end of 3rd resistor connects power supply with the second end of the 4th resistance；
The emitter of third transistor is grounded, the collector of third transistor respectively with the first end of the 5th resistance, the 6th
The first end of resistance connects；The second end of 6th resistance is connect with the base stage of the 4th triode, the second end of the 5th resistance and the
The first end of seven resistance connects, and also connect with the emitter of the 4th triode, and the second end of the 7th resistance connects power supply；Four or three
The second end of the current collection of pole pipe extremely control module；
8th resistor coupled in parallel is between the base stage and emitter of the 4th triode；
Control module is specifically used for when pressure switch disconnects, the first triode ON, third transistor cut-off, the 4th
Triode cut-off, to control relay disconnection.
With reference to first aspect with above-mentioned possible implementation, in alternatively possible implementation, control module is gone back
For when pressure switch does not disconnect, the cut-off of the first triode to receive the high level of the three-polar output of processor, the two or three pole
Pipe conducting, third transistor cut-off, the 4th triode cut-off, to control relay disconnection.
With reference to first aspect with above-mentioned possible implementation, in alternatively possible implementation, control module is gone back
For when pressure switch does not disconnect, the cut-off of the first triode to receive the low level of the three-polar output of processor, the two or three pole
Pipe cut-off, third transistor conducting, the 4th triode ON, to control relay closure.
With reference to first aspect with above-mentioned possible implementation, in alternatively possible implementation, power device is
Compressor or motor.
Second aspect, the present invention provide a kind of guard method of relay, and this method is applied to such as first aspect or first
The protection circuit of the relay of any one of the possible implementation of aspect.This method may include: to run in power device
When, detect the on off operating mode of pressure switch；When determining that pressure switch disconnects, control relay is disconnected；Determining pressure switch
Turn-off time when persistently reaching preset time, control power device is shut down；Wherein, preset time is less than the sluggishness point of relay
From the time, sluggish disengaging time is the time disconnected from relay down to the contact of relay.
It can also include: in the disconnection for determining pressure switch in one possible implementation in conjunction with second aspect
Between when being less than preset time, judge frequency converter with the presence or absence of failure；If there is failure, then power device shutdown is controlled, and defeated
Warning message out, there are failures for prompting user's frequency converter for the warning message；If not there is no failure, power device is kept
It continues to run.
The third aspect, the present invention provide a kind of frequency converter, which may include: such as first aspect or first aspect
The protection circuit of the relay of any one of possible implementation.And the frequency converter can be applied to air conditioner, refrigerator, laundry
In the equipment such as machine.
The protection circuit of relay provided by the invention, processor can be lasted up in the turn-off time for determining switch module
To after preset time, control power device shut down, the preset time be less than relay sluggish disengaging time, so that after
Before the contact of electric appliance disconnects, by the electric current of the contact of relay close to zero, so that the contact of relay can pacify
Complete reliable disconnection, will not be burned out.
Detailed description of the invention
Fig. 1 is a kind of schematic diagram of the protection circuit of relay provided in an embodiment of the present invention；
Fig. 2 is the schematic diagram of the protection circuit of another relay provided in an embodiment of the present invention；
Fig. 3 is the schematic diagram of the protection circuit of another relay provided in an embodiment of the present invention；
Fig. 4 is the schematic diagram of the protection circuit of another relay provided in an embodiment of the present invention；
Fig. 5 is a kind of flow chart of the guard method of relay provided in an embodiment of the present invention；
Fig. 6 is a kind of schematic diagram of frequency converter provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 1 is a kind of schematic diagram of the protection circuit of relay provided in an embodiment of the present invention, as shown in Figure 1, the relay
The protection circuit of device may include: processor 11, switch module 12 and control module 13.
Wherein, the second end of the first end of the first end connection switch module 12 of processor 11, switch module 12 connects control
The first end of molding block 13, the second end of control module 13, for connecting relay；The second end of processor 11, for connecting
Power device.
Control module 13, for when switch module 12 disconnects, control relay to be disconnected.
Processor 11 is used in power device operation, the on off operating mode of detection switch module 12, and is determining switching molding
After the turn-off time of block 12 persistently reaches preset time, control power device is shut down.Wherein, preset time is less than the slow of relay
Stagnant disengaging time, sluggish disengaging time are the time disconnected from relay down to the contact of relay.
It should be noted that in embodiments of the present invention, power device can be compressor or motor.In addition, of the invention
The relay that embodiment is related to is common relay, rather than the DC relay of high price.
The protection circuit of relay provided by the invention, processor can be lasted up in the turn-off time for determining switch module
To after preset time, control power device shut down, the preset time be less than relay sluggish disengaging time, so that after
Before the contact of electric appliance disconnects, by the electric current of the contact of relay close to zero, so that the contact of relay can pacify
Complete reliable disconnection, will not be burned out.
Further, in embodiments of the present invention, as shown in Fig. 2, switch module 12 may include: pressure switch PSH,
One resistance, second resistance and capacitor.It with first resistor is R1 in Fig. 2, second resistance R2, capacitor are that C is to exemplify.
Wherein, the first end of resistance R1 is the first end of switch module 12, and the second end of resistance R1 is switch module 12
Second end.
The first end of resistance R1 is connect with the first end of capacitor C, the second end of capacitor C ground connection, also the with pressure switch
One end connection；The second end of resistance R1 is connect with the first end of resistance R2, is also connect with the second end of pressure switch；Resistance R2's
Second end connects power supply.
Further, in embodiments of the present invention, as shown in figure 3, control module 13 may include: the first triode,
Two triodes, third transistor, the 4th triode and 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th electricity
Resistance, the 8th resistance.With four triodes be respectively Q1, Q2, Q3, Q4 in Fig. 3, six resistance be respectively R3, R4, R5, R6,
R7, R8 are to exemplify.
Wherein, the base stage of triode Q1 is the first end of control module 13, the emitter ground connection of triode Q1, triode Q1
Collector connect with the first end of resistance R3.
The third end of the base stage connection processor 11 of triode Q2, the emitter ground connection of triode Q2, the collection of triode Q2
Electrode is connect with the base stage of triode Q3, and also the first end with the first end of resistance R3, resistance R4 is separately connected；The of resistance R3
Two ends connect power supply with the second end of resistance R4.
The emitter of triode Q3 is grounded, the collector of triode Q3 respectively with the first end of resistance R5, resistance R6 the
One end connection；The second end of resistance R6 is connect with the base stage of triode Q4, and the second end of resistance R5 and the first end of resistance R7 connect
It connects, is also connect with the emitter of triode Q4, the second end of resistance R7 connects power supply；The current collection of triode Q4 extremely control module
13 second end.
Resistance R8 is connected in parallel between the base stage and emitter of triode Q4.
Control module 13 is specifically used for the triode Q1 conducting when pressure switch disconnects, triode Q3 cut-off, triode
Q4 cut-off, to control relay disconnection.At this point, no matter the three-polar output high level or low level of processor 11, i.e., without
By triode Q2 on or off, triode Q4 can be made to end, to control relay disconnection.
It should be noted that in embodiments of the present invention, control module 13 is also used to when pressure switch does not disconnect, three
Pole pipe Q1 cut-off receives the high level of the three-polar output of processor 11, triode Q2 conducting, triode Q3 cut-off, triode
Q4 cut-off, to control relay disconnection.Alternatively, control module 13, is also used to when pressure switch does not disconnect, triode Q1 is cut
Only, the low level of the three-polar output of processor 11, triode Q2 cut-off are received, triode Q3 is connected, triode Q4 conducting, from
And control relay closure.
For the ease of the understanding of those skilled in the art, the present invention by following embodiment to the protection circuit of relay into
Row illustrates.
Illustratively, processor 11 is central processing unit (Central Processing Unit, CPU), switch module 12
It include: pressure switch PSH, resistance R1 and R2 and capacitor C；Control module 13 includes: triode Q1, Q2, Q3, Q4, resistance
R3, R4, R5, R6, R7 and R8, specific circuit diagram are as shown in Figure 4.Wherein, triode Q1, Q2 and Q3 is NPN type triode,
Triode Q4 is PNP type triode.
When PSH is disconnected, the voltage of the base stage of triode Q1 is 5 volts (V), since the emitter of triode Q1 is grounded, electricity
Pressure is 0V, therefore triode Q1 is connected.After triode Q1 conducting, the voltage of the collector of triode Q1 is 0V, i.e. triode Q3
The voltage of base stage be 0V, since the voltage of the emitter of triode Q3 is 0V, be equal to the voltage of base stage, therefore triode Q3
Cut-off.After triode Q3 cut-off, the voltage of the collector of triode Q3 is 15V, i.e., the voltage of the base stage of triode Q4 is 15V,
Since the voltage of the emitter of triode Q4 is 15V, it is equal to the voltage of base stage, therefore triode Q4 ends.Triode Q4 is cut
After only, the voltage of the collector of triode Q4 is 0V, and control relay disconnects.
When PSH is not disconnected, the voltage of the base stage of triode Q1 is 0V, since the emitter of triode Q1 is grounded, voltage
For 0V, therefore triode Q1 ends.If the three-polar output high level of CPU, i.e., the base stage of triode Q2 is high voltage, due to
The emitter of triode Q2 is grounded, therefore triode Q2 is connected.After triode Q2 conducting, the voltage of the collector of triode Q2 is
0V, the i.e. voltage of the base stage of triode Q3 are 0V, and since the voltage of the emitter of triode Q3 is 0V, triode Q3 is cut
Only.After triode Q3 cut-off, the voltage of the collector of triode Q3 is 15V, i.e., the voltage of the base stage of triode Q4 is 15V, by
It is also 15V in the voltage of the emitter of triode Q4, therefore triode Q4 ends.After triode Q4 cut-off, the collection of triode Q4
The voltage of electrode is 0V, and control relay disconnects.
When PSH is not disconnected, the voltage of the base stage of triode Q1 is 0V, since the emitter of triode Q1 is grounded, voltage
For 0V, therefore triode Q1 ends.If the three-polar output low level of CPU, i.e., the voltage of the base stage of triode Q2 is 0V, by
It is grounded in the emitter of triode Q2, therefore triode Q2 ends.After triode Q1 and Q2 are turned off, the collection of triode Q1 and Q2
The voltage of electrode is 5V, i.e., the voltage of the base stage of triode Q3 is 5V, since the voltage of the emitter of triode Q3 is 0V, because
This triode Q3 conducting.After triode Q3 conducting, the voltage of the collector of triode Q3 is 0V, the i.e. electricity of the base stage of triode Q4
Pressure is 0V, since the voltage of the emitter of triode Q4 is 15V, triode Q4 conducting.After triode Q4 conducting, triode
The voltage of the collector of Q4 is 15V, control relay closure.
Fig. 5 is a kind of flow chart of the guard method of relay provided in an embodiment of the present invention, is applied to as in Fig. 1-Fig. 4
The protection circuit of any relay, as shown in figure 5, this method comprises:
201, when power device is run, the on off operating mode of pressure switch is detected.
202, when determining that pressure switch disconnects, control relay is disconnected.
203, when the turn-off time for determining pressure switch persistently reaching preset time, control power device is shut down.
204, when the turn-off time for determining pressure switch being less than preset time, judge frequency converter with the presence or absence of failure.
205, if there is failure, then power device shutdown is controlled, and export warning message.
Wherein, there are failures for prompting user's frequency converter for warning message.
If 206, not there is no failure, power device is kept to continue to run.
In this way, by ensure relay contact disconnect before, the electric current of the contact of relay close to zero so that after
The contact of electric appliance can be safe and reliable disconnection, will not be burned out.
Fig. 6 is a kind of schematic diagram of frequency converter provided in an embodiment of the present invention, as shown in fig. 6, the frequency converter may include:
The protection circuit of relay as described in any in Fig. 1-Fig. 4.
Frequency converter provided in an embodiment of the present invention include above-mentioned relay protection circuit, therefore can achieve with it is above-mentioned after
The identical effect of protection circuit of electric appliance.
Through the above description of the embodiments, it is apparent to those skilled in the art that, for description
It is convenienct and succinct, only the example of the division of the above functional modules, in practical application, can according to need and will be upper
It states function distribution to be completed by different functional modules, i.e., the internal structure of device is divided into different functional modules, to complete
All or part of function described above.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Change or replacement in the technical scope disclosed by the present invention, should be covered by the protection scope of the present invention.Therefore, this hair
Bright protection scope should be based on the protection scope of the described claims.
Claims (9)
1. a kind of protection circuit of relay, which is characterized in that the protection circuit of the relay includes: processor, switching molding
Block and control module；
Wherein, the first end of the processor connects the first end of the switch module, the second end connection of the switch module
The first end of the control module, the second end of the control module, for connecting relay；The second end of the processor,
For connecting power device；
The control module, for controlling the relay and disconnecting when the switch module disconnects；
The processor, for detecting the on off operating mode of the switch module, and determining in power device operation
State switch module turn-off time persistently reach preset time after, control the power device and shut down；The preset time is less than
The sluggish disengaging time of the relay, the sluggishness disengaging time is from the relay down to the contact of the relay
The time of disconnection.
2. the protection circuit of relay according to claim 1, which is characterized in that the switch module includes: that pressure is opened
Pass, first resistor, second resistance and capacitor；
Wherein, the first end of the first resistor is the first end of the switch module, and the second end of the first resistor is institute
State the second end of switch module；
The first end of the first resistor is connect with the first end of the capacitor, the second end of capacitor ground connection, also with it is described
The first end of pressure switch connects；The second end of the first resistor is connect with the first end of the second resistance, also with it is described
The second end of pressure switch connects；The second end of the second resistance connects power supply.
3. the protection circuit of relay according to claim 2, which is characterized in that the control module includes: the one or three
Pole pipe, the second triode, third transistor, the 4th triode and 3rd resistor, the 4th resistance, the 5th resistance, the 6th electricity
Resistance, the 7th resistance, the 8th resistance；
Wherein, the base stage of first triode is the first end of the control module, and the emitter of first triode connects
The collector on ground, first triode is connect with the first end of the 3rd resistor；
The base stage of second triode connects the third end of the processor, the emitter ground connection of second triode, institute
The collector for stating the second triode is connect with the base stage of the third transistor, also with the first end of the 3rd resistor, described
The first end of 4th resistance is separately connected；The second end of the 3rd resistor connects power supply with the second end of the 4th resistance；
The emitter of the third transistor is grounded, the collector of the third transistor respectively with the 5th resistance first
The first end connection at end, the 6th resistance；The second end of 6th resistance is connect with the base stage of the 4th triode, institute
The second end for stating the 5th resistance is connect with the first end of the 7th resistance, is also connect with the emitter of the 4th triode,
The second end of 7th resistance connects power supply；The second end of the extremely described control module of current collection of 4th triode；
8th resistor coupled in parallel is between the base stage and emitter of the 4th triode；
The control module is specifically used for when the pressure switch disconnects, first triode ON, the three or three pole
Pipe cut-off, the 4th triode cut-off, disconnects to control the relay.
4. the protection circuit of relay according to claim 3, which is characterized in that
The control module is also used to when the pressure switch does not disconnect, and the first triode cut-off receives the processing
The high level of the three-polar output of device, second triode ON, the third transistor cut-off, the 4th triode are cut
Only, it is disconnected to control the relay.
5. the protection circuit of relay according to claim 3, which is characterized in that
The control module is also used to when the pressure switch does not disconnect, and the first triode cut-off receives the processing
The low level of the three-polar output of device, the second triode cut-off, the third transistor conducting, the 4th triode are led
It is logical, to control the relay closure.
6. the protection circuit of relay according to claim 1, which is characterized in that the power device is compressor or electricity
Machine.
7. a kind of guard method of relay, applied to the protection circuit of relay such as of any of claims 1-6,
It is characterized in that, which comprises
In power device operation, the on off operating mode of pressure switch is detected；
When determining that the pressure switch disconnects, control relay is disconnected；
When determining that the turn-off time of the pressure switch persistently reaches preset time, controls the power device and shut down；Wherein,
The preset time be less than the relay sluggish disengaging time, it is described sluggishness disengaging time be from the relay down to
The time that the contact of the relay disconnects.
8. the guard method of relay according to claim 7, which is characterized in that the method also includes:
When the turn-off time for determining the pressure switch being less than the preset time, judge frequency converter with the presence or absence of failure；
It if there is failure, then controls the power device and shuts down, and export warning message, the warning message is used for prompting
There are failures for frequency converter described in family；
If not there is no failure, the power device is kept to continue to run.
9. a kind of frequency converter, which is characterized in that the frequency converter includes: such as relay of any of claims 1-6
Protection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811326436.4A CN109545620B (en) | 2018-11-08 | 2018-11-08 | Protective circuit and method of relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811326436.4A CN109545620B (en) | 2018-11-08 | 2018-11-08 | Protective circuit and method of relay |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109545620A true CN109545620A (en) | 2019-03-29 |
| CN109545620B CN109545620B (en) | 2020-02-04 |
Family
ID=65845451
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811326436.4A Active CN109545620B (en) | 2018-11-08 | 2018-11-08 | Protective circuit and method of relay |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109545620B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110594953A (en) * | 2019-09-09 | 2019-12-20 | 广东美的暖通设备有限公司 | Compressor driving device, compressor pressure protection method and air conditioner |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030218847A1 (en) * | 2002-01-28 | 2003-11-27 | Vehicle Enhancement Systems, Inc. | Solid state relay/circuit breaker system |
| CN201893293U (en) * | 2010-11-29 | 2011-07-06 | 许继集团有限公司 | Arcless switching relay |
| CN203225213U (en) * | 2013-03-22 | 2013-10-02 | 深圳市慧锐通智能电器股份有限公司 | A protecting circuit used for protecting contacts of a relay |
| CN204740985U (en) * | 2015-06-02 | 2015-11-04 | 深圳市新科瑞电气技术有限公司 | A relay control circuit for converter |
| CN108242794A (en) * | 2018-03-08 | 2018-07-03 | 厦门芯阳科技股份有限公司 | A kind of relay contact protection circuit of control inductive load |
-
2018
- 2018-11-08 CN CN201811326436.4A patent/CN109545620B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030218847A1 (en) * | 2002-01-28 | 2003-11-27 | Vehicle Enhancement Systems, Inc. | Solid state relay/circuit breaker system |
| CN201893293U (en) * | 2010-11-29 | 2011-07-06 | 许继集团有限公司 | Arcless switching relay |
| CN203225213U (en) * | 2013-03-22 | 2013-10-02 | 深圳市慧锐通智能电器股份有限公司 | A protecting circuit used for protecting contacts of a relay |
| CN204740985U (en) * | 2015-06-02 | 2015-11-04 | 深圳市新科瑞电气技术有限公司 | A relay control circuit for converter |
| CN108242794A (en) * | 2018-03-08 | 2018-07-03 | 厦门芯阳科技股份有限公司 | A kind of relay contact protection circuit of control inductive load |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110594953A (en) * | 2019-09-09 | 2019-12-20 | 广东美的暖通设备有限公司 | Compressor driving device, compressor pressure protection method and air conditioner |
| US11933509B2 (en) | 2019-09-09 | 2024-03-19 | Gd Midea Heating & Ventilating Equipment Co., Ltd. | Compressor driving device, compressor pressure protection method, and air conditioner |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109545620B (en) | 2020-02-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101546962B (en) | Power supply device | |
| CN106877277B (en) | A kind of control relay circuit, vehicle control electronics and vehicle | |
| CN109743051A (en) | Drive control circuit and household appliance | |
| CN104979851B (en) | A kind of on-off circuit and its control method | |
| CN103606901A (en) | Electrostatic protection device, intelligent power module and frequency conversion household appliance | |
| CN109545620A (en) | A kind of the protection circuit and method of relay | |
| CN112146253B (en) | Air conditioner and compressor control method thereof | |
| CN201717602U (en) | Noise-proof type anti-electric touch and anti-overheating protector of electric water heater | |
| US11411488B2 (en) | Method and apparatus for controlling modes of inverter circuit, and inverter | |
| CN203747394U (en) | Static protection device, intelligent power module and variable frequency household electrical appliance | |
| CN205248762U (en) | Moulded case circuit breaker residual current protection drive circuit and moulded case circuit breaker | |
| CN203117305U (en) | Three-phase load debug control circuit | |
| CN104935215A (en) | Braking unit | |
| CN208672722U (en) | A kind of DC load fault condition detection circuit | |
| CN105021936A (en) | Method and electric device for detecting electric leakage | |
| CN103314496B (en) | For run electric loading circuit arrangement, for triggering the control device of the drive motor of home appliances, home appliances and the method for running the electric loading in home appliances | |
| CN209497442U (en) | Drive control circuit and household appliance | |
| CN208656661U (en) | A kind of inverter circuit, frequency converter, motor, compressor and air conditioner | |
| CN203813714U (en) | Motor driving device and frequency-conversion household electrical appliance | |
| CN207442712U (en) | Frequency conversion fan tests power supply | |
| CN207265734U (en) | A kind of optional rolling screen door AC motor control of stand-by power supply | |
| CN107046276B (en) | Supply voltage switch protects circuit and voltage conversion apparatus | |
| CN108736759A (en) | A kind of inverter circuit, frequency converter, motor, compressor and air conditioner | |
| CN110460021A (en) | A kind of IGBT protection circuit and air conditioner | |
| CN109660017A (en) | A kind of generator handover control system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |