CN207251186U - Electronic protector - Google Patents
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- CN207251186U CN207251186U CN201721053977.5U CN201721053977U CN207251186U CN 207251186 U CN207251186 U CN 207251186U CN 201721053977 U CN201721053977 U CN 201721053977U CN 207251186 U CN207251186 U CN 207251186U
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Abstract
A kind of electronic protector is the utility model is related to, is made of perception unit and control unit.Perceiving unit includes thermistor and current transformer；Control unit includes microcontroller, bidirectional triode thyristor, photoelectrical coupler, comparator and some resistors.When temperature anomaly, the resistance value of thermistor changes, so that the trigger current for adjusting bidirectional triode thyristor turns it off electric motor loop, achievees the purpose that overheat protector.When current anomaly; the current anomaly signal that current transformer is perceived is by circuit conversion into voltage signal; the positive input of input comparator; compared with the reference voltage of reverse input end; comparator outputs control signals to microcontroller; microcontroller controls photoelectrical coupler to cut off bidirectional triode thyristor trigger signal after signal processing, electric motor loop is turned it off, so as to achieve the purpose that overcurrent protection.
Description
Technical field
A kind of electronic protector is the utility model is related to, realizes motor overheating and overcurrent protection.
Background technology
The supporting thermal protector of current refrigeration compressor, thermal protector be mainly used for refrigeration compressor overtemperature,
Overcurrent protection.In use, thermal protector is close on refrigeration compressor shell or machine winding, when refrigeration compressor passes through
During high current, thermal protector internal heating element moment produces larger heat and causes bimetal leaf bending upset, and makes moving contact
Disconnect, play the protective effect of overload current；In addition, working as refrigeration compressor long time running for some reason, cause to compress
Machine shell or motor winding temperature are excessive, promote bimetal leaf after producing heat superposition along with thermal protector internal heating element
Heated bending is overturn, and disconnects moving contact, plays the protective effect of overtemperature.Upset is bent because of overcurrent and overtemperature
Bimetal leaf, after reset temperature of the residing environment temperature less than bimetal leaf setting, bimetal leaf can automatically reset, and make heat
Protector rearming.
The thermal protector largely used in fields such as refrigerator, compressors of air conditioner at present has built-in and two kinds of external,
With fierce market competition, to reduce compressor design cost, compressor volume is less and less, while in order to extend compressor
Service life, it is ensured that the locked-rotor temperature-rise of compressor and adapt to specific adverse circumstances such as Middle East hot environment, compressor is designing
When often consider reduce locked rotor current (ST) and raising overload electric current (UT) technological means, supporting thermal protector ST/UT
Ratio is constantly reducing, so that built-in and external type heat protector manufacture difficulty increases, in some cases at all with regard to nothing
Method manufactures.If ST and UT can not be met the requirements, when compressor is used in the larger area of hot environment or voltage fluctuation, meeting
The situation for causing protector to protect or do not protect by mistake；Furthermore since mechanical protector break-make is using mechanical contact control, work
When contact it is in the conduction state, work long hours poor environment can make heating of contact bonding, surface blackening, so as to cause contact
Loose contact is even obstructed, or the situation that contact cannot disconnect, these situations are heavy then can draw gently it will cause cisco unity malfunction
Play some disasters.Moreover, mechanical protector during fabrication the final argument caused by the factor such as material and technology controlling and process it is discrete compared with
Greatly（Such as actuation time and resetting time）.
Applicant has applied for the Chinese patent of Patent No. 201220135551.5, its is reasonable in design, can give electricity
Machine is comprehensively and effectively protected, and overload, stall, short circuit, overvoltage, under-voltage, electric leakage, phase shortage, three-phase imbalance, overheat occurs in motor
When, perform protection act.Its operation principle is to need to protect by above-mentioned in sampling element monitoring motor operation course
Parameters, and carry out sample of signal, signal processing, once beyond the scope set by electronic motor protector, i.e.,
Perform protection act.But it still can be improved so that more reliable performance, service life are longer.
Utility model content
The purpose of the utility model is to overcome above-mentioned deficiency existing in the prior art, and a kind of structure design is provided and is closed
The longer electronic protector of more reliable performance, the service life of reason.
The technical scheme in the invention for solving the above technical problem is：
A kind of electronic protector, it is characterised in that：Including perceiving unit and control unit；Perceiving unit includes temperature-sensitive electricity
Resistance and current transformer；Control unit includes microcontroller, bidirectional triode thyristor, photoelectrical coupler and comparator；At the beginning of current transformer
Pole one end is used to connect motor, the T2 ends of current transformer just pole other end connection bidirectional triode thyristor and 6 feet of photoelectrical coupler；
The positive input of current transformer time pole one end connection comparator, the current transformer time pole other end are used to connect DC power supply
Anode；The reverse input end of comparator is used to connect reference voltage, the I ends of the output terminal connection microcontroller of comparator；Photoelectricity coupling
The G ends of the 4 feet connection bidirectional triode thyristor of clutch, the O ends of the 2 feet connection microcontroller of photoelectrical coupler；The T1 ends of bidirectional triode thyristor
For connecting the N-terminal of AC power；1 foot of photoelectrical coupler is used to connect DC power anode；
When the thermistor is posive temperature coefficient thermistor, its connection structure is one kind in following two：
Structure one：One end of the posive temperature coefficient thermistor is connected with the other end of the first pole of current transformer, and electric current
The end of the first pole of mutual inductor is the one end being connected with bidirectional triode thyristor T2 ends, and the posive temperature coefficient thermistor other end connects photoelectricity
Just the pole other end is connected by 6 feet of posive temperature coefficient thermistor and photoelectrical coupler for 6 feet of coupler, i.e. current transformer
Connect；
Structure two：The posive temperature coefficient thermistor one end connects 1 foot of photoelectrical coupler, posive temperature coefficient thermistor
The other end is used to connect DC power anode, i.e. 1 foot of photoelectrical coupler connects direct current by posive temperature coefficient thermistor
Source cathode；
When the thermistor is negative tempperature coefficient thermistor, its connection structure is：Negative tempperature coefficient thermistor
One end connects 1 foot of photoelectrical coupler and for connecting DC power anode, and the negative tempperature coefficient thermistor other end is used to connect
Connect DC power cathode.
The utility model further includes No.1 divider resistance and No. two divider resistances；Current transformer time pole one end connection No.1
Divider resistance one end, the other end connection comparator positive input of No.1 divider resistance, current transformer time pole one end passes through
No.1 divider resistance connects the positive input of comparator；The current transformer time pole other end connects No. two divider resistance one end；
The other end of No.1 divider resistance connects the other end of No. two divider resistances.
The utility model further includes current-limiting resistance；
When the connection structure of the thermistor is structure a period of time, current-limiting resistance one end connects 1 foot of photoelectrical coupler,
The current-limiting resistance other end is used to connect DC power anode, and 1 foot of photoelectrical coupler is connecting DC power supply just by current-limiting resistance
Pole；
When the connection structure of the thermistor is structure two or the thermistor is negative temperature coefficient heat-sensitive
During resistance, one end of current-limiting resistance is connected with one end of the first pole of current transformer, current-limiting resistance other end connection photoelectrical coupler
6 feet, current transformer just pole one end pass through 6 feet of current-limiting resistance and photoelectrical coupler connect.
When thermistor described in the utility model is negative tempperature coefficient thermistor, No. three divider resistances are further included；Three
1 foot of number divider resistance one end connection photoelectrical coupler and negative tempperature coefficient thermistor one end, No. three divider resistance other ends
For connecting DC power anode, 1 foot of photoelectrical coupler connects DC power anode by No. three divider resistances.
A kind of guard method of electronic protector, it is characterised in that：Step is as follows：
Motor normal course of operation is：After the power is turned on, microcontroller obtains power on signal to AC power, controls its O end to keep low
Level, connects DC power cathode；By the luminescent device in DC power anode, photoelectrical coupler, the O ends of microcontroller, direct current
The photoelectrical coupler input control circuit that power cathode is formed produces electric current, which send out the luminescent device in photoelectrical coupler
Light, so that the light-sensitive device of photoelectrical coupler is connected；The L ends of AC power, motor, current transformer primary, photoelectric coupling
The light-sensitive device of device, the G ends of bidirectional triode thyristor and T1 ends, the N-terminal of AC power form the triggering control loop of bidirectional triode thyristor,
Turned between the T2 ends and T1 ends of triggering bidirectional triode thyristor, make motor normal operation；
The protection process of current transformer is as follows：
The perception voltage of motor operation comparator positive input in running current is reversely defeated no more than comparator
Enter the reference voltage at end；When motor because of exception and operating current increase when, current transformer just electrode current increase, secondary induction electricity
The corresponding increase of stream, the perception voltage for being input to comparator positive input also increase, this perceives voltage and is and AC mains cycle
Identical AC sine wave voltage, reference voltage are direct current fixed level voltage, perceive level in voltage and consolidate more than reference voltage
Determine comparator output terminal during the section of level and export high level, so as to produce the rectangle identical with AC mains cycle in output terminal
Impulse wave, is input to the I ends of microcontroller, after microcontroller receives the rectangular wave pulse, rectangular wave pulse is counted, is counted
The rectangular pulse wave number obtained is also AC mains cycle number in fact, because a rectangle only occurs in each AC sine wave period
Wave impulse, because the AC mains cycle time is fixed, so by conversion can be obtained time delay；Set when time delay reaches
During the fixed time, the O ends of microcontroller can export high level, make the input control circuit no current of photoelectrical coupler, photoelectric coupling
The luminescent device of device does not shine, and the light-sensitive device of photoelectrical coupler is not turned on, and bidirectional triode thyristor is cut off without trigger current, motor
It is out of service；
The protection process of thermistor is as follows：
The thermistor is posive temperature coefficient thermistor, its connection structure is structure a period of time：Motor operation is just
The trigger current of bidirectional triode thyristor, which is more than, during normal temperature maintains electric current；When motor because of exception and temperature raise when, positive temperature coefficient
The resistance of thermistor gradually increases, and trigger current is gradually reduced, when less than its maintain electric current when, the T2 ends of bidirectional triode thyristor and
T1 is turned off between end, and motor is out of service；
The thermistor is posive temperature coefficient thermistor, when its connection structure is structure two：Motor operation is just
During normal temperature, the electric current in photoelectrical coupler input control circuit triggers its luminescent device and shines enough, so that photoelectrical coupler
Light-sensitive device conducting, make bidirectional triode thyristor triggering and conducting, motor normal work；When motor because of exception and temperature raise when, just
The resistance of temperature coefficient thermistor gradually increases, and the electric current in the input control circuit of photoelectrical coupler is gradually reduced, and works as electric current
Luminescent device cannot be maintained to shine, the light-sensitive device shut-off of photoelectrical coupler, bidirectional triode thyristor makes T2 ends because of no trigger current
Turned off between T1 ends, motor is out of service；
When the thermistor is negative tempperature coefficient thermistor：Motor operation is in normal temperature, photoelectrical coupler
Interior luminescent device shines, so that the light-sensitive device conducting of photoelectrical coupler, makes bidirectional triode thyristor triggering and conducting, motor is normal
Work；When motor because of exception and temperature raise when, the resistance of negative tempperature coefficient thermistor is gradually reduced, photoelectrical coupler it is defeated
The electric current for entering control loop is gradually reduced, and when electric current cannot maintain luminescent device to shine, the light-sensitive device of photoelectrical coupler turns off,
Bidirectional triode thyristor makes to turn off between T2 ends and T1 ends because of no trigger current, and motor is out of service.
The utility model compared with prior art, has the following advantages and effect：For conventional double-metal sheet type temperature
Manufacture difficulty is big during particular requirement present in the compound protector of electric current, is difficult in adapt to various adverse circumstances and mechanical contact
The drawbacks of existing, the utility model can solve problem above, and multiple functional, dependable performance, parameter setting are convenient.This practicality
Novel protected parameter can arbitrarily be set by the setting of software or hardware, and solve that thermal protector ST and UT be difficult to take into account asks
Topic, prevents motor use and occurs protecting by mistake in various adverse circumstances or do not protect phenomenon.Utility model works principle is logical
Cross and perceive unit acquisition electric current or abnormal signal of temperature when motor works, by circuit conversion and control, shut-off or reduction
The trigger current of bidirectional triode thyristor, so as to cut off motor performance loop, achievees the purpose that protection.The utility model is designed reasonably,
It is multiple functional, motor can be given and comprehensively and effectively protected, in motor overload, stall, short circuit, phase shortage, overheat, it is dynamic to perform protection
Make.
Brief description of the drawings
Fig. 1 is the circuit diagram of the utility model embodiment 1.
Fig. 2 is the circuit diagram of the utility model embodiment 2.
Fig. 3 is the circuit diagram of the utility model embodiment 3.
Fig. 4 is the waveform of the utility model comparator input terminal.
Fig. 5 is the waveform of the utility model comparator output terminal.
Embodiment
Below in conjunction with the accompanying drawings and the utility model is described in further detail by embodiment, and following embodiments are pair
The explanation of the utility model and the utility model is not limited to following embodiments.
Embodiment 1：
The utility model includes perceiving unit and control unit.Perceiving unit includes thermistor and Current Transmit.
Control unit include single-chip microprocessor MCU, bidirectional triode thyristor T, photoelectrical coupler IC2, comparator IC1, No.1 divider resistance R1, No. two
Divider resistance R2 and current-limiting resistance R3.
One end of the first pole one end connection motor RL of Current Transmit, Current Transmit just pole other end connection is two-way can
Control the T2 ends of silicon T and 6 feet of photoelectrical coupler.Current Transmit time pole one end connection No.1 divider resistance R1 one end, No.1
The other end connection comparator IC1 positive inputs of divider resistance R1, Current Transmit time pole one end passes through No.1 partial pressure electricity
Hinder the positive input of R1 connection comparators IC1；The Current Transmit time pole other end connect No. two divider resistance R2 one end and
DC power cathode Vss；The other end of No.1 divider resistance R1 connects the other end of No. two divider resistance R2.Comparator IC1 is anti-
Reference voltage Uref is connected to input terminal, comparator IC1 output terminals connect the I ends of single-chip microprocessor MCU.4 feet of photoelectrical coupler IC2
Connect the G ends of bidirectional triode thyristor T, the O ends of the 2 feet connection single-chip microprocessor MCU of photoelectrical coupler IC2；The T1 ends of bidirectional triode thyristor T connect
Connect the N-terminal of AC power Uac；The 1 foot connection DC power anode Vcc of photoelectrical coupler IC2.
Current Transmit, No.1 divider resistance R1, No. two divider resistance R2, comparator IC1 composition over current of motor protections
Circuit.
Thermistor is posive temperature coefficient thermistor PTC, one end of posive temperature coefficient thermistor PTC and Current Mutual Inductance
One end connection of the first poles of device CT, Current Transmit are just connected at the end of pole with the T2 ends of bidirectional triode thyristor T, positive temperature coefficient heat
6 feet of quick resistance PTC other ends connection photoelectrical coupler IC2, i.e., just the pole other end passes through positive temperature coefficient to Current Transmit
6 feet of thermistor PTC and photoelectrical coupler connect.1 foot of current-limiting resistance R3 one end connection photoelectrical coupler IC2, current limliting electricity
R3 other ends connection DC power anode Vcc is hindered, i.e. 1 foot of photoelectrical coupler IC2 passes through current-limiting resistance R3 connection DC power supplies
Cathode Vcc.
The effect of thermistor is temperature when perceiving motor RL operations；The effect of Current Transmit is to perceive motor RL
Electric current during operation；No.1 divider resistance R1 and No. two divider resistance R2 to the current sensing signal of Current Transmit secondary into
Row partial pressure, current signal is converted into perceive voltage signal；The effect of comparator IC1 is will to perceive voltage Ug and reference voltage
Uref is compared, and comparative result signal is exported in output terminal；The effect of single-chip microprocessor MCU is to receive the ratio of comparator IC1 outputs
Compared with consequential signal, 2 feet of photoelectrical coupler IC2 are output control signals to after delay process；The effect of photoelectrical coupler IC2 is
Isolate the ac high-voltage of bidirectional triode thyristor T and the DC low-voltage control signal of input terminal；The effect of current-limiting resistance R3 is to adjust light
The electric current in electric coupler IC2 input controls circuit, plays metering function；The effect of bidirectional triode thyristor T is to turn on or turns off motor and returns
Road, is the final performer of protection.
A kind of guard method of electronic protector, thermistor are temperature sensing element, when temperature anomaly, temperature-sensitive electricity
The resistance value of resistance changes, so that the trigger current for adjusting bidirectional triode thyristor T turns it off electric motor loop, reaches overheat protector
Purpose；Current Transmit is current sensing element, and when current anomaly, the current anomaly that Current Transmit is perceived is believed
Number by circuit conversion into voltage signal, the positive input of input comparator IC1, carries out with the reference voltage of reverse input end
Compare, comparator IC1 outputs control signals to single-chip microprocessor MCU, and microcontroller controls photoelectrical coupler IC2 to cut off after signal processing
Bidirectional triode thyristor T trigger signals, turn it off electric motor loop, so as to achieve the purpose that overcurrent protection.
Comprise the following steps that：
Motor normal course of operation is：After the power is turned on, single-chip microprocessor MCU obtains power on signal to AC power Uac, controls its O end
Low level is kept, that is, connects DC power cathode Vss.By the luminescent device in DC power anode Vcc, photoelectrical coupler IC2,
The photoelectrical coupler input control circuit that the O ends of single-chip microprocessor MCU, DC power cathode Vss are formed produces electric current, which makes light
Luminescent device in electric coupler IC2 shines, so that the light-sensitive device of photoelectrical coupler IC2 is connected；The L of AC power Uac
End, motor RL, Current Transmit primary, the light-sensitive device, two-way of posive temperature coefficient thermistor PTC, photoelectrical coupler IC2
The G ends and T1 ends of silicon-controlled T, the N-terminal of AC power Uac form the triggering control loop of bidirectional triode thyristor T, and triggering is two-way controllable
Turned between the T2 ends and T1 ends of silicon T, connect electric motor loop, make motor RL normal operations.
The protection process of current transformer is as follows：
By the Current Transmit, No.1 divider resistance R1, No. two divider resistance R2 of selecting suitable parameters, it is ensured that motor
It is reversely defeated to be not more than comparator IC1 by the perception voltage Ug of comparator IC1 positive inputs when RL operates in running current
Enter the reference voltage Uref at end.When motor RL because of exception and operating current increase when, Current Transmit just electrode current increase, it is secondary
Level sensing electric current accordingly increases, and by the partial pressure of No.1 divider resistance R1 and No. two divider resistance R2, is being input to comparator IC1 just
Perception voltage Ug to input terminal also increases, and it is the AC sine wave voltage identical with AC mains cycle that this, which perceives voltage, base
Quasi- voltage Uref is direct current fixed level voltage, according to the operation principle of comparator IC1, when the level of positive input is more than
During the level of reverse input end, output terminal will export high level, and electricity is fixed so perceiving level in voltage and being more than reference voltage
Comparator IC1 output terminals can export high level during flat section, so as to produce the square identical with AC mains cycle in output terminal
Shape impulse wave, referring to Fig. 4 and Fig. 5, is input to the I ends of single-chip microprocessor MCU, after single-chip microprocessor MCU receives rectangular wave pulse, to rectangle
Impulse wave is counted, and the rectangular pulse wave number counted is also AC mains cycle number in fact, because each AC sine wave
A Square wave pulses only occur in cycle, because the AC mains cycle time is fixed, so can be postponed by conversion
Time.When time delay reaching the time of software set, the O ends of single-chip microprocessor MCU can export high level, make photoelectrical coupler
IC2 input controls circuit no current, its internal illumination device do not shine, and the light-sensitive device of photoelectrical coupler IC2 is not turned on, two-way
Silicon-controlled T cuts off electric motor loop without trigger current, and motor RL is out of service.
The protection process of thermistor is as follows：
By the posive temperature coefficient thermistor PTC for selecting suitable parameters, it is ensured that motor RL operates in double during normal temperature
To silicon-controlled T trigger current be more than maintain electric current, when motor RL because of exception and temperature raise when, posive temperature coefficient thermistor
The resistance of PTC gradually increases, and trigger current is gradually reduced, when maintaining electric current less than it, the T2 ends and T1 ends of bidirectional triode thyristor T
Between turn off, motor RL is out of service.
Embodiment 2：
The present embodiment with implement 1 difference lies in：
One end of current-limiting resistance R3 is connected with one end of the first pole of Current Transmit, and the end of the first pole of Current Transmit is
The one end being connected with the T2 ends of bidirectional triode thyristor T, 6 feet of current-limiting resistance R3 other ends connection photoelectrical coupler IC2, i.e. electric current are mutual
Just pole one end is connected sensor CT by 6 feet of current-limiting resistance R3 and photoelectrical coupler.Posive temperature coefficient thermistor PTC one end connects
Connect 1 foot of photoelectrical coupler IC2, posive temperature coefficient thermistor PTC other ends connection DC power anode Vcc, photoelectric coupling
1 foot of device IC2 passes through posive temperature coefficient thermistor PTC connection DC power anodes Vcc.
The protection process of thermistor is as follows：By the posive temperature coefficient thermistor PTC for selecting suitable parameters, it is ensured that electricity
When machine RL operates in normal temperature, the electric current in photoelectrical coupler IC2 input controls circuit triggers its luminescent device and shines enough, from
And the light-sensitive device of photoelectrical coupler IC2 is turned on, make bidirectional triode thyristor T triggering and conductings, motor normal work.When motor is because different
When normal and temperature raises, the resistance of posive temperature coefficient thermistor PTC gradually increases, photoelectrical coupler IC2 input controls circuit
Electric current be gradually reduced, when electric current cannot maintain luminescent device to shine, the light-sensitive device shut-off of photoelectrical coupler IC2, it is two-way can
Control silicon T makes to turn off between T2 ends and T1 ends because of no trigger current, and motor RL is out of service.
Embodiment 3：
The present embodiment with implement 2 difference lies in：The thermistor is negative tempperature coefficient thermistor NTC, and is increased
No. three divider resistance R4 are added.1 foot and negative temperature coefficient thermistor power of No. three divider resistance R4 one end connection photoelectrical coupler IC2
NTC one end is hindered, No. three divider resistance R4 other ends connect DC power anode Vcc, and 1 foot of photoelectrical coupler IC2 passes through No. three
Divider resistance R4 connection DC power anodes Vcc；Negative tempperature coefficient thermistor NTC other ends connection DC power cathode Vss.
The protection process of thermistor is as follows：DC power anode Vcc, No. three divider resistance R4, negative temperature coefficient heat-sensitives
Resistance NTC, DC power cathode Vss form bleeder circuit, its partial pressure size depends on the electricity with negative tempperature coefficient thermistor NTC
Resistive.By the negative tempperature coefficient thermistor NTC for selecting suitable parameters, it is ensured that when motor RL operates in normal temperature, bear
The partial pressure of temperature coefficient thermistor NTC and No. three divider resistance R4 trigger the luminescent device hair in photoelectrical coupler IC2 enough
Light, so that the light-sensitive device conducting of photoelectrical coupler IC2, makes bidirectional triode thyristor T triggering and conductings, motor RL normal works.When
Motor because of exception and temperature raise when, the resistance of negative tempperature coefficient thermistor NTC is gradually reduced, negative tempperature coefficient thermistor
The partial pressure of NTC and No. three divider resistance R4 is also gradually reduced, and the electric current in photoelectrical coupler IC2 input controls circuit is gradually subtracted
Small, when the electric current is small to when luminescent device cannot be maintained to shine, the light-sensitive device of photoelectrical coupler IC2 turns off, bidirectional triode thyristor T
Make to turn off between T2 ends and T1 ends because of no trigger current, motor RL is out of service.
Above content described in this specification is only to the utility model structure example explanation；Moreover,
The title that the utility model each several part is taken can not also be same, all constructions according to described in the utility model patent concept, feature and
The equivalent or simple change that principle is done, is included in the protection domain of the utility model patent.
Claims (4)
- A kind of 1. electronic protector, it is characterised in that：Including perceiving unit and control unit；Perceiving unit includes thermistor And current transformer；Control unit includes microcontroller, bidirectional triode thyristor, photoelectrical coupler and comparator；The first pole of current transformer One end is used to connect motor, the T2 ends of current transformer just pole other end connection bidirectional triode thyristor and 6 feet of photoelectrical coupler；Electricity The positive input of current transformer time pole one end connection comparator, the current transformer time pole other end are born for connecting DC power supply Pole；The reverse input end of comparator is used to connect reference voltage, the I ends of the output terminal connection microcontroller of comparator；Photoelectric coupling The G ends of the 4 feet connection bidirectional triode thyristor of device, the O ends of the 2 feet connection microcontroller of photoelectrical coupler；Use at the T1 ends of bidirectional triode thyristor In the N-terminal of connection AC power；1 foot of photoelectrical coupler is used to connect DC power anode；When the thermistor is posive temperature coefficient thermistor, its connection structure is one kind in following two：Structure one：One end of the posive temperature coefficient thermistor is connected with the other end of the first pole of current transformer, and Current Mutual Inductance The end of the first pole of device is the one end being connected with bidirectional triode thyristor T2 ends, and the posive temperature coefficient thermistor other end connects photoelectric coupling Just the pole other end is connected by 6 feet of posive temperature coefficient thermistor and photoelectrical coupler for 6 feet of device, i.e. current transformer；Structure two：The posive temperature coefficient thermistor one end connects 1 foot of photoelectrical coupler, and posive temperature coefficient thermistor is another End is used to connect DC power anode, i.e. 1 foot of photoelectrical coupler is connecting DC power supply just by posive temperature coefficient thermistor Pole；When the thermistor is negative tempperature coefficient thermistor, its connection structure is：Negative tempperature coefficient thermistor one end Connect 1 foot of photoelectrical coupler and for connecting DC power anode, the negative tempperature coefficient thermistor other end is used to connect straight Flow power cathode.
- 2. electronic protector according to claim 1, it is characterised in that：Further include No.1 divider resistance and No. two partial pressures Resistance；Current transformer time pole one end connection No.1 divider resistance one end, the other end connection comparator of No.1 divider resistance is just To input terminal, current transformer time pole one end connects the positive input of comparator by No.1 divider resistance；Current transformer The secondary pole other end connects No. two divider resistance one end；The other end of No.1 divider resistance connects the other end of No. two divider resistances.
- 3. electronic protector according to claim 1, it is characterised in that：Further include current-limiting resistance；When the connection structure of the thermistor is structure a period of time, current-limiting resistance one end connects 1 foot of photoelectrical coupler, current limliting The resistance other end is used to connect DC power anode, and 1 foot of photoelectrical coupler connects DC power anode by current-limiting resistance；When the connection structure of the thermistor is structure two or the thermistor is negative tempperature coefficient thermistor When, one end of current-limiting resistance is connected with one end of the first pole of current transformer, and the 6 of current-limiting resistance other end connection photoelectrical coupler Foot, one end of the first pole of current transformer pass through 6 feet of current-limiting resistance and photoelectrical coupler and connect.
- 4. electronic protector according to claim 1, it is characterised in that：The thermistor is negative temperature coefficient heat During quick resistance, No. three divider resistances are further included；1 foot and negative temperature coefficient heat of No. three divider resistance one end connection photoelectrical couplers Quick resistance one end, No. three divider resistance other ends are used to connect DC power anode, and 1 foot of photoelectrical coupler passes through No. three partial pressures Resistance connects DC power anode.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721053977.5U CN207251186U (en) | 2017-08-22 | 2017-08-22 | Electronic protector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721053977.5U CN207251186U (en) | 2017-08-22 | 2017-08-22 | Electronic protector |
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| Publication Number | Publication Date |
|---|---|
| CN207251186U true CN207251186U (en) | 2018-04-17 |
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| CN201721053977.5U Active CN207251186U (en) | 2017-08-22 | 2017-08-22 | Electronic protector |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107465170A (en) * | 2017-08-22 | 2017-12-12 | 杭州星帅尔电器股份有限公司 | A kind of electronic protector and its guard method |
| CN108981078A (en) * | 2018-08-13 | 2018-12-11 | 奥克斯空调股份有限公司 | A kind of frequency-changeable compressor stall detection method, system and air conditioner |
-
2017
- 2017-08-22 CN CN201721053977.5U patent/CN207251186U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107465170A (en) * | 2017-08-22 | 2017-12-12 | 杭州星帅尔电器股份有限公司 | A kind of electronic protector and its guard method |
| CN107465170B (en) * | 2017-08-22 | 2020-06-30 | 杭州星帅尔电器股份有限公司 | Electronic protector and protection method thereof |
| CN108981078A (en) * | 2018-08-13 | 2018-12-11 | 奥克斯空调股份有限公司 | A kind of frequency-changeable compressor stall detection method, system and air conditioner |
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