CN108281937A - A kind of refrigerator high-low pressure protective device - Google Patents
A kind of refrigerator high-low pressure protective device Download PDFInfo
- Publication number
- CN108281937A CN108281937A CN201711478410.7A CN201711478410A CN108281937A CN 108281937 A CN108281937 A CN 108281937A CN 201711478410 A CN201711478410 A CN 201711478410A CN 108281937 A CN108281937 A CN 108281937A
- Authority
- CN
- China
- Prior art keywords
- operational amplifier
- triode
- resistance
- transformer
- refrigerator
- 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.)
- Withdrawn
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
- H02H3/207—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage also responsive to under-voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
Landscapes
- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
The invention discloses a kind of refrigerator high-low pressure protective devices; including power supply and control device; power supply includes transformer and the current rectifying and wave filtering circuit that is connected with transformer; current rectifying and wave filtering circuit is connected with control device; control device includes the first operational amplifier and second operational amplifier; after the rectified filtering of voltage of transformer; when lower voltage limit of the output voltage of power supply less than second operational amplifier setting; second operational amplifier output is high level; first triode and the second triode ON; the coil of relay obtains electric, refrigerator power-off.When power is restored, delay refrigerator ability work once electrified need to be passed through, simultaneously, since delay makes fluctuating widely in short-term for network voltage relay cannot be made to connect immediately again, thus there is good Anti-Jamming, additionally can avoid control device output level, frequently variation causes to damage caused by relay frequent movement, ensures that refrigerator is run with security and stability.
Description
Technical field
The present invention relates to protective relaying device field more particularly to a kind of refrigerator high-low pressure protective devices.
Background technology
Refrigerator is essential object in people's daily life as common household electrical appliance.In overtension,
Equipment in refrigerator may be burnt, and the serious fire that can occur causes any property loss, and electric ice can be influenced in brownout
The normal operation of case, long-time brownout also result in the compressor winding scaling loss of refrigerator, influence refrigerator normal work
While be also easy to cause the accident.
Invention content
The purpose of the present invention is to provide a kind of refrigerator high-low pressure protective devices, can be when too low or too high for voltage certainly
Dynamic circuit breaker opens the power supply of refrigerator, and the automatic recovery of power supply after voltage recovery, ensures that refrigerator is run with security and stability.
To achieve the above object, the present invention adopts the following technical scheme that：
A kind of refrigerator high-low pressure protective device, including power supply and control device, the power supply include transformer and and transformer
Connected current rectifying and wave filtering circuit, current rectifying and wave filtering circuit include first capacitance in parallel with the secondary side of transformer, transformer secondary
The other end on secondary side of the one end successively through first resistor and the second capacitance and transformer is grounded, another termination on the secondary side of transformer
Ground, the second capacitance both ends are parallel with second resistance, and second resistance is also connected with the anode of source of stable pressure, the minus earth of source of stable pressure,
The reference pole of source of stable pressure is grounded through 3rd resistor, and the reference pole of source of stable pressure is also connected through the 4th resistance with the anode of source of stable pressure, the
Four resistance are also connected with control device；
The control device includes the first operational amplifier and second operational amplifier, the normal phase input end of the first operational amplifier
It is connected with the sliding end of the first potentiometer, one end ground connection of the first potentiometer, the other end is connected with the 4th resistance, and the first operation is put
The big inverting input of device is connected with the normal phase input end of second operational amplifier, and the normal phase input end of second operational amplifier connects
A points are connect, the inverting input of second operational amplifier is connected with the sliding end of the second potentiometer, one end of the second potentiometer and the
One potentiometer is connected, the other end of the second potentiometer ground connection, and the output end of the first operational amplifier is successively through the 4th resistance and the
One diode is connected with the base stage of the first triode, and the output end of second operational amplifier is successively through the 5th resistance and the two or two pole
Pipe is connected with the base stage of the first triode, the emitter ground connection of the first operational amplifier, the collector warp of the first operational amplifier
The collector of third capacity earth, the first triode is also connected through the 6th resistance with the base stage of the second triode, the second triode
Emitter be connected with the anode of source of stable pressure through the 7th resistance, the emitter of the second triode is also connected with the secondary side of transformer,
Coil ground connection of the collector of second triode through relay, the coil both ends of relay are parallel with third diode D, relay
Normally-closed contact be connected with the power supply of refrigerator.
Preferably, the source of stable pressure uses TL431 controllable accurate source of stable pressure.
Preferably, first triode use NPN type triode, the second triode use PNP type triode, the one or two
Pole pipe and the second diode are all made of light emitting diode.
The present invention controls the break-make of the power supply of refrigerator by the way that control device is arranged on the power supply of refrigerator, works as voltage
The power supply that refrigerator can be disconnected when too high or too low in time prevents from damaging due to refrigerator caused by too low or too high for voltage；
When power is restored, need to pass through delay refrigerator could work once electrified, simultaneously as delay make again network voltage in short-term substantially
Degree fluctuation cannot be such that the power supply of refrigerator connects immediately, thus have good Anti-Jamming, additionally can avoid working as voltage
When near upper limit voltage or lower voltage limit, control device output level frequently changes caused by leading to relay frequent movement
Damage ensures that refrigerator is run with security and stability.
Description of the drawings
Fig. 1 is the circuit diagram of the present invention.
Specific implementation mode
Technical scheme of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described embodiment
Only section Example of the invention, instead of all the embodiments.Based on the embodiments of the present invention, the common skill in this field
Other all embodiments that art personnel are obtained without making creative work belong to the protection model of the present invention
It encloses.
As shown in Figure 1, a kind of refrigerator high-low pressure protective device of the present invention, including power supply and control device, electricity
Source include transformer T and with transformer T-phase even current rectifying and wave filtering circuit, current rectifying and wave filtering circuit include with the secondary side of transformer T simultaneously
First capacitance C1 of connection, transformer T it is secondary while one end secondary through first resistor R1 and the second capacitance C2 and transformer T successively while
Other end ground connection, the other end ground connection on the secondary side of transformer T, the second both ends capacitance C2 are parallel with second resistance R2, the first electricity
The common end for hindering R1 and second resistance R2 is A points, and A points are connected with the anode K of source of stable pressure IC1, in the present embodiment, source of stable pressure
IC1 uses TL431 controllable accurate source of stable pressure, and the cathode A ground connection of source of stable pressure IC1, the reference pole R of source of stable pressure IC1 is through 3rd resistor
R3 is grounded, and the reference pole R of source of stable pressure IC1 is also connected through the 4th resistance R4 with the anode K of source of stable pressure IC1, the 4th resistance R4 also with
Control device is connected.
Control device includes the first operational amplifier IC2 and second operational amplifier IC3, the first operational amplifier IC2's
Normal phase input end is connected with the sliding end of the first potentiometer RP1, one end ground connection of the first potentiometer RP1, the other end and the 4th electricity
R4 is hindered to be connected, the inverting input of the first operational amplifier IC2 is connected with the normal phase input end of second operational amplifier IC3, the
The normal phase input end of two operational amplifier IC3 connects A points, the inverting input of second operational amplifier IC3 and the second potentiometer
The sliding end of RP2 is connected, and one end of the second potentiometer RP2 is connected with the first potentiometer RP1, the other end of the second potentiometer RP2
Ground connection, the output end of the first operational amplifier IC2 is successively through the 4th resistance R4's and the first diode D1 and the first triode VT1
Base stage is connected, and the output end of second operational amplifier IC3 is successively through the 5th resistance R5 and the second diode D2 and the first triode
The base stage of VT1 is connected, and the emitter ground connection of the first operational amplifier VT1, the collector of the first operational amplifier VT1 is through third electricity
Holding C3 ground connection, the collector of the first triode VT1 is also connected through the 6th resistance R6 with the base stage of the second triode VT2, and the two or three
The emitter of pole pipe VT2 is connected through the 7th resistance R7 with the anode K of source of stable pressure IC1, the emitter of the second triode VT2 also with change
The secondary side of depressor T is connected, and coil ground connection of the collector through relay K of the second triode VT2, the coil both ends of relay K are simultaneously
It is associated with third diode D3, the normally-closed contact of relay K is connected with the power supply of refrigerator, in the present embodiment, the first triode
VT1 uses NPN type triode, the second triode VT2 to use PNP type triode, and the first diode D1 and the second diode D2 are equal
Using light emitting diode.
The present invention at work, after the rectified filtering of voltage of transformer T, all the way through first resistor R1 and second resistance R2
Partial pressure obtains sampled voltage, but since the time constant of first resistor R1 and the second capacitance C2 are very big, the voltage of A points slowly rises
Height, when lower voltage limit of the voltage of A points less than second operational amplifier IC3 settings, second operational amplifier IC3 outputs are height
Level, the second diode D2 are lighted, and the first triode VT1 conductings, another way voltage makes relay K's through the second triode VT2
Coil obtains electric, the normally-closed contact disconnection of relay K, refrigerator power-off；When the second triode VT2 conductings, third capacitance C3 passes through
Second triode VT2 forms secondary delay to the 6th resistance R6 chargings；When A point voltages reach under the first operational amplifier IC2
When voltage limit, the first operational amplifier IC2 exports high level, and the first diode D1 is lighted, the first triode VT1 and the two or three pole
The coil of pipe VT2 conductings, relay K obtains electric, refrigerator power-off；Only when the voltage of A points be located at the first operational amplifier IC2 and
Refrigerator just works normally within the scope of the voltage limit up and down of second operational amplifier IC3.When power system restoration is powered, need to through and prolonging
When refrigerator could work once electrified, simultaneously as delay again make fluctuating widely in short-term for network voltage that cannot make relay immediately
Device K is connected, thus has good Anti-Jamming, additionally can avoid being near upper limit voltage or lower voltage limit when A points
When, frequently variation causes relay frequent movement to cause for the first operational amplifier IC2 and second operational amplifier IC3 output levels
Damage, ensure refrigerator run with security and stability.
Claims (3)
1. a kind of refrigerator high-low pressure protective device, it is characterised in that：Including power supply and control device, the power supply includes transformation
Device and the current rectifying and wave filtering circuit being connected with transformer, current rectifying and wave filtering circuit include first capacitance in parallel with the secondary side of transformer,
The other end on secondary side of the one end of transformer secondary successively through first resistor and the second capacitance and transformer is grounded, the pair of transformer
The other end on side is grounded, and the second capacitance both ends are parallel with second resistance, and second resistance is also connected with the anode of source of stable pressure, source of stable pressure
Minus earth, the reference pole of source of stable pressure is grounded through 3rd resistor, and the reference pole of source of stable pressure is also through the 4th resistance and source of stable pressure
Anode is connected, and the 4th resistance is also connected with control device；
The control device includes the first operational amplifier and second operational amplifier, the normal phase input end of the first operational amplifier
It is connected with the sliding end of the first potentiometer, one end ground connection of the first potentiometer, the other end is connected with the 4th resistance, and the first operation is put
The big inverting input of device is connected with the normal phase input end of second operational amplifier, and the normal phase input end of second operational amplifier connects
A points are connect, the inverting input of second operational amplifier is connected with the sliding end of the second potentiometer, one end of the second potentiometer and the
One potentiometer is connected, the other end of the second potentiometer ground connection, and the output end of the first operational amplifier is successively through the 4th resistance and the
One diode is connected with the base stage of the first triode, and the output end of second operational amplifier is successively through the 5th resistance and the two or two pole
Pipe is connected with the base stage of the first triode, the emitter ground connection of the first operational amplifier, the collector warp of the first operational amplifier
The collector of third capacity earth, the first triode is also connected through the 6th resistance with the base stage of the second triode, the second triode
Emitter be connected with the anode of source of stable pressure through the 7th resistance, the emitter of the second triode is also connected with the secondary side of transformer,
Coil ground connection of the collector of second triode through relay, the coil both ends of relay are parallel with third diode D, relay
Normally-closed contact be connected with the power supply of refrigerator.
2. a kind of refrigerator high-low pressure protective device as described in claim 1, it is characterised in that：The source of stable pressure uses
TL431 controllable accurate source of stable pressure.
3. a kind of refrigerator high-low pressure protective device as claimed in claim 2, it is characterised in that：First triode uses
NPN type triode, the second triode use PNP type triode, and the first diode and the second diode are all made of light emitting diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711478410.7A CN108281937A (en) | 2017-12-29 | 2017-12-29 | A kind of refrigerator high-low pressure protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711478410.7A CN108281937A (en) | 2017-12-29 | 2017-12-29 | A kind of refrigerator high-low pressure protective device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108281937A true CN108281937A (en) | 2018-07-13 |
Family
ID=62802856
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711478410.7A Withdrawn CN108281937A (en) | 2017-12-29 | 2017-12-29 | A kind of refrigerator high-low pressure protective device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108281937A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204464974U (en) * | 2015-02-09 | 2015-07-08 | 安徽长龙电气集团有限公司 | A kind of power distribution cabinet low-voltage circuit |
| CN205265229U (en) * | 2015-12-28 | 2016-05-25 | 北京创新纪技术开发有限公司 | Electrical load safety protection system |
| CN107256056A (en) * | 2017-07-05 | 2017-10-17 | 佛山杰致信息科技有限公司 | The low-voltage circuit of power distribution cabinet |
-
2017
- 2017-12-29 CN CN201711478410.7A patent/CN108281937A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204464974U (en) * | 2015-02-09 | 2015-07-08 | 安徽长龙电气集团有限公司 | A kind of power distribution cabinet low-voltage circuit |
| CN205265229U (en) * | 2015-12-28 | 2016-05-25 | 北京创新纪技术开发有限公司 | Electrical load safety protection system |
| CN107256056A (en) * | 2017-07-05 | 2017-10-17 | 佛山杰致信息科技有限公司 | The low-voltage circuit of power distribution cabinet |
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| 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 | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20180713 |
|
| WW01 | Invention patent application withdrawn after publication |