CN202495739U - Refrigerator undervoltage and instantaneous power-off protector - Google Patents
Refrigerator undervoltage and instantaneous power-off protector Download PDFInfo
- Publication number
- CN202495739U CN202495739U CN 201220050217 CN201220050217U CN202495739U CN 202495739 U CN202495739 U CN 202495739U CN 201220050217 CN201220050217 CN 201220050217 CN 201220050217 U CN201220050217 U CN 201220050217U CN 202495739 U CN202495739 U CN 202495739U
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- China
- Prior art keywords
- refrigerator
- electric capacity
- relay
- resistance
- voltage
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- Expired - Fee Related
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- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
The utility model discloses a refrigerator undervoltage and instantaneous power-off protector. The protector comprises a first resistor, a second resistor, a third resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a relay, a light-emitting diode, a diode, a voltage stabilizing tube, a refrigerator socket, a potentiometer, and an unijunction transistor. According to the utility model, the turn-on and turn-off of the refrigerator power is controlled through the unijunction transistor and the relay, the refrigerator power can be automatically cut off when the voltage of the refrigerator power is too low, and when the power supply to the refrigerator is restored after an instantaneous power-off, the unijunction transistor is used to control the delayed closing of the relay so as to achieve the aim of delayed starting protection. Above all, the protector of the utility model has an undervoltage and instantaneous power-off protection function, so that ensures that the refrigerator will not be damaged when the refrigerator power is in abnormal situations, so the service life of the refrigerator is prolonged.
Description
Technical field
The utility model relates to a kind of refrigerator attachment device, relates in particular to the under-voltage and instant cut-off protector of a kind of refrigerator.
Background technology
Along with China people growth in the living standard; Refrigerator has become household electrical appliance indispensable in the numerous residents' family life of China; Yet the drive motors of refrigerator is the ability operate as normal in certain voltage range, and supply power voltage is low excessively to be easy to cause winding coil to burn.Therefore, refrigerator damages easily or the life-span weak point is puzzlement people's a problem, traces it to its cause, and mains ripple, instant cut-off are that refrigerator damages the main cause that makes the lost of life.
Summary of the invention
The purpose of the utility model provides a kind of refrigerator under-voltage and instant cut-off protector with regard to being in order to address the above problem.
The utility model is realized above-mentioned purpose through following technical scheme:
The utility model comprises first resistance, second resistance, the 3rd resistance, first electric capacity, second electric capacity, the 3rd electric capacity, the 4th electric capacity, relay, light-emitting diode, diode, voltage-stabiliser tube, refrigerator socket, potentiometer and unijunction transistor; First end of said first resistance is connected with the live wire of said AC power, an end of relay normally closed switch and first end of said first electric capacity simultaneously; Second end of said first resistance is connected with first end of the positive pole of said diode, said second electric capacity and the negative pole of said voltage-stabiliser tube simultaneously; Second end of said second electric capacity is connected with second end of said first electric capacity; The negative pole of said diode is connected with first end of said relay normally open switch and first end of said the 3rd electric capacity simultaneously; Second end of the normal open switch of said relay is connected with first end of first base stage of said unijunction transistor, said potentiometer and first end of sliding end and said the 3rd resistance simultaneously; Second base stage of said unijunction transistor is connected with first end of said second resistance and first end of said relay simultaneously; The emitter of said unijunction transistor is connected with second end of said potentiometer and first end of said the 4th electric capacity simultaneously; Second end of said second resistance is connected with the positive pole of said light-emitting diode; Second end of said relay normally closed switch is connected with the hot terminal of said refrigerator socket, and the zero line terminals of said refrigerator socket are connected with second end of the other end of the positive pole of the zero line of said AC power, said voltage-stabiliser tube, second end of said the 3rd electric capacity, the negative pole of said light-emitting diode, said relay, said the 4th electric capacity and second end of said the 3rd resistance simultaneously.
The beneficial effect of the utility model is:
The utility model passes through the break-make of unipolar transistor and relay control refrigerator power, crosses when hanging down at refrigerator power and can cut off refrigerator power automatically; When behind the refrigerator instant cut-off, restoring electricity again, the timing closing of unipolar transistor control relay reaches the purpose that delayed startup is protected.To sum up, the utlity model has under-voltage and the instant cut-off defencive function, guaranteed that refrigerator is not damaged, and has prolonged the life-span when abnormal conditions appear in power supply.
Description of drawings
Accompanying drawing 1 is the circuit structure schematic diagram of the utility model.
Embodiment
Be described further below in conjunction with 1 pair of the utility model of accompanying drawing:
Shown in accompanying drawing 1: the utility model comprises first resistance R 1, second resistance R 2, the 3rd resistance R 3, first capacitor C 1, second capacitor C 2, the 3rd capacitor C 3, the 4th capacitor C 4, relay K, LED, diode VD, voltage-stabiliser tube DW, refrigerator socket CZ, potentiometer RP and unijunction transistor V; First end of first resistance R 1 is connected with the live wire of AC power, the end of relay K normally closed switch K1-2 and first end of first capacitor C 1 simultaneously; Second end of first resistance R 1 is connected with the positive pole of diode VD, first end of second capacitor C 2 and the negative pole of voltage-stabiliser tube DW simultaneously; Second end of second capacitor C 2 is connected with second end of first capacitor C 1; The negative pole of diode VD is connected with first end of relay K normal open switch K1-1 and first end of the 3rd capacitor C 3 simultaneously; Second end of the normal open switch K1-1 of relay K is connected with first base stage of unijunction transistor V, first end of potentiometer RP and first end of sliding end and the 3rd resistance R 3 simultaneously; Second base stage of unijunction transistor V is connected with first end of second resistance R 2 and first end of relay K simultaneously; The emitter of unijunction transistor V is connected with second end of potentiometer RP and first end of the 4th capacitor C 4 simultaneously; Second end of second resistance R 2 is connected with the positive pole of LED; Second end of relay K normally closed switch K1-2 is connected with the hot terminal of refrigerator socket CZ, and the zero line terminals of refrigerator socket CZ are connected with the zero line of AC power, the positive pole of voltage-stabiliser tube DW, second end of the 3rd capacitor C 3, the negative pole of LED, the other end of relay K, second end of the 4th capacitor C 4 and second end of the 3rd resistance R 3 simultaneously.
Shown in accompanying drawing 1: civil power 220V AC power is after first capacitor C 1 and 2 step-downs of second capacitor C, diode VD1 halfwave rectifier, 3 filtering of the 3rd capacitor C and voltage-stabiliser tube DW voltage stabilizing; Obtain galvanic current, 10～12V is provided operating voltage to time-delay, under-voltage protection device circuit.When the line voltage instant cut-off restores electricity again immediately, because of the emission of unijunction transistor VT very electronegative potential end, the relay K outage, refrigerator quits work.At this moment; Power supply charges to the 3rd capacitor C 3 through normally-closed contact K1-2, the potentiometer RP of relay K; Unijunction transistor VT conducting when treating that voltage on the 3rd capacitor C 3 rises to definite value; Relay K gets the electrician and does, the refrigerator energized, thus realized the delayed startup defencive function that instant cut-off restores electricity again.Reduce to 185V when following like line voltage.Voltage after step-down, rectification is far below 10V, and then the 3rd capacitor C 3 voltage deficiencies are so that unijunction transistor VT conducting work, and relay K is dead electricity and discharging just, cuts off the power supply of refrigerator, guarantees not operation work under low-voltage overburden situation of refrigerator.
Claims (1)
- A refrigerator under-voltage with the instant cut-off protector; It is characterized in that: comprise first resistance, second resistance, the 3rd resistance, first electric capacity, second electric capacity, the 3rd electric capacity, the 4th electric capacity, relay, light-emitting diode, diode, voltage-stabiliser tube, refrigerator socket, potentiometer and unijunction transistor; First end of said first resistance is connected with the live wire of said AC power, an end of relay normally closed switch and first end of said first electric capacity simultaneously; Second end of said first resistance is connected with first end of the positive pole of said diode, said second electric capacity and the negative pole of said voltage-stabiliser tube simultaneously; Second end of said second electric capacity is connected with second end of said first electric capacity; The negative pole of said diode is connected with first end of said relay normally open switch and first end of said the 3rd electric capacity simultaneously; Second end of the normal open switch of said relay is connected with first end of first base stage of said unijunction transistor, said potentiometer and first end of sliding end and said the 3rd resistance simultaneously; Second base stage of said unijunction transistor is connected with first end of said second resistance and first end of said relay simultaneously; The emitter of said unijunction transistor is connected with second end of said potentiometer and first end of said the 4th electric capacity simultaneously; Second end of said second resistance is connected with the positive pole of said light-emitting diode; Second end of said relay normally closed switch is connected with the hot terminal of said refrigerator socket, and the zero line terminals of said refrigerator socket are connected with second end of the other end of the positive pole of the zero line of said AC power, said voltage-stabiliser tube, second end of said the 3rd electric capacity, the negative pole of said light-emitting diode, said relay, said the 4th electric capacity and second end of said the 3rd resistance simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220050217 CN202495739U (en) | 2012-02-16 | 2012-02-16 | Refrigerator undervoltage and instantaneous power-off protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220050217 CN202495739U (en) | 2012-02-16 | 2012-02-16 | Refrigerator undervoltage and instantaneous power-off protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202495739U true CN202495739U (en) | 2012-10-17 |
Family
ID=47001951
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220050217 Expired - Fee Related CN202495739U (en) | 2012-02-16 | 2012-02-16 | Refrigerator undervoltage and instantaneous power-off protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202495739U (en) |
-
2012
- 2012-02-16 CN CN 201220050217 patent/CN202495739U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121017 Termination date: 20130216 |