CN202940562U - Under-voltage protection alarm device - Google Patents
Under-voltage protection alarm device Download PDFInfo
- Publication number
- CN202940562U CN202940562U CN 201220634645 CN201220634645U CN202940562U CN 202940562 U CN202940562 U CN 202940562U CN 201220634645 CN201220634645 CN 201220634645 CN 201220634645 U CN201220634645 U CN 201220634645U CN 202940562 U CN202940562 U CN 202940562U
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- voltage
- comparator
- relay
- triode
- resistance
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- Expired - Fee Related
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Abstract
The utility model relates to the technical field of under-voltage protection and provides under-voltage protection alarm device. The under-voltage protection alarm device comprises a micro-voltage diode D1, a comparator, a triode, a relay, a loudspeaker, an LED lamp, resistors R1-R4, a variable resistor Rp and a power supply U1. The R1 is connected with the variable resistor Rp in series to form a voltage-dividing structure to connect with two ends of the power supply U1. A variable output end of the variable resistor is connected with an out-phase input end of the comparator. The resistor R2 is connected with a voltage stabilizing diode in series to form a stable voltage-dividing structure. The resistor R2 and a connecting end of the voltage stabilizing diode are connected with an in-phase end of the comparator. The output end of the comparator is connected with a base electrode of the triode through the resistor R3. A collector electrode of the triode is connected with the power supply through the relay. A normally open contact of the relay connects the loudspeaker into a circuit, and a normally closed contact of the relay acts as a switch of an external load.
Description
Technical field
The utility model relates to the under-voltage protection technical field, and a kind of under-voltage protection warning device is provided.
Background technology
Under-voltage protection refers to electrical appliance when input voltage does not reach operating voltage, can cut off input voltage, effectively protects electrical appliance repeatedly not start because of low-voltage and causes damaging.After input voltage was normal, electrical appliance recovered normal operation automatically.
Summary of the invention
The purpose of this utility model is to provide a kind of circuit structure simple, under-voltage protection warning device with low cost.
The utility model is to achieve these goals by the following technical solutions:
a kind of under-voltage protection warning device, it is characterized in that: comprise minute-pressure diode D1, comparator, triode, relay, loud speaker, the LED lamp, resistance R 1-R4, variable resistance Rp, power supply U1, consist of partial-pressure structure after described R1 connects with variable resistance Rp and connect power supply U1 two ends, the variable output termination comparator out-phase input of variable resistance, consist of after resistance R 2 is connected with voltage stabilizing didoe and stablize partial-pressure structure, resistance R 2 is connected the in-phase input end of comparator with the link of voltage stabilizing didoe, the output of comparator connects the base stage of triode by resistance R 3, the collector electrode of triode connects power supply by relay, relay often start closed contact with the loud speaker place in circuit, the normally closed moving of relay leaves the contact as the switch of external load.
Because the utility model adopts above technical scheme, so the electronic device of whole device seldom, and circuit structure is simple, is easy to produce, and is with low cost.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
a kind of under-voltage protection warning device, it is characterized in that: comprise minute-pressure diode D1, comparator, triode, relay, loud speaker, the LED lamp, resistance R 1-R4, variable resistance Rp, power supply U1, consist of partial-pressure structure after described R1 connects with variable resistance Rp and connect power supply U1 two ends, the variable output termination comparator out-phase input of variable resistance, consist of after resistance R 2 is connected with voltage stabilizing didoe and stablize partial-pressure structure, resistance R 2 is connected the in-phase input end of comparator with the link of voltage stabilizing didoe, the output of comparator connects the base stage of triode by resistance R 3, the collector electrode of triode connects power supply by relay, relay often start closed contact with the loud speaker place in circuit, the normally closed moving of relay leaves the contact as the switch of external load.
Regulating Rp makes its resistance meet the demands.Owing to having used voltage stabilizing didoe in circuit, so the homophase input voltage of comparator is stable 6.2V.when operating circuit is operated in normal voltage 12V, this moment comparator reverse inter-input-ing voltage, the Rp both end voltage, should greater than 6.2V again by the comparator operation principle " when the homophase input voltage during lower than reverse inter-input-ing voltage comparator be output as the low level of working power " as can be known output voltage be 0V, not conducting of triode, warning circuit can not worked yet, lower voltage when operating circuit, drop to 11.5V when following, this moment comparator reverse inter-input-ing voltage, the Rp both end voltage should be lower than 6.2V again by the comparator operation principle " when the homophase input voltage during lower than reverse inter-input-ing voltage, comparator is output as the high level of working power ", the triode conducting, relay coil work, make original normally closed switch disconnect, normal open switch is closed, warning circuit work.
Claims (1)
1. under-voltage protection warning device, it is characterized in that: comprise minute-pressure diode D1, comparator, triode, relay, loud speaker, the LED lamp, resistance R 1-R4, variable resistance Rp, power supply U1, consist of partial-pressure structure after described R1 connects with variable resistance Rp and connect power supply U1 two ends, the variable output termination comparator out-phase input of variable resistance, consist of after resistance R 2 is connected with voltage stabilizing didoe and stablize partial-pressure structure, resistance R 2 is connected the in-phase input end of comparator with the link of voltage stabilizing didoe, the output of comparator connects the base stage of triode by resistance R 3, the collector electrode of triode connects power supply by relay, relay often start closed contact with the loud speaker place in circuit, the normally closed moving of relay leaves the contact as the switch of external load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220634645 CN202940562U (en) | 2012-11-27 | 2012-11-27 | Under-voltage protection alarm device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220634645 CN202940562U (en) | 2012-11-27 | 2012-11-27 | Under-voltage protection alarm device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202940562U true CN202940562U (en) | 2013-05-15 |
Family
ID=48324785
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220634645 Expired - Fee Related CN202940562U (en) | 2012-11-27 | 2012-11-27 | Under-voltage protection alarm device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202940562U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103836776A (en) * | 2014-03-28 | 2014-06-04 | 重庆大学 | Automatic reminding device for cleaning filter screen of air conditioner |
| CN104181381A (en) * | 2013-05-27 | 2014-12-03 | 深圳市海洋王照明工程有限公司 | Input undervoltage alarm circuit |
| CN104184112A (en) * | 2013-05-27 | 2014-12-03 | 深圳市海洋王照明工程有限公司 | Input under-voltage detection circuit |
| CN104780641A (en) * | 2014-01-10 | 2015-07-15 | 海洋王（东莞）照明科技有限公司 | Lighting drive circuit |
-
2012
- 2012-11-27 CN CN 201220634645 patent/CN202940562U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104181381A (en) * | 2013-05-27 | 2014-12-03 | 深圳市海洋王照明工程有限公司 | Input undervoltage alarm circuit |
| CN104184112A (en) * | 2013-05-27 | 2014-12-03 | 深圳市海洋王照明工程有限公司 | Input under-voltage detection circuit |
| CN104184112B (en) * | 2013-05-27 | 2017-11-21 | 深圳市海洋王照明工程有限公司 | A kind of input undervoltage detects circuit |
| CN104780641A (en) * | 2014-01-10 | 2015-07-15 | 海洋王（东莞）照明科技有限公司 | Lighting drive circuit |
| CN103836776A (en) * | 2014-03-28 | 2014-06-04 | 重庆大学 | Automatic reminding device for cleaning filter screen of air conditioner |
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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: 20130515 Termination date: 20131127 |