CN201584761U - Overvoltage detection circuit - Google Patents
Overvoltage detection circuit Download PDFInfo
- Publication number
- CN201584761U CN201584761U CN2009202522161U CN200920252216U CN201584761U CN 201584761 U CN201584761 U CN 201584761U CN 2009202522161 U CN2009202522161 U CN 2009202522161U CN 200920252216 U CN200920252216 U CN 200920252216U CN 201584761 U CN201584761 U CN 201584761U
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- nand gate
- detection circuit
- output
- voltage
- relay
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Abstract
The utility model relates to an overvoltage detection circuit, which includes a voltage detection unit, a voltage signal transmission unit and an output unit, wherein the voltage detection unit comprises a detection resistor connected into the detection circuit, a divider resistor connected in parallel with the detection resistor, and an photoelectric coupler connected in series with the divider resistor; the voltage signal transmission unit comprises a NAND gate Schmidt trigger connected with an output terminal of the photoelectric coupler; and the output unit comprises a reversal-phase driver connected with an output terminal of the 4-NAND gate Schmidt trigger, a triode connected with an output terminal of the reversal-phase driver through a base electrode, and a relay connected with a collector electrode of the triode. The utility model has the characteristics of high stability, reliability and response speed, and sensitive action, and has the advantages of small voltage, convenient installation and very high cost performance.
Description
Technical field
The utility model belongs to the synchronous motor control field, especially a kind of overvoltage detection circuit.
Background technology
Advantages such as high-voltage synchronous motor is stable with its power factor height, running speed, slow-speed of revolution simplicity of design have a wide range of applications in the electric driving of high-tension high-power field.The ac-ac variable frequency speed regulation technology is widely used in the manufacturing machine of big capacity low-speed running such as rolling mill, mine hoist, replace traditional DC speed regulation and produced economic benefit significantly, iron and steel and coal industry adopt and promote this technology successively both at home and abroad.
But synchronous motor can be for various reasons in the process of operation, produce the overvoltage phenomenon at magnet exciting coil easily, if do not carry out corresponding processing timely, be easy to burn the elements such as controllable silicon of rectifying part, the The whole control loop is caused serious injury.Thus, detection and the protection for overvoltage is very necessary.
For preventing that magnet exciting coil from producing overvoltage, the hot protective relays that adopt are protected more in field circuit at present.Can cause that behind overtension electric current increases, the bimetallic sector-meeting in the hot protective relay is because the heat that big electric current is produced and flexural deformation drives the contact action and cuts off circuit.But traditional hot protective relay exists precision not high, stability, poor reliability, and the trouble of adjusting is installed loaded down with trivial details shortcoming.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art part, provide a kind of simple in structure, be active in one's movements, safe and reliable overvoltage detection circuit.
The purpose of this utility model is achieved in that
A kind of overvoltage detection circuit, it comprises voltage detection unit, voltage signal transmission unit and output unit, it is characterized in that:
1) voltage detection unit is by being connected in detection resistance in the testing circuit, constituting with the divider resistance that detects the resistance parallel connection, the photoelectrical coupler of connecting with divider resistance;
2) the voltage signal transmission unit is made of the NAND gate Schmidt trigger that is connected with photoelectric coupler output end;
3) output unit is the rp-drive that is connected by NAND gate Schmidt trigger output, the triode that is connected with the rp-drive output by ground level and the relay that is connected on the transistor collector constitute.
And described NAND gate Schmidt trigger is four NAND gate Schmidt triggers.
And described rp-drive is six reverse buffering/converters.
And, on relay, be parallel with a diode.
Advantage of the present utility model and good effect are:
1. the related overvoltage detection unit inter-stage of the utility model adopts the photoelectricity coupling, has avoided the electrical interference between voltage detection unit and the voltage transmission unit, and stabilization of equipment performance and reliability are improved significantly.
2. the utility model has adopted Schmidt's NAND gate circuit in signal of telecommunication transmission circuit, can improve the circuit antijamming capability effectively, has further increased the stability and the reliability of system.
3. the utility model is transferred to relay with the superpotential signal of telecommunication by electronic unit, makes its action, thus this overvoltage detection circuit to have response speed fast, the characteristics that action sensitivity is high.
4. the used electronic devices and components of the utility model market is very easily bought, and can be integrated on the circuit board, and volume is small and exquisite, and is easy for installation, has high performance price ratio.
Description of drawings
Fig. 1 is a circuit diagram of the present utility model.
Embodiment
Be described in detail embodiment of the present utility model below in conjunction with accompanying drawing; Need to prove that present embodiment is narrative, is not determinate, can not limit protection range of the present utility model with this.
A kind of overvoltage detection circuit comprises voltage detection unit, voltage signal transmission unit and output unit:
Voltage detection unit constitutes by detecting resistance, divider resistance and photoelectrical coupler.Wherein detecting resistance R 14 is connected in parallel in the testing circuit, be parallel with divider resistance R1～R10 at detection resistance two ends, divider resistance R1～R10 is connected in series, and is in series with a photoelectrical coupler V1 between R5 and R10, originally is that photoelectrical coupler adopts H11AA1 type photoelectrical coupler in the example.The power supply of photoelectrical coupler adopts the 15V direct current, and its output is divided into two-way, and wherein one the tunnel through resistance R 11 ground connection, and another road is connected with the voltage signal transmission unit.
The voltage signal transmission unit is made of the NAND gate Schmidt trigger.The 8th of four NAND gate Schmidt triggers are connected with the output of photoelectrical coupler with the 9th pin.The tenth pin of four NAND gate Schmidt triggers links to each other with first, second, the 5th, the 6th pin respectively.The 3rd of four NAND gate Schmidt triggers are connected with the 13 pin, and the 4th pin is connected with the 12 pin through resistance R 12.For preventing that negative level from appearring in the 4th pin, resistance R 12 a two ends diode V2 in parallel, this diode cathode is connected with the 4th pin, and the 12 pin links to each other with this diode cathode.Simultaneously, the 12 pin is through capacitor C 1 ground connection.In the present embodiment, four NAND gate Schmidt triggers adopt CD4093 type Schmidt NAND gate, and diode V2 adopts 1N4148 type diode.The 11 pin of four NAND gate Schmidt triggers is an output.
Output unit is to be made of rp-drive, triode and relay.Rp-drive employing six is buffering/converter oppositely, six oppositely the 3rd pin of buffering/converter be connected with the output of four NAND gate Schmidt triggers, six oppositely second pin of buffering/converter be output, it is connected with triode V5 ground level as electronic switch through resistance R 13.The collector electrode of this triode is connected with the coil of relay K 1, emitting stage ground connection.The relay coil other end is connected with the 24V power supply.In order to prevent that voltage fluctuation from making relay K 1 misoperation, a diode V3 in parallel on relay coil.In this moment example, six reverse reverse buffering/converters of buffering/converter using CD4049 type six, relay K 1 adopts G5V-1 SPCO type relay, and triode employing 2N3053 type triode is with relay coil diode connected in parallel employing 1N4002 type diode.
The course of work of overvoltage detection circuit is: under the situation of circuit operate as normal, the undertension that is carried in detection resistance R 14 two ends is with the conducting photoelectrical coupler; When circuit voltage is too high; the voltage that detects resistance R 14 two ends makes photoelectrical coupler work behind divider resistance; the voltage of 15V is added to the 8th, the 9th pin of four NAND gate Schmidt triggers through photoelectrical coupler; output to the ground level of triode V5 through four NAND gate Schmidt triggers, reverse driven; triode conducting, so relay coil energising conducting, the actuating of relay; the action of control related circuit realizes the protection of circuit.
Claims (4)
1. overvoltage detection circuit, it comprises voltage detection unit, voltage signal transmission unit and output unit, it is characterized in that:
1) voltage detection unit is by being connected in detection resistance in the testing circuit, constituting with the divider resistance that detects the resistance parallel connection, the photoelectrical coupler of connecting with divider resistance;
2) the voltage signal transmission unit is made of the NAND gate Schmidt trigger that is connected with photoelectric coupler output end;
3) output unit is the rp-drive that is connected by NAND gate Schmidt trigger output, the triode that is connected with the rp-drive output by ground level and the relay that is connected on the transistor collector constitute.
2. overvoltage detection circuit according to claim 1 is characterized in that: described NAND gate Schmidt trigger is four NAND gate Schmidt triggers.
3. overvoltage detection circuit according to claim 1 is characterized in that: described rp-drive is six reverse buffering/converters.
4. overvoltage detection circuit according to claim 1 is characterized in that: be parallel with a diode on relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202522161U CN201584761U (en) | 2009-12-29 | 2009-12-29 | Overvoltage detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202522161U CN201584761U (en) | 2009-12-29 | 2009-12-29 | Overvoltage detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201584761U true CN201584761U (en) | 2010-09-15 |
Family
ID=42726773
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202522161U Expired - Lifetime CN201584761U (en) | 2009-12-29 | 2009-12-29 | Overvoltage detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201584761U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108462156A (en) * | 2017-12-29 | 2018-08-28 | 河南北瑞电子科技有限公司 | A kind of over-pressure safety device |
| CN111122955A (en) * | 2018-10-31 | 2020-05-08 | 宁波方太厨具有限公司 | Overvoltage detection circuit applied to range hood |
-
2009
- 2009-12-29 CN CN2009202522161U patent/CN201584761U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108462156A (en) * | 2017-12-29 | 2018-08-28 | 河南北瑞电子科技有限公司 | A kind of over-pressure safety device |
| CN108462156B (en) * | 2017-12-29 | 2019-07-02 | 深圳供电局有限公司 | Overvoltage protection device |
| CN111122955A (en) * | 2018-10-31 | 2020-05-08 | 宁波方太厨具有限公司 | Overvoltage detection circuit applied to range hood |
| CN111122955B (en) * | 2018-10-31 | 2021-10-01 | 宁波方太厨具有限公司 | Overvoltage detection circuit applied to range hood |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100915 |