CN2629308Y - Electronic thermal relay - Google Patents
Electronic thermal relay Download PDFInfo
- Publication number
- CN2629308Y CN2629308Y CN 03263956 CN03263956U CN2629308Y CN 2629308 Y CN2629308 Y CN 2629308Y CN 03263956 CN03263956 CN 03263956 CN 03263956 U CN03263956 U CN 03263956U CN 2629308 Y CN2629308 Y CN 2629308Y
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- CN
- China
- Prior art keywords
- circuit
- relay
- phase
- microprocessor
- output
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- Expired - Fee Related
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- 229910052710 silicon Inorganic materials 0.000 claims abstract description 5
- 239000010703 silicon Substances 0.000 claims abstract description 5
- 238000006243 chemical reaction Methods 0.000 claims description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 4
- 230000000712 assembly Effects 0.000 claims description 4
- 238000000429 assembly Methods 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 abstract description 7
- 230000006870 function Effects 0.000 abstract description 4
- 238000005070 sampling Methods 0.000 abstract 4
- 230000002457 bidirectional effect Effects 0.000 abstract 1
- 238000005094 computer simulation Methods 0.000 abstract 1
- 239000003990 capacitor Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006399 behavior Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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- Protection Of Generators And Motors (AREA)
Abstract
An electronic heat relay is composed of a relay component and a circuit board component. The electronic circuit of the circuit board consists essentially of a sampling circuit, a micro-processor and an output circuit. The sampling circuit adopts three-phase precise current transformer sampling circuit; the micro-processor can complete the setup of the related data, and then compare the dynamic simulation quantity of the sampling circuit through a A/D transform, and also complete the stored memory of the variation quantity of the heating calorie in the operations. The output circuit is mainly an audion switch circuit, a relay and a bidirectional controllable silicon used to complete the operations. The control signal input of the output circuit is connected with the signal output of the micro-processor. The utility model has the functions of not only overloading and open-phase protection, but also current unbalance and heating memory protection, and has a good working performance.
Description
Affiliated technical field
The utility model relates to a kind of thermal relay.
Background technology
Existing thermal relay great majority are bimetal thermal relay, and it is to flow through heating wire on the bimetal leaf by the motor load electric current, and the heating of heating wire causes that bi-metal plate deformed comes drive actions mechanism, realizes the overload protection to motor.The deficiency of its existence is, power consumption is many, is prone to fault due to the heating, and service behaviour is relatively poor, do not satisfy to motor the phase failure, phase current is uneven and hot memory protect aspect functional requirement.
Summary of the invention
The purpose of this utility model provides a kind of electronic thermal relay, and it has the function of overload, the phase failure, phase current imbalance and the hot memory protect of motor.
The technical solution of the utility model is: the utility model is made up of relay construction spare and circuit board assemblies, be provided with electronic circuit on its circuit board assemblies, this electronic circuit mainly is by sample circuit, microprocessor and outlet circuit are formed, its sample circuit has adopted three-phase precise current transformer sample circuit to connect, the corresponding connection of three A/D conversion ports of its three-phase signal output and microprocessor, the outlet circuit has the switching circuit that triode is formed, the signal input end of this switching circuit is connected with microprocessor control signal output, the output of this switching circuit is connected with the coil of a relay, and the contact of this relay and a bipolar controllable silicon trigger electrode constitute the triggering loop.Through adopting such scheme; can realize the relevant parameter of motor overload, the phase failure, phase current is set by microprocessor; and will compare after by analog-to-digital conversion from the dynamic analog amount of sample circuit; and in starting, operation, overload and the turn off process of motor the heating heat the increase and decrease value store memory; afterwards with its output signal as control signal; send into the outlet circuit, finish the protection executable operations.
The utility model has the advantages that not only possess overload and phase failure protection function, and possess the uneven and hot memory protect function of phase current, favorable working performance.
Below in conjunction with accompanying drawing the utility model is further specified.
Description of drawings
Fig. 1 is the circuit connection diagram of the utility model sample circuit.
Fig. 2 is the utility model microprocessor circuit connection layout.
Fig. 3 is the circuit connection diagram of the utility model outlet circuit.
Embodiment
According to Fig. 1-Fig. 3, three-phase precise current transformer L4, L5, L6 obtain current signal from three phase mains A, B, C in the utility model sample circuit, become magnitude of voltage through resistance R 9, R10, R11, by rectifier bridge D7, D8, D9, inductance L 1, L2, L3, with capacitor C 12, C13, C14 and resistance R 6, R7, R8, export by A, B, C three ends behind the filter rectifications such as capacitor C 4, C6, C8.Microprocessor of the present utility model has adopted P87LPC767FD type single-chip microcomputer, its the 18th, 17,16 pin is that the A/D conversion port is connected with A, B, the C three-phase output end of sample circuit successively, its the 9th pin is a control signal output ends, this end is connected with the base loop of the triode Q1 of outlet in the circuit, formed switching circuit by triode Q1 and Q2, the collector output of triode Q2 is succeeded the coil of electrical equipment J1, and the trigger electrode of a contact of relay J 1 and bipolar controlled silicon Q3 is formed the triggering loop of Q3.When motor occurs that the thermal accumlation value transfinites in overload, the phase failure, phase current imbalance and the operation; by microprocessor the 9th pin control signal is sent to triode Q1 base stage; and by triode Q2 engage relay J1 coil, and controllable silicon Q3 is triggered, go to finish the protection operation.
Claims (2)
1。A kind of electronic thermal relay, form by relay construction spare and circuit board assemblies, this circuit board assemblies is provided with electronic circuit, it is characterized in that: described electronic circuit is mainly by sample circuit, microprocessor, and the outlet circuit is formed, its sample circuit has adopted three-phase precise current transformer sample circuit to connect, the corresponding connection of three A/D conversion ports of its three-phase signal output and microprocessor, the outlet circuit has the switching circuit that triode is formed, the signal input end of this switching circuit is connected with microprocessor control signal output, the output of this switching circuit is connected with the coil of a relay, and the contact of this relay and a bipolar silicon controlled trigger electrode constitute the triggering loop.
2。Electronic thermal relay according to claim 1, it is characterized in that: described microprocessor is a P87LPC767FD type single-chip microcomputer, its the 18th, 17,16 pin is that the A/D conversion port is connected with A, B, the C three-phase output end of sample circuit successively, its the 9th pin is a control signal output ends, and this end is connected with the base loop of the triode Q1 of outlet in the circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03263956 CN2629308Y (en) | 2003-06-01 | 2003-06-01 | Electronic thermal relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03263956 CN2629308Y (en) | 2003-06-01 | 2003-06-01 | Electronic thermal relay |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2629308Y true CN2629308Y (en) | 2004-07-28 |
Family
ID=34255893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03263956 Expired - Fee Related CN2629308Y (en) | 2003-06-01 | 2003-06-01 | Electronic thermal relay |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2629308Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103248002A (en) * | 2013-05-16 | 2013-08-14 | 天津市百利电气有限公司 | Electronic-type overload relay with reliable phase-failure protection function |
| CN107769171A (en) * | 2017-11-07 | 2018-03-06 | 辽宁易德实业集团有限公司 | A kind of self-powered type Intelligent current controller and its control method |
| CN113093608A (en) * | 2021-03-31 | 2021-07-09 | 东风商用车有限公司 | Microelectronic relay and whole vehicle control circuit |
-
2003
- 2003-06-01 CN CN 03263956 patent/CN2629308Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103248002A (en) * | 2013-05-16 | 2013-08-14 | 天津市百利电气有限公司 | Electronic-type overload relay with reliable phase-failure protection function |
| CN107769171A (en) * | 2017-11-07 | 2018-03-06 | 辽宁易德实业集团有限公司 | A kind of self-powered type Intelligent current controller and its control method |
| CN107769171B (en) * | 2017-11-07 | 2024-04-05 | 辽宁易德实业集团有限公司 | Self-powered intelligent current controller and control method thereof |
| CN113093608A (en) * | 2021-03-31 | 2021-07-09 | 东风商用车有限公司 | Microelectronic relay and whole vehicle control circuit |
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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: 20040728 Termination date: 20120601 |