CN2141622Y - Contactless switch - Google Patents
Contactless switch Download PDFInfo
- Publication number
- CN2141622Y CN2141622Y CN 92236526 CN92236526U CN2141622Y CN 2141622 Y CN2141622 Y CN 2141622Y CN 92236526 CN92236526 CN 92236526 CN 92236526 U CN92236526 U CN 92236526U CN 2141622 Y CN2141622 Y CN 2141622Y
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- unit
- circuit
- phase
- voltage protection
- switch
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Abstract
The utility model relates to a contactless switch with an over-voltage protective circuit unit, belonging to the electronic switch. The main element of the contactless switch is a bidirectional thyristor electronic switch element, and the bidirectional thyristor electronic switch element is provided with a corresponding triggering circuit and an over-voltage protective circuit. The contactless switch can absorb the over voltage through the capacitance-resistance over-voltage protection action principle, and the contactless switch can efficiently ensure not to be influenced by the over voltage of the electric network and the back electromotive force of the motor winding. The contactless switch is especially suitable for matching with a microcomputer control system to ensure to realize the preset various accuracy requirements.
Description
The utility model belongs to electronic switching device, is a kind of noncontacting switch with overvoltage crowbar unit.
The switching device that cooperates the system controlled by computer motor to start and stop at present A.C. contactor commonly used or noncontacting switch; because the A.C. contactor control motor start-up or the time interval that stops to be grown (greater than 20ms); slow movement; often be difficult to satisfy practical application request; and the operate as normal that can influence microcomputer because of the noise that frequent folding caused and the interference signal of its contact; the noncontacting switch that adopts electronic switching device to form; though can solve the existing problem of A.C. contactor; but startup at the control motor; in the stopped process; owing to lack the corresponding protection measure; be subjected to the effect of motor winding back electromotive force and overvoltage of power supply; exist the poor stability of work, even by deficiencies such as scaling loss.
The purpose of this utility model is to provide a kind of noncontacting switch with protective circuit; this noncontacting switch is based on the bidirectional triode thyristor electronic switching device; configuration relative trigger circuit and excess voltage protection; by the silicon controlled conducting; by shortening motor start-up, dwell time at interval; and utilize each set protective circuit to eliminate the influence of the back electromotive force of instantaneous overvoltage of three-phase alternating-current supply and the generation of motor winding, to overcome the existing in prior technology deficiency.
Overall structure of the present utility model is:
Electronic switching circuit 3 is three bidirectional triode thyristor devices that are serially connected in respectively among the three-phase winding circuit of three-phase ac power cord A, B, C and motor M, and the control utmost point a of each silicon-controlled device, b, c are connected on relay contact switch k1, k2 in the circuits for triggering unit 1, the k3; Circuit unit 1 is with transformer T1; T2; T3 and be connected in T1; T2; full-wave rectifier in the T3 secondary winding is main formation; T1; T2; the elementary winding of T3 and three-phase ac power cord A; B; C is that " △ " shape connects; three load resistances of full-wave rectifier are potentiometer W1; W2; W3; the contact switch k1 of their sliding end and relay; k2; k3 connects; excess voltage protection 2; Unit 4 are overlapped on the electronic switching circuit list respectively not to be had in the three-phase ac power cord road of 3 both sides; they all comprise three branch roads, and each route resistance and capacitors in series constitute.
The architectural feature of each overvoltage crowbar unit is:
Each branch road of excess voltage protection unit 2,4 is connected to " Y " shape and three phase mains circuit overlap joint, and each branch road that is connected between two electrodes of each bidirectional triode thyristor is formed branch voltage protection circuit 6, and each branch road forms by resistance and capacitors in series.
4 sides near the motor winding also have excess voltage protection unit 5 and three phase mains circuit overlap joint in the protective circuit unit, and this circuit unit is made of the resistive device that is coupled to each other to " Y " shape.
Each resistive device that constitutes excess voltage protection unit 5 is an incandescent lamp.
Accompanying drawing of the present utility model is the circuit diagram of noncontacting switch.
Accompanying drawing has provided embodiment of the present utility model, further specifies as follows in conjunction with the accompanying drawings:
The system controlled by computer that this noncontacting switch the is applied to the mixed feed production and processing complete unit that feeds intake, facility is except that three-phase alternating-current motor is installed on batch bin among the figure, and all the other components and parts all are installed in the control cubicle.The folding of DZ144 type relay normally closed switch K1, K2, K3 is partly controlled by the measuring and calculating of TB805 microsystem.Transformer T1, T2 in the circuits for triggering unit 1, the elementary winding of T3 connect for " △ " shape with power supply three-phase firewire A, B, C, transformation ratio is 380/2 * 12 volt, and each secondary winding adopts two 1N4001 diodes and 470 Ω potentiometers to constitute full-wave rectifying circuit.By the trigger voltage of each potentiometer W1, W2, W3 output, add to control utmost point a, b, the c of three SCRKS bidirectional triode thyristors by relay switch K1, K2, K3.By three the silicon controlled conductings of control of the opening and closing of relay switch or end, and then finish to motor start-up and the control that stops, with the precision that guarantees to feed intake.
If instantaneous overvoltage appears in three-phase alternating-current supply in the running; remove by each branch road R1, C1 in the excess voltage protection unit 2; R2, C2; R3, C3 absorb outside the short circuit part; also by R4, C4; R5, C5, each branch road dividing potential drop of R6, C6 can guarantee that each reverse-blocking tetrode thyristor device can not be damaged owing to the instantaneous pressure of electrical network.
In addition; because the motor winding is an inductive load; understand in the frequent startup of motor, stop the higher back electromotive force of generation in the transfer process; for avoiding it to damage the bidirectional triode thyristor device; be overlapped on the overvoltage crowbar unit 4,5 in three bidirectional triode thyristor loads, the one side line road, will absorb this part overvoltage according to capacitance-resistance overvoltage protection action principle.The protective circuit unit 5 that constitutes by the white lamp of three 40W/220V, except that cooperating capacitor C7, C8, C9 that overvoltage is risen the damping action of resistance, or the Lamplight displayer of this noncontacting switch.
The obtained technological progress of the utility model is:
Because this noncontacting switch has disposed a plurality of capacitance-resistance excess voltage protections, can be effective Ground guarantees that the bidirectional triode thyristor device is not subjected to the impact of power network overvoltage and motor winding counter electromotive force, under the high power work condition, not only make contactless electronic beam switch that stronger job stability is arranged, and service life is longer, be specially adapted to and the Control System of Microcomputer configuration, with the various required precisions that guarantee that realization sets. The minimum torque of the motor of its control is 15 °, and in batching processing, once minimum inventory can be controlled in below the 0.1kg.
Claims (4)
1, a kind of noncontacting switch is coupled to each other the non-contact switch circuit that constitutes and relay configuration in the control cubicle of drive motors by circuits for triggering unit, electronic switching circuit unit and each protective circuit unit, it is characterized in that electronic switching circuit 3 is three bidirectional triode thyristor devices that are serially connected in respectively among the three-phase winding circuit of three-phase ac power cord A, B, C and motor M, the control utmost point a of each silicon-controlled device, b, c are connected on relay contact switch k1, k2 in the circuits for triggering unit 1, the k3; Circuit unit 1 is with transformer T1; T2; T3 and be connected in T1; T2; full-wave rectifier in the T3 secondary winding is main formation; T1; T2; the elementary winding of T3 and three-phase ac power cord A; B; C is that " △ " shape connects; three load resistances of full-wave rectifier are potentiometer W1; W2; W3; the contact switch k1 of their sliding end and relay; k2; k3 connects; excess voltage protection 2; Unit 4 are overlapped on respectively in the three-phase ac power cord road of 3 both sides, electronic switching circuit unit; they all comprise three branch roads, and each route resistance and capacitors in series constitute.
2, according to the noncontacting switch of claim 1; each branch road that it is characterized in that excess voltage protection unit 2,4 is connected to " Y " shape and three phase mains circuit overlap joint; each branch road that is connected between two electrodes of each bidirectional triode thyristor is formed branch voltage protection circuit 6, and each branch road forms by resistance and capacitors in series.
3, noncontacting switch according to claim 1 and 2; it is characterized in that 4 sides near the motor winding also have excess voltage protection unit 5 and three phase mains circuit overlap joint in the protective circuit unit, this circuit unit is made of the resistive device that is coupled to each other to " Y ".
4, noncontacting switch according to claim 3, each resistive device that it is characterized in that constituting excess voltage protection unit 5 is an incandescent lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92236526 CN2141622Y (en) | 1992-10-14 | 1992-10-14 | Contactless switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92236526 CN2141622Y (en) | 1992-10-14 | 1992-10-14 | Contactless switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2141622Y true CN2141622Y (en) | 1993-09-01 |
Family
ID=33778041
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92236526 Expired - Fee Related CN2141622Y (en) | 1992-10-14 | 1992-10-14 | Contactless switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2141622Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000002314A1 (en) * | 1998-07-02 | 2000-01-13 | Baoyun Yang | A contactless intellectual switch |
-
1992
- 1992-10-14 CN CN 92236526 patent/CN2141622Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000002314A1 (en) * | 1998-07-02 | 2000-01-13 | Baoyun Yang | A contactless intellectual switch |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |