CN202111461U - Circuit device realizing load control by using leakage protector - Google Patents
Circuit device realizing load control by using leakage protector Download PDFInfo
- Publication number
- CN202111461U CN202111461U CN2011202425578U CN201120242557U CN202111461U CN 202111461 U CN202111461 U CN 202111461U CN 2011202425578 U CN2011202425578 U CN 2011202425578U CN 201120242557 U CN201120242557 U CN 201120242557U CN 202111461 U CN202111461 U CN 202111461U
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- protective device
- earth leakage
- leakage protective
- leakage protector
- circuit
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Abstract
The utility model relates to a circuit device realizing load control by using a leakage protector. The circuit device is characterized in comprising a circuit composed of an AC end for inputting an external voltage, the leakage protector, a load and a resistor. The end for inputting an external voltage is connected with the resistor and the upper end of the leakage protector, the other end of the resistor is connected with a control contact A, and the other end B of the control contact is connected with the lower end of the leakage protector. The lower two ends of the leakage protector are directly connected with the load. The circuit is simple, practical, reasonable in design, and high in cost performance, thus having good market application value.
Description
Technical field
The utility model relates to a kind of circuit that adopts earth leakage protective device to realize load control.The list that particularly suitable directly starts, threephase motor must be controlled.
Background technology
Existing most load control all is to adopt contactor to realize.Earth leakage protective device only as the earth leakage protective string in being connected on major loop.Because contactor is to adopt coil to produce electromagnetic force to drive the break-make that main contact is realized load.In operate as normal, coil is wanted the loss electric energy, and can produce work noise.Contactor is again main switch element at major loop simultaneously, and its price directly influences the cost performance of The whole control circuit.
Summary of the invention
In view of the deficiency of above-mentioned technology, the purpose of the utility model provides a kind of circuit arrangement that adopts earth leakage protective device to realize load control, utilizes the switch performance of earth leakage protective device, realizes the control to load.
The utility model adopts following scheme to realize: a kind of circuit arrangement that adopts earth leakage protective device to realize load control is characterized in that: comprise the interchange end of external voltage input, earth leakage protective device, the circuit that load and resistance constitute.One end of described external voltage input is connected with top one end of resistance and earth leakage protective device, and the other end of resistance links to each other with the contact A of control, and the other end B and the earth leakage protective device bottom other end of control contact join.Two ends, described earth leakage protective device bottom directly are connected with load.The utility model adopts earth leakage protective device through detecting resistance loop, utilizes the switch performance of earth leakage protective device, realizes the control to load.
The utility model circuit is simple, and is reasonable in design, and high cost performance is arranged, and application market is worth preferably.
Description of drawings
Fig. 1 is that the utility model circuit theory is shown block diagram.
Fig. 2 is the circuit theory diagrams of the utility model circuit embodiments.
Embodiment
Below in conjunction with accompanying drawing and examples of implementation the utility model is further specified.
As shown in Figure 1, a kind of circuit arrangement that adopts earth leakage protective device to realize load control is characterized in that: comprise the interchange end of external voltage input, earth leakage protective device, the circuit that load and resistance constitute.One end of described external voltage input is connected with top one end of resistance and earth leakage protective device, and the other end of resistance links to each other with the contact A of control, and the other end B and the earth leakage protective device bottom other end of control contact join.Two ends, described earth leakage protective device bottom directly are connected with load.
Fig. 2 is that the utility model is used for the directly single-phase motor of startup, and M represents motor, and RJ represents thermal relay, and Q represents earth leakage protective device, and R represents cement resistor.The normally open contact of thermal relay is connected in parallel on control point A, the B two ends.
Under the situation that electromotor overload or short circuit do not take place, the normally open contact of thermal relay RJ is leaving, control point A, and B breaks off, and the electric current in two lines that power supply comes all is equally big, in the opposite direction certainly at any time.Therefore the magnetic flux in the primary coil of earth leakage protective device fully disappears, and secondary coil is output not.Therefore earth leakage protective device does not have action.
Under the situation that electromotor overload or short circuit take place, the normally open contact of thermal relay RJ is closed, control point A; B connects, and in this time, the sense of current in two lines that power supply comes is opposite; Their size of current is no longer the same; Please with reference to Fig. 2, can know that the difference between current in two lines of power supply just equals to flow through this moment the size of current of cement resistor since earth leakage protective device operating current be 30mA.Therefore setting the electric current that situation following time that electromotor overload or short circuit take place flows through cement resistor R is 30mA, carries out calculation specifications with regard to choosing of cement resistor R below.
Can know with reference to Fig. 2 circuit diagram, cement resistor R voltage U=220V, so can get:
The value of choosing cement resistor is 6.8K.
The watt level of the cement resistor that can ask by following formula again:
The power of choosing cement resistor is the type of 10W.
So finally choose the parameter index of cement resistor be: resistance value is 6.8K, and power is 10W.
Please with reference to Fig. 2; When overload or short circuit take place in motor; Electric current will make when arriving certain value and be connected in parallel on control point A, and the normally open contact of the thermal relay at B two ends is closed, and the size of current difference in two lines that this time, power supply came just reaches 30mA; Earth leakage protective device will trip, and has reached the purpose of protection motor.
The above is merely the preferred embodiment of the utility model, and all equalizations of being done according to the utility model claim change and modify, and all should belong to the covering scope of the utility model.
Claims (3)
1. a circuit arrangement that adopts earth leakage protective device to realize load control is characterized in that: comprise the interchange end of external voltage input, earth leakage protective device, the circuit that load and resistance constitute
,One end of described external voltage input is connected with top one end of resistance and earth leakage protective device, and the other end of resistance links to each other with the contact A of control, and the other end B and the earth leakage protective device bottom other end of control contact join
,Two ends, described earth leakage protective device bottom directly are connected with load.
2. a kind of circuit arrangement that adopts earth leakage protective device to realize load control according to claim 1, it is characterized in that: what resistance was selected for use is cement resistor.
3. a kind of circuit arrangement that adopts earth leakage protective device to realize load control according to claim 2, it is characterized in that: the cement resistor value is 6.8K, 10W.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202425578U CN202111461U (en) | 2011-07-11 | 2011-07-11 | Circuit device realizing load control by using leakage protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202425578U CN202111461U (en) | 2011-07-11 | 2011-07-11 | Circuit device realizing load control by using leakage protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202111461U true CN202111461U (en) | 2012-01-11 |
Family
ID=45436910
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202425578U Expired - Fee Related CN202111461U (en) | 2011-07-11 | 2011-07-11 | Circuit device realizing load control by using leakage protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202111461U (en) |
-
2011
- 2011-07-11 CN CN2011202425578U patent/CN202111461U/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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120111 Termination date: 20140711 |
|
| EXPY | Termination of patent right or utility model |