CN202150820U

CN202150820U - Energy-saving ptc starter

Info

Publication number: CN202150820U
Application number: CN201120165988U
Authority: CN
Inventors: 张焕金
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-05-23
Filing date: 2011-05-23
Publication date: 2012-02-22
Anticipated expiration: 2021-05-23

Abstract

The utility model provides a PTC (Positive Temperature Coefficient) starter. In the utility model, a large PTC chip having a comparatively large volume is connected to a bidirectional triode thyristor in series. One electrode of the large PTC chip connects with a T2 terminal of the bidirectional triode thyristor. The other electrode of the large PTC chip and a T1 terminal of the bidirectional triode thyristor are taken as an external terminal to connect to a starting loop of a circuit. At the same time, the utility model also includes a small PTC chip having a comparatively small volume. One electrode of the PTC chip is connected to the large PTC chip at the electrode taken as the external terminal. The other electrode of the small PTC chip is connected to a G terminal of a trigger electrode of the bidirectional triode thyristor. The volume of the small PTC chip is restricted between 4.4 mm3 to 20 mm3. an initial resistance value is restricted between 1.5k Omega to 5k Omega. After the circuit is started, only the small PTC generates remaining energy consumption. Since the small PTC has a small volume and has a low working temperature, the remaining energy consumption is low.

Description

Energy-conservation PTC starter

Affiliated technical field

The utility model relates to a kind of PTC starter that reduces power consumption, in particular for the starter of monopole asynchronous motor.

Background technology

At present, monopole asynchronous motor starter commonly used is semistor starter (being the PTC starter), shown in accompanying drawing 1; Its operation principle is the starting windings in series of PTC resistance and monophase machine; The starting initial stage, PTC was in the low resistance state, bigger electric current was arranged through starting winding to guarantee electric motor starting, and this bigger electric current makes its heating up through PTC simultaneously; Thereby make its resistance increase to very big value; To be reduced to very small value through the electric current of starting winding, this is small keep electric current will be always during the motor whole service through PTC keeping the state of its high temperature high value, and consume the part additional electric energy.Size and the corresponding temperature value of high value state that the watt level of this part additional electrical energy depends mainly on the PTC chip volume (are PTC operating temperature value; Normally 130～150 ℃), the volume that reduces the PTC chip helps to reduce additional energy consumption with reduction PTC operating temperature value.But,, can not the volume of PTC chip be reduced too much in order to satisfy the requirement of power of motor capacity.In addition, the words that PTC chip operating temperature value is too low will make prolong greatly the resetting time of motor outage back PTC starter, even when ambient temperature is higher, can not reset.

Summary of the invention

In order to solve the existing bigger problem of PTC starter energy consumption, the utility model provides a kind of energy-conservation PTC starter, and this kind PTC starter possesses the function and the advantage of existing PTC starter, and energy consumption reduces greatly simultaneously.

The utility model solves the technical scheme that its technical problem adopted: shown in accompanying drawing 2; The big PTC chip PTC1 that one volumes is bigger connects with a bidirectional triode thyristor Triac; The utmost point of PTC1 is connected with the T2 end of Triac; Another utmost point of PTC1 and the T1 of Triac end are connected to the starting winding loop of motor, and be as shown in Figure 3.Also have the less little PTC chip PTC2 of a volumes simultaneously, the utmost point of PTC2 is connected to the utmost point that PTC1 is connected with the electric motor starting winding loop, and another utmost point of PTC2 is connected to the trigger electrode G end of Triac.At the electric motor starting initial stage, the resistance of PTC2 is less, and its electric current that passes through can let bidirectional triode thyristor Triac triggering and conducting, PTC1 be in the state of energising fully basically.After PTC1 heating resistance increased, the voltage drop on it raise, and the voltage drop after this raises is applied on the PTC2 simultaneously; PTC2 heating and resistance are increased, cause reducing, when this electric current is reduced to can not trigger bidirectional triode thyristor Triac the time through the electric current of PTC2; Then Triac will turn-off; Electric current will no longer pass through PTC1, and PTC1 also just no longer produces energy consumption, have only this moment PTC2 producing remaining energy consumption.Because the volume of the volume ratio PTC1 chip of PTC2 chip is little a lot, and the operating temperature value is lower, the remaining energy consumption that therefore produces is very little.Consider that PTC1 also is applied on the PTC2 in the voltage drop that initial resistance produced at electric motor starting initial stage; If the volume of PTC2 chip is too little and initial resistance is too little; Then might, PTC1 chip resistance generate heat earlier and the resistance increase by the PTC2 chip before increasing; And turn-off bidirectional triode thyristor Triac, causes motor does not have the enough time to accomplish starting process.But; The volume of PTC2 chip increases will make its remaining energy consumption increase; The electric current of PTC1 can not reliable turn-off after also possibly causing electric motor starting to be accomplished, on the other hand, and the too big words of initial resistance of PTC2; The current effective value of starting initial stage through the electric motor starting winding will reduce, and make the starting performance variation of motor.Therefore, the volume of PTC2 chip will limit within the specific limits with initial resistance.The utility model with the volume defining of PTC2 chip greater than 4.4mm ³Extremely less than 20mm ²Between, the initial resistivity value in the time of 25 ℃ is limited between 1.5k Ω to the 5k Ω, and resistance value increases and is twice when temperature rises to certain value of 70～90 ℃.

Have the occasion of moving capacitor Cr at motor, excessive in order to prevent through the current changing rate of bidirectional triode thyristor Triac, improve reliability of products, need to increase the inductance coil L that suppresses current break.L and Triac are connected in series.

When producing in enormous quantities; The consistency that guarantees the employed The Trigger of Bidirectional Triode Thyristor sensitivity of the utility model is comparatively difficult; In order to address this problem, can connect shunt resistance R between the T1 end of Triac and the trigger electrode G end, be used to adjust the The Trigger of Bidirectional Triode Thyristor electric current.

The employed big PTC chip PTC2 of the utility model may be cracked when breaking down, and cause the consequence of the Elastic Contact electric pole short circuit contact of chip two sides.For fear of this kind consequence occurring, the mounting means of big PTC chip can adopt anti-short-circuit structure.Concrete measure is: with the both sides electrode surface F1 of PTC chip, Elastic Contact electrode P1, P2 that F2 the contacts layout that misplaces, the Elastic Contact electrode contact position that is to say the both sides electrode surface is not on same the straight line perpendicular to electrode surface.Each contact position of Elastic Contact electrode and PTC chip electrode face relative opposite side electrode surface position; All be to support with insulating material, the contact position of this Support Position D1 (perhaps D2) and the electrode P2 (perhaps P1) of relative another side is on same the straight line X1 perpendicular to electrode surface (perhaps X2).

The beneficial effect of the utility model is, can reduce the energy consumption of PTC starter greatly, and the component parameter that adopts selects rationally, negligible amounts, and reliable operation, cost is lower.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further specified.

Fig. 1 is to use the circuit theory diagrams of the monophase machine of prior art PTC starter.

is the starting winding terminal;

is the operation winding terminal, and

is common port.

Fig. 2 is the circuit theory diagrams of the utility model.

Fig. 3 is the connecting circuit figure of the utility model and motor.

Fig. 4 is a kind of preferred embodiment that is used to explain the utility model, is the anti-short-circuit structure that mounting means adopted of big PTC chip shown in the figure.

Embodiment

In Fig. 2, the big PTC chip PTC1 that a volumes is bigger connects with a bidirectional triode thyristor Triac, and the utmost point of PTC1 is connected with the T2 end of Triac, and another utmost point of PTC1 and the T1 of Triac end are connected to the starting winding loop of motor.Also have the less little PTC chip PTC2 of a volumes simultaneously, the utmost point of PTC2 is connected to the utmost point that PTC1 is connected with the electric motor starting winding loop, and another utmost point of PTC2 is connected to the trigger electrode G end of Triac.The volume defining of PTC2 is greater than 4.4mm ³Extremely less than 20mm ³Between, the initial resistivity value in the time of 25 ℃ is limited between 1.5k Ω to the 5k Ω, and resistance value increases and is twice when temperature rises to certain value of 70～90 ℃.

Have the occasion of moving capacitor Cr to motor, it is excessive to prevent through the current changing rate of bidirectional triode thyristor Triac to have increased the inductance coil L that suppresses current break, improves reliability of products.L and Triac are connected in series.

In order to adjust the trigger current of bidirectional triode thyristor Triac, be connected with resistance R between the T1 end of Triac and the trigger electrode G end.

In the utility model preferred embodiment shown in Figure 4; The mounting means of big PTC chip PTC2 has adopted anti-short-circuit structure; Specifically be; With the both sides electrode surface F1 of PTC chip, Elastic Contact electrode P1, P2 that F2 the contacts layout that misplaces, the Elastic Contact electrode contact position that is to say the both sides electrode surface is not on same the straight line perpendicular to PTC chip electrode face.Each contact position of Elastic Contact electrode and PTC chip electrode face relative opposite side electrode surface position; All be to support with insulating material, the Elastic Contact electrode contact position (X1 or X2) on same straight line of this Support Position (D1 or D2) and relative another side perpendicular to PTC chip electrode face.This structural design can avoid under the broken situation of PTC chip, taking place the consequence of the Elastic Contact electric pole short circuit contact of two sides on the one hand, applies extra shearing force can for again simultaneously the PTC chip.CASE is an insulation crust.

Claims

1. energy-conservation PTC starter; It is characterized in that: the big PTC chip that a volumes is bigger is connected with a bidirectional triode thyristor; A utmost point of big PTC chip is connected with the T2 end of bidirectional triode thyristor; Another utmost point of big PTC resistance and the T1 of bidirectional triode thyristor hold the start loop that is connected to circuit as external connection end, also have a volumes little PTC chip littler than big PTC chip simultaneously, and a utmost point of little PTC chip is connected to the utmost point of big PTC chip as external connection end; Another utmost point of little PTC chip is connected to The Trigger of Bidirectional Triode Thyristor utmost point G end, and the volume defining of little PTC chip is greater than 4.4mm ³Extremely less than 20mm ³Between, the initial resistivity value of little PTC chip in the time of 25 ℃ is limited between 1.5k Ω to the 5k Ω.

2. a kind of energy-conservation PTC starter according to claim 1 is characterized in that: big PTC chip with also connect after bidirectional triode thyristor is connected with an inductance coil.

3. a kind of energy-conservation PTC starter according to claim 1 is characterized in that: be connected with resistance between the T1 end of bidirectional triode thyristor and the trigger electrode G end.

4. a kind of energy-conservation PTC starter according to claim 1; It is characterized in that: on the product package assembly; The Elastic Contact malposition of electrode that contacts with the both sides electrode surface of big PTC chip is arranged; The Elastic Contact electrode contact position that is to say the both sides electrode surface is not on same the straight line perpendicular to electrode surface; Each contact position of Elastic Contact electrode and big PTC chip electrode face relative opposite side electrode surface position, all be to support with insulating material, the Elastic Contact electrode contact position of this Support Position and relative another side is on same the straight line perpendicular to electrode surface.