CN2141614Y

CN2141614Y - Silicon controllable single-phase automatic power limiter

Info

Publication number: CN2141614Y
Application number: CN 92240120
Authority: CN
Inventors: 孙爱村
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-11-28
Filing date: 1992-11-28
Publication date: 1993-09-01
Anticipated expiration: 2002-11-28

Abstract

The utility model discloses a silicon controllable single-phase automatic power limiter which comprises a control circuit and a temperature sensitive sheet metal assembly. The utility model is characterized in that two controllable silicon are in opposite direction and are connected in parallel, and a neon bulb indicating lamp is connected with the two controllable silicon in parallel; after that the two controllable silicon and the neon bulb indicating lamp are connected with the fire wire or the zero wire of the power appliance in series. The two control electrodes of the two controllable silicon are respectively connected with the normally closed nodes of the microswitch, and the button is controlled by the bending deformation of the over current and over heating of temperature sensitive sheet metal assembly. The over current can automatically realize power cut, and the power supply can be automatically recovered after about one minute. The utility model has the advantages of no contact, high reliability, long service life, low cost and big power limiting range. In particular, the electric furnace which is used by stealth can be limited by the utility model. The silicon controllable single-phase automatic power limiter is widely suitable for countryside, school and resident building.

Description

Silicon controllable single-phase automatic power limiter

The utility model relates to quantitative electricity consumption electricity-limiter, the single-phase Automatic current-limiter of particularly a kind of controllable silicon.

For many years, the mechanical air switch generally is used for the electricity-limiter of quantitatively powering, and cuts off the power supply with regard to automatic trip in case electric current surpasses set quota, forces to stop electricity consumption.Its major defect is that structure is complicated, and cost is higher, and can not restore electricity by automatic closing after the tripping operation.Can retrieve the electronic type Automatic current-limiter in the patent documentation in recent years.For example, though it has overcome the above-mentioned shortcoming of mechanical air switch, there is other shortcoming in utility model patent " Controlled silicon current limiter " (number of patent application 88209087.9).The normal electric spark that takes place forms oxide layer between curved sheet metal of the first and the contact, the influence conduction; Even cisco unity malfunction; Its two be the scope of rationing the power supply generally below 150 watts, maximum is 500 watts, civilian electric furnace is generally all greater than 500 watts, rationing the power supply mainly is that electric furnace is used in restriction steathily; It three is to adopt bidirectional triode thyristor as the circuit main element, and its cost is still higher, not too is suitable for generally applying.

The purpose of this utility model just is to overcome the shortcoming and defect part of above-mentioned prior art, provides a kind of structure simpler, the single-phase electricity-limiter of controllable silicon more reliable, that the scope of rationing the power supply is bigger, cost is lower of working, and more helps large-scale popularization and uses.

Above-mentioned purpose of the present utility model is achieved through the following technical solutions.

This electricity-limiter comprises control circuit and thermometal chip module two large divisions, circuit part is by two controllable silicons, indicator light, sensitive switch and be connected lead, two mutual reverse parallel connections of controllable silicon wherein are connected in series in the live wire of electrical appliance or the zero line again and go.Two control of two silicon controlleds utmost point is connected with two normally closed nodes of normally closed type sensitive switch respectively.Indicator light is in parallel with controllable silicon.The thermometal chip module also is connected in series in the live wire of electrical appliance or the zero line and goes.

Above-mentioned thermometal chip module is by a block length copper sheet or other sheet metal bending four foldings, between folding and the folding pad upward mica sheet insulated, and be compacted into tabularly, fixedly be close to again on the sheet metal.

The copper sheet external part of above-mentioned thermometal chip module and sheet metal external part are fixedly mounted on respectively on the insulation board, and another termination of sheet metal is near the button of sensitive switch, and the position mixes up the back sensitive switch and also maintains static.

Above-mentioned sensitive switch can be selected the small-sized sensitive switch of KWX type normally closed type for use.

Above-mentioned indicator light is selected the high pressure neon bulb for use.

The utility model and prior art contrast because the thermometal chip module is a non-contact structure, no longer produce electric spark, so prolong useful life greatly; Because its scope of rationing the power supply is bigger, can limits and use various electric furnaces, so economize on electricity is more; Under the identical situation of rated current, two silicon controlled prices are 1/10th of bidirectional triode thyristors, and the structure of thermometal chip module is simpler, and it is easier to process, so cost reduces greatly.Occasions such as this electricity-limiter is particularly suitable in vast rural area, school, city dweller building are promoted.

Accompanying drawing 1 is circuit theory diagrams of the present utility model.Accompanying drawing 2 is structural representations of its thermometal chip module.

Details are as follows to embodiment of the present utility model in conjunction with the accompanying drawings:

Two one-way SCR VS in the accompanying drawing 1 ₁And VS ₂Reverse parallel connection is in parallel with neon bulb DZ more mutually, connects with thermometal chip module JR then.Controllable silicon VS ₁And VS ₂Two control utmost point G ₁And G ₂Be connected respectively to two normally closed node J of sensitive switch K ₁And J ₂On.During application it is concatenated in the live wire of electrical appliance W or the zero line and goes.

Among the thermometal chip module JR shown in the accompanying drawing 2,1 is the metal pleated sheet, and 2 is insulating concrete mica plate, and 3 is sheet metal, 4 is heat-resistant insulating layer, and 5 for binding hoop, and 6 install and fix screw for sheet metal, 7 for the thermometal sheet installs and fixes screw, and 8 is the insulating mounting plate, and 9 is microswitch push-button.

The operation principle of this electricity-limiter is: when the total current of electrical appliance W does not surpass limit value, and controllable silicon VS ₁And VS ₂With the alternate of single phase alternating current power supply positive-negative half-cycle alternate conduction with end, to electrical appliance W normal power supply, this moment, neon bulb indicator light DZ did not work.When the increasing of electrical appliance W power, when for example using electric furnace steathily, total current just surpasses limit value, metal pleated sheet 1 among the thermometal chip module JR is bent downwardly with regard to overheated, drive sheet metal 6 simultaneously also to bending, the button 9 of normally closed sensitive switch K just is depressed, and makes normally closed node J ₁And J ₂Disconnect controllable silicon VS ₁And VS ₂Control utmost point G ₁And G ₂Become off-state by mutual connection, make controllable silicon VS ₁And VS ₂All be in cut-off state, not conductings of positive-negative half-cycle, W stops power supply to electrical appliance, and this moment, neon bulb indicator light DZ was shinny.When automatic pressure was had no progeny about 1 minute, 1 cooling of metal pleated sheet is stretched and is resetted, and drives sheet metal and upwards resets, and the button of normally closed sensitive switch K is released return, two normally closed node J ₁And J ₂Connect controllable silicon VS ₁And VS ₂Control utmost point G ₁And G ₂Promptly be switched on, two controllable silicons recover the alternate conduction operating state again, to the electrical appliance automatic recovery of power supply.But, only stopped the electricity consumption of limiting the quantity of, could continue to guarantee normal power supply, otherwise also will force outage automatically.

Claims

1, the single-phase Automatic current-limiter of a kind of controllable silicon, comprise control circuit and thermometal chip module two large divisions, it is characterized in that circuit part is by two controllable silicons, indicator light, sensitive switch be connected lead and form, two mutual reverse parallel connections of controllable silicon wherein, be connected in series to again in the live wire of electrical appliance or the zero line and go, two control of two silicon controlleds utmost point is connected with two normally closed nodes of normally closed type sensitive switch respectively, indicator light is in parallel with controllable silicon, and the thermometal chip module also is connected in series in the live wire of electrical appliance or the zero line and goes.

2, the single-phase Automatic current-limiter of controllable silicon according to claim 1, it is characterized in that the thermometal chip module curves four foldings by a block length copper sheet or other sheet metal, between folding and the folding on the pad mica sheet insulated, and be compacted into tabularly, fixedly be close to again on the sheet metal.

3, the single-phase Automatic current-limiter of controllable silicon according to claim 1 and 2, the copper sheet external part and the sheet metal external part that it is characterized in that the thermometal chip module are fixedly mounted on the insulation board respectively, another termination of sheet metal is near the button of sensitive switch, and the position mixes up the back sensitive switch and also maintains static.

4, the single-phase Automatic current-limiter of controllable silicon according to claim 1 is characterized in that sensitive switch can select the small-sized sensitive switch of KWX type normally closed type for use.

5, the single-phase Automatic current-limiter of controllable silicon according to claim 1 is characterized in that sensitive switch selects the high pressure neon bulb for use.