CN2333111Y

CN2333111Y - Miniature leakage protector

Info

Publication number: CN2333111Y
Application number: CN 98215863
Authority: CN
Inventors: 张显华
Original assignee: Bao'an Shajing Wanfeng Baohua Electrical Products Factory
Current assignee: Bao'an Shajing Wanfeng Baohua Electrical Products Factory
Priority date: 1998-06-18
Filing date: 1998-06-18
Publication date: 1999-08-11
Anticipated expiration: 2008-06-18

Abstract

The utility model relates to a miniature leakage protector for domestic electric appliances. The miniature leakage protector comprises a breaker 20, a controlled silicon control circuit 30, a leakage induced circuit 40, a pins component 50, a power supply circuit 60 and a resetting component 70. Each electric appliance element is respectively loaded on a circuit board 90. When used, when leakage current between a live wire and a zero wire exceeds a predetermined value, the leakage induced circuit 40 can detect out, and can output a signal to the control circuit 30; then the breaker 20 is opened to prevent the whole line from continuing leaking. The utility model has the characteristics of small volume, reliable performance, convenient operation, low manufacture cost, etc.

Description

Miniature earth leakage protective device

The utility model relates to the power protector that a kind of household electrical appliance are used, and particularly relates to the very little miniature earth leakage protective device of a kind of volume.

At present, common earth leakage protective device volume is all bigger, though they have creepage protection function, it is not attractive in appearance that ubiquity profile, uses defectives such as inconvenience.In addition, they all can not use as plug.United States Patent (USP) 356066 discloses the less earth leakage protective device of a kind of volume; its profile as shown in Figure 1; it can play the effect of equivalent current supply plug; but because its electric elements are installed on the single face wiring board; and be provided with bridge rectifier, thereby its volume is still bigger, its overall dimension is: long L1 is 55.9mm; wide W1 is 49.5mm, and high H1 is 49.5mm.Because further reduced volume has certain technical difficulty, thereby, still do not have littler earth leakage protective device up to now and occur.

The purpose of this utility model is to provide a kind of volume littler, and dependable performance is easy to use, miniature earth leakage protective device cheap for manufacturing cost.

For achieving the above object; the utility model provides a kind of miniature earth leakage protective device; it comprises that the shell 10 that reset key 71 and feeler switch 83 are housed, a pair of inserted sheet 51 that stretches out reach the power line of being made up of live wire H and zero line N 100, is characterized in that it also comprises from shell:

A circuit breaker that links to each other with power line 20 is to switch on or off power supply and load;

The SCR control circuit 30 that can control a pair of normally closed switch;

The electric leakage sensor circuit 40 that can detect leakage current;

A pin assembly 50 that links to each other with power supply;

One is used for sustaining voltage stable power circuit 60 and one and is used to the reset assembly 70 that recovers to switch on;

Each electric elements is divided on the wiring board 90.

SCR control circuit 30 comprises coil 31, controllable silicon 32 and electric capacity 33, and coil 31 links to each other with live wire, and controllable silicon 32 links to each other with coil and electric leakage sensor circuit 40, and electric capacity 33 links to each other with controllable silicon.

Electric leakage sensor circuit 40 comprises a transformer 41 and the integrated circuit (IC) chip 42 that energy is handled electric leakage signal, and the input of integrated circuit (IC) chip links to each other with control circuit 30 with transformer respectively with output.

Pin assembly 50 comprises a pair of inserted sheet 51 and is attached thereto, can cooperatively interact with the fixed tabs 52 and the activity contact pin 53 of connecting and cutting off the electricity supply.

Power circuit 60 is made up of piezo-resistance 61 and dropping resistor 62, and piezo-resistance is connected on the power line, and dropping resistor then links to each other with coil 31 with integrated circuit (IC) chip 42.

Reset assembly 70 comprises the reset key 71 that is contained on the shell, elastic reset post 72 that links to each other with reset key and the linking arm 73 that links to each other with elastic reset post and activity contact pin 53.

The utility model also is provided with one and is used to test the whether test circuit 80 of operate as normal of earth leakage protective device, and it is made up of Test Switchboard 81, the current-limiting resistance 82 that is attached thereto and feeler switch 83.

Described wiring board 90 is divided into first 91 and second 92, and integrated circuit (IC) chip 42 is contained in first, and other electric elements then are contained in second.

The iron core of described transformer 41 is three sheet loop configuration, and live wire H, zero line N walk around iron core two circles respectively and constitute primary coil.

Described shell 10 is square, and its long L is 33～43mm, and wide W is 29.3～39.3mm, and high H is 21.7～31.7mm.

In use, when occurring electric leakage and leakage current above predetermined value, the electric leakage sensor circuit of miniature earth leakage protective device can be exported a signal and give control circuit, cuts off the electric current between load and power line automatically.

Compare with existing like product, overall dimension of the present utility model has only the earth leakage protective device of present minimum, has really realized the microminiaturization of earth leakage protective device.Simultaneously; the utility model is with simple, rationally, structural design has realized detection of electrical leakage, cut off the power supply, resets and function such as whether testing normal reliably; for Modern Family provides a kind of external form create an aesthetic feeling, easy to use, the earth leakage protective device of safe and reliable microminiaturization.In addition, it is simple to the utlity model has parts, is easy to produce characteristics such as low cost of manufacture.

Fig. 1 is existing small-sized earth leakage protective device profile schematic diagram.

Fig. 2 is the utility model profile schematic diagram.

Fig. 3 is the utility model exploded sketch.

Fig. 4 is the utility model side sectional view.

Fig. 5 is the utility model circuit theory diagrams.

The utility model is described in further detail below in conjunction with accompanying drawing and a preferred embodiment.

As shown in Figure 3, Figure 4, miniature earth leakage protective device comprises shell 10 and cased circuit breaker 20, SCR control circuit 30, electric leakage sensor circuit 40, pin assembly 50, power circuit 60 and reset assembly 70.

Shell 10 profiles as shown in Figure 2, it is made of cover 11 and bottom 12, both are screwed, and reset key 71 and feeler switch 83 are housed on the cover.One termination of power line 100 is gone in the shell, and the other end links to each other with load.

Circuit breaker 20 comprises a pair of normally closed switch SW1 and SW2, and it connects as shown in Figure 5, and normally closed switch SW1 and SW2 are contained in respectively on the live wire H and zero line N of power line.When electric leakage sensor circuit 40 has detected electric leakage, switch SW 1 and SW2 will open, and at this moment, only depress reset key, and switch just can be closed.

SCR control circuit 30 (see figure 5)s comprise coil 31, controllable silicon 32 and electric capacity 33, and coil 31 links to each other with live wire, can cut off electric current according to the signal of electric leakage sensor circuit 40.Controllable silicon 32 (SCR) links to each other with coil and electric leakage sensor circuit 40, and the controllable silicon that is adopted in this example is PO110DA, electric capacity 33 and controllable silicon 32 in parallel strobing.

Electric leakage sensor circuit 40 (see figure 5)s comprise a transformer 41 and the integrated circuit (IC) chip 42 that energy is handled electric leakage signal, and coupling capacitance 43, filter capacitor 44, time electric capacity 45 and feedback resistance 46 are housed between coil 31 and integrated circuit (IC) chip 42.This circuit can induce the leakage current between live wire, zero line, and exports a signal and remove to open circuit breaker 20 for control circuit 30.Above-mentioned transformer 41 comprises the secondary coil 412 of a sheet iron core 411 and multilayer winding, lamination is a shellring shape structure, live wire H, zero line N constitute primary coil around 411 liang of circles of iron core, one end of secondary coil 412 links to each other with 2 pin of integrated circuit (IC) chip 42 by coupling capacitance 43, and the other end links to each other with 4 pin of chip 42 with 3 pin of chip 42 and through filter capacitor 44.If the electric current between live wire, zero line changes, transformer 41 can generate a voltage and output to secondary coil 412, and signal is input to integrated circuit 42 after the coupling capacitance coupling, and filter capacitor can some unwanted clutters of elimination.Integrated circuit (IC) chip 42 is selected the commercially available prod for use, and model is RV4140.Feedback resistance 46 is connected between 4,1 pin of integrated circuit (IC)

chip

42, and 8 pin of chip 42 link to each other with feedback resistance 46 through time

electric capacity

45, and 6,7 pin of chip 42 and electric capacity 33 and controllable silicon 32 are in parallel.When the electric leakage situation took place, transformer 41 produced a signal, was exported by 7 pin after integrated circuit 42 is handled.

Pin assembly 50 as shown in Figure 3, it comprises a pair of inserted sheet 51, fixed tabs 52 and activity contact pin 53.Inserted sheet stretches out from bottom 12, become 90 ° or 180 ° with power line, in this example be 90 °, the end that inserted sheet is positioned at shell links to each other with fixed tabs 52, an activity contact pin 53 that contacts with it and be used then is equipped with in the fixed tabs bottom, on bottom 12, the movable end of activity contact pin can contact with fixed tabs or disconnect the other end of activity contact pin, to switch on or off power supply by a columnar projections 54 riveteds.

Power circuit 60 (see figure 5)s are made up of piezo-resistance 61 and dropping resistor 62, are used to 5 pin of integrated circuit (IC) chip 42 that AC power is provided.Piezo-resistance is connected on the power line, and stable to guarantee earth leakage protective device voltage, dropping resistor then links to each other with coil 31 with integrated circuit (IC) chip 42.

Reset assembly 70 is used for recovering energising as shown in Figure 3, Figure 4.It comprises reset key 71, elastic reset post 72 and linking arm 73, and reset key 71 is contained on the cover 11, and its underpart links to each other with elastic reset post 72, and elastic reset post then linking arm 73 links to each other, and linking arm then links to each other with activity contact pin.When depressing reset key 71, cause elastic reset post 72 to descending, make activity contact pin 53 and fixed tabs 52 separate through linking arm 73, the protector no current passes through.When unclamping reset key 71, circuit breaker 20 closures, protector recovery energising.

In order in time to know whether operate as normal of earth leakage protective device, the utility model also is provided with test circuit 80 (see figure 5)s, and it is made up of Test Switchboard 81, the current-limiting resistance 82 that is attached thereto and feeler switch 83.With feeler switch under the hand 83, it is just closed often to open Test Switchboard 81, and its push to test circuit produces the electric current of a similar electric leakage situation, is measured by electric leakage sensor circuit 40.

Each electric elements of the present utility model are divided in (see figure 3) on the wiring board 90, and this wiring board is divided into first 91 and second 92, and integrated circuit (IC) chip 42 is contained in first, and other electric elements then are contained in second.Wiring board 90 is screwed on holder.Double-sided wiring board can be installed more part, and can dwindle the volume of protector.

Reasonable structural design of the present utility model, comprise reduce electric elements, that electric elements are installed on two faces of wiring board is first-class, and the utility model general shape is dwindled greatly, preferred shell sizes is: the about 38mm of long L, the about 34.3mm of wide W, the about 26.7mm of high H.

Miniature earth leakage protective device in use, when leakage current between live wire, the zero line surpassed predetermined value, electric leakage sensor circuit 40 can detect, and exported a signal and give control circuit 30, opened circuit breaker 20 then, stoped whole circuit to continue electric leakage.

Claims

1, a kind of the miniature earth leakage protective device that electric leakage the time is cut off the electricity supply automatically can appear between live wire, zero line; it comprises the shell (10) that reset key (71) and feeler switch (83) are housed, a pair of inserted sheet (51) that stretches out and the power line of being made up of live wire H and zero line N (100) from shell; it is characterized in that it also comprises:

A circuit breaker that links to each other with power line (20) is to switch on or off power supply and load;

The SCR control circuit (30) that can control a pair of normally closed switch;

The electric leakage sensor circuit (40) that can detect leakage current;

A pin assembly (50) that links to each other with power supply;

One is used for sustaining voltage stable power circuit (60) and one and is used to the reset assembly (70) that recovers to switch on;

Each electric elements is divided on the wiring board (90).

2, miniature earth leakage protective device according to claim 1; it is characterized in that described SCR control circuit (30) comprises coil (31), controllable silicon (32) and electric capacity (33); coil (31) links to each other with live wire; controllable silicon (32) links to each other with coil and electric leakage sensor circuit (40), and electric capacity (33) links to each other with controllable silicon.

3, miniature earth leakage protective device according to claim 1; it is characterized in that described electric leakage sensor circuit (40) comprises a transformer (41) and the integrated circuit (IC) chip (42) that energy is handled electric leakage signal, the input of integrated circuit (IC) chip links to each other with control circuit (30) with transformer respectively with output.

4, miniature earth leakage protective device according to claim 1 is characterized in that described pin assembly (50) comprises a pair of inserted sheet (51) and is attached thereto, and can cooperatively interact with fixed tabs (52) and the activity contact pin (53) of connecting and cutting off the electricity supply.

5, miniature earth leakage protective device according to claim 1; it is characterized in that described power circuit (60) is made up of piezo-resistance (61) and dropping resistor (62); piezo-resistance is connected on the power line, and dropping resistor then links to each other with coil (31) with integrated circuit (IC) chip (42).

6, miniature earth leakage protective device according to claim 1; it is characterized in that described reset assembly (70) comprises the reset key (71) that is contained on the shell, elastic reset post (72) that links to each other with reset key and the linking arm (73) that links to each other with elastic reset post and activity contact pin (53).

7, miniature earth leakage protective device according to claim 1; it is characterized in that it also is provided with one and is used to test the whether test circuit (80) of operate as normal of earth leakage protective device, it is made up of Test Switchboard (81), the current-limiting resistance (82) that is attached thereto and feeler switch (83).

8, miniature earth leakage protective device according to claim 1 is characterized in that described wiring board (90) is divided into first (91) and second (92), and integrated circuit (IC) chip (42) is contained in first, and other electric elements then are contained in second.

9, miniature earth leakage protective device according to claim 1, the iron core that it is characterized in that described transformer (41) are three sheet loop configuration, and live wire H, zero line N walk around iron core two circles respectively and constitute primary coil.

10, miniature earth leakage protective device according to claim 1 is characterized in that described shell (10) is square, and its length is 33～43mm, and wide is 29.3～39.3mm, and height is 21.7～31.7mm.