CN201518411U - Novel overvoltage protector - Google Patents

Abstract

The utility model relates to a domestic appliance's protector equipment technical field refers in particular to a suitable domestic novel overvoltage protector. The overvoltage protector is provided with an insulating shell, an internal circuit board is installed in the insulating shell, and a fuse is connected to the internal circuit board in a conductive mode; the overvoltage protector is also provided with an input terminal which is connected with the internal circuit board in a conduction mode and penetrates out of the insulating shell, and an output terminal which is connected with the internal circuit board in a conduction mode, and the insulating shell is provided with a jack corresponding to the output terminal. Will during the use the utility model discloses an input terminal inserts the commercial power socket, with domestic appliance's plug insert the jack of overvoltage protector output can. When abnormal overvoltage occurs, the overvoltage detector of the overvoltage protector detects the overvoltage to conduct the overvoltage, the overvoltage is supplied to the electronic switch to start voltage, and the electronic switch is closed, so that current in a loop is increased sharply, the fuse is blown quickly, a power supply is cut off, and household appliances are effectively protected.

Description

A New Type Overvoltage Protector

Technical field:

The utility model relates to the technical field of protector equipment for household appliances, in particular to a novel overvoltage protector suitable for household use.

Background technique:

In household power grids, most of them are powered by a three-phase four-wire system. Often due to poor contact of the zero line of the distribution transformer, wrong connection between the zero line and the phase line, or accidental disconnection of the zero line, etc., the grid voltage is too high and thus Damage to household appliances; In addition, lightning strikes, surge voltage, etc. will also cause damage to household appliances. In order to avoid such damage, the overvoltage protection of household appliances is very important. Although most electronic and electrical products have such a protection design, they are not perfect or the protection is relatively single, and cannot achieve the proper protection effect. Although there are many similar electronic products, most of the structural designs are relatively complicated. And the cost is higher, not suitable for home use.

Utility model content:

The purpose of the utility model is to overcome the above-mentioned shortcomings of the existing products, and provide a new type of overvoltage protector with simple structure and small size.

The technical solution adopted by the utility model to achieve its purpose is: a new type of overvoltage protector, the overvoltage protector has an insulating shell, an internal circuit board is installed in the insulating shell, and the internal circuit board is connected with Fuse; the overvoltage protector is also provided with an input terminal connected to the internal circuit board and passing through the insulating shell, and an output terminal connected to the internal circuit board, and the insulating shell is set There are jacks corresponding to the output terminals.

Specifically, an overvoltage detector and an electronic switch are arranged on the internal circuit board.

The overvoltage detector is composed of a bidirectional trigger diode DIAC, a resistor, a diode and a capacitor; the electronic switch is a one-way thyristor SCR.

A status indicator light is also arranged on the internal circuit board.

After adopting the above structure, when in use, insert the input terminal of the overvoltage protector of the utility model into the mains socket, and insert the plug of the household appliance into the jack corresponding to the output terminal of the overvoltage protector. During normal use, the status indicator light is on; and when an abnormal overvoltage occurs, the overvoltage detector of the overvoltage protector detects the overvoltage and makes it conduct, and supplies the electronic switch with a starting voltage to close the electronic switch, thereby making the circuit The current increases sharply, and the fuse is quickly blown, thereby cutting off the power supply and protecting household appliances.

The utility model has the advantages of simple structure, small size, low cost, convenient installation and use, and can effectively protect household appliances.

Description of drawings:

Fig. 1 is a structural representation of the utility model;

Fig. 2 is the internal circuit diagram of the utility model;

Fig. 3 is a schematic circuit diagram of the utility model.

Detailed ways:

Below in conjunction with specific embodiment and accompanying drawing, the utility model is further described.

As shown in Figure 1, the overvoltage protector of the present utility model has an insulating shell 1, and an internal circuit board 2 is installed inside the insulating shell 1, and a fuse 3 is connected on the internal circuit board 2; the overvoltage protector also has An input terminal 41 connected to the internal circuit board 2 and passing through the insulating shell 1, and an output terminal 42 connected to the internal circuit board 2 are provided. The insulating shell 1 is provided with the The output terminal 42 corresponds to the jack 10 . The internal circuit board 2 is also provided with a status indicator light 23 .

Specifically, as shown in FIG. 2 and FIG. 3 , the internal circuit board 2 is provided with an overvoltage detector 21, an electronic switch 22 and a status indicator light 23; DIAC and resistors (211, 212), diode 213, and capacitor 214 are composed; the electronic switch 22 is a one-way thyristor SCR; the status indicator 23 is an LED lamp, which is connected in series with the resistor 231 to form an indicating circuit.

The working state of the utility model is as follows: the input end of the overvoltage protector is connected with the mains, and the output end is connected with the household appliances. As shown in FIG. 3 , the fuse 3 is located at the front end of the internal circuit, that is, the input voltage supplies power after passing through the fuse 3 . Resistor 211 and resistor 212 form a voltage divider circuit, and the voltage at point A in the figure is proportional to the input voltage. When the input voltage is normal, the voltage at point A is less than the conducting voltage of the bidirectional trigger diode DIAC of the overvoltage detector 21, that is, the bidirectional trigger diode DIAC is not conducting, and the one-way thyristor SCR cannot obtain the trigger voltage, that is, the electronic switch 22 is in the disconnected state, so the status indicator light 23 is on, that is, the overvoltage protector works normally; when the input voltage rises, the voltage at point A rises thereupon, and when the voltage at point A is greater than the conduction voltage of the bidirectional trigger diode DIAC, the bidirectional The trigger diode DIAC is turned on, so as to supply the trigger voltage of the one-way thyristor SCR, so that the one-way thyristor SCR is turned on, which is equivalent to the closing of the electronic switch 22, forming a loop, so that the current in the loop increases suddenly, and the fuse is quickly blown Device 3 cuts off the mains input, so it plays a role in protecting electrical products. And at this time, the LED indicator light 23 is off, prompting the user to replace the overvoltage protector.

Of course, the above descriptions are only preferred embodiments of the present utility model, and are not used to limit the scope of protection of the present utility model. All equivalent modifications or changes are made according to the structural principles of the present utility model, such as the number of input terminals and output terminals. , position changes, etc., all should be included in the protection scope of the present utility model.

Claims (4)

1. novel overvoltage protector, it is characterized in that: described overvoltage protector has an insulation crust (1), and internal circuit board (2) is installed in the described insulation crust (1), has connected fuse (3) on the described internal circuit board (2); Described overvoltage protector also is provided with the input terminal (41) that connects and be piercing in described insulation crust (1) with described internal circuit board (2); and the lead-out terminal (42) that connects with described internal circuit board (2), described insulation crust (1) is provided with the jack (10) corresponding with described lead-out terminal (42).

2. a kind of novel overvoltage protector according to claim 1 is characterized in that: described internal circuit board (2) is provided with overvoltage detector (21), electronic switch (22).

3. a kind of novel overvoltage protector according to claim 2 is characterized in that: described overvoltage detector (21) is made up of bidirectional trigger diode DIAC and resistance (211,212), diode (213), electric capacity (214); Described electronic switch (22) is unidirectional controllable silicon S CR.

4. a kind of novel overvoltage protector according to claim 1 and 2 is characterized in that: also be provided with status indicator lamp (23) on the described internal circuit board (2).

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