CN2558072Y - Overvoltage fuse - Google Patents
Overvoltage fuse Download PDFInfo
- Publication number
- CN2558072Y CN2558072Y CN 02220189 CN02220189U CN2558072Y CN 2558072 Y CN2558072 Y CN 2558072Y CN 02220189 CN02220189 CN 02220189 CN 02220189 U CN02220189 U CN 02220189U CN 2558072 Y CN2558072 Y CN 2558072Y
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- CN
- China
- Prior art keywords
- piezo
- resistance
- layer
- wire
- surface layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
Disclosed is an over-voltage fuse, comprising an input end lead wire (2), an output end lead wire (6) and a varistor (1). An insulated layer (4) is coated on one end of the upper surface layer (1-1) of the varistor (1). A conductive layer (3) is coated on the insulated layer (4). The left end of the conductive layer (3) is connected with the input end lead wire (2). A metal spring plate with upward elastic force is welded with the right end of the conductive layer (3). The other end of the metal spring plate (5) is welded with the upper surface layer (1-1) of the varistor (1). The other end of the upper surface layer (1-1) of the varistor (1) is connected with the output lead wire (6). The lower surface layer (1-2) of the varistor is connected with a public end lead wire 7. The utility model has simple circuit, less elements and low cost. The utility model is applicable to various power systems through adopting the varistors with different grades. The fuse time of the fuse is adjustable through adopting different solders.
Description
Technical field
The utility model relates to a kind of overvoltage fuse of power consumption equipment being realized overvoltage protection.
Background technology
When the voltage in the circuit surpasses rated voltage, can cause the components and parts in the circuit to damage, therefore, people have studied various overvoltage protection devices.A kind of overvoltage protecting device is disclosed as state patent CN2376685Y---the power protection module; it is assembled by bidirectional triode thyristor, diode, piezo-resistance, electric capacity and resistance; when supply voltage raise for some reason, this protection module can in time cut off emergency power supply protection electrical appliance.But it with present market on the same circuit complexity that exists of overvoltage protection device, components and parts are many, shortcomings such as cost height.
Summary of the invention
The purpose of this utility model provides the overvoltage fuse that a kind of circuit is simple, components and parts are few, cost is low.
The technical scheme that realizes above-mentioned purpose is: a kind of overvoltage fuse, comprise input lead-in wire, output lead-in wire and piezo-resistance, one end of the upper surface layer of piezo-resistance is coated with insulating barrier, surface of insulating layer is coated with conductive layer, the left end of this conductive layer is connected with the input lead-in wire, the right-hand member of conductive layer is welded with the metal spring sheet that elastic force makes progress, the other end of metal spring sheet and the welding of the upper surface layer of piezo-resistance, the other end of the upper surface layer of piezo-resistance is connected with the output lead-in wire, also is connected with the common port lead-in wire on the undersurface layer of piezo-resistance.
In the technique scheme, only adopt a piezo-resistance, and be aided with metal spring sheet, insulating barrier etc., thereby the components and parts that use seldom, greatly reduce cost, and circuit structure is also very simple.When voltage is excessive in the circuit, the piezo-resistance heating, the solder joint between the upper surface layer of metal spring sheet and piezo-resistance melts, because the elastic force that the metal spring sheet makes progress causes the metal spring sheet upwards to flick, cut off power supply, has realized overvoltage protection.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Embodiment
As shown in Figure 1, a kind of overvoltage fuse, comprise input lead-in wire 2, output lead-in wire 6 and Zinc-oxide piezoresistor 1, the end of the upper surface layer 1-1 of piezo-resistance 1 is coated with insulating barrier 4, insulating barrier 4 surface coverage have conductive layer 3, the left end of this conductive layer 3 is connected with input lead-in wire 2, the right-hand member of conductive layer 3 is welded with the metal spring sheet 5 that elastic force makes progress, the upper surface layer 1-1 welding of the other end of metal spring sheet 5 and piezo-resistance 1, the other end of the upper surface layer 1-1 of piezo-resistance 1 is connected with output lead-in wire 6, also is connected with common port lead-in wire 7 on the undersurface layer 1-2 of piezo-resistance 1.
Structure shown in Figure 1 can satisfy the needs of three-way connection.Sometimes for wiring needs, can also draw a lead-in wire again on the undersurface layer 1-1 of piezo-resistance 1, one supplies input, and one for output.
In order to guarantee through-current capability, the conductive layer 3 that covers insulating barrier 4 surfaces can adopt sheet metal.
The upper surface layer 1-1 of metal spring sheet 5 and piezo-resistance 1 welds employed scolder and preferably adopts eutectic solder.Like this, when overvoltage occurring for some reason, metal spring sheet 5 is in time flicked, cut off circuit, protection in time.Certainly, also can adopt ordinary solder, only the fusing time difference during overvoltage.
Because the upper and lower superficial layer of Zinc-oxide piezoresistor 1 generally is a silver conductive layer, and silver conductive layer does not possess very big through-current capability, for this reason can input go between 2 and the upper end of metal spring sheet 5 between add one section copper cash of weldering, between the lower end of metal spring sheet 5 and output lead-in wire 6, also add one section copper cash of weldering, make fuse possess certain through-current capability.
Operation principle of the present utility model is as follows: during the overvoltage fuse operate as normal, input voltage adds between input lead-in wire 2 and the common port lead-in wire 7, and load is connected between output lead-in wire 6 and the common port lead-in wire 7.Power supply is through input lead-in wire 2, conductive layer 3, metal spring sheet 5, output 6 powering loads that go between.
Too high and when surpassing rated voltage when supply voltage, because electric current sharply increases in the Zinc-oxide piezoresistor 1, cause piezo-resistance 1 heating, after certain time-delay, solder joint between the upper surface layer 1-1 of metal spring sheet 5 and piezo-resistance 1 melts, because the elastic force that metal spring sheet 5 makes progress causes metal spring sheet 5 upwards to flick, and has cut off power supply.The overvoltage multiple of the fusing time of this fuse and power supply is inversely proportional to, and shows as certain anti-time limit characteristic.
By selecting the piezo-resistance of different brackets for use, this fuse can be applied to different power-supply systems.By adopting different scolders, can adjust the fusing time of fuse.
Claims (3)
1, a kind of overvoltage fuse, comprise input lead-in wire (2), output lead-in wire (6) and piezo-resistance (1), it is characterized in that: an end of the upper surface layer (1-1) of piezo-resistance (1) is coated with insulating barrier (4), insulating barrier (4) surface coverage has conductive layer (3), the left end of this conductive layer (3) is connected with input lead-in wire (2), the right-hand member of conductive layer (3) is welded with the metal spring sheet (5) that elastic force makes progress, upper surface layer (1-1) welding of the other end of metal spring sheet (5) and piezo-resistance (1), the other end of the upper surface layer (1-1) of piezo-resistance (1) is connected with output lead-in wire (6), also is connected with common port lead-in wire (7) on the undersurface layer (1-2) of piezo-resistance (1).
2, overvoltage fuse according to claim 1 is characterized in that: the conductive layer (3) that covers insulating barrier (4) surface is a sheet metal.
3, overvoltage fuse according to claim 1 and 2 is characterized in that: metal spring sheet (5) is by upper surface layer (1-1) welding of eutectic solder and piezo-resistance (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02220189 CN2558072Y (en) | 2002-04-24 | 2002-04-24 | Overvoltage fuse |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02220189 CN2558072Y (en) | 2002-04-24 | 2002-04-24 | Overvoltage fuse |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2558072Y true CN2558072Y (en) | 2003-06-25 |
Family
ID=33698530
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02220189 Expired - Fee Related CN2558072Y (en) | 2002-04-24 | 2002-04-24 | Overvoltage fuse |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2558072Y (en) |
-
2002
- 2002-04-24 CN CN 02220189 patent/CN2558072Y/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 | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |