CN2187852Y - Composite overvoltage safe device - Google Patents
Composite overvoltage safe device Download PDFInfo
- Publication number
- CN2187852Y CN2187852Y CN 94211755 CN94211755U CN2187852Y CN 2187852 Y CN2187852 Y CN 2187852Y CN 94211755 CN94211755 CN 94211755 CN 94211755 U CN94211755 U CN 94211755U CN 2187852 Y CN2187852 Y CN 2187852Y
- Authority
- CN
- China
- Prior art keywords
- triode thyristor
- bidirectional triode
- voltage
- resistance
- piezo
- 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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- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model discloses an over-voltage protecting device, which is a composite over-voltage protecting device, and is suitable for the over-voltage protection of electric equipment. The over-voltage protecting device is composed of a bidirectional thyristor, a voltage-sensitive resistor, diodes and capacitors. When the power supply voltage rises owing to a certain reason, the protecting device can cut off the power supply in time to protect electric appliances.
Description
The utility model has related to the electrician, security personnel's device of electronic applications, specifically a kind of compound overvoltage protector.Be applicable to the overvoltage protection of household electrical appliance, electronic equipment.
Along with popularizing of electric equipment, overvoltage protection is more and more to cause people's attention.Number of patent application 93206520.1 once disclosed a kind of compound overvoltage protector.This protector is formed an independent protection element with a bidirectional triode thyristor, a piezo-resistance and a diode, plays the overvoltage protection effect in circuit.Simple in structure, practical.But this protector is not enough to pulse and the surge voltage interference free performance that produces in the circuit, and is unfavorable to protective circuit.
Be to release a kind of stable work in work, the compound overvoltage protector of strong anti-interference performance is to satisfy the needs of overvoltage protection order of the present utility model.
Design of the present utility model is to increase a filter capacitor to realize in the gate pole branch road of bidirectional triode thyristor.
Task of the present utility model is by a bidirectional triode thyristor and a piezo-resistance and a diode are fitted together, and sets up an electric capacity between (-) utmost point of diode and bidirectional triode thyristor anode (T1), and cooperate electric current to insure to finish.The utility model is with the gate pole (G) of a termination bidirectional triode thyristor of piezo-resistance, (-) utmost point of the other end and diode joins, (+) utmost point of diode connects the anode (T2) of bidirectional triode thyristor, and electric capacity is connected between diode (-) utmost point and the bidirectional triode thyristor anode (T1).The piezo-resistance that selected parameter is suitable makes it be in cut-off state under normal working voltage, does not have trigger current, and bidirectional triode thyristor ends, the power supply normal power supply.When supply voltage is elevated to the magnitude of voltage that needs protection, the piezo-resistance conducting, the bidirectional triode thyristor conducting that is triggered forms short circuit, and electrical appliance has been protected in the blowout current insurance.The pulse and the surge voltage that produce in the power supply are filtered by electric capacity, and the assurance overvoltage crowbar is worked reliably.
The specification that the utility model only need change piezo-resistance, diode, bidirectional triode thyristor, electric capacity just can be developed into the alternating current-direct current series of products of different through-current capacities, different overvoltage protection values.
The utility model can directly be welded on bidirectional triode thyristor, piezo-resistance, diode, electric capacity in the circuit of electrical appliance and use, and also can be packaged into the chip of bidirectional triode thyristor and diode, piezo-resistance an over-voltage protection element with insulating material and use.
Characteristics of the present utility model are overvoltage protector strong interference immunity, can be in circuit steady operation.
Embodiment of the present utility model is provided by following accompanying drawing:
Fig. 1 is the use principle figure of the utility model in circuit
Fig. 2 is a graphical diagram of the present utility model
Fig. 3 is external form figure of the present utility model
Is that diode, (3) are electric capacity for piezo-resistance, (4) for bidirectional triode thyristor, (5) as figure (1) for electric current insurance, (2).During use, electric current insurance (1) is serially connected in the power circuit, (+) utmost point of diode (2) connects the anode (T2) of bidirectional triode thyristor (4), (-) utmost point of diode (2) connects an end of piezo-resistance (3), the gate pole (G) of another termination bidirectional triode thyristor (4) of piezo-resistance (3).One terminating diode (-) utmost point of electric capacity (5), the anode (T1) of another termination bidirectional triode thyristor (4) of electric capacity (5), two anodes of bidirectional triode thyristor (4) are attempted by the load two ends.Be protection bidirectional triode thyristor (4), go up current-limiting resistance of serial connection at anode (T2).When supply voltage just often, piezo-resistance (3) is ended, and does not have trigger current.Pulse that produces in the circuit and surge voltage are disturbed and are filtered the power supply normal power supply by electric capacity (5).When raising for some reason, supply voltage reaches protection during magnitude of voltage, piezo-resistance (3) conducting, and bidirectional triode thyristor (4) conducting that is triggered forms short circuit, and electrical appliance has been protected in blowout current insurance (1).
Claims (1)
1, a kind of compound overvoltage protector, this protector contain electric current insurance (1), diode (2), piezo-resistance (3), bidirectional triode thyristor (4), electric capacity (5).It is characterized in that: diode (2) and the later branch road of piezo-resistance (3) series connection are connected in parallel between the gate pole (G) and anode T2 of bidirectional triode thyristor (4), one terminating diode (2) of electric capacity (5) and the tie point of piezo-resistance (3), the anode T1 of another termination bidirectional triode thyristor (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94211755 CN2187852Y (en) | 1994-05-07 | 1994-05-07 | Composite overvoltage safe device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94211755 CN2187852Y (en) | 1994-05-07 | 1994-05-07 | Composite overvoltage safe device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2187852Y true CN2187852Y (en) | 1995-01-18 |
Family
ID=33828790
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94211755 Expired - Fee Related CN2187852Y (en) | 1994-05-07 | 1994-05-07 | Composite overvoltage safe device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2187852Y (en) |
-
1994
- 1994-05-07 CN CN 94211755 patent/CN2187852Y/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 | ||
| C14 | Grant of patent or utility model | ||
| 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 |