CN201541121U - Bidirectional thyristor protection circuit - Google Patents
Bidirectional thyristor protection circuit Download PDFInfo
- Publication number
- CN201541121U CN201541121U CN2009202385944U CN200920238594U CN201541121U CN 201541121 U CN201541121 U CN 201541121U CN 2009202385944 U CN2009202385944 U CN 2009202385944U CN 200920238594 U CN200920238594 U CN 200920238594U CN 201541121 U CN201541121 U CN 201541121U
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- China
- Prior art keywords
- bidirectional triode
- triode thyristor
- bidirectional thyristor
- voltage
- resistance
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- 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
The utility model discloses a bidirectional thyristor protection circuit, which is characterized in that the bidirectional thyristor protection circuit comprises a bidirectional thyristor and a voltage dependent resistor connected with two anodes of the bidirectional thyristor in parallel; a parallel circuit composed of the bidirectional thyristor and the voltage dependent resistor is arranged at both ends of an AC live line and null line. The zinc oxide voltage dependent resistor is selected as the peak of the bidirectional thyristor to absorb the protection components, and connected with a double-anode of the bidirectional thyristor in parallel. Due to the bidirectional voltage-dependent characteristic, the voltage dependent resistor can clamp the peak voltage to the protected object (bidirectional thyristor), and absorb the over-voltage energy, whenever the voltage to the bidirectional thyristor is limited in the nominal voltage of the voltage dependent resistor, thus effectively and reliably protecting the bidirectional thyristor.
Description
Technical field
The utility model relates to a kind of protective circuit that is applied to the bidirectional triode thyristor in the AC network.
Background technology
At present, in AC network, it is the most frequently used function of bidirectional triode thyristor that the control of inductive load and switch are switched.Inductive load, as: motor, electromagnet, relay, solenoid etc. can produce self-induction inverse electromotive force and input voltage overlapped in series in the moment of switch, form the AC network crest voltage about about twice, put on the silicon controlled anode.During as voltage ripple of power network, thunder and lightning, surge peak value, can instantaneously surpass silicon controlled limit safety value, and cause the punch through damage of bidirectional triode thyristor.When so bidirectional triode thyristor is used in above field, all must be between double anode the additional absorption protective circuit.Relatively Chang Yong protection scheme is to adopt the capacitance-resistance series circuit, and still, the shortcoming of this scheme is that the absorption energy is little, and transient response speed is slow, and the coupling poor compatibility is difficult to guarantee being perfectly safe property of silicon controlled.
Summary of the invention
At above-mentioned defective of the prior art, the purpose of this utility model is to provide a kind of bidirectional triode thyristor protective circuit of utilizing the two-way pressure-sensitive character realization of piezo-resistance.
The technical scheme that the utility model adopted: a kind of protective circuit of bidirectional triode thyristor; it is characterized in that; comprise bidirectional triode thyristor; and with two piezo-resistances that anode tap is in parallel of this bidirectional triode thyristor, live wire, the zero line two ends of the parallel circuits incoming transport power supply that described bidirectional triode thyristor and piezo-resistance are formed.
Above-mentioned piezo-resistance is a Zinc-oxide piezoresistor.The clamped voltage of described piezo-resistance is 500V.
Two anode taps of above-mentioned bidirectional triode thyristor also are parallel with the capacitance-resistance series circuit of resistance and electric capacity composition.Described The Trigger of Bidirectional Triode Thyristor end is connected with control circuit by optical coupler.
The utility model is selected the peak absorbance protection component of Zinc-oxide piezoresistor as bidirectional triode thyristor for use; piezo-resistance is parallel on the double anode of bidirectional triode thyristor; utilize the two-way pressure-sensitive character of piezo-resistance; it is clamped that object of protection (bidirectional triode thyristor) is carried out crest voltage; absorb the overvoltage energy; the voltage that whenever can both make on the controllable silicon to be applied is no more than the nominal voltage value scope of piezo-resistance, protects the silicon controlled purpose effectively, reliably thereby reach.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with accompanying drawing concrete structure of the present utility model is further described.
As shown in Figure 1; the protective circuit of bidirectional triode thyristor described in the utility model (shown in frame of broken lines among the figure); comprise bidirectional triode thyristor U2; and with two piezo-resistance ZV2 that anode tap is in parallel of this bidirectional triode thyristor U2, the parallel circuits that described bidirectional triode thyristor U2 and piezo-resistance ZV2 form inserts live wire (AC-L), zero line (AC-N) two ends of the AC power of load.The two ends of described bidirectional triode thyristor U2 also are parallel with the capacitance-resistance series circuit of resistance R 28 and capacitor C 12 compositions, the trigger end of bidirectional triode thyristor U2 is connected with control circuit by optical coupler IC5, described control circuit is by the break-make of optical coupler IC5 control bidirectional triode thyristor U2, and the further AC power conducting or the shutoff of control load.
The utility model utilizes the two-way pressure-sensitive character of Zinc-oxide piezoresistor (5D471), and the peak-inverse voltage on the bidirectional triode thyristor U2 double anode is clamped in 500V, thereby prevents the damage of device over-voltage breakdown reliably.
Claims (5)
1. the protective circuit of a bidirectional triode thyristor; it is characterized in that; comprise bidirectional triode thyristor, and with two piezo-resistances that anode tap is in parallel of this bidirectional triode thyristor, live wire, the zero line two ends of the parallel circuits incoming transport power supply that described bidirectional triode thyristor and piezo-resistance are formed.
2. according to the protective circuit of the described bidirectional triode thyristor of claim 1, it is characterized in that described piezo-resistance is a Zinc-oxide piezoresistor.
3. according to the protective circuit of claim 1 or 2 described bidirectional triode thyristors, it is characterized in that the clamped voltage of described piezo-resistance is 500V.
4. according to the protective circuit of the described bidirectional triode thyristor of claim 1, it is characterized in that two anode taps of described bidirectional triode thyristor also are parallel with the capacitance-resistance series circuit of resistance and electric capacity composition.
5. according to the protective circuit of the described bidirectional triode thyristor of claim 1, it is characterized in that described The Trigger of Bidirectional Triode Thyristor end is connected with control circuit by optical coupler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202385944U CN201541121U (en) | 2009-11-06 | 2009-11-06 | Bidirectional thyristor protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202385944U CN201541121U (en) | 2009-11-06 | 2009-11-06 | Bidirectional thyristor protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201541121U true CN201541121U (en) | 2010-08-04 |
Family
ID=42592578
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202385944U Expired - Fee Related CN201541121U (en) | 2009-11-06 | 2009-11-06 | Bidirectional thyristor protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201541121U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105071370A (en) * | 2015-07-21 | 2015-11-18 | 重庆市亚东亚集团变压器有限公司 | Quick self-triggering damping resistor protection device |
-
2009
- 2009-11-06 CN CN2009202385944U patent/CN201541121U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105071370A (en) * | 2015-07-21 | 2015-11-18 | 重庆市亚东亚集团变压器有限公司 | Quick self-triggering damping resistor protection device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100804 Termination date: 20131106 |