CN206323127U - A kind of novel transformer industrial frequency withstand voltage current foldback circuit - Google Patents
A kind of novel transformer industrial frequency withstand voltage current foldback circuit Download PDFInfo
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- CN206323127U CN206323127U CN201621052383.8U CN201621052383U CN206323127U CN 206323127 U CN206323127 U CN 206323127U CN 201621052383 U CN201621052383 U CN 201621052383U CN 206323127 U CN206323127 U CN 206323127U
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Abstract
The utility model provides a kind of novel transformer industrial frequency withstand voltage current foldback circuit; belong to pressure-resistant current foldback circuit field, including resistance R1 ~ R9, diode D1 ~ D14, electric capacity C1 ~ C9, inductance L1, transformer TL1 ~ TL3, zener diode DB1, triode Q1 ~ Q3, protective tube F1 and transformer T1.Wherein, Q1, C4, C5, R3, R4, D8, R8 constitute current foldback circuit; when output stage short circuit or overload; voltage on resistance R2 can increase; trigger triode Q1 is turned on after D3, R3, R7, C8 integration partial pressure; turn on and play a protective role so that switching tube can not be triggered, C4 plays state holding in the protection circuit.
Description
Technical field
The utility model is related to pressure-resistant current foldback circuit field, is specifically to be related to a kind of novel transformer power frequency
Pressure-resistant current foldback circuit.
Background technology
Industrial frequency withstand voltage experiment is the general pilot project of power equipment, and it is a tolerance test project, passes through this
Mesh can examine the dielectric strength of power equipment.Process of the test is the power-frequency voltage for applying standard requirement on test item, and is held
Continue 60 second time, occurred without in process of the test and puncture flashover, that is, passed through detection, it is qualified to be determined as.Due to being tolerance examination
Test, if not enough, insulation breakdown or flashover just occurs in dielectric strength in process of the test.After insulation breakdown, testing transformer
Direct shorted to earth can be produced larger short circuit current flow by high pressure.If long-time short circuit can cause test product wound face to expand, even
Can destructive test equipment.In order to protect test product and equipment, it is necessary to install protective resistance additional, limiting short-circuit current, while configuring excessively stream
Protection circuit, hookup is cut off when being short-circuited.
Usual industrial frequency withstand voltage experiment protection circuit uses electric current relay as overcurrent protection original paper, but it has volume
Greatly, sensitivity is low, be not easy to regulation the shortcomings of, be increasingly not suitable with technology development need.Accordingly, it would be desirable to design a kind of structure
Simply, the strong protection circuit of pressure-resistant protective effect so that industrial frequency withstand voltage test measurement is more accurate.
Utility model content
To overcome above-mentioned deficiency, the utility model provides a kind of novel transformer industrial frequency withstand voltage overcurrent protection electricity
Road.
The utility model solves the above problems by the following technical programs：
A kind of novel transformer industrial frequency withstand voltage current foldback circuit, including resistance R1 ~ R9, diode D1 ~ D14, electric capacity C1 ~
C9, inductance L1, transformer TL1 ~ TL3, zener diode DB1, triode Q1 ~ Q3, protective tube F1 and transformer T1；
Described electric capacity C3 one end is in parallel with electric capacity C2 through inductance L1；One end of the electric capacity C3 and diode D10 negative pole
Connected with diode D9 positive pole；The positive pole of the other end of the electric capacity C3 and diode D12 negative pole and diode D11 connects
Connect；The negative pole of the electric capacity C1 is connected with diode D10, D12 positive pole, electric capacity C9 one end and triode Q1 emitter stages；The electricity
The positive pole for holding C1 is connected with diode D13 and resistance R4 one end；Described protective tube F1 one end connects with diode D9, D11 negative pole
Connect；The protective tube F1 other ends and diode D13 positive poles, diode D1, D7 negative pole, electric capacity C7 one end and triode Q2 current collections
Pole is connected；The resistance R4 other ends and diode D14, zener diode DB1 one end, triode Q1 colelctor electrodes and electric capacity C9 are another
One end is connected；The resistance R7 is in parallel with electric capacity C8, and one end is connected with triode Q1 base stage；The resistance R7 other ends with
Electric capacity C4 positive poles, the connection of resistance R1, R3 one end；The electric capacity C4 is in parallel with resistance R1, and one end is connected with resistance R2 one end；Institute
The resistance R3 other ends are stated to be connected with diode D3 negative poles；The resistance R2 and diode D3 positive poles, transformer TL2 one end, two poles
Pipe D2, D4, D8 positive pole, electric capacity C6 one end and the connection of triode Q3 emitter stages；The base stage of the triode Q3 and diode D4, electricity
Hinder R6 and the connection of the zener diode DB1 other ends；The triode Q3 colelctor electrodes and diode D2 negative poles, transformer TL1, TL3
One end, diode D1, D5 positive pole, triode Q2 emitter stages and the connection of diode D14 negative poles；The diode D8 and electric capacity C6 are another
One end, transformer T1 one end, electric capacity C7 one end and the connection of diode D7 positive poles；The transformer TL3 other ends and transformer T1
The other end is connected；The transistor base is connected with the resistance R5 other ends and diode D5 negative poles；The electric capacity C7 and diode
D7 is connected in parallel.
In such scheme, preferably electric capacity C1, C4 is electrochemical capacitor.
In such scheme, preferably protective tube F1 is the protective tube for the fast molten type that capacity is 800mA.
In such scheme, preferably resistance R1 thermistors.
Advantage of the present utility model is with effect：
1st, the both-end half-bridge that the utility model is made up of plus both triggers circuit R2, C4, D7, L2 C2, C3, T3, L3 from
Swash formula switch transformed circuit, wherein DB1 is a kind of bidirectional trigger diode, and trigger voltage is 30V;T-L1-3 is in small high frequency
Magnet ring (diameter 7mm × 29mm × 12mm), the enamel-covered wire coiling 48 of primary diameter 0.50mm specifications is enclosed, and inductance value is 9.5mH,
The secondary circle of enamel-covered wire coiling 5 with 30 diameter 0.23mm specifications is formed, and is insulated between primary and secondary with suitable nylon jacket, be can reach CE
Safety standard requirement；
2nd, the utility model constitutes current foldback circuit by Q1, C4, C5, R3, R4, D8, R8, when output stage short circuit or mistake
During load, the voltage on resistance R2 can be increased, and trigger triode Q1 is turned on after D3, R3, R7, C8 integration partial pressure, so that opening
Pass pipe, which can not be triggered, to be turned on and plays a protective role, and C4 plays state holding in the protection circuit；
3rd, C1, L1 constitute LC formula single armed wave filters, and hair filters the sharp cutting edge of a knife or a sword pulse of on-off circuit generation.L1 diameter 0.37mm
Specification enamel-covered wire circle of coiling 200 on the high frequency magnetic core of EE-20 patterns is formed.A reserved gap is needed between high frequency magnetic core, to prevent
Magnetic core saturation, the L1 inductance values after winding should be 6.9mH or so；
4th, D5, D6, D8, D9, C6, C7 have been the inverse peak voltage effects released and export transformer L3.
Brief description of the drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
The utility model is described in further detail with reference to embodiments.
A kind of novel transformer industrial frequency withstand voltage current foldback circuit, as shown in figure 1, including resistance R1 ~ R9, diode D1 ~
D14, electric capacity C1 ~ C9, inductance L1, transformer TL1 ~ TL3, zener diode DB1, triode Q1 ~ Q3, protective tube F1 and transformer
T1.The utility model constitutes current foldback circuit by Q1, C4, C5, R3, R4, D8, R8, when output stage short circuit or overload, electricity
Voltage on resistance R2 can be increased, and trigger triode Q1 is turned on after D3, R3, R7, C8 integration partial pressure, so that switching tube can not
It is triggered and turns on and play a protective role, C4 plays state holding in the protection circuit.
Described electric capacity C3 one end is in parallel with electric capacity C2 through inductance L1；One end of the electric capacity C3 and diode D10 negative pole
Connected with diode D9 positive pole；The positive pole of the other end of the electric capacity C3 and diode D12 negative pole and diode D11 connects
Connect；The negative pole of the electric capacity C1 is connected with diode D10, D12 positive pole, electric capacity C9 one end and triode Q1 emitter stages；The electricity
The positive pole for holding C1 is connected with diode D13 and resistance R4 one end；Described protective tube F1 one end connects with diode D9, D11 negative pole
Connect；The protective tube F1 other ends and diode D13 positive poles, diode D1, D7 negative pole, electric capacity C7 one end and triode Q2 current collections
Pole is connected；The resistance R4 other ends and diode D14, zener diode DB1 one end, triode Q1 colelctor electrodes and electric capacity C9 are another
One end is connected；The resistance R7 is in parallel with electric capacity C8, and one end is connected with triode Q1 base stage；The resistance R7 other ends with
Electric capacity C4 positive poles, the connection of resistance R1, R3 one end；The electric capacity C4 is in parallel with resistance R1, and one end is connected with resistance R2 one end；Institute
The resistance R3 other ends are stated to be connected with diode D3 negative poles；The resistance R2 and diode D3 positive poles, transformer TL2 one end, two poles
Pipe D2, D4, D8 positive pole, electric capacity C6 one end and the connection of triode Q3 emitter stages；The base stage of the triode Q3 and diode D4, electricity
Hinder R6 and the connection of the zener diode DB1 other ends；The triode Q3 colelctor electrodes and diode D2 negative poles, transformer TL1, TL3
One end, diode D1, D5 positive pole, triode Q2 emitter stages and the connection of diode D14 negative poles；The diode D8 and electric capacity C6 are another
One end, transformer T1 one end, electric capacity C7 one end and the connection of diode D7 positive poles；The transformer TL3 other ends and transformer T1
The other end is connected；The transistor base is connected with the resistance R5 other ends and diode D5 negative poles；The electric capacity C7 and diode
D7 is connected in parallel.
Described electric capacity C1, C4 are electrochemical capacitor.The protective tube F1 is the protective tube for the fast molten type that capacity is 800mA.
The resistance R1 thermistors.
The both-end half-bridge self-excitation that the utility model is made up of C2, C3, T3, L3 plus both triggers circuit R2, C4, D7, L2
Formula switch transformed circuit, wherein DB1 are a kind of bidirectional trigger diodes, and trigger voltage is 30V;T-L1-3 is in small high frequency magnetic
Ring (diameter 7mm × 29mm × 12mm), the enamel-covered wire coiling 48 of primary diameter 0.50mm specifications is enclosed, and inductance value is 9.5mH, secondary
Level is formed with the circle of enamel-covered wire coiling 5 of 30 diameter 0.23mm specifications, is insulated between primary and secondary with suitable nylon jacket, can reach CE peaces
Full standard requirement.C1, L1 constitute LC formula single armed wave filters, and hair filters the sharp cutting edge of a knife or a sword pulse of on-off circuit generation.L1 diameters
0.37mm specifications enamel-covered wire circle of coiling 200 on the high frequency magnetic core of EE-20 patterns is formed.A reserved gap is needed between high frequency magnetic core,
To prevent magnetic core saturation, the L1 inductance values after winding should be 6.9mH or so.Wherein, D5, D6, D8, D9, C6, C7 have been to release
Export transformer L3 inverse peak voltage effect.
The preferred embodiment that the utility model is created is illustrated above, but the utility model is not limited to
Embodiment, those of ordinary skill in the art can also make a variety of on the premise of without prejudice to the utility model creative spirit
Equivalent modification or replacement, these equivalent modifications or replacement are all contained in scope of the present application.
Claims (4)
1. a kind of novel transformer industrial frequency withstand voltage current foldback circuit, it is characterised in that:Including resistance R1 ~ R9, diode D1 ~
D14, electric capacity C1 ~ C9, inductance L1, transformer TL1 ~ TL3, zener diode DB1, triode Q1 ~ Q3, protective tube F1 and transformer
T1；Described electric capacity C3 one end is in parallel with electric capacity C2 through inductance L1；One end of the electric capacity C3 and diode D10 negative pole and two poles
Pipe D9 positive pole connection；The other end of the electric capacity C3 is connected with the positive pole of diode D12 negative pole and diode D11；It is described
Electric capacity C1 negative pole is connected with diode D10, D12 positive pole, electric capacity C9 one end and triode Q1 emitter stages；The electric capacity C1 is just
Pole is connected with diode D13 and resistance R4 one end；Described protective tube F1 one end is connected with diode D9, D11 negative pole；It is described to protect
The dangerous pipe F1 other ends are connected with diode D13 positive poles, diode D1, D7 negative pole, electric capacity C7 one end and triode Q2 colelctor electrodes；Institute
The resistance R4 other ends are stated to be connected with diode D14, zener diode DB1 one end, triode Q1 colelctor electrodes and the electric capacity C9 other ends；
The resistance R7 is in parallel with electric capacity C8, and one end is connected with triode Q1 base stage；The resistance R7 other ends and electric capacity C4 are just
Pole, the connection of resistance R1, R3 one end；The electric capacity C4 is in parallel with resistance R1, and one end is connected with resistance R2 one end；The resistance R3
The other end is connected with diode D3 negative poles；The resistance R2 and diode D3 positive poles, transformer TL2 one end, diode D2, D4,
D8 positive poles, electric capacity C6 one end and the connection of triode Q3 emitter stages；The base stage of the triode Q3 is with diode D4, resistance R6 and surely
Press the connection of the diode DB1 other ends；The triode Q3 colelctor electrodes and diode D2 negative poles, transformer TL1, TL3 one end, two poles
Pipe D1, D5 positive pole, triode Q2 emitter stages and the connection of diode D14 negative poles；The diode D8 and the electric capacity C6 other ends, transformation
Device T1 one end, electric capacity C7 one end and the connection of diode D7 positive poles；The transformer TL3 other ends connect with the transformer T1 other ends
Connect；The transistor base is connected with the resistance R5 other ends and diode D5 negative poles；The electric capacity C7 is in parallel with diode D7 even
Connect.
2. a kind of novel transformer industrial frequency withstand voltage current foldback circuit according to claim 1, it is characterised in that：The electricity
Hold C1, C4 and be electrochemical capacitor.
3. a kind of novel transformer industrial frequency withstand voltage current foldback circuit according to claim 1, it is characterised in that：It is described to protect
Dangerous pipe F1 is the protective tube for the fast molten type that capacity is 800mA.
4. a kind of novel transformer industrial frequency withstand voltage current foldback circuit according to claim 1, it is characterised in that：The electricity
Hinder R1 thermistors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621052383.8U CN206323127U (en) | 2016-09-13 | 2016-09-13 | A kind of novel transformer industrial frequency withstand voltage current foldback circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621052383.8U CN206323127U (en) | 2016-09-13 | 2016-09-13 | A kind of novel transformer industrial frequency withstand voltage current foldback circuit |
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| Publication Number | Publication Date |
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| CN206323127U true CN206323127U (en) | 2017-07-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201621052383.8U Active CN206323127U (en) | 2016-09-13 | 2016-09-13 | A kind of novel transformer industrial frequency withstand voltage current foldback circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108387829A (en) * | 2017-08-29 | 2018-08-10 | 苏州华电电气技术服务有限公司 | A kind of industrial frequency withstand voltage test device |
-
2016
- 2016-09-13 CN CN201621052383.8U patent/CN206323127U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108387829A (en) * | 2017-08-29 | 2018-08-10 | 苏州华电电气技术服务有限公司 | A kind of industrial frequency withstand voltage test device |
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