CN209150709U - A kind of current transformer load open circuit protection circuit - Google Patents
A kind of current transformer load open circuit protection circuit Download PDFInfo
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- CN209150709U CN209150709U CN201821927028.XU CN201821927028U CN209150709U CN 209150709 U CN209150709 U CN 209150709U CN 201821927028 U CN201821927028 U CN 201821927028U CN 209150709 U CN209150709 U CN 209150709U
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- load
- current transformer
- open circuit
- resistance
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Abstract
The utility model discloses a kind of current transformer load open circuit protection circuits, comprising: load blocks are power load；Electricity-fetching module obtains pulsating dc voltage for coupling energy from electricity network and rectifying；Switch module, for being connected when load blocks open circuit causes the output voltage of electricity-fetching module to rise to access protection fictitious load module；Protect fictitious load module; for the load blocks open circuit when fictitious load to protect circuit system; for the utility model by opening field-effect tube using current transformer open-circuit voltage, the load at automatic restoring current mutual inductor both ends realizes the protection to current transformer load open circuit.
Description
Technical field
The utility model relates to LED powers and battery charging monitoring field, load more particularly to a kind of current transformer
Open loop protection circuit.
Background technique
When current transformer (CT) works normally, secondary, which connects, loads the primary of the electric current and current transformer formed
The mutual degaussing of magnetic flux caused by electric current keeps the magnetic flux density in iron core lower (in 0.1T or less), and secondary voltage is stablized one
Lower design value；When secondary windings open circuit, primary current is constant, and in the case where secondary current is 0, secondary windings is gone
Magnetic magnetic flux disappears, and at this time primary current all becomes exciting current, makes core sataration (mutation), its magnetic flux density is up to
More than 1.8T.
The consequence of secondary open circuit is than more serious: first, secondary generates number kilovoltage, may puncture to secondary class B insulation, right
Personnel and equipment are dangerous；Second, increase is then lost in iron core mutation saturation, and iron core can generate heat, and be easily destroyed insulation；Third makes
Misalignment is measured, because the variation of magnetic flux is too high to generate remanent magnetism in the core, CT is increased than difference and angular difference.
In LED power and battery charging monitoring field, current transformer load open circuit is system in most cases
The main reason for failure.Although inspection is relatively simple, reparation wastes time and resource.Therefore, a kind of current transformer load
Open loop protection circuit is essential.
Utility model content
In order to overcome the deficiencies of the above existing technologies, the utility model to be designed to provide a kind of current transformer negative
Open loop protection circuit is carried, by opening field-effect tube, automatic restoring current mutual inductor both ends using current transformer open-circuit voltage
Load, realize protection to current transformer load open circuit.
In view of the above and other objects, the utility model proposes a kind of current transformer load open circuit protection circuits, comprising:
Load blocks are power load；
Electricity-fetching module obtains pulsating dc voltage for coupling energy from electricity network and rectifying；
Switch module, for being connected when load blocks open circuit causes the output voltage of electricity-fetching module to rise to access protection
Fictitious load module；
Protect fictitious load module, for the load blocks open circuit when fictitious load to protect circuit system.
Preferably, the electricity-fetching module includes punching current transformer T1.
Preferably, the switch module includes the first biasing resistor R1, the second biasing resistor R2 and field-effect tube M.
Preferably, the protection fictitious load module includes 3rd resistor R3.
Preferably, the load blocks are LED light group or the equivalent load resistance RL of charger.
Preferably, the punching current transformer T1 primary is mounted on line, and Same Name of Ends is connected to described negative
Carry one end of resistance RL, one end of the first biasing resistor R1,3rd resistor R3 one end, the first biasing resistor R1's is another
End is connected to one end of the second biasing resistor R2 and the grid of field-effect tube M, and the other end of 3rd resistor R3 is connected to effect pipe M
Drain electrode, the other end and the source electrode of field-effect tube M, the other end of load resistance RL of the second biasing resistor R2 be connected to described wear
The negative name end of electrocardio current transformer T1 forms the ground of system.
Preferably, the resistance value of the 3rd resistor R3 and the load resistance RL are close.
Preferably, the resistance value of the first biasing resistor R1, the second biasing resistor R2 are much larger than the load resistance RL's
Resistance value.
Compared with prior art, a kind of current transformer load open circuit protection circuit of the utility model utilizes current transformer
Open-circuit voltage opens field-effect tube, and the load at automatic restoring current mutual inductor both ends realizes a kind of for LED power and battery
The current transformer load open circuit protection circuit in charging monitoring field, may be implemented the protection to current transformer load open circuit.
Detailed description of the invention
Fig. 1 is a kind of circuit structure diagram of current transformer load open circuit protection circuit of the utility model.
Specific embodiment
Below by way of specific specific example and the embodiments of the present invention is described with reference to the drawings, those skilled in the art
Member can be understood easily the further advantage and effect of the utility model by content disclosed in the present specification.The utility model also may be used
It is implemented or is applied by other different specific examples, the various details in this specification can also be based on different viewpoints and answer
With, carried out under the spirit without departing substantially from the utility model it is various modification and change.
Fig. 1 is a kind of circuit structure diagram of current transformer load open circuit protection circuit of the utility model.As shown in Fig. 1,
A kind of current transformer load open circuit protection circuit of the utility model, comprising: electricity-fetching module 10, load blocks 20, switch module
30 and protection fictitious load module 40.
Wherein, electricity-fetching module 10 is formed by punching current transformer T1 and filter circuit and (is not shown place) and formed, and is used for from city
Electric network coupling energy simultaneously rectifies acquisition pulsating dc voltage；Load blocks 20 are the equivalent use of such as LED light group or charger
Electric loading RL；Switch module 30 is made of the first biasing resistor R1, the second biasing resistor R2 and field-effect tube M, for loading
Module 20, which is opened a way, causes the output voltage of electricity-fetching module 10 to be connected when rising to access protection fictitious load module 40；Protect fictitious load
Module 40 is made of resistance R3, and resistance value is suitable with 20 impedance of load blocks, for when load blocks 20 are opened a way simulation it is negative
It carries to protect circuit system.
In the utility model specific embodiment, which includes punching Current Mutual Inductance
Device T1, load resistance RL, resistance R1, R2, R3 and field-effect tube M.The utility model, which is able to achieve, fills the remote isolation of battery
Electricity.
Specifically, punching current transformer T1 primary is mounted on line by regulation, punching current transformer T1 times
Grade Same Name of Ends be connected to one end of load resistance RL, one end of the first biasing resistor R1, resistance R3 one end, resistance R1's is another
One end is connected to one end of the second biasing resistor R2 and the grid of field-effect tube M, and the other end of resistance R3 is connected to the leakage of effect pipe
Drain electrode, the source electrode of the other end of the second biasing resistor R2 and field-effect tube M, the other end of load resistance RL are connected to punching electricity
The negative name end of current transformer T1 forms the ground of system；
The resistance value of above-mentioned resistance R3 and above-mentioned load resistance RL are close.
Above-mentioned resistance R1, R2 resistance value is much larger than the resistance value of above-mentioned load resistance RL.
As it can be seen that a kind of current transformer load open circuit protection circuit of the utility model is opened using current transformer open-circuit voltage
Field-effect tube is opened, the load at automatic restoring current mutual inductor both ends realizes a kind of for LED power and battery charging monitoring neck
The current transformer load open circuit protection circuit in domain, may be implemented the protection to current transformer load open circuit.
The above embodiments are only illustrative of the principle and efficacy of the utility model, and not for limitation, this is practical new
Type.Anyone skilled in the art can repair above-described embodiment under the spirit and scope without prejudice to the utility model
Decorations and change.Therefore, the rights protection scope of the utility model, should be as listed in the claims.
Claims (8)
1. a kind of current transformer load open circuit protection circuit, which is characterized in that the circuit includes:
Load blocks are power load；
Electricity-fetching module obtains pulsating dc voltage for coupling energy from electricity network and rectifying；
Switch module, it is false negative to access protection for being connected when load blocks open circuit causes the output voltage of electricity-fetching module to rise
Carry module；
Protect fictitious load module, for the load blocks open circuit when fictitious load to protect circuit system.
2. a kind of current transformer load open circuit protection circuit as described in claim 1, it is characterised in that: the electricity-fetching module
Including punching current transformer T1.
3. a kind of current transformer load open circuit protection circuit as claimed in claim 2, it is characterised in that: the switch module
Including the first biasing resistor R1, the second biasing resistor R2 and field-effect tube M.
4. a kind of current transformer load open circuit protection circuit as claimed in claim 3, it is characterised in that: the protection is false negative
Carrying module includes 3rd resistor R3.
5. a kind of current transformer load open circuit protection circuit as claimed in claim 4, it is characterised in that: the load blocks
For LED light group or the equivalent load resistance RL of charger.
6. a kind of current transformer load open circuit protection circuit as claimed in claim 5, it is characterised in that: the punching electric current
Mutual inductor T1 primary is mounted on line, and Same Name of Ends is connected to one end of the load resistance RL, the first biasing resistor
One end of R1,3rd resistor R3 one end, the other end of the first biasing resistor R1 is connected to the one of the second biasing resistor R2
The grid at end and field-effect tube M, the other end of 3rd resistor R3 are connected to the drain electrode of effect pipe M, and the second biasing resistor R2's is another
One end is connected to the negative name end shape of the punching current transformer T1 with the source electrode of field-effect tube M, the other end of load resistance RL
At the ground of system.
7. a kind of current transformer load open circuit protection circuit as claimed in claim 6, it is characterised in that: the 3rd resistor
The resistance value of R3 and the load resistance RL are close.
8. a kind of current transformer load open circuit protection circuit as claimed in claim 6, it is characterised in that: first biasing
Resistance value of the resistance value much larger than the load resistance RL of resistance R1, the second biasing resistor R2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821927028.XU CN209150709U (en) | 2018-11-21 | 2018-11-21 | A kind of current transformer load open circuit protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821927028.XU CN209150709U (en) | 2018-11-21 | 2018-11-21 | A kind of current transformer load open circuit protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209150709U true CN209150709U (en) | 2019-07-23 |
Family
ID=67286924
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821927028.XU Active CN209150709U (en) | 2018-11-21 | 2018-11-21 | A kind of current transformer load open circuit protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209150709U (en) |
-
2018
- 2018-11-21 CN CN201821927028.XU patent/CN209150709U/en active Active
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