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Flexible limited current circuit

A current-limiting circuit, flexible technology, applied in circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, emergency protection circuit devices, etc., can solve the hidden danger of line safety, line failure, PTC insulation breakdown and other issues to achieve the effect of improving security and improving functions

Inactive Publication Date: 2013-05-08
江苏八益电器有限公司
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

When the line does not exceed the safe current or does not reach the PTC operating temperature, the positive temperature coefficient resistance is low, which basically does not affect the normal operation of the line; when the line is over-current or reaches the PTC operating temperature, the PTC resistance value rises several times instantaneously. order of magnitude, so that the protected line will be blocked, and it will take a certain time for the PTC to return to the normal temperature resistance. The overvoltage of the PTC will inevitably cause the PTC to maintain a high resistance value and withstand the overvoltage and cause thermal breakdown; if it encounters a high peak overvoltage, it will cause the PTC insulation breakdown, which will bring safety hazards to the entire line

Method used

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Embodiment Construction

[0015] Such as figure 1 The schematic structural diagram of the flexible current limiting circuit of the present invention is shown, which has a positive temperature coefficient resistance PTC branch 1, a silicon carbide non-linear resistance SiC branch 2, and a zinc oxide non-linear resistance ZnO branch 3, and the three resistance branches are connected in parallel.

[0016] Among them, the positive temperature coefficient resistance PTC branch 1 is composed of PTC chips with the characteristics of rapid protection and self-recovery in series, parallel or series-parallel combination. The material of PTC chips can be divided into polymer type and ceramic type.

[0017] The silicon carbide non-linear resistor SiC branch circuit 2 is composed of SiC chips with large leakage current, high residual voltage, poor nonlinearity, and good heat capacity in series, in parallel, or in a combination of series and parallel.

[0018] The zinc oxide non-linear resistor ZnO branch circuit 3 ...

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Abstract

The invention relates to the technical field of overcurrent protection of electricity power or an electronic circuit, in particular to a flexible limited current circuit. The flexible limited current circuit comprises a positive temperature coefficient (PTC) resistance PTC branch, a silicon carbide (SiC) nonlinear resistance SiC branch and a zinc oxide (ZnO) nonlinear resistor ZnO branch, wherein the resistance PTC branch, the nonlinear resistance SiC branch and the nonlinear resistor ZnO branch are connected in parallel. When the flexible limited current circuit is adopted to solve overcurrent problem of a circuit, the flexible limited current circuit is complete in function and has a self-protection function, maintenance is not needed, and safety of the circuit is greatly improved.

Description

technical field [0001] The invention relates to the technical field of electric power or electronic circuit overcurrent protection, and more specifically relates to a flexible current limiting circuit. Background technique [0002] Most of the fuses currently used are one-time fuses. When the fuse is blown due to overcurrent, the entire protected circuit will be disconnected. This has the advantage of high safety, but at the same time brings the disadvantages of poor system stability and troublesome replacement. [0003] In electronic systems, self-recovery fuses with positive temperature coefficient resistors PTC as the main component are also used as overcurrent protection devices for lines. When the line does not exceed the safe current or does not reach the PTC operating temperature, the positive temperature coefficient resistance is low, which basically does not affect the normal operation of the line; when the line is over-current or reaches the PTC operating temperatu...

Claims

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Application Information

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IPC IPC(8): H02H9/02H02H9/04
Inventor 苏东华马晓云其他发明人请求不公开姓名
Owner 江苏八益电器有限公司
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