Huge flush out current, short circuit and overload protection three in one circuit

An overload protection, three-in-one technology, applied in the direction of emergency protection circuit devices, electrical components, etc.

Inactive Publication Date: 2003-12-03
DELTA ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, once the output is short-circuited, its short-circuit current is very large and continues to output, and the components with excessive voltage drop will generate a large amount of heat and indirectly damage the components due to the huge short-circuit current flowing.

Method used

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  • Huge flush out current, short circuit and overload protection three in one circuit
  • Huge flush out current, short circuit and overload protection three in one circuit
  • Huge flush out current, short circuit and overload protection three in one circuit

Examples

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Effect test

no. 1 Embodiment

[0042] The first specific embodiment of the present invention has the following characteristics:

[0043] 1. Protect the working power supply of the line from any improper operation: the secondary side of the transformer is directly rectified by an independent rectifier circuit (different from the main output rectifier circuit) to obtain the second power supply, even in a short circuit state, the transformer There is still energy transfer, though small but enough for the protection circuit to operate properly.

[0044] 2. Voltage comparison potential: In order to obtain accurate overload protection potential, an independent voltage potential is required.

[0045] 3. Limit the output time of huge rush-out current and overload current (T2 timer): use the RC charging circuit (T2 timer) to limit the maximum time of huge rush-out current and overload current output.

[0046] 4. When the protection function occurs, limit the time for the system to stop working: use the RC discharge...

no. 2 Embodiment

[0048] The second specific embodiment then has the following characteristics:

[0049] 1. Protect the working power of the line from any improper operation: the secondary side of the transformer is directly rectified by an independent rectifier circuit (different from the main output rectifier circuit) to obtain the second power supply, even in a short-circuit state Under normal circumstances, the transformer still has energy transfer, which is small but sufficient for the normal operation of the protection circuit.

[0050] 2. Excellent anti-noise ability: the current detector of the power converter is usually replaced by a resistor, so the current signal has considerable noise, and the noise can be filtered out through the hysteresis circuit.

[0051] 3. Independent voltage comparison potential: In order to obtain accurate overload protection potential, an independent voltage potential is required.

[0052] 4. Limit the output time of huge rush-out current and overload curr...

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Abstract

A 3-in-1 circuit for the protection of huge surge current, short circuit and overload features that the secondary winding of transformer in power supply is used as the secondary power supply for providing current to said protecting circuit when output circuit is shorted, a current detector installed at said secondary winding is used to detect the generation of overload current, and a timer is used to set up the time when the rated huge surge current can be generated to restrict its generation.

Description

technical field [0001] The invention relates to a power supply protection circuit, in particular to a three-in-one circuit for huge rush-out current, short circuit and overload protection. Background technique [0002] Generally speaking, a power supply has its rated output power, output voltage and output current. Within these rated operating ranges, the power supply will work normally. Outside the rated operating range, some protection circuits must be designed to protect the power supply circuit. For example, when a large electromagnetic contactor operates, the power supply needs to provide a huge rush current (Out-rush Current), which is several times larger than the overload current (Overload Current) (about 1.5`3 times or higher); The rated current is many times larger (about 7 times or higher). Therefore, when designing a power supply, the huge rush current and overload protection are generally taken into consideration. [0003] figure 1 Shown is a block diagram ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/122
CPCH02H7/122
Inventor 丁锦贤蔡硕有
Owner DELTA ELECTRONICS INC
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