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Three-sectional protection method for resisting overcurrent

An overcurrent, three-stage technology, used in emergency protection circuit devices for limiting overcurrent/overvoltage, emergency protection devices for automatic disconnection, emergency protection circuit devices, etc., can solve high temperature overheating and damage to electronic products. , the increase of loss voltage, etc.

Inactive Publication Date: 2010-07-21
浩阳半导体股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, most of the above-mentioned traditional overcurrent protection circuits set the maximum load current value and the maximum delay time by resistor setting, so that when a sudden current passes, as long as the sudden current is greater than the maximum load current value and exceeds the maximum delay time , the circuit will immediately stop discharging, so the conventional overcurrent protection circuit will increase the maximum load current value and maximum delay time to the maximum value, which will increase the loss voltage and cause high temperature and overheating. damage electronic products using this overcurrent protection circuit

Method used

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  • Three-sectional protection method for resisting overcurrent

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Embodiment Construction

[0032] The present invention is a three-stage protection method for preventing overcurrent. In this embodiment, a practically applied circuit is used as an auxiliary description. Please refer to figure 2 As shown, the circuit is composed of a constant current integrator 10, a counter 12, a multiplier 14, a comparator 16, a current monitoring circuit 18, a differentiator 20 and a reset circuit 22, wherein the constant current The integrator 10 is composed of a plurality of resistors R1, R2 and two coupled transistors Q1, Q2 connected in series with a capacitor C1. When the input power supply terminal Vin is activated, the conduction of the two transistors Q1, Q2 is used to connect the capacitor C1. C1 is charged, and the comparison circuit of the counter 12 is composed of an amplifier OPA1 connected in series with a Zener diode D1 and a resistor R3. The multiplier 14 is composed of several resistors R4, R5, R6, R7 and a capacitor C2. The comparator 16 is a circuit composed of ...

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Abstract

The invention is concerned with the triadic sect protecting method for preventing the excess current, which is with different excess current protecting mode when the power inputting end is just activation and outputs the non-load, or when it is the minimum load, or the power inputting end outputs stably or the instantaneous outputting current increases extremely, therefore the invention can have different charge of current value and delay time with the inputting current change, thereby the electronic products can reduce the consumption of the voltage and the high temperature in order to increase the using life of the electronic products.

Description

technical field [0001] The invention relates to a current protection method, in particular to a three-stage overcurrent protection method capable of adjusting the load current value and delay time according to the magnitude of the current. Background technique [0002] By the way, electronic products are becoming more and more popular with the increase of demand, because sometimes due to improper use by users or sudden accidents, excessive voltage or excessive current will often be generated, and these overvoltages or overcurrents are very These devices are easily damaged. Therefore, in the circuit design, the design of overvoltage protection or overcurrent protection circuit will be added. [0003] see figure 1 As shown, it is an overcurrent protection circuit for a traditional modem. Under normal circumstances, the DC circuit formed by this circuit is: the external telephone signal is input from the telephone signal input terminal INPUT, and passes through the bridge re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/26H02H9/02
Inventor 廖源成
Owner 浩阳半导体股份有限公司
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