Quick response low level reset circuit for preventing supply voltage collapse and high-frequency interference

A high-frequency interference, fast response technology, applied in data reset devices, electrical components, electronic switches, etc., can solve the problems of many devices, poor cost performance, low voltage, etc., and achieve the effect of wide application prospects, high cost performance, and simple lines

Inactive Publication Date: 2016-07-27
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Simple resistance-capacitance reset circuit without detection of power supply. Although the structure is simple, it cannot give a reset signal after the power supply voltage collapses, resulting in unstable system operation.
Although the reset circuit containing a triode can prevent repeated resets caused by power supply jitter, it is powerless against the collapse of the power supply voltage.
The existing dual-tube reset circuit with power detection has many components, high cost, slow response speed, and poor cost performance
The cost of a dedicated reset IC is too high; in the case of high-frequency interference, many commonly used reset circuits will mistakenly issue a reset

Method used

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  • Quick response low level reset circuit for preventing supply voltage collapse and high-frequency interference

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Embodiment Construction

[0014] In order to make the technical solution of the present invention more clear, the following will be further described in detail in conjunction with the accompanying drawings.

[0015] figure 1 Among them, VCC is the power supply, GND is the ground; C1 is the capacitor; R1 is the bias resistor; R2 is the load resistor; Q1 is the PNP transistor; DW1 is the two-terminal voltage regulator tube; D1 is the diode; The reset pin of the CPU.

[0016] A fast-response low-level reset circuit against power supply voltage collapse and high-frequency interference, including a PNP transistor (Q1), a two-terminal voltage regulator (DW1), a diode (D1), a capacitor (C1), and a bias resistor (R1) , magnetic beads (L1), load resistor (R2) a total of 7 devices. The connection method is: one end of the capacitor (C1) is connected to the emitter of the PNP transistor (Q1) and then connected to the power supply (VCC), and the other end of the capacitor (C1) is connected to the cathode of the ...

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Abstract

Disclosed is a fast-response low-level reset circuit resistant to power supply voltage collapse and high-frequency interference, which is used for power-on reset and reset when power supply voltage collapses for the CPU, and can prevent false reset caused by high-frequency interference signals; the reset circuit includes a PNP type triode, a two-terminal voltage regulator, a diode, a capacitor, a load resistor, a magnetic bead and a bias resistor; the charging of the capacitor is used to obtain an appropriate reset time, and the diode is used to realize the rapid recovery of the capacitor when the voltage collapses Discharge to realize the reset when the voltage collapses, and use the high-frequency and high-impedance characteristics of the magnetic beads to prevent false resets. The circuit of the reset circuit is simple, the function is reliable, the cost performance is high, and it has a wide application prospect.

Description

technical field [0001] The invention relates to the application technical field of the CPU, in particular to a reset circuit capable of quickly responding to power supply voltage collapse and preventing misoperation caused by high-frequency interference. Background technique [0002] Existing electronic products are more and more commonly controlled by CPU. When the CPU is powered on and the power supply voltage collapses, a reset operation is required. The quality of CPU reset directly affects the stability and reliability of electronic products. Due to the instability of the working voltage, if there is no reset circuit to reset the CPU, it is very easy to cause the CPU to crash or malfunction when the power supply is in a fluctuating state. Reset means that the reset pin of the CPU is provided with a reset level (high or low) opposite to the normal working level within a certain time range to meet the CPU reset requirements. [0003] In the prior art, commonly used reset...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K17/22G06F1/24
CPCH03K17/22G06F1/24
Inventor 廖晓东王敏曾水生
Owner FUJIAN NORMAL UNIV
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