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Management circuit for self-powered microprocessor protection device microprocessor

A microcomputer protection device and microprocessor technology, applied in data processing power supply, data reset device, generation of response error, etc., can solve problems such as external power supply Vcc reset misoperation, and achieve wide applicability, flexible setting, and simple circuit Effect

Inactive Publication Date: 2014-06-25
浙江知祺电力自动化有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] For this reason, the present invention solves the problem that in the prior art, only the reset input is implemented when the external power supply Vcc has power, and the reset isolation exit function is reset when the Vcc is without power, and there is a problem that the external power supply Vcc resets incorrectly during the power-on process and the power-off process. Thereby providing a microprocessor management circuit that will not malfunction during power-on and power-off, and truly realizes the reliable application of watchdog reset

Method used

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  • Management circuit for self-powered microprocessor protection device microprocessor
  • Management circuit for self-powered microprocessor protection device microprocessor
  • Management circuit for self-powered microprocessor protection device microprocessor

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Embodiment 1

[0032] The microprocessor management circuit of the self-powered microcomputer protection device described in the present invention, such as figure 1 As shown, it includes a watchdog circuit, the watchdog circuit is a watchdog circuit with pulse output, and the pulse width can be adjusted to meet the requirements of different microprocessors for the external reset pulse width. The dog circuit is connected with the microprocessor watchdog clearing output terminal, and the microprocessor outputs a pulse-type watchdog feeding dog signal, and the watchdog timer is cleared by using the rising edge or falling edge of the signal. The watchdog timer is overtime and outputs a reset signal; it is also provided with a power monitoring reset circuit, which is externally connected to an external power supply. If the external power supply supplies power to the microprocessor through a diode, then in order to make the voltage of the power monitoring reset circuit input and the microprocessor ...

Embodiment 2

[0035] On the basis of the microprocessor management circuit of the self-powered microcomputer protection device described in embodiment 1, the watchdog circuit includes a feedback loop and a watchdog timer, such as figure 2 As shown, the watchdog timer, the power supply monitoring reset circuit and the comparator are integrated and arranged on the integrated circuit in this embodiment. In practice, the chip MAX706 is used, and the input and output ends of each circuit adopt the MAX706 chip. Pin, the WDI end of the MAX706 chip is the input end of the watchdog timer, which is connected with the general IO pin of the microprocessor, and the IO pin outputs a pulsed watchdog feed dog signal, Utilize the rising edge and the falling edge of this signal to realize the clearing of watchdog timer, the WDO end of described MAX706 chip is the output end of described watchdog timer, after described watchdog timer starts, WDO end outputs High level, and during the timing process, keep hig...

Embodiment 3

[0042] On the basis of the microprocessor management circuit of the self-powered microcomputer protection device described in Embodiment 1, the watchdog circuit includes a feedback loop and a watchdog timer, and the watchdog timer, the power monitoring reset The circuit and the comparator are integrated and arranged on the integrated circuit in this embodiment, and the chip MAX706 is actually used, and the input and output ends of each circuit adopt the pins of the MAX706 chip, and the WDI end of the MAX706 chip is the watchdog The input terminal of the timer is connected with the general-purpose IO pin of the microprocessor, and the IO pin outputs a pulse-type watchdog feeding dog signal, and the rising and falling edges of the signal are used to realize the watchdog timer. cleared, the WDO terminal of the MAX706 chip is the output terminal of the watchdog timer, and the WDO terminal outputs a high level after the watchdog timer starts, and maintains a high level during the ti...

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Abstract

A management circuit for a self-powered microprocessor protection device microprocessor comprises a watchdog circuit, a power monitoring and resetting circuit and a logic enabling circuit, wherein the logic enabling circuit is connected with the output end of the watchdog circuit and the output end of the power monitoring and resetting circuit. When the power monitoring and resetting circuit outputs effective power signals and the watchdog circuit outputs resetting signals, resetting signals of the microprocessor are output. Resetting false operation generated in the power-on and power-off processes of an external power source are avoided. Resetting false operation caused by delayed resetting when a general watchdog circuit is used after the power is connected can be avoided. The power monitoring and resetting circuit is connected with the microprocessor and provides effective signals, synchronous with the watchdog circuit, of the external power source, real-time monitoring of the state of the external power source and synchronizing of the watchdog circuit can be achieved by the microprocessor, and false operation due to the fact that the microprocessor can not forecast the state of the watchdog circuit can be avoided. Based on the synchronous signals, active peripheral circuit management is achieved, and the power consumption is reduced.

Description

technical field [0001] The invention relates to a microprocessor reset circuit, in particular to a microprocessor management circuit of a self-powered microcomputer protection device. Background technique [0002] Power system microcomputer protection device adopts embedded microprocessor technology to detect line voltage and current in switchgear equipment, control circuit breaker, fault judgment, realize fault action and alarm, etc. It is an important equipment for safe and reliable operation of power system transmission and distribution. ;In recent years, with the extensive use of ring network cabinets, the demand for microcomputer protection devices has continued to increase, which has promoted the development of self-powered microcomputer protection devices. The so-called self-powered microcomputer protection device does not need an external special power supply, but uses a set of windings with a certain power supply power of the current transformer connected to it to a...

Claims

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Application Information

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IPC IPC(8): G06F1/24G06F1/28G06F11/07
Inventor 黄觉寒王永良杨挺
Owner 浙江知祺电力自动化有限公司
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