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Inverter with timekeeping function

一种逆变器、变换器的技术，应用在不可逆的直流功率输入变换为交流功率输出的、电气元件、紧急保护电路装置等方向，能够解决负担等问题

Inactive Publication Date: 2007-10-10
FUJI ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since there is usually no battery placed in the inverter, the reset time will be required in the event of a power outage, even with an expensive and accurate oscillator, placing a greater burden on the user as the installation manager

Method used

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  • Inverter with timekeeping function
  • Inverter with timekeeping function

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Experimental program
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Embodiment Construction

[0018] The present invention will now be described in detail hereinafter with reference to the accompanying drawings that illustrate specific embodiments of the invention.

[0019] FIG. 1 is a block diagram describing the configuration of an inverter according to a first embodiment of the present invention. In FIG. 1 , an inverter 0 , a commercial AC input power source (hereinafter will be referred to as "main power source") 1 , a motor 5 , and a load 6 are shown. The inverter 0 includes: a forward converter circuit 2 that rectifies AC fed from an AC power source 1 to convert the AC into DC; a capacitor 3 that smoothes the rectified output from the forward converter circuit 2; An inverter circuit 4 that converts DC to AC modulated by PWM and having an arbitrary frequency and an arbitrary voltage within a corresponding predetermined range. The motor 5 drives a load 6 .

[0020] A control power supply different from the main power supply 1 is connected to the control power sup...

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PUM

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Abstract

The inverter according to the invention includes a control microcomputer including a protector circuit that stops the inverter when an anomaly is caused, a counter that counts the driving clock signals of the microcomputer from the instance at which the protector circuit starts working, and a conversion circuit that converts the clock signals counted by the counter to a numerical time expression in the time units and outputs the converted numerical time expression. The inverter according to the invention, manufacturable with low manufacturing costs and easy to operate, facilitates informing the installation manager of the period of time from the instance at which the inverter stopped due to an anomaly and such a cause, without impairing the time measurement precision.

Description

technical field [0001] The present invention relates to an inverter driving loads of various devices, and more particularly, to an inverter exhibiting a function of measuring a stop period when the inverter stops operating by a protection function. Background technique [0002] In many installations, inverters are used to drive electric motors and loads of the installation. The inverter is provided with a protection circuit for protection against abnormalities such as over-current protection, overload protection, over-voltage protection, and low-voltage protection when the inverter is operating to stop the device when any abnormality is detected run. In order to manage the working status of the device, the device administrator needs to know the stop time of the inverter and the device. [0003] In order to monitor the moment of stop due to running the protection circuit of the inverter, the clock function of the advanced programmable controller is usually used in the devic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48
CPCH02H7/122
Inventor 林宽明
Owner FUJI ELECTRIC CO LTD