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Motor lock-detection circuit and control method therefor

A technology for locking detection and control methods, which is applied in motor control, electrical recording technology using charge patterns, control systems, etc., and can solve problems such as device damage, ignition, and insufficient cooling.

Inactive Publication Date: 2014-10-08
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the motor that drives the fan (hereinafter referred to as the fan motor) is abnormal and the rotation of the motor is stopped (hereinafter referred to as locked) even though power is supplied, the cooling inside the image forming apparatus becomes insufficient, and the apparatus may be damaged.
In addition, if the fan motor is normal, but the rotation of the fan is stopped due to foreign matter, etc. (the rotation of the fan motor is also stopped), the fan motor becomes overloaded and generates heat, which may catch fire.

Method used

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  • Motor lock-detection circuit and control method therefor
  • Motor lock-detection circuit and control method therefor
  • Motor lock-detection circuit and control method therefor

Examples

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Embodiment Construction

[0044] In the following embodiments, the same reference numerals are attached to the same components. Their names and functions are also the same. Therefore, detailed descriptions of them are not repeated.

[0045] refer to Figure 4 , the lock detection circuit 200 according to the embodiment of the present invention includes a CPU 202, a first switch 220, a second switch 222, an "OR" operation element 230, a first gate 240, a second gate 242, a first pull-up resistor 250, a first Two pull-up resistors 252 , a first pull-down resistor 254 , a second pull-down resistor 256 , a ROM 260 , a RAM 262 , and a timer (timer) 264 .

[0046] A ROM (Read Only Memory) 260 stores programs and data necessary for controlling the operation of the lock detection circuit 200 . The ROM 260 is a nonvolatile storage device that retains data even when power is turned off. RAM (Random Access Memory: Random Access Memory) 262 is a volatile storage device. The CPU 202 controls the first fan moto...

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PUM

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Abstract

This lock-detection circuit is provided with: a CPU (204); switches (220 to 224) that are controlled by control signals (FAN1 to FANn) outputted from the CPU and supply power to motors (210 to 214); gates (240 to 244) that are controlled by the control signals and output inputted motor-state signals (LD1 to LDn) as signals (XLD1 to XLDn); and an element (232) that outputs a signal (LOCK) consisting of the disjunction of the aforementioned output signals (XLD1 to XLDn). If said signal (LOCK) indicates that a lock has occurred, the CPU determines the whether a lock has occurred for each motor by evaluating the level of the signal (LOCK) with just one of the control signals at a high level. This makes it possible to identify the locked motor.

Description

technical field [0001] The present invention relates to a lock detection circuit and a control method thereof for identifying a motor that has stopped rotating (locked) due to an abnormality when one CPU drives a plurality of motors. Background technique [0002] As one type of image processing apparatus as electronic equipment, image forming apparatuses (typically copiers) that form images on recording paper are installed in many workplaces (companies, offices, etc.). A multifunctional peripheral (MFP (Multi Function Peripheral)) as one type of image forming apparatus has a copy function, a facsimile (hereinafter also referred to as a FAX) function, a network-compatible printing function, and a scanning function. function. [0003] When the image forming apparatus performs various functions, heat is generated inside the image forming apparatus. For example, an image forming apparatus includes a heater for heating toner to fix to recording paper in order to realize copying...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P5/68
CPCF04D1/00G03G15/55G03G21/206H02P29/021
Inventor 甲斐裕基
Owner SHARP KK