CN107482584A - A kind of over-current protection method of electric tool - Google Patents
A kind of over-current protection method of electric tool Download PDFInfo
- Publication number
- CN107482584A CN107482584A CN201710710722.XA CN201710710722A CN107482584A CN 107482584 A CN107482584 A CN 107482584A CN 201710710722 A CN201710710722 A CN 201710710722A CN 107482584 A CN107482584 A CN 107482584A
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- China
- Prior art keywords
- module
- timing
- setting
- current value
- motor
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
- H02H7/0854—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load responsive to rate of change of current, couple or speed, e.g. anti-kickback protection
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- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The invention discloses a kind of over-current protection method of electric tool, feature is to comprise the following steps：Overcurrent protection detection module and timing module are set, current value is kept to store into overcurrent protection detection module the minimum operating of the over-current state motor current value of setting and setting, the excessively stream duration threshold of setting is stored into timing module, start electric tool, when detecting current motor current value in real time by overcurrent protection detection module and reaching the over-current state motor current value of setting, the timing by timing module, when the timing and continuous time exceeding the excessively stream duration threshold of setting, progressively reduce the dutycycle of pulse width modulating signal, until when detecting that current motor current value is reduced to below the minimum operating holding current value of setting, electric tool is taken out from working face, the startup situation of motor is detected by startup determination module and carries out follow-up corresponding operating；Advantage is effectively to reduce overall energy consumption, and improves operating efficiency.
Description
Technical field
The present invention relates to a kind of service behaviour guard method of electric tool, especially a kind of overcurrent protection of electric tool
Method.
Background technology
When existing electric tool is stuck in operation, the motor in electric tool can produce locked rotor current, locked rotor current
Certain time easily burns out motor and interlock circuit, in order to increase the duration of locked rotor current, it is necessary to using compared with
The MOSFET components of high cost are protected by；User is had found during stuck phenomenon, it is necessary to close electric tool and by electricity
Power driven tools take out from working face, in addition also need to wait electric tool cool down after the motor restarted in electric tool be operated,
Overall energy consumption is not only added, and influences operating efficiency.
The content of the invention
The technical problems to be solved by the invention are to provide that a kind of cost is relatively low, energy consumption is smaller and can effectively protect product
The over-current protection method of electric tool.
Technical scheme is used by the present invention solves above-mentioned technical problem：A kind of over-current protection method of electric tool,
Comprise the following steps：
（1）Overcurrent protection detection module and timing module are set in the control module of electric tool, by the over-current state of setting
The minimum operating of motor current value and setting keeps current value to store into overcurrent protection detection module, and the excessively stream of setting is continued
Time threshold is stored into timing module；
（2）Start electric tool, started working by the motor in the drive module driving electric tool in control module；
（3）Detect the current motor current value of motor in electric tool in real time by overcurrent protection detection module, it is current when detecting
When motor current value reaches the over-current state motor current value of setting, by overcurrent protection detection module send timing signal extremely
Timing module, the timing by timing module；
（4）When overcurrent protection detection module detects excessively stream duration threshold of the time in timing module timing not less than setting
Present current value is sent by overcurrent protection detection module less than the over-current state motor current value of setting and stops timing signal during value
To timing module, timing module stops timing and resets timing result；Exceed the mistake of setting when the time of timing module timing
When flowing duration threshold, step is performed（5）；
（5）Output is progressively reduced to the arteries and veins of drive module with the step value set by the Pulse width modulation module in control module
The dutycycle of bandwidth modulation signals is rushed, and brushless electric machine is driven according to the pulse width modulating signal received by drive module,
Until detect that current motor current value is equal to or less than the minimum operating holding current value of setting by overcurrent protection detection module
When, Pulse width modulation module stops reducing output to the dutycycle of the pulse width modulating signal of drive module, by driving mould
Root tuber performs step according to the pulse width modulating signal driving brushless electric machine being currently received（6）；
（6）Electric tool is taken out from working face, driven by drive module according to the pulse width modulating signal being currently received
Brushless electric machine, and by the startup situation for starting determination module detection motor in control module, detected when by startup determination module
To during electric motor starting success, continue to be operated working face using electric tool；When detecting motor by startup determination module
When starting failure, fault message is prompted from fault cues module to user.
Described startup determination module is detected using startup situation of the Hall element to described motor.
Compared with prior art, detected in real time in electric tool by overcurrent protection detection module the advantage of the invention is that working as
When the current motor current value of motor reaches the over-current state motor current value of setting, the timing by timing module, work as timing
When duration exceedes the excessively stream duration threshold of setting, progressively reduce output by Pulse width modulation module to drive module
Pulse width modulating signal dutycycle, until detecting that current motor current value is equal to or small by overcurrent protection detection module
When the minimum operating of setting keeps current value, stop reducing output to the duty of the pulse width modulating signal of drive module
Than brushless electric machine being driven according to the pulse width modulating signal that is currently received by drive module, by electric tool from working face
Take out, and the startup situation of motor is detected by startup determination module, when detecting electric motor starting success by startup determination module,
Continue to be operated working face using electric tool；When detecting electric motor starting failure by startup determination module, by failure
Reminding module prompts fault message to user；Stall feelings during electric tool work can be detected in time using above method
Condition, and reduce current motor electric current by progressively reducing output to the dutycycle of the pulse width modulating signal of drive module
Value, until the minimum operating for being reduced to setting stops continuing to reduce current motor current value when keeping below current value, realizing
While effectively protection to motor, with minimum operating current value can be kept to maintain motor operating, so that when user will
After working face taking-up, electric tool be able to can just remain in operation electric tool without restarting, effectively reduce overall energy consumption,
And improve operating efficiency.
Brief description of the drawings
Fig. 1 is the principle process schematic diagram of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing embodiment.
A kind of over-current protection method of electric tool, comprises the following steps：
（1）Overcurrent protection detection module and timing module are set in the control module of electric tool, by the over-current state of setting
The minimum operating of motor current value and setting keeps current value to store into overcurrent protection detection module, and the excessively stream of setting is continued
Time threshold is stored into timing module；
（2）Start electric tool, started working by the motor in the drive module driving electric tool in control module；
（3）Detect the current motor current value of motor in electric tool in real time by overcurrent protection detection module, it is current when detecting
When motor current value reaches the over-current state motor current value of setting, by overcurrent protection detection module send timing signal extremely
Timing module, the timing by timing module；
（4）When overcurrent protection detection module detects excessively stream duration threshold of the time in timing module timing not less than setting
Present current value is sent by overcurrent protection detection module less than the over-current state motor current value of setting and stops timing signal during value
To timing module, timing module stops timing and resets timing result；Exceed the mistake of setting when the time of timing module timing
When flowing duration threshold, step is performed（5）；
（5）Output is progressively reduced to the arteries and veins of drive module with the step value set by the Pulse width modulation module in control module
The dutycycle of bandwidth modulation signals is rushed, and brushless electric machine is driven according to the pulse width modulating signal received by drive module,
Until detect that current motor current value is equal to or less than the minimum operating holding current value of setting by overcurrent protection detection module
When, Pulse width modulation module stops reducing output to the dutycycle of the pulse width modulating signal of drive module, by driving mould
Root tuber performs step according to the pulse width modulating signal driving brushless electric machine being currently received（6）；
（6）Electric tool is taken out from working face, driven by drive module according to the pulse width modulating signal being currently received
Brushless electric machine, and by the startup situation for starting determination module detection motor in control module, detected when by startup determination module
To during electric motor starting success, continue to be operated working face using electric tool；When detecting motor by startup determination module
When starting failure, fault message is prompted from fault cues module to user.
Claims (2)
1. a kind of over-current protection method of electric tool, it is characterised in that comprise the following steps：
（1）Overcurrent protection detection module and timing module are set in the control module of electric tool, by the over-current state of setting
The minimum operating of motor current value and setting keeps current value to store into overcurrent protection detection module, and the excessively stream of setting is continued
Time threshold is stored into timing module；
（2）Start electric tool, started working by the motor in the drive module driving electric tool in control module；
（3）Detect the current motor current value of motor in electric tool in real time by overcurrent protection detection module, it is current when detecting
When motor current value reaches the over-current state motor current value of setting, by overcurrent protection detection module send timing signal extremely
Timing module, the timing by timing module；
（4）When overcurrent protection detection module detects excessively stream duration threshold of the time in timing module timing not less than setting
Present current value is sent by overcurrent protection detection module less than the over-current state motor current value of setting and stops timing signal during value
To timing module, timing module stops timing and resets timing result；Exceed the mistake of setting when the time of timing module timing
When flowing duration threshold, step is performed（5）；
（5）Output is progressively reduced to the arteries and veins of drive module with the step value set by the Pulse width modulation module in control module
The dutycycle of bandwidth modulation signals is rushed, and brushless electric machine is driven according to the pulse width modulating signal received by drive module,
Until detect that current motor current value is equal to or less than the minimum operating holding current value of setting by overcurrent protection detection module
When, Pulse width modulation module stops reducing output to the dutycycle of the pulse width modulating signal of drive module, by driving mould
Root tuber performs step according to the pulse width modulating signal driving brushless electric machine being currently received（6）；
（6）Electric tool is taken out from working face, driven by drive module according to the pulse width modulating signal being currently received
Brushless electric machine, and by the startup situation for starting determination module detection motor in control module, detected when by startup determination module
To during electric motor starting success, continue to be operated working face using electric tool；When detecting motor by startup determination module
When starting failure, fault message is prompted from fault cues module to user.
2. the over-current protection method of a kind of electric tool according to claim 1, it is characterised in that described startup judges
Module is detected using startup situation of the Hall element to described motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710710722.XA CN107482584A (en) | 2017-08-18 | 2017-08-18 | A kind of over-current protection method of electric tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710710722.XA CN107482584A (en) | 2017-08-18 | 2017-08-18 | A kind of over-current protection method of electric tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107482584A true CN107482584A (en) | 2017-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710710722.XA Pending CN107482584A (en) | 2017-08-18 | 2017-08-18 | A kind of over-current protection method of electric tool |
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| Country | Link |
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| CN (1) | CN107482584A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112332721A (en) * | 2020-10-29 | 2021-02-05 | 珠海优特智厨科技有限公司 | Control method, control device and control circuit of direct current motor |
| CN116599001A (en) * | 2023-04-23 | 2023-08-15 | 珠海芯烨电子科技有限公司 | Protection method and system for stepping motor of printing terminal |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101103507A (en) * | 2005-09-06 | 2008-01-09 | 罗姆股份有限公司 | Overcurrent protective circuit, load driving unit, motor driving unit, electrical equipment, and power unit |
| CN102681451A (en) * | 2012-05-10 | 2012-09-19 | 南京德朔实业有限公司 | Electric tool with memorizing function and method for realizing motor shaft lock protection |
| CN103124065A (en) * | 2011-11-18 | 2013-05-29 | 苏州宝时得电动工具有限公司 | Electric tool and control method thereof |
| CN105846755A (en) * | 2015-01-14 | 2016-08-10 | 南京德朔实业有限公司 | Electric tool and motor control method |
| US20160334468A1 (en) * | 2015-05-13 | 2016-11-17 | Schweitzer Engineering Laboratories, Inc. | Electric motor protection using a virtual speed switch |
-
2017
- 2017-08-18 CN CN201710710722.XA patent/CN107482584A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101103507A (en) * | 2005-09-06 | 2008-01-09 | 罗姆股份有限公司 | Overcurrent protective circuit, load driving unit, motor driving unit, electrical equipment, and power unit |
| CN103124065A (en) * | 2011-11-18 | 2013-05-29 | 苏州宝时得电动工具有限公司 | Electric tool and control method thereof |
| CN102681451A (en) * | 2012-05-10 | 2012-09-19 | 南京德朔实业有限公司 | Electric tool with memorizing function and method for realizing motor shaft lock protection |
| CN105846755A (en) * | 2015-01-14 | 2016-08-10 | 南京德朔实业有限公司 | Electric tool and motor control method |
| US20160334468A1 (en) * | 2015-05-13 | 2016-11-17 | Schweitzer Engineering Laboratories, Inc. | Electric motor protection using a virtual speed switch |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112332721A (en) * | 2020-10-29 | 2021-02-05 | 珠海优特智厨科技有限公司 | Control method, control device and control circuit of direct current motor |
| CN112332721B (en) * | 2020-10-29 | 2022-04-08 | 珠海优特智厨科技有限公司 | Control method, control device and control circuit of direct current motor |
| CN116599001A (en) * | 2023-04-23 | 2023-08-15 | 珠海芯烨电子科技有限公司 | Protection method and system for stepping motor of printing terminal |
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Application publication date: 20171215 |
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