CN201872152U - Overload protector for electric tool - Google Patents
Overload protector for electric tool Download PDFInfo
- Publication number
- CN201872152U CN201872152U CN2010206158463U CN201020615846U CN201872152U CN 201872152 U CN201872152 U CN 201872152U CN 2010206158463 U CN2010206158463 U CN 2010206158463U CN 201020615846 U CN201020615846 U CN 201020615846U CN 201872152 U CN201872152 U CN 201872152U
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- electric tool
- motor
- circuit
- battery pack
- mcu
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Abstract
The utility model relates to an overload protector for an electric tool, which comprises a microprogrammed control unit (MCU), a battery pack, a motor driving circuit, a current detecting circuit, a voltage stabilizing circuit and an external power supply end, wherein the battery pack, the motor driving circuit, the current detecting circuit and the voltage stabilizing circuit are all connected with the MCU, the current detecting circuit is connected with the motor driving circuit, the voltage stabilizing circuit and the battery pack are both connected with the external power supply end, and in addition, the voltage stabilizing circuit is connected with the battery pack. When the overload protector for the electric tool is adopted for protecting the electric tool, the service life of the electric tool is prolonged, the electric tool can not be burnt, and in addition, the safety is high.
Description
Technical field:
The utility model relates to field of power tools, specifically is a kind of overload protection arrangement that is used for electric tool.
Background technology:
At present; for the ease of carrying; some electric tool adopts chargeable lithium cell as power supply; but; electric tool excessive the or other reasons of load occurs through regular meeting and causes the rotor stall; current of electric sharply increases; if untimely processing this moment; light then influence service life of motor; heavy then cause the motor short circuit and burn motor, and if this electric tool be hand-held, cause Motor torque to increase suddenly because current of electric sharply increases so probably; thereby hurt the operator, security is not high.Therefore, be badly in need of a kind of overload protection arrangement that is used for electric tool at present.
The utility model content:
A technical problem to be solved in the utility model is, overcomes existing technological deficiency, and a kind of protection electric tool is provided, and makes electric tool life-span height, can not burnt, and the safe overload protection arrangement that is used for electric tool.
A technical solution of the present utility model is; a kind of overload protection arrangement that is used for electric tool is provided; it comprises MCU, battery pack, motor-drive circuit, current detection circuit, mu balanced circuit and external power supply end; described battery pack, motor-drive circuit, current detection circuit and mu balanced circuit all are connected with MCU; described current detection circuit is connected with motor-drive circuit; described mu balanced circuit all is connected with the external power supply end with battery pack, and mu balanced circuit is connected with battery pack.
As improvement, it also comprises temperature sensor, and described temperature sensor is connected with MCU, and the probe of described temperature sensor contacts with motor.Adopt temperature sensor, when temperature was too high, in time disable motor prevented that motor from burning out.
Compared with prior art; the utility model adopts the core of MCU chip as overload protection arrangement; adopt current detection circuit to detect the electric current of motor-drive circuit; when motor breaks down; disable motor in time when electric current increases, the protection electric tool makes electric tool life-span height; can do not burnt, and safe.And the overload protection method that the utility model is used for electric tool has also adopted three-level protective; under the failure condition of different brackets, give the protection of different brackets; thereby make the overload protection of electric tool intelligent more, can not cause the frequent stop and start of electric tool motor because of the protection of single-grade.
Description of drawings:
Accompanying drawing 1 is the circuit block diagram that the utility model is used for the overload protection arrangement of electric tool;
Accompanying drawing 2 is method flow diagrams that the utility model is used for the overload protection arrangement of electric tool.
The specific embodiment:
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
As shown in Figure 1; the utility model provides a kind of overload protection arrangement that is used for electric tool; it comprises MCU, battery pack, motor-drive circuit, current detection circuit, mu balanced circuit and external power supply end; described battery pack, motor-drive circuit, current detection circuit and mu balanced circuit all are connected with MCU; described current detection circuit is connected with motor-drive circuit; described mu balanced circuit all is connected with the external power supply end with battery pack, and mu balanced circuit is connected with battery pack.Described battery pack adopts the lithium battery of four series connection, and described motor-drive circuit adopts the metal-oxide-semiconductor drive motors, and described current detection circuit, mu balanced circuit are custom circuit, and described external power supply end adopts plug to be electrically connected as the external power supply end with outside city.
As improvement, it also comprises temperature sensor, and described temperature sensor is connected with MCU.Adopt temperature sensor, when temperature was too high, in time disable motor prevented that motor from burning out.Described temperature sensor adopts thermistor in the present embodiment.
As shown in Figure 2, the utility model also provides a kind of overload protection method that is used for electric tool, and it may further comprise the steps:
Step (1), open motor, adopt current detection circuit to detect the electric current output of motor-drive circuit, if current value during greater than setting value a, is judged the motor short circuit, through disable motor behind the setting-up time t1, if current value during less than setting value a, enters next step; A is 90A in the present embodiment, and t1 is 0.1s, when electric current during greater than 90A, can judge the motor short circuit, is made as three-level protective, and 0.1s is disable motor at once just.
Step (2), detect the electric current output of motor-drive circuit once more, if current value is during greater than setting value b, through disable motor behind the setting-up time t2, if current value enters next step less than setting value b; Wherein b is 45A, and t2 is 0.5s, when electric current during greater than 45A, sets this and is second class protection, disable motor behind the 0.5s.
Step (3), detect the electric current output of motor-drive circuit once more, if current value is during greater than setting value c, through disable motor behind the setting-up time t3, if current value is during less than setting value c, normal operation; Wherein c is 15A, and t3 is 2s, when electric current during, set this and be first class of protection greater than 15A, though this moment, motor had fault, might be provisional fault, and so set disable motor behind the 2s, if the releasing of 2s internal fault, then motor normally moves.If electric current is less than 15A, then motor is a normal operating condition, does not do action.
Wherein set value a＞b＞c, time value t1＜t2＜t3.
As improvement, the described overload protection method that is used for electric tool also comprises:
Step (4) adopts temperature sensor to detect motor temperature, if temperature value is during greater than setting value d, through disable motor after the setting-up time t4.In the present embodiment, described d is 90 °, and described t4 is 1s.Adopt temperature sensor, when temperature was too high, in time disable motor prevented that motor from burning out.
Claims (2)
1. overload protection arrangement that is used for electric tool; it is characterized in that: it comprises MCU, battery pack, motor-drive circuit, current detection circuit, mu balanced circuit and external power supply end; described battery pack, motor-drive circuit, current detection circuit and mu balanced circuit all are connected with MCU; described current detection circuit is connected with motor-drive circuit; described mu balanced circuit all is connected with the external power supply end with battery pack, and mu balanced circuit is connected with battery pack.
2. the overload protection arrangement that is used for electric tool according to claim 1 is characterized in that: it also comprises temperature sensor, and described temperature sensor is connected with MCU, and the probe of described temperature sensor contacts with motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206158463U CN201872152U (en) | 2010-11-11 | 2010-11-11 | Overload protector for electric tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206158463U CN201872152U (en) | 2010-11-11 | 2010-11-11 | Overload protector for electric tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201872152U true CN201872152U (en) | 2011-06-22 |
Family
ID=44160085
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206158463U Expired - Fee Related CN201872152U (en) | 2010-11-11 | 2010-11-11 | Overload protector for electric tool |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201872152U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102005730A (en) * | 2010-11-11 | 2011-04-06 | 陈会甫 | Overload protection device and method for electric tool |
| CN105127946A (en) * | 2015-09-06 | 2015-12-09 | 滁州市洪武报废汽车回收拆解利用有限公司 | Automatic nut dismantling device for scraped car |
| CN106640690A (en) * | 2016-12-28 | 2017-05-10 | 上海市城市排水有限公司机修安装分公司 | Real-time long-range monitoring system for drainage pump and real-time long-range monitoring method of real-time long-range monitoring system |
-
2010
- 2010-11-11 CN CN2010206158463U patent/CN201872152U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102005730A (en) * | 2010-11-11 | 2011-04-06 | 陈会甫 | Overload protection device and method for electric tool |
| CN105127946A (en) * | 2015-09-06 | 2015-12-09 | 滁州市洪武报废汽车回收拆解利用有限公司 | Automatic nut dismantling device for scraped car |
| CN106640690A (en) * | 2016-12-28 | 2017-05-10 | 上海市城市排水有限公司机修安装分公司 | Real-time long-range monitoring system for drainage pump and real-time long-range monitoring method of real-time long-range monitoring system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110622 Termination date: 20141111 |
|
| EXPY | Termination of patent right or utility model |