CN101119111A - Switch used for electric hand-tool and having cumulating property safety function - Google Patents
Switch used for electric hand-tool and having cumulating property safety function Download PDFInfo
- Publication number
- CN101119111A CN101119111A CNA2007101368538A CN200710136853A CN101119111A CN 101119111 A CN101119111 A CN 101119111A CN A2007101368538 A CNA2007101368538 A CN A2007101368538A CN 200710136853 A CN200710136853 A CN 200710136853A CN 101119111 A CN101119111 A CN 101119111A
- Authority
- CN
- China
- Prior art keywords
- switch
- value
- count value
- amount
- measuring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H6/00—Emergency protective circuit arrangements responsive to undesired changes from normal non-electric working conditions using simulators of the apparatus being protected, e.g. using thermal images
- H02H6/005—Emergency protective circuit arrangements responsive to undesired changes from normal non-electric working conditions using simulators of the apparatus being protected, e.g. using thermal images using digital thermal images
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
- H03K17/082—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit
- H03K17/0824—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit in thyristor switches
-
- 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
- H02H7/0833—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 for electric motors with control arrangements
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
- H03K2017/0806—Modifications for protecting switching circuit against overcurrent or overvoltage against excessive temperature
Landscapes
- Protection Of Static Devices (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates to a switch of controlling motor power of electric hand tool, which comprises power supply connection, motor connection, controllable semiconductor between the motor connection and the power supply connection, control circuit of the semiconductor, and safety circuit. Wherein, the switch includes a summation circuit which is suitable for repeatedly measuring amount in the switch or nearby, distributing counting value to the measure value of the amount, cumulating the counting value, and producing signals after the cumulated counting value reaching preconcerted value. The evaluation of state relating to components quality includes foregone process of the components.
Description
Technical field
The present invention relates to a kind of switch that to present to the power of the motor of electric hand-tool that is used to control, comprising that power supply connects, motor connects, be connected that motor connects and the controllable semiconductor of power supply between connecting, be used for control this semi-conductive control circuit and safety circuit.
Background technology
Such switch is a common general knowledge.At this, the purpose of safety circuit is assembly such as the semiconductor or the switch contact site of protection switch, in case it is owing to unfavorable condition of work receives damage as too big electric current or too high temperature.Such safety circuit is suitable for measuring such amount and generates signal when this amount surpasses predetermined value.Can obtain enough protections under many circumstances thus.Also depend in the breaking-up to the excessive wear of assembly or damage or assembly under the condition of nearest historical events of this assembly, such safety circuit can not work fast enough to prevent such situation of not expecting.The present invention attempts to provide a kind of safety circuit of avoiding these shortcomings.
Summary of the invention
This purpose realizes by such switch, wherein this switch comprises summation circuit, this summation circuit is suitable for there be (prevailing) in duplicate measurements in switch or in its vicinity amount, distribute count value with measured value to this amount, accumulate this count value, and when the count value of accumulation reaches predetermined value, generate signal.
Because these measures, in assessment, comprised the previous history of this assembly to the situation of the quality that whether jeopardizes assembly.
This measure is not only applicable to form the assembly such as the semiconductor of the part of switch itself at this, and is applicable to the assembly that is directly connected to switch, as motor or the battery under the battery-powered situation of electric power tool.Under the situation of battery, history is the key factor in the monitoring quality really recently.
Notice that at this present invention can be applied to the situation by the alternating current instrument of network supply and battery-powered direct current instrument.
The invention still further relates to a kind of relevant method and be equipped with electric power tool according to switch of the present invention.
According to first embodiment, summation circuit is suitable for measuring will be by the amount of transient measurement.This causes the simple configuration of measuring, and makes simple sample circuit can be used for measuring this instantaneous value.
Alternatively, summation circuit is suitable on a time period measured amount being carried out integration.Because integration causes better simulation, so this will cause higher accuracy.Certainly, this embodiment needs more complicated analog circuit to implement integration, but makes it be able to the part compensation at least to the low requirement of measuring frequency.Certainly, integration can carry out in numeric field, but this will cause measuring system and the measuring system of carrying out more frequent transient measurement that a lot of something in commons are arranged.
Under latter instance, summation circuit can be suitable on the different mutually time periods measured amount being carried out integration.This allows the time period to be adapted to the quality of measuring amount, for example when gradient occurring, thereby improves accuracy.Is important with integral result divided by the relevant time period.
According to another embodiment, when measuring-signal during greater than first predetermined value of measuring amount, count value equal to fix on the occasion of, and when measured value during, the negative value that count value equals to fix less than first predetermined value of measuring amount.This is a simple embodiment structurally, and its requirement to circuit is very low, if perhaps this function is implemented in the programmable calculator such as microprocessor, its requirement to computer or software is very low, and therefore the cost price of such circuit is low.
Another preferred embodiment provides such measure: when measuring-signal during greater than first predetermined value of measuring amount, count value equal to fix on the occasion of, when measured value during less than second predetermined value of measuring amount, the negative value that count value equals to fix, and when measuring-signal was between first and second count values, count value was zero.Obtain the simulation more accurately to a certain extent than last embodiment thus, still the requirement to required device is not very manyly high.
The embodiment measure that provides the absolute value of positive and negative count value to be equal to each other more specifically to a certain extent.This will cause even bigger simplification.
But an alternative embodiment provides the measure of the absolute value of forward counting value greater than the absolute value of negative count value.By this measure, the particular characteristics of protected one or more assemblies to be incorporated in the simulation.Its example is the temperature of assembly.The electric current of determining comes heating component with definite speed or with the temperature increase of determining.When not having electric current to flow through, assembly will be to be cooled off by the determined speed of ambient environmental conditions.The speed that these conditions make temperature reduce usually is lower than the speed that temperature raises owing to the electric current of determining.Described measure will be taken this phenomenon into account.
Yet the absolute value of forward counting value also is possible less than the absolute value of negative count value.Adopt this measure to take the situation of the one or more assemblies that are used to protect into account.
Continue foregoing example, the temperature of assembly is raising sooner under than the situation at low current under the situation of high electric current.This effect equals the predetermined value of measured value and measuring amount by count value the measure of difference alleviates.This is to depend on measured value because the gradient of count value and accumulated value thus becomes in view of the above.
Another embodiment provides switch to be suitable for the measure of measuring with fixing interval.Required circuit has also been simplified in this measure, when it is assembled by specific components and when its function is implemented in microprocessor, is not always the case.
Alternatively, another embodiment proposed switch be suitable for after measuring, when the time period that depends on the value of during first measures, measuring in the past after, the follow-up measurement that is right after.Though because the gradient of accumulated value depends on the value of measuring amount after all and improved simulation thus, the measuring frequency that changes needs more electronic installation.
According to an embodiment more specifically, the time period between follow-up measurement of measuring and being right after is with proportional in first value of measuring during measuring.This measure also causes the simulation that improves.
For it is long-pending to prevent insignificant burden, just switch is suitable for having only when accumulated value and reduces accumulated value to bear count value greater than zero the time.
But have a plurality of measuring amount near switch, it can be used as the indication of situation that convergence may influence the quality of the assembly of switch or connected assembly unfriendly.Here can use electric current, particularly flow through the semi-conductive electric current or the common current of electric corresponding of switch with it.This electric current causes the heating in the semiconductor after all, and this can cause shortening the temperature in semiconductor life-span.In battery-powered instrument, can also measure battery current.This battery current is for battery status and the most important amount of its quality after all.Particularly but whether exclusively, be exactly like this for lithium ion battery.In battery, the accumulated current value can be used for the charged state of battery is simulated in addition, and wherein the charged state of battery is important for the work of optimizing battery.
Yet, also can utilize temperature as amount.The temperature relevant with semi-conductive state is the temperature of semiconductor crystal.Yet for temperature survey, this is not easy to obtain.By measuring other local temperature, for example, be connected to semiconductor crystal coldplate temperature and utilize according to cumulative measurement of the present invention, can obtain suitable estimation, thereby can reduce power or stopcock at reasonable time to crystal temperature effect.Similar consideration is applicable to the battery temperature about battery cell temperature.Also can measure other amount in addition, as relative humidity in the switch housing or voltage.
The essential condition that is used to improve electrical machinery life is a motor temperature.According to a preferred embodiment, measuring amount is the temperature that is connected to the motor of switch.Point out at this, therefore not only be suitable for protecting the assembly of the part that forms switch itself, and be suitable for assembly such as motor, battery, contact site or the heater element of protection switch outside according to switch of the present invention.
The measure of having been taked when the stored counts value has reached predetermined value can be limited to and only generates warning signal, still, operative scenario can also be modified to the situation that has reduced load.Can also stopcock.
Favourable measure is to be provided with more than a rank, wherein takes different measures in different ranks.Therefore for example can when reaching first rank of stored counts value, reduce the power of switch, and when reaching the second level of stored counts value stopcock.At this, play a kind of effect of protection in the measure of second level.
Description of drawings
Hereinafter with reference to description of drawings the present invention, wherein:
Fig. 1 shows the principal current figure that has according to the electric power tool of the switch of first embodiment;
Fig. 2 shows the principal current figure that has according to the electric power tool of the switch of second embodiment;
Fig. 3 shows the figure of explanation according to the operation of switch of the present invention;
Fig. 4 show variant of the present invention with the corresponding figure of Fig. 3; And
Fig. 5 show another variant of the present invention with Fig. 3 and 4 corresponding figure.
Embodiment
Fig. 1 shows the circuit such as the electric hand-tool of rig.This circuit is included in it on the whole with 2 switch, the connection 3 that is used for network supply and the motors of representing 4.Switch 2 comprises that semiconductor element 5 is as thyristor and mechanical switch 6.Motor 4, thyristor 5, mechanical switch 6 and network supply connect in the mode of the switch of prior art connects.Switch 2 also comprises control circuit 7.These parts of described switch form the part of prior art heretofore.
The invention provides the setting of current measurement device 8 and summation circuit 9, wherein current measurement device 8 for example is the form with resistor of low ohm value.Summation circuit 9 is suitable for repeating the measurement of the electric current of convection current overcurrent measuring component 8; In other words, this electric current is sampled.Then, this sampled value of Huo Deing converts count value to by summation circuit 9 like this, can adopt the algorithm that will illustrate below for this purpose.The count value of Huo Deing is accumulated in summation circuit 9 like this, and when reaching predetermined accumulated value, summation circuit 9 generates signals to control circuit 7, and for example control circuit is used for stopcock or control semiconductor 5 makes that flowing through this semi-conductive electric current reduces for this.Do not get rid of other operation yet.
By way of parenthesis, should be noted that this measurement is recurrent operation.Need take the periodicity of the switching manipulation of thyristor into account at this, this periodically depends on the frequency of network supply, so as to prevent owing to always measure with identical phase place with interference sample synchronously.
Yet also possible is that summation circuit 9 is suitable for during specific short time period electric current being carried out integration, and this value and predetermined value are compared.Preferably, adopt with electric current is carried out integration and measurement during the identical time period, but also difference mutually of these time periods, this can be compensated in next process, for example with integrated value divided by the time period of carrying out integration.
The foregoing description relates to the instrument by network supply, and wherein summation circuit is suitable for measuring the electric current that flows through semiconductor and motor.Fig. 2 shows the embodiment that is suitable for by the rechargeable battery power supply, has wherein measured temperature but not electric current.Therefore, interlock circuit comprises battery unit 10 and temperature sensor 12, and wherein battery unit 10 is incorporated a plurality of battery units 11 into, and temperature sensor 12 is used for the temperature of measuring unit 11.In this embodiment, summation circuit also is suitable for carrying out the algorithm that will illustrate below.Though power network frequency is not the factor in this circuit, the semiconductor 4 for example switching frequency of GTO or FET is a correlative factor.
The operation of the summation circuit 9 in two circuit that illustrate in front is discussed with reference to Fig. 3.Fig. 3 A is shown here measures the curve chart of electric current.Correlated current is periodically measured or in fact is sampled, and the sampled value that obtains like this is converted into count value, shown in Fig. 3 B.In this example, this count value obtains according to measured value by utilizing the reference current value shown in Fig. 3 A.When measuring electric current, distribute the forward counting value, and when measuring electric current, distribute negative count value less than this reference current value greater than reference current value.In this example, the absolute value of positive and negative count value is identical.The count value of Xing Chenging is accumulated like this, shown in Fig. 3 C.In this supposition, accumulated value is the tolerance to semi-conductive unfavoured state, in this example for flow through the semi-conductive temperature that semiconductor causes owing to electric current.When accumulated value reaches predetermined value, operate like that as already explained, for example switch is turned off.In addition, also can utilize the integration of wanting measured amount of incorporating this measurement into.
The sample frequency that the present embodiment utilization is fixing; Yet, also can utilize variable sample frequency, for example depend on the sample frequency of measured value.Under such situation, the time period between measurement and the follow-up measurement depends on measured value.Measured value rushes into extremes more-and this is the indication of dynamic behaviour after all, and is generally that the selected time period until follow-up measurement is short more at this.
Fig. 4 shows the embodiment that count value not only can be taked the plus or minus value but also can take null value.In some cases, can obtain better simulation thus to phenomenon.
Fig. 5 shows the embodiment with variable sampling at last; When measured value surpassed predetermined value, the time period between the sampling reduced by half.
Should be understood that have numerous other possibilities of the algorithm of being carried out by summation circuit, it also is dependent on the application and the dynamic behaviour of the amount of wanting monitored.
Claims (23)
1. be used for the switch controlled to the power of the motor of electric hand-tool presenting, it comprises
-power supply connects;
-motor connects;
-be connected that described motor connects and the controllable semiconductor of described power supply between connecting;
-be used to control described semi-conductive control circuit; And
-safety circuit,
It is characterized in that described switch comprises summation circuit, described summation circuit is suitable for:
--the amount that duplicate measurements exists in described switch or in its vicinity;
--the measured value to described amount distributes count value;
--accumulate described count value; And
--when reaching predetermined value, the count value of accumulation generates signal.
2. switch as claimed in claim 1 is characterized in that described summation circuit is suitable for transient measurement and wants measured amount.
3. switch as claimed in claim 1 is characterized in that described summation circuit is suitable on a time period measured amount being carried out integration.
4. switch as claimed in claim 2 is characterized in that described summation circuit is suitable on the mutually different time periods measured amount being carried out integration, and with integral result divided by the relevant time period.
5. each described switch in the claim as described above, it is characterized in that when measured signal during greater than first predetermined value of described measuring amount, described count value equal to fix on the occasion of, and when described measured value during, the negative value that described count value equals to fix less than described first predetermined value of described measuring amount.
6. as each the described switch among the claim 1-4, it is characterized in that when measured signal during greater than first predetermined value of described measuring amount, described count value equal to fix on the occasion of, when described measured value during less than second predetermined value of described measuring amount, the negative value that described count value equals to fix, and when measured signal was between described first and second count values, described count value was zero.
7. as claim 5 or 6 described switches, it is characterized in that the absolute value of described positive and negative count value is equal to each other.
8. as claim 5 or 6 described switches, it is characterized in that the absolute value of the absolute value of described forward counting value greater than described negative count value.
9. as claim 5 or 6 described switches, it is characterized in that the absolute value of the absolute value of described forward counting value less than described negative count value.
10. as each the described switch among the claim 1-4, it is characterized in that described count value equals predetermined value poor of described measured value and described measuring amount.
11. the described switch of each in the claim is characterized in that described switch is suitable for measuring with fixing interval as described above.
12. as each the described switch among the claim 1-10, it is characterized in that described switch be suitable for after measuring, when the time period that depends on the value of during first measures, measuring in the past after, the follow-up measurement that is right after.
13. switch as claimed in claim 12 is characterized in that the time period between the follow-up measurement of measuring and being right after is proportional with the value of measuring during first measurement.
14. the described switch of each in the claim as described above is characterized in that described switch only is suitable for reducing described accumulated value with negative count value when described accumulated value greater than zero the time.
15. the described switch of each in the claim is characterized in that described measuring amount is the electric current of described switch inside as described above.
16., it is characterized in that described measuring amount is in the inner temperature that exists of described switch as each the described switch among the claim 1-14.
17., it is characterized in that described measuring amount is the temperature that is connected to the battery of described switch as each the described switch among the claim 1-14.
18., it is characterized in that described measuring amount is the temperature that is connected to the described motor of described switch as each the described switch among the claim 1-14.
19. the described switch of each in the claim as described above is characterized in that described switch is suitable for reducing presenting power to described motor by described switch when generating signal with the first stored counts value.
20. the described switch of each in the claim is characterized in that described switch is suitable for turn-offing described switch when generating signal with the second stored counts value as described above.
21. the combination of switch as claimed in claim 17 and battery.
22. electric hand-tool is characterized in that each the described switch in the claim as described above.
23. be used for the method for console switch, described switch is used to control the power that will present to the motor of electric hand-tool, wherein said method may further comprise the steps:
--the amount that duplicate measurements exists in described switch or in its vicinity;
--the measured value to described amount distributes count value;
--accumulate described count value; And
--when reaching predetermined value, the count value of accumulation generates signal.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL2000144 | 2006-07-14 | ||
| NL2000144A NL2000144C2 (en) | 2006-07-14 | 2006-07-14 | Switch for electric hand tools with cumulative protection function. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101119111A true CN101119111A (en) | 2008-02-06 |
Family
ID=37845373
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101368538A Pending CN101119111A (en) | 2006-07-14 | 2007-07-16 | Switch used for electric hand-tool and having cumulating property safety function |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN101119111A (en) |
| NL (1) | NL2000144C2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102859823A (en) * | 2010-04-21 | 2013-01-02 | 株式会社牧田 | Device for estimating internal temperature of battery for power tool, and device for power tool |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4413213A (en) * | 1981-11-04 | 1983-11-01 | Reliance Electric Company | Electronic motor protection for variable speed motors |
| DE9114599U1 (en) * | 1991-11-23 | 1992-03-12 | Gretsch-Unitas Gmbh Baubeschlaege, 7257 Ditzingen, De | |
| US5305234A (en) * | 1991-12-31 | 1994-04-19 | Westinghouse Electric Corp. | Thermal protection apparatus for a synchronous machine |
-
2006
- 2006-07-14 NL NL2000144A patent/NL2000144C2/en not_active IP Right Cessation
-
2007
- 2007-07-16 CN CNA2007101368538A patent/CN101119111A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102859823A (en) * | 2010-04-21 | 2013-01-02 | 株式会社牧田 | Device for estimating internal temperature of battery for power tool, and device for power tool |
| CN102859823B (en) * | 2010-04-21 | 2015-04-01 | 株式会社牧田 | Device for estimating internal temperature of battery for power tool, and device for power tool |
| US9186787B2 (en) | 2010-04-21 | 2015-11-17 | Makita Corporation | Internal temperature estimation unit for battery for electric power tool, and apparatus for electric power tool |
Also Published As
| Publication number | Publication date |
|---|---|
| NL2000144C2 (en) | 2008-01-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102064597B (en) | Energy storage device | |
| EP0990167B1 (en) | Battery measuring terminal | |
| US4721894A (en) | Temperature monitor system for an intermittent duty wound field motor | |
| CN110018349A (en) | Ground fault detection device | |
| KR20020044170A (en) | Shunt resistance device for monitoring battery state of charge | |
| US10587146B2 (en) | Power dissipation monitoring and load management | |
| WO2005078673A1 (en) | Remote battery monitoring system having embedded telesensors | |
| US8310120B2 (en) | System and method for monitoring health of electrical machines | |
| JP2016524158A (en) | Measurement of element resistance in watt-hour meter | |
| US7268532B2 (en) | Apparatus and method for calculating offset value for an electric sensor | |
| CN204142833U (en) | A kind of monitoring device of generator carbon brush electric current | |
| CN109765431B (en) | Resistance measuring circuit, temperature detection circuit and rifle that charges | |
| JP2017223641A (en) | Apparatus and method for providing measurements of uncertainty in respect of transfer function | |
| CN103460058A (en) | Method for contactless determination of electrical potential of object using two different values for electric flux, and device | |
| SE518250C2 (en) | Device and system for monitoring one or more conductors connected to an electric power grid | |
| US20020109507A1 (en) | In-service testing of current transformers | |
| CN111910188A (en) | Full-intelligent testing device and testing pile for cathode protection of buried steel pipeline | |
| GB2566308A (en) | Battery management system | |
| US20130187389A1 (en) | Method for predictive monitoring of switch contactors and system therefor | |
| CN101119111A (en) | Switch used for electric hand-tool and having cumulating property safety function | |
| KR20090130992A (en) | The electrical device with sensor for temperature | |
| RU2377581C1 (en) | Method of measurement and monitoring of insulation resistance of unearthed power electrical ac networks under operation voltage and device for its implementation | |
| KR101024628B1 (en) | Electronic watt-hour meter | |
| CN115932703A (en) | Verifying metering accuracy of electric meter | |
| KR200217828Y1 (en) | Nobreak power supply changable Watt-meter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20080206 |