CN101710693A - Micromotor protective circuit, search lamp control device and micromotor excess flow control method - Google Patents
Micromotor protective circuit, search lamp control device and micromotor excess flow control method Download PDFInfo
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- CN101710693A CN101710693A CN 200910109985 CN200910109985A CN101710693A CN 101710693 A CN101710693 A CN 101710693A CN 200910109985 CN200910109985 CN 200910109985 CN 200910109985 A CN200910109985 A CN 200910109985A CN 101710693 A CN101710693 A CN 101710693A
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Abstract
The invention belongs to the field of high-light search lamps and provides a micromotor protective circuit, a search lamp control device and a micromotor excess flow control method; the micromotor protective circuit comprises a sampling circuit and a singlechip, the sampling circuit comprises a comparing unit, and a current-limiting resistance R4 and a sampling resistance R3 which are sequentially connected between the non-inverting input end and the ground of the comparing unit in series, a reference voltage generating unit which is connected with the inverting input end of the comparing unit and a filter capacitor C13 which is connected between the non-inverting input end of the comparing unit and the ground; the output end of the comparing unit is used as the output end of the sampling circuit and is connected with the singlechip, and the serial connection end of the current-limiting resistance R4 and the sampling resistance R3 is used as the input end of the sampling circuit and is connected with the micromotor; the micromotor protective circuit has strong anti-jamming capability and high reliability.
Description
Technical field
The invention belongs to the highlight searching lamp field, relate in particular to electrical micro-machine protective circuit, search lamp control device and electrical micro-machine and cross method of flow control.
Background technology
Electrical micro-machine is when resistance commentaries on classics state, and electric current can become greatly, and electrical micro-machine can cause shorten the useful life of electrical micro-machine because of the heat of the excessive generation of electric current, even burns.Therefore, must the electric current of electrical micro-machine be limited, thereby reach the purpose of protecting electrical micro-machine; Because when electrical micro-machine normally starts; immediate current can be very big; continue to recover normal behind about hundreds of millisecond; starting current is bigger tens times than running current; so in the protection of prior art to electrical micro-machine, thereby generally adopt electrochemical capacitor charging carrying out voltage to rise to judge it is electric motor rotation resistant or starting state.
Fig. 1 shows the circuit structure of the electrical micro-machine protective circuit that prior art provides, and when electrical micro-machine was opened, power supply POWER provided supply power voltage, and electric current flows through sampling resistor R2 through electrical micro-machine 11 and flows back to power supply POWER then.Sampling resistor R2 will be behind the current sample of electrical micro-machine 11 outflows, through behind the current limliting R1 capacitor C 1 being charged, the voltage at capacitor C 1 two ends rises gradually, when the voltage at capacitor C 1 two ends is higher than the 5V reference voltage, comparator output redirect control signal, to electrical micro-machine control circuit 12 output electrical micro-machine over-current signals, electrical micro-machine control circuit 12 cuts out electrical micro-machine 11.Capacitor C 1 is charged to time of 5V must be greater than the start-up time of electrical micro-machine 11.
Wherein, capacitor C 1 can be selected solid-state tantalum electric capacity or electrochemical capacitor for use, because the capacity of solid-state tantalum electric capacity is less, and price is expensive, and is inapplicable, therefore generally selects electrochemical capacitor for use.Yet electrochemical capacitor is after work 2,000 hours, and electrolyte can dry-out slowly occur, and capacity diminishes, and as time passes, it is unstable that the Circuits System of electrical micro-machine 11 will become, and the phenomenon that electrical micro-machine 11 can't be opened occurs; And the electrochemical capacitor volume is big, is unfavorable for dwindling the circuit board size.
Summary of the invention
The object of the present invention is to provide a kind of electrical micro-machine protective circuit, be intended to solve existing electrical micro-machine protective circuit unstable properties, problem that the circuit board size is big.
The embodiment of the invention is achieved in that a kind of electrical micro-machine protective circuit, and described electrical micro-machine protective circuit comprises: sample circuit, and its input is connected with electrical micro-machine, and the operating current of described electrical micro-machine is sampled; And single-chip microcomputer, it is connected with the output of described sample circuit, according to the output of described sample circuit the overcurrent time is detected, and when detected overcurrent time during greater than normal start-up time of described electrical micro-machine, controls described electrical micro-machine and quits work; Described sample circuit comprises: comparing unit, be connected in series in the in-phase input end of described comparing unit and current-limiting resistance R4 between the ground and sampling resistor R3 successively, be connected the reference voltage generation unit of the inverting input of described comparing unit, and be connected the in-phase input end of described comparing unit and the filter capacitor C13 between the ground; The output of described comparing unit is connected with described single-chip microcomputer as the output of described sample circuit; Described current-limiting resistance R4 holds the input as described sample circuit to be connected with described electrical micro-machine with being connected in series of described sampling resistor R3.
Further, described comparing unit comprises: comparator and feedback resistance R8, the in-phase input end of described comparator is by described filter capacitor C13 ground connection, the in-phase input end of described comparator also is connected with described electrical micro-machine by described current-limiting resistance R4, and the in-phase input end of described comparator also is connected to the output of described comparator by described feedback resistance R8; The inverting input of described comparator connects described reference voltage generation unit; Power supply termination first voltage of described comparator, the ground end ground connection of described comparator.
Further, described reference voltage generation unit comprises: the adjustable voltage-stabiliser tube of voltage, divider resistance R5, divider resistance R7 and be connected in series in current-limiting resistance R9 and filter capacitor C5 between second voltage and the ground; One end of the adjustable voltage-stabiliser tube of described voltage is connected to the end that is connected in series of described current-limiting resistance R9 and described filter capacitor C5, the other end ground connection of the adjustable voltage-stabiliser tube of described voltage, described divider resistance R7 and the described divider resistance R5 ground connection of the output of the adjustable voltage-stabiliser tube of described voltage by being connected in series successively; The end that is connected in series of described divider resistance R7 and described divider resistance R5 is connected to the inverting input of described comparator.
Further, the adjustable voltage-stabiliser tube of described voltage is the TL431 chip.
Further, described sample circuit also comprises: be connected in series in output and the resistance R between the ground 10 and the resistance R 11 of described comparator successively, described resistance R 10 is connected with described single-chip microcomputer with the end that is connected in series of described resistance R 11.
Another purpose of the embodiment of the invention is to provide a kind of search lamp control device; it comprises: the electrical micro-machine protective circuit; light source switch circuit, remote-control receiving circuit, line control circuit and the electrical micro-machine that is connected with described electrical micro-machine protective circuit respectively, described electrical micro-machine protective circuit is above-mentioned electrical micro-machine protective circuit.
Another purpose of the embodiment of the invention is to provide a kind of electrical micro-machine of above-mentioned electrical micro-machine protective circuit that adopts to cross method of flow control, comprises the steps:
Gather the input current of electrical micro-machine in real time, and described input current and predetermined current are compared, when described input current surpasses predetermined current, the output sampled signal;
When single-chip microcomputer receives described sampled signal, start timing;
Judge that timing whether less than default electrical micro-machine start-up time, if not, then is judged to be the electrical micro-machine overcurrent, quit work by the Single-chip Controlling electrical micro-machine.
Electrical micro-machine protective circuit provided by the invention adopts single-chip microcomputer that the overcurrent time of electrical micro-machine is detected, and when detected overcurrent time during greater than normal start-up time of electrical micro-machine, the control electrical micro-machine quits work, and the protection electrical micro-machine is not damaged; Can judge the overcurrent time accurately, the startup or the resistance of accurate control control electrical micro-machine are changeed, and antijamming capability is strong, the reliability height; In addition owing to adopt adjustable reference voltage, and Single Chip Microcomputer (SCM) program repeat write, make the electrical micro-machine protective circuit more be applicable in the electrical micro-machine of various different models, improved reliability of products, enlarged the scope of application, be convenient to the modularization of circuit board.
Description of drawings
Fig. 1 is the electrical block diagram of the electrical micro-machine protective circuit that provides of prior art;
Fig. 2 is the modular structure schematic diagram of the search lamp control device that provides of the embodiment of the invention;
Fig. 3 is the circuit diagram of the electrical micro-machine protective circuit that provides of the embodiment of the invention;
Fig. 4 is the workflow diagram that electrical micro-machine that the embodiment of the invention provides is crossed method of flow control.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Electrical micro-machine protective circuit provided by the invention adopts single-chip microcomputer that the overcurrent time of electrical micro-machine is judged, can judge the overcurrent time accurately, thereby startup or the resistance of controlling electrical micro-machine are accurately changeed; Antijamming capability is strong, the reliability height.
The modular structure of the search lamp control device that the embodiment of the invention provides for convenience of explanation, only shows the part relevant with the embodiment of the invention as shown in Figure 2, and details are as follows.
Search lamp control device comprises: power circuit 21, light source switch circuit 22, remote-control receiving circuit 25, line control circuit 29, electrical micro-machine 26 and electrical micro-machine protective circuit, and wherein the electrical micro-machine protective circuit comprises: single-chip microcomputer 27 and sample circuit 28; The input of sample circuit 28 is connected with electrical micro-machine 26, and the operating current of electrical micro-machine 26 is sampled; Single-chip microcomputer 27 is connected with the output of sample circuit 28, according to the output of sample circuit 28 the overcurrent time is detected, and when detected overcurrent time during greater than normal start-up time of electrical micro-machine 26, control electrical micro-machine 26 quits work; Power circuit 21 is used to other circuit that working power is provided; The output of light source switch circuit 22 connects ballast 23, the output of ballast 23 connects lamp 24, the control end of light source switch circuit 22 is connected to the output of single-chip microcomputer 27, the input of remote-control receiving circuit 25 receives outside remote signal, the output of remote-control receiving circuit 25 is connected to the input of single-chip microcomputer 27, the output of line control circuit 29 is connected to the input of single-chip microcomputer 27, the control signal of the remote signal of the outside that receives according to remote-control receiving circuit 25 or line control circuit 29 outputs, single-chip microcomputer 27 output control signals are given light source switch circuit 22, light source switch circuit 22 control ballasts 23, ballast 23 is controlled opening or closing of lamps 24.
In embodiments of the present invention, " overcurrent " is for the running current of electrical micro-machine 26, generally than running current more than big ten times; When electrical micro-machine 26 normal startups, electrical micro-machine 26 from static to normal rotation during this period of time in, the electric current of the electric current of electrical micro-machine during greater than normal rotation, can define so: be " overcurrent time " from electrical micro-machine is static during this period of time to what electrical micro-machine ran well, promptly electrical micro-machine surpasses the time of normal rotation electric current.
In embodiments of the present invention, the physical circuit figure of electrical micro-machine protective circuit because single chip circuit belongs to prior art, is not described in detail in this as shown in Figure 3, for convenience of explanation, only shows the physical circuit figure of sample circuit 28, and details are as follows.
As one embodiment of the present of invention, comparing unit 281 comprises: comparator U5A and feedback resistance R8, the in-phase input end of comparator U5A+by filter capacitor C13 ground connection wherein, the in-phase input end of comparator U5A+also is connected with electrical micro-machine 26 by current-limiting resistance R4, the in-phase input end of comparator U5A+also be connected to by the feedback resistance R8 output of comparator; The inverting input of comparator U5A-connection reference voltage generation unit 282; The power supply termination first voltage VCC of comparator U5A, the ground end ground connection of comparator U5A.
In embodiments of the present invention, reference voltage generation unit 282 comprises: voltage is adjustable voltage-stabiliser tube U8, divider resistance R5, divider resistance R7 and be connected in series in second voltage (+5V) and current-limiting resistance R9 between the ground and filter capacitor C5; The input of voltage is adjustable voltage-stabiliser tube U8 is connected to the end S2 that is connected in series of current-limiting resistance R9 and filter capacitor C5, divider resistance R7 and the divider resistance R5 ground connection of output of voltage is adjustable voltage-stabiliser tube U8 by being connected in series successively, the ground end ground connection of voltage is adjustable voltage-stabiliser tube U8; The end S3 that is connected in series of divider resistance R7 and divider resistance R5 be connected to the inverting input of comparator U5A-.
As one embodiment of the present of invention, voltage is adjustable, and voltage-stabiliser tube U8 can be the TL431 chip.
In embodiments of the present invention, sample circuit 28 also comprises: be connected in series in the output of comparator U5A and divider resistance R10 between the ground and divider resistance R11 successively, wherein, divider resistance R10 is connected with single-chip microcomputer 27 with the end S4 that is connected in series of divider resistance R11; Because the voltage of comparator U5A output is generally 12V; and the voltage of the I/O mouth of single-chip microcomputer 27 generally is lower than 5V; so adopting the divider resistance R10 and the divider resistance R11 that are connected in series is the required voltage of I/O mouth of single-chip microcomputer 27 with the voltage transitions that comparator U5A exports, protection single-chip microcomputer 27 can not burnt.
Compared with prior art; the electrical micro-machine protective circuit that the embodiment of the invention provides does not re-use electrochemical capacitor; but adopt single-chip microcomputer to calculate the overcurrent time; by sample circuit 28 sampling electrical micro-machine input currents; thereby calculate electrical micro-machine 26 from static this section " overcurrent time " that runs well to electrical micro-machine 26; utilize single-chip microcomputer 27 to calculate the overcurrent time and can judge the overcurrent time more accurately; solved the problem that the electrochemical capacitor volume is unfavorable for dwindling the circuit board size greatly; antijamming capability is strong simultaneously, the reliability height.
In order to illustrate further the electrical micro-machine protective circuit that the embodiment of the invention provides, it is as follows now in conjunction with Fig. 3 in detail its operation principle to be described in detail:
Single-chip microcomputer 27 output electrical micro-machine working control signal, electrical micro-machine 26 starts, there is electric current to pass through on the sampling resistor R3, the sampled voltage at sampling resistor R3 two ends input to after through current-limiting resistance R4 current limliting the in-phase input end of comparator U5A+, and the inverting input of comparator U5A-a connect reference voltage, this reference voltage is by one tunnel+5V power supply process current-limiting resistance R9 current limliting, after the adjustable voltage-stabiliser tube U8 of overvoltage voltage stabilizing, provides after process divider resistance R7 and the divider resistance R5 dividing potential drop more then.
Be T1 the start-up time of adopting single-chip microcomputer 27 that electrical micro-machine 26 is set, for convenience of explanation, the electrical micro-machine T1 26 start-up time that can define single-chip microcomputer 27 settings is threshold time T1, and in order to prevent misoperation, this threshold time T1 should be greater than the actual normal start-up time of electrical micro-machine 26.When electrical micro-machine 26 work, the overcurrent time T 2 in 27 pairs of reality of single-chip microcomputer detects, and when detected overcurrent time T 2 during less than threshold time T1, then single-chip microcomputer 27 is judged as the starting current of electrical micro-machine 26, electrical micro-machine 26 operate as normal; When detected overcurrent time T 2 during greater than threshold time T1; then single-chip microcomputer 27 is judged as electrical micro-machine 26 overcurrents; outer mechanical resistance commentaries on classics has promptly taken place (to be blocked by other objects in electrical micro-machine 26 rotating process; change motionless; be equivalent to external force and hinder its rotation), the electrical micro-machine protective circuit will be sent the overcurrent control signal, is quit work by single-chip microcomputer 27 control electrical micro-machines 26; under the situation that outer mechanical resistance commentaries on classics has taken place, electrical micro-machine 26 is protected.
In embodiments of the present invention, be connected the inverting input of comparator U5A-the adjusting that can adapt of the reference voltage that produces of reference voltage generation unit 282 according to the electrical micro-machine 26 of different model, the scope of application is wide, can be applied in electrical micro-machine 26 circuit of different model.
The electrical micro-machine that Fig. 4 shows the embodiment of the invention to be provided is crossed the workflow of method of flow control, for convenience of explanation, only shows the part relevant with the embodiment of the invention, and details are as follows.
Electrical micro-machine is crossed method of flow control and be may further comprise the steps:
The first step, gather the input current of electrical micro-machine in real time, and described input current and predetermined current are compared, when described input current surpasses predetermined current, the output sampled signal;
Second step, when single-chip microcomputer receives sampled signal, start timing;
The 3rd goes on foot, judges that timing whether less than default electrical micro-machine start-up time, if not, then is judged to be the electrical micro-machine overcurrent, is quit work by the Single-chip Controlling electrical micro-machine; If then be judged to be electrical micro-machine and normally start, not execute protection action.The above-mentioned first step is realized by above-mentioned electrical micro-machine protective circuit in embodiments of the present invention.
Electrical micro-machine protective circuit that the embodiment of the invention provides adopts single-chip microcomputer that the overcurrent time of electrical micro-machine is detected, and when detected overcurrent time during greater than normal start-up time of electrical micro-machine, the control electrical micro-machine quits work, and the protection electrical micro-machine is not damaged; Can judge the overcurrent time accurately, the startup or the resistance of accurate control control electrical micro-machine are changeed, and antijamming capability is strong, the reliability height; In addition owing to adopt adjustable reference voltage, and Single Chip Microcomputer (SCM) program repeat write, make the electrical micro-machine protective circuit more be applicable in the electrical micro-machine of various different models, improved reliability of products, enlarged the scope of application, be convenient to the modularization of circuit board.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. an electrical micro-machine protective circuit is characterized in that, described electrical micro-machine protective circuit comprises:
Sample circuit, its input is connected with electrical micro-machine, and the operating current of described electrical micro-machine is sampled; And single-chip microcomputer, it is connected with the output of described sample circuit, according to the output of described sample circuit the overcurrent time is detected, and when detected overcurrent time during greater than normal start-up time of described electrical micro-machine, controls described electrical micro-machine and quits work;
Described sample circuit comprises: comparing unit, be connected in series in the in-phase input end of described comparing unit and current-limiting resistance R4 between the ground and sampling resistor R3 successively, be connected the reference voltage generation unit of the inverting input of described comparing unit, and be connected the in-phase input end of described comparing unit and the filter capacitor C13 between the ground;
The output of described comparing unit is connected with described single-chip microcomputer as the output of described sample circuit;
Described current-limiting resistance R4 holds the input as described sample circuit to be connected with described electrical micro-machine with being connected in series of described sampling resistor R3.
2. electrical micro-machine protective circuit as claimed in claim 1 is characterized in that, described comparing unit comprises:
Comparator and feedback resistance R8,
The in-phase input end of described comparator is by described filter capacitor C13 ground connection, the in-phase input end of described comparator also is connected with described electrical micro-machine by described current-limiting resistance R4, and the in-phase input end of described comparator also is connected to the output of described comparator by described feedback resistance R8;
The inverting input of described comparator connects described reference voltage generation unit;
Power supply termination first voltage of described comparator, the ground end ground connection of described comparator.
3. electrical micro-machine protective circuit as claimed in claim 2 is characterized in that, described reference voltage generation unit comprises:
The adjustable voltage-stabiliser tube of voltage, divider resistance R5, divider resistance R7 and be connected in series in current-limiting resistance R9 and filter capacitor C5 between second voltage and the ground;
One end of the adjustable voltage-stabiliser tube of described voltage is connected to the end that is connected in series of described current-limiting resistance R9 and described filter capacitor C5, the other end ground connection of the adjustable voltage-stabiliser tube of described voltage, described divider resistance R7 and the described divider resistance R5 ground connection of the output of the adjustable voltage-stabiliser tube of described voltage by being connected in series successively;
The end that is connected in series of described divider resistance R7 and described divider resistance R5 is connected to the inverting input of described comparator.
4. electrical micro-machine protective circuit as claimed in claim 3 is characterized in that, the adjustable voltage-stabiliser tube of described voltage is the TL431 chip.
5. electrical micro-machine protective circuit as claimed in claim 3 is characterized in that, described sample circuit also comprises:
Be connected in series in output and the resistance R between the ground 10 and the resistance R 11 of described comparator successively,
Described resistance R 10 is connected with described single-chip microcomputer with the end that is connected in series of described resistance R 11.
6. search lamp control device; it comprises: the electrical micro-machine protective circuit; light source switch circuit, remote-control receiving circuit, line control circuit and the electrical micro-machine that is connected with described electrical micro-machine protective circuit respectively; it is characterized in that described electrical micro-machine protective circuit is each described electrical micro-machine protective circuit of claim 1-5.
7. one kind is adopted the electrical micro-machine of each described electrical micro-machine protective circuit of claim 1-5 to cross method of flow control, it is characterized in that, comprises the steps:
Gather the input current of electrical micro-machine in real time, and described input current and predetermined current are compared, when described input current surpasses predetermined current, the output sampled signal;
When single-chip microcomputer receives described sampled signal, start timing;
Judge that timing whether less than default electrical micro-machine start-up time, if not, then is judged to be the electrical micro-machine overcurrent, quit work by the Single-chip Controlling electrical micro-machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910109985.0A CN101710693B (en) | 2009-11-03 | 2009-11-03 | Micromotor protective circuit, search lamp control device and micromotor excess flow control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910109985.0A CN101710693B (en) | 2009-11-03 | 2009-11-03 | Micromotor protective circuit, search lamp control device and micromotor excess flow control method |
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| CN101710693A true CN101710693A (en) | 2010-05-19 |
| CN101710693B CN101710693B (en) | 2014-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200910109985.0A Expired - Fee Related CN101710693B (en) | 2009-11-03 | 2009-11-03 | Micromotor protective circuit, search lamp control device and micromotor excess flow control method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102510046A (en) * | 2011-11-03 | 2012-06-20 | 宁波沪江电机有限公司 | Over-current protector for motor |
| CN102651545A (en) * | 2011-02-25 | 2012-08-29 | 海洋王照明科技股份有限公司 | Direct current motor lock-rotor protection circuit |
| CN103022968A (en) * | 2012-06-19 | 2013-04-03 | 华为技术有限公司 | Protection circuit, control method of protection circuit, telecommunication plug-in shelf device |
| CN103368142A (en) * | 2012-03-26 | 2013-10-23 | 海洋王照明科技股份有限公司 | Direct-current motor stalling protection circuit and search light |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101414747B (en) * | 2008-11-20 | 2010-12-01 | 宁波力达物流设备有限公司 | Overcurrent protective device for DC brush motor |
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2009
- 2009-11-03 CN CN200910109985.0A patent/CN101710693B/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102651545A (en) * | 2011-02-25 | 2012-08-29 | 海洋王照明科技股份有限公司 | Direct current motor lock-rotor protection circuit |
| CN102651545B (en) * | 2011-02-25 | 2014-08-06 | 海洋王照明科技股份有限公司 | Direct current motor lock-rotor protection circuit |
| CN102510046A (en) * | 2011-11-03 | 2012-06-20 | 宁波沪江电机有限公司 | Over-current protector for motor |
| CN102510046B (en) * | 2011-11-03 | 2014-11-19 | 宁波沪江电机有限公司 | Over-current protector for motor |
| CN103368142A (en) * | 2012-03-26 | 2013-10-23 | 海洋王照明科技股份有限公司 | Direct-current motor stalling protection circuit and search light |
| CN103368142B (en) * | 2012-03-26 | 2016-12-14 | 海洋王照明科技股份有限公司 | Direct current motor lock-rotor protection circuit and search lamp |
| CN103022968A (en) * | 2012-06-19 | 2013-04-03 | 华为技术有限公司 | Protection circuit, control method of protection circuit, telecommunication plug-in shelf device |
| WO2013189197A1 (en) * | 2012-06-19 | 2013-12-27 | 华为技术有限公司 | Protection circuit, control method therefor, and telecommunication subrack equipment |
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| CN101710693B (en) | 2014-03-12 |
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Granted publication date: 20140312 Termination date: 20181103 |