CN101710693B - 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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- CN101710693B CN101710693B CN200910109985.0A CN200910109985A CN101710693B CN 101710693 B CN101710693 B CN 101710693B CN 200910109985 A CN200910109985 A CN 200910109985A CN 101710693 B CN101710693 B CN 101710693B
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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 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 turns state, and electric current can become greatly, and electrical micro-machine can, because the heat of the excessive generation of electric current causes shorten the useful life of electrical micro-machine, even burn.Therefore, must limit the electric current of electrical micro-machine, thereby reach the object of protecting electrical micro-machine; While normally starting due to electrical micro-machine; immediate current can be very large; continue to recover normal after about hundreds of millisecond; large tens times than running current of starting currents; so prior art, in the protection of electrical micro-machine, is electric motor rotation resistant or starting state thereby generally adopt electrochemical capacitor charging to carry out voltage rising judgement.
Fig. 1 shows the circuit structure of the electrical micro-machine protective circuit that prior art provides, and when electrical micro-machine is opened, power supply POWER provide supply power voltage, and electric current flows through sampling resistor R2 through electrical micro-machine 11 and then flows back to power supply POWER.Sampling resistor R2 is by the current sample flowing out from electrical micro-machine 11, after current limliting R1, capacitor C 1 is charged, the voltage at capacitor C 1 two ends rises gradually, when the voltage at capacitor C 1 two ends is during higher than 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.The time that capacitor C 1 is charged to 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, because the capacity of solid-state tantalum electric capacity is less, and price, inapplicable, therefore generally select electrochemical capacitor.Yet electrochemical capacitor is after work 2,000 hours, and electrolyte can slowly occur dry-out, and capacity diminishes, and along with passage of time, it is unstable that the Circuits System of electrical micro-machine 11 will become, and occur the phenomenon that electrical micro-machine 11 cannot be opened; And electrochemical capacitor volume is large, be unfavorable for dwindling 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 circuit board size is large.
The embodiment of the present 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 the overcurrent time detecting is greater than the 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 successively the in-phase input end of described comparing unit and the current-limiting resistance R4 between ground and sampling resistor R3, be connected to the reference voltage generation unit of the inverting input of described comparing unit, and be connected to the in-phase input end of described comparing unit and the filter capacitor C13 between 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 is connected with described electrical micro-machine with the input of holding as described sample circuit that is 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 is also connected with described electrical micro-machine by described current-limiting resistance R4, and the in-phase input end of described comparator is also 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: voltage is adjustable voltage-stabiliser tube, divider resistance R5, divider resistance R7 and be connected in series in second voltage and ground between current-limiting resistance R9 and filter capacitor C5; The negative electrode 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 plus earth of the adjustable voltage-stabiliser tube of described voltage, the reference utmost point of the adjustable voltage-stabiliser tube of described voltage is by the described divider resistance R7 and the described divider resistance R5 ground connection that are connected in series successively; The inverting input that is connected to described comparator is held in being connected in series of described divider resistance R7 and described divider resistance R5.
Further, the adjustable voltage-stabiliser tube of described voltage is TL431 chip.
Further, described sample circuit also comprises: be connected in series in successively output and the resistance R between ground 10 and the resistance R 11 of described comparator, 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 object of the embodiment of the present invention is to provide a kind of search lamp control device; it comprises: electrical micro-machine protective circuit; the light source switch circuit, remote-control receiving circuit, line control circuit and the electrical micro-machine that are connected with described electrical micro-machine protective circuit respectively, described electrical micro-machine protective circuit is above-mentioned electrical micro-machine protective circuit.
Another object of the embodiment of the present 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:
The input current of Real-time Collection electrical micro-machine, and described input current and predetermined current are compared, when described input current surpasses predetermined current, output sampled signal;
When single-chip microcomputer receives described sampled signal, start timing;
Judge whether timing is less than default electrical micro-machine start-up time, if not, is judged to be electrical micro-machine overcurrent, by Single-chip Controlling electrical micro-machine, is quit work.
Electrical micro-machine protective circuit provided by the invention adopts single-chip microcomputer to detect the overcurrent time of electrical micro-machine, and when the overcurrent time detecting is greater than the normal start-up time of electrical micro-machine, control micro electric machine quits work, and protection electrical micro-machine is not damaged; Can judge accurately the overcurrent time, startup or the resistance of controlling accurately control micro electric machine turn, and antijamming capability is strong, and reliability is high; In addition owing to adopting adjustable reference voltage, and Single Chip Microcomputer (SCM) program repeat write, electrical micro-machine protective circuit is more suitable in the electrical micro-machine of various different models, improved the reliability of product, expanded the scope of application, be convenient to the modularization of circuit board.
Accompanying drawing explanation
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 present invention;
Fig. 3 is the circuit diagram of the electrical micro-machine protective circuit that provides of the embodiment of the present invention;
Fig. 4 is the workflow diagram that electrical micro-machine that the embodiment of the present invention provides is crossed method of flow control.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Electrical micro-machine protective circuit provided by the invention adopts single-chip microcomputer to judge the overcurrent time of electrical micro-machine, can judge accurately the overcurrent time, thereby startup or the resistance of accurate control micro electric machine turn; Antijamming capability is strong, and reliability is high.
The modular structure of the search lamp control device that the embodiment of the present invention provides as shown in Figure 2, for convenience of explanation, only shows the part relevant to the embodiment of the present invention, 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 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 the overcurrent time detecting is greater than the normal start-up time of electrical micro-machine 26, control micro electric 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 connecting lamp 24 of ballast 23, 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 outside remote signal receiving according to remote-control receiving circuit 25 or line control circuit 29 outputs, single-chip microcomputer 27 output control signals are to light source switch circuit 22, light source switch circuit 22 is controlled ballast 23, ballast 23 is controlled opening or closing of lamp 24.
In embodiments of the present invention, " overcurrent " is for the running current of electrical micro-machine 26, generally than running current more than large ten times; When electrical micro-machine 26 normal startup, electrical micro-machine 26 from static to normal rotation during this period of time in, the electric current when electric current of electrical micro-machine is greater than normal rotation, can define so: from electrical micro-machine, static what to electrical micro-machine, run well is " overcurrent time " during this period of time, and 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 as shown in Figure 3, because single chip circuit belongs to prior art, is not described in detail in this, and 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+is also connected with electrical micro-machine 26 by current-limiting resistance R4, the in-phase input end of comparator U5A+be also connected to by the feedback resistance R8 output of comparator; Inverting input-connection reference voltage generation unit 282 of comparator U5A; Power supply termination the 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 current-limiting resistance R9 and the filter capacitor C5 between second voltage (+5V) and ground; What the negative electrode of voltage is adjustable voltage-stabiliser tube U8 was connected to current-limiting resistance R9 and filter capacitor C5 is connected in series end S2, the reference utmost point of voltage is adjustable voltage-stabiliser tube U8 is by the divider resistance R7 and the divider resistance R5 ground connection that are connected in series successively, the plus earth of voltage is adjustable voltage-stabiliser tube U8; Divider resistance R7 and divider resistance R5 be connected in series end S3 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 TL431 chip.
In embodiments of the present invention, sample circuit 28 also comprises: be connected in series in successively the output of comparator U5A and the divider resistance R10 between ground and divider resistance R11, wherein, divider resistance R10 is connected with single-chip microcomputer 27 with the end S4 that is connected in series of divider resistance R11; The voltage of exporting due to comparator U5A is generally 12V; and the voltage of the I/O mouth of single-chip microcomputer 27 is generally lower than 5V; so the divider resistance R10 that employing is connected in series and divider resistance R11 are the required voltage of I/O mouth of single-chip microcomputer 27 by the voltage transitions of comparator U5A output, protection single-chip microcomputer 27 can not burnt.
Compared with prior art; the electrical micro-machine protective circuit that the embodiment of the present 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 " running well to electrical micro-machine 26; utilize the 27 calculating overcurrent times of single-chip microcomputer can judge more accurately the overcurrent time; solved the problem that electrochemical capacitor volume is unfavorable for greatly dwindling circuit board size; antijamming capability is strong simultaneously, and reliability is high.
The electrical micro-machine protective circuit providing in order to illustrate further the embodiment of the present invention, now describes its operation principle in detail in conjunction with Fig. 3 as follows:
Single-chip microcomputer 27 output electrical micro-machine working control signal, electrical micro-machine 26 starts, on sampling resistor R3, there is electric current to pass through, the sampled voltage at sampling resistor R3 two ends after current-limiting resistance R4 current limliting, input to the in-phase input end of comparator U5A+, and the inverting input of comparator U5A-a connect reference voltage, this reference voltage Shi You mono-tunnel+5V power supply is through current-limiting resistance R9 current limliting, then after the adjustable voltage-stabiliser tube U8 of overvoltage voltage stabilizing, then provide after divider resistance R7 and divider resistance R5 dividing potential drop.
Be T1 the start-up time that adopts 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 normal start-up time of reality 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 the overcurrent time T 2 detecting is less than threshold time T1, single-chip microcomputer 27 is judged as the starting current of electrical micro-machine 26, electrical micro-machine 26 normal operations; When the overcurrent time T 2 detecting is greater than threshold time T1; single-chip microcomputer 27 is judged as electrical micro-machine 26 overcurrents; outer mechanical resistance has occurred turns and (in the process that electrical micro-machine 26 rotates, by other objects, is blocked; turn motionless; be equivalent to external force and hinder its rotation), electrical micro-machine protective circuit will be sent excess current control signal, by single-chip microcomputer 27 control micro electric machines 26, is quit work; in the situation that outer mechanical resistance has occurred turning, electrical micro-machine 26 is protected.
In embodiments of the present invention, be connected to the inverting input of comparator U5A-the adjusting that can adapt according to the electrical micro-machine 26 of different model of the reference voltage that produces of reference voltage generation unit 282, 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 present invention to be provided is crossed the workflow of method of flow control, for convenience of explanation, only shows the part relevant to the embodiment of the present invention, and details are as follows.
Electrical micro-machine is crossed method of flow control and is comprised the following steps:
The input current of the first step, Real-time Collection electrical micro-machine, and described input current and predetermined current are compared, when described input current surpasses predetermined current, output sampled signal;
Second step, when single-chip microcomputer receives sampled signal, start timing;
The 3rd step, judge whether timing is less than default electrical micro-machine start-up time, if not, is judged to be electrical micro-machine overcurrent, by Single-chip Controlling electrical micro-machine, is quit work; If so, be judged to be electrical micro-machine and normally start, do not carry out protection action.The above-mentioned first step is realized by above-mentioned electrical micro-machine protective circuit in embodiments of the present invention.
The electrical micro-machine protective circuit that the embodiment of the present invention provides adopts single-chip microcomputer to detect the overcurrent time of electrical micro-machine, and when the overcurrent time detecting is greater than the normal start-up time of electrical micro-machine, control micro electric machine quits work, and protection electrical micro-machine is not damaged; Can judge accurately the overcurrent time, startup or the resistance of controlling accurately control micro electric machine turn, and antijamming capability is strong, and reliability is high; In addition owing to adopting adjustable reference voltage, and Single Chip Microcomputer (SCM) program repeat write, electrical micro-machine protective circuit is more suitable in the electrical micro-machine of various different models, improved the reliability of product, expanded the scope of application, be convenient to the modularization of circuit board.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (5)
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 the overcurrent time detecting is greater than the 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 successively the in-phase input end of described comparing unit and the current-limiting resistance R4 between ground and sampling resistor R3, be connected to the reference voltage generation unit of the inverting input of described comparing unit, and be connected to the in-phase input end of described comparing unit and the filter capacitor C13 between 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 is connected with described electrical micro-machine with the input of holding as described sample circuit that is connected in series of described sampling resistor R3;
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 is also connected with described electrical micro-machine by described current-limiting resistance R4, and the in-phase input end of described comparator is also 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;
Described reference voltage generation unit comprises:
Voltage is adjustable voltage-stabiliser tube, divider resistance R5, divider resistance R7 and be connected in series in second voltage and ground between current-limiting resistance R9 and filter capacitor C5;
The negative electrode 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 plus earth of the adjustable voltage-stabiliser tube of described voltage, the reference utmost point of the adjustable voltage-stabiliser tube of described voltage is by the described divider resistance R7 and the described divider resistance R5 ground connection that are connected in series successively;
The inverting input that is connected to described comparator is held in being connected in series of described divider resistance R7 and described divider resistance R5.
2. electrical micro-machine protective circuit as claimed in claim 1, is characterized in that, described voltage is adjustable, and voltage-stabiliser tube is TL431 chip.
3. electrical micro-machine protective circuit as claimed in claim 1, is characterized in that, described sample circuit also comprises:
Be connected in series in successively output and the resistance R between ground 10 and the resistance R 11 of described comparator,
Described resistance R 10 is connected with described single-chip microcomputer with the end that is connected in series of described resistance R 11.
4. a search lamp control device; it comprises: electrical micro-machine protective circuit; the light source switch circuit, remote-control receiving circuit, line control circuit and the electrical micro-machine that are connected with described electrical micro-machine protective circuit respectively; it is characterized in that, described electrical micro-machine protective circuit is the electrical micro-machine protective circuit described in claim 1-3 any one.
5. adopt the electrical micro-machine of the electrical micro-machine protective circuit described in claim 1-3 any one to cross a method of flow control, it is characterized in that, comprise the steps:
The input current of Real-time Collection electrical micro-machine, and described input current and predetermined current are compared, when described input current surpasses predetermined current, output sampled signal;
When single-chip microcomputer receives described sampled signal, start timing;
Judge whether timing is less than default electrical micro-machine start-up time, if not, is judged to be electrical micro-machine overcurrent, by Single-chip Controlling electrical micro-machine, is quit work.
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 CN101710693A (en) | 2010-05-19 |
| CN101710693B true CN101710693B (en) | 2014-03-12 |
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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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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN102510046B (en) * | 2011-11-03 | 2014-11-19 | 宁波沪江电机有限公司 | Over-current protector for motor |
| 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 |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101414747A (en) * | 2008-11-20 | 2009-04-22 | 宁波力达物流设备有限公司 | Overcurrent protective device for DC brush motor |
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2009
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101414747A (en) * | 2008-11-20 | 2009-04-22 | 宁波力达物流设备有限公司 | Overcurrent protective device for DC brush motor |
Non-Patent Citations (3)
| Title |
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| JP平3-135322A 1991.06.10 |
| 精密电压调节器TL431三种应用电路设计;贺桂芳;《山东科学》;20060228;第19卷(第1期);50-52 * |
| 贺桂芳.精密电压调节器TL431三种应用电路设计.《山东科学》.2006,第19卷(第1期),50-52. |
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