CN103001186A - Motor-driven controller with current-limiting protection - Google Patents
Motor-driven controller with current-limiting protection Download PDFInfo
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- CN103001186A CN103001186A CN2012104735046A CN201210473504A CN103001186A CN 103001186 A CN103001186 A CN 103001186A CN 2012104735046 A CN2012104735046 A CN 2012104735046A CN 201210473504 A CN201210473504 A CN 201210473504A CN 103001186 A CN103001186 A CN 103001186A
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Abstract
The invention discloses a motor-driven controller with current-limiting protection. The motor-driven controller with current-limiting protection is characterized by comprising a sampling unit, a setting unit, an operation processing unit and a comparing unit, wherein the sampling unit is used for collecting the current of a sampling circuit system and conveying collected current signals to the operation processing unit; the setting unit is used for setting the limit value of the current and conveying the current to the operation processing unit; the operation processing unit is used for receiving the current signals collected by the sampling unit and limit value signals set by the setting unit and performing the processing so that the current signals and the limit value signals become required data formats to output to the comparing unit; and the comparing unit is used for receiving the collected current signals conveyed by the operation processing unit and the current limit value signals of the setting unit and comparing the current signals with the current limit value signals, wherein a shutdown signal is output if the current value collected by the sampling unit is larger than the current value set by the setting unit, and the shutdown signal is used for shutting down a sampling circuit system; and the shutdown signal is not output if the current value collected by the sampling unit is smaller than the current value set by the setting unit.
Description
Technical field
The present invention relates to have the motor drive controller of current-limiting protection.
Background technology
Promoting the use of in the process of the magneto of making in current research and development, when the drive operation of magneto is in some non-normal working conditions, more and more higher to the specification requirement of implementing corresponding safeguard measure.Current limit is intended to not change under the prerequisite of normal operation circuit characteristic, realizes the current limit that needs surpassing.The key property that desirable demand limiter should have: consumed power not when normally moving, only when the needs Limited Current, work, and after fault condition was removed, system can also resume work; The circuit system structure of Limited Current is simple, reliable simultaneously, repeatedly continuous action; Cost is low.And the current limiting technique of at present practical application mainly contains digital control current limiting technique and simulation current limiting technique.
The principle of digital control current limiting technique: when having served as multi-load and being added on the inverter; under the inverter fed control action; if not making current limliting and short-circuit protection processes; then output voltage can keep constant; but output current increases; when electric current acquires a certain degree, switching tube will burn, and makes the inverter load cause excessive electric current.If reduce the amplitude of inverter output voltage, just might limit the power that is delivered to load, in order to implement the method, need to detect inductive current, after detecting electric current, need to carry out sinusoidal calculations, calculate the range value in this moment, then with preassigned given range in value compare, as in given range, then do not do any processing; When electric current exceeds normal range (NR).Find corresponding multiplication factor by the factor table of searching previous formulation, to reduce the amplitude of output voltage.The electric current that detects is larger, and multiplication factor is less, like this, has just reduced output voltage, has limited output current.
The part yet digital control current limiting technique comes with some shortcomings:
1. need to carry out sinusoidal calculations, high to the requirement of microprocessor, need to calculate in real time.So just need to introduce microprocessor, not only increased the cost of system, but also need to test accordingly, the construction cycle of system also can increase.
2. the factor table of electric current needs to obtain by experiment in test, and experiment number and cycle are long.In order to obtain more accurately factor table, need under different environment, test, making up test condition also is a problem.Simultaneously the data of test also needed to carry out the processing of some algorithms, so inevitable meeting and the actual deviation that occurs affect the overall performance of system.
With real system in conjunction with problem, for the different demands in the reality, if all by processing like this, will be complicated some simple questions, be unfavorable for using, also increased cost.
Summary of the invention
One of purpose of the present invention is in order to overcome deficiency of the prior art, a kind of motor drive controller with current-limiting protection easy to use to be provided.
For realizing above purpose, the present invention is achieved through the following technical solutions:
Have the motor drive controller of current-limiting protection, it is characterized in that, comprising:
Sampling unit be used for to gather the electric current of sample circuit system, and the current signal that gathers is delivered to operation processing unit;
Setup unit be used for to be set the limits value of electric current, and it is delivered to operation processing unit;
Operation processing unit, the limits value signal that be used for to receive adopts current signal that the unit gathers and setup unit to set, and process and make it to become the data format that needs and export comparing unit to;
Comparing unit be used for to receive the current signal of the collection that operation processing unit carries and the current limit value signal of setup unit, and both are compared; If output shutdown signal during the current value that the current value that sampling unit gathers is set greater than setup unit, described shutdown signal is used for closing the sample circuit system; If during the current value that the current value of sampling unit collection is set less than setup unit then do not export shutdown signal.
Preferably, also comprise filter unit, described filter unit is used for receiving the current signal that adopts the unit conveying and eliminates the burr pulse, for operation processing unit provides suitable collection current value.
Preferably, described filter unit is the RC circuit.
Preferably, described setup unit adjustable current limits value.
Preferably, described setup unit comprises potentiometer, adjusts the limits value of electric current by described potentiometer.
Preferably, described sampling unit comprises constantan wire, and described constantan wire is in parallel more than two.
The motor drive controller with current-limiting protection among the present invention can reduce the complexity of practical operation, reduces cost, and the Redundancy Design that solves in the engineering construction requires problem.In the course of work of the present invention, each pointwise and set point relatively can be recovered in the situation that does not affect system works automatically, carry out multi-pass operation, and cost performance are higher.
Description of drawings
Fig. 1 is general construction of the present invention and external relation block diagram.
Fig. 2 is the current curve diagram of the actual current limliting in the course of work of the present invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in detail:
As shown in Figure 1, have the motor drive controller of current-limiting protection, comprising:
Sampling unit be used for to gather the electric current of sample circuit system, and the current signal that gathers is delivered to filter unit.Sampling unit adopts the constantan wire more than two in parallel.
Filter unit, described filter unit are used for receiving the current signal that adopts the unit conveying and eliminate the burr pulse, for operation processing unit provides suitable collection current value.Filter unit is the RC circuit.
Setup unit be used for to be set the limits value of electric current, and it is delivered to operation processing unit.Setup unit includes potentiometer, the size of the limits value of potentiometer adjustable current.
Operation processing unit, the limits value signal that be used for to receive adopts current signal that the unit gathers and setup unit to set, and process and make it to become the data format that needs and export comparing unit to;
Comparing unit be used for to receive the current signal of the collection that operation processing unit carries and the current limit value signal of setup unit, and both are compared; If output shutdown signal during the current value that the current value that sampling unit gathers is set greater than setup unit, described shutdown signal is used for closing the sample circuit system; If during the current value that the current value of sampling unit collection is set less than setup unit then do not export shutdown signal.
In the course of work of the present invention, each pointwise and set point compare, and actual comparison curves can recover in the situation that does not affect system works as shown in Figure 2 so automatically, carry out multi-pass operation, and cost performance is higher.
The use hardware circuit is finished the signal that samples and given signal is compared processing, export corresponding actuating signal, this process is that pointwise is carried out, namely constantly compare, system slowly maintained in the current value range of setting, for the current value that surpasses also can the automatic detection and adjustment system action, after over-current state disappears, need not artificially participate in just automatically recovery operation, and can automatically repeatedly move, simple and reliable.The present invention is that the pointwise current limliting drives the hardware circuit of resist technology realization and the unit of other circuit interface, and this unit can be introduced circuit easily, and the power of consumption is little, can not produce other components of system as directed and disturb.
Embodiment among the present invention only is used for that the present invention will be described, does not consist of the restriction to the claim scope, and other substituting of being equal in fact that those skilled in that art can expect are all in protection range of the present invention.
Claims (6)
1. have the motor drive controller of current-limiting protection, it is characterized in that, comprising:
Sampling unit be used for to gather the electric current of sample circuit system, and the current signal that gathers is delivered to operation processing unit;
Setup unit be used for to be set the limits value of electric current, and it is delivered to operation processing unit;
Operation processing unit, the limits value signal that be used for to receive adopts current signal that the unit gathers and setup unit to set, and process and make it to become the data format that needs and export comparing unit to;
Comparing unit be used for to receive the current signal of the collection that operation processing unit carries and the current limit value signal of setup unit, and both are compared; If output shutdown signal during the current value that the current value that sampling unit gathers is set greater than setup unit, described shutdown signal is used for closing the sample circuit system; If during the current value that the current value of sampling unit collection is set less than setup unit then do not export shutdown signal.
2. the motor drive controller with current-limiting protection according to claim 1; it is characterized in that; also comprise filter unit, described filter unit is used for receiving the current signal that adopts the unit conveying and eliminates the burr pulse, for operation processing unit provides suitable collection current value.
3. the motor drive controller with current-limiting protection according to claim 2 is characterized in that, described filter unit is the RC circuit.
4. the motor drive controller with current-limiting protection according to claim 1 is characterized in that, described setup unit adjustable current limits value.
5. the motor drive controller with current-limiting protection according to claim 4 is characterized in that, described setup unit comprises potentiometer, adjusts the limits value of electric current by described potentiometer.
6. the motor drive controller with current-limiting protection according to claim 1 is characterized in that, described sampling unit comprises constantan wire, and described constantan wire is in parallel more than two.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104735046A CN103001186A (en) | 2012-11-20 | 2012-11-20 | Motor-driven controller with current-limiting protection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104735046A CN103001186A (en) | 2012-11-20 | 2012-11-20 | Motor-driven controller with current-limiting protection |
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| CN103001186A true CN103001186A (en) | 2013-03-27 |
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| CN2012104735046A Pending CN103001186A (en) | 2012-11-20 | 2012-11-20 | Motor-driven controller with current-limiting protection |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2409695Y (en) * | 1998-11-05 | 2000-12-06 | 乐清市福特热继电器厂 | Intelligent protector for electric machine |
| CN2531564Y (en) * | 2002-02-10 | 2003-01-15 | 韩君杰 | Digital electronic motor protector |
| CN102290790A (en) * | 2011-08-25 | 2011-12-21 | 南京航空航天大学 | Fault detecting and protective circuit of brushless direct current motor |
| CN202997521U (en) * | 2012-11-20 | 2013-06-12 | 上海硅力电子科技有限公司 | Motor drive controller having current-limiting protection function |
-
2012
- 2012-11-20 CN CN2012104735046A patent/CN103001186A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2409695Y (en) * | 1998-11-05 | 2000-12-06 | 乐清市福特热继电器厂 | Intelligent protector for electric machine |
| CN2531564Y (en) * | 2002-02-10 | 2003-01-15 | 韩君杰 | Digital electronic motor protector |
| CN102290790A (en) * | 2011-08-25 | 2011-12-21 | 南京航空航天大学 | Fault detecting and protective circuit of brushless direct current motor |
| CN202997521U (en) * | 2012-11-20 | 2013-06-12 | 上海硅力电子科技有限公司 | Motor drive controller having current-limiting protection function |
Non-Patent Citations (1)
| Title |
|---|
| 聂兆祥: "高压电机过流保护的改进方案", 《齐鲁石油化工》 * |
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Application publication date: 20130327 |
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