Invention content
In view of this, there is provided a kind of more with over-voltage over-current protection function for technical problems to be solved in this applicationChannel servo-driver can carry out overvoltage and overcurrent protection to power supply, improve the reliability of SERVO CONTROL driver.
In order to solve the above-mentioned technical problem, this application discloses a kind of multichannel servos with over-voltage over-current protection functionDriver, and realized using following technical scheme.
A kind of multichannel servo-driver with over-voltage over-current protection function, including microcontroller, n decoder, 2nPhase inverter, the roads 2n photoelectric isolating circuit, the roads 2n gate driving circuit, the roads 2n power module and power module；The n is more than 0Positive integer；The microcontroller, the decoder, the phase inverter, gate driving circuit described in the photoelectric isolating circuit andThe power module is sequentially connected electrically；The power module is powered for the servo-driver；The power module includes direct currentPower converting circuit, overvoltage crowbar and current foldback circuit, the overvoltage crowbar and the current foldback circuitIt is electrically connected respectively with the DC power supply translation circuit.
Further, the overvoltage crowbar includes busbar voltage detection circuit, stagnant ring comparison circuit and leadage circuit,And it is sequentially connected electrically；The busbar voltage detection circuit includes bleeder circuit and isolating amplifier circuit；The bleeder circuit and instituteIsolating amplifier circuit electrical connection is stated, the isolating amplifier circuit is electrically connected with the stagnant ring comparison circuit；The leadage circuit packetIsolated drive circuit and braking circuit are included, described isolated drive circuit one end is electrically connected with the stagnant ring comparison circuit, the other endIt is electrically connected with the braking circuit.
Further, the braking circuit includes mosfet pipes, fly-wheel diode and bleeder resistance, the mosfetThe poles G of pipe are electrically connected with the isolated drive circuit, and the fly-wheel diode is connected between the poles S and the poles D；The mosfet pipesThe poles S are electrically connected with the cathode of the DC power supply translation circuit, the poles D of the mosfet pipes concatenate after the bleeder resistance with instituteState the anode electrical connection of DC power supply translation circuit.
Further, the current foldback circuit includes being galvanically isolated Acquisition Circuit, comparison circuit, trigger circuit and PWMSignal lockout circuit, and be sequentially connected electrically；The comparison circuit includes two operational amplifiers and resistance net.
Further, the resistance net includes four resistance, and described four resistance are in parallel again after connecting two-by-two；Two groupsThe both ends of series circuit connect power supply and ground respectively, and described two groups of respective intermediate connection points of series circuit are respectively with described twoThe input terminal of a operational amplifier is electrically connected；The input terminal of the comparison circuit concatenate divide after a resistance two-way respectively with it is describedTwo operational amplifiers other input terminal electrical connection；The output ends of two operational amplifiers merge after with it is describedTrigger circuit is electrically connected.
Further, the decoder is 74ls139；The phase inverter is 74ls04.
Further, the microcontroller is XC167.
Compared with prior art, the application can be obtained including following technique effect：Increase overvoltage crowbar and mistakeStream protection circuit, improves the reliability of SERVO CONTROL driver.
Certainly, implementing any product of the application must be not necessarily required to reach all the above technique effect simultaneously.
Specific implementation mode
Presently filed embodiment is described in detail below in conjunction with accompanying drawings and embodiments, thereby how the application is appliedTechnological means solves technical problem and reaches the realization process of technical effect to fully understand and implement.
A kind of multichannel servo-driver with over-voltage over-current protection function, as shown in Figure 1, including microcontroller, decodingDevice, phase inverter, photoelectric isolation module, grid electrode drive module, power module, power module；Power module respectively with microcontroller andDecoder is electrically connected, and is the normal work power supply of microcontroller and decoder；Decoder is electrically connected with phase inverter；Phase inverter and photoelectricityIsolation module is electrically connected；Photoelectric isolation module is electrically connected with grid electrode drive module；Grid electrode drive module is electrically connected with power module.Microcontroller is communicated by RS232 buses with PC machine；Power module is electrically connected with motor, for controlling motor operating.
Wherein, microcontroller selects XC167；Decoder selects 74ls139；Phase inverter selects 74ls04.
Four-way servo controller driver, including microcontroller, decoder, phase inverter, four road photoelectric isolating circuits, fourRoad gate driving circuit, power module, power module.
Microcontroller is connect by universal serial bus RS-232 with host computer, is controlled for gathered data and to each module.The level of RS-232 signals and the level of microcontroller serial port signal are inconsistent, need to carry out level conversion between the two, this ShenMAX232 please be use to realize the mutual conversion between TTL logic levels and RS-232 level.Decoder uses 74ls139, usesLess input is realized compared with multi output, and the binary code that microcontroller is sent is translated into output information.
Phase inverter uses 74ls04, and the signal of prime output is carried out shaping, anti-interference process, improves driving capability, togetherShi Tisheng carrying load abilities reduce delay.The portion that four road photoelectric isolation modules are used to be disturbed interference source and easily from circuitDivide and keep apart, suppression system noise eliminates circuit interference, reduces distortion.Four road grid electrode drive modules are for driving switch electricitySource is connected and closes.Power module pushes load again for the signal that prime is sent to be further amplified, and then controls motor.
The application servo-driver utilizes control of the chip microcontroller to multiple motors, and impulse modulation is generated using microcontrollerSignal realizes the control to motor, it can be achieved that right by decoder, phase inverter, Phototube Coupling, gate driving and power moduleThe control of multiple loads.
Power module includes DC power supply translation circuit, overvoltage crowbar and current foldback circuit.DC power supply becomesChange the DC power signal that the power supply signal of input is converted into 15V and 27V by circuit.Overvoltage crowbar and current foldback circuitIt is electrically connected respectively with DC power supply translation circuit, for being carried out to DC power signal and servo-driver in overcurrent and overvoltageProtection, prevents from burning out component because of overcurrent and overvoltage.
Overvoltage crowbar includes busbar voltage detection circuit, stagnant ring comparison circuit and leadage circuit, wherein describedBusbar voltage detection circuit is for detecting busbar voltage comprising bleeder circuit and isolating amplifier circuit；The stagnant ring is more electricRoad is for busbar voltage to be compared with the voltage threshold of setting；The leadage circuit includes isolated drive circuit, mosfetPipe, fly-wheel diode and bleeder resistance.The poles G of mosfet pipes are electrically connected with isolated drive circuit, are connected between the poles S and the poles DFly-wheel diode；The poles S of mosfet pipes are electrically connected with the cathode of DC power supply translation circuit, and the poles the D concatenation of mosfet pipes is releasedIt is electrically connected with the anode of DC power supply translation circuit after resistance.When busbar voltage is higher than first voltage threshold value V1, pass through isolationDriving circuit opens mosfet pipes, and busbar voltage is consumed by bleeder resistance；When busbar voltage is less than second voltage thresholdWhen value V2, mosfet pipes are turned off by isolated drive circuit, stops busbar voltage and releases；Wherein, V1>V2>VDC, VDC are outsidePower power-supply input voltage.
Current foldback circuit includes being galvanically isolated Acquisition Circuit, comparison circuit, trigger circuit and pwm signal block electricityRoad, wherein be galvanically isolated Acquisition Circuit for detecting two-way phase current；Comparison circuit is used for the current threshold of phase current and settingValue is compared comprising two operational amplifiers and resistance net；Resistance net includes four resistance, after four resistance are connected two-by-twoParallel connection, the both ends of two groups of series circuits connect power supply and ground respectively, and the respective intermediate connection points of two groups of series circuits is respectively with twoThe input terminal of a operational amplifier is electrically connected.The input signal of comparison circuit divides two-way after concatenating a resistance, respectively with twoThe other input terminal electrical connection of operational amplifier.The output end of two operational amplifiers is electrically connected after merging with trigger circuit.When phase current I (IU or I V) is more than the first current threshold I1 or is less than the second current threshold I2, comparison circuit exports low levelSignal controls pwm signal lockout circuit by trigger circuit and blocks pwm signal；When phase current I (IU or I V) is less than the first electricityWhen flowing threshold value I1 and being more than the second current threshold I2, comparison circuit exports high level signal, passes through trigger circuit and controls PWM lettersNumber lockout circuit enables pwm signal.
The advantageous effect of the application is：Overvoltage crowbar and current foldback circuit are increased, SERVO CONTROL drive is improvedThe reliability of dynamic device.
A kind of multichannel servo-driver with over-voltage over-current protection function that the embodiment of the present application is provided above,It is described in detail.The description of the example is only used to help understand the method for the present application and its core ideas；MeanwhileFor those of ordinary skill in the art, according to the thought of the application, has change in specific embodiments and applicationsBecome place, in conclusion the contents of this specification should not be construed as limiting the present application.
Some vocabulary has such as been used to censure specific components in specification and claim.Those skilled in the art answerIt is understood that hardware manufacturer may call the same component with different nouns.This specification and claims are not with nameThe difference of title is used as the mode for distinguishing component, but is used as the criterion of differentiation with the difference of component functionally.Such as logicalThe "comprising" " comprising " of piece specification and claim mentioned in is an open language, therefore should be construed to " comprising/includeBut it is not limited to "." substantially " refer in receivable error range, those skilled in the art can be within a certain error rangeThe technical problem is solved, the technique effect is basically reached.Specification subsequent descriptions are to implement the preferable embodiment party of the applicationFormula, so the description is being not limited to scope of the present application for the purpose of the rule for illustrating the application.The application'sProtection domain is when subject to appended claims institute defender.
It should also be noted that, the terms "include", "comprise" or its any other variant are intended to nonexcludabilityIncluding so that commodity or system including a series of elements include not only those elements, but also include not clearThe other element listed, or further include for this commodity or the intrinsic element of system.In the feelings not limited moreUnder condition, the element that is limited by sentence "including a ...", it is not excluded that including the element commodity or system in alsoThere are other identical elements.
Several preferred embodiments of the application have shown and described in above description, but as previously described, it should be understood that the applicationBe not limited to form disclosed herein, be not to be taken as excluding other embodiments, and can be used for various other combinations,Modification and environment, and the above teachings or related fields of technology or knowledge can be passed through in application contemplated scope described hereinIt is modified.And changes and modifications made by those skilled in the art do not depart from spirit and scope, then it all should be in this ShenIt please be in the protection domain of appended claims.