CN201576191U

CN201576191U - Electric MLC (multi leaf collimator) control circuit

Info

Publication number: CN201576191U
Application number: CN200920214860XU
Authority: CN
Inventors: 王满仓; 王国岭; 董明; 梁石磊
Original assignee: SHANGHAI EASTIMAGE EQUIPMENTS CO Ltd
Current assignee: SHANGHAI EASTIMAGE EQUIPMENTS CO Ltd
Priority date: 2009-12-24
Filing date: 2009-12-24
Publication date: 2010-09-08
Anticipated expiration: 2019-12-24

Abstract

The utility model relates to an electric MLC (multi leaf collimator) control circuit, in particular to a circuit for accurately controlling an MLC. The control circuit comprises a master control circuit module, secondary control circuit modules and a motor driving module. A serial port of the master control circuit module is connected with a PC terminal, and another serial port is connected with a serial port of the secondary control circuit module; the motor driving module converts a control signal from the control circuit module and drives the motor so as to adjust the location or/and speed of the MLC; the control circuit is provided with two or more than two secondary control circuit modules; the secondary control circuit modules are respectively connected with serial ports output bus of the master control circuit module; each secondary control circuit module is connected with the motor driving module in a driving way so as to control the location or/and speed of the motor. The electric MLC control circuit has characteristics of novel structure, rapid control response, accurate control of MLC location and speed and the like.

Description

A kind of electric multiblade optical grating control circuit

Technical field:

The utility model relates to a kind of grating control circuit, more particularly is a kind of circuit that multi-leaf optical grating is accurately controlled of being used for.

Background technology

At present, grating is more extensive in applications such as printing, stereo images.When adopting the multi-leaf optical grating structure, often need every leaf grating is accurately controlled to obtain various Expected Results.Along with increasing of grating quantity, must need to increase motor that stop position and speed are regulated and each motor is carried out driving control unit.And along with the increase of control module, if all control modules are all direct and computer carries out direct communication, increase heavy load then will inevitably for PC (computing machine), have a strong impact on the efficient of control and the accurate location of grating, even cause the machine of delaying of PC terminal, so the position of a plurality of gratings is located fast, accurately controlled with realization by the improvement of control device structure and the innovation of circuit, the problems such as synchronous and coordination that solve between a plurality of control modules are the problems that multi-leaf optical grating control need face and solve.

The utility model content

The disclosed purpose of the utility model is to disclose a kind of control circuit that can realize multi-leaf optical grating is carried out accurate reliable control, by this utility model, can effectively solve multi-leaf optical grating position fast detecting, the synchro control between the grating, control the problems such as quick communication of each module and PC.

The utility model is achieved through the following technical solutions:

A kind of electric multiblade optical grating control circuit, this circuit comprises the main control circuit module, from control circuit module, motor drive module, main control circuit module one serial ports is connected with the PC terminal, another serial ports is connected with serial ports from control circuit module, the motor drive module module converts come since the control signal of control circuit module and drive motor with the position of regulating grating or/with speed, it is characterized in that: described control circuit has two or more from control circuit module; From being connected with the serial ports output bus of main control circuit module respectively of control circuit module; Each from control circuit module drive respectively the position that connects a motor drive module and then control motor or/with speed.

Further, described circuit module with adopt ATmega162 control chip and DSPIC30F2010 controller as main control chip respectively from control circuit module, the serial ports pin of each DSPIC30F2010 is connected with ATmega 162 control chips one serial ports by the MAX3468 element, and another serial ports of ATmega 162 control chips is connected with the PC terminal by the MAX3468 element.

As optimization, the main control circuit module of the above, adopt the communication of RS485 communication modes from control circuit module, described multi-leaf optical grating control circuit and the communication of PC terminal employing RS485 communication modes.

Further optimize, described main control circuit module is connected from control circuit module with 56.

The electronic control system of multi-leaf optical grating in sum, its control device adopts a main control circuit module to carry out the circuit structure of communication and control and adopt the RS485 mode to realize that the communication between them not only can improve the reliability to communication between the control device of PC from control circuit module a plurality of, reduce the load of PC end, the position and the speed that more can obtain to improve servomotor and grating are simultaneously controlled beneficial effects such as real-time and accuracy.

Description of drawings:

Fig. 1 is a circuit module connection diagram of the present utility model;

Embodiment

Below in conjunction with accompanying drawing, preferred implementation of the present utility model is described further:

With reference to shown in Figure 1, a kind of electric multiblade optical grating control circuit structure is disclosed, wherein an end data interface of this circuit is connected and adopts the communication of carrying out of RS485 agreement with PC, and other end output drive control signal is subjected to position, the speed of the grating of drive of motor to each servomotor and then control.Wherein, PC is a terminal device of realizing human-computer interaction interface and short range/Long-distance Control, when being the application of grating control circuit, and control strategy and instruction entry terminal; Servomotor is the gear train that is subjected to the directly actuated object of grating control circuit and the position of grating, speed are adjusted.

And for example shown in Figure 1, the multi-leaf optical grating control circuit has a main control circuit module, two or more from control circuit module.Each is connected with main control circuit module controls serial ports output pin respectively to realize utilizing the communication between realization of main control circuit module and the PC from control circuit module.In the present embodiment, main control circuit module and adopt ATmega162 chip, DSPIC30F2010 chip as its main control chip respectively from control circuit module.During work, main control unit receives from replying confirmation after the order of PC, on the one hand the order of receiving is discerned, the command frame that needs are transmitted adds each and sends in order from the control unit behind the address of control unit, on the other hand by itself regularly query strategy each status information from the control unit is monitored.Between PC and the control device, main control circuit module and from adopting the RS485 agreement to carry out communication between the control circuit module respectively, it is advantageous that, the interface signal level is low, do not allow the chip of rapid wear interface circuit, the data maximum transmission rate is 10Mbps, help improving the speed of response each other, noise immunity, communication distance distance etc.In order to satisfy main control circuit module 21 and the condition of work of control chip from control circuit module 22,18 and 19 pins of ATmega162 chip connect one and have 11.0592 crystal oscillator with the needed frequency of the work of obtaining, 6 pins of DSPIC 30F2010 chip adopt the clock frequency of 7.372MH as its clock frequency input, and other condition of power supply can be implemented with reference to the operation instruction of this chip.

Be connected with main control circuit module serial ports output bus respectively from control circuit module with reference to 1,56 in figure.During concrete enforcement, can decide according to grating quantity and actual needs from the actual quantity of control circuit module.Because main control circuit module and the communications protocol that adopts RS485 from control circuit module can make from control can reach 400 from control circuit module quantity maximum by changing the type of 485 chips.All are basic identical from the circuit of control circuit module, because each has distributed address unique the system from the control unit, from the order of control circuit module reception from the main control circuit module, respectively real time reaction is made in position, the state of inquiring about motor and the order that requires motor movement etc., can realize the access support of a large amount of control circuit module on the one hand, simultaneously save the cost of main control circuit module again, guarantee communication efficiency each other.

With reference to figure 1, the multi-leaf optical grating control circuit also has motor drive module, and motor drive module is realized being converted into the simulation control output that is fit to servomotor from the digital control output of control circuit module between control circuit module and the servomotor.It is main chip for driving that motor drive module adopts A3953SLB, from the microcontroller chip of control circuit module connect main chip for driving A3953SLB /BREAK, PHASE ,/three pins of ENABLE, to realize comprising the function of brake control, direction control, PWM control.The coding that the scrambler of servomotor inside returns is counted by the QEI interface; realize position feedback, and with analog feedback signal input to from the ADC analog-to-digital conversion module of the microcontroller chip of control circuit module with the monitoring that realizes stop position with the driven by servomotor overcurrent is protected.

Those skilled in the art will recognize that; above-mentioned embodiment is exemplary; be in order to make those skilled in the art can better understand this patent content; should not be construed as is restriction to this patent protection domain; change or modify so long as disclose spiritual any being equal to of being done, all fall into this patent protection domain according to this patent.

Claims

1. electric multiblade optical grating control circuit, this circuit comprises the main control circuit module, from control circuit module, motor drive module, main control circuit module one serial ports is connected with the PC terminal, another serial ports is connected with serial ports from control circuit module, the motor drive module module converts come since the control signal of control circuit module and drive motor with the position of regulating grating or/with speed, it is characterized in that: described control circuit has two or more from control circuit module; From being connected with the serial ports output bus of main control circuit module respectively of control circuit module; Each from control circuit module drive respectively the position that connects a motor drive module and then control motor or/with speed.

2. electric multiblade optical grating control circuit according to claim 1, it is characterized in that: described circuit module with adopt ATmega162 control chip and DSPIC30F2010 controller as main control chip respectively from control circuit module, the serial ports pin of each DSPIC30F2010 is connected with ATmega162 control chip one serial ports by the MAX3468 element, and another serial ports of ATmega162 control chip is connected with the PC terminal by the MAX3468 element.

3. according to claim 1 or the described electric multiblade optical grating control circuit of 2 arbitrary claims, it is characterized in that: described main control circuit module, adopt the communication of RS485 communication modes from control circuit module, described multi-leaf optical grating control circuit and the communication of PC terminal employing RS485 communication modes.