CN111740646A - Beam limiter control circuit for controlling opening and closing of lead plate through direct current motor - Google Patents

Abstract

The invention belongs to the technical field of beam limiter control circuits, and particularly relates to a beam limiter control circuit for controlling a lead plate to be opened and closed through a direct current motor, wherein six direct current motor circuits are directly controlled through a DSP (digital signal processor) main control circuit with six or more PWM (pulse width modulation) controls, six direct current motors are respectively controlled through the six direct current motor circuits, and the six direct current motors respectively control the running directions of 2 height lead plates, 2 width lead plates and 2 filter wire device copper sheets. The invention solves the problems that the structure design adopted by the control part of the beam limiter system is complex and the precision is not high because the lead plate is driven to move only by the stepping motor, and simultaneously creatively designs the constant-speed running speed mode of the lead plate controlled by the traditional encoder into the mode of identifying different adjusting speeds to change the running speed, thereby greatly improving the accuracy while improving the operation reliability and being convenient to adjust and set.

Description

Beam limiter control circuit for controlling opening and closing of lead plate through direct current motor

Technical Field

The invention belongs to the technical field of beam limiter control circuits, and particularly relates to a beam limiter control circuit for controlling a lead plate to be opened and closed through a direct current motor.

Background

At present, the design of the wire harness device is still kept in the design concept 15-20 years ago no matter at home or abroad, and the architecture concept of MCU + FPGA + stepping motor is adopted. The FPGA control chip is responsible for processing the contents of a key, a knob, a display and other human-computer interaction parts, and the MCU is used for processing the functions of starting and stopping a timer, moving a stepping motor, communicating with the FPGA, controlling the communication of a host through a CAN bus and the like.

The outstanding problem of the above design framework is that the action back reflection time of the button and knob generated during human-computer interaction is too long, so that the machine reflection speed is slow, the opening and closing time and the opening and closing size control period of the lead plate and the wire filter are longer, some lead plates and wire filters even need more than 0.5s to reach the ideal state of pre-design, and the radiation field error is mostly about 1.2% times of SID. When excessive parts of a human body are exposed in the X-ray irradiation range, most parts of the parts are not required to be irradiated by X-rays originally or some parts of the parts are exposed in the X-ray irradiation range in a short time originally, so that unnecessary irradiation dose is increased, and unnecessary potential safety hazards brought by a patient in medical diagnosis are increased.

Disclosure of Invention

In order to solve the technical problems, the invention provides a beam limiter control circuit for controlling a lead plate to open and close through a direct current motor, and aims to solve the problems that the structure design structure adopted by the control part of the conventional beam limiter system is complex, and the precision is not high due to the fact that the lead plate is driven to move only by a stepping motor, and meanwhile, the constant-speed running speed mode of the lead plate controlled by a traditional encoder is creatively designed to recognize different adjusting speeds to change the running speed, so that the precision is greatly improved while the operation reliability is improved, and the adjustment and the setting are convenient.

The invention is realized in such a way that a beam limiter control circuit for controlling the opening and closing of lead plates through a direct current motor directly controls six direct current motor circuits through a DSP (digital signal processor) main control circuit with six or more PWM (pulse width modulation) controls, six direct current motors are respectively controlled through the six direct current motor circuits, and the six direct current motors respectively control the running directions of 2 height lead plates, 2 width lead plates and 2 wire filter copper sheets.

Preferably, the device also comprises a power supply circuit, a JTAG circuit, an RAM storage circuit, an X-ray simulating LED lamp circuit, an LED lamp cooling fan circuit, a laser tube circuit, an RS485 communication circuit, an RS232 communication circuit, a CAN communication circuit, an EEPROM circuit, a dial switch and indicator lamp circuit, a line filter identification circuit, a height lead plate position sensor identification circuit, a width lead plate position sensor identification circuit, a safety position switch circuit and an interface connector connection circuit which are respectively connected with a DSP main control circuit with six or more PWM controls, wherein the interface connector connection circuit is respectively connected with a rotary encoder circuit, an external key circuit and an LCD display screen interface circuit, the DSP main control circuit with six or more PWM controls adopts a TMS320F28335 control chip, and the TMS320F28335 control connection relation that the marks of each pin of the chip are consistent with the marks of each pin of other circuits is represented correspondingly.

Preferably, the power supply circuit is configured to rectify, filter and step down a voltage provided by an external interface and then supply power to different circuits, the power supply circuit includes a Z1 rectifier bridge circuit, a U1 voltage-dropping circuit and a U2 voltage-dropping circuit, which are connected in sequence, and a U3 voltage-dropping circuit is further connected between the U1 voltage-dropping circuit and the U2 voltage-dropping circuit, the Z1 rectifier bridge circuit rectifies and filters a DC24V or AC24V power voltage provided by the external interface, the U1 voltage-dropping circuit outputs a DC5V voltage externally and supplies power to the U2 voltage-dropping circuit and the U3 voltage-dropping circuit, the U2 voltage-dropping circuit outputs a DC3.3V voltage externally, the U3 voltage-dropping circuit outputs DC3.3V and DC1.9V voltages externally, and the DC1.9V voltage supplies power to the TMS320F28335 control chip;

the U1 voltage-reducing circuit adopts an LM2596-5.0 chip, the U2 voltage-reducing circuit adopts a TPS76833Q chip, the U3 voltage-reducing circuit adopts a TPS75701KTT chip, pin 1 and pin 4 of the Z1 rectifier bridge circuit output +24V voltage, pin 1 of the U1 voltage-reducing circuit is connected, pin 2 and pin 4 of the U1 voltage-reducing circuit output +5V voltage, pin 3 and pin 4 of the U2 voltage-reducing circuit are connected, pin 5 and pin 6 of the U2 voltage-reducing circuit output +3.3V voltage, pin 2 and pin 4 of the U1 voltage-reducing circuit are also connected with pin 5 and pin 6 of the U3 voltage-reducing circuit, pin 23 and pin 24 of the U3 voltage-reducing circuit output 1.9V voltage, pin 4, pin 15, pin 23, pin 29, pin 61, pin 101, pin 109, pin 117, pin 126, pin 139, pin 146, pin 154 and pin 167 of the TMS320F28335 control chip, and pin 2 and pin 6853 of the Z1 rectifier bridge circuit detect through pin 290 of the TLP chip, when the voltage at pin 3 of TLP290SE suddenly changes from high to low at a certain time, which indicates that the external power supply has stopped, the TMS320F28335 controls the chip to save the current data backup by using the externally released power stored in the capacitor CH1, the capacitor CH2 and the capacitor C1.

Preferably, the six direct current motor circuits comprise a clockwise running circuit of a height lead plate motor, a counterclockwise running circuit of the height lead plate motor, a clockwise running circuit of a width lead plate motor, a counterclockwise running circuit of the width lead plate motor, a clockwise running circuit of a copper sheet motor of a filter and a counterclockwise running circuit of the copper sheet motor of the filter;

six direct current motor circuits are respectively supported by +24V voltage, a high lead plate motor clockwise operation circuit is connected with pin 5 of a TMS320F28335 control chip, a high lead plate motor anticlockwise operation circuit is connected with pin 6 of the TMS320F28335 control chip, a width lead plate motor clockwise operation circuit is connected with pin 7 of the TMS320F28335 control chip, a width lead plate motor anticlockwise operation circuit is connected with pin 10 of the TMS320F28335 control chip, a filter copper sheet motor clockwise operation circuit is connected with pin 75 of the TMS320F28335 control chip, and the filter copper sheet motor anticlockwise operation circuit is connected with pin 88 of the TMS320F28335 control chip.

The height lead plate motor clockwise operation circuit, the height lead plate motor anticlockwise operation circuit respectively control install height lead plate clockwise operation motor M1 and height lead plate anticlockwise operation motor M2 at both ends about same track, the width lead plate motor clockwise operation circuit, the width lead plate motor anticlockwise operation circuit respectively control install width lead plate clockwise operation motor M3 and width lead plate anticlockwise operation motor M4 at both ends about same track, filter copper sheet motor clockwise operation circuit and filter copper sheet motor anticlockwise operation circuit respectively control install filter copper sheet clockwise operation motor M5 and filter copper sheet anticlockwise operation motor M6 at both ends about same track.

Further preferably, the RAM storage circuit is used for storing data and backup programs in the operation process of the device; the RS485 communication circuit, the RS232 communication circuit and the CAN communication circuit are all used for communication and data transmission and man-machine interaction control equipment, and the EEPROM circuit is used for setting default parameters before delivery, correcting data again when errors occur and backing up data when power is off;

the RAM storage circuit IS supported by +3.3V voltage, an IS61LV51216-10TI chip U5 IS adopted, and the connection relation with the TMS320F28335 control chip IS 19 address lines and 16 data lines; and the RS485 communication circuit, the RS232 communication circuit, the CAN communication circuit and the EEPROM circuit are respectively supported by +3.3V voltage.

Preferably, the X-ray simulated LED lamp circuit is used for controlling on and off of an LED lamp simulating an X-ray radiation field, the LED lamp radiator fan circuit is used for starting and stopping a radiator fan to radiate heat to the LED lamp, and the laser tube circuit is used for starting and stopping a laser tube to emit laser;

the LED lamp circuit for simulating the X-ray is supported by +24V voltage, an LM3409 chip is adopted, and the LED lamp circuit is connected with a pin 13 of the TMS320F28335 control chip through a pin 3; the LED lamp cooling fan circuit is supported by +24V voltage, a Melx533750410 chip is connected with a pin 11 of a TMS320F28335 control chip, and the laser tube circuit is supported by +5V voltage, a Melx533750410 chip is also connected with a pin 12 of the TMS320F28335 control chip.

Preferably, the dial switches and the indicating lamp circuit are used for controlling the switch states and the operation modes of the dial switches on the beam limiter and the flashing period of the indicating lamp, the wire filter identification circuit is used for identifying whether a copper sheet of the wire filter shields a sensor at a corresponding position, the height lead plate position sensor identification circuit is used for identifying whether a height lead plate runs to a maximum stroke position, the width lead plate position sensor identification circuit is used for identifying whether a width lead plate runs to the maximum stroke position, and the safety position switch circuit is used for identifying whether the height lead plate and the width lead plate exceed the maximum stroke position;

the dial switch and the indicating lamp circuit are supported by +3.3V voltage, and are connected with a pin 89, a pin 90, a pin 91, a pin 94, a pin 73 and a pin 74 of the TMS320F28335 control chip by adopting an SMD-SW-1.27 chip; the identification circuit of the wire filter is supported by +5V voltage, and 2 Melx533750510 chips are adopted to be connected with a pin 95, a pin 96, a pin 97, a pin 98, a pin 99 and a pin 100 of a TMS320F28335 control chip; the height lead plate position sensor identification circuit and the width lead plate position sensor identification circuit are supported by +5V voltage, and are connected with a pin 21 and a pin 24 of a TMS320F28335 control chip by adopting a Melx533750510 chip; the safe position switch circuit is supported by +5V voltage, and two Melx533750510 chips are adopted to be connected with a pin 27, a pin 28, a pin 62 and a pin 63 of a TMS320F28335 control chip.

Preferably, the interface connector connecting circuit is used for connecting the DSP main control circuit with six or more PWM controls with the rotary encoder circuit, the external key circuit, and the LCD display screen interface circuit, the rotary encoder circuit is used for adjusting and controlling the rotation speed of the 2-height lead plate operation motors and the rotation speed of the 2-width lead plate operation motors, the external key circuit is used for controlling the number of X-rays blocked by the filter copper sheets, controlling whether to turn on the LED lamps, the cooling fans, and the laser tubes that simulate the X-rays, controlling and storing the current lead plate position and the number of the filter copper sheets, and controlling the distance of SID, and the LCD display screen interface circuit is used for accessing the LCD display screen;

interface connector piece connecting circuit passes through +5V voltage support, adopts T812130A100CEU or AEHW30G0502-T-R chip, one side with the corresponding pin of TMS320F28335 control chip is connected, and rotary encoder circuit, outside key circuit and LCD display screen interface circuit are connected through the corresponding pin to the opposite side, and rotary encoder circuit, outside key circuit and LCD display screen interface circuit all support through +5V voltage.

Compared with the prior art, the invention has the advantages that:

the method has the advantages that a complex double-chip interactive communication mode is not adopted any more, a high-precision DSP chip with PWM control is directly adopted, a stepping motor is not adopted any more, a left direct current motor and a right direct current motor replace the stepping motor, a lead plate can be controlled to reach a target position more quickly, the time for reaching the specified stroke and running is greatly shortened, the running stability is improved, the phenomenon of X-ray shaking caused by starting and stopping the stepping motor is avoided, and the injury to a human body is reduced.

Drawings

FIG. 1 is a block diagram of an overall control circuit of the present invention;

FIG. 2 is a circuit diagram of a DSP control chip of TMS320F 28335;

FIG. 3-1 is a circuit diagram of clockwise operation of the high lead plate motor;

FIG. 3-2 is a circuit diagram of counterclockwise operation of the height cliche motor;

fig. 3-3 are circuit diagrams of clockwise operation of a width lead plate motor;

FIGS. 3-4 are circuit diagrams illustrating counterclockwise operation of a width lead plate motor;

fig. 3-5 are circuit diagrams of clockwise operation of the copper sheet motor of the wire filter;

3-6 are circuit diagrams of counterclockwise operation of the copper sheet motor of the wire filter;

FIG. 4 is a power supply circuit diagram;

FIG. 5 is a circuit diagram of a RAM memory;

FIG. 6-1 is a circuit diagram of an LED lamp simulating X-rays;

FIG. 6-2 is a circuit diagram of a heat dissipation fan of an LED lamp;

6-3 are laser tube circuit diagrams;

FIG. 7 is a circuit diagram of RS485 communication;

FIG. 8 is a circuit diagram of RS232 communication

FIG. 9 is a CAN communication circuit diagram;

FIG. 10 is an EEPROM circuit diagram

FIG. 11-1 is a circuit diagram of a dip switch;

FIG. 11-2 is a circuit diagram of an indicator light;

FIG. 12 is a circuit diagram of the filter identification circuit;

FIG. 13 is a circuit diagram of a height lead position sensor identification circuit and a width lead position sensor identification circuit;

FIG. 14 is a circuit diagram of a safety position switch;

FIG. 15 is an interface connector connection circuit;

FIG. 16 is a circuit diagram of a rotary encoder;

FIG. 17 is a circuit diagram of an external key;

FIG. 18 is a circuit diagram of an interface of an LCD display;

fig. 19 is a schematic flow chart of the control circuit for controlling the operation of the beam limiter according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1, fig. 2, fig. 3-1, fig. 3-2, fig. 3-3, fig. 3-4, fig. 3-5, and fig. 3-6, in this embodiment, a DSP control chip of TMS320F28335 with PWM output control capability is used to control the start, stop, running direction, running speed, and the like of the 6-way dc motor, so that the 6-way dc motor drives the lead plate and the copper sheet of the filter to be precisely controlled.

Referring to fig. 4, the external interface needs to provide a DC24V or AC24V power supply voltage value to the power supply terminal of the harness device, and provides electric energy to the input terminal of the U1 step-down circuit (LM2596-5.0) after being rectified and filtered by the Z1 rectifier bridge circuit; the U1 voltage reduction circuit outputs stable DC5V voltage to the outside to supply power for other parts needing DC 5V; the DC5V outputs DC3.3V voltage to the outside after passing through a U2 voltage reduction circuit (TPS76833Q), and supplies power to a part requiring DC3.3V voltage, and at the moment, a D3 LED indicator lamp is turned on to indicate that DC3.3V supplies power normally.

One path of the DC5V outputs DC3.3V and DC1.9V voltages to the outside through a U3 voltage reduction circuit (TPS75701KTT), wherein DC1.9V supplies power to a TMS320F28335 control chip, and when a D4 LED indicator lamp is lightened, the power supply of DC1.9V is normal. DC3.3V supplies power to other parts needing DC3.3V, and the output current capacity of DC3.3V voltage in the whole control system is increased as the DC3.3V voltage output by the U2 voltage reduction circuit.

The 24_ DEC + and 24_ DEC-terminals are detected by pin 3 of S1(TLP290SE), and when the pin 3 voltage changes from high level to low level suddenly (i.e. there is a falling edge level) at a certain time, it indicates that the external power supply has started to stop supplying power, then the TMS320F28335 controls the chip to save the current data backup by using the externally released power stored in CH1, CH2 and C1, and S1(TLP290SE) only needs to supply power by DC 5V.

Referring to fig. 5, the RAM memory circuit is a high-speed static asynchronous memory circuit, and the connection relationship between the RAM memory circuit and the TMS320F28335 control chip is 19 address lines and 16 data lines; the 19 data lines have the addressing capability of 2^19, namely 512KB, and the space is accessible to the TMS320F28335 control chip; the 16 address lines illustrate that the addressing data is 16 bits. The IS61LV51216-10TI IS characterized by being fast, readable and writable, and the capacity of the TMS320F28335 control chip for processing various data and PWM (pulse-width modulation) for accurately controlling the direct current motor IS increased. After the power of the memory is cut off, the data stored in the memory can be lost, and no interference can be caused to new startup.

Referring to fig. 6-1, 6-2 and 6-3, the conventional beam limiter simulates the X-ray irradiation field by using a halogen lamp, the beam limiter of the present invention simulates the X-ray irradiation field by using a special LED lamp bead, and abandons the design concept that the halogen lamp has high heating power but unsatisfactory simulation effect, and adopts a U6(LM3409) control circuit which is powered by a DC24V power supply circuit, and controls the turning on and off of the LED lamp by a TMS320F28335 control chip through controlling the enabling or turning off of a third pin of U6, so as to control the turning on and off of the simulated X-ray irradiation field, and simultaneously, the turned on and turned off terminals also have N/a _ O and Fan _ O pins which play a role of turning on and off a heat dissipation Fan circuit of the LED lamp and a laser tube circuit to emit laser and dissipate heat of the LED lamp bead. The start-stop and operation time of the TMS320F28335 controller chip controls the TMS320F28335 controller chip.

Referring to fig. 7, the present invention additionally adopts the design of the RS485 communication circuit in the industry, and can perform communication and transmission of various data between devices following the same agreed protocol and the RS485 protocol, control the height, width, start/stop, stroke, etc. of the motors such as the filter, etc., and also control the start/stop and operation time of the LED lamp, the laser tube, the fan, etc., including the analog X-ray.

Referring to fig. 8, the present invention additionally adopts a design of an RS232 communication circuit in the industry, and can perform communication and transmission of various data between devices following the same agreed protocol and an RS232 protocol, control the height, width, start/stop, stroke, etc. of a motor such as a filter, and also control the start/stop and operation time of an LED lamp, a laser tube, a fan, etc. including an analog X-ray.

Referring to fig. 9, the present invention additionally adopts a design of a CAN communication circuit in the industry, and CAN perform communication and transmission of various data between devices following the same agreed protocol in a CAN protocol manner, control of the height, width, start/stop of motors such as a filter, and the like, and control of the start/stop and operation time of motors such as an LED lamp, a laser tube, and a fan including an analog X-ray.

Referring to fig. 10, the present invention additionally adopts the design of the EEPROM circuit in the industry, when the beam limiter defaults various data parameters in advance before leaving the factory, and when an error is found in the power-on self-test, the error information is immediately saved, and the correct information at the corresponding address position of U7(FM24CL64) is compared with the information just saved, and when the difference is found, the corresponding parameter information is corrected and set again.

When the 3 rd pin is detected at a certain time S1(TLP290SE), and when the voltage of the 3 rd pin changes from high level to low level suddenly (i.e. there is a falling edge level) at a certain time, it indicates that the external power supply has been stopped, the main control chip stores the current data backup at the corresponding address position of U7(FM24CL64) by using the externally released power stored in CH1, CH2 and C1, and the main control chip can still perform various self-settings according to the correct value at the previous time when the main control chip is turned on next time, which improves the convenience of operation and reduces the X-ray irradiation on the patient.

Referring to fig. 11-1 and 11-2, the design of the dial switch expands the application scenario of the wire harness device, and the switch states of the four dial switches on SW1 can be set to determine the operation mode of the four dial switches. That is, the ON state of Num1 can be set to the normal mode and the OFF mode to the device correction mode; the ON state of Num2 is CAN communication mode and the OFF mode is RS485 communication mode; the ON state of Num3 is RS232 communication mode and the OFF mode is RS232 mode is turned OFF; the ON state of Num4 is that the ON-OFF time of the LED lamp simulating the X-ray is 15s, and the OFF mode is that the ON-OFF time of the LED lamp simulating the X-ray is 30 s;

the flashing periods of D10, D11 represent the ON state or OFF state of Num1 ON S1. Num1 is in ON state when the flicker frequency is 500ms, Num1 is in OFF state when the flicker frequency is 2s, and the operation and maintenance personnel can directly observe the flicker frequency of the LED to judge the operation condition of the beam limiter.

Referring to fig. 12, one end of the wire filter is connected to the corresponding socket of the TMS320F28335 control chip through two connectors J12 and J14. The filter identification circuit comprises six ports F _ in1-F _ in6 capable of being identified by a TMS320F28335 control chip to be high and low, when the TMS320F28335 identifies that the level is high, it is indicated that no copper sheet shields the sensor at the corresponding position, otherwise, it is indicated that the copper sheet shields the sensor at the corresponding position.

Referring to fig. 13, when the height or width motor drives the lead plate to reach the maximum stroke, the position where the corresponding pins H _ Sensor _ I and W _ Sensor _ I are connected changes from high level to low level, so that the TMS320F28335 controls the chip to recognize, stop the operation of the motor, turn off and turn on D12 and D13, indicate that the current state reaches the maximum position, and then continue to increase the operation of the dc motor, which does not follow the change any more.

Referring to fig. 14, the Safety position switch prevents accidents that may be caused by the continuous operation of the motor after the height and width lead plate position sensors recognize that the lead plate driven by the motor reaches the maximum stroke, and identification circuits at four positions of Safety1-Safety4 respectively add one more identification confirmation mode after the four motors of M1-M4 operate to the maximum position, so that the probability of possible errors is reduced.

Referring to fig. 15, the connectors are connected by male and female connectors, which increases flexibility and cheapness of expansion, the same reference numerals indicate that there is a connection relationship between the connectors, and the J9 connector is a female part of the interface connector connection circuit, specifically connecting the LCD _ RS, LCD R/W, LCD _ E, LCD _ DB0-LCD _ DB7 including LCD display screen; l _ CHA, L _ CHB, R _ CHA and R _ CHB of the knob; and filter _ i, lamp _ i, memory _ i, fa + _ i, fa _iof the keys.

Referring to fig. 16, a circuit diagram of a rotary encoder is shown, and the rotary encoder is designed in a left-right two-way design, where L _ CHA and L _ CHB are left ways to control the operation of the lead plate of the height motor, and R _ CHA and R _ CHB are right ways to control the operation of the lead plate of the width motor. The phase difference between the L _ CHA and the L _ CHB is 90 degrees, the L _ CHA controls the lead plate to rotate clockwise, the opening and closing of the lead plate are controlled to be smaller and smaller, the L _ CHB controls the lead plate to rotate anticlockwise, and the opening and closing of the lead plate are controlled to be larger and larger; the phase difference between the R _ CHA and the R _ CHB is 90 degrees, the R _ CHA controls the lead plate to rotate clockwise, the opening and closing of the lead plate are controlled to be smaller and smaller, the R _ CHB controls the lead plate to rotate anticlockwise, and the opening and closing of the lead plate are controlled to be larger and larger;

the rotating speed of the motor is different according to different rotating speed degrees of the rotary encoder, so that the opening and closing speed of the lead plate is changed according to the speed of the motor, the design mode that only one speed runs and the rotary encoder needs to rotate for multiple circles is abandoned, and the efficiency of setting the position is greatly improved. After the pulse number changed after each rotation of the rotary encoder is identified and converted by a back electrode circuit, the pulse change number is captured by pins corresponding to L _ CHA, L _ CHB, R _ CHA, R _ CHB and TMS320F28335, and therefore the time for reaching the target position is calculated through a corresponding algorithm. Calibrating the change number of the rotary encoder every time to be Pluse, and when the Pluse > is 1& & Pluse < 3 pulses, judging that the TMS320F28335 main control chip algorithm is in a low-speed operation mode at the moment, and then operating at a low-gear speed set by the motor operation speed at the moment; when the pulse number is 4& & Pluse < ═ 6, the TMS320F28335 main control chip algorithm judges that the operation mode is a medium-speed operation mode at the moment, and the motor operates at the medium-speed set by the operation speed at the moment; when the pulse number of the.

Referring to fig. 17, for the external key circuit diagram, the man-machine interaction content is enriched by the external key circuit design, the manual operation beam limiter is more convenient, and the function is more perfect:

the filter _ i is a key for controlling the number selection of the copper sheets of the filter, the copper sheets are 0 in the default state, when the key is pressed for 1 time, 2 times and 3 times, the 1 piece of copper, the 2 piece of copper and the 3 piece of copper are respectively selected to shield the direct radiation of the X ray to the human body, the damage to the human body part is reduced as much as possible on the premise of finishing the X ray irradiation, and when the key is pressed for the 4 th time, the selected copper sheets are 0 to reciprocate.

The lamp _ i is a button for selecting the LED lamp simulating the X-ray to turn on and turn off the lamp, the LED lamp simulating the X-ray, the heat radiation fan, the laser tube and the like are simultaneously turned on when the lamp _ i button is pressed down, and the lamp _ i button is pressed down again within the countdown closing time to turn off the lamp.

The memory _ i key is a key for storing and setting the EEPROM of the current lead plate position and the number of copper sheets selected by the wire filter, the current value is recorded when the current value is pressed, and the current value can be immediately returned to the last recorded state when the current value is pressed again, so that an operator does not need to set the memory key every time.

fa + _ i and fa _iare up and down keys of the SID, which by default is 100cm, and is increased or decreased by 1cm for each key press. The maximum is increased to 360cm, and the minimum can be reduced to 65 cm.

Referring to fig. 18, it is a circuit diagram of an interface of an LCD display screen, where each position of the LCD display screen can display information such as the current position where the lead plate is driven by the height and width motor, the number of selected copper sheets, the SID size, the on/off state of the LED lamp simulating X-ray, the current communication mode and operation mode, etc. for easy visual observation.

Referring to fig. 19, it is a schematic flow chart of the control circuit for controlling the beam limiter to work according to the present invention: the method comprises the steps of firstly confirming whether the power is started for the first time when power is started, entering a calibration mode if the power is started for the first time, storing data at a corresponding position of an EEPROM circuit after calibration is finished, storing power failure data and other error information at other positions of the EEPROM circuit, directly entering an operation mode if the power is not started for the first time, reading internal values of the EEPROM circuit, such as the current height and width position of a lead plate and the default position where a copper sheet of a filter wire device runs, and displaying position information on a liquid crystal screen. According to the control mode, the CAN circuit, the RS485 circuit and the RS232 circuit operate and control the height lead plate control motor and the width lead plate control motor, the wire filter copper sheet controls the operation of the motors, the lamps, the fans and the laser tubes, and the function of executing the set action of the knobs or the keys, and simultaneously displays corresponding position information and key operation information on the liquid crystal screen.

When the beam limiter adopting the control circuit provided by the invention works, the rotary encoders on the left side and the right side CAN be controlled by manual operation to control the opening and closing sizes of the lead plates with the width and the height, and the opening and closing sizes of the lead plates with the width and the height CAN also be directly controlled by a CAN bus or RS232 and RS485 buses. The size of the Filter and the switch of the simulated LED lamp can be controlled by an external key circuit.

By adopting the control circuit, firstly, the traditional architecture mode of 'MCU + FPGA + two stepping motors' is changed into the architecture of 'DSP + four direct current motors + coded disc (for position closed-loop control)'; the running direction and the running speed of the motor are regulated and controlled by the DSP through PID. The Filter control uses two dc motors.

Secondly, a rotary cipher device which can be manually adjusted on a beam limiter panel can set the rotation speed of four direct current motors according to the rotation speed to control the lead plate to move, and the maximum irradiation field (or the minimum irradiation field) can be reached by rotating the lead plate for one circle at the fastest speed; the clockwise or anticlockwise rotating direction determines the rotating direction of the motor, and then the opening and closing of the height and width lead plates are pushed.

Thirdly, the invention has a one-key setting function, and can be set according to the empirical data of the part to be scanned of the patient, and the distance between the lead plates with the adjustable gaps can automatically follow the opening and closing size of the lead plates according to the selected mode. If the default size is not satisfied, any value in the maximum irradiation field range can be set according to actual needs.

Claims (8)

1. A beam limiter control circuit for controlling a lead plate to open and close through a direct current motor is characterized in that six direct current motor circuits are directly controlled through a DSP (digital signal processor) main control circuit with six or more PWM (pulse width modulation) controls, six direct current motors are respectively controlled through the six direct current motor circuits, and the six direct current motors respectively control the running directions of 2 height lead plates, 2 width lead plates and 2 wire filter copper sheets.

2. The beam limiter control circuit for controlling the opening and closing of the lead plate through the direct current motor according to claim 1, it is characterized by also comprising a power supply circuit, a JTAG circuit, an RAM storage circuit, an X-ray simulating LED lamp circuit, an LED lamp cooling fan circuit, a laser tube circuit, an RS485 communication circuit, an RS232 communication circuit, a CAN communication circuit, an EEPROM circuit, a dial switch and indicator lamp circuit, a wire filter identification circuit, a height lead plate position sensor identification circuit, a width lead plate position sensor identification circuit, a safety position switch circuit and an interface connector connecting circuit which are respectively connected with a DSP main control circuit with six or more PWM controls, wherein the interface connector connecting circuit is respectively connected with a rotary encoder circuit, an external key circuit and an LCD display screen interface circuit, the DSP main control circuit with six or more PWM controls adopts a TMS320F28335 control chip, and the TMS320F28335 control connection relation that the marks of each pin of the chip are consistent with the marks of each pin of other circuits is represented correspondingly.

3. The beam limiter control circuit for controlling the opening and closing of the lead plate through the direct current motor as claimed in claim 2, wherein the power supply circuit is used for rectifying, filtering and reducing the voltage provided by the external interface and then supplying power to different circuits, the power supply circuit comprises a Z1 rectifier bridge circuit, a U1 voltage reduction circuit and a U2 voltage reduction circuit which are connected in sequence, a U3 voltage reduction circuit is further connected between the U1 voltage reduction circuit and the U2 voltage reduction circuit, the Z1 rectifier bridge circuit rectifies and filters the DC24V or AC24V power voltage provided by the external interface, the U1 voltage reduction circuit outputs DC5V voltage externally and supplies power to the U2 voltage reduction circuit and the U3 voltage reduction circuit, the U2 voltage reduction circuit outputs DC3.3V voltage externally, the U3 voltage reduction circuit outputs DC3.3V and DC1.9V voltage externally, and the TMS320F28335 control chip is supplied with DC1.9V voltage;

the U1 voltage-reducing circuit adopts an LM2596-5.0 chip, the U2 voltage-reducing circuit adopts a TPS76833Q chip, the U3 voltage-reducing circuit adopts a TPS75701KTT chip, pin 1 and pin 4 of the Z1 rectifier bridge circuit output +24V voltage, pin 1 of the U1 voltage-reducing circuit is connected, pin 2 and pin 4 of the U1 voltage-reducing circuit output +5V voltage, pin 3 and pin 4 of the U2 voltage-reducing circuit are connected, pin 5 and pin 6 of the U2 voltage-reducing circuit output +3.3V voltage, pin 2 and pin 4 of the U1 voltage-reducing circuit are also connected with pin 5 and pin 6 of the U3 voltage-reducing circuit, pin 23 and pin 24 of the U3 voltage-reducing circuit output 1.9V voltage, pin 4, pin 15, pin 23, pin 29, pin 61, pin 101, pin 109, pin 117, pin 126, pin 139, pin 146, pin 154 and pin 167 of the TMS320F28335 control chip, and pin 2 and pin 6853 of the Z1 rectifier bridge circuit detect through pin 290 of the TLP chip, when the voltage at pin 3 of TLP290SE suddenly changes from high to low at a certain time, which indicates that the external power supply has stopped, TMS320F28335 controls the chip to save the current data backup by using the externally released power stored in capacitor CH1, capacitor CH2 and capacitor C1.

4. The beam limiter control circuit for controlling the opening and closing of the lead plate through the direct current motor according to claim 1 or 2, wherein the six direct current motor circuits comprise a clockwise operation circuit of the height lead plate motor, a counterclockwise operation circuit of the height lead plate motor, a clockwise operation circuit of the width lead plate motor, a counterclockwise operation circuit of the width lead plate motor, a clockwise operation circuit of the copper sheet motor of the wire filter and a counterclockwise operation circuit of the copper sheet motor of the wire filter;

the six direct current motor circuits are respectively supported by +24V voltage, a clockwise operation circuit of a height lead plate motor is connected with a pin 5 of a TMS320F28335 control chip, a counterclockwise operation circuit of the height lead plate motor is connected with a pin 6 of the TMS320F28335 control chip, a clockwise operation circuit of a width lead plate motor is connected with a pin 7 of the TMS320F28335 control chip, a counterclockwise operation circuit of the width lead plate motor is connected with a pin 10 of the TMS320F28335 control chip, a clockwise operation circuit of a copper sheet motor of a wire filter is connected with a pin 75 of the TMS320F28335 control chip, and the counterclockwise operation circuit of the copper sheet motor of the wire filter is connected with a pin 88 of the TMS320F28335 control chip;

the height lead plate motor clockwise operation circuit, the height lead plate motor anticlockwise operation circuit respectively control install height lead plate clockwise operation motor M1 and height lead plate anticlockwise operation motor M2 at both ends about same track, the width lead plate motor clockwise operation circuit, the width lead plate motor anticlockwise operation circuit respectively control install width lead plate clockwise operation motor M3 and width lead plate anticlockwise operation motor M4 at both ends about same track, filter copper sheet motor clockwise operation circuit and filter copper sheet motor anticlockwise operation circuit respectively control install filter copper sheet clockwise operation motor M5 and filter copper sheet anticlockwise operation motor M6 at both ends about same track.

5. The beam limiter control circuit for controlling the opening and closing of the lead plate through the direct current motor according to claim 2, wherein the RAM storage circuit is used for storing data and a standby program in the operation process of the device; the RS485 communication circuit, the RS232 communication circuit and the CAN communication circuit are all used for communication and data transmission and man-machine interaction control equipment, and the EEPROM circuit is used for setting default parameters before delivery, correcting data again when errors occur and backing up data when power is off;

the RAM storage circuit IS supported by +3.3V voltage, an IS61LV51216-10TI chip U5 IS adopted, and the connection relation with the TMS320F28335 control chip IS 19 address lines and 16 data lines; and the RS485 communication circuit, the RS232 communication circuit, the CAN communication circuit and the EEPROM circuit are respectively supported by +3.3V voltage.

6. The beam limiter control circuit for controlling the opening and closing of the lead plate through the direct current motor according to claim 2, wherein the LED lamp circuit simulating the X-ray is used for controlling the on and off of an LED lamp simulating the X-ray irradiation field, the LED lamp cooling fan circuit is used for starting and stopping a cooling fan to cool the LED lamp, and the laser tube circuit is used for starting and stopping a laser tube to emit laser;

the LED lamp circuit for simulating the X-ray is supported by +24V voltage, an LM3409 chip is adopted, and the LED lamp circuit is connected with a pin 13 of the TMS320F28335 control chip through a pin 3; the LED lamp cooling fan circuit is supported by +24V voltage, a Melx533750410 chip is connected with a pin 11 of a TMS320F28335 control chip, and the laser tube circuit is supported by +5V voltage, a Melx533750410 chip is also connected with a pin 12 of the TMS320F28335 control chip.

7. The control circuit of the beam limiter for controlling the opening and closing of the lead plate through the direct current motor according to claim 2, wherein the dial switch and the indicator light circuit are used for controlling the switching states and the operation modes of a plurality of dial switches on the beam limiter and the flashing period of the indicator light, the wire filter identification circuit is used for identifying whether a copper sheet of the wire filter shields a sensor at a corresponding position, the height lead plate position sensor identification circuit is used for identifying whether the height lead plate runs to a maximum stroke position, the width lead plate position sensor identification circuit is used for identifying whether the width lead plate runs to a maximum stroke position, and the safety position switch circuit is used for identifying whether the height lead plate and the width lead plate exceed the maximum stroke position;

the dial switch and the indicating lamp circuit are supported by +3.3V voltage, and are connected with a pin 89, a pin 90, a pin 91, a pin 94, a pin 73 and a pin 74 of the TMS320F28335 control chip by adopting an SMD-SW-1.27 chip; the identification circuit of the wire filter is supported by +5V voltage, and 2 Melx533750510 chips are adopted to be connected with a pin 95, a pin 96, a pin 97, a pin 98, a pin 99 and a pin 100 of a TMS320F28335 control chip; the height lead plate position sensor identification circuit and the width lead plate position sensor identification circuit are supported by +5V voltage, and are connected with a pin 21 and a pin 24 of a TMS320F28335 control chip by adopting a Melx533750510 chip; the safe position switch circuit is supported by +5V voltage, and two Melx533750510 chips are adopted to be connected with a pin 27, a pin 28, a pin 62 and a pin 63 of a TMS320F28335 control chip.

8. The beam limiter control circuit for controlling the opening and closing of the lead plate through the direct current motor according to claim 2, wherein the interface connector connecting circuit is used for respectively connecting the DSP main control circuit with six or more PWM controls with the rotary encoder circuit, the external key circuit and the LCD display interface circuit, the rotary encoder circuit is used for adjusting and controlling the rotation speed of the 2 height lead plate operation motors and the rotation speed of the 2 width lead plate operation motors, the external key circuit is used for controlling the number of X-ray sheltered by the copper sheets of the filter, controlling whether to turn on the LED lamp, the cooling fan and the laser tube simulating the X-ray, controlling and storing the current lead plate position and the number of the copper sheets of the filter, and controlling the distance of SID, and the LCD display interface circuit is used for accessing the LCD display;

interface connector piece connecting circuit passes through +5V voltage support, adopts T812130A100CEU or AEHW30G0502-T-R chip, one side with the corresponding pin of TMS320F28335 control chip is connected, and rotary encoder circuit, outside key circuit and LCD display screen interface circuit are connected through the corresponding pin to the opposite side, and rotary encoder circuit, outside key circuit and LCD display screen interface circuit all support through +5V voltage.

Images