Closed-loop control circuit of portable infrared thermal imaging detector electric target wheel

Abstract

The utility model relates to a closed-loop control circuit of an electric target wheel of a portable infrared thermal imaging detector, which belongs to the technical field of infrared thermal imaging detectors and comprises a motor, a control circuit and a power supply circuit. The encoder is used for sending the position information of the target wheel in real time; the main control circuit is electrically connected with an external power supply and the encoder, and is used for converting the voltage of the external power supply to supply power to the motor and the encoder, and sending a target direction and a pulse quantity after receiving the position information; and the motor driver is electrically connected with the main control circuit and the motor and is used for driving the motor to rotate to a target position after receiving the target direction and the pulse quantity. According to the utility model, the technical problems that the prior art is poor in practicability and can only adapt to a single-model motor are effectively solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to infrared thermal imaging detector technical field especially, it relates to a portable infrared thermal imaging detector electric target wheel's closed loop control circuit. BACKGROUND

[0002] Portable infrared thermal imaging detector adopts coaxial cassegrain optical system, SURF feature detection and matching, motor automatic control, subpixel subdivision etc. technology, portable field infrared thermal imaging detector can realize the indoor and outdoor digitization test of the parameters such as the start-up time, uniformity, blind element rate, blind element distribution, MRTD, field of view, zero walking amount of the equipment to be measured, and each function needs to use a variety of different targets for testing, and the electric target wheel is more and more widely used.

[0003] At present, most of the target wheels used in the market are driven by motor drive boards and closed-loop motors (motor and incremental encoder integrated), which simplifies the structure, but the incremental encoder has the problems of poor positioning accuracy, insufficient reset accuracy, poor anti-interference performance, the need to match zero optical coupler, and the problem that a single type of motor can only be adapted to a single type of drive board. UTILITY MODEL CONTENT

[0004] Therefore, it is necessary to provide a portable infrared thermal imaging detector electric target wheel's closed loop control circuit to solve the technical problem that the prior art has poor practicability and can only adapt to a single type of motor.

[0005] To solve the above problems, the utility model provides a portable infrared thermal imaging detector electric target wheel's closed loop control circuit, which comprises:

[0006] The motor is used to drive the target wheel to rotate.

[0007] The encoder is used to send the position information of the target wheel in real time.

[0008] The main control circuit is electrically connected with the external power supply and the encoder, is used to convert the voltage of the external power supply to power the motor and the encoder, and send the target direction and pulse quantity after receiving the position information.

[0009] The motor driver is electrically connected with the main control circuit and the motor, and is used to drive the motor to rotate to the target position after receiving the target direction and pulse quantity.

[0010] In a possible implementation, the main control circuit comprises: a power protection module, a voltage conversion module, a communication module, a motor driving module and a main control chip.

[0011] The power protection module is electrically connected with the external power supply, is used to cut off the power supply when the current of the main control circuit is higher than the preset working current, and is used to reconnect the power supply when the current returns to normal.

[0012] The voltage conversion module is electrically connected with the encoder, the motor driver, the power protection module, the communication module, the motor driving module and the master control chip, and is used for converting the voltage of the external power supply into a voltage supporting the normal work of the encoder, the motor driver, the power protection module, the communication module, the motor driving module and the master control chip;

[0013] The communication module is in communication connection with the external host computer, the master control chip and the encoder, and is used for transmitting the specified target position information sent by the external host computer and the position information sent by the encoder to the master control chip;

[0014] The master control chip is electrically connected with the motor driving module, and is used for sending the target direction and the pulse quantity to the motor driving module after receiving the specified target position information and the position information;

[0015] The motor driving module is electrically connected with the motor driver, and is used for transmitting the target direction and the pulse quantity to the motor driver, so that the motor driver drives the motor to rotate to the target position.

[0016] In a possible implementation, the power protection module comprises a self-recovery fuse, a diode and a voltage stabilizing tube;

[0017] The self-recovery fuse is electrically connected with the positive electrode of the external power supply and the anode of the diode;

[0018] The cathode of the diode is electrically connected with the cathode of the voltage stabilizing tube;

[0019] The anode of the voltage stabilizing tube is electrically connected with the negative electrode of the external power supply.

[0020] In a possible implementation, the voltage conversion module comprises a 12V-to-5V converter, a 5V-to-3.3V converter, a 12V-to-6V converter and a 12V-to-12V converter;

[0021] The 12V-to-5V converter is electrically connected with the communication module;

[0022] The 12V-to-12V converter is electrically connected with the motor driver and the encoder;

[0023] The 12V-to-6V converter is electrically connected with the motor driving chip;

[0024] The 5V-to-3.3V converter is electrically connected with the master control chip.

[0025] In a possible implementation, the 12V-to-12V converter is of model BNX016-01, the 12V-to-5V converter is of model AXA005A0XZ, the 5V-to-3.3V converter is of model KF33BDT, and the 12V-to-6V converter is of model PTN78060WAH.

[0026] In a possible implementation, the communication module comprises an RS232 communication chip and an RS422 communication chip.

[0027] The RS232 communication chip is of model MAX232EESA, and is configured to receive the specified target position information sent by the host computer and transmit the specified target position information to the main control chip.

[0028] The RS422 communication chip is of model MAX488ESA, and is configured to receive the position information transmitted by the encoder and transmit the position information to the main control chip.

[0029] The two isolation chips are both of model HCPL-0931.

[0030] The two isolation chips are both in communication connection with the RS232 communication chip and the main control board, and are configured to perform isolation processing on the specified target position information sent by the host computer and transmit the specified target position information to the main control board.

[0031] In a possible implementation, the motor driving module comprises a direct-current motor driving chip of model TC298.

[0032] In a possible implementation, the motor is a direct-current stepping motor, and is of model 42-20 single-output shaft motor.

[0033] In a possible implementation, the main control chip is of model STM32F407VGT6.

[0034] In a possible implementation, the motor driver comprises a stepping motor driver of model UIM240L02P.

[0035] In a possible implementation, the main control chip is of model STM32F407VGT6.

[0036] In a possible implementation, the motor driver comprises a stepping motor driver of model UIM240L02P.

[0037] The utility model discloses a portable infrared thermal imaging detector motor target wheel's closed loop control circuit, including main control circuit, motor, motor driver and encoder, wherein, the main control circuit is received after the angle position information of encoder transmission, according to the current position information, calculates the output direction and step pulse amount, then the output direction and step pulse amount are sent to motor driver, and then by motor driver drive motor carries out target amount rotation, until reaches target position stop, realizes motor drive's closed loop control, improves the positioning accuracy, reset accuracy and anti -interference, and need not match zero position photocoupler uses, and the utility model not only can adapt to contain a variety of target motor target wheel rotation mechanism, and not limited to direct current or stepper motor, incremental encoder or absolute encoder, effectively solved the prior art practicality is poor, can only adapt to single model motor's technical problem. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 The utility model provides a portable infrared thermal imaging detector motor target wheel's closed loop control circuit one embodiment's structure schematic diagram. DETAILED DESCRIPTION

[0039] It should be understood that the specific embodiments described herein are merely intended to explain the present utility model and are not intended to limit the present utility model.

[0040] The technical solutions in the embodiments of the utility model will be clearly and completely described with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model and not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0041] It should be noted that all the directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the utility model are only used to explain the relative position relationship, movement condition, etc. between the components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directionality indications will also change accordingly.

[0042] In addition, the description involving "first", "second" and the like in the utility model is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the same or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the utility model.

[0043] In this paper, the "embodiment" means that the specific features, structures or characteristics described in conjunction with the embodiment can be included in at least one embodiment of the utility model. The phrase appears at various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is not mutually exclusive with other embodiments. The person skilled in the art explicitly and implicitly understands that the embodiments described herein can be combined with other embodiments.

[0044] As Figure 1 shown, one specific embodiment of the utility model discloses a kind of closed-loop control circuit 10 of portable infrared thermal imaging detector motor target wheel, comprising:

[0045] Motor 110 is used to drive target wheel to rotate;

[0046] Encoder 120 is used to send the position information of target wheel in real time;

[0047] Main control circuit 130 is electrically connected with external power supply and encoder 120, for converting the voltage of external power supply to power supply encoder 120, and after receiving position information, target direction and pulse quantity are sent;

[0048] Motor driver 140 is electrically connected with main control circuit 130 and motor 110, for driving motor 110 to rotate to target position after receiving target direction and pulse quantity.

[0049] Compared with the prior art, the utility model provides a closed-loop control circuit for an electric target wheel of a portable infrared thermal imaging detector, comprising a main control circuit, a motor, a motor driver and an encoder, wherein the main control circuit calculates the output direction and the step pulse amount according to the current position information after receiving the angular position information sent by the encoder, and then sends the output direction and the step pulse amount to the motor driver, which then drives the motor to rotate the target amount until it reaches the target position and stops, thereby realizing closed-loop control of the motor drive, improving positioning accuracy, reset accuracy and anti-interference ability, and does not need to be used with a zero-position optocoupler. Moreover, the utility model can not only be adapted to electric target wheel rotation mechanisms containing a variety of targets, but is not limited to DC or stepper motors, incremental encoders or absolute encoders, effectively solving the technical problem that the prior art has poor practicality and can only be adapted to a single model of motor.

[0050] In a possible implementation, the main control circuit 130 includes: a power protection module, a voltage conversion module, a communication module, a motor drive module and a main control chip;

[0051] The power protection module is electrically connected to the external power supply and is used to cut off the power supply when the current of the main control circuit exceeds the preset working current, and to re-enable the power supply after the current returns to normal;

[0052] The voltage conversion module is electrically connected to the encoder, motor driver, power protection module, communication module, motor driver module and main control chip, and is used to convert the voltage of the external power supply into a voltage that supports the normal operation of the encoder, motor driver, power protection module, communication module, motor driver module and main control chip;

[0053] The communication module is connected to the external host computer, the main control chip and the encoder for transmitting the designated target position information sent by the external host computer and the position information sent by the encoder to the main control chip;

[0054] The main control chip is electrically connected to the motor drive module and is used to receive the designated target position information and send the target direction and pulse amount to the motor drive module after the position information;

[0055] The motor drive module is electrically connected to the motor driver and is used to transmit the target direction and pulse amount to the motor driver so that the motor driver drives the motor to rotate to the target position.

[0056] In one possible implementation, the power protection module includes a resettable fuse, a diode, and a voltage regulator tube;

[0057] Wherein, the resettable fuse is electrically connected to the positive electrode of the external power supply and the anode of the diode;

[0058] The cathode of the diode is electrically connected to the cathode of the voltage regulator tube;

[0059] The anode of the voltage stabilizing tube is electrically connected with the negative pole of the external power supply.

[0060] Exemplarily, the self-restoring fuse can adopt an RL72-185 type self-restoring fuse, which ensures that the power supply can be quickly cut off in the presence of an abnormal situation higher than the working current, protecting the main control circuit from damage, and automatically starting the power-on work when the circuit returns to normal. The diode can adopt an SK56C R6 type diode, which mainly prevents damage to the circuit caused by reverse connection of the positive and negative poles of the power supply. The voltage stabilizing tube can adopt an SMAJ33(C)A type voltage stabilizing tube, which ensures that the input power supply can be stably input into the subsequent circuit when fluctuations occur.

[0061] In a possible implementation, the voltage conversion module includes a 12V-to-5V converter, a 5V-to-3.3V converter, a 12V-to-6V converter, and a 12V-to-12V converter;

[0062] The 12V-to-5V converter is electrically connected with the communication module;

[0063] The 12V-to-12V converter is electrically connected with the motor driver and the encoder;

[0064] The 12V-to-6V converter is electrically connected with the motor driving chip;

[0065] The 5V-to-3.3V converter is electrically connected with the main control chip.

[0066] In a possible implementation, the model before the 12V-to-12V is BNX016-01; the model of the 12V-to-5V converter is AXA005A0XZ; the model of the 5V-to-3.3V converter is KF33BDT; and the model of the 12V-to-6V converter is PTN78060WAH.

[0067] In a possible implementation, the communication module includes an RS232 communication chip and an RS422 communication chip;

[0068] The model of the RS232 communication chip is MAX232EESA, which is used to receive the specified target position information sent by the host computer and transmit the information to the main control chip;

[0069] The model of the RS422 communication chip is MAX488ESA, which is used to receive the position information transmitted by the encoder and transmit the information to the main control chip;

[0070] The models of the two isolation chips are both HCPL-0931;

[0071] The two isolation chips are both in communication connection with the RS232 communication chip and the main control board, and are used to isolate and process the specified target position information sent by the host computer and transmit the information to the main control board.

[0072] It should be noted that the master chip is used for receiving the angle position information transmitted by the absolute encoder, and is also used for comparing the received current position information of the target wheel with the position information of each preset target on the target wheel, calculating the position deviation, outputting the calculated rotation direction and step pulse quantity to the motor driver, and driving the motor to rotate to the target position and stop.

[0073] In a possible implementation, the motor driving module comprises a direct current motor driving chip, which is model TC298.

[0074] In a possible implementation, the motor is a direct current stepping motor, which is a 42-20 single-shaft motor, and has small volume, low power consumption, and a step angle precision of ±5%.

[0075] In a possible implementation, the master chip is model STM32F407VGT6.

[0076] In a possible implementation, the motor driver comprises a stepping motor driver, which is model UIM240L02P, and has the advantages of small volume, strong driving force, wide input voltage range, high-speed current compensation function, and the like.

[0077] In a possible implementation, the master chip is model STM32F407VGT6 single-chip microcomputer, which is mainly responsible for receiving the control instruction of the upper computer, collecting the real-time position data output by the absolute encoder, comparing the position with the target specified in the instruction of the upper computer, calculating the direction and specific angle difference of the motor rotation, sending the calculated pulse quantity to the motor driver, driving the motor to drive the target wheel to move to the target position, and stopping the motor target wheel control.

[0078] In a possible implementation, the motor driver comprises a stepping motor driver, which is model UIM240L02P.

[0079] The above is only a preferred specific implementation of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A closed-loop control circuit for an electric target wheel of a portable infrared thermal imaging detector, characterized in that: include: A motor, used for driving the target wheel to rotate; Encoder, used to send the position information of the target wheel in real time; A main control circuit is electrically connected to the external power supply and the encoder, and is used to convert the voltage of the external power supply to power the motor and the encoder, and send the target direction and pulse amount after receiving the position information; The motor driver is electrically connected to the main control circuit and the motor, and is used to drive the motor to rotate to the target position after receiving the target direction and pulse amount.

2. The closed-loop control circuit according to claim 1, characterized in that: The main control circuit includes: a power protection module, a voltage conversion module, a communication module, a motor drive module and a main control chip; The power protection module is electrically connected to the external power supply and is used to cut off the power supply when the current of the main control circuit exceeds the preset working current, and to re-enable the power supply after the current returns to normal; The voltage conversion module is electrically connected to the encoder, motor driver, power protection module, communication module, motor driver module and main control chip, and is used to convert the voltage of the external power supply into a voltage that supports the normal operation of the encoder, motor driver, power protection module, communication module, motor driver module and main control chip; The communication module is connected to the external host computer, the main control chip and the encoder for transmitting the designated target position information sent by the external host computer and the position information sent by the encoder to the main control chip; The main control chip is electrically connected to the motor drive module and is used to receive the designated target position information and send the target direction and pulse amount to the motor drive module after the position information; The motor drive module is electrically connected to the motor driver and is used to transmit the target direction and pulse amount to the motor driver so that the motor driver drives the motor to rotate to the target position.

3. The closed-loop control circuit according to claim 2, characterized in that: The power protection module includes a resettable fuse, a diode and a voltage regulator tube; Wherein, the resettable fuse is electrically connected to the positive electrode of the external power supply and the anode of the diode; The cathode of the diode is electrically connected to the cathode of the voltage regulator tube; The anode of the voltage regulator tube is electrically connected to the negative electrode of the external power supply.

4. The closed-loop control circuit according to claim 2, wherein: The voltage conversion module includes a 12V to 5V converter, a 5V to 3.3V converter, a 12V to 6V converter, and a 12V to 12V converter; Wherein, the 12V to 5V converter is electrically connected to the communication module; The 12V to 12V converter is electrically connected to the motor driver and encoder; The 12V to 6V converter is electrically connected to the motor driver chip; The 5V to 3.3V converter is electrically connected to the main control chip.

5. The closed-loop control circuit according to claim 4, characterized in that: The model of the 12V to 12V converter is BNX016-01; the model of the 12V to 5V converter is AXA005A0XZ; the model of the 5V to 3.3V converter is KF33BDT; and the model of the 12V to 6V converter is PTN78060WAH.

6. The closed-loop control circuit according to claim 2, characterized in that: The communication module includes: an RS232 communication chip, an RS422 communication chip and two isolation chips; The model of the RS232 communication chip is MAX232EESA, which is used to receive the designated target position information sent by the host computer and transmit it to the main control chip; The RS422 communication chip model is MAX488ESA, which is used to receive the position information transmitted by the encoder and transmit it to the main control chip; The model of both isolation chips is HCPL-0931; The two isolation chips are both connected to the RS232 communication chip and the main control board for communication, and are used to isolate and process the designated target position information sent by the host computer and transmit it to the main control board.

7. The closed-loop control circuit according to claim 2, characterized in that: The motor drive module includes: a DC motor drive chip, model TC298.

8. The closed-loop control circuit according to claim 2, wherein: The motor is a DC stepper motor, model 42-20 single-output shaft motor.

9. The closed-loop control circuit according to claim 2, characterized in that: The main control chip model is STM32F407VGT6.

10. The closed-loop control circuit according to claim 1, wherein: The motor driver includes: a stepper motor driver, model UIM240L02P.

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