WO2022001206A1

WO2022001206A1 - Control circuit and control method for measuring light source parameters

Info

Publication number: WO2022001206A1
Application number: PCT/CN2021/081734
Authority: WO
Inventors: 李志荣
Original assignee: 广东奥普特科技股份有限公司
Priority date: 2020-07-03
Filing date: 2021-03-19
Publication date: 2022-01-06
Also published as: CN111800906A

Abstract

A control circuit for measuring light source parameters, comprising a light source controller and visual light sources. The light source controller is provided with a master control module, driving modules, and communication modules. Each of the visual light sources is provided with a visual light source control module and an LED module, wherein each driving module is separately connected to the master control module, the visual light source control module, and the LED module; each communication module is separately connected to the master control module and the visual light source control module; and the visual light source control module is used for storing and outputting a voltage parameter, a current parameter, and a duty ratio parameter of the visual light source. The present invention solves the technical problem of how to improve the measurement precision of visual light source parameters, and improves the control capability for measurement of the light source parameters. Moreover, the present invention provides a control method for measuring light source parameters.

Description

A control circuit and control method for detecting light source parameters

This application claims the priority of the Chinese patent application with the application number 202010631413.5 and the invention titled "A Control Circuit and Control Method for Detecting Light Source Parameters" filed with the China Patent Office on July 3, 2020, the entire contents of which are incorporated by reference in this application.

technical field

The invention belongs to the technical field of semiconductor integrated circuits, and in particular relates to a control circuit and a control method for detecting light source parameters.

Background technique

The light source is the core component of the machine vision industry. With the development of the machine vision industry, people's requirements for the light source in the machine vision equipment have become higher and higher. Light source parameters marked with rated voltage and current can no longer meet the needs of use, and parameters such as instantaneous excess voltage and current and duty cycle need to be marked.

The existing light source controller detects the voltage and current of the visual light source through the ADC, which has low accuracy and is greatly affected by temperature. In addition, the existing light source controller cannot detect parameters such as excess voltage, current and duty cycle of the visual light source, and can only be set manually. At the same time, the control circuit of the current visual light source controller has poor control performance and slow response speed, and cannot form a set of control methods for effectively detecting light source parameters.

Therefore, it is urgent to propose a novel control circuit and control method to solve the above problems.

SUMMARY OF THE INVENTION

One of the objectives of the present invention is to provide a control circuit for detecting light source parameters in view of the deficiencies of the prior art, which solves the technical problem of how to improve the detection accuracy of visual light source parameters and improves the control ability for detecting light source parameters.

In order to achieve the above object, the present invention adopts the following technical solutions:

A control circuit for detecting light source parameters, comprising a light source controller and a visual light source, the light source controller is provided with a main control module, a driving module and a communication module, the visual light source is provided with a visual light source control module and an LED module, the The driving module is respectively connected with the main control module and the LED module, the communication module is connected with the main control module and the visual light source control module respectively, and the visual light source control module is used for storing and outputting the visual light source The voltage parameters, current parameters, and duty cycle parameters of the light source.

Further, the main control module is provided with a first control unit, the first control unit is connected with the communication module, and the communication module is an RS485 chip.

Further, the visual light source control module is provided with a voltage adjustment unit and a second control unit, the voltage adjustment unit is connected with the power supply end of the light source controller, and the second control unit is connected with the communication module.

Further, the first control unit and the second control unit are both STM32F103 chips, and the voltage adjustment unit is an LM1117 chip.

Further, the visual light source control module is provided with a signal processing unit, and the signal processing unit is respectively connected with the communication module and the second control unit.

Further, the signal processing unit is an RS485 chip, and the RS485 chip is respectively connected with the communication module and the second control unit.

Further, the driving module is provided with an operational amplifier unit and a power regulation unit, the operational amplifier unit is connected to the power regulation unit, and the operational amplifier unit and the power regulation unit form a negative feedback constant current circuit.

Further, the operational amplifier unit is connected to the first control unit, the power control unit is connected to the LED module, and the power control unit is used to increase output power and drive current, and the LED module includes The resistor and several LED lamps are connected in series with the resistor and several LED lamps.

Further, the operational amplifier unit is an LM258 operational amplifier chip, the power control unit is an N-channel MOS tube, and the model of the N-channel MOS tube is IRLZ44N.

Another object of the present invention is to provide a control method for detecting light source parameters, comprising the following steps:

S1: The main control module makes the drive module turn off the output, and the input and output of the communication module are in a high resistance state;

S2: make the output of the communication module be a normal output state, and make the communication module send a signal to the visual light source, make the input of the communication module be a normal input state, wait for the signal sent by the visual light source;

S3: Determine the type of the signal sent by the visual light source, and the main control module controls the output of the driving module according to the received signal, and controls the operation of the LED module.

Further, in the S3, if the main control module can normally receive the signal command, the main control module parses the received signal command, and controls the drive module according to the parsed information, the The driving module controls the operation of the LED module.

Further, in the S3, if the main control module does not receive a return signal from the visual light source within a preset time, the driving module is controlled to turn off the output.

The beneficial effects of the present invention are: 1) the light source controller of the present invention is provided with a main control module, a driving module and a communication module, the visual light source is provided with a visual light source control module and an LED module, and the visual light source control module is used for storing and outputting the visual light source The voltage parameters, current parameters and duty cycle parameters of the visual light source can effectively detect the parameters such as excess voltage, current and duty cycle of the visual light source; 2) The drive module is respectively connected with the main control module and the LED module, and the communication module is respectively connected with the main control module. It is connected with the visual light source control module. Under the control of the main control module, the visual light source control module sends the parameters of the visual light source to the main control module through the communication module. The main control module, the communication module and the visual light source control module have good running stability, The response speed is fast, which significantly improves the detection accuracy of visual light source parameters; 3) The main control module controls the driving module by analyzing the parameters, and the driving module controls the operation of the LED module according to the instructions of the main control module, which meets the control requirements for light source parameters. 4) The control method for detecting light source parameters of the present invention improves the control ability for detecting light source parameters.

Description of drawings

FIG. 1 is a schematic diagram of the frame of the control circuit of the present invention.

FIG. 2 is a schematic circuit diagram of the main control module of the light source controller of the present invention.

FIG. 3 is a schematic circuit diagram of the driving module and the communication module of the light source controller of the present invention.

FIG. 4 is a schematic circuit diagram of the visual light source of the present invention.

FIG. 5 is a flow chart of the control method of the present invention.

Among them: 1-light source controller; 2-visual light source; 11-main control module; 12-drive module; 13-communication module; 21-visual light source control module; 22-LED module.

detailed description

If certain terms are used in the description and claims to refer to specific components, those skilled in the art should understand that manufacturers may use different terms to refer to the same component. The description and claims do not use the difference in name as a way to distinguish components, but use the difference in function of the components as a criterion for distinguishing. As mentioned in the entire specification and claims, "comprising" is an open-ended term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve technical problems within a certain error range, and basically achieve technical effects.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", horizontal" etc. is based on the accompanying drawings The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a reference to the present invention. limits.

In the invention, unless otherwise expressly specified and limited, the terms "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection, Or integrally connected; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication between the two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

The present invention will be described in further detail below with reference to the accompanying drawings 1 to 5 and specific embodiments, but it is not intended to limit the present invention.

Example 1

A control circuit for detecting light source parameters, including a light source controller 1 and a visual light source 2, the light source controller 1 is provided with a main control module 11, a driving module 12 and a communication module 13, and the visual light source 2 is provided with a visual light source control module 21 and LEDs Module 22, the driving module 12 is respectively connected with the main control module 11 and the LED module 22, the communication module 13 is respectively connected with the main control module 11 and the visual light source control module 21, the visual light source control module 21 is used for storing and outputting the voltage of the visual light source 2 parameters, current parameters, duty cycle parameters.

Preferably, the main control module 11 is provided with a first control unit, the visual light source control module 21 is provided with a voltage adjustment unit and a second control unit, the voltage adjustment unit is connected to the power supply end of the light source controller 1, the first control unit and the second control unit The control units are all connected with the communication module 13, and the communication module 13 is an RS485 chip.

Preferably, the first control unit and the second control unit are both STM32F103 chips, the voltage adjustment unit is an LM1117 chip, and the LM1117 chip can output a fixed voltage.

Preferably, the visual light source control module 21 is provided with a signal processing unit, the signal processing unit is an RS485 chip, and the RS485 chip is respectively connected to the communication module 13 and the second control unit.

Preferably, the driving module 12 is provided with an operational amplifier unit and a power regulation unit, and the operational amplifier unit is connected to the power regulation unit.

Preferably, the operational amplifier unit is connected to the first control unit, and the power control unit is connected to the LED module 22 .

Preferably, the operational amplifier unit is an LM258 operational amplifier chip, the power control unit is an N-channel MOS tube, and the model of the N-channel MOS tube is IRLZ44N.

The operation process of the present invention includes:

Signal description:

LED+/LED-: The light source controller 1 provides the positive and negative poles of the electrical energy to the LED module 22 in the visual light source 2;

Power+/Power-: The light source controller 1 provides the positive and negative poles of electrical energy to the main control module 21 of the visual light source, and the voltage adjustment unit is connected to the Power+/Power- power supply terminal of the light source controller 1;

Data-p/Data-n: a pair of differential communication lines between light source controller 1 and visual light source 2;

RX/TX: the receiving/transmitting line of the data bus between the main control module 11 of the light source controller 1 and the communication module 13;

RE-1...N/TE-1...N: The output state control line of the communication module 13, the input and output are in the high resistance state by default when powered on.

1. The operation process of the light source controller includes:

(1) The main control module 11 of the light source controller 1 turns off the outputs of the N driving modules 12; the STM32F103 chip of the main control module 11 controls RE-1...N/TE-1...N to be high and low respectively The level makes the input and output of the N communication modules 13 in a high resistance state; wherein, the STM32F103 chip of the main control module 11 can make its two internal DAC1 and DAC2 channels output 0V, so that the output current of all the driving modules 12 is 0.

(2) The STM32F103 chip of the main control module 11 controls RE-1/TE-1 to output a low level and a high level respectively, so that the output of the first communication module 13 is valid, and sends a signal to the first communication module 13 through the serial port 1 of the communication module 13. Visual light source 2 connected to each communication module 13; control RE-1/TE-1 to output low level to make the input of the first communication module 13 valid, the serial port 1 of the communication module 13 waits for the signal sent by the visual light source 2, if it can If the command is received normally, it means that the visual light source 2 is connected to the first communication module 13. At this time, the main control module 11 of the light source controller 1 parses the command according to the received command, and analyzes the voltage, current, duty cycle, etc. The information controls the parameters such as voltage, current and duty output by the first drive module 12, so as to achieve accurate detection and control of the visual light source parameters. Among them, the main control module 11 makes the DAC1 channel of the STM32F103 chip output the corresponding voltage according to the parsed current information. , the first drive module 12 outputs the corresponding current under the control of the main control module 11; if the return signal from the visual light source 2 is not received after waiting for a period of time, it means that the light source is not inserted, and the DAC1 of the STM32F103 chip of the main control module 11 The channel outputs 0V, and the current of the first driving module 12 is 0, thereby controlling the first driving module 12 to turn off the output.

(3) The main control module 11 of the light source controller 1 controls RE-1...N/TE-1...N to be high level and low level respectively, so that the input and output of the N communication modules 13 are in a high resistance state.

(4) The STM32F103 chip of the main control module 11 controls RE-2/TE-2 to output a low level and a high level respectively, so that the output of the second communication module 13 is valid, and sends a signal to the visual connected to the second communication module 13. Light source 2; control RE-2/TE-2 to output low level to make the input with the second communication module 13 valid, and wait for the signal sent by visual light source 2. If the command can be received normally, it means that visual light source 2 is connected to the first Two communication modules 13, at this time, the main control module 11 of the light source controller 1 parses the command according to the received command, and controls the output voltage, parameters such as current and duty, so as to accurately detect and control the parameters of the visual light source. Among them, the main control module 11 makes the DAC2 channel of the STM32F103 chip output the corresponding voltage according to the parsed current information, and the second drive module 12 in the main control module 11 The corresponding current is output under the control of the main control module 11; if the return signal from the visual light source 2 is not received after waiting for a period of time, it means that the light source is not inserted, the DAC2 channel of the STM32F103 chip of the main control module 11 outputs 0V, and the current of the second drive module 12 is 0, and controls the second driving module 12 to turn off the output.

(5) The main control module 11 of the light source controller 1 controls RE-1...N/TE-1...N to be high level and low level respectively, so that the input and output of the N communication modules 13 are in a high resistance state.

(6) The control method similar to (2)-(5) completes the detection of whether there is a visual light source inserted or pulled out in the circuit.

(7) The main control module 11 of the light source controller 1 controls RE-1...N/TE-1...N so that the input and output of the N communication modules are in a high resistance state. Return to the (2) cycle.

2. The operation process of the visual light source includes:

(1) The control signal input of the visual light source control module 21 is valid, wherein, the visual light source control module 21 is provided with the connected STM32F103 chip and the RS485 chip, and the STM32F103 chip controls the RS485 RE/DE are both low level to make the signal input valid.

(2) The serial port 1 of the STM32F103 chip of the visual light source control module 21 waits for the signal sent by the light source controller 1 .

(3) After the serial port 1 of the STM32F103 chip of the visual light source control module 21 correctly receives the signal sent by the light source controller 1, it controls the RE/DE of the RS485 to be low level and high level respectively to make the signal output valid, and the visual light source The parameters such as voltage, current and duty cycle of 2 are sent to the light source controller 1, and return to (1).

Example 2

A control method for detecting light source parameters, comprising the following steps:

S1: the main control module 11 makes the drive module 12 turn off the output, and the input and output of the communication module 13 are in a high resistance state;

S2: The main control module 11 makes the output of the communication module 13 be in a normal output state, and makes the communication module 13 send a signal to the visual light source 2, the main control module 11 makes the input of the communication module 13 in a normal input state, and waits for the visual light source 2 to send over. Signal;

S3: Judging the type of the signal sent by the visual light source 2, the main control module 11 controls the output of the driving module 12 according to the received signal, and controls the operation of the LED module 22, thereby effectively controlling the process of detecting light source parameters.

Preferably, in S3, if the main control module 11 can normally receive the signal command, the main control module 11 parses the received signal command, and controls the driving module 12 according to the parsed information, and the driving module 12 controls the LED module 22 After the visual light source control module 21 of the visual light source 2 correctly receives the signal sent by the communication module 13 , it can send the voltage, current and duty cycle parameters of the visual light source 2 to the main control module 11 .

Preferably, in S3, if the main control module 11 does not receive a return signal from the visual light source 2 within a preset time, the control driver module 12 is controlled to turn off the output, and the LED module 22 does not operate.

Obviously, the existing circuit can no longer meet the requirement of marking the rated voltage and current of the light source parameters, and can not mark parameters such as instantaneous excess voltage, current and duty cycle, and the visual light source control module 21 of the present invention can store and output the visual light source 2 The voltage parameters, current parameters, duty cycle parameters of the visual light source 2 effectively detect the parameters such as excess voltage, current and duty cycle of the visual light source 2, and the operation stability of the main control module 11, the communication module 13 and the visual light source control module 21 is It has good performance and fast response speed, thereby significantly improving the detection accuracy of visual light source parameters and improving the control ability of light source parameter detection.

Based on the disclosure and teaching of the above specification, those skilled in the art to which the present invention pertains can also make changes and modifications to the above-described embodiments. Therefore, the present invention is not limited to the above-mentioned specific embodiments, and any obvious improvement, replacement or modification made by those skilled in the art on the basis of the present invention falls within the protection scope of the present invention. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present invention.

Claims

A control circuit for detecting parameters of a light source, characterized by comprising a light source controller (1) and a light source (2), wherein the light source controller (1) is provided with a main control module (11), a driving module (12) and a communication A module (13), the light source (2) is provided with a light source control module (21) and an LED module (22), the driving module (12) is respectively connected with the main control module (11) and the LED module (22) ) connection, the communication module (13) is respectively connected with the main control module (11) and the light source control module (21), the light source control module (21) is used for storing and outputting the light source (2) voltage parameters, current parameters, and duty cycle parameters.
The control circuit for detecting light source parameters according to claim 1, characterized in that: the main control module (11) is provided with a first control unit, and the first control unit is connected to the communication module (13).
The control circuit for detecting light source parameters according to claim 1, characterized in that: the light source control module (21) is provided with a voltage adjustment unit and a second control unit.
The control circuit for detecting light source parameters according to claim 3, characterized in that: the voltage adjustment unit is connected to the power supply end of the light source controller (1), and the second control unit is connected to the communication module (13). )connect.
The control circuit for detecting light source parameters according to claim 4, characterized in that: the light source control module (21) is provided with a signal processing unit, and the signal processing unit is respectively connected with the communication module (13) and the first Two control units are connected.
The control circuit for detecting light source parameters according to claim 2, wherein the driving module (12) is provided with an operational amplifier unit and a power regulation unit, and the operational amplifier unit is connected to the power regulation unit.
The control circuit for detecting light source parameters according to claim 6, characterized in that: the operational amplifier unit is connected to the first control unit, and the power regulation unit is connected to the LED module (22).
A control method for detecting light source parameters, characterized in that it includes the following steps:

S1: The main control module (11) makes the drive module (12) turn off the output, and the input and output of the communication module (13) are in a high-impedance state;

S2: Make the output of the communication module (13) a normal output state, and make the communication module (13) send a signal to the light source (2), so that the input of the communication module (13) is in a normal input state, and wait The signal sent by the light source (2);

S3: Determine the type of the signal sent by the light source (2), and the main control module (11) controls the output of the driving module (12) according to the received signal, and controls the operation of the LED module (22).
The control method for detecting light source parameters according to claim 8, characterized in that: in said S3, if the main control module (11) can normally receive the signal instruction, the main control module (11) will receive the signal according to the The received signal instructions are parsed, and the driving module (12) is controlled according to the parsed information, and the driving module (12) controls the operation of the LED module (22).
The control method for detecting light source parameters according to claim 8, characterized in that: in said S3, if the main control module (11) does not receive a return signal from the light source (2) within a preset time , the driving module (12) is controlled to turn off the output.