Visual control system of photoelectric measuring instrument

Abstract

The utility model discloses a visual control system of a photoelectric measuring instrument, comprising a load identification circuit which comprises a constant current source module, a label resistor whose input end is connected with an external power supply and output end is connected with a load, and a constant current which outputs a preset current value and flows through the label resistor; and an ADC interface of the single-chip microcomputer is connected with the load identification circuit to obtain an analog voltage signal generated by the tag resistor and convert the analog voltage signal into a digital voltage so as to calculate the resistance value of the tag resistor according to the constant current and the digital voltage. Light intensity detection is performed on the environment in a use environment, and the current for supplying power to the lamp wick is dynamically adjusted according to the light intensity, so that the light intensity is changed, and the energy consumption is reduced; the light source loads with different rated currents can be identified and driven by the same visual light source controller, the production management is simplified, and the adaptability of the visual light source controller is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of photoelectric measuring instrument vision control, in particular to a photoelectric measuring instrument vision control system. Background Art

[0002] Photoelectric rangefinder, also known as light speed rangefinder, is an instrument that uses modulated light waves for precise distance measurement. The measurement range can reach about 2.5 kilometers and can also be used for night operations. There are many types of photoelectric rangefinders, among which infrared rangefinders are the most rapidly developing. The principle of photoelectric distance measurement is: when measuring the distance between two points, a rangefinder is placed at one point to be measured and a reflector is placed at the other point. When the rangefinder sends light to the reflector, the light is reflected by the reflector and then returns to the instrument;

[0003] Existing photoelectric rangefinders cannot detect light intensity before measurement, so they all make the light source emit light in the dark, so the light intensity is the strongest. However, if used during the day or measured in the evening, using the strongest light will undoubtedly make the light intensity excessive, thereby increasing energy consumption. Utility Model Content

[0004] In view of the problems existing in an existing vision control system of a photoelectric measuring instrument, the utility model is proposed.

[0005] Therefore, the purpose of the utility model is to provide a photoelectric measuring instrument visual control system, which solves the problem that the existing photoelectric rangefinder cannot detect the light intensity before measurement, so the light source is illuminated according to the night state, so the light intensity is the strongest state. However, if it is used during the day or measured in the evening, the use of the strongest light will undoubtedly make the light intensity excessive, thereby leading to the problem of increased energy consumption.

[0006] In order to solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solutions:

[0007] A visual control system for a photoelectric measuring instrument, comprising: a load identification circuit, which comprises: a constant current source module, whose input end is connected to an external power supply, whose output end is connected to a label resistor of a load, and whose output current outputs a constant current of a preset current value flowing through the label resistor; a single-chip computer, whose ADC interface is connected to the load identification circuit, obtains an analog voltage signal generated by the label resistor, and converts it into a digital voltage, so as to calculate the resistance value of the label resistor according to the constant current and the digital voltage, and obtain the rated current of the load according to the preset corresponding relationship between the resistance value of the label resistor and the rated current; according to the rated current, a corresponding PWM signal is generated; an external reference voltage generating circuit, whose input end is connected to the single-chip computer, so as to obtain the PWM signal, and generate a reference voltage according to the duty cycle of the PWM signal; a constant current driving circuit, whose input end is connected to the output end of the external reference voltage generating circuit, and whose output end is connected to a load, and also comprises a light intensity detector connected to the single-chip computer, and a control circuit for controlling the light intensity of a lamp source;

[0008] The control circuit includes a lamp core, a resistor R100, a resistor R200 and a resistor R300 connected in series, and the resistors R200 and R300 are respectively connected in parallel with the lamp core through wires on which switches are installed.

[0009] As a preferred solution of the vision control system of a photoelectric measuring instrument described in the utility model, wherein: the light intensity detector is used to detect the light intensity of the environment.

[0010] As a preferred solution of a visual control system of a photoelectric measuring instrument described in the utility model, the constant current source module includes: a first sampling resistor, one end of which is connected to an external power supply AVCC to generate a sampling voltage; an operational amplifier, the in-phase input of which is connected to a 0.3V voltage generated by a voltage divider resistor with AVCC as a reference; the inverting input of which is connected to the other end of the first sampling resistor to obtain the sampling voltage; so as to adjust the output voltage according to the voltage difference between the in-phase input and the inverting input; a first PMOS, the source of which is connected to the first sampling resistor, and the gate of which is connected to the output of the operational amplifier, so as to make its drain output current reach the preset current value according to the output voltage; a light source interface, the input of which is connected to the drain of the first PMOS, and the output of which is connected to the label resistor.

[0011] As a preferred solution of a photoelectric measuring instrument visual control system described in the utility model, wherein: the constant current drive circuit includes: a constant current drive chip, whose IADJ pin is connected to the output end of the voltage follower to obtain the reference voltage; a second PMOS, whose source is connected to the first input pin of the constant current drive chip, and whose gate is connected to the first output pin of the constant current drive chip; a current sensing resistor, whose two ends are respectively connected to the first input pin and the second input pin of the built-in differential amplifier of the constant current drive chip, for detecting the current flowing through the second PMOS, so as to control the switch of the second PMOS; a load interface, connected to the drain of the second PMOS, to obtain the output current to power the load.

[0012] As a preferred solution of a photoelectric measuring instrument visual control system described in the utility model, the voltage-dividing resistor includes: a first voltage-dividing resistor, one end of which is connected to an external power supply AVCC; a second voltage-dividing resistor, one end of which is connected to the other end of the first voltage-dividing resistor and the other end is grounded.

[0013] As a preferred solution of a photoelectric measuring instrument visual control system described in the utility model, the constant current source module also includes: an input resistor, one end of which is connected to the inverting input terminal of the operational amplifier, and the other end is connected to the first sampling resistor; a feedback capacitor, the positive electrode of which is connected to the inverting input terminal of the operational amplifier, and the negative electrode of which is connected to the output terminal of the operational amplifier.

[0014] As a preferred solution of the vision control system of a photoelectric measuring instrument described in the utility model, the load identification circuit also includes a transient suppression diode, the drain of which is connected to the input end of the light source interface and the source is grounded.

[0015] As a preferred solution of a photoelectric measuring instrument visual control system described in the utility model, the external reference voltage generating circuit includes: a first inverter, which obtains the PWM signal generated by the single-chip microcomputer, performs level conversion to generate a voltage control signal output; a second-order low-pass filter unit, connected to the output end of the first inverter, and is used to convert the voltage control signal into a DC voltage control signal; a voltage follower, connected to the output end of the second-order low-pass filter unit, and is used to perform impedance transformation according to the DC voltage control signal to generate a reference voltage.

[0016] Compared with existing technologies:

[0017] 1. By setting up a light intensity detector, the light intensity of the environment is detected in the use environment, and the current supplied to the wick is dynamically adjusted according to the light intensity, thereby changing the light intensity and reducing energy consumption;

[0018] 2. Calculate the resistance value of the label resistor according to the constant current and the digital voltage, and obtain the rated current of the load according to the correspondence between the preset resistance value of the label resistor and the rated current of the load; the single-chip microcomputer outputs a PWM signal to the external reference voltage generation circuit according to the rated current, and generates a reference voltage through low-pass filtering, and changes the duty cycle of PWM to change the reference voltage; and add the reference voltage to the constant current drive chip of the constant current drive circuit, and adjust the output current of the constant current drive circuit to adapt to light source loads with different rated currents. The load rated current is obtained through the load identification circuit, and the same visual light source controller can identify and drive light source loads with different rated currents, which simplifies production management and improves the adaptability of the visual light source controller. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the composition provided by the utility model;

[0020] Figure 2 The schematic diagram of the light intensity control circuit provided by the utility model;

[0021] Figure 3 The load identification circuit schematic diagram provided by the utility model;

[0022] Figure 4 The schematic diagram of the external reference voltage generating circuit provided by the utility model;

[0023] Figure 5 This is a schematic diagram of a constant current drive circuit provided by the utility model. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clear, the implementation methods of the present invention will be further described in detail below with reference to the accompanying drawings.

[0025] The utility model provides a photoelectric measuring instrument visual control system, please refer to Figure 1-5, including: a load identification circuit, which includes: a constant current source module, the input end of which is connected to an external power supply, the output end of which is connected to the label resistor of the load, and the constant current of a preset current value is output to flow through the label resistor; a single-chip microcomputer, whose ADC interface is connected to the load identification circuit, obtains the analog voltage signal generated by the label resistor, and converts it into a digital voltage, so as to calculate the resistance value of the label resistor according to the constant current and the digital voltage, and obtain the rated current of the load according to the corresponding relationship between the resistance value of the label resistor and the rated current set in advance; according to the rated current, a corresponding PWM signal is generated; an external reference voltage generating circuit, the input end of which is connected to the single-chip microcomputer, so as to obtain the PWM signal, and generate a reference voltage according to the duty cycle of the PWM signal; a constant current driving circuit, the input end of which is connected to the output end of the external reference voltage generating circuit, the output end of which is connected to the load, and also includes a light intensity detector connected to the single-chip microcomputer, the light intensity detector is used to detect the light intensity of the environment, and a control circuit for controlling the light intensity of the light source;

[0026] The control circuit includes a wick, a resistor R100, a resistor R200 and a resistor R300 connected in series, and the resistors R200 and R300 are respectively connected in parallel with the wick through wires with switches installed thereon; the light intensity detector detects the light intensity of the use environment, and when the light is strong, K100 and K200 are both in the on state, so that the resistance in the circuit becomes larger, thereby making the circuit smaller, that is, the light is weaker; when the light intensity of the use environment is weak, K100 is turned off, so that the current in the circuit becomes larger; when the light intensity of the use environment is very weak, K100 and K200 are turned off, so that the current in the circuit is the largest.

[0027] The constant current source module includes: a first sampling resistor, one end of which is connected to an external power supply AVCC to generate a sampling voltage; an operational amplifier, a non-inverting input end of which is connected to a 0.3V voltage generated by a voltage divider resistor with AVCC as a reference; an inverting input end of which is connected to the other end of the first sampling resistor to obtain the sampling voltage; so as to adjust the output voltage according to the voltage difference between the non-inverting input end and the inverting input end; a first PMOS, a source connected to the first sampling resistor, and a gate connected to the output end of the operational amplifier, so as to make its drain output current reach the preset current value according to the output end voltage; a light source interface, an input end connected to the drain of the first PMOS, and an output end connected to the label resistor.

[0028] The constant current drive circuit includes: a constant current drive chip, whose IADJ pin is connected to the output end of the voltage follower to obtain the reference voltage; a second PMOS, whose source is connected to the first input pin of the constant current drive chip, and whose gate is connected to the first output pin of the constant current drive chip; a current sensing resistor, whose two ends are respectively connected to the first input pin and the second input pin of the built-in differential amplifier of the constant current drive chip, for detecting the current flowing through the second PMOS so as to control the switch of the second PMOS; a load interface, connected to the drain of the second PMOS to obtain the output current to power the load.

[0029] The voltage-dividing resistor comprises: a first voltage-dividing resistor, one end of which is connected to an external power supply AVCC; and a second voltage-dividing resistor, one end of which is connected to the other end of the first voltage-dividing resistor and the other end of which is grounded.

[0030] The constant current source module also includes: an input resistor, one end of which is connected to the inverting input terminal of the operational amplifier, and the other end is connected to the first sampling resistor; a feedback capacitor, a positive electrode of which is connected to the inverting input terminal of the operational amplifier, and a negative electrode of which is connected to the output terminal of the operational amplifier.

[0031] The load identification circuit also includes a transient suppression diode, a drain of which is connected to the input end of the light source interface and a source of which is grounded.

[0032] The external reference voltage generating circuit includes: a first inverter, which obtains the PWM signal generated by the single-chip microcomputer and performs level conversion to generate a voltage control signal output; a second-order low-pass filtering unit, which is connected to the output end of the first inverter and is used to convert the voltage control signal into a DC voltage control signal; a voltage follower, which is connected to the output end of the second-order low-pass filtering unit and is used to perform impedance transformation according to the DC voltage control signal to generate a reference voltage.

[0033] Although the present invention has been described above with reference to the embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed in the present invention may be used in combination with each other in any manner, and the fact that these combinations are not exhaustively described in this specification is only for the sake of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A photoelectric measuring instrument visual control system, comprising: A load identification circuit, comprising: a constant current source module, the input end of which is connected to an external power supply, the output end of which is connected to a label resistor of a load, and the constant current of a preset current value is output to flow through the label resistor; a single-chip computer, the ADC interface of which is connected to the load identification circuit, obtains the analog voltage signal generated by the label resistor, and converts it into a digital voltage, so as to calculate the resistance value of the label resistor according to the constant current and the digital voltage, and obtain the rated current of the load according to the correspondence between the resistance value of the label resistor and the rated current set in advance; and generates a corresponding PWM signal according to the rated current; an external reference voltage generating circuit, the input end of which is connected to the single-chip computer, so as to obtain the PWM signal, and generate a reference voltage according to the duty cycle of the PWM signal; a constant current driving circuit, the input end of which is connected to the output end of the external reference voltage generating circuit, and the output end of which is connected to a load, characterized in that it also includes a light intensity detector connected to the single-chip computer, and a control circuit for controlling the light intensity of a lamp source; The control circuit includes a lamp core, a resistor R100, a resistor R200 and a resistor R300 connected in series, and the resistors R200 and R300 are respectively connected in parallel with the lamp core through wires on which switches are installed.

2. A photoelectric measuring instrument visual control system according to claim 1, characterized in that: The light intensity detector is used to detect the light intensity of the environment.

3. The photoelectric measuring instrument visual control system according to claim 1, characterized in that: The constant current source module includes: a first sampling resistor, one end of which is connected to an external power supply AVCC to generate a sampling voltage; an operational amplifier, a non-inverting input end of which is connected to a 0.3V voltage generated by a voltage divider resistor with AVCC as a reference; an inverting input end of which is connected to the other end of the first sampling resistor to obtain the sampling voltage; so as to adjust the output voltage according to the voltage difference between the non-inverting input end and the inverting input end; a first PMOS, a source connected to the first sampling resistor, and a gate connected to the output end of the operational amplifier, so as to make its drain output current reach the preset current value according to the output end voltage; a light source interface, an input end connected to the drain of the first PMOS, and an output end connected to the label resistor.

4. The photoelectric measuring instrument visual control system according to claim 1, characterized in that: The constant current drive circuit includes: a constant current drive chip, whose IADJ pin is connected to the output end of the voltage follower to obtain the reference voltage; a second PMOS, whose source is connected to the first input pin of the constant current drive chip, and whose gate is connected to the first output pin of the constant current drive chip; a current sensing resistor, whose two ends are respectively connected to the first input pin and the second input pin of the built-in differential amplifier of the constant current drive chip, for detecting the current flowing through the second PMOS so as to control the switch of the second PMOS; a load interface, connected to the drain of the second PMOS to obtain the output current to power the load.

5. The photoelectric measuring instrument visual control system according to claim 3, characterized in that: The voltage-dividing resistor comprises: a first voltage-dividing resistor, one end of which is connected to an external power supply AVCC; and a second voltage-dividing resistor, one end of which is connected to the other end of the first voltage-dividing resistor and the other end of which is grounded.

6. The photoelectric measuring instrument visual control system according to claim 1, characterized in that: The constant current source module also includes: an input resistor, one end of which is connected to the inverting input terminal of the operational amplifier, and the other end is connected to the first sampling resistor; a feedback capacitor, a positive electrode of which is connected to the inverting input terminal of the operational amplifier, and a negative electrode of which is connected to the output terminal of the operational amplifier.

7. The photoelectric measuring instrument visual control system according to claim 1, characterized in that: The load identification circuit also includes a transient suppression diode, a drain of which is connected to the input end of the light source interface and a source of which is grounded.

8. The photoelectric measuring instrument visual control system according to claim 1, characterized in that: The external reference voltage generating circuit includes: a first inverter, which obtains the PWM signal generated by the single-chip microcomputer and performs level conversion to generate a voltage control signal output; a second-order low-pass filtering unit, which is connected to the output end of the first inverter and is used to convert the voltage control signal into a DC voltage control signal; a voltage follower, which is connected to the output end of the second-order low-pass filtering unit and is used to perform impedance transformation according to the DC voltage control signal to generate a reference voltage.

Images