CN215338182U - Small-size laser displacement sensor - Google Patents
Small-size laser displacement sensor Download PDFInfo
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- CN215338182U CN215338182U CN202120926183.5U CN202120926183U CN215338182U CN 215338182 U CN215338182 U CN 215338182U CN 202120926183 U CN202120926183 U CN 202120926183U CN 215338182 U CN215338182 U CN 215338182U
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Abstract
The utility model provides a small-sized laser displacement sensor, comprising: the switch control circuit comprises an FPGA and a triode Q2, wherein the base electrode of the triode Q2 is connected with the FPGA; the constant current power supply circuit comprises a resistor R42, a resistor R44, an operational amplifier, a triode Q1 and a load RL, wherein the resistor R42 and the resistor R44 are connected in series, the series connection point is connected with the collector of the triode Q2 and the same-phase end of the operational amplifier, the inverting end of the operational amplifier is connected with the load RL and the emitter of the triode Q1, and the output end of the operational amplifier is connected with the base of the triode Q1 and supplies power to the small laser displacement sensor in a constant current mode. The utility model can realize the constant current power supply of the small laser displacement sensor and control the switch of the laser displacement diode, thereby prolonging the service life.
Description
Technical Field
The utility model belongs to the technical field of laser sensors, and particularly relates to a small laser displacement sensor.
Background
The laser displacement sensor is a product for realizing non-contact distance measurement by using a laser triangulation method. Its basic composition can be divided into 5 parts: the device comprises a light source module, a photoelectric conversion module, an acquisition module, a data processing module and a communication module.
In the prior art, in a laser displacement sensor, a traditional light source module does not realize constant-current power supply, when the power supply of a laser diode floats, the quality of the light source is unstable, and a circuit board is not designed with an isolation power supply due to size limitation, so that the circuit board is easily interfered by other common-ground high-power electric devices in the use process, the working current of the laser diode slightly floats, and the brightness changes. That is, the unstable light source will affect the measurement accuracy and the service life of the sensor.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a small laser displacement sensor, which realizes constant current power supply of the small laser displacement sensor, controls the on and off of a laser displacement diode and prolongs the service life.
The utility model provides the following technical scheme:
the application provides a small-size laser displacement sensor includes:
the switch control circuit comprises an FPGA and a triode Q2, wherein the base electrode of the triode Q2 is connected with the FPGA;
the constant current power supply circuit comprises a resistor R42, a resistor R44, an operational amplifier, a triode Q1 and a load RL, wherein the resistor R42 and the resistor R44 are connected in series, the series connection point is connected with the collector of the triode Q2 and the same-phase end of the operational amplifier, the inverting end of the operational amplifier is connected with the load RL and the emitter of the triode Q1, and the output end of the operational amplifier is connected with the base of the triode Q1 and supplies power to the small laser displacement sensor in a constant current mode.
Preferably, the circuit further comprises a capacitor C51, an inductor L12 and a capacitor C49, wherein the capacitor C51 is connected with the positive electrode pin of the operational amplifier power supply and one end of the inductor L12, the other end of the inductor L12 is connected with one end of a capacitor C49 and the analog power supply, and the other end of the capacitor C49 is connected with the capacitor C51 and grounded.
Preferably, the output end of the operational amplifier is connected with a resistor R43 and a capacitor 52, one end of the resistor 43, which is far away from the operational amplifier, is connected with the base of a transistor Q1, the emitter of the transistor Q1 is further connected with a resistor R45, and the other end of the resistor R45 is connected with the base of a transistor Q1 and a resistor R43.
Preferentially, the constant current power supply circuit further comprises a connector Header 3, a capacitor C54 and a capacitor C55, wherein a collector of the triode Q1 is connected with a third pin of the connector Header 3, a first pin of the connector Header 3 is connected with an analog power supply, the first pin of the connector Header 3 is further connected with one end of the capacitor C55 and one end of the capacitor C54, the other end of the capacitor C55 is connected with the other end of the capacitor C54 and grounded, and an output end of the connector Header 3 is grounded.
Preferably, the load RL includes a resistor R46 and a resistor R47 connected in parallel, and the resistor R46 and the resistor R47 are connected to ground at a end away from the transistor Q1.
Preferably, the emitter of the transistor Q2, the end of the resistor R44 away from the resistor R42, the power supply negative pin of the operational amplifier, and the end of the capacitor C52 away from the resistor R43 are all grounded.
Preferably, the transistor Q1 and the transistor Q2 both use NPN transistors.
The utility model has the beneficial effects that:
1. in the constant current power supply circuit, the triode Q1 and the circuit part of the operational amplifier realize the constant current power supply of the laser displacement sensor, and a stable light source is controlled to improve the measurement precision of the laser displacement sensor;
2. in the switch control circuit, the base voltage of the triode Q2 is controlled by the FPGA, so that the switch of the laser displacement sensor is controlled, the device can be turned off, and the service life of the laser displacement sensor is prolonged.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the principles of the utility model and not to limit the utility model. In the drawings:
fig. 1 is a connection circuit diagram of a compact laser displacement sensor of the present invention.
Labeled as: 1. switch control circuit, 11, FPGA, 2 constant current supply circuit.
Detailed Description
As shown in fig. 1, the present application proposes a compact laser displacement sensor, comprising:
as shown in fig. 1, the switch control circuit 1 includes an FPGA11 and a transistor Q2, and a base of the transistor Q2 is connected to the FPGA 11.
As shown in fig. 1, the base voltage of the triode Q2 is controlled by the FPGA11, when the base of the triode Q2 is at a high level, the emitter of the triode Q2 is forward biased, and the collector is reverse biased, so that a series circuit of a digital power supply 3.3V, a resistor R42, a resistor R44 and GND is formed, and the non-inverting terminal of the operational amplifier obtains a voltage division of 1.65V, thereby turning on the constant current supply circuit 2; when the base of the triode Q2 is at a low level, the collector of the triode Q2 is forward biased, the emitter is forward biased, the triode Q2 is equivalently formed into a section of conducting wire, the in-phase end of the operational amplifier is set to 0V, the anti-phase end is also set to 0V according to the virtual short characteristic of the operational amplifier, the current IL flowing through RL is 0mA, the current of the collector of the triode Q2 is limited to 0mA, and the laser displacement sensor is not conducted any more.
As shown in fig. 1, the constant current power supply circuit 2 includes a resistor R42, a resistor R44, an operational amplifier, a transistor Q1, and a load RL, and both the transistor Q1 and the transistor Q2 employ NPN transistors. The resistor R42 and the resistor R44 are connected in series, the series connection point is connected with the collector of the triode Q2 and the in-phase end of the operational amplifier, the inverting end of the operational amplifier is connected with the load RL and the emitter of the triode Q1, and the output end of the operational amplifier is connected with the base of the triode Q1 and supplies power for the constant current of the small laser displacement sensor. The output end of the operational amplifier is connected with a resistor R43 and a capacitor 52, one end of the resistor 43, which is far away from the operational amplifier, is connected with the base of a triode Q1, the emitter of the triode Q1 is also connected with a resistor R45, and the other end of the resistor R45 is connected with the base of a triode Q1 and a resistor R43. The load RL comprises a resistor R46 and a resistor R47 which are connected in parallel, and one end of the resistor R46 and one end of the resistor R47 which are far away from the triode Q1 are connected and grounded.
As shown in fig. 1, the constant current supply circuit 2 further includes a connector Header 3, a capacitor C54, and a capacitor C55, a collector of the transistor Q1 is connected to a third pin of the connector Header 3, a first pin of the connector Header 3 is connected to an analog power supply, the first pin of the connector Header 3 is further connected to one end of the capacitor C55 and one end of the capacitor C54, the other end of the capacitor C55 is connected to the other end of the capacitor C54 and grounded, and an output end of the connector Header 3 is grounded. The emitter of the transistor Q2, one end of the resistor R44 far away from the resistor R42, the power supply negative pin of the operational amplifier and one end of the capacitor C52 far away from the resistor R43 are all grounded.
As shown in fig. 1, the constant current supply of the laser diode is realized in the transistor Q1 and the circuit part of the operational amplifier, and the current is stabilized at 33 mA. The constant current supply circuit 2 designed by the operational amplifier introduces feedback, and utilizes the 'virtual short' characteristic of the operational amplifier, namely, the same-phase voltage is equal to the opposite-phase voltage, namely, the voltages of the same-phase end and the opposite-phase end of the operational amplifier are approximately equal. When the in-phase terminal voltage is equal to half of 3.3V in the series circuit of the resistor R42 and the resistor R43, i.e., 1.65V, the obtained reverse terminal voltage U4 is 1.65V, and the current IL flowing through the RL is U4/((R46+ R47)/2) is 1.65V/50 Ω and 33 mA. The current passing through the laser diode, i.e. the output current Iout flowing through the connector Header 3, is: and Iout is IB + IL, wherein IB is base current, and if the IB is neglected, the Iout is IL, namely 33mA, and constant current supply is ensured.
As shown in fig. 1, the circuit further includes a capacitor C51, an inductor L12, and a capacitor C49, the capacitor C51 is connected to the positive terminal pin of the operational amplifier power supply and one end of the inductor L12, the other end of the inductor L12 is connected to one end of a capacitor C49 and the analog power supply, and the other end of the capacitor C49 is connected to the capacitor C51 and grounded.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the utility model. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A small-size laser displacement sensor which characterized in that: the method comprises the following steps:
the switch control circuit comprises an FPGA and a triode Q2, wherein the base electrode of the triode Q2 is connected with the FPGA;
the constant current power supply circuit comprises a resistor R42, a resistor R44, an operational amplifier, a triode Q1 and a load RL, wherein the resistor R42 and the resistor R44 are connected in series, the series connection point is connected with the collector of the triode Q2 and the same-phase end of the operational amplifier, the inverting end of the operational amplifier is connected with the load RL and the emitter of the triode Q1, and the output end of the operational amplifier is connected with the base of the triode Q1 and supplies power to the small laser displacement sensor in a constant current mode.
2. The compact laser displacement sensor according to claim 1, wherein: the high-voltage power supply further comprises a capacitor C51, an inductor L12 and a capacitor C49, wherein the capacitor C51 is connected with the positive electrode pin of the operational amplifier power supply and one end of the inductor L12, the other end of the inductor L12 is connected with one end of a capacitor C49 and an analog power supply, and the other end of the capacitor C49 is connected with the capacitor C51 and grounded.
3. The compact laser displacement sensor according to claim 2, wherein: the output end of the operational amplifier is connected with a resistor R43 and a capacitor 52, one end of the resistor 43, which is far away from the operational amplifier, is connected with the base electrode of a triode Q1, the emitter electrode of the triode Q1 is also connected with a resistor R45, and the other end of the resistor R45 is connected with the base electrode of a triode Q1 and a resistor R43.
4. The compact laser displacement sensor according to claim 3, wherein: the constant current power supply circuit further comprises a connector Header 3, a capacitor C54 and a capacitor C55, wherein a collector of the triode Q1 is connected with a third pin of the connector Header 3, a first pin of the connector Header 3 is connected with an analog power supply, the first pin of the connector Header 3 is further connected with one end of the capacitor C55 and one end of the capacitor C54, the other end of the capacitor C55 is connected with the other end of the capacitor C54 and is grounded, and an output end of the connector Header 3 is grounded.
5. The compact laser displacement sensor according to claim 4, wherein: the load RL comprises a resistor R46 and a resistor R47 which are connected in parallel, and one end of the resistor R46 and one end of the resistor R47, which are far away from the triode Q1, are connected and grounded.
6. The compact laser displacement sensor according to claim 4, wherein: the emitter of the triode Q2, one end of the resistor R44 far away from the resistor R42, the power supply negative pin of the operational amplifier and one end of the capacitor C52 far away from the resistor R43 are all grounded.
7. The compact laser displacement sensor according to claim 1, wherein: the transistor Q1 and the transistor Q2 both use NPN transistors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120926183.5U CN215338182U (en) | 2021-04-30 | 2021-04-30 | Small-size laser displacement sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120926183.5U CN215338182U (en) | 2021-04-30 | 2021-04-30 | Small-size laser displacement sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215338182U true CN215338182U (en) | 2021-12-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120926183.5U Active CN215338182U (en) | 2021-04-30 | 2021-04-30 | Small-size laser displacement sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215338182U (en) |
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2021
- 2021-04-30 CN CN202120926183.5U patent/CN215338182U/en active Active
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