Circuit for switching between long distance and short distance of laser transmitting tube
By using a constant voltage source and a damping resistor to switch in the laser emitter ranging circuit, the problem of unstable power supply to the laser tube was solved, achieving stability and accuracy in both near and far distance ranging, simplifying circuit design and reducing costs.
Patent Information
- Application Number
- CN202422645808.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-10-17
- Estimated Expiration
- 2034-10-31
AI Technical Summary
In existing technologies, the switching frequency of the laser tube cannot keep up with the speed of the constant current chip, resulting in unstable power supply, affecting ranging accuracy and signal quality, and may also cause current and voltage fluctuations, leading to inaccurate ranging results.
The method of switching between near and far distances is achieved by changing the damping resistor value using a constant voltage source. The same constant voltage source is used, and the laser emitter is turned on and off by a control circuit and a high-frequency switching circuit to achieve the switching between near and far distances.
Stable power supply for laser emitter during ranging at both near and far distances was achieved, reducing test errors, avoiding damage to the circuit from sudden current changes, simplifying circuit design, reducing costs, and maintaining system stability.
Smart Images
Figure CN223450157U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a kind of circuit of laser emission tube far distance ranging switching. BACKGROUND
[0002] Because the switching frequency of D1 laser tube reaches 10M in ranging process, the speed of general constant-current chip cannot keep up, leading to unstable power supply of laser tube, and further affecting ranging accuracy and signal quality, and the distance measured is seriously deviated and unstable. Instantaneous current and voltage fluctuation may occur in the switching process of laser tube, which may cause signal distortion, making the ranging result inaccurate. SUMMARY
[0003] The utility model discloses a kind of circuit of laser emission tube far distance ranging switching, use constant voltage source mode to switch damping resistance value to carry out far distance and near distance switching, there is no current following problem, and far distance and near distance use same constant voltage source, and the test error gap between the two is small.
[0004] Technical scheme: to achieve the above object, a kind of circuit of laser emission tube far distance ranging switching of the utility model, including DCDC conversion circuit, impedance switching circuit, control circuit, D1 laser emission tube and high-frequency switch circuit;The input end of DCDC conversion circuit is electrically connected power supply by first filter circuit, and the output end of DCDC conversion circuit is electrically connected the input end of impedance switching circuit by second filter circuit;The output end of impedance switching circuit is electrically connected the positive terminal of D1 laser emission tube, and the negative terminal of D1 laser emission tube is electrically connected the output end of high-frequency switch circuit, and high-frequency switch circuit controls the opening and closing of D1 laser emission tube;The control circuit controls the switching of the impedance size in impedance switching circuit, to realize the switching of D1 laser emission tube far distance and near distance ranging.
[0005] Further, the DCDC conversion circuit includes IC1 integrated circuit and C1 capacitor;The FB end of IC1 integrated circuit is electrically connected one end of C1 capacitor and one end of R2 resistance, and the FB end of IC1 integrated circuit is grounded by R1 resistance;The other end of C1 capacitor is grounded, and the other end of R2 resistance is electrically connected the SW end of IC1 integrated circuit by L1 inductance, and the other end of R2 resistance is electrically connected the OUT end of IC1 integrated circuit;The VIN end of IC1 integrated circuit is electrically connected the EN end of IC1 integrated circuit by R3 resistance.
[0006] Further, the first filter circuit includes C2 capacitor and C3 capacitor;The VIN end of IC1 integrated circuit is electrically connected power supply, one end of C2 capacitor and one end of C3 capacitor, and the other end of C2 capacitor is grounded, and the other end of C3 capacitor is grounded.
[0007] Further, the impedance switching circuit comprises an IC2 integrated circuit, an R4 resistor and an R5 resistor; one end of the R5 resistor is electrically connected to the OUT end of the IC2 integrated circuit, the other end of the R5 resistor is electrically connected to the IN end of the IC2 integrated circuit through the R4 resistor, and the other end of the R5 resistor is electrically connected to the anode of the D1 laser emitting tube; and the EN end of the IC2 integrated circuit is electrically connected to the output end of the control circuit.
[0008] Further, the second filter circuit comprises a C6 capacitor and a C7 capacitor; the IN end of the IC2 integrated circuit is electrically connected to the OUT end of the IC1 integrated circuit, one end of the C6 capacitor and one end of the C7 capacitor; and the other end of the C6 capacitor is grounded, and the other end of the C7 capacitor is grounded.
[0009] Further, the control circuit comprises an IC3 integrated circuit, a C4 capacitor and a C5 capacitor; the VCC end of the IC3 integrated circuit is electrically connected to a power supply, one end of the C4 capacitor and one end of the C5 capacitor, and the other end of the C4 capacitor is grounded, and the other end of the C5 capacitor is grounded; the IO1 end of the IC3 integrated circuit is electrically connected to the EN end of the IC2 integrated circuit; the IO1 end of the IC3 integrated circuit outputs a signal to control the IC2 integrated circuit to be turned on and turned off.
[0010] Further, the high-frequency switching circuit comprises a Q1 integrated circuit; the four D ends of the Q1 integrated circuit are electrically connected to the negative end of the D1 laser emitting tube, the S end of the Q1 integrated circuit is grounded, and the G end of the Q1 integrated circuit receives an LEDPP signal through an R6 resistor to control the D1 laser emitting tube to be turned on and turned off.
[0011] Beneficial effects: the circuit for switching the far and near distance ranging of the laser emitting tube adopts a constant voltage source mode to switch the far and near distance by switching damping resistance values, has no current following problem, and uses the same constant voltage source for the far and near distance, and the test error gap between the two is small; when the far and near distance is switched, the current mutation does not need to be worried about causing damage to the circuit and equipment. The same constant voltage source provides power for the far and near distance, simplifies the circuit design, reduces the number of power supplies and related circuit elements, and reduces the cost. In the case of load change, the output voltage can also be kept constant, thereby ensuring the normal operation of the system and improving the stability of the system. BRIEF DESCRIPTION OF DRAWINGS
[0012] Figure 1 It is a circuit diagram for switching the far and near distance ranging of a laser emitting tube. DETAILED DESCRIPTION
[0013] The utility model will be further explained in connection with the drawings.
[0014] As Figure 1As shown, a kind of laser emission tube far distance ranging switch circuit, including DCDC conversion circuit 1, impedance switching circuit 2, control circuit 3, D1 laser emission tube 4 and high-frequency switching circuit 5;The input end of DCDC conversion circuit 1 is electrically connected power supply by first filter circuit 6, the output end of DCDC conversion circuit 1 is electrically connected the input end of impedance switching circuit by second filter circuit 7;The output end of impedance switching circuit 2 is electrically connected the positive end of D1 laser emission tube 4, the negative end of D1 laser emission tube 4 is electrically connected the output end of high-frequency switching circuit 5, and high-frequency switching circuit 5 controls the opening and closing of D1 laser emission tube 4;The control circuit 3 controls the switching of the impedance size in impedance switching circuit 2, changes the current size through D1 laser emission tube 7, to realize the switching of D1 laser emission tube 4 far distance and near distance ranging.
[0015] The DCDC conversion circuit 1 includes IC1 integrated circuit 11 and C1 capacitor;The FB end of IC1 integrated circuit 11 is electrically connected to one end of C1 capacitor and one end of R2 resistor, and the FB end of IC1 integrated circuit 11 is grounded through R1 resistor;The other end of C1 capacitor is grounded, and the other end of R2 resistor is electrically connected to the SW end of IC1 integrated circuit 11 through L1 inductor, and the other end of R2 resistor is electrically connected to the OUT end of IC1 integrated circuit 11;The VIN end of IC1 integrated circuit 11 is electrically connected to the EN end of IC1 integrated circuit 11 through R3 resistor;The GND end of IC1 integrated circuit 11 is grounded.
[0016] The first filter circuit 6 includes C2 capacitor and C3 capacitor;The VIN end of IC1 integrated circuit 11 is electrically connected to power supply, one end of C2 capacitor and one end of C3 capacitor, and the other end of C2 capacitor is grounded, and the other end of C3 capacitor is grounded.The power supply is 5V power supply for circuit power supply, and C2 capacitor and C3 capacitor of first filter circuit 6 filter the input voltage, and DCDC conversion circuit 1 converts 5V voltage into a suitable voltage value, for example 4.2V, to provide a stable and continuous voltage for the subsequent circuit by adjusting the resistance value of R1 resistor and R2 resistor.
[0017] The impedance switching circuit 2 includes IC2 integrated circuit 21, R4 resistor and R5 resistor;The OUT end of IC2 integrated circuit 21 is electrically connected to one end of R5 resistor, the other end of R5 resistor is electrically connected to the IN end of IC2 integrated circuit 21 through R4 resistor, and the other end of R5 resistor is electrically connected to the positive electrode of D1 laser emission tube 4;The EN end of IC2 integrated circuit 21 is electrically connected to the output end of control circuit 3.
[0018] The second filter circuit 7 comprises a C6 capacitor and a C7 capacitor; the IN end of the IC2 integrated circuit 21 is electrically connected to the OUT end of the IC1 integrated circuit 21, one end of the C6 capacitor and one end of the C7 capacitor; the other end of the C6 capacitor is grounded, and the other end of the C7 capacitor is grounded. The second filter circuit 7 filters the voltage output by the DCDC conversion circuit 1; the IC2 integrated circuit 21 is a switching IC integrated circuit, the R4 resistor and the R5 resistor are damping circuits, the resistance value of the R4 resistor is 10Ω, and the resistance value of the R5 resistor is 1Ω. When the IC2 integrated circuit 21 is closed, the R5 resistor is disconnected, and the current only flows through the R4 resistor, thereby supplying power to the D1 laser emitting tube; when the IC2 integrated circuit 21 is opened, the R5 resistor is connected in parallel with the R4 resistor, and the current flows through the R5 resistor and the R4 resistor, thereby supplying power to the D1 laser emitting tube.
[0019] The control circuit 3 comprises an IC3 integrated circuit 31, a C4 capacitor and a C5 capacitor; the VCC end of the IC3 integrated circuit 31 is electrically connected to a power supply, one end of the C4 capacitor and one end of the C5 capacitor, and the other end of the C4 capacitor is grounded, and the other end of the C5 capacitor is grounded; the IO1 end of the IC3 integrated circuit 31 is electrically connected to the EN end of the IC2 integrated circuit 31; the IO1 end of the IC3 integrated circuit 31 outputs a signal to control the opening and closing of the IC2 integrated circuit 21. The pin of the IC3 integrated circuit 31 is connected to a distance measuring master chip; when the distance measuring master chip detects that a detected object is too close, a signal is sent to the IC3 integrated circuit 31 in the control circuit 3, and the IC3 integrated circuit 31 sends an enable signal to close the IC2 integrated circuit 21; when the distance measuring master chip detects that a detected object is too far away, a signal is sent to the IC3 integrated circuit 31 in the control circuit 3, and the IC3 integrated circuit 31 sends an enable signal to open the IC2 integrated circuit 21.
[0020] The high-frequency switching circuit 5 comprises a Q1 integrated circuit 51; the four D ends of the Q1 integrated circuit 51 are electrically connected to the negative end of the D1 laser emitting tube 4, the S end of the Q1 integrated circuit 51 is grounded, and the G end of the Q1 integrated circuit 51 receives an LEDPP signal through the R6 resistor, thereby realizing the opening and closing of the D1 laser emitting tube 4. The LEDPP signal is input into the high-frequency switching circuit 5 by the distance measuring master chip during distance measurement, and the frequency is about 10MHz, so that the switching frequency of the D1 laser emitting tube 4 reaches 10M.
[0021] The IC1 integrated circuit 11 is a voltage converter MP1605, the IC2 integrated circuit 21 is a high-speed load electronic switch GLF1111, the IC3 integrated circuit 31 is a microcontroller unit STM32G031, and the Q1 integrated circuit 51 is a high-speed low-internal-resistance field effect tube CSD17313.
[0022] Embodiment
[0023] When the ranging chip identifies that the measured object is too close, the ranging main chip informs the control circuit 3 to close the IC2 integrated circuit 21, at this time only the R4 resistor supplies power to the D1 laser emitting tube 4, the R4 resistance is 10Ω, the D1 voltage drop is 4V; the current flowing through the D1 is about (4.2V-4V) / 10Ω=20mA, at this time the D1 brightness is very low, which can be accurately tested within 20cm distance.
[0024] When the ranging chip identifies that the measured object is too far, the ranging main chip informs the control circuit 3 to open the IC2 integrated circuit 21, at this time the R4 and R5 are in parallel, and at the same time supply power to the D1 laser emitting tube 4, the R4 resistance is 10Ω, the R5 resistance is 1Ω, after parallel connection, the resistance is about 0.9Ω, when the D1 laser emitting tube 4 voltage drop is 4V, the current flowing through the D1 is about (4.2V-4V) / 0.9Ω=220mA, at this time the D1 brightness is improved, which can be tested to a farther distance.
[0025] At the same time, by properly adjusting the voltage output by the DCDC conversion circuit, and the resistance of the R4 resistor and the R5 resistor, a desired distance can be obtained, such as within 20cm for short distance, and above 30M for long distance; the requirement of measuring short distance and long distance can be met by adjusting the voltage output by the DCDC conversion circuit, and the resistance of the R4 resistor and the R5 resistor.
[0026] The above is only the description of the preferred embodiment of the present application, and the ordinary skilled in the art can make some modifications and optimizations according to the above disclosure without departing from the above basic principle, and these improvements and optimizations should be regarded as the protection scope of the present application.
Claims
1. A circuit for switching between long-range and short-range distance measurement of a laser transmitting tube, characterized in that: The invention comprises a DCDC conversion circuit (1), an impedance switching circuit (2), a control circuit (3), a D1 laser emitting tube (4) and a high-frequency switching circuit (5); the input end of the DCDC conversion circuit (1) is electrically connected to a power supply via a first filter circuit (6), and the output end of the DCDC conversion circuit (1) is electrically connected to the input end of the impedance switching circuit via a second filter circuit (7); the output end of the impedance switching circuit (2) is electrically connected to the positive end of the D1 laser emitting tube (4), and the negative end of the D1 laser emitting tube (4) is electrically connected to the output end of the high-frequency switching circuit (5); the high-frequency switching circuit (5) controls the opening and closing of the D1 laser emitting tube (4); and the control circuit (3) controls the switching of the impedance size in the impedance switching circuit (2) to realize the switching of the long-distance and short-distance ranging of the D1 laser emitting tube (4).
2. The circuit for switching between long-range and short-range distance measurement of a laser emitting tube according to claim 1, characterized in that: The DCDC conversion circuit (1) comprises an IC1 integrated circuit (11) and a C1 capacitor; an FB terminal of the IC1 integrated circuit (11) is electrically connected to one end of the C1 capacitor and one end of the R2 resistor, and the FB terminal of the IC1 integrated circuit (11) is grounded via the R1 resistor; the other end of the C1 capacitor is grounded, the other end of the R2 resistor is electrically connected to the SW terminal of the IC1 integrated circuit (11) via the L1 inductor, and the other end of the R2 resistor is electrically connected to the OUT terminal of the IC1 integrated circuit (11); the VIN terminal of the IC1 integrated circuit (11) is electrically connected to the EN terminal of the IC1 integrated circuit (11) via the R3 resistor.
3. The circuit for switching between long-range and short-range distance measurement of a laser emitting tube according to claim 2, characterized in that: The first filter circuit (6) includes a C2 capacitor and a C3 capacitor; the VIN terminal of the IC1 integrated circuit (11) is electrically connected to a power supply, one end of the C2 capacitor and one end of the C3 capacitor, and the other end of the C2 capacitor is grounded, and the other end of the C3 capacitor is grounded.
4. The circuit for switching between long-range and short-range distance measurement of a laser emitting tube according to claim 1, characterized in that: The impedance switching circuit (2) comprises an IC2 integrated circuit (21), an R4 resistor, and an R5 resistor; the OUT terminal of the IC2 integrated circuit (21) is electrically connected to one end of the R5 resistor, the other end of the R5 resistor is electrically connected to the IN terminal of the IC2 integrated circuit (21) through the R4 resistor, and the other end of the R5 resistor is electrically connected to the positive electrode of the D1 laser emitting tube (4); the EN terminal of the IC2 integrated circuit (21) is electrically connected to the output terminal of the control circuit (3).
5. The circuit for switching between long-range and short-range distance measurement of a laser emitting tube according to claim 4, characterized in that: The second filter circuit (7) includes a C6 capacitor and a C7 capacitor; the IN terminal of the IC2 integrated circuit (21) is electrically connected to the OUT terminal of the IC1 integrated circuit (21), one end of the C6 capacitor, and one end of the C7 capacitor; and the other end of the C6 capacitor is grounded, and the other end of the C7 capacitor is grounded.
6. The circuit for switching between long-range and short-range distance measurement of a laser emitting tube according to claim 1, characterized in that: The control circuit (3) comprises an IC3 integrated circuit (31), a C4 capacitor and a C5 capacitor; a VCC terminal of the IC3 integrated circuit (31) is electrically connected to a power supply, one end of the C4 capacitor and one end of the C5 capacitor, and the other end of the C4 capacitor is grounded, and the other end of the C5 capacitor is grounded; an IO1 terminal of the IC3 integrated circuit (31) is electrically connected to an EN terminal of the IC2 integrated circuit (31); and the IO1 terminal of the IC3 integrated circuit (31) outputs a signal to control the IC2 integrated circuit (21) to be turned on and off.
7. The circuit for switching between long-range and short-range distance measurement of a laser emitting tube according to claim 1, characterized in that: The high-frequency switch circuit (5) comprises a Q1 integrated circuit (51); the four D terminals of the Q1 integrated circuit (51) are electrically connected to the negative terminal of the D1 laser emitting tube (4); the S terminal of the Q1 integrated circuit (51) is grounded; and the G terminal of the Q1 integrated circuit (51) receives an LEDPP signal via an R6 resistor to control the opening and closing of the D1 laser emitting tube (4).