Search

CN-121983841-A - Protection circuit for limiting laser pulse light emitting time and application method thereof

CN121983841ACN 121983841 ACN121983841 ACN 121983841ACN-121983841-A

Abstract

The invention provides a protection circuit for limiting pulse light emitting time of a laser and an application method thereof, comprising a light emitting signal unit, an enabling signal unit, a first circuit control module, a second circuit control module, a switch unit, an output end of the second circuit control module connected with the switch unit, wherein the first circuit control module outputs fixed time pulse signals d1 with different levels to the second circuit control module according to the light emitting signals output by the light emitting signal unit, the fixed time pulse signals d1 are pulse signals with fixed pulse width N, and the fixed time pulse signals d1 pass through the second circuit control module and output final signals d2 to the switch unit. The invention can process the pulse light-emitting signals, can greatly reduce the probability of out-of-control pulse light-emitting time, has fewer paths of CPU output light-emitting signals and reduces the occupation of CPU resources.

Inventors

  • LI HAI
  • CHEN GUONING
  • LU GUOJIE

Assignees

  • 深圳市联赢激光股份有限公司

Dates

Publication Date
20260505
Application Date
20260228

Claims (10)

  1. 1. A protection circuit for limiting the pulse out time of a laser, comprising: An optical signal output unit; an enable signal unit; one end of the light emitting signal unit and one end of the enabling signal unit are respectively connected with the first circuit control module; The second circuit control module is connected with one input end of the second circuit control module and the other end of the light emitting signal unit, and the other end of the second circuit control module is connected with the other input end of the first circuit control module; the output end of the second circuit control module is connected with the switch unit; the first circuit control module outputs fixed time pulse signals d1 with different levels to the second circuit control module according to the light-emitting signals output by the light-emitting signal unit, the fixed time pulse signals d1 are pulse signals with fixed pulse width N, the fixed time pulse signals d1 pass through the second circuit control module and output final signals d2 to the switch unit, when the switch unit receives the final signals d2 as high-level signals, the switch unit emits light normally, when the switch unit receives the final signals d2 as low-level signals, the switch unit does not emit light.
  2. 2. The protection circuit for limiting the pulse out time of a laser according to claim 1, wherein, The first circuit control module is an AND gate chip ic1; the second circuit control module is an AND gate chip ic2.
  3. 3. The protection circuit for limiting the pulse out time of a laser according to claim 2, wherein, The light-emitting signal unit is a first output end of the CPU, and the light-emitting signal output by the light-emitting signal unit is used for controlling laser pulse light emission; The enabling signal unit is a second output end of the CPU, and the light-emitting enabling signal output by the light-emitting signal unit controls the enabling of the laser pulse; the switch unit is used for controlling the laser pulse to emit light.
  4. 4. The protection circuit for limiting the pulse out time of a laser according to claim 2, wherein, The AND gate chip ic1 is a monostable multivibrator.
  5. 5. The protection circuit for limiting the pulse out time of a laser according to claim 2, wherein, The maximum output pulse width of the fixed time pulse signal d1 is T1; the pins of the AND gate chip ic1 are connected with a patch capacitor C1 and a patch resistor R1; the calculation formula for confirming the maximum output pulse width T1 is t1=0.45×r1×c1.
  6. 6. The protection circuit of claim 4, wherein the protection circuit further comprises a protection circuit for limiting the pulse out time of the laser, The 1 pin of the AND gate chip IC1 is grounded; The pin 2 of the AND gate chip IC1 is connected with the light emitting signal unit, and the pin 2 of the AND gate chip IC1 is connected with the pin 5 of the AND gate chip IC 2; the 3 pin of the AND gate chip IC1 is connected with an enabling signal unit; the 8 pin of the AND gate chip IC1 is grounded; The 13 pin of the AND gate chip IC1 is connected to the 4 pin of the AND gate chip IC2 in series; The 14 pins of the AND gate chip IC1 are connected with the patch capacitor C1 to 15 pins in series, the 14 pins of the AND gate chip IC1 are connected with the patch capacitor C1 to the patch resistor R1 in series, and the patch resistor R1 is connected with a +5V power supply; The 15 pins of the AND gate chip IC1 are connected with the patch resistor R1 to +5V power supply in series, and the 15 pins of the AND gate chip IC1 are connected with the patch capacitor C1 to 14 pins in series; the 16 pins of the AND gate chip IC1 are connected with a +5V power supply, and the 16 pins are connected with the filter patch capacitor C2 in series to the signal ground.
  7. 7. The protection circuit of claim 6, wherein the protection circuit further comprises a protection circuit for limiting the pulse out time of the laser, The pin 4 of the AND gate chip IC2 is connected with the pin 13 of the AND gate chip IC 1; The 5 pins of the AND gate chip IC2 are connected with the light-emitting signal unit, and the 5 pins are connected with the 2 pins of the AND gate chip IC 1; The 6 pin of the AND gate chip IC2 is connected to the switch unit in series through a current limiting resistor R2; The 7 pin of the AND gate chip IC2 is grounded; And the 14 pin of the AND gate chip IC2 is connected with a +5V power supply for supplying power, and the 14 pin is connected with the filter capacitor C3 in series to the signal ground.
  8. 8. The protection circuit for limiting the pulse out time of a laser according to claim 2, wherein, The model of the AND gate chip IC1 is HCT423; The model of the AND gate chip IC2 is HC08S.
  9. 9. A method for applying a protection circuit for limiting the pulse light-emitting time of a laser, which is characterized by comprising the following steps: When the CPU works normally, the first end of the CPU outputs an optical output signal with the pulse time of N, the optical output signal is changed from low level to high level to low level, and when the high level time is N, the 13 pin of the AND gate chip IC1 fixedly outputs a pulse signal with the pulse time of T1; When the CPU works abnormally, the first end of the CPU outputs a low-high abnormal light-emitting signal, the 13 pin of the AND gate chip IC1 outputs a pulse signal which is more than or equal to T1 fixedly, the abnormal light-emitting signal output by the first end of the CPU and the 13 pin of the AND gate chip IC1 pass through the AND gate chip IC2 phase and output a pulse signal with the low level-high level-low level being T1 to the switch unit, and the switch unit does not emit light.
  10. 10. The method of claim 9, wherein the step of applying the protection circuit to limit the pulse-out time of the laser is performed, The value of N is selected to be 30us; the value of T1 is selected to be 45us.

Description

Protection circuit for limiting laser pulse light emitting time and application method thereof Technical Field The invention relates to the technical field of laser protection circuits, in particular to a protection circuit for limiting the pulse light emitting time of a laser and an application method thereof. Background For a pulsed laser, the pulse light emitting time affects both the pulse energy and the laser safety, and if the pulse light emitting signal is out of control, the laser is in a dangerous state, so that it is very important to limit the light emitting time of each pulse. As shown in fig. 3, a current common pulse laser light output control circuit outputs two paths of light output signals simultaneously through software and controls laser pulse light output through an and gate. The common pulse laser light output control circuit has the following defects: 1. As shown in the waveform diagram of fig. 4, when two paths of light-emitting signals are always output high, las_on/OFF will also always output high, so that the laser always emits light, and the light-emitting time is out of control with large probability. 2. The CPU outputs two paths of light-emitting signals with the same frequency and pulse width, so that resources of the CPU are occupied, and response of the CPU to other signals is not facilitated. Disclosure of Invention Aiming at the defects of the prior art, the invention aims to provide a protection circuit for limiting the pulse light-emitting time of a laser and an application method thereof, wherein the protection circuit is provided with a light-emitting signal unit, an enabling signal unit, a first circuit control module and a second circuit control module, can process pulse light-emitting signals, can greatly reduce the probability of out-of-control pulse light-emitting time, has fewer paths for outputting the light-emitting signals and reduces CPU resources. The embodiment of the invention is realized by the following technical scheme: A protection circuit for limiting the pulse out time of a laser, comprising: An optical signal output unit; an enable signal unit; one end of the light emitting signal unit and one end of the enabling signal unit are respectively connected with the first circuit control module; The second circuit control module is connected with one input end of the second circuit control module and the other end of the light emitting signal unit, and the other end of the second circuit control module is connected with the other input end of the first circuit control module; the output end of the second circuit control module is connected with the switch unit; the first circuit control module outputs fixed time pulse signals d1 with different levels to the second circuit control module according to the light-emitting signals output by the light-emitting signal unit, the fixed time pulse signals d1 are pulse signals with fixed pulse width N, the fixed time pulse signals d1 pass through the second circuit control module and output final signals d2 to the switch unit, when the switch unit receives the final signals d2 as high-level signals, the switch unit emits light normally, when the switch unit receives the final signals d2 as low-level signals, the switch unit does not emit light. According to a preferred embodiment, the first circuit control module is an and gate chip ic1; the second circuit control module is an AND gate chip ic2. According to a preferred embodiment, the light-emitting signal unit is a first output end of the CPU, and the light-emitting signal output by the light-emitting signal unit is used for controlling the laser pulse to emit light; The enabling signal unit is a second output end of the CPU, and the light-emitting enabling signal output by the light-emitting signal unit controls the enabling of the laser pulse; the switch unit is used for controlling the laser pulse to emit light. According to a preferred embodiment, the and gate chip ic1 is a monostable multivibrator. According to a preferred embodiment, the maximum output pulse width of the fixed time pulse signal d1 is T1; the pins of the AND gate chip ic1 are connected with a patch capacitor C1 and a patch resistor R1; the calculation formula for confirming the maximum output pulse width T1 is t1=0.45×r1×c1. According to a preferred embodiment, the 1 pin of the AND gate chip IC1 is grounded; The pin 2 of the AND gate chip IC1 is connected with the light emitting signal unit, and the pin 2 of the AND gate chip IC1 is connected with the pin 5 of the AND gate chip IC 2; the 3 pin of the AND gate chip IC1 is connected with an enabling signal unit; the 8 pin of the AND gate chip IC1 is grounded; The 13 pin of the AND gate chip IC1 is connected to the 4 pin of the AND gate chip IC2 in series; The 14 pins of the AND gate chip IC1 are connected with the patch capacitor C1 to 15 pins in series, the 14 pins of the AND gate chip IC1 are connected with the patch capacitor C1 to the patch