Low-energy-consumption laser control circuit system

Abstract

The utility model provides a laser control circuit system with low energy consumption. The laser control circuit system comprises a first voltage conversion circuit module, a second voltage conversion module, a main control chip U5, a laser control circuit unit and a current and voltage acquisition circuit module, the first voltage conversion circuit module is electrically connected with the second circuit voltage conversion module, the second circuit voltage conversion module is electrically connected with the main control chip, and the laser control circuit unit is electrically connected with the first voltage conversion module, the main control chip U5 and the laser. The current and voltage acquisition circuit module is electrically connected with the laser control circuit unit and the main control chip U5, the response time is short, the response is sensitive, the output current and voltage of the laser can be well controlled and detected, and the phenomena of excessive energy consumption of the laser and the like are prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of lasers, in particular to a laser control circuit system with low energy consumption. Background Art

[0002] The laser control circuit part is powered by a power adapter (12V 60W). The 5V and 3.3V output voltages are obtained through each step-down chip to power the screen and the single-chip microcomputer. A switching power supply chip LM3150 with a maximum current of 12A is adopted, and the 2.7V output voltage is obtained by adjusting its PWM duty cycle to power the laser. In this way, the LD-control module is used to control the output current of the laser. The larger the current, the greater the output power of the laser, and the greater the energy consumption.

[0003] In view of this, it is necessary to provide a new laser control circuit system with low energy consumption to overcome the above defects. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a laser control circuit system with low energy consumption, which has a fast response time, is sensitive, can better control and detect the output current and voltage of the laser, and prevent phenomena such as excessive energy consumption of the laser.

[0005] In order to achieve the above purpose, the technical solution provided by the utility model is realized as follows: A laser control circuit system with low energy consumption includes: a first voltage conversion circuit module, a second circuit voltage conversion module, a main control chip U5, a laser control circuit unit, and a current and voltage acquisition circuit module;

[0006] The first voltage conversion circuit module is electrically connected to the second circuit voltage conversion module, the second circuit voltage conversion module is electrically connected to the main control chip, the laser control circuit unit is electrically connected to the first voltage conversion module, the main control chip U5, and the laser, and the current and voltage acquisition circuit module is electrically connected to the laser control circuit unit and the main control chip U5.

[0007] Preferably, the first voltage conversion circuit module includes a gas discharge tube D1, a polarized capacitor C3, a capacitor C4, a buck conversion element U1, a capacitor C1, a Schottky diode D2, an inductor L1, a polarized capacitor C2, a resistor R1, a resistor R3, and a fuse F1;

[0008] The first end of the gas discharge tube D1 is connected to a 12V power supply and is electrically connected to the positive electrode of the polarized capacitor C3, the first end of the capacitor C4, and the VIN pin of the first buck conversion element U1. The second end of the gas discharge tube D1 is electrically connected to the negative electrode of the polarized capacitor C3, the second end of the capacitor C4, and is grounded.

[0009] The PH pin of the step-down conversion component U1 is electrically connected to the first end of the inductor L1. The BOOT pin of the step-down conversion component U1 is electrically connected to the first end of the capacitor C1. The VSENSE pin of the step-down conversion component U1 is electrically connected to the resistor R3. The second end of the capacitor C1 is electrically connected to the first end of the inductor L1. The second end of the inductor L1 is electrically connected to the positive electrode of the polarized capacitor C2, the first end of the resistor R1, and the first end of the fuse F1. The second end of the resistor R1 is electrically connected to the resistor R3. The resistor R3 is grounded.

[0010] Preferably, the second voltage conversion circuit module includes a resistor R2, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a second step-down conversion module U2, a resistor R4, a capacitor C9, a capacitor C10, an inductor BL1, a capacitor C11, and a fuse F2;

[0011] The first end of the resistor R2 is electrically connected to the fuse F1. The second end of the resistor R2 is electrically connected to the VDD pins of the capacitor C5, the capacitor C6, the capacitor C7, the capacitor C8, and the second step-down conversion module U2. The GND pins of the capacitor C5, the capacitor C6, the capacitor C7, the capacitor C8, and the second step-down conversion module U2 are electrically connected to the resistor R4 and grounded. The VOUT pin of the second step-down conversion module U2 is electrically connected to the capacitor C9, the capacitor C10, and the inductor BL1. The inductor BL1 is electrically connected to the capacitor C11 and the fuse F2. The capacitor C9, the capacitor C10, and the capacitor C11 are electrically connected to the GND pin of the second step-down conversion module U2 and grounded. It should be noted that in this embodiment, the model of the second step-down conversion module U2 is BL8071CLATR33.

[0012] Preferably, the laser control circuit unit includes a first control circuit module. The first control circuit module includes a capacitor C32, a capacitor C33, a capacitor C34, a polarized capacitor C35, a capacitor C36, a capacitor C37, a capacitor C38, a capacitor C39, a resistor R24, a resistor R25, a Schottky diode D10, a resistor R27, a resistor R28, an inductor L2, a capacitor C40, a capacitor C41, a polarized capacitor C42, a polarized capacitor C43, a MOS transistor Q3, a MOS transistor Q4, and a step-down power supply control component U7;

[0013] The capacitor C32 is electrically connected to the VCC pin of the buck power supply control component U7. The positive electrode of the polarized capacitor C35, the first end of the capacitor C36, and the VIN pin of the buck power supply control component U7 are electrically connected to the first end of the gas discharge tube D1 of the first voltage conversion circuit module. The negative electrode of the polarized capacitor C35 and the second end of the capacitor C36 are electrically connected to the capacitor C38 and grounded. The capacitor C38 is electrically connected to the EN pin of the buck power supply control component U7. The capacitor C39 is electrically connected to the SGNG pin and the SS pin of the buck power supply control component U7 and grounded. The resistor R24 is electrically connected to the first end of the gas discharge tube D1 and the RON pin of the buck power supply control component U7.

[0014] The PGND pin of the buck power supply control component U7 is electrically connected to the source electrode of the MOS transistor Q3. The LG pin of the buck power supply control component U7 is electrically connected to the gate electrode of the MOS transistor Q3. The drain electrode of the MOS transistor Q3 is electrically connected to the source electrode of the MOS transistor, the SW pin of the buck power supply control component U7, and the inductor L2. The HG pin of the buck power supply control component U7 is electrically connected to the gate electrode of the MOS transistor Q4. The BST pin of the buck power supply control component U7 is electrically connected to the capacitor C37. The capacitor C37 is electrically connected to the resistor R25, the SW pin of the buck power supply control component U7, and the Schottky diode D10. The resistor R25 is electrically connected to the ILIM pin of the buck power supply control component U7. The inductor L2 is electrically connected to the resistor R28, the capacitor C44, the capacitor C40, the capacitor C41, the positive electrode of the polarized capacitor C42, the positive electrode of the polarized capacitor C43, and the laser. The resistor R28 is electrically connected to the resistor R27, the FB pin of the buck power supply control component U7, and the capacitor C44. The resistor R27 is grounded. The capacitor C40 is electrically connected to the capacitor C41 and grounded. The negative electrode of the polarized capacitor C42 is electrically connected to the negative electrode of the polarized capacitor C43 and grounded.

[0015] Preferably, the laser control circuit unit further includes a second control circuit module. The control circuit module includes a resistor R29, a resistor R30, a resistor R36, a resistor R40, a MOS transistor Q8, a resistor R33, a resistor R38, and a MOS transistor Q7.

[0016] The resistor R29 and the resistor R30 are electrically connected to the fuse F1 of the first voltage conversion circuit module. The resistor R30 is electrically connected to the drain electrode of the MOS transistor Q8 and the first end of the resistor R33. The first end of the resistor R36 is electrically connected to the PE2 pin of the main control chip U5. The second end of the resistor R36 is electrically connected to the gate electrode of the MOS transistor Q8 and the first end of the resistor R40. The source electrode of the MOS transistor Q8 is electrically connected to the second end of the resistor R40 and grounded.

[0017] The second end of the resistor R33 is electrically connected to the gate of the MOS transistor Q7 and the first end of the resistor R38. The resistor R29 is electrically connected to the drain of the MOS transistor Q7 and the EN pin of the buck power supply control component U7. The source of the MOS transistor Q7 is electrically connected to the second end of the resistor R38 and grounded.

[0018] Preferably, the laser control circuit unit further includes a third control circuit module, and the third control circuit module includes a resistor R31, a resistor R32, a resistor R34, a resistor R35, a resistor R37, a resistor R39, a capacitor C47, a capacitor C48, a capacitor C49, a capacitor C50, a capacitor C51, and an operational amplifier module U9;

[0019] The first end of the resistor R32 is grounded. The second end of the resistor R32 is electrically connected to the first end of the resistor R31 and the 1IN- pin of the operational amplifier module U9. The second end of the resistor R31 is electrically connected to the 1OUT pin of the operational amplifier module U9. The 1IN+ pin of the operational amplifier module U9 is electrically connected to the first end of the capacitor C50, the first end of the resistor R37, and the first end of the resistor R34. The second end of the resistor R34 is electrically connected to the PA6 pin of the main control chip U5. The second end of the resistor R37 is electrically connected to the second end of the capacitor C50 and the VDD- / GND pin of the operational amplifier module U9 and grounded.

[0020] The VDD+ pin of the operational amplifier module U9 is electrically connected to the capacitor C47, the capacitor C48, and the fuse F1 of the first voltage conversion circuit module. The capacitor C47 and the capacitor C48 are grounded. The 2OUT pin and the 2IN- pin of the operational amplifier module U9 are electrically connected to the first end of the resistor R35. The second end of the resistor R35 is electrically connected to the PA7 pin of the main control chip U5 and the capacitor C49. The capacitor C49 is grounded. The 2IN+ pin of the operational amplifier module U9 is electrically connected to the first end of the resistor R39 and the first end of the capacitor C51. The second end of the resistor R39 is electrically connected to the second end of the capacitor C51 and grounded.

[0021] Preferably, the laser control circuit unit further includes a fourth control circuit module, and the fourth control circuit module includes a resistor R20, a resistor R21, a resistor R22, a resistor R23, a MOS transistor Q5, and a MOS transistor Q6;

[0022] The first end of the resistor R20 is electrically connected to the 1OUT pin of the operational amplifier module U9. The second end of the resistor R20 is electrically connected to the drain of the MOS transistor Q6 and the gate of the MOS transistor Q5. The first end of the resistor R21 is electrically connected to the PD8 pin of the main control chip U5. The second end of the resistor R21 is electrically connected to the first end of the resistor R22 and the gate of the MOS transistor Q6. The second end of the resistor R22 is electrically connected to the source of the MOS transistor Q6 and grounded. The drain of the MOS transistor Q5 is electrically connected to the current-voltage acquisition circuit module. The source of the MOS transistor Q5 is electrically connected to the resistor R23 and grounded.

[0023] Preferably, the current-voltage acquisition circuit module includes a current acquisition chip U15, a capacitor C64, a capacitor C82, a resistor R72, a resistor R85, a capacitor C83, a resistor R64, a resistor R65, a resistor R66, a controllable precision voltage regulator U16, a resistor R67, a resistor R68, a comparison module U17, a capacitor C79, a resistor R69, a resistor R70, and a resistor R71;

[0024] The LD+OUT pin of the current acquisition chip U15 is electrically connected to one end of the laser and the drain of the MOS transistor Q5. The LD+ pin of the current acquisition chip U15 is electrically connected to the other end of the laser and the positive electrode of the polarized capacitor C43. The VCC pin of the current acquisition chip U15 is electrically connected to the capacitor C48 and the capacitor C82 of the third control circuit module. The capacitor C82 is grounded. The VIOUT pin of the current acquisition chip U15 is electrically connected to the first end of the resistor R85. The second end of the resistor R85 is electrically connected to the first end of the resistor R72, the first end of the capacitor C83, and the first end of the resistor R64. The second end of the resistor R72 is electrically connected to the second ends of the capacitor C64 and the capacitor C83 and grounded. The capacitor C64 is electrically connected to the FILTER pin of the current acquisition chip U15.

[0025] The second end of the resistor R64 is electrically connected to the non-inverting input terminal (+) of an operational amplifier of the comparison module U17 and the first end of the resistor R68. The bottom end of the resistor R68 is grounded.

[0026] The first end of the resistor R66 is electrically connected to the capacitor C48 of the third control circuit module. The second end of the resistor R66 is electrically connected to the first end of the resistor R65, the reference electrode of the controllable precision voltage regulator U16, and the cathode of the controllable precision voltage regulator U16. The anode of the controllable precision voltage regulator U16 is grounded. The second end of the resistor R65 is electrically connected to the first end of the resistor R67 and the inverting input terminal (-) of the said operational amplifier. The second end of the resistor R67 is electrically connected to the output terminal of the said operational amplifier.

[0027] The first terminal of the capacitor C79 is electrically connected to the ADC4 pin of the main control chip, the first terminal of the resistor R71, and the output terminal of another operational amplifier of the controllable precision voltage regulator U16. The second terminal of the capacitor C79 is grounded. The second terminal of the resistor R71 is electrically connected to the first terminal of the resistor R70 and the inverting input terminal (-) of the said another operational amplifier. The resistor R69 is electrically connected to the non-inverting input terminal (+) of the said another operational amplifier.

[0028] Compared with the prior art, the beneficial effects are that the low-power laser control circuit system provided by the present invention has a fast response time and is sensitive, can better control and detect the output current and voltage of the laser, and prevent phenomena such as excessive energy consumption of the laser.

[0029] Other features and advantages of the present utility model will be described in the following description, and some will be obvious from the description, or can be understood through the implementation of the present utility model. The features and advantages of the present utility model can be realized and obtained by the elements and combinations specifically pointed out in the appended claims. These and other features of the present utility model will become more clear and understandable according to the following description and the appended claims, or can be understood through the implementation of the embodiments described in the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0031] Figure 1 It is a circuit diagram of the first voltage conversion circuit module of the low-power laser control circuit system provided by the present utility model.

[0032] Figure 2 It is a circuit diagram of the second circuit voltage conversion module.

[0033] Figure 3 It is a circuit diagram of the main control chip.

[0034] Figure 4 It is a circuit diagram of the laser control circuit unit.

[0035] Figure 5 It is a circuit diagram of the current and voltage acquisition circuit module. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] In order to make the purpose, technical solutions and beneficial technical effects of the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described in this specification are only for explaining the present utility model and not for limiting the present utility model.

[0037] It should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0038] It should also be noted that unless otherwise clearly specified and defined, terms such as "installation", "connection", "connection", "fixation", "setting", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be determined according to specific circumstances.

[0039] In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third" may explicitly or implicitly include one or more of such features. In addition, the meanings of "multiple" and "several" refer to two or more, unless otherwise clearly and specifically defined.

[0040] Please refer to Figures 1 to 5 , the present utility model provides a low-power laser control circuit system, including: a first voltage conversion circuit module, a second circuit voltage conversion module, a main control chip U5, a laser control circuit unit, and a current-voltage acquisition circuit module;

[0041] The first voltage conversion circuit module is electrically connected to the second circuit voltage conversion module, the second circuit voltage conversion module is electrically connected to the main control chip, the laser control circuit unit is electrically connected to the first voltage conversion module, the main control chip U5, and the laser, and the current-voltage acquisition circuit module is electrically connected to the laser control circuit unit and the main control chip U5.

[0042] The first voltage conversion circuit module supplies power (12V) to the laser control circuit unit and converts 12V DC power into 5V DC power. The second voltage conversion circuit module converts 5V DC power into 3.3V DC power to supply power to the main control chip. The laser control circuit unit adjusts the duty cycle of the analog pulse signal and outputs it to the laser to enable the laser to work properly. The current and voltage acquisition circuit module acquires the current and voltage of the laser control circuit unit and sends them to the main control chip, and the main control chip judges and controls the output voltage of the laser control circuit unit within a reasonable range.

[0043] In a preferred embodiment, the first voltage conversion circuit module includes a gas discharge tube D1, a polarized capacitor C3, a capacitor C4, a buck conversion element U1, a capacitor C1, a Schottky diode D2, an inductor L1, a polarized capacitor C2, a resistor R1, a resistor R3, and a fuse F1;

[0044] The first end of the gas discharge tube D1 is connected to the 12V power supply and is electrically connected to the positive electrode of the polarized capacitor C3, the first end of the capacitor C4, and the VIN pin of the first buck conversion element U1. The second end of the gas discharge tube D1 is electrically connected to the negative electrode of the polarized capacitor C3, the second end of the capacitor C4, and is grounded.

[0045] The PH pin of the buck conversion element U1 is electrically connected to the first end of the inductor L1. The BOOT pin of the buck conversion element U1 is electrically connected to the first end of the capacitor C1. The VSENSE pin of the buck conversion element U1 is electrically connected to the resistor R3. The second end of the capacitor C1 is electrically connected to the first end of the inductor L1. The second end of the inductor L1 is electrically connected to the positive electrode of the polarized capacitor C2, the first end of the resistor R1, and the first end of the fuse F1. The second end of the resistor R1 is electrically connected to the resistor R3, and the resistor R3 is grounded. It should be noted that in this embodiment, the model of the buck conversion element U1 is TPS5430.

[0046] In this way, the first end of the gas discharge tube D1 is connected to the 12V power supply, converted into a 5V power supply by the buck conversion element U1 and output to the fuse F1, and output from the fuse F1 to the second voltage conversion circuit module.

[0047] In a preferred embodiment, the second voltage conversion circuit module includes a resistor R2, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a second buck conversion module U2, a resistor R4, a capacitor C9, a capacitor C10, an inductor BL1, a capacitor C11, and a fuse F2;

[0048] The first end of the resistor R2 is electrically connected to the fuse F1. The second end of the resistor R2 is electrically connected to the VDD pin of the capacitor C5, capacitor C6, capacitor C7, capacitor C8, and the second buck conversion module U2. The GND pins of the capacitor C5, capacitor C6, capacitor C7, capacitor C8, and the second buck conversion module U2 are electrically connected to the resistor R4 and grounded. The VOUT pin of the second buck conversion module U2 is electrically connected to the capacitor C9, capacitor C10, and the inductor BL1. The inductor BL1 is electrically connected to the capacitor C11 and the fuse F2. The capacitor C9, capacitor C10, and capacitor C11 are electrically connected to the GND pin of the second buck conversion module U2 and grounded. It should be noted that in this embodiment, the model of the second buck conversion module U2 is BL8071CLATR33.

[0049] In this way, after the 5V power supply is output to the second buck conversion module U2 of the second voltage conversion circuit module through the fuse F1, the second buck conversion module U2 converts the 5V power supply into a 3.3V power supply and outputs it to the main control chip through the fuse F2.

[0050] In a preferred embodiment, the laser control circuit unit includes a first control circuit module. The first control circuit module includes the capacitor C32, capacitor C33, capacitor C34, polarized capacitor C35, capacitor C36, capacitor C37, capacitor C38, capacitor C39, resistor R24, resistor R25, Schottky diode D10, resistor R27, resistor R28, inductor L2, capacitor C40, capacitor C41, polarized capacitor C42, polarized capacitor C43, MOS transistor Q3, MOS transistor Q4, and a buck power supply control element U7.

[0051] The capacitor C32 is electrically connected to the VCC pin of the buck power supply control element U7. The positive electrode of the polarized capacitor C35, the first end of the capacitor C36, and the VIN pin of the buck power supply control element U7 are electrically connected to the first end of the gas discharge tube D1 of the first voltage conversion circuit module. The negative electrode of the polarized capacitor C35 and the second end of the capacitor C36 are electrically connected to the capacitor C38 and grounded. The capacitor C38 is electrically connected to the EN pin of the buck power supply control element U7. The capacitor C39 is electrically connected to the SGNG pin and the SS pin of the buck power supply control element U7 and grounded. The resistor R24 is electrically connected to the first end of the gas discharge tube D1 and the RON pin of the buck power supply control element U7.

[0052] The PGND pin of the buck power supply control component U7 is electrically connected to the source of the MOS transistor Q3. The LG pin of the buck power supply control component U7 is electrically connected to the gate of the MOS transistor Q3. The drain of the MOS transistor Q3 is electrically connected to the source of the MOS transistor, the SW pin of the buck power supply control component U7, and the inductor L2. The HG pin of the buck power supply control component U7 is electrically connected to the gate of the MOS transistor Q4. The BST pin of the buck power supply control component U7 is electrically connected to the capacitor C37. The capacitor C37 is electrically connected to the resistor R25, the SW pin of the buck power supply control component U7, and the Schottky diode D10. The resistor R25 is electrically connected to the ILIM pin of the buck power supply control component U7. The inductor L2 is electrically connected to the resistor R28, the capacitor C44, the capacitor C40, the capacitor C41, the positive electrode of the polarized capacitor C42, the positive electrode of the polarized capacitor C43, and the laser. The resistor R28 is electrically connected to the resistor R27, the FB pin of the buck power supply control component U7, and the capacitor C44. The resistor R27 is grounded. The capacitor C40 is electrically connected to the capacitor C41 and grounded. The negative electrode of the polarized capacitor C42 is electrically connected to the negative electrode of the polarized capacitor C43 and grounded.

[0053] In a preferred embodiment, the laser control circuit unit further includes a second control circuit module. The control circuit module includes a resistor R29, a resistor R30, a resistor R36, a resistor R40, a MOS transistor Q8, a resistor R33, a resistor R38, and a MOS transistor Q7.

[0054] The resistor R29 and the resistor R30 are electrically connected to the fuse F1 of the first voltage conversion circuit module. The resistor R30 is electrically connected to the drain of the MOS transistor Q8 and the first end of the resistor R33. The first end of the resistor R36 is electrically connected to the PE2 pin of the main control chip U5. The second end of the resistor R36 is electrically connected to the gate of the MOS transistor Q8 and the first end of the resistor R40. The source of the MOS transistor Q8 is electrically connected to the second end of the resistor R40 and grounded.

[0055] The second end of the resistor R33 is electrically connected to the gate of the MOS transistor Q7 and the first end of the resistor R38. The resistor R29 is electrically connected to the drain of the MOS transistor Q7 and the EN pin of the buck power supply control component U7. The source of the MOS transistor Q7 is electrically connected to the second end of the resistor R38 and grounded. It should be noted that in this embodiment, the model of the buck power supply control component U7 is LM3150, and the model of the main control chip U5 is STM32G474VET6.

[0056] Thus, the buck power supply control component U7 is a buck power supply control component with a supply voltage of 12V DC. When the EN pin of the buck power supply control component U7 is greater than 0.6V, the buck power supply control component U7 starts, and adjusts the PWM duty cycle of the buck power supply control component U7 to obtain an output of 2.7V DC to supply the laser, enabling the laser to operate normally.

[0057] In a preferred embodiment, the laser control circuit unit further includes a third control circuit module, and the third control circuit module includes a resistor R31, a resistor R32, a resistor R34, a resistor R35, a resistor R37, a resistor R39, a capacitor C47, a capacitor C48, a capacitor C49, a capacitor C50, a capacitor C51, and an operational amplifier module U9;

[0058] The first end of the resistor R32 is grounded, the second end of the resistor R32 is electrically connected to the first end of the resistor R31 and the 1IN- pin of the operational amplifier module U9, the second end of the resistor R31 is electrically connected to the 1OUT pin of the operational amplifier module U9, the 1IN+ pin of the operational amplifier module U9 is electrically connected to the first end of the capacitor C50, the first end of the resistor R37, and the first end of the resistor R34, the second end of the resistor R34 is electrically connected to the PA6 pin of the main control chip U5, the second end of the resistor R37 is electrically connected to the second end of the capacitor C50 and the VDD- / GND pin of the operational amplifier module U9 and is grounded,

[0059] The VDD+ pin of the operational amplifier module U9 is electrically connected to the capacitor C47, the capacitor C48, and the fuse F1 of the first voltage conversion circuit module, the capacitor C47 and the capacitor C48 are grounded, the 2OUT pin and the 2IN- pin of the operational amplifier module U9 are electrically connected to the first end of the resistor R35, the second end of the resistor R35 is electrically connected to the PA7 pin of the main control chip U5 and the capacitor C49, the capacitor C49 is grounded, the 2IN+ pin of the operational amplifier module U9 is electrically connected to the first end of the resistor R39 and the first end of the capacitor C51, and the second end of the resistor R39 is electrically connected to the second end of the capacitor C51 and is grounded. It should be noted that in this embodiment, the model of the operational amplifier module U9 is TLC2272CD.

[0060] In a preferred embodiment, the laser control circuit unit further includes a fourth control circuit module, and the fourth control circuit module includes a resistor R20, a resistor R21, a resistor R22, a resistor R23, a MOS transistor Q5, and a MOS transistor Q6;

[0061] The first end of the resistor R20 is electrically connected to the 1OUT pin of the operational amplifier module U9. The second end of the resistor R20 is electrically connected to the drain of the MOS transistor Q6 and the gate of the MOS transistor Q5. The first end of the resistor R21 is electrically connected to the PD8 pin of the main control chip U5. The second end of the resistor R21 is electrically connected to the first end of the resistor R22 and the gate of the MOS transistor Q6. The second end of the resistor R22 is electrically connected to the source of the MOS transistor Q6 and grounded.

[0062] The drain of the MOS transistor Q5 is electrically connected to the current-voltage acquisition circuit module. The source of the MOS transistor Q5 is electrically connected to the resistor R23 and grounded. It should be noted that in this embodiment, the model of the operational amplifier module U9 is TLC2272CD. The operational amplifier module U9 calculates and amplifies the voltage (greater than 420 mV) at the PA6 pin of the main control chip to generate a DAC_OUT signal for the MOS transistor Q5. The model of the MOS transistor Q5 is NCE40H12, with a maximum current of 120 A and VGS = 2.5 V. That is, when the voltage at the gate of the MOS transistor Q5 is greater than 2.5 V, the MOS transistor Q5 conducts. In this way, the purpose of controlling the output current of the laser by a small voltage through controlling DAC_OUT can be achieved.

[0063] In a preferred embodiment, the current-voltage acquisition circuit module includes a current acquisition chip U15, a capacitor C64, a capacitor C82, a resistor R72, a resistor R85, a capacitor C83, a resistor R64, a resistor R65, a resistor R66, a controllable precision voltage regulator U16, a resistor R67, a resistor R68, a comparison module U17, a capacitor C79, a resistor R69, a resistor R70, and a resistor R71.

[0064] The LD+OUT pin of the current acquisition chip U15 is electrically connected to one end of the laser and the drain of the MOS transistor Q5. The LD+ pin of the current acquisition chip U15 is electrically connected to the other end of the laser and the positive pole of the polarized capacitor C43. The VCC pin of the current acquisition chip U15 is electrically connected to the capacitor C48 and the capacitor C82 of the third control circuit module. The capacitor C82 is grounded. The VIOUT pin of the current acquisition chip U15 is electrically connected to the first end of the resistor R85. The second end of the resistor R85 is electrically connected to the first ends of the resistor R72, the capacitor C83, and the resistor R64. The second end of the resistor R72 is electrically connected to the second ends of the capacitor C64 and the capacitor C83 and grounded. The capacitor C64 is electrically connected to the FILTER pin of the current acquisition chip U15.

[0065] The second terminal of the resistor R64 is electrically connected to the first terminal of the resistor R68 and the non-inverting input terminal (+) of an operational amplifier of the comparison module U17. The bottom end of the resistor R68 is grounded.

[0066] The first terminal of the resistor R66 is electrically connected to the capacitor C48 of the third control circuit module. The second terminal of the resistor R66 is electrically connected to the first terminal of the resistor R65, the reference electrode of the adjustable precision voltage reference U16, and the cathode of the adjustable precision voltage reference U16. The anode of the adjustable precision voltage reference U16 is grounded. The second terminal of the resistor R65 is electrically connected to the first terminal of the resistor R67 and the inverting input terminal (-) of the said operational amplifier. The second terminal of the resistor R67 is electrically connected to the output terminal of the said operational amplifier.

[0067] The first terminal of the capacitor C79 is electrically connected to the ADC4 pin of the main control chip, the first terminal of the resistor R71, and the output terminal of another operational amplifier of the adjustable precision voltage reference U16. The second terminal of the capacitor C79 is grounded. The second terminal of the resistor R71 is electrically connected to the first terminal of the resistor R70 and the inverting input terminal (-) of the said another operational amplifier. The resistor R69 is electrically connected to the non-inverting input terminal (+) of the said another operational amplifier. It should be noted that in this embodiment, the model of the current acquisition chip U15 is ACS712, and the model of the adjustable precision voltage reference U16 is TL431.

[0068] In this way, the current acquisition chip U15 is connected in series to the circuit of the laser to collect the output current of the laser. Since the range of the collected analog voltage value is relatively large, the adjustable precision voltage reference U16 is used to provide a reference voltage of 2.5V. The two voltages are connected to the comparison module U17 to perform subtraction to obtain VOUTA and then sent back to the main control chip U5 through the resistor R36. The main control chip U5 determines whether its output current is within a reasonable range value (generally not exceeding 10A).

[0069] Since the value of VOUTA obtained by performing subtraction in the comparison module U17 is relatively small, in order to facilitate the detection of the output voltage of the laser, the output voltage of VOUTA is amplified 6 times by the operational amplifier in the comparison module U17 to obtain the voltage value ADC4 and then sent back to the main control chip U5. The main control chip U5 determines whether its output voltage is within a reasonable range value (generally not exceeding 2.8V). This low-power laser control circuit system has a fast response time and is sensitive, and can better control and detect the output current and voltage of the laser, preventing phenomena such as excessive energy consumption of the laser.

[0070] The present utility model is not limited only to what is described in the specification and embodiments. Therefore, for those skilled in the art, additional advantages and modifications can be easily achieved. Thus, without departing from the spirit and scope of the general concept defined by the claims and their equivalents, the present utility model is not limited to specific details, representative devices, and the illustrative examples shown and described herein.

Claims

1. A low energy consumption laser control circuit system, characterized in that: include: A first voltage conversion circuit module, a second voltage conversion circuit module, a main control chip U5, a laser control circuit unit and a current and voltage acquisition circuit module; The first voltage conversion circuit module is electrically connected to the second circuit voltage conversion module, the second circuit voltage conversion module is electrically connected to the main control chip, the laser control circuit unit is electrically connected to the first voltage conversion module, the main control chip U5 and the laser, and the current and voltage acquisition circuit module is electrically connected to the laser control circuit unit and the main control chip U5.

2. The low energy consumption laser control circuit system as claimed in claim 1, characterized in that: The first voltage conversion circuit module includes a gas discharge tube D1, a polar capacitor C3, a capacitor C4, a step-down conversion element U1, a capacitor C1, a Schottky diode D2, an inductor L1, a polar capacitor C2, a resistor R1, a resistor R3 and a fuse F1; The first end of the gas discharge tube D1 is connected to a 12V power supply and is electrically connected to the positive electrode of the polar capacitor C3, the first end of the capacitor C4, and the VIN pin of the first step-down conversion element U1. The second end of the gas discharge tube D1 is electrically connected to the negative electrode of the polar capacitor C3, the second end of the capacitor C4, and is grounded. The PH pin of the buck conversion element U1 is electrically connected to the first end of the inductor L1, the BOOT pin of the buck conversion element U1 is electrically connected to the first end of the capacitor C1, the VSENSE pin of the buck conversion element U1 is electrically connected to the resistor R3, the second end of the capacitor C1 is electrically connected to the first end of the inductor L1, the second end of the inductor L1 is electrically connected to the positive electrode of the polarized capacitor C2, the first end of the resistor R1 and the first end of the fuse F1, the second end of the resistor R1 is electrically connected to the resistor R3, and the resistor R3 is grounded.

3. The low energy consumption laser control circuit system as claimed in claim 1, characterized in that: The second voltage conversion circuit module includes a resistor R2, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a second step-down conversion module U2, a resistor R4, a capacitor C9, a capacitor C10, an inductor BL1, a capacitor C11 and a fuse F2; The first end of the resistor R2 is electrically connected to the fuse F1, the second end of the resistor R2 is electrically connected to the capacitor C5, the capacitor C6, the capacitor C7, the capacitor C8 and the VDD pin of the second buck conversion module U2, the capacitor C5, the capacitor C6, the capacitor C7, the capacitor C8 and the GND pin of the second buck conversion module U2 are electrically connected to the resistor R4 and grounded, the VOUT pin of the second buck conversion module U2 is electrically connected to the capacitor C9, the capacitor C10 and the inductor BL1, the inductor BL1 is electrically connected to the capacitor C11 and the fuse F2, the capacitor C9, the capacitor C10, the capacitor C11 is electrically connected to the GND pin of the second buck conversion module U2 and grounded.

4. The low energy consumption laser control circuit system as claimed in claim 1, characterized in that: The laser control circuit unit includes a first control circuit module, which includes capacitor C32, capacitor C33, capacitor C34, polar capacitor C35, capacitor C36, capacitor C37, capacitor C38, capacitor C39, resistor R24, resistor R25, Schottky diode D10, resistor R27, resistor R28, inductor L2, capacitor C40, capacitor C41, polar capacitor C42, polar capacitor C43, MOS tube Q3, MOS tube Q4 and buck power supply control element U7; The capacitor C32 is electrically connected to the VCC pin of the buck power control element U7, the positive electrode of the polar capacitor C35, the first end of the capacitor C36 and the VIN pin of the buck power control element U7 are electrically connected to the first end of the gas discharge tube D1 of the first voltage conversion circuit module, the negative electrode of the polar capacitor C35 and the second end of the capacitor C36 are electrically connected to the capacitor C38 and grounded, the capacitor C38 is electrically connected to the EN pin of the buck power control element U7, the capacitor C39 is electrically connected to the SGNG pin and the SS pin of the buck power control element U7 and grounded, the resistor R24 ​​is electrically connected to the first end of the gas discharge tube D1 and the RON pin of the buck power control element U7, The PGND pin of the step-down power supply control element U7 is electrically connected to the source of the MOS tube Q3, the LG pin of the step-down power supply control element U7 is electrically connected to the gate of the MOS tube Q3, the drain of the MOS tube Q3 is electrically connected to the source of the MOS tube, the SW pin of the step-down power supply control element U7 and the inductor L2, the HG pin of the step-down power supply control element U7 is electrically connected to the gate of the MOS tube Q4, the BST pin of the step-down power supply control element U7 is electrically connected to the capacitor C37, the capacitor C37 is electrically connected to the resistor R25, the SW pin of the step-down power supply control element U7 and the Schottky diode The tube D10 is electrically connected, the resistor R25 is electrically connected to the ILIM pin of the step-down power supply control element U7, the inductor L2 is electrically connected to the resistor R28, the capacitor C44, the capacitor C40, the capacitor C41, the positive electrode of the polarized capacitor C42, the positive electrode of the polarized capacitor C43 and the laser, the resistor R28 is electrically connected to the resistor R27, the FB pin of the step-down power supply control element U7 and the capacitor C44, the resistor R27 is grounded, the capacitor C40 is electrically connected to the capacitor C41 and is grounded, and the negative electrode of the polarized capacitor C42 is electrically connected to the negative electrode of the polarized capacitor C43 and is grounded.

5. The low energy consumption laser control circuit system as claimed in claim 2, characterized in that: The laser control circuit unit further includes a second control circuit module, which includes a resistor R29, a resistor R30, a resistor R36, a resistor R40, a MOS tube Q8, a resistor R33, a resistor R38 and a MOS tube Q7; The resistor R29 and the resistor R30 are electrically connected to the fuse F1 of the first voltage conversion circuit module, the resistor R30 is electrically connected to the drain of the MOS tube Q8 and the first end of the resistor R33, the first end of the resistor R36 is electrically connected to the PE2 pin of the main control chip U5, the second end of the resistor R36 is electrically connected to the gate of the MOS tube Q8 and the first end of the resistor R40, the source of the MOS tube Q8 is electrically connected to the second end of the resistor R40 and is grounded, The second end of the resistor R33 is electrically connected to the gate of the MOS tube Q7 and the first end of the resistor R38, the resistor R29 is electrically connected to the drain of the MOS tube Q7 and the EN pin of the step-down power supply control element U7, and the source of the MOS tube Q7 is electrically connected to the second end of the resistor R38 and grounded.

6. The low energy consumption laser control circuit system as claimed in claim 2, characterized in that: The laser control circuit unit further includes a third control circuit module, which includes a resistor R31, a resistor R32, a resistor R34, a resistor R35, a resistor R37, a resistor R39, a capacitor C47, a capacitor C48, a capacitor C49, a capacitor C50, a capacitor C51 and an operational amplifier module U9; The first end of the resistor R32 is grounded, the second end of the resistor R32 is electrically connected to the first end of the resistor R31 and the 1IN- pin of the operational amplifier module U9, the second end of the resistor R31 is electrically connected to the 1OUT pin of the operational amplifier module U9, the 1IN+ pin of the operational amplifier module U9 is electrically connected to the first end of the capacitor C50, the first end of the resistor R37 and the first end of the resistor R34, the second end of the resistor R34 is electrically connected to the PA6 pin of the main control chip U5, the second end of the resistor R37 is electrically connected to the second end of the capacitor C50 and the VDD- / GND pin of the operational amplifier module U9 and is grounded, The VDD+ pin of the operational amplifier module U9 is electrically connected to capacitor C47, capacitor C48 and fuse F1 of the first voltage conversion circuit module, and the capacitor C47 and capacitor C48 are grounded. The 2OUT pin and 2IN- pin of the operational amplifier module U9 are electrically connected to the first end of the resistor R35, and the second end of the resistor R35 is electrically connected to the PA7 pin of the main control chip U5 and the capacitor C49, and the capacitor C49 is grounded. The 2IN+ pin of the operational amplifier module U9 is electrically connected to the first end of the resistor R39 and the first end of the capacitor C51, and the second end of the resistor R39 is electrically connected to the second end of the capacitor C51 and grounded.

7. The low energy consumption laser control circuit system as claimed in claim 1, characterized in that: The laser control circuit unit further includes a fourth control circuit module, and the fourth control circuit module includes a resistor R20, a resistor R21, a resistor R22, a resistor R23, a MOS transistor Q5, and a MOS transistor Q6; The first end of the resistor R20 is electrically connected to the 1OUT pin of the operational amplifier module U9, the second end of the resistor R20 is electrically connected to the drain of the MOS tube Q6 and the gate of the MOS tube Q5, the first end of the resistor R21 is electrically connected to the PD8 pin of the main control chip U5, the second end of the resistor R21 is electrically connected to the first end of the resistor R22 and the gate of the MOS tube Q6, the second end of the resistor R22 is electrically connected to the source of the MOS tube Q6 and grounded, the drain of the MOS tube Q5 is electrically connected to the current and voltage acquisition circuit module, and the source of the MOS tube Q5 is electrically connected to the resistor R23 and grounded.

8. The low energy consumption laser control circuit system as claimed in claim 7, characterized in that: The current and voltage acquisition circuit module includes a current acquisition chip U15, a capacitor C64, a capacitor C82, a resistor R72, a resistor R85, a capacitor C83, a resistor R64, a resistor R65, a resistor R66, a controllable precision voltage source U16, a resistor R67, a resistor R68, a comparison module U17, a capacitor C79, a resistor R69, a resistor R70 and a resistor R71; The LD+OUT pin of the current acquisition chip U15 is electrically connected to one end of the laser and the drain of the MOS tube Q5, the LD+ pin of the current acquisition chip U15 is electrically connected to the other end of the laser and the positive electrode of the polarized capacitor C43, the VCC pin of the current acquisition chip U15 is electrically connected to the capacitor C48 and the capacitor C82 of the third control circuit module, the capacitor C82 is grounded, the VIOUT pin of the current acquisition chip U15 is electrically connected to the first end of the resistor R85, the second end of the resistor R85 is electrically connected to the first end of the resistor R72, the first end of the capacitor C83 and the first end of the resistor R64, the second end of the resistor R72 is electrically connected to the second ends of the capacitor C64 and the capacitor C83 and is grounded, the capacitor C64 is electrically connected to the FILTER pin of the current acquisition chip U15, The second end of the resistor R64 is electrically connected to the first end of the resistor R68 and the same-inverting input terminal (+) of an operational amplifier of the comparison module U17, and the bottom end of the resistor R68 is grounded. The first end of the resistor R66 is electrically connected to the capacitor C48 of the third control circuit module, the second end of the resistor R66 is electrically connected to the first end of the resistor R65, the reference electrode of the controllable precision voltage-stabilizing source U16 and the cathode of the controllable precision voltage-stabilizing source U16, the anode of the controllable precision voltage-stabilizing source U16 is grounded, the second end of the resistor R65 is electrically connected to the first end of the resistor R67 and the reverse input terminal (-) of the operational amplifier, and the second end of the resistor R67 is electrically connected to the output terminal of the operational amplifier. The first end of the capacitor C79 is electrically connected to the ADC4 pin of the main control chip, the first end of the resistor R71 and the output end of another operational amplifier of the controllable precision voltage regulator U16, the second end of the capacitor C79 is grounded, the second end of the resistor R71 is electrically connected to the first end of the resistor R70 and the reverse input end (-) of the other operational amplifier, and the resistor R69 is electrically connected to the same direction input end (+) of the other operational amplifier.

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