Driving circuit and laser device

Abstract

The utility model discloses a driving circuit and laser equipment, the driving circuit comprises a voltage regulating module, a main control module, a voltage protection detection module and a current protection detection module, and the voltage regulating module is used for generating, regulating and outputting a driving voltage and a driving current to a laser based on an input voltage according to a voltage regulating signal. The master control module is used for outputting a voltage regulating signal according to the configuration signal. The voltage protection detection module and the current protection detection module can obtain the corresponding voltage feedback signal and the current feedback signal based on the driving voltage and the driving current respectively, so that the main control module can adjust the voltage regulation signal according to the voltage feedback signal and the current feedback signal, and the output of the driving circuit is more stable.

Description

Technical Field

[0001] This application belongs to the field of laser technology, and in particular relates to a driving circuit and a laser device. Background Technology

[0002] Currently, externally modulated lasers typically require an external driving circuit to modulate the power supply output to obtain the driving voltage used to drive the externally modulated laser. However, the output of common driving circuits fluctuates greatly and cannot stably drive the externally modulated laser. Utility Model Content

[0003] The purpose of this application is to provide a driving circuit and laser device, which aims to solve the output stability problem of traditional laser driving circuits.

[0004] A first aspect of this application provides a driving circuit for driving a laser, comprising: a voltage regulation module connected to the laser, configured to generate and adjust a driving voltage and a driving current supplied to the laser based on an input voltage and a voltage regulation signal; a main control module connected to the voltage regulation module, configured to output the voltage regulation signal; a voltage protection detection module disposed at the output terminal of the voltage regulation module and connected to the main control module, configured to provide a voltage feedback signal to the main control module based on the driving voltage; and a current protection detection module disposed at the output terminal of the voltage regulation module and connected to the main control module, configured to provide a current feedback signal to the main control module based on the driving current; the main control module is further configured to adjust the voltage regulation signal according to the voltage feedback signal and the current feedback signal, so that the driving voltage output by the voltage regulation module reaches a target voltage and the driving current reaches a target current.

[0005] In one embodiment, the voltage regulation module includes a Boost unit, which is used to adjust the driving voltage and the driving current based on the input voltage and the voltage regulation signal.

[0006] In one embodiment, the Boost unit includes a voltage regulating inductor, a voltage regulating switch, and a unidirectional conductor; the first terminal of the voltage regulating inductor is used to receive the input voltage, the second terminal of the voltage regulating inductor is connected to the first conducting terminal of the voltage regulating switch and the input terminal of the unidirectional conductor, the control terminal of the voltage regulating switch is connected to the main control module, the second conducting terminal of the voltage regulating switch is grounded, and the output terminal of the unidirectional conductor is used to connect to the laser.

[0007] In one embodiment, the voltage protection detection module includes a voltage divider unit, which is connected to the output terminal of the voltage regulation module and the main control module respectively. The voltage divider unit is used to divide the driving voltage at the output terminal of the voltage regulation module to provide a corresponding voltage feedback signal to the main control module based on the driving voltage.

[0008] In one embodiment, the voltage divider unit includes a first voltage divider resistor and a second voltage divider resistor. The first end of the first voltage divider resistor is connected to the output end of the voltage regulating module. The second end of the first voltage divider resistor is connected to the main control module and the first end of the second voltage divider resistor, respectively. The second end of the second voltage divider resistor is grounded.

[0009] In one embodiment, the current protection detection module includes a current limiting unit. The first end of the current limiting unit is connected to the output end of the voltage regulation module, the second end of the current limiting unit is used to connect to the laser, and both ends of the current limiting unit are connected to the main control module.

[0010] In one embodiment, the current limiting unit includes several current limiting resistors.

[0011] In one embodiment, the main control module includes a Boost chip, which is used to obtain the target voltage and the target current based on the configuration signal, and output the voltage regulation signal according to the target voltage, the target current, the voltage feedback signal and the current feedback signal.

[0012] In one embodiment, the system further includes an input filtering module and an output filtering module. The input filtering module is connected to the input terminal of the voltage regulation module, and the output filtering module is connected between the output terminal of the voltage regulation module and the laser.

[0013] A second aspect of this application provides a laser device, including a laser and a driving circuit as described above, the driving circuit being connected to the laser.

[0014] The beneficial effects of this application embodiment compared with the prior art are: the voltage protection detection module and the current protection detection module can obtain corresponding voltage feedback signals and current feedback signals based on the driving voltage and driving current, respectively, so that the main control module can adjust the voltage regulation signal according to the voltage feedback signal and the current feedback signal, so as to make the output of the driving circuit more stable. Attached Figure Description

[0015] Figure 1 A schematic diagram of the driving circuit provided in one embodiment of this application;

[0016] Figure 2 A circuit diagram of a driving circuit provided in an embodiment of this application;

[0017] Figure 3 Another circuit diagram of the driving circuit provided in one embodiment of this application;

[0018] Figure 4 This is a schematic diagram of a laser device provided in one embodiment of this application. Detailed Implementation

[0019] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0020] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0022] Figure 1 A schematic diagram of a driving circuit according to an embodiment of this application is shown. For ease of explanation, only the parts relevant to this embodiment are shown, and the details are as follows:

[0023] A driving circuit 10 for driving a laser 20 includes: a voltage regulation module 100, a main control module 200, a voltage protection detection module 300, and a current protection detection module 400.

[0024] A voltage regulation module 100 is connected to the laser 20 and is used to generate and adjust the driving voltage and driving current supplied to the laser 20 based on the input voltage and a voltage regulation signal. A main control module 200 is connected to the voltage regulation module 100 and is used to output the voltage regulation signal. A voltage protection detection module 300 is located between the output terminal of the voltage regulation module 100 and the laser 20, and is connected to the main control module 200. It is used to provide a corresponding voltage feedback signal to the main control module 200 based on the driving voltage. A current protection detection module 400 is located between the output terminal of the voltage regulation module 100 and the laser 20, and is connected to the main control module 200. It is used to provide a corresponding current feedback signal to the main control module 200 based on the driving current. The main control module 200 is used to adjust the voltage regulation signal according to the voltage feedback signal and the current feedback signal so that the driving voltage output by the voltage regulation module reaches the target voltage and the driving current reaches the target current. The target voltage and target current can be configured by a configuration signal for the main control module 200.

[0025] The voltage protection detection module 300 and the current protection detection module 400 can obtain corresponding voltage feedback signals and current feedback signals based on the driving voltage and driving current, respectively. This allows the main control module 200 to adjust the voltage regulation signal according to the voltage feedback signal and the current feedback signal, so as to make the output of the drive circuit 10 more stable.

[0026] Specifically, the target voltage can be a voltage range (e.g., a voltage range centered on a voltage value), the target current can be a current range (e.g., a current range with a current value as the maximum threshold), making the drive voltage reach the target voltage can mean controlling the drive voltage within a certain range corresponding to the target voltage, and making the drive current reach the target current can mean controlling the drive current within a certain range corresponding to the target current.

[0027] In some embodiments, the configuration signal may be a pulse width modulation (PWM) signal. The main control module 200 can connect to an external control device through a corresponding interface to obtain the configuration signal.

[0028] In some embodiments, the driving circuit 10 and the laser 20 can be connected through corresponding interfaces.

[0029] In some embodiments, the input terminal of the voltage regulating module 100 can be connected to an external power supply 30 to obtain an input voltage.

[0030] In one embodiment, the voltage regulation module 100 includes a boost unit for adjusting the drive voltage and drive current based on the input voltage and the voltage regulation signal.

[0031] The voltage regulation signal can be used to control the on and off of the switching devices in the Boost unit, thereby boosting the input voltage to obtain and output the drive voltage.

[0032] The main control module 200 can output a corresponding voltage regulation signal according to actual needs, such as based on the received configuration signal, so as to adjust the drive voltage through the voltage regulation signal.

[0033] In one embodiment, such as Figure 2 As shown, the main control module 200 includes a Boost chip U1. The Boost boost unit includes a voltage regulating inductor L1, a voltage regulating switch Q1, and a unidirectional conductor. The first end of the voltage regulating inductor L1 is used to receive the input voltage. The second end of the voltage regulating inductor L1 is connected to the first conducting end of the voltage regulating switch Q1 and the input end of the unidirectional conductor. The control end and the second conducting end of the voltage regulating switch Q1 are both connected to the main control module 200. The output end of the unidirectional conductor is used to connect to the laser 20.

[0034] Specifically, the Boost chip U1 has a signal output terminal GATE and a ground voltage terminal IS. The signal output terminal GATE can be connected to the control terminal of the voltage regulator switch Q1, and the ground voltage terminal IS can be connected to the second conducting terminal of the voltage regulator switch Q1. Based on the model of the voltage regulator switch Q1, the Boost chip U1 can control the voltage of the second conducting terminal of the voltage regulator switch Q1 through the ground voltage terminal IS, and output a voltage regulation signal to the control terminal of the voltage regulator switch Q1 through the signal output terminal GATE to control the conduction and cutoff of the voltage regulator switch Q1.

[0035] A unidirectional conductor may include multiple diodes connected in parallel. Figure 2 Diodes D1, D2, and D3 are shown; the number of diodes can be set according to actual needs.

[0036] In some embodiments, the voltage regulating switch Q1 can be an N-type MOSFET. The first conducting terminal of the voltage regulating switch Q1 corresponds to the drain of the N-type MOSFET, the second conducting terminal of the voltage regulating switch Q1 corresponds to the source of the N-type MOSFET, and the control terminal of the voltage regulating switch Q1 corresponds to the gate of the N-type MOSFET. When the voltage difference between the gate and the source of the N-type MOSFET is greater than a set threshold, the drain and source of the N-type MOSFET are connected. The N-type MOSFET can be used to prevent reverse power connection.

[0037] In some embodiments, the voltage regulating switch Q1 can be a P-type MOSFET.

[0038] In some embodiments, with the control logic of the main control module 200 fixed, a level conversion unit can be set between the control terminals of the main control module 200 and the voltage regulator switch Q1, based on the voltage regulation signal output by the main control module 200 and the model of the voltage regulator switch Q1. The level conversion unit may include an NPN transistor. For example, when the voltage regulator switch Q1 is a P-type MOSFET, the main control module 200 can output a high level to control the P-type MOSFET to turn off and output a low level to control the P-type MOSFET to turn on.

[0039] In some embodiments, the signal output terminal GATE is connected to the control terminal of the voltage regulating switch Q1 through the first resistor R1, the ground voltage terminal IS is connected to the second conducting terminal of the voltage regulating switch Q1 through the second resistor R2, the first terminal of the third resistor R3 is connected to the second conducting terminal of the voltage regulating switch Q1, the second terminal of the third resistor R3 is connected to the first terminal of the first capacitor C1 and grounded through the fourth resistor R11, and the second terminal of the first capacitor C1 is connected to the ground voltage terminal IS.

[0040] In some embodiments, the configuration signal may be a pulse width modulation (PWM) signal. The main control module 200 can be connected to the external control device 40 through a corresponding interface to obtain the configuration signal. Specifically, the PWM pin and IADJ pin of the Boost chip U1 can be connected to the external control device 40 to obtain the configuration signal. The Boost chip U1 can configure the output range of the drive voltage and drive current according to the first configuration signal obtained from the IADJ pin, and within the determined output range, adjust the specific drive voltage and drive current according to the second configuration signal received from the PWM pin. For example, the Boost chip U1 can change the output range of the drive voltage from 0 to 140mV to 0 to 2.25V according to the first configuration signal, and perform linear voltage regulation according to the duty cycle of the second configuration signal.

[0041] The IADJ pin and the PWM pin can be connected to different external control devices 40 or the same external control device 40 through different interfaces, and this embodiment does not limit them.

[0042] In one embodiment, the voltage protection detection module 300 includes a voltage divider unit, which is connected to the output terminal of the voltage regulation module 100 and the main control module 200 respectively. The voltage divider unit is used to divide the driving voltage at the output terminal of the voltage regulation module 100 to provide a corresponding voltage feedback signal to the main control module 200 based on the driving voltage.

[0043] The voltage divider unit divides the driving voltage according to a certain ratio to obtain a voltage feedback signal. The main control module 200 can then determine the parameters of the driving voltage based on the voltage feedback signal, and thus determine whether the driving voltage has reached the target voltage. The main control module 200 can also perform overvoltage detection based on the voltage feedback signal to achieve overvoltage protection.

[0044] In one embodiment, the voltage divider unit includes a first voltage divider resistor R5 and a second voltage divider resistor R6. The first end of the first voltage divider resistor R5 is connected to the output end of the voltage regulating module 100, the second end of the first voltage divider resistor R5 is connected to the main control module 200 and the first end of the second voltage divider resistor R6, and the second end of the second voltage divider resistor R6 is grounded.

[0045] The voltage division ratio of the voltage divider unit can be controlled by configuring the ratio between the first voltage divider resistor R5 and the second voltage divider resistor R6. For example, if the ratio between the first voltage divider resistor R5 and the second voltage divider resistor R6 is 1:n, the larger n is, the larger the voltage division ratio, and the larger the voltage value of the voltage feedback signal obtained when the driving voltage remains constant.

[0046] In one embodiment, the current protection detection module 400 includes a current limiting unit. The first end of the current limiting unit is connected to the output end of the voltage regulating module 100, the second end of the current limiting unit is used to connect to the laser 20, and both ends of the current limiting unit are connected to the main control module 200.

[0047] It is understandable that when the real-time drive current flows through the current limiting unit, a voltage divider will be generated across the current limiting unit. By connecting both ends of the current limiting unit to the main control module 200, the main control module 200 can obtain the potential difference between the two ends of the current limiting unit and obtain the current feedback signal. The main control module 200 can also perform overcurrent detection based on the current feedback signal to achieve overcurrent protection.

[0048] In one embodiment, the current limiting unit includes a plurality of current limiting resistors connected in parallel.

[0049] Specifically, the current limiting unit includes a first current limiting resistor R7, a second current limiting resistor R8, a third current limiting resistor R9, and a fourth current limiting resistor R10. The first end of the first current limiting resistor R7, the first end of the second current limiting resistor R8, the first end of the third current limiting resistor R9, and the first end of the fourth current limiting resistor R10 are all connected to the output terminal of the voltage regulating module 100. The second end of the first current limiting resistor R7, the second end of the second current limiting resistor R8, the second end of the third current limiting resistor R9, and the second end of the fourth current limiting resistor R10 are all used to connect to the laser 20.

[0050] In one embodiment, the main control module 200 includes a Boost chip U1, which is used to obtain the target voltage and target current based on the configuration signal, and output a voltage regulation signal according to the target voltage, target current, voltage feedback signal and current feedback signal.

[0051] It is understandable that the Boost chip U1 has several pins, which can be connected to the voltage regulation module 100, the voltage protection detection module 300 and the current protection detection module 400 through each pin.

[0052] In one embodiment, the driving circuit 10 further includes an input filtering module 500 and an output filtering module 600. The input filtering module 500 is connected to the input terminal of the voltage regulating module 100, and the output filtering module 600 is connected between the output terminal of the voltage regulating module 100 and the laser 20.

[0053] The input filtering module 500 is used to filter the input voltage to maintain its stability, while the output filtering unit is used to filter the output voltage of the drive circuit 10 to maintain its stability.

[0054] In some embodiments, the input filtering module 500 includes a first filtering inductor L2 and a first filtering capacitor C6. The first end of the first filtering inductor L2 is connected to an external power supply 30 to receive an input voltage. The second end of the first filtering inductor L2 is connected to the input terminal of the voltage regulating module 100. The first end of the first filtering capacitor C6 is connected to the second end of the first filtering inductor L2, and the second end of the first filtering capacitor C6 is grounded.

[0055] The output filtering module 600 includes a second filtering inductor L3, a third filtering inductor L4, a second filtering capacitor C7, and a third filtering capacitor C8. The first terminal of the second filtering inductor L3 is connected to the output terminal of the current protection detection module 400, and the second terminal of the second filtering inductor L3 is connected to the positive terminal of the laser 20. The first terminal of the third filtering inductor L4 is grounded, and the second terminal of the third filtering inductor L4 is connected to the negative terminal of the laser 20. The first terminal of the second filtering capacitor C7 is connected to the first terminal of the second filtering inductor L3, and the second terminal of the second filtering capacitor C7 is grounded. The first terminal of the third filtering capacitor C8 is connected to the second terminal of the second filtering inductor L3, and the second terminal of the third filtering capacitor C8 is connected to the second terminal of the third filtering inductor L4.

[0056] Figure 4 A schematic diagram of the structure of a laser device 40 according to an embodiment of this application is shown. For ease of explanation, only the parts relevant to this embodiment are shown, and are described in detail below:

[0057] A laser device 50 includes a laser 20 and a driving circuit 10 as described above, the driving circuit 10 being connected to the laser 20 and used to drive the laser 20 to operate.

[0058] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0059] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0060] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A driving circuit for driving a laser, characterized in that, include: A voltage regulation module, connected to the laser, is used to generate and adjust the driving voltage and driving current supplied to the laser based on the input voltage and a voltage regulation signal. The main control module is connected to the voltage regulation module and is used to output the voltage regulation signal; A voltage protection detection module is set at the output end of the voltage regulation module and connected to the main control module, and is used to provide a voltage feedback signal to the main control module based on the driving voltage. A current protection detection module is set at the output end of the voltage regulation module and connected to the main control module, and is used to provide a current feedback signal to the main control module based on the drive current. The main control module is also used to adjust the voltage regulation signal according to the voltage feedback signal and the current feedback signal, so that the driving voltage output by the voltage regulation module reaches the target voltage and the driving current reaches the target current.

2. The driving circuit as described in claim 1, characterized in that, The voltage regulation module includes a Boost unit, which is used to adjust the drive voltage and the drive current based on the input voltage and the voltage regulation signal.

3. The driving circuit as described in claim 2, characterized in that, The Boost unit includes a voltage regulating inductor, a voltage regulating switch, and a unidirectional conductor; The first end of the voltage regulating inductor is used to receive the input voltage. The second end of the voltage regulating inductor is connected to the first conducting end of the voltage regulating switch and the input end of the unidirectional conductor. The control end of the voltage regulating switch is connected to the main control module. The second conducting end of the voltage regulating switch is grounded. The output end of the unidirectional conductor is used to connect to the laser.

4. The driving circuit as described in claim 1, characterized in that, The voltage protection detection module includes a voltage divider unit, which is connected to the output terminal of the voltage regulation module and the main control module respectively. The voltage divider unit is used to divide the driving voltage at the output terminal of the voltage regulation module to provide a corresponding voltage feedback signal to the main control module based on the driving voltage.

5. The driving circuit as described in claim 4, characterized in that, The voltage divider unit includes a first voltage divider resistor and a second voltage divider resistor. The first end of the first voltage divider resistor is connected to the output end of the voltage regulating module. The second end of the first voltage divider resistor is connected to the main control module and the first end of the second voltage divider resistor, respectively. The second end of the second voltage divider resistor is grounded.

6. The driving circuit as described in claim 1, characterized in that, The current protection detection module includes a current limiting unit. The first end of the current limiting unit is connected to the output end of the voltage regulation module, the second end of the current limiting unit is used to connect to the laser, and both ends of the current limiting unit are connected to the main control module.

7. The driving circuit as described in claim 6, characterized in that, The current limiting unit includes several current limiting resistors.

8. The driving circuit as described in claim 1, characterized in that, The main control module includes a Boost chip, which is used to obtain the target voltage and the target current based on the configuration signal, and output the voltage regulation signal according to the target voltage, the target current, the voltage feedback signal and the current feedback signal.

9. The driving circuit as described in claim 1, characterized in that, It also includes an input filtering module and an output filtering module. The input filtering module is connected to the input terminal of the voltage regulation module, and the output filtering module is connected between the output terminal of the voltage regulation module and the laser.

10. A laser device, characterized in that, It includes a laser and a driving circuit as described in any one of claims 1 to 9, wherein the driving circuit is connected to the laser.

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