TWI628976B - High-power laser diode driving device and driving and control method thereof - Google Patents

Abstract

A high-power laser diode driving device comprising a safety circuit, a DC-DC converter Converter and a feedback controller. The feedback controller includes a voltage dividing circuit, a current-voltage converter, a signal amplifier, a current feedback controller and a PULSE WIDTH MODULATION (PWM) controller. The topology of the DC-DC converter adopts a Buck-Boost Converter to realize the operation of buck, boost, boost, and buck-boost, thereby converting the buck-boost voltage according to the voltage variation of the input power supply. The device operates in a boost or buck mode to convert the drive power required by the high power laser diode. The invention also discloses a driving and control method for a high power laser diode driving device to achieve the purpose of driving and controlling a high power laser diode.

Description

High-power laser diode driving device and driving and control method thereof

The invention relates to a high-power laser diode driving device and a driving and control method thereof, which are combined with a voltage feedback and current feedback controller by a DC-DC converter to drive a high-power laser diode Body and provide the drive power required for high power laser diodes.

On-Board Headlamps feature High-Beam, Low-Beam and Blink Light for driving on the road. Due to the continuous improvement of the process technology and reliability of optoelectronic semiconductors, optoelectronic semiconductors have been used in the low beam and direction indicators of automotive headlamps. Energy Saving, DC drive, and high brightness have been adopted. ) and Light-Emitting Diode (LED) with Excellent Color Rendering. Therefore, the new vehicles introduced by the car manufacturers have gradually replaced the traditional incandescent halogen bulbs with the light-emitting diodes.

When the driver is driving on a night road or passing through a dark place, in order to expand the visible range and brightness of the front of the driving, the high beam can be turned on for high beam illumination. The mainstream light source used in today's automotive high-end headlamps is a metal halide high-density gas discharge lamp (Metal Halide High-Intensity Discharge), which replaces the traditional incandescent halogen bulb; however, the complex metal halogen high-density gas discharge lamp itself has a negative Impedance, high voltage start and AC drive are equivalent, so they must be paired with an Electronic Ballast to provide a stable AC drive.

The laser diode is currently mainly used in medical, measurement and positioning applications; since the laser diode for the above uses is of low optical output power, it can be completed by using a low-power power converter. The purpose of the drive. However, as the technology of laser diodes continues to improve and evolve, and the demand for illumination such as high brightness and long-range projection increases, the electrical specifications of laser diodes have begun to move toward high drive currents, as well as high optics. Output power development. At present, European and Japanese car manufacturers have applied laser diodes to the automotive field and started to develop laser headlamps.

Light Amplification by Simulated Emission Radiation (Laser) is a kind of light generated by exciting scattered radiation to achieve light amplification. The existing laser oscillator structure can be classified into a solid-state laser, a gas laser, a fiber laser, and a semiconductor laser. When the laser diode is operated under forward bias, the emitted light can be increased by increasing its driving current; therefore, as the driving current increases, electrons in the n-type semiconductor are injected into the p-type semiconductor. And using the Wide Band Gap of the Hetero Isolation Junction, so that most of the electrons are confined within the p-type semiconductor; therefore, by means of carrier carrier condensation (Carrier Confinement) Increase the probability of population inversion, thereby increasing the Light Emission Intensity.

The laser diode has characteristics such as High Monochromaticity, High Directionality, High Coherence, and High Energy Density. At present, the automotive laser headlights developed by the European and Japanese car manufacturers use semiconductor lasers.

Chinese Patent No. CN105472834A discloses a lighting circuit and a vehicle lamp using the lighting circuit, which can suppress overcurrent of a driving current of a light source. The lighting circuit has an overcurrent protection (OCP) circuit, and detects a driving current of the light emitting component by a current sensor, and then inputs a comparator to compare with a driving current reference command, when the driving current of the light emitting component When the required current threshold is exceeded, the output level of the comparator can be changed, so that the transistor connected in series with the light source is turned off, and the driving power source of the light source is cut off.

The Republic of China Patent No. M469132 discloses a series-driven high-power laser device with circuit drive compensation. The device comprises a plurality of laser diodes connected in series, and respectively uses a complex array light intensity sensor to receive a laser from a corresponding complex laser diode and convert the laser signal into a voltage Signal. The device uses a controller to connect the light intensity sensors to receive voltage signals from the light intensity sensors, and after the interpretation, the controller can provide a compensation value for each of the laser diodes. And use this compensation value to modulate the temperature of the temperature controllers, so that the laser light output from each laser diode can be kept consistent.

The Republic of China Patent No. I223931 discloses an automatic power control circuit structure for an optical transceiver. The automatic power control circuit structure includes a light sensor for sensing the light of the laser diode and converting the light energy of the sensed laser diode into a photocurrent; an operational amplifier connected to be negative In the feedback mode, the output end is coupled to the laser diode, and the inverting input terminal of the operational amplifier is coupled to the photo sensor; the non-inverting input terminal of the operational amplifier is coupled to a reference voltage And a temperature compensation circuit coupled to one of the input terminals of the operational amplifier for changing one of the input voltages of the operational amplifier with temperature, thereby compensating and tracking the laser optical output power that is changed due to temperature.

The Republic of China Patent No. I473388 discloses a current compensation module, a charging device and a method of controlling the same. The current compensation module is used to control the charging current output to the battery module. The current compensation module includes an addition point, a transition unit, a proportional function control unit, and an integral function control unit. The transition unit increases the internal signal of the current compensation module from the first voltage value. When the voltage value of the internal signal rises to reach the second voltage value, the proportional function control unit starts to generate a proportional control signal to adjust the charging current output by the charging device. When the current value of the charging current reaches the rated current value, the integral function control unit is configured to generate a proportional integral control signal together with the proportional function control unit by the transition unit to output a charging current of a fixed current value. The control technology proposed in this case is mainly applied to the charging device of the battery pack, which can stabilize the charging current of the battery and eliminate the current surge during the starting period.

The optical output power of the laser diode is linearly proportional to its drive current. However, none of the above-described laser diode driving devices provide a current feedback control circuit for the driving current of the laser diode to compensate the driving current. Secondly, the laser diode driving device must have a fixed voltage output mode and a fixed current output mode to complete the laser diode starting and driving. When the laser diode driving device is switched from the fixed voltage output mode to the fixed current output mode at the initial stage of starting, a current surge is generated. However, whether in research papers or patent literature, this situation is rarely explored and improved by control strategies. Therefore, the inventors have not compensated for the driving current of the laser diode in order to maintain the stability of the driving current and the optical output power, and the polarization of the laser diode driving device in the fixed voltage output mode is fixed. Slow current drive mode Set the resulting current surge. For the sake of his position, the Applicant, in view of the lack of prior art, is the idea of improving innovation to improve the above-mentioned shortcomings. Therefore, an achievable high-power laser diode driving device and a driving and controlling method thereof are invented to solve the prior art.

The present inventors have actively developed the present invention in view of the fact that the prior art does not target the driving current of the laser diode, the compensation of the driving current, and the lack of improvement of the starting current surge, so as to improve the existing Disadvantages, after continuous experimentation and efforts, the present invention has finally been developed.

A first object of the present invention is to provide a driving device for a high power laser diode. A second object of the present invention is to provide a driving and control method for a laser diode driving device.

In order to achieve the above object, the driving device of the high power laser diode of the present invention comprises a Safety-Standard Circuit, a DC-DC Converter and a feedback controller. (Feedback Controller).

The feedback controller has a Voltage Divider, a Current-Voltage Converter, a Signal Amplifier, a Current Feedback Controller, and a pulse. PULSE WIDTH MODULATION (PWM) controller (PULSE WIDTH MODULATION, PWM) Controller.

The PULSE WIDTH MODULATION (PWM) controller has a Voltage Feedback Controller, a Soft-Start Module and a PULSE WIDTH MODULATION. PWM) module (PULSE WIDTH MODULATION (PWM) Module).

The power input connected to the high-power laser diode driving device is an in-vehicle battery in the present invention, but the invention is not limited to the input power supply form of the vehicle battery, and the output end of the high-power laser diode driving device Connecting a high power laser diode set comprising a plurality of high power laser diodes, the high power laser diode set of the invention is connected in series with three high power mines The diode is diode-shaped, but is not limited to its series-parallel form and series-parallel number.

The input end of the safety circuit is connected to the vehicle battery, and the output end is connected to the input end of the DC-DC converter.

The output of the DC-DC converter is coupled to the high power laser diode set.

The feedback controller has a first input, a second input, a third input and an output. The first input is connected to the positive voltage output of the DC-DC converter to detect its output voltage. The second input is connected to the negative voltage output end of the DC-DC converter, and the third input is connected to the cathode (Cathode) end of the high-power laser diode of the high-power laser diode group, the second input The terminal and the third input cooperate with a current-voltage converter inside the controller to detect the driving current of the high-power laser diode group.

The voltage dividing circuit of the feedback controller has an input end and an output end. The input end of the voltage dividing circuit is connected to the positive voltage output end of the DC-DC converter, and the output end of the voltage dividing circuit is connected to the first input end of the PULSE WIDTH MODULATION (PWM) controller. The voltage divider circuit can be used to obtain the output voltage of the DC-DC converter. After the voltage division, the voltage feedback controller in the PULSE WIDTH MODULATION (PWM) controller is input.

The current-voltage converter of the feedback controller has a first input, a second input and an output. The first input is connected to the negative voltage output of the DC-DC converter. The second input end is connected to the cathode end of the high power laser diode of the high power laser diode group, and the first input end and the second input can detect the driving current of the high power laser diode group And convert it into a voltage signal input signal amplifier. The output is connected to a signal amplifier.

The signal amplifier of the feedback controller has an input end and an output end. The input of the signal amplifier is connected to the output of the current-to-voltage converter, and the output of the signal amplifier is connected to the input of the current feedback controller. The purpose of the signal amplifier is to receive the voltage signal of the current-voltage converter, and amplify the voltage signal and input the current feedback controller.

Another object of the present invention is to provide a current feedback controller for variable control technology and to disclose current feedback controllers for the first and second variable control techniques.

In order to achieve the above object, the present invention discloses a current feedback controller of a first variable control technology, comprising a switch, a Proportional control module and a Proportional-Integral control module.

The invention discloses a current feedback controller of the second variable control technology, and further comprises a switch, a proportional differential-differential (PD) control module and a proportional integral control module.

The switch of the current feedback controller of the first variable control technology has a common contact, a first end point and a second end point. The common contact of the switch is connected to the output end of the signal amplifier, the first end is connected to the proportional control module of the current feedback controller, and the second contact is connected to the proportional integral control module of the current feedback controller.

The proportional control module has an input end and an output end. The input end of the proportional control module is connected to the first end of the switch, and the output end of the proportional control module is connected to the second input of the PULSE WIDTH MODULATION (PWM) controller.

The switch of the current feedback controller of the second variable control technology has a common contact, a first end point and a second end point. The common contact of the switch is connected to the output end of the signal amplifier, the first end is connected to the proportional differential control module of the current feedback controller, and the second contact is connected to the proportional integral control module of the current feedback controller.

The proportional differential control module has an input end and an output end. The input end of the proportional differential control module is connected to the first end of the switch, and the output of the proportional differential control module is connected to the second input of the PULSE WIDTH MODULATION (PWM) controller.

The proportional integral control module has an input end and an output end. The input end of the proportional integral control module is connected to the second end of the switch, and the output end of the proportional integral control module is connected to the second input end of the PULSE WIDTH MODULATION (PWM) controller.

The current feedback controller can be divided into the first stage, the second stage and the third stage in the initial stage of starting the high power laser diode driving device.

In the first stage of the initial start-up, the high-power laser diode drive is a flexible start and fixed voltage output mode, and the high-power laser diode drive is powered by a voltage feedback controller and flexible Controlled by the moving module. The flexible starting module can effectively suppress the output voltage surge of the high power laser diode driving device.

In the second stage of the initial start-up, the high-power laser diode driving device will be switched from the fixed voltage output mode to the fixed current output mode, and the high-power laser diode driving device is controlled by the current feedback controller; In the initial second stage current feedback controller, a proportional control module can be used, which can increase the transient control speed of the current feedback controller, thereby effectively slowing down the temporary generation generated by the high power laser diode driving device. State current surge.

Secondly, the second stage current feedback controller in the initial stage can use the proportional differential control module. Compared with the proportional control module, the transient response speed of the current feedback controller is faster, so the high power laser is suppressed. The transient current surge generated by the diode drive device is more effective.

In the third stage of the initial start-up, the high-power laser diode drive enters the fixed current output mode operation, so the current feedback controller uses the proportional-integral control module, thereby reducing the high-power laser II under steady-state operation. The steady-state error of the pole drive current provides the steady-state drive current required for the high-power laser diode.

In order to achieve the above object, the driving and control method of the high-power laser diode driving device of the present invention comprises the following steps: Step A: providing a high-power laser diode driving device, the high-power laser device The polar body driving device has a safety circuit, a DC-DC converter and a feedback controller. The feedback controller includes a voltage dividing circuit, a current-voltage converter, a signal amplifier, and a current feedback control. And a PULSE WIDTH MODULATION (PWM) controller including a voltage feedback controller, a flexible start module and a pulse width modulation PULSE WIDTH MODULATION (PWM) module; the current feedback controller can adopt a first variable control technology, using a switch, a proportional control module and a proportional integral control module; the current feedback controller adopts a second variable control technique using a switch, a proportional differential control module, and a proportional integral control module; Step B: generating a driving voltage and a driving current of at least one high-power laser diode by using the high-power laser diode driving device; Step C: measuring the voltage dividing circuit of the feedback controller The driving voltages of the high-power laser diodes are input to the voltage feedback controller inside the PULSE WIDTH MODULATION (PWM) controller after the voltage division; Step D: using the pulse width modulation PULSE WIDTH MODULATION (PWM) controller internal voltage feedback controller to generate voltage error command to control pulse width modulation (PULSE WIDTH MODULATION) inside PULSE WIDTH MODULATION (PWM) controller , PWM) module, modulation pulse width modulation (PULSE WIDTH MODULATION, PWM) drive signal, and then control the output voltage of the DC-DC converter to complete the purpose of controlling the high-power laser diode driving voltage; Step E Using the current-voltage converter of the feedback controller, measuring the driving current of the high-power laser diode, and converting the measured current into a voltage signal; Step F: using the feedback control a signal amplifier receives the voltage signal converted by the current-voltage converter and amplifies the voltage signal; Step G: a voltage signal output from the signal amplifier is input to the current feedback controller, and a proportional integral control technique is used to generate a current Error command; Step H: The current error command is input to the PULSE WIDTH MODULATION (PWM) controller to control the PULSE WIDTH MODULATION (PWM) module modulation pulse width modulation (PULSE WIDTH) MODULATION, PWM) drive signal, and then control the output current of the DC-DC converter to complete the control of high-power laser diode driving current; Step I: in the early stage of high-power laser diode startup, borrow The PULSE WIDTH MODULATION (PWM) module and the PULSE WIDTH MODULATION (PWM) driving signal are controlled by the flexible starting module, thereby outputting the output voltage of the DC-DC converter. The ramp-up reaches the starting voltage of the high-power laser diode to complete the flexible start, thereby avoiding voltage surges.

The driving and control method of the high-power laser diode driving device of the present invention further includes the step J: in the initial stage of starting, and when the fixed voltage output mode is changed to the fixed current output mode, the current is returned. The controller uses the technique of proportional control switching proportional integral control. When the current feedback controller is proportionally controlled, the transient response time of the current feedback controller can be increased, thereby effectively slowing down the high power laser. The current surge output by the polar body drive device.

The driving and control method of the high-power laser diode driving device of the present invention further includes the second embodiment: step K: the current feedback controller can use the proportional differential control switching proportional integral control technology, compared with the adoption The proportional control module and the current feedback controller have a faster transient response speed, so the transient current surge generated by the high-power laser diode driving device is suppressed, and the effect is more remarkable.

Step L: When the device enters the fixed current output mode operation, the current feedback controller switches to proportional integral control, thereby providing the low frequency gain and phase margin required for steady state operation, thereby stabilizing the high power laser. The driving current of the diode.

(1)‧‧‧High power laser diode drive

(10) ‧‧‧ Safety Circuit

(11)‧‧‧DC-DC converter

(111) ‧‧‧ Positive voltage output of DC-DC converter

(112) ‧‧‧Negative voltage output of DC-DC converter

(12)‧‧‧Responsible controller

(1200) ‧ ‧ back to the first input of the controller

(1212) ‧‧ ‧ feedback controller second input

(1213) ‧‧ ‧ the third input of the feedback controller

(120) ‧‧‧voltage circuit

(121)‧‧‧ Current-to-Voltage Converter

(12120) ‧‧ The first input of the current-to-voltage converter

(12130) ‧‧ ‧ the second input of the current-to-voltage converter

(1211)‧‧‧ Output of current-voltage converter

(122)‧‧‧Signal Amplifier

(123‧‧‧current feedback controller

(1230) ‧ ‧ switch

(1231)‧‧‧Proportional Control Module

(1232)‧‧‧Proportional integral control module

(1233)‧‧‧Proportional Differential Control Module

(124)‧‧‧Pulse width modulation (PULSE WIDTH MODULATION, PWM) controller

(1240) ‧‧‧Voltage feedback controller

(1241)‧‧‧Flexible Starter Module

(1242)‧‧‧Pulse width modulation (PULSE WIDTH MODULATION, PWM) module

(1243) ‧‧‧Phase width modulation (PULSE WIDTH MODULATION, PWM) module first input

(1244) ‧‧‧Second input of the PULSE WIDTH MODULATION (PWM) module

(1245) ‧‧‧Pulse width modulation (PULSE WIDTH MODULATION, PWM) module output (pulse Width modulation (PULSE WIDTH MODULATION, PWM) drive signal)

(2) Driving and control method for ‧‧‧ laser diode driving device

200‧‧‧ steps

201‧‧‧Steps

202‧‧‧Steps

203‧‧‧Steps

204‧‧‧Steps

205‧‧‧Steps

206‧‧‧Steps

207‧‧‧Steps

208‧‧‧Steps

209‧‧‧Steps

210‧‧‧Steps

(3)‧‧‧Car battery

(4) ‧‧‧High power laser diode group

(41) ‧‧‧The high-power laser diode group, the cathode end of one of the high-power laser diodes

(p1) ‧ ‧ switch first position

(p2) ‧ ‧ switch second position

1 is a system architecture diagram of a high power laser diode driving device of the present invention; FIG. 2 is a circuit block diagram of a feedback controller of a general high power laser diode driving device; The high-power laser diode driving device is matched with the output voltage and current of the feedback controller; FIG. 4 is a circuit block of the first embodiment of the feedback controller of the high-power laser diode driving device of the present invention. Figure 5 is a circuit block diagram of a second embodiment of a feedback controller for a high power laser diode driving device of the present invention; Figure 6 is a high power laser diode driving device of the present invention. Schematic diagram of the output voltage and current of the first and second embodiments of the feedback controller; FIG. 7 is a flow chart showing the steps of the driving and controlling method of the high power laser diode driving device of the present invention; 8 is a flow chart showing the steps of the first embodiment of the driving and controlling method for the high power laser diode driving device of the present invention; and FIG. 9 is the driving of the high power laser diode driving device of the present invention. A flow chart of the steps of the second embodiment of the control method.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the present invention will be described in detail below with reference to the drawings.

Referring to FIG. 1, the high-power laser diode driving device (1) of the present invention is connected to a high-power laser diode group at the output end of the high-power laser diode driving device (1). (4) The high power laser diode group (4) comprises a plurality of high power laser diodes, wherein the high power laser diode driving device (1) comprises a safety circuit (10), A DC-DC converter (11) and a feedback controller (12).

In an embodiment of the invention, the defined high power laser diode has an electrical operating power greater than 1 watt, although the invention is not limited to laser diodes employing other power.

The input end of the safety circuit (10) is connected to a vehicle battery (3).

The DC-DC converter (11) is connected to an output end of the safety circuit (10), and an output end of the DC-DC converter (11) is connected to the high power laser diode group (4). The topology of the DC-DC converter (11) uses a buck-boost converter to operate the buck, boost, boost, and buck-boost, thereby allowing the buck-boost converter to operate in response to voltage variations in the input supply. The boost or buck mode converts the drive power required by the high power laser diode set (4).

Referring to FIG. 1 , the feedback controller (12) has a first input terminal (1200), a second input terminal (1212), a third input terminal (1213) terminal, and an output terminal (1245). The first input terminal (1200) is connected to the positive voltage output terminal (111) of the DC-DC converter (11) to detect the output voltage thereof, and the second input terminal (1212) is connected to the DC-DC converter (11). A negative voltage output terminal (112), the third input terminal (1213) is connected to the cathode end (41) of the high power laser diode set (4) of the high power laser diode. Referring to FIG. 2, the feedback controller (12) includes a voltage dividing circuit (120) and a current-voltage converter. (121), a signal amplifier (122), a current feedback controller (123), and a PULSE WIDTH MODULATION (PWM) controller (124).

The voltage dividing circuit (120) has an input end and an output end, and the input end of the voltage dividing circuit (120) is the first input end (1200) of the feedback controller (12), the sub The input end of the voltage circuit (120) is connected to the positive voltage output terminal (111) of the DC-DC converter (11).

The current-to-voltage converter (121) has a first input terminal (12120), a second input terminal (12130) and an output terminal (1211). The first input terminal (12120) of the current-voltage converter (121) Is the second input terminal (1212) of the feedback controller (12), and the first input terminal (1212) of the current-voltage converter (121) is connected to the negative of the DC-DC converter (11) a voltage output terminal (112); the second input terminal (12130) of the current-voltage converter (121) is a third input terminal (1213) of the feedback controller (12), the current-voltage converter The second input end (1213) of the (121) is connected to the cathode end (41) of the high power laser diode set (4) of the high power laser diode, and the current-voltage converter (121) The first input terminal (1212) and the second input terminal (1213) detect a driving current of the high power laser diode group (4) and convert it into a voltage signal.

The signal amplifier (122) has an input end and an output end. The input end of the signal amplifier (122) is connected to the output end (1211) of the current-voltage converter (121), and the signal amplifier (122) receives the signal amplifier (122). The voltage signal generated by the current-to-voltage converter (121) amplifies the voltage signal.

The current feedback controller (123) has an input end and an output end. The input end of the current feedback controller (123) is connected to the output end of the signal amplifier (122), and receives the signal amplifier (122). Amplified voltage signal; when the high-power laser diode driver (1) is in the fixed current output mode, the proportional-integral control technique is used to provide the low-frequency gain and phase margin required for the driver of the high-power laser diode. The driving current of the high power laser diode group (4) is stabilized.

The PULSE WIDTH MODULATION (PWM) controller (124) internally has a voltage feedback controller (1240), a flexible start module (1241) and a PULSE WIDTH MODULATION (PWM). a module (1242), the first input end (1243) of the PULSE WIDTH MODULATION (PWM) controller (124) is connected to an output end of the voltage dividing circuit (120), and the voltage dividing circuit is utilized (120) obtaining the output voltage V _{o of} the DC-DC converter (11), and inputting the voltage feedback controller in the PULSE WIDTH MODULATION (PWM) controller (124) after dividing the voltage (1240).

The power input connected to the high-power laser diode driving device (1) is an on-board battery (3), and the output end of the high-power laser diode driving device (1) is connected to the high-power laser Diode group (4).

Referring to FIG. 2 and FIG. 3, under steady state operation, the voltage feedback controller (1240) and the current feedback controller (123) can satisfy the high power laser diode by using proportional integral control technology. The body drive (1) outputs the required stability under steady state operation and reduces the steady state error of the high power laser diode drive power supply. However, the high-power laser diode driving device (1) uses the flexible starting module (1241) to prevent the transient voltage surge from damaging the high-power laser diode at the initial stage of startup. The output voltage of the high power laser diode drive (1) to reach the starting voltage V _st required for the high power laser diode set (4). Secondly, when the output of the high-power laser diode driving device (1) is converted from a fixed voltage output to a fixed current output, the flexible starting technique cannot suppress the transient current surge I _ovcp ; and I _ovcp exceeds the high power. The rated specification of the laser diode driving current will cause the operating life of the high-power laser diode group (4) to gradually decrease or even be damaged.

Referring to FIG. 1, FIG. 4 and FIG. 6, in the first embodiment of the current feedback controller (123) of the present invention, the current feedback controller (123) has the function of a variable control technique. The system includes a switch (1230), a proportional control module (1231) and a proportional integral control module (1232).

Referring to FIG. 1, FIG. 5 and FIG. 6, in the second embodiment of the current feedback controller (123) of the present invention, the current feedback controller (123) has the function of a variable control technique. The system includes a switch (1230), a proportional differential control module (1233) and a proportional integral control module (1232).

Referring to FIG. 4 and FIG. 5, the switch (1230) has a common contact, a first end point (p1) and a second end point (p2), and the common contact of the switch (1230) is connected to the signal amplifier ( 122) The output.

The proportional control module (1231) has an input end and an output end. The input end of the proportional control module (1231) is connected to the first end point (p1) of the switch (1230), and the proportional control module (1231) Loss The output is coupled to a second input (1244) of the PULSE WIDTH MODULATION (PWM) controller (124).

Referring to FIG. 5, in another embodiment of the present invention, the proportional differential control module (1233) has an input end and an output end, and the input end of the proportional differential control module (1233) is connected to the switch. a first end (p1) of the (1230), the output of the proportional differential control module (1233) is coupled to the second input of the PULSE WIDTH MODULATION (PWM) controller (124) (1244) .

The proportional integral control module (1232) has an input end and an output end, and an input end of the proportional integral control module (1232) is connected to a second end point (p2) of the switch (1230), the proportional integral control mode The output of the group (1232) is coupled to the second input (1244) of the PULSE WIDTH MODULATION (PWM) controller (124).

Referring to FIG. 1, FIG. 2, FIG. 4, FIG. 5 and FIG. 6, the current feedback controller (123) can be divided into the initial stage of the high-power laser diode driving device (1). The first phase, the second phase and the third phase.

In the first stage of the initial start, the high power laser diode driving device (1) is controlled by the voltage feedback controller (1240) and the flexible starting module (1241).

In the second stage of the initial stage of starting, the high-power laser diode driving device (1) is switched from a fixed voltage output mode to a fixed current output mode, and the high-power laser diode driving device (1) is The current feedback controller (123) controls the second stage, and the current feedback controller (123) uses a proportional control module (1231) to increase the transient response speed of the current feedback controller (123). Thereby, the transient current surge of the output of the high-power laser diode driving device (1) can be effectively slowed down.

In the second stage of the initial stage of the start-up, the current feedback controller (123) uses a proportional differential control module (1233), and the transient control speed of the current feedback controller (123) is more advanced than that of the proportional control module. It is fast, so the transient current surge generated by the high-power laser diode driving device is suppressed, and the effect is more remarkable.

In the third stage of the initial start, the high power laser diode driving device (1) enters the fixed current output mode operation, so the current feedback controller (123) uses the proportional integral control module (1232) to borrow This reduces the steady-state error of the high power laser diode drive current under steady state operation.

In an embodiment of the invention, the PULSE WIDTH MODULATION (PWM) controller (124) can be implemented by a discrete (PULSE WIDTH MODULATION, PWM) integrated circuit. .

In an embodiment of the invention, the PULSE WIDTH MODULATION (PWM) controller (124) can be implemented by a PULSE WIDTH MODULATION (PWM) control.

Referring to FIG. 2, FIG. 4 and FIG. 5, in the embodiment of the present invention, the current feedback controller (123) can be implemented by an analog control.

In an embodiment of the invention, the current feedback controller (123) can be implemented by a digital control.

Referring to FIG. 1, FIG. 2, FIG. 3 and FIG. 7, the driving and control method (2) of the general high-power laser diode driving device comprises the following steps: Step 200: providing a high-power laser a diode driving device (1), the high power laser diode driving device (1) has a safety circuit (10), a DC-DC converter (11) and a feedback controller (12), The feedback controller (12) includes a voltage dividing circuit (120), a current-voltage converter (121), a signal amplifier (122), a current feedback controller (123), and a pulse width modulation ( PULSE WIDTH MODULATION (PWM) controller (124); the PULSE WIDTH MODULATION (PWM) controller (124) includes a voltage feedback controller (1240), a flexible start module (1241) and A pulse width modulation (PULSE WIDTH MODULATION, PWM) module (1242); Step 201: using the high power laser diode driving device (1) to generate a driving voltage required for a high power laser diode With a drive current; Step 202: Measure the driving voltage of the high-power laser diode by using the voltage dividing circuit (120) of the feedback controller (12), and input the pulse width modulation after the voltage division (PULSE WIDTH) MODULATION, PWM) controller (124) internal voltage feedback controller (1240); step 203: using the pulse width modulation (PULSE WIDTH MODULATION, PWM) controller (124) internal voltage feedback controller (1240) ), to generate a voltage error command, thereby controlling the PULSE WIDTH MODULATION (PWM) controller (1242), the modulation pulse width modulation (PULSE WIDTH MODULATION, PWM) controller (1242), the modulation pulse A PULSE WIDTH MODULATION (PWM) drive signal (1245), which in turn controls the output voltage of the DC-DC converter (11) to complete the control of the high power laser diode drive voltage; Step 204: utilize The current-voltage converter (121) of the feedback controller (12) measures the driving current of the high-power laser diode and converts the measured current into a voltage signal; Step 205: utilize the back A signal amplifier (122) of the controller (12) is received to receive the current-voltage conversion (121) the converted voltage signal and amplifying the voltage signal; step 206: the voltage signal output by the signal amplifier (122) is input to the current feedback controller (123), using a proportional integral control technique to generate a current error command Step 207: The current error command is input to the PULSE WIDTH MODULATION (PWM) controller (124), and the PULSE WIDTH MODULATION (PWM) module (1242) is modulated to adjust the pulse width modulation. The PULSE WIDTH MODULATION (PWM) drive signal (1245), thereby controlling the output current of the DC-DC converter (11) to complete the control of the high power laser diode drive current; Step 208: At high power In the initial stage of the laser diode, the PULSE WIDTH MODULATION (PWM) module (1242) is controlled by the flexible start module (1241), and the PULSE WIDTH MODULATION (PWM) is modulated. The driving signal is used to cause the output voltage of the DC-DC converter (11) to rise to the starting voltage of the high-power laser diode to complete the flexible starting, thereby avoiding voltage surge generation.

Referring to FIG. 1, FIG. 4, FIG. 6, and FIG. 8, in the first embodiment of the current feedback controller (123) of the present invention, the driving of the high power laser diode driving device of the present invention is Control method (2), such as step 209: in the initial stage of high-power laser diode startup, when the high-power laser diode driving device is switched from the fixed voltage output mode to the fixed current output mode, the current feedback controller (123) Using proportional control to switch to proportional integral control technology, when the current feedback controller (123) adopts proportional control, the transient response speed of the current feedback controller (123) is increased, thereby effectively slowing down The current surge generated by the high power laser diode driving device (1); when the high power laser diode driving device (1) enters the fixed current output mode operation, the current feedback controller (123) is used Proportional integral control technology, which provides the required low frequency gain and phase margin for fixed current output mode operation, thereby stabilizing the drive current of the high power laser diode.

Referring to FIG. 1, FIG. 5, FIG. 6, and FIG. 9, in the second embodiment of the current feedback controller (123) of the present invention, the driving of the high power laser diode driving device of the present invention is Control method (2), such as step 210: in the initial stage of high-power laser diode startup, when the high-power laser diode driving device is switched from the fixed voltage output mode to the fixed current output mode, the current feedback controller (123) Using proportional differential control to switch to proportional integral control technology, when the current feedback controller (123) adopts proportional differential control, increasing the transient response speed of the current feedback controller (123) can also be effective. Slowing the current surge generated by the high-power laser diode driving device (1); when the high-power laser diode driving device (1) enters the fixed current output mode operation, the current feedback controller (123) Proportional integral control technology is used to provide the required low frequency gain and phase margin for fixed current output mode operation, thereby stabilizing the drive current of the high power laser diode.

In an embodiment of the invention, the PULSE WIDTH MODULATION (PWM) controller (124) can be implemented by a separate PULSE WIDTH MODULATION (PWM) integrated circuit.

In an embodiment of the invention, the PULSE WIDTH MODULATION (PWM) controller (124) can be implemented by a PULSE WIDTH MODULATION (PWM) control.

Referring to FIG. 2, FIG. 4 and FIG. 5, in the embodiment of the present invention, the current feedback controller (123) can be implemented by an analog control.

In an embodiment of the invention, the current feedback controller (123) can be implemented by a digital control.

The difference between the present invention and the Republic of China Patent No. I473388 is as follows: First, the load of the present invention is a high power laser diode, and the load of the Republic of China Patent No. I473388 is a battery pack. Second, when performing feedback control analysis, the high-power laser diode of the present invention can be regarded as a resistive load, and the Republic of China Patent No. I473388 should be regarded as a capacitive load; The driving device and its driving and controlling method can be applied to the starting and driving of the high-power laser diode, and can suppress the transient current surge at the time of starting. Thirdly, the present invention utilizes the proportional control switching proportional integral control technology to complete the startup transient current surge suppression of the high power laser diode and the purpose of the steady state drive current control, and thus is different from the Republic of China Patent No. I473388. Apply to the battery charger. Fourthly, the present invention further proposes a proportional-integral control switching proportional-integral control technique, which can also achieve transient current surge suppression of high-power laser diodes, and the purpose of steady-state driving current control, and suppress transient currents. The effect of the glitch is better than the proportional control switching proportional integral control technique.

The present invention is not easily understood by those skilled in the art, and is novel and progressive. Through the above detailed description, it fully demonstrates that the object and effect of the present invention are both progressive in implementation, highly industrially usable, and are new inventions not previously seen on the market, and fully comply with the invention patent requirements. Apply in accordance with the law. The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the invention. All changes and modifications made in accordance with the scope of the invention shall fall within the scope covered by the patent of the invention. I would like to ask your review committee to give a clear explanation and pray for it.

Claims (10)

A high-power laser diode driving device, the output end of the high-power laser diode driving device is connected to a high-power laser diode group, the high-power laser diode group includes a plurality of high-power groups a laser diode, the high power laser diode driving device comprises: a safety circuit, the input end of which is connected to a vehicle battery; the DC-DC converter is connected to the output end of the safety circuit, The output end of the DC-DC converter is connected to the high-power laser diode group, and the topology of the DC-DC converter adopts a buck-boost converter to implement buck, boost, boost, and buck-boost Operating, in response to a voltage change of the input power source, causing the buck-boost converter to operate in a step-up or step-down mode, thereby converting the driving power required by the high-power laser diode group; and a feedback controller, Having a first input end, a second input end, a third input end and an output end, the first input end is connected to a positive voltage output end of the DC-DC converter to detect an output voltage thereof, the second input end Connect DC-DC conversion a negative voltage output end, the third input end is connected to a cathode end of a high power laser diode of the high power laser diode group, and the second input end cooperates with the third input end of the feedback control a voltage-current converter inside the device for detecting a driving current of the high-power laser diode group, the feedback controller comprising: a voltage dividing circuit having an input end and an output end, the partial voltage The input end of the circuit is connected to the positive output end of the DC-DC converter; a current-voltage converter has a first input end, a second input end and an output end, and the first input end is connected to the DC-DC a negative voltage output end of the converter, the second input end is connected to a cathode end of one of the high power laser diode groups, and the first input end cooperates with the second input end The second input end and the third input end of the controller are configured to detect a driving current of the high power laser diode group and convert it into a voltage signal; a signal amplifier having an input end and an output end, The input of the signal amplifier is connected to the current-voltage Converter output terminal of the signal amplifier receives current - output voltage signal of the voltage converter, and amplifying the voltage signal; A current feedback controller has an input terminal connected to the output end of the signal amplifier, receives an output voltage signal of the signal amplifier, and uses proportional control switching proportional integral control technology to allow the driver to transition to a fixed current output in a fixed voltage output mode. In the mode, the transient current surge at the start is effectively reduced to ensure that the high-power laser diode group can be started under the rated electrical specifications to avoid damage caused by the overcurrent drive; the current feedback controller uses Proportional differential control switching proportional integral control technology, compared with the proportional control switching proportional integral control technology, the current feedback controller's transient response control speed is faster, so suppress the high power laser diode drive device Transient current surge, the effect is more significant; and a PULSE WIDTH MODULATION (PWM) controller, including a voltage feedback controller, a flexible start module and a pulse width modulation (PWM) module a first input end of the pulse width modulation (PWM) controller is connected to an output end of the voltage dividing circuit, and the voltage dividing circuit is utilized You can obtain the DC - DC output voltage of the converter, after dividing the input via the pulse width modulation (PWM) controller within the feedback voltage controller. The driving device of the high power laser diode according to the first aspect of the invention, wherein the current feedback controller of the variable control technology further comprises: a switch having a common contact, a first end point and a first a second terminal, the common contact of the switch is connected to the output end of the signal amplifier; a proportional control module has an input end and an output end, and the input end of the proportional control module is connected to the first end of the switch, An output end of the proportional control module is connected to the second input end of the pulse width modulation (PWM) controller; and a proportional integral control module has an input end and an output end, and the input end of the proportional integral control module Connecting the second end of the switch, the output of the proportional integral control module is connected to the second input of the pulse width modulation (PWM) controller; the current feedback controller is at the high power laser diode The initial stage of the driving device can be divided into the first stage, the second stage and the third stage; The first stage of the high power laser diode driving device is a fixed voltage output and a flexible starting mode, and the laser diode driving device is controlled by the voltage feedback controller and the flexible starting module; in the second stage, The laser diode driving device is switched from a fixed voltage output mode to a fixed current output mode, the laser diode driving device is controlled by the current feedback controller; and the second phase is used by the current feedback controller The proportional control module can increase the transient control speed of the current feedback controller, thereby effectively reducing the transient current surge of the output of the laser diode driving device; in the third stage, the high power The laser diode driving device enters the fixed current output mode operation, so the current feedback controller uses the proportional integral control module, thereby reducing the steady state error of the high power laser diode driving current under steady state operation. . The driving device of the high power laser diode according to the first aspect of the invention, wherein the current feedback controller of the variable control technology further comprises: a switch having a common contact, a first end point and a first The two terminals, the common contact of the switch is connected to the output end of the signal amplifier; the proportional differential control module has an input end and an output end, and the input end of the proportional control module is connected to the first end of the switch, The output of the proportional differential control module is connected to the second input end of the pulse width modulation (PWM) controller; a proportional integral control module has an input end and an output end, and the input of the proportional integral control module The second end of the switch is connected to the second end of the pulse width modulation (PWM) controller; the current feedback controller is at the high power laser diode The initial stage of the body drive device can be divided into a first stage, a second stage and a third stage; in the first stage, the high power laser diode driving device is a fixed voltage output and a flexible starting mode, the laser diode Body drive The voltage feedback controller and the flexible start module are controlled by the voltage feedback controller; in the second stage, the current feedback controller can use the proportional differential control module, a current feedback controller, and the proportional differential control switching proportional integral control technology Compared with the proportional control switching ratio In the case of the integral control technology, the transient response of the current feedback controller is faster, so the transient current surge generated by the high-power laser diode driving device is suppressed, and the effect is more remarkable; in the third stage, The high-power laser diode driving device enters the fixed current output mode operation, so the current feedback controller uses the proportional-integral control module, thereby reducing the stability of the high-power laser diode driving current under steady-state operation. State error. The high power laser diode driving device according to claim 1 or 2 or 3, wherein the current feedback controller is implemented by an analog circuit or a digital control. The width modulation (PWM) controller is implemented by a separate pulse width modulation (PWM) integrated circuit or a digital pulse width modulation (PWM) control. A driving and control method for a high-power laser diode driving device includes the following steps: Step A: providing a high-power laser diode driving device, the high-power laser diode driving device has a safety circuit, A DC-DC converter and a feedback controller including a voltage dividing circuit, a current-voltage converter, a signal amplifier, a current feedback controller, and a pulse width modulation (PULSE) WIDTH MODULATION, PWM) controller, the pulse width modulation (PWM) controller comprises a voltage feedback controller, a flexible starting module and a pulse width modulation (PWM) module; step B: utilizing the height The power laser diode driving device generates one driving voltage and one driving current required for a high power laser diode; Step C: measuring the high power lightning by using a voltage dividing circuit of the feedback controller The driving voltage of the diode is input, and after the voltage division, the voltage feedback controller inside the pulse width modulation (PWM) controller is input; Step D: using the pulse width modulation (PWM) voltage inside the controller Feedback controller to generate electricity An error command for controlling a pulse width modulation (PWM) module inside the pulse width modulation (PWM) controller, modulating a pulse width modulation (PWM) driving signal, and thereby controlling an output of the DC-DC converter Voltage for completing the control of the high-power laser diode driving voltage; Step E: measuring the driving current of the high-power laser diode by using the current-voltage converter of the feedback controller, and The measured current is converted into a voltage signal; Step F: using the signal amplifier of the feedback controller, receiving the voltage signal converted by the current-voltage converter, and amplifying the voltage signal; Step G: inputting the voltage signal of the signal amplifier to the current feedback controller, utilizing Proportional integral control technique to generate a current error command; Step H: the current error command is input to the pulse width modulation (PWM) controller to control the pulse width modulation (PWM) module modulation pulse width modulation PWM) Driving the signal, thereby controlling the output current of the DC-DC converter to complete the control of the high-power laser diode driving current; and Step I: in the initial stage of the high-power laser diode, by the flexible start The module controls the pulse width modulation (PWM) module to modulate a pulse width modulation (PWM) driving signal, thereby causing the output voltage of the DC-DC converter to rise slowly to reach the start of the high power laser diode Voltage to complete the flexible start, thereby avoiding voltage surges. The method for driving and controlling a high-power laser diode driving device according to claim 5, wherein the current feedback controller comprises a switch, a proportional control module and a proportional integral control module. The driving and control method of the high-power laser diode driving device further comprises a step J: in the initial stage of high-power laser diode driving, the high-power laser diode driving device is changed from a fixed voltage output mode to a fixed current In the output mode, the current feedback controller uses the proportional control to switch to the proportional integral control technology. When the current feedback controller adopts the proportional control, the transient response speed of the current feedback controller is increased, thereby being effective. Slowing the current surge generated by the high power laser diode drive. The driving and control method of the high power laser diode driving device according to claim 5, wherein the current feedback controller comprises a switch, a proportional differential control module and a proportional integral control module The driving and control method of the high-power laser diode driving device further comprises a step K: in the initial stage of the high-power laser diode driving, the high-power laser diode driving device is switched from the fixed voltage output mode to In the fixed current output mode, the current feedback controller uses proportional differential control to switch to proportional integral control technology. When the current feedback controller uses proportional differential control, the fast current is increased. The transient feedback speed of the feedback controller is suppressed, so that the transient current surge generated by the high-power laser diode driving device is suppressed, and the effect is more remarkable. The driving and control method of the high-power laser diode driving device described in claim 5 or 6 or 7 after the high-power laser diode driving device enters the fixed current output mode operation The current feedback controller uses a proportional-integral control technique to provide the required low-frequency gain and phase margins in steady-state operation in a fixed current output mode to stabilize the drive current of the high-power laser diode. . The method for driving and controlling a high power laser diode driving device according to the fifth or sixth or seventh aspect of the patent application, wherein the pulse width modulation (PWM) controller is separated by a A pulse width modulation (PWM) integrated circuit or a digital pulse width modulation (PWM) control is implemented. The driving and control method of the high power laser diode driving device according to claim 5 or 6 or 7 wherein the current feedback controller is controlled by analog control or digital control to realise.