TWI691133B - A power system for three-wavelength high-optical-output-power laser diodes with its driving method - Google Patents

Abstract

This invention relates to a power system for three-wavelength high-optical-output-power laser diodes. The power system is a two-stage power converter, which composes of an interleaved power factor correction and a resonant converter; therefore, the operation for a universal AC power source and the driving of a high-optical-output-power laser diode can be achieved. Using the resonant-tank circuit and full-wave rectifier, the sinusoidal voltage can become a full-wave rectification voltage to drive laser diodes. When the full-wave rectification voltage can be higher than the forward-bias of the laser diode, a narrow pulse driving current (about 1μs) can be generated. Using the proposed system and method, it is possible that three-wavelength laser diode can be driven without the need for other modulation and control techniques, and a narrow pulse laser can be emitted.

Description

Three-wavelength high optical output power laser diode power supply system and driving method thereof

The invention is a three-wavelength laser output power system with high optical output power and a driving method thereof, in particular to a combination of power factor corrector and resonant converter to complete the operation of AC universal input power supply range and high optical output power The laser diode is driven to produce a narrow pulse laser.

According to the general knowledge of the high power efficiency laser diode drive circuit, please refer to the previous case 1, China applied for the invention patent No. 103134437 "High Power Efficiency Laser Diode Drive Circuit and Method", which revealed: Selectively turn on and off the voltage mode laser diode driver of the laser diode. The output stage has an output node configured to be connected to one of the laser diode endpoints. According to an embodiment, the active swing controller drives the output stage in a manner that substantially prevents inductive kickback from causing the output node voltage to swing beyond the voltage level at the power supply voltage output or swing below ground. The output stage provides a discharge path around the laser diode to shunt the current associated with the inductor kickback, and virtually eliminates the ringing effect on the output node of the output stage when the laser diode is off. The power supply controller adjusts the voltage level of the power supply voltage output so that when the laser diode is turned on and emits light, the current through the laser diode is substantially equal to the predetermined required current.

However, this case is compared with the previous case 1, which did not mention the use of interleaved power factor corrector and resonant converter to complete the laser diode drive. Secondly, the previous case 1 does not mention that this case uses a resonant tank circuit with the peak voltage of the sine wave generated by the full-wave rectifier to drive the laser diode. Furthermore, the previous case 1 also does not mention the integration of laser beams and the method of generating narrow pulse lasers.

Please refer to the previous case 2 again, the invention patent I644493 of the Republic of China discloses a laser diode drive system that receives the current of a power source to drive the operation of the laser diode. The laser diode drive system includes a control command Unit, a digital control unit, a switch-type DC-DC converter unit, a latch current control unit, a switch control unit, a laser diode unit, the invention is realized by the integration of power electronics and digital control technology Laser diode driven advanced control features such as high efficiency, high stability, real-time programmable fast (microsecond level) switching, and precise latch current regulation required by the above rapid switching process.

However, this case is compared with the previous case 2, which did not mention the use of interleaved power factor corrector and resonant converter to complete the laser diode drive. Secondly, although the previous case 2 mentioned driving the laser diode with a narrow pulse current, the technology used and the resonant tank circuit mentioned in this case, together with the peak voltage of the sine wave generated by the full-wave rectifier, drive the laser diode Body, its driving method is completely different from the circuit structure. Moreover, the narrow pulse defined in the previous case 2 refers to the rise time of the positive edge of the waveform; and the narrow pulse defined in this case refers to the half-cycle time of a sine wave, so the narrow pulse time in this case is much shorter than in the previous case 2. Furthermore, the previous case 2 also does not mention the method of combining multiple laser beams.

Please refer to the previous case 3, US invention patent US2011/0085576A1 "SMARTLINEAR PULSED LASER DODE DRIVER, AND METHOD", which reveals that in the pulsed laser diode driver, the energy storage capacitor is continuously charged to the power supply voltage Vr . When the pulse starts, the energy stored in the capacitor is transferred to the laser diode load. The capacitor voltage Vd at the end of the pulse is used to control Vr to ensure that Vd remains just above the minimum voltage Vm required for the operation of the saturated current control device (eg FET) to ensure that test pulses (eg with attenuation) can be emitted Current or reduced pulse width) and determine the initial optimal value of Vr . After the test pulse, a slightly higher Vr estimate can be used and can be iterated (increased) to the optimal value Vm during the ignition burst. Digital processors can be used to calculate and store data to optimize performance.

However, this case is compared with the previous case 3. The previous case 3 does not use an interleaved power factor corrector and a resonant circuit to complete the laser diode drive. Secondly, the previous case 3 does not mention how to implement a narrow pulse current-driven laser diode. Furthermore, the previous case 3 does not mention the method of combining multiple laser beams.

Please refer to the previous case 4, US invention patent US 5,987,045 "HIGH POWER NARROW PULSE LASER DIODE CIRCUIT", which discloses a resonant drive circuit for a laser diode, including a pulse generator for generating a narrow output pulse for generating The reflected composite output delay line of the output pulse from the transmission line terminal is used for the laser diode output that generates the optical output from the composite, and the forward bias network biases the laser diode.

However, the input power of the driving circuit mentioned in the previous case 4 is DC, so there is no mention of using a power factor corrector. Secondly, the proposed resonant drive circuit is not driven by the period when the peak voltage of the sine wave is higher than the forward bias of the laser diode. Furthermore, the previous case 4 does not mention the integration of laser beams and the method of generating narrow pulse lasers.

Please refer to the previous case 5, US invention patent US 2003/0039280 A1 "METHOD AND APPARATUS FOR DRIVING LASER DIODE SOURCES", to disclose a method and device for driving a laser diode, such as laser two Array of polar bodies or laser diodes. The response of the drive control is to control the current with a signal of overcurrent or current density. The signal can be obtained from the drive current and the voltage across the original laser diode, or the impedance of the laser diode. This drive device uses GCT switches to achieve pulse action. The pulse driving signal of the laser diode can be generated by a charging circuit of a capacitor or an inductor.

However, the input power supply of the driving circuit mentioned in the previous case 5 is DC, so the input power supply different from this case is AC mains power, so no power factor corrector is used. Secondly, the proposed laser diode driver does not use a resonant tank circuit to generate a narrow pulse laser drive current. Furthermore, although the previous case 5 is to drive a laser diode array, it does not mention how to realize the integration of multiple laser beams.

It can be seen that there are still many defects in the above-mentioned custom items, which is not a good designer and needs to be improved urgently.

In view of this, the inventor of this case had many years of experience in manufacturing development and design of related products, and after detailed design and careful evaluation of the above-mentioned objectives, a practical invention was finally obtained.

An object of the present invention is a three-wavelength high optical output power laser diode power supply system and its driving method, which combines a power factor modifier and a resonant converter to complete the operation of the AC universal input power supply range to drive high optical power Output power laser diodes, as well as narrow pulse lasers.

According to the above purpose, the three-wavelength high-output laser diode power supply system of the present invention has a safety standard circuit, a power factor correction, and a first wavelength laser First wavelength laser driving controller, a second wavelength laser diode controller, a third wavelength laser diode controller, and a complex number A first-wavelength laser diode, a plurality of second-wavelength laser diodes, and a plurality of third-wavelength laser diodes; wherein, the power source of the system comes from the power grid, through the safety regulations Circuit input power factor corrector; each of the wavelength laser diode drivers respectively drives the plurality of first, second and third wavelength laser diodes; wherein, each of the wavelength laser diodes The body drive controller is composed of a switch circuit, a transformer, a resonant tank circuit, a full-wave rectifier, a filter capacitor ( C _fw ), and a filter stop switch ( S _off ). Each of the wavelength laser diode systems is connected to the output end of the driver, wherein the switch circuit converts the input DC power ( V _in ) into a high-frequency positive and negative pulse wave power supply, which is connected to the switch circuit The transformer is induced from the primary side to the secondary side, and a resonant tank circuit is used to generate a sine wave voltage ( v _lc ); when the filter stop switch ( S _off ) is in an on (closed) state, through the full-wave rectifier and the filter capacitor , You can generate a DC voltage and current to drive the laser diode, so that each wavelength laser diode produces a continuous wave laser; when the filter stop switch ( S _off ) is in the off (open) state, the The resonant tank circuit combined with the full-wave voltage generated by the full-wave rectifier will directly drive the laser diode so that the plurality of first, second, or third wavelength laser diodes are at a high full-wave rectified voltage The laser diode is turned on during the forward bias period of each laser diode, thereby generating a high-frequency narrow pulse current to drive the laser diode.

Another object of the present invention is to drive a three-wavelength high-optical-output laser diode power supply system, including: Step 1, the first, second, or third wavelength laser diode driver A switch circuit converts the input DC power into a high-frequency positive and negative pulse power, and then induces it to the secondary side through the primary side of a transformer, and uses a resonant tank circuit to generate an approximate sine wave voltage; Step 2. When the filter stops switching ( S _off ) is in the on (closed) state, through a full-wave rectifier and a filter capacitor ( C _fw ), can generate a DC voltage and current to drive the plurality of first, second or third wavelength laser two Polar body, and then generate a continuous wave laser; step 3, and if the number of each of the plurality of first, second or third wavelength laser diodes is greater than or equal to (≧) 4, each of the plurality of The laser diodes of the first, second or third wavelengths can be respectively combined with a plurality of optical fiber systems, so as to use the optical fiber systems to complete the laser multi-beam combining into a single beam.

Another object of the present invention is another driving method of a three-wavelength high-output laser diode power supply system. Step 1, the first, second or third wavelength laser diode driver is used A switch circuit converts the input DC power into a high-frequency positive and negative pulse power, and after induction to the secondary side through a transformer's primary side, a resonant tank circuit is used to generate an approximate sine wave voltage; Step 2. When the first and When the filter stop switch ( S _off ) is off (open) in the second or third wavelength laser diode driver, the full-wave rectified voltage is generated by the full-wave rectifier through the full-wave rectifier. Drive the plurality of first, second or third wavelength laser diodes; Step 3: when the full-wave rectified voltage is higher than the forward bias of the laser diodes, a narrow pulse current drive is generated during this period Laser diode; Step 4, and if the number of each of the plurality of first, second or third wavelength laser diodes is greater than or equal to (≧) 4, each of the plurality of first and second Or, the third wavelength laser diode can be respectively combined with a plurality of optical fiber systems to use the optical fiber systems to complete the laser multi-beam combining into a single beam.

10: Three-wavelength high optical output power laser diode power supply system

1: Safety circuit

2: Power factor corrector

4: First wavelength laser diode driver

5: Second wavelength laser diode driver

6: Third wavelength laser diode driver

7: plural first-wavelength laser diodes

8: plural second wavelength laser diodes

9: plural third-wavelength laser diodes

3: City power

70: The first optical fiber system

80: Second optical fiber system

90: Third optical fiber system

41: switch circuit

42: Transformer

43: Resonant tank circuit

44: full wave rectifier

45: filter capacitor

46: Filter stop switch

47: plural first, second or third wavelength laser diodes

50: digital signal processor

51: Current detection group R _sg

52: Voltage signal amplifier

53: Analog/Digital Converter

54: Digital pulse width modulation controller

55: proportional integral derivative control module

56: Isolated gate driver

LD ₁ , LD ₂ , LD ₃ , LD ₄ : laser diode

61: plural lenses

67: First coupling fiber

68: Second coupling fiber

71: Third coupling fiber

63: First fiber

64: second fiber

65: third fiber

66: fourth fiber

69: Fifth fiber

70: sixth fiber

62: seventh fiber

S110: Step

S120: Step

S130: Step

S210: Step

S220: Step

S230: Step

S240: Step

V _in : input DC power

v _lc : sine wave voltage generated by the resonant tank circuit

v _fw : full-wave rectified voltage

V _ld , v _ld : laser diode drive voltage

I _ld , i _ld : laser diode drive current

C ₁ , C ₂ : Voltage dividing capacitor

O ₁ , Q ₂ : power transistor

L _r : resonant inductance

C _{r 1} , C _{r 2} : Resonance capacitance

D _{fw 1} , D _{fw 2} , D _{fw 3} , D _{fw 4} : Diode

Fig. 1 is a system architecture diagram of a three-wavelength high optical output power laser diode power supply system of the present invention.

Fig. 2 is a circuit block diagram of one of the first, second or third wavelength laser diode drivers of Fig. 1;

Figure 3 is the actual circuit diagram of Figure 2.

Fig. 4 is a block diagram of the secondary side circuit structure of Fig. 3 combined with a feedback control circuit.

Fig. 5 is a waveform diagram of a three-wavelength high-optical-output laser diode power supply system of the present invention that generates a narrow pulse current to drive the laser diode.

FIG. 6 is a schematic diagram of a three-wavelength high optical output power laser diode power supply system combined with a laser fiber system of the present invention.

Figures 7(a), 7(b), 7(c), 8(a), 8(b), 9(a), 9(b), 9(c) are three wavelength high optical output of the present invention Waveform simulation diagram of power laser diode power supply system.

Fig. 10 is a step of a driving method of a three-wavelength high optical output power laser diode power supply system of the present invention.

FIG. 11 is the steps of another driving method of the three-wavelength high optical output power laser diode power supply system of the present invention.

In order to facilitate your examiner to understand the technical features, content and advantages of the present invention and the achievable effects, the present invention is described in detail in conjunction with the drawings and in the form of expressions of the embodiments, and the drawings used therein, which The main purpose is only for illustration and auxiliary description, not necessarily the true proportion and precise configuration after the implementation of the present invention, so the proportion and configuration relationship of the attached drawings should not be interpreted and limited to the scope of the present invention in practical implementation. He Xianming.

First of all, please refer to Figures 1 and 2 for the three-wavelength high-output laser diode power supply system 10 of the present invention, which has a safety circuit 1, a power factor corrector 2, a first A wavelength laser diode driver 4, a second wavelength laser diode driver 5, a third wavelength laser diode driver 6, and a plurality of first wavelength laser diodes Body 7, a plurality of second wavelength laser diodes 8 and a plurality of third wavelength laser diodes 9, a first optical fiber system 70, a second optical fiber system 80 and a third optical fiber system 90.

Among them, the power supply of the system 10 comes from a mains 3, the input of the safety circuit 1 is connected to the mains 3, the output of the safety circuit 1 is connected to the input of the power factor corrector 2; the power factor can correct the input of the mains The voltage and current are in the same phase, so as to complete the purpose of power factor correction, and can provide an approximate DC power supply as the input DC power supply of each laser diode driver (4, 5, 6).

The input terminals of the first wavelength laser diode driver 4, the second wavelength laser diode driver 5, the third wavelength laser diode driver 6 and the output end of the power factor corrector 2 Connect. The first wavelength laser diode driver 4, the second wavelength laser diode driver 5, and the third wavelength laser diode driver 6, respectively drive a plurality of first wavelength laser diodes Polar body 7, a plurality of second wavelength laser diodes 8 and a plurality of third wavelength laser diodes 9.

Please also refer to FIG. 2, each of the first, second, and third wavelength laser diode drivers (4, 5, 6) is composed of a switch circuit 41, a transformer (Transformer) 42, A resonant tank circuit 43, a full-wave rectifier 44, a filter capacitor ( C _fw ) 45, a filter stop switch ( S _off ) 46 and a plurality of first, second or third wavelength laser diodes 47 ; The input terminal of the switch circuit 41 is connected to an input DC power supply ( V _in ), the output terminal of the switch circuit 41 is connected to the primary side of the transformer 42, the secondary side of the transformer 42 is connected to the input terminal of the resonant tank circuit 43, the resonant tank circuit the output terminal 43 is connected to the input terminals of the full wave rectifier 44, the output of the full wave rectifier 44 and the filter capacitor (C _fw) 45 in contact with a first end, a filter capacitor (C _fw) 45 and a second end stop switch filter ( S _off )46 is connected to the first end, the filter stop switch ( S _off ) 46 is connected to the ground end, and the filter capacitor ( C _fw ) 45 is connected to the first, second or third wavelengths The first end of the laser diode 47 is connected, and the second ends of the plurality of first, second or third wavelength laser diodes 47 are connected to the ground.

Among them, the switch circuit 41 converts the input DC power supply ( V _in ) into a high-frequency positive and negative pulse wave power supply, and after the primary side of the transformer 42 is induced to the secondary side, the resonance tank circuit 43 is used to generate an approximate sine wave voltage; when filtering The stop switch ( S _off ) 46 is in an on (closed) state, and a full-wave rectifier 44 and a filter capacitor ( C _fw ) 45 can be used to generate a DC voltage and current to drive a plurality of first, second or third wavelengths The laser diode 47 generates a continuous wave laser. When the filter stop switch ( S _off ) 46 is in an off (open) state, the resonant tank circuit 43 combined with the full-wave rectified voltage generated by the full-wave rectifier 44 directly drives a plurality of first, second or third wavelength lasers Polar body 47, therefore, a plurality of first, second or third wavelength laser diodes 47 can be turned on during the forward bias of the full-wave rectified voltage ( V _fw ) higher than the laser diodes, thereby A narrow pulse current is generated to drive a plurality of first, second or third wavelength laser diodes 47.

Furthermore, please refer to FIG. 3, which is a circuit diagram of the embodiment of FIG. 2, but it is not limited to this circuit architecture. The circuit components on the primary side of the transformer 42 include two voltage-dividing capacitors ( C ₁ , C ₂ ) and two power transistors ( Q ₁ , Q ₂ ) composed of a switching circuit 41; on the secondary side of the transformer 42 Circuit components, including resonant inductance ( L _r ) and resonant capacitor ( C _{r 1} , C _{r 2} ); a full-wave rectifier composed of four diodes ( D _{fw 1} , D _{fw 2} , D _{fw 3} , D _{fw 4} ) 44, and a filter capacitor ( C _fw ) 45 and a filter stop switch ( S _off ) 46, which are connected to a plurality of first, second, or third wavelength laser diodes 47.

If the output load is short-circuited, the resonant tank circuit can effectively limit the loop current; while the multiple first, second, or third wavelength laser diodes 47 operate at forward bias, the equivalent resistance is very small If the driving current is not limited, the laser diode will be damaged due to over-current operation. Therefore, the topology of the resonant tank circuit 43 can effectively prevent the occurrence of short-circuit current and generate a sine wave voltage ( V _lc ).

Please refer to the figure 4 again, in order to complete the laser diode to produce continuous wave laser, the filter stop switch ( S _off ) 46 is turned on (closed), and the laser diode drive current ( i _ld ) After being converted into a voltage signal by a current detection resistance ( R _sg ) 51, amplified by a voltage signal amplifier (Voltage signal amplifier) 52, input into a digital signal processor (Digital signal processor) 50 An analog/digital converter 53, and then through a proportional integral derivative control module 55, generates an error signal to control a digital pulse width modulation controller 54 to thereby control the power transistors ( Q ₁ , Q ₂ ) (as the third The frequency or duty cycle of the driving signals ( v ₁ and v ₂ ) in the figure. The control signal generated by the digital pulse width modulation controller 54 drives the primary-side power transistors ( Q ₁ , Q ₂ ) of the transformer 42 through an isolated gate driver 56 (please also refer to section 3 (Shown in the figure), thereby controlling the driving voltage and current of a plurality of first, second or third wavelength laser diodes 47.

Please also refer to Figure 1 and Figure 2, where the first, second or third wavelength laser diode driver (4, 5, 6), uses the transformer 42 to achieve the purpose of isolation, The transformer 42 may or may not be used for non-isolation purposes. Secondly, the resonant tank circuit 43 is composed of an inductor and a capacitor, and its series and parallel connection types are not limited. At the same time, the switch circuit 41 is a half-bridge architecture and can be completed by a full-bridge architecture and a push-pull architecture. It is not limited to the proposed architecture.

Please refer to FIG. 4 again, the digital signal processor 50 can be replaced by a discrete integrated circuit, and the digital signal processor 50 or the discrete integrated circuit is not limited to realize the feedback compensation.

Please refer to Fig. 5 for the signal waveform diagram marked in Fig. 4. Please refer to figure 4 first, when the filter stop switch ( S _off ) 46 is operated in the off (open) state, the full-wave rectified voltage ( V _fw ) generated by the resonant tank circuit and the full-wave rectifier will not be _affected by the capacitor ( C _fw ) filtering becomes direct current, so a plurality of first, second or third wavelength laser diodes 47 can be driven by a full-wave rectified voltage. The purpose of this method is as follows:

1. With the forward bias of multiple first, second or third wavelength laser diodes 47, the laser diode can be turned on at the peak of the full-wave rectified voltage.

2. A plurality of first, second or third wavelength laser diodes 47 are turned on at the peak of the full-wave rectified voltage, and a short on-time generates a narrow pulse of driving current so that the first, second or third The third wavelength laser diode 47 produces a narrow pulse laser.

3. When driving a plurality of first, second or third wavelength laser diodes 47 with full-wave rectified voltage, the frequency of the narrow pulse driving current is twice the switching frequency of the power transistor (2 fs ), please See figure 5.

Please refer to Figure 1, Figure 2, Figure 4 and Figure 6 again, when the number of plural first, second or third wavelength laser diodes 47 is 4, but the number is also Can be greater than or equal to (≧) 4, and multiple first, second, or third wavelength laser diodes 47 can be combined with the first, second, and third fiber optic systems 70, 80, and 90 (see Figure 1 (Shown), the four laser beams can be combined into a single beam, and a laser with high optical output power can be generated. Please refer to FIG. 6 again, each of the optical fiber system 60, 70, 80 architectures includes four laser diodes LD ₁ , LD ₂ , LD ₃ and LD ₄ , and a plurality of lenses 61 (Condensing lens) in the embodiment of this case The middle system uses five, first, second, third and fourth optical fibers 63, 64, 65 and 66, and first, second or third coupling fibers (Coupling fiber) 67, 68, 71. First, the laser beam emitted by the first, second, or third wavelength laser diode 47 is focused or scattered by the lens 61 onto the optical fiber. Therefore, the flexibility of the optical fiber is used to adjust the scattering direction of the laser. Therefore, the first, second, or third wavelength laser diode 47 uses the first, second, and third coupling optical fibers 67, 68, and 71 to combine the two optical fibers into one, thereby completing the double laser combining One purpose; at the same time, taking this case as an example, the first and second optical fibers 63, 64, the third and fourth optical fibers 65, 66 are coupled into the fifth and The sixth optical fibers 69 and 70 are coupled to the seventh optical fiber 62 by using the third coupling optical fiber 71, thereby completing the integration of four laser beams.

Please refer to Figure 7(a), 7(b), 7(c), when the filter stop switch ( S _off ) 46 in Figure 3 is in the on (closed) state, use the circuit simulation software (PowerSIM) to simulate resonance The output voltage ( V _lc ) of the tank circuit 43, the driving voltage ( V _ld ) and driving current ( I _ld ) waveforms of the first, second or third wavelength laser diode 47. Figure 7(a) shows that the operating frequency of the first wavelength laser diode v _lc is 94 kHz, so that V _ld =10.4V and I _ld =0.8A. Figure 7(b) shows the V _lc operating frequency of the second wavelength laser diode driver at 92kHz, so that V _ld = 21.2V and I _ld = 1.6A. Figure 7(c) shows the V _lc operating frequency of the third wavelength laser diode driver at 90 kHz, so that V _ld =24V and I _ld =1.2A.

Please refer to Figures 8(a) and 8(b). Taking the second wavelength laser diode driver as an example, when the filter stop switch ( S _off ) 46 in Figure 3 is in the on (closed) state , A signal ( V _pulse ) is set by the circuit simulation software to control the on time of the V ₁ and V ₂ drive signals in Figure 3, thereby simulating the drive voltage ( V _ld ) and drive of the plurality of second wavelength laser diodes Current ( I _ld ). As shown in Figure 8(a), the frequency of V _pulse is 100Hz (10ms). From the figure, it can be seen that V _ld and I _ld cannot follow the _pulse pulse form of V _pulse , which means a plurality of second wavelength laser diodes The body cannot be fully turned on and off, and the rising and falling edges of the driving voltage and current have a drag phenomenon. As shown in Figure 8(b), the frequency of V _pulse is adjusted to 1kHz (1ms). From the figure, it can be seen that V _ld and I _ld can not take the form of pulse wave with V _pulse , and there is no rising edge of pulse wave The occurrence of the falling edge means that the laser diode cannot be effectively cut off to stop the optical power output of the laser. Please also refer to Figure 3, by controlling the on time of the V ₁ and V ₂ drive signals, the purpose of driving the laser diode with a narrow pulse cannot be achieved.

Please refer to Figure 9(a), 9(b), 9(c), please also refer to Figure 3, the filter stop switch ( S _off ) 46 is off (open) state, using circuit simulation software simulation The output voltage ( V _lc ) of the resonant tank circuit, the driving peak voltage ( V _ld ) and driving current ( I _ld ) of the first, second or third wavelength laser diode 47. As shown in Figure 9(a), the operating frequency of the first wavelength laser diode V _lc is 105 kHz, so that V _{ld ( peak )} =10.4V and I _{ld ( peak )} =0.8A. Figure 9(b) shows the V _lc operating frequency of the second wavelength laser diode at 109 kHz, so that V _ld(peak) = 21.2V and I _{ld ( peak )} =1.6A. Figure 9(c) shows that the V _lc operating frequency of the third wavelength laser diode is 107 kHz, so that V _ld(peak) =24V and I _{ld ( peak )} =1.2A. As the above simulation results confirm, the first, second or third wavelength laser diode 47 is driven by a full-wave rectified voltage, and the narrow pulse driving current of the laser diode is about 1 μs, which represents the three wavelengths developed in this case The high optical output power laser diode power system can produce a narrow pulse laser of about 1μs.

Please refer to FIG. 10, which is a driving method for a three-wavelength high-output laser diode power supply system. The driving method includes the following steps: Step 1, S110 first, second, and third wavelength lasers The diode driver uses a change-over switch circuit to convert the input DC power to a high-frequency positive and negative pulse wave power, and then induces it to the secondary side through the primary side of a transformer, and uses a resonant tank circuit to generate an approximate sine wave voltage; steps 2. S120 When the filter stop switch ( S _off ) is in the on (closed) state, a full-wave rectifier and a filter capacitor ( C _fw ) can be used to generate a DC voltage and current to drive the plurality of first and second Two or third wavelength laser diodes, which in turn produce continuous wave lasers; Step 3, S130, and if the number of the plurality of first, second, or third wavelength laser diodes is greater than or equal to (≧) When 4, each of the plurality of first, second or third wavelength laser diodes can be respectively combined with a plurality of optical fiber systems to use the optical fiber system to complete the laser multi-beam combination into a single beam, thereby Produces high optical output power lasers.

Please refer to Figure 11 for a three-wavelength high optical output power laser diode power system driving method, and another driving method includes the following steps: Step 1, S210 first, second and third wavelength laser The emitter diode controller uses a switch circuit to convert the input DC power to a high-frequency positive and negative pulse power. After the primary side of a transformer is induced to the secondary side, the resonant tank circuit generates an approximate sine wave voltage; Step 2. S220 When the filter stop switch ( S _off ) is off (open) in the first, second, and third wavelength laser diode drivers, the sine wave voltage generated by the resonant tank circuit passes The full-wave rectifier generates a full-wave rectified voltage and directly drives the plurality of first, second, and third wavelength laser diodes; Step 3, S230 When the full-wave rectified voltage is higher than the forward bias of the laser diode When the voltage is low, a narrow pulse drive current is generated to drive the laser diode during this period; Step 4, S240, and if the number of each of the plurality of first, second or third wavelength laser diodes is greater than or equal to (≧) When four, each of the plurality of first, second or third wavelength laser diodes can be correspondingly combined with a plurality of optical fiber systems to use the optical fiber system to complete the laser multi-beam combination into a single beam, thereby generating High optical output power laser.

In summary, the three-wavelength high-optical-output laser diode power supply system and its driving system of the present invention do have an unprecedented innovative structure, which has not been seen in any publications, and there are no similar products on the market. The product is based on its novelty consider. In addition, the unique features and functions of the present invention are far from comparable to conventional ones, so it is indeed more progressive than conventional ones, and it complies with the provisions of the Chinese Patent Law on the requirements for application of invention patents, and patent applications are filed in accordance with the law.

However, the illustrations and descriptions disclosed above are only preferred embodiments of the present invention, and are not intended to limit the scope of protection of the present invention; those who are familiar with this skill, according to the characteristic scope of the present invention, do other things Equivalent changes or modifications should be regarded as not departing from the design scope of the present invention.

41: switch circuit

42: Transformer

43: Resonant tank circuit

44: full wave rectifier

45: filter capacitor

46: Filter stop switch

47: plural first, second or third wavelength laser diodes

V _in : input DC power

v _lc : sine wave voltage generated by the resonant tank circuit

v _fw : full-wave rectified voltage

V _ld : laser diode drive voltage

Claims (8)

A three-wavelength laser output power system with high optical output power, wherein: a first-wavelength laser diode driver is connected and simultaneously drives a plurality of first-wavelength laser diodes; a second The wavelength laser diode driver is connected and simultaneously drives a plurality of second wavelength laser diodes, and is connected in parallel with the first wavelength laser diode driver; a third wavelength laser The diode driver is connected to and simultaneously drives a plurality of third wavelength laser diodes, and is controlled by the first wavelength laser diode driver and the second wavelength laser diode The inverters are connected in parallel; each of the wavelength laser diode drivers includes: a switch circuit that converts an input DC power supply into a high-frequency positive and negative pulse power supply; a transformer is connected to the switch circuit, and The high frequency positive and negative pulse power supply is induced from the primary side to the secondary side; a resonant tank circuit is connected to the transformer, and the high frequency positive and negative pulse power supply generates a sine wave voltage through the resonant tank circuit; a full A wave rectifier is connected to the resonant tank circuit; a filter stop switch is connected to the full-wave rectifier; a filter capacitor is connected to the filter stop switch and the sine wave is connected by the filter stop switch turned on The voltage generates a DC voltage and a current through the full-wave rectifier and the filter capacitor to drive each of the wavelength laser diodes, while simultaneously causing each of the wavelength laser diodes to generate a continuous-wave laser. The three-wavelength high-optical-output laser diode power supply system as described in item 1 of the patent scope, wherein the filter stop switch is in the on state, and the drive current of the laser diode is converted by a current detection resistor It is a voltage signal, and the voltage signal amplifier is amplified, and then input to an analog/digital converter of a digital signal processor. An internal proportional integral derivative control module generates an error signal to control a digital pulse width modulation control To control the frequency or duty cycle of the drive signal of the power transistor, and drive the power transistor of the switch circuit through an isolated gate driver to control the plurality of first, second or third wavelength lasers The driving voltage and current of the polar body. The three-wavelength high-optical-output laser diode power supply system as described in item 1 of the patent application scope, wherein the resonant tank circuit is composed of an inductor and a capacitor, and is connected in series or parallel to each other. The three-wavelength high-optical-output laser diode power supply system as described in item 1 of the patent scope, wherein the switch circuit is a half-bridge architecture and can be completed by a full-bridge architecture and a push-pull architecture. The three-wavelength high-optical-output laser diode power supply system as described in item 2 of the scope of the patent application, in which the digital signal processor can also realize feedback control compensation by discrete integrated circuits. The three-wavelength high-optical-output laser diode power supply system as described in item 2 of the patent application scope, wherein each of the wavelength laser diodes can be correspondingly combined with a first optical fiber system, a second optical fiber system, And a third optical fiber system, so that the laser beams of each optical fiber system are combined into a single beam to generate a high optical output power laser. A three-wavelength high optical output power laser diode power supply driving method, which includes the following steps: Step 1, a first wavelength laser diode driver, a second wavelength laser diode driver or A third-wavelength laser diode driver, using a switch circuit to convert an input DC power supply into a high-frequency positive and negative pulse power supply, is induced by a transformer primary side to the secondary side, and then generated by a resonant tank circuit An approximate sine wave voltage; Step 2. When a filter stop switch is turned on, a full-wave rectifier and a filter capacitor and a filter capacitor can generate a DC voltage and current to drive a plurality of first, second or A third wavelength laser diode, which in turn produces a continuous wave laser; step 3, and if the number of each of the plurality of first, second, or third wavelength laser diodes is greater than or equal to (≧) 4 , Each of the plurality of first, second or third wavelength laser diodes can be respectively combined with a plurality of optical fiber systems to use the optical fiber system to complete the laser multi-beam combination into a single beam, thereby generating high optical Output power laser. A three-wavelength high optical output power laser diode power supply driving method, and another driving method includes the following steps: Step 1, a first wavelength laser diode driver, a second wavelength laser diode driver Or a third-wavelength laser diode driver, using a switch circuit to convert an input DC power supply to a high-frequency positive and negative pulse power supply, using a resonant tank circuit after sensing the primary side of the transformer to the secondary side Generate an approximate sine wave voltage; Step 2. When the filter stop switch of the first, second and third wavelength laser diode controllers is turned off, the sine wave voltage generated by the resonant tank circuit generates a full wave through a full wave rectifier The rectified voltage directly drives a plurality of laser diodes of the first, second or third wavelength; Step 3. When the full-wave rectified voltage is higher than the forward bias of the laser diode, a narrow pulse is generated during this period The driving current drives the laser diode; Step 4, and if the number of each of the plurality of first, second or third wavelength laser diodes is greater than or equal to (≧) 4, each of the plurality of first , The second or third wavelength laser diodes can be correspondingly combined with a plurality of optical fiber systems to use each optical fiber system to complete the laser multi-beam combination into a single beam, thereby generating a high optical output power laser.

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