Semiconductor laser power supply device based on PWM control
A technology for power supply devices and lasers, which is applied in the direction of semiconductor lasers, lasers, laser components, etc., can solve problems such as poor anti-interference, limited control accuracy, and complex circuits, and achieve stable and reliable drive power. Simplified circuit structure, circuit achieve convenient effects
Inactive Publication Date: 2013-08-21
NANJING UNIV OF SCI & TECH
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[0003] Most of the existing semiconductor laser power supplies are of the series type, as described in Wang Qin's "50mA Semiconductor Laser Drive Power Circuit Design", Journal of Jingdezhen Higher Education, June 2012, Volume 27, Issue 6, using the constant current characteristics of transistors And the negative feedback principle of the operational amplifier achieves the purpose of stabilizing the current, but such a circuit system often contains too many components and the circuit is complex, so the anti-interference is not good
Another example is that the publication number CN101436755A relates to a low-power semiconductor laser power drive device, which also adopts a traditional series circuit. The power supply is distributed among components such as operational amplifiers, resistors and transistors, so the efficiency is low; at the same time, it depends on the constant current of the transistor Control, long-term use will bring about temperature rise, which limits the control accuracy and also limits the application of semiconductor lasers
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[0010] The implementation of the semiconductor laser power supply device will be described in detail with reference to the accompanying drawings. PWM control refers to pulse width modulation, which is characterized by fixed switching frequency and adjustable switching duty cycle. Most existing integrated switching power supplies use this control method. figure 1 It is the schematic diagram of the preferred TPS62240 to realize PWM control, in which the DC converter U1 can also be replaced by LM2734, LM4674 and other switching DC converters based on the PWM principle. For the TPS62240 chip, the input terminal Vin is connected to a positive 5V voltage, the enable terminal EN is connected to a high level, the output terminal SW is connected to one end of the inductor L1, the other end of the inductor L1 is the output voltage Vout, and the feedback terminal FB of the DC converter U1 passes through The bidirectional switch S is connected to the power feedback module 2 and the curren...
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The invention relates to a semiconductor laser power supply device based on PWM control. The semiconductor laser power supply device based on the PWM control is composed of an inductor, a PWM controller, a semiconductor laser, a protective resistor and other elements. Direct voltage is connected to the PWM controller, the output end of the PWM controller is connected with the inductor in series and grounded through a parallel branch of a photodiode, the laser and a filter capacitor, the feedback end of the PWM controller is connected with the protective resistor, thus constant voltage is maintained, and constant current control or constant power control is achieved. The semiconductor laser power supply device based on the PWM control can provide constant current drive for medium-low-power semiconductor lasers, wherein the constant current drive is stable, reliable, high-efficiency and high in anti-interference performance.
Description
technical field [0001] The invention relates to a semiconductor laser power supply, in particular to a semiconductor laser power supply device. Background technique [0002] Semiconductor lasers are widely used in industry and scientific research because of their small size, light weight, and high efficiency. However, once the Pn junction is broken down, the output will decrease or fail, and the slight fluctuation of the driving current will also cause a sharp change in optical power. and broadening of the spectrum. Therefore, there is a need for a highly stable power supply that can provide reliable current driving for semiconductor lasers. [0003] Most of the existing semiconductor laser power supplies are of the series type, as described by Wang Qin in "Design of 50mA Semiconductor Laser Driving Power Supply Circuit", Journal of Jingdezhen Higher Education, June 2012, Volume 27, Issue 6, using the constant current characteristics of transistors And the negative feedbac...
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IPC IPC(8): H01S5/042
Inventor 王春勇韩静严伟戴昊
Owner NANJING UNIV OF SCI & TECH