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Power supply circuit

A technology of power supply circuit and input power, which is applied in the direction of circuits, electrical components, laser components, etc., can solve the problem that the laser diode driver power supply cannot meet the requirements, etc., and achieve easy expansion connection, high power conversion efficiency, and fast signal feedback speed Effect

Inactive Publication Date: 2018-02-09
GOERTEK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of the problem that the laser diode driver power supply in the prior art cannot meet the requirements, a power supply circuit of the present invention is proposed to overcome the above-mentioned problem or at least partially solve the above-mentioned problem

Method used

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Embodiment Construction

[0031] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0032] The technical idea of ​​the present invention is: use the DC-DC conversion module to convert the input power supply into a constant voltage and constant current power supply, and simulate the output voltage and output current through the voltage sampling module and the current sampling module, and isolate and feed back the analog sampling value to The feedback input terminal of the DC-DC conversion module uses constant voltage and current, the power conversion efficiency of the circuit is high, the output current range is large, and the signal feedback speed is fast, and the analog sampling value is fed back to the feedback input of the DC-DC conversion module after isolation terminal, which also reduces the influence of the feed...

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Abstract

The invention discloses a power supply circuit comprising a DC-DC conversion module, a voltage sampling module, a current sampling module and an MCU control module. The voltage sampling module and thecurrent sampling module are connected with the feedback input end of the DC-DC conversion module. The MCU control module is connected with the voltage sampling module and the current sampling module.The DC-DC conversion module converts an input power supply into a preset constant voltage and constant current power supply. The voltage sampling module performs simulated sampling of the output voltage signals of the DC-DC conversion module and performs isolation feedback of the simulated sampling values to the DC-DC conversion module. The current sampling module performs simulated sampling of the output current signals of the DC-DC conversion module and performs isolation feedback of the amplified simulated sampling values to the DC-DC conversion module. The MCU control module is used for changing the sampling values outputted by the voltage sampling module or the current sampling module so as to adjust the voltage or current constant value outputted by the DC-DC conversion module and provide an adjustable constant voltage and constant current power supply.

Description

technical field [0001] The invention relates to the technical field of circuit design, in particular to a power supply circuit. Background technique [0002] Laser scanning projectors have the advantages of low heat generation and high energy conversion rate. Compared with digital micromirror element projectors, they can effectively solve the problem of overheating of projectors after long-term use. The working needs of the laser driver-adjustable constant voltage and constant current power supply, because the brightness of the laser diode will be adjusted according to the field test environment, brightness, etc. during the production line test. This adjustment range is large, and the required constant current is from several hundred milliamperes to However, in the existing constant current power supply, the transistor constant current source and the field effect tube constant current source are easily affected by temperature, the output current is insufficient, and the volt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S5/042
CPCH01S5/042
Inventor 高文刚
Owner GOERTEK INC
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