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Method and circuit of series control voltage fine controlling power source

A technology for controlling voltage and voltage-boosting circuits, which is applied in control/regulation systems, electrical components, and regulation of electrical variables. It can solve problems such as poor stability, complex circuit structure, and high cost, and achieve stable output voltage and high adjustment accuracy. The effect of concise cost

Active Publication Date: 2013-05-22
福州欣联达电子科技有限公司
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

Not only is the cost high and the circuit structure is complex, but the voltage control accuracy is not accurate
[0003] In addition, in LED lamps, the LED driving circuit is a switching power supply with constant current output. Existing circuits often use thyristor dimmers to achieve automatic dimming, which not only has poor stability, but also has no versatility, and the design cost high

Method used

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  • Method and circuit of series control voltage fine controlling power source
  • Method and circuit of series control voltage fine controlling power source

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0025] The embodiment of the present invention provides a method for serially controlling the voltage fine-tuning power supply, which is characterized in that: it is suitable for switching power supplies, the method provides a shift latch, and the shift latch is controlled by serially transmitting control signals The connection resistance value of the plurality of voltage dividing resistors at the output end of the switching power supply is adjusted to adjust the output voltage of the switching power supply. The shift latch is also provided with a proportional buck-boost circuit to realize the proportional increase or decrease of the output voltage.

[0026] In an embodiment of the present invention, the shift latch is an 8-bit shift latch. When the shift latch is 8 bits, there are 8 voltage dividing resistors, which are 1 / 2 according to the ratio of t...

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Abstract

The invention relates to a method of series control voltage fine controlling a power source. The method is characterized of being suitable for a switch power source, and providing a shifting latch. Series transmission control signals are utilized to control the shifting latch to adjust access resistance values of a plurality of divider resistors at an output end of the switch power source so as to adjust output voltage of the switch power source. According to the method and the circuit, a concise low-cost scheme is adopted. The shifting latch is utilized to realize adjustment of the series signals on output voltage of the switch power source, and the method and the device have the advantages of being high in adjusting accuracy, stable in output voltage, and the like.

Description

technical field [0001] The invention relates to the technical field of power supplies, in particular to a method and circuit for serially controlling voltage fine-tuning power supplies. Background technique [0002] The existing switching power supply is widely used in various electrical equipment due to its high stability and simple circuit structure. Among them, the switching power supply with multi-channel adjustable output voltage is generally installed with multiple voltage regulation modules at the output end of the power supply. Or add taps to the switching power supply transformer to achieve. It not only has high cost and complicated circuit structure, but also has inaccurate voltage control precision. [0003] In addition, in LED lamps, the LED drive circuit is a switching power supply with constant current output. Existing circuits often use thyristor dimmers to achieve automatic dimming, which not only has poor stability, but also has no versatility, and the des...

Claims

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Application Information

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IPC IPC(8): H02M3/156
Inventor 林钦陈沈明陈金雄陈昭宇张文华
Owner 福州欣联达电子科技有限公司
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