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Switching mode power source

A switch-mode power supply, switching tube technology, applied in electrical components, adjusting electrical variables, output power conversion devices, etc., can solve the problems of poor loop stability, slow response speed, and complex circuit schemes, and achieve loop stability. High, response speed block, good loop stability effect

Active Publication Date: 2012-06-06
BYD SEMICON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the disadvantages of complex circuit scheme, slow response speed and poor loop stability of the existing switch mode power supply, and proposes a switch mode power supply. The switch mode power supply has the advantages of simple circuit, fast response speed and good loop stability The advantages

Method used

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Embodiment Construction

[0015] Such as figure 2 As shown, a switch mode power supply provided by the present invention includes a rectifier filter 1, a controller 2, a switch tube 3 and a transformer 4, and the transformer 4 includes a primary coil 41, a secondary coil 42 and an auxiliary coil 43, the primary coil 41 is connected to one end of the switch tube 3, the other end of the switch tube 3 is connected to the current detection terminal of the controller 2, the secondary coil 42 is used to connect the output circuit 5, and the output terminal of the rectifier filter 1 is connected to the control The power input terminal of the device 2, the drive waveform output terminal of the controller 2 is connected to the control terminal of the switch tube 3, and the controller 2 is used to output the drive waveform according to the input feedback voltage to control the on-off of the switch tube 3 to stabilize the secondary The voltage or current output by the coil 42, wherein the auxiliary coil 43 of th...

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Abstract

The invention provides a switching mode power source which comprises a rectification filter (1), a controller (2), a switching tube (3) and a transformer (4), wherein a primary coil (41) of the transformer (4) is connected to one end of the switching tube (3), the other end of the switching tube (3) is connected to the current detection end of the controller (2), the output end of the rectification filter (1) is connected to the power source input end of the controller (2), and the drive waveform output end of the controller (2) is connected to the control end of the switching tube (3). The controller (2) is used for outputting a drive waveform according to the input feedback voltage to control the on-off of the switching tube (3) so as to stabilize voltage or current which is output by asecondary coil (42). An auxiliary coil (43) of the transformer (4) is connected to the voltage input end of the controller (2) to input feedback voltage. Because a method of feeding back voltage fromthe auxiliary coil is adopted, the switching mode power source provided by the invention has the advantages of simple circuit and good loop stability.

Description

technical field [0001] The present invention relates to switched mode power supplies. Background technique [0002] In order to ensure fast and safe charging of the power supply of portable devices, AC-to-DC conversion power modules with high precision, high efficiency and low standby power consumption are required. At present, due to the wide voltage range and high conversion efficiency of the switch mode power supply, it has been widely used in electronic and electrical equipment such as computers and electronic products. [0003] In order to achieve higher voltage and current output accuracy, the existing switch-mode power supplies generally use optocouplers and voltage regulators such as TL431 to perform voltage feedback from the output terminal, and use current-mode PWM on the main side A controller, such as UC3842, controls the switching tube to stabilize the output voltage and current. This approach is often referred to as "output-side" control. [0004] figure 1 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335
Inventor 王蒙杨小华
Owner BYD SEMICON CO LTD