Flyback converter and power supply system

A flyback converter and circuit technology, applied in control/regulation systems, instruments, DC power input conversion to DC power output, etc., to achieve the effects of reducing difficulty, suppressing output cross-adjustment, and facilitating matching

Active Publication Date: 2014-05-14
HUAWEI DIGITAL POWER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Embodiments of the present invention provide a flyback converter and power supply system to solve the problem of cross-regulation between output winding

Method used

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  • Flyback converter and power supply system
  • Flyback converter and power supply system
  • Flyback converter and power supply system

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0025] Example one

[0026] figure 1 It is a circuit diagram of the secondary side circuit of the flyback converter provided in the first embodiment of the present invention, such as figure 1 As shown, the flyback converter includes a primary circuit and a secondary circuit, wherein the secondary circuit includes four output circuits, and each output circuit includes a first secondary winding N S , The second secondary winding L S , Secondary winding output leakage inductance L Sσ , Series inductance L, rectifier tube D S , Output capacitor C S And resistance R L .

[0027] Taking the first output circuit as an example, the first secondary winding N S1 , The second secondary winding L S1 , Secondary winding output leakage inductance L S1σ , Series inductance L 1 , Rectifier D S1 With output capacitor C S1 In series, the output capacitor C S1 With this resistance R L1 In parallel, the resistance R L1 One end connected to output voltage V o1 , The resistance R L1 The other end is gr...

Example Embodiment

[0029] Example two

[0030] figure 2 This is a circuit diagram of the secondary side circuit of the flyback converter provided in the second embodiment of the present invention. The secondary side circuit of the flyback converter provided in this embodiment is based on the previous embodiment. If there are two output circuits of output voltage V o Common ground, and the output voltage of the first output circuit of the two output circuits V o Higher than the output voltage V of the second output circuit o , Then the first secondary winding N of the first output circuit S The negative terminal is connected to the rectifier tube D of the second output circuit S The cathode of the first output circuit is eliminated by using DC superposition technology.

[0031] The following takes the third output circuit and the fourth output circuit as examples for explanation, such as figure 2 As shown, the output voltage of the third output circuit V o3 And the output voltage V of the fourth outpu...

Example Embodiment

[0033] Example three

[0034] image 3 This is a circuit diagram of the primary side circuit of the flyback converter provided in Embodiment 3 of the present invention. The flyback converter of this embodiment is based on Embodiment 1 or Embodiment 2. The primary side circuit is an active clamping circuit, including Primary winding N P , Primary inductance L P , The original leakage inductance L Pσ , Switch tube (S P1 , S P2 ), capacitance C P , Rectifier tube (D P1 , D P2 ) And resistance R, the switch tube S P2 With rectifier tube D P2 Parallel with capacitor C P The active clamp circuit 300 is formed in series, and the primary winding N P , Primary inductance L P And the original leakage inductance L Pσ After connecting in series and paralleling the active clamp circuit 300, one end is connected to the input voltage V in , One end is in turn with the switch tube S P1 With rectifier tube D P1 The parallel circuit and the resistor R are connected in series.

[0035] image 3 Mid...

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PUM

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Abstract

An embodiment of the invention provides a flyback converter and a power supply system. The flyback converter comprises a primary side circuit and a secondary side circuit, wherein the secondary side circuit comprises two or more output circuits. Each output circuit comprises a first secondary side winding, a second secondary side winding, a secondary side winding output leakage inductor, a series inductor, a rectifier tube, an output capacitor and a resistor, wherein the first secondary side winding, the second secondary side winding, the secondary side winding output leakage inductance, the series inductor and the rectifier tube are connected with the output capacitor serially, the output capacitor is connected with the resistor parallelly, one end of the resistor is connected with output voltage, the other end of the resistor is connected with the ground, and the series inductor is of a magnetic integration structure. Therefore, output cross regulation of the flyback converter is inhibited, and difficulty in inductor matching, design and manufacture is reduced.

Description

technical field [0001] Embodiments of the present invention relate to power electronics technology, in particular to a flyback converter and a power supply system. Background technique [0002] In low-power applications, flyback converters are widely used in the industry. Because flyback converters have the characteristics of wide input voltage range, fewer components, low cost, and isolation between output and input, they are often used in applications that require multiple outputs. . [0003] The flyback converter takes the primary and secondary sides of the isolation transformer as the boundary, and can be divided into two parts: the primary circuit and the secondary circuit. The primary side circuit mainly includes transformer primary side inductance, power switch tube and primary side leakage inductance energy processing circuit. The secondary circuit mainly includes a secondary inductor, a rectifier circuit and a filter circuit. Among them, the leakage inductance of...

Claims

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Application Information

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IPC IPC(8): H02M3/335
Inventor 胡智伦郭文康
Owner HUAWEI DIGITAL POWER TECH CO LTD
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