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Digital dynamic lag type detection device and method of flyback power converter

A power converter and dynamic delay technology, applied in the direction of output power conversion devices, instruments, electrical components, etc., can solve the problems of increasing the difficulty of design and the inability to make variable current sources.

Inactive Publication Date: 2012-01-11
POWER FOREST TECH
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  • Abstract
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Problems solved by technology

However, in the technology disclosed in this patent, the delay time is realized through the current source 230 and the capacitor 235. In practice, this structure has many simulation errors; Variable current source, capacitor 235 and comparison voltage V Y The deviation (offset), and these simulation errors will be more serious in the advanced process, increasing the difficulty of design

Method used

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  • Digital dynamic lag type detection device and method of flyback power converter
  • Digital dynamic lag type detection device and method of flyback power converter
  • Digital dynamic lag type detection device and method of flyback power converter

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Embodiment Construction

[0046] Please refer to Figure 6 , is a schematic diagram of the application of the digital dynamic delay detection device in a preferred embodiment of the present invention. The digital dynamic delay detection device 100 of the preferred embodiment of the present invention is applied in a control chip of a flyback power converter, and the control chip is electrically connected to an auxiliary winding N of a transformer A and a switching switch Q1. The digital dynamic delay detection device 10 measures the auxiliary winding N A On voltage signal V A The extreme value (peak or trough) of , to determine the gate voltage controlling the switching switch Q1. The control chip also includes other units, such as a feedback control unit, or a unit that provides switching control signals to the switching switch Q1 , but this is the prior art, so it will not be repeated here.

[0047] see Figure 7 , which is a schematic diagram of the application of the digital dynamic delay detec...

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Abstract

The invention discloses a digital dynamic lag type detection device and method of a flyback power converter. The detection method comprises the following steps of: receiving a first input voltage signal of a flyback power converter, referencing a critical voltage so as to determine whether to begin to count; if reaching a counting beginning condition, counting a preset built-in frequency; after the counting is finished, sending out a first output signal so as to switch a switch of the flyback power converter; after the switch is switched, detecting the slope factor of the current first input voltage signal so as to determine the adjusting numerical value of the preset built-in frequency. The preset built-in frequency and the adjusting numerical value are integers, and the delay time can be precisely controlled in a numerical implementing way.

Description

technical field [0001] The invention relates to a power electronic application technology, in particular to a valley detector technology and method in a quasi-resonant flyback power converter (QR Flyback). Background technique [0002] In current power electronics technology, flyback power converters are widely and widely used in low-power power conversion applications due to their low cost and simple structure. Among them, the quasi-resonant flyback power converter can improve the system efficiency without increasing the system complexity and components. Therefore, the quasi-resonant flyback power converter has the advantage of taking into account both economic benefits and environmental protection demands. [0003] figure 1 is a block diagram of an existing flyback power supply, while figure 2 for figure 1 Schematic diagram of the working waveform. Those skilled in the art should know that when the secondary side coil N S After the inductive energy is transferred, th...

Claims

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Application Information

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IPC IPC(8): H02M3/335
Inventor 曾任辉李建和
Owner POWER FOREST TECH
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