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Negative lock loop of fly-back voltage converter and control method

A technology of voltage converters and control methods, applied in control/regulation systems, output power conversion devices, instruments, etc.

Active Publication Date: 2010-06-16
RICHTEK TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Therefore, there are above-mentioned inconveniences and problems between the peak value Is_pk of the known current Is and the relationship between the current conduction time toff

Method used

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  • Negative lock loop of fly-back voltage converter and control method
  • Negative lock loop of fly-back voltage converter and control method
  • Negative lock loop of fly-back voltage converter and control method

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Embodiment Construction

[0057] The present invention will be further described below in conjunction with embodiment and accompanying drawing.

[0058] Figure 4The negative lock circuit 40 applied to the flyback voltage converter 10 is shown, wherein the charge and discharge control circuit 42 controls the charge and discharge of the capacitor CN1 according to the charge signal Sc and the discharge signal Sdc to generate a voltage Vw1, and the charge and discharge control circuit 42 includes a current source 4202 And 4208 and switches 4204 and 4206, current source 4202, switch 4204 and capacitor CN1 are connected in series, current source 4208 is connected in parallel with capacitor CN1, switch 4206 is connected in series with current source 4208, charging signal Sc and discharging signal Sdc respectively control switches 4204 and 4208 , the current source 46 generates a charging current ix according to the voltage Vw1, the current source 46 includes a voltage-to-current converter 4602 and a current ...

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Abstract

The invention relates to a negative lock loop of a fly-back voltage converter, wherein the fly-back voltage converter comprises a transformer and a first switch, the transformer is provided with a primary side coil and a secondary side coil, and the first switch is connected with the primary side coil; and the negative lock loop comprises a current source, a capacitor, a second switch, a third switch, a comparer and a logic circuit. The negative lock loop is characterized in that the current source is used for supplying a first current for deciding the peak value of a second current of the secondary side coil; the capacitor is arranged in the negative lock loop; the second switch is connected between the current source and the capacitor and is controlled by a first frequency; the third switch is connected with the capacitor in parallel and is controlled by a second frequency; the comparer is connected with the capacitor and is used for comparing voltage and a second critical value on the capacitor to generate a comparison signal; and the logic circuit is connected with the comparer and is used for regulating the first current according to the comparison signal, the first frequency and the second frequency.

Description

technical field [0001] The present invention relates to a flyback voltage converter, in particular to a negative lock loop and a control method of the flyback voltage converter. Background technique [0002] figure 1 A known flyback voltage converter 10 is shown, wherein a bridge rectifier 12 is used to convert an AC input voltage VAC to a DC input voltage VIN, a transformer 16 includes a primary coil Lp, a secondary coil Ls and an auxiliary coil La, a switch SW is connected to the primary side coil Lp, and the controller 14 switches the switch SW to convert the DC input voltage VIN into the output voltage VOUT. figure 2 show figure 1 The waveform of the medium signal, wherein the waveform 20 is the current Id on the secondary side coil Ls, and the waveform 22 is the voltage Vds on the secondary side coil Ls. image 3 It shows the peak value Is_pk of the current Is and the current conduction time toff when the current on the secondary side coil Ls is greater than zero, w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
Inventor 庄朝炫杨景翔范振炫周宏哲
Owner RICHTEK TECH