Method and device of discharge time of predictive magnetic device for power converter

A technology for discharging signals and circuits, applied in the field of control circuits

Inactive Publication Date: 2007-11-28
SYST GEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

generating a switching signal for regulating a switching regulator

Method used

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  • Method and device of discharge time of predictive magnetic device for power converter
  • Method and device of discharge time of predictive magnetic device for power converter
  • Method and device of discharge time of predictive magnetic device for power converter

Examples

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Embodiment Construction

[0017] Figure 6 shows a switching regulator according to a preferred embodiment of the present invention. A control circuit 100 is used for generating a first switching signal S1 and a second switching signal S2 to control the switching regulator. The second switching signal S2 controls a second switch 20 to provide a lower impedance current path for the inductor 30 (magnetic device) when a discharge current of the inductor 30 (magnetic device) exists. The second switch 20 operates as a synchronous rectifier. An input terminal VI of the control circuit 100 is connected to an input terminal of the switching regulator to receive an input voltage VIN. A program terminal VP of the control circuit 100 has a resistor 70 grounded to program a control signal VS for predicting a discharge time of the inductor 30 and generate the second switching signal S2. The control signal VS can be programmed according to the output voltage VO of the switching regulator. The control circuit 100 h...

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PUM

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Abstract

The invention discloses a predicting method and device of discharge time of magnetic device, which is characterized by the following: a conversion circuit generates a conversion signal and a subsidiary signal; the conversion signal is used to adjust a conversion adjustor; the subsidiary signal is used to control a synchronous rectifier; an estimating circuit responses the input signal and conversion signal to generate a timing signal; the input signal is relative to an input voltage of conversion adjustor; the timing signal cuts the synchronous rectifier, which inhibits the reversing current under light-load and non-load condition.

Description

technical field [0001] The present invention relates to a switching regulator, and more particularly to a control circuit for a switching regulator. Background technique [0002] Switching regulators are used to convert an unregulated power supply to a regulated voltage and / or current source. Figure 1 shows a conventional switching regulator with synchronous rectification. A first switching signal S1 is used to control a duty cycle of a first switch 10 for adjusting voltage and / or current. As shown in FIG. 2 , a current IIN charges an output capacitor 40 during the on time of the switch 10 . FIG. 3 shows a second switching signal S2, which turns on the second switch 20 in response to the first switch 10 being turned off (turn off), and is used to provide a low voltage for a discharge current IF of an inductor 30. impedance path. In continuous current mode (CCM) operation, the first switch 10 is turned on before the energy of the inductor 30 is fully discharged. In disco...

Claims

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Application Information

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IPC IPC(8): H02M3/07
Inventor 杨大勇
Owner SYST GEN
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