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Flyback power supply circuit and its secondary side control circuit

A power supply circuit and flyback technology, which is applied in the direction of control/regulation systems, electrical components, and adjustment of electrical variables, etc.

Active Publication Date: 2019-12-03
RICHTEK TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the deficiencies and defects of the prior art, and propose a flyback power supply circuit and its secondary side control circuit, which can effectively suppress the capacitive coupling effect of the parasitic capacitance CP in the prior art, but will not Lead to problems such as cost increase or loss of efficiency

Method used

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  • Flyback power supply circuit and its secondary side control circuit
  • Flyback power supply circuit and its secondary side control circuit
  • Flyback power supply circuit and its secondary side control circuit

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Embodiment Construction

[0072] The drawings in the present invention are all schematic, mainly intended to show the coupling relationship between various circuits, and the relationship between various signal waveforms. As for the circuits, signal waveforms and frequencies, they are not drawn to scale.

[0073] see image 3 , shown in the figure is an embodiment of the flyback power supply circuit of the present invention (flyback power supply circuit 3), the flyback power supply circuit 3 includes a transformer 10, a power switch N1, a synchronous rectifier (synchronous rectification, SR) switch N2 and a secondary side control circuit 20 . The transformer 10 has a primary winding W1 for receiving an input voltage VIN; and a secondary winding W2 for generating an output voltage VOUT. The power switch N1 is coupled to the primary winding W1, and the conduction time of the primary winding W1 can be controlled by a primary control circuit (not shown) such as but not limited to PWM. A synchronous rectif...

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PUM

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Abstract

A flyback power supply circuit and a secondary-side control circuit thereof are provided. The flyback power supply circuit for converting an input voltage to an output voltage includes a transformer,a power switch, a synchronous rectifier (SR) switch, and a secondary-side control circuit. The secondary-side control circuit controls the SR switch to be ON when the power switch is OFF. The secondary-side control circuit includes a driving switch for controlling the SR switch, a synchronous control circuit which controls the driving switch to operate the SR switch, and a clamping circuit including a clamping switch and a clamping switch control circuit. The clamping switch control circuit controls the clamping switch according to a current inflow terminal voltage of the clamping switch and / or the voltage related to the output voltage, such that, during a secondary side power-on period, an equivalent impedance of the current inflow terminal of the clamping switch is smaller than a predetermined clamping impedance.

Description

technical field [0001] The invention relates to a flyback power supply circuit, in particular to a flyback power supply circuit which has a secondary-side synchronous rectification switch and can suppress the parasitic capacitive coupling of the synchronous rectification switch. The invention also relates to a secondary side control circuit used in a flyback power supply circuit. Background technique [0002] Figure 1A A common prior art flyback power supply circuit (flyback power supply circuit 1) is disclosed, wherein the transformer 10 has a primary side winding W1 to receive an input voltage VIN; the power switch N1 controls the primary side winding W1 conduction time, and the output voltage VOUT is generated by the conversion of the secondary side winding W2; in order to improve the conversion efficiency, the secondary side includes a synchronous rectification (synchronous rectification, SR) switch N2, which is coupled to the secondary side winding W2 for Control the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335
CPCH02M3/33592
Inventor 唐健夫林素圆李一惟陈曜洲
Owner RICHTEK TECH
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