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Control circuit and control method

A technology of control circuit and control method, which is applied in the direction of control/regulation system, electrical components, and adjustment of electric variables, etc., and can solve problems such as high power loss

Active Publication Date: 2016-09-07
SYST GEN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Existing active clamping circuits can only achieve ZVS under certain load conditions
Also, high circulating currents during light loads lead to higher power loss issues

Method used

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  • Control circuit and control method
  • Control circuit and control method

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Embodiment Construction

[0105] In order to make the above-mentioned objects, features and advantages of the present invention more comprehensible, a preferred embodiment will be described in detail below together with the accompanying drawings.

[0106] figure 1 A flyback power converter according to an embodiment of the present invention is shown. Transformer 10 receives the input voltage V of the power converter IN . Transistor (also referred to as “low-side transistor”) 20 is coupled to switch primary side winding N of transformer 10 P . The controller 100 generates a switching signal S at its terminal S1 1 , while the switching signal S 1 used to drive transistor 20 to adjust the output voltage of the power converter V O . switch signal S 1 is based on the feedback signal V at the terminal FB of the controller 100 FB And generated. Feedback signal V FB with the output voltage of the power converter V O Associated. The secondary side winding N of the transformer 10 S The output volta...

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Abstract

A control circuit and a control method. The control method is used to control the active clamp flyback power converter. The control method includes the steps of: generating a switching signal based on the feedback signal to switch the low-side transistor and regulate the output of the active-clamp flyback power converter; generating the active-clamping signal after the switching signal is disabled; generating a hysteretic bias to adjust the feedback signal; and periodically generate a pulse signal to enable the switching signal. The low-side transistor switches the transformer. The switching signal drives the low-side transistor. The active clamping signal is used to drive the high-side transistor. The pulse width of the active clamp signal is determined by the first resistor. A high-side transistor is connected in series with a capacitor to form an active clamp circuit. Under heavy load conditions, the minimum frequency of the switching signal is determined by the second resistor.

Description

technical field [0001] The invention relates to an active clamping flyback power converter, in particular to a control circuit for the active clamping flyback power converter. Background technique [0002] Existing active clamping circuits can only achieve ZVS under certain load conditions. Furthermore, high circulating currents during light loads lead to higher power loss issues. Related techniques can be found in US Patent No. 5,570,278 entitled "ClampedContinuous Flyback Power Converter", US Patent No. 6,069,803 entitled "OffsetResonance Zero Voltage Switching Flyback Converter" and "Active-clamp Circuit for Quasi-resonant Flyback Power ConverterPower Converter" and No. 20110305048 US patent application. Contents of the invention [0003] Therefore, the present invention proposes a control circuit for actively clamping a flyback power converter. It achieves zero voltage switching at heavy loads and high efficiency at light loads. The purpose of the present invention...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335
Inventor 杨大勇刘晏铭
Owner SYST GEN
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