Primary side detection of output voltage in critical discontinuous and discontinuous mode of flyback converter
A flyback converter, critical discontinuous technology, applied in the direction of measuring current/voltage, output power conversion devices, instruments, etc., can solve the problem of insufficient attention to the impact, etc., to improve reliability and stability. Effect
Active Publication Date: 2017-05-10
邳州市景鹏创业投资有限公司
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Problems solved by technology
However, in these proposed schemes, insufficient attention has been paid to the influence of the resonant fall time Td on the sampling point
Method used
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Embodiment 1
[0034] Embodiment 1, Figure 1 to Figure 11 A primary-side detection of the output voltage of the critical discontinuous and discontinuous mode of the flyback converter is given; the basic principle is as follows:
[0035] Accurate 1 / 2 resonance fall time Td, ie Td / 2, is obtained by self-learning the auxiliary (or primary) winding voltage of the flyback power converter operating in critical discontinuous and discontinuous modes. From the formula (1), it can be seen that Td is only related to the excitation inductance L of the primary side M and power switch parasitic capacitance C R related. When the exact Td / 2 is obtained, it will correspond to the auxiliary (or primary) winding voltage V CR The time shift of the waveform by the time shift circuit with controllable time shift is greater than or equal to Td / 2 (such as figure 2 shown). at the corresponding auxiliary (or primary) winding voltage V CR When the waveform drops to zero, the output voltage V of the time-shift ...
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The invention discloses a primary side detection method for output voltage of a flyback converter in critical intermittent and intermittent modes. A self-study module and the like are included. The method comprises the steps that firstly, the self-study module receives auxiliary or primary side winding voltage Vcr, analyzes the waveform of the voltage Vcr and then outputs one-half resonance oscillation fall time Td and a sampling keeping signal CPs / h; secondly, a time shift circuit with controllable time shift receives the auxiliary or primary side winding voltage Vcr, corresponding time shift one-half resonance oscillation fall time Td is conducted on the auxiliary or primary side winding voltage Vcr according to the one-half resonance oscillation fall time Td output by the self-study module, and Vtd is output; thirdly, when the self-study module outputs the sampling keeping signal CPs / h, a sampling circuit conducts sampling keeping on the Vtd output by the time shift circuit with the controllable time shift, and outputs voltage Vs / h; the output voltage Vs / h is the reflection voltage Vo-refl of a primary side winding, and the output voltage Vo of the flyback power converter can be accurately represented through the reflection voltage Vo-refl of the primary side winding.
Description
technical field [0001] The invention relates to power converter topology detection and control in the field of applied electronic technology, in particular to a detection method for the output voltage of a flyback power converter, that is, the critical discontinuous and discontinuous mode output of the flyback converter Voltage primary side detection; that is, through the detection of the primary winding voltage to accurately detect the output voltage of the flyback power converter when it works in critical discontinuous and discontinuous modes. Background technique [0002] Since the flyback power converter has the feature of completing input and output isolation through a low-cost coupled inductance transformer, it is widely used in small and medium power DC-DC and AC-DC applications. The output voltage of the flyback power converter can be detected by the primary detection of its coupled inductance transformer, and the simplification of the feedback circuit composed of op...
Claims
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IPC IPC(8): H02M1/00G01R19/00
Inventor 魏其萃翁大丰李宗兵
Owner 邳州市景鹏创业投资有限公司