Method and controller for inhibiting transformer dc magnetic bias
A technology of transformers and controllers, which is applied in the direction of conversion equipment with intermediate conversion to AC, conversion of AC power input into DC power output, irreversible DC power input conversion into AC power output, etc., which can solve the problem of increasing the excitation current of the transformer , Transformer primary copper loss increases, converter efficiency is not high, etc.
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[0031] The principle of the invention is to obtain the DC component signal corresponding to the primary of the transformer through transient current detection, and to adjust the duty ratio of the power switching element transiently through fast processing, thereby suppressing the DC component of the primary of the transformer.
[0032] The working principle of the present invention is analyzed as follows:
[0033] image 3 It is a block diagram of the DC component suppression control in the preferred embodiment of the present invention. The A signal in the figure is the preprocessed signal of the sampling result (or part of the sampling result). It can basically reflect the positive and negative asymmetry of the primary current of the transformer. The B signal is the result of integrating the A signal. It is compared with the sum of the compensation signal C (D signal) and the error operational amplifier output E of the control loop of the traditional circuit. The comparator...
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