Method and controller for inhibiting transformer dc magnetic bias
A transformer and controller technology, which is applied to the conversion equipment with intermediate conversion to AC, the conversion of AC power input to DC power output, and the conversion of irreversible DC power input to AC power output, etc., can solve the problem of increasing the excitation current of the transformer. , the increase of primary copper loss of the transformer, the low efficiency of the converter, etc.
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[0031] The principle of the present invention is to obtain the DC component signal corresponding to the primary of the transformer through transient current detection, and through fast processing, the duty ratio of the power switching element is transiently adjusted, thereby suppressing the DC component of the transformer primary.
[0032] Principle of work of the present invention is analyzed as follows:
[0033] Fig. 3 is a block diagram of DC component suppression control in a preferred embodiment of the present invention. The signal A in the figure is the signal after the sampling result (or part of the sampling result) is preprocessed. 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 outpu...
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