| 摘要 |
PROBLEM TO BE SOLVED: To dispense with an expensive output filter and to attain an accurate output tracking operation by feeding the output of an H bridge driver circuit back to its input and applying the summing integration to the output, to obtain a control signal and also making an integrator function as a filter. SOLUTION: The signals are fed back to an input node 41 via a differential amplifier 40 from output terminals 20 and 22 of a driver circuit 24, consisting of an H-bridge such as a single comparator pwm(pulse width modulation) amplifier. Then the signals fed back to the node 41 are added to an input signal and inputted to an integration error amplifier 42. An integrated signal CTL+ and a complementary signal CLT- are generated by an inverter 14, and a control signal CTL±is obtained. At the same time, the amplifier 42 smoothes the pulse-type waveforms of signals CTL through the reconfiguration filtering. The signals CTL are supplied to the compactors 12 and 16, together with the modulating reference triangular wave signals. Then the output pwm and the complementary driver signal generated by the inverter 14 are supplied to a gate driver circuit 18. Thus, accurate input and output tracking operations are carried out without requiring expensive output filter.
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