Abstract: Control means is provided, in which the whole of the phase difference of a power waveform of each phase is matched to a value dividing a cycle of the power waveform into n-equal portions, and at the same time, the whole of the power value of each phase is controlled to be identical, so that the power conversion unit having a n-alternating current output (n is an integer numeral serving as n?2) connected to the direct current power source and smoothing means provided between the direct current power source and the power conversion unit are made small in capacity.

Abstract: An adder 11 outputs a signal VS indicating a value of (Vr?Vo), and a multiplier 12 outputs a control signal GS indicating a value of G(Vr?Vo) on the basis of the signal VS. An adder 13 outputs a signal HS on the basis of the control signal GS and a signal FS outputted from an operation circuit 30, and a PWM signal generating circuit 20 generates a PWM signal KS on the basis of the signal HS and a ramp signal RS outputted from a ramp signal circuit 15, and outputs this signal KS to a switching power supply. A counter 14 counts an on time of the PWM signal KS and retains a count value at a time of receiving a sample signal SMP. The operation circuit 30 has a high-pass filter 31 and an integrator 32, performs an operation based on a signal DS indicating the count value outputted from the counter 14, and outputs the signal FS after the operation.

Abstract: A synchronous buck converter manufacturable as an MCM having an output current sensing circuit. The device employs MOSFETS as the switching transistors, and a sensing circuit including a sampling switch operated synchronously on and off with the shunt MOSFET, a variable gain amplifier, the sampling switch being coupled to provide a signal to the variable gain amplifier representing the voltage across the RDS-ON of the shunt MOSFET, and a circuit, e.g., an RC circuit, associated with the variable gain amplifier implementing a low pass filter whereby the output of the variable gain amplifier is substantially independent of the value of the inductor and the magnitude of any time varying component of the signal input to the sampling switch. When the device is packaged an MCM, the current sense circuit gain can be trimmed based on the RDS-ON value.