Control architecture for interleaved converters

A converter circuit producing an output voltage from a dc input voltage of limited range comprising:

• a) two interleaved converter circuits, each interleaved converter circuit including a switch used to control the operation of the interleaved converter circuit;
• b) an output capacitor connected to the output of the two interleaved converter circuits to store energy and to filter switching ripples from the output voltage;
• c) a current sensing circuit including two current loops, each current loop coupled to one of the interleaved converter circuits to sense the current in each switch;
• d) a voltage feedback control circuit sensing the output voltage of the converter circuit;
• and
• e) a single controller connected to both switches, the single controller responsive to the output voltage sensed by the voltage feedback control circuit and the current in each switch sensed by the current sensing circuit and operative to control the duty cycle of the switches in order to tightly regulate the output voltage.

A converter circuit producing an output voltage from a dc input voltage of limited range comprising:

• a) two interleaved boost circuits connected in parallel between the dc input voltage and the load, wherein each boost circuit includes an inductor connected to the dc input voltage, a diode connected between the inductor and a load, and a switch connected between the junction of the inductor and the diode and ground, each switch used to control the operation of the boost circuit;
• b) an output capacitor connected to the output of the boost converters to store energy and filter switch ripple from the output voltage;
• c) a current sensing circuit including two current loops magnetically coupled to each of the boost circuits to sense the current in each switch, the current sensing circuit producing a voltage indicative of the current in the boost circuits;
• d) a current amplifying and filtering circuit connected to the current sensing circuit and operable to filter and amplify the voltage indicative of the current in the boost circuits;
• e) a voltage feedback control circuit sensing the output voltage of the converter circuit;
• and
• f) a single controller connected to both switches, the single controller responsive to the output voltage sensed by the voltage feedback control circuit and the voltage indicative of the current each boost circuit, the single controller operative to control the duty cycle of the switches in order to tightly regulate the output voltage and improve the power factor of the input voltage.