Control architecture for interleaved converters
First Claim
1. A control system for a converter circuit producing an output voltage from an input line voltage, the converter circuit including a rectifying circuit, and two interleaved converter circuits, each interleaved converter circuit including a switch, the control system comprising:
- a) a current sensing circuit including two current loops each of the two loops coupled to one of the two interleaved converter circuits to sense the current in each switch;
b) a voltage feedback control circuit including a voltage loop for sensing the output voltage of the converter circuit; and
c) 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 and to provide power factor corrections for the input line voltage.
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Accused Products
Abstract
A control system for an converter circuit using two interleaved boost circuits is described which uses a single PWM controller to control the switches in both of the interleaved boost circuits. A voltage feedback control circuit monitors the output voltage of the converter circuit and sends that information to the PWM controller. A current sensing circuit is provided that senses the current in each of the boost converters. The current sensed in the current sensing circuit is converted to a voltage and used in conjunction with the voltage information from voltage feedback control circuit by the single PWM controller to regulate both of the boost converter switches. By regulating the boost converter switches, the single PWM controller is able to ensure proper synchronization and current sharing while tightly regulating the output voltage and improving the input power factor of the converter circuit.
76 Citations
14 Claims
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1. A control system for a converter circuit producing an output voltage from an input line voltage, the converter circuit including a rectifying circuit, and two interleaved converter circuits, each interleaved converter circuit including a switch, the control system comprising:
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a) a current sensing circuit including two current loops each of the two loops coupled to one of the two interleaved converter circuits to sense the current in each switch; b) a voltage feedback control circuit including a voltage loop for sensing the output voltage of the converter circuit; and c) 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 and to provide power factor corrections for the input line voltage. - View Dependent Claims (2, 3, 4, 5)
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6. A converter circuit producing an output voltage from a dc input voltage of limited range comprising:
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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. - View Dependent Claims (7, 8, 9, 10)
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11. A converter circuit producing an output voltage from a dc input voltage of limited range comprising:
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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. - View Dependent Claims (12, 13, 14)
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Specification