Systems for auto-interleaving synchronization in a multiphase switching power converter
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G05F-001/40
G05F-001/10
출원번호
US-0238311
(2005-09-29)
발명자
/ 주소
Brooks,Steven W.
Pickle,Paul
출원인 / 주소
Microsemi Corporation
대리인 / 주소
Knobbe, Martens, Olson &
인용정보
피인용 횟수 :
31인용 특허 :
56
초록▼
A plurality of single-phase synchronizing converter automatically synchronize on a peer-to-peer basis. Each synchronizing converter is configured as a DC-to-DC converter. The synchronizing converters operate in parallel as a multi-phase converter. A common bus between the synchronizing converters in
A plurality of single-phase synchronizing converter automatically synchronize on a peer-to-peer basis. Each synchronizing converter is configured as a DC-to-DC converter. The synchronizing converters operate in parallel as a multi-phase converter. A common bus between the synchronizing converters includes a sync line and a common phase control line. Proper phasing automatically occurs when power is applied, and the phasing changes automatically as converters are added or removed. When the system powers up, the converters arbitrate for phase position. The phasing positions are random, but the phasing is relatively symmetrical regardless of the number of phases. Preferably, a hot-swappable converter module can be plugged into any location of a parallel multiphase bus to produce a common output voltage. When an additional module is plugged in, the converters readjust their phases to maintain phase symmetry. Preferably, each module shares a substantially equal portion of the output load.
대표청구항▼
What is claimed is: 1. A power supply system comprising: a first converter comprising: a first inductor having an input terminal and an output terminal; and a first switch circuit coupled to a first voltage source and to the input terminal of the first inductor; a second converter comprising: a se
What is claimed is: 1. A power supply system comprising: a first converter comprising: a first inductor having an input terminal and an output terminal; and a first switch circuit coupled to a first voltage source and to the input terminal of the first inductor; a second converter comprising: a second inductor having an input terminal and an output terminal directly coupled to the output terminal of the first inductor; and a second switch circuit coupled a second voltage source and to the input terminal of the second inductor; and at least one controller to control operations of the first switch circuit and the second switch circuit, the at least one controller configured to alternately connect the input terminals of the respective first and second inductors to the respective voltage source, the at least one controller configured to adjust duty cycles of respective voltage waveforms across the respective first and second inductors to achieve substantially equal sensed voltages representative of respective voltages at the input terminals of the first and second inductors, the at least one controller further configured to adjust a phase of operation of the respective first and second switch circuits to achieve approximate phase symmetry. 2. The power supply system of claim 1, wherein the voltages at the respective input terminals of the first and second inductors are low-pass filtered to produce the respective sensed voltages. 3. The power supply system of claim 2, wherein the first and second switch circuits are implemented by metal-oxide-semiconductor-field-effect-transistors. 4. The power supply system of claim 2, wherein: the first controller comprises a control voltage circuit and at least two pulse-width modulation circuits; and the control voltage circuit produces control voltages to control duty cycles of respective outputs of the respective pulse-width modulation circuits. 5. The power supply system of claim 4, wherein the control voltage circuit further comprises: an error amplifier configured to compare a feedback voltage proportional to an output voltage with a reference voltage; a first feedback amplifier configured to buffer an output of the error amplifier and provide a first control voltage; an offset amplifier configured to compare a first sensed voltage with a second sensed voltage; and a second feedback amplifier configured to sum an output of the offset amplifier with an output of the error amplifier and provide a second control voltage. 6. The power supply system of claim 5, wherein: the error amplifier and the offset amplifier are integrating amplifiers; and the feedback amplifiers are unity gain amplifiers. 7. The power supply system of claim 1, wherein the first switch circuit and the second switch circuit are each directly coupled to only one inductor. 8. The power supply system of claim 1, further comprising a common phase control line coupling the first and second converters, wherein the common phase control line carries at least one of time information and amplitude information. 9. The power supply system of claim 8, further comprising a common sync line coupling the first and second converters, wherein the common sync line provides start of cycle information to the power supply system. 10. A power supply system comprising: a loadshare bus configured to sum a first filtered voltage and a second filtered voltage to produce a sum voltage; a first converter comprising: a first output inductor, the first output inductor comprising an input side and a load side; a first filter configured to sense a voltage on the input side of the first output inductor to produce the first filtered voltage; and a first feedback loop configured to control an output current of the first converter, the first feedback loop offset by a first offset amount according to the sum voltage; and a second converter comprising: a second output inductor, the second output inductor comprising an input side and a load side directly coupled to the load side of the first output inductor; a second filter configured to sense a voltage on the input side of the second output inductor to produce the second filtered voltage; and a second feedback loop configured to control an output current of the second converter, the second feedback loop offset by a second offset amount according to the sum voltage, the first and second offset amounts configured to balance output current provided by the first converter and the second converter. 11. The power supply system of claim 10, wherein at least one of said first and second filters is a low-pass filter. 12. The power supply system of claim 11, wherein each of the first and second converters has only a single inductor coupled to the respective first and second filters. 13. The power supply system of claim 10, further comprising a third converter comprising a third output inductor and a third filter configured to sense a voltage on an input side of the third output inductor to produce a third filtered voltage. 14. The power supply system of claim 13, wherein the loadshare bus is further configured to sum the first filtered voltage, the second filtered voltage and the third filtered voltage to produce the sum voltage. 15. A power supply system comprising a first single-phase synchronizing converter that produces output power having a first phase, the first single-phase synchronizing converter synchronized with at least one other single-phase power converter to produce phase symmetry between the first phase and a phase of the at least one other single-phase power converter, the first single-phase synchronizing converter comprising: a voltage feedback loop to control a duty cycle of the first single-phase synchronizing converter to produce an output voltage level according to a voltage reference; and a loadshare bus input configured to provide an offset voltage to the feedback loop to offset the duty cycle, the loadshare bus configured to carry a sum of filtered sensed voltages from the first single-phase synchronizing converter and one or more additional single-phase synchronizing converters provided to the loadshare bus. 16. The power supply system of claim 15, wherein the first single-phase synchronizing converter is provided to a sync line and to a common phase control line. 17. The power supply system of claim 16, wherein the first single-phase synchronizing converter provides a pulse to the common phase control line, the pulse indicating a phase of the single-phase synchronizing converter. 18. The power supply system of claim 15, wherein the single-phase synchronizing converter comprises a feedback loop to control the first phase by adjusting the first phase to fall between a previous power pulse produced by a first peer of the single-phase synchronizing converter and a subsequent power pulse produced by a second peer of the single-phase synchronizing converter. 19. The power supply system of claim 15, wherein each of the first single-phase synchronizing converter and the at least one other single-phase power converter further comprises an output inductor, and wherein output sides of the output inductors are directly coupled to each other. 20. The power supply system of claim 15, wherein the filtered sensed voltages comprise low-pass filtered sensed voltages.
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