US6534960B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-channel interleaved power converter with current sharing
Assignee: Texas Instruments Inc
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Filing: 2002-06-18
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Granted: 2003-03-18
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Expires: 2022-06-18
Abstract
Abstract A multi-channel interleaved power converter includes first and second per-channel conversion circuits, each including a pulse width modulator (PWM), a driver PWM, an output inductor carrying load current, and a current controlled current source (CCCS) coupled to sense the inductor current. The inductors of the different channels are coupled in common to an output node of the power converter. Summing circuitry is operative (i) to subtract the output current of the second channel CCCS from the output current of the first channel CCCS, (ii) to convert the difference current into an offset, and (iii) to apply the offset to a first PWM control signal to generate a second PWM control signal for the second channel. The PWM control signals cause respective currents to be established in the inductors of the different channels according to a predetermined desired current relationship, such as equality.
Inventors
- 👤 James Edward Wells
- 👤 Norbert James Hepfinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:26
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/10; H02M3/145; H02M3/155; H02M3/156; H02M3/158; H02M3/1584
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
167 words
A multi-channel interleaved power converter, comprising: first and second per-channel circuits, each including (1) a pulse width modulator (PWM), (2) a driver coupled to the PWM, (3) an inductor coupled to the driver, and (4) a current controlled current source (CCCS) having an input coupled to sense the current in the inductor, the respective inductors of the per-channel circuits being coupled in common to an output node of the power converter; and current summing circuitry operative (i) to subtract the output current of the CCCS of the second per-channel circuit from the output current of the CCCS of the first per-channel circuit, (ii) to convert the difference current into a corresponding offset, and (iii) to apply the offset to a first PWM control signal to generate a second PWM control signal for the second per-channel circuit, the second PWM control signal of the second channel being generated such that respective currents are established in the inductors of the per-channel circuits according to a predetermined desired current relationship.
Claim 2
Dependent Claim
167 words
A multi-channel interleaved power converter, comprising: first and second per-channel circuits, each including (1) a pulse width modulator (PWM), (2) a driver coupled to the PWM, (3) an inductor coupled to the driver, and (4) a current controlled current source (CCCS) having an input coupled to sense the current in the inductor, the respective inductors of the per-channel circuits being coupled in common to an output node of the power converter; and current summing circuitry operative (i) to subtract the output current of the CCCS of the second per-channel circuit from the output current of the CCCS of the first per-channel circuit, (ii) to convert the difference current into a corresponding offset, and (iii) to apply the offset to a first PWM control signal to generate a second PWM control signal for the second per-channel circuit, the second PWM control signal of the second channel being generated such that respective currents are established in the inductors of the per-channel circuits according to a predetermined desired current relationship.
Claim 3
Dependent Claim
117 words
A power converter according to claim 1 , wherein for each per-channel circuit: (1) the driver comprises a first switching transistor between a supply node and the inductor, the first switching transistor having an ON time and an OFF time determined by the PWM circuit, and (2) the CCCS comprises a second switching transistor between the inductor and a ground node, the second switching transistor being operative to be ON when the first switching transistor is OFF, the second switching transistors of the per-channel circuits having respective ON resistances according to a predetermined resistance relationship, and (3) the CCCS detects the current in the inductor as a voltage across the second switching transistor during its ON time.
Claim 4
Dependent Claim
36 words
A power converter according to claim 2 , wherein the CCCS of each per-channel circuit includes an amplifier and a voltage-to-current converter, the amplifier being enabled only during the ON time of the second switching transistor.
Claim 5
Dependent Claim
56 words
A power, converter according to claim 1 , wherein the current summing circuitry includes a capacitor, one terminal of the capacitor being coupled to the first PWM control signal and the other terminal being coupled to the respective outputs of both the CCCS of the first per-channel circuit and the CCCS of the second per-channel circuit.
Claim 6
Dependent Claim
43 words
A power converter according to claim 1 , further comprising voltage control circuitry operative to generate the first PWM control signal based on the difference between the output voltage of the power converter and a predetermined desired output voltage of the power converter.
Claim 7
Dependent Claim
43 words
A power converter according to claim 5 , wherein the voltage control circuitry comprises an integrating differential amplifier having an output representing the integrated difference between the actual output voltage of the power converter and the desired output voltage of the power converter.
References Cited (Backward Citations)
US5861734A
Cited
US5870296A
Cited
US6111440A
Cited
US6215290B1
Cited
US6404175B1
Cited
US6433527B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2006-03-17 | 2006-09-16 | 2007-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-03-17 | 2010-09-16 | 2011-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-03-17 | 2014-09-16 | 2015-03-18 | $7700.00 | Window Closed / Lapsed |