US6166455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Load current sharing and cascaded power supply modules
Assignee: Semiconductor Components Industries LLC
•
Filing: 1999-01-14
•
Granted: 2000-12-26
•
Expires: 2019-01-14
Abstract
Abstract A modular power supply which distributes responsibility for supplying current to a load among two or more power supply modules having a common output node. One of the power supply modules which supplies the lowest level of current to the load functions as the master while the remaining power supply modules each function as a slave. A load share bus which interconnects all the power supply modules is driven by the master with a signal representative of the level of current supplied by the master. Each slave module attempts to reduce its output current to a level which is a predetermined offset above the level of current supplied by the master while a regulated voltage is maintained at the common output node. Any one of the modules can become the master, though once the system is operating, the predetermined offset generally prevents the roles from changing. Should one of the power supply modules fail such that its output current is uncontrolled, this power supply module will not be the master. According to an aspect of the invention, a power supply module can be inserted when there are already other power supply modules present and actively supplying power to the load. According to another aspect of the invention, rather than providing a common load share bus, a plurality of power supply modules are cascaded in a line, a loop a tree. Each module, however, supplies power to a load via a common output terminal.
Inventors
- 👤 Thomas Li
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:09
CPC Classifications
H; H02; H02J; H02J1/00; H02J1/10; H02J1/102; H02J1/001
Claims Analysis
Total Claims: 46
Claim 1
Independent Claim
112 words
A method of supplying power to a load, the method comprising steps of: a. providing a plurality of power supply modules each coupled to a common output node for supplying a respective output current to the load; and b. selecting one of the plurality of power supply modules as master by determining which of the plurality of power supply modules supplies a lowest level of current to the load wherein the remaining one or more of the plurality of power supply modules assume the role of slaves wherein each slave adjusts its respective output current to a level that is a predetermined amount above a level of current supplied by the master.
Claim 2
Independent Claim
112 words
A method of supplying power to a load, the method comprising steps of: a. providing a plurality of power supply modules each coupled to a common output node for supplying a respective output current to the load; and b. selecting one of the plurality of power supply modules as master by determining which of the plurality of power supply modules supplies a lowest level of current to the load wherein the remaining one or more of the plurality of power supply modules assume the role of slaves wherein each slave adjusts its respective output current to a level that is a predetermined amount above a level of current supplied by the master.
Claim 3
Dependent Claim
41 words
The method according to claim 1 further comprising a step of exchanging roles between the master and one of the slaves when the level of current supplied to the load by the master is no longer the lowest level of current.
Claim 4
Dependent Claim
17 words
The method according to claim 2 wherein none of the power supply modules is preconditioned as master.
Claim 5
Dependent Claim
28 words
The method according to claim 2 wherein any one of the power supply modules is capable of assuming the role of master of the remaining power supply modules.
Claim 6
Dependent Claim
55 words
The method according to claim 2 further comprising a step of preventing a newly inserted power supply module from assuming the role of master until after a current supplied by the newly inserted power supply module rises to a level that is at least as high as the level of current supplied by the master.
Claim 7
Dependent Claim
143 words
A modular power supply for supplying power to a load, the modular power supply comprising a plurality of power supply modules each coupled to a common output node for supplying power to the load and each coupled to a common control node wherein the one of the power supply modules which supplies a lowest level of current to the load assumes the role of master wherein the master controls the common control node by providing a signal to the common control node which is representative of a level of current supplied by the master and wherein the remaining one or more power supply modules assume the role of slaves wherein each slave monitors the common control node and, in response, adjusts its respective output current to a level that is a predetermined current level above the level of current supplied by the master.
Claim 8
Dependent Claim
143 words
A modular power supply for supplying power to a load, the modular power supply comprising a plurality of power supply modules each coupled to a common output node for supplying power to the load and each coupled to a common control node wherein the one of the power supply modules which supplies a lowest level of current to the load assumes the role of master wherein the master controls the common control node by providing a signal to the common control node which is representative of a level of current supplied by the master and wherein the remaining one or more power supply modules assume the role of slaves wherein each slave monitors the common control node and, in response, adjusts its respective output current to a level that is a predetermined current level above the level of current supplied by the master.
Claim 9
Dependent Claim
20 words
The modular power supply according to claim 6 wherein none of the power supply modules is preconditioned as the master.
Claim 10
Dependent Claim
30 words
The modular power supply according to claim 6 wherein any one of the power supply modules is capable of assuming the role of master of the remaining power supply modules.
Claim 11
Dependent Claim
57 words
The modular power supply according to claim 6 further comprising a circuit for preventing a newly inserted power supply module from controlling the common control node until after a current supplied by the newly inserted power supply module rises to a level that is at least as high as the level of current supplied by the master.
Claim 12
Dependent Claim
33 words
The modular power supply according to claim 6 wherein the master comprises a voltage offset element for ensuring that the common control node is at least as high as a predetermined voltage level.
Claim 13
Dependent Claim
34 words
The modular power supply according to claim 10 wherein the predetermined voltage level is sufficient for forward biasing a diode included in the master and having its anode coupled to the common control node.
Claim 14
Dependent Claim
27 words
The modular power supply according to claim 11 wherein at least one diode is included in a slave, coupled to the common control node and reverse biased.
Claim 15
Dependent Claim
26 words
The modular power supply according to claim 12 wherein the diode included in the slave is forward biased when the slave assumes the role of master.
Claim 16
Dependent Claim
30 words
The modular power supply according to claim 6 wherein the master includes a transistor coupled to the common control node wherein the transistor included in the master is biased on.
Claim 17
Dependent Claim
27 words
The modular power supply according to claim 14 wherein at least one transistor is included in a slave, coupled to the common control node and biased off.
Claim 18
Dependent Claim
26 words
The modular power supply according to claim 15 wherein the transistor included in the slave is biased on when the slave assumes the role of master.
Claim 19
Dependent Claim
91 words
The modular power supply according to claim 6 wherein the master comprises: a. an amplifier having a first amplifier input, a second amplifier input and an amplifier output wherein the first amplifier input is coupled to receive a signal representative of the level of current provided to the load by the master; and b. a pnp bipolar transistor having a base, an emitter and a collector, wherein the base is coupled to the amplifier output and the emitter is coupled to the common control node and to the second amplifier input.
Claim 20
Dependent Claim
28 words
The modular power supply according to claim 17 wherein the emitter is coupled to receive a bias current and wherein the collector is coupled to a ground node.
Claim 21
Dependent Claim
247 words
A modular power supply for supplying power to a load, the modular power supply comprising: a. a first power supply module coupled to an output node for supplying power to the load wherein the first power supply module supplies a first output current to the load; b. a second power supply module coupled to the output node wherein the second power supply supplies a second output current to the load; and c. a control node coupled to the first power supply module and to the second power supply module wherein when the first output current is lower than the second output current, the first power supply module assumes the role of master and the second power supply module assumes the role of slave wherein a signal level for the control node is representative of the first output current and the second power supply module monitors the control node for controlling the second output current to remain a first predetermined level above the level of the first output current and when the second output current is lower than the first output current, the second power supply module assumes the role of master and the first power supply module assumes the role of slave wherein a signal level for the control node is representative of the second output current and the first power supply module monitors the control node for controlling the first output current to remain a second predetermined level above the level of the second output current.
Claim 22
Dependent Claim
247 words
A modular power supply for supplying power to a load, the modular power supply comprising: a. a first power supply module coupled to an output node for supplying power to the load wherein the first power supply module supplies a first output current to the load; b. a second power supply module coupled to the output node wherein the second power supply supplies a second output current to the load; and c. a control node coupled to the first power supply module and to the second power supply module wherein when the first output current is lower than the second output current, the first power supply module assumes the role of master and the second power supply module assumes the role of slave wherein a signal level for the control node is representative of the first output current and the second power supply module monitors the control node for controlling the second output current to remain a first predetermined level above the level of the first output current and when the second output current is lower than the first output current, the second power supply module assumes the role of master and the first power supply module assumes the role of slave wherein a signal level for the control node is representative of the second output current and the first power supply module monitors the control node for controlling the first output current to remain a second predetermined level above the level of the second output current.
Claim 23
Dependent Claim
47 words
The modular power supply according to claim 19 wherein the first power supply module includes a first feedback loop for controlling a voltage level of the output node and a second feedback loop for maintaining a predetermined proportional relationship between the first current and the second current.
Claim 24
Dependent Claim
40 words
The modular power supply according to claim 20 wherein the predetermined proportional relationship is adjusted according to a proportional relationship between a rated capacity of the first power supply module and a rated capacity of the second power supply module.
Claim 25
Dependent Claim
76 words
The modular power supply according to claim 19 wherein the first power supply module forms a first error signal which is representative of a difference between the signal level for the control node and the signal representative of the first current and wherein the first power supply module forms a second error signal which is representative of a difference between a voltage level of the output node and a desired voltage level for the output node.
Claim 26
Dependent Claim
26 words
The modular power supply according to claim 22 wherein the first output current is controlled according to the first error signal and the second error signal.
Claim 27
Dependent Claim
237 words
A power supply for supplying power to a load via an output node, the power supply including a first power supply module, the first power supply module having a control circuit, the control circuit comprising: a. a first terminal for receiving a first signal that is representative of a first current supplied to the load by the first power supply module; b. a second terminal for receiving a second signal that is representative of a second current supplied to the load by a master when the first power supply module is a slave and the second terminal for providing a third signal that is representative of the first current when the first power supply module is the master; c. a diode having an anode, wherein the anode is coupled to the second input terminal; d. means for forming a first error signal representative of a difference between the first current and the second current; e. a third input terminal for receiving a fourth signal representative of an actual voltage level of the output node; f. means for forming an second error signal representative of a difference between a desired voltage level for the output node and the actual voltage level of the output node; g. means for forming a control signal according to the first error signal and the second error signal; and h. a first output terminal for providing the control signal to a voltage regulator.
Claim 28
Dependent Claim
237 words
A power supply for supplying power to a load via an output node, the power supply including a first power supply module, the first power supply module having a control circuit, the control circuit comprising: a. a first terminal for receiving a first signal that is representative of a first current supplied to the load by the first power supply module; b. a second terminal for receiving a second signal that is representative of a second current supplied to the load by a master when the first power supply module is a slave and the second terminal for providing a third signal that is representative of the first current when the first power supply module is the master; c. a diode having an anode, wherein the anode is coupled to the second input terminal; d. means for forming a first error signal representative of a difference between the first current and the second current; e. a third input terminal for receiving a fourth signal representative of an actual voltage level of the output node; f. means for forming an second error signal representative of a difference between a desired voltage level for the output node and the actual voltage level of the output node; g. means for forming a control signal according to the first error signal and the second error signal; and h. a first output terminal for providing the control signal to a voltage regulator.
Claim 29
Dependent Claim
18 words
The power supply according to claim 24 wherein the control circuit is an integrated circuit having eight pins.
Claim 30
Dependent Claim
16 words
The power supply according to claim 24 wherein the voltage regulator includes a pulse-width modulation circuit.
Claim 31
Dependent Claim
35 words
The power supply according to claim 24 wherein the first power supply module is the slave when the first current is higher than a current supplied to the load by a second power supply module.
Claim 32
Dependent Claim
73 words
The power supply according to claim 27 wherein the control circuit further comprises a circuit for preventing the first power supply module from providing the third signal until after a current supplied by the first power supply module rises to a level that is at least as high as the level of current supplied by the second power supply module when the first power supply module is a newly inserted power supply module.
Claim 33
Dependent Claim
192 words
A power supply for supplying power to a load via an output node, the power supply including a first power supply module, the first power supply module having a control circuit, the control circuit comprising: a. a first input terminals for receiving a first signal that is representative of a first current supplied to the load by the first power supply module; b. a second input terminal for receiving a second signal that is representative of a second current supplied to the load by a second power supply module; c. means for forming a first error signal representative of a difference between the first current and the second current; d. a third input terminal for receiving a third signal representative of an actual voltage level of the output node; e. means for forming an second error signal representative of a difference between a desired voltage level for the output node and the actual voltage level of the output node; f. means for forming a control signal according to the first error signal and the second error signal; and g. a first output terminal for providing the control signal to a voltage regulator.
Claim 34
Dependent Claim
192 words
A power supply for supplying power to a load via an output node, the power supply including a first power supply module, the first power supply module having a control circuit, the control circuit comprising: a. a first input terminals for receiving a first signal that is representative of a first current supplied to the load by the first power supply module; b. a second input terminal for receiving a second signal that is representative of a second current supplied to the load by a second power supply module; c. means for forming a first error signal representative of a difference between the first current and the second current; d. a third input terminal for receiving a third signal representative of an actual voltage level of the output node; e. means for forming an second error signal representative of a difference between a desired voltage level for the output node and the actual voltage level of the output node; f. means for forming a control signal according to the first error signal and the second error signal; and g. a first output terminal for providing the control signal to a voltage regulator.
Claim 35
Dependent Claim
16 words
The power supply according to claim 29 wherein the voltage regulator includes a pulse-width modulation circuit.
Claim 36
Dependent Claim
27 words
The power supply according to claim 29 further comprising the second power supply module wherein the control circuit controls the first current according to the second current.
Claim 37
Dependent Claim
29 words
The power supply according to claim 29 wherein the control circuit further comprises a second output terminal for providing the first error signal to a third power supply module.
Claim 38
Dependent Claim
32 words
The power supply according to claim 32 further comprising the third power supply module wherein the control circuit controls a third current supplied to the load by the third power supply module.
Claim 39
Dependent Claim
38 words
The power supply according to claim 33 further comprising a fourth power supply module coupled to the second output terminal wherein the control circuit controls a fourth current supplied to the load by the fourth power supply module.
Claim 40
Dependent Claim
27 words
The power supply according to claim 33 further comprising the second power supply module wherein the control circuit controls the first current according to the second current.
Claim 41
Dependent Claim
39 words
The power supply according to claim 35 wherein the third power supply module is coupled to the second power supply module for controlling the second current thereby coupling the first, second and third power supply modules in a loop.
Claim 42
Dependent Claim
20 words
The power supply according to claim 36 further comprising one or more additional power supply modules coupled in the loop.
Claim 43
Dependent Claim
202 words
A power supply for supplying power to a load via an output node, the power supply including a first power supply module, the first power supply module having a control circuit, wherein the control circuit is an integrated circuit having ten pins or fewer comprising: a. a first input terminal for receiving a first signal that is representative of a first current supplied to the load by the first power supply module; b. a second input terminal for receiving a second signal that is representative of a second current supplied to the load by a second power supply module; c. means for forming a first error signal representative of a difference between the first current and the second current; d. a third input terminal for receiving a third signal representative of an actual voltage level of the output node; e. means for forming an second error signal representative of a difference between a desired voltage level for the output node and the actual voltage level of the output node; f. means for forming a control signal according to the first error signal and the second error signal; and g. a first output terminal for providing the control signal to a voltage regulator.
Claim 44
Dependent Claim
202 words
A power supply for supplying power to a load via an output node, the power supply including a first power supply module, the first power supply module having a control circuit, wherein the control circuit is an integrated circuit having ten pins or fewer comprising: a. a first input terminal for receiving a first signal that is representative of a first current supplied to the load by the first power supply module; b. a second input terminal for receiving a second signal that is representative of a second current supplied to the load by a second power supply module; c. means for forming a first error signal representative of a difference between the first current and the second current; d. a third input terminal for receiving a third signal representative of an actual voltage level of the output node; e. means for forming an second error signal representative of a difference between a desired voltage level for the output node and the actual voltage level of the output node; f. means for forming a control signal according to the first error signal and the second error signal; and g. a first output terminal for providing the control signal to a voltage regulator.
Claim 45
Dependent Claim
241 words
A power supply for supplying power to a load via an output node, the power supply including a first power supply module, the first power supply module having a control circuit, wherein the control circuit detects whether a second power supply module is coupled to a second input terminal, and, in response to detecting that the second power supply module is not coupled to the second input terminal, the control circuit disables a means for forming a first error signal, the control circuit comprising: a. a first input terminal for receiving a first signal that is representative of a first current supplied to the load by the first power supply module; b. a second input terminal for receiving a second signal that is representative of a second current supplied to the load by a second power supply module; c. means for forming a first error signal representative of a difference between the first current and the second current; d. a third input terminal for receiving a third signal representative of an actual voltage level of the output node; e. means for forming an second error signal representative of a difference between a desired voltage level for the output node and the actual voltage level of the output node; f. means for forming a control signal according to the first error signal and the second error signal; and g. a first output terminal for providing the control signal to a voltage regulator.
Claim 46
Dependent Claim
241 words
A power supply for supplying power to a load via an output node, the power supply including a first power supply module, the first power supply module having a control circuit, wherein the control circuit detects whether a second power supply module is coupled to a second input terminal, and, in response to detecting that the second power supply module is not coupled to the second input terminal, the control circuit disables a means for forming a first error signal, the control circuit comprising: a. a first input terminal for receiving a first signal that is representative of a first current supplied to the load by the first power supply module; b. a second input terminal for receiving a second signal that is representative of a second current supplied to the load by a second power supply module; c. means for forming a first error signal representative of a difference between the first current and the second current; d. a third input terminal for receiving a third signal representative of an actual voltage level of the output node; e. means for forming an second error signal representative of a difference between a desired voltage level for the output node and the actual voltage level of the output node; f. means for forming a control signal according to the first error signal and the second error signal; and g. a first output terminal for providing the control signal to a voltage regulator.
References Cited (Backward Citations)
US3294981A
Cited
US3539902A
Cited
US3603809A
Cited
US4456872A
Cited
US3660753A
Cited
US3742330A
Cited
US3832643A
Cited
US3883756A
Cited
US4035710A
Cited
US4177389A
Cited
US4311954A
Cited
US4293904A
Cited
US4392103A
Cited
US4407588A
Cited
US4356403A
Cited
US4454558A
Cited
US4422138A
Cited
US4437146A
Cited
JPS6022490A
Cited
US4529927A
Cited
US4731574A
Cited
US4628438A
Cited
US4685043A
Cited
US4717833A
Cited
US4618779A
Cited
US4651231A
Cited
US4695935A
Cited
US4661896A
Cited
US4691159A
Cited
US4674020A
Cited
US4677366A
Cited
US4672518A
Cited
US4761725A
Cited
US4672303A
Cited
US4947309A
Cited
US4736151A
Cited
US4866295A
Cited
US4886952A
Cited
US4929882A
Cited
US4841220A
Cited
US4975823A
Cited
US4845420A
Cited
US4837495A
Cited
US4941080A
Cited
US5034873A
Cited
US4950974A
Cited
US4920309A
Cited
US5028861A
Cited
US4940929A
Cited
US5146399A
Cited
US5138249A
Cited
US5278490A
Cited
US5132606A
Cited
US5157269A
Cited
US5349284A
Cited
US5485361A
Cited
US5070439A
Cited
US5272613A
Cited
US5161097A
Cited
US5477132A
Cited
US5457621A
Cited
US5359281A
Cited
US5287261A
Cited
US5457622A
Cited
US5436550A
Cited
US5481178A
Cited
US5440473A
Cited
US5397976A
Cited
US5570276A
Cited
US5461302A
Cited
US5414341A
Cited
US5412308A
Cited
US5434767A
Cited
US5450000A
Cited
US5552695A
Cited
US5532577A
Cited
US5491445A
Cited
US5565761A
Cited
US5502370A
Cited
US5479089A
Cited
US5627460A
Cited
US5592071A
Cited
US5568041A
Cited
US5617306A
Cited
US5747977A
Cited
US5592128A
Cited
US5771164A
Cited
US5610502A
Cited
US5691592A
Cited
US5663874A
Cited
US5691889A
Cited
US5847548A
Cited
US5861734A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-12-26 | 2004-06-26 | 2004-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-12-26 | 2008-06-26 | 2008-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-12-26 | 2012-06-26 | 2012-12-26 | $7700.00 | Window Closed / Lapsed |