Single-inductor multiple-output switching converters with bipolar outputs

Correspondence to Paul C. Reprints and Permissions. Chao, P. Microsyst Technol 22, — Download citation. Received : 18 September Accepted : 01 February Published : 29 February Issue Date : June Anyone you share the following link with will be able to read this content:. Moreover, for output switching frequency higher than MHz, the output capacitors can be small enough to be integrated on-chip.

The outputs vary from 0. The design uses single uH off-chip inductor, 2-nF on-chip capacitor for each mA output and 4. The DF-SIMO topology enables realizing multiple efficient power supplies with faster dynamic response, better cross-regulation, and lower overall cost compared to conventional SIMO topologies. The circuit of claim 1 , wherein said source of electrical potential is between a positive supply voltage and a negative supply voltage.

The circuit of claim 1 , wherein said source of electrical potential is between two different supply voltages of like polarity. The circuit of claim 1 , wherein said first output is produced at a first output terminal, said second output is produced at a second output terminal, and said source of electrical potential is across first and second input terminals. The circuit of claim 10 , further comprising: a first output capacitor coupled to said first output terminal; and.

The circuit of claim 1 , wherein said switch control includes time sequencing logic that controls switching states of said first and second auxiliary switches such that said first and second auxiliary switches are charged alternately on a pulse-by-pulse basis. The circuit of claim 1 , further comprises a current sensing circuit to detect at least one of current and voltage of at least one of said main switch, said auxiliary switches, said inductive element, and said output, or any combination of current and voltage of said main switch, said auxiliary switches, said inductive element and said output; and a circuit to determine the pre-defined current level for freewheel switching in each switching cycle.

A circuit for providing a plurality of independently regulated output voltages, said circuit comprising: a a main switch and an inductive element coupled in series with a source of electric potential;. A circuit for providing a single regulated output voltage, said circuit comprising: a a main switch and an inductive element coupled in series with a source of electric potential;.

The circuit of claim 13 , wherein said switch control includes said current sensing circuit to detect at least one of a current and voltage of at least one of said main switch, said first auxiliary switch, said second auxiliary switch, said inductive element, said first output, and said second output; and.

The circuit of claim 14 , further comprises a current sensing circuit to detect at least one of current and voltage of at least one of said main switch, said auxiliary switches, said inductive element, and said output, or any combination of current and voltage of said main switch, said auxiliary switches, said inductive element and said output; and a circuit to determine the pre-defined current level for freewheel switching in each switching cycle. The circuit of claim 15 , further comprises a current sensing circuit to detect at least one of current and voltage of at least one of said main switch, said auxiliary switch, said inductive element, and said output, or any combination of current and voltage of said main switch, said auxiliary switch, said inductive element and said output; and a circuit to determine the pre-defined current level for freewheel switching in each switching cycle.

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Baek et al. USB1 en. However, unlike the preset invention, the circuit topologies and switch sequence operations described in the prior art do not provide buck-boost capability with the generation of bipolar output voltages. Patent Application No. However, like other known power converters, this power converter does not provide the buck-boost or bipolar voltage output capabilities of the present invention.

Finally, U. This is unlike the power converter of the present invention, which develops proportional continuous control signals by evaluating error feedback levels. In the design of portable electronic products, such as mobile communications gear, there is a need for low-cost, efficient, and physically compact power conversion circuits. For example, the required positive and negative voltages powering a cell phone's active-matrix organic LED display driver are sometimes generated using a two-inductor switch-mode power supply.

Since inductors tend to be relatively large and represent additional cost, a single-inductor approach which produces bipolar outputs would be attractive. In accordance with the present invention, a single-inductor switch-mode converter produces bipolar output voltages and is capable of buck-boost operation to either step up or step down the input source voltage.

The power converter of the present invention employs a single inductor and produces two output voltages of opposite polarity with respect to ground from a single input supply voltage.

Its buck-boost capability permits the output voltages to be either higher or lower than the input supply voltage source and to be independently adjustable by means of feedback component selection. These important features are accomplished through the use of a five-switch bridge.

Two of the switches are capable of steering inductor current to ground which, under direction from a controller, allows inductor current to be diverted away from either output as needed to maintain proper output voltage regulation.

In the preferred embodiment, the inductor current can be delivered to both outputs during a single switching cycle. The result is a lower output voltage ripple compared to prior art power converters which steer pulses of inductor current to an output terminal on alternating switch cycles.

The five-switch configuration of the present power converter relieves constraints on the ratio of the output currents delivered by the single inductor to the positive and negative output terminals over a wide range of input voltages.

By contrast, the prior art four-switch power converters are subject to those constraints. Referring now to FIG. The circuit utilizes a single source of supply voltage to produce positive and negative output voltages at output terminals , , with respect to circuit ground terminal An input switch connects the supply voltage to a first terminal of an inductor A switch is connected between terminal of inductor and ground terminal A switch is connected between terminal of inductor and a negative output terminal A switch is connected between a second terminal of inductor and ground terminal A switch is connected between terminal of inductor and a positive output terminal Switches , may be replaced by conventional diode devices.

A first capacitor is connected between positive output terminal and ground terminal A second capacitor is connected between negative output terminal and ground terminal Capacitors , serve to maintain the voltage at output terminals , by supplying load current during the time that inductor is disconnected from a load at output terminals ,