Circuits and methods related to voltage converters
In a voltage converter, a mode configuration is selected in response to a mode control signal using a switch matrix having two or more mode configurations. Each mode configuration corresponds to one of two or more output signal voltages. The output signal is compared with a reference signal to produce a direction comparison signal. The direction comparison signal is used to produce the mode control signal.
1. A method for converting voltage, comprising:
providing a capacitor circuit having capacitors capable of being interconnected differently by a switch matrix between a voltage node and an output node in each of at least two mode configurations, each mode configuration including a first phase configuration associated with discharging the capacitor circuit and a second phase configuration associated with charging the capacitor circuit;
producing a mode selection signal in response to a comparison of an output voltage at the output node and a reference voltage, and a comparison involving a different voltage associated with each of the at least two mode configurations; and
configuring the switch matrix to interconnect the capacitors into one of the at least two mode configurations based on the mode selection signal.
2. A method for performing voltage conversion, the method comprising:
providing a capacitor circuit having capacitors capable of being interconnected by a switch matrix in each of at least two mode configurations, each mode configuration having a voltage level at an output node that is a different fraction of a voltage potential and including a first phase configuration associated with discharging the capacitor circuit and a second phase configuration associated with charging the capacitor circuit;
generating a mode selection signal based on a first signal and a second signal, the first signal being indicative of whether an output voltage at the output node is greater in magnitude than a reference voltage, and the second signal being indicative of whether the output voltage is greater in magnitude than a first voltage level corresponding to a first of the at least two mode configurations; and
configuring the switch matrix to interconnect the capacitors into one of the at least two mode configurations based on the mode selection signal.
3. The method of claim 2 wherein the configuring of the switch matrix includes interconnecting the capacitors between a ground potential and the output node in the first phase configuration of each of the at least two of mode configurations.
4. The method of claim 3 wherein the switch matrix is configured to interconnect the capacitors differently between the ground potential and the output node in different mode configurations of the at least two of mode configurations.
5. The method of claim 2 wherein the configuring of the switch matrix includes switching between the first phase configuration and the second phase configuration responsive to a clock signal.
6. The method of claim 2 wherein the at least two mode configurations include three or more mode configurations.
7. The method of claim 2 wherein the voltage potential is provided by a battery.
8. The method of claim 2 further comprising providing the first signal and the second signal with a comparator circuit.
9. The method of claim 8 further comprising providing a third signal indicative of whether the output voltage is greater in magnitude than a second voltage level corresponding to a second of the at least two mode configurations, such that the mode selection signal is generated based on the third signal.
10. A method for performing voltage conversion, the method comprising:
providing a capacitor circuit having capacitors capable of being interconnected differently by a switch matrix between a voltage potential and an output node to provide an output voltage at the output node in each of a plurality of mode configurations;
generating a mode selection signal based on a first comparison signal indicative of whether the output voltage is greater in magnitude than a reference voltage, a second comparison signal indicative of whether the output voltage is greater in magnitude than a first voltage level associated with a first of the plurality of mode configurations, and a third comparison signal indicative of whether the output voltage is greater in magnitude than a second voltage level associated with a second of the plurality of mode configurations; and
configuring the switch matrix to interconnect the capacitors into one of the plurality of mode configurations based on the mode selection signal.
11. The method of claim 10 wherein each of the plurality of mode configurations includes a first phase configuration associated with discharging the capacitor circuit and a second phase configuration associated with charging the capacitor circuit.
12. The method of claim 11 wherein the configuring of the switch matrix includes interconnecting the capacitors between a ground and the output node in the first phase configuration, and interconnecting the capacitors between the voltage potential and the output node in the second phase configuration.
13. The method of claim 10 wherein the plurality of mode configurations includes three or more mode configurations.
14. The method of claim 13 wherein the generating of the mode selection signal is further based on a fourth comparison signal indicative of whether the output voltage is greater in magnitude than a third voltage level associated with a third of the plurality of mode configurations.