DC-DC converter, with duty cycle comparison for a dual mode back boost converter
First Claim
1. A converter for converting an input voltage (Ui) into an output voltage (U0), having a switch (S1-S4) for controlling the converter under control of a binary signal (BS) by means of adaptation of the duty cycle of the binary signal (BS) so as to obtain a desired value of the output voltage (U0), which converter has at least two conversion modes and which converter in its operation condition is in one of at the least two conversion modes, and selection means (SLMNS) for the selection of one of the at least two conversion modes, characterized in that the selection means (SLMNS) include detection means (DMNS) for the detection of the duty cycle of the binary signal (BS), and comparison means (CMPMNS) for comparing the duty cycle of the binary signal (BS) with a reference duty cycle (RFDCCL) and for supplying a mode control signal (MDCNTRL) in response to the comparison in order to change over from one of the at least two conversion modes to another one of the at least two conversion modes.
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Abstract
A converter for converting an input voltage (Ui) into an output voltage (U0). The converter has several modes of operation. The converter can, for example, operate in an up-conversion mode, a down-conversion mode, or a window conversion mode. The converter has at least one switch (S1-S4) for controlling the converter so as to obtain a desired value of the output voltage (U0) in the up-conversion mode and in the down-conversion mode. This is achieved by changing the duty cycle of a binary signal (BS) which controls the switch (S1-S4). The converter further includes means (DMNS) for detecting the duty cycle of the binary signal (BS). This duty cycle is compared with a reference duty cycle (RFDCCL). The result of this comparison is used for deciding whether or not to change over from the up-conversion mode (or the down-conversion mode) to the window conversion mode. In the window conversion mode each switch (S1-S4) in the converter is permanently closed or open. In the window conversion mode the output voltage (U0) is roughly equal to the input voltage (Ui). The converter remains in the window conversion mode as long as the output voltage (U0) is within a given voltage window (range). However, if the output voltage (U0) has become too low, the converter changes over from the window conversion mode to the up-conversion mode. In a similar way, the converter changes over from the window conversion mode to the down-conversion mode when the output voltage (U0) has become too high.
70 Citations
9 Claims
- 1. A converter for converting an input voltage (Ui) into an output voltage (U0), having a switch (S1-S4) for controlling the converter under control of a binary signal (BS) by means of adaptation of the duty cycle of the binary signal (BS) so as to obtain a desired value of the output voltage (U0), which converter has at least two conversion modes and which converter in its operation condition is in one of at the least two conversion modes, and selection means (SLMNS) for the selection of one of the at least two conversion modes, characterized in that the selection means (SLMNS) include detection means (DMNS) for the detection of the duty cycle of the binary signal (BS), and comparison means (CMPMNS) for comparing the duty cycle of the binary signal (BS) with a reference duty cycle (RFDCCL) and for supplying a mode control signal (MDCNTRL) in response to the comparison in order to change over from one of the at least two conversion modes to another one of the at least two conversion modes.
Specification