Charging pump device and driving ability adjustment method thereof
A charging pump and driving capability technology, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve problems such as large periodic output ripples, inability to properly supply loads, and large output ripples
Active Publication Date: 2016-01-20
NOVATEK MICROELECTRONICS CORP
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Problems solved by technology
The size of the output ripple is proportional to the charge and discharge current, so the comparator structure with a large charge current will cause the output voltage VGH to have a large periodic output ripple
[0013] In this case, although the charging pump device 20 controlled by the comparator has no stability problem, it has relatively large output ripple. If the output ripple is reduced by reducing the drive capability of the drive signal DRVP, its load capacity will also drop and may not be properly loaded
Method used
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[0068] In the charging pump device and its driving ability adjusting method according to the exemplary embodiment of the present invention, by detecting whether the output voltage of the charging pump circuit is maintained at a target voltage and the number of times the output voltage is not maintained at the target voltage, correspondingly adjust The drive capability of the driver stage, which in turn is able to output an output voltage with minimal ripple that can sustain the load. In order to understand the present invention more clearly, at least one exemplary embodiment will be described in detail below with reference to the accompanying drawings. In the exemplary embodiments of the present invention, the connection terms mentioned, such as coupling or connection, etc., are only used for illustration with reference to the attached drawings, and are not used to limit the actual connection relationship between two components. direct coupling or indirect coupling.
[0069] ...
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The invention discloses a charge-pump device which comprises a driving stage, a charge-pump circuit, a comparison circuit, an overload detection circuit and a driving capability control circuit, wherein the driving stage is used for generating a drive signal corresponding to a driving capability, the charge-pump circuit is used for generating an output voltage according to the driving signal, the comparison circuit comprises a first comparator, the first comparator is used for making a comparison between the output voltage and a first reference voltage so as to generate a first comparison signal, the overload detection circuit is used for generating a detection result according to at least one of the first comparison signal and the output voltage, and the driving capability control circuit is coupled between the overload detection circuit and the driving stage so as to control the driving capability corresponding to the driving signal according to the detection result.
Description
technical field [0001] The present invention relates to a charging pump device and its driving capability adjustment method, especially to a charging pump device and its driving capability which can adjust the output driving capability according to the load condition and simultaneously take into account the performance of the output ripple and the load supply capability. Adjustment method. Background technique [0002] Generally speaking, a charge pump can be used to provide a stable output voltage to different loads. There are two known control methods for the charge pump, which are controlled by an operational amplifier and controlled by a comparator. Under the architecture controlled by the operational amplifier, the output voltage has a small output ripple, but there will be stability considerations under different loads and external components; while under the architecture controlled by the comparator, although there is no stability problem, but the output voltage has ...
Claims
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IPC IPC(8): G05F1/56
Inventor 邱珦益丁振国
Owner NOVATEK MICROELECTRONICS CORP