Control device and method of buck/boost converter
A buck-boost converter and control device technology, which is applied in the direction of output power conversion devices, control/regulation systems, instruments, etc., can solve problems such as device performance impact and device failure to operate normally, and achieve the effect of reducing ripple
Inactive Publication Date: 2014-09-10
RICHTEK TECH
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Problems solved by technology
[0004] However, when the buck-boost converter switches modes, the output voltage of the buck-boost converter will have ripples, which will affect the performance of the device receiving the output voltage, and even make the device unable to operate. working normally
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[0032] Embodiments of the present invention will be described below in conjunction with related figures. In the drawings, the same reference numerals indicate the same or similar elements or process steps.
[0033] Certain terms are used in the description and claims to refer to particular elements. Those skilled in the art should understand that the same element may be called by different terms. This description and the following claims do not use the difference in name as the way to distinguish components, but the difference in function of the components as the basis for distinction. "Includes" mentioned throughout the specification and subsequent claims is an open term, so it should be interpreted as "including but not limited to". In addition, the term "coupled" includes any direct and indirect means of connection. Therefore, if it is described in the text that the first device is coupled to the second device, it means that the first device can be directly connected (in...
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One of embodiments of a control device provided by the invention comprises a signal generation circuit and a mode determination circuit. The signal generation circuit is used for generating a first control signal and a second control signal according to an output voltage of a buck / boost converter. The first control signal is used for controlling a first switch and a second switch of the buck / boost converter, so that the first switch and the second switch can not be conducted simultaneously. The second control signal is used for controlling a third switch and a fourth switch of the buck / boost converter, so that the third switch and the fourth switch can not be conducted simultaneously. When the duty ratio of the first control signal is larger than a first default value and the duty ratio of the second control signal is smaller than a second default value, the mode determination circuit is provided with the signal generation circuit, so that the first control signal and the second control signal generated by the signal generation circuit have the substantially same duty ratio.
Description
technical field [0001] The invention relates to a control device, in particular to a control device applicable to a buck-boost converter. Background technique [0002] The buck-boost converter mainly includes three operating modes, namely boost mode, buck mode and buck-boost mode, and can be based on The setting of the control signal provides an output voltage lower than the input voltage, higher than the input voltage, or substantially the same as the input voltage. [0003] In boost mode, the buck-boost converter receives a lower input voltage and outputs a higher output voltage. In buck mode, a buck-boost converter receives a higher input voltage and outputs a lower output voltage. In the buck-boost mode, the buck-boost converter can provide an output voltage lower than the input voltage, higher than the input voltage, or substantially the same as the input voltage. [0004] However, when the buck-boost converter switches modes, the output voltage of the buck-boost con...
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IPC IPC(8): H02M3/156H02M1/14
CPCH02M3/1582
Inventor 陈文玮刘国基
Owner RICHTEK TECH