Hysteretic Current Mode Buck-Boost Control Architecture
A voltage and mode technology, applied in control/regulation systems, electrical components, circuit devices, etc., can solve problems such as sacrificing systems and increasing complexity
Inactive Publication Date: 2018-05-29
INTERSIL INC
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Problems solved by technology
The traditional approach is to use a fixed frequency system and add patches to help smooth the mode transitions, which usually increases complexity and may sacrifice speed, linearity and transient response of the system
The hysteretic current-mode control architecture provides the fastest transient response in both buck and boost modes and does not require slope compensation, but it does so close to the buck-boost boundary, i.e. when the input There are also significant regulation challenges when the voltage and output voltage are close to each other
Method used
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[0025] A hysteretic current mode buck-boost control architecture as described herein improves mode transitions between buck, buck-boost, and boost regulation modes and further improves load transient response.
[0026] figure 1is a simplified block diagram of an electronic device 100 configured with a power system 101 including a voltage regulator 103 implemented in accordance with an embodiment of the present invention. The power system 101 develops one or more supply voltages, which provide power to other system devices of the electronic device 100 . In the illustrated embodiment, the electronic device 100 includes a processor 107 and a peripheral system 109 coupled to receive a supply voltage from the power system 101 via a supply bus 105, the supply Bus 105 is any combination containing power and / or signal conductors. In the illustrated embodiment, the peripheral system 109 may include a system memory 111, such as random access memory (RAM) and / or read only memory (ROM) ...
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A hysteretic current mode buck-boost voltage regulator includes a buck-boost voltage converter, a switcher, a window circuit, a ramp circuit, and a timing circuit. The timing circuit may be an additional ramp circuit. The voltage converter is switched between first and second switching states during a boost mode, between third and fourth switching states during a buck mode, and is switched between a buck During boost mode, each switching state is cycled through sequentially. The ramp circuit develops a ramp voltage that emulates the current through the voltage converter, and switching is determined using a comparison of the ramp voltage with a window voltage provided by the window circuit. The window voltage is the settling frequency and can be adjusted according to the input and output voltages. The timing circuit provides timing indication during the buck-boost mode to ensure that the second and fourth switching states have substantially the same duration to provide symmetry to the ramp signal.
Description
technical field [0001] Cross-reference to related applications [0002] This application is claiming the benefit of US Provisional Application Serial No. 62 / 062,463 filed October 10, 2014, which is hereby incorporated by reference in its entirety for all intents and purposes. [0003] This application relates to voltage regulators, and more particularly to voltage regulators having a hysteretic current mode buck-boost control architecture. Background technique [0004] A voltage regulator that converts an input voltage to a regulated output voltage operates in buck mode when the input voltage is greater than the output voltage, and in boost mode when the input voltage is less than the output voltage. in pressure mode. When the input voltage ranges from less than the output voltage to greater than the output voltage, the voltage regulator must support both modes and must switch between the modes. Furthermore, when the input and output voltages are close enough to each othe...
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IPC IPC(8): H02M3/158
CPCH02M3/1582H02M1/0009H02M1/0083H02J7/00H02M1/08
Inventor M·杰森·休士顿艾瑞克·M·索利
Owner INTERSIL INC