A Voltage Ripple Compensation Method for Constant On-Time Buck Converter
Subharmonic oscillation stands as a critical concern in the context of ripple-based constant-on-time (COT) controllers. While this issue can be mitigated through the application of the virtual inductor current (VIC) technique, it comes at the cost of load transient response. To achieve both high sta...
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| Format: | Article |
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IEEE
2023-01-01
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| Series: | IEEE Access |
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| Online Access: | https://ieeexplore.ieee.org/document/10354307/ |
| _version_ | 1797376351154470912 |
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| author | Jiang-Ping He Xin-Rui Liu Yan-Kun Xia Yong-Qiang Chen Chang-Dong Wu |
| author_facet | Jiang-Ping He Xin-Rui Liu Yan-Kun Xia Yong-Qiang Chen Chang-Dong Wu |
| author_sort | Jiang-Ping He |
| collection | DOAJ |
| description | Subharmonic oscillation stands as a critical concern in the context of ripple-based constant-on-time (COT) controllers. While this issue can be mitigated through the application of the virtual inductor current (VIC) technique, it comes at the cost of load transient response. To achieve both high stability and rapid transient response, this paper introduces an Output Capacitor Voltage Ripple Compensation (VRC) technique. This technique minimizes the phase delay attributed to output capacitance by introducing a virtual output ripple (<inline-formula> <tex-math notation="LaTeX">$\text{V}_{\mathrm {VOR}})$ </tex-math></inline-formula> inversely related to the feedback voltage. The VVOR serves to expedite the load transient response by counteracting the additional virtual inductor current injection during load transients. Utilizing a <inline-formula> <tex-math notation="LaTeX">$0.13\mu \text{m}$ </tex-math></inline-formula> BCD technology, a synchronous buck converter is integrated with the proposed VRC-COT controller, showcasing exceptional stability across a load current range of 0 to 8A, even when equipped with a 30% <inline-formula> <tex-math notation="LaTeX">$88\mu \text{F}$ </tex-math></inline-formula> ceramic output capacitor. Additionally, the load transient response exhibits reduced overshoot and undershoot, measuring at 120mV and 130mV, respectively, in response to load steps from 0A to 8A within a <inline-formula> <tex-math notation="LaTeX">$10\mu \text{S}$ </tex-math></inline-formula> timeframe. |
| first_indexed | 2024-03-08T19:37:18Z |
| format | Article |
| id | doaj.art-64562e40319a413ba87230dbde9e9a04 |
| institution | Directory Open Access Journal |
| issn | 2169-3536 |
| language | English |
| last_indexed | 2024-03-08T19:37:18Z |
| publishDate | 2023-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Access |
| spelling | doaj.art-64562e40319a413ba87230dbde9e9a042023-12-26T00:03:27ZengIEEEIEEE Access2169-35362023-01-011113962813964210.1109/ACCESS.2023.334201610354307A Voltage Ripple Compensation Method for Constant On-Time Buck ConverterJiang-Ping He0https://orcid.org/0000-0002-7212-4606Xin-Rui Liu1Yan-Kun Xia2Yong-Qiang Chen3Chang-Dong Wu4School of Electrical Engineering and Electronic Information, Xihua University (XHU), Chengdu, ChinaSchool of Electrical Engineering and Electronic Information, Xihua University (XHU), Chengdu, ChinaSchool of Electrical Engineering and Electronic Information, Xihua University (XHU), Chengdu, ChinaSchool of Electrical Engineering and Electronic Information, Xihua University (XHU), Chengdu, ChinaSchool of Electrical Engineering and Electronic Information, Xihua University (XHU), Chengdu, ChinaSubharmonic oscillation stands as a critical concern in the context of ripple-based constant-on-time (COT) controllers. While this issue can be mitigated through the application of the virtual inductor current (VIC) technique, it comes at the cost of load transient response. To achieve both high stability and rapid transient response, this paper introduces an Output Capacitor Voltage Ripple Compensation (VRC) technique. This technique minimizes the phase delay attributed to output capacitance by introducing a virtual output ripple (<inline-formula> <tex-math notation="LaTeX">$\text{V}_{\mathrm {VOR}})$ </tex-math></inline-formula> inversely related to the feedback voltage. The VVOR serves to expedite the load transient response by counteracting the additional virtual inductor current injection during load transients. Utilizing a <inline-formula> <tex-math notation="LaTeX">$0.13\mu \text{m}$ </tex-math></inline-formula> BCD technology, a synchronous buck converter is integrated with the proposed VRC-COT controller, showcasing exceptional stability across a load current range of 0 to 8A, even when equipped with a 30% <inline-formula> <tex-math notation="LaTeX">$88\mu \text{F}$ </tex-math></inline-formula> ceramic output capacitor. Additionally, the load transient response exhibits reduced overshoot and undershoot, measuring at 120mV and 130mV, respectively, in response to load steps from 0A to 8A within a <inline-formula> <tex-math notation="LaTeX">$10\mu \text{S}$ </tex-math></inline-formula> timeframe.https://ieeexplore.ieee.org/document/10354307/Constant on-time (COT)ripple-based controlvoltage ripple compensation (VRC)equivalent series resistor (ESR)subharmonic oscillation |
| spellingShingle | Jiang-Ping He Xin-Rui Liu Yan-Kun Xia Yong-Qiang Chen Chang-Dong Wu A Voltage Ripple Compensation Method for Constant On-Time Buck Converter IEEE Access Constant on-time (COT) ripple-based control voltage ripple compensation (VRC) equivalent series resistor (ESR) subharmonic oscillation |
| title | A Voltage Ripple Compensation Method for Constant On-Time Buck Converter |
| title_full | A Voltage Ripple Compensation Method for Constant On-Time Buck Converter |
| title_fullStr | A Voltage Ripple Compensation Method for Constant On-Time Buck Converter |
| title_full_unstemmed | A Voltage Ripple Compensation Method for Constant On-Time Buck Converter |
| title_short | A Voltage Ripple Compensation Method for Constant On-Time Buck Converter |
| title_sort | voltage ripple compensation method for constant on time buck converter |
| topic | Constant on-time (COT) ripple-based control voltage ripple compensation (VRC) equivalent series resistor (ESR) subharmonic oscillation |
| url | https://ieeexplore.ieee.org/document/10354307/ |
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