Publicação
Analysis and implementation of a multi-ratio switched capacitor DC-DC converter for a supercapacitor power supply
| Resumo: | An energy harvesting system requires an energy storing device to store the energy retrieved from the surrounding environment. This can either be a rechargeable battery or a supercapcitor. Due to the limited lifetime of rechargeable batteries, they need to be periodically replaced. Therefore, a supercapacitor, which has ideally a limitless number of charge/discharge cycles can be used to store the energy; however, a voltage regulator is required to obtain a constant output voltage as the supercapacitor discharges. This can be implemented by a Switched-Capacitor DC-DC converter which allows a complete integration in CMOS technology, although it requires several topologies in order to obtain a high efficiency. This thesis presents the complete analysis of four different topologies in order to determine expressions that allow to design and determine the optimum input voltage ranges for each topology. To better understand the parasitic effects, the implementation of the capacitors and the non-ideal effect of the switches, in 130 nm technology, were carefully studied. With these two analysis a multi-ratio SC DC-DC converter was designed with an output power of 2 mW, maximum efficiency of 77%, and a maximum output ripple, in the steady state, of 23 mV; for an input voltage swing of 2.3 V to 0.85 V. This proposed converter has four operation states that perform the conversion ratios of 1/2, 2/3, 1/1 and 3/2 and its clock frequency is automatically adjusted to produce a stable output voltage of 1 V. These features are implemented through two distinct controller circuits that use asynchronous time machines (ASM) to dynamically adjust the clock frequency and to select the active state of the converter. All the theoretical expressions as well as the behaviour of the whole system was verified using electrical simulations. |
|---|---|
| Autores principais: | Madeira, Ricardo Falé de Carvalho |
| Assunto: | DC-DC power converters Switched capacitor circuits Supercapacitor Performance analyses Design optimization Efficiency |
| Ano: | 2015 |
| País: | Portugal |
| Tipo de documento: | dissertação de mestrado |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade Nova de Lisboa |
| Idioma: | inglês |
| Origem: | Repositório Institucional da UNL |
| _version_ | 1868982579449823232 |
|---|---|
| author | Madeira, Ricardo Falé de Carvalho |
| author_facet | Madeira, Ricardo Falé de Carvalho |
| author_role | author |
| contributor_name_str_mv | Paulino, Nuno RUN |
| country_str | PT |
| creators_json_txt | [{\"Person.name\":\"Madeira, Ricardo Falé de Carvalho\"}] |
| datacite.contributors.contributor.contributorName.fl_str_mv | Paulino, Nuno RUN |
| datacite.creators.creator.creatorName.fl_str_mv | Madeira, Ricardo Falé de Carvalho |
| datacite.date.Accepted.fl_str_mv | 2015-03-01T00:00:00Z |
| datacite.date.available.fl_str_mv | 2015-10-15T16:54:49Z |
| datacite.date.embargoed.fl_str_mv | 2015-10-15T16:54:49Z |
| datacite.rights.fl_str_mv | http://purl.org/coar/access_right/c_abf2 |
| datacite.subjects.subject.fl_str_mv | DC-DC power converters Switched capacitor circuits Supercapacitor Performance analyses Design optimization Efficiency |
| datacite.titles.title.fl_str_mv | Analysis and implementation of a multi-ratio switched capacitor DC-DC converter for a supercapacitor power supply |
| dc.contributor.none.fl_str_mv | Paulino, Nuno RUN |
| dc.creator.none.fl_str_mv | Madeira, Ricardo Falé de Carvalho |
| dc.date.Accepted.fl_str_mv | 2015-03-01T00:00:00Z |
| dc.date.available.fl_str_mv | 2015-10-15T16:54:49Z |
| dc.date.embargoed.fl_str_mv | 2015-10-15T16:54:49Z |
| dc.format.none.fl_str_mv | application/pdf |
| dc.identifier.none.fl_str_mv | http://hdl.handle.net/10362/15631 |
| dc.language.none.fl_str_mv | eng |
| dc.rights.none.fl_str_mv | http://purl.org/coar/access_right/c_abf2 |
| dc.subject.none.fl_str_mv | DC-DC power converters Switched capacitor circuits Supercapacitor Performance analyses Design optimization Efficiency |
| dc.title.fl_str_mv | Analysis and implementation of a multi-ratio switched capacitor DC-DC converter for a supercapacitor power supply |
| dc.type.none.fl_str_mv | http://purl.org/coar/resource_type/c_bdcc |
| description | An energy harvesting system requires an energy storing device to store the energy retrieved from the surrounding environment. This can either be a rechargeable battery or a supercapcitor. Due to the limited lifetime of rechargeable batteries, they need to be periodically replaced. Therefore, a supercapacitor, which has ideally a limitless number of charge/discharge cycles can be used to store the energy; however, a voltage regulator is required to obtain a constant output voltage as the supercapacitor discharges. This can be implemented by a Switched-Capacitor DC-DC converter which allows a complete integration in CMOS technology, although it requires several topologies in order to obtain a high efficiency. This thesis presents the complete analysis of four different topologies in order to determine expressions that allow to design and determine the optimum input voltage ranges for each topology. To better understand the parasitic effects, the implementation of the capacitors and the non-ideal effect of the switches, in 130 nm technology, were carefully studied. With these two analysis a multi-ratio SC DC-DC converter was designed with an output power of 2 mW, maximum efficiency of 77%, and a maximum output ripple, in the steady state, of 23 mV; for an input voltage swing of 2.3 V to 0.85 V. This proposed converter has four operation states that perform the conversion ratios of 1/2, 2/3, 1/1 and 3/2 and its clock frequency is automatically adjusted to produce a stable output voltage of 1 V. These features are implemented through two distinct controller circuits that use asynchronous time machines (ASM) to dynamically adjust the clock frequency and to select the active state of the converter. All the theoretical expressions as well as the behaviour of the whole system was verified using electrical simulations. |
| dirty | 0 |
| eu_rights_str_mv | openAccess |
| format | masterThesis |
| fulltext.url.fl_str_mv | https://run.unl.pt/bitstreams/e9bf21ce-b221-44f2-81d7-eae254e4b620/download |
| id | run_e2153bb189e0f83aae67c829c2efc8b4 |
| identifier.url.fl_str_mv | http://hdl.handle.net/10362/15631 |
| inst_facet_str | urn:organizationAcronym:unl{{{_:::_}}}Universidade Nova de Lisboa |
| instacron_str | unl |
| institution | Universidade Nova de Lisboa |
| instname_str | Universidade Nova de Lisboa |
| language | eng |
| network_acronym_str | run |
| network_name_str | Repositório Institucional da UNL |
| oai_identifier_str | oai:run.unl.pt:10362/15631 |
| organization_str_mv | urn:organizationAcronym:unl |
| person_str_mv | Madeira, Ricardo Falé de Carvalho |
| publishDate | 2015 |
| repo_facet_str | urn:repositoryAcronym:run{{{_:::_}}}Repositório Institucional da UNL |
| reponame_str | Repositório Institucional da UNL |
| repository_id_str | urn:repositoryAcronym:run |
| service_str_mv | urn:repositoryAcronym:run |
| spelling | engpt_PTAn energy harvesting system requires an energy storing device to store the energy retrieved from the surrounding environment. This can either be a rechargeable battery or a supercapcitor. Due to the limited lifetime of rechargeable batteries, they need to be periodically replaced. Therefore, a supercapacitor, which has ideally a limitless number of charge/discharge cycles can be used to store the energy; however, a voltage regulator is required to obtain a constant output voltage as the supercapacitor discharges. This can be implemented by a Switched-Capacitor DC-DC converter which allows a complete integration in CMOS technology, although it requires several topologies in order to obtain a high efficiency. This thesis presents the complete analysis of four different topologies in order to determine expressions that allow to design and determine the optimum input voltage ranges for each topology. To better understand the parasitic effects, the implementation of the capacitors and the non-ideal effect of the switches, in 130 nm technology, were carefully studied. With these two analysis a multi-ratio SC DC-DC converter was designed with an output power of 2 mW, maximum efficiency of 77%, and a maximum output ripple, in the steady state, of 23 mV; for an input voltage swing of 2.3 V to 0.85 V. This proposed converter has four operation states that perform the conversion ratios of 1/2, 2/3, 1/1 and 3/2 and its clock frequency is automatically adjusted to produce a stable output voltage of 1 V. These features are implemented through two distinct controller circuits that use asynchronous time machines (ASM) to dynamically adjust the clock frequency and to select the active state of the converter. All the theoretical expressions as well as the behaviour of the whole system was verified using electrical simulations.application/pdfpt_PTAnalysis and implementation of a multi-ratio switched capacitor DC-DC converter for a supercapacitor power supplyMadeira, Ricardo Falé de CarvalhoPaulino, NunoHostingInstitutionOrganizationalRUNe-mailmailto:run@unl.ptrun@unl.pt2015-10-15T16:54:49Z2015-032015-102015-03-01T00:00:00ZHandlehttp://hdl.handle.net/10362/15631http://purl.org/coar/access_right/c_abf2open accessDC-DC power convertersSwitched capacitor circuitsSupercapacitorPerformance analysesDesign optimizationEfficiency10922281 bytesliteraturehttp://purl.org/coar/resource_type/c_bdccmaster thesishttp://purl.org/coar/access_right/c_abf2application/pdffulltexthttps://run.unl.pt/bitstreams/e9bf21ce-b221-44f2-81d7-eae254e4b620/download |
| spellingShingle | Analysis and implementation of a multi-ratio switched capacitor DC-DC converter for a supercapacitor power supply Madeira, Ricardo Falé de Carvalho DC-DC power converters Switched capacitor circuits Supercapacitor Performance analyses Design optimization Efficiency |
| status | SINGLETON |
| subject.fl_str_mv | DC-DC power converters Switched capacitor circuits Supercapacitor Performance analyses Design optimization Efficiency |
| title | Analysis and implementation of a multi-ratio switched capacitor DC-DC converter for a supercapacitor power supply |
| title_full | Analysis and implementation of a multi-ratio switched capacitor DC-DC converter for a supercapacitor power supply |
| title_fullStr | Analysis and implementation of a multi-ratio switched capacitor DC-DC converter for a supercapacitor power supply |
| title_full_unstemmed | Analysis and implementation of a multi-ratio switched capacitor DC-DC converter for a supercapacitor power supply |
| title_short | Analysis and implementation of a multi-ratio switched capacitor DC-DC converter for a supercapacitor power supply |
| title_sort | Analysis and implementation of a multi-ratio switched capacitor DC-DC converter for a supercapacitor power supply |
| topic | DC-DC power converters Switched capacitor circuits Supercapacitor Performance analyses Design optimization Efficiency |
| topic_facet | DC-DC power converters Switched capacitor circuits Supercapacitor Performance analyses Design optimization Efficiency |
| url | http://hdl.handle.net/10362/15631 |
| visible | 1 |