# US 2014/0197808 A1 · Dc-dc converter > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0197808 A1 - Document ID: US20140197808A1 - Status: Published application - Kind: A1 - Application number: 13/894,394 - Filed: 2013-05-14 - Published: 2014-07-17 - Earliest claimed: 2013-01-11 - Assignees: Green Solution Technology Co., Ltd. - Applicants: Green Solution Technology Co., Ltd. - Inventors: Li-Min LEE; Chao SHAO; Shian-Sung SHIU; Quan GAN - Web page: https://patentgrep.com/patent/US20140197808A1 ## CPC - H02M 3/158: including plural semiconductor devices as final control devices for a single load - H02M 3/156: with automatic control of output voltage or current, e.g. switching regulators - H02M 3/1566: {with means for compensating against rapid load changes, e.g. with auxiliary current source, with dual mode control or with inductance variation} - H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P) ## Abstract A DC-DC converter, adapted to control a converting circuit to convert an input voltage into an output voltage, is disclosed. The converting circuit comprises a switch module and an LC filter, the switch module is coupled to the input voltage, and the LC filter is coupled to the switch module and provides the output voltage. The DC-DC converter comprises a system control circuit, a driver circuit, and an output voltage adjusting circuit. The system control circuit generates a switch control signal according to a reference voltage and a state of the LC filter. The driver circuit controls the switch module according to the switch control signal for adjusting the output voltage in response to the reference voltage. The output voltage adjusting circuit determines whether adjusting the output voltage toward a predetermined adjusting voltage according to an adjusting reference voltage and a detecting voltage indicative of the output voltage. ## Claims ### Claim 1 A DC-DC converter, adapted to control a converting circuit to convert an input voltage into an output voltage, wherein the converting circuit comprises a switch module coupled to the input voltage and an LC filter coupled the switch nodule to generate the output voltage, the DC-DC converter comprising: a system control circuit for generating a switch control signal according to reference voltage and a state of the LC filter; a driver circuit for controlling the switch module according to the switch control signal to adjust the output voltage in response to the reference voltage; and an output voltage adjusting circuit, coupled to the LC filter, the output voltage adjusting circuit being configured for determining whether adjusting the output voltage according to a adjusting reference voltage and a detecting voltage indicative of the output voltage, and if yes, the output voltage adjusting circuit adjusts the output voltage toward a predetermined adjusting voltage. ### Claim 2 (depends on 1) The DC-DC converter of claim 1, wherein the output voltage adjusting circuit comprises a discharging judging circuit and a discharging circuit, the discharging judging circuit generates a discharging judging signal according to the adjusting reference voltage and the detecting voltage and the discharging circuit reduces a stored power in the LC filter according to the discharging judging signal. ### Claim 3 (depends on 2) The DC-DC converter of claim 2, wherein the output voltage adjusting circuit stops the discharging circuit reducing the stored power in the LC filter when one of the following conditions being happened: a. the discharging circuit reduces the stored power in the LC filter for a predetermined adjusting time period; and b. the output voltage reaches an adjusting target voltage. ### Claim 4 (depends on 2) The DC-DC converter of claim 2, wherein the discharging circuit comprises a current source, the current of the current source is set according to an over-current value of the DC-DC converter. ### Claim 5 (depends on 2) The DC-DC converter of claim 2, wherein the discharging circuit comprises a current source, the current of the current source is adjusted according to the output voltage and the reference voltage. ### Claim 6 (depends on 2) The DC-DC converter of claim 2, wherein the system control circuit activates the output voltage adjusting circuit when the system control circuit judges the DC-DC converter operating in a power-saving mode. ### Claim 7 (depends on 1) The DC-DC converter of claim 1, wherein the output voltage adjusting circuit comprises a charging judging circuit and a charging circuit, the charging judging circuit generates a charging judging signal according to the adjusting reference voltage and the detecting voltage, and the charging circuit increases a stored power in the LC filter according to the charging judging signal. ### Claim 8 (depends on 7) The DC-DC converter of claim 7, wherein the system control circuit activates the output voltage adjusting circuit when the system control circuit judges the DC-DC converter operating in a power-saving mode. ### Claim 9 (depends on 7) The DC-DC converter of claim 7, wherein the output voltage adjusting circuit stops the charging circuit increasing a stored power in the LC filter when one of the following conditions being happened: a. the charging circuit increases the stored power in the LC filter for a predetermined adjusting time period; and b. the output voltage reaches an adjusting target voltage. ### Claim 10 (depends on 1) The DC-DC converter of claim 1, wherein the system control circuit activates the output voltage adjusting circuit when the system control circuit judges the DC-DC converter operating in a power-saving mode. ### Claim 11 A DC-DC converter, adapted to control a converting circuit to convert an input voltage into an output voltage, wherein the converting circuit comprises a switch module coupled to the input voltage and an LC filter coupled to the switch module to generate the output voltage, the DC-DC converter comprising: a system control circuit for generating a switch control signal according to a reference voltage and a state of the LC filter; a driver circuit for controlling the switch module according to the switch control signal to adjust the output voltage in response to the reference voltage; and an output voltage adjusting circuit, coupled to the driver circuit, the output voltage adjusting circuit being configured for determining whether adjusting the output voltage according to an adjusting reference voltage and a detecting voltage being indicative of the output voltage, and if yes, the output voltage adjusting circuit controls the driver circuit to turn on the switch module to adjust the output voltage toward a predetermined adjusting voltage. ### Claim 12 (depends on 11) The DC-DC converter of claim 11, wherein the system control circuit activates the output voltage adjusting circuit when the system control circuit judges the DC-DC converter operating in a power-saving mode.