# US 8,787,046 B2 · Switch mode power supply device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,787,046 B2 - Document ID: US8787046B2 - Status: Granted - Kind: B2 - Application number: 13/349,390 - Filed: 2012-01-12 - Published: 2013-04-04 - Granted: 2014-07-22 - Earliest claimed: 2011-10-04 - Assignees: Delta Electronics, Inc. - Applicants: Wen-Cheng Hsieh - Inventors: Wen-Cheng Hsieh - Web page: https://patentgrep.com/patent/US8787046B2 ## CPC - H02M 3/33523: {with galvanic isolation between input and output of both the power stage and the feedback loop} - H02M 1/36: Means for starting or stopping converters - H02M 1/0006: {Arrangements for supplying an adequate voltage to the control circuit of converters} - 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 power supply device including a rectifying unit, a supplying unit, a controlling unit, a conversion unit and a detection unit is disclosed. The rectifying unit processes an alternating current (AC) voltage to generate a direct current (DC) voltage. The supplying unit generates an operation voltage according to an input voltage. The controlling unit receives the operation voltage and generating an enabling signal. The conversion unit transforms the DC voltage to generate an auxiliary voltage according to the enabling signal. The auxiliary voltage is not equal to the operation voltage. The detection unit detects the auxiliary voltage. When the auxiliary voltage is generated, the detection unit de-activates the supplying unit to stop generating the operation voltage. ## Claims ### Claim 1 A power supply device, comprising: a rectifying unit processing an alternating current (AC) voltage to generate a direct current (DC) voltage; a supplying unit generating an operation voltage according to an input voltage; a controlling unit receiving the operation voltage and generating an enabling signal; a conversion unit transforming the DC voltage to generate an auxiliary voltage according to the enabling signal, wherein the auxiliary voltage is not equal to the operation voltage; and a detection unit for detecting the auxiliary voltage, wherein when the auxiliary voltage is generated, the detection unit de-activates the supplying unit to stop generating the operation voltage. ### Claim 2 (depends on 1) The power supply device as claimed in claim 1, wherein the input voltage is the AC voltage or the DC voltage. ### Claim 3 (depends on 1) The power supply device as claimed in claim 1, wherein the supplying unit comprises: a start resistor; a turn-on module connected to the start resistor in series; and a storage module connected to the turn-on module in series and storing energy according to the input voltage, wherein the energy stored in the storage module is transformed as the operation voltage. ### Claim 4 (depends on 3) The power supply device as claimed in claim 3, wherein during a start mode, the turn-on module is activated to transmit the input voltage to the storage module and during an operation mode, the detection unit de-activates the turn-on module to stop transmitting the input voltage to the storage module. ### Claim 5 (depends on 4) The power supply device as claimed in claim 4, wherein the turn-on module comprises a relay or a junction field effect transistor (JFET). ### Claim 6 (depends on 3) The power supply device as claimed in claim 3, wherein the turn-on module comprises: a depletion-mode metal oxide semiconductor field effect transistor (MOSFET) comprising a control terminal, a first electrode and a second electrode; and a turn-on resistor coupled between the control terminal and the second electrode. ### Claim 7 (depends on 6) The power supply device as claimed in claim 6, wherein the first electrode is coupled to a first terminal of the start resistor, and a second terminal of the start resistor receives the input voltage. ### Claim 8 (depends on 6) The power supply device as claimed in claim 6, wherein the first electrode receives the input voltage, the second electrode is coupled to a first terminal of the start resistor, and a second terminal of the start resistor is coupled to the storage module. ### Claim 9 (depends on 1) The power supply device as claimed in claim 1, further comprising: an isolation unit coupled between the conversion unit and the controlling unit. ### Claim 10 (depends on 9) The power supply device as claimed in claim 9, wherein the isolation unit is a diode comprising an anode receiving the auxiliary voltage and a cathode coupled to the controlling unit. ### Claim 11 (depends on 1) The power supply device as claimed in claim 1, wherein the detection unit comprises: a voltage divider processing the auxiliary voltage; and a switching module generating a control signal to de-activate the supplying unit according to a processing result of the voltage divider. ### Claim 12 (depends on 11) The power supply device as claimed in claim 11, wherein the voltage divider comprises: a first resistor; a second resistor connected to the first resistor in series between the auxiliary voltage and a ground voltage; and a capacitor connected to the second resistor in parallel. ### Claim 13 (depends on 12) The power supply device as claimed in claim 12, wherein the switching module is a transistor, and the transistor comprises a gate coupled to the second resistor, a drain outputting the control signal and a source receiving the ground voltage.