# US 10,502,481 B2 · Refrigerator > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,502,481 B2 - Document ID: US10502481B2 - Status: Granted - Kind: B2 - Application number: 15/542,048 - Filed: 2016-04-26 - Published: 2018-01-25 - Granted: 2019-12-10 - Earliest claimed: 2015-07-31 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Shinhyun Park; Sun Kim; Byoungsuk Choi; Jinseok Hu - Web page: https://patentgrep.com/patent/US10502481B2 ## CPC - F25D 29/006: {Safety devices} - F25B 49/005: {of safety devices (F25B49/02 and F25B49/04 take precedence)} - G01R 19/04: Measuring peak values {or amplitude or envelope} of AC or of pulses - H02J 9/062: {for AC powered loads} - F25B 2600/01: Timing - F25B 2700/15: Power, e.g. by voltage or current - F25D 21/006: {with electronic control circuits} - F25D 2600/02: Timing - Y02B 10/70: Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies - F25D: REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR (refrigerated showcases A47F3/04; thermally-insulated vessels for domestic use A47J41/00; refrigerated vehicles, see the appropriate subclasses of classes B60 - B64; containers with thermal insulation in general B65D81/38; heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants, or materials for the production of heat or cold by chemical reactions other than by combustion C09K5/00; thermally-insulated vessels for liquefied or solidified gases F17C; air-conditioning or air-humidification F24F; refrigeration machines, plants, or systems F25B; cooling of instruments or comparable apparatus without refrigeration G12B) - F25B: REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS ## Abstract A refrigerator according to an embodiment of the present invention includes a power input part through which power is input from a UPS device connected to a commercial power source and an auxiliary power source; a voltage sensor configured to sense a voltage of the power input through the power input part; and a control part configured to analyze a voltage signal sensed by the voltage sensor and to determine whether the input power is commercial power or auxiliary power. ## Claims ### Claim 1 A refrigerator comprising: a power input part connected to a UPS device which is connected to an auxiliary power source and a commercial power source and selectively supplies power; a compressor; a voltage sensor configured to sense a voltage input through the power input part; and a control part configured to analyze a voltage signal sensed by the voltage sensor and to determine whether the input power is commercial power or auxiliary power, wherein the control part performs a primary determination through an analysis of the sensed voltage signal, performs a secondary determination through the analysis of the voltage signal sensed before and after driving of the compressor when it is determined that the power is not the auxiliary power, and determines whether the input power is the commercial power or the auxiliary power. ### Claim 2 (depends on 1) The refrigerator of claim 1, wherein, in the primary determination, when a waveform of the voltage signal sensed by the voltage sensor is a square wave, the control part determines that the input power is the auxiliary power. ### Claim 3 (depends on 2) The refrigerator of claim 2, wherein, in the secondary determination, when a peak value of a voltage waveform of the compressor is dropped, the control part determines that the input power is the auxiliary power. ### Claim 4 (depends on 2) The refrigerator of claim 2, wherein, in the secondary determination, when amplitude of a third harmonic wave after the driving of the compressor is greater than that of the third harmonic wave before the driving of the compressor, the control part determines that the input power is the auxiliary power. ### Claim 5 (depends on 1) The refrigerator of claim 1, wherein, in the primary determination, when amplitude of a third harmonic wave of the voltage signal sensed by the voltage sensor is equal to or more than a predetermined value, the control part determines that the input power is the auxiliary power. ### Claim 6 (depends on 5) The refrigerator of claim 5, wherein, in the secondary determination, when a peak value of a voltage waveform of the compressor is dropped, the control part determines that the input power is the auxiliary power. ### Claim 7 (depends on 5) The refrigerator of claim 5, wherein, in the secondary determination, when the amplitude of the third harmonic wave after the driving of the compressor is greater than that of the third harmonic wave before the driving of the compressor, the control part determines that the input power is the auxiliary power. ### Claim 8 (depends on 1) The refrigerator of claim 1, wherein the compressor is an inverter compressor, and a point of time after the driving of the compressor is an initial operation time in which a position of a rotor is aligned when the driving of the compressor starts. ### Claim 9 (depends on 1) The refrigerator of claim 1, wherein the voltage sensor is supplied on a power line through which the power is supplied from the power input part to the compressor, and senses the voltage signal supplied to the compressor. ### Claim 10 (depends on 1) The refrigerator of claim 1, wherein, in the primary determination of the control part, when it is determined that the input power is the auxiliary power, the determination of the control part is terminated.