# US 10,480,805 B2 · Thermostat assembly > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,480,805 B2 - Document ID: US10480805B2 - Status: Granted - Kind: B2 - Application number: 15/818,423 - Filed: 2017-11-20 - Published: 2018-03-29 - Granted: 2019-11-19 - Earliest claimed: 2013-03-15 - Assignees: Ademco Inc. - Applicants: Ademco Inc. - Inventors: David Mulhouse; Mohammad Aljabari; Tracy Lentz; Petr Adamik; Tarik Khoury; Steven J. McPherson; Arnold Kalla; Eugene J. Takach - Web page: https://patentgrep.com/patent/US10480805B2 ## CPC - G02F 1/133308: {Support structures for LCD panels, e.g. frames or bezels} - F24F 11/30: for purposes related to the operation of the system, e.g. for safety or monitoring - F24F 11/32: Responding to malfunctions or emergencies - G01K 7/42: Circuits effecting compensation of thermal inertia; Circuits for predicting the stationary value of a temperature - G05D 23/1905: {associated with tele control} - G05D 23/32: with provision for adjustment of the effect of the auxiliary heating device, e.g. a function of time - H01R 4/34: Conductive members located under head of screw - H02G 3/14: Fastening of cover or lid to box - H02H 9/005: {avoiding undesired transient conditions} - H02H 9/04: responsive to excess voltage (lightning arrestors H01C7/12, H01C8/04, H01G9/18, H01T) - H05F 3/00: Carrying-off electrostatic charges ({from shoes A43B7/36}; from living beings A61N1/14; {from tyres B60C19/08; from vehicles B60R16/06; from aircraft B64D45/02; from large containers B65D90/46}) - H05K 1/0254: {High voltage adaptations; Electrical insulation details; Overvoltage or electrostatic discharge protection (electrostatic discharge protection for electric apparatus in general H05K9/0067, H05K9/0079); Arrangements for regulating voltages or for using plural voltages} - H05K 1/111: {Pads for surface mounting, e.g. lay-out} - H05K 3/32: electrically connecting electric components or wires to printed circuits - H05K 5/0018: {having an electronic display} - H05K 7/1422: {Printed circuit boards receptacles, e.g. stacked structures, electronic circuit modules or box like frames} - H05K 7/1427: {Housings} - H05K 9/0037: {Housings with compartments containing a PCB, e.g. partitioning walls} - H05K 9/0054: {specially adapted for display applications} - H05K 13/00: Apparatus or processes specially adapted for manufacturing or adjusting assemblages of electric components - H05K 13/0015: {Orientation; Alignment; Positioning} - F24F 11/52: Indication arrangements, e.g. displays - G02F 1/133314: {Back frames} - G05D 23/1904: {variable in time} - H02G 3/10: for surface mounting on a wall - Y10T 29/49002: Electrical device making - Y10T 29/49124: On flat or curved insulated base, e.g., printed circuit, etc. - Y10T 29/4913: Assembling to base an electrical component, e.g., capacitor, etc. - Y10T 29/49826: Assembling or joining - G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS - F24F: AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING (removing dirt or fumes from areas where they are produced B08B15/00; vertical ducts for carrying away waste gases from buildings E04F17/02; tops for chimneys or ventilating shafts, terminals for flues F23L17/02) - G01K: MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR (radiation pyrometry G01J5/00) - G05D: SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES - H01R: ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS - H02G: INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES - H02H: EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS (indicating or signalling undesired working conditions G01R, e.g. G01R31/00, G08B; locating faults along lines G01R31/08; emergency protective devices H01H) - H05F: STATIC ELECTRICITY; NATURALLY-OCCURRING ELECTRICITY - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A surge protection circuit for an electronic device such as an HVAC controller. In one example, the surge protection circuit may include a first voltage clamp, a second voltage clamp, a resistor, and an output port. The first voltage clamp may provide a first clamping voltage between a power input terminal and a common terminal. The second voltage clamp may provide a second clamping voltage that is less than the first clamping voltage. The resistor may be connected in series with the second voltage clamp, and the series connected resistor and second voltage clamp may be connected in parallel with the first voltage clamp. As such, a surge current at the power input terminal may be split between the first voltage clamp and the second voltage clamp. The amount of surge current that is provided to the second voltage clamp may be set by the value of the resistor. ## Claims ### Claim 1 A thermostat assembly comprising: a back cover; a display; a printed circuit board; and a front cover comprising: one or more first alignment features for aligning the display with the front cover; one or more second alignment features for aligning the printed circuit board with the front cover; a first clip feature for engaging the printed circuit board and holding the printed circuit board in place; one or more second clip features for engaging the back cover; and wherein the front cover, the back cover, the display and the printed circuit board are secured to form the thermostat assembly using only interference connections formed between features of the front cover, the back cover, the display and/or the printed circuit board. ### Claim 2 (depends on 1) The thermostat assembly of claim 1, wherein the display is positioned adjacent the printed circuit board, with the display toward the front cover and the printed circuit board toward the back cover. ### Claim 3 (depends on 2) The thermostat assembly of claim 2, further comprising a spacer positioned between the display and the printed circuit board, wherein the front cover comprises one or more alignment features for aligning the spacer with the front cover. ### Claim 4 (depends on 3) The thermostat assembly of claim 3, wherein the spacer comprises one or more alignment features for aligning the printed circuit board with the spacer. ### Claim 5 (depends on 1) The thermostat assembly of claim 1, wherein the interference connections comprise one or more clip connections. ### Claim 6 (depends on 1) The thermostat assembly of claim 1, wherein the interference connections comprise one or more snap connections. ### Claim 7 (depends on 1) The thermostat assembly of claim 1, wherein the interference connections comprise one or more hinge connections. ### Claim 8 (depends on 1) The thermostat assembly of claim 1, wherein the display and the printed circuit board are housed by the front cover and the back cover. ### Claim 9 A thermostat assembly comprising: a display; a printed circuit board; and a front cover comprising: one or more first alignment features for aligning the display with the front cover; one or more features, including a clip feature, for engaging the printed circuit board and holding the printed circuit board in place with the display between the front cover and the printed circuit board; wherein the front cover, the display and the printed circuit board are secured to form the thermostat assembly using only interference connections between features of the front cover, the display and/or the printed circuit board. ### Claim 10 (depends on 9) The thermostat assembly of claim 9, wherein the display is positioned between the printed circuit board are the front cover. ### Claim 11 (depends on 10) The thermostat assembly of claim 10, further comprising a spacer positioned between the display and the printed circuit board. ### Claim 12 (depends on 11) The thermostat assembly of claim 11, wherein the front cover comprises one or more alignment features for aligning the spacer with the front cover. ### Claim 13 (depends on 11) The thermostat assembly of claim 11, wherein the spacer comprises one or more alignment features for aligning the printed circuit board with the spacer.