Ademco Inc.

Honeywell International Inc.

Hyunki Kim

Robert D Juntunen

Anh Nguyen

David Mulhouse

Anuj Kohli

Liliana Reategui

Jesus Omar Ponce

John Erdman

A switch circuit configured to receive power from either a single power source or dual power source. The circuit includes two power input terminals and two power output terminals. For a single power source, the switch circuit may receive the single power source at either of the two power input terminals. The switch circuit provides power to a load without regard to which of the power input terminals the single power source is connected. The switch circuit shorts the power output terminals for a single power input, which provides power at both power output terminals. For a dual power source system, the switch circuit may isolate the two power output terminals so each power output terminal may operate independently without shorting. In some examples, the switch circuit may be part of a thermostat or similar HVAC system controller.

Thermostat power wire switching circuit

A device for detecting a wire configuration connecting a thermostat and HVAC equipment includes fan controller circuitry, AC controller circuitry, switching circuitry, and processing circuitry. The fan controller circuitry is configured to operate a fan unit of the HVAC equipment using a G pin in a first wire configuration and using a K pin in a second wire configuration. The AC controller circuitry is configured to operate an AC unit of the HVAC equipment using a Y pin in the first wire configuration and the K pin in the second wire configuration. The switching circuitry is configured to refrain from electrically coupling the Y pin and the K pin in response to a deactivation signal. The processing circuitry is configured to determine the HVAC equipment is in the first wire configuration in response to determining the AC controller circuitry receives power while outputting the deactivation signal to the switching circuitry.

Thermostat wire detection

A fluid sensing system and approach having a leak sensor. The leak sensor may output a signal when a fluid is detected. The signal may go to an alarm circuit which can sound a warning or alert. The signal may also go to a control interface of a piece of equipment, such as a water heater, to shut off the piece equipment in an event that it is causing a leak of fluid. Also, the sensing system may have a low battery sensor and indicator in case a battery supplying power for the sensing system is running low. The sensing system may be made of analog circuitry and discrete components.

Micro power water leak detector

An HVAC controller may be configured to control any of a variety of different types of HVAC systems that may include any of a variety of different HVAC components. The HVAC controller may be configured to solicit inputs from an installer or other user that enables the HVAC controller to help prioritize installer setup parameter settings for the HVAC controller to properly control the particular HVAC equipment that is present at the installation.

HVAC controller with streamlined setup

A system having a fluid leak detector, an audio detection circuit, and a processor. The fluid leak detector may have an audio alarm. The audio detection circuit may have a sound sensor and an audio-to-electrical signal converter. The processor may have an electrical signal-to-status of fluid presence. The fluid leak detector, the audio detection circuit and the processor may use very little power when in a standby detection mode.

Fluid leak detector alarm mechanism

A circuit for ensuring ultra-low power relay switching to control an AC load and extend a battery's lifetime. A control circuit may be designed to work where power is provided at very low duty cycles in that the on-time of applied voltage is quite short compared to its off-time. During the on-time, power such as that from a battery may be consumed to drive the circuit but overall such consumption of power is almost miniscule, for instance, a few microamperes or less from a three volt battery. An input FET may drive a pair of switching FETs that provide pulses to a transformer which provides a ramp of voltage that remains above zero volts to a pair of AC switch FETs. An output of the AC switch may go to operate relays of a wire saver for operating one or more thermostats.

Growing community of inventors

Rogers, MN, United States of America

Hyunki Kim