Carrier Corporation

Delta Electronics, Inc.

Jian Ni

Hui Zhai

Liang Chang

Qing Lu

Guangyu Shen

Xiaojun Guo

Xiaohong Wang

Wen-Shi Huang

Jianping Ying

Tao Peng

Shih-Ming Huang

Pei Sun

Wanbing Jin

Hui Yang

Jingkai Weng

Lishan Wang

Lijian Wu

Jingwei Sun

Xiaoru Li

Zehang Yu

The present application relates to a power failure detection circuit, the circuit comprises: a rectifying circuit for full-wave rectifying an alternating current voltage so as to obtain a first voltage; a switching circuit for converting the first voltage into a periodic voltage pulse; and a judgment circuit for providing an output signal to a fan control circuit for closing a fan when the periodic voltage pulse is not received within a preset time period, and providing the output signal to a micro-control unit for closing an electronic expansion valve. The present application also relates to a control circuit for a variable refrigerant flow VRF system.

Power failure detection circuit and control circuit for VRF system

A hybrid heat system, a capacity allocation control method thereof, a readable storage medium and a control system. The hybrid heat system includes a plurality of modular heat recovery units with an air-conditioning mode and a water-heating mode, and a plurality of modular air-conditioning units with an air-conditioning mode, the capacity allocation control method including: a classification step Sfor classifying the compressors in the plurality of modular heat recovery units and the plurality of modular air-conditioning units according to unit category, unit state and start-stop state; a sorting step Sfor sorting classified compressors according to operating time; and a search step Sfor searching target compressors from sorted compressors based on preset energy efficiency search criteria.

Hybrid heat system, the capacity allocation control method thereof, readable storage medium and control system

The present application relates to a battery box, the battery box comprising: a charging and energy storage unit for charging and storing electrical energy using an input voltage supplied to the battery box; a power failure detection unit for detecting a power failure of the input voltage; and a power output switching unit for switching an output based on a detection result of the power failure detection unit, wherein the power output switching unit is configured to output a voltage from the charging and energy storage unit when the power failure detection unit detects a power failure, and is configured not to output the voltage when the power failure detection unit does not detect the power failure. The present application also relates to an air conditioning system and a control method for the air conditioning system.

Battery pack, air conditioning system, and method for the same

A heat cycle system and a control method. The heat cycle system includes: driving devices, one or a plurality of outdoor units, and a plurality of indoor units, which are connected by pipelines; a bypass pipeline for the plurality of indoor units, a bypass valve being disposed in the bypass pipeline; a pressure sensor that senses a pressure difference &#x394;Pacross the plurality of outdoor units; and a controller that is preset with a pressure difference set value &#x394;P, wherein the controller calculates a pressure offset parameter &#x394;P=&#x394;P&#x2212;&#x394;Pand adjusts an opening degree of the bypass valve based on the pressure offset parameter &#x394;P so that the pressure offset parameter &#x394;P approaches zero, and wherein the controller is preset with a first pressure offset threshold P, and the controller is configured such that closed indoor units enter a bypass mode one by one when &#x394;P&#x3e;P, until &#x394;P&#x2264;P.

Thermal cycling system and control method of the thermal cycling system

An air conditioning system and a control method thereof. The air conditioning system includes: a plurality of indoor units connected in parallel; a plurality of outdoor units connected in parallel; and a coolant circulation circuit which circulates coolant through each of the indoor units connected in parallel and each of the outdoor units connected in parallel respectively, and which exchanges heat with each of the indoor units and each of the outdoor units; wherein the air conditioning system further includes a controller which, based on a number of actively operating indoor units, a total number of the indoor units and a total number of the outdoor units, defines an upper limit of a number of actively operating outdoor units, so that the flow rate of the coolant flowing through the actively operating outdoor units is not lower than a preset flow rate.

Air conditioning system and control method therof

A water circulation system for air conditioning system and a control method thereof, wherein the water circulation loop comprises: a main loop provided with air-conditioning indoor units, air-conditioning outdoor units and an actuator, and a bypass branch connected between upstream and downstream of the air-conditioning outdoor units and provided with a bypass valve; the control method comprises: Sstarting the water circulation system after receiving a start command; Sexecuting a PID control step after initialization and a first preset time period of the water circulation system; Sexecuting a feed forward control step when the operating states of the air-conditioning indoor units and/or the air-conditioning outdoor units are changed, and going back to execute the PID control step after a second preset time period; and Sexecuting a shutdown step of the water circulation system after receiving a shutdown command.

Water circulation system for air conditioning system and control method thereof

A controller of a brushless DC electric machine having a rotor and at least a stator winding powered by a driving voltage is provided. The controller includes a position sensor, an advance angle control circuit, and a driving circuit. The position sensor is moved along a reverse rotating direction of the rotor by a prepositioned angle for outputting a position signal. The advance angle control circuit receives the position signal and a driving voltage reproduction signal reproduced from the driving voltage and outputs a commutation control signal lagging the position signal by a first delay time. The driving circuit receives the commutation control signal for outputting a driving signal for controlling a commutation of the brushless DC electric machine.

Device and method for controlling brushless DC electric machine

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Shanghai, China

Jian Ni