Compressor control system and method therefor
AssigneeEmerson Electric Co.
InventorBradley C. Zikes
Life of this patent
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Abstract
A control system and method for controlling operation of a compressor in a device is disclosed. The system includes a line voltage measurement circuit which measures the difference in voltage between a first line voltage and a second line voltage being applied to the device, and a controller having means for storing a first and second threshold voltage, a comparator having an output for comparing the voltage difference to the first and second threshold voltages, and compressor control means for controlling operation of the compressor based on the output of the comparator.
Claims27
A control system for controlling operation of a compressor in a device powered by a line voltage between first and second line voltage terminals, comprising:
- a line voltage measurement circuit for measuring a difference in voltage between the first line voltage terminal and the second line voltage terminal before and during the energizing of the compressor;
- and
- a controller in communication with the line voltage measurement circuit and the compressor, the controller comprising a comparator having an output for comparing the voltage difference to at least one reference threshold voltage, and compressor control means for controlling operation of the compressor based on the output of the comparator.
A method for controlling operation of a compressor in a device powered by a line voltage between first and second line voltage terminals and having a controller, comprising:
- measuring a difference in voltage between the first line voltage terminal and the second line voltage terminal before and during the energizing of the compressor;
- storing at least a first threshold voltage in the controller;
- comparing a peak of the voltage difference to the first threshold voltage;
- and
- controlling operation of the compressor based on the comparison between the voltage difference and the first threshold voltage.
A method for controlling operation of a compressor in a device powered by a line voltage between first and second line voltage terminals and having a controller, comprising:
- measuring a difference in voltage between the first line voltage terminal and the second line voltage terminal before and during the energizing of the compressor;
- storing a threshold voltage in the controller;
- and
- controlling operation of the compressor based on a comparison between a peak of the voltage difference and the threshold voltage.
An HVAC system powered by a line voltage between two line voltage terminals and having a compressor, the system comprising:
- a line voltage measurement circuit configured to produce a difference signal representing a voltage difference between the terminals;
- a controller configured to perform a comparison of a peak of the difference signal to a reference threshold voltage;
- and
- a compressor relay circuit configured to operate the compressor based on the comparison.
A method for controlling operation of an HVAC system powered by a line voltage between first and second line voltage terminals and having a compressor, comprising:
- outputting a signal representing a difference in voltage between the first line voltage terminal and the second line voltage terminal;
- comparing a peak of the output signal to a reference voltage;
- and
- conditioning operation of the compressor on a result of the comparing.
Dependencies are inferred from the claim text.