System and method of remotely connecting and disconnecting the auxiliary power supply of a frequency inverter for variable capacity compressor employed in cooling systems

An electronic control system of a variable capacity compressor (60), comprising an inverter (3) that receives external control signals, and generates signals to drive the compressor, wherein the inverter comprises:

• a power circuit (11) for adjusting the feed voltage of the compressor, with a feed input for alternating current, a continuous voltage bus and a variable amplitude and frequency voltage output to feed the compressor,
• at least one internal processing circuit, and
• an auxiliary power supply (19) that provides internal feed voltages to the inverter and activates the inverter, wherein:
• the inverter also comprises a circuit breaker (10) with a first input that receives from an internal processing circuit of the inverter an external signal to activate the auxiliary power supply (30), a second input that receives from an internal processing circuit of the inverter a signal to maintain the auxiliary supply activated (40) and an output connected to an input of the auxiliary power supply,
• when the external signal to activate the auxiliary supply (30) indicates that the auxiliary supply should be connected, the circuit breaker (10) enables the running of the auxiliary power supply (19), which activates the running of the inverter, and the internal processing circuit of the inverter begins sending, continually, the internal maintenance signal to activate the auxiliary supply (40) to the circuit breaker (10) indicating that the auxiliary supply should be kept connected, and making the circuit breaker keep the auxiliary power supply (19) enabled,
• when the external signal to activate the auxiliary supply (30) indicates that the auxiliary supply should be disconnected, and the internal processing circuit of the inverter stops sending the signal to maintain the auxiliary supply activated (40) to the circuit breaker (10), the circuit breaker (10) disables the auxiliary power supply (19), deactivating the running of the inverter.