Solid-State Lighting With A Control Gear Cascaded By A Luminaire

A light-emitting diode (LED) lighting system, comprising:

• a luminaire, comprising:
• one or more LED arrays with an LED forward voltage;
• and
• a power supply unit, comprising:
• at least two electrical conductors;
• an input filter configured to suppress electromagnetic interference (EMI) noises;
• a main full-wave rectifier coupled to the at least two electrical conductors, the main full-wave rectifier configured to convert a voltage inputted from the at least two electrical conductors into a fourth direct-current (DC) voltage;
• a power switching converter comprising a main transformer and a power factor correction (PFC) and power switching circuit, wherein the PFC and power switching circuit is coupled to the main full-wave rectifier via the input filter and configured to improve a power factor, to reduce voltage ripples, and to convert the fourth DC voltage into a fifth DC voltage, wherein the fifth DC voltage is configured to couple to the one or more LED arrays to operate thereon, and wherein the power switching converter further comprises a pulse width modulation (PWM) control circuit and a pair of input ports configured to receive a 0-to-10 V (volts) signal, a 1-to-10 V (volts) signal, a PWM signal, or a signal from a variable resistor for luminaire dimming applications;
• and
• an LED luminaire control gear, comprising:
• a rechargeable battery;
• a full-wave rectifier configured to be coupled to alternating current (AC) mains to convert a line voltage from the AC mains into a first DC voltage;
• a charging circuit comprising a first transformer, a feedback control circuit, a control device, a first electronic switch, a diode, a first ground reference, and a second ground reference electrically isolated from the first ground reference, wherein the charging circuit is coupled to the full-wave rectifier and configured to convert the first DC voltage into a second DC voltage that charges the rechargeable battery to reach a third DC voltage, and wherein the feedback control circuit is configured to monitor the second DC voltage and to regulate the control device in response to various charging voltage and current requirements;
• a current-fed inverter comprising a second transformer having a primary side and a secondary side, wherein the secondary side comprises at least two windings, wherein the current-fed inverter is configured to receive the third DC voltage from the rechargeable battery and to convert the third DC voltage into at least one high output voltage compatible to a voltage in an input operating voltage range of the power supply unit and at least one low DC output voltage compatible to a voltage in a range of 0-to-10 volts when the line voltage from the AC mains is unavailable;
• and
• a line voltage detection and control circuit comprising a relay switch, wherein the line voltage detection and control circuit is configured to enable or disable the current-fed inverter according to availability of the AC mains, and wherein the relay switch comprises a power sensing coil with a pick-up voltage and a drop-out voltage and is configured to couple either the at least one high output voltage or the line voltage from the AC mains to the power supply unit to operate thereon, subsequently powering up the one or more LED arrays connected with the power supply unit,
• wherein:
• the at least one low DC output voltage is coupled to the PWM control circuit via the pair of input ports and configured to control the fifth DC voltage to be greater than the LED forward voltage for the one or more LED arrays to operate, avoiding instability of the fifth DC voltage due to a constant current operation of the power switching converter;
• the relay switch further comprises a first pair of input electrical terminals, a second pair of input electrical terminals, and a third pair of input electrical terminals, wherein the first pair of input electrical terminals are configured to couple to the line voltage from the AC mains, wherein the second pair of input electrical terminals are configured to couple to the at least one high output voltage, and wherein the third pair of input electrical terminals are configured to receive the pick-up voltage to operate the power sensing coil;
• and
• the relay switch further comprises a pair of output electrical terminals configured to relay either the line voltage from the AC mains or the at least one high output voltage to the power supply unit to operate thereon.