Input detection and protection circuit
AssigneeLumlux Corp.
InventorsMing Qiu, YuXing Jin, GuanXing Deng
Life of this patent
Estimating the term…
Abstract
An input detection and protection circuit and an AC electronic ballast for HID lamps, including a power input circuit performing a first limitation to an input surge voltage and then performing a second limitation to a residual voltage from the first input surge voltage limitation; an input voltage acquisition circuit feeding back an input voltage to an MCU chip; a pull-in circuit for a relay connecting to a relay in the power input circuit; a PFC circuit, and an MCU chip controlling the PFC circuit to switch on and off according to voltage values input by the input voltage acquisition circuit, and controlling pull-in and drop-out of the relay through the pull-in circuit for the relay.
Claims10
An input detection and protection circuit, wherein the input detection and protection circuit comprising:
- a power input circuit, wherein the power input circuit performs a first limitation to an input surge voltage, and then performs a second limitation to a residual voltage from the first input surge voltage limitation;
- an input voltage acquisition circuit, wherein the input voltage acquisition circuit feeds back an input voltage to an MCU chip of the input detection and protection circuit;
- a pull-in circuit for a relay, wherein the pull-in circuit for the relay is connected to the relay in the power input circuit;
- and
- a PFC circuit,
- wherein the MCU chip controls the PFC circuit to switch on and off according to voltage values input by the input voltage acquisition circuit, and controls pull-in and drop-out of the relay through the pull-in circuit for the relay;
- and
- the power input circuit comprises:
- a first varistor, a second varistor, a thermistor and the relay, and wherein the input surge voltage is firstly limited by the first varistor and then secondly limited by the second varistor and the thermistor.
Dependencies are inferred from the claim text.