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US 8,299,720 B2Granted
Operating resonant load circuit, dimming circuit and dimming method
AssigneeOsram Sylvania Inc.
InventorZhigang Luo
Life of this patent
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Abstract
An operating resonant load circuit, a dimming circuit and a dimming method are disclosed. The operating resonant load circuit includes: an input unit including a plurality of input terminals, for receiving an AC voltage; a rectifier, for transforming the AC voltage received by the input unit into a DC bus voltage; and a controller, for dividing the DC bus voltage based on an conducting status of the input terminals to output a corresponding DC reference voltage. The dimming circuit and dimming method use the operating resonant load circuit to perform dimming.
Claims17
An operating resonant load circuit, comprising:
- an input unit including a plurality of input terminals, to receive an Alternating Current (AC) voltage;
- a rectifier, to transform the AC voltage received by the input unit into a Direct Current (DC) bus voltage;
- and
- a controller, to divide the DC bus voltage based on a conducting status of the input terminals to output a corresponding DC reference voltage, wherein the controller comprises:
- a first voltage network, connected between a voltage bus and a reference ground of the circuit;
- a first control branch, comprising a second voltage network connected between a first input terminal of the input unit and the reference ground, and a first resistor and a first transistor connected in series between an intermediate node of the first voltage network and the reference ground, a base of the first transistor being connected to an intermediate node of the second voltage network;
- and
- a second control branch, comprising a third voltage network connected between a second input terminal of the input unit and the reference ground, and a second resistor and a second transistor connected in series between the intermediate node of the first voltage network and the reference ground, a base of the second transistor being connected to an intermediate node of the third voltage network.
5 more elements
A dimming circuit, comprising:
- an operating resonant load circuit, wherein the operating resonant load circuit comprises:
- an input unit including a plurality of input terminals, to receive an Alternating Current (AC) voltage;
- a rectifier, to transform the AC voltage received by the input unit into a Direct Current (DC) bus voltage;
- and
- a controller, to divide the DC bus voltage based on a conducting status of the input terminals to output a corresponding DC reference voltage, wherein the controller comprises:
- a first voltage network, connected between a voltage bus and a reference ground of the circuit;
- a first control branch, comprising a second voltage network connected between a first input terminal of the input unit and the reference ground, and a first resistor and a first transistor connected in series between an intermediate node of the first voltage network and the reference ground, a base of the first transistor being connected to an intermediate node of the second voltage network;
- and
- a second control branch, comprising a third voltage network connected between a second input terminal of the input unit and the reference ground, and a second resistor and a second transistor connected in series between the intermediate node of the first voltage network and the reference ground, a base of the second transistor being connected to an intermediate node of the third voltage network;
- and
- a power driving apparatus, to receive a DC reference voltage from the operating resonant load circuit and to output a driving signal of a corresponding frequency based on the received DC reference voltage.
8 more elements
A method of dimming comprising:
- sensing an input voltage of an input unit;
- determining whether the input voltage is provided at a first input terminal, a second terminal, or both input terminals of the input unit;
- generating, by an operating resonant circuit, a corresponding voltage in response to the input voltage, wherein the corresponding voltage is based on the determined terminal or terminals of the input unit at which the input voltage is provided, wherein generating comprises:
- generating, by an operating resonant circuit, a corresponding voltage in response to the input voltage, wherein the corresponding voltage is based on the determined terminal or terminals of the input unit at which the input voltage is provided, such that:
- the corresponding voltage is a first DC reference voltage when the determined terminal or terminals is only the first input terminal;
- the corresponding voltage is a second DC reference voltage when the determined terminal or terminals is only the second input terminal;
- and
- the corresponding voltage is a third DC reference voltage when the determined terminal or terminals is both the input terminals;
- and
- applying the corresponding voltage to a power driving apparatus, so as to output a corresponding power level, wherein applying comprises:
- applying the first DC reference voltage, the second DC reference voltage or the third DC reference voltage to a power driving apparatus, so as to output a corresponding power level.
8 more elements
Dependencies are inferred from the claim text.