摘要:
A light-emitting system includes first and second solid-state light-emitting components, a current source providing a constant current through the second solid-state light-emitting component, a first instrumentation amplifier detecting a second forward voltage across the second solid-state light-emitting component so as to generate a first detection voltage having a magnitude dependent on the second forward voltage, a compensation voltage module operable to generate a compensation voltage having a magnitude related to the second forward voltage according to the first detection voltage and two reference voltages, and a power control module detecting a first forward voltage across the first solid-state light-emitting component and providing a driving current therethrough that is dependent on the compensation voltage and the first forward voltage and that varies according to ambient temperature.
摘要:
A feedback power control system includes: a multiplying unit receiving a work voltage corresponding to a voltage drop of an electrical component, and a feedback voltage corresponding to a work current flowing through the electrical component, and outputting a measuring voltage corresponding to a consumed power of the electrical component and having a value equal to a product of a value of the work voltage and a value of the feedback voltage; a control unit receiving the measuring voltage from the multiplying unit, and a reference voltage, and outputting a control voltage corresponding to a voltage difference between the measuring voltage and the reference voltage; and a regulating unit providing the feedback voltage to the multiplying unit, and including an amplifier that receives the feedback voltage from a series connection of transistor and a resistor coupled to the electrical component, and the control voltage from the control unit and that controls operation of the transistor.
摘要:
A UPS includes a first transfer switch, a first battery charger, a second transfer switch, a solar energy absorption board, and a second battery charger. The first transfer switch connects a power source to an electrical device. The first battery charger connects the power source to a storage battery for charging the storage battery. An output of the storage battery is connected to the first transfer switch via an inverter. The first transfer switch controls the storage battery to supply power to the electrical device. The second transfer switch is connected between the first battery charger and the storage battery. The second battery charger connects the solar energy absorption board to the second transfer switch. The second transfer switch controls the power source to charge the storage battery via the first battery charger or the solar energy absorption board to charge the storage battery via the second battery charger.
摘要:
A control system includes a clock unit for providing a first clock signal, and a second clock signal having a frequency lower than that of the first clock signal. Three control units are coupled respectively to three light emitting diodes (LED) emitting respectively three different colors. Each control unit is operable based on the clock signals and a corresponding set of first and second reference values to output a driving pulse signal to a corresponding LED such that the corresponding LED is driven by the driving pulse signal to emit light during a corresponding one of first, second and third time periods of a control cycle of the control system.
摘要:
An illumination system includes: a signal receiver device configured to, in response to a coupling signal, generate a receiver-side signal frame including a control code portion based on control information of the coupling signal; a code extracting unit operable to extract the control code portion from the receiver-side signal frame; and a current providing unit operable to provide a driving current through a light emitting component according to the control code portion extracted from the code extracting unit. The driving current has a magnitude dependent on the extracted control code portion.
摘要:
A light emitting system includes: first, second, and reference light emitting components having first, second, and reference forward voltages when driven under constant current, respectively; an instrumentation amplifier for generating a temperature detection voltage with a magnitude dependent on the reference forward voltage of the reference light emitting component; first and second compensation voltage modules each generating a respective one of first and second compensation voltages based at least on the temperature detection voltage; and first and second power control modules providing first and second driving currents through the first and second light emitting components according to the first and second compensation voltages and the first and second forward voltages, respectively.