Electric lamp and discharge devices: systems – With radiant energy sensitive control means – Radiant energy controlled regulation of the current supply...
Patent
2000-01-11
2000-12-05
Vu, David
Electric lamp and discharge devices: systems
With radiant energy sensitive control means
Radiant energy controlled regulation of the current supply...
315159, 340565, H05B 3702
Patent
active
061571369
ABSTRACT:
A frequency sensing control device controls current flow through an electrical load and includes a current control circuit to be connected to the electrical load, a logic signal generator having an input port and an output port connected to a control input of the current control circuit, an oscillator connected to the logic signal generator, and a sensing unit connected to the oscillator for sensing human presence. The current control circuit is operable in a normal mode, where the control input receives a first logic signal generated by the logic signal generator when the input port receives a high-frequency signal so as to enable the current control circuit to maintain an initial current flow through the electrical load, and a dimming mode, where the control input receives a second logic signal generated by the logic signal generator when the input port receives a low-frequency signal so as to enable the current control circuit to vary the current flow through the electrical load. The oscillator is operable so as to provide the high-frequency signal to the input port. The sensing unit generates the low-frequency signal, inhibits the oscillator from providing the high-frequency signal to the input port, and provides the low-frequency signal to the input port via the oscillator.
REFERENCES:
patent: 5130613 (1992-07-01), Szuba
Wang Jack
Wang Robert
Ceramate Technical Co., Ltd.
Vu David
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