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US 4,211,940 AGranted
Electronic power control device
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorShunji Minami
Life of this patent
Estimating the term…
Abstract
An electronic power control device including two R-S flip-flops, two diodes, an analog memory consisting of a MOS field-effect transistor, a nonpolarized capacitor and an analog switch, and a firing circuit interconnected between the ground and a trapezoidal waveform power level source, whereby a power delivered to a load may be stepped up or down instantaneously or may be maintained constant. When the load is an incandescent lamp, the latter may be instantaneously turned on or off by a simple "push-on" of a switch.
Claims4
An electronic power control device, comprising:
- (a) a first R-S flip-flop with a set input terminal connected through an UP switch to a DC power source and a reset input terminal connected through a DOWN switch to said DC power source,
- (b) a second R-S flip-flop with a set input terminal connected through first and second diodes to said set and reset input terminals of said first R-S flip-flop and a reset input terminal connected through a STOP switch to said DC power source,
- (c) an analog memory comprising
- an input resistor with one end connected to an output terminal of said first R-S flip-flop,
- an analog switch one end of which is connected to the other end of said input resistor and which is enabled or disabled in response to the output from said second R-S flip-flop,
- a nonpolarized capacitor interconnected between the other end of said analog switch and the ground, and
- a MOS field-effect transistor with the gate connected to said other end of said analog switch, the drain connected to A DC power source and the source connected to an output terminal and connected to a source of reference potential through an output resistor,
- (d) a firing circuit coupled to said analog memory output terminal and connected in series with a control resistor and a firing capacitor, and means for interconnecting said firing circuit between a source of reference potential and a generally trapezoidal waveform power source in such a way that said firing circuit may be fired or rendered conductive in response to a predetermined level of voltage charged across said firing capacitor, and
- (e) a semiconductor device for controlling the level of voltage charged across said firing capacitor in response to the output from said analog memory.
6 more elements
Dependencies are inferred from the claim text.