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Class 323/243 - As input to comparator


Subclass of Class 323 - Electricity: power supply or regulation systems
Definition: Subject matter wherein the gradually changing signal is
No. of patents: 51
Last issue date: 12/13/2011


1    
NumberTitleIssue Date
8076913Voltage converters and voltage generating methods for generating output voltage signals according to a pulse width modulation signal
A voltage converter is provided. The voltage converter generates an output voltage signal and comprises a controller, a wave generator, a comparator, and a voltage converting unit. The controller generates a control voltage signal according to the output voltage sig...
12/13/2011
7397262Burn-in system power stage
A burn-in system includes a testing stage configured to stress test one an integrated circuit and a power stage having a voltage control mode and a current control mode. The power stage is configured to supply power to the testing stage. One embodiment of the power ...
07/08/2008
7382303Non-perturbing power supply margin controller
A power supply margin controller may alter the voltage of a control signal used to control the output voltage of a power supply. The controller may include a digital-to-analog converter having an input and an output, and a comparator having a first input coupled to ...
06/03/2008
7339331Dimmer circuit with improved ripple control
A dimmer circuit arrangement is disclosed including a second control circuit for controlling the operation of a triac for delivering current to a load, and a first control circuit for controlling the operation of an IGBT power semiconductor switch for controlling th...
03/04/2008
7259524Apparatus and methods for regulating delivery of electrical energy
Apparatus and methods for regulating delivery of electrical energy to a lighting load are disclosed. An electrical waveform is received from a source of electrical energy. An integration value is generated based on a square of an amplitude of the received waveform. ...
08/21/2007
7193337System and method utilizing a solid state power controller (SSPC) for controlling an electrical load of a variable frequency three-phase power source
A solid state power controller (SSPC) (100) includes a power switching controller (30) and power switching devices (PSDs) (20A, 20B, 20C) for controlling each phase of a multiple-phase load to switch-on or -off at a zero-crossing p...
03/20/2007
7190893Fluid heater with low porosity thermal mass
A fluid heater apparatus and method of making same includes a low porosity material, thermally conductive mass. A heat source is disposed in the thermally conductive mass for imparting heat to the mass. Fluid in a flow path through the mass absorbs heat from the mas...
03/13/2007
6952524Fluid heater temperature balancing apparatus
A fluid heater apparatus supplies heat to wash fluid via a flow path in a thermally conductive body. A heat source is disposed in the thermally conductive body for imparting heat to the body. Fluid flowing through the thermally conductive body in a flow path envelop...
10/04/2005
6912357Fluid heater
A fluid heater apparatus supplies heat to wash fluid via a continuous, labyrinthian flow path in a thermally conductive body. A heat source is disposed in the thermally conductive body for imparting heat to the body. Fluid flowing through the thermally conductive bo...
06/28/2005
6906477Linear control device for controlling a resistive and/or an inductive and/or a capacitive load
An energy savings device for an inductive, resistive or capacitive load that fluorescent lighting fixture. A setting unit allows a user to set a desired power operating level for the load, and outputs a setting signal as a result thereof. A processor receives the se...
06/14/2005
6111393Phase-controlled voltage regulation with minimal energy loss
A phase-controlled voltage regulator of the series type, for supplying A.C. and D.C. electric loads in electronic ignition systems for internal-combustion engines. The A.C. and/or D.C. electric load is connectable in series with a single winding magneto g...
08/29/2000
5995391Control arrangement for a multilevel convertor
A control arrangement for a multilevel convertor employs an AC reference signal which is locked to the AC system frequency and is compared with a number of DC threshold levels. Intersections of the reference signal and threshold levels triggers the firing...
11/30/1999
5644214Power factor correction circuit
A continuous current type power factor correction circuit in a power device having rectifying means for rectifying an alternating current, a booster converter having an inductor, a diode and a capacitor series connected to an output terminal of the rectif...
07/01/1997
5510679Reverse phase-controlled dimmer with integral power adjustment means
Reverse phase-controlled dimming of an a.c.-powered load is accomplished by switching power to the load on and off during each half cycle. In one embodiment of the present invention, power is switched on when line voltage is substantially equal to load vo...
04/23/1996
5268631Power control system with improved phase control
An improved phase-controlled power control apparatus includes a semiconductor switching element for varying the effective power delivered to a load from the power lines. The conduction angle of the semiconductor power switch element is varied from a nomin...
12/07/1993
5038081Reverse phase-controlled dimmer
Reverse phase-controlled dimming of an a.c.-powered load is accomplished by switching power to the load on and off during each half cycle. In one embodiment of the present invention, power is switched on when line voltage is substantially equal to load vo...
08/06/1991
4968927AC power control
A device for regulating delivery of power from an AC voltage source to a load such as a lamp, a motor, a heating element or the like is described. Electronic circuitry responsive to the AC voltage generates a periodic signal whose magnitude indicates the ...
11/06/1990
4800330AC power control
A device for regulating delivery of power from an AC voltage source to a load such as a lamp, a motor, a heating element or the like is described. Electronic circuitry responsive to the AC voltage generates a periodic signal whose magnitude indicates the ...
01/24/1989
4794507Controlling electrical power
A power controller includes a full-wave bridge rectifier circuit coupled to an A.C. line by a storage inductor with two windings and a saturating inductor. The output of the bridge rectifier is connected to a D.C. output terminal for producing output volt...
12/27/1988
4779038Electric continuous-flow water heater with controllable outlet temperature and electronic power output stage therefor
An electric continuous-flow water heater generates a basic power with heating resistors in heating passages and a controllable power with three heating resistors in heating passages. The controllable power is controlled by a control system through a triac...
10/18/1988
4766363Voltage limiting control system for heat emitting loads
Power from an AC source is applied to a load under control of a power switching triac in response to signals from a feedback loop isolated from line voltage transients by means of a pair of opto-coupling devices respectively connecting the feedback loop t...
08/23/1988
4703197Phase-controlled power switching circuit
The application of a controlled amount of alternating current (AC) power to an electrical load is achieved in a power switching circuit utilizing phase-control. In the switching circuit, a first analog signal is generated and repeats in every half-cycle o...
10/27/1987
4695784Voltage and current limiting phase-triggered battery charger with continuous optimization of charging rate
A battery charging circuit includes a silicon controlled rectifier full wave bridge that has its input connected across a conventional 60 hertz alternating current power line. The output of the bridge provides 120 hertz pulsating direct current to the bat...
09/22/1987
4689548Phase controlled regulator
A phase controlled regulator for selectively connecting a load to an AC source voltage such that substantially constant power is delivered to the load despite fluctuations in the magnitude of the source voltage is comprised of a circuit for detecting the ...
08/25/1987
4688161Regulated power supply apparatus and method using reverse phase angle control
A power converter for converting 60 Hertz line power to 20 kilohertz power for driving a low voltage incandescent lamp (42). A field effect transistor power switch section (12) is connected through bridge rectifiers (10, 32) for charging a capacitor filte...
08/18/1987
4672301Power controller circuit with automatic correction for phase lag between voltage and current
What is proposed is an electronic circuit for controlling the amount of AC power delivered to an inductive or resistive load which continuously measures the actual phase lag between the load current and applied voltage and automatically adjusts the firing...
06/09/1987
4596947Power control circuit arrangements
A power control circuit in which a direct current voltage (Vp) proportional to the a.c. power applied to a load (L) is derived from voltages (Vc and Vv) proportional to the a.c. current flowing in the load (L) and the a.c. voltage across the load, respect...
06/24/1986
4593232Flame simulating apparatus
An apparatus for use with an electrical lamp to control the electrical energy from a source of electrical power to the lamp to simulate the emission of a flame, the apparatus including an intensity controller section having first and second manually adjus...
06/03/1986
4580088Soft-starting phase-control circuit for low voltage load
A soft-starting phase-control circuit for controlling both the cold in-rush and normal operating flows of current through a load from an A.C. source. The load may be resistive, may have a non-zero resistance temperature coefficient and may require a load ...
04/01/1986
4580080Phase control ballast
A phase control ballast in which a reactor and a triac are connected in series with an hid discharge lamp across an ac voltage source. A supra-linear converter connected to a rectifier-filter provides a reference voltage which is a supra-linear function o...
04/01/1986
4524264Temperature control apparatus
A temperature control apparatus detects an actual temperature of an object (e.g., sensor) to be controlled, and compares the actual temperature with a preset target temperature to obtain a difference therebetween, thereby keeping a heater temperature cons...
06/18/1985
4511836Circuit arrangement for power control
The power drawn by a load (RL) from an A.C. network is controlled by an operational amplifier (OP1) and a power transistor (TR2). The operational amplifier makes the transistor leading when the voltage of its inverting input which is derived fr...
04/16/1985
4495405Automatic control system including error processing loop
Automatic control system for controlling the switching point of a device which operates in at least two modes of operation, provides for automatic modification of the error signal which controls the switching action of the device by processing in real tim...
01/22/1985
4426614Pulsed thyristor trigger control circuit
A trigger control circuit is provided for producing firing pulses for the thyristor of thyristor control system such as a power factor controller. The control circuit overcomes thyristor triggering problems involved with the current lag associated with co...
01/17/1984
4396818Thyristor off-time controlled induction heating apparatus by differentiated thyristor anode potential
An induction heating apparatus including a thyristor adapted to receive power from a power source, a gating control circuit for generating gating pulses for application to the gating control terminal of the thyristor, a commutating circuit which commutate...
08/02/1983
4379254Dimmer circuit for fluorescent lamp
An intensity control for fluorescent lamps of the type wherein a triac in series with the lamp provides control of the lamp current. Triac gating is controlled by a novel phase-lock circuit. In the phase-lock circuit, voltage squaring means are provided f...
04/05/1983
4376968Protection system for immunizing an inverter system against A-C line voltage disturbances
When a-c power line voltage is rectified by a phase-controlled SCR rectifier bridge to develop an adjustable d-c bus voltage which is then converted by an inverter back to a-c for driving a load, such as a motor, line voltage disturbances, resulting from ...
03/15/1983
4360783Lamp power regulator
An effective voltage across a load such a lamp (L) is squared by means of a field effect transistor (FET) to produce an output voltage which varies in proportion to the power through the load (L). A trigger phase of a thyristor (TRC) connected between an ...
11/23/1982
4357645System for detecting faulty SCR's
A safety circuit for a silicon controlled rectifier controller of the type wherein the current delivered to a load is determined by controlling the firing angle of the silicon controlled rectifiers. The safety circuit is capable of sensing a shorted condi...
11/02/1982
4281378Frequency inverter
A frequency inverter using thyristor(s), wherein a gate circuit produces both positive triggering signals and negative reverse-bias signals by utilizing outputs of the timer in order not to fail turnings of the thyristor, and the timing of both signals ar...
07/28/1981
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