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Topic: Voltage Control

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	Voltage control oscillator with modulation compensation - Patent 4904964
		Frequency control voltage is derived from the output of the loop filter 50 and is coupled to the oscillator through the resistor 314 and the coupling capacitor 312.
		The filtered control voltage applied to the resistor 314 adaptively adjusts the varactor diode 306 as necessary to maintain constant modulation as the VCO is being tuned across the frequencies of interest.
		As the filtered control voltage increases, the capacitance of the varactor diode 306 as biased by the resistor 314 will decrease, and hence decrease the total capacitance coupled into the main resonant tank of the VCO (the total capacitance is the series combination of the capacitor 312 and the varactor diode 306).
	www.freepatentsonline.com /4904964.html (2187 words)

	Voltage Control
		Controlling the field current permits control of the output voltage.
		The major difference between the various voltage control systems is merely the method by which the field circuit resistance and the current are controlled.
		Voltage control is an imposed action, usually through an external adjustment, for the purpose of increasing or decreasing terminal voltage.
	www.tpub.com /neets/book5/15j.htm (538 words)

	Fuzzy logic-based voltage control of a synchronous generator International Journal of Electrical Engineering Education ...
		Operation of synchronous generators requires that both voltage and frequency are kept as constant as possible.' Frequency is controlled by means of the prime mover as it is proportional to the generator speed.
		The transient analysis of the generator voltage requires the use of a dynamic model of the generator.2 This model is expressed in a reference frame that rotates at the rotor speed (d-q transformation).
		Control of such systems can be achieved by means of adaptive controllers, but they are quite complex to implement and require a lot of computation effort and thus are expensive microcontrollers.
	www.findarticles.com /p/articles/mi_qa3792/is_200010/ai_n8907347 (883 words)

	Thermoelectric compensation for voltage control devices - Patent 4097829
		A tuning compensation device to reduce post-tuning frequency drift in voltage controlled oscillators, comprising a thermoelectric element, such as a wafer of doped semiconductor material, in contact with the junction of a tuning element, such as a varactor diode, to produce a correction to the control voltage and thereby compensate for thermally induced frequency drift.
		In the usual operation of a voltage controlled oscillator, a back-bias voltage, such as the back-bias voltage 3, is applied to the varactor diode to set the oscillator at a desired frequency F.sub.2.
		This voltage is, in effect, a feedback voltage controlled by the junction temperature, which acts to oppose thermally induced changes in the varactor diode capacitance characteristic, such as occur in voltage controlled oscillators whenever the frequency is changed.
	www.freepatentsonline.com /4097829.html (2272 words)

	LabSmith: High Voltage Sequencing FAQ
		Controlled via the computer interface, the rate of output switches is limited by the bus speed: you can switch the function of a single channel at about 500 Hz; you can switch multiple channels simultaneously at about 100 Hz.
		With voltage-regulated outputs, the voltage rise and fall time is typically 0.5 ms, depending on the load.
		With the 6000D the max voltage differential is 6000V, when one channel is set to -3000V and one is set to +3000V.
	www.labsmith.com /voltagecontrolFAQ.html (938 words)

	SC Solutions: Integrated Voltage Controller (Site not responding. Last check: 2007-10-12)
		The bias voltage is the DC component of the voltage between the sputter target and ground.
		A controller was designed and implemented at NVE that compensates for the RF bias voltage fluctuations by adjusting the plasma on-time so as to regulate the time-integrated voltage (for all layers of the same material deposited).
		As a result of voltage control, the standard deviation in the average GMR from wafer-to-wafer was reduced by 65% (down to 0.16% from 0.42%).
	www.scsolutions.com /gmr_controller.html (482 words)

	0 to 10V Analog Control Protocol (Site not responding. Last check: 2007-10-12)
		The output of the controller shall be a steady DC voltage.
		Controllers and output devices shall be provided with a blocking diode (or similar circuit) such that each output presents an open circuit to any source voltage of more than itself.
		Typically the control voltage input is electrically isolated from the dimmer or lighting fixture.
	www.epanorama.net /documents/lights/0to10v.html (1296 words)

	Torch Height Control
		The torch height control uses arc voltage (Tip Voltage) to maintain a consistent distance from the plate while the torch is cutting.
		The current regulator lowers the voltage as the height moves lower and raises as it as the torch moves higher.
		If the tip voltage is higher than the set voltage then THC moves the tip down, this causes the plasma current regulator to bring the voltage down.
	www.cnccontrols.com /thcontrol.asp (604 words)

	High-voltage direct current - Wikipedia, the free encyclopedia
		Controlling power flow in a multiterminal DC system requires good communication between all the terminals; power flow must be actively regulated by the control system instead of by the inherent properties of the transmission line.
		The thyristor is a solid-state semiconductor device similar to the diode, but with an extra control terminal that is used to switch the device on at a particular instant during the AC cycle.
		The controllability of current-flow through HVDC rectifiers and inverters, their application in connecting unsynchronized networks, and their applications in efficient submarine cables mean that HVDC cables are often used at national boundaries for the exchange of power.
	en.wikipedia.org /wiki/High-voltage_direct_current (3791 words)

	electric actuator modulating control, voltage options, potentiometer, three position control, DC modulating card, speed ...
		When the voltage is removed the spring will untrip the relay, energizing the actuator to rotate in the opposite direction.
		The Triac Speed Control is a compact module that extends the operating time of the E-Series AC powered actuator by pulsing the motor on and off.
		Control boxes are available for a variety of local control options, such as local/remote open-off-close and jogging control.
	www.a-tcontrols.com /products/actuators/e-series_actuator_options.html (390 words)

	VOLTAGE CONTROL and the ELECTRIC MUSIC BOX (Site not responding. Last check: 2007-10-12)
		Voltage control may be defined as the use of electrical voltages to determine the instantaneous values of musical parameters.
		And the sources of control voltages have been limited to relatively simple function generators, subsonic audio sources, and monophonic, dynamically unresponsive organ keyboards.
		In the Electric Music Box, a consistent distinction is maintained between control voltages (which define musical structure) and signals (the raw material of electronic music).
	www.buchla.com /historical/b200/voltage_control.html (225 words)

	High Voltage Microprocessor Controlled Power Supply
		The B+ control voltage from the MAX5250 is fed to the inverting input of Amplifier "B" of the TCL2274 which simply serves as a buffer.
		For the C- circuit, the DAC control voltage is fed into Amplifier "A" of the TLC2274 where it is inverted to provide negative voltage gate drive.
		A voltage doubler circuit was used in the Heath IP-17 and I use a similar setup for the microprocessor controlled supply, using a pair of 1N4007 diodes and 330uF/450V capacitors.
	www.tech-diy.com /hvMCUps.htm (2057 words)

	Education - LCA Guide to Lighting Control
		Line voltage controls tend to be less expensive, but less flexible, than low voltage controls.
		If the area does not require low voltage components such as light-level sensors, a line voltage control may be adequate.
		Drawings, showing control locations, circuiting, and a control zone diagram to show which luminaires are controlled by which device and how the controls are interrelated.
	www.aboutlightingcontrols.org /education/tutorial11.shtml (802 words)

	Dual Voltage Tracking Circuit for I/O, Microprocessor, and DSP Core Voltages - Maxim/Dallas
		Typical requirements are that the core and I/O voltages not differ from one another more than a small specified amount during power up/down, and that the voltages not be out of tolerance longer than a few tens of milliseconds during power up or power down.
		The /SDO\ output of the first controller is connected to the UVLO input of the next controller in daisy-chain manner, and /SDO\ of the final controller in the series is used to enable all low-voltage regulators.
		The +3.3V output voltage rate of rise is controlled by C21, and the +1.5V and +1.8V rate of rise is controlled by the enable characteristics of the converters themselves.
	www.maxim-ic.com /appnotes.cfm/appnote_number/2391 (3870 words)

	Principles of AC voltage control
		The amount of voltage induced in the windings depends mainly on three things: (1) the number of conductors in series per winding, (2) the speed (alternator rpm) at which the magnetic field cuts the winding, and (3) the strength of the magnetic field.
		This prevents the use of the alternator rpm as a means of controlling the voltage output.
		Thus, the only practical method for obtaining voltage control is to control the strength of the rotating magnetic field.
	www.tpub.com /neets/book5/17e.htm (429 words)

	UL \| UL Standards
		Flame control panels are classified only as to electrical fire and shock hazards incident to their use in ordinary locations.
		An open type combination motor controller is intended for factory installation in a switchboard, motor control center, industrial control panel or the like, or for field installation in an enclosure for industrial control equipment, a cabinet or cutout box.
		Reconditioned miscellaneous solid state motor controllers and their accessories are factory reconditioned to the extent necessary by disassembly and reassembly using new or reconditioned component parts.
	www.ul.com /controlequipment/description.html (2045 words)

	About Voltage
		The Vericept and Voltage integrated solution will enable enterprises, for the first time, to gain visibility into all insider risks and the ability to ensure proprietary information leaving the organization is protected against unauthorized access without any user intervention.
		Voltage Security, Inc. provides the market leading Voltage Enterprise Privacy Management Platform™, a breakthrough foundation for securing all forms of digital business communication flowing into and outside an organization.
		Voltage Security markets its own enterprise solutions including the Voltage SecureMail Gateway™, Voltage SecureMail™ and secure mobile messaging solutions for RIMs BlackBerry® and Microsoft Windows Mobile-based Pocket PCs and Smartphones, and partners with other leading companies such as CipherTrust, FrontBridge Technologies (a Microsoft company) and Proofpoint to serve the expanded security needs of the enterprise.
	www.voltage.com /about/pressreleases/PR060214c.htm (850 words)

	Industrial Control Designline \|Designing with ultra-low voltage MOSFET arrays
		Where the threshold voltage is linearly shifted, the gate control voltages must also shift accordingly relative to the threshold voltage shift in order to turn on, modulate or turn off a specific depletion mode EPAD MOSFET device.
		With a controlling or modulating voltage, this current source can be configured to become a normally-on current source, starting current sink at 0.0V at the output terminal and yet can also be modulated or turned-off with an external applied control signal.
		Due to the extension of voltage and current ranges to lower limits and the precision threshold voltages, a new mindset and a fresh look at many old circuits and their related design configuration issues may be appropriate.
	www.industrialcontroldesignline.com /howto/170700359 (5928 words)

	High Voltage Power Supply - PS300
		The polarity cannot be controlled via the computer interface and can only be changed while the unit is off.
		The voltage monitor output can also be configured as a voltage control input.
		Additionally, the bandwidth of the voltage control input is limited by the overall slew rate specification of the instrument (0 % to 100 % of full scale in less than 0.3 s under full load).
	www.thinksrs.com /products/PS300.htm (671 words)

	transient voltage filters, voltage relays, current relays - R-K Electronics
		Transient voltage filters are used to suppress the electrical voltage transients that can damage or effect the operation of solid state controls.
		Single phase voltage relays are used in applications where the equipment or controls being operated could operate incorrectly or be damaged by low voltage.
		As the control voltage drops, some of the solid state equipment may not continue to work correctly, but a contactor or solenoid valve may continue to stay energized.
	www.rke.com /electronics.htm (1737 words)

	ADI - Analog Dialogue \| Fan Speed Control
		Linear control: At the next level of fan control, linear control, the voltage applied to the fan is variable.
		For example, a 12-V fan with a control voltage range from 7 V to 12 V could be running at half speed at 7 V. The situation is even worse with a 5-V fan.
		In this approach, the voltage applied to the fan is always either zero or full-scale—avoiding the problems experienced in linear control at lower voltages.
	www.analog.com /library/analogDialogue/archives/38-02/fan_speed.html (2185 words)

	Voltage Regulator Accessories
		One is the Series Boost Option that maintains a constant power input for the voltage regulator and the other is the Current Boost System that supplies needed excitation directly into the field of the generator along with the regulator output.
		The manual voltage controller allows for operator control of the generator's voltage when the automatic voltage regulator is removed from the voltage control loop.
		Control signals are sent from the SCP250 to the voltage regulator to maintain the generator's VAr or Power Factor within a regulation band prescribed by the customer.
	www.basler.com /html/rscacc.htm (812 words)

	40973 Da-Lite Single Motor Low Voltage Control System
		It is possible to control the screen from any number of 3-button switches, or computer controls.
		The Switch Control, complete with a painted cover plate, may be flush mounted on any wall in a standard single gang electrical box.
		The 3-button Switch Control allows you to move the screen, up or down and stop it any position when you momentarily press either the UP, DOWN or STOP buttons as instructed.
	www.adorama.com /DLLVCSM.html (320 words)

	Data Privacy Solutions - Enterprise Privacy Management - Secure Messaging
		Voltage's Enterprise Privacy Management Platform provides a common framework for applying security and enforcing policies for data flowing inside and outside the organization.
		Voltage IBE combined with Tablus Content Alarm DT will provide visibility and control over confidential information on the desktop, enabling organizations to audit actions, monitor threshold behaviors for anomalies, enforce policies, and safeguard information by using Identity-Based Encryption to protect sensitive information that leaves the desktop.
		Voltage and Tablus are the first to deliver a comprehensive and innovative solution to safeguarding data privacy.”
	www.voltage.com /products/dataprivacy.htm (1106 words)

	Mechoshade - Electronic Control Systems
		A microprocessor-based 4-motor controller, specializing in multi-level control and uniformity while controlling standard tubular motors.
		The IQ/MLC offers a refined user interface for discriminating control of shade position, overlapping group control, incremental positioning, shade alignment and integration with other control systems and automation sensors.
		Shades may only be stopped at up; down or one of the three intermediate stop positions assuring modular uniformity for the project.
	www.mechoshade.com /site/electroniccontrolsystems/low_voltage_iqmlc.cfm (264 words)

	Low Voltage Industrial Control (Bestact) (Site not responding. Last check: 2007-10-12)
		Yaskawa's Bestact™ "Best Contact" power reed switch products provide unparalleled levels of reliability coupled with broad control switching ability, giving design engineers and end users incomparable performance capability.
		Bestact™ is a hermetically sealed, high power (up to AC 250V) inductive -rated reed switch employed in a variety of control products achieving incomparable reliability (20x solid state).
		This product was designed for use in large scale industrial control systems to increase overall system reliability and for important civic applications where failure is not tolerated.
	www.yaskawa.com /site/products.nsf/productGroup/LowVoltageSwitches.html (167 words)

	Engineering Industries : Wireless Low Voltage Lighting
		This versatile system is the easiest and least expensive way to turn all existing and new low-voltage lighting installations into a zoned system with wireless control.
		Controllers remain in the user’s on or off position regardless of power interruptions (allows other equipment such as wall switches and timers to continue normal operation when remote system is not being used)
		Controller modules can be used for remote switching in other low-voltage applications like low-voltage water features.
	www.ei-products.com (296 words)

	Control
		For voltage control I had to use 2 Variac's in parallel because they were only rated for 10 amos each.
		On the low voltage side of the optoisolator you need a simple DC power supply to provide power for the opto.
		For remote controls this isolation from the AC line is essential for safety.
	home.att.net /~allencoilpage/control.htm (1216 words)

	PRISM Automatic Voltage Control
		Control feeder voltage to minimum legal limits during peak demand, resulting in demand reduction.
		We'll be gathering in Atlanta April 29-May 4 for the 30th annual meeting of Advanced Control Systems users.
		Contents © 2006 Advanced Control Systems, Inc. All trademarks are the property of their respective owners.
	www.acsatlanta.com /pages/dms_avc.html (86 words)

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