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Topic: Silicon controlled rectifier

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	SCR Tutorial
		It is controlled from an off state (high resistance) to the on state (low resistance) by a signal applied to the third terminal, the gate.
		Notice the reverse characteristics are the same as discussed previously for the rectifier or diode, having a breakover voltage with its attending avalanche current; and a leakage current for voltages less than the breakover voltage.
		Obviously, the SCR can also be switched by exceeding the forward breakover voltage, however this is usually considered a design limitation and switching is normally controlled with a gate voltage.
	www.americanmicrosemi.com /tutorials/scr.htm (312 words)

	Zero voltage switching AC relay circuit - Patent 5027020
		The two silicon controlled rectifiers 20 and 22 are arranged so that (when conducting) during the positive half cycles of AC power source 16 when the voltage at terminal 12 is positive with respect to the voltage at the terminal 14, the load current flows through the anode-cathode circuit of the photosilicon controlled rectifier 20.
		The NPN transistor 36 is connected with its collector and emitter at the gate and cathode, respectively, of the rectifier 20; and the NPN transistor 38 is connected with its collector and emitter at the gate and cathode, respectively, of the rectifier 22.
		This allows the silicon controlled rectifier 20 to turn on only in response to the signal provided by the light emitting diode 26 during the period of the window and entirely eliminates the effect of transients in the output load.
	www.freepatentsonline.com /5027020.html (2367 words)

	silicon controlled... on GlobalSpec (Site not responding. Last check: 2007-10-21)
		Silicon Controlled Rectifiers (SCR) (89 companies) Silicon controlled rectifiers (SCR) are four-layer (PNPN) thyristors with three terminals: an input control terminal (gate), an output terminal (anode), and a terminal common to both the input and output (cathode).
		SCRs are used mainly with high voltages and currents, often to control alternating current (AC) where the change of sign causes the device to switch off automatically.
		Silicon Controlled Rectifier (SCR) The Silicon Controlled Rectifier (SCR) is simply a conventional rectifier controlled by a gate signal.
	semiconductors.globalspec.com /Industrial-Directory/silicon_controlled... (1341 words)

	Radio-Electronics.Com :: Thyristor or Silicon Controlled Rectifier (SCR)
		The control terminal of the SCR is named the gate and it is connected to the p-type layer located next to the cathode.
		The anode of the SCR or silicon controlled rectifier is usually bonded to the package since the gate terminal is near the cathode and needs to be connected separately.
		The transistor with its emitter connected to the cathode of the thyristor is a n-p-n device whereas the transistor with its emitter connected to the anode of the SCR is a p-n-p variety.
	www.radio-electronics.com /info/data/semicond/thyristor/thyristor.php (816 words)

	The Silicon-Controlled Rectifier (SCR) - Chapter 7: THYRISTORS - Volume III - Semiconductors (Site not responding. Last check: 2007-10-21)
		Controlled bridge rectifiers are not limited to single-phase designs.
		SCRs may be fired by intentional triggering of the gate terminal, excessive voltage (breakdown) between anode and cathode, or excessive rate of voltage rise between anode and cathode.
		SCR terminals may be identified by a continuity meter: the only two terminals showing any continuity between them at all should be the gate and cathode.
	www.allaboutcircuits.com /vol_3/chpt_7/5.html (2876 words)

	Low-noise silicon controlled rectifier for electrostatic discharge protection - Patent 6633068
		Accordingly, the present invention is directed to a low-noise silicon controlled rectifier substantially and a substrate-biased low-noise silicon controlled rectifier that obviate one or more of the problems due to limitations and disadvantages of the related art.
		Although the embodiments the SCR of the present invention are generally described as having been formed in a layer of polysilicon, i.e., PSCR, one skilled in the art would understand that the SCR of the present invention may also be formed in a layer of silicon.
		The low-noise silicon controlled rectifier is isolated from a substrate of the CMOS device.
	www.freepatentsonline.com /6633068.html (6024 words)

	SCR - SCRipt, Silicon Controlled Rectifier, Standard Context Routing, Sustainable Cell Rate
		Sustainable Cell Rate: The SCR is an upper bound on the conforming average rate of an ATM connection over time scales which are long relative to those for which the PCR is defined.
		A silicon device with four layers (PNPN) having an input control terminal (gate), an output terminal (anode) and a terminal common to both input and output (cathode).
		It generally operates as an AC switch for lighting and heating control.
	www.auditmypc.com /acronym/SCR.asp (404 words)

	Silicon-controlled rectifier - Wikipedia, the free encyclopedia
		The name "silicon controlled rectifier" is a trade name for the type of thyristor commercialized at General Electric in 1957.
		SCRs can also be triggered by increasing the forward voltage beyond their rated breakdown voltage, but again, this does not rapidly switch the entire device into conduction and so may be harmful so this mode of operation is also usually avoided.
		SCRs can also be found in welding power supplies where they are used to maintain a constant output current or voltage.
	en.wikipedia.org /wiki/Silicon_controlled_rectifier (576 words)

	Bipolar Junction Transistors
		Silicon BJTs dominate the power device market, in part because of the low cost of large area silicon devices and the high thermal conductivity of silicon compared to GaAs.
		The silicon-controlled rectifier is 4-layer device with alternating n-type and p-type layers as shown in Figure 5.9.2.
		The Thyristor is controlled by the gate electrode, which is the gate of Q1.
	ece-www.colorado.edu /~bart/book/book/chapter5/ch5_9.htm (1430 words)

	An SCR (silicon controlled rectifier is nothing more than a rectifying switch
		The smoothest possible control with a normal ac supply is phase-angle firing whereby switching occurs every half cycle as in the normal lamp dimmer switch.
		For silicon carbide heaters others that have temperature and age dependent resistance, various combinations of current, voltage and power limiting techniques are used.
		One derivative of these for example is maintenance of a constant relationship between controller signal and heater power, in the face of line voltage variation and resistance changes due to temperature and aging.
	www.eurotherm.com /training/tutorial/instrumentation/holland/scr.htm (1051 words)

	Silicon Controlled Rectifier Testing
		The SCR specification that determines whether or not it can be tested is the gate trigger voltage or current.
		An SCR that is being triggered by the tester and switching properly will show one position as a good PNP transistor and one as a good NPN transistor.
		If the replacement SCR does not test, the trigger characteristics are beyond the test signal levels supplied by the tester.
	www.tpub.com /celec/49.htm (779 words)

	SCR : Silicon Controlled Rectifier : Scrim : Shutter : Shutter Cut : Side Light : SMPTE : Soft Patch : Solo : Span Set ...
		An SCR is essentially an electronic switch which achieves the affect of dimming by turning an electrical circuit on and off rapidly over a specific time interval.
		Generally multiple dimmers can be patched to single control channels, but a dimmer can not be patched to more than one control channel.
		As a greater variety of other types of devices are attached to systems primarily designed to control only dimmers, the relationship of control channels to dimmers becomes increasingly abstract.
	www.innovateshowcontrols.com /glossarys6-scr-spider.php (485 words)

	Silicon controled Rectifier (SCR) Electronic Circuits
		SCR Voltage Regulator: Though not as accurate as a linear or a high-frequency switching regulator, an SCR voltage regulator wastes little power and creates no RFI.
		Silicon Controlled Rectifier Model Railroad Throttles and London Model Railroad Group SCR Throttle: The following is a schematic drawing of a Silicon Controlled Rectifier type throttle for use on larger scale model railroads.
		Thermostat for 1KW Space Heater (SCR controlled): Here is a simple thermostat circuit that can be used to control a relay and supply power to a small space heater through the relay contacts.
	www.discovercircuits.com /S/scr.htm (613 words)

	Silicon Controlled Rectifier - HvWiki
		This means that the while the SCR is triggered at the gate by the driver device, the power that keeps current flowing is provided by the power device.
		This also means that once the SCR is triggered, current does not stop after the trigger current stops.
		They negative end of the SCR is wired to one of these two leads, thus making the three contacts.
	wiki.4hv.org /index.php/Silicon_Controlled_Rectifier (428 words)

	Crown Battery Manufacturing Company :: PowerHouse By Crown Battery : SCR
		The advanced design of the PowerHouse SCR charger provides a very tightly controlled voltage level during the critical gassing phase of recharge, allowing for both flooded and sealed maintenance-free lead acid batteries to be charged safely.
		All PowerHouse SCR Chargers are rated to fully recharge a 100% discharged battery in eight hours or less.
		All of the components are easily accessible from the front of the charger and the chargers all have a low center of gravity for safe handling and stacking.
	www.crownbattery.com /en/powerhouse/scr.html (373 words)

	Silicon Controlled Rectifier (SCR)
		The SILICON CONTROLLED RECTIFIER, usually referred to as an SCR, is one of the family of semiconductors that includes transistors and diodes.
		A drawing of an SCR and its schematic representation is shown in views A and B of figure 3-17.
		Consider the SCR as a transistor pair, one PNP and the other NPN, connected as shown in views B and C. The anode is attached to the upper P-layer; the cathode, C, is part of the lower N-layer; and the gate terminal, G, goes to the P-layer of the NPN triode.
	www.tpub.com /neets/book7/26c.htm (432 words)

	Lessons In Electric Circuits -- Volume III (Semiconductors) - Chapter 7
		Relaxation oscillators tend to have poor frequency control, not to mention a very non-sinusoidal output, and so they exist mostly as demonstration circuits (as is the case here) or in applications where precise frequency control isn't important.
		SCRs are unidirectional (one-way) current devices, making them useful for controlling DC only.
		When used to control AC power to a load, TRIACs are often accompanied by DIACs connected in series with their gate terminals.
	www.ibiblio.org /obp/electricCircuits/Semi/SEMI_7.html (8251 words)

	Contract manufacturing from Product Resources - Solid State Reversing Rectifier - Providing contract assembly, ... (Site not responding. Last check: 2007-10-21)
		The traditional power supply used for this purpose includes a diode rectifier, a three-phase AC contactor, and four mercury-wetted relays to reverse the polarity of the output current.
		This Reversing Rectifier consists of two silicon controlled rectifier (SCR) three-phase bridges connected in parallel with opposite polarity outputs.
		The circuit requires twelve SCR firing circuits, all isolated from one another by at least 1500 volts.
	www.prodres.com /engprojects/rectifier.html (252 words)

	Rectifier Electronic Circuits
		Method provides self timing for synchronous rectifiers: 05/16/02 EDN Design Ideas / (added 1/05) Synchronous rectifiers are MOSFETs, driven in such a way as to perform a rectifying function.
		OpAmp Rectifier Signals Input State: 07/21/94 EDN-Design Ideas / (added 6/03) The op-amp rectifier in Fig 1 operates from a single supply and provides a logic output and an LED that indicate the state of the input voltage.
		Precision Rectifier is Glitch Free to 1 MHz: 05/12/94 EDN-Design Ideas / (Electronic Circuit diagram added 03/03) The manufacturer’s circuit for a precision, current-mode, full-wave rectifier (Fig 1a) converts a voltage signal to a current, eliminating errors arising from voltage drops across the rectifying diodes.
	www.discovercircuits.com /R/rectifier2.htm (858 words)

	AGRISCIENCE EXERCISE
		Momentarily closing the NO switch should place the SCR in the conducting mode and cause the lamp to glow.
		Disconnect the conductor attached to the 'gate' terminal of the SCR.
		Develop a hypothesis about the operation of a silicon controlled rectifier based on your experience with and observations of this circuit.
	www.uark.edu /depts/aeedhp/agscience/SCR.htm (309 words)

	The Silicon Controlled Rectifier
		This circuit, as shown in the schematic diagram to the right, uses two SCRs cross-connected with each other (each gate connected to the other SCR's anode) and triggered from the regular brake lights on either side of the rear of the vehicle.
		If only one SCR is triggered (as when you use a turn signal), the triggered SCR gets no anode voltage from the opposite brake light, so the "cyclops" light remains off.
		Triggering the SCR causes the circuit to contiuously draw current through the telephone wires, thus causing the switching station to assume a phone is still in use.
	www.play-hookey.com /semiconductors/scr.html (651 words)

	High voltage tolerant and low voltage triggering floating-well silicon controlled rectifier on silicon-on-insulator for ... (Site not responding. Last check: 2007-10-21)
		High voltage tolerant and low voltage triggering floating-well silicon controlled rectifier on silicon-on-insulator for input or output
		The method comprises providing a SOI substrate comprising a silicon layer overlying a buried oxide layer.
		The silicon layer further comprises a first well of a first type and a second well of a second type.
	www.patentstorm.us /patents/6737682.html (387 words)

	International Rectifier - 25TTS12S - Allied Electronics (Site not responding. Last check: 2007-10-21)
		RECTIFIER, PHASE CONTROL; TO-220AC; 1200V; 1200V; 350A ITSM; 25A; 1.25V; 1.1; 4
		The 25TTSS IR series of silicon controlled rectifiers are specifically designed for medium power switching and phase control applications.
		Typical applications are in input rectification (soft start) and these products are designed to be used with International Rectifier input diodes, switches and output rectifiers which are available in identical package outlines.
	www.alliedelec.com /Search/ProductDetail.asp?SKU=273-0075 (103 words)

	Lab-Volt: Training Systems -- Thyristors and Power Control Circuits (91011)
		The Thyristor and Power Control Circuits Course provides comprehensive, hands-on instruction in the fundamental terminology, principles, and applications of thyristor and power control circuits.
		To permit the examination and testing of thyristor and power control circuit blocks, the student uses two-post connectors to quickly configure each function.
		The Circuit Board is a multi-layer, G-10, glass-epoxy PC board with 2-ounce copper and has a fl matte coating to enhance readability of circuit diagrams that appear in white.
	www.labvolt.com /product_print.asp?id=116 (415 words)

	The Silicon Controlled Switch
		The basic construction of the SCS is the same as for the SCR, with the addition of a second gate lead.
		The equivalent circuit is the same as shown to the right, and even the schematic symbol of the SCS is similar to the SCR symbol.
		First, because both gate regions are accessible, they can be biased so as to completely cancel the rate effect we described with the four-layer diode.
	www.play-hookey.com /semiconductors/scs.html (214 words)

	INDUCTION HEATER APPARATUS AND SYSTEM (US3845268) (Site not responding. Last check: 2007-10-21)
		An ultrasonic frequency generator circuit utilizing a single SCR and having a maximum power output of about 1 kilowatt includes in circuit therewith a coupling coil for providing directly a high concentrated magnetic field which induces eddy currents in the electrically conductive article for rapid heating.
		a first series circuit path coupled between said first (603) and second (691) input terminals, said first series circuit path comprising a silicon controlled rectifier (601), second capacitance means (983, 984) and a primary coil (30) of an air core transformer;
		a third series circuit path coupled across said silicon controlled rectifier (601), said third series path comprising a first resistance means (650) and third capacitance means (989); and
	www.delphion.com /details?pn10=US03845268 (365 words)

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