Showing papers on "Voltage multiplier published in 1970"

Electrostatic spray gun with self-contained miniaturized power pack integral therewith

Abstract: An electrostatic spray gun having physically integral therewith a power pack for transforming low voltage supplied to the gun to high voltage for application to the gun electrode. The power pack is contained completely within the gun, and includes a combined oscillator and transformer which converts low voltage d.c., e.g., 11 volts, supplied to the gun via a low voltage cable to an intermediate voltage at high frequency, e.g., 6,000 volts peakto-peak at 45 KHz; and a voltage multiplier circuit which transforms the high frequency 6,000 volt peak-to-peak power to 72,000 volts d.c. for application to the gun electrode.

Dual voltage power system for use with vehicle alternators and the like

Abstract: There is disclosed herein a dual voltage power unit for use in automobiles, campers, and the like for normally supplying the relatively low DC voltage from an alternator to a storage battery and other electrical devices of the vehicle and for supplying a higher voltage, such as 115 volts, for external usage such as for lighting, emergency power, and so forth. Several circuits are disclosed herein for providing a dual output DC voltage, or for providing a low DC voltage and a higher AC voltage at 60 hertz. The system includes a rectifier circuit coupled with the output of an alternator for normally providing the usual automotive DC voltage, such as 14.5 volts. A load sensor and control circuit are provided for sensing the demand for the higher voltage and for controlling rectifier circuits to supply the same.

Controlled voltage multiplier providing pulse output

Abstract: A voltage multiplier comprising a pair of input terminals adapted for connection to a source of voltage to be multiplied and a plurality of circuit branches connected in parallel with the terminals, each of the branches including a capacitor and resistance means for developing a voltage on the branch. A pair of output terminals adapted to be connected to a load are connected in series with one of the capacitors whereby the path of current charging that capacitor is through the load. A corresponding plurality of controlled switches such as transistors are connected to corresponding ones of the capacitors, and the switches and capacitors are connected together to define a series discharge path including the pair of output terminals when the switches are operated by trigger means in the form of a pulse generator connected to the control terminal of each of the switches. The voltage multiplier can be provided with regulating means in the form of a potentiometer connected to the output terminals and in controlling relation to a transistor switch for disconnecting the trigger means when the voltage on the output terminals reaches a predetermined magnitude.

Heat-sensing circuit

Abstract: An analog voltage multiplier in combination with an operational integrator. The overall circuit measures the energy input to an X-ray generator tube and compensates for its thermal dissipation. If safe bounds are exceeded, the tube is shut down. These circuits are independent of the normal control circuits so that the tube and patient are protected.

Automatic voltage regulating system for a dc load

Abstract: For automatic voltage regulation for a DC load, fed from an AC source via a three-terminal thyristor or a silicon-controlled rectifier, a constant-voltage element is connected in parallel to the AC source via a nonvariable resistance, and a capacitor is provided which is charged, via a variable resistance, with a voltage corresponding to a difference between the constant voltage of the aforesaid constant-voltage element and the voltage of the DC load, the voltage of said capacitor being impressed to the control terminals of the three-terminal thyristor, i.e., the gate and cathode terminals of the silicon-controlled rectifier, via a threshold-value element (e.g., a Shockley diode) that becomes conductive when the voltage of the capacitor reaches a predetermined threshold value.

High voltage watch power supply

Abstract: A power supply for a watch including voltage multiplying means or transforming means to increase the voltage of a power cell to a higher voltage capable of operating electrical and electronic devices used in watches requiring voltage higher than the conventional 1.5 volts. These include highly efficient quartz oscillators and dividing units, MOS integrated circuits, solid state indicating systems, crystals, piezoelectrical and electrostatic motors and piezoelectric alarm systems, and associated systems. A DC-AC converter or chopper is connected respectively to a voltage multiplier or transformer and the high voltage output therefrom is suitable for driving various types AC or DC systems used in watches. The use of a plurality of batteries or other undesirable structures is thereby avoided.

Improvements relating to electrical a.c. to d.c. converters

Abstract: 1,214,464 AC/DC static converters ASSOCIATED ELECTRICAL INDUSTRIES Ltd 9 Feb, 1968 [14 Feb, 1967; 26 May, 1967], Nos 7104/67 and 24532/67 Heading H2F An AC/DC converter (voltage multiplier) comprises an even number of similarly-poled capacitor-shunted rectifier stages connected in series between a pair of DC output terminals, and AC input terminals connected to intermediate points on the rectifier stack in such a manner than in operation half of the stages are driven in anti-phase to the other half, at least one of the input terminals being connected to the rectifier stack through a capacitor Thereby the phasing of the ripple of the two halves of the converter are effectively interlaced giving an output ripple which is at twice the supply frequency but is half the amplitude compared with that obtained with an arrangement wherein all the stages are driven in the same phase for instance as illustrated in Fig 5 (not shown) As shown, Fig 6, each stage comprises two similar pairs of series-connected rectifiers each pair shunted by a respective capacitor and one input terminal being connected through C S1 to the stack The lower half of the stack is driven in anti-phase to the upper half Each stage may alternatively comprise a basic unit as shown, Fig 4, wherein the capacitors eg C 1 , C 2 (Fig 6) are replaced by a single capacitor C e Since, assuming C S1 is charged, charging current for C 1 , C 2 via C S1 R 2A and R 1B flows during one half cycle and current to recharge C S1 flows via R 1A and R 2B during the other half cycle, the junction between C 1 C 2 and R 1A R 2B can be omitted as currents flowing in C 1 C 2 and those flowing in R 1A R 2B cannot flow at the same time Polyphase and bi-phase centre-tapped transformer arrangements of the basic circuit of Fig 6 are envisaged as also are series resonant LC circuits in the input phase lines

Improvements relating to electrical rectifying arrangements

Abstract: 1,214,465. Electrical converter systems. ASSOCIATED ELECTRICAL INDUSTRIES Ltd. 9 July, 1968 [12 July, 1967], No. 32020/67. Heading H2F. In a modification of a rectifier arrangement described in Specification 1,130,082, to obtain good regulation of the rectifier voltage output with load, the rectifier is fed via a series resonant circuit and a thyristor switches) (or alternatively discharge tubes or mechanical switches) controlled to connect the supply source (which may be A.C. or D.C.), periodically at a frequency less than the resonant frequency of the series LC circuit. In a voltage multiplier embodiment fed from a sinusoidal A.C. supply (Fig. 8) the thyristors T1, T2 conduct alternately for periods during which there is small variation in voltage amplitude of the supply, e.g. for a period between 18 degrees before and 18 degrees after the peak of each sine wave to approach as close as possible to a square wave input. The LC circuits are tuned to five times the supply frequency and since, for instance, L1C1 is substantially loss free, current to the diode bridge rectifier D1 will charge a reservoir capacitor CL1. When the supply voltage reverses the capacitor CL1 voltage will initially augment the supply voltage and finally oppose it. These initial and final voltages will be equal and opposite so that the output voltage across CL1 will not be affected and good regulation is obtained. Likewise bridge D2 is fed via series resonant circuits L2, C2, L3, C3 and similarly diode bridges D3, D4. Since the reservoir capacitors CL are in series their voltages are additive. In an embodiment, Fig. I (not shown), bridges D2, D3, D4 are omitted, while Figs. 4 and 10 (not shown) illustrate arrangements with three-phase input. In addition split bridge multipliers are described, Figs. 2, 6, 9 (not shown). In a D.C. input embodiment (Fig. 5) thyristors T1, T2 are triggered simultaneously for current flow in one direction while T3, T4 are both triggered for current flow in the other direction. The conduction period for each pair is at least as long as a half-cycle of the resonant circuit tuned frequency. In an embodiment, Fig. 7, thyristor T1 first conducts to feed the rectifier, then T2 is made conductive to short circuit the rectifier and restore the LC circuit to its initial condition. The thyristors may be turned off by auxiliary thyristors and quenching capacitors, in a known manner.

Peak AC Voltage Limitations in Second-Harmonically Tuned IMPATT Diodes (Correspondence)

Abstract: The tuned-harmonic mode of IMPATT-diode oscillation is examined under the restriction of a maximum limit to the peak-to-peak voltage swing It is concluded that if a peak ac voltage limitation is effective in limiting the output power of an lMPATT diode, the maximum output power is achieved under conditions which minimize the harmonic interaction and at an operating frequency equal to the transit-time frequency