Showing papers on "Precision rectifier published in 1981"
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TL;DR: A preferred mode of operating a parallel connected HVDC transmission system would be with at least one of the major rectifier stations in voltage control as mentioned in this paper, which could be realized using diode rectifier units.
Abstract: A preferred mode of operating a parallel connected HVDC transmission system would be with at least one of the major rectifier stations in voltage control. Such a station could be realized using diode rectifier units.
34 citations
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20 Feb 1981TL;DR: In this article, an automatic gain control circuit, a peak detector and a feedback path from the peak detector circuit to the input circuit of the automatic gain controller are used to discriminate between two values of a signal using offset compensation.
Abstract: A device for discriminating between two values of a signal using DC offset compensation including an automatic gain control circuit, a peak detector circuit and a feedback path from the peak detector circuit to the input circuit of the automatic gain control circuit. The value of the feedback current is regulated so that the maximum value of one of the same polarity signals and the opposite polarity signal coincides with the minimum value of the other of the two signals.
26 citations
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02 Feb 1981TL;DR: In this paper, a half-wave and a full-wave rectifier using transistors as rectifying elements have independently controlled multiple output voltages obtained from a single power supply, and the transistor used as a rectifying element has its turn-on controlled thus allowing voltage control by phase control action.
Abstract: A half-wave and a full-wave rectifier using transistors as rectifying elements have independently controlled multiple output voltages obtained from a single power supply. The transistor used as a rectifying element has its turn-on controlled thus allowing voltage control by phase control action.
19 citations
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26 Mar 1981
TL;DR: In this paper, an improved current mode operational rectifier with loop transmissions through both feedback paths of an operational amplifier stage which limit at unity gain is presented. And an improved bias generator which can be used to bias the operational rectifiers is also disclosed.
Abstract: An improved current mode operational rectifier having loop transmissions through both feedback paths of an operational amplifier stage which limit at unity gain. An improved bias generator which can be used to bias the operational rectifier is also disclosed.
12 citations
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09 Apr 1981
TL;DR: In this paper, the IR drop free potential of a cathodically protected structure is measured using a shunt transistor, which is periodically pulsed on to shunt or electrically connect the output lines of a rectifier to force the voltage and current delivered to a structure being cathodic protected to zero.
Abstract: An electronic circuit for measuring the IR drop free potential of a cathodically protected structure includes a shunting transistor which is periodically pulsed on to shunt or electrically connect the output lines of a rectifier to force the voltage and current delivered to a structure being cathodically protected to zero. The reference cell potential is measured during this zero or sampling time and a minimum value detected by a detector circuit which holds the value until changed in successive sampling periods. The minimum reference cell potential is then compared to a voltage corresponding to a desired reference cell potential and the difference used to generate a firing voltage for SCRs in the rectifier and thereby control its output to achieve the desired level of cathodic protection.
11 citations
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16 Jun 1981
TL;DR: In this article, a low-noise pulse conditioner is provided for driving electronic digital processing circuitry directly from differentially induced input pulses using a unique differential-to-peak detector circuit to generate a dynamic reference signal proportional to the input peak voltage.
Abstract: A low-noise pulse conditioner is provided for driving electronic digital processing circuitry directly from differentially induced input pulses. The circuit uses a unique differential-to-peak detector circuit to generate a dynamic reference signal proportional to the input peak voltage. The input pulses are compared with the reference signal in an input network which operates in full differential mode with only a passive input filter. This reduces the introduction of circuit-induced noise, or jitter, generated in ground referenced input elements normally used in pulse conditioning circuits, especially speed transducer processing circuits.
10 citations
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10 Jul 1981
TL;DR: In this paper, a circuit consisting of a rectifier, such as a diode, in series with the batteries and biased to conduct a first half cycle charging current from the AC source and a signal emitting and rectifying device, such a light emitting diode (LED), biased opposite from the rectifier to conduct the opposite half cycle of current and adapted to emit a signal when conducting to indicate the charging process.
Abstract: A circuit provides a half-wave rectified current for charging batteries from an AC source. The circuit comprises a rectifier, such as a diode, in series with the batteries and biased to conduct a first half cycle charging current from the AC source and a signal emitting and rectifying device, such as a light emitting diode (LED), biased oppositely from said rectifier, to conduct the opposite half cycle of current and adapted to emit a signal when conducting to indicate the charging process.
10 citations
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TL;DR: In this article, a thermally switched 9 kA full wave rectifier-fluxpump is presented, which consists of a current step up transformer, two reliable thermally activated switches and a dummy load inductor.
Abstract: The feasibility of superconducting rectifier-fluxpumps has to be demonstrated at current levels of 10 - 100 kA, where is asked for in the superconducting devices now being planned. An intensive program has been started at the low temperature division of the University of Twente to construct such high current rectifiers. A thermally switched 9 kA full wave rectifier-fluxpump will be presented. The s.c. rectifier consists of a current step up transformer, two reliable thermally activated switches and a dummy load inductor. Both, load coil and rectifier are fully protected against failure modes. The rectifier is now (March, 1981) under test and has energized yet the load coil to a level of 4.5 kJ at 9 kA within 150 seconds, frequency 0.11 Hz, mean power 30 W, the efficiency of the energy conversion is 99,1%.
10 citations
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28 Oct 1981TL;DR: In this paper, a rectifier circuit consisting of a pair of rectifiers (88, 86, 90, 92, 93, 94, 95, 96, 97, 98, 99, 100, 104, 105, 106, and 106, respectively) with substantially identical nonlinear transfer characteristics with the first one of the rectifiers receiving the differentially applied input signal at first and second (82, 84) inputs.
Abstract: A rectifier circuit (80) which produces a nearly perfect full wave rectified output signal in response to receiving a differentially applied input signal. The rectifier circuit comprises a pair of rectifiers (88, 86, 90, 92 and 102, 104, 106, respectively) that have substantially identical non-linear transfer characteristics with the first one of the rectifiers receiving the differentially applied input signal at first and second (82, 84) inputs. A current mirror (96) having an input coupled at a first node (94) to an output of the first rectifier provides an output signal at an output thereof which is substantially identical to the output signal appearing at the output of the first rectifier. The second rectifier has an output connected at a second node (98) to the output of the current mirror. A feedback circuit (100, 108) is coupled between the second node and an input of the second rectifier to cause the output signal appearing at the output of the second rectifier to be a full wave rectified version of the differentially applied input signal. The rectifier circuit is suitable for use in video detector systems.
10 citations
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09 Jul 1981TL;DR: In this article, a spark generator includes a spark transformer 16, an energy storage capacitor 20 connected across an AC supply from terminals, and an SCR (25) connected across the transformer capacitor circuit for discharging the capacitor and generating a spark.
Abstract: The spark generator (10) includes a spark transformer 16, an energy storage capacitor 20 connected across an AC supply from terminals (11, 12), and an SCR (25) connected across the transformer capacitor circuit for discharging the capacitor and generating a spark (at 18). The transformer capacitor circuit is connected to the AC supply in series with diode circuit 31 through which the capacitor is charged to the peak voltage of the AC supply and the diode circuit is shunted by an SCR firing control circuit (21, 33, 28) through which current flows when the voltage across the diode circuit reverses to fire the SCR during the same half cycle as the capacitor is charged in.
9 citations
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30 Sep 1981
TL;DR: An automatic power reduction circuit with a single silicon controlled rectifier in one leg of a bridge rectifier which is gated off when a capacitor reaches a predetermined voltage level so as to switch automatically the bridge output from a full wave rectifier to a half-wave rectifier is described in this paper.
Abstract: An automatic power reduction circuit having a single silicon controlled rectifier in one leg of a bridge rectifier which is gated off when a capacitor reaches a predetermined voltage level so as to switch automatically the bridge output from a full-wave rectifier to a half-wave rectifier. An auxiliary silicon controlled rectifier is also provided to facilitate the quick discharge of the capacitor so as to reset the circuit to its initial state, thereby allowing fast, repeated operations and preventing malfunctioning upon a loss of power.
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02 Oct 1981TL;DR: In this paper, an alternating current power source apparatus consisting of an AC generator having a field coil which is driven by an engine, a first rectifier having one or more thyristors which rectify the AC output of the AC generator, an AC driving load connected to said first and second rectifiers, a voltage control device for controlling the output voltage of said generator to a predetermined value by controlling a field current passing through said field coil; an oscillator for oscillating at a desired frequency; and a gate signal generating circuit which is controlled by the output of said oscillator so
Abstract: An alternating current power source apparatus comprises an AC generator having a field coil which is driven by an engine; a first rectifier having one or more thyristors which rectify the AC output of the AC generator; a second rectifier having one or more thyristors which is connected in parallel to said first rectifier to give the output having a polarity reverse to the polarity of the output of said first rectifier; an AC driving load connected to said first and second rectifiers; a voltage control device for controlling the output voltage of said generator to a predetermined value by controlling a field current passing through said field coil; an oscillator for oscillating at a desired frequency; and a gate signal generating circuit which is controlled by the output of said oscillator so as to feed a turn-on signal alternately to said gate circuit of said first rectifier and said gate circuit of said second rectifier.
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14 May 1981TL;DR: In this paper, an on-off voltage regulator operates a set of power MOSFET switches interposed between the grounded terminal of the battery and each of the diodes of a bridge rectifier leading to that terminal.
Abstract: A conventional on-off voltage regulator operates a set of power MOSFET switches interposed between the grounded terminal of the battery and each of the diodes of a bridge rectifier leading to that terminal. Each such switch is controlled through an individual circuit responsive to the regulator output and including an opto-electronic device controlling a thryistor which, in addition to being connected to control the MOSFET switch, also has a connection through a resistor and a diode to the other side of the rectifier diode switched by the MOSFET. The circuit greatly simplifies voltage regulation of a battery charging system using an alternator with a permanent magnet rotor.
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01 Jun 1981TL;DR: In this article, the AFT detector is disabled to avoid an AFT "lockout" condition, when the comparison indicates the IF output swing exceeds a threshold value, and the detector is replaced with a peak detector independent of the synchronous video detector and the automatic gain control system.
Abstract: Television receiver employs a synchronous video detector system, and includes an AFT detector responsive to carrier waves supplied by reference amplifier of synchronous detector system. A peak detector, independent of the synchronous video detector and the receiver's automatic gain control system, is responsive to the output of the receiver's IF amplifier, and supplies an output to a voltage comparator. When the comparison indicates the IF output swing exceeds a threshold value, the AFT detector is disabled to avoid an AFT "lockout" condition.
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23 Dec 1981TL;DR: In this article, an automatic device for compensating the electrical mains voltage variations (2) polyphase alternating, applied to an AC-DC converter, is described in that it comprises means (5) for determining the voltage variations at the input of each rectifier.
Abstract: The invention relates to an automatic device for compensating the electrical mains voltage variations (2) polyphase alternating, applied to an AC-DC converter (3). This device is characterized in that it comprises means (5) for determining the voltage variations at the input of each rectifier (Th ,, Th Application to electrical sources of continuous power, particularly for data processing systems.
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27 Oct 1981
TL;DR: In this paper, a two-channel ungrounded transmission line is considered, where one channel is operative in response to a binary "1" and the other is inactive, and each channel receives high frequency oscillations through a transformer.
Abstract: Digital signals are applied to an ungrounded transmission line through a two channel system, one channel being operative in response to a binary "1" the other in response to a binary "0." Each channel, when active, receives high frequency oscillations through a transformer. One side of the transformer is connected to the emitter-collector circuit of a transistor constituting a main rectifier. A buffer transistor has an emitter-collector circuit connected in series with the main rectifier transistor. A rectifier diode connected to the secondary winding of the transformer furnishes a DC signal to switch the buffer transistor to the conductive state only when high frequency oscillations appear across the secondary winding, that is when the channel is active. A high frequency filter between the main rectifier transistor and the buffer transistor prevents high frequency oscillations from reaching the output.
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16 Oct 1981
TL;DR: In this paper, the authors proposed to make the device compact by substituting the differential or differential circuit of the signal detecting circuit of one-dimensional solid-state image sensing elements with two sample holding circuits, a differential amplifier and an absolute value circuit.
Abstract: PURPOSE:To make the device compact by substituting the differential or differential circuit of the signal detecting circuit of one-dimensional solid-state image sensing elements with two sample holding circuits, a differential amplifier and an absolute value circuit. CONSTITUTION:One-dimensional solid-state image sensing elements 13 such as CCDs are disposed on the image plane of the image 2 by an image lens 1, and are driven by a driving circuit 5 in synchronization with the clock of a pixel clock generator 4, the time series electric signal whereof is inputted to sample holding circuits 6, 7. The sample holding circuits 6, 7 send the signal alternately to a differential amplifier by way of a frequency bisecting circuit 8 by the clock signal from the circuit 4. The differential signal thereof is sent to a microcomputer 13 via an absolute value circuit 10, a peak detector 11, and an AD converter 12. The control signal is sent to a step motor controller 14 in the direction where the peak value is maximum, and focusing is accomplished by way of a step motor 15 and a rack pinion mechanism 16. Thereby, the device is made compact.
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01 May 1981TL;DR: In this article, a conventional on-off voltage regulator responsive to the output voltage of the rectifier of a vehicular battery charging system, operates three circuits each containing a pulse transformer and its driving transistor and other components for controlling the three SCRs that provide the negative side of the Rectifier bridge, so that they will either pass entire halfwaves or block completely.
Abstract: A conventional on-off voltage regulator responsive to the output voltage of the rectifier of a vehicular battery charging system, operates three circuits each containing a pulse transformer and its driving transistor and other components for controlling the three SCRs that provide the negative side of the rectifier bridge, so that they will either pass entire halfwaves or block completely. The other three rectifier elements of the bridge are ordinary diodes. With this arrangement the SCRs may have the same rating as the other diodes of the bridge, and the thermal load is evenly distributed, while an alternator having a permanent magnet field can be used.
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02 Jan 1981
TL;DR: In this article, an apparatus for processing video signals received from an optical scanner is described, where a comparator means is used for comparing the video signals with a dynamic threshold voltage.
Abstract: An apparatus for processing video signals received from an optical scanner is described. A comparator means is used for comparing the video signals with a dynamic threshold voltage. This threshold voltage is generated by a peak detector circuit which also receives the video signals. The peak detector circuit includes decay means for decaying signals representative of the detected peaks at a predetermined rate. This thresholding technique provides compensation for a wide dynamic range of video signals received from a photodiode array.
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12 May 1981TL;DR: In this paper, a switchable signal compressor/signal expander is used to produce a D.C. reference voltage, and the output of the control amplifier is maintained at a level approximate to the reference voltage.
Abstract: Either an input signal of a combining network or an output signal of an inverter arranged on a main path is fed to a side path through a mode switch in a switchable signal compressor/signal expander. Since an input terminal of a control amplifier is connected to a variable filter without passing through a signal amplifier, the deviation of the detection characteristic of a rectifier and integrator attributed to D.C. offset voltages of the signal amplifier and the control amplifier can be reduced. On the other hand, a switchable signal compressor/signal expander in another aspect of performance has a reference voltage generator for producing a D.C. reference voltage, and the output D.C. level of the control amplifier is maintained at a level approximate to the D.C. reference voltage. The other ends of first and second capacitors of the rectifier and integrator are also supplied with the D.C. reference voltage, so that the fluctuation of the detection characteristic of the rectifier and integrator ascribable to the fluctuation of the D.C. reference voltage is reduced.
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27 Mar 1981TL;DR: In this article, a signal regenerator for digital signals having an equaliser amplifier (EV) which includes a variable equaliser (Ev) controlled by a regulating amplifier (Vr), and having a time regenerator (ZR) and a clock pulse extractor (TR) is described.
Abstract: 1. A signal regenerator for digital signals having an equaliser amplifier (EV) which includes a variable equaliser (Ev) controlled by a regulating amplifier (Vr), and having a time regenerator (ZR) and a clock pulse extractor (TR) which includes a rectifier circuit (G) and which at the input end is connected to an output of the equaliser amplifier (EV) and at the output end to an inout of the time regenerator (ZR), characterised in that at the input end, a peak value rectifier (R, D, CL ) leading to the control input of the regulating amplifier (Vr) is connected to the one main electrode (c) of a rectifier transistor (T) which has its other main electrode (e) arranged in the output branch (g) of the rectifier circuit (G) included in the clock pulse extractor (TR), and the control electrode (b) of which rectifier transistor (T) is connected to the output (k) of the equaliser amplifier (EV).
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08 Oct 1981
TL;DR: The two-way rectifier circuit as mentioned in this paper is used for precision rectification of alternating voltages, and it is designed as an integrated circuit with a controllable conversion characteristic.
Abstract: The two-way rectifier circuit, is used for precision rectification of alternating voltages. It is designed as an integrated circuit with a controllable conversion characteristic. The input and the output potentials can be adjusted. The circuit contains two difference amplifier (1,2) with a high output resistance each linked to the load via a half-wave rectifier (16,26). One of the two difference amplifiers has a controllable gain. The non-inverting input of the first amplifier is connected to the inverting input of the second amplifier and vice-versa. The difference amplifiers are formed by two push-pull transistors with common emitter circuits.
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30 Dec 1981
TL;DR: In this paper, a rectifier forward-biases the bilateral current gate when a controllable switching element forms a return path from the bilateral gate to the rectifier, so that the signal to be switched is modulated onto the bias current from the rectifiers.
Abstract: A bilateral, low loss, wide band, switching circuit controls the transfer of a signal between two terminals. The balance points of a bilateral current gate connect to the terminals. A rectifier forward-biases the bilateral current gate when a controllable switching element forms a return path from the bilateral current gate to the rectifier. When the rectifier is energized, control circuitry closes the conductive path through the switching element to forward-bias diodes in the bilateral current gate so it operates as a modulator in which the signal to be switched is modulated onto the bias current from the rectifier.
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02 Apr 1981
TL;DR: Inverted current rectifier with self commutation for smaller and medium output and three-stage commutation in which the disconnection of thyristors of the inverted rectifier and the current commutations in the phases are separated as discussed by the authors.
Abstract: Inverted current rectifier with self commutation for smaller and medium output and three-stage commutation in which the disconnection of thyristors of the inverted rectifier and the current commutation in the phases are separated and the accumulated power of capacitors of the inverted rectifier is, without losses, discharged to the current source and thus to the load of the inverted rectifier.
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19 Jun 1981
TL;DR: In this paper, the rectifier module comprises diodes and a heat-sink and is connected to the 3-phase generator of the vehicle by means of a Zener diode.
Abstract: The rectifier module comprises diodes and a heat-sink and is connected to the 3-phase generator of the vehicle. The diodes form a column and are fitted into appropriate recesses in the heat-sink. The column also contains a Zener diode (16), which is connected between the output terminals (18,22) of the rectifier diodes (14,15) and is reversed biased when the diodes are functioning correctly. The Zener diode's break-over voltage lies above the output voltage of the rectifier diodes. The contact of one diode (14) and the corresp. contact of the Zener diode are connected directly and conductively to the heat-sink (18).
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08 Jan 1981
TL;DR: In this article, an operational amplifier circuit is used for the regeneration of digital signals read from magnetic tape, where the output of the pick up is amplified and processed through a phase compensator before transmission to the regeneration circuit as a voltage signal (V2).
Abstract: An operational amplifier circuit is used for the regeneration of digital signals read from magnetic tape. The output of the pick up is amplified and processed through a phase compensator before transmission to the regeneration circuit as a voltage signal (V2). The first operational amplifier stage (V1) is coupled as a peak detector to generate peaks at the leading and trailing edges of the square wave input and providing an output voltage (UP). The final operational amplifier stage (V2) subtracts the input from the generated signal to provide a regenerated output.
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18 Nov 1981
TL;DR: In this article, an AD converter suitable for the radiant-ray measurement was used to measure radiant rays effectively by setting a voltage in switching lower than the circuit voltage when a signal pulse is at 0V.
Abstract: PURPOSE:To measure radiant rays effectively by setting a voltage in switching lower than the circuit voltage when a signal pulse is at 0V, in an AD converter suitable for the radiant-ray measurement CONSTITUTION:An input signal is led to linear gate 12 via input buffer 11 and the output of the gate is further inputted to synchronizer 19 by way of stretcher 13, peak detector 14 and clock gate 15 The other output of stretcher 13 is led via high speed/low speed change-over switch level detector 18 to synchronizer 19, whose outputs are supplied to channel scaler 20 to adjust the gain via conversion gain switch 21 Then, a digital value equivalent to an offset voltage is subtracted out of scaler 20 Thus, invariably excellent linearity is obtained without reference to the level of the voltage of the signal pulse, and the radiant-ray measurement is carried out effectively
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09 Jun 1981TL;DR: In this article, a peak detector utilizes a differential amplifier operating in conjunction with a peak signal voltage detecting circuit connected therewith as a negative DC feedback network to detect the relative amplitudes of consecutive signal voltage peaks.
Abstract: In a circuit breaker static trip unit, a peak detector generates a DC current signal of a magnitude proportional to the rectified peak signal voltage developed across a current transformer burden resistor. The peak detector utilizes a differential amplifier operating in conjunction with a peak signal voltage detecting circuit connected therewith as a negative DC feedback network. A recovery circuit detects the relative amplitudes of consecutive signal voltage peaks pursuant to rapidly adjusting the peak signal voltage detecting circuit to signal voltage peaks of decreasing amplitudes.
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21 Nov 1981
TL;DR: In this article, a mixer is used to convert the RF signal to an AF signal corresponding to the RF signal, and an AF rectifier is provided which converts the AF signal into a DC signal.
Abstract: In a radio-frequency rectifier, a mixer is provided which converts the RF signal to be rectified into an AF signal corresponding to the RF signal. Furthermore, an AF rectifier is provided which converts the AF signal into a DC signal.
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24 Dec 1981
TL;DR: In this article, the ignition circuit has a rectifier bridge (10) supplied with an ac voltage and charging a capacitor (GL) with a dc voltage via a charging resistor (RL), which produces the turn-on signal for the triac that connects the primary winding (18) of the ignition transformer (20) across the capacitor.
Abstract: The ignition circuit has a rectifier bridge (10) supplied with an ac voltage and charging a capacitor (GL) with a dc voltage via a charging resistor (RL). A control circuit, comprising a second resistor (RZ) and a diode (30), produces the turn-on signal for the triac (22) that connects the primary winding (18) of the ignition transformer (20) across the capacitor. Sparking electrodes (28) are connected to the secondary winding. The control circuit shunts the capacitor and the junction between its resistor and diode is connected to the gate of the triac. An interference-suppression capacitor (36) shunts the charging resistor and the rectifier's dc output.