FR2465359A1 - Series transformers electronic switch - uses digital circuits driving triacs to energise transformers used to regulate line voltage in discharge lamp supplies - Google Patents

Abstract

Voltage regulation of a line feeding discharge type lamps is obtained by placing transformers in the line feeding the lamps and energising one or more of the transformers to boost the voltage to levels manually set (3) in a nominated sequence which is controlled by a multi-contact clock (4). The set data is passed to a binary comparator (5) whose other input is from a shift register (7) with up-down shift controlled by a J-K flip-flop (8) switched by the binary comparator (5) output. A zero crossing circuit (11) controls the J-K flip flop (8) so the output triacs (14) which energise the appropriate transformer primary do not generate radio frequency interference.

Description

The present invention relates to an electronic variator controlling changers, state ts on one or more transformers.

This electro-variator is intended to supply the primers of @ transformers including the secondai @@@ son @ @@ series on an electric line, this dam. '. the goal of -eai.ra to vary eli more or less a tension or a power or in order to stabilize a tension or a power.

The scale of variation is Lompris between a nominal value and a series of several voltages in more or less that without breaking the fundamental.

The realizations are possible in single phase or in polyphase.

More precisely, the electronic variator which is the subject of the present invention is notably remarkable in that it notably comprises a binary comparator on which the consoles are sent via a gate logic and a register. shifted.

Other advantages and characteristics will emerge more clearly on reading the description which will follow made with reference to the figures given at t: 'rre in @ icative and in no way limitative among which
Figure ï shows an example of using the drive
electronics according to the present invention in single phase, Figure 2
represents an example of use of the electronic variator according to
the present invention in polyphase, FIG. 3 is a diagram
block diagram representing the electronic part of the drive, the
Figure 4 illustrates the various constituents making up certain
assemblies forming the electronic variator, and FIG. 5
illustrates the different constituents making up another part
assemblies forming said electronic variator.

Figures 1 and 2 illustrate the mounting of the electronic dimmer 1 respectively in single-phase or in polyphase, the installation being provided for example in the field of public lighting for the supply of discharge lamps 2 including the equipment (self e ; capacity) has not been illustrated.

These Figures 1 and 2 represent three variation transformers T1,
T2, T but it is understood that the number of said transformers may be greater than or less than three.

The following figures schematically illustrate the electronic part of the drive 1; reference being made to FIG. 3, it will first be noted that this variator comprises a part 3 of the variator giving the operating limits (set points), this by two potentiometers with adjustable studs which allows a first manual power program.

A series of set points located in a part 4 external to the potentiometers allows a program by clock with multicontact or any other system.

These instructions are transmitted to a binary comparator system 5 via a gate logic 6 on the one hand, and a shift register 7 with integrated circuits on the other hand.

This shift register 7 is shifted to the left or to the right by means of JK or other type flip-flops 8 informed by the outputs of the comparator 5.

This ultimately results in the blocking or saturation of the triacs controlling the use circuits (powering the primaries of the transformers T1, T2, T3).

The double RC 9 oscillator sends pulse trains to the triggers of the triacs through intensity transformers.

The information is routed in the meantime by a set of logic gates 10.

To avoid switching the triacs under load and in order not to have a set of HF interference generators, the switching operations are carried out at the O of the sinusoid by means of an operational amplifier and a monostable integrated circuit 11.

An update circuit 12 repositioning the shift registers 7 in the initial position in the event of a mid-cut.

The continuous supply of the assembly is ensured by an integrated voltage regulator 13.

Several identical power circuits 14 (for example 14a, 14b, 14c) with their trigger commands ensure the passage of the network voltage in two opposite directions according to the orders received.

These output systems are protected by an RC 15 circuit against inadvertent commands.

Reference will be made to FIGS. 4 and 5 to see which are the various constituents forming the variator shown diagrammatically in FIG. 3.

It is understood that without departing from the scope of the present invention, those skilled in the art can replace some of these constituents with other equivalents.

Claims (5)

Claims 1. Electronic variator controlling changes of state on one or more transformers, characterized in that it comprises in particular a binary comparator on which the instructions are sent by means of a gate logic and a shift register . 2. Variator according to claim 1, characterized in that the setpoints come from two potentiometers with adjustable studs. 3. Variator according to claim 1, characterized in that the setpoints come from a program by clock with multicontact. 4. Variator according to claim 1, characterized in that said shift register is shifted to the right or to the left by flip-flops informed by the outputs of said comparator. 5. A variator according to claim 4, characterized in that said shift register is repositioned in the initial position using a updating circuit.